JP2012097871A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve dispensing with maintenance for periodically removing dust such as iron powder adhered to meshes of a strainer without capturing dust such as iron powder between a valve seat and a valve element.SOLUTION: In the valve comprising the valve seat 31 arranged in a valve body 3 for controlling a flow of fluid from a valve flow inlet 1 side to a valve flow outlet 2 side and the valve element 41 connected to a driving member 4 facing the valve seat 31, an opening/closing strainer 5 is arranged on the valve flow inlet 1 side.

Description

The present invention relates to a valve.
Moreover, this invention relates to the valve | bulb used suitably for the pressure reducing valve of water supply piping, such as an electric water heater, for example.

Conventionally, a valve as shown in Patent Document 1 is known.
That is, this type of valve has the configuration shown in FIGS.
This type of valve includes a valve body 300 and a valve drive member 400. The valve body 300 has a valve inlet 100 on the upstream side, a valve outlet 200 on the downstream side, and these valve inlets. A cylinder portion 600 formed between the valve inlet 100 and a valve hole 320 communicating with the valve inlet 100 and the valve outlet 200 at a position opposed to the cylinder portion 600. A valve seat 310 formed at the opening end of the hole 320 is formed.

  The drive member 400 includes a valve rod 420 disposed so as to penetrate the cylinder portion 600 and the valve hole 320 of the valve main body 300, and is formed integrally with the valve rod 420 via a packing 610 on the inner peripheral surface of the cylinder portion 600. A piston 430 that is slidably fitted so as to be slidable, a valve body 410 that is coupled to an end of the valve rod 420 and opens and closes the valve hole 320 from the valve outlet 200 side, and a valve rod 420 on the opposite side of the valve body 410. A diaphragm 440 that is coupled to the end (the end of the piston 430) and urges the valve body 410 toward the valve seat 310 by the water pressure of the valve outlet 200, and the valve body 410 to the valve seat 310. The spring 450 is urged in a direction away from the spring 450.

  When the water pressure on the valve outlet 200 side increases due to some factor, the valve for the pressure reducing valve is displaced in a direction in which the diaphragm 440 receiving the water pressure compresses the spring 450, and the valve coupled to the diaphragm 440 Since the valve body 410 is displaced in the valve closing direction via the rod 420, the flow passage area from the valve hole 320 to the valve outlet 200 side is reduced, the pressure loss is increased, and the water pressure at the valve outlet 200 is set to a predetermined value. The following is maintained.

  Further, the hydraulic pressure on the valve inlet 100 side in a state where the valve body 410 abuts against the valve seat 310 by the driving member 400 and the valve hole 320 is blocked by blocking the valve inlet 100 and the valve outlet 200. Since the valve inlet 100 and the valve outlet 200 are communicated with each other by this water pressure, the water pressure at the valve inlet 100 can be released to reduce the pressure. (Patent Document 1)

When this type of valve is in the closed state shown in FIG. 7 and dust such as iron powder flows into the valve, it is trapped between the valve seat 310 and the valve body 410 and the valve body 410 is damaged. The problem that the blockage between the valve seat 310 and the valve body 410 becomes insufficient was caused.
As a countermeasure, a strainer is installed on the upstream side of the valve to prevent dust such as iron powder from flowing into the valve. However, dust such as iron powder adhering to the mesh of the strainer is periodically removed. Maintenance to do was necessary.

  As a countermeasure, a valve having a double annular projection provided between the valve seat and the valve body has been proposed, but it is not sufficient as a countermeasure against dust such as iron powder. (Patent Document 2)

JP 2008-186106 A JP 2010-186353 A

  The present invention has been made in view of the above-described problems, and dust such as iron powder is not trapped between the valve seat and the valve body, and dust such as iron powder attached to the mesh of the strainer. It is an object to provide a valve that does not require maintenance for periodically removing water.

  The valve of the present invention includes a valve seat and a valve outlet, and a valve seat disposed in the valve body for controlling a flow of fluid from the valve inlet side to the valve outlet side; In a valve comprising a valve body connected to a drive member facing the valve seat, an open / close strainer is disposed on the valve inlet side.

The present invention has the following effects.
According to the valve of the first aspect of the present invention, dust such as iron powder is not trapped between the valve seat and the valve body, and dust such as iron powder adhering to the mesh of the strainer is periodically removed. Maintenance is not required.
According to the valve of the second aspect of the present invention, dust such as iron powder is not trapped between the valve seat and the valve body with a simple structure, and the dust such as iron powder adhered to the mesh of the strainer. Maintenance is not required to remove the water periodically.

According to the valve of the third aspect of the present invention, since the area of the filter part through which the fluid passes through the strainer can be increased, the flow resistance of the fluid can be reduced and the dust such as iron powder attached to the filter part can be easily removed. It becomes.
According to the valve of the invention described in claim 4, by using the filter portion and the holding portion as a resin material, melting and integration can be easily performed and dust such as iron powder attached to the filter portion can be easily removed. .

  According to the valve of the invention of claim 5, it is suitably used for a pressure reducing valve.

Sectional drawing of the valve | bulb which concerns on this invention. 1 is an enlarged cross-sectional view of the open / close strainer used is closed. 1 is a side view of the open / close strainer used. 1 is an enlarged cross-sectional view of the open / close strainer used is open. The figure which showed the 2nd aspect of the opening-and-closing strainer which concerns on this invention similarly to FIG. Sectional drawing of the valve | bulb which concerns on a prior art. FIG. 7 is a partially enlarged view of the valve of FIG. 6 in a closed state.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 4, the valve according to the present invention includes a valve inlet 1 and a valve outlet 2, and controls the flow of fluid from the valve inlet 1 side to the valve outlet 2 side. A valve seat 31 disposed in the main body 3 and a valve body 41 connected to the driving member 4 facing the valve seat 31 are configured.
An opening / closing strainer 5 is disposed on the valve inlet 1 side.

  The open / close strainer 5 includes a guide portion 51 held in the valve body 3 on the valve inlet 1 side, a strainer mesh portion 52 held in the guide portion 51 so as to be able to reciprocate, and the strainer mesh portion 52 elastically. It is comprised from the strainer spring 53 currently supported.

The strainer mesh portion 52 is a rod-like filter that is reciprocally movable in a mesh-shaped filter portion 521 that captures dust such as iron powder but allows the passage of fluid, and a cylindrical portion 511 provided in the guide portion 51. And a holding part 524 holding the filter part 521 at one end of the rod-like part 523.
The filter unit 521 held by the holding unit 524 is disposed so as to close the opening 512 provided in the guide unit 51.

Therefore, as shown in FIG. 2, when the flow rate of the fluid flowing through the valve inlet 1 is small, most of the fluid flows through the filter portion 521 of the strainer mesh portion 52.
Next, when the flow rate of the fluid flowing in the valve inlet 1 increases to a certain amount or more, as shown in FIG. 4, the strainer spring is caused by the flow resistance when the fluid passes through the filter portion 521 of the strainer mesh portion 52. 53, the entire strainer mesh portion 52 is moved to the valve outlet 2 side (the right side in the figure), and most of the fluid flows through other than the strainer mesh portion 52.

By providing such an open / close strainer 5 that opens and closes by the fluid pressure (flow rate change) generated on the valve inlet 1 side of the valve, the open / close strainer 5 is used as a guide when the flow rate of the fluid is small (the differential pressure is small). Since the opening 512 provided in the part 51 is closed, the input fluid passes through the sfilter part 521 and is removed from the dust such as iron powder as the fluid between the valve seat 31 and the valve body 41. Go through the narrow stroke area.
Therefore, it becomes possible to suppress the closing failure due to the dust biting of the valve as compared with the conventional case.

Further, when the flow rate of the fluid is large (the differential pressure is large), as shown in FIG. 4, the open / close strainer 5 is in an open state and flows out without pressure loss.
In this case, even if the fluid does not pass through the strainer mesh portion 52 and contains dust, the flow rate is large, so the stroke of the valve is large, and the wide stroke portion between the valve seat 31 and the valve body 41 of the valve passes through. , Discharged to the valve outlet 2 side.
For this reason, it does not bite between the valve seat 31 and the valve body 41 of the valve.

  Furthermore, when the flow rate of the fluid is large (the differential pressure is large), the fluid containing dust is discharged to the valve outlet 2 side, so that maintenance for removing the dust on the strainer mesh portion 52 of the open / close strainer 5 is not required. Become.

  The drive member 4 includes a valve rod 42 arranged so as to penetrate the cylinder portion 6 and the valve hole 32 of the valve body 3, and a packing 61 formed integrally with the valve rod 42 on the inner peripheral surface of the cylinder portion 6. A piston 43 slidably fitted through the valve rod 42, a valve body 41 coupled to the end of the valve rod 42 to open and close the valve hole 32 from the valve outlet 2 side, and the valve rod 42 opposite to the valve body 41 A diaphragm 44 that is coupled to an end portion (end portion of the piston 43) and urges the valve body 41 in the direction of approaching the valve seat 31 by the water pressure of the valve outlet 2, and the valve body 41 to the valve seat The spring 45 is urged in a direction away from the spring 31.

  When the water pressure on the valve outlet 2 side is increased for some reason, the valve for the pressure reducing valve is displaced in a direction in which the diaphragm 44 receiving the water pressure compresses the spring 45, and the valve coupled to the diaphragm 44 Since the valve element 41 is displaced in the valve closing direction via the rod 42, the flow passage area from the valve hole 32 to the valve outlet 2 side is reduced, the pressure loss is increased, and the water pressure at the valve outlet 2 is set to a predetermined value. The following is maintained.

  Further, the hydraulic pressure on the valve inlet 1 side is closed in a state in which the valve body 41 is in contact with the valve seat 31 by the driving member 4 and the valve hole 32 is closed to shut off the valve inlet 1 and the valve outlet 2. Since the valve inlet 1 and the valve outlet 2 are communicated with each other by this water pressure, the water pressure at the valve inlet 1 can be released to reduce the pressure.

Next, a second mode of the open / close strainer according to the present invention will be described with reference to FIG.
The difference from the embodiment shown in FIG. 2 is that the filter portion 521 has a conical shape protruding toward the valve inlet 1 side.
The shape of the filter portion 521 may be a truncated cone shape, and may be a structure having a conical portion.
As a result, the area of the filter portion through which the fluid passes through the strainer can be increased compared to a flat plate shape of the filter portion 521, so that the flow resistance of the fluid is lowered and the iron powder or the like attached to the filter portion is reduced. Since dust easily moves to the valve outlet 2 side along the conical surface, it is easy to remove dust such as iron powder adhering to the filter portion.

As the material of the filter portion 521, various types of mesh structures can be used, but a mesh structure made of a resin material is particularly preferable.
That is, by adopting a mesh structure made of a resin material, melting and integration with the holding portion 524 can be easily performed, and dust such as iron powder attached to the filter portion 521 can be easily removed.

  The valve | bulb which concerns on this invention can be used for the pressure reducing valve of water supply piping, such as an electric water heater, for example.

DESCRIPTION OF SYMBOLS 1 Valve inflow port 2 Valve outflow port 3 Valve body 4 Driving member 5 Opening and closing strainer 6 Cylinder part 51 Guide part 52 Strainer mesh part 53 Strainer spring 511 Cylindrical part 512 opening part 521 Filter part 523 Rod-like part 524 holding part

Claims (5)

  A valve inlet (1) and a valve outlet (2), in order to control the flow of fluid from the valve inlet (1) side to the valve outlet (2) side in the valve body (3) In the valve composed of the valve seat (31) and the valve body (41) connected to the drive member (4) facing the valve seat (31), the valve is opened and closed on the valve inlet (1) side. A valve characterized by arranging a strainer (5).   The open / close strainer (5) includes a guide part (51) held in the valve body (3) on the valve inlet (1) side, and a strainer held in the guide part (51) so as to be reciprocally movable. When the flow rate of the fluid flowing through the valve inlet (1) is small, the mesh portion (52) and the strainer spring (53) elastically supporting the strainer mesh portion (52) are provided. Most of the fluid flows through the strainer mesh portion (52), and when the flow rate of the fluid flowing through the valve inlet (1) increases to a certain level or more, the fluid passes through the strainer mesh portion (52). The strainer mesh part (52) is moved to the valve outlet (2) side against the strainer spring (53) due to the flow resistance at the time, and most of the fluid is transferred to the strainer mesh part ( Valve according to claim 1, characterized in that the manner can pass through 2) except.   The strainer mesh portion (52) includes a mesh-shaped filter portion (521) that captures dust such as iron powder but allows the passage of fluid, and a cylindrical portion (511) provided in the guide portion (51). The filter portion (521) is configured by a rod-shaped portion (523) disposed so as to be capable of reciprocating, and a holding portion (524) holding the filter portion (521) at one end of the rod-shaped portion (523). 3. A valve according to claim 2, characterized in that it has a conical part protruding towards the valve inlet (1).   The valve according to claim 3, wherein the filter part (521) has a mesh structure made of a resin material.   The valve according to any one of claims 1 to 4, wherein the valve is used as a pressure reducing valve.

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