JP2019086011A - Pilot type solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably detect that a spool valve body exists in a valve hole at a position where communication between a supply port and an output port is cut off and communication between an output port and a discharge port is established. To provide a solenoid valve. A pilot solenoid valve (10) includes a position detection switch (50) having a moving member (52) that moves in the axial direction with the movement of a spool valve body (15). The position detection switch 50 performs a switching operation by moving the moving member 52 in the axial direction. The second stroke S2 is larger than the first stroke S1. Then, at the same time that the second spool packing 32 is separated from the second valve seat 22, the position detection switch 50 is switched. [Selection diagram] Fig. 1

Description

  The present invention relates to a pilot solenoid valve.

  For example, as disclosed in Patent Document 1, the body of the pilot type solenoid valve is formed with a valve hole that accommodates the spool valve body in a reciprocating manner. In the body, a supply port, an output port, and a discharge port respectively communicating with the valve hole are formed in this order in the axial direction of the spool valve body. Further, a pilot pressure acting chamber is provided at one end side of the spool valve body in the body. Furthermore, the pilot type solenoid valve includes a pilot valve unit that supplies pilot fluid to the pilot pressure chamber by supplying power to the solenoid unit. Then, by supplying the pilot fluid to the pilot pressure action chamber, the spool valve body moves in the valve hole from one end side to the other end side.

  A first valve seat is provided between the supply port and the output port on the inner peripheral surface of the valve hole, and a second valve seat is provided between the output port and the discharge port. The outer peripheral surface of the spool valve body is provided with a first seal portion which is seated on the first valve seat and seals between the supply port and the output port. Further, on the outer peripheral surface of the spool valve body, there is provided a second seal portion which is seated on the second valve seat and seals between the output port and the discharge port.

  Then, for example, when power is supplied to the solenoid unit and the pilot fluid is supplied to the pilot pressure action chamber by the pilot valve unit, the spool valve moves in the valve hole from one end to the other end. Thus, the first seal part is separated from the first valve seat and the second seal part is seated on the second valve seat. As a result, the supply port and the output port communicate with each other and the communication between the output port and the discharge port is shut off, and the compressed fluid supplied from the supply port is transferred to the fluid pressure device such as an air cylinder through the valve hole and the output port. Supplied.

  Also, for example, when supply of power to the solenoid unit is stopped and supply of pilot fluid to the pilot pressure action chamber by the pilot valve unit is not performed, the spool valve body is in the valve hole from the other end to one end Then, the first seal is seated on the first valve seat and the second seal is separated from the second valve seat. As a result, the communication between the supply port and the output port is cut off and the output port and the discharge port are in communication, and the supply of the compressed fluid from the supply port to the fluid pressure device through the valve hole and the output port is not performed. . Then, the compressed fluid is discharged from the output port to the outside through the valve hole and the discharge port.

JP, 2016-114095, A

  In such a pilot type solenoid valve, if the operator performs maintenance of the fluid pressure device with the compressed fluid remaining in the output port, there is a risk that the fluid pressure device may malfunction during the maintenance, or the compressed fluid may be ejected. Because of the nature, the operator needs to perform maintenance in a state where the compressed fluid is reliably discharged from the output port to the outside through the valve hole and the discharge port. Therefore, it is desirable to reliably detect that the spool valve body is in a position where the communication between the supply port and the output port is interrupted and the output port and the discharge port are in communication in the valve hole. It is rare.

  The present invention has been made to solve the above-mentioned problems, and an object thereof is to block the communication between the supply port and the output port in the valve hole of the spool valve body and to combine the output port and the discharge port. And providing a pilot-type solenoid valve capable of reliably detecting that it is in a position where it is in communication.

  A pilot-type solenoid valve that solves the above problems includes a body, a valve hole formed in the body and accommodating the spool valve body in a reciprocating manner, and the valve hole respectively communicating with the axial direction of the spool valve body The supply port, the output port, and the discharge port formed in the body in this order in this order, the pilot pressure action chamber provided on one end side of the spool valve body in the body, and the supply of power to the solenoid portion A pilot valve portion for supplying a pilot fluid to the pilot pressure acting chamber, a first valve seat provided between the supply port and the output port on an inner peripheral surface of the valve hole, and an inner peripheral surface of the valve hole A second valve seat provided between the output port and the discharge port, and provided on the spool valve body and attached to the first valve seat A first seal for sealing between the supply port and the output port; and a seal between the output port and the discharge port provided on the spool valve body and seated on the second valve seat A pilot type solenoid valve having a second seal portion, the position detection switch having a moving member moving in the axial direction along with the movement of the spool valve body, the position detection switch including the movement The switching operation is performed by moving the member in the axial direction, and the first seal portion is separated from the first valve seat, and the second seal portion is seated on the second valve seat The stroke until the first seal portion is seated on the first valve seat when the spool valve body moves in the direction in which the first seal portion is seated on the first valve seat is a first straw And the second stroke is equal to or greater than the first stroke, and the second seal portion is the second valve seat, where the second stroke portion is a second stroke until the second seal portion separates from the second valve seat. At the same time, the switching operation of the position detection switch is performed.

  In the pilot type solenoid valve, in a state in which the first seal portion is seated on the first valve seat and the second seal portion is separated from the second valve seat, the spool valve body and the movement The spool is separated from the member in the axial direction, the first seal portion is seated on the first valve seat, and the second seal portion is spaced from the second valve seat. The valve body moves in a direction in which the second seal portion is seated on the second valve seat, and the first seal portion separates from the first valve seat, and at the same time, the spool valve body contacts the moving member. It is preferable that the moving member move in accordance with the movement of the spool valve body in the contact state, and the switching operation of the position detection switch is performed.

  According to the present invention, it is reliably detected that the spool valve body is in a position where the communication between the supply port and the output port is shut off and the output port and the discharge port are in communication in the valve hole. A possible pilot-type solenoid valve can be provided.

Sectional drawing of the pilot type solenoid valve in embodiment. Sectional drawing of a pilot type solenoid valve. Sectional drawing of a pilot type solenoid valve. The graph which shows the relationship between the pressure of an output port, the on-off of a position detection switch, and the on-off of a solenoid part.

  Hereinafter, an embodiment in which the pilot type solenoid valve is embodied will be described according to FIGS. 1 to 4. The pilot type solenoid valve supplies a compressed fluid such as compressed air to a fluid pressure device such as an air cylinder to control driving of the fluid pressure device.

  As shown in FIG. 1, FIG. 2 and FIG. 3, the body 11 of the pilot type solenoid valve 10 is a long square block valve body 12 and a first connecting block connected to one end side in the longitudinal direction of the valve body 12 13 and a second connection block 14 connected to the other end of the valve body 12 in the longitudinal direction.

  The valve body 12 is formed with a valve hole 16 that accommodates the spool valve body 15 in a reciprocating manner. The valve body 12 is formed with a supply port 17, an output port 18 and an exhaust port 19. The supply port 17, the output port 18, and the discharge port 19 communicate with the valve hole 16 and are formed in the valve body 12 in this order in the axial direction of the spool valve body 15. The pilot type solenoid valve 10 of the present embodiment is a three-port solenoid valve.

  A first valve seat 21 is provided between the supply port 17 and the output port 18 on the inner peripheral surface of the valve hole 16. A second valve seat 22 is provided between the output port 18 and the discharge port 19 on the inner peripheral surface of the valve hole 16. The first valve seat 21 and the second valve seat 22 have an annular shape that forms a part of the inner peripheral surface of the valve hole 16.

  Further, the valve hole 16 has a first hole 16 a communicating with the supply port 17 and forming one end of the valve hole 16 opposite to the first valve seat 21. Furthermore, the valve hole 16 has a second hole 16 b communicating with the discharge port 19 and forming the other end of the valve hole 16 opposite to the second valve seat 22. The inner diameters of the first valve seat 21, the second valve seat 22, the first hole 16a, and the second hole 16b are the same.

  The spool valve body 15 has a first valve portion 15a, a second valve portion 15b, and a third valve portion 15c which are separated from each other in the axial direction of the spool valve body 15. The first valve portion 15a is disposed in the first hole portion 16a. The second valve portion 15b is disposed in the second hole 16b. The third valve portion 15 c is disposed in the central portion of the valve hole 16 between the supply port 17 and the discharge port 19 in the valve hole 16. The outer diameters of the first valve portion 15a, the second valve portion 15b, and the third valve portion 15c are the same.

  The spool valve body 15 has a first shaft portion 15d connecting the first valve portion 15a and the third valve portion 15c, and a second shaft portion 15e connecting the second valve portion 15b and the third valve portion 15c. have. The outer diameters of the first shaft portion 15d and the second shaft portion 15e are the same. The outer diameters of the first valve portion 15a, the second valve portion 15b, and the third valve portion 15c are larger than the outer diameters of the first shaft portion 15d and the second shaft portion 15e.

  The spool valve body 15 has a columnar first projecting portion 15f which protrudes from an end face of the first valve portion 15a on the opposite side to the first shaft portion 15d. The first protrusion 15 f is an end portion of the spool valve body 15 in the axial direction. Further, the spool valve body 15 has a columnar second projecting portion 15g which protrudes from an end surface of the second valve portion 15b on the opposite side to the second shaft portion 15e. The second protrusion 15 g is the other end of the spool valve body 15 in the axial direction. The outer diameters of the first protrusion 15 f and the second protrusion 15 g are the same. The outer diameters of the first projecting portion 15f and the second projecting portion 15g are smaller than the outer diameters of the first valve portion 15a, the second valve portion 15b, and the third valve portion 15c, and the first shaft portion 15d and the second It is larger than the outer diameter of the shaft portion 15e.

  The spool valve body 15 is provided with a first spool packing 31 as a first seal portion that is seated on the first valve seat 21 and seals between the supply port 17 and the output port 18. The first spool packing 31 is made of an annular rubber and attached to the outer peripheral surface of the third valve portion 15c. The first spool packing 31 is disposed closer to the first shaft portion 15d on the outer peripheral surface of the third valve portion 15c.

  The spool valve body 15 is provided with a second spool packing 32 as a second seal portion which is seated on the second valve seat 22 and seals between the output port 18 and the discharge port 19. The second spool packing 32 is made of an annular rubber and is mounted on the outer peripheral surface of the third valve portion 15c. The second spool packing 32 is disposed closer to the second shaft portion 15e on the outer peripheral surface of the third valve portion 15c.

  The first connection block 13 is formed with a first storage chamber 23 communicating with the first hole 16 a. A plate-like first piston 24 is accommodated in the first accommodation chamber 23 so as to be capable of reciprocating. The first piston 24 is attached to the end face of the first protrusion 15 f of the spool valve body 15. A lip packing 24 a is mounted on the outer peripheral surface of the first piston 24. The lip packing 24 a seals between the first piston 24 and the first storage chamber 23. The pilot pressure acting chamber 25 is divided into the first accommodation chamber 23 by the first piston 24. Therefore, the body 11 has a pilot pressure action chamber 25 provided on one end side of the spool valve body 15 in the body 11.

  In the second connection block 14, a second accommodation chamber 26 communicating with the second hole 16 b is formed. An annular second piston 27 is accommodated in the second accommodation chamber 26 so as to be capable of reciprocating. The second piston 27 is attached to the outer peripheral surface of the second protrusion 15 g of the spool valve body 15. The second projecting portion 15 g penetrates the second piston 27. Further, a biasing spring 28 is accommodated in the second accommodation chamber 26. The biasing spring 28 is disposed around the second protrusion 15 g and is interposed between the second piston 27 and the bottom wall of the second accommodation chamber 26 in the axial direction of the spool valve body 15. The biasing spring 28 biases the second piston 27 toward the first accommodation chamber 23.

  A seal member 29a for sealing between the first valve portion 15a and the first hole portion 16a is mounted on the outer peripheral surface of the first valve portion 15a. The seal member 29a is made of an annular rubber. The seal member 29a restricts the leakage of the compressed fluid from the supply port 17 to the first accommodation chamber 23 via the first hole 16a.

  A seal member 29b is mounted on the outer peripheral surface of the second valve portion 15b to seal between the second valve portion 15b and the second hole 16b. The seal member 29 b is made of an annular rubber. The seal member 29b regulates the leakage of the compressed fluid from the discharge port 19 to the second accommodation chamber 26 via the second hole 16b.

  The pilot type solenoid valve 10 has a pilot valve portion 40. The pilot type solenoid valve 10 of the present embodiment is a so-called single pilot type in which one pilot valve portion 40 is provided. The pilot valve unit 40 includes a solenoid unit 41 that controls a pilot pressure. The pilot valve unit 40 is supplied with power to the solenoid unit 41 and is opened when the solenoid unit 41 is turned on, and the supply of power to the solenoid unit 41 is stopped. It is a well-known solenoid valve closed by turning off.

  The body 11 is formed with a pilot supply flow passage 30 communicating the supply port 17 with the pilot pressure working chamber 25. The pilot valve unit 40 is provided on the pilot supply flow passage 30. Then, when the pilot valve portion 40 is opened, the supply of the compressed fluid (pilot fluid) from the supply port 17 to the pilot pressure working chamber 25 via the pilot supply flow passage 30 is permitted, and the pilot valve portion 40 is closed. When the valve is operated, the supply of the compressed fluid from the supply port 17 to the pilot pressure application chamber 25 via the pilot supply channel 30 is shut off. Thus, the pilot valve unit 40 supplies the pilot fluid to the pilot pressure working chamber 25 by supplying power to the solenoid unit 41. The pilot type solenoid valve 10 of the present embodiment is an internal pilot type that supplies the compressed fluid supplied to the supply port 17 to the pilot pressure chamber 25.

  The pilot type solenoid valve 10 is provided with a position detection switch 50. The position detection switch 50 has a casing 51. The casing 51 is attached to the end face of the second connection block 14 opposite to the valve body 12. A through hole 51 a is formed in an end wall of the casing 51 on the second connection block 14 side.

  The second connection block 14 is formed with a communication hole 14 a for communicating the second accommodation chamber 26 with the through hole 51 a. The tip of the second projecting portion 15 g of the spool valve body 15 is inserted into the communication hole 14 a.

  The position detection switch 50 has a moving member 52 that moves in the axial direction of the spool valve 15 in accordance with the movement of the spool valve 15. The moving member 52 has a columnar shape and extends in the casing 51 in a state in which the axial direction of the moving member 52 coincides with the axial direction of the spool valve body 15. The end of the moving member 52 on the side of the spool valve 15 projects into the communication hole 14a via the through hole 51a. The end face of the moving member 52 on the spool valve body 15 side and the tip end face of the second projecting portion 15 g of the spool valve body 15 can be in contact with each other.

  Two plate-like flanges 53 are provided on the outer peripheral surface of the moving member 52. Both flanges 53 extend in a direction perpendicular to the axial direction of the moving member 52. Movable contacts 54 are respectively provided on the surfaces of the two flanges 53 on the spool valve body 15 side.

  On the inner surface of the casing 51, a support plate 56 having a fixed contact 55 disposed so as to be opposed in the axial direction of the moving member 52 with respect to the movable contact 54 provided on each of the flanges 53 respectively protrudes. The movable contact 54 of each flange 53 is located on the opposite side to the spool valve body 15 with respect to each of the fixed contacts 55 disposed opposite to each other.

  The position detection switch 50 has a switch biasing spring 57 that biases the moving member 52 toward the spool valve body 15. The switch biasing spring 57 is interposed between the end of the moving member 52 opposite to the spool valve body 15 and the bottom wall of the casing 51 in the casing 51. The bottom wall of the casing 51 is a wall located on the opposite side to the end wall in which the through hole 51 a is formed in the casing 51.

  The two movable contacts 54 simultaneously contact the two fixed contacts 55 when the moving member 52 moves toward the spool valve body 15 by the biasing force of the switch biasing spring 57. The position detection switch 50 is turned on by the movement of the movable member 52 toward the spool valve 15 and the two movable contacts 54 coming into contact with the fixed contacts 55, and the movable member 52 is opposite to the spool valve 15. It moves to the side, and both movable contacts 54 are turned off by separating from both fixed contacts 55. Therefore, the position detection switch 50 performs the switching operation by moving the moving member 52 in the axial direction.

  As shown in FIG. 1, from the state where the first spool packing 31 is separated from the first valve seat 21 and the second spool packing 32 is seated on the second valve seat 22, the spool valve body 15 is The stroke until the first spool packing 31 is seated on the first valve seat 21 when the one spool packing 31 moves in the direction of seating on the first valve seat 21 is taken as a first stroke S1. Further, from the state in which the first spool packing 31 is separated from the first valve seat 21 and the second spool packing 32 is seated on the second valve seat 22, the spool valve body 15 has the first spool packing 31. A stroke until the second spool packing 32 separates from the second valve seat 22 when moving in a direction of seating on the first valve seat 21 is taken as a second stroke S2. At this time, the mounting positions of the first spool packing 31 and the second spool packing 32 with respect to the third valve portion 15c and the first valve seat 21 and the second valve seat so that the second stroke S2 becomes larger than the first stroke S1. The formation position of 22 is preset.

  Further, from the state in which the first spool packing 31 is separated from the first valve seat 21 and the second spool packing 32 is seated on the second valve seat 22, the spool valve body 15 has the first spool packing 31. A stroke until both movable contacts 54 contact both fixed contacts 55 when moving in the direction of seating on the first valve seat 21 is a third stroke S3. At this time, the arrangement positions of the movable contacts 54 and the fixed contacts 55, the mounting position of the second spool packing 32 with respect to the third valve portion 15c, and the like so that the second stroke S2 and the third stroke S3 become the same. The formation position of the second valve seat 22 is preset.

  Therefore, when the spool valve body 15 moves in the direction in which the first spool packing 31 is seated on the first valve seat 21, the second spool packing 32 separates from the second valve seat 22 and at the same time both movable contacts 54 both fixed contacts. When the position detection switch 50 is turned on, the position detection switch 50 is turned on. Therefore, the switching operation of the position detection switch 50 is performed simultaneously with the separation of the second spool packing 32 from the second valve seat 22.

  As shown in FIG. 2, from the state where the first spool packing 31 is seated on the first valve seat 21 and the second spool packing 32 is separated from the second valve seat 22, the spool valve body 15 is A stroke until the second spool packing 32 is seated on the second valve seat 22 when the two-spool packing 32 moves in the direction of seating on the second valve seat 22 is a fourth stroke S4. Further, from the state where the first spool packing 31 is seated on the first valve seat 21 and the second spool packing 32 is separated from the second valve seat 22, the spool valve body 15 and the second spool packing 32 A stroke until the first spool packing 31 separates from the first valve seat 21 when moving in a direction of seating on the second valve seat 22 is a fifth stroke S5. At this time, the mounting positions of the first spool packing 31 and the second spool packing 32 with respect to the third valve portion 15c and the first valve seat 21 and the second valve seat so that the fifth stroke S5 becomes larger than the fourth stroke S4. The formation position of 22 is preset.

  Further, in a state where the first spool packing 31 is seated on the first valve seat 21 and the second spool packing 32 is separated from the second valve seat 22, the tip of the second projecting portion 15 g of the spool valve body 15 The surface and the end face of the moving member 52 on the spool valve body 15 side are separated in the axial direction.

  From the state where the first spool packing 31 is seated on the first valve seat 21 and the second spool packing 32 is separated from the second valve seat 22, the spool valve body 15 and the second spool packing 32 are second A stroke until the tip end face of the second protrusion 15g abuts on the end face of the moving member 52 when moving in the direction of seating on the valve seat 22 is a sixth stroke S6. At this time, the mounting position of the first spool packing 31 with respect to the third valve portion 15c and the forming position of the first valve seat 21 so that the sixth stroke S6 is slightly smaller than the fifth stroke S5, and further, both movable The arrangement positions of the contact point 54 and the fixed contacts 55 and the length of the moving member 52 are set in advance.

  Therefore, when the spool valve body 15 moves in the direction in which the second spool packing 32 is seated on the second valve seat 22, the first spool packing 31 separates from the first valve seat 21 and at the same time the tip of the second projection 15 g With the surface in contact with the moving member 52, the moving member 52 moves with the movement of the spool valve body 15, and both the movable contacts 54 separate from the fixed contacts 55. As a result, the position detection switch 50 is turned off. Therefore, the switching operation of the position detection switch 50 is performed simultaneously with the separation of the first spool packing 31 from the first valve seat 21.

Next, the operation of the present embodiment will be described.
When power is supplied to the solenoid unit 41 and the solenoid unit 41 is turned on, the pilot valve unit 40 is opened, and the supply port 17 to the pilot pressure action chamber 25 via the pilot supply flow passage 30 is opened. Supply of compressed fluid is allowed. Then, the pressure in the pilot pressure chamber 25 overcomes the biasing force of the biasing spring 28, and the first piston 24 moves toward the second accommodation chamber 26. Thus, from the state where the first spool packing 31 is seated on the first valve seat 21 and the second spool packing 32 is separated from the second valve seat 22, the spool valve body 15 is engaged with the second spool packing 32. Moves in the direction of seating on the second valve seat 22.

  At this time, as shown in FIG. 2, since the fifth stroke S5 is larger than the fourth stroke S4, when the spool valve body 15 moves for the fifth stroke S5, the first spool packing 31 separates from the first valve seat 21. At the same time, the second spool packing 32 is seated on the second valve seat 22. As a result, the supply port 17 and the output port 18 communicate with each other and the communication between the output port 18 and the discharge port 19 is cut off, and the compressed fluid supplied from the supply port 17 passes through the valve hole 16 and the output port 18 Supplied to pressure equipment.

  Also, the sixth stroke S6 is slightly smaller than the fifth stroke S5. Therefore, the spool valve body 15 moves for the fifth stroke S5, and the first spool packing 31 separates from the first valve seat 21, and at the same time, the tip surface of the second projecting portion 15g abuts on the moving member 52. The moving member 52 is moved along with the movement of the spool valve body 15, the both movable contacts 54 are separated from the both fixed contacts 55, and the position detection switch 50 is turned off. Accordingly, in synchronization with the supply of the compressed fluid supplied from the supply port 17 to the fluid pressure device through the valve hole 16 and the output port 18, the position detection switch 50 is switched from the on state to the off state.

  As shown in FIG. 4, the worker confirms that the solenoid valve 41 is in the ON state and the position detection switch 50 is in the OFF state, and the spool valve body 15 is supplied in the valve hole 16 by confirming P1. It can be reliably detected that the port 17 and the output port 18 communicate with each other and the communication between the output port 18 and the discharge port 19 is in a blocked state.

  When the supply of power to the solenoid unit 41 is stopped and the solenoid unit 41 is turned off, the pilot valve unit 40 is closed, and the supply port 17 to the pilot pressure working chamber 25 via the pilot supply flow passage 30 is closed. The supply of compressed fluid is shut off. Then, the second piston 27 is moved toward the first accommodation chamber 23 by the biasing force of the biasing spring 28. As a result, the first spool packing 31 is separated from the first valve seat 21, and the second spool packing 32 is seated on the second valve seat 22. Moves in the direction of seating on the first valve seat 21.

  At this time, as shown in FIG. 1, since the second stroke S2 is larger than the first stroke S1, when the spool valve body 15 moves by the second stroke S2, as shown in FIG. While being separated from the second valve seat 22, the first spool packing 31 is seated on the first valve seat 21. As a result, the communication between the supply port 17 and the output port 18 is cut off and the output port 18 and the discharge port 19 communicate with each other, and compression from the supply port 17 to the fluid pressure device via the valve hole 16 and the output port 18 The fluid supply will not be performed. Then, the compressed fluid is discharged from the output port 18 to the outside through the valve hole 16 and the discharge port 19.

  Further, since the second stroke S2 and the third stroke S3 are the same, when the spool valve body 15 moves by the second stroke S2, the second spool packing 32 separates from the second valve seat 22 and at the same time, both movable contacts 54 contacts both fixed contacts 55, and the position detection switch 50 is turned on. Accordingly, in synchronization with the discharge of the compressed fluid from the output port 18 to the outside through the valve hole 16 and the discharge port 19, the position detection switch 50 is switched from the off state to the on state.

  As shown in FIG. 4, the worker confirms that the solenoid valve 41 is in the off state and the position detection switch 50 is in the on state, and the spool valve body 15 is supplied in the valve hole 16 by confirming the point P2. It is possible to reliably detect that the communication between the port 17 and the output port 18 is cut off and the output port 18 and the discharge port 19 are in a state of communication.

The following effects can be obtained in the above embodiment.
(1) The switching operation of the position detection switch 50 is performed at the same time when the second stroke S2 is larger than the first stroke S1 and the second spool packing 32 separates from the second valve seat 22. According to this, in the worker, in the valve hole 16, the spool valve body 15 cuts off the communication between the supply port 17 and the output port 18, and the output port 18 and the discharge port 19 communicate with each other. It can be reliably detected that it exists in the position.

  (2) The spool valve body 15 moves in the direction in which the second spool packing 32 is seated on the second valve seat 22 and the first spool packing 31 separates from the first valve seat 21 and at the same time the spool valve body 15 The moving member 52 moves along with the movement of the spool valve body 15 in a state of being in contact with the moving member 52, and the switching operation of the position detection switch 50 is performed. According to this, the worker brings the spool valve body 15 into a state in which the supply port 17 and the output port 18 communicate with each other and the communication between the output port 18 and the discharge port 19 is blocked in the valve hole 16. It is possible to reliably detect the presence of the position.

  (3) If the pilot type solenoid valve 10 of the present embodiment is used, the worker, for example, ensures maintenance of the fluid pressure device by ensuring that the compressed fluid is externally output from the output port 18 through the valve hole 16 and the discharge port 19. It can be done in the discharged state.

The above embodiment may be modified as follows.
In the embodiment, the switching operation of the position detection switch 50 may not be performed at the same time as the first spool packing 31 separates from the first valve seat 21.

In the embodiment, the second stroke S2 may be the same as the first stroke S1. The point is that the second stroke S2 may be equal to or greater than the first stroke S1.
In the embodiment, the fifth stroke S5 may be the same as the fourth stroke S4. The point is that the fifth stroke S5 may be equal to or greater than the fourth stroke S4.

  In the embodiment, at the same time when the second spool packing 32 separates from the second valve seat 22, both movable contacts 54 separate from both fixed contacts 55, and the position detection switch 50 is turned off. It may be a configuration.

  In the embodiment, at the same time when the first spool packing 31 separates from the first valve seat 21, both movable contacts 54 contact both fixed contacts 55, and the position detection switch 50 is turned on. It may be a configuration.

  In the embodiment, the first seal portion does not use the first spool packing 31 which is a separate member from the spool valve body 15, and for example, even if a part of the third valve portion 15c is the first seal portion Good.

  In the embodiment, for example, even if a portion of the third valve portion 15c is a second seal portion, the second seal portion does not use the second spool packing 32 which is a separate member from the spool valve body 15 as the second seal portion. Good.

  In the embodiment, the valve body 12 may have two output ports and two exhaust ports. In short, in the pilot type solenoid valve 10, in the axial direction of the spool valve body 15, the first discharge port, the first output port, the supply port, the second output port, and the second discharge port are arranged in this order. It may be a 5-port solenoid valve formed in

In the embodiment, the specific configuration of the position detection switch 50 is not particularly limited. For example, a proximity switch or a photoelectric sensor may be used.
In the embodiment, an external pilot system may be used to supply the pilot pressure chamber 25 with an externally supplied compressed fluid other than the supply port 17.

  In the embodiment, the pilot type solenoid valve 10 may be a so-called double pilot type in which the pair of pilot valve portions 40 are mounted.

  DESCRIPTION OF SYMBOLS 10 ... Pilot type solenoid valve, 11 ... Body, 15 ... Spool valve body, 16 ... Valve hole, 17 ... Supply port, 18 ... Output port, 19 ... Discharge port, 21 ... 1st valve seat, 22 ... 2nd valve seat 31: first spool packing as a first seal portion 32: second spool packing as a second seal portion 25: pilot pressure acting chamber 40: pilot valve portion 41: solenoid portion 50: position detection switch , 52 ... moving member.

Claims (2)

Body and
A valve hole formed in the body and reciprocably accommodating a spool valve body;
A supply port, an output port, and a discharge port which are respectively communicated with the valve hole and formed in the body in this order in the axial direction of the spool valve body;
A pilot pressure action chamber provided on one end side of the spool valve body in the body;
A pilot valve unit for supplying a pilot fluid to the pilot pressure chamber by supplying power to a solenoid unit;
A first valve seat provided between the supply port and the output port on an inner circumferential surface of the valve hole;
A second valve seat provided between the output port and the discharge port on an inner circumferential surface of the valve hole;
A first seal portion provided on the spool valve body and seated on the first valve seat to seal between the supply port and the output port;
A pilot type solenoid valve comprising a second seal portion provided on the spool valve body and seated on the second valve seat to seal between the output port and the discharge port.
A position detection switch having a moving member that moves in the axial direction along with the movement of the spool valve body,
The position detection switch performs a switching operation by moving the moving member in the axial direction,
From the state in which the first seal portion is separated from the first valve seat and the second seal portion is seated on the second valve seat, the spool valve body is configured to receive the first seal portion. (1) The stroke until the first seal portion is seated on the first valve seat when moving in the direction of seating on the valve seat is taken as the first stroke, and the second seal portion is separated from the second valve seat The second stroke is equal to or greater than the first stroke, where the second stroke is a second stroke.
The pilot type solenoid valve characterized in that the switching operation of the position detection switch is performed at the same time when the second seal portion is separated from the second valve seat. In a state where the first seal portion is seated on the first valve seat and the second seal portion is separated from the second valve seat, the spool valve body and the moving member are in the axial direction. Separated,
From the state in which the first seal portion is seated on the first valve seat and the second seal portion is separated from the second valve seat, the spool valve body is configured to receive the second seal portion. (2) The moving member moves in the direction of seating on the valve seat, and at the same time the first seal portion separates from the first valve seat, the moving member is the spool valve in a state where the spool valve body abuts on the moving member The pilot type solenoid valve according to claim 1, wherein the pilot position solenoid switch is moved according to the movement of the position detection switch.