JP2003214793A - Heat exchanger, header tank for heat exchanger, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for the CO<SB>2</SB>coolant capable of obtaining the sufficient pressure resistance, while restricting a flow passage resistance of the coolant. <P>SOLUTION: A header tank 10 has a header tank main body 11 and a cover plate 20. The header tank main body 11 has a coolant flow-in passage 12a and a coolant flow-out passage 12b arranged in parallel with each other, connection holes 14a and 14b formed in the inside surface 13 and to be communicated with the flow passages 12a and 12b, and a communication hole 15 for communicating the flow passages 12a and 12b with each other. The cover plate 20 has insertion holes 24a and 24b formed corresponding to the connection holes 14a and 14b. Each end of tubes 1a and 1b is inserted into the insertion holes 24a and 24b of the cover plate 20 arranged on the inside surface 13 of the header tank main body 11, and connected to the connection hole 14a and 14b of the header tank 11 for communication. In this condition, they are joined for unifying. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger such as a condenser or an evaporator in a refrigeration cycle for automobile air conditioners, household air conditioners, refrigerators, electronic device coolers, etc., particularly for a CO ₂ refrigerant refrigeration cycle. TECHNICAL FIELD The present invention relates to a header tank for a exchanger and a manufacturing method thereof.

[0002]

HCFC is used as a refrigerant for air conditioning equipment.
Freon-based refrigerants such as (hydrochlorofluorocarbons) and HFCs (hydrofluorocarbons) are widely used. However, since freon-based refrigerants are ozone depleting substances and global warming substances, their emission into the atmosphere is severely restricted. Therefore, the development of alternative substances for CFC-based refrigerants, that is, the technical development for so-called CFC removal is under way.

A refrigeration cycle using carbon dioxide (CO ₂ ) as a refrigerant has been proposed as one of the measures to remove CFCs. CO ₂ is one of the natural refrigerants that exist in nature,
Compared to CFCs, they have almost no impact on the global environment.

However, CO₂Vapor compression refrigeration cycle
When applied to the refrigerant₂Due to the inherent thermodynamic properties
Because it becomes a more supercritical cycle, the refrigerant working pressure on the high pressure side
The force is about 10 times higher than that of the fluorocarbon refrigerant. This
Therefore, as a refrigeration cycle device such as a heat exchanger,
The configuration of the heat exchanger for the Freon refrigerant of ₂
Improves pressure resistance when used as a refrigerant
Therefore, it is necessary to increase the wall thickness extremely,
It is difficult to put it into practical use due to the large size and large size of the equipment.

Under such a technical background, as a heat exchanger for a CO ₂ refrigerant having high pressure resistance, its header tank has a header plate having many tube connection holes, and a plate covering one surface of the plate. It is well-known that each end of a plurality of flat heat exchange tubes is communicatively connected to a tube connection hole of a header plate by a cover (Japanese Patent Laid-Open No. 2000-81294, etc.).

[0006]

However, in the above conventional heat exchanger for CO ₂ refrigerant, since the outer peripheral wall of the header tank is composed of two members, the header plate and the plate cover, both of them are There is a problem in that it is difficult to obtain a sufficient joint strength between them and it is difficult to secure a predetermined pressure resistance. In particular, when the passage cross section of the refrigerant flow passage in the header tank is increased to reduce the flow passage resistance, the joint area between the header plate and the plate cover becomes smaller and the joint strength becomes lower. However, there is a problem that the pressure resistance is further reduced.

The present invention solves the above-mentioned problems of the prior art, makes it possible to obtain sufficient pressure resistance while reducing the flow resistance of the refrigerant, and is particularly suitable for use in the refrigeration cycle of CO ₂ refrigerant. An object of the present invention is to provide a heat exchanger, a header tank for a heat exchanger and a manufacturing method thereof that can be performed.

[0008]

In order to achieve the above object, the first aspect of the present invention is to provide a plurality of heat exchange tubes in a header tank length direction between a pair of header tanks, the heat exchange tubes having both ends communicating with both header tanks. A heat exchanger arranged in parallel along the header tank, wherein the header tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover plate jointly arranged on the plate joint surface. The header tank main body has a refrigerant flow passage continuously formed therein along the length direction, and at a predetermined interval along the length direction of the refrigerant flow passage on the plate joint surface. And a plurality of tube connection holes that are respectively communicated with the refrigerant flow passage, and the cover plate is formed corresponding to each of the plurality of tube connection holes. Each tube insertion hole of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate arranged on the plate joint surface, and each tube of the header tank main body is inserted. The gist is that these are joined and fixed in a state of being connected and connected to the connection hole.

In the heat exchanger of the present invention, substantially the entire outer peripheral wall of the header tank is formed by the integrally formed header tank main body, and the cover plate is joined to the inner side surface of the header tank main body for reinforcement. In addition to being able to obtain sufficient pressure resistance,
By improving the pressure resistance, a large flow passage cross-sectional area of the refrigerant can be secured, and the flow passage resistance can be reduced.

The heat exchanger according to the first aspect of the present invention is particularly suitable for a heat exchanger of a type in which heat exchange tubes are arranged in a plurality of rows in the front and rear, and a refrigerant is turned by one of the header tanks. be able to.

That is, in the heat exchanger of the second aspect of the present invention, a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged between the pair of header tanks in parallel along the length direction of the header tank and in width. A heat exchanger arranged in a plurality of rows in the direction (front-back direction), wherein the header tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover jointly arranged on the plate joint surface. A header tank body having a plate, and a refrigerant inflow passage continuously formed along the length direction inside the front side thereof, and a refrigerant continuously formed inside the rear side along the length direction. Outlet passages, on the front side and the rear side of the plate joint surface, are formed at predetermined intervals along the length direction of the refrigerant inflow passage and the refrigerant outflow passage, respectively, and the refrigerant inflow passage and the A plurality of tube connection holes communicating with the medium outflow path, respectively, the cover plate has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, in one header tank ,
A communication hole for communicating between the refrigerant inflow path and the refrigerant outflow path is formed, in each tube insertion hole of the cover plate arranged on the plate joint surface, each end of the plurality of heat exchange tubes. The gist of the invention is to insert and insert these into the tube connection holes of the header tank main body, and to join and fix these in a connected state.

In the heat exchanger of the present invention, similar to the above, it is possible to obtain sufficient pressure resistance and reduce the flow path resistance.

Moreover, since the refrigerant that has passed through the heat exchange tube group on the front side is guided to the heat exchange tube group on the rear side through the communication hole in one of the header tanks, the refrigerant makes a U-turn. The heat exchange can be performed more efficiently.

In the heat exchanger according to the second aspect of the present invention, it is preferable to employ a structure in which a plurality of the refrigerant inflow passages and a plurality of the refrigerant outflow passages are formed in parallel in the header tank body.

That is, when this structure is adopted, the number of partition walls between the refrigerant flow passages increases, and many of the partition walls function as reinforcing walls, so that the pressure resistance can be further improved.

Further, in the second aspect of the present invention, a cutout portion reaching the refrigerant inflow passage and the coolant outflow passage is provided on the outer surface of the end portion of the header tank body, and the cutout portion is inserted and fixed. It is preferable to adopt a configuration in which the ends of the refrigerant inflow passage and the refrigerant outflow passage are closed by the closing plate.

That is, when this structure is adopted, the end portion of the refrigerant flow passage can be surely closed by a simple operation of cutting the end portion of the header tank body and inserting the closing plate.

The third aspect of the present invention is a heat exchanger in which a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along the header tank length direction between a pair of header tanks. The header tank
The header tank body has an inner surface formed as a flat plate joint surface, and a cover plate joined to the plate joint surface, and the header tank body is
A refrigerant flow passage continuously formed in the inside thereof along the length direction, and at the plate joint surface, formed at predetermined intervals along the length direction of the refrigerant flow passage, and the refrigerant flow passage And a plurality of tube connection holes communicating with each other, the cover plate has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, the refrigerant flow in the header tank body An engaging step portion capable of engaging the end portion of the heat exchange tube is provided at a position corresponding to the tube connection hole of the passage, and each tube insertion hole of the cover plate arranged on the plate joint surface is provided. , The respective end portions of the plurality of heat exchange tubes are inserted, the tube end portions are engaged with the engagement step portions, and are connected to the respective tube connection holes of the header tank body. In state, it is summarized as what they will be joined and fixed.

The heat exchanger of the third aspect of the present invention, like the first aspect of the present invention, can obtain sufficient pressure resistance and can reduce the flow path resistance.

Moreover, since the engaging step portion which can engage the end portion of the heat exchange tube is provided at a position corresponding to the tube connection hole of the header tank body, the heat exchange tube is connected to the connection hole of the header tank body. At the time of inserting and connecting to, by engaging the end of the heat exchange tube with the engagement step,
Since it is possible to position the heat exchange tube in the insertion direction, the tube connection work can be easily performed.

The fourth aspect of the present invention is a heat exchanger in which a plurality of heat exchange tubes having both ends connected to both header tanks are arranged in parallel along the length direction of the header tank between a pair of header tanks. The header tank
The header tank body has an inner surface formed as a flat plate joint surface, and a cover plate joined to the plate joint surface, and the header tank body is
A plurality of refrigerant flow passages that are continuously formed in the interior along the length direction and are arranged in parallel in the header tank width direction (front-back direction), and the length of the refrigerant flow passage on the plate joint surface. A plurality of tube connection holes that are formed at predetermined intervals along the direction and that are arranged so as to straddle between the plurality of refrigerant flow passages that are juxtaposed and that communicate with these flow paths, and the cover plate Has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, in the partition wall between the plurality of refrigerant flow passages in the header tank body, corresponding to the tube connection holes. An engaging recessed step portion capable of engaging the end portion of the heat exchange tube is provided, and each end of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate arranged on the plate joint surface. Department The gist is that the tube end part is inserted and engaged with the engaging recessed step part, and these are joined and fixed in a state of being communicatively connected to each tube connection hole of the header tank body. There is.

In the heat exchanger according to the fourth aspect of the present invention, similar to the third aspect of the present invention, sufficient pressure resistance can be obtained, the flow path resistance can be reduced, and the heat exchange tube is connected to the header tank main body. The end of the heat exchange tube engages with the engaging recessed step portion when inserting and connecting to the connection hole, so that the heat exchange tube can be positioned in the insertion direction.

When a refrigerant flow passage is provided side by side as in the fourth aspect of the invention, it is possible to form an engaging recessed step portion as an engaging step portion on the partition wall between the passages.

In a fourth aspect of the present invention, a construction is adopted in which a communication groove for communicating between the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage is formed on the bottom surface of the engagement concave step portion. Preferably.

That is, when the tube end surface is engaged with the bottom surface of the engagement concave step portion, the opening end surface of a part of the tube hole may be closed on the bottom surface of the engagement concave portion, but the above communication groove is formed. By doing so, all the tube holes can be communicated with the refrigerant flow passage, and a decrease in the refrigerant flow rate can be prevented.

According to the fifth aspect of the present invention, between the pair of header tanks, a plurality of heat exchange tubes whose both ends communicate with each other are connected in parallel along the header tank length direction and in the width direction (front-back direction). ) Is a heat exchanger arranged in a plurality of rows, wherein the header tank has a header tank body whose inner surface is formed as a flat plate joint surface,
A plurality of refrigerants having a cover plate joined and arranged on the plate joining surface, the header tank main body being continuously formed along the length direction inside the front side thereof, and arranged in parallel in the front-rear direction. Inflow passages, a plurality of refrigerant outflow passages that are continuously formed inside the rear side along the length direction and are arranged in parallel in the front-rear direction, and the refrigerant inflows on the front side and the rear side of the plate joint surface. Formed at predetermined intervals along each length direction of the passage and the refrigerant outflow passage, and arranged in a manner to straddle between the plurality of refrigerant inflow passages and the plurality of refrigerant outflow passages that are juxtaposed. It has a plurality of front tube connection holes and a plurality of rear tube connection holes that communicate with the refrigerant inflow path and the refrigerant outflow path, respectively, and the cover plate is formed corresponding to each of the plurality of tube connection holes. A plurality of tube insertion holes are formed, one header tank is formed with a communication hole for communicating between the refrigerant inflow path and the refrigerant outflow path, and the plurality of refrigerant inflow paths in the header tank main body and the plurality of communication holes are formed. Each partition wall between the refrigerant outflow passages is provided with an engaging concave step portion capable of engaging the end portion of the heat exchange tube corresponding to the tube connection hole, and is arranged on the plate joint surface. Each end portion of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate, the tube end portion is engaged with the engagement concave step portion, and each tube of the header tank main body In the state of being connected to the connection hole,
The main point is that these are joined and fixed.

Also in the heat exchanger of the fifth aspect of the present invention, similar to the fourth aspect of the present invention, sufficient pressure resistance can be obtained, the flow path resistance can be reduced, and at the time of inserting the heat exchange tube, The tube can be positioned.

In the fifth aspect of the invention, on the bottom surface of the engaging recessed step portion, between the opening end surface of the tube hole in the heat exchange tube and the refrigerant outflow passage, and between the opening end surface of the tube hole and the refrigerant inflow passage. It is desirable to adopt a configuration in which a communication groove for communicating with each other is formed.

That is, when this structure is adopted, the entire tube hole can be communicated with the refrigerant inflow path and the refrigerant outflow path in the same manner as described above, and a sufficient refrigerant flow rate can be secured.

Further, as the shape of the communication groove, the following constitution can be adopted.

That is, in the fifth aspect of the invention, it is possible to preferably employ a structure in which the communication groove is formed in a V groove shape or a structure in which the communication groove is formed in a U-shaped groove shape.

As described above, since the heat exchangers of the first to fifth inventions have sufficient pressure resistance,
It can be suitably used as a heat exchanger for a vapor compression refrigeration cycle using carbon dioxide as a refrigerant.

That is, it is desirable that the heat exchanger according to any one of the first to fifth aspects of the present invention has a structure in which a carbon dioxide refrigerant is used as the refrigerant.

On the other hand, the sixth aspect of the present invention specifies one aspect of the manufacturing process in the heat exchanger of the first aspect of the present invention.

That is, according to the sixth aspect of the present invention, a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged between the pair of header tanks in parallel along the header tank length direction. And a step of preparing a main body intermediate product in which an inner side surface is formed as a flat plate joint surface and a continuous refrigerant flow passage is formed in the inside thereof, A step of forming a plurality of tube connection holes communicating with the refrigerant flow passage at predetermined intervals along the length direction on the plate joint surface of the article to obtain a header tank body, and a joint arrangement on the plate joint surface And a step of preparing a cover plate in which a plurality of tube insertion holes are formed corresponding to the plurality of tube connection holes, respectively, and the cover on the plate bonding surface. Plate is placed, and the tube insertion holes of the cover plate are inserted into the tube connection holes of the header tank body by inserting the ends of the heat exchange tubes into the tube connection holes of the header tank body. The gist includes the process including the process of becoming.

The seventh aspect of the present invention specifies one aspect of the manufacturing process in the heat exchanger of the second aspect of the present invention.

That is, according to the fourth aspect of the present invention, between the pair of header tanks, a plurality of heat exchange tubes having both ends connected to both header tanks are connected in parallel along the header tank length direction and in the width direction (front-back direction). ), The inner surface is formed as a flat plate joint surface, and a refrigerant inflow path is continuously formed in the front inside of the plate along the length direction. , A step of preparing a main body intermediate product in which a refrigerant outflow passage is formed continuously along the length direction inside the rear side, and the refrigerant inflow passage on the front side and the rear side of the plate joint surface in the main body intermediate product And a step of forming a plurality of tube connection holes respectively communicating with the refrigerant outflow passage along the length direction to obtain a header tank main body, and the header tank corresponding to one header tank On the plate joint surface of the body, a step of forming a communication hole for communicating between the refrigerant inflow path and the refrigerant outflow path, and configured to be bonded and arranged on the plate joint surface, each of the plurality of tube connection holes Correspondingly,
A step of preparing a cover plate having a plurality of tube insertion holes, and arranging the cover plate on the plate joint surface, and in each tube insertion hole of the cover plate, each end of the plurality of heat exchange tubes. The gist of the present invention is to include a step of inserting these parts into a tube connection hole of the header tank body and connecting and integrating these parts.

In the seventh invention, the refrigerant inflow path and the refrigerant outflow path in the header tank body are
It is preferable to adopt a structure in which a plurality of each is formed in parallel.

That is, in this case, the number of partition walls between the refrigerant flow passages increases, and the pressure resistance can be further improved.

In the seventh aspect of the invention, it is preferable to employ one in which the main body intermediate product having the refrigerant inflow path and the refrigerant outflow path is formed by extrusion molding or pultrusion molding.

That is, in this case, the intermediate product of the main body can be easily molded, and the heat exchanger can be efficiently manufactured. Further, the header tank body can be formed as a high-strength integrally molded product, and the pressure resistance can be further improved.

Further, in the seventh invention, it is desirable to adopt one in which the plate joint surface is milled.

That is, in this case, since the plate joint surface can be sufficiently smoothed, the cover plate joined to the joint surface can be joined with higher strength, and the pressure strength is further improved. Can be made.

Further, in the seventh invention, it is even more preferable to adopt one in which the tube connection hole is formed by cutting or one in which the communication hole is formed by cutting.

That is, in this case, the tube connection hole and the communication hole can be formed with higher accuracy.

Further, in the seventh aspect of the present invention, it is even more desirable to adopt a configuration in which the tube connection hole and the communication hole are simultaneously formed.

That is, by performing these holes at the same time, the number of processing steps can be reduced and the manufacturing efficiency can be further improved.

The eighth aspect of the present invention specifies one aspect of the manufacturing process in the heat exchanger of the third aspect.

That is, the eighth aspect of the present invention is directed to a heat exchanger in which a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along the header tank length direction between a pair of header tanks. A method of manufacturing, wherein the inner surface is formed as a flat plate joint surface, the step of preparing a main body intermediate product in which a continuous refrigerant flow path is formed along the length direction, and a step of preparing the main body intermediate product On the plate joint surface, a plurality of tube connection holes communicating with the refrigerant flow passage are formed at predetermined intervals along the length direction, and at the positions corresponding to the tube connection holes, the ends of the heat exchange tubes are formed. A step of forming an engaging step part that can engage the parts, and a step of obtaining the header tank main body, the plate joining surface is configured to be joined and arranged, respectively corresponding to the plurality of tube connection holes, A step of preparing a cover plate in which a number of tube insertion holes are formed, and arranging the cover plate on the plate joint surface, and in each tube insertion hole of the cover plate, each end of the plurality of heat exchange tubes Through a portion, and the tube end portion thereof is engaged with the engagement step portion, and is connected and integrated with each of the tube connection holes of the header tank body. It is a summary.

The ninth invention specifies one aspect of the manufacturing process in the heat exchanger of the fourth invention.

That is, the ninth aspect of the present invention relates to a heat exchanger in which a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along the length direction of the header tank between the pair of header tanks. A manufacturing method, wherein the inner surface is formed as a flat plate joint surface, and a plurality of refrigerant flow passages formed continuously in the length direction are formed in parallel in the header width direction (front-back direction). On the plate bonding surface of the intermediate product of the main body,
A plurality of tube connection holes arranged in a manner to straddle between the plurality of refrigerant flow passages provided side by side and communicating with these flow paths,
The end portions of the heat exchange tubes are formed on the partition walls between the plurality of refrigerant flow passages corresponding to the tube connection holes while being formed at predetermined intervals along the length direction of the refrigerant flow passages. A step of forming a mating engagement concave step portion to obtain a header tank main body, and a plurality of tube insertion holes which are configured to be joined and arranged on the plate joint surface and respectively correspond to the plurality of tube connection holes. A step of preparing a cover plate in which holes are formed, arranging the cover plate on the plate joint surface, and inserting each end of the plurality of heat exchange tubes into each tube insertion hole of the cover plate And the tube end portion thereof is engaged with the engaging recessed step portion, and is connected and integrated with each tube connection hole of the header tank main body, and these are integrally joined. It is the gist.

In the ninth aspect of the invention, in the step of obtaining the header tank body, the bottom surface of the engagement recessed step portion is connected to the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage. It is preferable to adopt one that forms a groove.

That is, in this case, as in the above case, the entire tube hole can be communicated with the refrigerant flow passage, and a sufficient amount of refrigerant can be secured.

The tenth aspect of the present invention specifies one aspect of the manufacturing process in the heat exchanger of the fifth aspect of the present invention.

That is, in the tenth aspect of the invention, between the pair of header tanks, a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along the header tank length direction and in the width direction (front and rear). Direction), the inner surface is formed as a flat plate joint surface, and the refrigerant inflow paths that are continuous along the length direction inside the front side are parallel to each other in the front-rear direction. A plurality of main body intermediate products are formed in parallel with each other in the front-rear direction, and a plurality of continuous refrigerant outflow passages are formed in the rear side of the main body intermediate product. A plurality of front tube connections that are arranged in a manner to respectively straddle between the plurality of refrigerant inflow passages and between the plurality of refrigerant outflow passages that are juxtaposed to communicate with the refrigerant inflow passage and the refrigerant outflow passage, respectively. And a plurality of rear tube connecting hole,
The front tube is formed on each partition wall between the plurality of refrigerant inflow paths and between the plurality of refrigerant outflow paths while being formed at predetermined intervals along each length direction of the refrigerant inflow path and the refrigerant outflow path. Corresponding to the connection hole and the rear tube connection hole, a step of forming an engaging concave step portion capable of engaging the end portion of the heat exchange tube to obtain a header tank main body, and joining to the plate joining surface Arranged to be arranged, respectively corresponding to the plurality of tube connection holes, a step of preparing a cover plate in which a plurality of tube insertion holes are formed,
While disposing the cover plate on the plate joint surface, in each tube insertion hole of the cover plate,
Inserting each end of the plurality of heat exchange tubes, engaging the tube end with the engaging recessed step, and communicating with each tube connection hole of the header tank body, these The main point is to include the step of joining and integrating.

In the tenth invention, like the fifth invention, in the step of obtaining the header tank body, the opening end surface of the tube hole in the heat exchange tube and the refrigerant inflow path are formed on the bottom surface of the engaging recessed step portion. It is preferable to employ one that forms a communication groove for communicating the space, the opening end surface of the tube hole, and the refrigerant outflow passage, respectively.

The eleventh aspect of the present invention specifies a header tank as a main component in the heat exchanger of the first aspect.

That is, the eleventh aspect of the present invention is a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel with each other, wherein the inner surface is formed as a flat plate joint surface. A header tank body and a cover plate joined to the plate joining surface, and the header tank body has a refrigerant flow passage continuously formed in the inside thereof along the length direction, and the plate. The joint surface has a plurality of tube connection holes that are formed at predetermined intervals along the lengthwise direction of the refrigerant flow passage, and that communicate with the refrigerant flow passage, respectively, and the cover plate has the plurality of It has a plurality of tube insertion holes formed respectively corresponding to the tube connection holes, each end of the plurality of heat exchange tubes in each tube insertion hole of the cover plate Threaded and is for summarized as made is configured to be communicatively connected to each tube connecting hole of the header tank body.

The 12th invention of the present invention specifies a header tank as a main component in the heat exchanger of the 2nd invention.

That is, the twelfth aspect of the present invention is a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel with each other, the inner side surface being formed as a flat plate joint surface. And a cover plate joined to the plate joining surface, the header tank body is continuously formed along the length direction inside one side (front side) in the width direction of the header tank body. A refrigerant inflow passage, a refrigerant outflow passage continuously formed in the other side (rear side) in the width direction along the length direction, and a refrigerant inflow passage on the front side and the rear side of the plate joint surface. A plurality of tube connection holes that are respectively formed at predetermined intervals along each lengthwise direction of the refrigerant outlet passage, and that communicate with the refrigerant inlet passage and the refrigerant outlet passage, respectively, the cover plate, It has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, each end portion of the plurality of heat exchange tubes are inserted into each tube insertion hole of the cover plate, the header The gist is that it is configured so as to communicate with each tube connection hole of the tank main body.

The twelfth invention is similar to the second invention.
It is preferable to adopt the following configuration.

That is, in the twelfth aspect of the invention, firstly, a plurality of the refrigerant inflow passages and the refrigerant outflow passages in the header tank body are formed in parallel, respectively. In the outer surface of the end portion of the header tank body, a cutout portion that reaches the coolant inflow passage and the coolant outflow passage is provided, and by the closing plate inserted and fixed in the cutout portion, the coolant inflow passage and Adopting a configuration in which the end of the refrigerant outflow passage is closed, and thirdly, a configuration in which a communication hole for communicating between the refrigerant inflow passage and the refrigerant outflow passage is formed in the header tank main body. It is preferable to adopt.

The thirteenth aspect of the present invention specifies a header tank as a main component in the heat exchanger of the third aspect.

That is, the thirteenth aspect of the present invention is a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel with each other, the inner side surface being formed as a flat plate joint surface. A header tank body and a cover plate joined to the plate joining surface, and the header tank body has a refrigerant flow passage continuously formed in the inside thereof along the length direction, and the plate. The joint surface has a plurality of tube connection holes that are formed at predetermined intervals along the lengthwise direction of the refrigerant flow passage, and that communicate with the refrigerant flow passage, respectively, and the cover plate has the plurality of It has a plurality of tube insertion holes formed respectively corresponding to the tube connection holes, and corresponds to the tube connection holes of the refrigerant flow passage in the header tank body. Is provided with an engagement step portion capable of engaging the end portion of the heat exchange tube, and the tube insertion holes of the cover plate arranged on the plate joint surface each have a plurality of heat exchange tubes. The end is inserted,
The gist of the present invention is that the tube end is engaged with the engagement step and is connected to each tube connection hole of the header tank body.

The fourteenth invention specifies a header tank as a main component in the heat exchanger of the fourth invention.

That is, the fourteenth aspect of the present invention is a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel with each other, wherein the inner surface is formed as a flat plate joint surface. And a cover plate bonded to the plate bonding surface, the header tank main body is formed continuously in the inside along the length direction, and the header tank width direction (front and rear). A plurality of refrigerant flow passages arranged in parallel with each other, and the plurality of refrigerant flow passages that are formed in the plate joint surface at predetermined intervals along the length direction of the refrigerant flow passage and are provided side by side. And a plurality of tube connection holes arranged in a manner that spans the spaces and communicate with these flow paths, and the cover plate is formed corresponding to each of the plurality of tube connection holes. An engagement recess having a plurality of tube insertion holes and capable of engaging the end portion of the heat exchange tube with a partition wall between the plurality of refrigerant flow passages in the header tank body, corresponding to the tube connection hole. A step is provided,
Each end portion of the plurality of heat exchange tubes is inserted through each tube insertion hole of the cover plate arranged on the plate joint surface, and the tube end portion is engaged with the engagement concave step portion. At the same time, the gist of the present invention is that the header tank body is configured so as to be communicated with each tube connection hole.

In the fourteenth invention, similarly to the fourth invention, the bottom surface of the engaging recessed step portion is a communication groove for communicating between the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage. It is desirable to adopt a configuration in which

The fifteenth aspect of the present invention specifies the header tank as a main component in the heat exchanger of the fifth aspect.

That is, the fifteenth aspect of the present invention is a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel with each other, the inner side surface being formed as a flat plate joint surface. And a cover plate joined to the plate joining surface, the header tank body is continuously formed along the length direction inside one side (front side) in the width direction of the header tank body. A plurality of refrigerant inflow passages arranged in parallel in the front-rear direction and a plurality of refrigerant inflow passages formed continuously along the length direction inside the other side (rear side) in the width direction and arranged in parallel in the front-rear direction. Of the refrigerant outflow passage, and on the front side and the rear side of the plate joint surface,
Formed at predetermined intervals along each length direction of the refrigerant inflow path and the refrigerant outflow path, and in a mode that straddles between the plurality of refrigerant inflow paths and the plurality of refrigerant outflow paths that are provided side by side It has a plurality of front tube connection holes and a plurality of rear tube connection holes that are arranged and communicate with the refrigerant inflow path and the refrigerant outflow path, respectively, and the cover plate corresponds to each of the plurality of tube connection holes. Each of the partition walls between the plurality of refrigerant inflow passages and between the plurality of refrigerant outflow passages in the header tank body, corresponding to the tube connection hole, A plurality of heat exchange tubes are provided in the tube insertion holes of the cover plate, which are provided with engaging recessed steps capable of engaging the ends of the exchange tubes. Each end portion of is inserted, the tube end portion is engaged with the engaging recessed step portion, and is configured to be connected to each tube connection hole of the header tank main body in communication. There is.

In the fifteenth aspect of the invention, as in the fifth aspect of the invention, on the bottom surface of the engagement concave step portion, between the opening end surface of the tube hole in the heat exchange tube and the refrigerant outflow passage, and the opening of the tube hole. It is preferable to adopt a configuration in which a communication groove is formed to connect the end surface and the refrigerant inflow path.

The sixteenth aspect of the present invention specifies one aspect of the manufacturing process for the header tank for heat exchanger of the sixth aspect of the present invention.

That is, the sixteenth aspect of the present invention is a method of manufacturing a header tank for a heat exchanger for connecting the ends of a plurality of heat exchange tubes arranged in parallel to each other, wherein the plate has a flat inner surface. A step of preparing a main body intermediate product which is formed as a joint surface and in which a continuous refrigerant flow passage is formed along the length direction, and the plate joint surface of the main body intermediate product is communicated with the coolant flow passage A step of forming a plurality of tube connection holes at predetermined intervals along the length direction to obtain a header tank main body, and the plate connection surface is configured to be bonded and arranged, and the plurality of tube connection holes are respectively arranged. Correspondingly, in the step of preparing a cover plate having a plurality of tube insertion holes formed therein, and with the plurality of tube insertion holes fitted to the plurality of tube connection holes, Those containing and bonding the cover plate to Tanku body of the plate joining surface on which the subject matter.

The seventeenth aspect of the present invention specifies one aspect of the manufacturing process for the header tank for heat exchanger of the seventh aspect of the present invention.

That is, the seventeenth aspect of the present invention is a method for manufacturing a header tank for a heat exchanger for connecting and connecting the ends of a plurality of heat exchange tubes arranged in parallel with each other. Is formed as a surface, a refrigerant inflow passage is continuously formed along the length direction inside the width direction front side, and a refrigerant outflow passage is continuously formed along the length direction inside the width direction rear side. A step of preparing the formed main body intermediate product, and a plurality of tube connection holes respectively communicating with the refrigerant inflow passage and the refrigerant outflow passage in the longitudinal direction on the front side and the rear side of the plate joint surface in the main body intermediate product. And a plurality of tube insertion holes are formed corresponding to the plurality of tube connection holes, respectively. A step of preparing a cover plate formed with, and a step of joining the cover plate on the plate joining surface of the header tank body in a state where the plurality of tube insertion holes are fitted to the plurality of tube connection holes; The summary is that including.

In the seventeenth aspect of the present invention, similarly to the above, it is preferable to adopt a configuration in which a plurality of the refrigerant inflow passages and a plurality of the refrigerant outflow passages are formed in parallel in the header tank main body.

The eighteenth aspect of the present invention specifies one aspect of the manufacturing process in the header tank for heat exchanger of the eighth aspect.

That is, the eighteenth aspect of the present invention is a method for manufacturing a header tank for a heat exchanger for connecting and connecting the ends of a plurality of heat exchange tubes arranged in parallel with each other, wherein the inner surface of the header tank is flat. Preparing a main body intermediate product formed as a surface and having a continuous refrigerant flow passage formed therein along the length direction, and communicating with the refrigerant flow passage at the plate joint surface of the main body intermediate product While forming a plurality of tube connection holes at predetermined intervals along the length direction, at the position corresponding to each tube connection hole, an engagement step portion capable of engaging the end of the heat exchange tube is formed. The step of obtaining the header tank body, and the cover plate that is configured to be joined and arranged on the plate joining surface and that has a plurality of tube insertion holes corresponding to the plurality of tube connection holes, respectively. The gist includes a step of providing and a step of joining the cover plate to a plate joining surface of the header tank body in a state where the plurality of tube insertion holes are fitted to the plurality of tube connection holes. .

The nineteenth aspect of the present invention specifies one aspect of the manufacturing process in the header tank for heat exchanger of the ninth aspect.

That is, the nineteenth aspect of the present invention is a method for manufacturing a header tank for a heat exchanger for connecting and connecting the ends of a plurality of heat exchange tubes arranged in parallel with each other, wherein the inner surface of the header tank is flat. A step of preparing a main body intermediate product having a plurality of refrigerant flow passages formed in parallel with each other in the header width direction (front-back direction) formed in parallel with each other in the length direction, and the plate of the main body intermediate product. On the joint surface,
While forming a plurality of tube connection holes arranged in a manner to straddle between the plurality of refrigerant flow passages provided side by side and communicating with these flow passages, at a predetermined interval along the length direction of the refrigerant flow passage A partition wall between the plurality of refrigerant flow passages,
A step of forming an engaging concave step portion capable of engaging the end portion of the heat exchange tube corresponding to the tube connection hole to obtain a header tank main body, and a configuration for joining and arranging to the plate joining surface Corresponding to each of the plurality of tube connection holes, a step of preparing a cover plate in which a plurality of tube insertion holes are formed, and in a state in which the plurality of tube insertion holes are adapted to the plurality of tube connection holes. And a step of joining the cover plate to the plate joining surface of the header tank body.

In the nineteenth aspect of the invention, as in the ninth aspect of the invention, in the step of obtaining the header tank main body, the opening end face of the tube hole in the heat exchange tube and the refrigerant flow passage are formed on the bottom surface of the engaging concave step portion. It is advisable to adopt the one that forms a communication groove for communicating the spaces.

The 20th invention of the present invention specifies one aspect of the manufacturing process in the header tank for heat exchanger of the 10th invention.

That is, the twentieth aspect of the present invention is a method for manufacturing a header tank for a heat exchanger for connecting and connecting the ends of a plurality of heat exchange tubes arranged in parallel with each other, wherein the inner surface of the tank is flat. A plurality of refrigerant inflow passages that are formed as a surface and that are continuous in the longitudinal direction are formed in parallel in one side in the width direction (front side), and are formed in the other side in the width direction (rear side). A step of preparing a main body intermediate product in which a plurality of refrigerant outflow passages continuous along the length direction are formed in parallel in the front-rear direction, and the plurality of refrigerant inflow passages provided side by side on the plate joint surface of the main body intermediate product A plurality of front side tube connection holes and a plurality of rear side tube connection holes, which are arranged in such a manner as to straddle the spaces and between the plurality of refrigerant outflow passages and communicate with the refrigerant inflow passage and the refrigerant outflow passage, respectively. The long While being formed at predetermined intervals along the direction, each partition wall between the plurality of refrigerant inflow passages and between the plurality of refrigerant outflow passages, corresponding to the front tube connection hole and the rear tube connection hole. A step of forming an engaging concave step portion capable of engaging the end portion of the heat exchange tube to obtain a header tank body, and a step of joining and arranging to the plate joining surface, and the plurality of tube connecting holes. Corresponding to each of the above, a step of preparing a cover plate having a plurality of tube insertion holes formed therein, and plate joining of the header tank body in a state where the plurality of tube insertion holes are adapted to the plurality of tube connection holes. The gist includes a step of joining the cover plate on a surface.

In the twentieth aspect of the invention, as in the tenth aspect of the invention, in the step of obtaining the header tank body, the opening end face of the tube hole in the heat exchange tube and the refrigerant inflow path are formed on the bottom surface of the engaging recessed step portion. It is desirable to employ a groove that forms a communication groove for communicating the space, the opening end surface of the tube hole, and the refrigerant outflow path.

[0084]

1 is a perspective view showing a heat exchanger according to an embodiment of the present invention. As shown in the figure, this heat exchanger is adopted in a vapor compression refrigeration cycle using CO ₂ as a refrigerant, and has a pair of flat header tanks (10) (30) arranged vertically. And a pair of header tanks (10) and (30), both ends of which are communicated and connected to the header tanks (10) and (30) in parallel along the header tank length direction (left and right direction) and the header tank width. Basically, flat heat exchange tubes (1a) (1b) arranged in two rows in the front-back direction and corrugated fins (5) respectively arranged between the tubes (1a) (1b) adjacent in the left-right direction. It is provided as an essential component.

As shown in FIGS. 1 to 6, the lower refrigerant turn side header tank (10) has a header tank body (11) and a cover plate (20).

The header tank body (11) has four refrigerant flow passages (12a) (12b) extending continuously in the lengthwise direction and arranged in parallel along the front-rear direction. There is. Four refrigerant flow passages (12a) (12
In b), the two refrigerant passages on the front side are the refrigerant inflow passages (1
2a) and (12a), and the two rear refrigerant passages are formed as refrigerant outlet passages (12b) (12b).

The inner side surface (upper surface side) of the header tank body (11) is formed as a flat plate joint surface (13), and the header is formed on the front half and the rear half of this plate joint surface (13). A plurality of tube connection holes (14a) at predetermined intervals along the tank length direction.
(14b) is formed. The tube connection hole (14a) on the front side is formed in an elongated hole shape corresponding to the cross-sectional shape of the heat exchange tube (1a), and inside the header tank body (11), the two refrigerant inflow passages (12) on the front side are formed.
a) (12a) is arranged so as to straddle both passages (12
a) (12a). The tube connection hole (14b) on the rear side is similar to the above, and the heat exchange tube (1b)
Is formed in a long hole shape corresponding to the cross-sectional shape of the refrigerant tank. Inside the header tank body (11), the two refrigerant outflow passages (12b) and (12b) on the rear side are arranged so as to extend over both passages (12b). ) (12b).

Here, the tube connection holes (14a) (14
b) is formed by cutting as will be described later, but by this cutting, the partition wall (18a) between the two refrigerant inflow passages (12a) (12a) on the front side and the two rear walls are formed. Partition wall (1) between the refrigerant outflow passages (12b) (12b) of
8b) and the tube connection holes (14a) (14b) in position, and the engaging concave step portion (19) as the engaging step portion.
a) (19b) is formed.

At the plate joint surface (13) of the header tank body (11), the tube connection hole (14)
A plurality of communication holes (15) having a long hole elongated in the front-rear direction are formed at predetermined positions between a) and (14b). The communication hole (15) is arranged inside the header tank body (11) so as to straddle the four refrigerant flow passages (12a) (12b) in the front-rear direction and the four passages (12a) (12b).
To the refrigerant inflow passage (12
A) and the refrigerant outflow passage (12b) are communicated with each other.

On the outer side surfaces (lower side surfaces) of both ends of the header tank body (11), four refrigerant flow passages (12a) (12) are continuous from the front end surface to the rear end surface.
Notches (16) and (16) are formed so as to traverse b).

Further, the closing plates (17) and (17) are fitted and fixed in the notches (16) and (16) in a suitable state.
The closing plates (17) and (17) are configured to close both ends of each of the refrigerant flow passages (12a) and (12b) in a sealed state.

On the other hand, the cover plate (20) has a size suitable for the laminated state on the plate joint surface (13) of the header tank body (11). The cover plate (20) has two front and rear portions corresponding to the tube connection holes (14a) and (14b) of the header tank body (11).
A plurality of elongated tube insertion holes (24a) (24b) are formed at predetermined intervals in the length direction in rows.

The cover plate (20) is joined to the plate joining surface (13) of the header tank body (11) in a laminated state. In this state, the communication hole (15) on the header tank main body (11) side has the cover plate (2).
0) while being blocked by each tube connection hole (14a)
(14b) is each tube insertion hole (24a) (24b)
Will be arranged to fit.

As shown in FIGS. 5, 7 and 8, the upper side refrigerant inlet / outlet header tank (30) has a header tank body (31) and a cover plate (40) in the same manner as described above.
And have.

In the header tank main body (31), the refrigerant inflow passage (32a) and the refrigerant outflow passage (32) are provided as described above.
b), plate joint surface (33), tube connection hole (34
a) (34b), notch (16), partition wall (38a)
(38b) and engaging recessed steps (39a) (39b) are formed. Further, the header tank body (31) has communication holes (6) for communicating the refrigerant inflow passages (32a) (32a) and the refrigerant outflow passages (32b) (32b).
0) are provided at predetermined intervals. The header tank body (31) has a refrigerant inflow path (32a).
Also, a communication passage for communicating between the refrigerant outflow passage (32b) is not formed.

Further, tube cover holes (44a) (44b) are formed in the cover plate (40) similarly to the above.

Further, the closing plate (37) is inserted and arranged in the notch (36) on one side of the header tank body (31) in the same manner as described above, and the refrigerant inflow path (32a) and the refrigerant outflow path are formed. One end side of (32b) is closed.

Further, a coolant inlet / outlet plate (50) is inserted and arranged in a conformable manner in the notch (36) on the other side.
This refrigerant inlet / outlet plate (50) has a refrigerant inlet (5
1a) and a refrigerant outlet port (51b) are formed, and the refrigerant inlet port (51a) is located inside the header tank body (31) and the front two refrigerant inlet channels (32a) (32a) are provided.
While communicating with the end of a), the refrigerant outlet (51
b) is inside the header tank body (31),
It communicates with the ends of the two refrigerant outflow passages (32b) (32b) on the rear side.

Further, the refrigerant inflow pipe (52a) and the refrigerant outflow pipe (52b) are inserted from the end of the header tank body (31), and the insertion side end of the refrigerant inflow pipe (52a) is connected to the refrigerant inflow / outflow plate ( 50) is connected to the refrigerant inlet port (51a) of the refrigerant outlet pipe (52b), and the insertion side end of the refrigerant outlet pipe (52b) is connected to the refrigerant outlet port (51) of the refrigerant inlet / outlet plate (50).
b). Thereby, the refrigerant inflow pipe (52a)
Of the upper header tank (30) with the refrigerant inflow passage (32
The refrigerant outflow pipe (52b) is connected to the a).
Are communicatively connected to the refrigerant outflow passage (32b).

Here, in this embodiment, the header tanks (10) and (30) are manufactured by utilizing extrusion molding or pultrusion molding.

That is, the refrigerant flow passages (12a) (12b) (32a) (3) are formed by extrusion molding or pultrusion molding.
After manufacturing the main body intermediate product having 2b), the main body intermediate product is subjected to a cutting process to form the tube connection hole (14
a) (14b) (34a) (34b), communication hole (1
5) The notch (16) is formed to obtain the header tank bodies (11) and (31) having the above-mentioned configuration.

When the communication hole (15) is formed like the header tank body (11) on the refrigerant turn side, the cutting process and the tube connection holes (14a) (14) are performed.
b) By simultaneously performing the cutting process for forming, the number of processing steps can be reduced and the manufacturing efficiency can be improved.

Further, in the present embodiment, after the above-mentioned cutting work is performed, the plate joining surfaces (13) (33) of the header tank bodies (11) (31) are milled to form a smooth surface. Therefore, it is preferable to eliminate the uneven portion. That is, by forming the joint surfaces (13) and (33) smooth, it is possible to increase the joint area with the cover plates (20) and (40) that are joined and integrated therein, and also the joint degree (adhesion degree) is good. Therefore, the bonding strength can be improved and the pressure resistance can be further improved.

Further, the cover plates (20) (40)
Can be manufactured using, for example, calender molding, extrusion molding, pultrusion molding, or the like. That is, after the flat plate-shaped intermediate product is manufactured by these moldings, the tube insertion hole (24
a) (24b) (44a) (44b) is formed, whereby the cover plates (20) (40) can be obtained.

As shown in FIGS. 2 and 3, the heat exchange tubes (1a) and (1b) are formed by extrusion molding or pultrusion molding, and have a flat cross section. The heat exchange tubes (1a) (1b) are formed with a plurality of tube holes (2) such as circles which extend continuously in the length direction and are arranged in parallel in the tube width direction.

Then, the heat exchange tubes (1a) (1b)
The upper and lower ends of the header tank (10) (3
0) is inserted into the tube insertion holes (24a) (24b) (44a) (44b) of the cover plates (20) (40) and the tube connection holes (14a) (14b) of the header tank bodies (11) (31). ) (34a) (34
b) are respectively inserted and connected. At this time, as shown in FIGS. 4 and 9, the end portions of the heat exchange tubes (1a) (1b) are separated from each other by the partition walls (18a) (18b) (38a) (38).
engaging concave step portions (19a) (19b) (3) formed in b).
9a) (39b) by being fitted conformally,
Positioning in the insertion direction of the heat exchange tubes (1a) (1b) is achieved.

Thus, the header tank (10) (30)
The heat exchange tubes (1a) and (1b) are inserted into the heat exchange tubes (1a) and (1b), and the corrugated fins (5) are arranged between the heat exchange tubes (1a) and (1b). A form of heat exchanger is formed.

In the heat exchanger of this embodiment, each component is made of, for example, aluminum or its alloy, and further, an aluminum brazing sheet having a brazing material laminated on at least one surface thereof, and these components are required. According to the above, it is assembled in a predetermined heat exchanger shape through a brazing material and temporarily fixed. The temporarily assembled products thus temporarily fixed are collectively brazed in a furnace to integrally connect them together.

In the present invention, however, when assembling the heat exchanger, partial brazing may be performed for assembly, or partial brazing and collective brazing may be combined for assembly. Any assembling method may be used.

In the heat exchanger configured as described above, the CO ₂ refrigerant flown into the refrigerant inflow passage (32a) of the upper header tank (30) through the refrigerant inflow pipe (52a) is a plurality of CO ₂ refrigerants on the front side. Through the heat exchange tube (1a) of the lower header tank (10)
flow into a). The refrigerant flowing into the inflow passage (12a) passes through the communication hole (15) and the refrigerant outflow passage (12b).
After being guided to, the refrigerant passes through the plurality of heat exchange tubes (1b) on the rear side and flows into the refrigerant outflow passage (32b) of the upper header tank (30). After that, the refrigerant is sent to the next cycle part through the refrigerant outflow pipe (52b).

As described above, according to the heat exchanger of the present embodiment, the header tank main body (11), which is an integrally molded product, covers almost the entire outer peripheral wall of the header tank (10) (30).
(31), the cover plate (2) is formed on the inner side surface of the header tank body (11) (31).
0) (30) is to be joined and fixed to reinforce,
Sufficient pressure resistance can be obtained.

Further, in the heat exchanger of this embodiment, since sufficient pressure resistance can be secured, the refrigerant flow passage (12a)
The cross-sectional areas of (12b), (32a), and (32b) can be increased, the flow resistance can be reduced, and the heat exchange performance can be further improved.

In the header tanks (10) and (30),
Four refrigerant flow passages (12a) (12b) (32a) (3
2b) is formed, the number of partition walls for partitioning the flow paths increases, and the large number of partition walls function as reinforcing walls, so that the pressure resistance can be further improved.

Also, the header tank (1
Since the communication hole (15) in 0) is formed at the same time as the tube connection hole is formed by cutting, the number of steps can be reduced compared to the case where it is separately processed for forming the communication hole, and it is efficient and simple. Can be manufactured.

Moreover, since the communication hole (15) is hermetically sealed by the joining of the cover plate (20), the sealing work is unnecessary, and the manufacturing can be performed more efficiently.

By forming the communication hole (15) to have a narrow width, the joint area between the cover plate (20) and the header tank body (11) can be increased, so that the joint strength is increased. The pressure resistance can be further improved.

Further, in this embodiment, the cut portions (16) and (36) are formed at both ends of the header tank body (11) (31) on the outer surface side, and the cut portions (16) are formed.
The blocking plates (17) and (37) are inserted and arranged in the (36), and each refrigerant flow passage (12a) in the header tank
Since the end portions of (12b), (32a), and (32b) are closed in a hermetically sealed state, the manufacturing can be further simplified. For example, when the end portion of the header tank is covered with a cap or the like to close the end portion of the refrigerant flow passage, it is necessary to process a component having a complicated shape such as the cap, which makes manufacturing difficult. On the other hand, in the present embodiment, cut portions (16) (36) are formed at the ends of the header tank bodies (11) (31) by cutting or the like, and the plate-shaped closing plates (17) (37) are formed therein. ) Can be easily manufactured only by inserting and fixing.

Furthermore, in this embodiment, the header tank bodies (11) and (31) are manufactured by extrusion molding or pultrusion molding suitable for mass production, so that the header tank bodies (11) (31) can be manufactured more efficiently.

Further, in this embodiment, the plate joining surfaces (13) (3) of the header tank bodies (11) (31) are used.
Since the milling process is applied to 3) to form a smooth surface, the cover plates (20) (40) that are joined and integrated with the plate joining faces (13) (33) can be joined with higher strength. Therefore, the pressure resistance can be further improved.

Further, in this embodiment, the heat exchange tubes (1a) (1b) are connected to the header tank bodies (11) (3).
1) Connection holes (14a) (14b) (34a) (34)
Heat exchange tubes (1a) (1b) when inserted into b)
End faces of the partition walls (18a) (18b) (38a) (3
8b) engaging concave step portions (19a) (19b)
Since the heat exchange tubes (1a) and (1b) can be positioned in the insertion direction by engaging the (39a) and (39b) in a conformable state, the tube connection work can be easily performed.

Here, in the present embodiment, as shown in FIG. 9, since the end faces of the tubes (1a) (1b) are joined to the bottom surfaces of the engaging recessed step portions (19a) (19b), a part of the tubes is not used. The opening end surface of the hole (2) has an engaging concave step (19a) (1
9b) is blocked by the bottom surface of the tube hole (2), the refrigerant does not flow through a part of the tube hole (2), the flow rate of the refrigerant decreases, and the heat exchange performance may decrease.

Therefore, as shown in FIG. 10 and FIG.
A communication groove for communicating between the two refrigerant inflow passages (12a) (12a) and the two refrigerant outflow passages (12b) (12b) on the bottom surface of the engaging recessed step portions (19a) (19b). It is sufficient to form (70). Thereby, the opening end surface of the tube hole (2) in each tube (1a) (1b) is passed through the communication groove (70) and the refrigerant inflow path (12).
Since the a) and the refrigerant outflow passages (12b) are electrically connected to each other, the refrigerant can flow through all the tube holes (2), the amount of flowing refrigerant can be increased, and the heat exchange performance can be improved.

The communicating groove (70) may be formed in a V-shaped groove as shown in FIG. 11 or may be formed in a U-shaped groove as shown in FIG. Further, the method of forming the communication groove (70) is, for example, as described above, in the header tank body (11), the tube connection holes (14a) (1).
After forming 4b) by a cutting process, a cutting process is further performed to form the communication groove (70). In this case, the width of the communication groove (70) formed by the second cutting process is 0.4 to 0.5 than the tube width.
It is preferable to set the size smaller by mm.

Needless to say, the communication groove (70) is
It may be formed not only on the refrigerant outlet passage (12b) side but also on the upper header tank (30).

On the other hand, in the above embodiment, the heat exchanger having the structure in which the heat exchange tubes (2a) and (2b) are arranged in two rows in the front and rear has been described as an example, but the present invention is not limited thereto and the heat exchange is not limited thereto. Tubes arranged in a row or 3
It can also be applied to those arranged in rows or more.

Further, in the present invention, the refrigerant flow passage (12
a) (12b), tube connection holes (14a) (14b)
(34a) (34b), tube insertion holes (24a) (2
The number and shape of 4b), (44a) and (44b) are not limited to those in the above embodiment.

[0127]

As described above, according to the heat exchangers of the first to fifth inventions, almost the entire outer peripheral wall of the header tank is formed by the integrally formed header tank main body, and the header tank is formed. Since the cover plate is joined and reinforced on the inner surface side of the main body, sufficient pressure resistance can be obtained, and by improving the pressure resistance, a large flow passage cross-sectional area of the refrigerant can be secured. The flow path resistance can be reduced and the heat exchange performance can be improved. Particularly in the heat exchangers of the third to fifth inventions, when the heat exchange tube is inserted and connected to the header tank, the insertion direction of the heat exchange tube can be positioned, so that the tube connection work can be performed easily. There is an effect that can be.

Since the heat exchanger manufacturing method of the sixth to tenth aspects of the present invention specifies one aspect of the manufacturing process in the heat exchanger of the first to fifth aspects of the invention, the heat exchanger having the above effects can be obtained. Exchangers can be manufactured.

The header tank for a heat exchanger of the 11th to 15th aspects of the invention has the above effects because it specifies the header tank as a main component of the heat exchanger of the 1st to 5th aspects of the invention. A heat exchanger can be obtained.

The method for manufacturing a header tank for a heat exchanger according to the sixteenth to twentieth aspects of the present invention specifies one aspect of the manufacturing process in the header tank as a main component of the heat exchanger according to the first to fifth aspects. Therefore, a heat exchanger having the above effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the vicinity of a lower header tank in the heat exchanger of the embodiment.

FIG. 3 is an exploded perspective view showing the vicinity of the lower header tank in the heat exchanger of the embodiment.

FIG. 4 is a cross-sectional view showing the vicinity of a tube connecting portion of both upper and lower header tanks in the heat exchanger of the embodiment.

FIG. 5 is a cross-sectional view showing the periphery of a communication hole of a lower header tank in the heat exchanger of the embodiment.

FIG. 6 is a perspective view showing a lower header tank main body applied to the heat exchanger of the embodiment.

FIG. 7 is a perspective view showing the vicinity of an upper header tank in the heat exchanger of the embodiment.

FIG. 8 is an exploded perspective view showing the vicinity of the upper header tank in the heat exchanger of the embodiment.

9 is a cross-sectional view taken along line XX of FIG.

FIG. 10 is a cross-sectional view showing the periphery of a tube connection portion of a lower header tank in a heat exchanger as a first modified example.

11 (a) is a sectional view taken along line YY of FIG. 10, and FIG. 11 (b) is an exploded sectional view of FIG. 11 (a).

12A is a cross-sectional view corresponding to a cross section taken along line YY of FIG. 10, showing a tube connection portion of a lower header tank in heat exchange as a second modification, FIG. 2B is an exploded sectional view of FIG.

[Explanation of symbols]

1a, 1b ... Heat exchange tube 2 ... Tube holes 10, 30 ... Header tank 11, 31 ... Header tank main body 12a, 32a ... Refrigerant inflow path (refrigerant flow path) 12b, 32b ... Refrigerant outflow path (refrigerant flow path) 13, 33 ... Plate joining surfaces 14a, 14b, 34a, 34b ... Tube connection hole 15 ... Communication holes 16, 36 ... Cutouts 17, 37 ... Closing plates 18a, 18b, 38a, 38b ... Partition walls 19a, 19b, 39a, 39b ... Engagement concave step (engagement step) 20, 40 ... Cover plates 24a, 24b, 44a, 44b ... Tube insertion hole 70 ... Communication groove

Claims (43)

[Claims] 1. A heat exchanger in which a plurality of heat exchange tubes, both ends of which are connected to both header tanks for communication, are arranged in parallel along a length direction of the header tank between a pair of header tanks. The tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover plate jointly arranged on the plate joint surface, and the header tank main body has a lengthwise direction inside thereof. And a plurality of tube connections formed on the plate joint surface at predetermined intervals along the length direction of the refrigerant flow passage and communicating with the refrigerant flow passage, respectively. A hole, the cover plate has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, on the plate joint surface The end portions of the plurality of heat exchange tubes are inserted into the tube insertion holes of the placed cover plate, and are connected and fixed to the tube connection holes of the header tank body while being joined and fixed. A heat exchanger characterized by the following. 2. A plurality of heat exchange tubes connecting both ends to both header tanks between a pair of header tanks are arranged in parallel along the header tank length direction and in a plurality of rows in the width direction (front-back direction). A heat exchanger arranged, wherein the header tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover plate jointly arranged on the plate joint surface, the header The tank body has a refrigerant inflow passage continuously formed in the front inside thereof along the length direction, a refrigerant outflow passage continuously formed in the rear inside of the tank main body, and the plate joint surface. Formed on the front side and the rear side of the refrigerant inflow path and the refrigerant outflow path at predetermined intervals, respectively, and communicate with the refrigerant inflow path and the refrigerant outflow path, respectively. A plurality of tube connection holes, the cover plate has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, one of the header tank, the refrigerant inflow path and the refrigerant A communication hole for communicating between the outflow passages is formed, and each end portion of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate arranged on the plate joint surface, and the header is inserted. A heat exchanger characterized by being joined and fixed to each of the tube connection holes of the tank main body in a state of being connected and connected. 3. The heat exchanger according to claim 2, wherein a plurality of the refrigerant inflow passages and a plurality of the refrigerant outflow passages are formed in parallel in the header tank body. 4. A cutout portion that reaches the coolant inflow passage and the coolant outflow passage is provided on an outer surface of an end portion of the header tank body, and the coolant is provided by a closing plate inserted and fixed in the cutout portion. The heat exchanger according to claim 2 or 3, wherein the ends of the inflow passage and the refrigerant outflow passage are closed. 5. A heat exchanger in which a plurality of heat exchange tubes, both ends of which are connected to both header tanks for communication, are arranged in parallel along a length direction of the header tank between a pair of header tanks. The tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover plate jointly arranged on the plate joint surface, and the header tank main body has a lengthwise direction inside thereof. And a plurality of tube connections formed on the plate joint surface at predetermined intervals along the length direction of the refrigerant flow passage and communicating with the refrigerant flow passage, respectively. And the cover plate has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, the header tank body An engagement step portion capable of engaging the end portion of the heat exchange tube is provided at a position corresponding to the tube connection hole of the refrigerant flow passage in each of the cover plates arranged on the plate joint surface. Each end portion of the plurality of heat exchange tubes is inserted into the tube insertion hole, the tube end portion is engaged with the engagement step portion, and is communicated with each tube connection hole of the header tank body. A heat exchanger characterized in that they are joined and fixed together in a closed state. 6. A heat exchanger in which a plurality of heat exchange tubes, both ends of which are connected to both header tanks for communication, are arranged in parallel along a length direction of the header tank between a pair of header tanks. The tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover plate jointly arranged on the plate joint surface, and the header tank main body has a lengthwise direction inside thereof. Multiple refrigerant flow passages that are continuously formed and arranged in parallel in the header tank width direction (front-rear direction), and at predetermined intervals along the length direction of the refrigerant flow passage on the plate joint surface. And a plurality of tube connection holes that are arranged in a manner to straddle the plurality of refrigerant flow passages that are provided side by side and communicate with these flow paths, and the cover plate, It has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, a partition wall between the plurality of refrigerant flow passages in the header tank body, corresponding to the tube connection hole, Engagement concave steps that can engage the ends of the heat exchange tubes are provided, and the ends of the plurality of heat exchange tubes are inserted into the tube insertion holes of the cover plate arranged on the plate joint surface. It is inserted, the tube end portion is engaged with the engaging recessed step portion, and these are joined and fixed in a state of being connected and connected to each tube connection hole of the header tank main body. Heat exchanger to. 7. The communicating groove for communicating between the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage is formed on the bottom surface of the engaging recessed step portion.
The heat exchanger described. 8. A plurality of heat exchange tubes connecting both ends to both header tanks between a pair of header tanks are arranged in parallel along the header tank length direction and in a plurality of rows in the width direction (front-back direction). A heat exchanger arranged, wherein the header tank has a header tank main body whose inner surface is formed as a flat plate joint surface, and a cover plate jointly arranged on the plate joint surface, the header A tank main body is formed continuously along the length direction inside the front side thereof, and a plurality of refrigerant inflow passages arranged in parallel in the front-rear direction, and continuously formed along the length direction inside the rear side. And a plurality of refrigerant outflow passages arranged in parallel in the front-rear direction, and on the front side and the rear side of the plate joint surface along a predetermined length along each length direction of the refrigerant inflow passage and the refrigerant outflow passage. A plurality of front tube connection holes, which are formed at intervals and are arranged in a manner to straddle between the plurality of refrigerant inflow passages and the plurality of refrigerant outflow passages that are juxtaposed to communicate with the refrigerant inflow passage and the refrigerant outflow passage, respectively. A plurality of rear tube connection holes, the cover plate has a plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, one of the header tank, the refrigerant inflow path And a communication hole for communicating between the refrigerant outlet passages, each partition wall between the plurality of refrigerant inlet passages and the plurality of refrigerant outlet passages in the header tank body, corresponding to the tube connection hole. An engaging recessed step portion capable of engaging the end portion of the heat exchange tube is provided, and the plurality of tube insertion holes are provided in the tube insertion holes of the cover plate arranged on the plate joint surface. Each end portion of the heat exchange tube is inserted, the tube end portion is engaged with the engaging recessed step portion, and these are joined in a state of being connected and communicated with each tube connection hole of the header tank body. A heat exchanger characterized by being fixed. 9. The bottom surface of the engaging recessed portion communicates between the opening end surface of the tube hole and the refrigerant outflow passage in the heat exchange tube and between the opening end surface of the tube hole and the refrigerant inflow passage, respectively. The heat exchanger according to claim 8, wherein a communication groove for forming the heat exchanger is formed. 10. The heat exchanger according to claim 9, wherein the communication groove is formed in a V groove shape. 11. The heat exchanger according to claim 9, wherein the communication groove is formed in a U-shaped groove shape. 12. The heat exchanger according to claim 1, wherein a carbon dioxide refrigerant is used as the refrigerant. 13. A method of manufacturing a heat exchanger, wherein a plurality of heat exchange tubes, both ends of which are connected in communication with both header tanks, are arranged in parallel along a length direction of the header tank between a pair of header tanks. A step of preparing a main body intermediate product having an inner side surface formed as a flat plate joint surface and a continuous refrigerant flow passage formed in the inside thereof in the longitudinal direction; and the plate joint surface of the main body intermediate product. A step of forming a plurality of tube connection holes communicating with the refrigerant flow passage at predetermined intervals along the length direction to obtain a header tank body, and being configured to be bonded and arranged on the plate bonding surface, A step of preparing a cover plate having a plurality of tube insertion holes respectively corresponding to the plurality of tube connection holes; and disposing the cover plate on the plate joint surface. Rutotomoni, each tube insertion holes of the cover plate,
A method of manufacturing a heat exchanger, comprising a step of inserting the end portions of the plurality of heat exchange tubes and communicatingly connecting the tube connection holes of the header tank body to join and integrate these. 14. A plurality of heat exchange tubes, both ends of which are connected to both header tanks for communication, are arranged in parallel along the length direction of the header tank and between the pair of header tanks in a plurality of rows in the width direction (front-back direction). A method of manufacturing a heat exchanger, wherein the inner surface is formed as a flat plate joint surface, a refrigerant inflow passage is formed continuously along the length direction inside the front side, and a long side is formed inside the rear side. A step of preparing a main body intermediate product in which a refrigerant outflow passage is continuously formed along the depth direction, and in the refrigerant inflow passage and the refrigerant outflow passage on the front side and the rear side of the plate joint surface in the main body intermediate product. A step of forming a plurality of tube connection holes communicating with each other along the length direction to obtain a header tank body, and a plate joint surface of the header tank body corresponding to one header tank A step of forming a communication hole for communicating between the refrigerant inflow path and the refrigerant outflow path, and configured to be bonded and arranged on the plate bonding surface,
A step of preparing a cover plate in which a plurality of tube insertion holes are formed respectively corresponding to the plurality of tube connection holes; and disposing the cover plate on the plate joint surface and inserting each tube of the cover plate. In the hole,
A method of manufacturing a heat exchanger, comprising a step of inserting the end portions of the plurality of heat exchange tubes and communicatingly connecting the tube connection holes of the header tank body to join and integrate these. 15. The method of manufacturing a heat exchanger according to claim 14, wherein a plurality of the refrigerant inflow passages and a plurality of the refrigerant outflow passages are formed in parallel in the header tank body. 16. The method of manufacturing a heat exchanger according to claim 14, wherein the intermediate body product having the refrigerant inflow passage and the refrigerant outflow passage is formed by extrusion molding or pultrusion molding. 17. The method for manufacturing a heat exchanger according to claim 14, wherein the plate joint surface is milled. 18. The method of manufacturing a heat exchanger according to claim 14, wherein the tube connection hole is formed by cutting. 19. The method for manufacturing a heat exchanger according to claim 14, wherein the communication hole is formed by cutting. 20. The formation of the tube connection hole and the formation of the communication hole are performed simultaneously.
9. The method for manufacturing the heat exchanger according to any one of 9 above. 21. A method of manufacturing a heat exchanger, wherein a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along a length direction of the header tank between a pair of header tanks. , A step of preparing a main body intermediate product having an inner side surface formed as a flat plate joint surface and having a continuous refrigerant flow passage formed in the inside thereof in the plate joint surface; While forming a plurality of tube connection holes communicating with the refrigerant flow passage at predetermined intervals along the length direction, the end of the heat exchange tube can be engaged at a position corresponding to each tube connection hole A plurality of tube insertion holes are formed corresponding to the plurality of tube connection holes, respectively. A step of preparing a cover plate in which holes are formed, and arranging the cover plate on the plate joint surface, and in each tube insertion hole of the cover plate,
Inserting each end of the plurality of heat exchange tubes, engaging the tube end with the engaging stepped portion, and joining these in a state of being communicatively connected to each tube connection hole of the header tank body A method of manufacturing a heat exchanger, including the step of integrating. 22. A method of manufacturing a heat exchanger, wherein a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along a length direction of the header tank between a pair of header tanks. , A step of preparing a main body intermediate product in which the inner side surface is formed as a flat plate joint surface and a plurality of refrigerant flow passages which are continuous in the length direction are formed in parallel in the header width direction (front-back direction), A plurality of tube connection holes, which are arranged on the plate joint surface of the main body intermediate product so as to straddle between the plurality of refrigerant flow passages provided side by side and communicate with these flow passages, respectively. In the partition wall between the plurality of refrigerant flow passages, corresponding to the tube connection holes, the engaging recesses that can engage the ends of the heat exchange tubes are formed at predetermined intervals along the depth direction. Shape step Then, a step of obtaining the header tank main body, and a cover plate configured to be bonded and arranged on the plate bonding surface and having a plurality of tube insertion holes corresponding to the plurality of tube connection holes are prepared. Step, and placing the cover plate on the plate bonding surface, in each tube insertion hole of the cover plate,
Inserting each end of the plurality of heat exchange tubes, engaging the tube end with the engaging recessed step, and communicating with each tube connection hole of the header tank body, these A method for manufacturing a heat exchanger, which comprises a step of joining and integrating. 23. In the step of obtaining the header tank main body, a communication groove is formed on the bottom surface of the engagement recessed step portion for communicating between the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage. Claim 22
A method for manufacturing the heat exchanger described. 24. Between a pair of header tanks, a plurality of heat exchange tubes having both ends communicating with both header tanks are arranged in parallel along the header tank length direction and in a plurality of rows in the width direction (front-back direction). A manufacturing method of a heat exchanger to be arranged, wherein an inner side surface is formed as a flat plate joint surface, and a plurality of refrigerant inflow paths continuous along the length direction are formed in parallel in the front-rear direction inside the front side thereof. At the same time, a step of preparing a main body intermediate product in which a plurality of refrigerant outflow passages that are continuous in the lengthwise direction inside the rear side are formed in parallel in the front-rear direction; A plurality of front tube connection holes and a plurality of rear tube tubs, which are arranged so as to straddle the plurality of refrigerant inflow paths and the plurality of refrigerant outflow paths, respectively, and communicate with the refrigerant inflow path and the refrigerant outflow path, respectively. While connecting holes are formed at predetermined intervals along each length direction of the refrigerant inflow path and the refrigerant outflow path, each partition wall between the plurality of refrigerant inflow paths and between the plurality of refrigerant outflow paths. A step of forming an engaging concave step portion capable of engaging the end portion of the heat exchange tube corresponding to the front tube connection hole and the rear tube connection hole to obtain a header tank main body, A step of preparing a cover plate configured to be joined and arranged on a plate joining surface and having a plurality of tube insertion holes respectively corresponding to the plurality of tube connecting holes; and the cover plate on the plate joining surface. And place it in each tube insertion hole of the cover plate,
Inserting each end of the plurality of heat exchange tubes, engaging the tube end with the engaging recessed step, and communicating with each tube connection hole of the header tank body, these A method for manufacturing a heat exchanger, which comprises a step of joining and integrating. 25. In the step of obtaining the header tank main body, on the bottom surface of the engagement recessed step portion, between the opening end surface of the tube hole and the refrigerant inflow path of the heat exchange tube, and between the opening end surface of the tube hole and the 25. The method of manufacturing a heat exchanger according to claim 24, wherein communication grooves are formed to respectively communicate with the refrigerant outflow passages. 26. A header tank for a heat exchanger for communicatingly connecting respective ends of a plurality of heat exchange tubes arranged in parallel, the header tank main body having an inner side surface formed as a flat plate joint surface. And a cover plate joined and arranged on the plate joint surface, wherein the header tank main body has a refrigerant flow passage formed continuously along the lengthwise direction therein, and the plate joint surface, A plurality of tube connection holes are formed at predetermined intervals along the length direction of the refrigerant flow passage, and each has a plurality of tube connection holes that communicate with the refrigerant flow passage, and the cover plate is provided in each of the plurality of tube connection holes. It has a plurality of tube insertion holes formed correspondingly, each end of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate, Heat exchanger header tank, characterized by comprising configured to be communicatively connected to each tube connection hole Datanku body. 27. A heat exchanger header tank for communicatingly connecting respective ends of a plurality of heat exchange tubes arranged in parallel, the header tank body having an inner surface formed as a flat plate joint surface. And a cover plate joined and arranged on the plate joining surface, and the header tank main body is formed with a refrigerant inflow passage continuously formed in the width direction on one side (front side) along the length direction. , A refrigerant outflow passage formed continuously along the length direction inside the other side (rear side) in the width direction, and the refrigerant inflow passage and the refrigerant outflow passage on the front side and the rear side of the plate joint surface. Formed at predetermined intervals along each length direction,
And a plurality of tube connection holes that communicate with the refrigerant inflow path and the refrigerant outflow path, respectively, and the cover plate has a plurality of tube insertion holes formed corresponding to the plurality of tube connection holes, respectively. The end portions of the plurality of heat exchange tubes are inserted into the tube insertion holes of the cover plate, and are connected to the tube connection holes of the header tank body so as to communicate with each other. Header tank for heat exchanger. 28. The heat exchanger header tank according to claim 27, wherein a plurality of the refrigerant inflow passages and a plurality of the refrigerant outflow passages are formed in parallel in the header tank body. 29. A cutout portion reaching the coolant inflow passage and the coolant outflow passage is provided on an outer surface of an end portion of the header tank body, and the coolant is provided by a closing plate inserted and fixed in the cutout portion. 29. The heat exchanger header tank according to claim 27 or 28, wherein ends of the inflow passage and the refrigerant outflow passage are closed. 30. The heat exchanger header tank according to claim 27, wherein the header tank body is formed with a communication hole for communicating between the refrigerant inflow passage and the refrigerant outflow passage. 31. A header tank for a heat exchanger for communicatingly connecting respective ends of a plurality of heat exchange tubes arranged in parallel, the header tank main body having an inner surface formed as a flat plate joint surface. And a cover plate joined to the plate joint surface, wherein the header tank main body has a refrigerant flow passage formed continuously along the length direction therein, and the plate joint surface, A plurality of tube connection holes are formed at predetermined intervals along the length direction of the refrigerant flow passage, and each has a plurality of tube connection holes that communicate with the refrigerant flow passage, and the cover plate is provided in each of the plurality of tube connection holes. It has a plurality of tube insertion holes formed correspondingly, and the heat exchange is performed at a position corresponding to the tube connection hole of the refrigerant flow passage in the header tank body. An engagement step portion capable of engaging the end portion of the tube is provided, and each end portion of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate arranged on the plate joint surface. A heat exchanger header tank, wherein a tube end portion of the heat exchanger is configured to be engaged with the engagement step portion and communicated with each tube connection hole of the header tank body. 32. A header tank for a heat exchanger for communicatingly connecting respective ends of a plurality of heat exchange tubes arranged in parallel, the header tank main body having an inner side surface formed as a flat plate joint surface. And a cover plate joined and arranged on the plate joining surface, wherein the header tank body is continuously formed in the inside along the length direction, and is arranged in parallel in the header tank width direction (front-back direction). A plurality of refrigerant flow passages that are arranged, and in the plate joint surface, formed at predetermined intervals along the length direction of the refrigerant flow passage, and in an aspect of straddling between the plurality of refrigerant flow passages that are provided side by side. And a plurality of tube connection holes that are arranged and communicate with these flow passages, and the cover plate has a plurality of tubes formed respectively corresponding to the plurality of tube connection holes. The partition wall between the plurality of refrigerant flow passages in the header tank body has a through hole, and an engaging recessed step portion capable of engaging the end portion of the heat exchange tube corresponding to the tube connection hole. Each end portion of the plurality of heat exchange tubes is inserted into each tube insertion hole of the cover plate provided on the plate joint surface, and the tube end portion is engaged with the engagement concave step portion. A header tank for a heat exchanger, wherein the header tank for heat exchanger is configured so as to be connected to each other and connected to each tube connection hole of the header tank body. 33. The heat exchange according to claim 32, wherein a communication groove for communicating between the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage is formed on the bottom surface of the engagement recessed step portion. Dedicated header tank. 34. A header tank for a heat exchanger for communicatingly connecting respective ends of a plurality of heat exchange tubes arranged in parallel, the header tank body having an inner side surface formed as a flat plate joint surface. And a cover plate joined and arranged on the plate joining surface, wherein the header tank body is continuously formed along the length direction inside one side (front side) in the width direction thereof, and in the front-back direction. A plurality of refrigerant inflow passages arranged in parallel and continuously formed along the length direction inside the other side (rear side) in the width direction,
And a plurality of refrigerant outflow passages arranged in parallel in the front-rear direction,
On the front side and the rear side of the plate joint surface, formed between the plurality of refrigerant inflow paths that are formed at predetermined intervals along each length direction of the refrigerant inflow path and the refrigerant outflow path, respectively, and It has a plurality of front-side tube connection holes and a plurality of rear-side tube connection holes that are arranged in a manner to respectively straddle between a plurality of refrigerant outflow paths and communicate with the refrigerant inflow path and the refrigerant outflow path, respectively, and the cover plate A plurality of tube insertion holes formed respectively corresponding to the plurality of tube connection holes, each partition wall between the plurality of refrigerant inflow passages and the plurality of refrigerant outflow passages in the header tank body, Corresponding to the tube connection hole, an engaging concave step portion capable of engaging the end portion of the heat exchange tube is provided, and each cheek of the cover plate arranged on the plate joint surface. End portions of the plurality of heat exchange tubes are inserted into the tube insertion holes, the tube end portions are engaged with the engaging concave step portions, and communicated with the tube connection holes of the header tank body. A header tank for a heat exchanger, which is configured to be connected. 35. The bottom surface of the engaging recessed portion communicates between the opening end surface of the tube hole and the refrigerant outflow passage in the heat exchange tube and between the opening end surface of the tube hole and the refrigerant inflow passage, respectively. The header tank for a heat exchanger according to claim 34, wherein a communication groove for forming the same is formed. 36. A method of manufacturing a header tank for a heat exchanger for connecting and connecting the ends of a plurality of heat exchange tubes arranged in parallel, wherein the inner surface is formed as a flat plate joint surface, A step of preparing a main body intermediate product in which a continuous refrigerant flow passage is formed along the length direction, and a plurality of tube connection holes communicating with the refrigerant flow passage on the plate joint surface of the main body intermediate product A step of forming a header tank body by forming the header tank body along the length direction at predetermined intervals, and the header tank body is arranged to be joined to the plate joint surface. A step of preparing a cover plate in which tube insertion holes are formed, and a state in which the plurality of tube insertion holes are fitted to the plurality of tube connection holes, and Method for producing a heat exchanger header tank comprising the step of bonding the cover plate to the preparative joint plane. 37. A method of manufacturing a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel, wherein the inner surface is formed as a flat plate joint surface, A refrigerant inflow passage is continuously formed along the length direction inside one side (front side) in the width direction, and a refrigerant inflow side is continuously formed inside the other side (rear side) in the width direction along the length direction. A step of preparing a main body intermediate product in which an outflow passage is formed, and a plurality of tube connection holes respectively communicating with the refrigerant inflow passage and the refrigerant outflow passage on the front side and the rear side of the plate joint surface in the main body intermediate product. A step of forming each along the length direction to obtain a header tank main body, and a step of joining and arranging on the plate joining surface,
Corresponding to each of the plurality of tube connection holes, a step of preparing a cover plate in which a plurality of tube insertion holes are formed, in a state in which the plurality of tube insertion holes are adapted to the plurality of tube connection holes, A method of manufacturing a header tank for a heat exchanger, comprising the step of joining the cover plate to a plate joining surface of a header tank body. 38. The method of manufacturing a header tank for a heat exchanger according to claim 37, wherein a plurality of the refrigerant inflow passages and a plurality of the refrigerant outflow passages are formed in parallel in the header tank body. 39. A method of manufacturing a header tank for a heat exchanger for interconnecting and connecting respective ends of a plurality of heat exchange tubes arranged in parallel, wherein an inner surface is formed as a flat plate joint surface, A step of preparing a main body intermediate product in which a continuous refrigerant flow passage is formed along the length direction, and a plurality of tube connection holes communicating with the refrigerant flow passage on the plate joint surface of the main body intermediate product Are formed at predetermined intervals along the length direction, and at the position corresponding to each tube connection hole, an engagement step portion capable of engaging the end of the heat exchange tube is formed to form a header tank body. And a step of preparing a cover plate configured to be jointly arranged on the plate joint surface and having a plurality of tube insertion holes respectively corresponding to the plurality of tube connection holes, In a state adapted to said plurality of tube insertion holes in a plurality of tubes connecting hole, a manufacturing method of a heat exchanger header tank comprising the step of bonding the cover plate on the plate joint surface of the header tank body. 40. A method of manufacturing a header tank for a heat exchanger for connecting and connecting the ends of a plurality of heat exchange tubes arranged in parallel, wherein the inner surface is formed as a flat plate joint surface, A step of preparing a main body intermediate product in which a plurality of refrigerant flow passages continuous in the length direction are formed in parallel in the header width direction (front-back direction); A plurality of tube connection holes arranged in a manner straddling the plurality of refrigerant flow passages and communicating with these flow passages are formed at predetermined intervals along the length direction of the refrigerant flow passage, A step of obtaining a header tank main body by forming an engaging concave step portion capable of engaging an end portion of the heat exchange tube on a partition wall between the plurality of refrigerant flow passages, corresponding to the tube connection hole; , The plate joint surface And a step of preparing a cover plate in which a plurality of tube insertion holes are formed corresponding to the plurality of tube connection holes, respectively, and the plurality of tube insertion holes are inserted into the plurality of tube connection holes. A method of manufacturing a header tank for a heat exchanger, the method including a step of joining the cover plate to a plate joining surface of the header tank body in a state where the holes are matched. 41. In the step of obtaining the header tank body, a communication groove for communicating between the opening end surface of the tube hole in the heat exchange tube and the refrigerant flow passage is formed in the bottom surface of the engagement concave step portion. Claim 40
A method for manufacturing a header tank for a heat exchanger as described. 42. A method of manufacturing a header tank for a heat exchanger for connecting and connecting each end of a plurality of heat exchange tubes arranged in parallel, wherein the inner surface is formed as a flat plate joint surface, Inside the width direction one side (front side), a plurality of refrigerant inflow passages that are continuous along the length direction are formed in parallel in the front-rear direction, and
A step of preparing a main body intermediate product in which a plurality of continuous refrigerant outflow passages are formed in parallel in the front-rear direction inside the other side (rear side) in the width direction, and the plate joint surface of the main body intermediate product A plurality of front tube connection holes and a plurality of front tube connection holes that are arranged in a manner to respectively straddle between the plurality of refrigerant inflow passages and the plurality of refrigerant outflow passages that are juxtaposed to communicate with the refrigerant inflow passage and the refrigerant outflow passage, respectively. The rear tube connection holes are formed at predetermined intervals along the lengthwise direction of the refrigerant flow passage, while the front side is provided on each partition wall between the plurality of refrigerant inflow passages and between the plurality of refrigerant outflow passages. Corresponding to the tube connecting hole and the rear tube connecting hole, a step of forming an engaging recessed step portion capable of engaging the end portion of the heat exchange tube to obtain a header tank body, and a plate joining surface To be joined And a step of preparing a cover plate in which a plurality of tube insertion holes are formed corresponding to the plurality of tube connection holes, respectively, and a state in which the plurality of tube insertion holes are adapted to the plurality of tube connection holes. And a step of joining the cover plate to the plate joining surface of the header tank body, the method of manufacturing a header tank for a heat exchanger. 43. In the step of obtaining the header tank main body, on the bottom surface of the engagement recessed step portion, between the opening end surface of the tube hole in the heat exchange tube and the refrigerant inflow path, and between the opening end surface of the tube hole and the 43. The method for manufacturing a header tank for a heat exchanger according to claim 42, wherein a communication groove for communicating with each of the refrigerant outflow passages is formed.