JP2016080079A - Fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid control valve which can be constituted compact in size by using the small number of parts for automatically discharging the pressure fluid of an output chamber at a secondary side when a pressure fluid of an introduction chamber at a primary side is relieved.SOLUTION: A fluid control valve (2) comprises: a main body part (4) in which an introduction chamber (41) into which fluid is introduced from a pressure fluid source and an output chamber (42) which is connected to the introduction chamber (41) via a passage (40) are formed; a valve member (5) which can open and close the passage (40), and in which a communication part (50) for making the introduction chamber (41) and the output chamber (42) communicate with each other is formed; and an elastic member (6) which is arranged at the communication part (50), brings the communication part (50) into a closed state by its own elastic force, is deformed by a rise of the pressure of the output chamber (42) higher than that of the introduction chamber (41), and brings the communication part (50) into an open state from the closed state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid control valve.

  Conventionally, a valve (fluid control valve) that adjusts and outputs the pressure of a fluid such as air is known. This fluid control valve is used in, for example, a brake control device in a railway vehicle. In such a fluid control valve, a primary side introduction chamber into which a pressure fluid (compressed air) is introduced from a pressure fluid source and a secondary side output chamber connected to the introduction chamber via a passage are provided. The passage is opened and closed by the axial displacement of the valve member to adjust the pressure in the output chamber.

  In such a fluid control valve, the pressure fluid in the primary introduction chamber may be removed for maintenance or the like. However, when the structure of the fluid control valve is such that the closed state of the passage connecting the introduction chamber and the output chamber is maintained even when the primary side air is removed, and other parts of the output chamber are sealed. The secondary side pressure fluid remains in the output chamber. Thus, it is not preferable to perform maintenance such as removing the fluid control valve in a state where the pressure fluid remains in the output chamber. Further, if the pressure fluid remains in the output chamber on the secondary side for a long time, a load is continuously applied to the components of the fluid control valve, which may lead to deterioration of, for example, rubber components.

  Patent Document 1 discloses a variable load valve having a supply valve that supplies air having a pressure corresponding to a load of a railway vehicle to a brake device. FIG. 5 of this patent document 1 discloses a structure in which a supply chamber (introduction chamber) in which a supply valve is disposed and an output chamber are connected by a check valve provided on the side of the supply valve. When the pressure fluid in the supply chamber on the primary side is discharged, the valve element of the valve member in the check valve separates from the valve seat by overcoming the spring force of the check valve. Thereby, since the output chamber communicates with the supply chamber, the pressure fluid in the secondary output chamber is discharged through the primary supply chamber.

Japanese Utility Model Publication No. 60-24664

  However, in Patent Document 1, since the check valve for discharging the pressure fluid remaining on the secondary side is provided on the side of the supply valve as described above, a space for arranging the check valve is required. There is a problem that the overall size of the variable load valve becomes large. In addition, since the check valve requires two elements, that is, a valve member and a spring, as a component constituting the check valve, there is a problem that the number of components increases.

  An object of the present invention is to form a compact structure with a small number of parts for automatically discharging the pressure fluid in the output chamber on the secondary side when the pressure fluid in the introduction chamber on the primary side is removed. A fluid control valve is provided.

  The fluid control valve according to the present invention includes a main body in which 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 are formed, and the passage can be opened and closed. And a valve member in which a communication portion for communicating the introduction chamber and the output chamber is formed, and the communication portion is provided in the communication portion, and the communication portion is closed by its own elastic force, and more than the introduction chamber. And an elastic member that deforms when the pressure in the output chamber increases and changes the communicating portion from the closed state to the open state.

  In the present invention, since the elastic member is configured to close the communicating portion by its own elastic force, when there is no pressure difference between the introduction chamber and the output chamber, the pressure in the introduction chamber is higher than the pressure in the output chamber. When the height is too high, the communication portion can be kept closed. On the other hand, since the pressure in the output chamber becomes higher than the pressure in the introduction chamber, the communication portion can be elastically deformed to switch from the closed state to the open state. Can be discharged to the side. Thus, according to the present invention, for example, when the pressure fluid in the primary introduction chamber is removed for maintenance or the like, the elastic member is removed by the pressure difference between the introduction chamber and the output chamber even if the passage is closed by the valve member. The communicating portion is opened by being elastically deformed, whereby the pressure fluid remaining in the output chamber can be guided to the introduction chamber and discharged. Therefore, according to the present invention, a structure for automatically discharging the pressure fluid in the output chamber when the pressure fluid in the introduction chamber is removed is a check valve that requires a valve member and a spring as in the prior art. Compared with the case of using, it can be configured compactly with fewer parts.

  In the fluid control valve, it is preferable that the communication portion includes a passage hole provided so as to extend from the introduction chamber toward the output chamber.

  In this configuration, the communication portion can be easily provided in the valve member by a simple process of forming a hole in the valve member.

  In the fluid control valve, the introduction chamber is provided around the valve member, and the communication portion includes a slit formed along a circumferential direction on an outer peripheral surface of the valve member, It opens to the introduction chamber, the passage hole is connected to the slit and opens to the output chamber, and the elastic member is preferably formed in an annular shape and disposed in the slit.

  In this configuration, the communicating portion can be closed by its own elastic force (contraction force) only by arranging the annular elastic member in the slit formed along the circumferential direction. Moreover, since an elastic member is arrange | positioned at a slit, the position shift of an elastic member can be suppressed. These functions can be realized with a simple configuration.

  Preferably, the fluid control valve includes a guide portion that guides a part of the valve member when the valve member is displaced, and the slit is provided at a position that is not guided by the guide portion.

  In this 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.

  In the fluid control valve, a packing is preferably provided between the valve member and the guide portion, and the elastic member is preferably formed of a member having the same specifications as the packing.

  In this configuration, since an elastic member having the same specifications as the packing is used, an error in assembling the packing and the elastic member does not occur at the time of manufacture, and the cost is reduced.

  In the fluid control valve, it is preferable that, in a cross section parallel to the direction in which the valve member is displaced, the slit is formed to increase in height from the inside toward the outside of the valve member.

  In this configuration, the slit is formed so that its height increases from the inside to the outside of the valve member. Therefore, when the elastic member is elastically deformed so as to extend toward the introduction chamber when the pressure in the output chamber becomes higher than the pressure in the introduction chamber, the gap G is formed at an early stage between the slit and the elastic member. It becomes easy. As a result, the pressure fluid remaining in the output chamber can be quickly discharged to the introduction chamber side.

  In the fluid control valve, each of the pair of opposed surfaces defining the height of the slit preferably extends linearly in a cross section parallel to the displacement direction of the valve member. The slit design and the process of forming the slits are facilitated.

  In the fluid control valve, any one of the pair of opposed surfaces is preferably a surface parallel to a cross section orthogonal to a direction in which the valve member is displaced. Since such parallel surfaces are particularly easy to process, as a result, the entire slit is also easily processed.

  In the fluid control valve, the annular elastic member preferably has a circular or elliptical cross section perpendicular to the circumferential direction.

  In this configuration, when the elastic member is elastically deformed so as to extend toward the introduction chamber and then returns to contract toward the output chamber, even if a part of the elastic member is twisted, the cross-sectional shape of the elastic member is circular. Since it is a shape or an ellipse shape, it is hard to produce the fall of the sealing function for making a communicating part into a closed state.

  In the fluid control valve, it is preferable that the communication portion has a plurality of the passage holes.

  In this configuration, since the communicating portion has a plurality of passage holes, the area of the passage for guiding the pressure fluid remaining in the output chamber to the introduction chamber can be increased. Thereby, a pressure fluid can be discharged | emitted rapidly.

  In the fluid control valve, it is preferable that the plurality of passage holes are provided at symmetrical positions when the valve member is viewed in a direction in which the valve member is displaced.

  In this configuration, for example, when a part of the elastic member is elastically deformed so as to extend toward the introduction chamber, an increase in the distance between the deformed portion and the passage hole can be suppressed. Thereby, the path | route which guides the pressure fluid which remains in an output chamber to an introduction chamber is formed at an early stage. In this configuration, for example, when the passage hole is a through-hole penetrating the valve member, the strength of the valve member is locally reduced by arranging the plurality of passage holes at symmetrical positions. Can be suppressed.

  In the fluid control valve, the output chamber includes an inner chamber provided inside the valve member, and a total cross-sectional area of the plurality of passage holes is the largest from the opening of the inner chamber to the passage holes. The cross-sectional area in the narrow portion is preferably equal to or smaller than that.

  In this configuration, each passage hole can be used effectively without waste. Moreover, since the passage hole is not provided more than necessary, it is possible to suppress a decrease in strength of the valve member.

  In the fluid control valve, the inner chamber of the output chamber is adjacent to a first inner chamber and a direction in which the valve member is displaced through a step portion with respect to the first inner chamber, A second inner chamber having a larger inner diameter than the inner chamber, and the passage hole has an end portion of the passage hole on the inner chamber side rather than a position of an end portion of the passage hole on the introduction chamber side. It is preferable that the position extends from the introduction chamber side to the first inner chamber so as to be far from the stepped portion in the direction in which the valve member is displaced.

  In this configuration, the passage hole extends from the introduction chamber side to the first inner chamber so as to be farther from the step portion in the direction in which the valve member is displaced, so that a portion between the step portion and the passage hole is formed. It can suppress that the thickness of the valve member to comprise becomes small. Thereby, the strength reduction of the part between a level | step-difference part and a passage hole can be suppressed.

  In the fluid control valve, it is preferable that the passage hole extends linearly from the introduction chamber side to the output chamber, and in this case, processing for forming the passage hole is facilitated.

  As described above, according to the present invention, in the fluid control valve, the structure for automatically discharging the pressure fluid in the output chamber when the pressure fluid in the introduction chamber is removed can be compactly configured with few parts. Can do.

It is sectional drawing which shows the fluid control valve which concerns on embodiment of this invention. It is sectional drawing which shows the valve member of the said fluid control valve. (A) is the schematic which shows the example of arrangement | positioning of the communication part provided in the said valve member. (B)-(E) are schematic which shows the other example of arrangement | positioning of the communication part provided in the said valve member. (A) is a top view which shows the elastic member in the said fluid control valve, (B) is the IV-IV sectional view taken on the line in (A), and has shown an example of the cross-sectional shape of the said elastic member. (C) shows another example of the cross-sectional shape of the elastic member. (A)-(C) are sectional drawings which show the state which attached the elastic member shown to FIG. 4 (B) to the valve member. (D)-(F) is sectional drawing which shows the state which attached the elastic member shown in FIG.4 (C) to the valve member. (A)-(G) are sectional drawings which show the modification of the said elastic member. (A)-(C) are sectional drawings which show the example of arrangement | positioning of the said communication part. (A)-(C) are sectional drawings which show the example of arrangement | positioning of the said communication part. (A), (B) is sectional drawing which shows the example of arrangement | positioning of the said communication part. It is sectional drawing which shows the modification of the said valve member. (A), (B) is sectional drawing which shows the modification of the said valve member.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The fluid control valve 2 according to the embodiment of the present invention can be used for, for example, a railway vehicle. The fluid control valve 2 of the present embodiment can be used for applications such as a brake control device. The brake control device is for adjusting a brake pressure supplied to a brake cylinder (not shown). However, the fluid control valve 2 of the present embodiment is not limited to these applications, and can be used for other applications for controlling the operation of a railway vehicle or the like by adjusting the pressure of a pressure fluid such as compressed air. .

[Overall structure of flow control valve]
FIG. 1 is a cross-sectional view showing a fluid control valve 2 according to an embodiment of the present invention. As shown in FIG. 1, the fluid control valve 2 includes a main body portion 4 </ b> A (block 4 </ b> A), a valve member 5, an elastic member 6, a piston 7, a valve member spring 9, and a cylinder member 12. . A space is formed inside the main body 4A. By arranging the valve member 5, the piston 7, the cylinder member 12 and the like in this space, the space is partitioned into a plurality of spaces. The plurality of spaces include an introduction chamber 41 and an output chamber 42.

  At the boundary between the introduction chamber 41 and the output chamber 42, a passage 40 (opening / closing path 40) that connects the introduction chamber 41 and the output chamber 42 is provided. In the present embodiment, the passage 40 is an opening that opens, for example, in a circular shape at the boundary between the introduction chamber 41 and the output chamber 42. The passage 40 is partitioned by a valve seat 40B formed by a part of the main body 4A as shown in FIG.

  As shown in FIG. 1, the cylinder member 12 is provided so as to close 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 (upper end) is closed and the other end (lower end) is opened. The valve member 5 is inserted into the hollow portion of the cylinder member 12 through the opening at the other end.

  The valve member 5 is supported by the cylinder member 12 so as to be displaceable in the axial direction. The direction in which the valve member 5 is displaced is the direction of the central axis A in FIG. 1 (the axial direction of the valve member 5). The valve member 5 can open and close the passage 40 by being displaced in the axial direction. Specifically, the valve member 5 has a valve shaft 5A inserted into the hollow portion of the cylinder member 12 and a larger outer diameter than the valve shaft 5A adjacent to the valve shaft 5A on the passage 40 side of the valve shaft 5A. And a valve body 5B. The valve shaft 5 </ b> A is displaced in the axial direction while being guided by the guide portion 43 constituted by the inner peripheral surface of the cylinder member 12.

  The hollow part of the cylinder member 12 includes an upper hollow part and a lower hollow part having a larger inner diameter. The valve shaft 5A of the valve member 5 is disposed in the upper hollow portion, and the valve body 5B of the valve member 5 is disposed 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 5 </ b> A, and the packing 11 is disposed in the groove 58. Thereby, the sealing performance (airtightness) between the introduction chamber 41 and the output chamber 42 can be enhanced. In the present embodiment, the groove 58 is provided in an annular shape so as to be continuous in the circumferential direction on the outer peripheral surface of the valve shaft 5A. For example, an annular packing such as an O-ring can be used as the packing 11, but is not limited thereto.

  A force is applied to the valve member 5 in a direction for closing the passage 40 by a spring 9 for the valve member. In this embodiment, in order to keep the force required for the spring 9 for the valve member as small as possible, the air applied to the valve member 5 on one side (the closing side) and the other side (the opening side) in the axial direction. The surface area of each part of the valve member 5 is designed so that the pressure is balanced.

  When the force by which the piston 7 pushes the valve member 5 is larger than the force toward the closing side including the force by the spring 9 for the valve member, the valve member 5 moves in a direction for opening the passage 40. When the force toward the closing side including the force by the spring 9 for the valve member is larger than the pushing force by the piston 7, the valve member 5 maintains the passage 40 in the closed state.

  The end face 55 of the valve body 5B is in contact with the valve seat 40B in the closed state in which the introduction chamber 41 and the output chamber 42 do not communicate with each other, and in the open state in which the introduction chamber 41 and the output chamber 42 communicate with each other. Separated from. The diameter of the end surface 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 to which pressure fluid (compressed air in this embodiment) is supplied from a pressure fluid source (not shown). The pressure fluid flows into the introduction chamber 41 from the pressure fluid source. As shown in FIG. 1, the introduction chamber 41 is provided so as to surround the valve member 5 and the cylinder member 12.

  The output chamber 42 is a space connected to the introduction chamber 41 via the passage 40. The passage 40 opens and closes with the displacement of the valve member 5. The pressure fluid in the introduction chamber 41 flows into the output chamber 42 when the passage 40 is in the open state, while the pressure fluid in the introduction chamber 41 is blocked from flowing into the output chamber 42 when the passage 40 is in the closed state. The pressure of the pressure fluid in the output chamber 42 is adjusted by controlling the opening and closing of the passage 40. The pressure fluid whose pressure is adjusted is supplied to, for example, a brake cylinder (not shown) of the brake control device.

  When the pressure of the pressure fluid in the output chamber 42 is smaller than the predetermined range, the passage 40 is opened and the pressure fluid in the introduction chamber 41 flows into the output chamber 42, whereby the pressure in the output chamber 42 is reduced. Enhanced. When the pressure fluid pressure in the output chamber 42 is larger than a predetermined range, a part of the pressure fluid in the output chamber 42 is discharged through a discharge passage (not shown). Thereby, the pressure of the output chamber 42 is reduced.

  The piston 7 is supported by the main body 4A via a support member 4D so as to be displaceable in the axial direction. The valve member 5 operates as the piston 7 is displaced. The piston 7 extends in a direction parallel to the axial direction of the valve member 5. In the present embodiment, the central axis A of the valve member 5 and the central axis A of the piston 7 coincide with each other, but the present invention is not limited to this. One end portion (upper end portion in FIG. 1) of the piston 7 is in contact with or close to the end surface 55 of the valve body 5B of the valve member 5.

  As shown in FIG. 1, a concave portion that is recessed in a direction away from the valve member 5 is formed at the upper end portion of the piston 7, and a through hole 7 </ b> A is formed in a wall that partitions the concave portion. Thereby, the pressure in the recessed part of piston 7 and the pressure around the front-end | tip part of piston 7 become the same.

  A force is applied to the piston 7 in a direction away from the valve member 5 by a piston spring (not shown). When the passage 40 is closed, the piston 7 is stationary at a position where the valve member 5 is not pressed by the force of the piston spring 9. When the passage 40 is opened, the piston 7 is pushed toward the valve member 5 by the piston pressure fluid supplied through the passage (not shown), so that the piston 7 moves toward the valve member 5 and moves to the valve member 5. A pressing force is applied to the valve member 5 to displace the valve member 5. Thereby, the passage 40 is switched from the closed state to the open state. When the pressure fluid for the piston is discharged through, for example, the passage, the passage 40 is switched from the open state to the closed state.

[Secondary fluid discharge structure of fluid control valve]
Next, the discharge structure of the pressure fluid (secondary fluid) in the output chamber 42 in the fluid control valve 2 will be specifically described. As shown in FIG. 1, the fluid control valve 2 forms a secondary fluid discharge structure compactly with a small number of parts compared to, for example, a check valve including a valve member and a spring as in Patent Document 1. can do.

  As shown in FIG. 1, in the fluid control valve 2 of the present embodiment, the valve member 5 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 between the open state and the closed state of the communication portion 50.

  In the valve member 5, an introduction chamber 41 that is a primary side and an output chamber 42 that is a secondary side are provided at positions adjacent to each other via a part of the valve member 5. Specifically, as shown in FIGS. 1 and 2, in the present embodiment, the valve member 5 is provided with a through hole 53 that penetrates in the axial direction (direction of the central axis A). A space defined by the inner peripheral surface in the through hole 53 constitutes a part of the output chamber 42 (the inner chamber 44 of the output chamber 42). An introduction chamber 41 is provided around the valve member 5. That is, in the present embodiment, when focusing on the valve member 5, the outside (radially outer side) of the valve member 5 is the primary introduction chamber 41, and the inside (radially inner side) of the valve member 5 is the secondary side. This is the output chamber 42. That is, the primary side and the secondary side are separated by the peripheral wall of the valve member 5, and the primary side and the secondary side are adjacent to each other through the peripheral wall of the valve member 5. In this embodiment, using the structure where 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 is provided so as to penetrate the peripheral wall.

  The elastic member 6 is provided in the communication part 50. Since the elastic member 6 is configured to close the communication portion 50 by its own elastic force (contraction force), when there is no pressure difference between the introduction chamber 41 and the output chamber 42 and the pressure in the introduction chamber 41 is the output chamber 42. When the pressure is higher than the first pressure, the communication portion 50 can be kept closed. On the other hand, the pressure in the output chamber 42 is higher than that in the introduction chamber 41, and these differential pressures elastically deform the elastic member 6 against the elastic force of the elastic member 6, and the opening on the introduction chamber 41 side in the communication portion 50. When the gap G is formed between the elastic member 6 and the communication member 50, the communication unit 50 is switched from the closed state to the open state. Thereby, the pressure fluid remaining in the output chamber 42 can be guided to the introduction chamber 41 side and discharged.

  The above is the main feature of the secondary fluid discharge structure in the fluid control valve 2, but the communication part 50 and the elastic member 6 which are the main parts of the discharge structure will be described in more detail below.

[Communication section]
As shown in FIGS. 1 and 2, the communication part 50 includes a passage hole 51 and a slit 52. The passage hole 51 is provided so as to extend from the output chamber 42 toward the introduction chamber 41. The passage hole 51 passes through the valve member 5. The slit 52 is a groove-shaped part formed along the circumferential direction on the outer peripheral surface of the valve member 5. The slit 52 opens into the introduction chamber 41. The passage hole 51 is connected to the slit 52 and opens to the output chamber 42.

  An opening on the introduction chamber 41 side (opening of the slit 52) in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5 </ b> A of the valve member 5. The passage hole 51 extends from the slit 52 to the inside (the central axis A side) of the valve member 5. An opening on the output chamber 42 side (opening of the passage hole 51) in the communication portion 50 is provided on the inner peripheral surface of the inner chamber 44 of the valve member 5. In this case, when the opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve body 5B as in a modification shown in FIGS. 8C and 9A described later. In comparison, the length of the communication portion 50 can be reduced.

  As shown in FIG. 2, the passage hole 51 extends linearly from the introduction chamber 41 side to the output chamber 42, but is not limited to this, and is curved as shown in FIG. You may have a part.

  In the embodiment shown in FIG. 2, the communication part 50 has a plurality of passage holes 51. The plurality of passage holes 51 extend outward (in a direction away from the central axis A) from an inner chamber 44 (a through hole 53 provided in the valve member 5) constituting a part of the output chamber 42 provided in the valve member 5. ing. FIG. 3A is a schematic diagram illustrating an arrangement example of the communication portion 50 provided in the valve member 5. In the arrangement example shown in FIG. 3 (A), the communication portion 50 has six passage holes 51. However, the arrangement is not limited to this, and other arrangement examples shown in FIGS. 3 (B) to 3 (E) are used. It may be configured. 3A to 3D, the communication part 50 has a plurality of passage holes 51, but the communication part 50 is a single one as in the arrangement example shown in FIG. Only the passage hole 51 may be provided.

  In the arrangement example shown in FIGS. 3A to 3C, the plurality of passage holes 51 are provided at positions that are symmetrical when the valve member 5 is viewed from the axial direction. Specifically, in FIGS. 3A to 3C, the plurality of passage holes 51 are arranged so as to be rotationally symmetric with the central axis A as the symmetry axis. However, the plurality of passage holes 51 may be arranged at positions that are not symmetrical with respect to the central axis A as shown in FIG.

  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 an 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. In the form shown in FIG. 2, the opening on the output chamber 42 side in the passage hole 51 is inclined so as to be closer to the end surface 55 of the valve body 5 </ b> B than the opening on the introduction chamber 41 side in the passage hole 51. In the case of such an inclined structure, there are the following merits.

  As shown in FIG. 2, the inner chamber 44 of the output chamber 42 is adjacent to the first inner chamber 44 </ b> A and the first inner chamber 44 </ b> A in the axial direction via the step portion 45. A second inner chamber 44B having a larger inner diameter than 44A. In the present embodiment, since the passage hole 51 has an inclined structure as described above, the passage hole 51 on the inner chamber 44 side rather than the position of the end (opening) of the passage hole 51 on the introduction chamber 41 side. The position of the end (opening) is far from the stepped portion 45 in the axial direction. In this configuration, for example, a portion between the step 45 and the passage hole 51 as compared with a case where the passage hole 51 extends in a direction orthogonal to the axial direction as in a modification shown in FIG. It can suppress that the thickness of the valve member 5 which comprises this becomes small. Thereby, the strength reduction of the part between the level | step-difference part 45 and the passage hole 51 can be suppressed.

  The passage hole 51 may be inclined so that the opening on the introduction chamber 41 side in the passage hole 51 is closer to the end face 55 of the valve body 5B than the opening on the output chamber 42 side in the passage hole 51. Further, the passage hole 51 is in a direction orthogonal to the axial direction of the valve member 5 as in the modification shown in FIGS. 7B, 8A to 8C, and 9A described later. It may extend to. Further, the passage hole 51 may extend in a direction parallel to the axial direction of the valve member 5 as shown in FIGS. 7C and 9B described later.

  The total cross-sectional area of the plurality of passage holes 51 is equal to or smaller than the cross-sectional area in the narrowest portion between the opening 56 on the valve body 5B side in the inner chamber 44 and the passage hole 51, and the valve shaft 5A side in the inner chamber 44 The cross-sectional area of the narrowest portion between the opening 57 and the passage hole 51 is less than or equal to the cross-sectional area. In this case, each passage hole 51 can be used effectively without waste. Moreover, since the passage hole 51 is not provided more than necessary, the strength reduction of the valve member 5 can be suppressed.

  In the cross section including the central axis A of the valve member 5 as shown in FIG. 2, the slit 52 is formed so that the height (width) increases from the inside toward the outside of the valve member 5. In the form shown in FIG. 3, the angle θ2 formed by the pair of facing surfaces A1 and A2 forming the slit 52 is an acute angle larger than 0 degrees. Therefore, when the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 when the pressure in the output chamber 42 is higher than the pressure in the introduction chamber 41, the gap G is formed between the slit 52 and the elastic member 6. (See FIG. 5C) is easily formed at an early stage. Thereby, the pressure fluid remaining in the output chamber 42 can be quickly discharged to the introduction chamber 41 side.

  In the present embodiment, the end of the slit 52 on the side of the passage 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 passage hole 51. Therefore, in the present embodiment, the slit 52 has a curved surface on the side of the passage hole 51 and a pair of facing surfaces A1 and A2 connected to the curved surface. In FIG. 2, the distance (axial distance) between the opposing surfaces A1 and A2 at the boundary between the curved surface and the pair of opposing surfaces A1 and A2 is indicated by an arrow S1, and the opposing surfaces A1 and A2 in the opening of the slit 52 are (Distance in the axial direction) is indicated by an arrow S2. In the present embodiment, the distance S2 is larger than the distance S1.

  As shown in FIG. 10 described later, the pair of facing surfaces A1 and A2 in the slit 52 may be parallel to each other, and the height decreases from the inside toward the outside of the valve member 5. It may be formed.

  In the present embodiment, each of the pair of facing surfaces A <b> 1 and A <b> 2 that define the height of the slit 52 extends linearly in a cross section including the central axis A of the valve member 5. In this case, the design of the slit 52 and the processing for forming the slit 52 are facilitated. Moreover, one opposing surface A1 is parallel to a plane orthogonal to the axial direction of the valve member 5. Such parallel surfaces are particularly easy to process, and as a result, the entire slit 52 is also easily processed.

  One or both of the pair of facing surfaces A1 and A2 in the slit 52 may be curved instead of linear.

  In this embodiment, as shown in FIG. 1, the slit 52 is an inner peripheral surface of the cylinder member 12 that guides the valve shaft 5 </ b> A (an inner peripheral surface of an upper hollow portion having a small inner diameter among the hollow portions of the cylinder member 12). It is provided in the position which is not guided by the guide part 43 which is. That is, the slit 52 is provided at a position that is offset in the axial direction of the valve member 5 by a length greater than the distance by which the valve member 5 is displaced in the axial direction with respect to the guide portion 43. Thereby, since the elastic member 6 does not interfere with the guide part 43 when the valve member 5 is displaced, the smoothness of the displacement of the valve member 5 can be maintained.

[Elastic member]
4A is a plan view showing the elastic member 6 in the fluid control valve 2, and FIG. 4B is a cross-sectional view taken along line IV-IV in FIG. An example is shown. The elastic member 6 is formed in an annular shape (specifically, an annular shape) and is disposed in the slit 52. When the elastic member 6 is disposed in the slit 52, the elastic member 6 is configured to contract in the circumferential direction so that a force is applied to the slit 52 in the direction toward the central axis A of the valve member 5.

  Since the elastic member 6 is configured such that a force acts on itself in the direction in which the communicating portion 50 is closed by its own elastic force (contractive force), the pressure difference between the introduction chamber 41 and the output chamber 42. When there is no pressure and when the pressure in the introduction chamber 41 is higher than the pressure in the output chamber 42, the communicating portion 50 can be maintained in the closed state. On the other hand, since the pressure in the output chamber 42 becomes higher than the pressure in the introduction chamber 41 and the communication portion 50 can be switched from the closed state to the open state due to elastic deformation, the pressure remaining in the output chamber 42 The fluid can be guided to the introduction chamber 41 side and discharged.

  As shown in FIG. 1 and FIG. 4A, in the present embodiment, the slit 52 and the elastic member 6 are both formed in an annular shape. The communication part 50 can be closed by (shrinking force). Moreover, since the elastic member 6 is arrange | positioned at the slit 52, the position shift of the elastic member 6 can be suppressed.

  As shown in FIG. 4 (B), the elastic member 6 has a circular cross section orthogonal to the circumferential direction, but is not limited to this, and may be elliptical as shown in FIG. 4 (C). . In these cases, even when a part of the elastic member 6 is twisted when the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 and then contracts toward the output chamber 42, the elastic member 6 is elastic. Since the cross-sectional shape of the member 6 is a circular shape or an elliptical shape, it is difficult for the sealing function to be lowered for closing the communicating portion 50.

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

  In the present embodiment, the elastic member 6 is composed of a member having the same specifications as the packing 11. As described above, the packing 11 is disposed in the groove 58 formed on the outer peripheral surface of the valve shaft 5A in order to improve the sealing performance between the introduction chamber 41 and the output chamber 42. Thus, since the elastic member 6 is a member having the same specifications as the packing 11, an error in assembling the packing 11 and the elastic member 6 does not occur at the time of manufacturing, and it contributes to cost reduction.

  Examples of the material constituting the elastic member 6 include synthetic resin and metal, but it is preferable to use synthetic resin from the viewpoint of sealing properties. Examples of synthetic resins include natural rubber, chloroprene rubber, acrylonitrile butadiene rubber, ethylene propylene rubber, isobutylene isoprene rubber, chlorosulfonated polyethylene rubber, styrene butadiene rubber, butadiene rubber, silicone rubber, fluoro rubber, urethane rubber, fluoro resin, etc. can do. Examples of the fluororesin include polytetrafluoroethylene.

[Operation]
5A to 5C are cross-sectional views illustrating a state where the elastic member 6 (the elastic member 6 having a circular cross section) illustrated in FIG. 4B is attached to the valve member 5. FIGS. 5A and 5B show that the elastic member 6 communicates the communication portion when there is no pressure difference between the introduction chamber 41 and the output chamber 42 and when the pressure in the introduction chamber 41 is higher than the pressure in the output chamber 42. 50 shows a closed state. FIG. 5C shows a state where the elastic member 6 is elastically deformed and the communication portion 50 is opened when the pressure in the output chamber 42 is higher than the pressure in the introduction chamber 41.

  When both the elastic members 6 shown in FIGS. 5A and 5B are disposed in the slit 52, the elastic member 6 contracts in the circumferential direction, so that the slit 52 extends in the direction toward the central axis A of the valve member 5. It is designed to apply force against. The elastic member 6 shown in FIG. 5B has a larger contraction force than the elastic member 6 shown in FIG. As a result, the elastic member 6 shown in FIG. 5B is more elastically deformed flat in the slit 52 than the elastic member 6 shown in FIG. It has entered. Thereby, the sealing performance which makes the communicating part 50 a closed state can be improved.

  For example, when the pressure fluid in the primary introduction chamber 41 is withdrawn 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 causes a difference in FIG. As shown, the elastic member 6 is elastically deformed, and a gap G is formed between the elastic member 6 and the inner surface (opposing surface A1 or opposing surface A2) of the slit 52. As a result, the communication part 50 is opened, and the pressure fluid remaining in the output chamber 42 can be guided to the introduction chamber 41 side and discharged.

  5D to 5F are cross-sectional views illustrating a state where the elastic member 6 (the elastic member 6 having an elliptical cross section) illustrated in FIG. 4C is attached to the valve member 5. FIGS. 5D to 5F are diagrams corresponding to FIGS. 5A to 5C described above, and thus detailed description is omitted, and only differences are described.

  5D and FIG. 5E show the communication portion by the elastic member 6 when there is no pressure difference between the introduction chamber 41 and the output chamber 42 and when the pressure in the introduction chamber 41 is higher than the pressure in the output chamber 42. 50 shows a closed state. FIG. 5F shows a state where the elastic member 6 is elastically deformed and the communication portion 50 is opened when the pressure in the output chamber 42 is higher than the pressure in the introduction chamber 41.

  5D to 5F, since the elastic member 6 has an elliptical shape, the elastic member 6 has a circular shape by adjusting the orientation of the major axis of the ellipse so as to follow the shape of the slit 52. Compared to the case, it becomes easier to follow the space of the slit 52, and the sealing performance can be improved.

[Summary of Embodiment]
As described above, in the present embodiment, the elastic member 6 is configured to close the communicating portion 50 by its own elastic force, so that there is no pressure difference between the introduction chamber 41 and the output chamber 42. When the pressure in the introduction chamber 41 is higher than the pressure in the output chamber 42, the communication portion 50 can be maintained in the closed state. On the other hand, since the pressure in the output chamber 42 becomes higher than the pressure in the introduction chamber 41 and the communication portion 50 can be switched from the closed state to the open state due to elastic deformation, the pressure remaining in the output chamber 42 The fluid can be guided to the introduction chamber 41 side and discharged. Thus, in this embodiment, for example, when the pressure fluid in the primary introduction chamber 41 is removed for maintenance or the like, even if the passage 40 is closed by the valve member 5, the introduction chamber 41 and the output chamber 42 Due to the pressure difference, the elastic member 6 is elastically deformed to open the communicating portion 50, whereby the pressure fluid remaining in the output chamber 42 can be guided to the introduction chamber 41 side and discharged. Therefore, in this embodiment, it is necessary to provide a valve member 5 and a spring as in the conventional structure for automatically discharging the pressure fluid in the output chamber 42 when the pressure fluid in the introduction chamber 41 is removed. Compared to the case where a check valve is used, it can be configured compactly with fewer parts.

  In the present 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 part 50 can be easily provided in the valve member 5 by a simple process of forming a hole in the valve member 5.

  In the present embodiment, the introduction chamber 41 is provided around the valve member 5, and the communication part 50 includes a slit 52 formed along the circumferential direction on the outer peripheral surface of the valve member 5, and the slit 52 is introduced It opens to the chamber 41, the passage hole 51 is connected to the slit 52 and opens to the output chamber 42, and the elastic member 6 is formed in an annular shape and is disposed in the slit 52.

  In this configuration, the communicating portion 50 can be closed by its own elastic force simply by disposing the annular elastic member 6 in the slit 52 formed along the circumferential direction. Moreover, since the elastic member 6 is arrange | positioned at the slit 52, the position shift of the elastic member 6 can be suppressed. These functions can be realized with a simple configuration.

  In the present embodiment, the fluid control valve 2 includes a guide portion 43 that guides a part of the valve member 5 when the valve member 5 is displaced, and the slit 52 is provided at a position that 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 can be maintained. Further, in this configuration, the shape of the slit 52 is not easily restricted, and the degree of freedom in designing the slit 52 can be improved.

  In the present embodiment, the packing 11 is provided between the valve member 5 and the guide portion 43, and the elastic member 6 is configured by a member having the same specifications as the packing 11. In this configuration, since the elastic member 6 having the same specification as that of the packing 11 is used, an error in assembling the packing 11 and the elastic member 6 does not occur at the time of manufacture, and the cost is reduced.

  In the present embodiment, in the cross section parallel to the axial direction of the valve member 5, the slit 52 is formed such that the height increases from the inside toward the outside of the valve member 5. In this configuration, the slit 52 is formed to increase in height from the inside to the outside of the valve member 5. Therefore, when the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 when the pressure in the output chamber 42 is higher than the pressure in the introduction chamber 41, the gap G is formed between the slit 52 and the elastic member 6. Is easily formed at an early stage. Thereby, the pressure fluid remaining in the output chamber 42 can be quickly discharged to the introduction chamber 41 side.

  If the angle θ2 (opening angle) between the pair of facing surfaces A1 and A2 in the slit 52 is too large, the sealing performance may be deteriorated. If the angle θ2 is too small, the force for tightening the elastic member 6 by the slit 52 May become difficult to elastically deform. Therefore, the opening angle θ2 is set in consideration of these points.

  In the present embodiment, in the cross section parallel to the axial direction of the valve member 5, each of the pair of facing surfaces A <b> 1 and A <b> 2 that defines the height of the slit 52 extends linearly. In this case, the design of the slit 52 and the processing for forming the slit 52 are facilitated.

  In the present embodiment, one of the pair of facing surfaces A <b> 1 and A <b> 2 is a surface parallel to a cross section orthogonal to the axial direction of the valve member 5. Such parallel surfaces are particularly easy to process, and as a result, the entire slit 52 is also easily processed.

  In the present embodiment, the annular elastic member 6 has a circular or elliptical cross section perpendicular to the circumferential direction. In this configuration, even if a part of the elastic member 6 is twisted when the elastic member 6 is elastically deformed so as to extend toward the introduction chamber 41 and then returns to be contracted toward the output chamber 42, even if a part of the elastic member 6 is twisted. Since the cross-sectional shape is a circular shape or an elliptical shape, the sealing function for closing the communicating portion 50 is unlikely to deteriorate.

  In the present embodiment, the communication portion 50 has a plurality of passage holes 51. In this configuration, since the communication portion 50 has the plurality of passage holes 51, the area of the passage for guiding the pressure fluid remaining in the output chamber 42 to the introduction chamber 41 can be increased. Thereby, a pressure fluid can be discharged | emitted rapidly.

  In the present embodiment, the plurality of passage holes 51 are preferably provided at positions that are symmetrical 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, it is possible to suppress an increase in the distance between the deformed portion and the passage hole 51. Thereby, a path for guiding the pressure fluid remaining in the output chamber 42 to the introduction chamber 41 is formed at an early stage.

  In the present embodiment, the output chamber 42 includes an inner chamber 44 provided inside the valve member 5, and the total cross-sectional area of the plurality of passage holes 51 is the largest from the opening of the inner chamber 44 to the passage hole 51. It is below the cross-sectional area in a narrow part. In this configuration, each passage hole 51 can be used effectively without waste. Moreover, since the passage hole 51 is not provided more than necessary, the strength reduction of the valve member 5 can be suppressed.

  In the present embodiment, the inner chamber 44 of the output chamber 42 is adjacent to the first inner chamber 44A and the first inner chamber 44A in the axial direction via the stepped portion 45, and from the first inner chamber 44A. The passage hole 51 has a position of the end portion of the passage hole 51 on the inner chamber 44 side rather than the position of the end portion of the passage hole 51 on the introduction chamber 41 side. It is preferable to extend from the introduction chamber 41 side to the first inner chamber 44A so as to be farther in the axial direction than the stepped portion 45. In this configuration, the passage hole 51 extends from the introduction chamber 41 side to the first inner chamber 44 </ b> A so as to be far from the step portion 45 in the axial direction, so that the gap between the step portion 45 and the passage hole 51. It can suppress that the thickness of the valve member 5 which comprises a part becomes small. Thereby, the strength reduction of the part between the level | step-difference part 45 and the passage hole 51 can be suppressed.

  In the present embodiment, the passage hole 51 extends linearly from the introduction chamber 41 side to the output chamber 42. In this case, the process of forming the passage hole 51 is facilitated.

[Modification]
Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. FIG. 7A to FIG. 9B are cross-sectional views showing examples of arrangement of the communication portion 50. FIG. 10 is a cross-sectional view showing a modified example of the valve member 5. FIG. 11A and FIG. 11B are cross-sectional views showing modified examples of the valve member 5.

  In FIG. 7A, the communication part 50 has a passage hole 51 and a slit 52, and the passage hole 51 has a curved portion instead of a straight line as shown in FIG. In FIG. 7A, the entire passage hole 51 is curved. However, the present invention is not limited to this, and a structure in which a portion extending linearly and a portion extending while curving may be combined. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5 </ b> A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is within the through hole 53 provided in the valve member 5. It is provided on the peripheral surface (specifically, the internal peripheral surface of the first inner chamber 44A).

  In FIG. 7B, the communication portion 50 has a passage hole 51 and a slit 52, and the passage hole 51 extends in a direction orthogonal to the axial direction (center axis A) of the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is the inner peripheral surface of the through hole 53 of the valve member 5 ( Specifically, it is provided on the inner peripheral surface partitioning the first inner chamber 44A.

  In FIG. 7C, the communication portion 50 has a passage hole 51 and a slit 52, and the passage hole 51 extends in a direction parallel to the axial direction of the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is provided on the end surface 55 of the valve body 5B of the valve member 5. It has been.

  In FIG. 8A, the communication portion 50 has a passage hole 51 and a slit 52, and the passage hole 51 extends in a direction orthogonal to the axial direction (center axis A) of the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is the inner peripheral surface of the through hole 53 of the valve member 5 ( Specifically, it is provided on the inner peripheral surface that divides the second inner chamber 44B.

  In FIG. 8B, the communication part 50 has a passage hole 51 and does not have a slit 52. The passage hole 51 extends in a direction orthogonal to the axial direction (central axis A) of the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is the inner peripheral surface of the through hole 53 of the valve member 5 ( Specifically, it is provided on the inner peripheral surface partitioning the first inner chamber 44A.

  In FIG. 8C, the communication portion 50 has a passage hole 51 and does not have a slit 52. The passage hole 51 extends in a direction orthogonal to the axial direction (central axis A) of the valve member 5. In FIG. 8C, 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 communicating portion 50 of the valve member 5 by closing the communicating portion 120 of the cylinder member 12.

  In FIG. 9A, the communication portion 50 has a passage hole 51 and does not have a slit 52. The passage hole 51 extends in a direction orthogonal to the axial direction (central axis A) of the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve body 5B of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is the inner peripheral surface of the through hole 53 of the valve member 5 ( Specifically, it is provided on the inner peripheral surface partitioning the first inner chamber 44A.

  In FIG. 9B, the communication part 50 has a groove 54 and does not have a passage hole 51 and a slit 52. The groove 54 extends in a direction parallel to the axial direction of the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 (groove 54) is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 (groove 54) is on the valve member 5. The upper end of the valve shaft 5A (the end of the valve shaft 5A opposite to the valve body 5B) is provided. In FIG. 9B, the groove 54 is constituted 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 that the height (width) of the slit 52 is substantially constant. In this valve member 5, the angle formed by the pair of opposed surfaces A1 and A2 in the slit 52 is substantially zero.

  The valve member 5 shown in FIG. 11A is different from the embodiment shown in FIG. 1 in the structure and arrangement of the communicating portion 50 and the elastic member 6. In FIG. 11A, the communication part 50 has a passage hole 51 that penetrates the valve member 5. The opening on the introduction chamber 41 side in the communication portion 50 is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is the inner peripheral surface of the through hole 53 of the valve member 5 ( Specifically, it is provided on the inner peripheral surface partitioning the first inner chamber 44A.

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

  Since the elastic member 6 is configured to close the communicating portion 50 by its own elastic force, as shown in FIG. 11A, when there is no pressure difference between the introduction chamber 41 and the output chamber 42, and When the pressure in the introduction chamber 41 is higher than the pressure in the output chamber 42, the communication part 50 can be maintained in the closed state. On the other hand, as shown in FIG. 11B, when the pressure in the output chamber 42 becomes higher than the pressure in the introduction chamber 41, the other end of the elastic member 6 is elastically deformed in the direction away from the valve member 5, A gap G is formed between the elastic member 6 and the communication portion 50. Thereby, the communication part 50 can be switched from a closed state to an open state.

  In addition, although illustration is abbreviate | omitted, the elastic member 6 is not restricted to cyclic | annular form and plate shape. For example, when the communication part 50 is comprised only by the passage hole 51, the plug-like form which can block the passage hole 51 may be sufficient. Examples of the plug-like form include various shapes such as a columnar shape and a prismatic shape.

  Moreover, the cross-sectional shape of the passage hole is not limited to a circle, and may be a polygon such as a quadrangle. Moreover, in the said embodiment, although the case where the fluid supplied from a pressure fluid source was air was illustrated, it is not restricted to this. The fluid supplied from the pressure fluid source may be a gas other than air or a liquid.

2 fluid control valve 4A main body 5 valve member 6 elastic member 7 piston 9 spring 11 packing 40 passage 41 introduction chamber 42 output chamber 43 guide portion 44 inner chamber 44A first inner chamber 44B second inner chamber 45 stepped portion 50 communication Part 51 Passage hole 52 Slit

Claims (14)

A main body 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;
A valve member formed with a communication portion that allows the introduction chamber and the output chamber to communicate with each other, while the passage can be opened and closed;
Provided in the communication portion, the communication portion is closed by its own elastic force, and is deformed by the pressure of the output chamber being higher than that of the introduction chamber, so that the communication portion is opened from the closed state. And a fluid control valve.   The fluid control valve according to claim 1, wherein the communication portion includes a passage hole provided so as to extend from the introduction chamber toward the output chamber. The introduction chamber is provided around the valve member;
The communication portion includes a slit formed along the circumferential direction on the outer peripheral surface of the valve member,
The slit opens into the introduction chamber,
The passage hole is connected to the slit and opens to the output chamber,
The fluid control valve according to claim 2, wherein the elastic member is formed in an annular shape and disposed in the slit. A guide portion for guiding a part of the valve member when the valve member is displaced;
The fluid control valve according to claim 3, wherein the slit is provided at a position not guided by the guide portion. A packing is provided between the valve member and the guide part,
The fluid control valve according to claim 4, wherein the elastic member is formed of a member having the same specifications as the packing.   The cross-section parallel to the direction in which the valve member is displaced, the slit is formed to increase in height from the inside to the outside of the valve member. The fluid control valve described in 1.   The fluid control valve according to claim 6, wherein each of the pair of opposed surfaces defining the height of the slit extends linearly in a cross section parallel to the direction in which the valve member is displaced.   The fluid control valve according to claim 7, wherein any one of the pair of opposed surfaces is a surface parallel to a cross section orthogonal to a direction in which the valve member is displaced.   The fluid control valve according to any one of claims 3 to 8, wherein the annular elastic member has a circular or elliptical cross section orthogonal to a circumferential direction thereof.   The fluid control valve according to claim 2, wherein the communication portion has a plurality of the passage holes.   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 in a direction in which the valve member is displaced. The output chamber includes an inner chamber provided inside the valve member,
The fluid control valve according to claim 10 or 11, wherein the sum of the cross-sectional areas of the plurality of passage holes is equal to or less than the cross-sectional area of the narrowest portion from the opening of the inner chamber to the passage hole. The inner chamber of the output chamber is
A first interior room;
A second inner chamber adjacent to the first inner chamber in a direction in which the valve member is displaced through a stepped portion and having a larger inner diameter than the first inner chamber,
The passage hole is located with respect to the stepped portion in the direction in which the valve member is displaced in a position in which the end of the passage hole on the inner chamber side is displaced from the position of the end of the passage hole on the introduction chamber side. The fluid control valve according to claim 12, wherein the fluid control valve extends from the introduction chamber side to the first inner chamber so as to be far away.   The fluid control valve according to any one of claims 2 to 12, wherein the passage hole extends linearly from the introduction chamber side to the output chamber.

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