JP2010007854A - Check valve, and poppet-type solenoid valve employing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-life check valve provided with a seal member capable of sealing a valve seat against a fluid flowing from high-pressure to low-pressure parts to surely prevent backflow and usable for a long period. <P>SOLUTION: The check valve 10 includes a valve chest 14, a sealing member 29, a poppet 16, and a spring member 24. In the valve chest 14, a valve seat 15 is formed to have an inflow path 12 and an outflow path 13 both for a fluid. The inside peripheral face of the valve seat 15 is formed in a cylindrical shape. The diameter of the valve seat 15 is reduced gradually toward the outflow path 13. The sealing member 29, which comes in contact or separates with/from the valve seat 15, opens/closes freely the space between the inflow path 12 and the outflow path 13. The poppet 16 is provided with a sealing member 29, and is freely slidable in the valve chest 14. The spring member 24 urges the poppet 16 toward the valve seat 15. A pressurized-oil relief-hole 31 is provided in the bottom of a sealing groove 30 for fitting the sealing member 29. Thus, in establishing a liquid-tight state between the valve seat 15 and a sealing part 20 of the poppet 16, the sealing member 29 is prevented from floating from the sealing groove 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a check valve for preventing a fluid such as high-pressure gas or high-pressure oil from flowing back in a circuit, and a poppet-type solenoid valve using the check valve.

As is well known, when a control valve or the like provided upstream or downstream of the check valve is operated and fluid flows from the upstream to the downstream of the check valve, the pressure of the primary fluid whose pressure has increased is known. The poppet is pressed by the pressure, the poppet is separated from the inflow passage, and a seal member provided on the poppet opens the valve seat so that the fluid flows from the inflow passage side to the outflow passage side of the check valve. .
On the other hand, when the control valve or the like is operated to stop the fluid and the pressure of the primary side fluid is reduced, the elastic force of the urging means such as a spring member that urges the poppet toward the inflow path side, The poppet is pressed toward the inflow path, the seal member seals the valve seat and closes the valve seat, the flow of fluid from the inflow path to the outflow path is stopped, and the fluid moves from the outflow path side to the inflow path side. It does not flow backward.

Therefore, as described in Patent Document 1, it has a fluid inflow path 33 and an outflow path 34, and an inner peripheral surface 32 a is formed in a cylindrical shape and is reduced in diameter toward the inflow path 33. The valve chamber 32 in which the valve seat 35 is formed, the seal member 58 that can be opened and closed between the inlet passage 33 and the valve chamber 32 by being in contact with and separated from the valve seat 35, and the seal member 58 is provided. There has been proposed a check valve 1 including a poppet 5 that can reciprocate in a chamber 32 and a biasing means 6 that biases the poppet 5 toward the valve seat 35.
In the check valve 1, the valve seat 35 projects and bends toward the valve chamber 32 while extending from the inflow path 32 to the inner peripheral surface 32 a in the cross section including the axis O <b> 1 of the valve chamber 32, and the seal One bending point Pc that can be in close contact with the member 58 is formed.
Further, a holding ring 59 for supporting the seal member 58 is fitted to the small diameter portion 54 of the poppet 5 in which the seal member 58 is fitted to the seal portion 56, and the base end portion 59a of the holding ring 59 is popped. It is caulked to 5. (For example, refer to Patent Document 1).

JP 2007-205406 A

In Patent Document 1, since the valve seat to which the seal member is in close contact is formed with inclined surfaces having different inclinations, and the holding ring that supports the seal member is crimped to the poppet, the processing is complicated and the number of parts is reduced. Increases the complexity of the structure, resulting in increased costs.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a check valve characterized in that the number of parts is reduced by simplifying the structure and internal leakage is made zero at the time of closing, and a poppet type using the check valve An object is to provide a solenoid valve.

In order to solve the above-mentioned problem, the invention according to claim 1 has a valve seat having an inflow passage and an outflow passage for a fluid, and having an inner peripheral surface formed in a cylindrical shape and having a diameter reduced toward the outflow passage. A valve chamber formed with,
A seal member that is capable of opening and closing between the inflow passage and the valve chamber by contacting and separating from the valve seat;
A poppet provided with the sealing member and reciprocating in the valve chamber;
A biasing means having a resilient force to bias the poppet toward the valve seat;
A check valve with
A pressure reducing hole for guiding the pressure of the outflow passage secured at the low pressure side pressure is provided at the bottom of the seal groove for fitting the seal member for fluid-tightening between the valve seat and the seal portion of the poppet. Thus, when the pressure oil passes between the valve seat and the seal portion of the poppet from the inflow path to the outflow path, the seal member is prevented from floating from the seal groove.
According to the present invention, a pressure reducing hole is provided in a bottom portion of a seal groove for fitting the seal member for liquid-tightening between the valve seat and the seal portion of the poppet, and the valve seat and the poppet seal portion When the space is made fluid-tight, the seal member can be prevented from floating above the seal groove, so that the seal member prevents the seal member from protruding from the seal groove, and the seal member is not peeled off, thereby extending the life. be able to.

According to a second aspect of the present invention, there is provided a valve chamber having a fluid inflow passage and an outflow passage, an inner peripheral surface of which is formed in a cylindrical shape, and a valve seat having a reduced diameter as it is directed to the outflow passage. ,
A seal member that is capable of opening and closing between the inflow passage and the valve chamber by contacting and separating from the valve seat;
A poppet provided with the sealing member and reciprocating in the valve chamber;
A biasing means having a resilient force to bias the poppet toward the valve seat;
A check valve with
A pressure-reducing hole that is provided at the bottom of a seal groove for fitting the seal member for liquid-tightening between the valve seat and the seal portion of the poppet and guides the pressure of the outflow passage secured at a low-pressure side pressure; ,
A check valve provided between the decompression hole and the outflow passage and blocking the decompression hole and the outflow passage;
Have
When pressure oil flows from the outflow path to the inflow path, the check valve prevents the pressure oil flowing from the outflow path to the decompression hole and prevents the seal member from floating from the seal groove. .
According to the present invention, when the pressure oil flows from the outflow path to the inflow path, the check valve prevents the pressure oil flowing from the outflow path to the decompression hole and prevents the seal member from floating from the seal groove. In addition, since the seal member prevents the seal member from coming off from the seal groove, the service life can be extended.
According to the third aspect of the present invention, since the check valve is built in, it is possible to reliably prevent leakage of the pressure oil in the valve.

  The present invention provides a pressure reducing hole or a pressure reducing guide for guiding the pressure of the outflow passage secured at a low pressure side pressure to the bottom of a seal groove for fitting a seal member for fluid-tightening between a valve seat and a seal portion of a poppet. A check valve for blocking the pressure reducing hole and the outflow path is provided between the hole and the outflow path, and when sealing between the valve seat and the seal portion of the poppet, the seal member is lifted from the seal groove Can be prevented and the life can be extended.

Hereinafter, preferred embodiments of the check valve of the present invention will be described and described in detail with reference to the accompanying drawings. FIG. 1 shows a longitudinal sectional view of a check valve 10 according to a first embodiment of the present invention.
In FIG. 1, a cylindrical sleeve 11 screwed into a solenoid body 41 of the poppet-type solenoid valve 40 (hereinafter referred to as a solenoid valve 40) in FIG. 2 has an inflow path 12 in the radial direction and one end of the sleeve 11. And an outflow passage 13 oriented in the axial direction. The sleeve 11 has an inner circumferential surface formed in the valve chamber 14 and a valve seat 15 having an inclined surface (seal portion) whose diameter is reduced on one end side (right side in FIG. 1).

  A poppet (valve element) 16 is slidably fitted in the valve chamber 14 of the sleeve 11. The poppet 16 has a stepped cylindrical shape, the large diameter portion 17 is slidably inserted into the valve chamber 14 of the sleeve 11, and the small diameter portion 18 is reduced in diameter relative to the valve chamber 14. A gap 19 is formed in the radial direction from the valve chamber 14. Further, a conical portion 21 having an inclined surface 20 (seal portion) that engages with an inclined surface of the valve seat 15 of the sleeve 11 is provided at one end portion (right end in FIG. 1) of the poppet 16.

The poppet 16 is provided with a stepped opening 22 having a circular cross section, and a spring member 24 that presses the poppet 16 by a resilient force is fitted into the large diameter portion 23 of the stepped opening 22. .
Reference numeral 25 is a bush fitted to the valve chamber 14 of the sleeve 11 to position the spring member 24 and adjust the resilience of the spring member 24. A needle valve 42 of a solenoid valve 40 is slidably inserted and supported in the inner hole 26 of the bush 25. One end of the needle valve 42 (the right end in FIG. 1) is formed in the conical portion 43, the conical portion 43 is housed in the small opening 27 having a circular cross section, and the tip of the conical portion 43 is drilled in the poppet 16. It enters the provided pore 28.

On the inclined surface 20 of the poppet 16, an O-ring (seal member) 29 that makes the conical portion 21 and the valve seat 15 liquid-tight is fitted in an O-ring groove (seal groove) 30. In order to prevent the O-ring groove 30 from being lifted by pressure oil, the O-ring groove 30 is a relief hole (pressure-reducing hole) that communicates the pressure of the outflow passage 13 secured at the low-pressure side pressure to the O-ring groove 30 from the pore 28. ) 31 and the O-ring groove 30 is held at a low pressure. A plurality of, for example two, escape holes 31 are provided in the circumferential direction and communicate with the pores 28. In this case, it is sufficient that at least one escape hole 31 is formed, and two or more escape holes may of course be used.
Reference numeral 32 is a stepped communication hole that communicates the inflow passage 12 with the small opening 27, and communicates with the pore 28.

FIG. 2 is a schematic longitudinal sectional view of the solenoid valve 40 assembled with the check valve 10 of FIG. As shown in FIG. 2, the solenoid valve 40 has a solenoid coil 45 integrally incorporated in a solenoid case 44 and is integrally attached to a member indicated by a two-dot chain line, for example, a valve body 46. A plunger 47 is slidably fitted into the solenoid body 41, and the plunger 47 moves in the arrow X direction or the Y direction by the excitation action of the solenoid body 41 by the excitation of the solenoid coil 45. That is, when the plunger 47 is displaced in the arrow X direction by the exciting force of the solenoid body 41 when the solenoid coil 45 is turned ON, the needle valve 42 cooperates with the plunger 47 against the elastic force of the spring member 48 and moves in the arrow X direction. The plunger 47 is moved in the arrow Y direction by the elastic force of the spring member 48 when the solenoid coil 45 is OFF. Reference numeral 49 is a power supply connector for the solenoid valve 40 and is attached to the solenoid case 44. Since the configuration of the solenoid valve 40 is known, a detailed description thereof will be omitted.

The operation of the check valve 10 accompanying the operation of the solenoid valve 40 of FIG. 2 will be described.
In FIG. 2, it is assumed that the pressure in the inflow path 12 is higher than the pressure in the outflow path 13.
When the plunger 47 moves in the arrow X direction by excitation of the solenoid coil 45, the needle valve 42 also cooperates, and the conical portion 43 of the needle valve 42 is detached from the pore 28. For this reason, since the pressure oil in the stepped opening 22 (small opening 27) flows out from the pores 28 to the outflow passage 13, the pressure in the stepped opening 22 of the poppet 16 is reduced, and the pressure oil on the high pressure side is reduced. Acting in the direction of arrow X of the poppet 16 through the gap 19 from the inflow path 12. As a result, the poppet 16 moves in the direction of the arrow X, the contact between the valve seat 15 of the sleeve 11 and the conical portion 21 of the poppet 16 is released, and a gap is maintained between the valve seat 15 and the inclined surface 20, and the high pressure side The pressure oil flows between the valve seat 15 and the inclined surface 20 from the inflow path 12 to the outflow path 13.

  When the solenoid coil 45 is de-energized, the plunger 47 moves in the arrow Y direction due to the elastic force of the spring member 48, and at the same time, the needle valve 42 moves in the arrow Y direction in cooperation with the plunger 46. The tip of the portion 43 enters the pore 28 and the pore 28 is closed. For this reason, since the discharge port of the pressure oil in the stepped opening 22 disappears, the high pressure side pressure oil flows into the stepped opening 22 from the inflow path 12 through the stepped communication hole 32. The internal pressure, that is, the pressure in the stepped opening 22 of the poppet 16 is the same as that of the inflow passage 12 for the high pressure side pressure oil. Then, the poppet 16 moves in the direction of the arrow Y by the elastic force of the spring members 24 and 48, the inclined surface 20 comes into contact with the valve seat 15, and the space between the inclined surface 20 and the valve seat 15 is closed by the O-ring 29. The communication between the path 12 and the outflow path 13 is blocked.

  In this case, the bottom surface of the O-ring groove 30 is provided with a communication hole 31 that communicates with the pores 28 of the poppet 16, the space between the inclined surface 20 and the valve seat 15 is closed, and the high-pressure side pressure oil from the inflow passage 12 is O When acting on the ring 29, the bottom surface of the O-ring groove 30 is held at a pressure lower than the pressure on the surface of the O-ring 29 contacting the valve seat 15, so that the O-ring 29 can be prevented from rising. Therefore, the operating pressure of about 7 MPa can be used for a high pressure of about 10 MPa.

FIG. 3 is an enlarged vertical cross-sectional view of a main part of a check valve 50 according to the second embodiment of the present invention. In FIG. 3, the same components as those in FIG. The detailed explanation is omitted.
The check valve 50 shown in FIG. 3 is characterized in that when the solenoid valve 40 (see FIG. 2) is excited and the pressure oil flowing in from the B port flows from the outflow path 13 to the inflow path 12 and flows out to the A port, the pressure oil Thus, the O-ring 29 is prevented from jumping out of the O-ring groove 30.

  Therefore, a step hole 51 communicating with the pore 28 is provided in the end face of the conical portion 21 of the poppet 16 facing the outflow passage 13 in FIG. 3, and a set screw 52 is screwed into the step hole 51 and the set screw 52 is A ball 53 is provided between one side (left side in FIG. 3) and one side (right side in FIG. 3) of the pore (pilot hole) 28, and the check screw 54 and the ball 53 constitute a check valve 54.

FIG. 4 is a structural diagram of the set screw 52. As shown in FIG. 4A, the set screw 52 is provided with a screw 55 that is screwed into the step hole 51 on the outer peripheral surface, and a communication hole 56 that communicates with the pore 28 at the center.
Further, as shown in FIG. 4 (a), a hexagonal hole 57 is formed in one side (right side in FIG. 4 (a)) in the axial direction up to approximately half of the length of the set screw 52, and the other side (FIG. 4). On the left side in (a), a groove 58 oriented in the diameter direction with respect to the communication hole 57 is formed.
Reference numeral 59 indicates an orifice hole, which communicates the front chamber (the inflow passage 12 side in FIG. 3) and the rear chamber (the spring member 24 side) of the poppet 16.

Next, the operation of the check valve 50 of FIG. 3 accompanying the operation of the solenoid valve 40 of FIG. 2 will be described.
When the solenoid coil 45 is energized and pressure oil flows into the outflow passage 13 from the B port, the pressure oil flows through the communication hole 56 of the check valve 52 and presses the ball 53 against the hole 28, thereby closing the hole 20. The
On the other hand, the poppet 16 moves in the direction of the arrow X in FIG. 3 against the elastic force of the spring member 24 by the pressure oil of the outflow passage 13 acting on the poppet 16, and the sleeve 11, the valve seat 15 and the poppet 16 are moved. Pressure oil flows from the gap with the conical portion 21, and the pressure oil flows from the inflow path 12 to the A port.

Here, when the pressure oil flows from the B port through the outflow channel 13 to the A port from the inflow channel 12,
Since the pores 28 are closed by the check valve 54, the pressure oil in the outflow passage 13 is not acting.
Therefore, the pressure oil in the outflow passage 13 does not act on the escape hole 31 communicating with the O-ring groove 30, so that the O-ring 29 does not jump out of the O-ring groove 30.

1 is a schematic longitudinal sectional view of a check valve according to a first embodiment of the present invention. FIG. 2 is a schematic vertical sectional view of a poppet type solenoid valve assembled with the check valve of FIG. 1. It is a schematic longitudinal cross-sectional view of the solenoid valve with a monitoring switch which concerns on 2nd embodiment of this invention. FIG. 4 is a schematic structural diagram of the set screw of FIG. 3, (a) shows a front view, (b) shows a right side view, and (c) shows a left side view.

DESCRIPTION OF SYMBOLS 10 Check valve 11 Sleeve 12 Inflow path 13 Outflow path 14 Valve chamber 15 Valve seat 16 Poppet 17 Large diameter part 18 Small diameter part 24, 48 Spring member 28 Stepped opening 29 O-ring 30 O-ring groove 31 Relief hole 40 Poppet type Solenoid valve 42 Needle valve 45 Solenoid coil 46 Valve body 47 Plunger 50 Solenoid valve with monitoring switch 51 Step hole 52 Set screw 53 Ball 54 Check valve

Claims (3)

A valve chamber having a fluid inflow path and an outflow path, in which an inner peripheral surface is formed in a cylindrical shape and a valve seat is formed having a diameter reduced toward the outflow path;
A seal member that is capable of opening and closing between the inflow passage and the valve chamber by contacting and separating from the valve seat;
A poppet provided with the sealing member and reciprocating in the valve chamber;
A biasing means having a resilient force to bias the poppet toward the valve seat;
A check valve with
A pressure reducing hole for guiding the pressure of the outflow passage secured at the low pressure side pressure is provided at the bottom of the seal groove for fitting the seal member for fluid-tightening between the valve seat and the seal portion of the poppet. Accordingly, the check valve prevents the seal member from floating from the seal groove when pressure oil passes between the valve seat and the seal portion of the poppet from the inflow path to the outflow path. A valve chamber having a fluid inflow path and an outflow path, in which an inner peripheral surface is formed in a cylindrical shape and a valve seat is formed having a diameter reduced toward the outflow path;
A seal member that is capable of opening and closing between the inflow passage and the valve chamber by contacting and separating from the valve seat;
A poppet provided with the sealing member and reciprocating in the valve chamber;
A biasing means having a resilient force to bias the poppet toward the valve seat;
A check valve with
A pressure-reducing hole that is provided at the bottom of a seal groove for fitting the seal member for liquid-tightening between the valve seat and the seal portion of the poppet and guides the pressure of the outflow passage secured at a low-pressure side pressure; ,
A check valve provided between the decompression hole and the outflow passage and blocking the decompression hole and the outflow passage;
Have
When pressure oil flows from the outflow path to the inflow path, the check valve prevents the pressure oil flowing from the outflow path to the decompression hole and prevents the seal member from floating from the seal groove. Check valve. The check valve according to claim 1 or 2, wherein the check valve is built-in.

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