JP3542339B2 - Pinch valve - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pinch valve used for fluid transport piping in various industrial fields such as a chemical factory, semiconductor manufacturing, food, and biotechnology, and more particularly, to a pinch valve having an overtightening prevention function and a handle fixing function. It is.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various pinch valves have been proposed, one example of which is disclosed in Japanese Utility Model Laid-Open No. 2-84071. According to this, as shown in FIG. 17, the outer periphery of the pressing portion of the synthetic resin tube 50 of the pinch valve for adjusting the flow rate of the fluid by pressing the synthetic resin tube 50 inserted through the housing 49 in the radial direction by the tube pressing member 51. An elastic ring 52 capable of deforming the synthetic resin tube 50 into a flat state and having a greater restoring force than the synthetic resin tube 50 was fitted to the surface.
[0003]
[Problems to be solved by the invention]
However, in the pinch valve having the above structure, when an excessive tightening torque is applied when the valve is fully closed, the housing 49, the elastic ring 52, the synthetic resin tube 50, and the like may be damaged. In addition, even if the flow rate is adjusted once, the handle will rotate and deviate from the set flow rate value due to human error due to a simple mistake of the operator during use or disturbance such as vibration of the pump etc. on the piping line. was there.
[0004]
The present invention has been made in view of the above-described problems of the related art, and can surely prevent overtightening when the valve is fully closed, and also cause an erroneous operation due to a simple operation error of an operator. It is an object of the present invention to provide a pinch valve excellent in operability, in which not only can the handle be prevented from rotating but also the handle does not rotate even if disturbance such as vibration occurs on the piping line after setting the flow rate. .
[0005]
[Means for Solving the Problems]
The pinch valve according to the present invention will be described with reference to the drawings. A flange 7 is provided at an upper portion, a diameter of the flange 7 is reduced at a lower portion, and a fitting convex portion 8 is provided continuously, and a stopper portion is formed at an upper inner periphery. A substantially cylindrical handle 1 provided with a concave portion 9 and a female screw portion 11 on a lower inner peripheral surface, and a fitting convex portion 8 of the handle 1 is rotatably fitted and fixed to the upper portion without moving up and down. The lower part is provided with a circular hole 15 and a pair of cutout grooves 16 extending in the diameter direction thereof and provided orthogonal to the flow axis, and is provided with a diameter reduced from the concave part 14. A substantially cylindrical bonnet 2 provided with a continuous through-hole 17 and a fully-closed positioning stopper ring 21 are removably fixed at the upper part, and a male screwed into the female screw part 11 of the handle 1 at the center. A screw portion 22 is provided, and the lower portion thereof is vertically movably housed in the circular hole 15. The pressurizer body 3, which is provided with a flange portion 23, which is provided at the lower end thereof and has an oval pressurizer 24 which engages with the pair of notches 16, is pressed against and released from the pressurizer 24 by an elastic body. The main body 5 having a groove 26 that is fixedly joined to the lower end face 25 of the bonnet 2 and receives the main body 4 on the flow path axis, and the main body 5 on both sides of the main body 5 and other tubes are connected. The first feature is to have the connection section 6.
[0006]
A second feature is that a fully closed positioning stopper ring 21 is fixed to the upper portion of the nipping body 3 by fitting or screwing.
[0007]
A third feature is that a male screw portion 12 is provided on the outer peripheral surface of the upper end portion of the bonnet 2 and a lock nut 18 is screwed to the male screw portion 12.
[0008]
The connecting portion 6 has an insertion portion 40 formed at one end and having an outer diameter larger than the inner diameter of the tube 4 and inserted and connected to the tube 4, a pipe connection portion 41 at the other end, and a flange 42 at the center. A coupling body 38, a cap nut 43 having one end engaged with the flange 42 and having a female thread on the inner peripheral surface, and a coupling for threading the male thread 33 provided on the outer periphery with the female thread of the cap nut 43. The fourth feature is that it comprises the body receiver 29.
[0009]
A fifth feature is that the material of the tube body 4 is EPDM, fluoro rubber, silicon rubber, or a composite thereof.
[0010]
A sixth feature is that the tube 4 is made of a composite of PTFE and silicone rubber.
[0011]
The pinch valve tube 4 of the present invention is not particularly limited as long as it is EPDM, fluoro rubber, silicon rubber, or a composite of fluoro rubber and silicon rubber, but is not particularly limited, but is a fluororesin (for example, PTFE or the like). A composite of styrene and silicone rubber is particularly preferred.
The connecting body 38 constituting the connecting portion 6 is not particularly limited as long as it has chemical resistance such as plastic, but plastics of fluororesin such as PTFE, PVDF, PFA are particularly preferable. As
Other components such as the handle 1 are not particularly limited as long as they are rigid materials such as metal and plastic. Plastics such as PVC and fluororesin such as PVDF are particularly preferable. Can be
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but it is needless to say that the present invention is not limited to the embodiments.
FIG. 1 is a longitudinal sectional view showing a closed state according to a first embodiment of the pinch valve of the present invention. FIG. 2 is a longitudinal sectional view of the pinch valve of FIG. 1 as viewed from the side (in the direction of the flow path). FIG. 3 is a longitudinal sectional view showing the open state of FIG. FIG. 4 is a longitudinal sectional view of the pinch valve of FIG. FIG. 5 is a longitudinal sectional view showing the intermediate opening state before setting in FIG. FIG. 6 is a longitudinal sectional view showing the state after the setting of FIG. FIG. 7 is a longitudinal sectional view of the pinch valve of FIG. FIG. 8 is a bottom view of the bonnet in FIG. FIG. 9 is a plan view of the main body in FIG. FIG. 10 is a right side view of the connector receiver in FIG. FIG. 11 is a longitudinal sectional view of the coupled body receiver in FIG. FIG. 12 is a left side view of the connector receiver in FIG. FIG. 13 is a longitudinal sectional view showing a closed state according to a second embodiment of the pinch valve of the present invention. FIG. 14 is a longitudinal sectional view showing the open state of FIG. FIG. 15 is a longitudinal sectional view of the fully closed position in FIG. 14 before readjustment (after the fully closed positioning stopper ring is raised). FIG. 16 is a longitudinal sectional view after readjustment of the fully closed position of FIG.
[0013]
In the figure, reference numeral 1 denotes a substantially cylindrical handle made of PVDF, in which a flange 7 is provided at an upper portion and a fitting projection 8 is continuously provided at a lower portion with a diameter smaller than that of the flange 7. When the valve is fully closed, a stopper ring 21 (hereinafter, referred to as a stopper ring) 21 is included in the inner periphery from the upper portion to the lower portion, and the lower end surface thereof is pressed against the bottom surface to form a concave portion 9 forming a stopper portion. The communication part 10 and the female screw part 11 which are flat and have a diameter reduced from the concave part 9 are provided continuously.
[0014]
Reference numeral 2 denotes a substantially cylindrical hood made of PVDF, which is provided with a male screw portion 12 on the outer peripheral surface of the upper end portion, and a fitting projection 8 of the handle 1 inside the upper portion engages a C-type snap ring 13 made of PVDF with both. The recess 14 is fitted and fixed so as to be rotatable without moving up and down, and a circular hole 15 and a pair of cutouts extending in the diametrical direction and provided perpendicular to the axis of the flow path at the lower part thereof. A through hole 17 composed of the groove 16 and provided with a smaller diameter than the concave portion 14 is provided continuously (see FIG. 8).
Reference numeral 18 denotes a lock nut made of PVDF in which a female screw portion 19 provided on the inner peripheral surface is screwed to the male screw portion 12 on the outer peripheral surface of the upper end of the bonnet 2.
[0015]
Reference numeral 3 denotes a PVDF-made indenter main body. A C-shaped stopper ring 21 having an annular shape made of PVDF is removably fitted and fixed to an annular groove portion 20 provided at an upper portion thereof. An external thread portion 22 to be screwed to the portion 11 is provided. A flange portion 23 is provided below the male screw portion 22 so as to be vertically movable in the circular hole 15 of the bonnet 2, and engages with the same pair of notches 16 to press the tube 4 against the tube 4. An oval pressurizer 24 spaced from the body 4 is provided at the lower end. The annular groove portion 20 is provided such that the lower end surface of the annular groove portion 20 is flush with the bottom surface of the concave portion 9 when the valve is fully closed. That is, the annular groove 20 is provided such that the lower end surface of the stopper ring 21 fitted into the annular groove 20 is pressed against the bottom surface of the recess 9 when the valve is fully closed. On the other hand, when the valve is fully opened, the lower end surface of the annular groove portion 20 is set above the upper end surface of the handle 1. When the pinch valve is fully opened, the pinch valve 24 is set so that its lower end surface is at least flush with the lower end surface of the bonnet 2. The upper end of the clamp body 3 serves to display the opening of the valve. When the valve is fully closed, the clamp body 3 is positioned such that the upper end surface of the clamp body 3 is at the same level as the upper end surface of the handle 1. Is set. That is, when the valve is completely closed, the upper end of the nipping body 3 is completely hidden in the handle 1 (the state shown in FIGS. 1 and 2). When the valve is opened, the upper end of the presser body 3 protrudes from the upper end surface of the handle 1 so that the state of full opening or intermediate opening of the valve can be checked at a glance (FIGS. 3, 4). 5,6).
[0016]
The tube 4 is made of a composite of PTFE and silicone rubber through which a fluid flows. That is, the PTFE sheet impregnated with silicon rubber is formed by bonding and laminating several layers to a desired thickness. In this embodiment, the material of the tube is a composite of a PTFE sheet and silicone rubber, but may be EPDM, silicone rubber, fluorine rubber, or a composite of these, and is not particularly limited.
[0017]
Reference numeral 5 denotes a main body made of PVDF which is joined and fixed to the lower end surface 25 of the bonnet 2 with bolts, nuts or the like (not shown). A groove 26 having a rectangular cross section for receiving the pipe 4 is provided on the flow axis. ing. At both ends of the groove 26, a groove 27 for receiving the fitting portion 30 of the connector receiver 29 is provided deeper than the groove 26. Further, inside the groove 27, a tip of the fitting portion 30 of the connector receiver 29 is provided. A concave groove 28 is provided for receiving the protrusion 31 for removal prevention (see FIG. 9).
[0018]
Next, the components forming the connecting portion 6 will be described.
Reference numeral 29 denotes a coupling member receiver made of PVDF, which is formed at one end with a fitting portion 30 having a rectangular cross section to be fitted into the grooves 27 provided at both ends of the main body 5, and at the bottom of the distal end of the fitting portion 30. Is provided with a protrusion 31 for preventing slip-off, which is fitted into a concave groove 28 provided in the groove 27 of the main body 5. On the other hand, a receiving port 32 having the same cross section for receiving the hexagonal flange 42 of the connecting body 38 is provided at the other end, and a male screw 33 is provided on the outer peripheral surface thereof. An annular flange portion 34 having a diameter substantially equal to the diagonal length of the fitting portion 30 is provided on the outer peripheral surface located between the male screw portion 33 and the fitting portion 30. The flange 34 contacts the bonnet 2 and the main body 5 to prevent the connecting body receiver 29 from moving into the inside of both main bodies. Inside the coupling body receiver 29, a through-hole 35 having substantially the same diameter as the outer diameter of the tube 4 is inserted into the insertion portion 40 of the coupling body 38, which continuously communicates with the receiving port 32. A through hole 36 having substantially the same diameter as the outer diameter of the expanded tube 4 is provided. Therefore, a step 37 is formed on the inner peripheral surface of the coupling body receiver 29 as is apparent from the figure. The tube 4 is clamped and fixed in the connector receiver 29 by the step 37. In this embodiment, the through hole 35 and the through hole 36 having a diameter larger than the through hole 35 are provided. However, the through hole 35 may be provided as a whole (see FIGS. 10, 11, and 12).
[0019]
The connecting body 38 has a flow path 39 inside and is made of PTFE, and has an outer diameter formed at one end thereof larger than the inner diameter of the tubular body 4, and is inserted into the inner surface of the enlarged tubular body 4. 40 is provided, and a pipe connection part 41 to which another pipe is connected is provided at the other end. A flange 42 having a hexagonal cross section is provided at the center of the outer periphery of the connecting body 38 so as to have a diameter larger than that of both ends. The connecting body 38 has the flange 42 fitted into the receiving port 32 of the connecting body receiver 29, and the cap nut 43 engaged with the flange 42 is screwed into the male screw part 33 provided on the outer periphery of the connecting body receiver 29. By doing so, it is fitted and fixed to the connector receiver 29 so as not to rotate. Note that the structure of the connection portion 6 is not limited to this embodiment, and another structure may be used.
[0020]
The operation of the pinch valve according to this embodiment having the above-described configuration is as follows.
As shown in FIGS. 1 and 2, when the handle 1 is rotated in the opening direction with the pinch valve fully closed, the handle 1 rotates but does not move up and down. Is raised without rotating it. At the same time, the clamp 24 of the clamp body 3 is separated from the tube 4, and the tube 4 tries to restore from the flat state to the circular state by the elastic force of the tube itself. That is, the pinch valve shifts from the fully closed state to the open state. When the handle 1 is further rotated in the opening direction, the clamp body 3 continues to rise, and finally, the upper end surface of the flange portion 23 of the clamp body 3 is pressed against the lower end surface of the handle 1 to raise the clamp body 3. Stops, and the pinch valve is fully opened (the state shown in FIGS. 3 and 4).
[0021]
Next, when the handle 1 is rotated in the closing direction with the pinch valve fully opened, the handle 1 rotates but does not move up and down, and is held by the pinch body screwed into the female thread portion 11 of the handle 1. 3 is lowered without rotating. At the same time, the lower end surface of the presser 24 of the presser body 3 presses the tube 4. When the handle 1 is further rotated in the closing direction, the presser body 3 continues to descend, the tube 4 is flattened, and finally the inner peripheral surface of the tube 4 is completely adhered. At this time, the stopper 21 fitted to the clamp body 3 also descends together with the clamp body 3, the lower end surface of the stopper 21 is pressed against the bottom surface of the concave portion 9 of the handle 1, and the pinch valve is fully closed. It becomes. Even if the handle 1 is further rotated in this state, since the lower end surface of the stopper ring 21 is pressed against the bottom surface of the concave portion 9 of the handle 1, the handle 1 cannot be rotated in the closing direction. The clamp body 3 cannot be lowered any further. That is, it is possible to prevent an excessive force from being applied to the main body 5 and the tube 4 (the state shown in FIGS. 1 and 2).
[0022]
Next, a method of adjusting the intermediate opening will be described with reference to FIGS.
When the handle 1 is rotated in the opening direction in the fully closed state (the state of FIGS. 1 and 2), the pinch valve shifts from the fully closed state to the open state by the same operation as described above, and the pipe 4 is in the intermediate opening state. (The state shown in FIG. 5). Here, the lock nut 18 screwed to the outer peripheral surface of the upper end portion of the bonnet 2 is rotated in a direction in which the lock nut 18 is lifted, that is, in a direction in which the lock nut 18 approaches the handle 1. When the handle 1 is brought into pressure contact with the lower end surface of the handle 7, the handle 1 is fixed and the intermediate opening position is fixed. That is, the handle 1 cannot rotate at the fixed intermediate opening position (the state of FIGS. 6 and 7). In this state, even if the operator tries to turn the handle 1 by mistake, the handle cannot be turned, and a human erroneous operation can be prevented. In addition, rotation of the handle 1 due to vibration of a pump or the like on the piping line can be prevented, and a preset flow rate value can be maintained.
[0023]
Next, a second embodiment of the present invention will be described with reference to FIGS. Reference numeral 44 denotes a stopper ring made of PVDF, which is provided with a female screw portion 46 on the inner peripheral surface and a pair of small concave portions 47 in a radial direction on the upper end surface. Numeral 45 denotes a PVDF-made indenter main body, which is provided with a male screw portion 48 at an upper end portion, and a stopper ring 44 is fixed by screwing. Except that the stopper ring 44 is screwed and fixed to the upper end portion of the presser body 45, the configuration is the same as that of the first embodiment, and the description of the other configuration and operation is omitted.
The method of setting and fixing the stopper ring 44 is as follows. First, the handle 1 is turned in the closing direction to check the fully closed state of the valve, and then the stopper ring 44 is turned in the lowering direction using a jig or the like so that the stopper ring 44 This is performed by pressing the lower end face against the bottom surface of the concave portion 9 of the handle 1 (the state of FIG. 13).
In addition, when the pinch valve is used for a long period of time, creep deformation may occur in the pipe body 4, so that the water stopping performance of the valve may be reduced and leakage may occur. In this case, first, the handle 1 is turned in the opening direction (the state shown in FIG. 14), and the stopper ring 44 is turned in the upward direction (the state shown in FIG. 15). Thereafter, the fully closed position of the valve is readjusted by the same method as described above (the state of FIG. 16). Therefore, the water stopping performance is restored by retightening the handle 1, and the water stopping performance in long-term use of the pinch valve can be maintained.
[0024]
【The invention's effect】
As is apparent from the above description, in the pinch valve of the present invention, since overtightening can be reliably prevented when the valve is fully closed, the main body and the tube are protected and the service life of the pinch valve is drastically extended. Can be. In addition, since the handle can be fixed at each opening (full opening or intermediate opening), erroneous operation of the valve by the operator is prevented beforehand, and the setting is made without turning the handle due to vibration of the pump etc. on the piping line. The flow value can be maintained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a closed state according to a first embodiment of a pinch valve of the present invention.
FIG. 2 is a longitudinal sectional view of FIG. 1 as viewed from a side surface (flow channel direction).
FIG. 3 is a longitudinal sectional view showing an open state of FIG. 1;
FIG. 4 is a longitudinal sectional view of FIG. 3 viewed from a side surface (a flow channel direction).
FIG. 5 is a longitudinal sectional view showing an intermediate opening state before setting in FIG. 1;
FIG. 6 is a longitudinal sectional view showing a state after the setting of FIG. 5;
FIG. 7 is a longitudinal sectional view of FIG. 6 as viewed from a side surface (flow channel direction).
FIG. 8 is a bottom view of the hood in FIG. 1;
FIG. 9 is a plan view of the main body in FIG. 1;
FIG. 10 is a right side view of the connector receiver in FIG. 1;
FIG. 11 is a longitudinal sectional view of the connector receiver in FIG. 1;
FIG. 12 is a left side view of the connector receiver in FIG. 1;
FIG. 13 is a longitudinal sectional view showing a closed state according to a second embodiment of the pinch valve of the present invention.
14 is a longitudinal sectional view showing the open state of FIG.
FIG. 15 is a longitudinal sectional view before readjustment of the fully closed position in FIG. 14 (after rising of the fully closed positioning stopper ring).
FIG. 16 is a longitudinal sectional view after readjustment of the fully closed position in FIG. 13;
FIG. 17 is a longitudinal sectional view of a conventional pinch valve in a closed state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Handle 2 ... Bonnet 3 ... Indenter main body 4 ... Tube body 5 ... Main body 6 ... Connection part 7 ... Flange part 8 ... Fitting convex part 9 ... Concave part 10 ... Communication part 11 ... Female screw part 12 ... Male screw part 13 ... C-shaped retaining ring 14... Recess 15... Circular hole 16... Cutout groove 17. Indenter 25 ... Lower end surface 26 ... Groove 27 ... Groove 28 ... Concave groove 29 ... Connector receiver 30 ... Mating part 31 ... Protrusion preventing part 32 ... Receptacle 33 ... Male thread part 34 ... Flange part 35 ... Through hole 36 ... Through hole 37 ... Stepped part 38 ... Connected body 39 ... Flow path 40 ... Insertion part 41 ... Piping connection part 42 ... Flange part 43 ... Cap nut 44 ... Fully closed positioning stopper ring 45 ... Narrower body 46 ... Female screw part 47 ... Small recess 48 ... Male thread 49 ... Housing 50 ... Tube 51 ... Cube pressing member 52 ... elastic ring

Claims (6)

A flange (7) is provided at the upper part, the diameter of which is smaller than that of the flange (7), and a fitting convex part (8) is provided continuously. A substantially cylindrical handle (1) provided with a female screw portion (11) on the peripheral surface, and a fitting projection (8) of the handle (1) are rotatably fitted on the upper portion without moving up and down. A fixed concave portion (14) is provided, and a lower portion comprises a circular hole (15) and a pair of notched grooves (16) extending in the diameter direction thereof and provided orthogonal to the flow path axis. (14) A substantially cylindrical bonnet (2) provided with a continuous through hole (17) provided with a diameter smaller than that of the bonnet (2) and a fully closed positioning stopper ring (21) fixed on the upper part so as to be detachable, A male screw part (22) screwed into the female screw part (11) of the handle (1) is provided at the center part, and a circular hole is formed below the male screw part. 15) A presser provided with a flange portion (23) which is housed in a vertically movable manner and an oval presser (24) provided at the lower end for engaging with a pair of cutout grooves (16). A main body (3), a tubular body (4) made of an elastic body and pressed against and released by a sandwicher (24), and a tubular body joined and fixed to a lower end surface (25) of a bonnet (2) on the flow axis. A body (5) having a groove (26) for receiving (4), and a connecting portion (6) for connecting a tube (4) on both sides of the body (5) to another tube. Pinch valve. The pinch valve according to claim 1, wherein a fully closed positioning stopper ring (21) is fixed to an upper portion of the clamper body (3) by fitting or screwing. The male screw part (12) is provided on the outer peripheral surface of the upper end part of the bonnet (2), and the lock nut (18) is screwed into the male screw part (12). 2. The pinch valve according to claim 1. The connection part (6) has an insertion part (40) formed at one end with an outer diameter larger than the inner diameter of the pipe (4) and inserted and connected to the pipe (4), and a pipe connection part (41) at the other end. A coupling body (38) having a flange (42) at the center, a cap nut (43) having one end engaged with the flange (42) and having a female thread on the inner peripheral surface, and a male provided on the outer periphery The pinch valve according to any one of claims 1 to 3, comprising a coupling body receiver (29) for screwing the screw portion (33) into a female screw portion of the cap nut (43). The pinch valve according to any one of claims 1 to 4, wherein the material of the tube (4) is EPDM, fluoro rubber, silicon rubber, or a composite thereof. The pinch valve according to any one of claims 1 to 4, wherein the tube (4) is made of a composite of PTFE and silicone rubber.

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