TWI630337B - Fluid control valve - Google Patents

Abstract

The present invention provides a fluid control valve. The fluid control valve (2) includes a body portion (4), and an inside of an introduction chamber (41) for introducing a fluid from a pressure fluid source and a passage (40) and an introduction chamber ( 41) a connected output chamber (42); a valve member (5) capable of opening and closing the passage (40), and forming a communication portion (50) connecting the introduction chamber (41) and the output chamber (42); and an elastic member ( 6) It is arranged in the communication part (50), and uses its own elastic force to make the communication part (50) closed, and the pressure of the output chamber (42) becomes higher than the introduction chamber (41) and deforms. Thereby, the communication part (50) is changed from the closed state to the open state.

Description

Fluid control valve

The invention relates to a fluid control valve.

A valve (fluid control valve) that regulates the pressure of a fluid such as air and outputs it has been previously known. The fluid control valve is used in, for example, a brake control device for a railway vehicle. Such a fluid control valve has an introduction chamber on the primary side where pressure fluid (compressed air) is introduced from a pressure fluid source, and an output chamber on the secondary side which is connected to the introduction chamber via a passage. The displacement of the valve member in the axial direction results in the opening and closing of the passage. As a result, the pressure in the output chamber is adjusted.

For maintenance and the like, the pressure fluid in the introduction chamber of the primary side of such a fluid control valve may be discharged. However, if the fluid control valve has: the air on the primary side is discharged, the closed state of the passage connecting the introduction chamber and the output chamber is maintained, and other parts of the output chamber are also sealed in this structure, the secondary side The pressure fluid remains in the output chamber. It is not suitable for the operator to perform maintenance such as disassembling the fluid control valve in a state where the pressure fluid remains in the output chamber. If the pressure fluid remains in the output chamber on the secondary side over a long period of time, the components of the fluid control valve continue to be subjected to a load, which may cause deterioration of rubber components, for example.

Patent Document 1 (Japanese Patent Application Laid-Open No. 60-24664) discloses a variable load valve having a supply valve that supplies air corresponding to the pressure of the load of a railway vehicle to a brake device. FIG. 5 of Patent Document 1 discloses a structure in which a supply chamber (introduction chamber) in which a supply valve is arranged and an output chamber are connected by a check valve provided on the side of the supply valve. If the pressure fluid in the supply room is discharged on the primary side, the valve body of the valve member of the check valve overcomes the check. The spring force of the valve leaves the valve seat. As a result, since the output chamber and the supply chamber are connected, the pressure fluid in the output chamber on the secondary side is discharged through the supply chamber on the primary side.

However, since the check valve for discharging the pressure fluid remaining on the secondary side is provided on the side of the supply valve, the technique of Patent Document 1 requires a space for arranging the check valve. Therefore, the technique of Patent Document 1 has a problem that the size of the entire variable load valve is increased. On the other hand, since a check valve must have two components, a valve member and a spring, as a component constituting the check valve, there is also a problem that the number of parts increases.

An object of the present invention is to provide a fluid control valve which can be miniaturized with a small number of parts and is configured to automatically discharge the pressure fluid in the secondary side or the output chamber when the pressure fluid in the primary side or the introduction chamber is discharged. Ground discharge structure.

[Summary of Invention]

The fluid control valve according to the present invention includes a main body portion formed with an introduction chamber into which a fluid is introduced from a pressure fluid source and an output chamber connected to the introduction chamber via a passage; and a valve member capable of opening and closing the passage and forming the passage. There is a communication portion that connects the introduction chamber and the output chamber; and an elastic member is provided in the communication portion. The communication portion is closed using the elastic force of the elastic member, and if the pressure of the output chamber becomes higher than the pressure of the introduction chamber, the elastic member is deformed, so that the communication portion is changed from the closed state. Becomes open.

According to the above-mentioned technology, the structure for automatically discharging the pressure fluid in the output chamber when the pressure fluid in the introduction chamber is discharged can be made compact with a small number of parts.

With the following detailed description and the accompanying drawings, the purpose, features and advantages of the above-mentioned air compression device will be explained more clearly.

2‧‧‧ fluid control valve

4‧‧‧Body

4A‧‧‧Body

4D‧‧‧ Supporting Components

5‧‧‧ Valve components

5A‧‧‧Valve shaft

5B‧‧‧Valve body

6‧‧‧ Elastic member

7‧‧‧ Pistons

7A‧‧‧through hole

9‧‧‧ spring for valve member

11‧‧‧sealing member

12‧‧‧ cylinder components

40‧‧‧ access

40B‧‧‧Valve seat

41‧‧‧Introduction Room

42‧‧‧output room

43‧‧‧Guide

44‧‧‧ Inner room

44A‧‧‧The first inner room

44B‧‧‧The second inner room

45‧‧‧step difference

50‧‧‧Connecting Department

51‧‧‧via hole

52‧‧‧Slot

53‧‧‧through hole

54‧‧‧Groove

55‧‧‧face of valve body 5B

56‧‧‧ opening

57‧‧‧ opening

58‧‧‧Groove

120‧‧‧Connecting Department

A‧‧‧center axis

A1‧‧‧face

A2‧‧‧face

G‧‧‧ Clearance

S1‧‧‧Distance

S2‧‧‧Distance

θ1‧‧‧ Angle of the extending direction of the via hole with respect to a plane orthogonal to the central axis A

θ2‧‧‧ Opening angles of opposite faces A1, A2

Fig. 1 is a sectional view showing a fluid control valve according to an embodiment of the present invention.

Fig. 2 is a sectional view showing a valve member of a fluid control valve.

FIG. 3 (A) is a schematic view showing an example of the arrangement of the communication portion provided on the valve member; and FIGS. 3 (B) to 3 (E) are schematic views showing other examples of the arrangement of the communication portion provided on the valve member.

Fig. 4 (A) is a plan view showing an elastic member in a fluid control valve; Fig. 4 (B) is a sectional view taken along line IV-IV in Fig. 4 (A), showing an example of a cross-sectional shape of the elastic member; Fig. 4 ( C) Another example showing the cross-sectional shape of the elastic member.

5 (A) ~ 5 (C) are sectional views showing a state where the elastic member shown in Fig. 4 (B) is mounted on a valve member; Figs. 5 (D) ~ 5 (F) are views showing Fig. 4 (C) A cross-sectional view showing a state where the elastic member is mounted on the valve member.

6 (A) to 6 (G) are sectional views showing a modification example of the elastic member.

7 (A) to 7 (C) are cross-sectional views showing an example of the arrangement of the communication portion.

8 (A) to 8 (C) are cross-sectional views showing an example of the arrangement of the communication portion.

9 (A) and 9 (B) are cross-sectional views showing an example of the arrangement of the communication portion.

Fig. 10 is a sectional view showing a modification example of the valve member.

11 (A) and 11 (B) are sectional views showing a modification example of the valve member.

[Detailed description]

The form for implementing this invention is demonstrated in detail, referring drawings. The fluid control valve 2 according to the embodiment of the present invention is used in, for example, a railway vehicle. The fluid control valve 2 according to this embodiment is used for, for example, a brake control device or the like. The brake control device is used to adjust the brake pressure supplied to the brake cylinder not shown in the figure. However, the fluid control valve 2 according to this embodiment is not limited to these applications, and may be used for other applications in which the pressure of a pressurized fluid such as compressed air is used to control the operation of railway vehicles and the like.

[Overall Structure of Flow Control Valve]

FIG. 1 is a cross-sectional view showing an exemplary fluid control valve 2. As shown in FIG. 1, the fluid control valve 2 includes a body portion 4A, a valve member 5, an elastic member 6, a piston 7, and a valve member. The spring 9 and the cylinder member 12. A space is formed inside the main body portion 4A. By disposing the valve member 5, the piston 7, the cylinder member 12, and the like in the space, the space is divided into a plurality of spaces. The plurality of spaces include an introduction chamber 41 and an output chamber 42.

A passage 40 connecting the introduction chamber 41 and the output chamber 42 is provided at a boundary portion between the introduction chamber 41 and the output chamber 42. In the present embodiment, the passage 40 is, for example, a circular opening in a boundary portion between the introduction chamber 41 and the output chamber 42. As shown in FIG. 1, the passage 40 is defined by a valve seat 40B formed by a part of the main body portion 4A.

As shown in FIG. 1, the cylinder member 12 is provided so as to seal one end portion of a space formed inside the main body portion 4A. The cylinder member 12 has a cylindrical shape in which one end portion (upper end portion) is closed and the other end portion (lower end portion) is opened. In the hollow portion of the cylinder member 12, a valve member 5 is inserted through the opening at the other end.

The valve member 5 is variably supported in the axial direction by the cylinder member 12. The displacement direction of the valve member 5 is the direction of the central axis A (the axial direction of the valve member 5) shown in FIG. The valve member 5 can open and close the passage 40 by being displaced in the axial direction. Specifically, the valve member 5 includes a valve shaft 5A inserted into a hollow portion of the cylinder member 12 and a valve body 5B closer to the passage 40 side than the valve shaft 5A and adjacent to the valve shaft 5A. The valve body 5B has a larger outer diameter than the valve shaft 5A. The valve shaft 5A is displaced in the axial direction while being guided by a guide portion 43 constituted by the inner peripheral surface of the cylinder member 12.

The hollow portion of the cylinder member 12 includes a hollow portion in the upper portion and a hollow portion in the lower portion having an inner diameter larger than the hollow portion in the upper portion. A valve shaft 5A of the valve member 5 is arranged in the upper hollow portion. A valve body 5B of the valve member 5 is arranged in the lower hollow portion.

As shown in FIGS. 1 and 2, a groove 58 is formed on the outer peripheral surface of the valve shaft 5A. A pressing member 11 is disposed in the groove 58. As a result, the sealing performance (airtightness) between the introduction chamber 41 and the output chamber 42 is improved. In the present embodiment, the groove 58 is provided in an annular shape on the outer peripheral surface of the valve shaft 5A so as to be continuous in the circumferential direction. A ring-shaped pressing member such as an O-ring can be used as the pressing member 11. Alternatively, other components may be used as the pressing member 11. The principle of this embodiment is not limited to a specific member used as the pressing member 11.

The spring 9 for the valve member applies a force to the valve member 5 in a direction in which the passage 40 is closed. In this embodiment, the force necessary for the spring 9 for the valve member is suppressed as small as possible so that the valve member 5 is positioned on one side (closed side) and the other side (opened side) of the valve member 5 in the axial direction. The surface area of each part of the valve member 5 is designed in such a manner that the applied air pressure is balanced.

When the force with which the piston 7 presses the valve member 5 is greater than the force toward the closing side (including the force of the spring 9 for the valve member), the valve member 5 moves in a direction to open the passage 40. When the force toward the closing side (including the force of the spring 9 for the valve member) is greater than the pressing force applied by the piston 7, the valve member 5 maintains the passage 40 in the closed state.

In a closed state where the introduction chamber 41 and the output chamber 42 are not connected, the end face 55 of the valve body 5B abuts against the valve seat 40B. In an open state where the introduction chamber 41 and the output chamber 42 are in communication, the end face 55 of the valve body 5B is separated from the valve seat 40B. The diameter of the end face 55 of the valve body 5B is larger than the inner diameter of the opening of the passage 40.

The introduction chamber 41 is a space where a pressurized fluid (compressed air in this embodiment) is supplied from a pressurized fluid source (not shown). This pressure fluid flows into the introduction chamber 41 from a pressure fluid source. As shown in FIG. 1, the introduction chamber 41 is provided so as to surround the periphery of the valve member 5 and the cylinder member 12.

The output chamber 42 is a space connected to the introduction chamber 41 via a passage 40. The passage 40 opens and closes with the displacement of the valve member 5. When the passage 40 is in an open state, the pressure fluid of the introduction chamber 41 flows into the output chamber 42. On the other hand, when the passage 40 is in a closed state, the inflow of the pressure fluid of the introduction chamber 41 into the output chamber 42 is prevented. The pressure of the pressure fluid in the output chamber 42 is adjusted by opening and closing the control passage 40. The pressure-controlled fluid is supplied to, for example, a brake cylinder (not shown) of the brake control device.

The pressure of the pressure fluid in the output chamber 42 is smaller than a specific range, and the passage 40 is opened. At this time, since the pressure fluid of the introduction chamber 41 flows into the output chamber 42, the pressure of the output chamber 42 increases. The pressure of the pressure fluid in the output chamber 42 is greater than a specific range When it is large, a part of the pressurized fluid in the output chamber 42 is discharged through a discharge path (not shown). As a result, the pressure in the output chamber 42 is reduced.

The piston 7 is supported on the main body portion 4A so as to be displaceable in the axial direction via a support member 4D. The valve member 5 operates in accordance with the displacement of the piston 7. The piston 7 extends in a direction parallel to the axial direction of the valve member 5. In this embodiment, the central axis A of the valve member 5 and the central axis A of the piston 7 coincide. Alternatively, the central axis of the valve member may be offset from the central axis of the piston. One end portion (the upper end portion in FIG. 1) of the piston 7 abuts or approaches the end surface 55 of the valve body 5B of the valve member 5.

As shown in FIG. 1, in the upper end portion of the piston 7, a recessed recessed portion is formed in a direction away from the valve member 5. A through-hole 7A is formed in a wall defining the recess. As a result, the pressure in the concave portion of the piston 7 becomes equal to the pressure around the front end portion of the piston 7.

A spring for the piston, which is omitted in the drawing, applies a force to the piston 7 in a direction away from the valve member 5. When the passage 40 is in the closed state, the piston 7 is stopped at a position where the valve member 5 is not pressed by the spring force of the piston. When the passage 40 is opened, the piston 7 is pushed to the valve member 5 side by the pressure fluid for the piston supplied through the passage omitted in the drawing. As a result, the piston 7 moves toward the valve member 5 side, and a pressing force is applied to the valve member 5 to displace the valve member 5. As a result, the path 40 is switched from the closed state to the open state. When the pressure fluid for the piston is discharged through the passage, for example, the passage 40 is switched from the open state to the closed state.

[Secondary fluid discharge structure of fluid control valve]

The discharge structure of the pressure fluid (secondary fluid) in the output chamber 42 of the fluid control valve 2 will be specifically described. As shown in FIG. 1, the fluid control valve 2 can discharge the secondary side fluid with a smaller number of components than when a check valve having a valve member and a spring is used (see Patent Document 1). structure.

As shown in FIG. 1, the valve member 5 of the fluid control valve 2 includes a communication portion 50 that communicates the introduction chamber 41 and the output chamber 42. The elastic member 6 has a function of switching an open state and a closed state of the communication portion 50.

The valve member 5 is provided in the introduction chamber 41 on the primary side and the output chamber 42 on the secondary side through the valve member. One part of 5 and adjacent positions. Specifically, as shown in FIGS. 1 and 2, the valve member 5 of the present embodiment is provided with a through hole 53 penetrating the axial direction (the direction of the central axis A). A part of the output chamber 42 (the inner chamber 44 of the output chamber 42) is constituted by the space partitioned by the inner peripheral surface in the through hole 53. An introduction chamber 41 is provided around the valve member 5. That is, the outside (radially outward) of the valve member 5 of this embodiment is the primary-side introduction chamber 41, and the inside (radially inner) of the valve member 5 is the secondary-side output chamber 42. The peripheral wall of the valve member 5 separates the primary side from the secondary side, and the primary side is adjacent to the secondary side via the peripheral wall of the valve member 5. In this embodiment, the communication portion 50 is formed by a structure in which the primary side and the secondary side are adjacent to each other via the peripheral wall of the valve member 5. The communication portion 50 penetrates the peripheral wall of the valve member 5.

The elastic member 6 is provided in the communication portion 50. The elastic member 6 is configured to close the communication portion 50 by using the elastic force (contraction force) of the elastic member 6. Therefore, when there is no pressure difference between the introduction chamber 41 and the output chamber 42, and when the pressure of the introduction chamber 41 is higher than that of the output chamber 42, the elastic member 6 can maintain the communication portion 50 in a closed state. On the other hand, if the pressure of the output chamber 42 becomes higher than that of the introduction chamber 41 and the differential pressure between these spaces resists the elastic force of the elastic member 6 and elastically deforms the elastic member 6, it is in the introduction chamber A gap G is formed between the opening of the communication portion 50 on the 41 side and the elastic member 6 (see FIG. 5 (C) and / or FIG. 5 (F)). At this time, the communication section 50 is switched from the closed state to the open state. As a result, the pressure fluid remaining in the output chamber 42 is guided to the introduction chamber 41 side and discharged from the output chamber 42.

The above description is the main feature of the secondary side fluid discharge structure of the fluid control valve 2. The communication unit 50 and the elastic member 6 which are the main parts of the discharge structure will be specifically described below.

〔Connecting section〕

As shown in FIGS. 1 and 2, the communication portion 50 includes a via hole 51 and a slot 52. The passage hole 51 extends from the output chamber 42 toward the introduction chamber 41. The passage hole 51 penetrates the valve member 5. The slot 52 is a groove-shaped portion formed in the circumferential direction on the outer peripheral surface of the valve member 5. The slot 52 is opened in the introduction chamber 41. The via hole 51 is connected to the slot 52 and opens in the output chamber 42.

The opening (opening of the slot 52) of the communication portion 50 on the introduction chamber 41 side is provided in the valve member 5. The outer peripheral surface of the valve shaft 5A. The passage hole 51 extends from the slot 52 to the inside (the center axis A side) of the valve member 5. The opening of the communication portion 50 (the opening of the passage hole 51) on the output chamber 42 side is provided on the inner peripheral surface of the inner chamber 44 of the valve member 5. At this time, as in the modified examples shown in FIG. 8 (C) and FIG. 9 (A) described later, compared with the case where the opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve body 5B, communication The section 50 becomes shorter.

As shown in FIG. 2, the passage hole 51 extends linearly from the introduction chamber 41 side to the output chamber 42. Alternatively, the via hole 51 may have a curved portion as shown in FIG. 7 (A) described later, for example.

In the embodiment shown in FIG. 2, the communication portion 50 includes a plurality of via holes 51. The plurality of passage holes 51 extend from the inner chamber 44 (through-hole 53 provided in the valve member 5) constituting a part of the output chamber 42 provided in the valve member 5 to the outside (in a direction away from the central axis A). FIG. 3 (A) is a schematic view showing an arrangement example of the communication portion 50 provided in the valve member 5. Regarding the arrangement example shown in FIG. 3 (A), the communication portion 50 has six passage holes 51. Alternatively, the communication unit 50 may be configured as another arrangement example shown in FIGS. 3 (B) to 3 (E). With reference to FIGS. 3 (A) to 3 (D), the communication portion 50 includes a plurality of via holes 51. Alternatively, the communication portion 50 may have only a single via hole 51 as in the arrangement example shown in FIG. 3 (E).

Regarding the arrangement examples shown in Figs. 3 (A) to 3 (C), the plurality of passage holes 51 are provided at symmetrical positions when the valve member 5 is viewed from the axial direction. Specifically, as shown in FIG. 3 (A) to FIG. 3 (C), the plurality of passage holes 51 are arranged in a rotationally symmetrical manner with the central axis A as the axis of symmetry. However, as shown in FIG. 3 (D), the plurality of via holes 51 may be disposed at positions asymmetric with respect to the central axis A.

As shown in FIG. 2, the passage hole 51 extends in a direction inclined with respect to the axial direction (central axis A) of the valve member 5 (a direction inclined with respect to a plane orthogonal to the axial direction). As shown in FIG. 2, the extending direction of the passage hole 51 is inclined so that the angle with respect to a plane orthogonal to the central axis A of the valve member 5 is θ1. The angle θ1 is an acute angle. Regarding the form shown in FIG. 2, the passage hole 51 is inclined so that the opening of the passage hole 51 on the output chamber 42 side is closer to the end face 55 of the valve body 5B than the opening of the passage hole 51 on the introduction chamber 41 side. With such an inclined structure, The following advantages.

As shown in FIG. 2, the inner chamber 44 of the output chamber 42 includes a first inner chamber 44A and a second inner chamber 44B adjacent to the first inner chamber 44A in the axial direction via the step portion 45. The second inner chamber 44B has an inner diameter larger than that of the first inner chamber 44A. Since the via hole 51 in this embodiment has the inclined structure as described above, the end portion (opening) of the via hole 51 on the inner chamber 44 side is positioned more than the end portion (opening) of the via hole 51 on the introduction chamber 41 side. The position is further away from the step portion 45 in the axial direction. This configuration is, for example, a variation shown in FIG. 7 (B) described later. When the passage hole 51 extends in a direction orthogonal to the axial direction, a valve constituting a portion between the step portion 45 and the passage hole 51 is formed. The thickness of the member 5 is not easily reduced. Therefore, the strength of the portion between the step portion 45 and the via hole 51 is not excessively small.

The passage hole 51 can be inclined closer to the end face 55 of the valve body 5B than the opening of the passage hole 51 on the output chamber 42 side. The passage hole 51 may extend in a direction orthogonal to the axial direction of the valve member 5 like the modified examples shown in FIGS. 7 (B), 8 (A) to 8 (C), and 9 (A) described later. . The passage hole 51 may extend in a direction parallel to the axial direction of the valve member 5 as shown in FIGS. 7 (C) and 9 (B) described later.

The total cross-sectional area of the plurality of passage holes 51 is equal to or less than the cross-sectional area from the opening portion 56 of the inner chamber 44 on the valve body 5B side to the narrowest portion between the passage holes 51 and from the inner chamber 44 on the valve shaft 5A side The cross-sectional area of the narrowest portion between the opening portion 57 and the via hole 51 is equal to or less than. At this time, each via hole 51 is effectively used without waste. Since the designer can set only the required passage holes 51, the strength of the valve member 5 will not be too small.

The slot 52 is formed in a cross section including the central axis A of the valve member 5 as shown in FIG. 2 so that the height (width) becomes higher as it goes from the inside to the outside of the valve member 5. Regarding the form shown in FIG. 2, the angle θ2 formed by the facing surfaces A1 and A2 of one of the slots 52 is an acute angle larger than 0 degrees. Therefore, when the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, when the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 side, between the slot 52 and the elastic member 6 It is easy to form the gap G early (see FIG. 5 (C)). The result is The pressure fluid remaining in the output chamber 42 is discharged early to the introduction chamber 41 side.

In this embodiment, an end portion of the slot 52 on the side of the via hole 51 has a curved surface (for example, a curved surface having a substantially C-shaped cross section) so as to be smoothly connected to the via hole 51. Therefore, the slot 52 of the present embodiment has a curved surface on the side of the via hole 51 and an opposite surface A1, A2 connected to the curved surface. In FIG. 2, the distance (axial distance) between the facing surfaces A1 and A2 at the boundary portion between the curved surface and the pair of facing surfaces A1 and A2 is indicated by an arrow S1. FIG. 2 shows the distance (the axial distance) between the facing surfaces A1 and A2 of the opening of the slot 52 with an arrow S2. In this embodiment, the distance S2 is larger than the distance S1.

As shown in FIG. 10 to be described later, one of the opposing surfaces A1 and A2 of the slot 52 may be parallel to each other. Alternatively, the pair of facing surfaces A1 and A2 may be formed such that the height of the slot becomes lower as it goes from the inside to the outside of the valve member 5.

The pair of facing surfaces A1 and A2 that define the height of the slot 52 in this embodiment each extend linearly in a section including the central axis A of the valve member 5. In this case, the design of the slot 52 and the process of forming the slot 52 become easy. One of the facing surfaces A1 is parallel to a plane orthogonal to the axial direction of the valve member 5. Since processing of such parallel surfaces is particularly easy, processing of the entire slot 52 is also facilitated.

One or both of the opposing surfaces A1 and A2 of one of the slots 52 may be curved, instead of being linear.

As shown in FIG. 1, the slot 52 of this embodiment is provided on the inner peripheral surface of the cylinder member 12 that is not guided by the valve shaft 5A (the inner periphery of the upper hollow portion with a smaller inner diameter in the hollow portion of the cylinder member 12 Surface) is the position where the guide 43 guides. That is, the slot 52 is provided at a position deviated from the guide member 43 in the axial direction of the valve member 5 by a length greater than the distance that the valve member 5 is displaced in the axial direction. As a result, since the elastic member 6 does not interfere with the guide portion 43 when the valve member 5 is displaced, the smoothness of the displacement of the valve member 5 is maintained.

[Elastic member]

FIG. 4 (A) is a plan view showing the elastic member 6 of the fluid control valve 2. Figure 4 (B) 4 (A) is a cross-sectional view taken along the line IV-IV, showing an example of a cross-sectional shape of the elastic member 6. The elastic member 6 is formed in a ring shape (specifically, a ring shape) and is arranged in the slot 52. Since the elastic member 6 arranged in the slot 52 is contracted in the circumferential direction, the elastic member 6 can apply a force to the direction of the central axis A side of the valve member 5 with respect to the slot 52.

Since the elastic force (contraction force) of the elastic member 6 acts on the direction in which the communication portion 50 is closed relative to the elastic member 6, when there is no pressure difference between the introduction chamber 41 and the output chamber 42 and between the introduction chamber 41 and When the pressure is higher than the pressure of the output chamber 42, the communication portion 50 is maintained in a closed state. On the other hand, when the pressure of the output chamber 42 becomes higher than that of the introduction chamber 41, the elastic member 6 is elastically deformed to switch the communication portion 50 from the closed state to the open state. Therefore, the pressure fluid remaining in the output chamber 42 is guided to the introduction chamber 41 side and is discharged from the output chamber 42.

As shown in FIGS. 1 and 4 (A), in this embodiment, since the slot 52 and the elastic member 6 are both formed in a ring shape, the elastic member 6 can be used only by disposing the elastic member 6 in the slot 52. The elastic force (contraction force) closes the communication portion 50. Since the elastic member 6 is arranged in the slot 52, the positional deviation of the elastic member 6 is less likely to occur.

The cross section orthogonal to the circumferential direction of the elastic member 6 shown in FIG. 4 (B) has a circular shape. Alternatively, the elastic member 6 may have an oval shape as shown in FIG. 4 (C). In these cases, when the elastic member 6 is elastically deformed in such a manner as to extend toward the introduction chamber 41 and then recovered in a manner of contracting toward the output chamber 42, even if a part of the elastic member 6 is distorted, the cross section of the elastic member 6 Since the shape is a circular shape or an elliptical shape, it is difficult to reduce the sealing function for keeping the communication portion 50 in a closed state.

6 (A) to 6 (G) are cross-sectional views showing various elastic members 6. The cross-sectional shape of the elastic member 6 in FIG. 6 (A) is circular. The cross-sectional shape of the elastic member 6 in FIG. 6 (B) is a polygon (specifically, a quadrangle). The cross-sectional shape of the elastic member 6 in FIG. 6 (C) is substantially D-shaped. The cross-sectional shape of the elastic member 6 in FIG. 6 (D) is substantially X-shaped. The cross-sectional shape of the elastic member 6 in FIG. 6 (E) is substantially C-shaped (approximately V-shaped). The sectional shape of the elastic member 6 in FIG. 6 (F) is approximately L shape. The cross-sectional shape of the elastic member 6 in FIG. 6 (G) is approximately S-shaped.

The elastic member 6 of this embodiment is composed of a member having the same specifications as the pressing member 11 (see FIG. 1). As described above, in order to improve the sealing performance between the introduction chamber 41 and the output chamber 42, the pressing member 11 is arranged on the groove 58 formed on the outer peripheral surface of the valve shaft 5A. In this way, since the elastic member 6 and the pressing member 11 are members of the same specification, there is no difference in assembly of the pressing member 11 and the elastic member 6 during manufacture. In addition, the manufacturing cost of the fluid control valve 2 can be suppressed to a low level.

Examples of the material constituting the elastic member 6 include synthetic resins and metals. From the standpoint of tightness, etc., it is preferable that a synthetic resin can be used as the material of the elastic member 6. Examples of the synthetic resin include natural rubber, chloroprene rubber, acrylonitrile butadiene rubber, ethylene propylene rubber, isobutylene isoprene rubber, chlorosulfonated polyethylene rubber, styrene butadiene rubber, and butadiene rubber. , Silicone rubber, fluorine rubber, polyurethane rubber and fluorine resin. Examples of the fluororesin include polytetrafluoroethylene.

〔action〕

5 (A) to 5 (C) are cross-sectional views showing a state in which the elastic member 6 (the elastic member 6 having a circular cross section) is installed in the valve member 5 shown in FIG. 4 (B). 5 (A) and 5 (B) show that when there is no pressure difference between the introduction chamber 41 and the output chamber 42, and when the pressure of the introduction chamber 41 is higher than the pressure of the output chamber 42, the communication portion 50 is passed through the elastic member 6. When it becomes closed. FIG. 5 (C) shows a case where the pressure of the output chamber 42 is higher than the pressure of the introduction chamber 41, and the elastic member 6 is elastically deformed to make the communication portion 50 open.

When both of the elastic members 6 shown in FIGS. 5 (A) and 5 (B) are arranged in the slot 52, the slot 52 faces the slot 52 in a direction toward the center axis A side of the valve member 5 by contracting in the circumferential direction. Designed to apply force. The shrinking force of the elastic member 6 shown in FIG. 5 (B) is larger than that of the elastic member 6 shown in FIG. 5 (A). As a result, compared with the elastic member 6 shown in FIG. 5 (A), the elastic member 6 shown in FIG. 5 (B) has a greater degree of flat elastic deformation in the slot 52 and enters the passage hole 51 side more. Therefore, it is possible to improve the sealing performance of the communication portion 50 in a closed state.

For example, when the operator discharges the pressure fluid in the primary introduction chamber 41 for maintenance or the like, even if the passage 40 is closed by the valve member 5, the pressure difference between the introduction chamber 41 and the output chamber 42 makes the elastic member 6 also As shown in FIG. 5 (C), elastic deformation occurs, and a gap G is formed between the elastic member 6 and the inner surface (opposing surface A1 or opposing surface A2) of the slot 52. As a result, the communication portion 50 is opened, and the pressure fluid remaining in the output chamber 42 is guided to the introduction chamber 41 side and discharged from the output chamber 42.

5 (D) to 5 (F) are cross-sectional views showing a state where the elastic member 6 (the elastic member 6 having an elliptical shape in cross section) is installed in the valve member 5 as shown in FIG. 4 (C). Since FIGS. 5 (D) to 5 (F) correspond to the above-mentioned diagrams of FIGS. 5 (A) to 5 (C), detailed descriptions are omitted and only differences are described.

5 (D) and 5 (E) show that when there is no pressure difference between the introduction chamber 41 and the output chamber 42, and when the pressure of the introduction chamber 41 is higher than the pressure of the output chamber 42, the communication portion 50 is elastic. When the member 6 is in a closed state. FIG. 5 (F) shows a case where the pressure of the output chamber 42 is higher than the pressure of the introduction chamber 41, and the elastic member 6 is elastically deformed to make the communication portion 50 open.

The elastic member 6 shown in FIGS. 5 (D) to 5 (F) has an oval shape. If the oval-shaped elastic member 6 is arranged to adjust the major axis direction of the ellipse so as to follow the shape of the slot 52, the elastic member 6 can be easily attached to the space of the slot 52 compared with the circular-shaped elastic member. Improve tightness.

[Summary of Implementation Forms]

As described above, the elastic member 6 according to this embodiment is configured so that the communication portion 50 is closed by utilizing the elastic force of the elastic member 6. When there is no pressure difference between the introduction chamber 41 and the output chamber 42 and the introduction chamber When the pressure of 41 is higher than the pressure of the output chamber 42, the communication portion 50 is maintained in a closed state. On the other hand, when the pressure of the output chamber 42 becomes higher than that of the introduction chamber 41, the elastic member 6 is elastically deformed to switch the communication portion 50 from the closed state to the open state. As a result, the pressure fluid remaining in the output chamber 42 is guided to the introduction. It is discharged from the output chamber 42 on the side of the chamber 41. As described above, in this embodiment, for example, when the operator discharges the pressure fluid in the primary introduction chamber 41 for maintenance or the like, even if the passage 40 is closed by the valve member 5, the elastic member 6 can use the introduction chamber. The pressure difference between 41 and the output chamber 42 causes elastic deformation. As a result, since the communication portion 50 is opened, the pressure fluid remaining in the output chamber 42 is guided to the introduction chamber 41 side and discharged from the output chamber 42. Therefore, in the present embodiment, the structure for automatically discharging the pressure fluid in the output chamber 42 when the pressure fluid in the introduction chamber 41 is discharged, and the valve member 5 and the spring check valve that must be provided as in the conventional use Compared with the case, it can be made compact with a small number of parts.

In this embodiment, the communication portion 50 includes a passage hole 51 provided so as to extend from the introduction chamber 41 toward the output chamber 42. In this configuration, the communication portion 50 can be easily provided on the valve member 5 by a simple process of forming a hole in the valve member 5.

In this embodiment, the introduction chamber 41 is provided around the valve member 5. The communication portion 50 includes a slot 52 formed in the circumferential direction on the outer peripheral surface of the valve member 5. The slot 52 is opened in the introduction chamber 41. The via hole 51 is connected to the slot 52 and opens in the output chamber 42. The elastic member 6 is formed in a ring shape and is arranged in the slot 52.

In this configuration, the annular elastic member 6 is disposed only in the slot 52 formed in the circumferential direction, and the communication portion 50 is closed by the elastic force of the elastic member 6. Since the elastic member 6 is arranged in the slot 52, the positional deviation of the elastic member 6 can be suppressed. These functions can be realized by a simple structure.

The fluid control valve 2 of this embodiment includes a guide portion 43 that guides a part of the valve member 5 when the valve member 5 is displaced. The slot 52 is provided at a position where it is not guided by the guide portion 43. In this configuration, since the elastic member 6 does not interfere with the guide portion 43 when the valve member 5 is displaced, the smoothness of the displacement of the valve member 5 is maintained. Further, in this configuration, the shape of the slot 52 is not easily restricted, and the degree of freedom in designing the slot 52 can be increased.

In the present embodiment, a pressing member 11 is provided between the valve member 5 and the guide portion 43. The elastic member 6 is composed of a member having the same specifications as the pressing member 11. In this configuration, since the Since the elastic member 6 having the same specifications as the pressing member 11 is used, it is not easy to produce an assembly difference between the pressing member 11 and the elastic member 6 during manufacture. In addition, the manufacturing cost of the fluid control valve 2 can be suppressed to a low level.

In this embodiment, in a cross section parallel to the axial direction of the valve member 5, the slot 52 is formed so that its height becomes higher as it goes from the inside to the outside of the valve member 5. In this configuration, the slot 52 is formed so that its height becomes higher as it goes from the inside to the outside of the valve member 5. Therefore, when the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, the elasticity is high. The member 6 is elastically deformed so as to extend toward the introduction chamber 41 side. At this time, a gap G is easily formed early between the slot 52 and the elastic member 6. Therefore, the pressure fluid remaining in the output chamber 42 is discharged early to the introduction chamber 41 side.

If the angle θ2 (opening angle) of one of the slots 52 facing the opposing surfaces A1 and A2 becomes too large, the sealing performance may be reduced. If the angle θ2 is too small, the force with which the elastic member 6 is fastened by the slot 52 increases, and the elastic deformation of the elastic member 6 may not easily occur. Therefore, in view of these problems, the opening angle θ2 is set.

In the present embodiment, in a cross section parallel to the axial direction of the valve member 5, a pair of facing surfaces A1, A2 that define the height of the slot 52 each extend linearly. In this case, the design of the slot 52 and the process of forming the slot 52 become easy.

In this embodiment, one of the pair of facing surfaces A1 and A2 is a surface parallel to a cross section orthogonal to the axial direction of the valve member 5. Since processing of such parallel surfaces is particularly easy, processing of the entire slot 52 is also facilitated.

In this embodiment, the cross section of the elastic member 6 has a circular shape or an oval shape in a direction orthogonal to the circumferential direction of the annular elastic member 6. In this configuration, when the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 side, and is restored to retract toward the output chamber 42 side, even if a part of the elastic member 6 is distorted, the cross section of the elastic member 6 Since the shape is a circular shape or an elliptical shape, it is difficult to reduce the sealing function for keeping the communication portion 50 in a closed state.

In this embodiment, the communication portion 50 includes a plurality of via holes 51. In this configuration, since the communication portion 50 has a plurality of passage holes 51, the area of the passage that guides the pressure fluid remaining in the output chamber 42 to the introduction chamber 41 increases. Therefore, the pressure fluid can be quickly discharged.

The plurality of passage holes 51 in the present embodiment are provided at symmetrical positions when the valve member 5 is viewed from the axial direction. In this configuration, for example, when a part of the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 side, the distance between the deformed portion of the elastic member 6 and the passage hole 51 does not become excessively long. Therefore, a path for guiding the pressure fluid remaining in the output chamber 42 to the introduction chamber 41 can be formed early.

The output chamber 42 in this embodiment includes an inner chamber 44 provided inside the valve member 5. The total cross-sectional area of the plurality of via holes 51 is equal to or smaller than the cross-sectional area of the inner chamber 44 from the opening of the inner chamber 44 to the narrowest portion of the via hole 51. In this configuration, each via hole 51 is effectively used without waste. Since the designer can set only the required passage holes 51, the strength of the valve member 5 will not be too small.

The inner chamber 44 of the output chamber 42 in this embodiment includes a first inner chamber 44A and a second inner chamber 44B which is adjacent to the first inner chamber 44A in the axial direction via the step portion 45. The inner diameter of the second inner chamber 44B is larger than the inner diameter of the first inner chamber 44A. The passage hole 51 extends from the introduction chamber 41 side in such a manner that the position of the end portion of the passage hole 51 on the inner chamber 44 side is further away from the stepped portion 45 in the axial direction than the position of the end portion of the passage hole 51 on the introduction chamber 41 side. To the first inner chamber 44A. In this configuration, the passage hole 51 extends from the introduction chamber 41 side to the first inner chamber 44A so that the relative step portion 45 is axially spaced away from each other. Therefore, the valve constituting a portion between the step portion 45 and the passage hole 51 is configured. The thickness of the member 5 does not become too thin. Therefore, the strength of the portion between the step portion 45 and the via hole 51 is not excessively small.

The passage hole 51 of this embodiment extends linearly from the introduction chamber 41 side to the output chamber 42. In this case, the process of forming the via hole 51 becomes easy.

(Modification)

The principle of the present invention is not limited to those described in the above embodiments, and various changes, improvements, and the like can be made without departing from the spirit thereof. 7 (A) to 9 (B) are sectional views showing an example of the arrangement of the communication portion 50. FIG. 10 is a sectional view showing a modified example of the valve member 5. 11 (A) and 11 (B) are sectional views showing a modification example of the valve member 5.

The communication portion 50 shown in FIG. 7 (A) includes a via hole 51 and a slot 52. The via hole 51 does not have a straight line shape as shown in FIG. 1 but has a curved portion. The via hole 51 shown in FIG. 7 (A) is integrally bent. Alternatively, the via hole 51 may have a structure in which a linearly extending portion and a curvedly extending portion are combined. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. The opening of the communication portion 50 on the output chamber 42 side is provided on the inner peripheral surface of the through hole 53 provided in the valve member 5 (specifically, the inner peripheral surface of the first inner chamber 44A).

The communication portion 50 shown in FIG. 7 (B) includes a via hole 51 and a slot 52. The passage hole 51 extends in a direction orthogonal to the axial direction (the central axis A) of the valve member 5. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. The opening of the communication portion 50 on the output chamber 42 side is provided on the inner peripheral surface of the through hole 53 of the valve member 5 (specifically, the inner peripheral surface of the partitioned first inner chamber 44A).

The communication portion 50 shown in FIG. 7 (C) includes a via hole 51 and a slot 52. The passage hole 51 extends in a direction parallel to the axial direction of the valve member 5. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. An opening of the communication portion 50 on the output chamber 42 side is provided on an end face 55 of the valve body 5B of the valve member 5.

The communication portion 50 shown in FIG. 8 (A) includes a via hole 51 and a slot 52. The passage hole 51 extends in a direction orthogonal to the axial direction (the central axis A) of the valve member 5. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. The opening of the communication portion 50 on the output chamber 42 side is provided on the inner peripheral surface of the through hole 53 of the valve member 5 (specifically, the inner peripheral surface of the second inner chamber 44B is divided).

The communication portion 50 shown in FIG. 8 (B) has a via hole 51 instead of a slot 52. Via hole 51 extends in a direction orthogonal to the axial direction (central axis A) of the valve member 5. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. The opening of the communication portion 50 on the output chamber 42 side is provided on the inner peripheral surface of the through hole 53 of the valve member 5 (specifically, the inner peripheral surface of the partitioned first inner chamber 44A).

The communication portion 50 shown in FIG. 8 (C) has a via hole 51 instead of a slot 52. The passage hole 51 extends in a direction orthogonal to the axial direction (the central axis A) of the valve member 5. As shown in FIG. 8 (C), the cylinder member 12 provided so as to surround the valve body 5B of the valve member 5 is provided with a communication portion 120 that communicates with the communication portion 50 of the valve member 5. The elastic member 6 closes the communication portion 120 of the cylinder member 12 and closes the communication portion 50 of the valve member 5.

The communication portion 50 shown in FIG. 9 (A) has a via hole 51 instead of a slot 52. The passage hole 51 extends in a direction orthogonal to the axial direction (the central axis A) of the valve member 5. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve body 5B of the valve member 5. The opening of the communication portion 50 on the output chamber 42 side is provided on the inner peripheral surface of the through hole 53 of the valve member 5 (specifically, the inner peripheral surface of the partitioned first inner chamber 44A).

The communication portion 50 shown in FIG. 9 (B) has a groove 54 but no via hole 51 and a slot 52. The groove 54 extends in a direction parallel to the axial direction of the valve member 5. The opening of the communication portion 50 (the groove 54) on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. The opening of the communication portion 50 (the groove 54) on the output chamber 42 side is provided at an end portion above the valve shaft 5A of the valve member 5 (the end portion of the valve shaft 5A opposite to the valve body 5B). As shown in FIG. 9 (B), the groove 54 is formed by a groove provided on the outer peripheral surface of the valve member 5. The number of the grooves 54 may be plural or one.

The valve member 5 shown in FIG. 10 is different from the valve member 5 shown in FIG. 2 in one point, that is, the height (width) of the slot 52 is substantially constant. The angle formed by the facing surfaces A1 and A2 of one of the slots 52 of the valve member 5 shown in FIG. 10 is approximately zero.

The valve member 5 shown in FIG. 11 (A) differs from the embodiment shown in FIG. 1 in the structure and arrangement of the communication portion 50 and the elastic member 6. The communication portion 50 shown in FIG. 11 (A) has a through valve member 5 的 通 孔 51。 5 of the via hole 51. The opening of the communication portion 50 on the introduction chamber 41 side is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5. The opening of the communication portion 50 on the output chamber 42 side is provided on the inner peripheral surface of the through hole 53 of the valve member 5 (specifically, the inner peripheral surface of the partitioned first inner chamber 44A).

The elastic member 6 shown in FIG. 11 (A) is not a ring shape as shown in FIG. 4 (A), but is, for example, a plate-like member. As shown in FIG. 11 (A), the plate-shaped elastic member 6 such as a polygonal plate and a disk may be disposed so as to block the opening on the introduction chamber 41 side of the communication portion 50. One end portion (the upper end portion in FIG. 11 (A)) of the elastic member 6 is fixed to the valve member 5. The other end side of the elastic member 6 is not fixed to the valve member 5.

Since the elastic member 6 is configured to use the elastic force of the elastic member 6 to close the communication portion 50, as shown in FIG. 11 (A), when there is no pressure difference between the introduction chamber 41 and the output chamber 42, and during the introduction When the pressure in the chamber 41 is higher than the pressure in the output chamber 42, the communication portion 50 is maintained in a closed state. On the other hand, as shown in FIG. 11 (B), if the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, the other end side of the elastic member 6 is elastically deformed in a direction away from the valve member 5, A gap G is formed between the elastic member 6 and the communication portion 50. As a result, the communication unit 50 is switched from the closed state to the open state.

Although not shown, the elastic member 6 is not limited to those having a ring shape or a plate shape. For example, when the communication portion 50 is composed of only the via hole 51, the elastic member 6 may have a plug-like shape capable of blocking the via hole 51. Various shapes such as a columnar shape and a corner columnar shape can be exemplified as the plug shape.

The cross-sectional shape of the via hole is not limited to a circle, and may be a polygon such as a quadrangle. The above embodiment exemplifies a case where the fluid supplied from the pressure fluid source is air. Alternatively, the fluid supplied from the pressure fluid source may be a gas other than air or a liquid.

The fluid control valve described in connection with the above embodiment mainly has the following features.

The fluid control valve according to the embodiment described above includes: a main body portion having an introduction chamber into which a fluid is introduced from a pressure fluid source and an output chamber connected to the introduction chamber via a passage; and a valve member, which can The aforementioned passage is opened and closed, and communication is formed A communication portion between the introduction chamber and the output chamber; and an elastic member provided at the communication portion. The communication portion is closed using the elastic force of the elastic member, and if the pressure of the output chamber becomes higher than the pressure of the introduction chamber, the elastic member is deformed to change the communication portion from the closed state. Is on.

According to the above configuration, the communicating portion is closed due to the elastic force of the elastic member. Therefore, the communicating portion can be maintained when there is no pressure difference between the introduction chamber and the output chamber and when the pressure in the introduction chamber is higher than the pressure in the output chamber. Is off. On the other hand, when the pressure in the output chamber becomes higher than the pressure in the introduction chamber, the elastic member is elastically deformed to switch the communication portion from the closed state to the open state, so the pressure fluid remaining in the output chamber is introduced into the introduction chamber. Side from the output chamber. For example, when the pressure fluid in the primary introduction chamber is discharged for maintenance or the like, even if the passage is closed by the valve member, the elastic member is elastically deformed by the pressure difference between the introduction chamber and the output chamber, so that it can be made The communication part is in an open state. Therefore, the pressure fluid remaining in the output chamber is introduced into the introduction chamber side and discharged from the output chamber. According to the above structure, the structure for automatically discharging the pressure fluid in the output chamber when the pressure fluid in the introduction chamber is discharged can be made in a small amount compared with the prior art in which the valve member 5 and the check valve of the spring must be provided. The components are miniaturized.

With regard to the fluid control valve, the communication portion may include at least one passage hole provided so as to extend from the introduction chamber to the output chamber.

According to the above configuration, the communication portion can be easily formed in the valve member by a simple process of forming at least one hole in the valve member.

With regard to the fluid control valve, the introduction chamber may be provided around the valve member. The communication portion may include a slot formed in a circumferential direction on an outer peripheral surface of the valve member. The slot may be opened in the introduction chamber. The at least one via hole may be connected to the slot and open in the output chamber. The elastic member may be formed in a ring shape and disposed in the slot.

According to the above configuration, the annular elastic structure is arranged only in the slot formed in the circumferential direction. The communication part can be closed by using the elastic force (contraction force) of the elastic member. Since the elastic member is disposed in the slot, the position of the elastic member is less likely to deviate. The above-mentioned simple structure can realize these functions.

The fluid control valve may include a guide portion that guides a part of the valve member when the valve member is displaced. The slot may be provided at a position that is not guided by the guide portion.

According to the above configuration, since the elastic member does not interfere with the guide portion when the valve member is displaced, the smoothness of the displacement of the valve member can be maintained.

With regard to the fluid control valve, a pressing member may be provided between the valve member and the guide portion. The elastic member may be composed of a member having the same specifications as the pressing member.

According to the above configuration, since an elastic member having the same specifications as the pressing member can be used, it is difficult to produce a difference in assembly of the pressing member and the elastic member during manufacture. In addition, the manufacturing cost of the fluid control valve can be suppressed to a low level.

In the fluid control valve, in a cross section parallel to the direction in which the valve member is displaced, the slot may be formed such that its height becomes higher as it goes from the inside to the outside of the valve member.

According to the said structure, a slot is formed so that height may become high as it goes from the inside to the outside of a valve member. Therefore, if the elastic member is elastically deformed so as to be stretched toward the introduction chamber side having a lower pressure than the output chamber, it is easy to form a gap early between the slot and the elastic member. Therefore, the pressure fluid remaining in the output chamber is discharged to the introduction chamber side early.

With regard to the fluid control valve, in the cross section parallel to the direction in which the valve member is displaced, it is prescribed that one of the opposing surfaces of the height of the slot may extend linearly, respectively.

According to the above configuration, the design of the slot and the processing of forming the slot are facilitated.

Regarding the fluid control valve, any one of the pair of facing surfaces may be a surface parallel to a cross section orthogonal to the direction in which the valve member is displaced.

According to the above configuration, since the processing of parallel surfaces is particularly easy, the entire slot is added. Work becomes easy.

With regard to the fluid control valve, the annular elastic member may have a circular or elliptical cross section orthogonal to a circumferential direction of the elastic member.

According to the above configuration, since the cross-sectional shape of the elastic member is a circular shape or an oval shape, it is difficult to reduce the sealing function for closing the communication portion. Therefore, when the elastic member that has been elastically deformed so as to extend toward the introduction chamber side is recovered so as to be contracted on the output chamber side, even if a part is twisted, the communication member can be appropriately closed.

With regard to the fluid control valve, the communication portion may have a plurality of passage holes as the at least one passage hole.

According to the above configuration, since the communication portion has a plurality of passage holes, a designer who designs the fluid control valve can increase the area of the passage that guides the pressure fluid remaining in the output chamber to the introduction chamber. Therefore, the pressure fluid can be quickly discharged.

With regard to the fluid control valve, the plurality of passage holes may be provided at positions that are symmetrical when the valve member is viewed from a direction in which the valve member is displaced.

According to the above configuration, for example, when a part of the elastic member is elastically deformed so as to extend toward the introduction chamber side, the distance between the deformed portion of the elastic member and the passage hole does not become excessively long. Therefore, a path for guiding the pressure fluid remaining in the output chamber to the introduction chamber can be formed early. For example, in the case where the passage hole is a through hole penetrating the valve member, a plurality of passage holes arranged at symmetrical positions can prevent the strength of the valve member from being too small.

With regard to the fluid control valve, the output chamber may include an inner chamber provided inside the valve member. The total cross-sectional area of the plurality of via holes is equal to or less than the cross-sectional area of the inner chamber from the opening of the inner chamber to the narrowest portion of the plurality of via holes.

According to the above configuration, each via hole is effectively used without waste. The designer designing the fluid control valve may not form too many passage holes, so the strength of the valve member will not be too small.

With regard to the fluid control valve, the output chamber may include a valve member provided in the valve member. Ministry of Internal Affairs. The inner chamber may include a first inner chamber and a second inner chamber which is adjacent to the first inner chamber in a direction in which the valve member is displaced via a stepped portion and has an inner diameter larger than the first inner chamber. The at least one passage hole may have a position of an end portion of the at least one passage hole on the inner chamber side relative to a position of an end portion of the at least one passage hole on the introduction chamber side, relative to the step portion in the valve The way in which the component is displaced further away in the aforementioned direction extends from the introduction chamber side to the aforementioned first inner chamber.

According to the above configuration, since at least one of the passage holes extends from the introduction chamber side to the first inner chamber in such a manner that the relative step portion is away from the valve member in the direction of displacement of the valve member, the distance between the step portion and the passage hole is configured The thickness of some valve members does not become too thin. Therefore, the strength of the portion between the stepped portion and the via hole is not excessively small.

In the fluid control valve, the at least one passage hole may extend linearly from the introduction chamber side to the output chamber.

According to the above configuration, the via hole can be easily formed.

[Industrial availability]

The present invention can be widely applied to various devices for controlling using a fluid.

Claims (14)

A fluid control valve includes: a main body portion having an introduction chamber into which a fluid is introduced from a pressure fluid source and an output chamber connected to the introduction chamber via a passage; and a valve member capable of opening and closing the passage and formed with A communication portion that communicates the introduction chamber and the output chamber; and an elastic member that is provided at the communication portion; and the communication portion is in a closed state by using the elastic force of the elastic member, and if the pressure of the output chamber becomes When the pressure is higher than the introduction chamber, the elastic member is deformed to change the communication portion from the closed state to the open state. The fluid control valve according to claim 1, wherein the communication portion includes at least one passage hole provided so as to extend from the introduction chamber to the output chamber. The fluid control valve according to claim 2, wherein the introduction chamber is provided around the valve member; the communication portion includes a slot formed in a circumferential direction on an outer peripheral surface of the valve member; the slot is opened in the introduction chamber; The at least one via hole is connected to the slot and opens in the output chamber; and the elastic member is formed in a ring shape and is disposed in the slot. The fluid control valve according to claim 3, further comprising a guide portion that guides a part of the valve member when the valve member is displaced; and the slot is provided at a position that is not guided by the guide portion. The fluid control valve according to claim 4, wherein a pressing member is provided between the valve member and the guide portion; the elastic member is composed of a member having the same specifications as the pressing member. The fluid control valve according to claim 3, wherein in a cross section parallel to the direction in which the valve member is displaced, the slot is formed so that its height becomes higher as it goes from the inside to the outside of the valve member. The fluid control valve according to claim 6, wherein, in the aforementioned cross section parallel to the aforementioned direction in which the valve member is displaced, one of the opposing surfaces of the aforementioned height of the slot is defined to extend linearly, respectively. The fluid control valve according to claim 7, wherein any one of the pair of facing surfaces is a surface parallel to a cross section orthogonal to the direction in which the valve member is displaced. The fluid control valve according to claim 3, wherein the annular elastic member has a circular or oval cross section orthogonal to the circumferential direction of the elastic member. The fluid control valve according to claim 2, wherein the communication portion has a plurality of passage holes as the at least one passage hole. The fluid control valve according to claim 10, wherein the plurality of passage holes are provided at positions that are symmetrical when the valve member is viewed from a direction in which the valve member is displaced. The fluid control valve according to claim 10, wherein the output chamber includes an inner chamber provided inside the valve member; the total cross-sectional area of the plurality of passage holes is from the opening of the inner chamber to the plurality of passage holes. The cross-sectional area of the inner chamber in the narrowest part is below. The fluid control valve according to claim 2, wherein the output chamber includes an inner chamber provided inside the valve member; the inner chamber includes a first inner chamber; The second inner chamber adjacent to it in the displacement direction and having an inner diameter larger than that of the first inner chamber; the at least one passage hole is located at the end of the at least one passage hole on the inner chamber side relative to the introduction chamber. The position of the end portion of the at least one passage hole on the side extends farther from the introduction chamber side to the first inner chamber in a manner farther away from the step portion in the direction in which the valve member is displaced. The fluid control valve according to any one of claims 2 to 12, wherein the at least one passage hole extends linearly from the introduction chamber side to the output chamber.