JPS6015980Y2 - non-return valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a check valve used in a flow path of a refrigeration cycle.

Conventionally, this type of check valve has a structure in which cut parts are used for the main body or valve disc, but this is expensive, and the pipe body itself has to be modified to provide a valve seat and a stopper for the valve disc. In the simple type, there is a high risk of deformation when joining with a mating pipe such as in a refrigeration cycle, and as a noise countermeasure, synthetic resin is used for the valve body, and the valve body slides directly on the inner wall of the pipe. In the type of
This has the disadvantage that the pipe itself must be made longer to cope with the heat of welding with the mating pipe, leading to increased costs.

Therefore, a reversing valve with a similar structure as shown in Fig. 4 was developed.

In this structure, a spherical valve body 1 is inserted and held in a valve body housing 3 having a valve body stop part 2. This valve body housing 3 is attached to a valve body 5 having a valve seat part 4, and a valve mechanism part 6 is attached to the valve body 5. The valve mechanism section 6 is press-fitted into the tube body 7, and a part of the tube body 7 is caulked to fix the valve mechanism section 6.

However, the installation of this check valve is limited within a certain angle at which the spherical valve body 1 falls onto the valve seat 4 due to its own weight.

The reason for this is that the check valve is installed horizontally or so that the valve seat part 4 is located above the valve body stop part 2, so that the forward flow from right to left in FIG. When the flow is switched from left to right in FIG. 4, the structure of this check valve causes the fluid to hit the valve stop part 2 of the valve body 3 and cause turbulence, and the spherical valve body 1 Since there is less of the part exposed to the fluid than the valve stop part 2, the fluid flows to surround the spherical valve element 1 before pressing the spherical valve element 1 against the valve seat part 4, and a part of the fluid flows around the spherical valve element 1. The fluid flows inside the valve body 3 and causes turbulence and hits the periphery of the valve seat 4. Due to the reaction, a part of the fluid flows into the valve body 5 while blocking the back pressure operation of the spherical valve body 1, thereby preventing the check valve from functioning properly. This is due to the fact that it may not work and its operation is uncertain.

The present invention was developed in view of these points, and involves inserting a spherical valve body into a valve body housing having a valve body stop portion provided with a flow path for backpressure operation, and then inserting this valve body housing. engages the valve body;
By press-fitting this valve body into the pipe body and caulking a part, the valve body is fixed and at the same time the valve body accommodating body is fixed, and the spherical valve body L is surely operated with back pressure, and the installation direction and angle are correct. It provides a free check valve.

Next, one embodiment of the present invention will be described based on FIGS. 1 to 3.

Reference numeral 1 denotes a spherical valve body made of stainless steel, synthetic resin, etc., which is movably inserted into an elastic valve body housing 3 made of metal, synthetic resin, etc. The valve body 5 has a valve seat portion 4 that can be moved into and out of the valve body 5. The valve body 5 is removably press-fitted onto the valve seat portion 4 side of the valve body 5 to form a valve mechanism portion 6.

The valve body accommodating body 3 has a substantially U-shape consisting of a valve body stopping portion 2 and a pair of elastic holding portions 8, 8, and its inner diameter is slightly larger than the diameter of the valve body 1, and the valve body 1 is not easily operated. The inner diameter is suitable for operation so that it can be held movably only in one direction.

Further, a fluid outflow portion 9 is formed between each side edge of the pair of holding portions 8, 8 of the valve body accommodating body 3, and each of the holding portions 8
A fixing part 8a having a large diameter is integrally bent at the tip of each fixing part 8a, and a retaining pawl 10 is integrally bent inward at the tip of each fixing part 8a.

The pair of holding parts 8 have spring properties that act inwardly toward each other, that is, in the closing direction, and this spring property serves to hold the spherical valve body 1 in the valve body housing 3 itself when assembled. , facilitating automatic assembly.

Further, a circular hole-shaped passage 11 is formed in the center of the valve body stop portion 2 to ensure back pressure operation of the spherical valve body 1.

Further, the valve body 5 is a molded or cut part, and has an inflow hole 12 passing through the center thereof, the valve seat portion 4 is formed at one end, and the valve body accommodating body is formed on the outer peripheral surface of the valve seat portion 4. A retaining groove 13 with which the pawl 10 at the tip of the retainer 8 is engaged is formed in an annular shape.
The outer diameter is made smaller by the thickness of the outer diameter.

Further, an annular groove 14 for fixing the valve body 5 to the copper pipe body 7 is formed in the outer circumferential surface of the larger diameter side of the valve body 5.

Further, the valve seat portion 4 of the inflow hole 12 is finished with coining, and the other side is chamfered.

Note that the coining finish surface is close to the surface and has a structure that facilitates coining processing.

Further, the valve body 5 and the valve body housing 3 can be freely attached and detached due to the elasticity of the holding portion 8, and the claw 10 and the engagement groove 13
The structure is such that it is prevented from coming off by engagement with the tube body 7, and that an operation test can be performed before assembling it into the tube body 7, and that defective parts can be replaced or removed.

Then, the spherical valve body 1, the valve body accommodating body 3, and the valve body 5
The valve mechanism part 6 consisting of the above is press-fitted into the middle part of the pipe body 7,
A part of this pipe body 7 is caulked inward in an annular manner by constriction until airtightness is maintained against the fixing groove 14 of the valve body 5, and the valve body 5 is fixed by the caulking portion 15, and at the same time The fixing portion 8a of the valve body housing 3 is also held between the inner wall of the tube body 7 and a part of the valve body 5, and the retaining claw 10 is held in the engagement groove 13, thereby fixing it to the tube body 7. .

In addition, pipe stops 1 are provided at both ends of the pipe body 7 to connect the mating pipe.
6 is provided at any position.

Note that the inner wall of the tube body 7 and the valve body accommodating body 3 are separated by a certain hollow part, and the structure is such that the welding heat during attachment to the mating tube does not directly reach the spherical valve body 1. This makes it possible to shorten the time and make it more compact.

Next, the operation of this embodiment will be explained.

In FIG. 1, for a forward flow from right to left, the spherical valve body 1 is pushed into the valve body stop part 2 of the valve body 3 by the pressure of the fluid that has flowed into the inflow hole 12 of the valve body 5. At this point, the fluid flows from the outflow portion 9 of the valve body accommodating body 3 to the other side through the gap between the valve body accommodating body 3 and the pipe body 7.

Next, the flow in the opposite direction, that is, the flow from left to right in FIG. 1, will be explained.

A portion of the fluid that has entered the pipe body 7 passes through a flow path 11 provided in the valve body stop portion 2 for operating back pressure and pushes the spherical valve body 1 .

Therefore, the turbulence of the fluid near the valve body accommodating body 3 is reduced, and the spherical valve body 1 comes into contact with the valve seat 4 and stops the flow.

In this case, even if this check valve is installed horizontally or with the valve body stop part 2 located below the valve seat part 4, the fluid directly presses the spherical valve body 1, and the spherical valve body 1 5 and stops the fluid.

In the embodiment described above, the flow path 11 for operating the back pressure was formed in a protruding circular hole shape, but the shape is not limited to this, and it may be formed into a cut or other shape.

In addition, since the valve body 1 is held by each holding portion 8 of the valve body accommodating body 3 so as to be movable only in the direction of operation thereof, less noise is generated and the operation is reliable.

Further, in the above embodiment, when the valve body housing 3 and the spherical valve body 1 are made of metal or synthetic resin, the characteristics
Combinations can be made depending on the mounting location, etc., and operational noise caused by metals can be prevented.

According to the present invention, the spherical valve body is accommodated in the valve body housing, and the retaining pawl of the valve body is engaged with the engagement groove of the valve body, so that the valve seat portion of the valve body is on the surface. The coining process is easy, and since a mechanical part consisting of three parts, the spherical valve body, the valve body and the valve body, can be assembled before being attached to the pipe body, it is possible to test the operation during assembly. Defective parts can be extracted and replaced, allowing early detection of defects.

Further, if the valve body housing and the spherical valve body are each made of metal or synthetic resin, they can be combined depending on the characteristics, mounting location, etc., and operational noise caused by metals can be prevented.

In addition, since the valve body is held between the holding parts of the valve body housing so that it can move freely only in the direction of operation, it is possible to prevent noise between the valve body and the valve body housing, and to ensure reliable operation. Since the valve body is isolated by a certain hollow space, the welding heat between the tube body and its mating tube does not directly reach the spherical valve body, making it possible to shorten the tube body and make it more compact.

Furthermore, when the valve body with the valve body housing attached thereto is press-fitted into the pipe body, the fixed part of the valve body housing is held between the pipe body and the valve body, and the retaining claw is held in the engagement groove, thereby causing the valve body to be held in the engagement groove. Since the body accommodating body is fixed, the pipe body can be caulked only at one location relative to the fixing groove of the valve body, and the number of assembly steps can be reduced.

In addition, the valve body housing can be made by press forming or mold processing, and the spherical valve body can be mass-produced using synthetic resin, steel balls, etc., so cutting processes can be reduced, and overall assembly man-hours are low and automatic assembly is possible. It is easy and can reduce parts costs.

By providing a flow path for operating the back pressure of the spherical valve body in the valve body stopping part of the valve body, fluid turbulence near the valve body is reduced, and the back pressure of the spherical valve body is reduced. Pressure operation is reliably performed, and the installation direction and angle of the check valve are not restricted, allowing it to be installed in any direction or angle with respect to the flow path of the refrigeration cycle, making the refrigeration cycle more compact and reducing costs. be able to.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the check valve of the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a partially cutaway side view of the valve body housing. FIG. 4 is a sectional view of the main parts of the check valve, which is the premise of the present invention. 1... Spherical valve body, 2... Valve body stop part,
3... Valve body housing body, 4... Valve seat portion, 5
... Valve body, 7 ... Pipe body, 8 ...
...Holding part, 8a...Fixing part, 10...
- Removal prevention claw, 11... Channel, 13...
・Engagement groove, 14...Fixing groove, 15...
・Caulking part.

Claims (1)

[Scope of Claim for Utility Model Registration] A spherical valve body, and a valve body stop part provided with a flow path for operating back pressure on the spherical valve body, which is held between both sides of the valve body so that the spherical valve body can move freely only in the operating direction. A pair of holding parts are bent, and a large-diameter fixing part is bent at the tip of each holding part, and a retaining claw is inserted inward at the tip of each fixing part. It has a bent valve body housing body, a valve seat portion for the spherical valve body, a fixing groove is formed on the outer circumferential surface, and the retaining claw is provided on the outer circumferential surface of the fixing groove on the valve seat side. By press-fitting the valve body, the fixing portion of the valve body housing is sandwiched between the valve body and the valve body, which is formed with an engagement groove for engaging the valve body, and the valve body is inserted into the engagement groove of the valve body. A check valve comprising: a pipe body that holds a retaining pawl of a housing body and fixes the valve body by caulking a part of the retaining pawl into a fixing groove of the valve body.