KR100225506B1 - Evaporator of an air conditioner for use in an automobile - Google Patents

Abstract

The present invention discloses an improved evaporator for automotive air conditioners. In the present invention, the upper tank is divided into first and second cavities by the partition wall located in the longitudinal direction, the lower tank arranged at regular intervals so that the opening is opposed to the opening of the upper tank, and the upper And upper and lower cover plates each joined to seal the openings of the lower tank and having a plurality of rectangular fixed slots arranged in the width direction and formed in two rows along the longitudinal direction, and fixed slots of the two cover plates. The two ends are respectively inserted in the field so that one end communicates with the first and second cavities of the upper tank and the other end communicates with the lower tank in common, and the first and second cavities of the upper tank, A pair of first baffle plates alternately installed at predetermined intervals with respect to the second baffle plate and a second baffle plate installed at a lower tank and corresponding to a first baffle plate at an end thereof; A plurality of baffle plates, each having a refracted third baffle plate spaced at a predetermined interval so as to correspond to the other first baffle plate to guide the flow of the refrigerant into a predetermined shape, and interposed between the respective tubes Equipped with a plurality of corrugated heat transfer fins to promote heat exchange of the heat evaporator can be freely changed as needed while further improving the thermal efficiency.

Description

Evaporator for car air conditioner {EVAPORATOR OF AN AIR CONDITIONER FOR USE IN AN AUTOMOBILE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for automobiles, and more particularly to an evaporator for vaporizing a liquid refrigerant by heat exchange with air.

An air conditioner using a cooling cycle liquefies a refrigerant compressed at high temperature and high pressure in a compressor by heat exchange with air in a condenser, and then expands the liquid refrigerant into an expansion valve. It is an air conditioner that performs cooling by the heat of vaporization of a refrigerant absorbed by evaporation by evaporation by heat exchange with air in an evaporator through a low temperature, and is widely used throughout society.

For example, in automobiles, the air conditioner is used for cooling the car in the summer season. Since the air conditioner performs cooling by the heat of vaporization of the refrigerant, it is important to increase the heat transfer of the evaporator to improve the performance.

1 schematically shows an example of such a conventional evaporator 1. This is configured by arranging a plurality of tubes 3 each having a coolant flow in and out header portion 3a arranged at both ends, and joining adjacent header portions 3a to each other. Each tube (3) is formed by joining the upper and lower bodies (5, 6) punched aluminum plate in a predetermined shape to face each other, the two headers (7, 8) of each of the bodies (5, 6) are adjacent tube ( Slots 7a and 8a for communicating with the header portion 3a of 3) are formed, respectively. Accordingly, the header parts 3a of the respective tubes 3 constitute two headers 2 through which refrigerant flows from the condenser and flows out to the compressor side. Meanwhile, as shown in FIG. 2, baffle plates 9 which alternately induce refrigerant to flow in a plurality of tubes 3 in a zigzag form are alternately arranged at predetermined positions of the two headers 2. This baffle plate 9 is achieved by removing the slots 7a and 8a of each header portion 3a of two adjacent tubes 3. Meanwhile, a corrugate heat transfer fin 4 is provided between the tubes 3 to promote heat exchange of the refrigerant.

However, the conventional evaporator 1 may improve the evaporation efficiency by simultaneously passing the refrigerant through a plurality of tubes 3, but on the other hand, each tube 3 should be punched out by a press and bonded to each other. Therefore, the production is quite difficult and complicated. In particular, since the length of the tube 3 is determined by the mold, it is impossible to change the height of the evaporator 1, and thus, when the height of the evaporator 1 is changed, there is no choice but to manufacture a mold for punching separately. Therefore, the conventional evaporator 1 has a problem of lowering the productivity and raising the cost.

The object of the present invention is to provide an evaporator for an automotive air conditioner that can be simply manufactured while further improving the heat exchange efficiency of the refrigerant in view of the above-mentioned conventional problems, and can freely change its height without producing a separate mold as in the prior art. It is.

In order to achieve the above object, an evaporator for an automotive air conditioner according to the present invention includes an upper tank partitioned into first and second cavities by partition walls located in the longitudinal direction thereof, and an opening of the upper tank. Lower and lower tanks arranged at regular intervals to face the openings, and upper and lower covers each joined to seal them in the openings of the upper and lower tanks, and having a plurality of rectangular fixed slots arranged in the width direction and formed in two rows along the length direction. It consists of a plate and an extrusion process, both ends of which are inserted into the fixing slots of the two cover plates, respectively, so that one end communicates with the first and second cavities of the upper tank, and the other end communicates with the lower tank in common. A flat tube and a pair of first baffle plates alternately installed at predetermined intervals with respect to the first and second cavities of the upper tank, and the first baffle at the end of the lower tank. The second baffle plate is installed in correspondence with the lower baffle plate and the second baffle plate is spaced apart by a predetermined distance so that one end of the refracted third baffle plate is installed to correspond to the other first baffle plate to form a flow of refrigerant It characterized in that it comprises a plurality of baffle plates leading to the, and a plurality of corrugated heat transfer fins interposed between each tube to promote heat exchange of the refrigerant.

Accordingly, the present invention is simple in structure and easy to manufacture, but the heat exchange efficiency is further improved as compared to the prior art, and the height of the evaporator can be freely changed as necessary, so that the cooling performance and the manufacturability of the automotive air conditioner can be improved, and the cost reduction steel, etc. Great effect

1 is a partially enlarged front view showing an example of a conventional evaporator,

2 is a schematic diagram schematically showing the refrigerant flow;

3 is an exploded perspective view showing an embodiment of an evaporator according to the present invention;

4 is a partially enlarged front view showing the engaged state thereof;

5 is a cross-sectional view taken along the line VV of FIG.

6 is a schematic view schematically showing the refrigerant flow;

7 is an exploded perspective view showing another embodiment of the present invention;

8 is a partially enlarged front view showing the engaged state thereof;

9 is a cross-sectional view taken along the line VII-VII of FIG. 8,

10 is a schematic diagram schematically showing the refrigerant flow.

Explanation of symbols for main parts of the drawings

12, 14: upper and lower tanks

13a, 15a: engaging jaw (of upper and lower tanks)

16, 17: upper and lower cover plates

18 tube 18a bulkhead

18b: refrigerant flow path (of tube)

19: corrugated heat fin (corrugate fin)

20: baffle plate

Such specific features and other advantages of the present invention will become more apparent from the description of the preferred embodiments with reference to the accompanying drawings.

3 to 5, the evaporator 11 for the automotive air conditioner according to the present invention is arranged at regular intervals such that the upper and lower tanks 12 and 14 are opposed to each other so that the openings 12a and 14a face each other. The upper and lower cover plates 16 and 17 sealing them are joined to the openings 12a and 14a of the (12) and (14), respectively. To this end, flanges 13 and 15 having engaging jaws 13a and 15a are respectively outwardly at the leading ends of the upper and lower tanks 12 and 14 so that the respective cover plates 16 and 17 are seated. Is formed.

Two coupling slots 12b are formed in the upper tank 12 at predetermined intervals, and one coupling slot 14b is formed in the lower tank 14 so as to be positioned in the middle of the coupling slots 12b of the upper tank 12. Thus, the coupling slots 12b and 14b of the two tanks 12 and 14 are alternately arranged. In addition, a coolant inlet 12c and a coolant outlet 12d through which the coolant flows in and out are formed outside the two coupling slots 12b of the upper tank 12, respectively.

The upper and lower cover plates 16 and 17 have a plurality of rectangular fixing slots 16a and 17a each formed in two rows along its length direction, each fixing slot 16a and 17a being long in the width direction thereof. Is placed.

The fixed slots 16a and 17a of the upper and lower cover plates 16 and 17 are respectively inserted at both ends of the plurality of flat tubes 18 constituted by extrusion, so that the upper and lower tanks 12 ( 14) to be in communication with each other. Accordingly, the present invention evaporator 11 has a configuration in which the tubes 18 are arranged in two rows in the longitudinal direction of each of the tanks 12 and 14.

Between the tubes 18, a plurality of corrugated heat transfer fins 19 are interposed therebetween so that the refrigerant flowing along them smoothly exchanges heat with the outside air, and these heat transfer fins 19 are connected to each row of tubes 18. The heat transfer fins 19 may be interposed between the plurality of coils, but are preferably configured so that one heat fin 19 is in common contact with the tubes 18 in each row as shown. In addition, preferably, the partition walls 18a for partitioning the plurality of refrigerant flow paths 18b are formed together in the extrusion molding of the tube 18 in each of the tubes 18 to improve heat exchange efficiency by increasing the heat transfer area. .

In the coupling slots 12b and 14b of the upper and lower tanks 12 and 14, a plurality of baffle plates 20 for inducing refrigerant to sequentially pass through the plurality of tubes 18 in a substantially zigzag form, respectively. Inserted and joined.

Meanwhile, the present invention evaporator 11 is preferably composed of aluminum materials having excellent thermal conductivity, and simultaneously brazed by a clad material made of aluminum alloy, which is the same material. Are bonded. Such a clad material is made of aluminum and a small amount of silicon and manganese are added, and has a melting temperature of about 30 ° C. lower than that of aluminum. Accordingly, the cladding material is coated on the surface of each component to be pre-assembled, and then passed through a brazing furnace at a predetermined temperature, for example, about 620 ° C. Then, components of aluminum material having a melting temperature of about 650 ° C. are not melted, and only the clad material having a lower melting temperature is melted and fired so that the components are bonded to each other to form an evaporator.

As shown in FIG. 6, the evaporator 11 for automobile air conditioner according to the present invention having such a structural feature is a liquid refrigerant introduced into the upper tank 12 through a refrigerant inlet 12c from a condenser (not shown). Is heat exchanged with air while passing through the plurality of tubes 18 simultaneously and sequentially by the baffle plate 20 and then flows out to the compressor (not shown) through the refrigerant outlet 12d. At this time, the refrigerant is vaporized by absorbing the heat of the surrounding air through the surface of each tube 18 and the heat transfer fins 19, and the present invention is not only composed of two rows of tubes 18 but also each tube ( Since a plurality of refrigerant passages 18b of 18 are constituted by a plurality of partitions 18a, the heat transfer area is greatly increased as compared with the prior art, thereby further improving heat exchange efficiency.

In addition, the evaporator 11 of the present invention, since each tube 18 is configured by the extrusion process, the length can be freely changed as necessary, evaporator 11 without separately manufacturing a tube punching mold as in the prior art ) Height can be varied. Accordingly, the manufacturing of the evaporator 11 is not only simpler than in the related art, but also significantly reduces the manufacturing cost.

7 to 9 show another embodiment of the present invention evaporator 21.

7 to 9, the upper and lower tanks 22 and 26 are arranged at regular intervals so that the openings 22a and 26a face each other, and the openings 22a of each tank 22 and 26 ( The upper and lower cover plates 28 and 29 sealing them are respectively joined to 26a). To this end, flanges 23 and 27 having engaging jaws 23a and 27a are respectively formed outwardly at the leading ends of the upper and lower tanks 22 and 26 so that the respective cover plates 28 and 29 are seated. .

The inside of the upper tank 22 is partitioned into first and second cavities 25a and 25b through which refrigerant flows, respectively, by partitions 24 formed in the longitudinal direction thereof, and the first and second cavities at predetermined positions thereof. The two coupling slots 22b and 22b 'which communicate with each of the 25a and 25b are formed in the width direction at predetermined intervals and are alternately arranged. In addition, a coolant inlet 22c is formed at one side of the upper tank 22 so as to communicate with the first cavity 25a, and a coolant outlet 22d is formed at the other side so as to communicate with the second cavity 25b. In the lower tank 26, a rectangular first coupling slot 26b is formed in the width direction so as to face the coupling slot 22b 'at the end of the upper tank 22, and the first coupling slot 26b and the predetermined width are formed in the width direction thereof. In the spaced apart position, a second coupling slot 26c having a deflection type is formed so that one end thereof faces another coupling slot 22b of the upper tank 22.

The upper and lower cover plates 28 and 29 have a plurality of rectangular fixing slots 28a and 29a formed long in the width direction thereof, and are arranged in two rows along the length direction.

Both end portions of the plurality of flat tube tubes 30 formed by extrusion are inserted into the fixed slots 28a and 29a of the upper and lower cover plates 28 and 29, respectively, so that the upper and lower tanks 22 ( 26) to be in communication with each other. Accordingly, one end of the row of tubes 30 is in communication with the first cavity 25a of the upper tank 22, and one end of the other row of tubes 30 is connected to the second cavity 25b of the upper tank 22. In communication with each other, the other ends of the tubes 30 in each row communicate with the lower tank 26 in common. Preferably, the tube 30 is partitioned into a plurality of refrigerant passages 30a by partition walls 31 formed in the longitudinal direction during the extrusion to improve the heat transfer area.

A plurality of corrugated heat transfer fins 32 are interposed therebetween so that the refrigerant flowing along them may exchange heat with the outside air smoothly. These heating fins 32 may be interposed between the tubes 30 of each row, but preferably, one heating fin 32 is configured to make common contact with the tubes 30 of each row as shown. .

In addition, each of the coupling slots 22b, 22b ', 26b, 26c of the upper and lower tanks 22 and 26 includes a plurality of baffles for guiding the refrigerant to sequentially pass through the plurality of tubes 30 in a predetermined form. The plates 33 are respectively inserted and joined. The baffle plate 33 is a pair of first baffle plates 33a inserted into two coupling slots 22b and 22b 'of the upper tank 22, and a first coupling slot 26b of the lower tank 26, respectively. It consists of a second baffle plate (33b) is inserted into the third baffle plate (33c) of the refractive type inserted into the second coupling slot (26c) of the lower tank (26).

Meanwhile, the present invention evaporator 21 is also configured by brazing welding each component by the clad material as in the above-described embodiment.

As illustrated in FIG. 10, the evaporator 21 having such a structural feature includes a liquid refrigerant introduced into the first cavity 25a of the upper tank 22 through the refrigerant inlet 22c from the condenser and the baffle plate 33. By passing through the plurality of tubes (30) of each row at the same time and sequentially through the heat exchange with the air and then to the compressor side through the refrigerant outlet 22d of the second cavity (25b). At this time, the refrigerant is vaporized by absorbing the heat of the surrounding air through the surface of each tube 30 and the heat transfer fins 32, the present invention is the tube 30 is composed of two rows of refrigerant is a tube of each row Not only the 30 flows sequentially, but also the refrigerant flow path 30a of each tube 30 is constituted by a plurality of partition walls 31, so that the heat exchange efficiency is further improved than the above-described embodiment.

That is, the refrigerant introduced into the first cavity 25a of the upper tank 22 flows into the lower tank 26 through the plurality of tubes 30 in a row by the first baffle plate 33a in front thereof. The third baffle plate 33c is introduced into the second cavity 25b of the upper tank 22 through the plurality of tubes 30 doubled in different rows. The first tank 25a of the upper tank 22 is then introduced into the lower tank 26 through the plurality of reduced tubes 30 adjacent to each other, and then through the plurality of tubes 30 doubled in another row. Flows into. It is then introduced into the lower tank 26 through the plurality of reduced tubes 30 adjacent to the row, and then into the second cavity 25b of the upper tank 22 through the plurality of tubes 30 in another row. Will be discharged. Therefore, compared to the above-described embodiment, the flow rate of the refrigerant is greatly increased, so that the improvement of the heat exchange efficiency can be expected.

In addition, the evaporator 21 of the present embodiment is also the tube 30 is configured by extrusion processing, so that the length can be freely changed as necessary, evaporator 21 without separately manufacturing a tube punching mold as in the prior art It is possible to vary the height of the. Accordingly, the manufacture of the evaporator 21 is not only very simple compared to the conventional, but also significantly reduces the manufacturing cost.

As described above, according to the present invention, since the tube is configured by extrusion processing, it is not only possible to freely change the height of the evaporator if necessary, but also very simple compared to the conventional method of forming each tube by punching an aluminum sheet with a press. I can make it. In addition, the heat transfer area of the tube is greatly increased to maximize the heat exchange efficiency of the refrigerant.

Therefore, the present invention not only greatly improves the cooling performance and productivity of the air conditioner for automobiles, but also has a very excellent effect of significantly reducing the manufacturing cost.

Claims (2)

An evaporator for an automotive air conditioner that vaporizes a refrigerant liquefied in a condenser by heat exchange with air and supplies it to a compressor. An upper tank 22 whose interior is partitioned into first and second cavities 25a and 25b by partition walls 24 located in the longitudinal direction thereof; A lower tank 26 disposed at a predetermined interval so that the opening 26a faces the opening 22a of the upper tank 22; The upper and lower tanks 22 and 26 are respectively joined to seal the openings 22a and 26a, and a plurality of rectangular fixing slots 28a and 29a are arranged in the width direction and arranged in two rows along the longitudinal direction. Upper and lower cover plates 28 and 29 formed, It is composed of an extrusion process and both ends are inserted into the fixing slots 28a, 29a of the two cover plates 28, 29, respectively, and one end of the first and second cavities 25a of the upper tank 22. A plurality of flat tube tubes 30 in two rows in communication with each other and in communication with the lower tank 26; A pair of first baffle plates 33a alternately installed at predetermined intervals with respect to the first and second cavities 25a and 25b of the upper tank 22, and the first end of the terminal to the lower tank 26. The second baffle plate 33b installed to correspond to the baffle plate 33a and the lower tank 26 are spaced apart from the second baffle plate 33b by a predetermined distance, and one end thereof is the other first baffle plate 33a. A plurality of baffle plates 33 formed of a refracted third baffle plate 33c which guides the flow of the refrigerant to a predetermined shape; An evaporator for an automotive air conditioner, comprising a plurality of corrugated heat transfer fins 32 interposed between the tubes 30 to promote heat exchange of the refrigerant. The method of claim 1, Evaporator for an automotive air conditioner, characterized in that the tube (30) has a plurality of refrigerant passages (30a) partitioned by partition walls (31) formed in the longitudinal direction.

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