JPH0796982B2 - Stacked heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a laminated heat exchanger applied to a refrigerant evaporator of an automobile air conditioner, and relates to a joint structure of an inlet pipe, an outlet pipe, and the like.

[Prior Art] A laminated heat exchanger used in a refrigerant evaporator of an air conditioner for an automobile is conventionally formed by laminating a large number of molded plates as disclosed in Japanese Utility Model Laid-Open No. 60-50380. The laminated molding plates form an inlet tank portion, an outlet tank portion, and a plurality of refrigerant passages communicating with the inlet tank portion and the outlet tank portion, and between the plurality of refrigerant passages, respectively. A radiating fin is provided,
These refrigerant passages and heat radiation fins are alternately stacked.

An inlet tank portion and an outlet tank portion that communicate with the plurality of refrigerant passages are formed in the forming plate, and the refrigerant that has flowed into the inlet tank portion is distributed to the respective refrigerant passages and is then flowed. The refrigerant is configured to exchange heat with the outside air through the heat radiation fins joined to the respective refrigerant passages, return these refrigerants to the outlet tank portion, and let them flow out from the outlet tank portion.

An inlet pipe and an outlet pipe are joined to the inlet tank portion and the outlet tank portion, respectively, and the refrigerant is introduced and led out through these pipes.

The structure of joining the inlet pipe and the outlet pipe to the inlet tank portion and the outlet tank portion, respectively, will be described with reference to the conventional case shown in the above publication.

That is, reference numeral 1 shown in FIG. 4 is a core portion, and the core portion 1 is formed by stacking a plurality of joint structures in which a pair of molding plates 6a, 6b, ... 3 and ...

The pair of molding plates 6a, 6b are each made of a press-molded double-sided clad plate or the like, and each has a first bulge space 7 for forming the inlet tank portion 4 and a first bulging space 7 for forming the outlet tank portion 5. 2 bulging spaces 8 and a plurality of bulging spaces 8 connected to the first bulging space 7 and the second bulging space 8 and having a smaller bulging amount than the first bulging space 7 and the second bulging space 8. Third bulge space 9 ... (See FIG. 6)
And a pair of molding plates 6 having such a shape.
The inlet tank part 4 is formed between the first bulging spaces 7 and 7 by connecting the a and 6b to each other and joining the peripheral portions thereof, and between the second bulging spaces 8 and 8. An outlet tank portion 5 is formed, and a plurality of third bulging spaces 9, 9 are formed.
Flat tube-shaped refrigerant passages 2 ... Which extend in a substantially U shape and whose both ends are connected to the inlet tank portion 4 and the outlet tank portion 5 are formed.

A large number of such one set of molding plates 6a, 6b are stacked, and the inlet tank section 4 ... And the outlet tank section 5 of each group are formed on the respective molding plates 6a, 6b. .. and 10b .., which are communicated with each other, and which are adjacent to each other, are connected to the inlet tank portion 4 ... and the outlet tank portion 5 ...
Are electrically connected to each other and are configured to extend in the left-right direction in FIG. Therefore, when the refrigerant is supplied to the inlet tank portions 4, ..., The refrigerant flows from the inlet tank portions 4, ... through the respective refrigerant passages 2, ..., To the outlet tank portions 5, ..., thereby forming a refrigerant flow path.

The fins 3 ... Are corrugated fins, for example, and as shown in FIG.
The third bulging spaces 9 of a and 6b are joined by brazing to enable heat transfer with the refrigerant passages 2.

In the core portion 1 having such a structure, an inlet pipe 11 is connected to one side of the inlet tank portion 4, and an outlet pipe 12 is connected to the outlet tank portion 5.

The inlet pipe 11 and the outlet pipe 12 are connected as follows. That is, to explain on the inlet pipe 11 side as a representative, the inlet pipe 11 is a pipe having a circular cross section, but it is formed into a flat cross section so that the end portion of the core portion 1 connected to the inlet tank portion 4 becomes a flat space. The open end is liquid-tightly closed by brazing the end cap 13.

An inlet 14 is opened on one side wall of the inlet pipe 11.

Such an inlet pipe 11 is sandwiched between the side plate 15 and the forming plate 6a located at the end in the stacking direction, and the pipe is arranged along the surface of the forming plate 6a. The inflow port 14 opened on the side wall of the inlet pipe 11 is opposed to communicate with the communication port 10a formed in the molding plate 6a so as to communicate with the inlet tank portion 4, and in this state, the inflow port 14 The peripheral portion A is joined to the molding plate 6a by brazing.

Inlet pipe 11 and outlet pipe 12 configured as above
Is assembled in advance to the core portion 1 so as to have a predetermined joint structure, and these are held by a jig and placed in a heating furnace so that the brazing material provided at each joint portion is heated and melted. The predetermined brazing is carried out.

In the laminated heat exchanger having such a configuration, when the refrigerant is sent from the inlet pipe 11, the refrigerant flows into the inlet tank portion 4 through the inflow port 14 and the communication port 10a. Inlet tank part 4 ...
Then, the refrigerant flows into the plurality of refrigerant passages 2 ...
The refrigerant passing through these refrigerant passages 2 ...
It flows into and gathers. The refrigerant in the outlet tank section 5 is
Outlet pipe 12 through communication port 10b and outlet (not shown)
And is sent to the compressor side through the outlet pipe 12.

Then, heat is exchanged with the outside air through the heat radiation fins 3 in the process in which the refrigerant distributes through the plurality of refrigerant passages 2 and flows.

[Problems to be Solved by the Invention] In the heat exchanger as described above, the inlet pipe 11 and the outlet pipe 12 are respectively arranged along the surface of the molded plate 6a with respect to the molded plate 6a at the endmost portion. It is piped and is brazed to the forming plate 6a around the periphery A of the inflow port 14 and the outflow port. That is, the side walls of the inlet pipe 11 and the outlet pipe 12 are joined to the forming plate 6a by means such as brazing, so that the inlet pipe 11 and the outlet pipe 12 do not protrude in the width direction of the core portion 1. The width of the core portion 1 is made compact.

However, with such a structure, pipes 11 and 12
The pipes 11 and 12 are connected to the forming plate 6a.
Since it is only the side wall of, the joint strength is low, stress is concentrated at the joint when load is applied to the own weight and the tip of the pipes 11 and 12, especially when a torsion load is applied,
Detachment and joint failure are likely to occur.

In addition, since the joint strength is low, the weight of the pipes 11 and 12 acts during the process of brazing in the heating furnace, and the entire core portion 1 is thermally contracted due to melting of the brazing material. When it occurs, the inlet pipe 11 and the outlet pipe 12 may be joined in an inclined abnormal mounting posture C with respect to the regular mounting posture B shown in FIG. When the inlet pipe 11 and the outlet pipe 12 are joined in the inclined mounting posture C, the circumference A of the inlet 14 with respect to the forming plate 6a
There is a concern that a defective joint may occur at the portion and the refrigerant may easily leak.

The present invention has been made based on such a situation, and the joining strength of pipes is increased, the pipes can be joined in a proper mounting posture, and the leakage of the refrigerant at the joining portion can be prevented. It is intended to provide a container.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a structure in which a large number of molding plates are laminated to form an inlet tank portion, an outlet tank portion, and the inlet tank portion and the outlet tank. A plurality of refrigerant passages communicated with the section, the molding plate located at the outermost end is provided with communication holes respectively communicating with the inlet tank section and the outlet tank section, and the molded plate located at the outermost section is formed. , The inlet pipe and the outlet pipe, open the inlet and the outlet on each side of the inlet pipe and the outlet pipe, and connect the inlet and the outlet to the respective communication holes of the shaping plate at the end. Joining the inlet pipe and the outlet pipe to the molding plate at the end, and disposing a radiation fin between the plurality of refrigerant passages, The refrigerant is guided from the mouth pipe to the inlet tank portion, the refrigerant is distributed from the inlet tank portion to the plurality of the refrigerant passages and flows, the refrigerant is returned from the refrigerant passage to the outlet tank portion, and flows out from the outlet tank portion through the outlet pipe. In the laminated heat exchanger, the at least one of the inlet pipe and the outlet pipe is
It is characterized in that an end cap is provided at the end of the pipe, and the end cap and the molding plate located at the outermost end are connected.

[Operation] According to the present invention, at least one of the inlet pipe and the outlet pipe is connected to the forming plate located at the endmost portion by the end cap of the pipe, so that the pipe flows against the forming plate. In addition to the perimeter of the inlet or outlet, it will also be joined at the end cap part,
It will be supported at two places separated from each other.

Therefore, the connection strength between the pipe and the forming plate is increased, the pipe is less likely to come off, the inclination of the pipe is prevented, the joint around the inflow port or the outflow port is reliably maintained, and the leakage of the refrigerant is prevented.

[Embodiment of the Invention] Hereinafter, the present invention will be described based on a first embodiment shown in FIG.

In the present embodiment, the overall structure of the core part may be the same as the conventional structure, and therefore the description of the overall structure is omitted and only the essential parts will be described based on FIG. 1 showing the portions corresponding to FIG. To do.

In this embodiment, the end portion of the inlet pipe 11 is closed by the end cap 20. The end cap 20 is integrally configured by the molding plate 6a located at the most end in the stacking direction. That is, the peripheral edge where the pair of molding plates 6a and 6b are bonded to each other has a rib portion for bonding to one of the molding plates 6a.
In this embodiment, the rib 21 is extended to integrally form the end cap 20, and the end cap 20 is liquid-tight to the end of the inlet pipe 11. The end portion of the inlet pipe 11 is closed by attaching it.

In this way, the inlet pipe 11 will be joined to the shaping plate 6a at the outermost end at two locations, the location of the end cap 20 and the area A around the inflow port 14. Strength is improved.

Therefore, the connection strength between the pipe 11 and the molding plate 6a is increased, and the pipe 11 is hard to come off.

Further, the mounting posture of the inlet pipe 11 is maintained in the regular posture B. That is, when heated in a heating furnace, the pipe
The pipe 11 is not tilted by its own weight, and the ratio of displacement of the pipe 11 due to the contraction of the core portion 1 is reduced.

Therefore, reliable joining is maintained in the area A around the inlet 14 of the inlet pipe 11, and the leakage of the refrigerant is prevented.

Moreover, since the end cap 20 is integrally formed from the rib portion 21 of the molding plate 6a, the number of parts is reduced and the structure is simplified.

In the second embodiment shown in FIG. 2, a part of the end cap 30 that closes the end of the inlet pipe 11 is extended, and this extended end is brazed to the rib portion 21 of the forming plate 6a.

In this case, the end cap 30 is joined to the end of the inlet pipe 11 in advance, and the end cap 30 is used when heating in the heating furnace.
The 30 may be brazed to the rib portion 21 of the forming plate 6a.

In the case of the third embodiment shown in FIG. 3, the end portion of the inlet pipe 11 is crushed, the crushed end portion 40 is liquid-tightly closed by brazing 42, and the crushed end portion 40 is formed. The plate 6a is covered with an end cap 41 extending from the rib portion 21, and the end cap 41 is brazed to the crushed end 40.

In this way, the end portion of the inlet pipe 11 is the crushed end portion.
Not only is it blocked by 40 and the brazing material 42, but it is covered by the end cap 41 and further brazed, so that the structure is double-closed, and the end of the inlet pipe 11 is more reliably blocked, It is possible to reliably prevent the refrigerant from leaking from this portion. Moreover, the inlet pipe 11 is joined to the molded plate 6a at the most end portion at the two places of the end cap 41 and the peripheral portion A of the inflow port 14, so that the mechanical coupling strength is improved. The inlet pipe 11 can be prevented from coming off, and the inlet pipe 11 can be mounted in the proper posture B.

In each of the above embodiments, the case where the inlet pipe 11 is joined has been described, but it goes without saying that the present invention can be applied to the outlet pipe 12 side, and either one of them may be implemented.

As described above, according to the present invention, even if the pipe is arranged along the forming plate, the end portion of the pipe is connected to the outermost forming plate by the end cap,
The pipe will be joined to the endmost molded plate at the side of the inlet or outlet perimeter as well as at the end cap. Therefore, the pipes are supported at two places separated from each other, and the joint strength is improved. For this reason, even though the pipe is arranged along the forming plate, the pipe is prevented from coming off and the pipe is prevented from tilting, so that the joint around the inlet and the outlet is surely maintained and the leakage occurs. There is no need to worry.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, a sectional view showing the same portion as FIG. 5, FIG. 2 is a sectional view showing a second embodiment of the present invention, and FIG. 3 is a sectional view of the present invention. 3 is a sectional view showing an embodiment, FIGS. 4 to 6 show a conventional structure, FIG. 4 is a front view of a laminated heat exchanger, and FIG. 5 is a sectional view taken along line VV in FIG. , FIG. 6 is a sectional view taken along line VI-VI in FIG. 1 ... Core part, 2 ... Refrigerant passage, 3 ... Fin, 4 ...
Inlet tank part, 5 ... Outlet tank part, 6a, 6b ... Forming plate, 11 ... Inlet pipe, 12 ... Outlet pipe, 14 ...
Inlet, 20,30,41 …… End cap, 21 …… Rib part, 40
…… Crush processing section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Yamamoto, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor, Yoshio Miyata, 1-1, Showa-cho, Kariya city, Aichi prefecture Incorporated (72) Inventor Toshio Ohara 1-1-chome, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (56) References 60-81488 (JP, U) 61-156860 (JP) , U) Actual development Sho 58-162474 (JP, U) Actual development Sho 54-94659 (JP, U)

Claims (4)

[Claims] 1. A plurality of forming plates are laminated to form an inlet tank part, an outlet tank part, and a plurality of refrigerant passages communicating with the inlet tank part and the outlet tank part. A communication hole communicating with the inlet tank section and the outlet tank section is formed in the forming plate located at the end, and the inlet pipe and the outlet pipe are arranged along the forming plate located at the end. An inlet and an outlet on each side of the outlet pipe and the outlet pipe, and connecting the inlet and the outlet to the respective communication holes of the shaping plate at the end, and the side walls of the inlet pipe and the outlet pipe at the end. The fins are joined to the molded plate of the above, and fins are arranged between the plurality of refrigerant passages. In the laminated heat exchanger, the medium is distributed from the inlet tank portion to the plurality of the refrigerant passages and flows, the refrigerant is returned from the refrigerant passages to the outlet tank portion, and the refrigerant flows out from the outlet tank portion through the outlet pipe. At least one of the inlet pipe and the outlet pipe is
An end cap is provided at an end of a pipe, and the end cap and the molding plate located at the outermost end are connected to each other, wherein the laminated heat exchanger is characterized. 2. The laminated heat exchanger according to claim 1, wherein the end caps of the pipes are connected to the joint edges of the pair of molding plates. 3. The laminated heat generator according to claim 1, wherein the end cap of the pipe is formed by integrally extending from the shaping plate at the endmost portion. Exchanger. 4. The end portion of the pipe is crushed to be closed, and the crush closing portion is covered with an end cap integrally extended from the molding plate at the outermost end. The laminated heat exchanger according to claim 3.