WO2020044827A1 - 流体制御機器 - Google Patents
流体制御機器 Download PDFInfo
- Publication number
- WO2020044827A1 WO2020044827A1 PCT/JP2019/027964 JP2019027964W WO2020044827A1 WO 2020044827 A1 WO2020044827 A1 WO 2020044827A1 JP 2019027964 W JP2019027964 W JP 2019027964W WO 2020044827 A1 WO2020044827 A1 WO 2020044827A1
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- WO
- WIPO (PCT)
- Prior art keywords
- diaphragm
- closed space
- fluid control
- control device
- bonnet
- Prior art date
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0236—Diaphragm cut-off apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1225—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston with a plurality of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1266—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being acted upon by the circulating fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0066—Hydraulic or pneumatic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
- F16K7/16—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being mechanically actuated, e.g. by screw-spindle or cam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
- F16K7/17—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being actuated by fluid pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
Definitions
- the present invention relates to a technology for detecting leakage of fluid in a fluid control device.
- ALD Advanced Deposition
- a film forming process requires a fluid control device that supplies a fluid to a film forming apparatus to perform a more frequent opening / closing operation than before, and the load may easily cause fluid leakage or the like. is there. Therefore, there is an increasing demand for a technology that can easily detect leakage of fluid in a fluid control device.
- highly reactive and highly toxic gas is used, it is important that the leakage can be detected remotely while leakage is very small.
- Patent Document 1 discloses a seal breakage detection mechanism including a hole formed on an outer surface of a controller for controlling a flow rate of a fluid and a leak detection member attached to the hole.
- the leak detection member comprises a tubular body attached to the hole and a movable member provided in the tubular body, and the movable member is a leaked fluid filled in the void in the controller.
- a controller with a seal portion breakage detection mechanism including a hole formed on an outer surface of a controller for controlling a flow rate of a fluid and a leak detection member attached to the hole, wherein the hole is a control member.
- Patent Literature 3 discloses a leak detection device that detects leakage of a fluid.
- the leak detection device includes a sensor holder and a leak port provided on the leak detection target member and communicating between a sealed portion in the leak detection target member and the outside.
- a circuit having a circuit has been proposed.
- a fluid control device is a fluid control device that detects a pressure in a closed space separated from a flow path, and a valve body in which the flow path is formed. And an isolation member for allowing or blocking the flow of fluid in the flow path and isolating the closed space from the flow path, and disposing the closed space between the isolation member provided on the valve body.
- the hood provided with a penetration hole through which the diaphragm press is vertically movably communicated with the closed space, and vertically moving in the penetration hole to press the isolation member,
- a diaphragm press provided with a large diameter portion that cannot be pulled out from the insertion hole, a pressure sensor for detecting a pressure in the closed space, and a large diameter portion of the diaphragm press and the bonnet in the closed space.
- the bonnet is provided with a housing portion that opens to the closed space side and houses the elastic body, and the elastic body expands and contracts with the vertical movement of the diaphragm press, and at the time of compression. It may be elastically deformed and housed in the housing section.
- the housing portion is configured as a portion of the through hole having an enlarged diameter in the vicinity of the closed space, and the elastic body seals between an inner peripheral surface of the through hole and the diaphragm retainer. It may be a thing.
- the elastic body may be housed in the housing part in a natural state with a gap formed on the side opposite to the closed space.
- the position of the enlarged diameter portion of the diaphragm press that moves up and down in the closed space may define the top dead center of the piston that interlocks with the diaphragm press.
- a seal member for sealing between the inner peripheral surface of the through hole and the diaphragm retainer in the vicinity of the closed space may be further provided.
- the fluid control device can accurately detect leakage even when leakage of the fluid is slight.
- FIG. 1A is a perspective view illustrating an appearance of a fluid control device according to a first embodiment of the present invention
- FIG. FIG. 2 is a cross-sectional view taken along line AA showing an internal structure of the fluid control device according to the first embodiment of the present invention, and shows (a) a valve closed state and (b) a valve open state.
- 1 is an exploded perspective view illustrating a fluid control device according to a first embodiment of the present invention.
- 1 is an exploded perspective view illustrating a fluid control device according to a first embodiment of the present invention.
- 1 is an exploded perspective view illustrating a fluid control device according to a first embodiment of the present invention.
- the fluid control device V1 according to the present embodiment shown in FIG. 1 is a device capable of detecting an internal operation by a built-in sensor, and based on detected information, an abnormality of the fluid control device V1, particularly, Fluid leakage can be detected. Further, the fluid control device V1 can be connected to an external terminal, and can provide the external terminal with information on an abnormality of the fluid control device V1 and information detected by a sensor. In a practical use situation of the fluid control device V1, the plurality of fluid control devices V1 are integrated with other flow control devices and the like to constitute a fluid control device (gas box).
- the fluid control device V1 is an air-operated direct diaphragm valve, and includes a valve body 1, a bonnet portion 2, a cover portion 3, and an actuator portion 4 as shown in FIGS.
- valve body 1 As shown in FIGS. 2 and 3, the valve body 1 includes a base portion 11 in which a flow path is formed, and a substantially cylindrical shape cylindrical portion 12 provided on the base portion 11.
- the base portion 11 has a rectangular shape in a plan view, and when a fluid control device unitized by a plurality of fluid control devices V1 is configured, the base portion 11 is a portion installed on a substrate or a manifold block.
- the cylindrical portion 12 has a hollow shape with an open end face on the side where the bonnet portion 2 is provided, and the hollow inside constitutes a concave portion 12a in which the bonnet portion 2 is accommodated.
- the cylindrical portion 12 has a length in the axial direction, and has an opening at one end on the side where the bonnet portion 2 is disposed and opposite to the base portion 11, and from the outside to the concave portion 12 a side.
- a through slit 12b is provided.
- the flexible cable 51 extending from the bonnet wall 25 is led from the inside to the outside through the slit 12b.
- the bonnet portion 2 is disposed so as to be housed in the recess 12a of the valve body 1.
- the bonnet portion 2 includes a sheet 21, a diaphragm 22, a diaphragm holder 23, a bonnet 24, and a bonnet wall 25, and also has an elastic body 6 for increasing the accuracy of detecting a pressure change due to fluid leakage.
- the annular seat 21 is provided on the periphery of the opening of the inflow passage in the valve chamber 112. By bringing the diaphragm 22 into and out of contact with the sheet 21, the fluid can be circulated from the inflow channel to the outflow channel, or the flow can be blocked.
- the diaphragm 22 is made of a metal such as stainless steel or a Ni-Co alloy, and is a spherical shell-like member whose central portion bulges in a convex shape, and separates the flow path from the space in which the actuator unit 4 operates. I have.
- the diaphragm 22 is not pressed by the diaphragm retainer 23, as shown in FIG. 2B, the diaphragm 22 is separated from the sheet 21 and communicates the inflow path and the outflow path to permit fluid flow. I do.
- the diaphragm presser 23 as shown in FIG. 2A, the central portion of the diaphragm 22 is deformed and abuts on the sheet 21, so that the inflow path and the outflow path are cut off, Cut off the distribution of
- the diaphragm holder 23 is provided above the diaphragm 22, and presses the center of the diaphragm 22 in conjunction with the vertical movement of the piston 43.
- the diaphragm retainer 23 includes a substantially columnar base portion 231 and an enlarged diameter portion 232 that is enlarged at one end on the side that comes into contact with the diaphragm 22.
- the base portion 231 is formed with a bottomed groove 231 a having a length in the axial direction and having an open end on the opposite side to the enlarged diameter portion 232.
- a shaft rod portion of a screw 25d screwed into the screw hole 25c of the bonnet wall 25 is slidably fitted into the groove 231a.
- the groove 231a and the screw 25d constitute a rotation restricting means for restricting the rotation of the diaphragm retainer 23 in the circumferential direction. As a result, the diaphragm retainer 23 moves up and down in conjunction with the piston 43, but moves in the circumferential direction. Rotation is restricted.
- the base body 231 is provided with a magnet M1 constituting a magnetic sensor.
- the magnet M1 constitutes a magnetic sensor described later together with the magnetic body M2 attached to the bonnet wall 25.
- the magnet M1 is mounted on the opposite side of the groove 231a of the base 231.
- other magnets on the base 231 may be used. It can also be attached at the position.
- the enlarged diameter portion 232 is a substantially disk-shaped portion having a diameter larger than the diameter of the through hole 241a of the bonnet 24, and is located in the closed space S2 so that the diaphragm holder 23 cannot be pulled out of the through hole 241a. And The enlarged diameter portion 232 presses the elastic body 6 between itself and the partition 241 of the bonnet 24 in accordance with the vertical movement of the diaphragm holder 23 interlocked with the piston 43.
- the width of the enlarged diameter portion 232 is set to a minimum width that enables the diaphragm holder 23 to be unable to be pulled out from the through hole 241a and allows the elastic body 6 to be pressed between the partitioning portion 241 of the bonnet 24. Is preferred.
- the width of the enlarged diameter portion 232 is set to such a width, and the width or diameter of the closed space S2 provided on the lower surface side of the partition portion 241 of the bonnet 24 is reduced according to the width or diameter of the enlarged diameter portion 232.
- the volume of the closed space S2 can be reduced.
- the diaphragm retainer 23 having such a configuration defines the top dead center of the piston 43 that moves up and down with opening and closing of the fluid control device V1. That is, when the upper surface of the enlarged diameter portion 232 of the diaphragm retainer 23 is opened, the elastic body 6 is pressed and compressed between the partition part 241 of the bonnet 24 and compressed. The position at the time of the contact constitutes the top dead center. Accordingly, unlike the case where the other position is set as the top dead center of the vertical movement of the piston 43, there is no need to allow a margin at the position where the enlarged diameter portion 232 of the diaphragm presser 23 reaches when the valve is opened, and the closed space S2 The volume can be minimized.
- the hood 24 has a substantially cylindrical shape, is disposed on the valve body 1, and forms a closed space between the hood 24 and the diaphragm 22.
- the diaphragm 22 is sandwiched between the bonnet 24 and the valve body 1, and the portion between the diaphragm 22 and the valve body 1 is sealed.
- a substantially disk-shaped partition portion 241 having a through hole 241a formed in the center thereof into which the diaphragm holder 23 is vertically movably inserted.
- the hood wall 25 is accommodated in the recess 24a formed above the partition 241 or on the side where the actuator 4 is provided.
- the partition 241 and the bonnet wall 25 are provided with screw holes 241b and through holes 25e at positions corresponding to each other, and the bonnet wall 25 is screwed to the bonnet 24 with bolts 25f.
- the partition 241 of the bonnet 24 has a certain thickness, and an O-ring O2 as a seal member is provided between the inner peripheral surface of the through hole 241a formed in the partition 24 and the diaphragm holder 23. It is interposed. Thereby, the airtightness of the closed space S2 defined by the partition part 241, the diaphragm 22, and the diaphragm retainer 23 is secured.
- the O-ring O2 for ensuring the airtightness of the closed space S2 is provided near the closed space S2 in the operation direction of the diaphragm holder 23 that moves up and down.
- the vicinity of the closed space S2 referred to here means at least a position closer to the closed space S2 side than the side where the diaphragm presser 23 contacts the piston 43 in the operation direction of the diaphragm presser 23 that moves up and down. Indicates a position where the O-ring O2 and the enlarged diameter portion 232 of the diaphragm retainer 23 can maintain a minimum distance separated without contact.
- the partition 241 of the bonnet 24 is provided with a communication hole 241 d communicating with the pressure sensor P attached to the bonnet wall 25. Since the pressure sensor P is provided through the communication hole 241d, the pressure in the closed space S2 defined by the partition part 241, the diaphragm 22, and the diaphragm holder 23 can be measured.
- a through hole 241c is provided on a side surface of the bonnet 24 for leading out the flexible cable 51 derived from the bonnet wall 25 housed inside.
- the bonnet wall 25 is a member provided inside the hood 24.
- the bonnet wall 25 has a shape in which a thick, substantially disk-shaped member is hollowed out in a substantially C shape in plan view.
- a through hole 25a through which the base portion 231 of the diaphragm holder 23 is inserted.
- an opening 25b is provided to open the penetration hole 25a outward in the radial direction of the bonnet wall 25.
- a screw hole 25c which is threaded radially outward from the through hole 25a is formed at a predetermined position in the thickness portion of the bonnet wall 25.
- a screw 25d is screwed into the screw hole 25c from the outside, and the axial center portion of the screwed screw 25d escapes toward the through hole 25a, and the groove of the diaphragm retainer 23 inserted into the through hole 25a. 231a is slidably fitted.
- a through hole 25 e is provided in the bonnet wall 25 at a position corresponding to the screw hole 241 b of the hood 24.
- Bolts 25f are screwed into the screw holes 241b and the through holes 25e in a state where the hood wall 25 is disposed on the partition portion 241 of the hood 24, whereby the hood wall 25 is fixed to the hood 24.
- a flat plate-shaped magnetic body M2 is fixed to the outer peripheral surface of the bonnet wall 25 in the vicinity of the opening 25b so as to cover the opening 25b.
- the magnetic body M2 forms a magnetic sensor described later together with the magnet M1 attached to the diaphragm holder 23.
- the elastic body 6 is a member that expands and contracts elastically in response to an external force, and is made of a porous soft resin or the like whose outer surface is coated with a non-porous material. Further, in this example, the base is formed in a ring shape having a certain thickness, and a through hole 6a through which the base portion 231 of the diaphragm holder 23 is inserted is provided in the center.
- the elastic body 6 is interposed between the enlarged diameter part 232 of the diaphragm holder 23 and the partition part 241 of the bonnet 24 in a state where the base part 231 of the diaphragm holder 23 is inserted into the through-hole 6a.
- 23 expands and contracts elastically with the vertical movement of 23. That is, when the diaphragm control 23 separates from the diaphragm 22 when the valve of the fluid control device V1 is opened, the diaphragm control 23 is compressed between the enlarged portion 232 of the diaphragm support 23 and the partition 241 of the bonnet 24 and compressed.
- the diaphragm retainer 23 comes into contact with the diaphragm 22, and when the enlarged portion 232 of the diaphragm retainer 23 and the partition 241 of the bonnet 24 are separated from each other, they are released from the pinched state and swelled and compressed. Return to the previous natural state. Thereby, the volume of gas occupying in the closed space S2 can be reduced by the amount of the elastic body 6 of the fluid control device V1.
- the elastic body 6 is formed in a ring shape so that the diaphragm holder 23 can be inserted into the through hole 6a.
- the enlarged diameter portion 232 of the diaphragm holder 23 is used. It may be of any other shape as long as it is interposed between the hood 24 and the partition 241 and elastically expands and contracts.
- the outer shape may be rectangular, or may be configured as an aggregate of a plurality of elastic members.
- the cover part 3 sandwiches and holds the actuator body 41 and the valve body 1 integrally, and also connects the circuit board 52 and the connector 53 provided on the circuit board 52 to a fluid control device.
- a fixing means for fixing to V1 is constituted.
- the cover unit 3 includes a cover 31 and flat plates 32 and 33.
- the cover 31 has a substantially U shape, and the actuator body 41 and the end of the valve body 1 are fitted inside the cover 31.
- screw holes 31a are provided corresponding to positions where the actuator bodies 41 are fitted.
- a screw hole 31c is provided in the thickness portion of the cover 31.
- the screws 32d are screwed into the screw holes 31c through the through holes 32b, 33b of the plates 32, 33, so that the plates 32, 33 are attached to the cover 31.
- the plates 32 and 33 are screwed and fixed to the cover 31 in a state where the ends of the actuator body 41 and the valve body 1 are fitted inside the cover 31. In the fixed state, the actuator body 41 is located between the cover 31 and the cover 31. And the valve body 1 are held under clamping pressure. Below the plate 32, a notch portion 32a cut out like a tongue is formed, and the flexible cable 51 is led out to the circuit board 52 provided with the connector 53 via the notch portion 32a.
- the plate 33 is screwed and fixed to the plate 32 and the cover 31 with the circuit board 52 interposed between the plate 33 and the plate 32, and holds the circuit board 52 between the plate 32 and the plate 32.
- the plate 33 is provided with a substantially rectangular through hole 33a at the center, and the connector 53 provided on the circuit board 52 comes out of the through hole 33a.
- the cover portion 3 directs the connector 53 in a diagonal direction of the rectangular base portion 11 as shown in FIG. It is fixed to V1.
- the reason why the connector 53 is fixed in such an orientation is as follows.
- a fluid control device (gas box) unitized by a plurality of fluid control devices V1 it is necessary to integrate the adjacent rectangular bases 11 so that the gap is as small as possible due to the demand for integration. And it is preferable to dispose the fluid control device V1 on a base or a manifold block.
- the components are arranged and integrated as described above, it becomes difficult to connect terminals and the like to the connector 53.
- the actuator section 4 is provided on the bonnet section 2. As shown in FIG. 2, the actuator section 4 includes an actuator body 41, an actuator cap 42, a piston 43, and a spring 44. Although the internal structure of the actuator section 4 is omitted in FIG. 3, the internal structure is as shown in FIG.
- the actuator body 41 is interposed between the piston 43 and the bonnet 24. As shown in FIG. 3, the actuator body 41 has a substantially cylindrical shape, and a through hole 41a through which the piston 43 and the diaphragm retainer 23 are inserted is provided in the center along the length direction. As shown in FIG. 2, the piston 43 and the diaphragm retainer 23 are in contact with each other in the through hole 41 a, and the diaphragm retainer 23 moves up and down in conjunction with the vertical movement of the piston 43.
- a peripheral wall 411 formed of an annular ridge is formed on the upper end surface of the actuator body 41 on the side where the piston 43 is disposed, and a flat horizontal surface inside the peripheral wall 411 and a portion below the enlarged diameter portion 431 of the piston 43 are formed.
- a drive pressure introduction chamber S1 into which the drive pressure is introduced is formed between the end face and the end face.
- an external thread is cut on the outer peripheral surface of the actuator body 41 on the side where the piston 43 is provided, and the external thread is screwed with a female screw cut on the inner peripheral surface of the actuator cap 42 to thereby form the actuator.
- the body 41 is attached to one end of the actuator cap 42.
- the longitudinal center portion of the actuator body 41 is formed in a substantially hexagonal shape in cross section, and the hexagonal portion in cross section and the upper end portion of the valve body 1 are integrally pressed by the cover 31.
- the actuator cap 42 is a cap-shaped member having an open lower end, and houses a piston 43 and a spring 44 therein.
- An opening 42 a communicating with the driving pressure introduction passage 432 of the piston 43 is provided on the upper end surface of the actuator cap 42.
- the lower end of the actuator cap 42 is closed by screwing the upper part of the actuator body 41.
- the piston 43 moves up and down in response to the supply and stop of the driving pressure, and causes the diaphragm 22 to contact and separate from the sheet 21 via the diaphragm presser 23.
- a substantially central portion of the piston 43 in the axial center direction is expanded in a disk shape, and the portion constitutes an enlarged diameter portion 431.
- the piston 43 receives the urging force of the spring 44 on the upper surface side of the enlarged diameter portion 431.
- a drive pressure introduction chamber S1 to which a drive pressure is supplied is formed at the lower end side of the enlarged diameter portion 431.
- a drive pressure introduction passage 432 for communicating the opening 43a formed on the upper end surface with the drive pressure introduction chamber S1 formed on the lower end side of the enlarged diameter portion 431 is provided inside the piston 43.
- the opening 43a of the piston 43 communicates with the opening 42a of the actuator cap 42, and an introduction pipe for introducing driving pressure from the outside is connected to the opening 42a, whereby the driving pressure is supplied to the driving pressure introduction chamber S1. Supplied.
- An O-ring O41 is mounted on the outer peripheral surface of the enlarged diameter portion 431 of the piston 43, and the O-ring O41 seals between the outer peripheral surface of the enlarged diameter portion 431 of the piston 43 and the peripheral wall 411 of the actuator body 41. ing.
- An O-ring O42 is also attached to the lower end of the piston 43, and the O-ring O42 seals between the outer peripheral surface of the piston 43 and the inner peripheral surface of the through hole 41a of the actuator body 41.
- the O-rings O41 and O42 form a driving pressure introducing chamber S1 communicating with the driving pressure introducing passage 432 in the piston 43, and the airtightness of the driving pressure introducing chamber S1 is ensured.
- the spring 44 is wound around the outer peripheral surface of the piston 43 and contacts the upper surface of the enlarged diameter portion 431 of the piston 43 to urge the piston 43 downward, that is, in a direction to press the diaphragm 22 down.
- the fluid control device V1 includes a pressure sensor P and a magnetic sensor including a magnet M1 and a magnetic body M2 as a sensor for detecting an operation in the device.
- the pressure sensor P is attached to the lower surface of the bonnet wall 25 or the flow path side, and is defined by the diaphragm 22, the partition 241 of the bonnet 24, and the diaphragm holder 23 through the communication hole 241 d.
- the pressure sensor P includes a pressure-sensitive element that detects a change in pressure, a conversion element that converts a pressure detection value detected by the pressure-sensitive element into an electric signal, and the like.
- the pressure sensor P can detect the pressure in the closed space S2 defined by the diaphragm 22, the partition 241 of the bonnet 24, and the diaphragm holder 23.
- packing 26 is interposed at a position where the pressure sensor P communicates with the communication hole 241d, and an airtight state is secured.
- the pressure sensor P may detect either the gauge pressure or the atmospheric pressure. If the threshold value referred to by the determination processing unit 71 (described later with reference to FIG. 7) is set in each case, Good. In the present embodiment, the pressure sensor P detects a change in pressure in the closed space S2, thereby detecting an abnormality of the fluid control device V1 due to leakage of fluid or the like. It is possible to use as. That is, the condenser microphone unit has a diaphragm that vibrates in response to a sound wave, and a counter electrode that is arranged to face the diaphragm, and changes the capacitance between the diaphragm and the counter electrode to a voltage. The sound signal can be converted into a change.
- the condenser microphone unit becomes omnidirectional (omnidirectional) by closing an air chamber provided on the back side of the diaphragm.
- the condenser microphone unit operates by detecting a change in sound pressure due to sound waves from all directions, and thus can be used as a pressure sensor.
- a magnetic body M2 is attached to the opening 25b of the bonnet wall 25, and the magnetic body M2 constitutes a magnetic sensor together with the magnet M1 attached to the diaphragm holder 23.
- the opening and closing operation of the valve can be detected by the magnetic sensor as described below. That is, while the magnet M1 moves up and down in response to the up and down movement of the diaphragm holder 23, the magnetic body M2 is fixed inside the valve body 1 together with the bonnet wall 25 and the bonnet 24.
- a magnetic sensor is used.
- the present invention is not limited to this, and other types of sensors such as an optical position sensor may be used in other embodiments.
- One end of a flexible cable 51 for communication having flexibility is connected to each of the pressure sensor P and the magnetic sensor (more specifically, the magnetic sensor is connected to the magnetic body M2). Is connected to a circuit board 52 provided outside the fluid control device V1.
- a processing module 7 (described later with reference to FIG. 7) configured to execute predetermined information processing is configured on the circuit board 52.
- the processing module 7 executes a process of detecting an abnormality of the fluid control device V1 based on information acquired from the pressure sensor P or the magnetic sensor.
- a substantially rectangular connector 53 for connecting external terminals is provided on the circuit board 52, whereby data measured by the pressure sensor P and the magnetic sensor is extracted or executed by the processing module 7. It is possible to extract data relating to the processing result of the abnormality determination processing.
- a flexible board (FPC) is used for the flexible cable 51 and the circuit board 52, and the flexible cable 51, the circuit board 52, and the connector 53 are integrally formed.
- FPC flexible board
- the processing module 7 may be stored in the fluid control device V1 separately from the circuit board 52, or may be configured as a part of the pressure sensor P or the magnetic sensor.
- the type and shape of the connector 53 can be appropriately designed according to various standards.
- the fluid control device V1 having the above configuration can reduce the volume in the closed space S2 by the amount of the elastic body 6, it is possible to accurately detect a pressure change in the closed space S2. As a result, it is possible to detect an abnormality such as a slight leakage of the fluid from the flow path to the closed space S2 due to breakage of the diaphragm 22, and the like.
- the processing module 7 is configured by an arithmetic circuit and a memory provided on the circuit board 52, and includes a functional block including a determination processing unit 71 and a communication processing unit 72, as shown in FIG.
- the processing module 7 is configured to be able to cooperate with the pressure sensor P and the magnetic sensor by the flexible cable 51, and can receive data from the pressure sensor P and the magnetic sensor.
- the discrimination processing unit 71 compares the predetermined threshold value held in the reference table or the like with the detected value of the pressure detected by the pressure sensor P, thereby detecting the fluid caused by the leakage of the fluid into the closed space S2.
- a process for determining an abnormality of the control device V1 is executed. That is, during normal use, the threshold value of the pressure in the closed space S2 assumed when the valve of the fluid control device V1 is opened and closed is set as a predetermined threshold value. Then, when the detected value of the pressure in the closed space S2 exceeds the threshold value, it is determined that an abnormality has occurred in the fluid control device V1.
- the reason for such determination is that the fluid leaks into the closed space S2 due to the breakage of the diaphragm 22 or the like and the pressure in the closed space S2 increases, or the pressure in the closed space S2 increases due to the pressure reduction in the flow path. This is because the detected value of the pressure in the closed space S2 can be regarded as exceeding the threshold as a result of the decrease.
- the communication processing unit 72 is a functional unit for executing a process of transmitting a determination result by the determination processing unit 71 to the external terminal 8 connected via the connector 53.
- the processing result of the determination processing unit 71 is transmitted to the external terminal 8 via the connector 53.
- the communication processing unit 72 may be configured to perform, for example, wireless LAN, Bluetooth (registered trademark), infrared communication, or the like. Or Zigbee (registered trademark) or the like, and can be transmitted by wireless communication.
- the communication processing unit 72 may transmit the determination result by the determination processing unit 71 at an arbitrary set period such as one hour or one day. it can. In this regard, it is difficult to detect a minute leak of the fluid at that moment, but it can be detected in a few days because the pressure is increased. On the other hand, since the closed space S2 is an airtight space, even if a minute leak occurs, it is unlikely to cause a problem immediately. Therefore, there is no problem even if transmission is performed at a predetermined cycle. Further, when information is transmitted in a predetermined cycle as described above, power consumption can be suppressed.
- each fluid control device V1 When a plurality of fluid control devices V1 are integrated to constitute a fluid control device, the communication processing unit 72 of each fluid control device V1 performs a determination process together with self-identification information capable of identifying itself to the external terminal 8. The determination result by the unit 71 can be transmitted at different timings for each fluid control device V1.
- any of the plurality of fluid control devices V1 constituting the fluid control device is abnormal due to the transmission of the self-identification information capable of individually identifying the fluid control device V1 to the external terminal 8. Can be determined.
- the problem of packet collision can be avoided, and compared to a case where the determination result is transmitted all at once, Overload of the processing can be prevented.
- the connection means between the fluid control device V1 and the external terminal 8 is realized by Bluetooth (registered trademark), the number of simultaneous connections is limited (usually seven). Of the fluid control device V1 can be used.
- the external terminal 8 is a so-called personal computer or server, a portable terminal or the like capable of transmitting / receiving and processing data, and includes a CPU (a computer program executed by the CPU, a RAM (Random Access Memory) storing a computer program and predetermined data). Memory), ROM (Read Only Memory), and hardware resources such as an external storage device such as a hard disk drive.
- the external terminal 8 has a communication processing unit for receiving a determination result of leakage of fluid to the closed space S2 of the fluid control device V1.
- the information received by the external terminal 8 from the fluid control device V1 is provided to the terminal used by the supervisor or the like in response to a request from the terminal used by the administrator or the supervisor of the fluid control device V1.
- the fluid control device V1 Based on the comparison between the pressure in the closed space S2 detected by the pressure sensor P and the predetermined threshold value, the fluid control device V1 caused by leakage of the fluid into the closed space S2 or the like by the fluid control device V1 having the above configuration. Abnormality can be detected. In addition, since information regarding the abnormality of the fluid control device V1 is collected in the external terminal 8, a person monitoring the fluid control device V1 can monitor the operation state of the fluid control device V1 without burden. Further, the fluid control device V1 detects the pressure in the closed space S2, and then detects an abnormality by comparing a predetermined threshold value with a detected value. Even in this case, this can be detected.
- the determination processing unit 71 may be provided in the external terminal 8 and the operation information of the fluid control device V1 such as the detection value of the pressure sensor P may be transmitted to the external terminal 8. Often, various mechanisms are possible.
- the fluid control device V ⁇ b> 2 has a hood 24 provided with a housing portion 24 b for housing the elastic body 9.
- the fluid control device V2 is referred to as a modification of the fluid control device V1 according to the above-described first embodiment, and has the same function and configuration.
- the members are denoted by the same reference numerals as those of the fluid control device V1, and description thereof will be omitted.
- the hood 24 in the present embodiment is provided with a substantially concave accommodation portion 24b that opens toward the closed space S2 side and accommodates the elastic body 9 from the opening.
- the housing portion 24b forms a part of the through hole 241a provided in the partition portion 241 of the bonnet 24, and has a diameter larger than that of the other portion of the through hole 241a. Has a diameter larger than the diameter of the base portion 231.
- the enlarged diameter portion 232 of the diaphragm retainer 23 defines the top dead center of the piston 43 that moves up and down with opening and closing of the fluid control device V1. It is preferred to do so.
- the elastic body 9 is a member that expands and contracts elastically in response to an external force, like the elastic body 6 described above, and is made of a porous soft resin or the like whose outer surface is coated with a non-porous material. Also in this example, it is formed in a substantially ring shape, and a through hole 9a through which the base portion 231 of the diaphragm holder 23 is inserted is provided at the center.
- the elastic body 9 in this example is elastically disposed between the seal portion 91 accommodated in the accommodation portion 24b in the natural state and the enlarged portion 232 of the diaphragm holder 23 and the partition portion 241 of the bonnet 24. And an expanding / contracting portion 92 that expands / contracts.
- the seal portion 91 has a substantially ring shape conforming to the shape of the housing portion 24b.
- the seal portion 91 seals the space between the diaphragm retainer 23 and the bonnet 24 in the state of being housed in the housing portion 24b to ensure the airtightness of the closed space S2, and the fluid control according to the first embodiment described above.
- the function of the O-ring O2 constituting the device V1 is achieved.
- the O-ring O2 included in the fluid control device V1 according to the first embodiment may not be provided. However, this does not prevent separately providing the O-ring O2, and the O-ring O2 may be provided as in the first embodiment.
- the expansion / contraction portion 92 has a substantially ring shape similarly to the seal portion 91, but has a larger diameter than the diameter of the housing portion 24b and the seal portion 91.
- the expansion / contraction portion 92 is interposed between the enlarged portion 232 of the diaphragm retainer 23 and the partition 241 of the bonnet 24 in a state where the base portion 231 of the diaphragm retainer 23 is inserted into the through hole 9a.
- the presser 23 expands and contracts elastically with the vertical movement.
- the elastic body 9 is formed in a substantially ring shape so that the diaphragm holder 23 can be inserted through the through hole 9a.
- Any other shape may be used as long as it protrudes from 24b and expands and contracts elastically in response to the pressing force from the enlarged diameter portion 232 of the diaphragm retainer 23.
- the outer shape may be rectangular, or may be configured as an aggregate of a plurality of elastic members.
- the expansion and contraction portion 92 may have the same diameter as the accommodation portion 24b and the seal portion 91, and the outer peripheral surfaces of the seal portion 91 and the expansion and contraction portion 92 may be flush.
- the configuration of the elastic body 9 including the housing portion 24b and the seal portion 91 and the expansion / contraction portion 92 does not exclude a configuration in which a part or the entirety of the expansion / contraction portion 92 is stored in the storage portion 24b. . Therefore, when the fluid control device V2 is opened, part or all of the expansion / contraction portion 92 of the elastic body 9 is elastically deformed by the pressing force from the diaphragm retainer 23, and is accommodated in the accommodation portion 24b. You may. Further, if the fluid control device V1 according to the first embodiment described above is provided with the O-ring O2 provided, the elastic body 9 is formed only of the expansion / contraction portion 92 without providing the seal portion 91. You can also. In this case, when the fluid control device V2 is opened, a part or all of the elastic body 9 is housed in the housing part 24b by the pressing force from the diaphragm holder 23.
- the elastic body 9 is housed in the housing portion 24b, but in a natural state when the valve is closed, a space is formed on the side opposite to the closed space S2 (in the back of the housing portion 24b) and housed in the housing portion 24b. You may make it.
- the elastic body 9 is accommodated in the accommodating portion 24b while filling the gap, while when the valve is closed, the elastic body 9 protrudes into the closed space S and the volume of the closed space S2 can be reduced.
- the volume of the gas occupying the closed space S2 by the amount of the elastic body 9 can be reduced while the space between the diaphragm holder 23 and the bonnet 24 is sealed.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Fluid-Pressure Circuits (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
しかし、そのような成膜処理は成膜装置に流体を供給する流体制御機器に今まで以上の高頻度な開閉動作を要求しており、その負荷により流体の漏出等を惹き起こしやすくなる場合がある。そのため、流体制御機器における流体の漏出を容易に検知できる技術への要求が高まっている。
また、半導体製造プロセスにおいては反応性が高く極めて毒性の高いガスが使われるため、漏出が微小なうちに、かつ遠隔的に漏出を検知できることが重要である。
また、特許文献2では、流体の流量を制御する制御器の外面に形成された孔とこの孔に取付けられる漏洩検知部材とからなるシール部破損検知機構付制御器であって、前記孔は制御器内の空隙に連通し、前記漏洩検知部材は特定の流体の存在によって感応するものが提案されている。
また、特許文献3では、流体の漏れを検出する漏れ検出装置であって、センサ保持体と、漏れ検出対象部材に設けられて漏れ検出対象部材内の密封部分と外部とを連通するリークポートに対向するようにセンサ保持体に保持された超音波センサと、超音波センサのセンサ面とリークポートとの間に設けられた超音波通路と、超音波センサで得られた超音波を処理する処理回路とを備えているものが提案されている。
また、特許文献2記載のシール部破損検知機構付制御器では、流体の漏出が僅かである場合には、パージガスで希釈化されて漏洩検知部材が感応しないおそれがあり、また、漏洩検知部材が所定の流体に対しては感応しないおそれもある。
さらに、特許文献3記載の漏れ検出装置では、流体の漏出が僅かである場合には、超音波が微弱で漏出を検知できないおそれがある。
なお、以下の説明では、便宜的に図面上での方向によって部材等の方向を上下左右と指称することがあるが、これらは本発明の実施あるいは使用の際の部材等の方向を限定するものではない。
図1に示す本実施形態に係る流体制御機器V1は、内蔵するセンサによって内部動作を検出可能な機器であって、検出した情報に基づいて流体制御機器V1の異常、特に流体制御機器V1内における流体の漏出を検知することができる。また、この流体制御機器V1は、外部端末に接続し、当該外部端末に対して流体制御機器V1の異常に関する情報やセンサによって検出した情報を提供することができる。
なお、流体制御機器V1の実際的な使用場面においては、複数の流体制御機器V1は他の流量制御機器等と共に集積して流体制御装置(ガスボックス)を構成する。
バルブボディ1は図2及び図3に示されるように、流路が形成された基台部11と、基台部11上に設けられた略円筒形状の円筒部12とからなる。
基台部11は平面視矩形状からなり、複数の流体制御機器V1によってユニット化された流体制御装置を構成する場合には、基板あるいはマニホールドブロック上に設置される部分となる。
この円筒部12には、軸心方向に長さを有し、ボンネット部2が配設される側であって基台部11とは反対側の一端が開口すると共に、外側から凹部12a側へ貫通したスリット12bが設けられている。このスリット12bを介して、ボンネットウォール25から延び出したフレキシブルケーブル51が内側から外側へ導出される。
ボンネット部2は図2~図4に示されるように、バルブボディ1の凹部12a内に収容した状態に配設される。
このボンネット部2は、シート21、ダイヤフラム22、ダイヤフラム押え23、ボンネット24、ボンネットウォール25を備えるほか、流体の漏出に伴う圧力変化の検出精度を高めるための弾性体6を有している。
このダイヤフラム押え23は、略円柱状の基体部231と、ダイヤフラム22に当接する側の一端側において拡径した拡径部232からなる。
また、この拡径部232は、ピストン43に連動したダイヤフラム押え23の上下動に応じて、ボンネット24の仕切部241との間で弾性体6を挟圧する。
これにより、他の位置をピストン43の上下動の上死点とする場合と異なり、開弁時にダイヤフラム押え23の拡径部232が到達する位置に余裕を持たせる必要がなく、閉空間S2の体積を最小限に抑えることができる。
このボンネット24は、下端部においてバルブボディ1との間にダイヤフラム22を挟持しており、この部分でダイヤフラム22とバルブボディ1との間がシールされる。
仕切部241の上方ないしは、アクチュエータ部4が配設される側に形成される凹部24aには、ボンネットウォール25が収容される。仕切部241とボンネットウォール25には夫々、互いに対応する位置にネジ穴241bと貫通孔25eが設けられており、ボンネット24にボンネットウォール25がボルト25fによって螺設される。
なお、ここにいう閉空間S2の近傍とは少なくとも、上下動するダイヤフラム押え23の動作方向において、ダイヤフラム押え23とピストン43が当接する側よりも閉空間S2側に偏った位置をいい、さらに好適には、OリングO2とダイヤフラム押え23の拡径部232が接することなく隔てられる最小限の距離を保持できる位置をいう。
弾性体6は、外力に応じて弾性的に膨縮する部材であって、外面が非多孔質材料でコーティングされた多孔質の軟性樹脂等からなる。また、本例では一定の厚みを有するリング状に構成され、中央にはダイヤフラム押え23の基体部231が貫挿される貫挿孔6aが設けられている。
これにより、流体制御機器V1の弾性体6の分だけ閉空間S2に占める気体の容積を減じることができる。
カバー部3は図1及び図5に示されるように、アクチュエータボディ41とバルブボディ1を挟圧して一体的に保持すると共に、回路基板52及び回路基板52に設けられたコネクタ53を流体制御機器V1に固定する固定手段を構成する。
このカバー部3は、カバー31と平板状のプレート32、33を備える。
カバー31の両側面には、アクチュエータボディ41が嵌め込まれる位置に対応してネジ孔31aが設けられている。これにより、バルブボディ1が内側にはめ込まれた状態でネジ孔31aにネジ31bを螺入させ、ネジ31bの先端をバルブボディ1に圧接させると、バルブボディ1をカバー31の内側に挟持することができる。
このプレート32の下方には、舌片状に切り欠いた切欠部32aが形成されており、フレキシブルケーブル51はこの切欠部32aを介して、コネクタ53が設けられた回路基板52へ導出される。
このプレート33には、中央部に略矩形状の貫通孔33aが設けられており、回路基板52に設けられたコネクタ53はこの貫通孔33aから外側へ抜け出る。
アクチュエータ部4は、ボンネット部2上に配設される。
このアクチュエータ部4は図2に示されるように、アクチュエータボディ41、アクチュエータキャップ42、ピストン43、バネ44を備える。なお、図3においては、アクチュエータ部4の内部構造を省略しているが、内部構造は図2に示されるとおりである。
このアクチュエータボディ41は図3に示されるように略円柱形状からなり、中心部には、ピストン43とダイヤフラム押え23が貫挿される貫挿孔41aが長さ方向に沿って設けられている。図2に示されるように、貫挿孔41a内ではピストン43とダイヤフラム押え23が当接しており、ダイヤフラム押え23はピストン43の上下動に連動して上下動する。
アクチュエータキャップ42の上端面には、ピストン43の駆動圧導入路432に連通する開口部42aが設けられている。
アクチュエータキャップ42の下端部は、アクチュエータボディ41の上部が螺合して閉止されている。
このピストン43の軸心方向略中央は円盤状に拡径しており、当該箇所は拡径部431を構成している。ピストン43は、拡径部431の上面側においてバネ44の付勢力を受ける。また、拡径部431の下端側には、駆動圧が供給される駆動圧導入室S1が形成される。
一方、駆動圧導入室S1にエアが導入されなくなると、ピストン43がバネ44の付勢力に従って下方に押し下げられる。これにより、ダイヤフラム22がシート21に当接して閉弁した状態となって、流体の流通が遮断される。
流体制御機器V1は、機器内の動作を検出するためのセンサとして、圧力センサPと、磁石M1と磁性体M2からなる磁気センサを備えている。
圧力センサPは図2に示されるように、ボンネットウォール25の下面、ないしは流路側に取り付けられており、連通孔241dを介して、ダイヤフラム22、ボンネット24の仕切部241、及びダイヤフラム押え23によって画定された閉空間S2に連通している。この圧力センサPは、圧力変化を検出する感圧素子や、感圧素子によって検出された圧力の検出値を電気信号に変換する変換素子等によって構成される。これにより圧力センサPは、ダイヤフラム22、ボンネット24の仕切部241、及びダイヤフラム押え23によって画定された閉空間S2内の圧力を検出することができる。
なお、圧力センサPが連通孔241dに通じる箇所にはパッキン26が介装されており、気密状態が担保されている。
また、本実施形態では、閉空間S2内の圧力変化を圧力センサPによって検出することにより、流体の漏出等に起因した流体制御機器V1の異常を検知するが、コンデンサ型マイクロホンユニットを圧力センサPとして用いることが可能である。即ち、コンデンサ型マイクロホンユニットは、音波を受けて振動する振動板と、振動板に対向して配置された対向電極を有し、振動板と対向電極との間の静電容量の変化を電圧の変化に変換して音声信号とすることができる。そして、このコンデンサ型マイクロホンユニットは、振動板の背面側に設けられる空気室を塞ぐことで無指向性(全指向性)となる。無指向性の場合、コンデンサ型マイクロホンユニットはあらゆる方向からの音波による音圧の変化をとらえて動作するため、圧力センサとして利用することが可能となる。
この磁気センサによって以下の通り、弁の開閉動作を検知することができる。即ち、磁石M1がダイヤフラム押え23の上下動に応じて上下動するのに対し、磁性体M2はボンネットウォール25及びボンネット24共にバルブボディ1内に固定されている。この結果、ダイヤフラム押え23の上下動に従って上下動する磁石M1と、位置が固定されている磁性体M2との間に発生する磁界の変化に基づき、ダイヤフラム押え23の動作、ひいては弁の開閉動作を検知することができる。
なお、本実施形態では磁気センサを用いたが、これに限らず、他の実施形態においては、光学式の位置センサ等、他の種類のセンサを用いることもできる。
本例において、回路基板52には、所定の情報処理を実行する処理モジュール7(図7を参照して後述)が構成されている。処理モジュール7は、圧力センサPや磁気センサから取得した情報に基づき、流体制御機器V1の異常を検知する処理を実行する。そして、回路基板52には外部端子接続用の略矩形状のコネクタ53が設けられており、これにより、圧力センサPと磁気センサによって測定されたデータを抽出したり、処理モジュール7によって実行された異常判別処理の処理結果に係るデータを抽出したりすることができる。
また、処理モジュール7は回路基板52とは別に、流体制御機器V1内に格納されていてもよいし、圧力センサP又は磁気センサの一部として構成されていてもよい。
また、コネクタ53の種類や形状は、各種の規格に応じて適宜に設計し得る。
以上の構成からなる流体制御機器V1において、閉空間S2内の圧力変化に基づいて流体制御機器V1の異常を判別する処理の一例を述べる。
処理モジュール7は、回路基板52上に設けられた演算回路やメモリによって構成され、これにより図6に示されるように、判別処理部71と通信処理部72からなる機能ブロックを備える。この処理モジュール7は、フレキシブルケーブル51によって圧力センサPや磁気センサと連携可能に構成されており、当該圧力センサPや磁気センサからデータの供給を受けることができるようになっている。
また、外部端末8に対して、流体制御機器V1ごとに異なるタイミングで判別結果が送信されることで、パケット衝突の問題を回避することができるし、一斉に送信される場合と比べて一時的な処理の過負荷を防ぐこともできる。さらに、一斉に送信される場合と違い、データ送信に利用される無線のチャンネルを流体制御機器V1ごとに変える必要がないため、多くのチャンネルを用意する必要がない。流体制御機器V1と外部端末8の接続手段をBluetooth(登録商標)によって実現する場合には、同時接続台数が限られるため(通常7台)、送信のタイミングを変えることで同時接続台数を超える数の流体制御機器V1を用いることができる。
この外部端末8は、流体制御機器V1の閉空間S2への流体の漏出の判別結果を受信するための通信処理部を有している。外部端末8が流体制御機器V1から受信した情報は適宜、流体制御機器V1の管理者あるいは監視者等が利用する端末からの求めに応じて、当該監視者等が利用する端末に提供される。
また、流体制御機器V1の異常に関する情報が外部端末8に集約されるため、流体制御機器V1の監視者等は、流体制御機器V1の動作状況を負担なく監視することができる。
さらに、流体制御機器V1は、閉空間S2内の圧力を検出した上、所定の閾値と検出値とを比較することによって異常を検知するため、閉空間S2内が負圧となる異常を来した場合でも、これを検知することができる。
図7及び図8に示されるように、本実施形態に係る流体制御機器V2は、ボンネット24に弾性体9を収容する収容部24bを備えたものである。
なお、本実施形態に係る流体制御機器V2の説明においては、上述した第一の実施形態に係る流体制御機器V1の変形例として流体制御機器V2に言及することとし、同一の機能や構成を有する部材に対しては流体制御機器V1と同一の符号を付して説明を省略することとする。
弾性体9は上述した弾性体6と同様、外力に応じて弾性的に膨縮する部材であって、外面が非多孔質材料でコーティングされた多孔質の軟性樹脂等からなる。また、本例においても略リング状に構成され、中央にはダイヤフラム押え23の基体部231が貫挿される貫挿孔9aが設けられている。
これにより本例では、第一の実施形態に係る流体制御機器V1が有したOリングO2を設けなくてもよい。ただし、このことはOリングO2を別途、設けることを妨げるものではなく、第一の実施形態と同様にOリングO2を設けてもよい。
また、上述した第一の実施形態に係る流体制御機器V1が備えたOリングO2を備えるものとすれば、シール部91を設けることなく、弾性体9を膨縮部92のみからなるものとすることもできる。この場合、流体制御機器V2の開弁時、ダイヤフラム押え23からの押圧力によって、弾性体9の一部又は全部が収容部24bに収容される。
2 ボンネット部
21 シート
22 ダイヤフラム
23 ダイヤフラム押え
231 基体部
232 拡径部
24 ボンネット
24a 凹部
24b 収容部
241 仕切部
241a 貫挿孔
25 ボンネットウォール
3 カバー部
4 アクチュエータ部
51 フレキシブルケーブル
52 回路基板
53 コネクタ
6 弾性体
6a 貫挿孔
7 処理モジュール
8 外部端末
9 弾性体
9a 貫挿孔
91 シール部
92 膨縮部
M1 磁石
M2 磁性体
O1、O2 Oリング
P 圧力センサ
S1 駆動圧導入室
S2 閉空間
V1、V2 流体制御機器
Claims (6)
- 流路と隔離された閉空間内の圧力を検知する流体制御機器であって、
前記流路が形成されたバルブボディと、
前記流路における流体の流通を許容又は遮断すると共に、前記閉空間を前記流路から隔離する隔離部材と、
前記バルブボディ上に配設されて前記隔離部材との間に前記閉空間を形成すると共に、前記閉空間に連通し、ダイヤフラム押えが上下動可能に貫挿される貫挿孔が設けられたボンネットと、
前記貫挿孔内を上下動して前記隔離部材を押圧すると共に、前記貫挿孔から抜出不能とする拡径部が設けられた前記ダイヤフラム押えと、
前記閉空間内の圧力を検出する圧力センサと、
前記閉空間内において、前記ダイヤフラム押えの拡径部と前記ボンネットの間に介在し、前記ダイヤフラム押えの上下動に伴って前記ダイヤフラム押えの拡径部と前記ボンネットの間で弾性的に膨縮する弾性体と、を有する、
流体制御機器。 - 前記ボンネットには、前記閉空間側に開口し、前記弾性体を収容する収容部が設けられており、
前記弾性体は、前記ダイヤフラム押えの上下動に伴って膨縮すると共に、圧縮時には弾性変形して前記収容部に収容される、
請求項1記載の流体制御機器。 - 前記収容部は、前記貫挿孔のうち、前記閉空間の近傍において拡径した部分として構成され、
前記弾性体は、前記貫挿孔の内周面と前記ダイヤフラム押えの間をシールする、
請求項2記載の流体制御機器。 - 前記弾性体は、自然状態において、前記閉空間とは反対の側に空隙を形成して前記収容部に収容されている、
請求項2又は3記載の流体制御機器。 - 前記閉空間内で上下動する前記ダイヤフラム押えの拡径部の位置が、前記ダイヤフラム押えに連動するピストンの上死点を規定する、
請求項1乃至4いずれかの項に記載の流体制御機器。 - 前記閉空間の近傍において、前記貫挿孔の内周面と前記ダイヤフラム押えの間をシールするシール部材、をさらに有する、
請求項1乃至5いずれかの項に記載の流体制御機器。
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