JPH0624675Y2 - Stacked heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a laminated heat exchanger, and in particular, aims to improve the structure near the inlet and outlet for connecting an expansion valve.

(Prior Art) Conventionally, in order to provide an expansion valve in the vicinity of the inlet / outlet of a laminated heat exchanger, as shown in, for example, Japanese Patent Laid-Open No. 63-238373, the inlet / outlet of a refrigerant is made by abutting two press-formed members. Forming a flat tube having, the flat tube is laminated with the tube element and arranged between the tube elements, and one end of the inlet / outlet pipe is fitted to the inlet / outlet of the flat tube,
An inlet / outlet joint connected to the inlet / outlet of the expansion valve is caulked to the other end of the inlet / outlet pipe via an expansion valve mounting member, and after brazing the whole of these in a furnace, the expansion valve is screwed to the expansion valve mounting member. It was fixed by means such as stopping.

That is, in order to install the expansion valve, in the vicinity of the inlet / outlet of the heat exchanger, a flat pipe having a two-divided structure on each of the outlet side and the inlet side, an inlet / outlet pipe and an inlet / outlet pipe joint are required. It was necessary to have a separate expansion valve mounting member for fixing the.

(Problems to be solved by the invention) Therefore, the number of parts is large, so the number of working steps is also large,
A lot of work was required to assemble the heat exchanger itself. Also, since the flat pipe inlet / outlet formed by abutting the press-formed members and the fitting portion of the inlet / outlet pipe, etc., are combined with three-point parts, air leakage due to wax breakage occurs after brazing in the furnace. In order to prevent this, strict control is required in terms of accuracy of parts dimensions and assembly accuracy, and if wear of the mold for molding these parts progresses, quality deterioration is likely to occur. There is.

Therefore, in the present invention, the above problems are solved, the structure near the inlet and outlet of the heat exchanger is simplified, and the easy assembly work of the heat exchanger can be realized, and the risk of wax breakage is reduced. The challenge is to provide a exchanger.

(Means for Solving the Problems) However, the gist of the present invention is that a plurality of tube elements and fins are alternately arranged side by side to provide end plates at both ends, and the tube is provided on one of the end plates. Forming an outlet / inlet of the refrigerant communicating with the element, forming an extension portion extending outward from the peripheral edge of the end plate, and providing an inlet / outlet passage forming plate on the surface of the end plate and the end plate. An inlet / outlet passage is formed between the inlet / outlet passage forming plate and the extension portion, the extension portion or the inlet / outlet passage forming plate is provided with a connection hole connected to an expansion valve and facing the inlet / outlet passage, and the expansion is performed. The valve is attached to the extension portion directly or via the inlet / outlet passage forming plate.

(Operation) Therefore, the end plate and the inlet / outlet passage forming plate form a refrigerant passage from the inlet / outlet formed in the end plate to the expansion valve, and the expansion valve is an extension portion formed integrally with the end plate. Therefore, even if a separate component such as an O-ring is required to assemble the expansion valve, the structure near the inlet and outlet of the heat exchanger can be a simple structure with a small number of components. It is possible to reduce the labor of the brazing work and to expect good brazing without strict part size or assembly management, and therefore the above problems can be achieved.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, the laminated heat exchanger is configured by alternately stacking tube elements 1 and fins 2 in a plurality of stages and disposing end plates 3 and 4 at both ends thereof.

The tube element 1 is formed by abutting two molding plates 5 and 5 at their peripheral edges, and each of the molding plates 5 and 5 is formed with a partition wall 6 extending from the center of the lower end to near the upper end. Two deep recesses 7 and 7 are formed on both sides of the lower part of the U-shaped shallow recess 8 extending from one deep recess to the other deep recess. Is formed. In addition, a central passage forming recess 9 is formed between the first and second deep recesses 7, 7 in the lower portion of the partition wall 6, and as a result, each tube element 1 has a first and a second recess. Two tank portions 10a, 10b, U-shaped refrigerant flow passage portion 10
A central passage portion 10d is formed between the tank c and the tank portions 10a and 10b.

The respective tank portions 10a and 10b and the central passage portion 10d are abutted against the tank portion and the central passage portion of the adjacent tube elements, respectively, and the communication holes 7a formed in the concave portions 7, 7, and 9 are formed. , 7a, 9a in the stacking direction. Further, the upper end of the tube element 1 is abutted by a joining piece 11 formed on each molding plate 5, and the fin 2 is formed by the joining piece 1
1 and the tank portions 10a and 10b.

One end plate 3 is bent toward the tube element so that the upper end of the end plate 3 comes into contact with the joint piece 11 of the tube element 5 arranged on the outermost side, and the deep recesses 7, 7 and the central passage forming recess 9 are formed at the lower end thereof. Is formed with a side path recessed portion 12 that abuts against. This bypass 12 is
A refrigerant side passage 14 is formed by being closed from the outside by a closing plate 13, and a communication hole 15 formed in the side passage recess 12 is formed.
The refrigerant side passage 14 is communicated with the second tank portion 10b and the central passage portion 10d by a and 15b.

On the other hand, the other end plate 4 remains the same in that its upper end is bent toward the tube element side and abuts on the joining piece 11, but the other end plate 4 has its lower end at the first tank portion 1
0a and the entrance / exit recess 16a that abuts on the central passage 10d,
16b is formed, and further, a step portion 17 that closes the communication hole 7a of the second tank portion 10b is formed. The entrance / exit 18 of the heat exchanger by the entrance / exit parts 16a and 16b
a and 18b are formed, and the entrances and exits 18a and 18b are communication holes 19 formed in the entrance and exit recesses 16a and 16b.
The first tank portion 10a and the central passage portion 10d are communicated with each other via a and 19b. Also, this end plate 4
Is formed with a substantially rectangular extension 20 extending outward from the peripheral edge of the end plate 4 along the flow direction of the air passing through the heat exchanger. A passage forming plate 21 is attached.

The entrance / exit formation plate 21 is attached so as to cover from the lower end of the end plate 4 to the extension portion 20, and inside thereof, a connection hole formed in the extension portion 20 from the entrance / exit recesses 16a and 16b. Entry / exit passage recesses 23a, 23 extending toward 22a, 22b
b is formed. Therefore, in the portion surrounded by the surface of the end plate 4 and the inlet / outlet passage recesses 23a, 23b, the inlet / outlet passage 24 leading from the inlet / outlet 19a, 19b of the heat exchanger to the connection holes 22a, 22b of the extension portion 20 is formed.
a and 24b are formed.

As shown in FIG. 3, the connecting holes 22a and 22b of the extending portion 20 are cylindrical portions 25 formed by burring.
a, 25a, and cylindrical portions 25a, 2a
5b is assembled to the expansion valve 27 via the O-rings 26a and 26b fitted on the outside of the 5b.
0 and screws 30 and 30 inserted through insertion holes 28 and 29 formed in the entrance / exit passage forming plate 21 are fixed to the extension portion 20.

The expansion valve 27 is a block type known per se, has a disk-shaped portion 31 accommodating a diaphragm at its upper end, and is an inflow for connecting the inlet side pipe 33a and the inlet side connection hole 22a into the box 32. Side connection path and an outflow side connection path connecting the outlet side pipe 33b and the outlet side connection hole 22b are formed, and the inflow side connection is made by moving the diaphragm according to the degree of superheat of the refrigerant flowing through the outflow side connection path. You can change the throttle of the road.

Then, the refrigerant sent to the expansion valve 27 via the inlet side pipe 33a is, as shown in FIG. 4, from the inlet / outlet port 18a of the heat exchanger through the inlet side connection hole 22a and the inlet / outlet passage 24a. First tank part 1 of each tube element
Enter 0a. Then, the first tank portion 10a is divided into the respective refrigerant flow passage portions 10c and rises, and makes a U-turn at the upper portion of each tube element to make the second tank portion 1
It reaches 0b, and heat is exchanged with the air passing between the fins 2 in this process. The refrigerant that has reached the second tank portion 10b merges here and is formed in the end plate 3 so that the refrigerant side passage 1 is formed.
4 to the central passage 10d, and then the doorway 18
It flows from b to the extension portion 20 through the outlet / inlet passage 24b on the outlet side, and flows out from the connection hole 22b to the outlet side pipe 33b via the expansion valve 27.

In order to assemble the heat exchanger having the above structure, first, the molding plates 5 and 5 are butted against each other and the tube element 1 is attached.
And the tube elements 1 and the fins 2 are alternately stacked. And the end plates 3 and 4 at both ends
Then, the closing plate 13 is applied to one of the end plates 3 from the outside, and the entrance / exit passage forming plate 21 is applied to the other end plate 4, and the whole is fixed with a jig. A brazing material is clad in advance in each of these parts. If the brazing is performed in the furnace in this assembled state, the heat exchanger assembling work is completed. After that, in order to form the refrigerant cycle, the tubular portion 25 of the extension portion 20 is formed.
The O-rings 26a and 26b are externally fitted to the a and 25b, the expansion valve 27 is screwed to the extending portion 20, and the pipe 33
It suffices to attach a and 33b to the expansion valve 27.

As described above, in this heat exchanger, in addition to the essentially necessary basic components (tube element, fin, end plate), the inlet / outlet passage forming plate 21 is simply overlapped with the mounting portion of the expansion valve 27 or the like. Since it is possible to form a refrigerant passage leading to, it is possible to have a simple structure with a small number of parts, which can be easily assembled, and at the time of brazing in the furnace, the brazing material surely flows into each joint. It is a thing.

In this embodiment, the connecting hole 22 of the extension 20 is
a, 22b and the cylindrical portion 2 formed integrally with the extending portion 20
5a and 25b, the fifth
As shown, a short flanged pipe 34
Is inserted into the insertion hole 35 formed in the extension portion 20, and the pipe 34
Alternatively, the flange portion 34a may be brought into contact with the surface of the extending portion 20 and brazed to form the structure.

6 and 7 show another embodiment of the present invention. The difference between this embodiment and the above embodiment is that the expansion valve 2
7 is arranged on the side of the entrance / exit passage forming plate 21 and the extending portion 2 is provided.
I just screwed it to 0. In this case, the inlet / outlet passage forming plate 21 is provided with connection holes 22a and 22b which are connected to the expansion valve 27. With such a configuration, the outlet side or inlet side pipes 33a and 33b do not hinder the flow of air, which is also advantageous in that the ventilation resistance can be reduced. Even in this case, the connection hole 2
2a and 22b may be configured by the tubular portions 25a and 25b, or may have the structure shown in FIG. Since the other points are the same as those of the above-mentioned embodiment, the description thereof will be omitted.

(Effect of the Invention) As described above, according to the present invention, the inlet / outlet of the refrigerant and the extension portion for mounting the expansion valve are formed in the end plate, and the inlet / outlet passage forming plate is used to form the inlet / outlet port. Since the refrigerant passage is formed from the extension part to the extension part, the structure in the vicinity of the inlet and outlet necessary for connecting the expansion valve can be made simple with a small number of parts, and easy assembling work is realized. In addition, the risk of wax breakage after brazing in the furnace can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a laminated heat exchanger according to the present invention,
2 is an enlarged perspective view of an essential part of the laminated heat exchanger in the above, FIG. 3 is an enlarged sectional view of an essential part of the laminated heat exchanger in the same, FIG. 4 is an explanatory view showing the flow of the refrigerant, and FIG. FIG. 6 is a sectional view showing another modification of the connection hole, FIG. 6 is an enlarged perspective view of an essential part of another embodiment of the present invention, and FIG. 7 is an enlarged sectional view of an essential part of the laminated heat exchanger of the above. Is. 1 ... Tube element, 2 ... Fin, 3, 4 ...
End plate, 18a, 18b ... Doorway, 20 ...
Extension part, 21 ... Plate for forming entrance / exit passage, 22a,
22b ... Connection hole, 23a, 23b ... Inlet / outlet passage recess, 27 ... Expansion valve.

Claims (1)

[Scope of utility model registration request] 1. A tube element and fins are alternately arranged in a plurality of stages and end plates are provided at both ends, and a refrigerant inlet / outlet communicating with the tube element is formed in one of the end plates, and the end plate is connected to the end plate. An extension portion is formed to extend outwardly from the peripheral edge thereof, and an entrance / exit passage forming plate is provided on the surface of the end plate to extend from the entrance / exit to the extension portion between the end plate and the entrance / exit passage forming plate. An inlet / outlet passage is formed, a connecting hole is provided in the extension portion or the inlet / outlet passage forming plate to connect to an expansion valve and faces the inlet / outlet passage, and the expansion valve is directly connected to the extending portion or the inlet / outlet passage forming plate. A laminated heat exchanger, characterized in that it is attached via.