JPS62171572A - Check valve for refrigerating cycle - Google Patents

Abstract

PURPOSE:To weld a lower plate, an upper plate, a partition board and a reed valve as a unit, by irradiating a laser beam or the like from the outside to the periphery of a lower recess, an upper recess, an inlet recess and an outlet recess. CONSTITUTION:A check valve for a refrigerating cycle is mainly composed of a lower plate 6, an upper plate 7, a partition board 8 and a reed valve 9. The lower plate 6 is bonded to the upper plate 7, and the reed valve 9, a spacer 16, a filter plate 19 and an orifice plate 17 are accommodated in a space between the lower plate 6 and the upper plate 7. Then, a laser beam or an electron beam is irradiated from the outside to the periphery of an upper recess 14, a lower recess 11, an inlet recess 13 and an outlet recess 15. Thus, the plates 6 and 7, the reed valve 9, the spacer 16, the filter plate 19 and the orifice plate 17 are welded as a unit.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a check valve for a refrigeration cycle suitable for preventing backflow of refrigerant.

(B) Conventional technology A conventional check valve is, for example, a cylindrical pipe (1) as shown in FIG. ), and a slide valve (5) equipped with a valve (4) for opening and closing this refrigerant flow hole (a) is provided so that the refrigerant flows freely from the seat (3) to the slide valve (5) side, and vice versa. When the refrigerant tries to flow in the same direction, the slide valve (5) closes to the seat (5) due to the pressure difference.
3), the valve (4) closes the communication hole (2J).

Such a pipe (1) is formed, for example, in a size of about 1/4 to 5/1 G inch, and is inserted into the refrigerant piping by, for example, an O-joint.

(c) Problems to be solved by the invention However, if a refrigeration cycle is formed using this method of forming cycle parts individually, connecting each part with piping, and then welding the joints, This is troublesome and requires a large amount of installation space, and there are also problems in that it is easy to take pictures and generate noise.

Therefore, as the background of this invention, various cycle parts and piping, including this valve and excluding the heat exchanger, are integrated by joining two metal plates, and these are welded all at once using, for example, laser beam welding to construct a cycle. There are attempts to reduce vibration and noise by making the cycle easier to form, more compact, and by making the cycle parts into a single rigid body.

In view of the above-mentioned points, it is an object of the present invention to provide a check valve for a refrigeration cycle that can be used in a cycle in which the two metal plates are joined together and various cycle parts are welded all at once.

2) Means for Solving Problems The present invention is a check valve for a refrigeration cycle, which includes a step recess that bulges downward, and a step recess that expands downward from the step recess that is formed at approximately the middle part of the step recess. A metal lower plate having a lower recess for exiting and an inlet recess bulging downward to connect the lower recess with the outside, and a metal plate facing and joining the lower plate. To connect the outside with an upper recess that bulges upward in substantially the same shape and size as the lower recess formed in the opposing region, and an upper recess that is formed by expanding upward in a region other than the region that opposes the entrance recess. When an upper plate having an outlet recess of 1 and a lower plate and an upper plate that are engaged and stored in the stepped recess so as to cover the lower recess are joined, the inlet recess and the outlet recess are in a relatively connected state. A reed valve is provided in the approximate center of the partition plate, and a refrigerant flow hole is provided approximately in the center of the partition plate. The reed valve is provided with an opening formed in a spiral shape from the center toward the periphery so that a closing part that closes the refrigerant flow hole is formed in a portion corresponding to the refrigerant flow hole, and the lower plate and the upper plate are connected to each other. The lower plate, upper plate, partition plate, and reed valve are welded together by irradiating the peripheral parts of the lower recess, upper recess, entrance recess, and exit recess with a laser beam or electron beam from the outside. It is.

(E) Function At dawn, when refrigerant is supplied from the inlet recess of the lower plate to the lower recess, the refrigerant supply pressure pushes up the closed part of the reed valve, opens the refrigerant flow hole, and the refrigerant enters the upper recess. After that, the refrigerant is discharged to the outside from the outlet recess of the upper plate. On the other hand, when the refrigerant pressure in the upper section is higher than the refrigerant pressure in the lower recess, the pressure difference presses the closing part of the reed valve, closing the passage hole and blocking the refrigerant. It is designed to prevent backflow.

(f) Example The present invention will be described in detail below based on embodiments shown in the figures.

In Figures 1 and 2, the refrigeration cycle check valve is
Lower plate (6), upper plate (force, partition plate (8)
and a reed valve (9).

The lower plate (6) is a press-molded product made of a rectangular metal plate made of stainless steel, for example, and has a circular step recess □□□ and a step recess (G) in the center that bulges downward. A circular lower recess is formed that bulges downward from the stepped recess (10) formed in the center, and connects the lower recess (11J and the outside) toward the lower recess (11) from the - side thereof. Therefore, an entrance recess (131) with a semicircular cross section that bulges downward is formed.

The upper plate (7) is a press-formed product made of a rectangular metal plate made of stainless steel, for example, and is joined to face the lower plate (6), and the portion facing the lower recess (11) has: An upper recess (14) having the same shape and dimensions as the lower recess opening 1) of the lower plate (6) and bulging upward is formed, and the upper recess 041 and the outside extend from the - side toward the upper recess (14). An exit recess 05) having a semicircular cross section is bulged upward to connect the two.

Note that the outlet recess 051 is formed at a location opposite to the inlet recess 03) in the figure.

The partition plate (8) is located in the lower recess (11) of the lower plate (6).
It is a stainless steel disc that is engaged and stored in the stepped recess (K) so as to cover the lower recess (1) of the lower plate (6).
Consisting of a spacer (16) on the υ side and an orifice plate surface on the upper side of this spacer, when the lower plate (6) and upper plate (7) are joined, the inlet recess 031 of the lower plate (6) and the outlet recess 05 of the upper plate (7) in a non-communicating state. On the orifice plate side, a refrigerant flow hole is provided in the center thereof, and a fitting hole &I+ is provided in the center of the spacer 06) into which a recess 2 of the filter plate, which will be described later, is fitted. Orifice plate 07) and spacer (16)
A partition plate (a filter plate of the same type and size as the filter plate) is inserted between the filter plate and the filter plate (+91 is made of stainless steel and has a recessed part 4 that bulges downward). It rectifies the flow of refrigerant flowing through the lower recess (11) and the upper recess (11) and filters out dirt and the like.

The reed valve (9) is made of a relatively thin metal material with excellent elasticity and has the same shape and dimensions as the orifice plate a7). This reed valve is placed on the top surface of the plate A.This reed valve is provided with an opening (support) formed in a spiral shape from the center toward the periphery. In the center of the reed valve (9) corresponding to the Platero refrigerant flow hole (2),
A closing portion that opens and closes the refrigerant flow hole portion is formed by the opening portion.

The lower plate (6) and upper plate (7) configured as above are joined, and inside these, the reed valve (9), spacer (16), filter plate, and orifice plate [1] are installed. ? ) is housed, irradiate the same edges of the upper recess (14), lower recess (1υ, entrance recess f13+, and exit recess (15)) with a laser beam or electron beam from the outside as shown by the broken line in Figure 2. As a result, both plates +61 (711 reed valve (9), spacer 06), filter plate 0, and orifice plate a''n are welded together.

This welding creates a lower plate (6) on the right side of Figure 2.
A sealed refrigerant supply path is formed by the entrance recess (131), and this supply path is communicated with the space formed by the spacer color and the lower recess (11). A refrigerant discharge passage sealed by the upper plate (sword outlet recess 05) is formed on the left side of Fig. 2, and this discharge passage communicates with the space formed by the reed valve (9) and the upper recess). be done.

Next, the operation of the above-mentioned check valve will be explained.

First, the refrigerant flowing from the inlet recess 03) flows into the lower plate (
6) into the lower recess (11). Here, if the pressure in the upper plate (upper recess M) is lower than the pressure in the lower recess (1υ) of the lower plate (6), the refrigerant pushes up the rJ1 blockage of the reed valve (9). The refrigerant then flows into the upper recess (14) of the upper plate (7).Then, the refrigerant is discharged to the outside from the outlet recess (151).

On the other hand, when the pressure in the upper recess (14) of the upper plate (7) becomes higher than the pressure in the lower recess (11) of the lower plate (6), the pressure difference causes the closed part ( Since the refrigerant flow hole (c) is closed, the refrigerant does not enter the upper recess (14) of the upper plate ('/) into the lower recess (11) of the lower plate (6). backflow is prevented.

By forming the opening of the reed valve (9) in a spiral shape as described above, the refrigerant flow hole (
181 The length of the arm for opening and closing can be increased.

Therefore, the refrigerant flow hole (181) can be opened and closed with a small pressure difference, and the reed valve itself can be made compact.

In addition, integrally with the upper plate (6) and the lower plate (6), for example, an accumulator, receiver, capillary tube, check valve, continuation of piping for connecting these cycle parts, etc. are formed, and the upper plate and the lower plate (6) are formed. By joining the plates and welding both plates by irradiating them with a laser beam in the same manner as above, the formation of these cycle parts and the connection of piping can be done in one step by two processes: joining and welding. Since the process can be carried out using a device, manufacturing the cycle becomes extremely easy.

Furthermore, by integrating these various parts, the cycle parts and piping system can be configured as a single rigid body.
Cycle vibration and noise can be suppressed.

(G) Effects of the invention According to this invention, it is extremely easy to manufacture a refrigeration cycle, and vibration and noise of the cycle can be suppressed.Furthermore, the refrigerant flow holes can be opened and closed with a small pressure difference. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the invention, FIG. 3 is a perspective view of a conventional example, and FIG. 4 is a sectional view of a conventional example. (6)...Lower plate, (sword...
・Top plate, (8)...Partition plate,
(9)...Reed valve, 00)...
- Paragraph recess, (11)...lower recess,
(131...Entrance recess, 閤)...
... Upper recess, 05) ... Outlet recess,
08)...refrigerant flow hole, hole...opening, (c)...blockage. Figure 1 Figure 2

Claims (1)

[Claims] 1. A step recess that bulges out downward, a lower recess that bulges out below the step recess formed approximately in the center of the step recess, and an inlet recess that bulges out downward to connect the lower recess and the outside. an upper recess that bulges upward in substantially the same shape and size as the lower recess formed at a portion facing the lower recess, and an upper recess formed in a portion facing the lower recess; an upper plate having an outlet recess for connecting the upper recess and the outside, formed by expanding upward in a portion other than the portion facing the entrance recess; and an upper plate that is engaged and stored in the stepped recess so as to cover the lower recess. A metal partition plate that partitions the inlet recess and the outlet recess into a non-communicating state when the lower plate and the upper plate are joined together, and a metal plate-shaped lead placed on the upper plate side of this partition plate. A reed valve is provided with a refrigerant flow hole in a substantially central portion of the partition plate, and a blockage portion is formed at a portion corresponding to the refrigerant flow hole of the reed valve to close the refrigerant flow hole. A spiral opening is provided from the center toward the periphery, the lower plate and the upper plate are joined, and a laser beam is applied from the outside to the peripheral areas of the lower recess, the upper recess, the entrance recess, and the exit recess. Or a check valve for a refrigeration cycle in which a lower plate, an upper plate, a partition plate, and a reed valve are welded together by irradiation with an electron beam.