JP5382862B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device for adjusting or opening / closing a flow rate of a fluid flowing through a flow path.

  For example, pipes in factories that are intended to transport liquids have multiple pipes integrated, branched, and connected to various devices, so valve devices are provided for flow rate adjustment, pressure adjustment, and flow path opening / closing. There are many cases. In such a valve device, a ball valve, a butterfly valve, and a needle valve are usually used.

  In these valve devices, a packing is used for sealing with a shaft for moving the valve. For example, the portion has a structure in which the liquid can accumulate, and thus the liquid tends to stay. Also, if there are impurities in the liquid, these impurities will accumulate at the seal part with the shaft, causing the valve not to operate smoothly or causing damage to the packing.

  For example, a plate-like valve having rubber elasticity is used, and when water pressure or atmospheric pressure is applied from the opposite side of the opening provided with this valve, it is opened, and there is an excellent sealability and durability (patent) Reference 1).

JP 2000-87412 A

  However, even when a plate-like valve having rubber elasticity is used, liquid accumulates at the seal portion with the shaft, and impurities accumulate, which effectively prevents the valve from operating smoothly or damaging the packing. I couldn't.

  It is an object of the present invention to provide a valve device that solves these problems, avoids fluid stagnation, operates smoothly, and improves durability.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 is a valve body connected to the pipe;
A flexible pipe inserted into the valve body and having a flow path;
Valve drive means for changing the cross-sectional area of the flow path by pushing the flexible pipe,
The valve body has a recess that allows a change in the cross-sectional area of the flow path of the flexible pipe,
The valve driving means includes
First and second actuating members that are arranged in symmetrical directions across the flexible pipe and that change the cross-sectional area of the flow path of the flexible pipe;
First and second drive shafts for moving the first and second actuating members across the flexible pipe;
Gear mechanisms for rotating the first and second drive shafts in opposite directions;
Operating means for driving the gear mechanism,
The first drive shaft includes a screw portion that moves the first operating member and a guide portion that guides the movement of the second operating member,
The second drive shaft has a screw part that moves the second operating member and a guide part that guides the movement of the first operating member,
The first and second drive shafts are rotated in opposite directions by the operation means via the gear mechanism,
The first and second actuating members are moved in the proximity direction or the separation direction across the flexible pipe so as to change the cross-sectional area of the flow path of the flexible pipe,
The first actuating member is moved by a screw portion of the first drive shaft, and can be guided by a guide portion of the second drive shaft,
The second actuating member can be moved by a screw portion of the second drive shaft and guided by a guide portion of the first drive shaft,
The gear mechanism is
It consists of a center gear, a first gear, and a second gear,
The first gear is attached to the first drive shaft;
The second gear is attached to the second drive shaft;
The central gear meshes between the first gear and the second gear, and when the central gear is rotated, the first gear and the second gear rotate in opposite directions,
The first drive shaft and the second drive shaft are interlocked and rotated in opposite directions,
The operation means comprises an operation knob,
The operation knob enables the central gear to rotate;
The axis of rotation of the central gear, is positioned in the flexible pipe flow path on,
In the valve device, the operation knob is disposed between the first drive axis and the second drive axis.

A second aspect of the present invention is the valve device according to the first aspect, wherein the first and second actuating members have bushes at least in contact with the flexible pipe.

A third aspect of the present invention is the valve device according to the first aspect, wherein a part of the flexible pipe is bent to close the flow path.

With the above configuration, the present invention has the following effects.

In the first aspect of the present invention, the first and second drive shafts are rotated in the opposite directions by the operating means via the gear mechanism, and the first and second actuating members are brought close to each other with the flexible pipe interposed therebetween. The flow rate of the fluid flowing through the flow path is changed by changing the cross-sectional area of the flow path of the flexible pipe by moving in the direction or the separation direction. Adjusts or opens / closes, eliminating the seal part with the shaft in the flow path, avoiding stagnation of fluid, eliminating the biting of impurities, etc., the valve operates smoothly, and the seal member is not damaged It is possible to improve the performance.

According to a second aspect of the present invention, the first and second actuating members have a bush at least in contact with the flexible pipe, and the pressing force is reduced by the bush, so that the durability of the flexible pipe is improved. To do.

In the invention according to claim 3 , a part of the flexible pipe has a deflection that closes the flow path, thereby smoothly changing the cross-sectional area of the flow path and adjusting the flow rate of the fluid flowing through the flow path. Or it can be opened and closed, and the responsiveness of the valve operation is good.

It is a front view of the valve apparatus of a reference example 1st embodiment. It is a side view of the valve apparatus of a reference example 1st embodiment. It is a top view of the valve apparatus of a reference example 1st embodiment. It is sectional drawing which shows the valve closed state of a valve apparatus. It is sectional drawing which shows the valve open state of a valve apparatus. It is sectional drawing which shows the bush of an operation member. It is a front view of the 1st body. It is a joint surface figure of the 1st body. It is a non-joining surface view of the first body. It is a left view of the 1st body. It is a right view of the 1st body. It is sectional drawing of a 1st body. It is a front view of the 2nd body. It is a joint surface figure of the 2nd body. It is a non-joining surface view of the second body. It is a left view of the 2nd body. It is a right view of the 2nd body. It is sectional drawing of a 2nd body. It is sectional drawing which shows the valve closed state of the valve apparatus of reference example 2nd Embodiment. It is sectional drawing which shows the valve open state of the valve apparatus of 1st Embodiment. It is a top view which shows the drive mechanism of the valve apparatus of 1st Embodiment. It is a front view of the valve apparatus of reference example 3rd Embodiment. It is a top view of the valve apparatus of reference example 3rd Embodiment. It is sectional drawing of the valve apparatus of reference example 3rd Embodiment. It is sectional drawing which follows the XXIV-XXIV line | wire of FIG.

  Hereinafter, embodiments of the valve device of the present invention will be described. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this. For example, pipes in factories that are intended to transport liquids have multiple pipes integrated, branched, and connected to various devices, so valve devices are provided for flow rate adjustment, pressure adjustment, and flow path opening / closing. Often implemented in such valve devices.

[ Reference Example First Embodiment]
As shown in FIGS. 1 to 6, the valve device 1 of the first embodiment includes a valve body 10, a flexible pipe 20, and a valve driving means 30. The valve drive means 30 includes first and second actuating members 31 and 32, first and second drive mechanisms 34 and 35, and an operation means 36.

  The valve body 10 is formed of a metal such as an aluminum alloy or SUS, an alloy, a reinforced resin, or the like, and includes a first body 11 and a second body 12 and is connected to the pipe 100.

  As shown in FIGS. 7 to 12, the first body 11 is formed in a square block shape, and a pipe housing portion 11a having a semicircular cross section for housing the flexible pipe 20 is formed on the joining surface side. In the central part of the pipe housing part 11a, recesses 11b are formed on both sides of the pipe housing part 11a to allow a change in the cross-sectional area of the flow path 20a of the flexible pipe 20. The recess 11b is formed in a shape in which the outer surface of the flexible pipe 20 is in close contact with the flow path 20a of the flexible pipe 20 closed and the fluid flow blocked.

  Moreover, the flange accommodating part 11e of the flexible pipe 20 is formed in the both sides of the pipe accommodating part 11a, and the pipe joint attachment hole 11p is formed in two places around this flange accommodating part 11e. An operation member accommodation portion 11c is formed in a groove shape at a position orthogonal to the pipe accommodation portion 11a, and the first operation member 31 is accommodated in the operation member accommodation portion 11c.

  A pin hole 11d is formed at a symmetrical position in the operating member accommodating portion 11c. Furthermore, an assembly positioning pin hole 11o is formed on the joining side of the first body 11. On both sides of the first body 11, lid attachment holes 11 s that cover the operation member housing portion 11 c are formed.

  A cylindrical drive hole 11f is formed in the first body 11 from the non-joining side to the central portion, and a seal groove 11g is formed on the opening side of the drive hole 11f. In the drive hole 11f, a communication hole 11h is formed at the center of the bottom of the hole. Fluid passages 11i and 11j are formed at both ends of the drive hole 11f, the fluid communication passage 11k is communicated with the fluid passage 11i, the fluid communication passage 11l is communicated with the fluid passage 11j, and the fluid passages 11i and 11j. Is located in the center, and the fluid communication path 11k and the fluid communication path 11l are arranged at opposite positions across the center.

  A cover mounting screw hole 11m is formed around the drive hole 11f in the first body 11, and mounting bolt through holes 11n are formed through the corners of the first body 11, respectively.

  The flexible pipe 20 is not particularly limited as long as it is a flexible material such as resin and rubber, and is arbitrarily selected according to the flowing fluid, and is required to have durability and chemical resistance. The flexible pipe 20 has a true cylindrical shape, but may have an elliptical shape. A part of the flexible pipe 20 is bent to close the flow path 20a, and the flexible pipe 20 smoothly changes the cross-sectional area of the flow path 20a and flows through the flow path 20a. The flow rate of the valve can be adjusted or opened and closed, and the responsiveness of the valve operation is good.

  Flange portions 20a are formed at both ends of the flexible pipe 20, but at least one end portion has a mounting flange 20b. Since the flexible pipe 20 has the mounting flange 20b, a special seal member is not required for connection to the pipe 100.

  As shown in FIGS. 13 to 18, the second body 12 is formed in a square block shape like the first body 11, and a semicircular cross section for accommodating the flexible pipe 20 on the joining side. A pipe housing portion 12a having a recess is formed in the central portion of the pipe housing portion 12a, and recessed portions 12b that allow a change in the cross-sectional area of the flow path 20a of the flexible pipe 20 are formed on both sides of the pipe housing portion 12a. Is formed. Moreover, the flange accommodating part 12e of the flexible pipe 20 is formed in the both sides of the pipe accommodating part 12a.

  Moreover, the flange accommodating part 12e of the flexible pipe 20 is formed in the both sides of the pipe accommodating part 12a, and the pipe joint attachment hole 12p is formed in two places around this flange accommodating part 12e.

  An operation member accommodation portion 12c is formed in a groove shape at a position orthogonal to the pipe accommodation portion 12a, and the second operation member 32 is accommodated in the operation member accommodation portion 12c. A pin hole 12d is formed at a symmetrical position in the operating member accommodating portion 12c. Further, an assembly positioning pin hole 12o is formed on the joining side of the second body 12. On both sides of the second body 12, lid attachment holes 12s that cover the operating member housing portion 12c are formed.

  A cylindrical drive hole 12f is formed in the second body 12 from the non-joint surface side to the center portion, and a seal groove 12g is formed on the opening side of the drive hole 12f. In the drive hole 12f, a communication hole 12h is formed in the center of the hole bottom. Fluid passages 12i and 12j are formed at both ends of the drive hole 12f, the fluid communication passage 12k communicates with the fluid passage 12i, the fluid communication passage 12l communicates with the fluid passage 12j, and the fluid passages 12i and 12j. Is located at the center, and the fluid communication path 12k and the fluid communication path 12l are arranged at positions opposite to each other across the center. On the joint surface side of the second body 12, a passage sealing material 12r is provided so as to surround each connection portion of the fluid communication passage 12k and the fluid communication passage 121.

  The second body 12 is formed with a cover mounting screw hole 12m around the drive hole 12f, and further, a mounting bolt mounting screw hole 12n is formed at each corner of the second body 12.

  Next, the first drive mechanism 34 and the first operation member 31 provided in the first body 11 will be described.

  As shown in FIGS. 1 to 6, the first body 11 incorporates a first drive mechanism 34 in the drive hole 11 f of the first body 11, and the first drive mechanism 34 has a first operation member. 31 is assembled, the O-ring 40 is fitted into the seal groove 11g of the first body 11, the drive hole 11f is covered with the cover 41, and the bolt 42 is screwed and attached to the cover mounting screw hole 11m. A damper 43 is fixed to the inside of the cover 41 with a screw 44 so as to reduce noise caused by a collision when the first drive mechanism 34 is operated.

  The first drive mechanism 34 has a piston 34a movably provided in the drive hole 11f, and the piston 34a is sealed by an O-ring 34b. The piston 34a divides the interior of the drive hole 11f into a passage closing chamber 34c and a passage opening chamber 34d. The fluid passage 11i communicates with the passage closing chamber 34c, the fluid passage 11j communicates with the passage opening chamber 34d, and the piston 34a moves in the closing direction by the fluid supplied to the passage closing chamber 34c. It moves in the opening direction by the fluid supplied to the 34d passage.

  The piston shaft portion 34e of the piston 34a is inserted into the communication hole 11h, and the piston shaft portion 34e is sealed with an O-ring 34f.

  The first actuating member 31 is arranged in a direction intersecting with the flexible pipe 20, in a direction orthogonal in this embodiment, and changes the cross-sectional area of the flow path of the flexible pipe 20. It is formed of a metal such as an aluminum alloy or SUS, an alloy, a reinforced resin, or the like, and formed into a square plate shape.

  The first actuating member 31 has a boss 31a formed at the center, and this boss 31a is attached to the tip of the piston shaft 34e. Guide holes 31b are formed through both ends of the first operating member 31 so as to penetrate therethrough.

  Moreover, the 1st action | operation member 31 has the bush 31c at least in the flexible pipe 20 and a contact part. The bush 31c is made of resin, rubber or the like, and is formed in various shapes as shown in FIG. 6A shows a spherical contact portion of the bush 31c, FIG. 6B shows a corrugated contact portion of the bush 31c, and FIG. 6C shows a flat contact portion of the bush 31c. Each is selected according to the flexible pipe 20.

  Next, the second drive mechanism 35 and the second operation member 32 provided in the second body 12 will be described.

  As shown in FIGS. 1 to 6, the second body 12 incorporates a second drive mechanism 35 in the drive hole 12 f of the second body 12, and the second drive mechanism 35 has a second operating member. 32, the O-ring 50 is fitted into the seal groove 12g of the second body 12, the drive hole 12f is covered with the cover 51, and the bolt 52 is screwed and attached to the cover mounting screw hole 12m. A damper 53 is fixed inside the cover 51 with a screw 54 to reduce noise generated by a collision when the second drive mechanism 35 is operated.

  The second drive mechanism 35 has a piston 35a movably provided in the drive hole 12f, and the piston 35a is sealed by an O-ring 35b. The piston 35a divides the interior of the drive hole 12f into a passage closing chamber 35c and a passage opening chamber 35d. The fluid passage 12i communicates with the passage closing chamber 35c, the fluid passage 12j communicates with the passage opening chamber 35d, and the piston 35a moves in the closing direction by the fluid supplied to the passage closing chamber 35c. It moves in the opening direction by the fluid supplied to the 35d passage.

  The piston shaft portion 35e of the piston 35a is inserted into the communication hole 12h, and the piston shaft portion 35e is sealed with an O-ring 35f.

  The second actuating member 32 is arranged in a direction intersecting with the flexible pipe 20 sandwiched therebetween, in this embodiment, in an orthogonal direction, and changes the cross-sectional area of the flow path of the flexible pipe 20. It is formed of a metal such as an aluminum alloy or SUS, an alloy, a reinforced resin, or the like, and formed into a square plate shape.

  The second actuating member 32 has a boss portion 32a at the center, and this boss portion 32a is attached to the tip of the piston shaft portion 35e. Guide holes 32 b are formed through both ends of the second operating member 32.

  The second operating member 32 has a bush 32c at least in contact with the flexible pipe 20. This bush 32c is comprised with resin, rubber | gum, etc., as shown in FIG. 6, is formed in various shapes, and is selected according to the flexible pipe 20, respectively.

  Next, assembly of the first body 11 including the first driving mechanism 34 and the first operating member 31 and the second body 12 including the second driving mechanism 35 and the second operating member 32 will be described. To do.

  First, the gasket 55 is disposed on the joint surface of the second body 12, the flexible pipe 20 is accommodated in the pipe accommodating portion 12a, and the mounting flange 20b of the flexible pipe 20 is fitted into the flange accommodating portion 12e. The operating member accommodating portion 12c accommodates the second operating member 32, and passes through one end portion 90a of the guide shaft 90 into the guide hole 32b of the second operating member 32 and is inserted into the pin hole 12d. Further, one end portion 91 a of the assembly positioning pin 91 is inserted into the assembly positioning pin hole 12 o of the second body 12.

  Assembly positioning of the first body 11 on the other end portion 91b of the assembly positioning pin 91 so that the joint surface of the second body 12 is brought into contact with the joint surface of the second body 12 via the gasket 55. While inserting into the pin hole 11o, it penetrates the other end part 90b of the guide shaft 90, and inserts it into the pin hole 11d. By bringing the joint surface of the first body 11 into contact with the joint surface of the second body 12, the flexible pipe 20 is accommodated in the pipe housing portion 11a of the first body 11, and the flexible pipe is accommodated. The 20 mounting flanges 20b are fitted into the flange accommodating portion 11e.

  Then, the mounting bolts 93 are inserted into the mounting bolt through holes 11n at the corners of the first body 11, and the mounting bolts 93 are screwed into the mounting bolt mounting screw holes 12n of the second body 12 to be fastened and fixed. The lid 60 is applied to both sides of the first body 11 and both sides of the second body 12, the mounting bolt 61 is screwed into the lid mounting hole 11s of the first body 11, and the mounting bolt 62 is attached. The second body 12 is screwed into the lid attachment hole 12s and covers the outside of the operating member accommodating portions 11c and 12c.

  Further, the mounting flange 65a of the pipe joint 65 is applied to the mounting flange 20b of the flexible pipe 20 on both sides of the first body 11 and both sides of the second body 12, and the bolt 66 is applied to the first body 11. Then, the bolt 67 is screwed into the pipe joint mounting hole 12p of the second body 12 and is fastened and fixed. The pipe 100 is connected to the pipe joint 65, but the pipe 100 is made of, for example, metal, resin, rubber, or the like, and is not particularly limited.

  By bringing the joint surface of the first body 11 into contact with the joint surface of the second body 12 via the gasket 55, the fluid communication path 11k and the fluid communication path 12k are connected in a sealed state.

  The operation means 36 drives the first drive mechanism 34 and the second drive mechanism 35, and includes a pressure generator 36c and pressure supply pipes 36a and 36b. The pressure supply pipe 36a communicates the pressure generator 36c and the fluid passage 11i, and the pressure supply pipe 36b communicates the pressure generator 36c and the fluid path 11j. In this embodiment, the air pressure is generated by the pressure generator 36c, but a device that generates hydraulic pressure may be used.

  Next, the operation of this embodiment will be described.

  When closing the flexible pipe 20, if air pressure is supplied from the pressure supply pipe 36a to the fluid passage 11i, air pressure is supplied from the fluid passage 11i to the passage closing chamber 34c, and the piston 34a moves in the closing direction. At the same time, air pressure is supplied from the fluid communication passage 11k, the fluid communication passage 12k, and the fluid passage 12i to the passage closing chamber 35c, and the piston 35a moves in the closing direction. By moving the piston 34a and the piston 35a in the closing direction at the same time, the first operating member 31 and the second operating member 32 disposed on both sides of the flexible pipe 20 are moved in the proximity direction. The flow path 20a can be closed by changing the cross-sectional area of the flow path 20a of the flexible pipe 20 to be small.

  When opening the flexible pipe 20, if air pressure is supplied from the pressure supply pipe 36b to the fluid passage 11j, air pressure is supplied from the fluid passage 11j to the passage closing chamber 34d, and the piston 34a moves in the opening direction. At the same time, air pressure is supplied from the fluid communication path 11l, the fluid communication path 12l, and the fluid path 12j to the passage closing chamber 35d, and the piston 35a moves in the opening direction. By moving the piston 34a and the piston 35a simultaneously in the opening direction, the first operating member 31 and the second operating member 32 arranged on both sides of the flexible pipe 20 are moved in the separating direction. The flow path 20a can be opened by changing the cross-sectional area of the flow path 20a of the flexible pipe 20 to be large.

  Thus, the first drive mechanism 34 and the second drive mechanism 35 are driven by the operating means 36, and the first and second actuating members 31 and 32 are moved in the proximity direction or the separation direction with the flexible pipe 20 interposed therebetween. And the flow rate of the fluid flowing through the flow path 20a of the flexible pipe 20 is adjusted or opened / closed. Therefore, it is possible to prevent the fluid from staying, to prevent impurities from being caught, to operate the valve smoothly, and to improve the durability without damaging the seal member.

  In this embodiment, the first and second actuating members 31 and 32 are moved in the proximity direction or the separation direction across the flexible pipe 20 to change the cross-sectional area of the flow path 20a of the flexible pipe 20. Although it is configured to close at the axial center position of the flow path 20a, it may be closed at a position displaced from the axial position of the flow path 20a.

[Second embodiment of reference example ]
In the valve device 1 of the second embodiment, as shown in FIG. 19, the same components as those of the first embodiment of the reference example are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, a valve drive unit 30 is provided, and the valve drive unit 30 includes a first drive mechanism 34 constituted by a first solenoid 34k and a second drive mechanism 35 constituted by a second solenoid 35k. doing. Wirings 36e and 36f are connected to the exciting coil 34k1 of the first solenoid 34k and the exciting coil 35k1 of the second solenoid 35, and the energization of the exciting coil 34k1 and the exciting coil 35k1 is controlled by the control device 36g. The movable core pistons 34a and 35a are moved in the closing direction or the opening direction, and the first and second actuating members 31 and 32 are moved in the proximity direction or the separation direction with the flexible pipe 20 interposed therebetween. It is the structure which changes the cross-sectional area of 20 flow paths 20a.
[ First Embodiment]
In the valve device 1 of the first embodiment, as shown in FIGS. 20 and 21, the same components as those of the first embodiment of the reference example are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, the valve drive means 30 is provided, and the valve drive means 30 has a first drive shaft 34l and a second drive shaft 35l arranged with the flexible pipe 20 interposed therebetween. The first drive shaft 34l has a screw part 34l1 for moving the first actuating member 31 and a guide part 34l2 for guiding the movement of the second actuating member 32. The second drive shaft 35l A screw portion 35l1 for moving the second actuating member 32 and a guide portion 35l2 for guiding the movement of the first actuating member 31.

  As the gear mechanism 35m rotates the first drive shaft 34l and the second drive shaft 35l in opposite directions, the first operating member 31 and the second operating member 32 move. The gear mechanism 35m includes a center gear 35m1, a first gear 35m2, and a second gear 35m3. The first gear 35m2 is attached to the first drive shaft 34l, and the second gear 35m3 is attached to the second drive shaft 35l. The center gear 35m1 is engaged between the first gear 35m2 and the second gear 35m3. When the center gear 35m1 is rotated, the first gear 35m2 and the second gear 35m3 rotate in opposite directions.

An operation knob 36h is attached to the center gear 35m1, and this operation knob 36h constitutes an operation means 36. The operation means 36 causes the first drive shaft 34l and the second drive shaft 35l to pass through the gear mechanism 35m. Are rotated in opposite directions, and the first and second actuating members 31 and 32 are moved in the proximity direction or the separation direction with the flexible pipe 20 interposed therebetween, so that the cross-sectional area of the flow path 20a of the flexible pipe 20 is increased. It is a configuration to change.
[ Third embodiment of reference example ]
In the valve device 1 of the third embodiment of the reference example , as shown in FIGS. 22 to 25, the same components as those of the first embodiment of the reference example are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, the valve drive means 30 is provided, and the valve drive means 30 has a drive shaft 35n, a first guide shaft 35o, and a second guide shaft 35p. The drive shaft 35n is disposed on one side of the flexible pipe 20, and this drive shaft 35n moves the first screw member 35n1 for moving the first actuating member 31 and the second actuating member 32 for moving the second actuating member 32. The first screw portion 35n1 and the second screw portion 35n2 are reverse-direction screws.

  The first guide shaft 35o and the second guide shaft 35p are arranged with the flexible pipe 20 interposed therebetween to guide the movement of the first operating member 31 and the second operating member 32.

  An operation knob 36 i is attached to the end of the drive shaft 35 n, and the operation knob 36 i constitutes the operation means 36. The drive shaft 35n is rotated by the operating means 36, and the first and second actuating members 31, 32 are moved in the proximity direction or the separation direction with the flexible pipe 20 interposed therebetween, so that the flow path 20a of the flexible pipe 20 In this configuration, the cross-sectional area is changed.

  The present invention can be applied to a valve device that adjusts or opens / closes the flow rate of a fluid flowing through a flow path, avoids stagnation of liquid, operates smoothly, and improves durability.

DESCRIPTION OF SYMBOLS 1 Valve apparatus 10 Valve body 11 1st body 12 2nd body 20 Flexible pipe 30 Valve drive means 31 1st action member 32 2nd action member 34 1st drive mechanism 35 2nd drive mechanism
34l 1st drive shaft 35l 2nd drive shaft 35m gear mechanism 35n drive shaft 35o 1st guide shaft 35p 2nd guide shaft 36 Operating means

Claims (3)

A valve body connected to the piping;
A flexible pipe inserted into the valve body and having a flow path;
Valve drive means for changing the cross-sectional area of the flow path by pushing the flexible pipe,
The valve body has a recess that allows a change in the cross-sectional area of the flow path of the flexible pipe,
The valve driving means includes
First and second actuating members that are arranged in symmetrical directions across the flexible pipe and that change the cross-sectional area of the flow path of the flexible pipe;
First and second drive shafts for moving the first and second actuating members across the flexible pipe;
Gear mechanisms for rotating the first and second drive shafts in opposite directions;
Operating means for driving the gear mechanism,
The first drive shaft includes a screw portion that moves the first operating member and a guide portion that guides the movement of the second operating member,
The second drive shaft has a screw part that moves the second operating member and a guide part that guides the movement of the first operating member,
The first and second drive shafts are rotated in opposite directions by the operation means via the gear mechanism,
The first and second actuating members are moved in the proximity direction or the separation direction across the flexible pipe so as to change the cross-sectional area of the flow path of the flexible pipe,
The first actuating member is moved by a screw portion of the first drive shaft, and can be guided by a guide portion of the second drive shaft,
The second actuating member can be moved by a screw portion of the second drive shaft and guided by a guide portion of the first drive shaft,
The gear mechanism is
It consists of a center gear, a first gear, and a second gear,
The first gear is attached to the first drive shaft;
The second gear is attached to the second drive shaft;
The central gear meshes between the first gear and the second gear, and when the central gear is rotated, the first gear and the second gear rotate in opposite directions,
The first drive shaft and the second drive shaft are interlocked and rotated in opposite directions,
The operation means comprises an operation knob,
The operation knob enables the central gear to rotate;
The axis of rotation of the central gear, is positioned in the flexible pipe flow path on,
The valve device, wherein the operation knob is disposed between the first drive axis and the second drive axis.   The valve device according to claim 1, wherein the first and second actuating members have bushes at least in contact with the flexible pipe.   2. The valve device according to claim 1, wherein a part of the flexible pipe is bent to close the flow path.