JP2003056725A - Pinch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pinch valve preventing excessive fastening in fully closing a valve and retaining a constant flow rate even if there is an erroneous operation and vibration. SOLUTION: This pinch valve comprises a handle 1 having a recess part 9 formed with a stopper part in the internal circumference in its upper part and a female screw 11 in the internal circumferential surface in its lower part; a bonnet 2 provided with a recess part 14 rotationally fitted to its upper part so as to prevent vertical movement of a handle and a through-hole 17 in its lower part; a clamping body 3 fitted with a stopper ring 21 in its upper part, a male screw 22 to be screwed with the female screw of the handle in its central part, a flange part 23 vertically moving the though hole 17 in its lower part, and a clamping element 24 in its lower end; an elastic pipe 4 released by press- contacted by the clamping element; a body 5 joined with the lower end of the bonnet and having a groove 26 for receiving the pipe; and a connecting part 6 connecting the pipes in the both sides of the body to other tubes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch valve used for fluid transportation piping in various industrial fields such as chemical factories, semiconductor manufacturing, food, biotechnology, and the like.
More specifically, the present invention relates to a pinch valve having an overtightening prevention function and a handle fixing function.

[0002]

2. Description of the Related Art Conventionally, various pinch valves have been proposed, an example of which is disclosed in Japanese Utility Model Laid-Open No. 2-84071. According to this, as shown in FIG. 17, the synthetic resin tube 50 inserted into the housing 49 is radially pressed by the tube pressing member 51 to adjust the flow rate of the fluid, and the outer circumference of the pressing portion of the synthetic resin tube 50 of the pinch valve. An elastic ring 52 capable of deforming the synthetic resin tube 50 into a flat state and having a larger restoring force than the synthetic resin tube 50 was fitted on the surface.

[0003]

However, in the pinch valve having the above structure, if excessive tightening torque is applied when the valve is fully closed, the housing 49, the elastic ring 52, the synthetic resin tube 50, etc. There was a risk of damage. Even if the flow rate is adjusted once, the handle will rotate and deviate from the set flow rate value due to human erroneous operation due to a simple mistake by the operator during use, or disturbance such as vibration of the pump on the piping line. was there.

The present invention has been made in view of the problems of the prior art as described above, and it is possible to reliably prevent overtightening when the valve is fully closed, and also to prevent human error due to a simple operation error. It is possible to provide a pinch valve with excellent operability, in which the flow rate is kept constant without the handle turning even if disturbances such as vibration occur on the piping line after setting the flow rate. To aim.

[0005]

The pinch valve of the present invention will be described with reference to the drawings. A flange portion 7 is provided on an upper portion and a fitting convex portion 8 is continuously provided on the lower portion with a diameter reduced from that of the flange portion 7. , A substantially cylindrical handle 1 provided with a concave portion 9 forming a stopper portion on the upper inner periphery and a female screw portion 11 on the lower inner peripheral surface, and the fitting convex portion 8 of the handle 1 does not move vertically on the upper portion. Is provided with a concave portion 14 that is rotatably fitted and fixed, and has a circular hole 15 and a pair of cutout grooves 16 extending in the diameter direction thereof and provided orthogonally to the flow path axis in the lower portion, A substantially cylindrical bonnet 2 continuously provided with a through hole 17 reduced in diameter from the recess 14 and a fully closed positioning stopper ring 21 are detachably fixed to the upper part, and a female part of the handle 1 is centrally attached to the bonnet 2. A male screw portion 22 that is screwed into the screw portion 11 is provided, and a circular portion is provided below the male screw portion 22. A pincer body 3 in which a flange portion 23 that is vertically movably accommodated is provided in the hole 15, and an oblong pincer 24 that engages with the pair of cutout grooves 16 is provided at the lower end, and an elastic body. And a main body 5 having a groove 26 that is joined and fixed to the lower end surface 25 of the bonnet 2 and that receives the pipe body 4 on the flow axis, and both sides of the main body 5. The first feature is to include the tube body 4 and the connecting portion 6 for connecting another tube.

A second feature is that the fully closed positioning stopper ring 21 is fixed to the upper part of the clamp body 3 by fitting or screwing.

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 attached to the male screw portion 12.
The third feature is that is screwed.

Further, the connecting portion 6 has an outer diameter larger than the inner diameter of the tubular body 4 at one end and is inserted and connected to the tubular body 4, a pipe connecting portion 41 at the other end, and a flange portion 42 at the center. And a cap nut 43 having one end engaged with the collar 42 and having a female screw portion on the inner peripheral surface, and a male screw portion 33 provided on the outer periphery with a female screw portion of the cap nut 43. The fourth feature is that the connecting body receiver 29 is made to mate.

A fifth feature is that the material of the tube body 4 is EPDM, fluororubber, silicon rubber, or a composite thereof.

A sixth feature is that the tubular body 4 is made of a composite of PTFE and silicone rubber.

The tube body 4 of the pinch valve of the present invention is an EPD.
It is not particularly limited as long as it is M, fluororubber, silicon rubber, or a composite of fluororubber and silicon rubber, but a composite of fluororesin (eg PTFE) and silicon rubber is particularly preferable. It can be mentioned as a thing. Further, the connecting body 38 constituting the connecting portion 6 is not particularly limited as long as it has chemical resistance such as plastic, but fluorine resin plastic such as PTFE, PVDF, PFA is particularly preferable. As. Further, other structural members such as the handle 1 are not particularly limited as long as they have rigidity such as metal and plastic, but PVC or plastic of fluorine resin such as PVDF is particularly preferable. To 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 goes without saying that the present invention is not limited to the embodiments. FIG. 1 is a vertical sectional view showing a closed state according to a first embodiment of a pinch valve of the present invention. FIG. 2 is a vertical cross-sectional view of the pinch valve of FIG. 1 viewed from the side surface (flow path direction). FIG. 3 is a longitudinal sectional view showing the open state of FIG. FIG. 4 is a vertical cross-sectional view of the pinch valve of FIG. 3 viewed from the side surface (flow path direction). FIG. 5 is a vertical sectional view showing the intermediate opening state before the setting in FIG. FIG. 6 is a vertical cross-sectional view showing the state after the setting of FIG. FIG. 7 is a vertical cross-sectional view of the pinch valve of FIG. 6 viewed from the side surface (flow path direction). 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 coupling body receiver in FIG. FIG. 11 is a vertical cross-sectional view of the connecting body receiver in FIG. FIG. 12 is a left side view of the coupling body receiver in FIG. FIG. 13 is a vertical sectional view showing a closed state according to the second embodiment of the pinch valve of the present invention. FIG. 14 is a vertical sectional view showing the open state of FIG. FIG. 15 is a vertical sectional view of the fully closed position of FIG. 14 before readjustment (after the fully closed positioning stopper ring is lifted). 16 is a vertical cross-sectional view after readjustment of the fully closed position of FIG.

In the figure, reference numeral 1 is a PVDF substantially cylindrical handle, and a flange portion 7 is provided on an upper portion and a fitting convex portion 8 having a diameter smaller than that of the collar portion 7 is continuously provided on a lower portion. In addition, from the top to the bottom on the inner circumference, when the valve is fully closed, a fully closed positioning stopper ring (hereinafter referred to as stopper ring) 2
1 is included and a lower end surface thereof is pressed against the bottom surface to form a stopper portion, and a communicating portion 10 having a flat inner surface and having a diameter smaller than that of the recess portion 9 and a female screw portion 11 are continuously provided.

Reference numeral 2 is a PVDF substantially cylindrical bonnet having a male screw portion 12 provided on an outer peripheral surface of an upper end thereof, and a fitting convex portion 8 of the handle 1 inside the upper portion thereof is a C-shaped snap ring 1 made of PVDF.
The concave portion 14 is rotatably fitted and fixed without engaging in the vertical movement by engaging 3 with both, and the circular hole 15 is provided in the lower portion thereof and extends in the diameter direction thereof and is orthogonal to the flow axis. A through hole 17 formed of a pair of cutout grooves 16 and having a diameter smaller than that of the recess 14 is continuously provided (see FIG. 8). Reference numeral 18 denotes a female screw portion 1 provided on the inner peripheral surface.
A PVDF lock nut 9 is screwed into the male screw portion 12 on the outer peripheral surface of the upper end portion of the bonnet 2.

Reference numeral 3 denotes a PVDF pincer body, which has an annular groove 20 provided in the upper portion and has a PVDF annular ring C.
The mold stopper ring 21 is detachably fitted and fixed,
A male screw portion 22 that is screwed into the female screw portion 11 of the handle 1 is provided in the central portion. Below the male screw portion 22, there is provided a collar portion 23 which is housed in the circular hole 15 of the bonnet 2 so as to be movable up and down, and engages with the notch groove 16 of the same pair to press and contact the pipe body 4 and the pipe. An elliptical clamp 24 separated from the body 4 is provided at the lower end. The annular groove portion 20 is provided so that the lower end surface of the annular groove portion 20 is flush with the bottom surface of the recess 9 when the valve is fully closed. That is, the annular groove portion 20 is provided so that the lower end surface of the stopper ring 21 fitted into the annular groove portion 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 to be located above the upper end surface of the handle 1. When the pinch valve is fully opened, the pincer 24 is set so that its lower end face is at least flush with the lower end face of the bonnet 2. The upper end of the clamp body 3 serves to display the opening degree of the valve. When the valve is fully closed, the clamp body 3 is adjusted so that the top surface of the clamp body 3 is at the same level as the top surface of the handle 1. It is set.
That is, when the valve is completely closed, the upper end portion of the clamp body 3 is completely hidden in the handle 1 (states of FIGS. 1 and 2). Further, when the valve is opened, the upper end portion of the clamp body 3 projects from the upper end surface of the handle 1 so that the fully opened state or the intermediate opened state of the valve can be confirmed at a glance (FIGS. 3, 4,). 5 and 6 states).

The tube body 4 is made of a composite of PTFE and silicone rubber in which a fluid flows. That is, a PTFE sheet impregnated with silicon rubber is adhesively laminated to form a desired thickness. In this embodiment, the material of the tubular body is a composite of a PTFE sheet and silicone rubber, but EPDM, silicone rubber, fluororubber, or a composite of these may be used without any particular limitation.

5 is a bolt on the lower end surface 25 of the bonnet 2.
The main body is made of PVDF and is joined and fixed with a nut or the like (not shown), and a groove 26 having a rectangular cross section for receiving the tubular body 4 is provided on the flow axis. Grooves 27 for receiving the fitting portions 30 of the coupling body receiver 29 are provided deeper than the grooves 26 at both ends of the groove 26, and the coupling body receiver 29 is provided inside the groove 27.
A recessed groove 28 is provided to receive the removal preventing protrusion 31 provided at the tip of the fitting portion 30 (see FIG. 9).

Next, parts constituting the connecting portion 6 will be described. Reference numeral 29 is a PVDF coupling body receiver, and a fitting portion 30 having a rectangular cross section that fits into the grooves 27 provided at both ends of the main body 5 is formed at one end portion, and further, at the tip bottom portion of the fitting portion 30. The main body 5 is provided with a removal preventing convex portion 31 which is fitted in a concave groove 28 provided in the groove 27. On the other hand, the other end is provided with a receiving port 32 having the same cross section for receiving the hexagonal flange portion 42 of the connecting body 38, and a male screw portion 33 is provided on the outer peripheral surface thereof. On the outer peripheral surface located between the male screw portion 33 and the fitting portion 30, an annular collar portion 34 having a diameter substantially the same as the diagonal length of the fitting portion 30 is provided. The collar portion 34 comes into contact with the bonnet 2 and the main body 5 to prevent the connecting body receiver 29 from moving inside the both main bodies. A through hole 35 having a diameter substantially the same as the outer diameter of the tubular body 4 is inserted into the fitting receiving portion 29 inside the fitting receiving portion 29, and is inserted into the insertion portion 40 of the joining body 38 which is continuous to the receiving hole 32. A through hole 36 having substantially the same diameter as the outer diameter of the expanded tube body 4 is provided. Therefore, a step portion 37 is formed on the inner peripheral surface of the coupling body receiver 29 as is apparent from the figure. The tube body 4 is clamped and fixed in the coupling body receiver 29 by the step portion 37. Although the through hole 35 and the through hole 36 having a diameter larger than that of the through hole 35 are provided in the present embodiment, the through hole 35 may be provided throughout (FIG. 1).
0, 11, 12).

The connecting body 38 has a flow path 39 inside and has a PTF.
It is made of E, has an outer diameter larger than the inner diameter of the tube body 4 at one end, and is provided with an insertion portion 40 to be inserted into the inner surface of the expanded tube body 4, while the other end portion has another A pipe connection portion 41 to which the pipe body is connected is provided. A collar portion 42 having a hexagonal cross section is provided in the central portion of the outer periphery of the connecting body 38 so as to have a diameter larger than those of both end portions. The connecting body 38 receives the collar portion 42 from the connecting body receiving 29.
The cap nut 43, which is fitted into the receiving port 32 of the coupling body 42 and is engaged with the flange portion 42, is screwed into the male screw portion 33 provided on the outer periphery of the coupling body receiving 29, so that the coupling body receiving 29 does not rotate. Is fitted and fixed to. The structure of the connecting portion 6 is not limited to this embodiment, and other structures may be used.

The operation of the pinch valve of this embodiment having the above structure 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, and the female screw portion 11 of the handle 1 is rotated. The pincer main body 3 screwed to is raised without rotating. At the same time, the clamp 24 of the clamp body 3 is separated from the tube body 4, and the tube body 4 tries to restore from the flat state to the circular tube state by the elastic force of the tube body 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 clamp body 3 is moved.
The upper end surface of the brim portion 23 is brought into pressure contact with the lower end surface of the handle 1, the rise of the pincer body 3 is stopped, and the pinch valve is fully opened (states of FIGS. 3 and 4).

Next, when the handle 1 is rotated in the closing direction with the pinch valve fully open, the handle 1 is screwed into the female screw portion 11 of the handle 1 without rotating but moving vertically. The clamp body 3 is lowered without rotating. At the same time, the lower end surface of the clamp 24 of the clamp body 3 presses the tube body 4.
When the handle 1 is further rotated in the closing direction, the pincer body 3 continues to descend, the tube body 4 is flattened, and finally the inner peripheral surface of the tube body 4 is completely adhered. At this time, the stopper 21 fitted to the clamp body 3 is also lowered together with the clamp body 3, the lower end surface of the stopper 21 is pressed against the bottom surface of the recess 9 of the handle 1, and the pinch valve is fully closed. 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 recess 9 of the handle 1, the handle 1 cannot be rotated in the closing direction. The clamp body 3 cannot descend further. That is, it is possible to prevent excessive force from being applied to the main body 5 and the tubular body 4 (states of FIGS. 1 and 2).

Next, a method of adjusting the intermediate opening degree will be described with reference to FIGS. Fully closed state (Fig. 1,
2 state), when the handle 1 is rotated in the opening direction, the pinch valve shifts from the fully closed state to the open state by the same operation as described above, and the tubular body 4 enters the intermediate opening state (state of FIG. 5). ). Here, the lock nut 18 screwed onto the outer peripheral surface of the upper end of the bonnet 2 is rotated in the direction of raising the lock nut 18, that is, the direction in which the lock nut 18 approaches the handle 1, and the upper end surface of the lock nut 18 is the collar portion of the handle 1. When the lower end surface of 7 is brought into pressure contact, 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 (states of FIGS. 6 and 7). In this state, even if the operator erroneously tries to rotate the handle 1, it cannot be rotated, and an artificial erroneous operation can be prevented. Further, it is possible to prevent the handle 1 from rotating due to vibration of the pump or the like on the piping line, and it is possible to maintain a preset flow rate value.

Next, a second embodiment of the present invention will be described with reference to FIGS. 13, 14, 15 and 16. 44 is P
With VDF stopper ring, female thread 46 on inner surface
Is provided, and a pair of small recesses 47 are provided in the radial direction of the upper end surface. Reference numeral 45 is a PVDF pincer main body, which is provided with a male screw portion 48 at the upper end thereof and is fixed with a stopper ring 44 by screwing. The structure is the same as that of the first embodiment except that the stopper ring 44 is screwed and fixed to the upper end portion of the clamp body 45, and therefore the description of the other configurations and operations will be omitted. To set and fix the stopper ring 44, first, the handle 1 is rotated in the closing direction to check the fully closed state of the valve, and then the stopper ring 44 is rotated in the descending direction using a jig or the like.
This is performed by pressing the lower end surface of 4 to the bottom surface of the recess 9 of the handle 1 (state of FIG. 13). In addition, when the pinch valve is used for a long period of time, the pipe body 4 may undergo creep deformation, which may reduce the water-stopping ability of the valve and cause leakage. In that case, first, the handle 1 is rotated in the opening direction (state of FIG. 14), and the stopper ring 44
Is rotated in the ascending direction (state of FIG. 15). After that, the fully closed position of the valve is readjusted by the same method as described above (state of FIG. 16). Therefore, the water-stopping ability is restored by the additional tightening of the handle 1, and the water-stopping ability in the long-term use of the pinch valve can be maintained.

[0024]

As is apparent from the above description, in the pinch valve of the present invention, it is possible to reliably prevent overtightening when the valve is fully closed, so that the main body and the tubular body are protected and the life of the pinch valve is increased. Can be extended. In addition, since the handle can be fixed for each opening (fully open or intermediate open), it prevents operator's erroneous operation of the valve and prevents the handle from rotating due to vibration of the pump on the piping line. The flow rate value can be maintained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a closed state according to a first embodiment of a pinch valve of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG. 1 viewed from a side surface (flow path direction).

FIG. 3 is a vertical sectional view showing an open state of FIG.

FIG. 4 is a vertical cross-sectional view of FIG. 3 viewed from a side surface (flow path direction).

5 is a longitudinal sectional view showing an intermediate opening state before setting in FIG.

FIG. 6 is a vertical cross-sectional view showing a state after the setting of FIG.

FIG. 7 is a vertical cross-sectional view of FIG. 6 viewed from the side surface (flow path direction).

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 coupling body receiver in FIG.

11 is a vertical cross-sectional view of the joint body receiver in FIG.

FIG. 12 is a left side view of the coupling body receiver in FIG.

FIG. 13 is a vertical cross-sectional view showing a closed state according to a second embodiment of the pinch valve of the present invention.

FIG. 14 is a vertical cross-sectional view showing the open state of FIG.

FIG. 15 is a vertical cross-sectional view of the fully closed position of FIG. 14 before readjustment (after the fully closed positioning stopper ring is lifted).

16 is a vertical cross-sectional view after readjustment of the fully closed position of FIG.

FIG. 17 is a vertical cross-sectional view of a conventional pinch valve in a closed state.

[Explanation of symbols]

1 ... Handle 2 ... Bonnet 3 ... clamp body 4 ... Tube 5 ... Main body 6 ... Connection part 7 ... Tsubabe 8: Fitting convex part 9 ... Recess 10 ... Communication part 11 ... Female thread 12 ... Male thread 13 ... C type retaining ring 14 ... Recess 15 ... Circular hole 16 ... Notch groove 17 ... Through hole 18 ... Lock nut 19 ... Female thread 20 ... Annular groove 21 ... Stopper ring 22 ... Male screw part 23 ... Tsubabe 24 ... pincer 25 ... Bottom surface 26 ... Groove 27 ... Groove 28 ... concave groove 29 ... Receiving body 30 ... Fitting part 31 ... Detachment prevention protrusion 32 ... Receptacle 33 ... Male screw part 34 ... Tsubabe 35 ... through hole 36 ... Through hole 37 ... Step 38 ... Connected body 39 ... Channel 40 ... insertion part 41 ... Piping connection 42 ... Tsubabe 43 ... Cap nut 44 ... Fully closed positioning stopper ring 45. Clamp body 46 ... Female thread 47 ... Small recess 48 ... Male thread 49 ... Housing 50 ... tube 51 ... Tube pressing member 52 ... Elastic ring

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Claims (6)

[Claims] 1. A recessed portion (7) having a flange portion (7) at an upper portion and a fitting protrusion portion (8) continuously reduced in diameter at a lower portion than the flange portion (7), and forming a stopper portion at an inner circumference of the upper portion. 9) and a substantially cylindrical handle (1) provided with a female screw part (11) on the inner surface of the lower part, and a fitting convex part (8) of the handle (1) on the upper part without turning up and down. A recess (14) movably fitted and fixed
A circular hole (15) and a pair of cutout grooves (16) extending in the diametrical direction of the circular hole and provided at right angles to the flow axis, and having a diameter smaller than that of the recess (14). A substantially cylindrical bonnet (2) having a continuous through hole (17) provided therein and a fully closed positioning stopper ring (21) are detachably fixed to the upper part, and a handle (1) is provided at the center. Is provided with a male screw portion (22) to be screwed into the female screw portion (11), and a flange portion (23) accommodated in the circular hole (15) so as to be vertically movable is provided at the lower portion of the male screw portion (11). Oval pincer (2) that engages with the notch groove (16) of
4) a clamp body (3) provided at the lower end, a tubular body (4) made of an elastic body and pressed against and released by the clamp (24), and a lower end surface (25) of the bonnet (2). Groove (26) fixedly joined and receiving the tubular body (4) on the flow axis
(5) having a body and pipes (4) on both sides of the body (5)
And a connecting part (6) for connecting another tube. 2. The pinch valve according to claim 1, wherein a fully closed positioning stopper ring (21) is fixed to the upper part of the clamp body (3) by fitting or screwing. 3. The bonnet (2) is provided with a male screw portion (12) on an outer peripheral surface of an upper end portion thereof, and a lock nut (18) is screwed to the male screw portion (12). The pinch valve according to claim 1. 4. The connecting part (6) has an outer diameter larger than the inner diameter of the tube body (4) at one end and is inserted and connected to the tube body (4), and a pipe connection at the other end. A coupling body (38) having a portion (41) and a collar portion (42) at the center, a cap nut (43) having one end engaged with the collar portion (42) and having an internal thread portion on the inner peripheral surface, and an outer periphery. Male screw part (3
The pinch valve according to any one of claims 1 to 3, characterized in that the pinch valve (3) comprises a connecting body receiver (29) for screwing the female screw portion (3) with the female screw portion of the cap nut (43). 5. The pinch valve according to claim 1, wherein the material of the tubular body (4) is EPDM, fluororubber, silicone rubber, or a composite thereof. 6. The pinch valve according to claim 1, wherein the tubular body (4) is made of a composite of PTFE and silicone rubber.