JP2002168357A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce backlash of a valve element unit and prevent unpleasant water flowing sounds. SOLUTION: This check valve is provided with the valve element unit 14 having a metal housing 22 formed in a cup shape having a valve seat part 26 in a bottom part by press molding, a valve element 12 arranged in an outer side of the housing 22, and a shaft part 10 supported by a bearing part 38 so as to freely slide in an axial direction, and a coil spring 3 energizing the valve element 12 in a valve seat 26 direction. The bearing part 38 is formed by a bearing member 30 of a body separate from the housing 22, and it has a sufficient length in its axial direction. The bearing part 38 is made of resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substantially cup-shaped metal housing having a valve seat at the bottom by press molding, a valve body disposed outside the housing, and a housing inside the housing. The invention relates to a check valve comprising: a valve body unit having a shaft portion slidably supported in an axial direction on a bearing portion of the valve body; and biasing means for biasing the valve body toward the valve seat portion. .

[0002]

2. Description of the Related Art A water check valve such as a hot and cold water mixing tap is sometimes provided with a check valve, and a check valve as shown in FIG. 2 is available. The check valve 60 will be described below. The check valve 60 is used by being mounted in the connecting portion 2 which is a connecting portion with the socket side connected to the water supply pipe, which is protruded from the faucet main body 1 and is provided with a male screw. It is what is being done.

The check valve 60 includes a housing 62 which is a metal press-molded product, and a bearing portion 64 of the housing 62.
And a valve body unit 14 urged by a coil spring 3 in a direction in which the valve body 12 is pressed against a valve seat 66 of the housing 62. The valve unit 14 includes a rubber valve 12 supported by upper and lower washers 16, and a shaft 10 extending coaxially with the central axis of the washer 16 and the valve 12. The outer peripheral edge of the valve body 12 forms a crimped portion 18 that is raised so as to be securely crimped to a valve seat 66 of a housing 62 described later. Also, near the tip of the shaft portion 10,
The stopper 20 that supports the coil spring 3 interposed between the housing 62 and the bearing portion 64 is attached.

On the other hand, the housing 62 is formed in a substantially cup shape, and a flange 68 is formed at an open end thereof.
A valve seat portion 66 corresponding to the crimping portion 18 of the valve body 12 over the entire periphery and capable of crimping the crimping portion 18 over the entire periphery is provided near the outer peripheral edge of the bottom of the housing 62. A plurality of beams 70 are provided on the bottom at equal angular intervals from the side of the housing 62 toward the axis thereof.
And between each beam part 70, the passage port 72 through which the fluid can pass
Are drilled. At the center of the bottom of the housing 62 where the beam portion 70 is continuously provided, a substantially cylindrical shape provided with an insertion hole 67 which is raised toward the opening direction of the housing 62 and through which the shaft portion 10 of the valve unit 14 is inserted. Bearing 6 of shape
4 are provided. One end of the coil spring 3 is mounted on the outer periphery of the bearing portion 64 of the housing 62, and the other end of the coil spring 3 is supported by the stopper 20 mounted near the tip of the shaft portion 10 of the valve unit 14. 3 urges the stopper 20 against the beam portion 70 of the housing 62 in the direction away from the beam portion 70 to urge the entire valve body unit 14 upward, thereby causing the crimping portion 18 of the valve body 12 to Seat 6
6 so as to be pressed.

When the fluid flows from the inlet A to the outlet B (from above to below in the figure),
The entire valve body unit 14 moves toward the outlet B side against the urging force of the coil spring 3 due to the pressure of the fluid, and
When the valve 8 is separated from the valve seat 66, the flow path is opened and the fluid flows to the outlet B through the passage 72. On the other hand, when the fluid flows from the outlet B toward the inlet A (from the lower side to the upper side in the figure), the entire valve body unit 14 is moved by the urging force of the coil spring 3 and the pressure of the fluid. The pressure is applied to the side, and the crimping portion 18 of the valve body 12 is crimped to the valve seat 66 to close the flow path and prevent the fluid from flowing backward.

[0006]

However, the above-mentioned conventional check valve 60 has the following problems. Since the bearing portion 64 is integrally formed from the metal housing 62 which is a press-molded product, a sufficient length in the axial direction cannot be secured. That is, since press molding is a bending process, only a length of about the radius of the hole can be secured. Accordingly, there is a problem in that the rattling is large when the shaft portion 10 slides, and an unpleasant running sound is generated from the check valve 60 when water is passed. Further, since both the shaft portion 10 and the bearing portion 64 into which the shaft portion 10 is inserted are made of metal, there is also a problem that the contact noise of these members becomes extremely large.

Further, when a check valve is mounted on a part where various devices are installed, such as a center part of a faucet component such as a faucet main body and a socket, some flow from the check valve to the outside is performed. Due to the presence of roads and bulkheads and other devices,
Although the above flowing sound and contact sound may be mitigated, when a check valve is attached to a portion that is protruded and connected to another faucet component, it is difficult to mitigate the flowing water sound and contact sound. A loud noise is emitted to the outside of the faucet part.

The present invention has been made to solve the above-mentioned problems of the conventional check valve, and its object is to reduce rattling of the valve body unit and prevent unpleasant running noise of the check valve. It is in. In particular, it is another object of the present invention to reduce the contact noise between the shaft and the bearing.

[0009]

Means for Solving the Problems Means taken by each of the present invention to solve the above problems will be described below. The check valve according to claim 1 of the present invention includes a metal housing formed into a substantially cup shape having a valve seat at a bottom portion by press molding, and a valve element disposed outside the housing. A valve body unit having a shaft portion slidably supported in the axial direction by a bearing portion in the housing; and a biasing means for biasing the valve body in the valve seat direction. A non-return valve, wherein the bearing portion is formed by a bearing member separate from the housing.

[0010] By forming the bearing portion by a bearing member separate from the housing, the length of the bearing portion can be freely set, and a sufficient length can be secured. Then, if the length of the bearing portion is sufficiently ensured, the shaft portion of the valve unit can be slid with less rattling, thereby suppressing generation of unpleasant running noise.

The check valve according to a second aspect of the present invention is “the check valve according to the first aspect, wherein at least one of the bearing portion and the shaft portion is made of resin”. .

When both the bearing portion and the shaft portion are made of metal,
These contact sounds tend to be loud. Therefore, by making at least one of these members made of resin, the contact sound can be suppressed as compared with the contact sound between metal members. It is preferable that both the bearing portion and the shaft portion are made of resin. Further, in the present invention, not only the entire bearing portion, the entire bearing member forming the bearing portion, or the entire shaft portion is made of resin, but the sliding surface may be made of resin.

According to a third aspect of the present invention, there is provided a check valve, wherein the bearing member includes a cylindrical guide portion fitted in a housing, a beam portion supporting the bearing portion in the guide portion, The check valve according to claim 1, wherein the check valve comprises:

When the cylindrical "guide" is fitted and the bearing member is mounted on the housing, the bearing member can be stably mounted in the housing. Therefore, the backlash of the whole bearing member with respect to the housing can be reduced, and the backlash of the valve body unit during the passage of water can be reliably reduced. The “guide portion” may be any cylindrical shape that is fitted into the housing, and does not limit the shape or clearance to the housing. For example, the “guide portion” is press-fitted into a cylindrical housing. It is preferable to use a cylindrical member or the like that can be fixed more stably.

The check valve according to a fourth aspect of the present invention is characterized in that the check valve is mounted on a connection portion protruding from a faucet component such as a faucet body. The check valve according to the above.

The check valve according to any one of the first to third aspects is capable of suppressing the noise of flowing water. Therefore, as in the present invention, the check valve is protruded as a connection portion with another faucet part. It is preferable that the device be attached to a portion where the sound is transmitted to the outside, that is, a portion where sound is easily transmitted to the outside, since a more remarkable effect can be obtained. The “faucet parts” refer to various parts relating to the faucet, such as a faucet body, a socket, and a joint, into which the check valve is incorporated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a check valve to which each of the inventions of the present invention is applied will be described in detail with reference to FIG. The present invention is not limited to the following embodiments, and various modifications can be made within the scope of the present invention. As shown in FIG.
The check valve 4 is used by being mounted in a connecting portion 2 which is a connecting portion with a socket side connected to a water supply pipe, which is protruded from a faucet main body 1 and is provided with a male screw. It is.

The check valve 4 is provided with a housing 22 made of metal such as stainless steel. The housing 22 is formed in a substantially cup shape, and a flange 24 is formed at an open end thereof. A valve seat 26 to which the crimping portion 18 of the valve body 12 is crimped is provided on the outer peripheral edge of the bottom of the housing 22.
Is provided. A passage port 28 through which fluid can pass is bored inside the valve seat 26.

Inside the housing 22, a bearing member 30 entirely made of resin is housed and held. Bearing member 3
0 is particularly preferably a synthetic resin having excellent so-called “self-lubricating properties” such as a fluorinated resin such as PTFE resin and a POM resin, and by adopting such a synthetic resin material, The friction between the shaft 10
But can be moved up and down smoothly.

The outer periphery of the bearing member 30 is
It is provided with a cylindrical guide portion 32 which is provided with an outer diameter substantially equal to the inner diameter and is press-fitted into the housing 22 and fixed. Then, from the inner wall surface of the guide portion 32, the plurality of beam portions 34 are arranged at equal angular intervals toward the axis of the bearing member 30.
Are provided, and between each beam portion 34, a passage port 36 through which a fluid can pass is formed.

A substantially cylindrical bearing 38 supported by the beam 34 is provided at the center of the bearing 30. The inner peripheral surface of the bearing 38 is
Are slidably inserted in the axial direction. Further, a small-diameter portion 42 to which the coil spring 3 is attached is formed outside the front end of the bearing portion 38. This coil spring 3 is the "biasing means" according to claim 1.
This is an example. Here, the length of the bearing portion 38 is
The length of the bearing 38 is equal to or greater than the diameter of the shaft 10, preferably the diameter of the shaft 10. When the length is at least twice as large as the above, the shaft portion 10 can be slid more stably.

The check valve 4 has a bearing 38
Is provided with a valve body unit 14 in which the shaft portion 10 is slidably inserted up and down. The valve body unit 14 includes a rubber valve body 12 supported by upper and lower washers 16 and the washer 1.
6 and a shaft 1 extending coaxially with the central axis of the valve body 12
0 is provided. The valve element 12 is provided outside the housing 22 of the flow path (the lower side in the figure). Further, the outer peripheral edge of the valve body 12 has a crimped portion 18 raised so as to be securely crimped to the valve seat portion 26 of the housing 22.
Is formed. The washer 16 and the valve body 12 are held by a flange 15 from the center of the valve shaft 10 and a nut 17 screwed from the base end side of the valve shaft 10, and are fixed to the valve shaft 10.

A stopper 20 for supporting the coil spring 3 interposed between the shaft portion 10 of the valve body unit 14 and the bearing 38 is attached to the valve unit 14. The coil spring 3 urges the entire valve element unit 14 in the socket side direction (upward in the drawing), and the crimping portion 1 of the valve element 12 that is a part of the valve element unit 14.
8 is crimped to the valve seat 26 of the housing 22.
Even when the bearing member 30 is loosely fitted to the housing 22, the bearing member 30 is urged into the housing 22 by the coil spring 3 and is stably housed and held.

The check valve 4 configured as described above has a connection portion projecting from the faucet main body 1 with its opening side, that is, the flange portion 24 side of the housing 22 facing the primary side of the flow path, that is, the socket side. 2 is mounted inside. Specifically, the connection unit 2
Of the joint 5 screwed to the socket side, and a flange 24 is fixedly held therebetween. The packing 7 is interposed between the flange 24 of the housing 22 and the flange 6 of the joint 5 to achieve watertightness. Then, a nut 44 is screwed to the connection portion 2 from the proximal end side of the joint 5, and the flange 6 of the joint 5, the packing 7, and the flange 24 of the housing 22 are provided.
Is fixedly held between the nut 44 and the opening end of the connection portion 2. By fixing the flange portion 24 in this manner, the entire check valve 4 is fixed in the connection portion 2.

An O-ring 8 is interposed between the outer peripheral surface of the housing 22 and the inner peripheral surface of the connecting portion 2 of the faucet main body 1 to achieve watertightness. Further, in order to position the O-ring 8 at a position away from the flange 24, the O-ring 8 and the flange 2 between the outer peripheral surface of the housing 22 and the inner peripheral surface of the connection portion 2 are arranged.
Between them, a split ring 9 is interposed. Also,
A protrusion 23 is provided around the outer peripheral surface of the housing 22. The protrusion 23 serves to position the O-ring 8 and the split ring 9 and prevent the O-ring 8 and the split ring 9 from falling off.

In the check valve 4 described above, when the fluid is going to flow from the outlet B to the inlet A (from the bottom to the top in the figure) as shown in FIG. ,
The entire valve body unit 14 is urged toward the inflow port A by the urging force of the coil spring 3 and the pressure of the fluid, and the crimping portion 18 of the valve body 12 is crimped to the valve seat 26 to close the flow path.

On the other hand, when the fluid is going to flow from the inflow port A to the outflow port B (from the upper side to the lower side in the figure), the pressure of the fluid opposes the urging force of the coil spring 3. The entire valve body unit 14 moves to the outlet B side, and the flow path is opened by the press-fit portion 18 being separated from the valve seat 26, and the fluid flows to the outlet B through the passage ports 28 and 36.

At this time, since the length of the bearing portion 38 in the axial direction is sufficiently long, the rattling of the shaft portion 10, that is, the rattling of the entire valve body unit 14, can be suppressed. . In addition, the bearing member 30 constituting the bearing portion 38 is such that the guide portion 32 is
Therefore, the rattling of the bearing member 30 itself can be suppressed, and the rattling of the valve body unit 14 can be further reduced. Further, when the shaft portion 10 comes into contact with the insertion hole 40 of the bearing portion 38, since the bearing portion 38 is made of resin, the contact noise can be suppressed even in the case of contact with the metal shaft portion 10. Can be.

Further, since the valve element 12 of the valve element unit 14 is disposed outside the valve seat 26 of the housing 22 and the shaft 10 is inserted into the housing 22, the valve element is disposed in the housing. The shape of the substantially cup-shaped housing 22 in the axial direction is shorter than that of the check valve in which the check valve is provided or the shaft portion is disposed outside the housing, thereby making the entire check valve 4 compact. Can be. Therefore, it is possible to provide a check valve that can be mounted on a portion where the arrangement space is restricted, such as in the connection portion 2 slightly projecting from the faucet component.

[0030]

Since each of the present inventions is configured as described above, it is possible to reduce rattling of the valve body unit and prevent unpleasant running noise of the check valve. In particular, according to the second aspect of the invention, it is possible to reduce the contact noise between the shaft portion and the bearing portion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a check valve and a connection portion to which the check valve is attached.

FIG. 2 is a sectional view of a conventional check valve.

[Explanation of symbols]

1; faucet body, 2; connection, 3; coil spring,
4; check valve, 5; coupling, 6; flange, 7; packing, 8;
O-ring, 9; split ring, 10; shaft, 12; valve body,
14; valve body unit; 15; flange; 16; washer; 17;
Nut, 18; Crimping part, 20; Stopper, 22; Housing, 23; Projection, 24; Flange, 26; Valve seat, 28;
Passing port, 30; bearing member, 32; guide section, 34; beam section, 36; passing port, 38; bearing section, 40;
2; small diameter portion, 44; nut, 60; check valve, 62; housing, 64; bearing portion, 66; valve seat portion, 67; insertion hole, 68; flange portion, 70; beam portion, 72; A: Inlet, B: Outlet.

Claims (4)

[Claims] 1. A metal housing formed into a substantially cup shape having a valve seat at the bottom by press molding, a valve body disposed outside the housing, and a shaft center in a bearing in the housing. A valve body unit having a shaft portion slidably supported in a direction, and a biasing unit for biasing the valve body in the direction of the valve seat portion, the check valve comprising: Is formed by a bearing member separate from the housing. 2. The check valve according to claim 1, wherein at least one of the bearing portion and the shaft portion is made of resin. 3. The bearing member according to claim 1, wherein the bearing member includes a cylindrical guide portion fitted into a housing, and a beam portion supporting the bearing portion in the guide portion. 3. The check valve according to 2. 4. The check valve according to claim 1, wherein the check valve is mounted on a connecting portion protruding from a faucet component such as a faucet body.