JPH10238639A - Pinch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide superior water cut-off performance under high water pressure by pressing the inside of one side of a tube, which is pressed to a flow path lower stream side of a slope formed in the flow path upper stream side in the tip of a presser member, against the flow path lower stream slope side of a lip in cutting off water and applying a primary side pressure to the flow path upper stream side of the lip. SOLUTION: In cutting off water, a flat part 3a in the tip of a presser member 3 is pressurized so that the inside of one side of a tube 2 is pressed in close contact with the inside in the opposite side. Then, the adjacent 3b1 to the flow path lower stream side end part of a flow path upper stream side slope 3b in the tip of the presser member 3 and a flow path lower stream side slope side 2a1 of a complementary lip 2a are pressed in close contact with each other without any clearance. When a primary side pressure is applied to the flow path upper stream side 2a2 of the lip 2a, the lip 2a is pressed against the one side of the pressing tube 2. The flow path lower stream side slope side 2a1 of the lip 2a and the inside of the one side of the tube 2 faced thereto receive the presser force of the presser member 3 and the primary side pressure P to be pressed in close contact with each other so that high cut-off performance can be provided even under high water pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch valve which presses the tip of a pressing member against one side of a tube made of an elastic material such as rubber and crushes the tube in a direction perpendicular to the longitudinal direction to close a flow path. . Japanese Utility Model Laid-Open No. 47-9015 discloses a pinch valve in which the cross section of a tube is formed in a lip shape, and Japanese Patent Application Laid-Open No. 6-1944 discloses a pinch valve in which a cross section of a tube is formed in a rhombus shape. I have. JP-A-47-9015, JP-A-6-194.
In the pinch valve disclosed in Japanese Patent Application Publication No. 4 (1999), by making the cross-sectional shape of the tube a lip shape and a rhombus shape, it is possible to improve the adhesion between the inner surfaces of the tube when the tube is crushed and to improve the tube when the tube is crushed. The stress at the folded portion is reduced by reducing the amount of deformation of the cross section, and the durability of the pinch valve is improved.

[0002]

Problems to be Solved by the Invention
The pinch valve disclosed in Japanese Unexamined Patent Application Publication No. Hei 6-1944 has the following problems. By simply improving the adhesion between the inner surfaces of the tubes when crushing the tubes, we have achieved water stoppage under high water pressure, such as 17.5 kgf / cm ² , which is required by Japan Nippon Suikyo Co., Ltd. for faucets. Can not. The reduction in the amount of deformation of the tube cross section when the tube is crushed and the reduction in the stress at the folded portion are insufficient, and the improvement in durability cannot be sufficiently achieved. The present invention has been made in view of the above problems, and has as its object to provide a pinch valve that can achieve water stoppage under high water pressure. Still another object of the present invention is to provide a pinch valve having excellent durability.

[0003]

In order to solve the above-mentioned problems, according to the present invention, the tip of a pressing member is pressed against one side of a tube made of an elastic body, and the tube is suspended in the longitudinal direction.
A pinch valve that closes the flow path by crushing in a straight direction , wherein a lip is projected over a half circumference in a cross-sectional view on the inner surface of the tube on the opposite side to the one side, and the flow path downstream side surface of the lip is inclined. A slope is formed on the upstream side of the flow path at the tip of the pressing member, and the inclined surface on the downstream side of the flow path of the lip is complementary to the vicinity of the downstream end of the flow path on the slope formed on the upstream side of the flow path at the tip of the pressing member. The inner surface on one side of the tube pressed to the vicinity of the downstream end of the flow path on the slope formed on the upstream side of the flow path at the tip of the pressing member when water is stopped, the one side inner surface of the tube is inclined toward the downstream side of the flow path of the lip. A pinch valve is provided in which a pressure is applied to a side surface and a primary pressure is applied to a flow path upstream side surface of a lip. In the pinch valve according to the present invention, at the time of water stoppage, the inner surface on one side of the tube pressed toward the vicinity of the downstream end of the flow path on the slope formed on the upstream side of the flow path at the tip of the pressing member has a pressing member. And a lip having a complementary shape and a portion near the downstream end of the flow path downstream of the slope formed on the upstream side of the flow path at the front end of the flow path and closely pressed against the inclined surface on the downstream side of the flow path. When the primary pressure is applied to the flow path upstream side surface of the lip, the primary pressure presses the lip against one side of the tube which closely presses against the flow path downstream inclined side surface of the lip without any gap. The flow path downstream inclined side surface of the lip and the inner surface on one side of the tube opposed thereto receive the pressing force of the pressing member and the primary side pressure and press against each other, so that high water stopping performance is obtained even under high water pressure. . The portion of the tube that is closer to the lip on the one side on the upstream side of the flow path than the portion that is close to the lip on the one side receives the primary pressure and squeezes on the slope formed on the upstream side of the flow path at the tip of the pressing member. As a result, excessive deformation of the portion is suppressed, and the durability of the tube is improved.

[0004] In a preferred aspect of the present invention, a slope is formed on the downstream side of the flow path at the tip of the pressing member. When a slope is formed on the downstream side of the flow path at the tip of the pressing member, even when a secondary pressure is applied to the downstream portion of the tube during water stoppage, the portion is pressed by receiving the secondary pressure. Since it is close to the slope formed on the downstream side of the flow path at the tip of the member, excessive deformation of the portion is suppressed, and the durability of the tube is improved.

[0005] In a preferred aspect of the present invention, the cross section of the portion of the tube pressed by the tip of the pressing member is flat, and the one side of the tube, the opposite side of the tube, and the pressing member of the tube in the cross section. The distal end is formed to be convex in the same direction, and the length of the inner surface on one side of the tube in the cross section is equal to the length of the inner surface on the opposite side. If the cross section of the portion of the tube pressed by the distal end of the pressing member is flat, one side of the tube pressed by the distal end of the pressing member easily comes closer to the opposite side, so that the waterproofness is increased. If the one side of the tube, the opposite side of the tube, and the tip of the pressing member are formed to be convex in the same direction in the cross section of the portion pressed by the tip of the pressing member, the tube is pressed by the tip of the pressing member. One side of the tube is easily snagged on the other side, thus increasing the water stoppage. If the length of the inner surface on one side of the tube in the cross section is equal to the length of the inner surface on the opposite side, no wrinkles will be generated on either side when the two come close together, so that the waterproofness is increased.

In a preferred aspect of the present invention, the shape of the portion of the tube pressed by the tip of the pressing member is substantially the same as when the water is stopped when no load is applied. If the shape of the portion of the tube pressed by the distal end of the pressing member is substantially the same as when water is stopped when no load is applied, the amount of deformation of the portion of the tube pressed by the distal end of the pressing member when water is stopped Is small, and the stress generated in the portion is small. As a result, the durability of the pinch valve is improved.

In a preferred aspect of the present invention, the material of the tube is a fluoro rubber. The durability of the pinch valve is improved by using fluororubber having excellent durability against hypochlorous acid existing in tap water as a material of the tube.

In a preferred aspect of the present invention, a reinforcing sheet is attached around the tube. By attaching a reinforcing sheet around the tube, local deformation of the tube during water flow can be suppressed. As a result, the durability of the pinch valve is improved.

In a preferred aspect of the present invention, a funnel-shaped slope is formed inside the upstream end of the flow passage of the tube and extends toward the upstream of the flow passage. A funnel-shaped slope extending toward the front is formed. When a pinch valve is configured by a tube inserted and mounted in a pipeline and a pressing member that penetrates a side wall of the pipeline, other pipelines are respectively provided at an upstream end and a downstream end of the pipeline in which the tube is mounted. It connects to form a flow path in which the pinch valve is inserted. In this case, a funnel-shaped slope extending toward the upstream of the flow path is formed inside the upstream end of the flow path of the tube, and a funnel-shaped slope extending toward the downstream of the flow path is formed inside the downstream end of the flow path of the tube. If you have
Due to the water pressure applied to the slope, the thin portion near the upstream end of the tube and the thin portion near the downstream end of the tube are in close contact with the pipe wall, and the pipe with the attached tube and the upstream and downstream pipes The connection is shut off.

In a preferred aspect of the present invention, a flange is formed at an upstream end and a downstream end of the flow path of the tube so as to protrude radially outward. When a pinch valve is configured by a tube inserted and mounted in a pipeline and a pressing member that penetrates a side wall of the pipeline, other pipelines are respectively provided at an upstream end and a downstream end of the pipeline in which the tube is mounted. It connects to form a flow path in which the pinch valve is inserted.
In this case, if a flange projecting outward in the radial direction is formed at the upstream end and the downstream end of the flow path of the tube, the flange is formed between the pipe line in which the tube is mounted and the upstream and downstream pipe lines. By sandwiching and pressing, it is possible to easily stop the water at the connection between the pipeline in which the tube is mounted and the upstream and downstream pipelines.

In a preferred aspect of the present invention, an annular projection is formed on an outer edge of the flange so as to project in a longitudinal direction of the tube and in a direction away from the tube.
If an annular projection protruding in the longitudinal direction of the tube and in the direction away from the tube is formed at the outer edge of the flange, the flange is upstream from the conduit in which the tube is mounted,
A high surface pressure is generated at the abutting portion between the annular projection and the pipe line when the pipe is sandwiched between the downstream pipes and pressed, and the connection between the pipe line in which the tube is mounted and the upstream and downstream pipe lines is formed. Water stoppage is improved.

In a preferred aspect of the present invention, the tube is extended in the longitudinal direction beyond the flange, and a funnel-shaped slope extending toward the longitudinal end of the tube is formed inside the extension. When a pinch valve is configured by a tube inserted and mounted in a pipeline and a pressing member that penetrates a side wall of the pipeline, other pipelines are respectively provided at an upstream end and a downstream end of the pipeline in which the tube is mounted. It connects to form a flow path in which the pinch valve is inserted. In this case, if a flange projecting outward in the radial direction is formed at the upstream end and the downstream end of the flow path of the tube, the flange is formed between the pipe line in which the tube is mounted and the upstream and downstream pipe lines. By sandwiching and pressing, it is possible to easily stop the water at the connection between the pipeline in which the tube is mounted and the upstream and downstream pipelines. In addition, if the tube is extended in the longitudinal direction beyond the flange, and a funnel-shaped slope extending toward the longitudinal end of the tube is formed inside the extension, the tube may be extended by water pressure applied to the slope. The thin portion near the end in the direction closely adheres to the pipe wall surface, and the waterproofness of the connection between the pipe in which the tube is mounted and the upstream and downstream pipes is improved.

In a preferred aspect of the present invention, a plurality of the tubes are arranged in parallel, and an upstream or downstream flange is integrated. In some cases, a plurality of pinch valves, each of which includes a tube with a flange inserted and mounted in a conduit and a pressing member penetrating a side wall of the conduit, are used in parallel. In such a case, if the upstream or downstream flange of the tube is integrated, the work of attaching the tube to the pipe becomes easy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pinch valve according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a pinch valve 1 according to the present embodiment includes a fluororubber tube 2 inserted and mounted in a conduit A and a pressing member 3 penetrating a side wall of the conduit A. As shown in the figure, the tip of the pressing member 3 is pressed against one side of the tube 2 to
Is a valve configured to close the flow path B by crushing the flow path B. As shown in FIG. 1, a lip 2 is provided on the inner surface of the tube 2 on the side opposite to the one side over a half circumference in a cross-sectional view.
a is protrudingly provided. Flow path downstream side surface 2a of lip 2a
₁ is inclined. The tip of the pressing member 3 is constituted by a flat surface 3a on the downstream side of the flow path and a slope 3b on the upstream side of the flow path. A flow path downstream inclined side surface 2a ₁ of the lip 2a is the slope 3b of the flow path upstream side of the distal end of the pressing member 3 is formed in a complementary shape to the flow path downstream end near 3b _1. As shown in FIG. 2, when water is stopped, the inner surface on one side of the tube 2 pressed by the flat portion 3 a at the tip of the pressing member 3 comes into pressure contact with the inner surface on the opposite side of the tube 2, and the tip of the pressing member 3 slope 3b of the flow path upstream side, said one side of the inner surface of the tube 2 pressed into the flow path downstream end portion 3b ₁ is pressed against the flow path downstream inclined side surface 2a ₁ of the lip 2a, the flow of the lip 2a the path upstream side surface 2a ₂ added is the primary pressure P.

As shown in FIG. 1B, the cross section of the portion of the tube 2 pressed by the tip of the pressing member 3 is flat, and the tip of the pressing member 3 of the tube 2 in the cross section is pressed. One side, the opposite side of the one side, and the tip of the pressing member 3 are formed so as to protrude in the same direction, and the length of the inner surface of the one side of the tube 2 in the cross section (the length of the cross section) The length of the inner surface on the pressing member 3 side with respect to the center line X extending in the axial direction) L1, and the length of the inner surface on the opposite side (the length of the inner surface on the side separated from the pressing member 3 with respect to the center line X) ) Is equal to L2.

In the pinch valve 1 according to the present embodiment having the above-described configuration, when water is supplied, the tube 2 maintains substantially the same configuration as that at the time of no load shown in FIG. When the water is stopped,
As shown in FIG. 2, the inner surface on one side of the tube 2 pressed by the flat portion 3 a at the distal end of the pressing member 3 is pressed against the inner surface on the opposite side of the tube 2, and the distal end of the pressing member 3 is on the upstream side of the flow path. the slope 3b, the one side of the inner surface of the tube 2 pressed into the flow path downstream end portion 3b ₁ is slope 3b of the flow path upstream side of the distal end of the pressing member 3, the flow path downstream end portion 3b ₁ complementary shape to press nestled without a gap in the flow path downstream inclined side surface 2a ₁ of the lip 2a. The flow path upstream side surface 2a ₂ of the lip 2a joined by the primary pressure P, by the primary pressure P, the lip 2a is the flow path downstream inclined side surface 2a ₁ to the side of the tube 2 to be pressed nestled without a gap Pressed. The flow path downstream side 2a ₁ of the lip 2a, and the one side of the inner surface of the tube 2 facing thereto, the pressing member 3
And presses against each other under the pressure P and the primary side pressure P, so that high water stopping performance can be obtained even under high water pressure.

In the pinch valve 1 according to the present embodiment, as shown in FIG. 1B, the cross section of the portion of the tube 2 pressed by the tip of the pressing member 3 is flat. 2 (b), the one side of the tube 2 pressed by the tip of the pressing member 3 easily slides toward the opposite side. As a result, the water stoppage increases. As shown in FIG. 1B, the one side of the tube 2 and the opposite side of the tube 2 facing the one side in a cross section of a portion pressed by the tip of the pressing member 3.
Since the tip of the pressing member 3 is formed to be convex in the same direction, as can be seen from FIGS. 1B and 2B, the one side of the tube 2 pressed by the tip of the pressing member 3 is Easily snuggle to the other side. As a result, the water stoppage increases. As shown in FIG. 1B, the length L1 of the inner surface on one side of the tube 2 and the length L2 of the inner surface on the opposite side in the cross section of the portion pressed by the tip of the pressing member 3 are equal. As can be seen from FIG. 2B, no wrinkles occur on either side when the two come close together. As a result, the water stoppage increases.

In the pinch valve 1 according to the present embodiment, the tube 2 is made of fluororubber having excellent durability against hypochlorous acid present in tap water. As a result, the durability of the pinch valve 1 is improved.

A pinch valve according to a second embodiment of the present invention will be described with reference to FIGS. In the pinch valve 11 according to the present embodiment, as can be seen from FIG. 3, the shape of the portion of the tube 12 pressed by the tip of the pressing member 13 is the same as the tube 2 of the pinch valve 1 according to the first embodiment.
It is formed to be more flat compared to. As a result, as can be seen from FIG. 3 and FIG.
The shape of the part pressed by the tip of 3 is substantially the same as when stopping water when there is no load. As can be seen from FIG.
When no load is applied, the tip of the pressing member 13 is
Not in contact with Except for the above, the structure of the pinch valve 11 according to the present embodiment is different from that of the pinch valve 1 according to the first embodiment.
It is the same as the structure of FIG.

In the pinch valve 11 according to this embodiment, when water is supplied, as shown in FIG.
The region pressed by the tip of the pressing member 13 is the hydraulic pressure p.
Spread by. At this time, the tube 12, especially the folded portion 12b of the tube 12, is deformed and generates stress. However, since the water pressure p when flowing water is relatively low, the stress is relatively small. Therefore, there is no possibility that the durability of the tube 12 and the durability of the pinch valve 11 may be reduced by the stress. In the pinch valve 11 according to the present embodiment, at the time of water stoppage, as in the pinch valve 1 according to the first embodiment, as shown in FIG. The flow path upstream side surface 12 of the lip 12 a is pressed against the inner surface on the opposite side of the tube 12.
a ₂ to be joined by the primary pressure P, the lip 12a is pressed against the one side F of the tube 12. Due to the pressing force of the pressing member 13 and the primary-side pressure P, high water stoppage can be obtained even under high water pressure. In the pinch valve 11 according to the present embodiment, as can be seen from FIGS. 3B and 5B, the shape of the portion pressed by the tip of the pressing member 13 is substantially the same as when water is stopped when no load is applied. Since it is the same, when water is stopped, the deformation of the portion of the tube 12 pressed by the tip of the pressing member 13, particularly the deformation of the folded portion 12 b is small, and the portion pressed by the tip of the pressing member 13 The generated stress, particularly the stress generated in the folded portion 12b, is small. As a result, the durability of the tube 12 and the durability of the pinch valve 11 are improved.

A pinch valve according to a third embodiment of the present invention will be described with reference to FIG. In the pinch valve 21 according to the present embodiment, as shown in FIG.
3b is formed, and a slope 23c is also formed on the downstream side of the flow path. Except for the above, the structure of the pinch valve 21 according to the present embodiment is the same as the structure of the pinch valve 1 according to the first embodiment. In the pinch valve 21, as shown in FIG. 6, when the water stop, the primary pressure P ₁ on the upstream side of the portion of the tube 22 but is applied, in addition to the tube 22
Even if the secondary pressure P ₂ is applied to the downstream portion of the pressure member, the portion receives the secondary pressure P ₂ and squeezes on the slope 23 c formed on the downstream side of the flow path at the tip of the pressing member 23. Excessive deformation of the portion is suppressed, and the durability of the tube 22 is improved. In the pinch valve 1 according to the first embodiment in which a slope is not formed on the downstream side of the flow path at the distal end of the pressing member 3, when the secondary pressure P ₂ is applied to the downstream portion of the tube 2 at the time of water stoppage. As shown in FIG. 7, the portion is bent at a right angle and is excessively deformed. As a result, tube 2
The durability of the steel is reduced.

In the first embodiment, a reinforcing sheet may be attached around the tube 2. In the configuration of the first embodiment, as shown in FIG.
Slope 3 formed at the tip of pressing member 3 by water pressure p
There is a possibility that the tube 2 is pushed into the triangular depression between the b and the pipe A, and high stress is generated in the pushed-in portion, so that the durability of the tube 2 is reduced. As shown in FIG. 9, a reinforcing sheet 4 is attached around the tube 2 to increase the rigidity of the tube 2, thereby suppressing local deformation of the tube 2 during passage of water as shown in FIG. Can be suppressed, and the durability of the tube 2 and the durability of the pinch valve 1 can be improved.

The cross-sectional shape of the lips 2a, 12a may be any shape as long as the side surface on the downstream side of the flow path is inclined. It may be triangular, trapezoidal, parallelogram, semicircular, or semielliptical.

The material of the tubes 2 and 12 is not limited to fluoro rubber. Any material may be used as long as the material has appropriate flexibility, elasticity, and water tightness.

A flow path in which another pipe is connected to a pinch valve constituted by a tube inserted and mounted in the pipe and a pressing member penetrating the side wall of the pipe, and in which the pinch valve is inserted. Will be described. As shown in FIG. 10, the tube 32 inserted and mounted in the conduit A
And the pressing member 33 penetrating the side wall of the pipe A, the pinch valve 31 is constituted. An inclined surface 33b is formed on the upstream side of the flow path at the tip of the pressing member 33, and a lip 32a is formed on the inner surface of the tube 32 so as to face the inclined surface 33b. Flanges 32b and 32c projecting radially outward are formed at the upstream end and the downstream end of the flow path of the tube 32, respectively. The flanges 32b and 32c are fitted into annular concave portions formed at the upstream end and the downstream end of the pipe A. The end surfaces of the flanges 32b and 32c slightly protrude from the upstream end and the downstream end of the pipeline A. The downstream end of the pipe B is in contact with the upstream end of the pipe A. The end face of the flange 32b slightly projecting from the upstream end of the pipe A is fitted into an annular concave portion formed at the downstream end of the pipe B. The upstream end of the pipe C is in contact with the downstream end of the pipe A. An annular recess formed at the upstream end of the pipe C has a flange 32c slightly projecting from the downstream end of the pipe A.
Are fitted. A flow path D in which the pinch valve 31 is inserted is formed by the pipelines B, A, and C.

In the flow path D, there is a problem of water stoppage at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. Since flanges 32b and 32c protruding radially outward are formed at the downstream end of the road, the flanges 32b and 32c are sandwiched between the pipelines A, B and C, and pressed to form a connection between the pipelines A and B. The connection portion and the connection portion between the pipe A and the pipe C can be easily stopped. Therefore,
There is no need to separately insert an O-ring, flat packing, or the like at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. In addition, since the flanges 32b and 32c are provided, when the tube 32 is mounted on the conduit A, the tube 32 is automatically and correctly positioned in the longitudinal direction with respect to the conduit A.

As shown in FIG. 11, a pinch valve 41 is constituted by a tube 42 inserted and mounted in a pipe A and a pressing member 43 penetrating the side wall of the pipe A. A slope 43b is formed on the upstream side of the flow path at the tip of the pressing member 43, and a lip 42a is formed on the inner surface of the tube 42 so as to face the slope 43b. A flange 42 protruding radially outward at the upstream end and the downstream end of the flow path of the tube 42.
b, 42c are formed. Flanges 42b, 42c
Are fitted in annular concave portions formed at the upstream end and the downstream end of the pipe A. The end faces of the flanges 42b and 42c are pipe A
Slightly protrude from the upstream end and the downstream end of the. Flange 4
Annular projections 42b 'and 42c' are formed on the outer edges of the end faces of the end faces 2b and 42c so as to protrude in the longitudinal direction of the tube 42 and in the direction away from the tube 42. The downstream end of the pipe B is in contact with the upstream end of the pipe A. The end face of the flange 42b slightly projecting from the upstream end of the pipe A and the projection 42b 'are fitted into an annular concave portion formed at the downstream end of the pipe B. The upstream end of the pipe C is in contact with the downstream end of the pipe A. The end face of the flange 32c slightly projecting from the downstream end of the pipe A and the projection 42c 'are fitted into an annular concave portion formed at the upstream end of the pipe C. A flow path D in which the pinch valve 41 is inserted is formed by the pipelines B, A, and C.

In the flow path D, there is a problem of water stoppage at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. Since flanges 42b and 42c projecting radially outward from the downstream end of the road are formed, the flanges 42b and 42c are sandwiched between the pipelines A, B and C and pressed to form a connection between the pipelines A and B. The connection portion and the connection portion between the pipe A and the pipe C can be easily stopped. Therefore,
There is no need to separately insert an O-ring, flat packing, or the like at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. In addition, since annular projections 42b 'and 42c' projecting in the longitudinal direction of the tube 42 and in the direction away from the tube 42 are formed on the outer edges of the end surfaces of the flanges 42b and 42c, the flanges 42b and 42c are connected to the pipeline A, B, C
When compressed by being sandwiched between the pipes, a high surface pressure is generated at the contact portions between the annular projections 42b 'and 42c' and the pipes B and C, and the connection between the pipes A and B, the pipe A The waterproofness of the connection with the pipe C is improved.

As shown in FIG. 12, a pinch valve 51 is constituted by a tube 52 inserted and mounted in a pipe A and a pressing member 53 penetrating the side wall of the pipe A. A slope 53b is formed on the upstream side of the flow path at the tip of the pressing member 53, and a lip 52a is formed on the inner surface of the tube 52 so as to face the slope 53b. Flange 52 projecting radially outward at the upstream end and the downstream end of the flow path of tube 52
b, 52c are formed. Flanges 52b, 52c
Are fitted in annular concave portions formed at the upstream end and the downstream end of the pipe A. The end faces of the flanges 52b and 52c are pipe A
Slightly protrude from the upstream end and the downstream end of the. Flange 5
The tube 52 is extended in the longitudinal direction beyond 2b and 52c, and inside the extension, funnel-shaped slopes 52b 'and 52c' are formed extending toward the longitudinal end of the tube. The downstream end of the pipe B is in contact with the upstream end of the pipe A.
The end face of the flange 52b slightly projecting from the upstream end of the pipe A and the extension 52b 'of the tube 52 are fitted into an annular concave portion formed at the downstream end of the pipe B. The upstream end of the pipe C is in contact with the downstream end of the pipe A. An annular recess formed at the upstream end of the pipe C has an end face of a flange 52c slightly projecting from the downstream end of the pipe A and an extension 52 of the tube 52.
c ′ are fitted. A flow path D in which the pinch valve 51 is inserted is formed by the pipes B, A, and C.

In the flow path D, there is a problem of water stoppage at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. Since flanges 52b and 52c protruding radially outward are formed at the downstream end of the road, the flanges 52b and 52c are sandwiched between the pipelines A, B and C and pressed to form a connection between the pipelines A and B. The connection portion and the connection portion between the pipe A and the pipe C can be easily stopped. Therefore,
There is no need to separately insert an O-ring, flat packing, or the like at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. In addition, the tube 5 exceeds the flanges 52b and 52c.
2 are extended in the longitudinal direction, and a tube 52 is provided inside the extension.
Funnel-shaped slope 52 extending toward the longitudinal end of the
b ′, 52c ′ are formed, so that the slopes 52b ′,
The thin portion near the longitudinal end of the tube 52 is brought into close contact with the wall surfaces of the conduits B and C by the water pressure applied to the conduit 52c ', and the conduit A
Of the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C are improved.

As shown in FIG. 13, a pinch valve 61 is constituted by a tube 62 inserted and mounted in a conduit A and a pressing member 63 penetrating the side wall of the conduit A. A slope 63b is formed on the upstream side of the flow path at the tip of the pressing member 63, and a lip 62a is formed on the inner surface of the tube 62 so as to face the slope 63b. A funnel-shaped slope 62 extending toward the upstream of the flow path inside the upstream end of the flow path of the tube 62.
b is formed, and a funnel-shaped inclined surface 62c that extends toward the downstream side of the flow path is formed inside the downstream end of the flow path of the tube 62. The flow path upstream end and the flow path downstream end of the tube 62 slightly protrude from the upstream end and the downstream end of the pipe A. Pipe A
The downstream end of the pipeline B is in contact with the upstream end. The upstream end of the tube 62 slightly projecting from the upstream end of the pipe A is fitted into an annular recess formed at the downstream end of the pipe B. The upstream end of the pipe C is in contact with the downstream end of the pipe A. The downstream end of a tube 62 slightly projecting from the downstream end of the pipe A is fitted into an annular recess formed at the upstream end of the pipe C. A flow path D in which the pinch valve 61 is inserted is formed by the pipelines B, A, and C.

In the flow path D, there is a problem of water stoppage at the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. A funnel-shaped slope 62b extending toward the upstream of the flow path is formed in the tube 6.
Since a funnel-shaped slope 62c extending toward the downstream of the flow path is formed inside the downstream end of the second flow path, the slopes 62b, 6
Due to the water pressure applied to 2c, the thin portion near the upstream end of the flow path and near the downstream end of the flow path of the tube 62 adheres to the wall surfaces of the pipes B and C, and the connection between the pipes A and B, the pipe A The connection with the pipe C is stopped. Therefore, it is not necessary to insert an O-ring, a flat packing, or the like into the connection between the pipe A and the pipe B and the connection between the pipe A and the pipe C. As shown in FIG. 14, the slopes 62 b and 62 c are formed by annular projections B ₁ formed at the upstream end of the pipe A and the downstream end of the pipe B.
Sandwiched in between the protrusions C ₁ having an annular slope formed in the upstream end of the downstream end portion and the flow path C, the slope 62b, may be configured to compress the portion of the 62c. According to such a configuration, a high surface pressure is generated at the contact surface between the thin portion near the upstream end of the flow channel of the tube 62 and the thin portion near the downstream end of the flow channel and the pipes A, B, and C. The connection between the pipe B and the connection between the pipe A and the pipe C is stopped.

A case will be described in which a plurality of pinch valves each composed of a tube with a flange inserted and mounted in a conduit and a pressing member penetrating the side wall of the conduit are used in parallel. As shown in FIG. 15, a pinch valve 71 is configured by a tube 72 inserted and attached to the pipe A and a pressing member 73 penetrating the side wall of the pipe A. A slope 73 b is provided on the upstream side of the flow path at the tip of the pressing member 73.
Is formed, and a lip 72a is formed on the inner surface of the tube 72 so as to face the inclined surface 73b. Flanges 72b and 72c projecting radially outward are formed at the upstream end and the downstream end of the flow path of the tube 72. Flanges 72b, 7
2c is fitted into an annular concave portion formed at the upstream end and the downstream end of the pipe A. Tube 72 'inserted and mounted in conduit A' and pressing member 7 penetrating the side wall of conduit A '
3 'constitute a pinch valve 71'.
A slope 73b 'is formed on the upstream side of the flow path at the tip of the pressing member 73', and a lip 72a 'is formed on the inner surface of the tube 72' so as to face the slope 73b '. Flanges 72b 'and 72c' projecting radially outward are formed at the upstream end and the downstream end of the flow path of the tube 72 '. Flange 7
2b 'and 72c' are fitted into annular concave portions formed at the upstream end and the downstream end of the pipeline A '. The pinch valve 71 and the pinch valve 71 'are arranged in parallel. The flanges 72b and 72b 'are integrated. Pipe A and pipe A 'are integrated. Pressing members 73, 73 '
Faces the central through-hole E of the pipe formed by integrating the pipe A and the pipe A '.

A spindle 80 shown in FIG. 16 is inserted into the central through hole E so as to be movable in the longitudinal direction. The spindle 80 has a cylindrical portion 80a and an eccentric conical column portion 80b. When the cylindrical portion 80a is in contact with the pressing members 73 and 73 ', the pressing members 73 and 73'
2 and 72 ', and are pinched by the pinch valves 71 and 71'.
Is closed. The eccentric conical column portion 80b is the pressing member 7
When the spindle 80 is rotated in a state where the tubes 72, 72 'of the pressing members 73, 73' are in contact with the tubes 73, 73 ', respectively.
The pushing amount to the side changes, and the pinch valves 71, 71 '
And the fluid passing through the pinch valve 71,
The flow ratio of the fluid passing through the pinch valve 71 'changes. When the spindle is moved in the longitudinal direction in a state where the eccentric conical column portion 80b is in contact with the pressing members 73 and 73 ',
The pushing amount of the pressing members 73, 73 'toward the tubes 72, 72' changes, the opening degree of the pinch valves 71, 71 'changes, and the fluid passing through the pinch valve 71 and the fluid passing through the pinch valve 71'. Fluid flow rate changes.

Since the flange 72b and the flange 72b 'are integrated, the tube 7 is connected to the pipe A and the pipe A'.
The mounting operation of 2, 72 'is easier than when the tubes 72, 72' are completely independent. Note that the flanges 72c and 72c 'may be integrated instead of the flanges 72b and 72b'.

For the pinch valve 1 of the first embodiment and the pinch valve from which the lip 2a was removed from the pinch valve 1, a comparative test of the water stopping performance was performed. The test results are shown in FIG. From FIG. 17, it can be seen that the pinch valve 1 of the first embodiment has higher water stopping performance than the pinch valve having no lip.

[0037]

In the pinch valve according to the present invention,
At the time of water stoppage, the inner surface on one side of the tube pressed toward the vicinity of the downstream end of the flow path on the slope formed on the upstream side of the flow path at the tip of the pressing member has a lip protruding on the opposite side of the tube. The pressing member is pressed against the downstream side inclined side surface of the complementary shape with the vicinity of the downstream end of the flow path on the slope formed on the upstream side of the flow path at the front end of the pressing member without any gap. When the primary pressure is applied to the flow path upstream side surface of the lip, the primary pressure presses the lip against one side of the tube which closely presses against the flow path downstream inclined side surface of the lip without any gap. The flow path downstream inclined side surface of the lip and the inner surface on one side of the tube opposed thereto receive the pressing force of the pressing member and the primary side pressure and press against each other, so that high water stopping performance is obtained even under high water pressure. .

When a slope is formed on the downstream side of the flow path at the tip of the pressing member, even if a secondary pressure is applied to the downstream portion of the tube at the time of stopping water, the portion receives the secondary pressure. As a result, the distal end of the pressing member comes closer to the slope formed on the downstream side of the flow path, so that excessive deformation of the portion is suppressed, and the durability of the tube is improved.

If the cross section of the portion of the tube pressed by the distal end of the pressing member is flattened, one side of the tube pressed by the distal end of the pressing member easily slides to the opposite side, so that the waterproofness is increased. If the one side of the tube, the opposite side of the tube, and the tip of the pressing member are formed to be convex in the same direction in the cross section of the portion pressed by the tip of the pressing member, the tube pressed by the tip of the pressing member One side easily slides to the other side, thus increasing the water stopping performance. If the length of the inner surface on one side of the tube in the cross section is equal to the length of the inner surface on the opposite side,
No wrinkles are formed on either side when the two snuggle together, thus increasing the water stopping performance.

If the shape of the portion of the tube pressed by the distal end of the pressing member is substantially the same as that when the water is stopped when no load is applied, the tube is pressed by the distal end of the pressing member when the water is stopped. The deformation of the part is small, and the stress generated in the part is small. As a result, the durability of the pinch valve is improved.

The durability of the pinch valve is improved by using fluororubber having excellent durability against hypochlorous acid existing in tap water as a material of the tube.

By attaching a reinforcing sheet around the tube, local deformation of the tube during water flow can be suppressed. As a result, the durability of the pinch valve is improved.

When a pinch valve is constituted by a tube inserted and mounted on a conduit and a pressing member penetrating the side wall of the conduit, other upstream and downstream ends of the conduit on which the tube is mounted are respectively provided. The pipes are connected to form a flow path in which the pinch valve is inserted. In this case, a funnel-shaped slope extending toward the upstream of the flow path is formed inside the upstream end of the flow path of the tube, and a funnel-shaped slope extending toward the downstream of the flow path is formed inside the downstream end of the flow path of the tube. If it is, the thin portion of the tube near the upstream end of the flow channel and the thin portion near the downstream end of the flow channel adhere to the pipe wall surface due to the water pressure applied to the slope, and the pipe with the tube mounted and the upstream and downstream The connection with the pipeline is stopped. As a result, it is not necessary to separately insert an O-ring or a flat packing into a connection portion between the pipeline in which the tube is mounted and another pipeline.

In the case where a pinch valve is constituted by a tube inserted and mounted on the conduit and a pressing member penetrating the side wall of the conduit, the upstream end and the downstream end of the conduit on which the tube is mounted are respectively connected to other ends. The pipes are connected to form a flow path in which the pinch valve is inserted. In this case, if a flange projecting outward in the radial direction is formed at the upstream end and the downstream end of the flow path of the tube, the flange is formed between the pipe line in which the tube is mounted and the upstream and downstream pipe lines. By sandwiching and pressing, it is possible to easily stop the water at the connection between the pipeline in which the tube is mounted and the upstream and downstream pipelines. As a result, it is not necessary to separately insert an O-ring or a flat packing into a connection portion between the pipeline in which the tube is mounted and another pipeline.

If an annular projection protruding in the longitudinal direction of the tube and in the direction away from the tube is formed on the outer edge of the flange, the flange is sandwiched between the conduit in which the tube is mounted and the upstream and downstream conduits. During the compression, a high surface pressure is generated at the contact portion between the annular projection and the pipeline, and the water stoppage at the connection between the pipeline in which the tube is mounted and the upstream and downstream pipelines is improved.

When a pinch valve is constituted by a tube inserted and mounted in a conduit and a pressing member penetrating through the side wall of the conduit, another upstream end and a downstream end of the conduit in which the tube is mounted are respectively provided with other pins. The pipes are connected to form a flow path in which the pinch valve is inserted. In this case, if a flange projecting outward in the radial direction is formed at the upstream end and the downstream end of the flow path of the tube, the flange is formed between the pipe line in which the tube is mounted and the upstream and downstream pipe lines. By sandwiching and pressing, it is possible to easily stop the water at the connection between the pipeline in which the tube is mounted and the upstream and downstream pipelines. In addition, if the tube is extended in the longitudinal direction beyond the flange, and a funnel-shaped slope extending toward the longitudinal end of the tube is formed inside the extension, the tube may be extended by water pressure applied to the slope. The thin portion near the end in the direction closely adheres to the pipe wall surface, and the waterproofness of the connection between the pipe in which the tube is mounted and the upstream and downstream pipes is improved.

In some cases, a plurality of pinch valves constituted by a tube with a flange inserted and mounted in a conduit and a pressing member penetrating the side wall of the conduit are used in parallel. In such a case, if the upstream or downstream flange is integrated, the work of attaching the tube to the pipeline becomes easy.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a state of a pinch valve according to a first embodiment of the present invention when no load is applied. (A) is a longitudinal sectional view, (b) is a bb arrow view of (a).

FIG. 2 is a structural diagram showing a state of the pinch valve according to the first embodiment of the present invention when water is stopped. (A) is a longitudinal sectional view, (b) is a bb arrow view of (a).

FIG. 3 is a structural diagram showing a state of a pinch valve according to a second embodiment of the present invention when there is no load; (A) is a longitudinal sectional view, (b) is a bb arrow view of (a).

FIG. 4 is a structural diagram showing a state when water is passed through a pinch valve according to a second embodiment of the present invention. (A) is a longitudinal sectional view, (b) is a bb arrow view of (a).

FIG. 5 is a structural diagram showing a state of a pinch valve according to a second embodiment of the present invention when water is stopped. (A) is a longitudinal sectional view, (b) is a bb arrow view of (a).

FIG. 6 is a structural diagram showing a state where a secondary pressure is applied in addition to a primary pressure when water is passed through a pinch valve according to a third embodiment of the present invention.

FIG. 7 is a structural view showing a state in which a secondary pressure is applied in addition to the primary pressure when water is passed through the pinch valve according to the first embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view of a pinch valve, showing a modification of a tube that can occur when water is passed without reinforcing the tube.

FIG. 9 is a vertical cross-sectional view of the pinch valve, showing a state of the tube at the time of flowing water when the tube is reinforced.

FIG. 10 is a flow chart in which another pipe is connected to a pinch valve constituted by a tube inserted and attached to a pipe and a pressing member penetrating a side wall of the pipe, and the pinch valve is inserted. It is a longitudinal section of a pinch valve explaining the case where a path is formed.

FIG. 11 is a diagram showing a flow in which another pipe is connected to a pinch valve constituted by a tube inserted and mounted in a pipe and a pressing member penetrating a side wall of the pipe, and the pinch valve is inserted. It is a longitudinal section of a pinch valve explaining the case where a path is formed.

FIG. 12 is a flow chart in which another pipe is connected to a pinch valve constituted by a tube inserted and mounted in a pipe and a pressing member penetrating a side wall of the pipe, and the pinch valve is inserted. It is a longitudinal section of a pinch valve explaining the case where a path is formed.

FIG. 13 is a flow chart in which another pipe is connected to a pinch valve constituted by a tube inserted and mounted in a pipe and a pressing member penetrating the side wall of the pipe, and the pinch valve is inserted. It is a longitudinal section of a pinch valve explaining the case where a path is formed.

FIG. 14 is a diagram illustrating a flow in which another pipe is connected to a pinch valve constituted by a tube inserted and mounted in a pipe and a pressing member penetrating a side wall of the pipe, and the pinch valve is inserted. It is a longitudinal section of a pinch valve explaining the case where a path is formed.

FIG. 15 is a longitudinal sectional view of a pinch valve illustrating a case in which a plurality of pinch valves each including a tube with a flange inserted and mounted in a conduit and a pressing member penetrating a side wall of the conduit are used side by side; FIG. (A)
Is an end view on the downstream side, (b) is an end view on the upstream side, (c) is a cross-sectional view along the line aa of (a), and (d) is a line bb of (a). It is sectional drawing.

FIG. 16 is a perspective view of a spindle that drives a pressing member of a pinch valve.

FIG. 17 is a graph showing the results of a water-stop performance comparison test performed on the pinch valve according to the first embodiment and a pinch valve with a lip removed from the pinch valve.

[Explanation of symbols]

1, 11, 21, 31, 41, 51, 61, 71 Pinch valve 2, 12, 22, 32, 42, 52, 62, 72 Tube 2a, 12a, 22a, 32a, 42a, 52a, 62
a, 72a Lip 3, 13, 23, 33, 43, 53, 63, 73 Pressing member 32b, 42b, 52b, 72b, 72b 'Flange 32c, 42c, 52c, 72c, 72c' Flange 42b ', 42c' Projection 52b ', 52c', 62b, 62c slope 4 reinforcing sheet A, B, C, A 'line B _1, C ₁ projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoichiro Himuro 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi Inside East Ceramics Co., Ltd. (72) Inventor Minoru Sato 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi No. Tohoku Kikai Co., Ltd. (72) Inventor Eiji Fukuzawa 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi Into Tohki Kikai Co., Ltd. (72) Inventor Kazuyuki Watanabe 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi No. East Ceramics Co., Ltd.

Claims (11)

[Claims] 1. A pinch valve for pressing a distal end of a pressing member against one side of a tube made of an elastic body and crushing the tube in a direction perpendicular to a longitudinal direction to close a flow path, wherein the tube on the opposite side to the one side is provided. A lip is projected on the inner surface over a half circumference in a cross-sectional view, and the flow path downstream side surface of the lip is inclined,
A slope is formed on the upstream side of the flow path at the end of the pressing member, and the inclined surface on the downstream side of the flow path of the lip is complementary to the vicinity of the downstream end of the flow path on the slope formed on the upstream side of the flow path at the end of the pressing member. The inner surface on one side of the tube pushed toward the vicinity of the downstream end of the flow path on the slope formed at the upstream side of the flow path at the tip of the pressing member when the water is stopped is the inclined surface on the downstream side of the flow path of the lip. A pinch valve, wherein a primary pressure is applied to a side surface of the lip on the upstream side of the flow path. 2. The pinch valve according to claim 1, wherein a slope is formed on a downstream side of a flow path at a tip of the pressing member. 3. A cross section of a portion of the tube pressed by a tip of a pressing member is flat, and the one side of the tube, the opposite side of the tube, and the tip of the pressing member in the cross section are in the same direction. The pinch valve according to claim 1, wherein the length of the inner surface on one side of the tube in the cross section is equal to the length of the inner surface on the opposite side in the cross section. 4. The tube according to claim 1, wherein a shape of a portion of the tube pressed by a distal end of the pressing member is substantially the same as when water is stopped when no load is applied. The pinch valve according to 1. 5. The pinch valve according to claim 1, wherein a material of the tube is a fluoro rubber. 6. The pinch valve according to claim 1, wherein a reinforcing sheet is attached around the tube. 7. A funnel-shaped slope extending toward the upstream of the flow path is formed inside the upstream end of the flow path of the tube, and a funnel-shaped slope extending toward the downstream of the flow path inside the downstream end of the flow path of the tube. The pinch valve according to any one of claims 1 to 6, wherein a slope is formed. 8. The tube according to claim 1, wherein a flange projecting radially outward is formed at an upstream end and a downstream end of the flow path of the tube. Pinch valve. 9. The pinch valve according to claim 8, wherein an annular projection protruding in a longitudinal direction of the tube and in a direction away from the tube is formed on an outer edge of the flange. 10. The tube extends longitudinally beyond the flange, and a funnel-shaped bevel is formed inside the extension toward the longitudinal end of the tube. The pinch valve according to 1. 11. The pinch valve according to claim 8, wherein a plurality of the tubes are arranged in parallel, and an upstream or downstream flange is integrated.