JP2011080571A - Check valve - Google Patents

Abstract

An object of the present invention is to prevent vibrations as much as possible with a simple and economical configuration, and to suppress noises satisfactorily.
A check valve 10 is slidably disposed in a main body 12 provided with a fluid flow path 14, a valve seat 16 provided in the middle of the fluid flow path 14, and the main body 12. A valve mechanism 28 having a valve body 26 that can be seated on the valve seat 16, a guide ring 40 that surrounds the shaft portion 38 of the valve body 26 and abuts against the guide member 22, and a step portion 36 of the valve body 26 A spring 50 having both ends supported by the flange portion 42 of the guide ring 40 is provided. Before the check valve 10 is assembled, the diameter of the shaft portion 38 constituting the valve body 26 is set to a dimension equal to or larger than the inner diameter of the guide ring 40, and the guide ring 40 has a slit 46 extending in the axial direction. Have
[Selection] Figure 1

Description

  The present invention relates to a check valve having a function of always maintaining a fluid flow in a certain direction and preventing the fluid from flowing backward.

  In a filling system that fills a fuel tank with a fluid, for example, high-pressure gas (fuel gas), a check valve is used to prevent the high-pressure gas after filling from flowing backward.

  This type of check valve generally closes (closes) the fluid flow path by pressing a valve body through a spring against a valve seat provided in the fluid flow path. The valve body is separated from the valve seat against the elastic force of the spring through the pressure of the fluid flowing through the fluid channel, thereby opening (opening) the fluid channel. .

  However, in the conventional check valve, when the fluid suddenly flows when the valve is opened, or when the pressure by the fluid and the elastic force of the spring antagonize, the valve body tends to open and close frequently. For this reason, there exists a problem that the sound by the vibration at the time of opening and closing of a valve body, ie, a noise, generate | occur | produces.

  In order to obtain a check valve that does not generate vibration noise, for example, a check valve disclosed in Patent Document 1 is known. As shown in FIG. 10, this check valve includes a valve housing 1 having a cylindrical shape, and a fluid passage 2 is formed in a shaft portion of the valve housing 1. A valve seat 3 is provided in the middle of the fluid passage 2, and a valve guide 4 is fixed in the valve housing 1.

  The valve guide 4 has a bottomed guide cylinder 4a, and a bottomed cylindrical portion 5a of the valve body 5 is slidably fitted to the open side of the bottomed guide cylinder 4a. The bottomed guide cylinder 4a and the bottomed cylindrical portion 5a form a pressure chamber 6, and this pressure chamber 6 has an air damper action, and a compression spring 7 is accommodated in the pressure chamber 6. ing. The distal end portion of the valve body 5 has a tapered shape corresponding to the valve seat 3 and is attached with an O-ring 8.

  In the check valve configured as described above, an air damper action is obtained by the pressure in the pressure chamber 6, so that a vibration phenomenon does not occur when the valve is opened, and noise due to vibration does not occur.

JP 2001-99340 A

  However, since the pressure chamber 6 is formed in the valve guide 4 and the valve body 5 in the above Patent Document 1, there is a problem that the structure is considerably complicated and the manufacturing cost of the check valve is increased. In addition, since the compression spring 7 is housed in the pressure chamber 6, the compression spring 7 itself is downsized, and there is a problem that the spring force is limited.

  The present invention solves this type of problem, and provides a check valve capable of preventing the occurrence of vibrations as much as possible with a simple and economical configuration and capable of satisfactorily suppressing noise. The purpose is to provide.

  The present invention provides a main body provided with a fluid flow path, a valve seat provided in the main body part in the middle of the fluid flow path, and slidably disposed in the main body, and seated on the valve seat A valve mechanism having a possible valve body, a guide ring that surrounds the shaft portion of the valve body and abutting against the inner wall of the main body, and one end supported by the valve body, while the other end is the guide The present invention relates to a check valve including a spring supported by a ring and biasing the valve body toward the valve seat.

  Before assembling the check valve, the diameter of the shaft portion of the valve body is set to a dimension equal to or larger than the inner diameter of the guide ring, and the guide ring or the shaft portion has a slit extending in the axial direction. Thus, the diameter is configured to be freely expandable and contractible.

  In the check valve, the guide ring has a ring portion on which the spring is mounted, and before the check valve is assembled, the outer diameter of the ring portion is set to be larger than the inner diameter of the spring. .

  Furthermore, in the check valve, the guide ring has a slit extending in the axial direction, and the diameter of the shaft portion of the valve body is increased from the contact position with the guide ring toward the tip of the valve body. A tapered portion is provided, and the diameter of the contact position of the shaft portion is set to the same dimension as the inner diameter of the guide ring before the check valve is assembled.

  According to the present invention, before assembling the check valve, the diameter of the shaft portion of the valve body is set to a dimension equal to or larger than the inner diameter of the guide ring. For this reason, when the valve body opens and closes in a state where the guide ring is externally mounted on the shaft portion, a radial force is applied between the shaft portion and the guide ring to bring them into contact with each other. Large sliding resistance is generated. Therefore, the sliding resistance acts in the direction opposite to the vibration force of the valve body, and the dashpot effect is obtained. Thereby, with a simple and economical configuration, generation of vibration can be prevented as much as possible, and noise can be suppressed satisfactorily.

  Further, according to the present invention, before the check valve is assembled, the outer diameter of the ring portion constituting the guide ring is set to be larger than the inner diameter of the spring. For this reason, when the valve body opens and closes in a state in which the spring is mounted on the ring portion, a radial force is applied between the ring portion and the spring to bring them into contact with each other. Sliding resistance is generated. Therefore, the sliding resistance acts in the direction opposite to the vibration force of the valve body, and the dashpot effect is obtained. Thereby, with a simple and economical configuration, generation of vibration can be prevented as much as possible, and noise can be suppressed satisfactorily.

  Further, according to the present invention, the shaft portion of the valve body is provided with a taper portion that increases in diameter from the contact position with the guide ring toward the tip of the valve body, and before assembling the check valve, The diameter of the contact position of the shaft portion is set to the same dimension as the inner diameter of the guide ring. For this reason, sliding resistance does not occur at the valve closing position of the valve body, and the valve opening pressure of the valve body does not increase.

  In addition, when the valve element opens, the guide ring relatively moves toward the tapered portion, and a gradually increasing sliding resistance is generated between the guide ring and the tapered portion. Therefore, the sliding resistance acts in the direction opposite to the vibration force of the valve body, and the dashpot effect is obtained. Thereby, with a simple and economical configuration, generation of vibration can be prevented as much as possible, and noise can be suppressed satisfactorily.

It is a schematic structure explanatory view of a check valve concerning a 1st embodiment of the present invention. It is a perspective explanatory view of a guide ring constituting the check valve. It is front explanatory drawing of the said guide ring. It is operation | movement explanatory drawing when the said non-return valve opens. It is schematic structure explanatory drawing of the non-return valve which concerns on the 2nd Embodiment of this invention. It is front explanatory drawing of the guide ring which comprises the said check valve. It is explanatory drawing of the spring which comprises the said check valve. It is schematic structure explanatory drawing of the non-return valve which concerns on the 3rd Embodiment of this invention. It is operation | movement explanatory drawing when the said non-return valve opens. FIG. 6 is a cross-sectional explanatory view of a check valve disclosed in Patent Document 1.

  As shown in FIG. 1, the check valve 10 according to the first embodiment of the present invention is not shown, but for example, a fuel gas filling system for filling a fuel tank with a fuel gas (fluid) that is a high-pressure gas. Used for.

  The check valve 10 includes a main body portion 12. The main body portion 12 has a substantially cylindrical shape, and a fluid flow path 14 is formed in the main portion 12 extending in the axial direction (direction of arrow A). . A tapered valve seat 16 is provided at the front end in the flow direction of the fluid flow path 14, and a large diameter flow path 18 is formed at the front end side of the valve seat 16. A guide member 22 is attached to an end portion of the main body portion 12 on the large diameter flow path 18 side via a screw portion 20.

  The guide member 22 is formed with one or more discharge passages 24 penetrating in the axial direction (arrow A direction). One end side of the discharge flow path 24 communicates with the large diameter flow path 18, and the other end side of the discharge flow path 24 communicates with a fluid filling portion (not shown) such as a fuel tank.

  A valve body 26 is slidably disposed in the direction of arrow A inside the main body 12 and the guide member 22, and the valve mechanism 28 is configured by the valve body 26 and the valve seat 16. The valve body 26 is formed of, for example, stainless steel, and a tapered portion 30 that can be seated on the valve seat 16 is provided at a tip portion. A circumferential groove 32 is formed on the rear end side of the tapered portion 30 where the diameter is increased, and a seal member 34 is disposed in the circumferential groove 32.

  The valve body 26 is provided with a small-diameter shaft portion 38 through a step portion 36 on the outer peripheral portion extending in the axial direction from the end portion of the circumferential groove 32. The shaft portion 38 extends in the arrow A direction and is inserted into the guide member 22.

  A guide ring 40 is disposed so as to surround the shaft portion 38 of the valve body 26 and to contact the inner wall portion 22a of the guide member 22. The guide ring 40 is made of a resin material, such as PTFE (polytetrafluoroethylene).

  As shown in FIGS. 2 and 3, the guide ring 40 includes a large-diameter flange portion 42 and a small-diameter ring portion 44 that is integrally formed with the flange portion 42 concentrically. The guide ring 40 has a slit 46 that extends in the axial direction by cutting out from the flange portion 42 to the ring portion 44. The diameter of the guide ring 40 can be expanded and contracted through the slit 46.

  The inner peripheral surface 48 of the guide ring 40 is set to the inner diameter D1 in a state where no external force is applied to the guide ring 40, for example, a state before assembly. As shown in FIG. 1, the shaft portion 38 of the valve body 26 to which the guide ring 40 is attached has a diameter D2, and the diameter D2 is set to a dimension equal to or larger than the inner diameter D1 of the guide ring 40 (D1). ≦ D2, more preferably D1 <D2).

  Both ends of the spring 50 are in contact with the step portion 36 of the valve body 26 and the flange portion 42 of the guide ring 40. The valve body 26 is constantly urged toward the valve seat 16 through the elastic force of the spring 50.

  The operation of the check valve 10 configured as described above will be described below.

  As shown in FIG. 1, the check valve 10 is configured such that the valve body 26 is pressed toward the valve seat 16 under the biasing action of the spring 50 when no fluid is supplied to the fluid flow path 14. The tapered portion 30 is seated on the valve seat 16 and is maintained in a closed state. When a fluid is introduced into the fluid flow path 14, the fluid comes into contact with the tip of the valve body 26 and presses the valve body 26 toward the guide member 22.

  When the pressure of the fluid supplied to the fluid flow path 14 becomes equal to or higher than the set pressure, the valve body 26 moves toward the guide member 22 against the elastic force of the spring 50 (in the direction of arrow A1). Therefore, since the taper portion 30 is separated from the valve seat 16, the valve mechanism 28 is opened (see FIG. 4).

  In this case, in the first embodiment, the diameter D2 of the shaft portion 38 constituting the valve body 26 is set to a dimension equal to or larger than the inner diameter D1 of the guide ring 40 in a state where no external force is applied to the guide ring 40. . For this reason, in the state in which the guide ring 40 is interposed in the shaft portion 38, a radial force that brings the shaft portion 38 and the guide ring 40 into contact with each other acts, and the valve body 26 opens (in the direction of arrow A1). ), A relatively large sliding resistance is generated between the shaft portion 38 and the guide ring 40.

  Therefore, the sliding resistance acts in the opposite direction to the vibration force of the valve body 26, and a dashpot effect is obtained. As a result, the check valve 10 can prevent vibrations as much as possible with a simple and economical configuration, and can effectively suppress noise.

  When the valve element 26 is opened away from the valve seat 16, the fluid supplied to the fluid flow path 14 is introduced into the large diameter flow path 18 and then a plurality of discharge flow paths as shown in FIG. 4. 24 to the desired fluid filling section. On the other hand, when the supply of fluid to the fluid flow path 14 is reduced or stopped, the valve body 26 moves in the direction of arrow A2 under the elastic action of the spring 50, and the tapered portion 30 is seated on the valve seat 16 and closed. To be spoken. At that time, a relatively large sliding resistance is generated between the shaft portion 38 of the valve body 26 and the guide ring 40, vibration is suppressed, and generation of noise can be prevented as much as possible. .

  In the first embodiment, the guide ring 40 is made of PTFE resin. However, the guide ring 40 is not limited to this, and other resin, rubber, metal, or the like may be used.

  Further, a slit 46 is formed in the guide ring 40, and the inner diameter D1 of the guide ring 40 is configured to be freely expandable and contractible. Alternatively, the shaft portion 38 may be formed of a hollow shaft, and a slit may be formed in the shaft portion 38 in the axial direction so that the diameter D2 of the shaft portion 38 can be expanded and contracted.

  FIG. 5 is a schematic configuration explanatory view of a check valve 60 according to the second embodiment of the present invention. In addition, the same referential mark is attached | subjected to the component same as the non-return valve 10 which concerns on 1st Embodiment, and the detailed description is abbreviate | omitted. Similarly, in the third embodiment described below, detailed description thereof is omitted.

  The check valve 60 includes a guide ring 62 and a spring 64 which are different from the check valve 10 described above. As shown in FIG. 6, the guide ring 62 is a resin molded body that integrally molds a large-diameter flange portion 66 and a ring portion 68 concentrically. The guide ring 62 is not provided with a slit, and an outer diameter D3 of the ring portion 68 is set.

  As shown in FIG. 7, the spring 64 has an inner diameter D4 before assembly of the check valve 60, that is, in a state where no external force is applied. The inner diameter D4 is set to be smaller than the outer diameter D3 of the ring portion 68 constituting the guide ring 62 (D3 ≧ D4, more preferably D3> D4).

  In the second embodiment configured as described above, the spring 64 is externally mounted on the outer periphery of the ring portion 68 of the guide ring 62 in a predetermined pressure-bonded state with the check valve 60 assembled. Here, since a radial force for bringing the ring portion 68 and the spring 64 into contact with each other acts, there is a comparison between the ring portion 68 constituting the guide ring 62 and the spring 64 when the valve body 26 is opened and closed. Large sliding resistance is generated.

  Therefore, the check valve 60 has a simple and economical configuration, can prevent the generation of vibrations as much as possible, and can suppress the noise satisfactorily. The same effect can be obtained.

  In the second embodiment, the guide ring 62 is not provided with a slit, but the guide ring 62 is provided with a slit in the same manner as the guide ring 40 of the first embodiment, and the guide ring 62 and the shaft portion 38 are provided. You may comprise so that sliding resistance may be generate | occur | produced between. As a result, a sliding resistance is generated between the shaft portion 38 and the guide ring 62 and between the guide ring 62 and the spring 64, respectively. An effect is obtained.

  FIG. 8 is an explanatory diagram of a schematic configuration of a check valve 80 according to the third embodiment of the present invention.

  The check valve 80 includes a valve body 82 and a guide ring 84 (configured in the same manner as the guide ring 40) different from the check valve 10 described above. The valve body 82 is provided with a tapered portion 88 that increases in diameter from the contact position 86 with the guide ring 84 toward the tip end of the shaft portion 38. The guide ring 84 is provided with a slit 90, and before the check valve 80 is assembled, the inner diameter of the guide ring 84 and the diameter of the contact position 86 of the shaft portion 38 are set to the same dimension.

  In the third embodiment configured as described above, the diameter of the contact position 86 of the shaft portion 38 constituting the valve body 82 is set to the same size as the inner diameter of the guide ring 84 before the check valve 80 is assembled. Has been. For this reason, sliding resistance does not occur at the valve closing position of the valve body 82, and the valve opening pressure of the valve body 26 does not increase.

  Furthermore, as shown in FIG. 9, when the valve body 82 opens, the guide ring 84 moves toward the tapered portion 88, and the guide ring 84 and the tapered portion 88 are in contact with each other. Directional force starts working, and sliding resistance increases gradually. Accordingly, a dashpot effect due to sliding resistance can be obtained, and the check valve 80 can prevent the occurrence of vibration as much as possible with a simple and economical configuration, and can satisfactorily suppress noise. For example, the same effects as those of the first and second embodiments can be obtained.

  In addition, you may combine said taper part 88 and the guide ring 84 with a slit with 1st and 2nd embodiment. In this case, when the valve element opens, a sliding resistance that gradually increases is added to the valve body, and the occurrence of vibration can be suitably suppressed.

DESCRIPTION OF SYMBOLS 10, 60, 80 ... Check valve 12 ... Main-body part 14 ... Fluid flow path 16 ... Valve seat 22 ... Guide member 24 ... Discharge flow path 26, 82 ... Valve body 28 ... Valve mechanism 30, 88 ... Tapered part 38 ... Shaft Part 40, 62, 84 ... Guide ring 42, 66 ... Flange part 44, 68 ... Ring part 46, 90 ... Slit part 48 ... Inner peripheral surface 50, 64 ... Spring 86 ... Contact position

Claims (5)

A main body provided with a fluid flow path;
A valve seat provided in the main body portion in the middle of the fluid flow path, and a valve mechanism having a valve body that is slidably disposed in the main body portion and can be seated on the valve seat;
A guide ring that surrounds the shaft portion of the valve body and abuts against an inner wall portion of the main body portion;
One end is supported by the valve body, the other end is supported by the guide ring, and a spring that biases the valve body toward the valve seat side,
A check valve comprising:
Before assembling the check valve, the diameter of the shaft portion of the valve body is set to a dimension equal to or larger than the inner diameter of the guide ring,
The check ring is characterized in that the guide ring or the shaft portion has a slit extending in the axial direction and is configured such that the diameter dimension can be expanded and contracted. The check valve according to claim 1, wherein the guide ring has a ring portion on which the spring is sheathed.
Before assembling the check valve, the outer diameter of the ring portion is set to a dimension larger than the inner diameter of the spring.   The check valve according to claim 1 or 2, wherein the shaft portion of the valve body is provided with a tapered portion that expands from a contact position with the guide ring toward a tip of the valve body. Check valve. A main body provided with a fluid flow path;
A valve seat provided in the main body portion in the middle of the fluid flow path, and a valve mechanism having a valve body that is slidably disposed in the main body portion and can be seated on the valve seat;
A guide ring that surrounds the shaft portion of the valve body and abuts against an inner wall portion of the main body portion;
One end is supported by the valve body, the other end is supported by the guide ring, and a spring that biases the valve body toward the valve seat side,
A check valve comprising:
The guide ring has a ring portion on which the spring is sheathed,
Before assembling the check valve, the outer diameter of the ring portion is set to be larger than the inner diameter of the spring. A main body provided with a fluid flow path;
A valve seat provided in the main body part in the middle of the fluid flow path, and a valve mechanism having a valve body slidably disposed in the main body part and seatable on the valve seat;
A guide ring that surrounds the shaft portion of the valve body and abuts against the inner wall portion of the main body portion;
One end is supported by the valve body, the other end is supported by the guide ring, and a spring that biases the valve body toward the valve seat side,
A check valve comprising:
The guide ring has a slit extending in the axial direction;
The shaft portion of the valve body is provided with a tapered portion that expands from the contact position with the guide ring toward the tip of the valve body,
Before assembling the check valve, the diameter of the contact position of the shaft portion is set to the same size as the inner diameter of the guide ring.

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