JP2009168415A - Accumulator and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum accumulator welding structure and welding method reducing a welding failure to attain the smooth flow of a refrigerant in a tube. <P>SOLUTION: The accumulator is composed of heat exchanger piping 4 made of aluminum; an accumulator body 1 made of aluminum; and an inner pipe 3 made of aluminum and a sleeve 8 made of stainless steel. The sleeve 8 is inserted around the outer periphery of an insertion part 5 of the inner pipe 3, and the insertion part 5 of the inner pipe 3 is inserted inside the inner periphery of the heat exchanger piping 4 via the sleeve 8. The inner pipe 3 with these components connected thereto is inserted in an opening 2 of the accumulator body 1, and a connection part of the heat exchanger piping 4 is welded to reduce the welding failure. The flow of the refrigerant can thereby be made smooth. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an aluminum accumulator constituting a refrigeration cycle and a method for assembling the same in a refrigeration apparatus such as a refrigerator.

  In general, in a heat exchanger used in a refrigerator for home use, the aluminum accumulator and the heat exchanger pipe are welded by inserting a stainless steel sleeve having an inner circumference of a joint portion of the heat exchanger pipe into the aluminum accumulator. And a heat exchanger pipe made of aluminum, a joining portion of the aluminum material and the aluminum material is formed, and the outer periphery of the butting portion is welded (see Patent Document 1).

  In recent years, household appliances such as refrigerators have been further reduced in cost, and since the combustible refrigerant is used as the refrigerant used, the heat exchanger that is an internal functional component is also low in cost. There is a demand for improved welding reliability.

  FIG. 7 is a cross-sectional view showing a welded structure of a pipe connection portion in a conventional aluminum accumulator described in Patent Document 1.

As shown in FIG. 7, conventionally, a heat exchanger pipe 102 through which the refrigerant 101 flows, an aluminum inner pipe 105 attached to the inner periphery of the opening end 104 of the aluminum accumulator 103, and a stainless steel In an aluminum pipe welded structure that includes a sleeve 106 and welds the outer periphery of the open end 104, the inner pipe 105 and the heat exchanger pipe 102 are butt-joined via the sleeve 106 to open the open end of the aluminum accumulator 103. Reference numeral 104 denotes a structure in which the sleeve 106 is positioned substantially in the center and the outer periphery of the connecting portion 107 is welded.
Japanese Patent No. 3220866

  However, in the above conventional configuration, since the heat exchanger pipe 102 is butt-joined via the stainless steel rib 106, the amount of aluminum required for welding is small, and the aluminum material such as an aluminum filler rod is used for welding. Supply is required.

  In this case, if the welding skill is low, there is a problem that an appropriate aluminum material cannot be supplied and there are many welding defects.

  Further, since the stainless steel sleeve 106 is difficult to position and the adhesion between the aluminum inner pipe 105 and the heat exchanger pipe 102 is poor, the welding is disengaged due to an impact such as displacement or dropping during welding. There was a problem that there were many defects such as.

  As described above, the welded portion between the aluminums has many welding defects, and it is necessary to rework and remanufacture, making it difficult to reduce the production cost.

  In view of the above, there is a need for a welding structure and a welding method that satisfy both the reduction in welding defects and the smooth flow of refrigerant.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an aluminum accumulator that sufficiently suppresses the occurrence of poor welding in a welded portion and allows a coolant to smoothly flow inside.

  In order to solve the above conventional problems, an accumulator according to the present invention includes an aluminum inner pipe inserted into a stainless steel sleeve, and then the inner pipe and sleeve are connected to the heat exchanger pipe. Insert the heat exchanger piping into the accumulator body from the inner pipe side, and the accumulator body, heat exchanger piping, sleeve and inner pipe are overlapped. The welded part is welded.

  The stacked structure of the accumulator body and the heat exchanger pipe ensures the amount of aluminum necessary for welding, and enables welding without reducing the thickness of the aluminum pipe (heat exchanger pipe). As a result, welding work is facilitated, welding defects can be reduced without requiring high welding skills, and production costs can be reduced. Further, the restriction portion provided on the inner pipe facilitates positioning of the sleeve, stabilizes the shape in the pipe after welding, and enables a smooth flow of the refrigerant.

  The present invention facilitates welding work, can sufficiently reduce welding defects, suppresses displacement of piping inside the accumulator accompanying welding, and enables an accumulator made of aluminum capable of a smooth flow of refrigerant, and An assembly method thereof can be provided.

  In addition, since the reliability of welding is high, it can be incorporated into a refrigeration apparatus using a flammable refrigerant, and the reliability of the refrigeration apparatus can be improved.

  According to the first aspect of the present invention, there is provided an aluminum accumulator body having an opening for connecting pipes formed at a diameter smaller than a center portion at both ends, and an aluminum heat exchange inserted into one end of the accumulator body. Pipe, stainless steel sleeve inserted into the heat exchanger pipe, and an aluminum inner pipe disposed in the accumulator body and having one end inserted into the heat exchanger pipe via the sleeve The inner pipe is provided with a restriction portion for restricting at least movement of the sleeve, and a heat exchanger pipe into which the inner pipe is inserted via the sleeve is inserted into the opening of the accumulator body, and the opening Are welded.

  With this configuration, the opening of the accumulator main body, which is the welding location, becomes a part where the aluminum heat exchanger piping and the aluminum inner pipe overlap in addition to the aluminum accumulator main body, which is sufficient for the welded portion. A sufficient amount of aluminum can be ensured.

  As a result, the reliability of welding is increased, and an increase in manufacturing cost due to poor welding can be suppressed, and the joint between the tip of the heat exchanger pipe and the inner pipe is a welded part of the accumulator body and the heat exchanger pipe. Since it is located closer to the inside of the accumulator body, it is possible to prevent molten aluminum accompanying welding from flowing out into the accumulator, and to suppress deterioration in quality.

  Furthermore, the restriction part provided on the inner pipe facilitates the positioning of the stainless steel sleeve, so that the fixing structure of the welded inner pipe, sleeve, and heat exchanger pipe is stable, and the shape dimensions are secured. Reliability can be improved, and a smooth flow of the refrigerant can be achieved by stabilizing the fixing structure of the inner pipe, the sleeve, and the heat exchanger pipe.

  According to a second aspect of the present invention, in the first aspect of the present invention, a tapered portion formed by making the tip of the inner pipe smaller in diameter than the center portion is used as the restricting portion.

  With this configuration, the restricting portion can be formed by a method such as drawing of a pipe, and by using a tapered portion, processing is facilitated, and the sleeve, It is easy to ensure the insertion and fitting with the exchanger pipe, and can suppress the deviation of the insertion and fitting during welding.

  According to a third aspect of the present invention, in the second aspect of the present invention, a flared portion that contacts the tapered surface of the restriction portion is provided on the restriction portion side end surface of the sleeve.

  By adopting such a configuration, the inclined surface of the flare portion serves as a guide when the sleeve is attached to the inner pipe, so that the attachment property of the sleeve to the inner pipe is improved and workability can be improved.

  In addition, due to the flared shape of the flare, even when molten aluminum flows out during welding, the flow can be blocked, resulting in more reliable prevention of outflow into the accumulator body. The quality of the product can be stabilized.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the outer peripheral surface of the sleeve is provided with irregularities extending continuously in the axial direction of the sleeve.

  By adopting such a configuration, the contact area with the heat exchanger pipe is reduced, and the transfer of heat to the inner pipe during welding is alleviated. As a result, deformation due to heat is suppressed, the fixing structure of the inner pipe, the sleeve, and the heat exchanger pipe is stabilized, and the reliability of the welding effect can be improved.

  According to the fifth aspect of the present invention, there is provided an aluminum accumulator main body having an opening for pipe connection formed at a diameter smaller than a central portion at both ends, and an aluminum heat exchange inserted into one end of the accumulator main body. Pipe, stainless steel sleeve inserted into the heat exchanger pipe, and an aluminum inner pipe disposed in the accumulator body and having one end inserted into the heat exchanger pipe via the sleeve The inner pipe is provided with a restricting portion for restricting movement of the inner pipe and an insertion allowance to the heat exchanger pipe, and further, the accumulator body extends in the radial direction in the heat exchanger pipe. In an accumulator provided with a contact portion for restricting an insertion allowance to the inner pipe, the sleeve is connected to the inner pipe. Insert the inner pipe into which the sleeve has been inserted until it abuts, and insert the heat exchanger pipe into the heat exchanger pipe until the end of the heat exchanger pipe abuts against a restriction provided on the inner pipe. Is inserted from the inner pipe side to the opening of the accumulator main body until the contact portion comes into contact, and the opening is welded in the inserted state.

  According to this method, since the sleeve and the heat exchanger pipe can be positioned by the restricting portion provided on the inner pipe, the fixing structure of the inner pipe, the sleeve, and the heat exchanger pipe after welding is stable, and the dimensions of the shape are secured. In addition, the reliability can be improved, and the flow of the refrigerant can be smoothly performed by stabilizing the fixing structure of the inner pipe, the sleeve, and the heat exchanger pipe.

  Also, since the overlapping part of the pipe connection opening and the heat exchanger pipe provided in the accumulator body is welded, a sufficient aluminum wall thickness can be secured in the welded part, so that the welding work can be facilitated. Welding defects can be reduced. In addition, the use of an aluminum filler rod that is normally used during aluminum welding can be reduced, and a reduction in production cost can be expected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a welded portion of an accumulator according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of a stainless steel sleeve in the accumulator of the first embodiment.

  1 and 2, the accumulator main body 1 is made of pure aluminum or aluminum alloy, and is formed into a cylindrical shape by an appropriate processing method, and is formed at its both ends with a smaller diameter than the central portion by drawing or the like. An opening 2 for pipe connection is provided. Since the specific shape may be a known shape, here, the portions related to the gist of the present invention will be illustrated and described.

  An inner pipe 3 and a heat exchanger pipe (hereinafter referred to as a pipe) 4 are pipe bodies that are connected to each other, and are made of pure aluminum or an aluminum alloy as a material, like the accumulator body 1.

  The connection end side of the inner pipe 3 with the pipe 4 is formed with a smaller diameter by drawing or the like, and serves as an insertion portion 5 to the pipe 4. Therefore, when the insertion portion 5 is formed, a tapered regulation portion 6 whose diameter gradually decreases is provided on the connection end side.

  Further, the pipe 4 is provided with an abutting portion 7 that extends in the radial direction and regulates an insertion allowance to the accumulator body.

  Furthermore, the inner pipe 3 is inserted into the pipe 4 through a stainless steel sleeve 8 that prevents molten aluminum from flowing into the pipe 4 during welding. The sleeve 8 is as shown in FIG. , One stainless plate is press-molded, curved into a cylindrical shape, and has a 1 to 1.5 mm wide slit (opposite edge interval) 9 in the longitudinal direction, the diameter of which is The inner diameter of the inner pipe 3 is substantially equal.

  Therefore, the sleeve 8 is attached to the insertion portion 5 by expanding the diameter by utilizing the slit 9 of the sleeve 8 and the elasticity of the sleeve 8 and inserting the sleeve 8 into the insertion portion 5. It is in a state where it is crimped to the insertion portion 5 and cannot be easily removed. In addition, about the stainless steel of the sleeve 8, it is desirable to use an austenite type | system | group from a viewpoint of corrosion.

  The accumulator is assembled by connecting the inner pipe 3 to the pipe 4 via the sleeve 8 and inserting the accumulator body 1 into the accumulator body 1. Hereinafter, the assembly of the accumulator will be described.

  First, a stainless steel sleeve 8 is attached to the insertion portion 5 of the inner pipe 3. At this time, the sleeve 8 is inserted to a position where the end surface thereof abuts on the restriction portion 6 provided on the inner pipe 3.

  As described above, the sleeve 8 is attached by inserting it in the circumferential direction once about the size of the slit 9 (about 1 to 1.5 mm). After insertion, due to the springback effect, the sleeve 8 is firmly pressed against the outer peripheral surface of the insertion portion 5 of the inner pipe 3, so that it is possible to prevent displacement and dropping during welding.

  Preferably, when the size of the slit 9 is as close to zero as possible (in contact with the edge) when the sleeve 8 is mounted, the contact area with the insertion portion 5 increases, and the molten aluminum material during welding Can be prevented from penetrating into the insertion portion 5 side.

  In other words, the suppression of permeation of the molten aluminum material into the insertion portion 5 side during welding leads to securing the amount of aluminum during welding, and as a result, reduction of welding defects can be expected.

  Next, the inner pipe 3 fitted with the sleeve 8 is inserted into the inner periphery of the pipe 4. At this time, the pipe 4 is inserted until the tip of the pipe 4 comes into contact with the restricting portion 6 of the inner pipe 3. In such a state, a force is applied so that the sleeve 8 also comes into contact with the restricting portion 6, so that no positional deviation occurs.

  Further, the inner pipe 3 and the pipe 4 connected through the sleeve 8 as described above are inserted so that the inner pipe 3 is positioned in the accumulator body 1. The insertion is performed until the contact portion 7 of the pipe 4 contacts the opening 2 of the accumulator body 1.

  And the welding assembly of an accumulator is completed by welding mainly the contact location in the state which the contact part 7 is contact | abutting to the opening part 2 of the accumulator main body 1. FIG.

  In such assembly, the thickness of the aluminum material is ensured by the superposition structure of the accumulator body 1 and the pipe 4 during welding, so that the welding operation can be facilitated, and the reworking or remanufacturing associated with poor welding is possible. Can be reduced. In addition, the use of an aluminum filler rod that is normally used during aluminum welding can be reduced, and a reduction in production cost can be expected.

  In addition, since refrigerant leakage due to poor welding can be reduced, the risk of ignition due to refrigerant leakage when using flammable refrigerants such as isobutane and propane can be reduced, increasing reliability. Is something that can be done.

  Further, in the connection between the inner pipe 3 and the pipe 4 and the insertion of the pipe 4 into the accumulator main body 1, the force acting on the sleeve 8 acts in the direction in which the sleeve 8 abuts against the regulating portion 6 in any case. The displacement of the sleeve 8 during assembly can also be suppressed, and as a result, the fixing structure of the inner pipe 3, the sleeve 8, and the pipe 4 after welding can be stabilized, and the reliability can be improved in securing the dimensions of the shape. In addition, a smooth flow of the refrigerant is possible.

  In other words, the restricting portion 6 provided in the inner pipe 3 restricts the positioning of the sleeve 8 and the insertion allowance of the pipe 4 into the inner pipe 3, so that the inner pipe 3, the sleeve 8, and the pipe 4 can be controlled. It is possible to stabilize the coupling dimensions and the like.

  Further, since the joint between the tip of the pipe 4 and the inner pipe 3 is located closer to the accumulator body 1 than the welded portion of the accumulator body 1 and the pipe 4, the molten aluminum accompanying the welding enters the accumulator body 1. Outflow can also be suppressed, and deterioration in quality can be suppressed.

  Furthermore, by making the surface of the restricting portion 6 provided in the inner pipe 3 into a tapered shape, the processing becomes easy, and it is easy to ensure insertion and fitting with the sleeve 8 and the pipe 4 by the wedge action by the tapered surface. In addition, it is possible to suppress displacement of insertion and fitting during welding.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the welded portion of the accumulator according to Embodiment 2 of the present invention. FIG. 4 is a perspective view of a stainless steel sleeve in the accumulator of the second embodiment. Note that the same constituent elements as those of the first embodiment are denoted by the same reference numerals, and here, differences from the first embodiment will be mainly described.

  The sleeve 18 is formed of an austenitic stainless steel pipe (hereinafter referred to as a stainless steel pipe), and a flare portion 18a is formed at one end thereof so as to be inclined and spread outward. . The inclination angle of the flare portion 18a is set to be substantially the same as the angle of the tapered surface of the restricting portion 6.

  Here, as in the first embodiment, the sleeve 18 prevents the sleeve 18 from shifting and dropping, and minimizes the amount of aluminum that melts into the pipe during welding. The inner diameter is set to be substantially equal to the outer diameter of the insertion portion 5 of the inner pipe 3, and the outer diameter is set to a diameter that is extremely smaller than the inner diameter of the heat exchanger piping (hereinafter referred to as piping) 4.

  Also in the second embodiment, the accumulator is assembled by connecting the inner pipe 3 to the pipe 4 via the sleeve 18 and inserting the accumulator body 1 into the accumulator body 1. Hereinafter, the assembly of the accumulator will be described. To do.

  First, a stainless steel sleeve 18 is attached to the insertion portion 5 of the inner pipe 3. At this time, the sleeve 18 is inserted to a position where the end surface thereof abuts on the restriction portion 6 provided on the inner pipe 3. At that time, since the axial centers of the insertion portion 5 and the sleeve 18 can be aligned by utilizing the inclination of the spreading surface of the flare portion 18 a provided in the sleeve 18, the mounting operation of the sleeve 18 is facilitated.

  Then, by continuing the insertion of the sleeve 18 into the insertion portion 5, the position of the sleeve 18 is fixed by the contact between the flare portion 18 a and the restriction portion 6.

  Next, the inner pipe 3 fitted with the sleeve 18 is inserted into the inner periphery of the pipe 4. At this time, the pipe 4 is inserted until the tip of the pipe 4 comes into contact with the restriction portion 6 of the inner pipe 3 via the flare portion 18 a of the sleeve 18. In such a state, a force is applied so that the sleeve 8 also comes into contact with the restricting portion 6, so that no positional deviation occurs.

  Further, the inner pipe 3 and the pipe 4 connected through the sleeve 18 as described above are inserted so that the inner pipe 3 is positioned in the accumulator body 1. The insertion is performed until the contact portion 7 of the pipe 4 contacts the opening 2 of the accumulator body 1.

  And the welding assembly of an accumulator is completed by welding mainly the contact location in the state which the contact part 7 is contact | abutting to the opening part 2 of the accumulator main body 1. FIG.

  Here, in the above assembly, the sleeve 18 is attached to the insertion portion 5 of the inner pipe 3. However, the sleeve 18 is first attached to the inner periphery of the pipe 4, and in this state, the insertion portion 5 of the inner pipe 3 is attached. Can be inserted into the pipe 4.

  Even in such a case, since the axis of the insertion portion 5 and the sleeve 18 can be aligned using the inclination of the flare portion 18a formed in the sleeve 18, the mounting operation of the sleeve 18 is facilitated.

  In such assembly, the thickness of the aluminum material is ensured by the superposition structure of the accumulator body 1 and the pipe 4 during welding, so that the welding work can be facilitated, and the reworking or remanufacturing associated with poor welding is possible. Can be reduced. In addition, the use of an aluminum filler rod that is normally used during aluminum welding can be reduced, and a reduction in production cost can be expected.

  In particular, since the sleeve 18 forms a flared portion 18 a, the joint between the tip of the pipe 4 and the inner pipe 3 is located closer to the inside of the accumulator body 1 than the welded portion of the accumulator body 1 and the pipe 4. In addition, since the aluminum material melted at the time of welding is blocked by the flare portion 18a even if it tries to melt into the inner pipe 3 side, the outflow prevention of the molten aluminum material into the accumulator body 1 becomes more reliable. It is possible to further stabilize the quality.

  In addition, since refrigerant leakage due to poor welding can be reduced, the risk of ignition due to refrigerant leakage when using flammable refrigerants such as isobutane and propane can be reduced, increasing reliability. It is something that can be done.

  Furthermore, in the connection between the inner pipe 3 and the pipe 4 and the insertion of the pipe 4 into the accumulator main body 1, the force acting on the sleeve 18 acts in the direction in which the sleeve 18 abuts against the restricting portion 6 in any case. It is possible to suppress the position of the sleeve 18 from being shifted during assembly. That is, the restricting portion 6 provided on the inner pipe 3 restricts the position of the sleeve 18 and the pipe 4 in the insertion direction, and the coupling dimensions of the inner pipe 3, the sleeve 18, and the pipe 4 are the same as in the first embodiment. Can be stabilized. As a result, the fixing structure of the inner pipe 3, the sleeve 18 and the pipe 4 after welding is stabilized, reliability can be improved in securing the dimensions of the shape, etc., and the coolant can flow smoothly. is there.

  Further, the surface of the restricting portion 6 provided on the inner pipe 3 is tapered so that the processing is easy, and the tapered surface facilitates the axial alignment of the sleeve 18 and the inner pipe 3. Therefore, it is easy to secure the insertion and fitting, and it is possible to suppress the deviation of insertion and fitting during welding.

  Although the case where the sleeve 18 is formed of a stainless steel tube has been described, as in the first embodiment, a single stainless steel plate is press-molded, bent into a cylindrical shape, and the flare portion is press-formed. It can also be set as the structure which carried out. Therefore, the sleeve 18 in this case has a configuration having a slit in the longitudinal direction (opposite edge interval) continuous with the flare portion.

(Embodiment 3)
FIG. 5 is a perspective view of a stainless steel sleeve in the accumulator according to the third embodiment of the present invention. Note that the connection and incorporation of the accumulator main body, inner pipe, and heat exchanger pipe may be the same as those in the first embodiment, and therefore, description will be made mainly with a sleeve.

  The sleeve 28 is formed by pressing a single stainless steel plate and pressing the entire plate into a concavo-convex shape (corrugated), and then bending it so that the concavo-convex extends in the axial direction when it is formed into a cylindrical shape. .

  Therefore, the outer periphery of the sleeve 28 has a structure in which a convex portion 28a extending in the axial direction is formed, and a slit (a gap between opposing edges) 28b is formed in part.

  The sleeve 28 having the above-described configuration uses the same material as that of the first embodiment, has substantially the same dimensional relationship, and has the same mounting location, and has the structure shown in FIG. Therefore, in the following description, a part of FIG.

  The sleeve 28 is assembled in the same procedure as in the first embodiment, and finally the contact portion between the contact portion 7 of the pipe 4 and the opening portion 2 of the accumulator body 1 is welded.

  The difference from the first embodiment is that the pipe 4 is provided between the inner circumference of the heat exchanger pipe (hereinafter referred to as a pipe) 4 and the outer circumference of the inner pipe 3 because the convex portion 28a is formed. The minute gap 28c (FIG. 5) extending in the axial direction is formed.

  As a result, the contact area between the sleeve 28 and the pipe 4 is reduced, and the transfer of heat to the inner pipe 3 during welding is reduced. Therefore, in addition to the operational effects of the first embodiment, deformation due to heat during welding is suppressed, the inner pipe 3, sleeve 28, and piping 4 fixing structure is stabilized, and the reliability of the welding effect can be further enhanced. It can be done.

(Embodiment 4)
FIG. 6 is a perspective view of a stainless steel sleeve in the accumulator according to the fourth embodiment of the present invention. The connection and incorporation of the accumulator main body, inner pipe, and heat exchanger pipe may be the same as in the configuration of the second embodiment, and therefore, here, the sleeve will be mainly described.

  The sleeve 38 is formed from a stainless steel pipe (hereinafter referred to as a stainless steel pipe), and is formed by pressing in the radial direction and forming irregularities (corrugations) extending in the axial direction on the entire circumference. And the flare part 38a bent so that it may incline and spread in the outward direction may be formed in the end. The inclination angle of the flare portion 38a is set to be substantially the same as the angle of the tapered surface of the restricting portion formed on the inner pipe.

  Therefore, the sleeve 38 has a structure in which a protruding portion 38b extending in the axial direction is formed on the outer periphery in addition to the configuration in which the flare portion 38a is formed at one end.

  The sleeve 38 having the above-described configuration uses the same material as that of the second embodiment, has substantially the same dimensional relationship, has the same mounting location, and has the structure shown in FIG. Therefore, in the following description, a part of FIG.

  The sleeve 38 is assembled in the same procedure as in the second embodiment, and finally the contact portion between the contact portion 7 of the pipe 4 and the opening portion 2 of the accumulator body 1 is welded.

  The difference from the previous embodiment 2 is that the piping 4 is provided between the inner periphery of the heat exchanger piping (hereinafter referred to as piping) 4 and the outer periphery of the inner pipe 3 because the convex portion 38b is formed. The minute gap 38c (FIG. 6) extending in the axial direction is formed.

  As a result, the contact area between the sleeve 38 and the pipe 4 is reduced, and the transfer of heat to the inner pipe 3 during welding is alleviated. Therefore, in addition to the operational effects of the second embodiment, deformation caused by heat during welding is suppressed, the fixing structure of the inner pipe 3, the sleeve 38, and the pipe 4 is stabilized, and the reliability of the welding effect can be further enhanced. It can be done.

  The aluminum accumulator according to the present invention can sufficiently reduce welding defects and enables a smooth flow of refrigerant in the pipe. Therefore, in addition to refrigeration and refrigeration equipment mainly composed of aluminum and air conditioning equipment, it is used for automobile equipment and water heaters. It can also be applied to the use of equipment.

Sectional drawing of the welding part of the accumulator in Embodiment 1 of this invention The perspective view of the stainless steel sleeve in the accumulator of the embodiment Sectional drawing of the welding part of the accumulator in Embodiment 2 of this invention The perspective view of the stainless steel sleeve in the accumulator of the embodiment The perspective view of the sleeve made from stainless steel in the accumulator of Embodiment 3 of this invention The perspective view of the stainless steel sleeve in the accumulator of Embodiment 4 of this invention Sectional drawing which shows the welding structure of the pipe connection part in the conventional aluminum accumulator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Accumulator main body 2 Opening part 3 Inner pipe 4 Heat exchanger piping 5 Insertion part 6 Control part 7 Contact part 8 Sleeve 18 Sleeve 18a Flare part 28 Sleeve 28a Convex part 38 Sleeve 38a Flare part 38b Convex part

Claims (5)

  Aluminum accumulator body having pipe connection openings formed at diameters smaller than the center at both ends, an aluminum heat exchanger pipe inserted into one end of the accumulator body, and the heat exchanger pipe A stainless steel sleeve that is inserted into the accumulator body, and an aluminum inner pipe that has one end inserted into the heat exchanger pipe via the sleeve. An accumulator in which at least a restricting portion for restricting movement of the sleeve is provided, a heat exchanger pipe into which an inner pipe is inserted is inserted through the sleeve into an opening of the accumulator body, and the opening is welded.   The accumulator according to claim 1, wherein a taper portion formed by making a tip of the inner pipe smaller in diameter than a center portion is used as the restriction portion.   The accumulator according to claim 2, wherein a flare portion that contacts the tapered surface of the restriction portion is provided on an end surface of the sleeve on the restriction portion side.   The accumulator according to any one of claims 1 to 3, wherein unevenness extending continuously in an axial direction of the sleeve is provided on an outer peripheral surface of the sleeve.   Aluminum accumulator body having pipe connection openings formed at diameters smaller than the center at both ends, an aluminum heat exchanger pipe inserted into one end of the accumulator body, and the heat exchanger pipe A stainless steel sleeve that is inserted into the accumulator body, and an aluminum inner pipe that has one end inserted into the heat exchanger pipe via the sleeve. Provided with a restricting portion for restricting movement of the inner pipe and insertion allowance to the heat exchanger pipe, and further contacting the heat exchanger pipe in a radial direction and restricting the insert allowance to the accumulator body In the accumulator provided with a portion, the sleeve is inserted into the inner pipe until it comes into contact with the restricting portion. Insert the inner pipe into which the sleeve has been inserted into the heat exchanger pipe until the end of the heat exchanger pipe comes into contact with the restriction provided on the inner pipe, and connect the heat exchanger pipe from the inner pipe side. A method of assembling the accumulator, wherein the accumulator body is inserted until the abutting portion comes into contact with the opening, and the opening is welded in the inserted state.

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