JPH04125167U - Stacked evaporator - Google Patents

Abstract

(57) [Summary] [Purpose] To improve durability by preventing stress from being applied to each component based on freezing of condensed water. [Configuration] The width dimension of the end portion 14a of the side plate 14 is
It is made smaller than the width dimension of element 2. As a result, element 2
A micro space in which condensed water can accumulate is prevented from being formed between the groove 31 existing at both left and right ends of the outer surface of the side plate 14 and the end 14a of the side plate 14.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The stacked evaporator according to this invention can be incorporated into an automobile air conditioner, Cools the air for air conditioning inside the vehicle.

0002

[Conventional technology]

Automotive air conditioners evaporate refrigerant internally to cool the air circulating outside. It has a built-in evaporator to dissipate it.

0003 This type of evaporator has traditionally been incorporated into automotive air conditioners. , for example, as described in Japanese Patent Application Laid-Open No. 62-798, multiple metal plates are mutually A so-called laminated type evaporator, which is formed by laminating two layers, is known.

0004 As shown in FIG. 8, this stacked evaporator consists of two metal plates 1 and 1, respectively. It is constructed by laminating a plurality of elements 2, 2, which are formed by combining ing. For each metal plate 1, 1, as shown in Figures 8 to 10, a A flat part 3, a shallow first recess 4 formed in a U-shape inside this flat part 3, and this Deep second and third recesses 5 and 6 formed at both ends of the first recess 4, and second and third recesses 5. , 6 are provided with through holes 7 and 8 formed in the center thereof. Also, inside the first recess 4 is provided with a plurality of convex portions 9, 9 to disturb the flow of refrigerant inside this first recessed portion 4. I'm doing it like that.

[0005] The plurality of elements 2, 2 constituting the stacked evaporator each have the above-mentioned shape. Two metal plates 1 having a The U-shaped part surrounded by the first recess 4 is The flat tube part 12 through which the medium flows, and the part surrounded by the second and third recesses 5 and 6 is the inlet. It is designed to function as a side tank or part of the outlet side tank.

[0006] As shown in FIG. The outer surfaces of the second and third recesses 5 and 6 of the metal plates 1 and 1 are butted against each other to stack them, and the second , the inlet pipe 10 is placed in one of the pair of spaces formed by the third recesses 5 and 6. , and an outlet pipe 11 is connected to the other space.

[0007] With a plurality of elements 2, 2 stacked in this way, the flat tube portions of adjacent elements 2, 2 Between 12 and 12, corrugated fins 13 and 13 are sandwiched to form a core part, Air flowing between adjacent flat tube sections 12, 12 and the inside of each flat tube section 12, 12 This ensures good heat exchange between the refrigerant and the flowing refrigerant.

[0008] Also, the outside of the fins 13, 13 attached to the outside surfaces of the elements 2, 2 located at both left and right ends. Side plates 14, 14 are provided on the sides, and each of the fins 13, 13 is is pressed against the outer surface of each of the elements 2, 2.

[0009] Since the stacked evaporator is constructed and constructed as described above, there is no input from the inlet pipe 10. When a gas-liquid mixed-phase refrigerant is sent into one space that functions as the mouth side tank, this While the refrigerant flows through the flat tube portions 12, 12 of the plurality of elements 2, 2, the refrigerant passes through the flat tube portions 12, Heat exchange is performed with the air flowing between the fins 13 and 13 provided outside the fins 12. After evaporating due to the It is discharged through pipe 11.

0010 In addition, Japanese Patent Application Laid-Open No. 61-27496 discloses a system for each tank as shown in Figures 11 to 13. A multi-layered evaporator is disclosed. In the case of this stacked evaporator, One side of a metal plate 16 with a pair of protrusions 15, 15 formed on one end edge at a distance from each other. a U-shaped recess 17 in It is formed in a continuous state up to the edge. There are many protrusions 18 inside the recess 17. , 18, and the cold flowing inside the folded passage 19 formed by the recess 17. The flow of the refrigerant is disturbed so that heat exchange between the refrigerant and the metal plate 16 can be performed efficiently. I have to.

[0011] Then, a laminated type evaporator with a separate tank is manufactured using such a metal plate 16. In the case of the By overlapping each other in the middle and joining them liquid-tightly, a U-shaped fold is created. A return channel 19 and a pair of joints located at both ends of this channel 19 and protruding from the edge. The elements 25, 25 have portions 26, 26.

0012 Then, the respective joint portions 26, 26 of the plurality of elements 25, 25 are connected to a pair of tangents. Insert into the slit-shaped connection holes 21, 21 formed on the sides of the blocks 20, 20, respectively. At the same time, the outer circumferential surface of each joint 26, 26 and the inner circumferential edge of each connection hole 21, 21 are mutually aligned. This is a liquid-tight brazing joint. Each tank 20, 20 is as shown in FIG. It is constructed by combining the seat plate 22 and the tank body 23 and brazing them together liquid-tightly. The connection holes 21, 21 are formed on the bottom surface of the seat plate 22. child At the same time, fins 13, 13 (see FIG. 8) are provided between adjacent elements 25, 25. constitute the core part.

[0013] Among the pair of tanks 20, 20, the inside of one tank 20 is fixed to the middle part. The partition wall 24 divides the entrance chamber 27 and the exit chamber 28 into an entrance chamber 27 and an exit chamber 28. A fluid inlet 29 is provided on the side of 7, a fluid outlet 30 is provided on the side of the outlet chamber 28, and Each is provided.

[0014] In the case of a stacked evaporator with a separate tank configured as described above, the fluid feed When the refrigerant is sent through the port 29, the refrigerant passes through the plurality of folded passages 19. Then, it flows out from the fluid outlet 30.

[0015] In the case of such a stacked evaporator with a separate tank, the elements located at both left and right ends are Side plates are attached to the outside of the fins attached to the outer surfaces of the children 25 and 25, respectively. and press the fins 13, 13 onto the outer surfaces of the elements 25, 25. .

[0016]

[Problem that the idea aims to solve]

However, in the case of a stacked evaporator that is configured and operates as described above, FIGS. Even if it is an integrated tank type as shown in Figure 10, or a tank type as shown in Figures 11 to 13. Even with a separate link type, the following problems arise.

[0017] That is, the fins 13, 13 located at both ends are replaced by the elements 2, 2 (FIG. 8) located at both ends. ) or a side plate 14 for pressing against the outer surface of the elements 25, 25 (Fig. 12) , 14 (FIG. 8) is bent into a crank shape as shown in FIG. a to the outer edge of the metal plates 1 and 16 that constitute each element 2 and 25, as shown in FIG. bring it into contact.

[0018] On the other hand, on both left and right ends of the outer surface of each of the metal plates 1 and 16, A concave groove 31 is formed to improve rigidity, and the end portion 14a is formed in a concave groove 31. It is placed over the end of each metal plate 1, 16, covering a part of the metal plate 31. For this reason, each gold The grooves 31 and the ends of the side plates 14 are located at both left and right ends of the outer surfaces of the metal plates 1 and 16. A microscopic space surrounded by the portion 14a existed.

[0019] During operation of an automobile air conditioner, the surface of the stacked evaporator is exposed to air. The condensed water produced when the water vapor contained in the hair condenses adheres to the hair. Due to the capillary phenomenon, it tends to accumulate in the microscopic space.

[0020] On the other hand, the air conditioning system for automobiles continues to operate, and the laminated evaporative If the amount of air sent to the motor is small (wind speed is slow), use a laminated evaporator. Condensed water on the surface of the data may freeze.

[0021] If the condensed water that has accumulated in the microscopic space freezes, the body will be affected by the freezing. Due to the increase in volume, a large force is applied to the metal plates 1 and 16 and the side plate 14 surrounding the small space. is added. The automobile air conditioner is repeatedly started and stopped, and the above-mentioned major problems occur. If a force is applied repeatedly, the metal plates 1, 16 and the side plate 14 may It will gradually become fatigued and may eventually break.

[0022] In Japanese Utility Model Application No. 61-119077, a water distribution passage is formed at the end of the side plate. However, condensed water that accumulates in the microspace due to capillary action is cannot be discharged.

[0023] The stacked evaporator of the present invention solves the above-mentioned disadvantages.

[0024]

[Means to solve the problem]

The stacked evaporator of the present invention is similar to the stacked evaporator described above. Two metal plates each with a recess formed on one side and grooves formed on both left and right ends of the other side. Make one pair and stack them in the middle with their recesses facing each other to make them liquid-tight. By bonding to the It has a core made up of overlapping elements with fins between them. , fins shorter than the element attached to the outer surface of the element located at both ends of this core part A side plate is provided on the outside of each, and the end of this side plate is used for clamping. It is constructed by bringing the bent part into contact with the outer surface of the above element. .

[0025] Furthermore, in the stacked evaporator of the present invention, at the end of the side plate, Make the width of the part that contacts the outer surface of the element a little shorter than the width of the multiple elements mentioned above. The feature is that the end of the side plate does not cover the groove. ing.

[0026]

[Effect]

By using the stacked evaporator of the present invention configured as described above, the interior of the evaporator is When heat is exchanged between the refrigerant flowing through the evaporator and the air flowing outside the evaporator, The operation itself is similar to that of the conventional stacked evaporator described above.

[0027] However, in the case of the stacked evaporator of this invention, the width of the end of the side plate is small. This edge does not cover the groove on the outer surface of the element, so this groove and the side plate A microspace surrounded by the end portions is not formed.

[0028] For this reason, condensed water does not accumulate in minute spaces, and the layering based on the freezing of condensed water Damage to the mold evaporator is prevented.

[0029]

【Example】

The structure of the stacked evaporator of the present invention is such that the width of the end portion 14a of the side plate 14 is Other than reducing the size of Since it is the same as the stacked evaporator described in Publication No. 7496, the explanation is redundant. The features of the present invention will be explained below.

[0030] Elements 2 and 25 (see Figures 8 and 12) and fins 13 and 13 (see Figure 8) are alternately connected. Sides that hold down the fins 13, 13 located at both ends of the laminated core part from the outside. The plate 14 is formed by bending a thin aluminum plate, as shown in Figures 5 to 7. It is composed of

[0031] One end of this side plate 14 (upper part in FIGS. 5 and 6) is bent into a crank shape. The main portion 14b and the end portion 14a are made in proportion to the thickness of the fin 13. It is made continuous by a stepped portion 14c having a height dimension.

[0032] The width W of the main portion 14b is the width of the elements 2, 25 and the fins 13. The width dimension w of the end portion 14a is almost the same as the width dimension (depth) of the elements 2, 25. It is smaller than this by the amount of grooves 31 located at both left and right ends of the outer surface of (W>w) are doing.

[0033] As mentioned above, the width of the end portion 14a is smaller than the width of the elements 2 and 25. The side plate 14, as shown in FIGS. 1 and 2, is similar to the conventional side plate described above. With the end 14a in contact with the outer surface of the end of the elements 2 and 25, this end 14 One side of the element 2 and the outer surface of the elements 2 and 25 are brazed, and the element 2 located at the end of the core part is , 25, and press the fins 13 against them.

[0034] In this state, in the stacked evaporator of the present invention, the side plate 14 is Since the width w of the end 14a is smaller than the width (≒W) of the elements 2 and 25, this end The portion 14a does not cover the grooves 31 provided at both left and right ends of the outer surfaces of the elements 2 and 25. It becomes. Therefore, the groove 31 and the end portion 14a of the side plate 14 surround the circumference. A microscopic space is not formed.

[0035] For this reason, condensed water does not accumulate in minute spaces, and the layering based on the freezing of condensed water Damage to the mold evaporator is prevented.

[0036] In addition, in FIGS. 1 to 4, 32 and 32 are the respective elements 2 and 25 (FIGS. 8 and 11 to 1). In order to prevent the fins 13, 13 (Fig. 8) sandwiched between the This is a bent edge formed at the edge of the metal plates 1 and 16 that constitute the children 2 and 25. child The folded edges 32, 32 are conventionally known and are the gist of the present invention. Since there is no such thing, it is omitted in other than FIGS. 1 to 4.

[0037]

[Effect of the idea]

The stacked evaporator of the present invention is constructed and operates as described above, but This prevents excessive stress from being applied to each component due to freezing of condensed water accumulated in the space. This improves durability.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view corresponding to section A in FIG. 8, showing an embodiment of the present invention.

FIG. 2 is a view taken along arrow B in FIG. 1, showing the same assembled state.

FIG. 3 is a diagram similar to FIG. 1, showing a conventional example.

FIG. 4 is a view taken along arrow C in FIG. 3, showing the same assembled state.

FIG. 5 is a side view of a side plate showing an embodiment of the present invention.

FIG. 6 is a diagram seen from the right side of FIG. 5.

FIG. 7 is a view seen from above in FIG. 5;

FIG. 8 is a front view showing a first example of a conventional stacked evaporator.

FIG. 9 is a side view of a metal plate constituting this evaporator.

FIG. 10 is a sectional view taken along line DD in FIG. 9;

FIG. 11 is a partially exploded perspective view showing a second example of a conventional evaporator.

FIG. 12 is a bottom view showing the same assembled state.

FIG. 13 is a side view as well.

[Explanation of code] 1 Metal plate 2 elements 3 Flat area 4 First recess 5 Second recess 6 Third recess 7 Through hole 8 Through hole 9 Convex part 10 Inlet pipe 11 Outlet pipe 12 Flat tube part 13 Fin 14 Side plate 14a end 14b Main part 14c Stepped section 15 Projection 16 Metal plate 17 Recess 18 Protrusion 19 Folded channel 20 tank 21 Connection hole 22 Seat board 23 Tank body 24 Bulkhead 25 elements 26 Joint part 27 Entrance room 28 Exit room 29 Fluid inlet 30 Fluid outlet 31 Groove 32 Folded edge

Claims (1)

[Scope of utility model registration request] [Claim 1] A set of two metal plates each having a concave portion formed on one side and a concave groove formed on both left and right ends of the other side,
By overlapping each other with their recesses facing each other and liquid-tightly joining each other, it is possible to create an element with a flat flow path inside, and to connect multiple elements with fins between adjacent elements. It has a core section that is constructed by overlapping each other in the provided state, and a side plate is provided on the outside of each fin that is shorter than the element and is attached to the outer surface of the element located at both ends of this core section. In a stacked evaporator in which the crank-shaped bent portion at the end of the plate is in contact with the outer surface of the element, the width of the portion of the side plate that is in contact with the outer surface of the element is as follows. A multilayer evaporator characterized in that the width of the side plate is made slightly shorter than the width of the plurality of elements so that the end portion of the side plate does not cover the groove.