JP2005226695A - Valve structure and check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve for preventing the occurrence of valve lock by preventing the biting of foreign matters into a sliding portion while reducing rattling in sliding a valve relative to a housing. <P>SOLUTION: The check valve 1 comprises the housing 3, the valve 10 silidable in the housing 3, a pipe joint 5 threaded to the housing 3 and arranged behind the valve 10, and a coil spring 16 for energizing the valve 10 to the side of a valve seat 33. The valve 10 consists of a fluid communication region 110 in which front sliding pieces 111 are provided protruding from the outer peripheral face of a small diameter cylinder portion 11a and a sliding region 12 in which rear sliding pieces 121 are provided protruding from the outer peripheral face of a large diameter cylinder portion 12a. The front sliding pieces 111 and the rear sliding pieces 121 are arranged in numbers at equally divided positions in the circumferential direction, and the front sliding pieces 111 and the rear sliding pieces 121 are arranged with their phases shifted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve structure that opens and closes a fluid communication path using a valve that slides in a housing, and a check valve.

  The check valve is configured to open the flow in one direction and stop the flow in the reverse direction. Generally, the check valve presses the valve and the valve that can slide in the housing. The fluid communication path is configured to be openable and closable by applying pressure to the valve against the urging force of the coil spring. In this check valve, various improvements have been made such as adjusting the flow rate at the time of opening appropriately and eliminating rattling when the valve slides in order to prevent noise generation when the valve is ON / OFF. It is.

  For example, as shown in FIG. 9, the check valve 50 of Patent Document 1 is formed so that the valve 51 provided in the housing 52 has a large size so as to eliminate rattling without increasing the length of the valve 51. A sliding area 510 formed in a diameter cylindrical shape and having a sliding portion 511, a fluid communication area 520 formed in a small diameter cylindrical shape so as to be able to press the valve seat 52a of the housing 52 and provided with a fluid communication hole 521; It is formed with.

  Since the valve 51 slides within the housing 52, the valve 51 is provided with a clearance with respect to the inner wall surface of the housing 52, and the sliding portion 511 formed on the outer peripheral surface of the sliding area 510 has a short length. When the amount of backlash is large, an unpleasant running sound is generated from the check valve 50 when water flows.

Therefore, in Patent Document 1, in order to solve this problem, in the fluid communication area 520, a plurality of protrusions are formed so as to expand from the outer peripheral surface of the cylindrical portion along the circumferential direction, and the sliding of the sliding area 510 is performed. A sliding part 522 having the same diameter as the part 511 and extending from the sliding part 511 is formed. Therefore, the sliding part 511 formed in the sliding area 510 and the sliding part 522 formed in the fluid communication area 511 are formed so that the part sliding in the housing 52 is a long distance. It is.
JP 2003-28325 A (refer to page 2, FIG. 1)

  However, when the fluid flows from the upstream side toward the downstream side, especially when the biasing force of the coil spring that biases the valve toward the valve seat side of the housing is weak, the fluid is not easily moved between the sliding valve and the inner wall of the housing. A so-called valve block is generated in which dust or foreign matter bites into the valve and stops sliding, and the generation of the valve block causes a malfunction of the check valve. In order to avoid this valve block, it is desirable to reduce the area of the sliding portion of the valve in the circumferential direction to prevent foreign matter from entering the valve between the inner wall surface of the housing.

  In the conventional check valve 50 shown in Patent Document 1, a plurality of sliding portions 522 formed in the fluid communication area 520 are disposed so as to protrude from the outer peripheral surface of the fluid communication area 520. Although the sliding contact area with the inner wall surface is made part of the circumferential direction to reduce the sliding contact area, a sliding surface with the inner wall surface of the housing 52 is formed over the entire circumference of the valve 51 in the sliding area 510. Therefore, if dust or foreign matter is mixed in the fluid flowing on the outer peripheral surface of the sliding area 510, the dust or foreign substance is likely to bite in the sliding area 510, and there is a possibility of generating a valve block. It was.

SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object thereof is to provide a valve structure and a check valve that can prevent looseness while increasing the interval between sliding parts to prevent looseness. In order to achieve this object, in the invention according to claim 1, a cylindrical housing, a valve that slides in the housing, and a fluid that is disposed in the valve and circulates fluid from upstream to the downstream side. A valve structure configured to be capable of opening and closing the fluid communication path by sliding the valve,
In the valve, a sliding portion facing the inner wall surface of the housing is formed so as to be slidable by a contact area reducing means in a circumferential direction with the inner wall surface of the housing. .

  The invention according to claim 2 is characterized in that the sliding portion is formed at both front and rear end portions in the axial direction of the valve.

  The invention according to claim 3 is characterized in that the contact area reducing means forms the sliding portion on a plurality of protruding pieces protruding from a cylindrical outer peripheral surface of the valve.

  According to a fourth aspect of the present invention, the contact area reducing means forms a gear-like shape by alternately forming the sliding portion in an uneven manner along the circumferential direction of the cylindrical outer peripheral surface of the valve. It is characterized by forming.

Furthermore, in the invention according to claim 5, the valve includes a fluid communication area formed in a small diameter cylindrical shape and a sliding area formed in a large diameter cylindrical shape,
In the fluid communication area, a fluid communication hole for forming the fluid communication path is formed, and
The sliding portion is arranged in the fluid communication area and the sliding area.

  In the invention described in claim 6, the sliding portions disposed at both ends are equally divided in the circumferential direction, and the sliding portion of the front end portion and the sliding portion of the rear end portion are provided. The parts are characterized in that they are arranged out of phase with respect to the circumferential direction.

According to the seventh aspect of the present invention, a cylindrical housing, a valve that slides in the housing, a fluid communication passage that is disposed in the valve and circulates fluid from upstream to the downstream side, and the valve A check valve configured to be capable of opening and closing the fluid communication path by sliding the valve;
The valve includes a fluid communication area formed in a cylindrical shape, and a sliding area formed in a cylindrical shape,
In the fluid communication area and the sliding area, a plurality of projecting pieces projecting from the cylindrical outer circumferential surface are arranged so as to be slidable in contact with the inner wall surface of the housing in equal divisions in the circumferential direction,
The protruding piece arranged in the fluid communication area and the protruding piece arranged in the sliding area are respectively arranged at positions shifted in phase with respect to the circumferential direction. .

  According to the first aspect of the present invention, in the valve structure, the sliding portion of the valve forms the sliding contact area with the inner wall surface of the housing smaller than the circumferential direction (contact area reducing means). Even if dust or foreign matter flows from the inflow side, it does not enter the sliding surface with a small clearance (between a plurality of protruding sliding portions and the inner wall of the housing), and the clearance around the sliding portion is large. Since it flows downstream from the site, it is possible to prevent biting of foreign matter on the sliding surface between the valve and the housing, thereby preventing the valve block.

  According to the second aspect of the present invention, the sliding portions can be slidably guided at intervals corresponding to the length of the valve by being arranged at both front and rear ends with respect to the axial direction of the valve. It is possible to reduce the size and prevent the generation of abnormal noise when the valve is ON / OFF.

  According to the invention described in claims 3 to 4, the contact area reducing means is a plurality of projecting pieces projecting the sliding portion from the cylindrical outer peripheral surface, or is formed in a gear shape, Since the contact area in the circumferential direction with the inner wall surface of the housing is reduced, the foreign matter does not enter the sliding surface with a small clearance even if foreign matter flows from the inflow side, as in the invention of claim 1. Since the flow from the portion having a large clearance around the sliding portion flows to the downstream side, it is possible to prevent the foreign matter from being bitten on the sliding surface between the valve and the housing, thereby preventing the valve block.

  According to the fifth aspect of the present invention, the valve is formed to have a fluid communication area having a fluid communication path and a sliding area, and the fluid flowing from the upstream side presses the valve to communicate with the fluid. And flows from the inside of the sliding area to the downstream side through the fluid communication path. At this time, in the fluid communication area and the sliding area, a plurality of projecting pieces projecting from the cylindrical outer peripheral surface are arranged along the circumferential direction as sliding parts, or a gear-shaped sliding part is arranged. Therefore, the flowing fluid flows to a part with a large clearance, that is, a part other than the sliding surface formed between the housing and the valve. It does not bite in-plane and does not generate a valve block.

  According to the sixth aspect of the present invention, the sliding portions arranged so as to protrude from both the front and rear end portions of the valve are arranged at equal intervals in the circumferential direction, thereby sliding with the inner wall of the housing. By providing a dynamic balance, sliding can be performed without rattling, and by disposing the sliding portions arranged in the fluid communication area and the sliding area at positions shifted from each other, one piece is provided. Even if the contact area is small, it is possible to provide a valve structure with little backlash by providing sliding portions at a large number of positions in the circumferential direction on the inner wall surface of the housing. In addition, since the contact area per piece is small, it is difficult for foreign matter to be bitten, and the valve block can be prevented.

  According to the seventh aspect of the invention, since the check valve has a small sliding area between the valve and the inner wall surface of the housing, for example, even if foreign matter flows from the inflow side, a sliding surface having a small clearance ( It flows without entering the space between the protruding plurality of sliding portions and the inner wall of the housing, and the valve block can be prevented.

  Further, the sliding portions protruding from the outer wall of the valve are arranged at both end portions in the axial direction of the valve, that is, the fluid communication region and the sliding region, so that the sliding surface is arranged at the longest interval of the valve. It can be formed, and rattling when the valve slides can be prevented.

  In addition, the sliding parts arranged so as to protrude from the front end of the fluid communication area and the end of the rearmost sliding area are arranged at equal intervals in the circumferential direction. The sliding balance between the inner wall and the inner wall can be reduced, and sliding can be performed without rattling, and the sliding parts arranged at the front and rear ends are arranged at positions that are out of phase with each other. Even if the area is small, a sliding structure is provided at many positions on the inner wall surface of the housing in the circumferential direction, and a valve structure with little backlash can be provided. Moreover, since the contact area per piece is small, the fluid flowing from the upstream side does not enter the sliding surface with a small clearance, but flows along a portion with a large clearance, so that the bite of the foreign object Intrusion is unlikely to occur and the valve block can be prevented.

  An embodiment of the present invention will be described with reference to the drawings. The check valve described below includes a fluid communication area and a sliding area, and the fluid flows from the upstream fluid communication area to the downstream sliding area. The upstream side is called the front part, and the downstream side is called the rear part.

  FIG. 1 shows a cross section of a check valve 1, which includes a housing 3 formed in a stepped cylindrical shape, a pipe joint 5 screwed into a large diameter portion of the housing 3 at a rear portion of the housing 3, and a housing 3 is provided with a valve 10 slidably disposed in a small-diameter portion of the housing 3 at a front portion of 3 and a coil spring 16 for urging the valve 10 forward.

  The front outer peripheral surface of the housing 3 has a male threaded portion 31 so that the check valve 1 can be mounted in a fluid circuit (not shown) and can be screwed together. The rear outer peripheral surface is mounted with the pipe joint 5. Therefore, the large diameter portion 32 is formed. The inside of the housing 3 opens the fluid flow in one direction by forming a valve seat 33 in the front part and making it contactable with the tip surface 14 of the valve 10. Further, a sliding surface 34 (hereinafter also referred to as an internal sliding surface) is formed on the front side of the inner peripheral surface, and a female screw portion 35 is formed on the rear side to restrict the sliding of the valve 10. The member 13 can be screwed.

  1 to 4, the valve 10 is formed in a cylindrical shape and has a fluid communication area 11 on the front side and a sliding area 12 on the rear side that can slide on the sliding surface 34 of the housing 3. Is formed.

  The fluid communication area 11 is arranged at a small diameter cylindrical portion 11a formed to have a smaller diameter than the sliding area 12, and a front end portion of the small diameter cylindrical portion 11a, and at a plurality of equally divided positions (four divided positions in the example shown in the figure). ) Is formed between the front sliding piece 111 (sliding part) 111 projecting from the outer peripheral surface of the small-diameter cylindrical part 11a and the front sliding piece 111 and the sliding area 12, and a plurality of them in the circumferential direction. And fluid communication holes 112 formed at locations (four locations in the illustrated example). The front sliding piece 111 is formed so as to be slidable on the inner sliding surface 34 of the housing 3.

  The sliding area 12 includes a large-diameter cylindrical portion 12a and a rear portion that is arranged at a plurality of equally divided positions (four-divided positions in the illustrated example) in the circumferential direction and protrudes from the rear end portion of the large-diameter cylindrical portion 12a. It has a sliding piece (sliding portion) 121 and a spring receiving seat 122 that latches one end of the coil spring 16 inside the large-diameter cylindrical portion 12 a, and the rear sliding piece 121 is a front portion of the fluid communication region 11. Similar to the sliding piece 111, it is formed so as to be slidable on the sliding surface 34 of the housing 3.

  As shown in FIG. 4, the front sliding piece 111 of the fluid communication area 11 and the rear sliding piece 121 of the sliding area 12 are arranged at positions shifted in phase along the circumferential direction. , It is desirable to be at 8 equal division positions.

  Therefore, by forming the front sliding piece 111 protruding from the small diameter cylindrical portion 11a and the rear sliding piece 121 protruding from the large diameter cylindrical portion 12a, contact with the inner sliding surface 34 of the housing 3 in the circumferential direction. The sliding surface 34 of the housing 3 of the valve 10 is slid by reducing the area and disposing the front sliding piece 111 and the rear sliding piece 121 at positions separated from each other at both ends of the valve 10. The backlash is reduced.

  The front sliding piece 111 formed in the fluid communication area 11 and the rear sliding piece 121 formed in the sliding area 12 are not divided into four equal parts, but are divided into two or three equal parts, or more than five equal parts. It may be formed.

  Further, the front end surface of the valve 10 (the front end surface on the fluid communication region 11 side) is formed with a contact surface 14 capable of contacting the valve seat 32 of the housing 3 and a rubber-like elastic sheet 15 is adhered thereto. In a state where the contact surface 13 of the valve 10 is in contact with the valve seat 33, the valve 10 is formed so that there is no fluid leakage.

  The stopper member 13 disposed behind the valve 10 at a position away from the rear end surface of the valve 10 is screwed into the female thread portion 35 in the housing 3 and has a spring receiving seat 131 to provide a spring receiver for the valve 10. The coil spring 16 is hooked between the seat 122. The coil spring 16 urges the valve 10 toward the valve seat 33 of the housing 3 and is compressed by the pressure of the fluid flowing from upstream.

  Next, the operation of the check valve 1 configured as described above will be described.

  The check valve 1 is connected to a fluid pipe (not shown) via a pipe joint 5 and constitutes a fluid circuit (not shown). In a state where no fluid flows from the upstream side, the check valve 1 closes the fluid communication path F by bringing the valve 10 into contact with the valve seat 33 of the housing 3 by the biasing force of the coil spring 16. ing.

  When the fluid flows from the upstream, the valve 10 is moved to the stopper member 13 side against the biasing force of the coil spring 16 by the pressure of the fluid. When the contact surface 14 of the valve 10 is separated from the valve seat 33 of the housing 3 together with the elastic seat 15, the fluid communication path F is opened, and most of the fluid is mainly in the fluid communication area 11 and mainly the sliding piece 111. Between the sliding surface 34 of the housing 3 excluding the sliding surface 34 and the outer peripheral surface of the small-diameter cylindrical portion 11a through the fluid communication hole 112 and into the small-diameter cylindrical portion 11a. It will enter into the pipe joint 5 through the inside of the cylinder part 12a, and will flow toward the downstream side.

  Further, a part of the fluid is part of the outer peripheral surface of the valve 10, that is, the outer peripheral surface of the housing 3 excluding the sliding surface 34 with the sliding piece 111, the outer peripheral surface of the small diameter cylindrical portion 11 a, and the sliding piece 121. From the rear end portion of the valve 10 to the inside of the stopper member 13 through the outer peripheral surface of the large diameter cylindrical portion 12a from between the sliding surface 34 of the housing 3 excluding the sliding surface 34 and the large diameter cylindrical portion 12a. , Will flow toward the downstream side.

  Accordingly, the dust and foreign matters mixed in the fluid still slide between the sliding surface 34 of the housing 3 except the sliding surface 34 with the sliding piece 111, the outer peripheral surface of the small-diameter cylindrical portion 11 a, and the sliding piece 121. The inside of the small-diameter cylindrical portion 11a passes through the fluid communication hole 112 from between the sliding surface 34 of the housing 3 excluding the surface 34 and the large-diameter cylindrical portion 12a.

  As described above, in the check valve 1 of the embodiment, the contact area between the sliding surface 34 of the housing 3 and the sliding piece 111 or 121 of the valve 10 is extremely small with respect to the circumferential direction. The dust and foreign matters mixed in the air flow while avoiding the sliding portion between the sliding surface 34 of the housing 3 and the sliding piece 111 or 121 of the valve 10 and do not generate a valve block. Moreover, since the sliding pieces 111 and 121 formed on the valve 10 are disposed at the front end portion of the fluid communication area 110 and the rear end portion of the sliding area 120 of the valve 3, they are separated from each other in the axial direction. It slides at the position, and the backlash between the valve 10 and the inner sliding surface 34 of the housing 3 is reduced to prevent the generation of abnormal noise.

  The valve structure or check valve of the present invention is not limited to the above-described form. For example, as shown in FIGS. 5 to 6, the rear sliding piece 121 </ b> A formed in the sliding area 12 is formed in a rectangular parallelepiped shape that is elongated in the axial direction by the length of the sliding area 12. In addition, in the fluid communication area 11, a collar part 11b extending from the large-diameter cylindrical part 12a of the sliding area 12 at a position shifted by 45 ° from the four rear sliding pieces 121A is provided along the circumferential direction. Are formed at four equally divided positions. Accordingly, the collar portion 11b is formed so as to protrude from the outer peripheral surface of the small-diameter cylindrical portion 11a in the direction in which the diameter is expanded at the four equally divided positions. Since the collar portion 11b is positioned lower than the outer peripheral surface of the rear sliding piece 121A, it is not in a sliding relationship with the inner sliding surface 34 of the housing 3. Of course, the collar portion 12b is formed to have the same outer diameter as the rear sliding piece 121A, or a front sliding piece having the same outer diameter as the rear sliding piece 121A is formed at the front end of the collar portion. It may be provided.

  Further, the sliding piece 111B (121B) that comes into sliding contact with the inner sliding surface of the housing may be formed in a gear shape as shown in FIG. That is, the front end portion of the fluid communication region 11 and the sliding region 12 include a plurality of radial grooves 113 with respect to the central axis from an outer diameter portion slightly smaller than the inner diameter of the inner sliding surface of the housing. 123 is formed in a concavo-convex shape in the circumferential direction. As a result, the contact area in sliding contact with the inner sliding surface of the housing can be reduced, and dust and foreign matter can flow along the grooves 113 and 123.

  Further, as shown in FIG. 8, the cylinder outside diameters of the fluid communication area 11C and the sliding area 12C are the same, and the front sliding piece 111C and the rear sliding piece 121C are connected to the front end of the cylinder part of the fluid communication area 11C. And projectingly formed on the rear end face of the cylindrical portion of the sliding area 12C, as in FIG. When the valve 10C opens the fluid communication path, the fluid flow mainly flows in the fluid communication area 11C and the sliding area 12C excluding the sliding portion between the inner sliding surface of the housing 3 and the sliding pieces 111C and 121C. It flows on the outer peripheral surface of the cylindrical portion and flows into the stopper member from the rear end of the valve 10C or through the fluid communication hole 112C, and the valve block can be prevented. At this time, even if the fluid communication hole 112C is deleted, the fluid communication path is formed on the outer peripheral surface of the valve 10C and flows from the outer peripheral surface of the valve 10B to the downstream side, thereby achieving the same effect. be able to.

It is sectional drawing which shows the non-return valve by one form of this invention. It is a perspective view which shows the valve | bulb in FIG. It is a front view which shows the valve | bulb in FIG. It is A arrow directional view in FIG. It is a perspective view which shows the valve | bulb by another form in FIG. It is the same side view. It is a side view which shows another form of the sliding piece formed in the valve | bulb in FIG. It is a front view which shows another form of the valve | bulb in FIG. It is sectional drawing which shows the conventional check valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, Check valve 3, Housing 33, Valve seat 34, Sliding surface 10, Valve 11, Fluid communication area 111, Front sliding piece 112 Fluid communication hole 12, Sliding area 121, Rear sliding piece 16, Coil Spring

Claims (7)

A tubular housing; a valve that slides within the housing; and a fluid communication passage that is disposed within the valve and circulates fluid from the upstream to the downstream side, and the fluid communication is performed by sliding the valve. A valve structure configured to open and close the passage,
The valve structure is characterized in that a sliding portion facing the inner wall surface of the housing is formed in the valve so as to be slidable by a contact area reducing means in a circumferential direction with the inner wall surface of the housing.   The valve structure according to claim 1, wherein the sliding portion is formed at both front and rear end portions with respect to an axial direction of the valve.   The valve structure according to claim 1 or 2, wherein the contact area reducing means forms the sliding portion on a plurality of protruding pieces protruding from a cylindrical outer peripheral surface of the valve.   The contact area reducing means is characterized in that the sliding portion is formed in a gear shape by alternately and unevenly forming the sliding portion along a circumferential direction of a cylindrical outer peripheral surface of the valve. The valve structure according to 1 or 2. The valve includes a fluid communication area formed in a small diameter cylindrical shape and a sliding area formed in a large diameter cylindrical shape,
In the fluid communication area, a fluid communication hole for forming the fluid communication path is formed, and
The valve structure according to claim 1, 2, 3, or 4, wherein the sliding portion is disposed in the fluid communication area and the sliding area.   The sliding portions arranged at both ends are equally divided in the circumferential direction, and the sliding portion at the front end and the sliding portion at the rear end are respectively in the circumferential direction. 6. The valve structure according to claim 2, 3, 4 or 5, wherein the valve structures are arranged out of phase. A cylindrical housing, a valve that slides in the housing, a fluid communication passage that is disposed in the valve and allows fluid from upstream to flow downstream, and biases the valve toward the valve seat of the housing A check valve configured to be capable of opening and closing the fluid communication path by sliding the valve,
The valve includes a fluid communication area formed in a cylindrical shape, and a sliding area formed in a cylindrical shape,
In the fluid communication area and the sliding area, a plurality of projecting pieces projecting from the cylindrical outer circumferential surface are arranged so as to be slidable in contact with the inner wall surface of the housing in equal divisions in the circumferential direction,
A check valve characterized in that the protruding piece arranged in the fluid communication area and the protruding piece arranged in the sliding area are arranged at positions out of phase with respect to the circumferential direction. .

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