JPH04117363U - Evaporator - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent uneven flow of refrigerant, equalize the temperature distribution of air passing through the evaporator, and improve performance. [Structure] A joint 19a formed at the end of an element 20 having a folded channel 18 is inserted into a tank 21.
An arcuate notch 35 is provided at the edge of the joint 19a to keep the amount of protrusion into the tank 21 small.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The evaporator according to this invention is incorporated into an automotive air conditioner to cool the air. Therefore, the present invention improves the evaporator by equalizing the flow of refrigerant in the evaporator. This aims to improve the performance of this evaporator by equalizing the temperature distribution of the air passing through the evaporator. be.

0002

[Conventional technology]

Air conditioners have evaporators that evaporate refrigerant inside and cool the air flowing outside. Built-in generator.

0003 As an evaporator built into such an air conditioner, for example, the It is made by laminating multiple metal plates together, as described in Publication No. 62-798. A so-called stacked evaporator is known.

0004 As shown in Fig. 4, this stacked evaporator has two metal plates 1 and 1 in the middle. It is composed of a plurality of units 2, 2 which are combined in a shape and are stacked on top of each other. There is. Each metal plate 1, 1 is provided with 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 units 2, 2 constituting the stacked evaporator each have the above-mentioned shape. Two metal plates 1 with the metal plates are butted against each other, and assembled in a middle shape. The U-shaped part surrounded by the first recess 4 is filled with refrigerant. The flat pipe part 12 for flowing water is defined as the part surrounded by the second and third recesses 5 and 6 as the inlet side tap. It is designed to function as a tank or part of the outlet tank.

[0006] The above-mentioned units 2, 2 are configured by a plurality of each unit 2, 2 as shown in FIG. The metal plates 1 and 1 are laminated by butting the outer surfaces of the second and third recesses 5 and 6 together. and an entrance to one of the pair of spaces constituted by the second and third recesses 5 and 6. A pipe 10 is connected to the other space, and an outlet pipe 11 is connected to the other space.

[0007] With multiple units 2, 2 stacked in this way, adjacent units 2, 2 Corrugated fins 13, 13 are sandwiched between the flat tube parts 12, 12, and the adjacent Air flows between the flat tube parts 12, 12 that match, and air flows inside each flat tube part 12, 12. This ensures good heat exchange between the refrigerant and the refrigerant.

[0008] Since the stacked evaporator is configured and manufactured as described above, from the inlet pipe 10, the inlet side When a gas-liquid two-phase refrigerant is sent into one space that functions as a tank, this refrigerant While flowing through the flat tube portions 12, 12 of the plurality of units 2, 2, the flat tube portion 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.

[0009] By the way, in order to facilitate the manufacture of a stacked evaporator constructed and operated as described above, The idea of separating the tank and the unit made of two overlapping metal plates was discovered in JP-A-Sho. It is disclosed in Japanese Patent No. 61-27496.

0010 That is, in the case of the conventional structure shown in Figs. 4 to 6, a tank is installed at the end of each unit 2, 2. Because it is integrally formed, there is a deep second groove at the end of the metal plates 1, 1 that make up each unit 2, 2. , the third recesses 5 and 6 are formed, but in order to form these second and third recesses 5 and 6. The pressing operation of 2 must be performed at the same time as forming the shallow first recess 4. A large amount of force is required during the pressing process, and the equipment required to press-form the metal plate 1 is large. It is unavoidable that the equipment costs will increase due to the standardization.

[0011] In order to solve such problems, in the case of a stacked evaporator with a separate tank, the steps shown in Figures 7 to 9 are shown. As shown, a pair of protrusions 14a and 14b are formed at one end with a space between them. A U-shaped recess 16 is formed on one side of the metal plate 15, and both ends of the recess 16 are formed with the pair of protrusions described above. It is formed so as to be continuous up to the edges of the portions 14a and 14b. Inside the recess 16 A large number of protrusions 17, 17 are formed on the side, and a folded channel formed by a recess 16 is formed. This disturbs the flow of the refrigerant flowing inside the refrigerant 18 and prevents heat exchange between the refrigerant and the metal plate 15. We make sure that it is done efficiently.

0012 A metal plate 15 having such a recess 16 and protrusions 17, 17 is disclosed in Japanese Patent Application Laid-Open No. 2-169. As shown in Publication No. 127, a long metal plate is passed between a pair of rolls. After forming the recesses 16 and protrusions 17, 17, the long metal plate is Since it can be manufactured by cutting the parts, the manufacturing equipment can be relatively simple.

[0013] In the case of a stacked evaporator with a separate tank, which is made using such a metal plate 15, In this case, the metal plates 15, 15 are made into a set of two, and the recessed portions 16, 16 are placed opposite each other. By overlapping each other in the middle and joining them liquid-tightly, a U-shaped fold is created. A return channel 18 and a pair of joints located at both ends of this channel 18 and protruding from the edge. It is assumed that elements 20 and 20 have portions 19a and 19b.

[0014] Then, the respective joint portions 19a and 19b of the plurality of elements 20 and 20 are connected to the first Slit-shaped connection holes 23 formed on the sides of the second tanks 21 and 22, respectively; 23, and the outer peripheral surface of each joint portion 19a, 19b and each connection hole 23, 23. and the inner circumferential edges thereof are liquid-tightly brazed to each other. Each tank 21, 22 is A bottom plate 33 and a top plate 34 as shown in Fig. 7 are combined in a middle shape and soldered together liquid-tightly. The connection holes 23, 23 are formed on the bottom surface of the bottom plate 33. has been done. Along with this, a fin (not shown) is provided between the adjacent elements 20, 20. establish.

[0015] The inside of the first tank 21 can be partitioned by a partition wall 24 fixed at the middle part. It is divided into an inlet chamber 25 and an outlet chamber 26, and a refrigerant inlet 27 is provided on the side of the inlet chamber 25. , a refrigerant outlet 28 is provided on the side of the outlet chamber 26, respectively.

[0016] In the case of a stacked evaporator with separate tanks configured as described above, the first and second tanks A space consisting of channels 21 and 22 and a folded passage 18 provided in a plurality of elements 20 and 20. The inside of the chamber can be divided into four chambers, the first, second, third, and fourth, as shown in Figure 10. come.

[0017] That is, the inlet chamber 25 existing in one half of the first tank 21 (the left half in FIG. 8) and the a first chamber 29 consisting of an upstream half of the elements 20 and 20 (left half in the figure); is provided on the downstream side of the first chamber 29 of the a second chamber 30 consisting of one half of the second tank 22 (left half in the figure); 30 (on the right side in the figure), and the other half of the second tank 22 (on the right side in the figure). a third chamber consisting of a half part) and a half part on the upstream side of the elements 20 and 20 in the remaining part (right half in the figure); 31, and the other half of the first tank 21 (in the same figure) is provided downstream of this third chamber 31. (the right half of) and the downstream half of the remaining elements 20, 20. .

[0018] In such a stacked evaporator divided into the first to fourth chambers 29 to 32, the arrows in Figure 10 As shown in a, when refrigerant is sent from the refrigerant inlet 27, this refrigerant is As shown by arrow b, it flows in the first chamber 29, and some of the elements 20, 20 turn around in the flow path 1. 8, it flows as shown by arrow c in the figure and enters the second chamber 30.

[0019] It flows in the second chamber 30 as shown by the arrow d, and flows to the downstream end of the second chamber 30. The refrigerant then flows inside the second tank 22 in the axial direction of this tank 22. After flowing in the direction of arrow e of 10 and entering the third chamber 31, this third chamber 31 is formed. The flow inside the folded channel 18 of the remaining elements 20, 20 is as shown by the arrow f in the same figure. It will be done.

[0020] Furthermore, the refrigerant flows through the folded passages of the remaining elements 20, 20, as shown by arrow g in the figure. 18, enters the fourth chamber 32, and follows the arrow h inside this fourth chamber 32. It flows as shown in .

[0021] The other half of the first tank 21 located at the downstream end of the fourth chamber 32 The refrigerant that has flowed to the right half of Fig. 8 is then sent from the refrigerant outlet 28 to the It flows out as shown by mark i.

[0022]

[Problem that the idea aims to solve]

However, the method disclosed in Japanese Patent Application Laid-open No. 2-169127, which is configured and operates as described above, Even in the case of the stacked evaporator shown, there are still problems to be solved as described below. exists.

[0023] That is, a vaporizer having a plurality of channels (corresponding to the folded channels 18) parallel to each other. In order for the generator to exhibit sufficient performance, the amount of refrigerant flowing through each channel must be uniform. It is necessary for a large amount of refrigerant to flow through some of the multiple flow paths parallel to each other, and the remaining If the amount of refrigerant flowing through the flow path decreases, the amount of heat exchanged by the evaporator as a whole will decrease. If this is not possible, the performance of the evaporator will deteriorate.

[0024] On the other hand, in the case of a stacked evaporator constructed and operated as described above, each stream is not necessarily It is not possible to equalize the amount of refrigerant flowing through the passage.

[0025] For example, the refrigerant inlet 27 is located in the center of one half of the first tank 21. Although the refrigerant feed port 27 is provided in the above-mentioned half, A large amount of the medium flows into the channel opened in the center of one half, which is close to the refrigerant inlet 27. , the amount of inflow into the flow path that is far from the refrigerant inlet 27 and opened toward both ends of one half is small. It's gone.

[0026] Furthermore, the refrigerant that has reached the downstream end of the second chamber 30 flows as shown by arrow e in FIG. When reaching the upstream end of the third chamber 31, the pressure of the refrigerant flowing in the direction of arrow e is higher downstream. Therefore, the cooling that is sent into the plurality of folded channels 18, 18 that constitute the third chamber 31 is As shown in Figure 11, the amount of medium is However, the number of channels increases by about 18.

[0027] In particular, in the case of a stacked evaporator configured as described above, each element is The tip of the joint 19a (19b) formed in the first (second) tank 21 (22), and this protruding part functions as a weir to prevent the flow of refrigerant. This creates a large resistance to the flow of refrigerant in the stacked evaporator. Not only is it not possible to increase the amount of refrigerant flowing inside the vessel, but the flow of refrigerant tends to be uneven. .

[0028] In order to eliminate the imbalance of refrigerant, it is necessary to The installation position and flow path area of the inlet port 27, and the refrigerant outlet port 28 leading to the outlet chamber 26. The mounting position and flow path area may be modified, or the partition wall 24 may be fixed within the first tank 21. Although it is possible to deal with this to some extent by devising the position of For relatively large evaporators with a large number of evaporators, these measures are sufficient to reduce flow bias. cannot be reduced.

[0029] The evaporator of the present invention eliminates the above-mentioned disadvantages.

[0030]

[Means to solve the problem]

In the evaporator of this invention, the ends of the flow sections, each with a flat cross section, are shaped into the side of the tank. Insert it into the slit-shaped connection hole that has been formed, and align the inner peripheral edge of each connection hole with the outer peripheral surface of each flow section. In an evaporator with a brazed space between the two, at the edge of the above-mentioned flow section, inside the above-mentioned tank. The inserted part is characterized by an arc-shaped cutout.

[0031]

[Effect] By using the evaporator of the present invention configured as described above, the refrigerant flowing inside the evaporator and the evaporator are separated. The action itself when exchanging heat with the air flowing outside the generator is similar to the conventional method described above. The same is true for the evaporator.

[0032] However, in the case of the evaporator of the present invention, the edge of the flow section is cut out in an arc shape, so The increase in flow resistance due to the edges of the above-mentioned flow section is minimized, and the flow inside the evaporator is reduced to a minimum. In addition to increasing the amount of refrigerant in the evaporator, it also reduces the tendency for the refrigerant flow to become biased. Performance can be improved.

[0033]

【Example】

1 to 3 show an example in which the present invention is applied to a stacked evaporator, whose structure is as follows: The edges of the joint portions 19a (19b) of each of the plurality of elements 20 are cut out in an arc shape. Other than that, it is the same as the stacked evaporator disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-169127. Therefore, repeated explanations will be omitted and the characteristic parts of the present invention will be explained below.

[0034] Provided in a plurality of elements 20 constituting the core part of the stacked evaporator, and serving as a flow part. The joint portions 19a (19b) located at both ends of the folded channel 18 of each element 20 are Inserted into the first (second) tank 21 (22) through the lit-shaped connection hole 23. It is. An arc-shaped notch is provided at the edge of the joint portion 19a (19b). 35 is provided to connect the joint 19a (to the first (second) tank 21 (22)). The amount of protrusion of 19b) is reduced.

[0035] In this way, the edge of the joint 19a (19b) existing at the end of the folded channel 18 By providing an arc-shaped notch 35 in the part, the end of the joint part 19a (19b) Increase in fluid flow resistance due to edges is minimized. As a result, inside the stacked evaporator In addition to increasing the amount of refrigerant that flows, it also reduces the tendency for the refrigerant flow to become uneven. The performance of this stacked evaporator is improved by uniformizing the temperature distribution of the air that passes through the stacked evaporator. can be achieved.

[0036] In addition, the size of the notch 35 formed in each joint part 19a (19b) is all the same. Although it is possible to improve the performance of the stacked evaporator to some extent, the size of the notch 35 may vary depending on the location. By varying the size, performance can be further improved.

[0037] For example, when inserted into the connection hole 23 formed on one side of the first tank 21 The edge of the joint portion 19a is provided at the center of one half of the first tank 21 shown in FIG. The smaller the distance x from the refrigerant inlet 27, the larger the notch becomes. If the cutout is made smaller as the distance x from the opening 27 increases, the above-mentioned cold The medium is fed into one half of the first tank 21 from the medium feeding port 27, and is shown by the arrow in FIG. The refrigerant flowing in the direction indicated by the mark forms multiple folded streams with one end open in this half. It flows evenly into the channels 18, 18.

[0038] Also, the downstream half of the second tank 22 (Figs. 8 to 9) (above the third chamber 31 (Fig. 10) The edge of the joint 19b inserted into the connection hole formed in the flow end (flow end) is If the notch is sharply cut out, the second tank 2 will open as shown by arrow e in FIGS. The refrigerant flowing through the second tank 22 from the upstream side to the downstream side flows into the downstream half of the second tank 22. It flows evenly into the plurality of folded channels 18, 18 whose ends are open.

[0039]

[Effect of the idea]

The evaporator of the present invention is constructed and operates as described above. It is possible to make the amount of refrigerant flowing in multiple channels parallel to each other almost equal. It is possible to improve the performance of the evaporator by making the temperature distribution of the air that has passed through the generator uniform. I can do it.

[Brief explanation of drawings]

[Fig. 1] Enlarged A-A of Fig. 8 with a notch formed in the connection part
A diagram corresponding to a cross section.

FIG. 2 is a view corresponding to arrow B in FIG. 10;

FIG. 3 is a view corresponding to arrow C in FIG. 10;

FIG. 4 is a front view showing a first example of a conventional stacked evaporator.

FIG. 5 is a side view of a metal plate constituting this evaporator.

FIG. 6 is a sectional view taken along line DD in FIG. 5;

FIG. 7 is a partially exploded perspective view showing a second example of a conventional stacked evaporator.

FIG. 8 is a plan view showing the same assembled state.

FIG. 9 is a side view as well.

FIG. 10 is a schematic perspective view showing the flow of refrigerant.

[Fig. 11] E in Fig. 10 showing a state in which the refrigerant flows unevenly.
-A diagram corresponding to the E cross section.

FIG. 12 is a sectional view taken along line AA in FIG. 8;

[Explanation of sign]

1 metal plate 2 units 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 14a Projection part 14b Projection 15 Metal plate 16 Recess 17 Protrusion 18 Folded channel 19a Joint part 19b Joint 20 elements 21 First tank 22 Second tank 23 Connection hole 24 Bulkhead 25 Entrance room 26 Exit room 27 Refrigerant inlet 28 Refrigerant outlet 29 First room 30 Second room 31 Third room 32 Fourth room 33 Bottom plate 34 Top plate 35 Notch

Claims (4)

[Scope of utility model registration request] [Claim 1] The ends of the flow portions each having a flat cross section,
Insert into the slit-shaped connection hole formed on the side of the tank,
In an evaporator in which the inner circumferential edge of each connection hole and the outer circumferential surface of each circulation part are brazed, the part inserted inside the tank is cut into an arc shape at the edge of the circulation part. An evaporator characterized by the lack of. 2. A U-shaped recess is formed on one side of a metal plate having a pair of protrusions spaced apart from each other on one edge, and both ends of the recess are continuous to the edges of the pair of protrusions. At the same time, these metal plates are made into a set of two, overlapped in the middle with their concave portions facing each other, and bonded liquid-tightly to each other to form a U-shaped folded flow path. and,
The element has a pair of joint parts located at both ends of the flow path and protruding from the edge, and each joint part of the plurality of elements is formed in a slit formed on the side surface of the first and second tanks. The outer circumferential surface of each joint part and the inner circumferential edge of each connection hole are liquid-tightly bonded to each other by being inserted into a shaped connection hole, and a fin is provided between adjacent elements and the middle part is partitioned off by a partition wall. In an evaporator configured by providing a refrigerant inlet on one side of the first tank and a refrigerant outlet on the other side, the first and second tanks are connected at the edge of the joint. An evaporator characterized by an arc-shaped cutout in the inner part. 3. The evaporator according to claim 2, wherein the edge of the joint inserted into the connection hole formed on one side of the first tank is cut out to a larger extent closer to the refrigerant inlet. . 4. According to any one of claims 2 to 3, the edge of the joint inserted into the connection hole formed in the downstream half of the second tank is cut out to be larger toward the upstream side. evaporator.