JPS5949457B2 - pinch valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinch valve mainly used as a channel opening/closing device.

Conventionally, pinch valves have been used as a simple pulp mainly for experimental purposes, medical purposes, and the like.

As shown in FIG. 1, the above-mentioned conventional device clamps a flexible tube such as a rubber tube or a synthetic resin tube and presses the inner wall surfaces of the tubes together to block a flow path.

However, if we look closely at the pinched portion of this pinch pulp, we find that the bending conditions at both ends of the bent portions 2, 2 are severe, and when this portion is enlarged, there is a minute void 1 in the bent portion as shown in Figure 2. is completed.

It is difficult to eliminate the void space with a light clamping pressure, and only when the cavity 1 is crushed and clamping pressure is applied to the right degree will the flow path be reliably blocked.

However, if this state is maintained for a long period of time, or if the clamping and releasing of the clamping portions, that is, the opening and closing operations are repeated for a long period of time, permanent deformation or cracks occur in the bent portions 2, 2.

In this respect, it has the disadvantage of lower durability than other lift valves.

Therefore, at present, this type of pinch valve is normally used only in applications where a small amount of leakage is allowed in a low-pressure flow path.

On the other hand, flexible tubes with a special cross-sectional shape,
For example, German Patent No. 88441 (Figures 3-4), a pair of ribs with a cross section matching the bent portions 2 and 2 are provided parallel to the inner surface of the tube wall, for example, German Patent No. 2220860 (
Fig. 5) is publicly known, and although these pinch pulps alleviate the above-mentioned drawbacks to some extent, they basically do not eliminate the drawbacks, and the process up to the blockage of the flow path is difficult. In this case, the flexible tube must be compressed so as to crush the void 1 that has been created.

In this type of pinch pulp, the present invention prevents extreme deformation of the bent portion in the flow path blocking state, so that even if a minute void occurs in the bent portion, a reliable flow path blocking state can be achieved. The task is to make it possible to do so.

The technical means of the present invention to solve the above problems is to make a rib protrude annularly within the tube wall so that the surface of the rib is oblique with respect to the direction of flow in the flexible tube. The rib forming area is compressed from above and below, and the outer periphery of the clamping part of the clamping member is located inside the joint between the rib and the pipe wall.

According to the above technical means of the present invention, the following effects can be obtained.

The virtual surface including the annular rib protruding from the inner wall of the flexible tube obliquely blocks the flow inside the flexible tube, and when the valve is open, the opening formed by the inner peripheral edge of the annular rib is It becomes a distribution channel.

In other words, the opening is formed in a partition wall that obliquely blocks the upstream side and the downstream side of the flexible tube.

From this state, when the rib forming area of the flexible tube is pinched from above and below, the outer periphery of the pinching part of the pinching member pinches the inner part of the joint between the rib and the tube wall, and the tube wall near the rib is pressed against the rib. is pressed all around the top and bottom of the container, and the opening that serves as the flow path is closed.
The flow path within the flexible tube is reliably blocked.

At this time, the portion of the pinching member located outside the outer periphery of the pinching part (bent part 2, etc.) is not pinched, and voids are created above and below the ribs on the outer periphery of the pinching part. are blocked by the ribs, so the flow path within the flexible tube is blocked despite the above-mentioned void space.

Therefore, there is no need to apply pressure with a clamping member until the cavity is crushed as in the past, and extreme deformation of the pipe wall at the bend can be prevented, making it difficult for cracks, permanent deformation, etc. to occur in the bend. Improves durability.

The present invention has the following unique effects.

(1) Since a reliable flow-blocking state can be obtained with a void formed on the outer periphery of the clamping portion of the flexible tube, the clamping pressure is reduced accordingly.

(2) In particular, bent parts that become pipe wall parts with a large degree of deformation, etc.
Since the root portion of the rift is not compressed, the clamping pressure can be further reduced, and the durability of the bent portion etc. can be further improved.

(3) Since the ribs are provided diagonally with respect to the direction of flow in the flexible tube, compared to conventional ribs provided perpendicularly to the direction of IJ-JI flow as shown in Figures 3 and 4. Therefore, the cross-sectional reduction ratio due to the ribs is reduced, and the increase in passing resistance due to the IJ ribs can be kept low.

On the other hand, since it is a flexible tube partially provided with ribs,
Compared to the conventional example shown in FIG. 5 in which ribs are provided over the entire area of the flexible tube in the direction of flow, the overall increase in passage resistance can be suppressed to a low level.

(4) The opening (flow path) that the tip of the rift forms is double-blocked by the upper and lower pipe walls, which further improves the flow rate when the valve is closed, and prevents dust from adhering to one side of the rib. Even if you do, there will be no leakage.

Hereinafter, details of embodiments of the present invention will be explained based on the drawings.

The flexible tube 3 used in the pinch valve of this embodiment has a structure shown in FIGS. 6 and 7, and has ribs 4 on the inner wall surface of the flexible tube.
are integrally formed, and the ribs of and are in the form of a closed ring.

Furthermore, the imaginary surface including the ribs 4 obliquely blocks the flexible tube 3 from above and below.

The outer diameter of the clamping member 7.7 that clamps the rib-provided area of the flexible tube 3 is set smaller than the annular diameter of the joint between the rib and the pipe wall in the clamping state. In this case, the outer peripheral edges of the pressing members 7, 7 are arranged to coincide with the middle of the rib in the pressing state.

In the case of the above-described combination of the flexible tube 3 and the pinching members 7, 7, in the valve closed state, that is, in the pinching state by the pinching members 7, 7, the bent portion of the flexible tube 3 where the degree of deformation is large is 2, 2, etc. will not be clamped.

(Figs. 8 and 9), a pair of voids 1a, 1b are formed outside the contact area between the rib and the pipe wall and above and below the rib 4. is closed in plane.

That is, the space 1a following the upstream flow path 9 wraps around the upper part of the rib 4 and returns to the upstream flow path, and the other space 1b similarly communicates only with the downstream flow path 10, making it possible to The flow path within the flexible tube will be doubly blocked.

Further, in the pinching state, the portions located on the outside of the pinching members 7, 7 are in a free state, and no external force acts on these portions.

In addition, when the cross section of the rib 4 is composed of a master cross section 5 on the tip side and a thin wall section 6 following this, as in the illustrated embodiment, effects such as sealing effect and durability are further improved. Become something.

Furthermore, a protrusion 11.11 is protruded from the center of the clamping part of the flexible tube as shown in FIG. 10, and a clamping member T is provided.

If a fitting portion such as a through hole into which the projection fits is formed in the center of the rib 7, the pinching members 7, 7 can be formed and a concentric relationship with the rib 4 can be guaranteed.

Furthermore, rubber, soft synthetic resin, etc. are used as the material for forming the flexible tube, but various fiber materials can also be incorporated in order to increase the pressure resistance.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the conventional example, Figures 3 to 5 are explanatory diagrams of other conventional examples, of which Figure 4 is a sectional view taken along line XX, and Figure 6 is an illustration of the present invention. 7 is a plan view of the main part, FIG. 8 is a sectional view of the flexible tube in a compressed state, FIG. 9 is a Y-Y sectional view, and FIG. is a perspective view of another embodiment, and in the figure, 3...flexible tube, 4...rib, 5
...Prototype cross section, 7...Pinching member.

Claims (1)

[Claims] 1. A rib is annularly projected from the inner wall surface of the flexible tube so that the surface of the rib intersects diagonally with the center line of the flexible tube, and the flexible tube is compressed from above and below the rib surface. A pinch valve device in which the outer periphery of the pinching part of the pinching member is located inside the joint part of the rib cross section with the tube wall in the flexible tube pinching state.