JP2011220501A - Pinch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pinch valve reduced in weight with a simple structure, capable of closing a pipe under low pressure.SOLUTION: The problem is solved by the pinch valve 1 composed of a means including two flexible thin films 4 arranged in a valve case 2 forming the pipe by opposing the inner peripheral wall surface side of two valve case half bodies 3 so as to cover the respective inner peripheral wall surface and end part whole periphery of the two valve case half bodies 3, having a straight line-shaped end part along the pipe direction sandwiched together with a flange part of the two valve case half bodies, having a circular arc-shaped end part in the right-angled direction to the pipe direction bent by an end part of the valve case half bodies 3 and sandwiched by the valve case half bodies 3 or the like, and preventing slipping-out of the end part of the whole periphery.

Description

  The present invention relates to a pinch valve that opens and closes a conduit through which powder or liquid flows. More specifically, the present invention relates to a pinch valve that opens and closes a conduit through which a fluid such as powder or liquid flows by a flexible thin film.

  Operates a pinch valve that is composed of a stretchable tube and a valve body that hermetically surrounds the tube, and is opened and closed by allowing compressed air to enter and exit the pilot section between the tube and the valve body. A vacuum source and a compressed air source are connected in parallel to the pilot section via a direction switching valve, and when the pinch valve is opened by switching the direction switching valve, the pilot section is used as a vacuum source. In addition, a technique relating to an actuator for a pinch valve that connects the pilot unit to a compressed air source when the pinch valve is closed is disclosed (for example, see Patent Document 1).

  In addition, in a pinch valve that has a tubular body and closes the pipeline by pressing the tubular body, the sectional shape of the pipeline of the opening when the tubular body cut by a plane perpendicular to the pipeline direction is not pressed Has disclosed a technique of a pinch valve having a substantially spindle shape (see, for example, Patent Document 2).

JP 2005-133857 A JP 2005-207470 A

  However, the pinch valve described in Patent Document 1 compresses the tube 11 by compressing the compressed air and compresses the tube 11 as shown in FIG. 7, but the tube 11 has a circular cross section. When the 11 is pressed, the inner wall surface of the circular central portion is in close contact, but a gap 12 as shown in FIG. For this reason, even if the tube 11 is pressed with compressed air, there is a problem in that the openings, which are the gaps 12, remain at both ends and the fluid is leaked without being completely closed.

  In addition, both ends of the pressed tube 11 have a problem in durability because the tube 11 is cracked by the repeated compression and the tube 11 is damaged.

  Since the compression of compressed air or the suction and decompression of air is repeatedly performed on the tube 11 forming the pipe 10, there is a method of fixing the tube 11 to the valve body so that the tube 11 does not peel from the valve body. Although important, this fixing method is not described at all, and there is a problem that durability by use is remarkably inferior.

  Further, when the pipe line 10 is opened, the outer peripheral wall portion of the tube 11 is expanded and curved by making a vacuum state, so that the inner diameter of the tube is made larger than the inner diameter of the pipe line 10. In some cases, there is a problem that the powder stays in the curved portion of the tube 11.

  In the pinch valve described in Patent Document 2, since a pinch valve having a substantially spindle-shaped cross section is installed between pipes having a circular cross section, when the fluid is powder, the powder stays in the pinch valve portion. There was a problem that it was easy to do.

  The pipe is closed by pressing a pinch valve having a substantially spindle-shaped cross section with a spring biasing force, and the pipe is opened by the restoring force of the cylinder having a substantially spindle-shaped cross section having thrust and flexibility. Therefore, the tube having a substantially spindle-shaped cross section becomes thick, and therefore, a spring biasing force that can press the restoring force of the pipe line is required, and the cylinder also has a stronger thrust than the spring biasing force. Set to have. As a result, there is a problem that the air pressure becomes high, air equipment for high pressure is used, the structure of the pinch valve becomes complicated, and the manufacturing cost increases.

  Further, when the tube having a substantially spindle-shaped cross section having flexibility progresses, there is a problem that the restoring force of the substantially spindle-shaped tube is lowered and the tube is not opened to the original state.

  There are cases where shutters are used as other means for opening and closing pipelines. However, when using shutters, there is a problem that powder leaks when powder is used, and a structure that requires a shutter drive source. There was a problem that became complicated and heavy.

  Therefore, an object of the present invention is to close the pipeline in a short time at a low pressure when the pipeline is closed, and to always open the pipeline with a constant opening in a short time when the pipeline is opened. An object of the present invention is to provide a pinch valve that has a structure in which powder does not stay and the end face of a member that repeatedly opens and closes when a pipe is opened and closed, and is light in weight with a simple structure.

  In order to solve the problem described in “Problems to be Solved by the Invention”, the invention of the pinch valve 1 according to claim 1 is a pinch valve 1 that opens and closes a conduit 10 through which a fluid such as powder or liquid flows. 2, two semi-cylindrical valve case halves 3 having flange portions 21 bent in an L shape along the direction of the pipe line 10 at both ends, the inner peripheral wall surfaces of the two valve case halves 3 being The valve case 2 that is oppositely formed to form the pipe line 10 and the inner circumference wall surface and the entire end part of each of the two valve case halves 3 are arranged so as to cover the entire circumference of the pipe 10, and are linear along the direction of the pipe line 10. Of the two valve case halves 3 are clamped together with the flanges 21 of the two valve case halves 3, and the arcuate end perpendicular to the direction of the duct 10 is bent at the end of the valve case halves 3. Clamped by case half 3 etc. A thin film 4 having two flexible end of the entire circumference is retained, characterized in that it comprises means including.

  The pinch valve 1 according to the second aspect of the present invention is a pinch valve 1 that opens and closes a conduit 10 through which a fluid such as powder or liquid flows. Two annular flange bodies 5 disposed at both ends of the pinch valve 1. And between the two ring-shaped flange bodies 5, two U-shaped arc-shaped flange bodies 7 are provided at both ends, and two ends of each arc between the arc-shaped flange bodies 7 are provided. A hole 6 formed by a frame body 6 having a structure having a rod-like support body 8 and two annular flange bodies 7 in contact with one annular flange body 5 so that the two arcuate flange bodies 7 face each other. The frame body 6 into which the pipe line 10 is inserted and the flange part 21 which is disposed inside the two opposed frame bodies 6 and is bent in an L shape along the pipe line 10 direction at both ends. The two half-cylindrical valve case halves 3, The valve case 2 that forms the pipe line 10 by facing the inner peripheral wall surface side of the lube case half 3 and the inner peripheral wall surface and the entire circumference of the end of each of the two valve case halves 3 are disposed. The straight end portions along the direction of the pipe line 10 are clamped by being fastened by the flange portions 21 of the two valve case halves 3 and the rod-like support body 8, and are arcuate in a direction perpendicular to the pipe line 10 direction. Is bent at the end of the valve case half 3 and is sandwiched between the ring-shaped flange body 5, the arc-shaped flange body 7 and the valve case half 3, and the end of the entire circumference is prevented from coming off. And the two thin films 4 having flexibility.

  The invention of the pinch valve 1 according to claim 3 is the invention according to claim 1 or 2, wherein the joint 9 for compressing fluid compression and suction for compressing fluid is disposed on the outer peripheral surface of the two valve case halves 3, respectively. The two joints 9 and the two thin films 4 correspond to each other, and the corresponding thin films 4 are formed by the compressed fluid that is press-fitted through the joints 9, and the valve case 2 is formed in the direction perpendicular to the pipe line 10 direction. Over the length of the diameter of the pipe 10, the direction of the pipe 10 is in close contact with the flat plate shape over the length of 50 to 95% of the length between the annular flange bodies 5, thereby closing the pipes. By sucking the compressed fluid from 9, the corresponding thin films 4 are brought into close contact with the inner peripheral wall surface of the valve case half 3 to open the conduit 10.

  The invention according to claim 1 uses a sheet-like thin film 4 instead of the tubular tube 11 as a valve for opening and closing the conduit 10, and when the conduit 10 is closed, the two sheet-like thin films 4 are connected to the conduit. Since the tube 10 is closed in close contact with a flat plate with a width of 10 diameters, in the case of the tube 11, when compressed as shown in FIG. In the present invention of the two sheet-like thin films 4, as shown in FIG. 5, there is an effect that the opening 10 is not left at both ends and the conduit 10 can be completely closed.

  In addition, two sheets of the sheet-like thin film 4 are respectively placed on the inner peripheral wall surface side of the valve case half 3 to be in a tension state, and all the end portions of the thin film 4 are sandwiched and fixed. Even when no external force is applied to the thin film 4, the thin film 4 has a property of changing in the direction of closing the pipeline, and since it is a flexible thin film, the compressed fluid pressure when the pipeline is closed is For example, if the compressed air pressure is about 0.02 MPa, the compressed fluid pressure can be greatly reduced.

  Since the pressure at which the two thin films 4 are brought into close contact with each other can be set at a low pressure, high pressure resistance and high strength with respect to the pinch valve 1 itself are not required. For example, when compared with the pinch valve 1 having a large diameter of about 8 cm in the inner diameter of the pipe line 10, the pinch valve 1 using the conventional tube 11 requires a compressed air pressure of about 0.7 MPa. The pressure resistance and strength of the valve 1 itself must be increased. If the material is cast or stainless steel, the total weight is about 30 to 40 kg. On the other hand, in the case of the present invention, since the material of the pipe line 10 can be a polymer compound, the total weight is about 1 kg. Therefore, the total weight of the pinch valve 1 using the tube 11 can be reduced to about 1/30 to 1/40.

  Since the thin film 4 that fluctuates with a minute pressure is used, the conduit 10 can be opened and closed without using an actuator such as a cylinder or a spring, and the structure of the pinch valve 1 is simple.

  Since the thin film 4 is high, the followability is high, and when pressurized with a compressed fluid, the two thin films 4 are in close contact with each other and completely close the pipe 10 so as not to leak. There is an effect that the measurement effect is enhanced such that there is almost no time difference from the closed time and high measurement accuracy is obtained.

  The valve structure used for opening and closing is not a cylindrical structure like a tube, but a structure in which two thin film 4 sheets face each other, and is brought into close contact with the inner peripheral wall surface of each valve case half 3 by suction. When the pinch valve 1 is fully opened, the pipe line 10 is opened with a completely fixed inner diameter. As a result, the flow path of the pipe line 10 is not narrowed, and there is an effect that the retention of powder as a fluid does not occur.

  The invention of claim 2 has the same effect as the invention of claim 1. Further, since the end portion of the entire circumference of the thin film 4 is clamped and fastened by other parts, there is an effect that the thin film 4 is not peeled even if the press-fitting or suction of the compressed fluid is repeated.

  Invention of Claim 3 has the same effect as Claim 1 or 2. Furthermore, since the joint 9 for inflow / outflow of the compressed fluid or the like is provided in each of the two sheet-like thin films 4, the close contact between the two thin films at the time of press-fitting the compressed fluid and the respective at the time of sucking the compressed fluid There is an effect that the adhesion of the thin film to the valve case half 3 can be completed in a short time.

It is a plane schematic diagram of the pinch valve which is one example of the present invention. It is a front schematic diagram of the AA cross section in FIG. It is a side surface schematic diagram of the pinch valve which is one example of the present invention. It is a plane schematic diagram of the pipe line open state of the BB cross section in FIG. It is a plane schematic diagram of the pipe line closed state of the BB section in FIG. FIG. 2 is a schematic front view of the AA cross section in FIG. 1 when a compressed fluid is press-fitted in one embodiment of the present invention to expand a thin film and close a pipe line. It is a tube section outline figure of a pipe line open state in case a pipe line is a tube. It is a tube section outline figure of a pipe line closed state in case a pipe line is a tube.

  This will be described with reference to FIGS. 1, 2, 3 and 4. A pinch valve 1 according to the present invention includes two ring-shaped flange bodies 5 disposed at both ends of the pinch valve 1 and a substantially U-shaped arc-shaped flange at both ends disposed between the two ring-shaped flange bodies 5. A frame body 6 having a structure having two rod-shaped support bodies 8 between end portions between the arc-shaped flange bodies 7 and two arc-shaped flange bodies in one ring-shaped flange body 5. 7 is in contact with the two arcuate flange bodies 7, and the frame body 6 is inserted into the hole formed by facing the two arcuate flange bodies 7, and the two opposed frame bodies 6 are disposed inside. Two semi-cylindrical valve case halves 3 having flange portions 21 bent in an L shape along the direction of the pipe line 10 at both ends are opposed to the inner peripheral wall surfaces of the two valve case halves 3. The valve case 2 forming the pipe line 10 and the two valve case half 3 are arranged so as to cover the inner peripheral wall surface and the entire circumference of the end portion, and the linear end portions along the direction of the pipe line 10 are the flange portion 21 of the two valve case halves 3 and the rod-like support body. 8 is clamped and fastened, and an arc-shaped end portion perpendicular to the direction of the pipe line 10 is bent at an end portion of the valve case half 3 to form the ring-shaped flange body 5, the arc-shaped flange body 7, and the Two flexible thin films 4 sandwiched between the valve case halves 3 and whose end portions on the entire circumference are prevented from coming off and the outer peripheral surfaces of the two valve case halves 3 are used for pressurizing compressed fluid respectively. And a joint 9 for sucking compressed fluid.

  The pinch valve 1 according to the present invention opens and closes the pipe line 10 in order to separate or pass the fluid transferred through the pipe line 10 by dropping or the like in the pipe line 10 using powder or liquid as a fluid.

  The two annular flange bodies 5 have a flat annular shape, and the inner diameter of the annular flange body 5 is substantially the same as the inner diameter of the pipe line 10, and the annular flange body 5 is connected to other pipe line 10 components. Bolt insertion hole 22 for fastening and bolt insertion hole 23 for fastening with other parts of pinch valve 1 are provided. The two annular flange bodies 5 are disposed at both ends of the pinch valve 1, respectively.

  The frame body 6 has a substantially U-shaped arc-shaped flange body 7 at both ends, and has two rod-shaped support bodies 8 between the arc-shaped ends between the arc-shaped flange bodies 7. The arc-shaped flange body 7 is provided with a bolt insertion hole 22 for connection with another pipe line 10 and a bolt insertion hole 23 for fastening with the ring-shaped flange body 5, etc. A bolt insertion hole 24 for fastening the frame bodies 6 is provided. Two frame bodies 6 are provided for one pinch valve 1.

  The arc-shaped flange bodies 7 formed at both ends of the frame body 6 are fastened with bolt nuts 33 with one surface of the ring-shaped flange body 5 being in contact with the entire surface of the ring-shaped flange body 5. The two frame bodies 6 are fastened together with bolts and nuts 34 in the two rod-like support bodies 8 connecting the two arc-shaped flange bodies 7. In addition, when the pinch valve 1 is disposed in the pipe line 10, the pinch valve 1 is fastened to the other components other than the pinch valve 1 by the bolts and nuts 32.

  As a result, by fastening two substantially U-shaped frame bodies 6 in the side view, a substantially E shape is obtained in the side view. A pipe line 10 can be inserted into a hole formed by facing the two arcuate flange bodies 7.

  Next, the valve case 2 will be described. The valve case 2 is formed by combining the inner circumferential wall surfaces of the two valve case halves 3 so as to face each other, and the valve case 2 can form the pipe line 10. And the material of the valve case 2 should just be a material which does not deform | transform by pressure, such as a compressed fluid, among vinyl chloride, a plastics, a thermoplastic resin, a thermosetting resin, a polymeric material. Moreover, if it is made transparent, it is possible to observe the transfer state of fluid such as powder.

  The shape of the valve case half 3 is a substantially semi-cylindrical shape, and a flange portion 21 is provided by being bent into a substantially L-shape at an end portion of the straight portion of the substantially semi-cylindrical shape. A joint 9 for compressing fluid compression and suction for compressing fluid is screwed.

  The arrangement of the valve case halves 3 in the pinch valve 1 is such that the valve case 2 is formed by facing the inner peripheral wall surfaces of the two valve case halves 3 and the inner sides of the two opposed frame bodies 6 are arranged. The upper and lower ends of the semicircular portion of the semi-cylindrical portion of the valve case half 3 are in contact with the stepped portion 40 of the annular flange body 5 and the inner peripheral surface of the arc-shaped flange body 7. Then, the flange portions 21 of the two valve case halves 3 are clamped by the rod-shaped support body 8 and fastened with bolts and nuts 34.

  Next, the thin film 4 will be described. The material of the thin film 4 may be a flexible material such as a synthetic rubber such as silicon rubber, fluorine rubber, urethane rubber, or ethylene propylene rubber.

  The thin film 4 is disposed so as to cover the inner peripheral wall surface and the entire end of each of the two valve case halves 3, and the end along the direction of the pipe line 10 is the other thin film 4. And the flange portions 21 of the two valve case halves 3 are clamped and fastened by the rod-like support 8, and the end in the direction perpendicular to the direction of the pipe 10 is an arc shape of the valve case halves 3. It is bent along the end on the side, and is sandwiched between the valve case half 3 and the annular flange body 5, and the end of the thin film 4 is extended to extend the annular flange body 5 and the arcuate flange body 7. The end portions of the entire circumference of the thin film 4 are disposed so as not to come off.

  When the thin film 4 is closed, the compressed fluid is pressed between the thin film 4 and the valve case half 3 so that the central portion of the thin film 10 is formed as shown in FIG. The two thin films 4 are flattened so that they are in close contact with each other over a wide range and can block all the pipes 10.

  On the other hand, by drawing a compressed fluid existing between the thin film 4 and the valve case half 3 to create a vacuum state, it is expanded to the center of the conduit 10 as shown in FIG. 5 or FIG. As shown in FIG. 2 or 4, the two thin films 4 can be brought into close contact with the inner peripheral wall surface of the valve case half 3 in a concave state.

  Next, the use of the pinch valve 1 according to the present invention will be described. A fluid such as gas or liquid existing between the inner wall of the valve case 2 and the thin film 4 is sucked through a joint 9 screwed to the valve case 2 to make a vacuum state, and the thin film 4 is put into the valve case 2 as shown in FIG. Adhere to the inner wall. As a result, the pipe line 10 is fully opened.

  Next, when it is desired to close the pipe line 10, a low-pressure compressed fluid of about 0.02 MPa is press-fitted through the joint 9 screwed to the valve case 2, and the compressed fluid is interposed between the inner wall of the valve case 2 and the thin film 4. Are filled in a short time, and two thin films 4 are brought into close contact with each other as shown in FIG. The pipe line 10 is in a completely closed state.

  As described above, it is possible to manufacture the pinch valve 1 which can be closed by the press-fitting of the low-pressure fluid and can be completely opened by the suction of the press-fitted fluid, and can be reduced in weight with a very simple structure.

DESCRIPTION OF SYMBOLS 1 Pinch valve 2 Valve case 3 Valve case half body 4 Thin film 5 Ring-shaped flange body 6 Frame body 7 Arc-shaped flange body 8 Rod-shaped support body 9 Joint 10 Pipe line 11 Tube 12 Space | gap 21 Flange part 22 Bolt insertion hole 23 Bolt insertion hole Hole 24 Bolt insertion hole 32 Bolt nut 33 Bolt nut 34 Bolt nut 40 Stepped portion

Claims (3)

  In a pinch valve that opens and closes a pipe line through which a fluid such as powder or liquid flows, two valve case halves having a semi-cylindrical shape having flange portions bent in an L shape along the pipe line direction at both ends, A valve case that forms a pipe line by confronting the inner peripheral wall surfaces of the two valve case halves, and an inner peripheral wall surface and an entire end of each of the two valve case halves. The linear end along the pipe line direction is sandwiched together with the flange parts of the two valve case halves, and the arcuate end perpendicular to the pipe line direction is the end of the valve case half. A pinch valve comprising: means including two flexible thin films which are bent and sandwiched between the valve case halves and the like, and the end portions of the entire circumference thereof are prevented from coming off.   In a pinch valve that opens and closes a conduit through which a fluid such as powder or liquid flows, two annular flange bodies disposed at both ends of the pinch valve, and both ends disposed between the two annular flange bodies A frame body having a substantially U-shaped arc-shaped flange body and two rod-shaped support bodies between end portions of the respective arcs between the arc-shaped flange bodies, and one annular flange body. The two arcuate flange bodies are in contact with each other, the frame body in which a pipe line is inserted in a hole formed by facing the two arcuate flange bodies, and disposed inside the two opposed frame bodies The two valve case halves having a semi-cylindrical shape having flange portions bent in an L shape along the pipe line direction at both ends, with the inner peripheral wall surfaces of the two valve case halves facing each other. A valve case forming a path and the two valves Each of the case halves is disposed so as to cover the inner peripheral wall surface and the entire periphery of the end, and the linear end along the pipe line direction is formed by the flanges of the two valve case halves and the rod-like support. The arc-shaped end portion that is clamped and fastened and is perpendicular to the pipe line direction is bent at the end portion of the valve case half, and the ring-shaped flange body, the arc-shaped flange body, and the valve case half body A pinch valve comprising: means including two flexible thin films that are sandwiched and end portions of the entire circumference are prevented from coming off.   A joint for compressing fluid injection and a suction for compressing fluid are arranged on the outer peripheral surfaces of the two valve case halves, respectively, and the two joints and the two thin films are made to correspond to each other and press-fitted through the joints. Each of the corresponding thin films by the compressed fluid extends over the length of the diameter of the pipe formed by the valve case in the direction perpendicular to the pipe direction, and the pipe direction is 50 to 95% of the length between the annular flange bodies. The pipes are closed in close contact with each other over a length, and the pipes are opened by sucking the compressed fluid from the respective joints so that the corresponding thin films are brought into close contact with the inner peripheral wall surface of the valve case half. The pinch valve according to claim 1 or 2, characterized in that:

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