KR100701983B1 - Heat exchager and air conditioner for vehicle thereby - Google Patents

Abstract

The present invention relates to a heat exchanger and a vehicle air conditioner using the same, by using a high heat source of cooling water passing through a heater core to superheat the refrigerant gas discharged from the evaporator to supply to the compressor to improve the compression efficiency of the compressor. In addition, the compressor can be protected, the heater core and the accumulator can be integrated to simplify components and reduce costs, and the evaporator can be compacted by eliminating overheating of the evaporator. .

The apparatus according to the present invention comprises an evaporator (3) installed in the air passage of the air conditioning case (1) and cooling the room through heat exchange between the refrigerant and the inlet air, and installed in the air passage and between the engine coolant and the inlet air. An air conditioner for automobiles comprising a heater core (4) for heating a room through heat exchange of the vehicle, comprising: the evaporator (3) and the heater core (4) integrally formed to form an integrated heat exchanger; An accumulator (6) installed at one side of the heater core (4) for vaporizing the refrigerant from the evaporator (3) and delivering it to the compressor (51); The refrigerant inlet 62 of the accumulator 6 and the refrigerant outlet 36 of the evaporator 3 are connected to each other, and the refrigerant outlet 63 of the accumulator 6 is connected to the compressor 51. It is characterized by.

Refrigerant evaporation, refrigerant overheat, air conditioning, air conditioning, heat exchanger, air conditioner, air conditioner

Description

Heat exchanger and automotive air conditioner using same {HEAT EXCHAGER AND AIR CONDITIONER FOR VEHICLE THEREBY}

1 is a front view showing an example of an evaporator constituting the air conditioner according to the first embodiment of the present invention.

2 is an exploded perspective view of the flat tube constituting the evaporator shown in FIG.

3 is a perspective view showing a heater core constituting the air conditioner according to the first embodiment of the present invention.

4 is a front view showing a partial cross section of the heater core shown in FIG.

5 is a partially enlarged cross-sectional view of FIG. 5.

6 is a perspective view showing a refrigerant flow path of the air conditioner according to the first embodiment of the present invention.

7 is a configuration diagram showing an air conditioner according to Embodiment 1 of the present invention.

8 is a cross-sectional view showing an evaporator constituting an air conditioner according to a second embodiment of the present invention.

9 is a perspective view illustrating a refrigerant flow path of the air conditioner according to the second embodiment of the present invention.

10 is a front view showing an integrated heat exchanger constituting the air conditioner according to the third embodiment of the present invention.

11 is a perspective view showing a refrigerant flow path of the air conditioner according to the third embodiment of the present invention.

12 is a cross-sectional view showing an air conditioner according to a third embodiment of the present invention.

13 is a front view showing an integrated heat exchanger constituting the air conditioner according to the fourth embodiment of the present invention.

14 is a perspective view showing a refrigerant flow path of the air conditioner according to the fourth embodiment of the present invention.

15 is a cross-sectional view showing an air conditioner according to a fourth embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: air conditioning case, 3: evaporator,

4: heater core, 6: accumulator,

35: refrigerant inlet of the evaporator, 36: refrigerant outlet of the evaporator,

41: tube of heater core, 42: heating fin of heater core,

43: upper tank, 44: lower tank,

51: compressor, 55: connector,

61: O-ring, 62: refrigerant inlet of the accumulator,

63: refrigerant outlet of the accumulator, 64: mesh filter,

65: hole cup for refrigerant flow path, 71: flat tube of evaporator,

72: plate of the evaporator, 73: heating fin,                 

81: flat tube of the heater core, 82: plate of the heater core,

441: beads, 721, 722: hole cup of the evaporator,

821, 822: Hole Cup of Evaporator

The present invention relates to a heat exchanger and an air conditioner for automobiles using the same, and in particular, by allowing the refrigerant gas discharged from the evaporator to pass through the heater core, the refrigerant gas flowing into the compressor does not include liquid refrigerant, thereby increasing compressibility. The present invention relates to a heat exchanger capable of protecting a compressor and an automobile air conditioner using the same.

The air conditioner for automobiles receives refrigerant compressed by the compressor driven by the engine's power into the condenser, heat exchanges by forced air of the cooling fan, and then passes through the receiver dryer, the expansion valve, and the evaporator, and then flows back into the compressor. A device for cooling the interior of the vehicle by inflowing air blown by a blower installed at the inlet end of the air conditioning case to the refrigerant passing through the evaporator and entering the room in a cold state; In the process of returning the engine cooling water to the engine through the heater core, the air blown by the blower heats up with the cooling water passing through the heater core and enters the room in a warm state, thereby heating the interior of the vehicle.                         

In such a cooling system, the expansion valve generally serves to control the degree of superheat appropriate to the refrigerant from the condenser and send it to the evaporator in the gas-liquid mixed state. If the refrigerant introduced into the evaporator through the expansion valve is not completely vaporized and some refrigerant is introduced into the compressor in the liquid phase, liquid refrigerant compression may occur and the compressor may be greatly damaged. In particular, in an air-conditioning combined heat pump, When the temperature is low, the refrigerant temperature is also low, so the liquid refrigerant may be introduced into the compressor. For this reason, an excessive overheating section is formed at the outlet end of the evaporator. However, this section acts as a loss section, and as a result, the evaporator efficiency is lowered.

Accordingly, the present inventors consider that in recent years, a center type or semi-center type air conditioner in which an evaporator and a heater core are installed in a line is mainly used, and an integrated heat exchanger in which the evaporator and the heater core are integrally proposed is also considered. It has been developed an air conditioner that can improve the refrigerant evaporation performance by overheating the refrigerant using a heat source of the cooling water passing through the heater core.

An object of the present invention is to improve the compression efficiency of the compressor and to protect the compressor by superheating the refrigerant gas discharged from the evaporator using a high heat source of cooling water passing through the heater core to the compressor.

Another object of the present invention is to simplify the components and reduce the cost by integrating the heater core and the accumulator, as well as to compact the evaporator by eliminating the overheating section of the evaporator.

In order to achieve the above object, the air conditioner according to the present invention, an evaporator installed in the air passage of the air conditioning case and cooling the room through heat exchange between the refrigerant and the inlet air, installed in the air passage and the engine coolant and An air conditioner for an automobile comprising a heater core for heating a room through heat exchange between inlet air, comprising: the evaporator and the heater core integrally formed to form an integrated heat exchanger; An accumulator installed on one side of the heater core to vaporize the refrigerant from the evaporator and transfer the refrigerant to the compressor; The refrigerant inlet of the accumulator and the refrigerant outlet of the evaporator are connected to each other, and the refrigerant outlet of the accumulator is connected to the compressor.

According to the present invention, it is preferable that a mesh filter is installed at the inner center of the accumulator.

According to the air conditioner for automobiles according to the present invention configured as described above, the refrigerant introduced into the evaporator is evaporated by heat exchange with the blowing air in the course of passing through the internal flow path of the evaporator, the refrigerant evaporated as described above evaporator and air It is introduced into the accumulator through a connection pipe connecting the cumulator. The refrigerant introduced into the accumulator is overheated by heat exchange with cooling water of about 100 ° C. which is significantly higher than the evaporation temperature of the refrigerant in the course of passing through the accumulator. Therefore, the refrigerant that has passed through the accumulator is converted into a gaseous phase containing no liquid refrigerant and is supplied to the compressor, thereby not only improving the compression efficiency of the compressor but also protecting the compressor since liquid refrigerant compression does not occur. As the mesh filter is installed inside the accumulator, the refrigerant impinges on the mesh filter due to the flow rate of the refrigerant gas, thereby facilitating atomization of the refrigerant, that is, overheating of the refrigerant.                     

Other features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments based on the accompanying drawings.

<Example 1>

An air conditioner according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 7.

As illustrated in FIG. 7, a blower 2 is installed at an inlet end of the air conditioner case 1. Therefore, the inside of the air conditioning case 1 serves as a blow passage for the air blown by the blower 2, and the evaporator 3 and the heater core 4 are sequentially installed before and after the blow passage.

In Example 1, the evaporator 3 is a stacked evaporator. That is, the evaporator 3 has two plates 32 in which a pair of hole cups 321 and 321 are formed at the bottom and a U-turn flow path 323 is formed by the partition beads 322 as shown in FIGS. 1 and 2. A plurality of flat tubes 31, to which 32 is joined, and a plurality of heat transfer fins 33 are alternately stacked. The coolant inlet 35 and the coolant outlet 36 are preferably installed at predetermined positions before and after the lower end of the evaporator 3.

Accordingly, the refrigerant flowing into the refrigerant inlet 35 through the expansion valve 54 (see FIG. 7) passes through a predetermined flow path formed by the flat tubes 31 of the evaporator 3. Heat exchanged with the air blown by the evaporation is discharged through the refrigerant outlet (36). On the other hand, the air exchanged with the refrigerant flowing in the evaporator (3) is converted into cold air through the defrost vent 11, the air conditioning vent 12 and the foot vent 13 installed at the outlet of the air conditioning case (1) It is used for cooling a car by supplying it to a car interior.

Although not shown, in the first embodiment, an evaporator in which tubes and heating fins are alternately stacked between the upper header pipe and the lower head pipe in addition to the above-described stacked evaporator may also be used. At the position, the refrigerant inlet and the refrigerant outlet are sequentially installed.

Meanwhile, as illustrated in FIGS. 3 and 4, the heater core 4 has a plurality of tubes 41 and a plurality of heating fins 42 alternately stacked, and the upper and lower ends of the tubes 41 are disposed at the same. Tanks 43 and 44 are sequentially installed so as to communicate with internal channels of the tubes 41. One of the tanks 41 and 42 is provided with a coolant inlet 45 and a coolant outlet 46 in order (in this case, the coolant inlet 45 and the coolant outlet 46 are installed in the upper tank 43, for example). Shown as).

Accordingly, the coolant discharged from the engine and introduced into the coolant inlet 45 passes through a predetermined flow path formed by the tanks 43 and 44 and the tubes 41 of the heater core 4. Heat exchanged with the air blown by the air is cooled and discharged through the coolant outlet 46 to return to the engine, thereby cooling the engine. On the other hand, the air heat-exchanged with the coolant is converted to warmth and supplied to the vehicle interior through the vents 11, 12, 13 of the air conditioning case 1 is used for heating the vehicle.

According to the first embodiment, the refrigerant gas overheating section of the evaporator 3, that is, the loss section is eliminated, and the refrigerant gas discharged from the evaporator 3 is effectively overheated to supply only the gaseous refrigerant containing no liquid refrigerant to the compressor 51. In order to improve the compression efficiency of the compressor 51 and to protect the compressor 51, the refrigerant gas discharged from the evaporator 3 is exchanged with the cooling water passing through the heater core 4.

To this end, in the first embodiment, the accumulator 6 is coupled to the lower end of one tank (here, the lower tank 44) of the heater core 4. The accumulator 6 is open at the upper end and the opening is coupled to the lower tank 44 of the heater core 4 so that the internal space of the accumulator 6 can act as a flow path. Specifically, as shown in FIGS. 4 and 5, the bead 441 protrudes around the outer circumferential surface of the lower tank 44 of the heater core 4, and the open edge portion of the accumulator 6 is formed. By bending to hold the beads 441, the accumulator 6 may be coupled to the heater core 4 such that the accumulator 6 is not separated from the heater core 4. The accumulator 6 and the heater are interposed between the concave portion formed below the bead 6 by the bead 6 and the inner surface of the open bent portion of the accumulator 6. The engagement with the lower tank 44 of the core 4 can be maintained firmly and the liquid tightness of this engagement can be maintained.

The coolant inlet 62 and the coolant outlet 63 are sequentially provided at both ends of the accumulator 6. Here, a coolant inlet 62 is provided at the left side of the accumulator 6 and a coolant outlet 63 is provided at the front of the right side of the accumulator 6. In addition, the mesh filter 64 may be further provided at an inner center of the accumulator 6, which is a position between the refrigerant inlet 62 and the refrigerant outlet 63 of the accumulator 6.

According to the first embodiment, the refrigerant outlet 36 of the evaporator 3 and the refrigerant inlet 62 of the accumulator 6 are connected by a connecting tube 55 (see FIG. 7) to communicate with each other. The refrigerant discharge port 63 of the cumulator 6 is connected to the compressor 51.

Next, the operation of the air conditioner according to the first embodiment of the present invention configured as described above will be described.

When the compressor 51 is driven, the refrigerant compressed and discharged by the compressor 51 passes through the condenser 52, the receiver dryer 53, and the expansion valve 54, as shown in FIG. 7. Inflow to the inlet (35). The refrigerant introduced into the evaporator (3) is exchanged with the air blown by the blower (2) in the course of passing through the internal flow path of the evaporator (3) begins to evaporate and discharged through the refrigerant outlet (36) of the evaporator (3) Almost changes to gaseous state. Since the gaseous refrigerant contains a small amount of liquid refrigerant, when it is supplied to the compressor 51 as it is, there is a possibility that a liquid compression phenomenon may occur, which may cause noise and damage to the compressor 51. The discharged refrigerant gas flows into the accumulator 6 provided with the connecting pipe 55 in the heater core 4, and the refrigerant flows through the accumulator 6 to the accumulator 6. In the process of being discharged through the refrigerant outlet 63, the heat exchange with the cooling water of about 100 ℃ significantly higher than the evaporation temperature of the refrigerant is overheated. Therefore, the refrigerant passing through the accumulator 6 is converted into a gaseous phase containing no liquid refrigerant and is supplied to the compressor 51, so that the compression efficiency of the compressor 51 is not only improved, but the liquid refrigerant compression phenomenon does not occur and the compressor 51 ) Can be protected. As the mesh filter 64 is installed inside the accumulator 6, the refrigerant may collide with the mesh filter 64 due to the flow rate of the refrigerant gas, thereby promoting overheating of the refrigerant.                     

<Example 2>

An air conditioner according to a second embodiment of the present invention will be described with reference to FIGS. 8 and 9. For convenience, the elements corresponding to the first embodiment are denoted by the same reference numerals.

In the air conditioner according to the second embodiment, a plurality of flat tubes 31 and two heat transfer fins 33, to which two plates 32 and 32 having a pair of hole cups 321 and 321 are formed, respectively, are formed at the top and the bottom thereof. The evaporator 3 of the form which is laminated | stacked alternately is applied. In the evaporator 3, a coolant inlet 35 and a coolant outlet 36 are provided at one end plate 32. The refrigerant outlet 36 of the evaporator 3 is connected to the refrigerant inlet 62 of the accumulator 6 provided in the heater core 4 (see FIGS. 3 to 5) by a connecting pipe 55.

In Embodiment 2, the rest of the configuration and operation are the same as in Embodiment 1 described above.

<Example 3>

An air conditioner according to a third embodiment will be described with reference to FIGS. 10 to 12. In Example 3, the same code | symbol is attached | subjected about the same part as Example 1 mentioned above, and the detailed description here is abbreviate | omitted.

According to the third embodiment, the blower flow passage of the air conditioner case 1 is provided with an integrated heat exchanger 7 in which the evaporator 3 and the heater core 4 are integrally connected.

The integrated heat exchanger (7) is an evaporator (3) in which a plurality of flat tubes (71) in which two L-shaped plates (72, 72) are joined are sequentially stacked, and is installed in the space of the L-shaped evaporator ( By connecting the respective flat tubes 71 of 3), the heater core 4 in which a plurality of flat tubes 81, which are generally formed in a quadrangular flat shape together with the flat tubes 71 of the evaporator 3, are sequentially stacked Have The evaporator 3 and the heater core 4 share the heat transfer fins 73, and a notch 74 is installed to block heat transfer between the evaporator 3 and the heater core 4.

A first hole cup 721, a second hole cup 722, and a third hole cup 723 are sequentially formed at the lower end of each plate 72 of the evaporator 3, and an upper end of the evaporator 3 is formed from the central second hole cup 722. The L-shaped partition bead 724 is formed to a portion of the bent portion of the L-turn flow path is formed on the inner surface of each plate (72). In addition, two hole cups, that is, the first hole cup 721 and the second hole cup 722 of the hole cups formed in one end plate 72 of the evaporator 3, are the same as the refrigerant inlet 35 of the first embodiment. It acts in turn to the refrigerant discharge port 36, the other one third hole cup 723 is blocked. Then, a predetermined flow path can be formed inside the evaporator 3 by forming a baffle by properly blocking the hole cups of the plate located at a predetermined place among the plates 72 constituting the evaporator 3. For example, as shown in FIG. 11, the first hole cup 721 of the central plate 72 of the evaporator 3 is blocked, and the third hole cup 723 of the other end plate 72 of the evaporator 3 is closed. When the first hole cup 721 and the second hole cup 722 are blocked and communicated with each other, the inside of the evaporator 3 through the refrigerant inlet 35 (that is, the first hole cup 721 of the left end plate). The introduced refrigerant may flow through the second hole cups 722 after two L turns, and then be discharged through the refrigerant outlet 36 (that is, the second hole cup 722 of the left end plate).                     

On the other hand, it is preferable that each flat tube 81 constituting the heater core 4 is made by joining two plates 82 and 82 formed in a substantially rectangular shape similarly to the evaporator 3. At the lower end of each plate 82, two hole cups 821 and 822 are formed side by side, and the two hole cups 821 and 822 of one end plate 82 of the heater core 4 have the same coolant inlet as in the first embodiment. 45) and cooling water outlet 46. In addition, a partition bead 823 is formed from the two hole cups 821 and 822 to the upper end of the plate 82 so that each plate 82 constituting the heater core 4 is formed with a U-turn flow path, and the heater core 4 is formed. Since the hole cups of the plates located at a predetermined place among the plates 82 forming the baffles are properly blocked to form a baffle, a predetermined cooling water flow path may be formed inside the heater core 4.

According to the third embodiment, the lower surface of each plate 82 of the heater core 4 is integrally extended with a hole for the refrigerant flow hole cup 65 formed to be partitioned from the hole cups 821 and 822 of the heater core 4. Therefore, as the plates 82 of the heater core 4 are joined in turn, the coolant flow path hole cups 65 are also joined in turn so that the coolant flow path hole cups 65 are fluidized through the inside thereof as in the first embodiment. To form an accumulator 6 through which flow can flow. In addition, the refrigerant passage hole cups 65 at one end of the refrigerant passage hole cups 65 forming the accumulator 6 function as the refrigerant inlet 62 as in the first embodiment, and at the other end. The refrigerant passage hole cup 65 serves as the refrigerant outlet 63 as in Embodiment 1, and the refrigerant passage hole cup 65 serving as the refrigerant inlet is connected to the hole cup serving as the refrigerant outlet of the evaporator 3. The hole cup 65 for the refrigerant flow path, which is connected by a pipe and serves as a refrigerant outlet, is connected to the compressor 51.

Therefore, the refrigerant evaporated and discharged by the heat exchange with the air blown by the blower 2 in the course of passing through the evaporator 3 is passed through the connection pipe 55 and the refrigerant flow hole inlet hole cup 65. The refrigerant may be introduced into the accumulator 6 and may be heat-exchanged with the cooling water passing through the heater core 4 to be overheated and supplied to the compressor 51 in a gaseous refrigerant state containing no liquid refrigerant.

Although not shown, according to the third embodiment, in at least one refrigerant passage hole cup 65 positioned in the center of the refrigerant passage hole cups 65, the overheating of the refrigerant may be promoted. It is preferable that a mesh filter 64 is installed.

<Example 4>

13 to 15, an air conditioner according to a fourth embodiment of the present invention will be described.

In the air conditioner according to the fourth embodiment, two hole cups 721 and 722 are formed at the lower end of the plate 72 constituting the evaporator 3 according to the third embodiment, and the plate constituting the evaporator 3. Two hole cups 721 and 722 of one end plate 72 of 72 serve as the coolant inlet 35 and the coolant outlet 36 as in the first embodiment, and the coolant outlet 35 of the evaporator 3. (I.e., the hole cup 722) is connected to the refrigerant cup hole cup 65 serving as the refrigerant inlet of the accumulator 6 installed in the heater core 4 by the connecting pipe 55. Since the rest of the configuration and operation are the same as in the above-described third embodiment, the same parts as in the above-described third embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

In the air conditioner capable of improving the refrigerant evaporation performance according to the present invention configured as described above, the evaporator (3) while evaporating by heat exchange with the air blown by the blower (2) in the course of passing through the evaporator (3). The refrigerant discharged from the heat exchanger is supplied to the compressor 51 in a superheated state by exchanging heat with the cooling water passing through the heater core 4 and having a temperature higher than the evaporation temperature thereof. Since it can be supplied to the 51, the compression efficiency of the compressor 51 is improved, not only to improve the cooling performance and reduce fuel, but also to prevent the liquid compression of the compressor 51 to prevent damage to the compressor 51 Can be.

In addition, since the accumulator 6 is integrally installed on the heater core 4, cost reduction and installation space can be secured due to the simplification of components, and the superheat section of the refrigerant is eliminated in the evaporator 3. As a result, the evaporator 3 can be made compact.

Claims (9)

An evaporator (3) installed in the air passage of the air conditioner case (1) and cooling the room through heat exchange between the refrigerant and the inlet air, and the room heated by the heat exchange between the engine coolant and the inlet air. In the automotive air conditioner comprising a heater core (4), The evaporator 3 and the heater core 4 are integrally formed to constitute an integrated heat exchanger; An accumulator (6) installed at one side of the heater core (4) for vaporizing the refrigerant from the evaporator (3) and delivering it to the compressor (51); The refrigerant inlet 62 of the accumulator 6 and the refrigerant outlet 36 of the evaporator 3 are connected to each other, and the refrigerant outlet 63 of the accumulator 6 is connected to the compressor 51. Automotive air conditioner, characterized in that. The method of claim 1, The heater core 4 is formed by alternately stacking a plurality of tubes 41 and a plurality of heat transfer fins 42 communicating with them between the upper tank 43 and the lower tank 44, The accumulator 6 has an open upper end coupled to the lower tank 44 of the heater core 4 so that the refrigerant discharged from the evaporator 3 and introduced through the connection pipe 55 is introduced into the heater core 4. Automotive air conditioner, characterized in that the heat exchange with the cooling water flowing. The method of claim 2, Beads 441 are formed along the outer circumference of the lower tank 44 of the heater core 4, Opening edges of the accumulator 6 are bent to hold the beads 441 so that the accumulator 6 is coupled to the heater core 4 so that the accumulator 6 does not escape from the heater core 4, The O-ring 61 is interposed between the concave portion formed below the bead by the bead 441 and the inner surface of the open bent portion of the accumulator 6 to maintain the liquid tightness of the accumulator 6. Automotive air conditioner, characterized in that. The method of claim 1, The evaporator 3 has a pair of plates 72 and 72 formed in an L shape having at least two hole cups 721 and 722 at a lower end thereof to be bonded to each other to form a flat tube 71. 71 are formed in a plurality of stacks in a state in which the corresponding cups 721 and 722 are in communication with each other, and the heating fins 73 shared with the heater core 4 are interposed between the flat tubes 71 to be stacked. , Two hole cups 721 and 722 of one end plate 72 of the plates of the evaporator are a refrigerant inlet 35 and a refrigerant outlet 36, The heater core 4 is installed in the space formed by the evaporator and is integrally connected to each flat tube of the evaporator, so that a plurality of flat tubes 81 forming an overall rectangular flat shape together with the flat tubes of the evaporator are provided. The heat transfer fins 73 are made to be stacked in order while sharing, The flat tube 81 of the heater core 4 is formed by joining two plates (82, 82) having two hole cups (821, 822) at the lower end, The accumulator 6 is formed by sequentially joining the coolant flow channel hole cups 65 formed to be partitioned from the hole cups 821 and 822 at lower ends of the plates of the heater core. The refrigerant channel hole cup 65 at one end of the refrigerant channel hole cups 65 is connected to the refrigerant outlet 35 of the evaporator as the refrigerant inlet 62 and the hole channel 65 for the refrigerant channel at the other end. The air conditioner for automobiles, characterized in that connected to the compressor (51) as the refrigerant discharge port. The method according to any one of claims 1 to 4, The air conditioner for automobiles, characterized in that a mesh filter (64) is provided at a position between the refrigerant inlet (62) and the refrigerant outlet (63) of the internal flow path of the accumulator (6). A plurality of tubes 41 and the heat transfer fins 42 are alternately stacked, and upper and lower tanks 43 and 44 are sequentially installed at upper and lower ends of the tubes so as to communicate with the internal flow paths, and the upper tank 43 In the heat exchanger in which the coolant inlet 45 and the coolant outlet 46 are sequentially installed, The lower tank 44 further includes an accumulator 6 having a refrigerant inlet 62 connected to the refrigerant outlet of the evaporator and a refrigerant outlet 63 connected to the refrigerant suction side of the compressor. Heat exchanger made. The method of claim 6, The accumulator 6 has an open upper end coupled to the lower tank 44 to heat-exchange the refrigerant flowing in from the evaporator with the cooling water flowing through the upper and lower tanks and tubes. group. The method of claim 7, wherein A bead 441 is formed around the outer circumferential surface of the lower tank 44 and the open edge of the accumulator 6 is bent to grip the bead so that the accumulator is not separated from the lower tank. The O-ring 61 is coupled between the concave portion formed below the bead by the bead and the inner surface of the open bent portion of the accumulator, so that the liquid-tightness of the accumulator can be maintained. Heat exchanger. The method according to any one of claims 6 to 8, And a mesh filter (64) is provided at a predetermined position between the refrigerant inlet (62) and the refrigerant outlet (63) in the internal passage of the accumulator (6).

Images