KR20100000364A - Heat exchanger of cooling system - Google Patents

Abstract

PURPOSE: A heat exchanger of a cooling system is provided to increase cooling efficiency by preliminarily cooling the refrigerant before the refrigerant flows into an evaporator. CONSTITUTION: A heat exchanger of a cooling system comprises a compressor, a condenser, a capillary tube(30), an evaporator, a third connection pipe(31), a combining unit and an oxidation blocking unit. The condenser is connected through the compressor and a first connection pipe. The capillary tube is connected through the condenser and a second connection pipe. The capillary tube throttles the condensed refrigerant. The evaporator is connected to the capillary tube. The third connection pipe interlinks the evaporator and the compressor. Before the condensed refrigerant from the condenser flows in into the evaporator, the Refrigerant is frozen preliminarily. The combining unit contacts the capillary tube and the third connection pipe. The oxidation blocking unit is coated on the outer circumference of the capillary tube. The oxidation blocking unit prevents the capillary tube from being oxidized.

Description

Freezer {Heat exchanger of cooling system}

The present invention relates to a refrigerating device, and more particularly, to a refrigerating device that can increase the cooling efficiency in the evaporator by cooling before the refrigerant is introduced into the evaporator.

In the refrigerant circulation refrigeration system, the refrigerant circulates in a closed circuit including a compressor, a condenser, an expander, and an evaporator. That is, the refrigerant on the low pressure gas is compressed in the compressor and then transferred to the condenser on the high pressure gas, where it is condensed into the liquid phase by releasing heat. The condensed refrigerant is expanded under reduced pressure through an expander and supplied to the evaporator, and the refrigerant absorbs heat from the outside in the evaporator, evaporates, and then returns to the compressor.

In the evaporator, cooling is performed by lowering the temperature around the evaporator through the heat of vaporization absorbed when the refrigerant is evaporated. The lower the temperature of the refrigerant flowing into the evaporator, the higher the cooling efficiency. It is necessary to perform cooling.

In order to satisfy the above needs, the refrigerating device disclosed in Korean Patent No. 2001-0060533 includes a compressor 110 for compressing a refrigerant, a condenser 130 for condensing the compressed refrigerant, and as shown in FIG. 6. The evaporator 230 for evaporating the refrigerant, the expander 150 for depressurizing and expanding the refrigerant flowing from the condenser 130 toward the evaporator 230, the refrigerant exiting the expander 150 and the refrigerant exiting the evaporator 230 It consists of an internal heat exchanger 170 for mutual heat exchange. The internal heat exchanger 170 includes a casing 190, a thermally conductive coil conduit 210 through which refrigerant discharged from the condenser 130 passes is accommodated in the casing 190, and the casing 190 includes an evaporator. An inlet port 190a and an outlet port 190b through which the refrigerant from the 230 flows in and out are provided.

However, the refrigerating device according to the prior art as described above requires an additional internal heat exchanger consisting of a casing and a coil conduit in addition to the compressor, the condenser, the evaporator, and the expander, which are essential components of the cycle, so that the structure of the device is complicated. Not only does this increase, but also it is difficult to realize compactness of the device, and the practicality is significantly reduced.

The present invention is to solve the above problems, it is possible to increase the cooling efficiency of the cooling system through the pre-cooling of the refrigerant before entering the evaporator, heat exchange between the condensed refrigerant and the vaporized refrigerant in the evaporator can be easily made The object is to provide a refrigeration apparatus.

The present invention provides a compressor for compressing a refrigerant, a condenser connected by the compressor and the first connecting pipe to condense the compressed refrigerant, a capillary tube connected by the condenser and the second connecting pipe, and condensed refrigerant, and A refrigeration apparatus having an evaporator connected to the capillary tube and a third connecting tube interconnecting the evaporator and the compressor, wherein the condensed refrigerant discharged from the condenser may be precooled before being introduced into the evaporator. Coupling means for coupling the capillary tube and the third connecting tube in contact, and the anti-oxidation means is coated on the outer peripheral surface of the capillary tube to prevent the capillary tube from being oxidized.

Preferably, the coupling means is formed by welding the capillary tube and the third connection tube to each other, and the antioxidant means is tin plated.

The capillary tube and the third connecting tube are formed of an aluminum material, and the coupling means is selected from the capillary tube or the third connecting tube with a lower melting point than the base material forming the capillary tube or the third connecting tube. It is provided on one side and is made through brazing for coupling the capillary tube and the third connector tube in contact with the capillary tube and the third connector tube by heating and solidifying the melted material in contact with the third connector tube. It may be.

A refrigeration apparatus according to the present invention comprises a compressor for compressing a refrigerant, a condenser connected by the compressor and a first connection pipe and condensing the compressed refrigerant, and a condensed refrigerant connected by the condenser and a second connection pipe. And a capillary tube, an evaporator connected to the capillary tube, and a third connecting tube connecting the evaporator and the compressor to each other. The capillary tube and the third connecting tube may be formed of an extruded tube having a single body.

In this case, the extrusion tube is preferably further provided with a heat insulating coating layer coated on the outer circumferential surface to block heat exchange between the refrigerant passing through the inner flow path and the outside air.

The refrigeration apparatus according to the present invention can increase the cooling efficiency by pre-cooling the refrigerant before it is introduced into the evaporator, it can be relatively simple and easy to manufacture.

Hereinafter, with reference to the accompanying drawings will be described in more detail the refrigerating device 100 according to the present invention.

1 to 3 show a first embodiment of the refrigerating device 100 according to the present invention.

The refrigerating device 100 includes a compressor 10 for compressing a refrigerant, a condenser 20 for condensing the compressed refrigerant, a capillary 30 for throttling the refrigerant, and an evaporator 40 for evaporating the refrigerant. do.

The compressor 10 and the condenser 20 are connected by the first connecting pipe 11, and the refrigerant on the high pressure gas compressed by the compressor 10 flows into the condenser 20 through the first connecting pipe 11. do.

In the condenser 20 to dissipate heat of the introduced refrigerant, the refrigerant is condensed in the liquid phase in the condenser 20.

The refrigerant condensed in the condenser 20 is connected to the capillary tube 30 through the second connecting tube 31. Since the capillary tube 30 has a smaller inner diameter than the second connecting tube 31, the refrigerant is the capillary tube 30. The expansion under reduced pressure is made to pass through the evaporator 40 has a condition that can be easily evaporated.

The evaporator 40 cools the surroundings through the heat of vaporization when the refrigerant is vaporized. The refrigerant evaporates in the evaporator 40 and then moves to the compressor 10 through the third connecting pipe 31. After again compressed in the) it is to cool the surroundings of the evaporator 40 by repeating the same process described above.

The accumulator 50 is installed on the flow path of the third connection pipe 31 to block the liquid refrigerant contained in the refrigerant discharged from the evaporator 40 directly into the compressor 10. If the liquid refrigerant that is not vaporized into the compressor 10 is introduced, it may cause a failure of the compressor 10 during the compression process in the compressor 10, so that only the refrigerant vaporized through the accumulator 50 is compressed in the compressor 10. It is preferable to let it flow in.

The capillary tube 30 and the third connecting tube 31 of the present embodiment are aluminum tubes. Aluminum belongs to a metal having a relatively good thermal conductivity, and although the thermal conductivity is slightly lower than that of copper, it is easy to manufacture, light, and low in price. In addition, since aluminum has good moldability, capillaries can be easily formed through drawing as in the case of the present embodiment.

In addition, the capillary tube 30 and the third connection tube 31 are coated with an anti-oxidation means 32 on the outer circumferential surface of the capillary tube 30 and the third connecting tube 31 to prevent corrosion. 3 The outer circumferential surface of the connecting pipe 31 is tin plated.

In particular, in the case of the capillary tube 30, the diameter is small, and because the thickness of the tube wall is thin, if damage occurs due to corrosion, the refrigerant may leak, which may cause the refrigeration efficiency of the refrigerating device 100 to decrease sharply. . Therefore, tin plating treatment is performed to prevent corrosion.

In the present embodiment, the capillary 30 and the third connecting tube 31 are tin-plated, but other types of plating or coating layers may be formed to prevent corrosion.

Some sections of the capillary tube 30 are welded to contact the outer circumferential surface of the third connecting tube 31. As described above, the lower the temperature of the refrigerant flowing into the evaporator 40, the more the vaporization heat is absorbed when the evaporation is performed, so that the cooling efficiency can be improved, and thus the refrigerant passing through the capillary tube 30 and the evaporator 40 The heat exchange is performed between the refrigerant moving to the compressor 10 to increase the cooling efficiency of the refrigerating device 100.

Arc welding using an inert gas is applied to the capillary tube 30 and the third connecting tube 31. Since the aluminum forming the capillary tube 30 and the third connector tube 31 has a high specific heat and thermal conductivity, a high temperature heat source is required to increase the welding temperature in a short time. In addition, aluminum has a relatively low melting point, and it is difficult to determine the heating temperature depending on the color, and thus it is easy to be excessively fused. The aluminum oxide formed by the reaction of aluminum and oxygen has a very high melting point compared to the melting point of aluminum. Therefore, the welding operation is not easy because the fluidity is impaired without melting, and the operation is greatly impaired, such as covering the aluminum surface to prevent fusion between metals.

Therefore, an inert gas capable of suppressing the formation of aluminum oxide is used as a protective gas, and is bonded through an inert gas arc welding that generates an arc by flowing a high frequency current.

Of course, the coupling of the capillary 30 and the third connector 31 may be welded through a variety of welding methods in addition to this.

Since the capillary tube 30 and the third connector 31 are joined by welding, the possibility that the coupling between the capillary tube 30 and the third connector 31 is released by external factors such as vibration or impact is minimized. can do. In particular, in the contact section where the outer circumferential surface is in contact with each other by welding, the heat exchange between the refrigerant flowing into the evaporator 40 and the refrigerant discharged from the evaporator 40 is continuously maintained, thereby maintaining the refrigerating efficiency of the refrigerating device 100 continuously. Can be.

The coupling of the capillary 30 and the third connector 31 may be made by brazing in addition to welding.

Brazing is also known as brazing. One side of the capillary tube 30 or the third connecting tube 31 is treated with a filler material having a lower melting point than that of the base metal aluminum, and then heated to melt the filler material. After the molten filler metal is cooled, the capillary tube 30 and the third connecting tube 31 are coupled by the filler metal.

Because of the high technology required for welding due to the characteristics of aluminum, the capillary tube 30 and the third connector 31 may be easily coupled to each other through the brazing method.

4 and 5 show a second embodiment of the refrigerating device according to the invention.

The refrigeration apparatus of the present embodiment is a single-body extruded tube 60 is provided with the refrigerant discharged from the evaporator 40 and the first and second flow paths 61 and 62 through which the refrigerant flowing into the evaporator 40 can move, respectively. It includes.

The extruded tube 60 extends a predetermined distance, and the first passage 61 and the second passage 62 are adjacent to each other and extended in parallel with each other, and both ends of the extension 64. It includes an expansion unit 65 provided.

The extension 64 is formed such that the first and second flow paths 61 and 62 through which the refrigerant discharged from the evaporator 40 and the refrigerant flowing into the evaporator 40 move, respectively, are adjacent to each other, and heat transfer is easy. Since it is made of aluminum, heat exchange is performed between the refrigerant passing through the first and second flow paths 61 and 62, and the refrigerant flowing into the evaporator 40 may be precooled.

Extension portion 65 is formed on both ends of the extension portion 64 as described above, one side expansion portion 65 is discharge pipe extending from the evaporator 40 so that the refrigerant discharged from the evaporator 40 can move 71 and an inlet tube 72 extending to the inlet of the evaporator 40 so that the refrigerant flowing into the evaporator 40 moves, respectively, and the other extension 65 is extended to the compressor 10. The discharge tube 73 and the capillary tube 74 connected to the second extension tube extending from the condenser 20 are fitted.

If the length of the extension portion 64 is long enough to throttle the refrigerant, a second extension tube extending from the condenser 20 is fitted into the extension portion 65, and the inner diameter of the second flow path 62 is changed into the refrigerant. It may be formed so small that the throttling can be made to expand the refrigerant under reduced pressure in the extrusion tube (60) without a separate capillary (74).

The refrigeration apparatus of the present embodiment can be easily made inside the extruded tube 60 which is a heat exchange between the refrigerant, the installation is very simple only by fitting the pipes connected to both ends of the extruded tube 60. It is easy.

In addition, the outer circumferential surface of the extruded tube 60 is coated with a heat insulating coating layer (63). Insulating coating layer 63 of the present embodiment is a synthetic resin is formed by insert injection to surround the extrusion tube (60).

The insulation coating layer 63 is to block heat exchange between the extruded tube 60 and the outside air, and the heat exchange is performed only between the refrigerant passing through the first and second flow paths 61 and 62.

Insulating coating layer 63 is not limited to this embodiment may be formed of various coating layers that can block the heat exchange between the extrusion tube 60 and the outside air.

The remaining components constituting the refrigerating device of the present embodiment are the same as those of the refrigerating device of the first embodiment, so the same reference numerals are omitted and detailed description thereof will be omitted.

1 is a block diagram showing an embodiment of a refrigeration apparatus according to the present invention,

FIG. 2 is a perspective view illustrating a coupling state of the capillary and the third connector of FIG. 1;

3 is a cross-sectional view showing the capillary and third connector of FIG.

Figure 4 is a partial excerpt perspective view showing an extruded tube according to the present invention,

5 is a cross-sectional view showing a coupling state of the extruded tube and the capillary and discharge tube of FIG.

6 is a view showing an embodiment of a conventional refrigeration apparatus.

Claims (6)

A compressor for compressing a refrigerant, a condenser connected by the compressor and a first connection tube to condense the compressed refrigerant, a capillary tube connected by the condenser and a second connection tube, and condensed refrigerant, and a capillary tube; A refrigeration apparatus having an evaporator connected to each other, and a third connecting pipe interconnecting the evaporator and the compressor. Coupling means for coupling the capillary tube and the third connecting tube to be in contact with each other so that the condensed refrigerant discharged from the condenser is precooled before being introduced into the evaporator; And an antioxidant means coated on an outer circumferential surface of the capillary tube to prevent the capillary tube from being oxidized. The method of claim 1, The coupling means is a refrigerating device, characterized in that the capillary tube and the third connecting tube is welded to each other. The method of claim 1, The oxidation preventing means is a refrigeration apparatus, characterized in that the tin plating. The method of claim 1, The capillary and the third connecting tube is formed of an aluminum material, In the coupling means, a filler metal having a lower melting point than the base material forming the capillary tube or the third connecting tube is provided on one side selected from the capillary tube or the third connecting tube, and the capillary tube and the third connecting tube contact each other. And a brazing unit for coupling the capillary tube and the third connector tube in a contacted state by heating the filler metal in a solid state to be melted and then solidifying. A compressor for compressing a refrigerant, a condenser connected by the compressor and a first connection tube to condense the compressed refrigerant, a capillary tube connected by the condenser and a second connection tube, and condensed refrigerant, and a capillary tube; A refrigeration apparatus having an evaporator connected to each other, and a third connecting pipe interconnecting the evaporator and the compressor. The refrigerating device, characterized in that the capillary tube and the third connecting tube made of an extruded tube of a single body. The method of claim 5, The extruded tube further comprises a heat insulation coating layer coated on the outer circumferential surface to block heat exchange between the refrigerant passing through the inner passage and the outside air.

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