JP2020159482A - Pilot relay - Google Patents

Abstract

To provide a pilot relay configured on the basis of an idea of fail-safe.SOLUTION: A pilot relay 1 includes: a housing 10 in which an input air pressure chamber 11, a supply air pressure chamber 12, an output air pressure chamber 13, and an exhaust chamber 14 are formed; a diaphragm 20 which operates according to an input air pressure Pn applied to the input air pressure chamber 11 and a driving body 30 which operates in conjunction with the diaphragm 20; a poppet valve 40 which switches a passage; a spring 50 which biases the poppet valve 40; and a stopper mechanism which prevents an air supply valve part 42 included in the poppet valve 40 from moving from a predetermined position in a direction of biasing by the spring 50.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pilot relay used in a valve positioner or the like that controls the opening degree of an air-operated control valve.

Conventionally, valve positioners have been widely used in valve drive control of process automation and other general industrial equipment.

FIG. 10 is a diagram showing an outline of a general valve positioner VP. The valve positioner VP has an electropneumatic conversion unit EN that converts a valve opening signal sent as an electric signal from the host controller CTL into an air pressure signal Pn, and an electropneumatic conversion unit EN that amplifies this input air pressure Pn and outputs the valve VAL as an output air pressure signal. It is composed of a pilot relay (pressure signal amplifier) PR that outputs the output air pressure Po.

In the pilot relay PR, the drive body is displaced by receiving the input air pressure Pn by the pressure receiving plate, and the drive body and the valve (for example, a poppet valve) are separated from each other or come into contact with each other (pressure contact) to perform the air supply mode and exhaust. It is a device that amplifies the input air pressure Pn to the output air pressure Po at a predetermined ratio by switching between modes and adjusting the fluid flow rate in each mode according to the displacement stroke of the drive body.

The pilot relay PR includes a single-acting type that outputs one output air pressure Po for one input air pressure Pn and a double-acting type that outputs two output air pressures Po1 and Po2 for one input air pressure Pn. Exists. Among these, as an example of the single-acting pilot relay, for example, there is a pilot relay 100 disclosed by Patent Document 1 as shown in FIGS. 11 and 12.

The pilot relay 100 is arranged so as to define the lower surface of the input pneumatic chamber 108, the supply pneumatic chamber 105, the output pneumatic chamber 106 and the exhaust chamber 107 formed in the housing 101, and the input pneumatic chamber 108. Communication / non-communication between the diaphragm 102 of 1, the drive body 130 coupled to the first diaphragm 102, the second diaphragm 103, the supply air pressure chamber 105 and the output air pressure chamber 106, and the output air pressure chamber 106 and the exhaust chamber 107. It is provided with a poppet valve 112 for switching between the two, and a spring 113 for urging the poppet valve 112 in a predetermined direction. Here, the supply air pressure chamber 105 and the output air pressure chamber 106 are defined by a partition wall 104 which is a part of the inner wall of the housing 101, and a communication passage 110 is opened in the partition wall 104.

The first diaphragm 102 is a functional element that receives the input air pressure Pn applied to the input air pressure chamber 108 and displaces it in the directions of arrows A and B in FIGS. 11 and 12 according to the value thereof, and is coupled. The drive body 130 is also configured to be displaced (moved) in conjunction with this.
The second diaphragm 103 is an element that supports the drive body 130 so as to be displaceable (movable) and defines the output pneumatic chamber 106 and the exhaust chamber 107, and is installed between the housing 101 and the drive body 130. Has been done.
The drive body 130 is a moving element including an exhaust passage 115 that communicates the output pneumatic chamber 106 and the exhaust chamber 107, and has a function of pressing the poppet valve 112 through an opening 130a facing the output pneumatic chamber 106 to drive the poppet valve 112. It is also a target element.
The poppet valve 112 is a valve body integrally including an exhaust valve body 112a arranged to face the opening 130a, an opening on the supply air pressure chamber 105 side of the communication passage 110, and an air supply valve body 112b arranged to face each other, and is a spring. The air supply valve body 112b is urged by 113 in the direction of closing the communication passage 110, and is movably inserted into the communication passage 110 along the hole axis.

In the pilot relay 100 having the above configuration, the air having the supply air pressure Ps is supplied to the supply air pressure chamber 105 through the air supply passage 109, and the air having the input air pressure Pn is introduced into the input air pressure chamber 108 through the nozzle back pressure introduction pipe 117. Further, the air adjusted to the output air pressure Po (amplified with respect to the input air pressure Pn) in the output air pressure chamber 106 is arranged downstream from the output air pressure chamber 106 through the output air hole 111 (for example, the valve VAL). ) Is output. The exhaust chamber 107 communicates with the atmosphere.

When the input air pressure Pn increases in the pilot relay 100 having the above configuration, as shown in FIG. 11, the first diaphragm 102 and the second diaphragm 103 move in the direction of the arrow A, and the first diaphragm accordingly. The drive body 130 supported by the 102 and the second diaphragm 103 also moves in the direction of arrow A. Then, the drive body 130 pushes down the poppet valve 112 against the urging force of the spring 113 with this movement. At this time, the air supply valve body 112b of the poppet valve 112 opens the communication passage 110, and the exhaust valve body 112a of the poppet valve 112 closes the opening 130a. As a result, the air of the supply air pressure Ps supplied to the supply air pressure chamber 105 is guided to the output air pressure chamber 106 through the communication passage 110, and then adjusted to the output air pressure Po in the output air pressure chamber 106 (to the input air pressure Pn). The air supply mode is configured such that the air is amplified) and then supplied to a device (for example, the valve VAL) disposed downstream through the output air hole 111.

On the other hand, when the input air pressure Pn decreases in the pilot relay 100 having the above configuration, as shown in FIG. 12, the first diaphragm 102 and the second diaphragm 103 move in the direction of the arrow B, and accordingly, the first diaphragm 102 and the second diaphragm 103 move in the direction of the arrow B. The drive body 130 supported by the first and second diaphragms 102 and 103 also moves in the direction of arrow B. Then, the poppet valve 112 is pushed up by the urging force of the spring 113. At this time, the air supply valve body 112b of the poppet valve 112 closes the communication passage 110, and the exhaust valve body 112a of the poppet valve 112 opens the opening 130a. As a result, an exhaust mode is configured in which the air in the output air pressure chamber 106 is guided to the exhaust chamber 107 through the opening 130a and the exhaust passage 115 provided in the drive body 130, and then discharged to the outside air. To.

In this way, the pilot relay 100 adjusts (amplifies) the output air pressure to a desired pressure while appropriately switching between the supply air mode and the exhaust mode according to the change in the input air pressure Pn guided to the supply air pressure chamber 105. Po is output to a device (for example, the valve VAL) arranged downstream through the output air hole 111. The output air pressure Po is adjusted by adjusting the value of the input air pressure Pn.

Jitsufuku 7-23601 Gazette

In the pilot relay 100 having the above configuration, the poppet valve 112 repeats the above operation, so that the air supply valve body 112b included in the poppet valve 112 and the partition wall 104 facing the air supply valve body 112b collide with each other each time. At this time, for example, the air supply valve body 112b having a high surface hardness made of a forged product made of stainless steel attacks and scrapes the partition wall 104 having a low surface hardness made of a cast product made of an aluminum alloy, and gradually cuts the diameter of the communication passage 110. Expands. When the cutting allowance of the partition wall 104 becomes large, the poppet valve 112 gradually moves upward in the direction of the arrow B in FIG. 12 due to the urging force of the spring 113, and pushes up the abutting drive body 130. When the drive body 130 is pushed up to a position where it cannot move upward any more, for example, by contacting the inner wall of the housing, and then a large force due to vibration or the like is applied from the outside, as shown in FIG. 13, the poppet valve 112 An abnormal state may occur in which the exhaust valve body 112a provided on the upper portion fits into the opening 130a of the opposing drive body 130 and closes the opening 130a. In such an abnormal state, not only the pilot relay 100 cannot be controlled properly because the exhaust mode does not function, but also the air pressurized from the valve positioner VP can be exhausted to the atmosphere even if the supply pressure is cut off. I can't. Therefore, even after the pilot relay 100 is urgently stopped, an abnormal situation occurs in which high pressure air remains in the equipment for a while. Such an abnormal situation can be said to be an undesired state for the pilot relay 100 because an unexpectedly excessive load is applied.

The present invention has been created in view of the above problems, and an object of the present invention is to provide a structure that guides a pilot relay and a device including the pilot relay to a safe state when the above abnormal state occurs, so-called fail-safe. The purpose is to provide a pilot relay with an idea-based structure.

The pilot relay according to the present invention has an internal space, and has a first through hole (11a), a second through hole (12a), a third through hole (13a), and a fourth through hole (14a). A housing (10) having a housing (10), and a partition wall provided in the housing and having a first communication hole (16) for separating the internal space in the housing into two spaces and communicating the two spaces. A drive having a diaphragm (20) supported by the inner wall of the housing so as to be displaceable in a predetermined direction, and a second communication hole (36) supported by the diaphragm and moved in the housing in the predetermined direction. It has a body (30), a first valve body (42) that opens and closes the first communication hole, and a second valve body (41) that opens and closes the second communication hole, and the first communication. A poppet valve (40) inserted into the hole and an urging member (50) for urging the poppet valve in a direction in which the first valve body closes the first communication hole are provided in the housing. Is defined by the inner wall of the housing and the diaphragm, and the input pneumatic chamber (11) into which air of the input air pressure (Pn) is introduced through the first through hole, and the inner wall of the housing including the partition wall. The first is defined by a supply air pressure chamber (12), which is defined and air of supply air pressure (Ps) is supplied through the second through hole, an inner wall of the housing including the partition wall, and the drive body. The output pneumatic chamber (13) that communicates with the supply pneumatic chamber through the communication hole (16) of 1 and outputs the air of the output pneumatic (Po) to the outside through the third through hole, and the inner wall of the housing. An exhaust chamber (14) defined by the diaphragm and the driving body, communicating with the output pneumatic chamber through the second communication hole, and discharging the internal air to the outside through the fourth through hole. The pilot relay (1) in which the poppet valve is formed is further provided with stopper mechanisms (15a, 44) for restricting the movement of the poppet valve from a predetermined position in the urging direction by the urging member.

Further, in the pilot relay, the second valve body of the poppet valve whose movement is restricted by the stopper mechanism when the input air pressure introduced into the input air pressure chamber is the minimum at the predetermined position. May be configured so as not to close the second communication hole.

Further, in the pilot relay, the stopper mechanism is provided on the poppet valve, and when the poppet valve is in the predetermined position, the contact is configured to abut on the inner wall of the housing including the partition wall. It may be configured to include the member (44).

Further, in the pilot relay, the contact member is provided on the poppet valve and projects in a direction orthogonal to the urging direction to form a wall surface portion of the partition wall on the supply pneumatic chamber side. It may be configured to include an overhang member (44) configured to abut.

Further, in the pilot relay, at least a part of the peripheral edge of the overhanging member is located outside the opening of the first communication hole, and is located on the side opposite to the urging direction with respect to the wall surface portion. It may be configured to do so.

Further, in the pilot relay, the surface facing the wall surface portion and the overhanging member exhibits an annular shape, and the outer peripheral diameter of the overhanging member is larger than the inner peripheral diameter of the wall surface portion. You may.

Further, in the pilot relay, the overhanging member may be configured to project from one end of the poppet valve on the side where the first valve body is provided.

Further, in the pilot relay, the stopper mechanism includes a concave portion (15b) provided in the wall surface portion of the supply pneumatic chamber, and the protruding member engages with at least a part of the concave portion (a convex portion (15b). 45) may be configured to have.

Further, in the pilot relay, the stopper mechanism is arranged between the inner wall of the housing including the partition wall and any one of the driving bodies and the poppet valve, and the urging direction of the urging member. The elastic force of the elastic member including the elastic member (46) that urges the poppet valve in the opposite direction when the poppet valve is in the predetermined position is when the poppet valve is in the predetermined position. It may be configured to be larger than the urging force of the urging member.

Further, in the pilot relay, the stopper mechanism is a columnar member (44) provided on the poppet valve that linearly extends from the top of the second valve body to the inside of the second communication hole of the drive body. -4) may be included, and the elastic member may be arranged between the tip end portion of the columnar member and the inner wall surface (36a) of the second communication hole of the drive body.

In the above description, as an example, reference numerals on drawings corresponding to the components of the invention are described in parentheses.

According to the present invention, the first valve body (42) gradually cuts the facing partition wall (15) to form the first communication hole (16), more specifically, the first communication hole (16). Even if the diameter of the minimum opening diameter expands, the movement of the poppet valve (40) is restricted at a predetermined position by the action of the stopper mechanism, and the air inside the device is secured by securing the exhaust path. It is configured to be discharged to the outside. This makes it possible to provide a pilot relay (1) based on the so-called fail-safe concept.

FIG. 1 is a cross-sectional view of a pilot relay (air supply mode) according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a pilot relay (exhaust mode) according to an embodiment of the present invention. FIG. 3 is a perspective view of a poppet valve according to an embodiment provided in the pilot relay according to the embodiment of the present invention. FIG. 4 is a perspective view of a poppet valve according to another embodiment provided in the pilot relay according to the embodiment of the present invention. FIG. 5 is a cross-sectional view of a pilot relay (abnormal mode) according to the embodiment of the present invention. FIG. 6 is a perspective view of a poppet valve according to another embodiment provided in the pilot relay according to the embodiment of the present invention. FIG. 7 is a cross-sectional view of a pilot relay (abnormal mode) according to the embodiment of the present invention. FIG. 8 is a perspective view of a poppet valve according to another embodiment provided in the pilot relay according to the embodiment of the present invention. FIG. 9 is a cross-sectional view of a pilot relay (abnormal mode) according to the embodiment of the present invention. FIG. 10 is a structural diagram of a main part of a valve positioner using a pilot relay. FIG. 11 is a cross-sectional view of a pilot relay (air supply mode) according to a conventional embodiment. FIG. 13 is a cross-sectional view of a pilot relay (exhaust mode) according to a conventional embodiment. FIG. 13 is a cross-sectional view of a pilot relay (abnormal mode) according to a conventional embodiment.

An embodiment of the pilot relay 1 according to the present invention will be described with reference to FIGS. 1 to 9. The vertical direction, the horizontal direction, and the front-rear direction in the description are defined as the vertical direction, the horizontal direction, and the direction perpendicular to the paper surface of the pilot relay 1 shown in FIG. 1, respectively.

[Pilot relay configuration]
First, the configuration of the pilot relay 1 according to the present embodiment will be described with reference to FIG. A part of these configurations overlaps with the configuration of the pilot relay 100 described above, but these overlapping portions will be described again.

As shown in FIG. 1, the pilot relay 1 is mainly composed of a housing 10, a first diaphragm 20, a second diaphragm 21, a third diaphragm 22, a drive body 30, a poppet valve 40, and a spring 50.

The housing 10 is made of, for example, a cast product made of an aluminum alloy, and an input pneumatic chamber 11, a supply pneumatic chamber 12, and an output pneumatic chamber 13 are formed therein, respectively. Further, the lower surface of the input pneumatic chamber 11 is defined by the first diaphragm 20, and a space in which the second diaphragm 21, the third diaphragm 22 and the driving body 30 are housed is formed below the first diaphragm 20. More specifically, the exhaust chamber 14 is formed in this space, which is defined by the lower surface of the first diaphragm 20, the upper surface of the second diaphragm 21, and the inner wall of the housing 10.

The input pneumatic chamber 11 is a space defined by the inner wall of the housing 10 and the first diaphragm 20 (more specifically, the upper surface of the first diaphragm 20) described in detail later, and is the most in the housing 10. It is located at the top. The input pneumatic chamber 11 back pressure is applied to the first diaphragm 20 by using the air of the input air pressure Pn introduced through the nozzle back pressure introduction pipe 11a (corresponding to the “first through hole” described in the claims). It is a space provided for hanging.

The supply pneumatic chamber 12 is a space defined by the inner wall of the housing 10 including the partition wall 15 (more specifically, the lower surface of the partition wall 15), is located at the lowermost part of the housing 10, and opens to the partition wall 15. The communication hole 16 (corresponding to the “first communication hole” described in the claims) communicates with the output pneumatic chamber 13 described in detail later. Air for amplifying the input air pressure Pn (air of the supply air pressure Ps) is supplied to the supply air pressure chamber 12 through the air supply passage 12a (corresponding to the “second through hole” described in the claims). Will be done.

The output pneumatic chamber 13 is a space defined by the inner wall of the housing 10 including the partition wall 15 (more specifically, the upper surface of the partition wall 15), the drive body 30, and the third diaphragm 22, and is an intermediate portion in the housing 10. More specifically, it is located between the exhaust chamber 14 and the supply air pressure chamber 12. The output air pressure chamber 13 adjusts (amplifies at a predetermined ratio) the supply air pressure Ps of the air supplied to the supply air pressure chamber 12 according to the value of the input air pressure Pn, and adjusts the air of the adjusted output air pressure Po. It is a space for outputting to a device (for example, the valve VAL) arranged downstream through the output air hole 13a (corresponding to the “third through hole” described in the claims).

As described above, the output air pressure chamber 13 communicates with the supply air pressure chamber 12 through the communication hole 16 opening in the partition wall 15, and also communicates with the exhaust chamber 14 through the exhaust passage 36. The communication state between these two chambers is the vertical movement of the first diaphragm 20 and the drive body 30 interlocking with the first diaphragm 20 (movement in the directions of arrows A and B in FIG. 1), and the poppet described in detail later. It is configured so that communication / non-communication can be switched by the vertical movement of the valve 40.

In the space formed below the input pneumatic chamber 11, a drive body 30, which will be described in detail later, is arranged so as to be coupled to the lower surface of the first diaphragm 20. Further, the second diaphragm 21 and the third diaphragm 22, which will be described in detail later, are arranged so as to connect the outer peripheral edge of the drive body 30 and the inner wall of the housing 10. In this space, as described above, the exhaust chamber 14 defined by the inner wall of the housing 10 and the first diaphragm 20 and the second diaphragm 21 is formed. The exhaust chamber 14 discharges air (air of output air pressure Po) from the output air pressure chamber 13 to the outside through an exhaust passage 14a (corresponding to the “fourth through hole” described in the claims) communicating with the outside air. It is a space for communicating with the output pneumatic chamber 13 through an exhaust passage 36 (corresponding to the “second communication hole” described in the claims) provided in the drive body 30 described in detail later. There is.
The second diaphragm 21 can be omitted as necessary, as will be described later. When the second diaphragm 21 is omitted, the exhaust chamber 14 is defined by the inner wall of the housing 10, the first diaphragm 20, and the third diaphragm 22.

As described above, in the pilot relay 1 according to the present embodiment, the input air pressure chamber 11, the exhaust chamber 14, the output air pressure chamber 13, and the supply air pressure chamber 12 are arranged in this order from the top. Further, a first diaphragm 20 is interposed between the input air pressure chamber 11 and the exhaust chamber 14, and a second diaphragm 21, a third diaphragm 22 and an exhaust passage 36 are provided between the exhaust chamber 14 and the output air pressure chamber 13. The drive body 30 is interposed, and a partition wall 15 having a communication hole 16 is interposed between the output air pressure chamber 13 and the supply air pressure chamber 12. Further, the poppet valve 40, which will be described in detail later, is arranged below the drive body 30, so that the two valve bodies (exhaust valve body 41 and air supply valve body 42, which will be described later) move up and down in the communication hole 16. Have been placed. In addition, these arrangements may be changed as needed.

As described above, the communication hole 16 that communicates the supply air pressure chamber 12 and the output air pressure chamber 13 is a substantially cylindrical hole that opens into the partition wall 15 that forms a part of the inner wall of the housing 10, for example, the inside. The intermediate portion is provided with a minimum opening diameter portion 16a projecting to.

Further, the nozzle back pressure introduction pipe 11a communicating with the input air pressure chamber 11, the air supply passage 12a, the output air hole 13a communicating with the output air pressure chamber 13, and the discharge passage 14a communicating with the exhaust chamber 14 are the outer peripheral surfaces of the housing 10, respectively. Of these, the nozzle back pressure introduction pipe 11a, the air supply passage 12a, and the output pneumatic chamber 13 are provided with pipes for connecting to a predetermined device or the like.

As described above, the first diaphragm 20 is an element that receives the input air pressure Pn as the back pressure by the air introduced into the input air pressure chamber 11, and the arrow A in FIG. 1 depends on the value of the input air pressure Pn. Alternatively, it has a function of moving up and down in the direction of B and transmitting this movement to the driving body 30 to be coupled. The first diaphragm 20 is made of a flexible material such as nitrile rubber, and its outer peripheral edge is supported by the inner wall of the housing 10.

The second diaphragm 21 and the third diaphragm 22 both support the drive body 30 together with the first diaphragm 20, and the inner wall of the housing 10 and the drive body 30 have a sealing property so that the exhaust chamber 14 is formed. It is an element arranged so as to be relatively movable. These two elements are made of a flexible material such as a nitrile rubber having an annular shape with an opening in the center, and the outer peripheral edge thereof is the same as that of the first diaphragm 20, both of which are of the housing 10. It is supported by the inner wall.

The second diaphragm 21 and the third diaphragm 22 having substantially the same function may be integrated into one element, if necessary. Further, instead of the structure provided with these elements, for example, a structure in which the inner wall of the housing 10 and the drive body 30 slide via a seal ring may be used.

The drive body 30 is a functional element that moves (displaces) in conjunction with the vertical movement of the first diaphragm 20 and transmits the vertical movement to the poppet valve 40 to drive the poppet valve 40. The drive body 30 includes an area plate 31, an inner member 32, and a valve seat 33 as main components, and is configured such that these elements are stacked.

The area plate 31 is an element forming the upper part of the driving body 30, and is formed of a disk-shaped portion and a cylindrical portion.
The disk-shaped portion is coupled to the lower surface of the first diaphragm 20, whereby the driving body 30 is supported by the first diaphragm 20.
The cylindrical portion is a portion located below the disk-shaped portion, and a cylindrical hole with an opening on the output pneumatic chamber 13 side extends vertically in the center thereof, and a passage extending horizontally from this hole. Is formed. The circular pipe portion of the valve seat 33, which will be described later, is fitted into the hole, and the passage forms an exhaust passage 36 together with the inner space of the circular pipe portion of the valve seat 33.

An inner member 32 having a substantially truncated cone shape is arranged below the area plate 31. The inner member 32 sandwiches the inner peripheral edge portion of the second diaphragm 21 between the upper surface thereof and the lower surface of the area plate 31, and the inner peripheral edge portion of the third diaphragm 22 is sandwiched between the lower surface thereof and the upper surface of the flange portion of the valve seat 33 described later. I'm holding it. Further, a through hole is opened substantially in the center of the inner member 32, and the circular tube portion of the valve seat 33 is fitted into the through hole.

The valve seat 33 arranged at the lowermost portion of the drive body 30 is composed of a circular tube portion extending vertically and a flange portion extending horizontally from the lower end portion of the circular tube portion. The circular tube portion is configured to be integrated with these elements by, for example, being press-fitted into the through holes formed in the area plate 31 and the inner member 32. Further, as described above, the internal space of the circular pipe portion forms an exhaust passage 36 that communicates the output pneumatic chamber 13 and the exhaust chamber 14 together with the passage formed in the cylindrical portion of the area plate 31. The peripheral edge of the lower end forms an output side opening 37 that communicates with the output pneumatic chamber 13.

The poppet valve 40 has an operation mode in which air having a supply air pressure Ps is guided from the supply air pressure chamber 12 to an output air pressure chamber 13 (hereinafter referred to as “air supply mode”) and air having an output air pressure Po is exhausted from the output air pressure chamber 13. It is an element for switching between an operation mode for guiding to the chamber 14 (hereinafter, referred to as “exhaust mode”), and is formed of, for example, a forged product made of stainless steel. As described above, the poppet valve 40 is located below the drive body 30 (on the supply air pressure chamber 12 side), and a part of the poppet valve 40 is vertically and vertically fitted into the communication hole 16 that opens in the partition wall 15. There is.

As shown in FIG. 3, the poppet valve 40 has a cylindrical shape, and has a dome-shaped exhaust valve body 41 arranged at the top (in the "second valve body" described in the claims. (Equivalent), a cylindrical air supply valve body 42 (corresponding to the "first valve body" described in the claims) disposed at the bottom, and a constricted portion 43 interposed between these two parts. And an overhanging portion 44 (corresponding to the "contact member" and the "overhanging member" described in the claims).

The exhaust valve body 41 is a portion that is vertically movablely fitted in the communication hole 16 that opens in the partition wall 15, and by opening the output side opening 37 of the drive body 30 in the exhaust mode, the exhaust valve body 41 and the output pneumatic chamber 13 This is a functional portion in which the exhaust chamber 14 is in a communicative state and the output air pressure chamber 13 and the exhaust chamber 14 are in a non-communication state by closing the output side opening 37 in the air supply mode. Therefore, the diameter of the exhaust valve body 41 is set to be smaller than the diameter of the minimum opening diameter 16a of the communication hole 16 opening in the partition wall 15 and larger than the diameter of the output side opening 37 opening to the drive body 30. ing.

The air supply valve body 42 is a portion located below the minimum opening diameter portion 16a, that is, on the supply air pressure chamber 12 side, and the output air pressure is obtained by closing the communication hole 16 that opens in the partition wall 15 in the exhaust mode. This is a functional portion in which the chamber 13 and the supply air pressure chamber 12 are in a non-communication state, and the output air pressure chamber 13 and the supply air pressure chamber 12 are in a communication state by opening the communication hole 16 in the air supply mode. Therefore, the diameter of the air supply valve body 42 is set to be larger than the diameter of the minimum opening diameter portion 16a.

The constricted portion 43, together with the exhaust valve body 41, is a portion that is vertically and vertically movablely fitted into the communication hole 16, and has a diameter that communicates with the communication hole 16 in order to form a flow path in the air supply mode. It is set smaller than the diameter of the minimum opening diameter portion 16a of the hole 16.

The overhanging portion 44 is formed on the lower end surface of the air supply valve body 42, that is, on the surface facing the output pneumatic chamber 13. The overhanging portion 44 is below the wall surface portion 15a formed by a part of the partition wall 15 defining the supply air pressure chamber 12, and more specifically, the supply air pressure chamber of the communication hole 16 opening in the partition wall 15. It is located below the wall surface portion 15a forming the peripheral edge portion of the 12-side opening (that is, on the supply air pressure chamber 12 side).
Further, the overhanging portion 44 has a disk shape extending in a horizontal plane, and the position where the poppet valve 40 comes into contact with the air supply valve body 42 and the minimum opening diameter portion 16a of the communication hole 16 in the abnormal mode described later (hereinafter, , "Normal position") and further moved upward by a predetermined distance in the direction of arrow A in FIG. 1 (corresponding to the "predetermined position" described in the claims) with the wall surface portion 15a. It has a diameter larger than this opening diameter so as to abut and close the supply air pressure chamber 12 side opening. Therefore, the overhanging portion 44 and the wall surface portion 15a are separated from each other in the vertical direction by the predetermined distance when the poppet valve 40 is in the normal position.

Here, the positions moved upward by a predetermined distance are the wall surface portion 15a and the overhanging portion 44 when the input air pressure Ps introduced into the input air pressure chamber 11 is the minimum (for example, when the input air pressure Ps is zero). The poppet valve 40 (more specifically, the exhaust valve body 41 included in the poppet valve 40) whose movement in the direction in which the spring 50 is urged is restricted by the stopper mechanism composed of the above does not close the exhaust passage 36. Means the position set as. This position is synonymous with the regulated position described later.

Further, the predetermined distance is, for example, a distance that the drive body 30 moves with the displacement of the first diaphragm 20 when the air supply valve body 42 is in a state of closing the communication hole 16, that is, air supply. From the state α in which the valve body 42 closes the communication hole 16 and the exhaust valve body 41 closes the exhaust passage 36, the air supply valve body 42 closes the communication hole 16 and the exhaust valve body 41 and the exhaust passage 36 are the most. It is defined as a distance smaller than the distance that the driving body 30 moves before reaching the separated state β (hereinafter, referred to as “moving distance of the driving body 30 when the air supply valve body 42 is closed”). Here, the above-mentioned state α is synonymous with the “equilibrium state” described later. Further, in the state β, for example, when the input air pressure Ps is zero, the first diaphragm 20 supporting the drive body 30 abuts on the inner wall surface of the housing 10, and the drive body 30 may move further upward. This is a state in which it cannot be done (see Fig. 5). Therefore, the position of the drive body 30 in the state β corresponds to, for example, a physically regulated upper limit position.

The spring 50 is an element that urges the poppet valve 40 toward the output side opening 37 that opens to the drive body 30, and is formed of, for example, a coil spring made of stainless steel wire. The lower end surface of the spring 50 is placed on the peripheral edge of the opening on the output pneumatic chamber 13 side of the communication hole 16 provided in the partition wall 15, and the upper end surface thereof is constricted 43 like the exhaust valve body 41 of the poppet valve 40. It is arranged so as to come into contact with the boundary portion with.

[Normal operation mode of pilot relay]
Next, a normal operation mode of the pilot relay 1 will be described with reference to FIGS. 1 and 2. Note that FIG. 1 shows the pilot relay 1 in the air supply mode, and FIG. 2 shows the pilot relay 1 in the exhaust mode.

As described above, the pilot relay 1 operates so as to switch between the air supply mode and the exhaust mode according to the value of the input air pressure Pn corresponding to the valve opening signal (electric signal) sent from the host controller CTL. To do. This switching is executed by the vertical movement of the first diaphragm 20 and the drive body 30 interlocking with the first diaphragm 20 (movement in the directions of arrows A and B in FIG. 1) and the vertical movement of the poppet valve 40.

The vertical movement of the first diaphragm 20 and the drive body 30 interlocking with the first diaphragm 20 is directed toward the pressing force Fn that presses these portions in the direction of arrow A in FIG. 1 and these in the direction of arrow B in FIG. The operation mode is determined by the magnitude relationship of the pressing force Fo that presses the portion. Here, the pressing force Fn is a force caused by the air of the input air pressure Pn introduced into the input air pressure chamber 11, and is the product of the pressure receiving area S20 of the first diaphragm 20 and the input air pressure Pn, that is, as S20 × Pn. It is calculated. Further, the pressing force Fo is a force caused by the air of the output air pressure Po in the output air pressure chamber 13, and is the product of the surface area S30 of the drive body 30 facing the output air pressure chamber 13 and the output air pressure Po, that is, S30 ×. Calculated as Po.

In the pilot relay 1, when the pressing force Fn and the pressing force Fo are equal (hereinafter referred to as "equilibrium state"), the exhaust valve body 41 of the poppet valve 40 and the opening 37 of the exhaust passage 36 come into contact with each other. Moreover, the air supply valve body 42 of the poppet valve 40 and the minimum opening diameter portion 16a of the communication hole 16 are set to come into contact with each other. That is, in the equilibrium state, the through hole 16 and the exhaust passage 36 are all closed, the supply air pressure chamber 12, the output air pressure chamber 13 and the exhaust chamber 14 are in a non-communication state with each other, and a state in which neither air supply nor exhaust is provided is maintained. Will be done.

On the other hand, when the pressing force Fn is larger than the pressing force Fo, the air supply mode is set, and when the pressing force Fn is smaller than the pressing force Fo, the exhaust mode is set. Hereinafter, the operation mode in the mode will be described.

First, the operation mode of the air supply mode shown in FIG. 1 will be described.
When the pressing force Fn increases from the equilibrium state in which the pressing force Fn and the pressing force Fo antagonize, that is, when the input air pressure Pn increases, the first diaphragm 20 and the driving body 30 interlocking with the first diaphragm 20 are shown in FIG. It moves downward in the direction of arrow A. At this time, the valve seat 33 constituting the lower end portion of the drive body 30 remains in contact with the exhaust valve body 41 of the poppet valve 40 located below the drive body 30, that is, the exhaust passage 36 remains closed, and the spring 50. The poppet valve 40 is pressed in the direction of arrow A against the urging force. Then, the air supply valve body 42 constituting the lower end portion of the poppet valve 40 moves downward and is separated from the opening on the supply air pressure chamber 12 side of the communication hole 16 which opens in the partition wall 15. At this time, a flow path is formed between the constricted portion 43 of the poppet valve 40 and the communication hole 16, and the supply air pressure chamber 12 and the output air pressure chamber 13 communicate with each other. As a result, the air of the supply air pressure Ps in the supply air pressure chamber 12 is supplied to the output air pressure chamber 13 without flowing out to the exhaust chamber 14, and then is provided downstream of the pilot relay 1 through the output air hole 13a. It is fed to a device (eg, valve VAL) (see streamline indicated by arrow in FIG. 1).

In the air supply mode, the air pressure in the output air pressure chamber 13, that is, the output air pressure Po is gradually increased by supplying the air having the supply air pressure Ps. When the output air pressure Po increases, the pressing pressure Fo increases, and when the pressing pressure Fo and the pressing pressure Fn antagonize, the equilibrium state is reached again.

Next, the operation mode of the exhaust mode shown in FIG. 2 will be described.
When the pressing force Fn decreases from the equilibrium state in which the pressing force Fn and the pressing force Fo antagonize, that is, when the input air pressure Pn decreases, the first diaphragm 20 and the driving body 30 interlocking with the first diaphragm 20 are shown in FIG. Move upward in the direction of arrow B. Then, the valve seat 33 forming the lower end portion of the drive body 30 is separated from the exhaust valve body 41 of the poppet valve 40 located below the valve seat 33, and the exhaust passage 36 is opened to open the output pneumatic chamber 13 and the exhaust chamber 14. Will be in a state of communication. At this time, the state in which the air supply valve body 42 forming the lower end of the poppet valve 40 and the minimum opening diameter portion 16a of the communication hole 16 opening in the partition wall 15 are in contact with each other, that is, the state in which the communication hole 16 is closed is Since it is still maintained, the supply air pressure chamber 12 and the output air pressure chamber 13 are in a non-communication state.
As a result, the air of the output air pressure Po in the output air pressure chamber 13 is guided to the exhaust chamber 14 through the exhaust passage 36, and then discharged to the outside air through the exhaust passage 14a (indicated by the arrow in FIG. 2). See streamlined).

In the exhaust mode, the air pressure in the output air pressure chamber 13, that is, the output air pressure Po gradually decreases. When the pressing force Fo becomes small enough to antagonize the pressing force Fn due to the decrease in the output air pressure Po, the equilibrium state is reached again.

[Operation mode when the pilot relay is abnormal]
The pilot relay 1 repeats the air supply mode and the exhaust mode each time the input air pressure Pn fluctuates. As a result, the air supply valve body 42 of the poppet valve 40 and the minimum opening diameter portion 16a of the communication hole 16 opening in the partition wall 15 repeatedly collide with each other. Here, as described above, the poppet valve 40 is formed of, for example, a forged product made of stainless steel, and the partition wall 15 which is a part of the housing 10 is formed of, for example, a cast product made of an aluminum alloy. Therefore, the air supply valve body 42 having a high surface hardness attacks the minimum opening diameter portion 16a of the communication hole 16 having a low surface hardness, and as a result, the minimum opening diameter portion 16a is worn and deformed, and finally supplied. The minimum diameter of the minimum opening diameter is larger than the maximum outer diameter of the valve body 42. Then, the poppet valve 40 further moves upward from the normal position toward the direction of arrow A in FIG. 1, that is, toward the driving body 30 by the urging force of the spring 50 (hereinafter, such an operation mode is referred to as "abnormal mode"). That.).

As described above, the poppet valve 40 is provided with an overhanging portion 44 having a predetermined size and shape at the lower end portion (lower end surface of the air supply valve body 42). The overhanging portion 44 is configured to come into contact with the wall surface portion 15a formed on a part of the partition wall 15 at a position where the poppet valve 40 is moved upward by a predetermined distance from the normal position. Here, as described above, the predetermined distance is smaller than the moving distance of the drive body 30 when the air supply valve body 42 is closed, that is, the air supply valve body 42 closes the communication hole 16 and the exhaust valve. The drive body 30 is from the state α in which the body 41 closes the exhaust passage 36 to the state β in which the air supply valve body 42 closes the communication hole 16 and the exhaust valve body 41 and the exhaust passage 36 are most separated from each other. Is a distance smaller than the distance traveled by. Therefore, as shown in FIG. 5, the poppet valve 40 is restricted from moving upward and comes to rest before reaching the state β, in other words, before the drive body 30 reaches the upper limit position. (Hereinafter, this stationary position is referred to as a "regulated position").

In this way, the overhanging portion 44 and the wall surface portion 15a function as a "stopper mechanism" for stopping the poppet valve 40 at the regulated position when they come into contact with each other. As a result, in the pilot relay 1, it is possible to avoid a situation in which the exhaust valve body 41 is fitted into the opening 37 of the exhaust passage 36 and is blocked in the abnormal mode, and the output pneumatic chamber 13 and the exhaust chamber 14 are combined. Can be maintained in a state of communication. Further, in the poppet valve 40 shown in FIG. 3, since the overhanging portion 44 closes the communication hole 16, it is necessary to prevent the pressurized air in the supply air pressure chamber 12 from flowing into the output air pressure chamber 13. Can be done.

[Effect of this embodiment]
According to the pilot relay 1 according to the present embodiment, as described above, it is possible to avoid a situation in which the exhaust passage 36 is blocked by the exhaust valve body 41 in the abnormal mode, and the output pneumatic chamber 13 and the exhaust gas. The state of communication with the room 14 is maintained. Therefore, even if the abnormal mode is entered, the high-pressure air in the output air pressure chamber 13 is immediately discharged to the outside through the exhaust passage 36, the exhaust chamber 14, and the exhaust passage 14a (indicated by the arrows in FIG. 5). (See streamline), it is possible to avoid a situation in which a high pressure remains in the supply air pressure chamber 12. Further, by closing the communication hole 16 by the overhanging portion 44, it is possible to prevent the pressurized air (air of the output air pressure Po) in the supply air pressure chamber 12 from flowing into the output air pressure chamber 13. As a result, in the abnormal mode, the fail-safe concept of immediately leading the pilot relay 1 and the device including the pilot relay 1 and the device including the pilot relay 1 and the device arranged downstream (for example, the valve VAL) to a safe state and stopping the state thereof. It is possible to provide a pilot relay 1 having a structure based on the above.

Further, the pilot relay 1 having a structure based on such a fail-safe concept can be realized solely by the structure of the poppet valve, and the pilot relay 1 having excellent cost effectiveness can be provided.

Further, by providing the overhanging portion 44, it is possible to prevent dust in the instrumentation air from entering the poppet valve 40 during use, so that clogging in the pilot relay 1 can be suppressed. Thereby, the pilot relay 1 having a long product life can be provided.

[Modified example of this embodiment]
As a modification of the pilot relay 1 (modification example 1), for example, as shown in FIG. 4, a part thereof is scraped off instead of the disk-shaped overhanging portion 44 provided in the poppet valve 40, and the outside from the lower side wall surface. There is a poppet valve 40-2 and a pilot relay 1 having four arm-shaped portions projecting toward the surface, which are formed as overhanging portions 44-2 having a shape arranged at substantially equal intervals in a plan view.

Even in the pilot relay 1 provided with the poppet valve 40-2, the exhaust passage 36 is blocked by the exhaust valve body 41 due to the contact between the overhanging portion 44-2 and the wall surface portion 15a in the abnormal mode. Is avoided, and the output pneumatic chamber 13 and the exhaust chamber 14 can always be maintained in a communicative state. Therefore, even if the abnormal mode is entered, the air in the output air pressure chamber 13 is immediately discharged to the outside through the exhaust chamber 14 and the discharge passage 14a (see the streamline indicated by the arrow in FIG. 5), and the supply air pressure chamber is used. It is possible to prevent high pressure from remaining in 12. Further, the weight of the poppet valve 40-2 is smaller than that of the poppet valve 40. Therefore, by using the poppet valve 40-2, it is possible to realize the pilot relay 1 having excellent responsiveness while achieving the above effects.

Further, as another modification (modification example 2) of the pilot relay 1, for example, as shown in FIGS. 6 and 7, the outer peripheral edge of the disc-shaped overhanging portion 44 included in the poppet valve 40 has a circular shape. The arranged protrusion 45 (corresponding to the "convex portion" described in the claims) is additionally projected to form an overhanging portion 44-3 and a poppet valve 40-3 provided with the overhanging portion 44-3, and the wall surface portion 15a. There is a pilot relay 1 provided with a groove 15b (corresponding to the "recess" described in the claims) that engages and engages with the protrusion 45. Here, the protrusions 45 may be one or a plurality, and the grooves 15b may be formed from one groove portion continuous in an annular shape, or may be arranged in a plurality of fragments. It may be formed from a groove. Further, the protrusion 45 and the groove 15b do not necessarily have a one-to-one correspondence. Further, the protrusion 45 and the groove 15b are half-engaged and half-barreled within a range that does not prevent the air supply valve body 42 of the poppet valve 40-3 from coming into contact with the minimum opening diameter portion 16a in the normal operation mode. It may be in a combined state.

According to the pilot relay 1 using such a poppet valve 40-3, the overhanging portion 44-3 and the wall surface portion 15a are crimped by the supply air pressure Ps while the protrusion 45 and the groove 15b are in contact with each other. , The sealing property of the communication hole 16 by the overhanging portion 44-3 is further enhanced. Further, in the specification in which the protrusion 45 provided on the overhanging portion 44-3 side and the groove 15b provided on the wall surface portion 15a side have a one-to-one correspondence with each other, the seal is formed by combining them. In addition to further enhancing the property, the effect of restricting the rotation of the poppet valve 40-3 around the hole axis of the communication hole 16 can be expected. As described above, according to the pilot relay 1 using the poppet valve 40-3, the above-mentioned effect is brought about in addition to the effect of the present embodiment.
Even if a plurality of protrusions 45 are projected, or even if the protrusions 45 and the grooves 15b are in a half-engaged / semi-coupling state in a normal operation mode, the protrusions 45 and the upper surface of the overhanging portion 44-3 As long as a gap is formed between the wall surface portion 15a and the wall surface portion 15a, the communication hole 16 is not blocked by the protrusion 45 in the normal air supply mode.

Further, as a further modification (modification 3) of the pilot relay 1, for example, as shown in FIGS. 8 and 9, the inside of the exhaust passage 36 of the drive body 30 is linearly extended to the top of the exhaust valve body 41. There is a pilot relay 1 including a poppet valve 40-4 having a columnar member 44-4 extended and an elastic member 46 arranged at a tip portion 44-4a of the columnar member 44-4. The elastic member 46 arranged at the tip end portion 44-4a of the columnar member 44-4 is in constant or appropriate contact with, for example, the inner wall surface 36a of the exhaust passage 36 provided in the area plate 31, and is in contact with the urging direction of the spring 50. It is configured so that the elastic force in the opposite direction acts on the poppet valve 40-4.

The elastic member 46 is made of, for example, a coil spring, an elastomer, or the like, and is connected or connected to the columnar member 44-4 by an existing attachment / fixing method such as a hook or an engagement groove. The elastic properties are determined, for example, under the conditions shown below.
That is, in the exhaust mode, in order for the air supply valve body 42 to close the communication hole 16 with a predetermined urging force, when the poppet valve 40 is in the normal position, the poppet valve 40- is passed through the columnar member 44-4. It is a necessary condition that the elastic force applied to 4 is less than the urging force applied to the poppet valve 40-4 through the spring 50, and the poppet valve 40-4 is not closer to the drive body 30 than the regulated position. In order to achieve this, the elastic force applied to the poppet valve 40-4 through the columnar member 44-4 must be greater than or equal to the urging force applied to the poppet valve 40-4 through the spring 50 when in the restricted position. It becomes a necessary condition. Therefore, the elastic properties of the elastic member 46 are determined so as to satisfy at least these two requirements.

According to the pilot relay 1 provided with the poppet valve 40-4 and the elastic member 46, the elastic member 46 arranged at the tip portion 44-4a of the columnar member 44-4 and the exhaust passage 36 provided in the area plate 31. By contacting the inner wall surface 36a of the poppet valve 40-4, the position of the poppet valve 40-4 can be restricted so as not to be closer to the drive body 30 than the restricted position. As a result, in the abnormal mode, the situation where the exhaust passage 36 is blocked by the exhaust valve body 41 is avoided, and the communication state between the output air pressure chamber 13 and the exhaust chamber 14 can be maintained. Therefore, immediately after the abnormal mode is entered, the air in the output pneumatic chamber 13 is always discharged to the outside through the exhaust chamber 14 and the exhaust passage 14a (see the streamline indicated by the arrow in FIG. 9) and supplied. It is possible to prevent high pressure from remaining in the pneumatic chamber 12.

The columnar member 44-4 in the above-mentioned modification 3 may be a columnar member made of an elastic member. In this case, the elastic member 46 becomes unnecessary.

Further, in the above-mentioned modification 3, the elastic member 46 is connected or coupled to the poppet valve 40-4 (more specifically, the tip portion 44-4a of the columnar member 44-4 provided on the poppet valve 40-4). However, the specifications may be such that the elastic member 46 is joined to the driving body 30 (for example, the inner wall surface 36a of the exhaust passage 36 provided in the area plate 31 constituting the driving body 30). In this case, the leaf spring-like elastic member having the elastic characteristics may be configured to protrude from the inner wall surface 36a of the exhaust passage 36.

Further, in the third modification, the driving body 30 (driving) is the same as the moving element, the poppet valve 40-4 (the tip portion 44-4a of the columnar member 44-4 provided on the poppet valve 40-4). An elastic member 46 is arranged between the inner wall surface 36a) of the exhaust passage 36 provided on the area plate 31 constituting the body 30, but the inner wall of the housing 10 which is a fixed element and the poppet valve which is a moving element. An elastic member may be arranged between the 40 and the 40. For example, elasticity that generates an elastic force in the direction opposite to the urging direction of the spring 50 between the inner wall of the housing 10 forming the lower surface of the supply air pressure chamber 12 and the lower end surface of the poppet valve 40 facing the supply air pressure chamber 12. A member may be interposed. As the method of attaching / fixing the elastic member at this time, an existing attachment / fixing method such as a hook or an engaging groove may be used. Further, the elastic characteristics of the elastic member may be determined so as to satisfy at least the above two necessary conditions.

Although the embodiment according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist thereof. Further, even if the configuration is not directly described in the specification and the drawings, it is within the scope of the technical idea of the present invention as long as the action and effect of the present invention are exhibited. Further, the above description and the embodiments shown in each figure can be combined with each other as long as there is no contradiction in the purpose and structure thereof.

For example, specifications (position and shape, etc.) of a portion constituting the stopper mechanism, that is, a wall surface portion 15a formed on the overhanging portion 44 provided on the poppet valve 40 and the partition wall 15 which is a part of the inner wall of the housing 10. Is not limited to the specifications shown in the above-described embodiment, and may be changed as appropriate. As an example, the portion that comes into contact with the overhanging portion 44 provided in the poppet valve 40 may be provided on the inner wall surface of the communication hole 16 that opens in the partition wall 15 instead of the wall surface portion 15a. At this time, the contacting portion has a diameter larger than the minimum opening diameter portion 16 of the communication hole 16.

1 ... Pilot relay, 10 ... Housing, 11 ... Input air pressure chamber, 11a ... Nozzle back pressure introduction pipe, 12 ... Supply air pressure chamber, 12a ... Air supply passage, 13 ... Output air pressure chamber, 13a ... Output air hole, 14 ... Exhaust Room, 14a ... Exhaust passage, 15 ... Partition, 15a ... Wall surface, 15b ... Groove, 16 ... Communication hole, 11 ... Input air pressure chamber, 11 ... Input air pressure chamber, 20 ... First diaphragm, 21 ... Second diaphragm, 22 ... 3rd diaphragm, 30 ... Drive body, 31 ... Area plate, 32 ... Inner member, 33 ... Valve seat, 36 ... Exhaust passage, 36a ... Inner wall surface, 37 ... Output side opening, 40 ... Poppet valve, 41 ... Exhaust Valve part, 42 ... Air supply valve part, 43 ... Constriction part, 44 ... Overhang part, 44-4 ... Columnar member, 45 ... Projection, 50 ... Spring.

Claims (10)

A housing having an internal space and having a first through hole, a second through hole, a third through hole, and a fourth through hole.
A partition wall provided in the housing, which separates the internal space in the housing into two spaces and has a first communication hole for communicating the two spaces.
A diaphragm supported by the inner wall of the housing so as to be displaceable in a predetermined direction,
A drive body having a second communication hole, which is supported by the diaphragm and moves in the housing in the predetermined direction.
A poppet valve having a first valve body that opens and closes the first communication hole and a second valve body that opens and closes the second communication hole, and is inserted through the first communication hole.
The first valve body includes an urging member that urges the poppet valve in a direction in which the first communication hole is closed.
In the housing
An input pneumatic chamber defined by the inner wall of the housing and the diaphragm into which air of input pneumatic pressure is introduced through the first through hole.
A supply air pressure chamber defined by the inner wall of the housing including the partition wall and to which air of the supply air pressure is supplied through the second through hole.
It is defined by the inner wall of the housing including the partition wall and the driving body, communicates with the supply air pressure chamber through the first communication hole, and outputs air of output air pressure to the outside through the third through hole. Output air pressure chamber and
Exhaust gas defined by the inner wall of the housing, the diaphragm, and the drive body, communicates with the output pneumatic chamber through the second communication hole, and discharges the internal air to the outside through the fourth through hole. In the pilot relay where the room is formed
A pilot relay further comprising a stopper mechanism for restricting the movement of the poppet valve from a predetermined position in the urging direction by the urging member. In the pilot relay according to claim 1,
At the predetermined position, when the input air pressure introduced into the input air pressure chamber is the minimum, the second valve body of the poppet valve whose movement is restricted by the stopper mechanism is the second communication hole. A pilot relay characterized by being in a position that does not close. In the pilot relay according to claim 2,
The stopper mechanism is provided on the poppet valve and includes a contact member configured to contact the inner wall of the housing including the partition wall when the poppet valve is in the predetermined position. Pilot relay to do. In the pilot relay according to claim 3,
The abutting member is provided on the poppet valve and is configured to project in a direction orthogonal to the urging direction and abut on a wall surface portion which is a part of the wall surface of the partition wall on the supply pneumatic chamber side. A pilot relay characterized by including an overhanging member. In the pilot relay according to claim 4,
The overhanging member is characterized in that at least a part of the peripheral edge is located outside the opening of the first communication hole and is located on the side opposite to the urging direction with respect to the wall surface portion. Pilot relay to do. In the pilot relay according to claim 5,
The surface of the wall surface and the overhanging member facing each other has an annular shape.
A pilot relay characterized in that the outer peripheral diameter of the overhanging member is larger than the inner peripheral diameter of the wall surface portion. In the pilot relay according to any one of claims 4 to 6.
The overhanging member is a pilot relay characterized in that the overhanging member projects from one end of the poppet valve on the side where the first valve body is provided. In the pilot relay according to claim 7.
The stopper mechanism includes a recess provided in the wall surface portion of the supply air pressure chamber.
The overhanging member is a pilot relay characterized by having a convex portion that engages with at least a part of the concave portion. In the pilot relay according to claim 1 or 2.
The stopper mechanism is arranged between the inner wall of the housing including the partition wall and any one of the driving bodies and the poppet valve, and the poppet valve is placed in the direction opposite to the urging direction of the urging member. Including elastic members to urge
A pilot relay characterized in that the elastic force of the elastic member when the poppet valve is in the predetermined position is larger than the urging force of the urging member when the poppet valve is in the predetermined position. In the pilot relay according to claim 9.
The stopper mechanism includes a columnar member provided on the poppet valve that linearly extends from the top of the second valve body to the inside of the second communication hole of the drive body.
A pilot relay characterized in that the elastic member is disposed between the tip end portion of the columnar member and the inner wall surface of the second communication hole of the drive body.

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