JP6534803B2 - Fluid control valve - Google Patents

Description

  The present invention relates to a fluid control valve.

  BACKGROUND Conventionally, a valve (fluid control valve) that regulates and outputs the pressure of a fluid such as air is known. The fluid control valve is used, for example, in a brake control device in a railway vehicle. In such a fluid control valve, an inlet chamber on the primary side into which pressure fluid (compressed air) is introduced from a pressure fluid source, and a secondary output chamber connected to the inlet chamber through a passage are provided. The pressure in the output chamber is adjusted by opening and closing the passage by axially displacing the valve member.

  In such a fluid control valve, pressure fluid in the inlet chamber of the primary side may be withdrawn for maintenance or the like.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 inlet chamber and the output chamber is maintained and other parts of the output chamber are also sealed even if the air on the primary side is removed. The pressure fluid on the secondary side remains in the output chamber. Thus, it is not so preferable that maintenance such as removing the fluid control valve is performed while the pressure fluid remains in the output chamber. In addition, if pressure fluid remains in the output chamber on the secondary side for a long time, load is continuously applied to parts of the fluid control valve, which may lead to deterioration of, for example, rubber parts.

  Patent Document 1 discloses a variable load valve having a supply valve that supplies air of pressure according to the 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. Then, when the pressure fluid in the supply chamber which is the primary side is discharged, the force of the spring of the check valve is overcome, and the valve body of the valve member in the check valve is separated from the valve seat. As a result, the output chamber communicates with the supply chamber, so that the pressure fluid in the output chamber on the secondary side is discharged through the supply chamber on the primary side.

Japanese Utility Model Publication No. 60-24664

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

  It is an object of the present invention to compactly construct a structure 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 drained. It is possible to provide a fluid control valve that can

The first fluid control valve according to the present invention is capable of opening and closing a main body portion in which an introduction chamber into which fluid is introduced from a pressure fluid source and an output chamber connected to the introduction chamber via a passage are formed. And a valve member having a communicating portion communicating the introducing chamber and the output chamber, and a valve member provided in the communicating portion to close the communicating portion by its own elastic force, and An elastic member that deforms when the pressure of the output chamber is higher than that of the chamber to open the communication portion from the closed state, and the communication portion is directed from the introduction chamber toward the output chamber The output chamber includes an inner chamber provided inside the valve member, and the inner chamber of the output chamber includes a first inner chamber, and the first inner chamber. The valve member is adjacent to the inner chamber in the displacement direction of the valve member via the step portion, A second inner chamber having an inner diameter larger than that of the first chamber, and the passage hole is an end of the passage hole on the inner chamber side than a position of an end of the passage hole on the introduction chamber side The position of the portion extends from the introduction chamber side to the first inner chamber so as to be far from the step portion in the displacement direction of the valve member .

  In the present invention, since the elastic member is configured to close the communication portion by its own elastic force, there is no pressure difference between the introduction chamber and the output chamber, and the pressure in the introduction chamber is higher than the pressure in the output chamber. When it is too high, the communication part can be maintained in the closed state. On the other hand, when the pressure in the output chamber becomes higher than the pressure in the introduction chamber, it can be elastically deformed and the communication part can be switched from the closed state to the open state, so the pressure fluid remaining in the output chamber can be introduced into the introduction chamber. It can be led to the side and discharged. As described above, according to the present invention, when pressure fluid in the inlet chamber on the primary side is removed for maintenance, for example, even if the passage is closed by the valve member, the elastic member is removed by the pressure difference between the inlet chamber and the output chamber. It is elastically deformed to open the communication part, whereby the pressure fluid remaining in the output chamber can be led to the introduction chamber side and discharged. Therefore, according to the present invention, the structure for automatically discharging the pressure fluid in the output chamber when the pressure fluid in the introduction chamber is drained is a check valve that needs to be provided with a valve member and a spring as in the prior art. Compared with the case of using, it can be configured compactly with few parts.

In the first fluid control valve, the communicating part, that contain the provided passage hole extending toward the output chamber from the inlet chamber.

  In this configuration, the communicating 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 communication portion preferably includes a plurality of the passage holes.

  In this configuration, since the communication portion has the plurality of passage holes, the area of the passage for leading the pressure fluid remaining in the output chamber to the introduction chamber can be increased. Thereby, pressure fluid can be discharged quickly.

  In the fluid control valve, preferably, the plurality of passage holes are provided at symmetrical positions when the valve member is viewed in the displacement direction of the valve member.

  In this configuration, for example, when a part of the elastic member elastically deforms so as to extend toward the introduction chamber, it is possible to suppress an increase in the distance between the deformed portion and the passage hole. As a result, a path leading the pressure fluid remaining in the output chamber to the introduction chamber is formed at an early stage. Moreover, in this configuration, for example, when the passage hole is a through hole that penetrates the valve member, the strength of the valve member is locally lowered 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 the total cross-sectional area of the plurality of passage holes is the largest from the opening of the inner chamber to the passage hole. It is preferably less than the cross sectional area in the narrow portion.

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

As described above, in the first fluid control valve, the inner chamber of the output chamber is displaced from the first inner chamber and the first inner chamber through the step portion. A second inner chamber adjacent in a direction and having an inner diameter larger than the first inner chamber, the passage hole being closer to the inner chamber than the position of the end of the passage hole on the introduction chamber side the position of the end of the passage hole in the side is, so far with respect to the step portion in the direction of displacement of the valve member, that extends from the introduction chamber side to the first inner chamber.

  In this configuration, the passage hole extends from the introduction chamber side to the first inner chamber so as to be far from the step portion in the displacement direction of the valve member, so a portion between the step portion and the passage hole is It can suppress that the thickness of the valve member to comprise becomes small. Thereby, the strength reduction of the portion between the stepped portion and the passage hole can be suppressed.

  In the fluid control valve, the passage hole preferably extends linearly from the introduction chamber side to the output chamber. 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 withdrawn is configured to be compact with a small number of parts. Can.

It is a sectional view showing a fluid control valve concerning an embodiment of the present invention. It is a sectional view showing the valve member of the 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) has shown the other example of the cross-sectional shape of the said 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 to FIG.4 (C) to the valve member. (A)-(G) is a sectional view showing the modification of the above-mentioned 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 of 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 example, in a railway car. The fluid control valve 2 of the present embodiment can be used, for example, in applications such as a brake control device. The brake control device is for adjusting the brake pressure supplied to the 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 has a main body 4A (block 4A), a valve member 5, an elastic member 6, a piston 7, a spring 9 for the valve member, and a cylinder member 12. . A space is formed inside the main body 4A. The space is divided into a plurality of spaces by arranging the valve member 5, the piston 7, the cylinder member 12 and the like in this space. 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 and closing passage 40) for connecting the introduction chamber 41 and the output chamber 42 is provided. In the present embodiment, the passage 40 is an opening that opens circularly, for example, 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 to close one end of a space formed inside the main body 4 </ b> A. The cylinder member 12 has a tubular 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 axially displaceably supported by the cylinder member 12. 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 an outer diameter larger 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 axially displaced 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 an upper hollow portion and a lower hollow portion 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 stem 5A, and the packing 11 is disposed in the groove 58. Thereby, the sealing performance (air tightness) 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 stem 5A. For example, an annular packing such as an O-ring can be used as the packing 11, but the present invention is not limited to this.

  The valve member 5 is urged by a valve member spring 9 in a direction to close the passage 40. In the present embodiment, in order to keep the force required for the valve member spring 9 as small as possible, the air applied to one side (close side) and the other side (open side) of the valve member 5 in the axial direction The surface area of each part of the valve member 5 is designed to balance the pressure.

  When the piston 7 pushes the valve member 5 more than the closing force including the force of the valve member spring 9, the valve member 5 moves the passage 40 in the open state. When the closing force, including the force from the spring 9 for the valve member, is greater than the pushing force by the piston 7, the valve member 5 keeps the passage 40 closed.

  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, and in the open state in which the introduction chamber 41 and the output chamber 42 communicate with each other It is 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 a pressure fluid (compressed air in the present 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 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 in accordance with the displacement of the valve member 5. While the pressure fluid in the introduction chamber 41 flows into the output chamber 42 when the passage 40 is in the open state, the pressure fluid in the introduction chamber 41 is prevented 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 regulated by controlling the opening and closing of the passage 40. The pressure-controlled pressure fluid is supplied, for example, to 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 Be enhanced. When the pressure of the pressure fluid in the output chamber 42 is larger than a predetermined range, a part of the pressure fluid in the output chamber 42 is configured to be discharged through the discharge path (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 axially displaceable. 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 the present embodiment, although the central axis A of the valve member 5 and the central axis A of the piston 7 coincide with each other, the present invention is not limited thereto. One end (the upper end 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, the upper end portion of the piston 7 is formed with a recess which is recessed in a direction away from the valve member 5, and a through hole 7A is formed in a wall which divides the recess. Thereby, the pressure in the recess of the piston 7 and the pressure around the tip of the piston 7 become the same.

  The piston 7 is biased in a direction away from the valve member 5 by a spring for a piston (not shown). When the passage 40 is closed, the piston 7 is at a position where it does not press the valve member 5 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 pressure fluid for the piston supplied through the passage (not shown), so that the piston 7 moves toward the valve member 5 and the valve member 5 is moved. Pressure is applied to displace the valve member 5. As a result, the passage 40 switches from the closed state to the open state. Passage of pressure fluid for the piston, for example, through the passage, switches the passage 40 from the open state to the closed state.

[Delivery structure of fluid on secondary side of fluid control valve]
Next, the discharge structure of the pressure fluid (secondary side fluid) in the output chamber 42 in the fluid control valve 2 will be specifically described. As shown in FIG. 1, in the fluid control valve 2, compared with the case where a check valve including a valve member and a spring is used as in Patent Document 1, for example, the discharge structure of the secondary side fluid is formed compactly with few parts. can do.

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

  The valve member 5 is provided at a position where the introduction chamber 41 which is the primary side and the output chamber 42 which is the secondary side are adjacent to each other through 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 penetrating in the axial direction (direction of the central axis A). A space partitioned by the inner circumferential 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, focusing on the valve member 5, the outside (radial direction outer side) of the valve member 5 is the primary introduction chamber 41, and the inside (radial direction inner side) of the valve member 5 is the secondary side. It is an 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 via the peripheral wall of the valve member 5. In the present embodiment, the communication portion 50 is provided so as to penetrate the peripheral wall by utilizing the structure in which the primary side and the secondary side are adjacent via the peripheral wall of the valve member 5.

  The elastic member 6 is provided in the communication portion 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, the pressure of the introduction chamber 41 is the output chamber 42. When the pressure is higher than the pressure, the communication unit 50 can be maintained in the closed state. On the other hand, the pressure of the output chamber 42 becomes higher than that of the introduction chamber 41, and the pressure difference between them causes the elastic member 6 to elastically deform against the elastic force of the elastic member 6, When the gap G is formed between the elastic member 6 and the communication member 50, the communication unit 50 switches from the closed state to the open state. As a result, the pressure fluid remaining in the output chamber 42 can be led to the introduction chamber 41 side and discharged.

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

[Communicating part]
As shown in FIGS. 1 and 2, the communication unit 50 includes a passage hole 51 and a slit 52. The passage hole 51 is provided to extend from the output chamber 42 toward the introduction chamber 41. The passage hole 51 penetrates the valve member 5. The slits 52 are groove-shaped portions formed along the circumferential direction on the outer peripheral surface of the valve member 5. The slit 52 is open to the introduction chamber 41. The passage hole 51 is connected to the slit 52 and is open to the output chamber 42.

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

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

  In the embodiment shown in FIG. 2, the communication unit 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) which constitutes a part of the output chamber 42 provided in the valve member 5. ing. FIG. 3A is a schematic view showing an arrangement example of the communication portion 50 provided in the valve member 5. Although the communicating portion 50 has six passage holes 51 in the arrangement example shown in FIG. 3A, the present invention is not limited to this, as in the other arrangement examples shown in FIGS. 3B to 3E. It may be configured. Further, in FIGS. 3A to 3D, although the communication portion 50 has a plurality of passage holes 51, the communication portion 50 is single as in the arrangement example shown in FIG. 3E. 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 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 not symmetrical with respect to the central axis A as shown in FIG. 3 (D).

  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 (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 such 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 embodiment shown in FIG. 2, the opening on the side of the output chamber 42 in the passage hole 51 is inclined so as to be closer to the end surface 55 of the valve body 5 B than the opening on the side of the introduction chamber 41 in the passage hole 51. In the case of such a sloped structure, there are the following advantages.

  As shown in FIG. 2, the inner chamber 44 of the output chamber 42 is axially adjacent to the first inner chamber 44A and the first inner chamber 44A via the step portion 45, and the first inner chamber And a second inner chamber 44B having an inner diameter larger than 44A. In the present embodiment, since the passage hole 51 has the inclined structure as described above, the passage hole 51 on the inner chamber 44 side than the position of the end (opening) of the passage hole 51 on the introduction chamber 41 side. The position of the end portion (opening) of the end portion is axially distant from the step portion 45. In this configuration, for example, a portion between the step 45 and the passage hole 51 as compared to the case where the passage hole 51 extends in the 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 these becomes small. Thereby, the strength reduction of the portion between the step 45 and the passage hole 51 can be suppressed.

  The passage hole 51 may be inclined such that the opening on the passage chamber 51 on the side of the introduction chamber 41 is closer to the end surface 55 of the valve body 5B than the opening on the passage chamber 51 on the side of the output chamber 42. In addition, the passage hole 51 is 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 less than the cross-sectional area of the narrowest portion between the opening 56 on the valve body 5B side in the inner chamber 44 and the passage hole 51. The cross-sectional area at the narrowest portion between the opening 57 of the and the passage hole 51 is equal to or less than the cross-sectional area. In this case, each passage hole 51 can be effectively used 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.

  The slit 52 is formed to have a height (width) that increases as it goes from the inside to the outside of the valve member 5 in a cross section including the central axis A of the valve member 5 as shown in FIG. In the embodiment shown in FIG. 3, the angle θ2 formed by the pair of opposing surfaces A1 and A2 forming the slit 52 is an acute angle larger than 0 degree. Therefore, when the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, the gap G between the slit 52 and the elastic member 6 when the elastic member 6 is elastically deformed so as to extend to the introduction chamber 41 side. It becomes easy to form (see FIG. 5C) at an early stage. Thus, the pressure fluid remaining in the output chamber 42 can be discharged to the introduction chamber 41 at an early stage.

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

  Note that, 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 as going from the inside to the outside of the valve member 5 It may be formed.

  In the present embodiment, each of the pair of opposing surfaces A1 and A2 defining the height of the slit 52 linearly extends in a cross section including the central axis A of the valve member 5. In this case, design of the slit 52 and processing for forming the slit 52 are facilitated. Further, 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 can be easily processed.

  In addition, one or both of the pair of facing surfaces A1 and A2 in the slit 52 may not be linear but may be curved.

  In the present embodiment, as shown in FIG. 1, the slit 52 is the inner peripheral surface of the cylinder member 12 for guiding the valve shaft 5A (the inner peripheral surface of the upper hollow portion of the hollow portion of the cylinder member 12 with a smaller inner diameter) 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 offset from the guide portion 43 in the axial direction of the valve member 5 by a length larger than the distance by which the valve member 5 is displaced in the axial direction. Thereby, since the elastic member 6 does not interfere with the guide part 43 at the time of the displacement of the valve member 5, the smoothness of the displacement of the valve member 5 can be maintained.

[Elastic member]
4 (A) is a plan view showing the elastic member 6 in the fluid control valve 2, and FIG. 4 (B) is a cross-sectional view taken along line IV-IV in FIG. 4 (A). 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 a direction toward the central axis A of the valve member 5.

  The elastic member 6 is configured such that a force acts on itself in the direction of closing the communication unit 50 by its own elastic force (contraction force), so the 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 unit 50 can be maintained in the closed state. On the other hand, when the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, it can be elastically deformed to switch the communication unit 50 from the closed state to the open state, so the pressure remaining in the output chamber 42 The fluid can be led to the introduction chamber 41 side and discharged.

  As shown in FIGS. 1 and 4A, in the present embodiment, since the slit 52 and the elastic member 6 are both formed in an annular shape, the elastic force of itself can be obtained simply by arranging the elastic member 6 in the slit 52. The communication portion 50 can be closed by (contraction force). Moreover, since the elastic member 6 is arrange | positioned at the slit 52, 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 it is not limited to this, and may be elliptical as shown in FIG. 4 (C). . In these cases, the elastic member 6 is elastically deformed so as to extend to the introduction chamber 41 side, and then returns to contract to the output chamber 42 side, and even if a portion of the elastic member 6 is twisted Since the cross-sectional shape of the member 6 is circular or elliptical, it is difficult to cause a reduction in the sealing function for closing the communication portion 50.

  6A to 6G are cross-sectional views showing various elastic members 6. The cross-sectional shape of the elastic member 6 is circular in FIG. 6 (A), and the cross-sectional shape of the elastic member 6 is polygonal (specifically square) in FIG. 6 (B), and FIG. 6 (C) 6D, the cross-sectional shape of the elastic member 6 is substantially X-shaped, and in FIG. 6E, the cross-sectional shape of the elastic member 6 is substantially C-shaped. 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 configured by a member having the same specification as the packing 11. The packing 11 is disposed in the groove 58 formed on the outer peripheral surface of the valve stem 5A in order to enhance the sealing performance between the introduction chamber 41 and the output chamber 42 as described above. As described above, since the elastic member 6 is a member having the same specification as the packing 11, an error in assembling the packing 11 and the elastic member 6 does not occur at the time of manufacture, and contributes to cost reduction.

  As a material which comprises the elastic member 6, although a synthetic resin, a metal, etc. can be illustrated, it is preferable to use a synthetic resin from a viewpoint of sealing property etc. 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, fluorocarbon rubber, urethane rubber, fluorocarbon resin, etc. can do. As the fluorinated resin, for example, polytetrafluoroethylene can be exemplified.

[Operation]
5A to 5C are cross-sectional views showing a state in which the elastic member 6 (elastic member 6 having a circular cross section) shown in FIG. 4B is attached to the valve member 5. In FIGS. 5A and 5B, 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 elastic member 6 causes the communicating portion to communicate. It shows that 50 is closed. FIG. 5C shows a state in which the elastic member 6 is elastically deformed to open the communication portion 50 when the pressure in the output chamber 42 is higher than the pressure in the introduction chamber 41.

  When both elastic members 6 shown in FIGS. 5A and 5B are disposed in the slits 52, the elastic members 6 contract in the circumferential direction, so that the slits 52 move in the direction toward the central axis A of the valve member 5. Is designed to exert a force on the The elastic member 6 shown in FIG. 5 (B) has a larger contraction force than the elastic member 6 shown in FIG. 5 (A). As a result, as compared with the elastic member 6 shown in FIG. 5A, the elastic member 6 shown in FIG. It is intruding. Thereby, the sealing property which makes the communication part 50 a closed state can be improved.

  For example, when the pressure fluid in the inlet chamber 41 on the primary side is removed for maintenance etc., even if the passage 40 is closed by the valve member 5, the pressure difference between the inlet chamber 41 and the output chamber 42 is shown in FIG. As shown in FIG. 4, the elastic member 6 is elastically deformed, and a gap G is formed between the elastic member 6 and the inner surface (the facing surface A1 or the facing surface A2) of the slit 52. As a result, the communication unit 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 showing a state in which the elastic member 6 (elastic member 6 having an elliptical cross section) shown in FIG. 4C is attached to the valve member 5. Since FIG.5 (D)-(F) is a figure corresponding to FIG.5 (A)-(C) mentioned above, detailed description is abbreviate | omitted and only difference is demonstrated.

  In FIG. 5D and FIG. 5E, 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 elastic member 6 communicates with the communicating portion. It shows that 50 is closed. FIG. 5F shows a state in which the elastic member 6 is elastically deformed to open the communication portion 50 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 direction of the major axis of the ellipse so as to follow the shape of the slit 52. As compared with the case, the space along the slit 52 can be made easier, and the sealing performance can be improved.

[Summary of the embodiment]
As described above, in the present embodiment, since the elastic member 6 is configured to close the communication portion 50 by its own elastic force, 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 unit 50 can be maintained in the closed state. On the other hand, when the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, it can be elastically deformed to switch the communication unit 50 from the closed state to the open state, so the pressure remaining in the output chamber 42 The fluid can be led to the introduction chamber 41 side and discharged. As described above, in the present 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 pressure in the introduction chamber 41 and the output chamber 42 is reduced. By the pressure difference, the elastic member 6 is elastically deformed to open the communication 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 the present embodiment, it is necessary to provide the valve member 5 and the 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 withdrawn. Compared with the case where a non-return valve is used, it can be configured compactly with few 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 portion 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, the communication portion 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 The passage hole 51 communicates with the slit 52 and opens in the output chamber 42, and the elastic member 6 is formed in an annular shape and disposed in the slit 52.

  In this configuration, the communication part 50 can be closed by its own elastic force only by arranging 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, 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 is provided with a guide portion 43 for guiding a part of the valve member 5 when the valve member 5 is displaced, and the slit 52 is provided at a position 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, a packing 11 is provided between the valve member 5 and the guide portion 43, and the elastic member 6 is formed of a member having the same specification 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, which contributes to cost reduction.

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

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

  In the present embodiment, in a cross section parallel to the axial direction of the valve member 5, each of the pair of opposing surfaces A1 and A2 defining the height of the slit 52 extends linearly. In this case, design of the slit 52 and processing for forming the slit 52 are facilitated.

  In the present 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. Such parallel surfaces are particularly easy to process, and as a result, the entire slit 52 can be easily processed.

  In the present embodiment, the annular elastic member 6 has a circular or elliptical cross section orthogonal to the circumferential direction. In this configuration, after the elastic member 6 is elastically deformed so as to extend to the introduction chamber 41 side, when returning to contract to the output chamber 42 side, even if part of the elastic member 6 is temporarily twisted, the elastic member 6 Since the cross-sectional shape of the cross-sectional shape is a circular shape or an elliptical shape, the decrease in the sealing function for bringing the communication portion 50 into a closed state is unlikely to occur.

  In the present embodiment, the communication unit 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 leading the pressure fluid remaining in the output chamber 42 to the introduction chamber 41 can be increased. Thereby, pressure fluid can be discharged quickly.

  In the present embodiment, the plurality of passage holes 51 are preferably provided at positions symmetrical when the valve member 5 is viewed in the axial direction. In this configuration, for example, when a portion 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. As a result, a path for leading 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 the inner chamber 44 provided inside the valve member 5, and the total cross sectional area of the plurality of passage holes 51 is the most from the opening of the inner chamber 44 to the passage hole 51 It is less than the cross-sectional area in the narrow part. In this configuration, each passage hole 51 can be effectively used 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 axially adjacent to the first inner chamber 44A and the first inner chamber 44A via the step 45, and the first inner chamber 44A The passage hole 51 has a position of the end of the passage hole 51 on the side of the inner chamber 44 relative to the position of the end of the passage hole 51 on the side of the introduction chamber 41. It is preferable to extend from the introduction chamber 41 side to the first inner chamber 44A so as to be far in the axial direction with respect to the step portion 45. In this configuration, the passage hole 51 extends from the side of the introduction chamber 41 to the first inner chamber 44A so as to be axially distant from the step 45, so that the passage hole 51 is between the step 45 and the passage hole 51. It can suppress that the thickness of the valve member 5 which comprises a part becomes thin. Thereby, the strength reduction of the portion between the step 45 and the passage hole 51 can be suppressed.

  In the present embodiment, the passage hole 51 linearly extends 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]
The present invention is not limited to the above-described embodiment, and various changes, improvements, and the like can be made without departing from the scope of the present invention. FIG. 7A to FIG. 9B are cross-sectional views showing an arrangement example of the communication unit 50. FIG. FIG. 10 is a cross-sectional view showing a modification of the valve member 5. 11A and 11B are cross-sectional views showing a modification of the valve member 5.

  In FIG. 7A, the communication portion 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 linearly extending portion and a portion extending while curving may be combined may be employed. The opening on the side of the introduction chamber 41 in the communication portion 50 is provided on the outer peripheral surface of the valve stem 5A of the valve member 5, and the opening on the output chamber 42 side in the communication portion 50 is an inside of the through hole 53 provided on the valve member 5. It is provided on the circumferential surface (specifically, the inner circumferential 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 (central axis A) of the valve member 5. The opening on the side of the introduction chamber 41 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 Specifically, it is provided on the inner circumferential surface that divides 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 side of the introducing chamber 41 in the communicating portion 50 is provided on the outer peripheral surface of the valve shaft 5A of the valve member 5, and the opening on the side of the output chamber 42 in the communicating portion 50 is provided on the end face 55 of the valve body 5B of the valve member 5. It is done.

  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 (central axis A) of the valve member 5. The opening on the side of the introduction chamber 41 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 Specifically, it is provided on the inner circumferential surface that divides the second inner chamber 44B.

  In FIG. 8B, the communication unit 50 has the passage hole 51 and does not have the slit 52. The passage hole 51 extends in a direction perpendicular to the axial direction (central axis A) of the valve member 5. The opening on the side of the introduction chamber 41 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 Specifically, it is provided on the inner circumferential surface that divides the first inner chamber 44A.

  In FIG. 8C, the communication unit 50 has the passage hole 51 and does not have the slit 52. The passage hole 51 extends in a direction perpendicular 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 the communication portion 120 communicating with the communication portion 50 of the valve member 5. The elastic member 6 closes the communication portion 120 of the cylinder member 12 to close the communication portion 50 of the valve member 5.

  In FIG. 9A, the communication unit 50 has the passage hole 51 and does not have the slit 52. The passage hole 51 extends in a direction perpendicular to the axial direction (central axis A) of the valve member 5. The opening on the side of the introduction chamber 41 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 Specifically, it is provided on the inner circumferential surface that divides the first inner chamber 44A.

  In FIG. 9B, the communication portion 50 has the groove 54 and does not have the passage hole 51 and the slit 52. The groove 54 extends in a direction parallel to the axial direction of the valve member 5. An opening on the side of the introduction chamber 41 in the communication portion 50 (groove 54) is provided on the outer peripheral surface of the valve stem 5A of the valve member 5, and an opening on the output chamber 42 side in the communication portion 50 (groove 54) is on the valve member 5 It is provided in the upper end part (The end part on the opposite side to the valve body 5B in 5 A of valve shafts) of 5 A of valve shafts. In FIG. 9B, the groove 54 is formed by a groove provided on the outer peripheral surface of the valve member 5. The number of grooves 54 may be plural or one.

  The valve member 5 shown in FIG. 10 differs from the valve member 5 shown in FIG. 2 in that the height (width) of the slit 52 is substantially constant. In the valve member 5, the angle formed by the pair of opposing 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 the arrangement of the communication portion 50 and the elastic member 6. In FIG. 11A, the communication portion 50 has a passage hole 51 penetrating the valve member 5. The opening on the side of the introduction chamber 41 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 Specifically, it is provided on the inner circumferential surface that divides the first inner chamber 44A.

  In FIG. 11A, the elastic member 6 is not a ring as shown in FIG. 4A, but is, for example, a plate-like member. In FIG. 11A, a plate-like elastic member 6 such as a polygonal plate or a disk is disposed so as to close an opening on the side of the introduction chamber 41 in the communication portion 50. One end (the upper end in FIG. 11A) of the elastic member 6 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 communication portion 50 by its own elastic force, when there is no pressure difference between the introduction chamber 41 and the output chamber 42 as shown in FIG. When the pressure in the introduction chamber 41 is higher than the pressure in the output chamber 42, the communication unit 50 can be maintained in the closed state. On the other hand, as shown in FIG. 11B, when the pressure of the output chamber 42 becomes higher than the pressure of the introduction chamber 41, the other end of the elastic member 6 elastically deforms in the direction away from the valve member 5, A gap G is formed between the elastic member 6 and the communication portion 50. Thus, the communication unit 50 can be switched from the closed state to the 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, it may be a stopper-like form which can block the passage hole 51. As shown in FIG. As a plug-like form, various shapes, such as cylindrical shape and prismatic shape, can be illustrated.

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

Reference Signs List 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 (5)

A body portion in which an introduction chamber into which fluid is introduced from a pressure fluid source, and an output chamber connected to the introduction chamber via a passage;
A valve member that is capable of opening and closing the passage, and in which a communicating portion communicating the introduction chamber and the output chamber is formed;
The communication portion is provided in the communication portion, and the communication portion is closed by its own elastic force, and the pressure of the output chamber is higher than that of the introduction chamber, thereby deforming the communication portion from the closed state. And an elastic member to
The communication portion includes a passage hole provided to extend from the introduction chamber to the output chamber,
The output chamber includes an inner chamber provided inside the valve member,
The inner chamber of the output chamber is
The first inner room,
A second inner chamber adjacent to the first inner chamber in the displacement direction of the valve member via a step portion, and having a larger inner diameter than the first inner chamber;
In the passage hole, the position of the end of the passage hole on the inner chamber side relative to the position of the end of the passage hole on the introduction chamber side is relative to the step portion in the displacement direction of the valve member A fluid control valve extending from the inlet chamber side to the first inner chamber so as to be far away.   The fluid control valve according to claim 1, wherein the communication portion includes a plurality of the passage holes. The fluid control valve according to claim 2 , wherein the plurality of passage holes are provided at positions symmetrical when the valve member is viewed in a direction in which the valve member is displaced. The fluid control valve according to claim 2 or 3 , 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 fluid control valve according to any one of claims 1 to 4 , wherein the passage hole linearly extends from the introduction chamber side to the output chamber.

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