JP3606956B2 - Volume change valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a volume change valve, and more particularly, to a volume change valve that can prevent dripping of fluid from a discharge port of a fluid tube when the flow of fluid is stopped by an electromagnetic valve that allows and stops the flow of fluid.
[0002]
[Prior art]
In recent technology, various fluids are used for manufacturing products and chemical analysis of substances, and various devices for controlling such fluids have been proposed. Various devices are provided in the device for controlling the fluid in order to control the supply of the fluid according to the required amount.
[0003]
Valves that control the flow rate are valves that control using a motor, such as valves that allow or stop the flow of fluid using a solenoid, or valves that control the flow of fluid proportionally using a proportional solenoid. Etc.
[0004]
[Problems to be solved by the invention]
By the way, when the flow of the fluid is stopped by an electromagnetic valve that allows and stops the flow of the fluid, there is a problem that the fluid in the fluid tube that forms the fluid passage from the electromagnetic valve to the discharge port hangs down from the discharge port.
[0005]
This is caused by inertia toward the fluid discharge port, a pushing force to the fluid discharge port by the stop operation of the electromagnetic valve, and the like.
[0006]
For this reason, when fluid sag occurs, supply of a required amount of fluid is impaired, and there is a disadvantage that accurate manufacture of products and quantitative analysis of substances cannot be performed.
[0007]
[Means for Solving the Problems]
Accordingly, the present invention provides a valve mechanism portion driven by an actuator portion, and the actuator portion has a push pin as a shaft member that is driven in the axial direction toward the valve mechanism portion by a drive mechanism in which a solenoid is mounted on a fixed iron core. A plunger that is held so as to be movable in the axial direction is provided, and the valve mechanism is provided with a body that is interposed in the middle of a fluid tube that forms a fluid passage from an electromagnetic valve that allows and stops fluid flow to a fluid discharge port. , this body is provided an outlet port fluid tube of the discharge port side is connected provided with an inlet port for fluid tube of the solenoid valve side is connected, with the intermediate passage communicating with these inlet and outlet ports provided the volume change chamber partitioned by the diaphragm with communicates with passage, the actuator unit side across the intermediate passage A first guide groove directed in a direction crossing the axial direction of the shaft member is provided, provided a built-in first shift plate to be movable in the axial direction of the first is the shaft member into the guide groove plunger, this An end portion of a push pin that constitutes the shaft member is provided in contact with a central portion of the first shift plate on the actuator portion side, and the first guide is provided on the opposite side of the first guide groove with the intermediate path therebetween. A second guide groove parallel to the groove is provided, and a second shift plate is provided in the second guide groove so as to be movable in the axial direction of the plunger that is the shaft member. The diaphragm is attached to a central portion, and a spring is elastically biased on the opposite side of the intermediate path of the second shift plate, and both the intermediate path side of the first shift plate are provided. Site provided two shift pins being the intermediate roadside abut respectively other end across the site of the second shift plate while being abutted respectively one end to permit flow of fluid through the solenoid valve The solenoid constituting the drive mechanism is de-energized, the diaphragm is moved in the direction approaching the intermediate path by the spring, the volume of the volume change chamber is set to a steady state volume, and the solenoid valve When the flow of fluid is stopped by the solenoid, the solenoid constituting the drive mechanism is energized, the plunger constituting the shaft member is axially driven toward the valve mechanism portion, and the first shift is performed by the push pin of the plunger. The diaphragm is moved in a direction away from the intermediate path through the plate, the second shift plate, and the two shift pins to increase the volume of the volume change chamber. It is characterized by making it.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The volume change valve of the present invention is interposed in the middle of a fluid tube from the solenoid valve that allows / stops fluid flow of the fluid control device to the discharge port , and is driven when fluid flow is allowed by the solenoid valve. When the solenoid that constitutes the mechanism is de-energized, the diaphragm is moved in the direction close to the intermediate path by the spring, the volume of the volume change chamber is set to the steady state volume, and the fluid is stopped by the solenoid valve The solenoid constituting the drive mechanism of the actuator portion is excited, the plunger constituting the shaft member is axially driven toward the valve mechanism portion, and the first shift plate and the second shift of the valve mechanism portion are driven by the push pin of the plunger. By moving the diaphragm away from the intermediate path through the plate and the two shift pins, the volume change chamber communicated with the intermediate path Increasing the product, increasing the volume of the fluid passageway in communication with the intermediate passage. As a result, the volume change valve can increase the volume of the fluid passage when the fluid is stopped by the solenoid valve, and can increase the inertia toward the fluid discharge port and the pushing force to the fluid discharge port by the stop operation of the solenoid valve. Can be offset.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 and 2 show an embodiment of the present invention. In FIG. 1, 2 is a fluid control device, 4 is a control unit, 6 is a solenoid valve, 8 is a fluid tube, and 10 is a volume change valve. The fluid control device 2 controls the operation of the electromagnetic valve 6 by the control unit 4 to allow / stop the flow of the fluid in the fluid tube 8.
[0011]
The electromagnetic valve 6 includes an actuator unit 12 and a valve mechanism unit 14. The actuator unit 12 is provided with a fixed iron core 16 provided with a solenoid 18, and provided with a plunger 20 driven axially toward the valve mechanism unit 14 by the solenoid 18, and the plunger 20 is provided on one end side of the push pin 22. The end portion is attached and inserted through the insertion hole 24 of the fixed iron core 16. The solenoid 18 is connected to the control unit 4 by an electric circuit W.
[0012]
The valve mechanism portion 14 is provided with an inlet port 28 and an outlet port 30 in a body 26 attached to the fixed iron core 16. A fluid supply source (not shown) is connected to the inlet port 28. One end side of the fluid tube 8 is connected to the outlet port 30. The fluid tube 8 is provided with a discharge port 32 on the other end side to form a fluid passage 34.
[0013]
The valve mechanism section 14 is provided with a passage 36 that communicates the inlet port 28 and the outlet port 30, and a diaphragm 38 that opens and closes the passage 36 is attached to the shift plate 40. The shift plate 40 is disposed on the push pin 22 side. A spring 42 to be pressed is provided, and the other end side of the push pin 22 is brought into contact with the shift plate 40.
[0014]
When the solenoid 18 is de-energized by the control unit 4, the solenoid valve 6 moves the diaphragm 38 in a direction away from the passage 36 by the spring 42 to open the passage 36 and allow the fluid to flow. Further, when the solenoid 18 is energized by the controller 4, the solenoid valve 6 moves the diaphragm 38 in the direction approaching the communication path 36 via the shift plate 40 by the push pin 22 of the plunger 20, thereby passing the path 36. To stop fluid flow.
[0015]
The volume change valve 10 is interposed in the middle of a fluid tube 8 that forms a fluid passage 34 from the electromagnetic valve 6 that allows and stops fluid flow to the fluid discharge port 32. The volume change valve 10 is provided with an actuator portion 42 and a valve mechanism portion 44 driven by the actuator portion 42.
[0016]
As shown in FIG. 2, the actuator unit 42 is provided with a solenoid 50 mounted on a fixed iron core 48 as a drive mechanism in a housing 46, and a plunger 52 as a shaft member is held in the solenoid 50 so as to be movable in the axial direction. doing. The solenoid 50 is connected to the control unit 4 by an electric circuit W. The plunger 52 is axially driven by the solenoid 50 toward the valve mechanism 44.
[0017]
The plunger 52 is formed in a hollow cylindrical shape with a holding hole 54, and is supported at one end side by a magnetic core 56 so as to be movable in the axial direction. The magnetic core 56 is fixed to the housing 46 by a clip 58. The large-diameter portion 62 of the push pin 60 is held in the holding hole 54 of the plunger 52 so as to be movable in the axial direction. The small diameter portion 64 of the push pin 60 is held in the insertion hole 66 of the fixed iron core 48 so as to be movable in the axial direction.
[0018]
The push pin 60 is rotatably provided at one end side of the large diameter portion 62 in the holding hole 54 of the plunger 52 by a screw mechanism 68. When the push pin 60 is rotated, the plunger 52 and the push pin 60 are relatively moved by the screw mechanism 68, and the clearance S between the plunger 52 and the fixed iron core 48 is increased or decreased. Thereby, the plunger 52 can adjust a stroke.
[0019]
The valve mechanism 44 is provided with a body 70 interposed in the middle of the fluid tube 8 that forms a fluid passage 34 from the electromagnetic valve 6 that allows and stops fluid flow to the fluid discharge port 32. Therefore, the fluid tube 8 is divided into a fluid tube 8-1 on the electromagnetic valve 6 side and a fluid tube 8-2 on the discharge port 32 side.
[0020]
The body 70 is attached to the fixed iron core 48 of the actuator part 42. The body 70 is provided with an inlet port 72 to which the fluid tube 8-1 on the electromagnetic valve 6 side is connected and an outlet port 74 to which the fluid tube 8-2 on the discharge port 32 side is connected. The inlet port 72 and the outlet port 74 are communicated with each other through an intermediate path 76.
[0021]
On the opposite side of the intermediate passage 76 from the actuator portion 42, a recess 80 is provided that communicates with the intermediate passage 76 through a communication passage 78. The body 70 is provided with a volume change chamber 86 partitioned by a diaphragm presser 84 around the diaphragm 82 so as to cover the recess 80.
[0022]
The body 70 is provided with a first guide groove 88 recessed in the direction intersecting the axial direction of the plunger 52, which is a shaft member, on the actuator portion 42 side with the intermediate path 76 interposed therebetween. The first guide groove 88 is provided with an elongated plate-shaped first shift plate 90 that is movable in the axial direction of the plunger 52. The first shift plate 90 is provided with the end portion of the small-diameter portion 64 of the push pin 60 constituting the shaft member in contact with the central portion on the actuator 42 side.
[0023]
The diaphragm presser 84 attached to the body 70 is directed to the opposite side of the first guide groove 88 across the intermediate path 76 in the direction intersecting the axial direction of the plunger 52 that is the shaft member, and the first guide groove 88. A parallel second guide groove 92 is provided. The second guide groove 92 is provided with an elongated plate-shaped second shift plate 94 that is movable in the axial direction of the plunger 52.
[0024]
The second shift plate 94 is provided with the central portion of the diaphragm 82 attached to the central portion on the intermediate passage 76 side, and a spring 96 is provided on the opposite side of the intermediate passage 76 by elastic biasing. One end of the spring 96 is elastically supported on the second shift plate 94, and the other end is supported on the support hole 100 of the base 98 attached to the fixed iron core 48 together with the body 70. Is elastically biased toward the intermediate path 76 side.
[0025]
The body 70 and the diaphragm retainer 84 are provided with fitting insertion holes 102 and 102 that respectively connect the longitudinal end portions of the first guide groove 88 and the longitudinal end portions of the second guide groove 92. Shift pins 104 and 104 are inserted into these two insertion holes 102 and 102, respectively, so as to be movable in the axial direction. The shift pins 104 and 104 are formed in such a length that both ends slightly protrude from both end portions of the first guide groove 88 and the second guide groove 92.
[0026]
The two shift pins 104 and 104 are respectively brought into contact with both end portions of the first shift plate 90 on the intermediate path 76 side, and are fitted into the insertion holes 102 and 102 to be inserted into the second shift plate 94. The other end side is brought into contact with both end portions on the intermediate path 76 side.
[0027]
The volume change valve 10 is moved by the control unit 4 in a direction in which the solenoid 50 is de-energized when the solenoid valve 6 permits fluid flow, and the spring 96 moves the diaphragm 82 in the direction approaching the intermediate path 76. The volume of the volume change chamber 86 is set to a steady state volume.
[0028]
Further, in the volume change valve 10, the solenoid 50 is energized by the controller 4 when the fluid flow is stopped by the electromagnetic valve 6, and the first shift plate 90 and the second shift plate are pushed by the push pin 60 of the plunger 52. The diaphragm 82 is moved in a direction away from the intermediate passage 76 via the 94 and the two shift pins 104 and 104, and the volume of the volume change chamber 86 is increased.
[0029]
Next, the operation will be described.
[0030]
The fluid control device 2 controls the operation of the electromagnetic valve 6 by the control unit 4 to allow / stop the flow of the fluid in the fluid tube 8.
[0031]
When the solenoid 18 is de-energized by the controller 4, the solenoid valve 6 moves the diaphragm 38 away from the passage 36 by the spring 42, thereby opening the passage 36. The fluid is allowed to flow, flows through the fluid passage 34 in the fluid tube 8, and is discharged from the discharge port 32.
[0032]
Further, when the solenoid 18 is energized by the controller 4, the solenoid valve 6 moves the diaphragm 38 through the shift plate 40 in a direction approaching the communication path 36 by the push pin 22 of the plunger 20, thereby Close. The fluid is stopped from flowing and does not flow through the fluid passage 34 in the fluid tube 8, and the discharge from the discharge port 32 is stopped.
[0033]
At this time, the fluid in the fluid passage 34 is caused by the inertia toward the discharge port 32 or the pushing force of the fluid toward the discharge port 32 due to the stop operation of the diaphragm 38 of the solenoid valve 6 approaching the communication passage 36. In spite of the stop operation of 6, it moves toward the discharge port 32 and tries to drip from the discharge port 32.
[0034]
In the volume change valve 10 interposed in the fluid tube 8, when the fluid flow is allowed by the electromagnetic valve 6 by the control unit 4, the solenoid 50 is de-energized, and the diaphragm 82 is moved to the intermediate path 76 by the spring 96. The volume is moved in the approaching direction, and the volume of the volume change chamber 86 is set to a steady state volume.
[0035]
Thus, the volume of the fluid passage 34 reaching the discharge port 32 in the fluid tube 8 is kept constant, and the fluid is discharged from the discharge port 32.
[0036]
Further, the volume change valve 10 is energized by the control unit 4 when the fluid flow is stopped by the electromagnetic valve 6, and the first shift plate 90 and the second shift plate are pushed by the push pin 60 of the plunger 52. The diaphragm 82 is moved in a direction away from the intermediate passage 76 via the 94 and the two shift pins 104 and 104, and the volume of the volume change chamber 86 is increased.
[0037]
As a result, the volume of the fluid passage 34 in the fluid tube 8 that communicates with the volume change chamber 86 through the intermediate path 74 and the communication passage 78 is increased, so that the fluid in the fluid tube 8 is transferred to the volume change chamber 86. It is possible to cancel the inertia toward the fluid discharge port 32 and the pushing force to the fluid discharge port 32 due to the stop operation of the electromagnetic valve 6.
[0038]
For this reason, the volume change valve 10 can prevent the fluid from dripping from the discharge port 32 of the fluid tube 8 when the fluid flow is stopped by the electromagnetic valve 6 that allows and stops the fluid flow. As a result, the variable volume valve 10 can eliminate the inconvenience that the supply of the required amount of fluid by the fluid control device 2 is impaired by preventing the fluid from dripping, so that the manufacture of products and the quantitative analysis of substances can be performed accurately. The inconvenience that is not performed can be solved.
[0039]
The volume of the volume change chamber 86 is increased by rotating the push pin 60 relative to the plunger 52 and moving it relative to the plunger mechanism 68 to increase or decrease the gap S between the plunger 52 and the magnetic core 56. Can be changed. As a result, the volume of the volume change chamber 86 can be set as desired according to the volume of the fluid passage 34 extending from the electromagnetic valve 6 to the discharge port 32 in the fluid tube 8, and the fluid tubes of different lengths can be set. 8 can be easily accommodated.
[0040]
In this embodiment, the solenoid 50 is exemplified as the drive mechanism of the actuator portion 42 of the volume change valve 10. However, a motor, a pneumatic cylinder, a hydraulic cylinder, or the like may be used.
[0041]
【The invention's effect】
Thus, according to the present invention, the volume change valve increases the volume of the fluid passage leading to the fluid discharge port when the fluid is stopped by the electromagnetic valve, and is based on the inertia toward the fluid discharge port and the stop operation of the electromagnetic valve. The pushing force of the fluid to the discharge port can be offset.
[0042]
For this reason, this volume change valve can prevent fluid from dripping from the discharge port of the fluid tube when the fluid flow is stopped by an electromagnetic valve that allows / stops the fluid flow. Inconveniences that cause damage to products, and inconveniences that product manufacturing and quantitative analysis of substances cannot be performed accurately can be solved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a volume change valve in use according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a volume change valve.
[Explanation of symbols]
2 Fluid control device 4 Control unit 6 Solenoid valve 8 Fluid tube 10 Volume change valve 12 Actuator unit 14 Valve mechanism unit 32 Discharge port 34 Fluid passage 42 Actuator unit 44 Valve mechanism unit 48 Fixed iron core 50 Solenoid 52 Plunger 60 Push pin 70 Body 72 Inlet port 74 Outlet port 76 Intermediate path 82 Diaphragm 84 Diaphragm retainer 86 Volume change chamber 88 First guide groove 90 First shift plate 92 Second guide groove 94 Second shift plate 96 Spring 98 Base 102/102 Insertion hole 104 / 104 Shift pin

Claims (1)

A valve mechanism driven by an actuator is provided, and the actuator holds a push pin as an axial member that is axially driven toward the valve mechanism by a drive mechanism having a solenoid on a fixed iron core. The valve mechanism portion is provided with a body interposed in the middle of a fluid tube that forms a fluid passage from an electromagnetic valve that allows / stops fluid flow to a fluid discharge port. An inlet port to which a fluid tube on the solenoid valve side is connected and an outlet port to which the fluid tube on the discharge port side is connected are provided, and an intermediate path communicating with the inlet port and the outlet port is communicated by a communication passage. A volume change chamber partitioned by a diaphragm is provided, and the axial direction of the shaft member is on the actuator portion side across the intermediate path A first guide groove oriented in the direction crossing provided, provided a built-in first shift plate to be movable in the axial direction of the first is the shaft member into the guide groove plunger, the actuator of the first shift plate A second guide parallel to the first guide groove on the opposite side of the first guide groove across the intermediate path is provided in contact with the end portion of the push pin constituting the shaft member at a central portion on the part side. A groove is provided, and a second shift plate is provided in the second guide groove so as to be movable in the axial direction of the plunger as the shaft member , and the diaphragm is attached to a central portion of the second shift plate on the intermediate path side. And provided with a spring elastically biased to the opposite side of the intermediate path of the second shift plate, and one end side of each end portion of the first shift plate on the intermediate path side. The two shift pins that contacts the respective other end on both ends portion of the intermediate roadside of the second shift plate with the contact provided in the case to allow the flow of fluid through the solenoid valve, the driving mechanism The constituting solenoid is de-energized, the diaphragm is moved in the direction approaching the intermediate path by the spring, the volume of the volume change chamber is set to a steady state volume, and the flow of fluid is stopped by the solenoid valve. In this case, the solenoid constituting the drive mechanism is energized, the plunger constituting the shaft member is axially driven toward the valve mechanism portion, and the first shift plate and the second shift plate are driven by the push pin of the plunger. The diaphragm is moved in a direction away from the intermediate path via two shift pins, and the volume of the volume change chamber is increased . Volume change valve.

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