JPH0886535A - Laminated heat exchanger - Google Patents

Abstract

PURPOSE: To allow an expansion valve to be mounted at a plate for forming the exit/entrance passage of a laminated heat exchanger despite the elimination of an expansion valve mounting member. CONSTITUTION: Holes 2, 23 are opened at a pair of swelling parts 20a, 20b of a plate 20 forming an exist/entrance passage, and pipes 30, 31 with collars are temporarily respectively mounted at such holes 2, 23. Two insertion holes 28 are opened at the plate 20, and pipes 35 formed with threads in inner holes are temporarily respectively mounted in the holes 28 The pipes 30, 31 and 35 and the plate 20 are brazed to a furnace, and the pipes 30, 32 and 35 are fixed to the plate 20. Thus, the inserting means and the sealing surface to the expansion valve are formed by the pipes 30, 31, and clamping means at the valve is formed by the pipe 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger used in, for example, a vehicle air conditioner, and more particularly to an improvement in a structure for connecting a block type expansion valve.

[0002]

2. Description of the Related Art As a structure for providing a block type expansion valve in the vicinity of the inlet / outlet of a conventional laminated heat exchanger, for example, the structure shown in FIGS. 1 and 2 of Japanese Utility Model Laid-Open No. 1-28762 is known. Is.

The structure of providing an expansion valve in the vicinity of the inlet / outlet portion of such a laminated heat exchanger will be outlined. A refrigerant inflow pipe 11 and a refrigerant outflow pipe 12 are provided in parallel at regular intervals. Then, the plate-shaped joint member 15 has an inflow pipe connection hole 17 and an outflow pipe connection hole 18 which have hole portions 17a and 18a having inner diameters into which the inflow pipe 11 and the refrigerant outflow pipe 12 can be inserted. It is provided. Further, the plate-shaped joint member 15 has a substantially cylindrical protrusion on the opposite side of the inflow pipe 11 and the refrigerant outflow pipe 12, the hole 17,
It is formed so as to project from the circular edge of 18. Further, the box-type expansion valve 16 is formed with through holes 25a, 25 having at least an inner diameter into which the projection of the plate-shaped joint member 15 can be fitted.

Next, the box type expansion valve 1 having the above structure
6, the refrigerant inflow pipe 11 and the refrigerant outflow pipe 12 are connected to the hole 17 of the plate-like joint member 15.
a, 18a, the projection of the plate-shaped joint member 15 is inserted into the holes 25a, 25b of the box-type expansion valve 16, and the plate-shaped member 15 and the box-type expansion valve 16 are screwed together. Will be fixed at.

However, in the structure in which the box-type expansion valve is mounted in the vicinity of the inlet and outlet of the laminated heat exchanger, a separate plate-shaped member for fixing the box-type expansion valve is required,
Due to the large number of parts, much labor is required for assembling the laminated heat exchanger itself, and the laminated heat exchanger has disadvantages such as a large weight.

[0006] Therefore, the applicant of the present application, 3-87
As shown in the specification of Japanese Patent Application No. 071 and in FIGS. 6 and 7, tubular portions 25a and 25b in which connection holes 22a and 22b are formed in the entrance / exit passage forming plate 21 adjacent to the end plate 4 are provided. Is directly inserted into the hole of the expansion valve 27, and extends from the end plate 4 in the ventilation direction, the inlet / outlet passage forming plate 21, and the expansion valve 27.
It has already been devised that the expansion valve mounting member (synonymous with the plate-shaped member 15 of the above embodiment) is unnecessary by fixing the screw with a screw.

[0007]

However, in the configuration of the invention shown as the above-mentioned conventional example, the extension portion is extended from the end plate in the ventilation direction, and the extension portion, the inlet / outlet passage forming plate, and the expansion member are also provided. There is a problem that the expansion valve cannot be fixed to the core of the laminated heat exchanger unless the valve is screwed from the anti-expansion valve side.

In view of the above problems, the present invention has been made in view of the above problems.
An object of the present invention is to provide a laminated heat exchanger that can fix an expansion valve without using a means for extending an extension valve mounting extension in the ventilation direction and without having a separate expansion valve mounting member. And

[0009]

SUMMARY OF THE INVENTION In the laminated heat exchanger according to the first aspect of the present invention, however, a pair of inlet / outlet passage forming plates having a pair of bulging portions is provided on the surface of the end plate to form a pair of inlet / outlet passages. Forming a hole in each of the pair of inlet and outlet passages, and inserting and brazing an expansion valve connecting flanged pipe into the hole to form an insertion portion and an expansion valve connecting seal surface, thereby forming the inlet and outlet passages. An expansion valve mounting screw is brazed to a pair of pipes each having an inner hole formed therein.

Further, in the laminated heat exchanger according to a second aspect of the present invention, the inlet / outlet passage forming plate having a pair of bulging portions is provided on the surface of the end plate to form a pair of inlet / outlet passages, and the pair of inlet / outlet passages are formed. A hole having an insertion portion at the periphery is formed in each of the passages, and the bulging portion is used as a sealing surface for connecting an expansion valve around the insertion portion, and an expansion valve mounting screw is formed in the inlet / outlet passage forming plate as an inner hole. The pair of pipes formed is brazed and attached.

[0011]

Therefore, according to the laminated heat exchanger of the first aspect, the expansion valve connecting plate is expanded by inserting and brazing the expansion valve connecting flange pipe into the hole formed in the expansion portion of the inlet / outlet passage forming plate. The insertion portion to the valve and the sealing surface for connecting the expansion valve are formed, and the pipe for forming the inlet / outlet passage forming plate is brazed to the pipe for forming the screw for the expansion valve. It

Further, according to the laminated heat exchanger of the second aspect, the insertion portion to the expansion valve is formed so as to extend to the peripheral edge of the hole of the bulging portion of the inlet / outlet passage forming plate, A sealing surface for connecting the expansion valve of the expansion valve is formed around the insertion portion of the bulging portion, and a pipe having a screw formed in the inner hole is brazed to the inlet / outlet passage forming plate, thereby forming an expansion valve and Is formed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

The laminated heat exchanger 1 is, for example, as shown in FIG. 1, a pair of tanks 8 and 9 having a communication hole 7 at one end.
And the fins 2 and the tube elements 3 each having a refrigerant passage 12 communicating between the tanks 8 and 9 are alternately laminated. The laminated heat exchanger 1 obtains a so-called four-pass refrigerant flow. Therefore, a tube element 3'having a blind tank (not shown) is interposed in the center in the stacking direction, and a communication pipe 15 is provided so that a pair of refrigerant inlets and outlets are provided on one end plate 4 side. Further, an inlet / outlet passage forming plate 20 is arranged to form inlet / outlet passages 22 and 24 communicating with the communication pipe 15 and the tank 8.

Therefore, the refrigerant flowing from the hole 23 of the inlet / outlet passage 24 flows into the tank group B through the communication pipe 15, and then flows into the tank C through the refrigerant passage 12 and the tank group through the communication hole 7. Sent to D. Then, after flowing into the tank group A through the refrigerant passage 12, it is a so-called four-pass refrigerant flow that flows out from the hole 21 through the inlet / outlet passage 20. The refrigerant flows in through the hole 21 of the inlet / outlet passage 20 and flows out through the hole 23 of the inlet / outlet passage 24 in FIG.
Of course, the flow may be the opposite of the flow of the refrigerant shown by the arrow.

However, the basic structure of the tube element, corrugated fins, etc. of this laminated heat exchanger is almost the same as the conventional one, and therefore its explanation is omitted and the end plate forming the main part of the invention of the present application is omitted. 4 and the vicinity of the entrance / exit passage forming plate 20 will be described as follows.

In FIG. 2, the end plate 4 is joined to the molding plate 6 at the center side in the stacking direction, so that the capacity of the refrigerant passage becomes half that of other tube elements as compared with other tube elements. A tank (not shown) and a tank (not shown) are formed.

Of these, the molding plate 6 is a clad material whose main material is aluminum and whose surface is clad with a brazing material. , 8a are formed so as to bulge, and a ridge 10 extends from substantially the center of the tank forming bulge portions 8a, 9a toward the side opposite to the tank. A substantially U-shaped coolant passage forming bulging portion 11 is formed which communicates with the bulging portions 8a and 9a. The tank forming bulge 8a and the tank forming bulge 9a
A groove portion 13 which is recessed inward is formed so that the communication pipe 15 is interposed between the groove portion 13 and. The tube element 3 which constitutes the majority of the laminated heat exchanger is constructed by joining two such shaped plates 6 in the middle.

The end plate 4 is made of a flat plate of aluminum as a main raw material and is a clad material having a brazing clad on the surface thereof to close the molding plate 6 located at the end and to correspond to the groove portion 13 of the molding plate 6. It has an inlet / outlet hole 16 which is opened at a position where the relay pipe 15 is fitted and an inlet / outlet hole 17 which is opened at a position corresponding to the tank forming bulge portion 8a of the molding plate 6.

An inlet / outlet passage forming plate 20 is disposed outside the end plate 4 in the stacking direction. The inlet / outlet passage forming plate 20 is also made of a clad material obtained by clad brazing using aluminum as a main raw material. ing.

As shown in FIGS. 2 and 3, the inlet / outlet passage forming plate 20 has a bulging portion 20a having a hole 21 into which a flanged pipe 30 for connecting an expansion valve described below is mounted. A bulging portion 20 having a hole 23 into which a flanged pipe 31 for connecting an expansion valve described below is mounted
By closing the bulging portions 20a and 20b with the end plate 4, the inlet / outlet passage 22 communicating the inlet / outlet hole 17 of the end plate 4 and the hole 21 of the bulging portion 20a, and the end plate 4 are provided. Entrance / exit hole 16 and bulge 20
An inlet / outlet passage 24 that communicates with the hole 23 formed in b is formed.

Incidentally, the hole 21 of the bulged portion 20a (20b).
As shown in FIGS. 2 to 4, (23) is burred to facilitate the positioning of the expansion valve connecting flanged pipe 30 (31) when it is mounted, and is axially extended from its peripheral edge. A cylindrical portion 25 (26) is formed.

Further, the entrance / exit passage forming plate 20
In the flat plate portion between the inlet / outlet passage 22 and the inlet / outlet passage 24, mounting holes 28, 28 for mounting a pipe 35 described below are attached.
Are formed side by side at predetermined intervals in the vertical direction. However, since the mounting hole 28 is closed by the end plate 4, the mounting hole 28 is as deep as the thickness of the entrance / exit passage forming plate 20.

Collared pipes 30, 31 for connecting expansion valves
Are inserted into the fitting holes 41 and 42 of the expansion valve 40, respectively, and basically consist of a cylindrical portion having an outer diameter substantially the same as the inner diameter of the holes 21 and 23 and the cylindrical portions 25 and 26. In addition, a flange portion 32 is formed at a predetermined position by, for example, pressing to seal the fitting holes 41 and 42.

The pipes 35, 35 are for communicating with the screw holes 43, 43 of the expansion valve 40 and for fixing the expansion valve 40 to the laminated heat exchanger with the screw 45, and the inner hole 36 thereof is shown in FIG. Threaded as shown.

The process of the structure for attaching the expansion valve 40 to the inlet / outlet passage forming plate 20 will be described based on the above configuration. The fin 2 and the tube elements 3a, 3b, 3 will be described.
By stacking a plurality of c and end plates 4 and 5 at both ends in the stacking direction, and further arranging the inlet / outlet passage forming plate 20 outside the end plate 4, the core of the stacked heat exchanger is formed. Temporarily assemble.

Next, as shown in FIG. 2, the expansion valve connecting flanged pipes 30 and 31 are temporarily assembled into the holes 21 and 23 of the inlet / outlet passage forming plate 20 to bring them into the state shown in FIG. The pipes 35, 35 are temporarily assembled in the mounting holes 28, 28, and the state shown in FIG. 5 is obtained. In this case, mounting hole 2
8 does not communicate with the inside of the laminated heat exchanger by the end plate 4 and only the tip of the pipe 35 is inserted, so that the pipe 35 does not drop into the laminated heat exchanger,
Proper positioning is possible.

Further, the core of the laminated heat exchanger in which the expansion valve connecting ribbed pipes 30 and 31 and the pipes 35 and 35 are temporarily assembled is put into a furnace. As a result, the laminated heat exchanger 1 is assembled by brazing in the furnace, and the expansion valve connecting pipes 30 and 31 and the pipes 35 and 35 are connected.
Also, since the inlet / outlet passage forming plate 20 and the end plate 4 are made of a clad material, the portion in contact with the inlet / outlet passage forming plate 20 or the end plate 4 is brazed in the furnace to form a side surface of the laminated heat exchanger 1. Will be attached to.

Therefore, as shown in FIG. 7, the expansion valve 40
The fitting holes 41, 42 of the pipe 3 with the flange for connecting the expansion valve
By fitting the O-rings 45, 45 onto the 0, 31, while fitting the O-rings 45, 45, the screw holes 43, 43 of the expansion valve 40 and the pipe 35.
After arranging the expansion valve 40 at a position communicating with the inner hole 36 of the expansion valve 40, the screws 45, 45 are inserted through the screw holes 43 on the expansion valve 40 side and screwed to fix the expansion valve 40. It can be fixed to the center of the side surface of 1.

Incidentally, the flanged pipe 3 for connecting the expansion valve
Although it has been stated that the cylindrical portions 25 and 26 are formed by burring on the periphery of the holes 21 and 23 into which 0 and 31 are inserted, the cylindrical portions 25 and 26 are not necessarily limited to this. For example, as shown in FIG. Even if it is lost, the entrance passage forming plate 2
It is acceptable because brazing can be performed at the portions where 0 and the flanged pipes 30 and 31 for connecting the expansion valve abut.

FIG. 9 shows another embodiment of the present invention, in which the expansion valve connecting flanged pipes 30 and 31 are eliminated and the expansion valves 20a and 20b are extended to the periphery of the holes 21 and 23. The formed insertion portions 25 'and 26' are fitted into the fitting hole 4 of the expansion valve 40.
O-ring 4
By interposing 4, 45, the fitting can be properly performed, and the fitting holes 41, 42 can be sealed around the insertion portions 25 ', 26'. Since the other structures are the same as those of the above-mentioned embodiment, the same reference numerals are given and the description thereof is omitted.

[0032]

As described above, according to the laminated heat exchanger of the first aspect, the brazing pipe for connecting the expansion valve is inserted and brazed into the hole formed in the bulging portion of the plate for forming the inlet / outlet passage. By doing so, the insertion part to the expansion valve and the sealing surface for connecting the expansion valve are formed, and the pipe with the screw formed in the inner hole is brazed to the plate for forming the inlet / outlet passage, so that the screw with the expansion valve is screwed. Since the stop means is formed, it is possible to eliminate the need for the expansion valve mounting member which has been conventionally used, and reduce the number of parts.

Further, according to the laminated heat exchanger of the second aspect, the insertion portion to the expansion valve is formed by extending to the periphery of the hole of the bulging portion of the inlet / outlet passage forming plate, A sealing surface for connecting the expansion valve of the expansion valve is formed around the extending portion of the bulging portion, and a pipe having a screw formed in the inner hole is brazed to the inlet / outlet passage forming plate, so that the expansion valve The expansion valve mounting member which has been conventionally used can be eliminated, the number of parts can be reduced, and the parts (for connecting the expansion valve) can be further reduced from the invention according to claim 1. Brim pipe) can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a structure of a laminated heat exchanger according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a process of temporarily assembling a forming plate, an end plate, and an inlet / outlet passage forming plate at a side end of the above laminated heat exchanger.

FIG. 3 is an explanatory view showing a step of temporarily assembling the expansion valve connecting flanged pipe and the pipe to the inlet / outlet passage forming plate which is temporarily assembled to the above laminated heat exchanger.

FIG. 4 is an explanatory view showing a state in which the expansion valve connecting plate with a flange and the pipe are attached to the inlet / outlet passage forming plate.

FIG. 5: A of FIG. 3 of a flanged pipe for connecting an expansion valve of the same as above.
FIG.

FIG. 6 is a sectional view of the above pipe taken along line BB in FIG.

FIG. 7 is an explanatory view showing a step of mounting the expansion valve on the flanged pipe for connecting the expansion valve and the inlet / outlet passage forming plate mounted with the pipe.

FIG. 8 is an explanatory view showing a modified example of a state where the expansion pipe connecting flanged pipe is attached to the inlet / outlet passage forming plate.

FIG. 9 is an explanatory view showing another embodiment of the present invention and showing a step of attaching an expansion valve to the insertion portion of the inlet / outlet passage forming plate by the cylindrical portion formed in the connection hole of the inlet / outlet passage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated heat exchanger 20 Inlet / outlet passage forming plate 20a Bulging portion 20b Bulging portion 21 Hole 22 Outlet / inlet passageway 23 Hole 24 Outlet / inlet passageway 25 Cylindrical portion 26 Cylindrical portion 25 'Inserting portion 26' Inserting portion 28 Mounting hole 30, 31 Pipe with flange for connecting expansion valve 32 Flange 35 Pipe 36 Inner hole

Claims (2)

[Claims] 1. An inlet / outlet passage forming plate having a pair of bulging portions is provided on the surface of an end plate to form a pair of inlet / outlet passages, and a hole is formed in each of the pair of inlet / outlet passages. Insert a brazed pipe for connecting an expansion valve to form an insertion portion and a sealing surface for connecting an expansion valve, and then braze a pair of pipes with an expansion valve mounting screw formed in the inner hole on the inlet / outlet passage forming plate. A laminated heat exchanger, which is characterized by being installed. 2. An inlet / outlet passage forming plate having a pair of bulging portions is provided on a surface of the end plate to form a pair of inlet / outlet passages, and each of the pair of inlet / outlet passages has a hole having an insertion portion at a peripheral edge thereof. In addition, the bulging portion is used as a sealing surface for connecting the expansion valve around the insertion portion, and the pair of pipes having the expansion valve mounting screw formed in the inner hole are brazed and attached to the inlet / outlet passage forming plate. Is a laminated heat exchanger.