JPH0730849B2 - Cartridge check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cartridge type reverse direction used for flow path formation and backflow prevention at the time of cycle switching of a heat pump cooling and heating device, high pressure gas backflow prevention when the compressor is stopped, and the like. Regarding stop valve.

[Conventional technology]

Conventional check valves of this type have used a metal ball as a valve element or a metal material manufactured by cutting or the like.

[Problems to be Solved by the Invention]

In such a conventional check valve, since the valve body is made of metal, there is a drawback that the weight of the valve body becomes large and the pressure loss becomes large, and there is also a drawback that squealing of the valve occurs accordingly.
On the other hand, attempts have been made to reduce the weight of the valve body by using synthetic resin such as Teflon, but in that case, since it is weak against heat,
The joint requires a certain length so as not to be affected by the heat from the high heat source, and there is a drawback that the entire apparatus becomes large. Further, in the conventional check valve, when the parts constituting the valve are incorporated into various devices, there is a drawback that the precision-finished valve seat is damaged especially during transportation or incorporation.

[Means for Solving the Problems]

In order to solve the above-mentioned drawbacks of the conventional check valve, the present invention punches a metal sheet having a groove on the outer periphery and a trapezoidal valve seat portion having an acute-angled top surface and a thin metal plate into a circular shape. And a plurality of legs provided with protrusions that guide the valve body and engage with the groove of the seat, and a plurality of inwardly hanging claw-shaped stoppers are provided on the upper portion. The present invention has a holder provided with a flow path formed between the foot and the stopper, whereby the entire valve is made into a cartridge and the valve body is made lighter.

[Work]

According to the present invention configured as described above, a lightweight valve body made of a thin metal plate is incorporated into a holder, and by inserting a seat, the legs of the holder are fitted into the grooves of the seat, and the whole is made into a cartridge. . In addition, the valve seat is trapezoidal and is formed on the acute-angled top surface, and the stopper is formed in the shape of a claw hanging inward, so the valve body made of a thin metal plate is lightweight, so when the refrigerant flow rate is low, the oil Even if the valve body adheres to the valve seat portion and the stopper due to, for example, the contact area between the valve body and the valve seat portion and the stopper is small, so that the valve body easily floats or falls with a small force.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The check valve of the present invention has a seat (1), a valve body (2), a holder (3) as shown in FIG.
The check valve (4) is constructed by assembling them as shown in FIG. The seat (1) has a through hole (5) in the center, and a valve seat portion (7) is formed on the upper surface (6) of the seat (1) so as to surround the through hole (5). The top surface (8) of the valve seat portion (7) is precisely finished as a sealing surface of the valve seat. The top surface (8) is trapezoidal and forms an acute angle to prevent the valve body (2) from adhering to the top surface due to oil. An annular groove (9) is formed on the cylindrical outer periphery of the sheet (1). The valve body (2) is formed by punching a thin metal plate into a circle with a press and removing burrs by barrel polishing.
Use a flat valve (10). The holder (3) is embossed, and in the illustrated embodiment, has four legs (11) with a circular upper surface (12).
Extend at a right angle from. The lower end of the foot (11) is bent outward to form a guide (13), and the guide (13) facilitates the incorporation of the valve body (2). Above the guide (13) provided on the foot (11), a projection (14) spherically embossed toward the inside of the foot (11) is provided so that the seat (1) is assembled when the seat (1) is assembled. The engaging portion engages with the groove (9) of 1).

Also, the inner diameter of the embossed inner surface (15) of the foot (11) is
It is set based on the outer diameter of the seat (1), and set slightly smaller than that. A hole (17) is formed in the center of the upper surface (12) of the holder (3), a trapezoid extending downward is formed inside the hole (17), and a pawl (18) acting as a stopper is formed in the embodiment shown in the figure. Is formed with four.

After each of these parts is manufactured separately, in the assembly process, the holder (3) is reversed and the valve body (2) is placed inside the foot (11) along the guide (13) of the holder (3). Insert, push down against the holding force of the protrusion (14), foot (11)
It is expanded against the elasticity of and inserted into the inner surface (15). The inner diameter of the holder (3) is determined based on the outer diameter of the seat (1), and the gap between the outer diameter of the valve body (2) and the inner surface (15) of the foot (11) of the holder (3) is uniform. It is managed.
Next, by pushing the seat (1) into the foot (11), the protrusion (14) is fitted into the groove (9) and fixed.

The check valve (4) assembled in this manner and formed into a cartridge as shown in FIG. 2 is obtained. Since the check valve (4) alone can be used for performance inspection by making it into a cartridge, the holder (3) can be removed and the valve body (2) can be replaced if there is a problem such as valve leakage. it can.
Further, in the assembled state, the sheet portion is less likely to be scratched, and the handling thereof becomes easy.

Furthermore, since the foot (11) is embossed, the valve body (2)
Does not come into contact with the burr formed on the edge of the foot (11), and the contact portion between the valve body (2) and the foot (11) is small and sliding resistance is reduced.

When this check valve is used in various devices, it is in the closed position in the solid line state in FIG. 2, and the flow from the direction of arrow A in the figure is stopped. On the other hand, with respect to the flow in the direction of the arrow B in the figure, the maximum open state is pushed up until it comes into contact with the claw (18) as shown by the chain line in the figure. In this state, as indicated by the chain line arrow in the figure, the fluid flows from the inside and outside of the claw (18) through the gap, and the valve is open.

FIG. 3 shows another embodiment of the check valve of the present invention. In the check valve (40), a large diameter cylindrical portion (42) is provided below the seat (41) and a groove (43) is provided on the outer circumference thereof. This check valve (40) is assembled into cartridges by assembling the respective parts as in the above-mentioned embodiment, and then inserted into the pipe (44), and is squeezed from the outer periphery of the pipe (44) according to the groove (43). 45) Form and fix. Alternatively, the groove (43) can be engaged with the throttle (45) by forming a small throttle in advance in the pipe (44) and pressing the check valve (40) there.

In this embodiment, with respect to the flow in the direction of arrow C in the figure, the valve body (46) is pushed up to open the valve, as in the previous embodiment. In the case of this embodiment, in addition to the flow paths in the above-described embodiments, flow paths are formed between the legs (47) of the holder and the inner surface of the pipe (44).

FIG. 4 shows an example in which the check valve according to the embodiment of FIG. 3 is used as an expansion valve (50). The bottom surface (52) of the seat (51) faces the valve (53) side, and A spring (54) is interposed between the two. In this case, the piping (55) throttle (5
Depending on the position of 6), the spring load of the spring (54) can be adjusted. Further, the check valve may be reversed and assembled in the direction shown in FIG. 3 so that the spring (54) is received by the upper surface of the holder, in which case the flow direction can be reversed. . In addition, when forming such a composite valve body, it can be inspected in advance by a single check valve and incorporated, so that it is effective in reducing product defects and reducing the steps in the assembly process. .

〔The invention's effect〕

Since the present invention is configured and operates as described above, the valve body is light in weight, the pressure loss is reduced, and the valve squeal is also eliminated. Moreover, since it is made of a metal plate without using a synthetic resin to reduce the weight of the valve body, it has high heat resistance and therefore can be installed close to a high heat source, and the piping can be shortened. In addition, the check valve can be made into a cartridge, which makes it compact, and because it can be inspected as a single product, the occurrence of defective products in the assembly is reduced, and it is easy to carry it as a cartridge, so a valve seat with a precision finish It is less likely that other parts will touch the part and damage it.

Furthermore, since the valve seat portion is formed in a trapezoidal shape on the acute-angled top surface and the stopper is formed in the shape of a claw hanging inward, the valve body made of a thin metal plate is lightweight, so when the refrigerant flow rate is small,
Even if the valve body adheres to the valve seat and the stopper due to oil, etc., the contact area between the valve seat and the valve seat and the stopper is small, so the valve body can be easily floated or dropped with a small force. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing a disassembled state of a check valve according to the present invention,
FIG. 2 is a sectional view of the assembled state, FIG. 3 is a sectional view showing a state in which another embodiment of the present invention is incorporated in a pipe, and FIG. 4 is a check valve of the embodiment shown in FIG. FIG. 3 is a partial cross-sectional view showing a state in which is installed in an expansion valve. 1: Seat, 2: Valve body 3: Holder, 4: Check valve 7: Valve seat, 8: Top surface 9: Groove, 10: Flat valve 11: Foot, 13: Guide 14: Projection, 15: Inner surface 18: Claw, 40: Check valve 41: Seat, 50: Expansion valve 51: Seat

Claims (3)

[Claims] 1. A metal seat having a groove on the outer periphery and a trapezoidal valve seat portion having an acute-angled top surface, a valve body formed by punching a thin metal plate into a circle, and a guide for the valve body. In addition, a plurality of legs provided with protrusions that engage with the groove of the sheet are provided, and a plurality of inwardly hanging claw-shaped stoppers are provided in the upper part, and a flow path is provided between the legs and the stoppers. A cartridge-type check valve having a formed holder. 2. The cartridge type check valve according to claim 1, wherein the plurality of legs guiding the valve body are embossed in the longitudinal direction toward the inner surface. 3. A cartridge type check valve according to claim 2, wherein the lower end of the embossed foot is provided with a guide bent outward.