JPS6323432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinch valve, and more particularly to a retainer for securing the valve body of a pinch valve using a tubular valve body of a constant length within an outer housing.

In a pinch valve, a tubular body made of an elastic material is housed in a fluid circuit, and this tubular body is pinched from the outside by a pinching means, thereby blocking a flow path by pressing the tube walls together.

Two types of pinch valves are employed as shown in FIGS. 1 and 2.

As shown in Fig. 1, the piping material itself that constitutes the fluid circuit over a long range is made of an elastic material, and a clamping means 1 is attached to any part of the piping material in the middle.
a and 1b are arranged. Such a pinch valve is used simply and for a short period of time, and there are no problems such as replacement of the valve body.

The other one is to insert the valve body 2 made of a certain length of elastic tube into the casing 3 of the valve device, or
The valve body is fixed in an exposed state, and the upstream and downstream sides of the fluid circuit are connected to both ends of the valve body, or only the upstream side is connected to one end.

The latter type of valve is used for a long period of time, so if the valve body becomes damaged, it must be replaced, but with the conventional type, the casing must be disassembled and the valve body replaced. As a result, repairs and inspections were troublesome.

In the present invention, like the latter pinch valve, a pair of pinching means is disposed inside the casing 3, a valve body 2 made of an elastic tube is inserted between these pinching means, and one pinching means is inserted between the pinching means. It is an object of the present invention to provide a pinch valve in which a means is movable toward and away from the other pinching means, and the valve body 2 can be replaced in a so-called cassette type without disassembling the casing 3.

The technical means of the present invention taken to achieve the above object are as follows: Forming a cavity 15 for accommodating the valve body 2 in the casing 3;
An annular wall surface perpendicular to the axis of the cavity 15 is formed at the upstream end of the valve body 2, and the valve body 2 is provided with a collar portion 4 at the upstream end, and a frame body 6 is fitted onto the valve body 2. , this frame body 6 is provided with an annular portion that abuts the brim portion 4 from the downstream side and an opening for operating the movable clamping means, and the outer peripheral contour of the portion other than the downstream end of the frame body 6 is formed into the above-mentioned space. A support means is provided at or near the downstream open end of the casing 3 for removably housing and fixing the frame 6 in the space 15 in the casing 3. The length of the frame 6 is set to a predetermined value so that the collar 4 of the valve body 2 is pressed against the annular wall surface at the upstream end of the cavity 15 by the annular part when the frame 6 is inserted and fixed into the cavity 15. It is set to 〓.

The above technical means of the present invention operates as follows.

To take out the valve body 2, by releasing the supporting state of the downstream end of the frame 6 by the support means, the frame and the valve body 2 inserted therein can be pulled out as one unit. Therefore, a combination of a new frame 6 and valve body 2, or a new valve body 2 assembled into the original frame 6, is inserted into the casing, and the frame is fixed within the casing by the support means. The valve body will then be fixed in place.

In this way, the valve body and the frame can be replaced as one unit by attaching and detaching the support means.

In addition, when the valve body 2 is housed in the casing 3, the collar 4 is closed to the empty space 1 by the annular portion of the frame 6.
The entire area is pressed against the annular wall surface of No. 5.

Since the present invention has the above configuration, it has the following unique effects.

By attaching and removing the support means, the valve body and frame can be replaced as one unit.
The valve body can be replaced without major disassembly of the casing, making the valve body easy to replace.

In addition, when the valve body 2 is housed in the casing 3, the collar 4 is closed to the empty space 1 by the annular portion of the frame 6.
Since the entire area is brought into pressure contact with the annular wall surface of No. 5, the sealing of the flow path connection portion of the valve body is ensured.

Hereinafter, embodiments of the present invention will be explained based on the drawings from FIG. 3 onwards.

In the first embodiment shown in FIGS. 3 to 5, the valve body 2
The collar 4 and 5 are formed at both ends, and one collar is fitted onto a ring 7 as an annular member formed at one end of the frame 6, and the other collar 5 is used as a fixing means. The valve body is assembled into the frame so as to fit onto a circular protruding rib 9 formed on the outside of the other flange 8. The one collar portion 4 is configured to be press-fitted and simultaneously pressed into a sealing surface consisting of a cylindrical curved surface portion 11 formed on the downstream side of the inflow port portion 10 of the casing 3 and an annular flat surface portion 12 perpendicular to the cylindrical curved surface portion 11. Ru. For this reason, the brim 4
The outer diameter of the ring 7 is slightly larger than the diameter of the cylindrical curved surface 11 when the ring 7 is inserted into the collar.

Also, between the flange 8 and the ring 7 is the valve body 2.
A pair of connecting rods 13, 13 adapted to the length of are provided, and these act as connecting means. The connecting rods 13, 13 are opposed to the sides of the valve body 2, and are curved so as to bulge outward at the middle in accordance with the deformation of the valve body when compressed. A connecting piece 14 is installed in the middle of the connecting rods 13, 13 to connect them, and this serves as one of the clamping means. Further, these are made of an elastic material such as synthetic resin.

Next, as shown in the figure, the above embodiment is incorporated into a casing 3 of a valve device such as a ball tap with one end open, and the space 15 provided in the casing 3 is located in the middle of the casing 3. The upper part (downstream side when the valve body is attached) becomes the enlarged cross-sectional part (the fifth
), the section below the connecting piece 14 is accommodated in the enlarged cross-sectional area, and furthermore,
An annular groove 16 is cut in the vicinity of the open lower end of the space, and the diameter of the groove is set at the flange 8 of the frame 6.
It is made to approximately match the outer diameter of.

In this embodiment, the valve body 2 is housed inside the frame body 6, and these are inserted into the cavity 15 in the casing 3 from its lower end open part, and the collar part 4 is inserted into the cylindrical shape on the outer periphery near the inlet part 10. By press-fitting into the curved surface portion 11, the upstream end of the valve body 2 is connected to the inlet portion 10 in an airtight manner around the outer periphery, and at the same time, by force-fitting the flange 8 into the annular groove 16, the valve body 2, the frame The bodies 6 are fixed together within the casing 3.

At this time, the shaft part 18 as one of the clamping means that interlocks with the ball 17 is placed opposite the connecting piece 14 across the center of the valve body 2, and the shaft part 18 moves in response to the vertical movement of the ball 17. moves forward and backward, functioning like a conventional ball tap.

In this embodiment, since the connecting piece 14 is used as one of the clamping means, compared to the case where this connecting piece is directly provided in the cavity 15 of the casing 3, the clamping means on the fixed side (in this embodiment) The end surface of the portion (corresponding to the connecting piece 14) can be positioned so as to be biased toward the axis of the valve body 2. Therefore, there is an advantage that the stroke for closing the valve of the shaft portion 18 can be set short.

Regardless of the ball tap of this embodiment, this also applies to other valve devices.

In addition, the valve body 2 used in this example was published in Japanese Patent Application Laid-open No. 57
- Valve body 2 with an unprecedented configuration using No. 9366.
A plate-shaped partition wall 20 having a through hole 19 in the center is obliquely provided on the inner circumferential surface of the tube, and this is formed integrally with the pipe wall, and the mounting position is such that the clamping means faces the outside of the partition wall 20. It is incorporated in. In this case, when the shaft portion 18 is pressed toward the connecting piece 14 side and the valve body 2 is pinched, the partition wall 20 is sandwiched between the pipe walls and is pinched, and in this pinched state, the valve body The through hole 19, which is the smallest flow path surface in the valve 2, is closed from both sides by the pipe wall, and the valve is closed. In this case, if the distance between the peripheral edge of the through hole 19 and the base end (outer peripheral end) of the partition wall 20 is set sufficiently, a valve will be formed between the pressing part 21 provided on the shaft part 18 and its outer peripheral side. The curved surface of the tube wall of the main body 2 becomes gentle, and extreme deformation of the valve main body 2 at the pinching portion can be prevented. (Fig. 6, Fig. 7) In this valve body, the through hole 19 can also be made into an elliptical shape that is long in the axial direction. The distance from the base end of the partition wall 20, that is, the rising length of the partition wall 20, can be made substantially the same in both the axial direction of the valve body 2 and the direction perpendicular to the axis, and the degree of inclination of the partition wall 20 can be adjusted. By setting appropriately,
It is also possible to make the through hole 19 approach a circular shape in the pinched state (valve closed state).

In this case, even if the central part of the valve body 2 is used in a state where it is slightly flattened in advance, the flattening causes the through hole 19 to have a shape approaching a circle, so the area of the through hole 19 is expanded. Therefore, the reduction in the effective cross section of the flow path can also be suppressed.

It goes without saying that this valve body can be used for various valves other than the ball tap as in the above embodiment. In order to improve the sealing effect when the valve body 2 is closed, a rib may be provided around the periphery of the through hole 19. Alternatively, it is possible to form an annular rib R on the end surface of the shaft portion 18 so that this rib coincides with the vicinity of the outer periphery of the through hole 19.

The first embodiment has been described in detail above, but in the second embodiment, which will be described in detail next, as shown in FIG. 8 and FIG.
It is housed in a frame 6 consisting of
In this case, the flanges 4 and 5 are protruded from both ends of the valve body 2, and each of the frame halves 6a and 6b has a semicircular outer cross section vertically divided in the axial direction, and a cross section of the inner peripheral surface. The central portion of the valve body 2 is set to have a cross-sectional shape that matches the flattened cross-section.
An annular flange 21 is provided at one end of one frame half 6a.
However, an annular flange 22 is provided at the other end of the other frame half 6b, and a flat part 23 facing toward the other frame half 6a is provided at the middle inner surface of the one frame half 6b. A pressing disk 2 is provided in the middle of the other frame half 6a and is opposed to the flat portion.
4 is provided, and when it is assembled into the frame 6 of the valve body 2, the valve body 2
A protrusion 26 protruding in the middle of the pressing disk 2
4 into the recessed fitting part 27 in the center of the pressing disk 2.
4 is designed to move up and down integrally with the pipe wall at the center of the valve body 2. Further, a protrusion 28 is provided at the center of the outer surface of the pressing disk 24, and is exposed in a shaft hole 29 formed at the center of the frame half 6a.

In the second embodiment, one collar 5 of the valve body 2 is inserted from inside the flange 21 of one frame half 6a and brought into contact with the outer end surface thereof, and the other collar 4 is similarly inserted. Flange 22 of the other frame half 6b
When these frame halves 6a and 6b are put together with the pressing disk 24 temporarily attached to the protrusion 26 of the valve body 2, as shown in FIG. 9, the frame 6, the valve body 2, and the pressing disk It becomes a unit that integrates 24 units.

In this embodiment, the outer shape of the valve unit has a circular cross section, or the outer circumferential ribs 40, 40, etc. are housed in an outer shape located within a certain circular cross section. When used as a valve device such as a ball tap, as shown in Figure 10,
It is only necessary to form the hollow space 15 below the inflow port 10 on the inner peripheral surface of a cylindrical shape, and to form a threaded part 30 on the outer periphery of the lower end open part of the casing 3, and to combine a cap nut 31 to be screwed therewith. That's fine.

According to this combination, when the valve unit is inserted into the cavity and tightened with the cap nut 31, the valve body 2 is inserted into the proper position, and in this position, the shaft portion 1
8 and the protrusion 28 of the pressing disk 24 face each other, and in conjunction with the movement of the ball 17, the pressing disk 24 presses and opens the middle of the valve body 2.
In this embodiment, the plane part 23 and the pressing disk 2
Each of 4 functions as a clamping means.

The second embodiment has the same effects as the first embodiment, but in addition, the valve unit also includes a pair of clamping means, so the cross section of the frame 6 It can be mounted on any casing that has a cavity with a uniform cross section that matches the external shape.
Therefore, the space 1 which becomes the valve housing part in the casing 3
In addition to simplifying the shape of the valve unit 5, if the shape and dimensions of the valve unit are standardized and multiple types are prepared in advance, the shape of the space and the tip of the shaft portion 18 can be adjusted to match these standardized valve units. By adapting it to the unit, it can be used as is in all types of valve devices.

Next, in the case of this second embodiment, the frame halves 6a, 6
As shown in Figs. 11 and 12, the flanges 21 and 22 are constructed so that they can be integrated with each other by means of screwing, fitting, etc. at the center dividing part, and the flanges 21 and 22 are set to have a sufficient wall thickness so that the outer periphery of the flange By attaching the connection screw portion 32 to the frame body 6 and the operating shaft 33 to the shaft hole 29 of one frame half body 6a, this frame body 6 will function as a casing as it is.

In this case, if a band 35 is connected to the cylindrical body 34 that coincides with the shaft hole 28, this band is wound around the center of the frame 6, and both ends are connected by screws or other means, the cylindrical body 34 functions as a guide for the actuating shaft 33, and when the actuating shaft 33 is screwed into the cylindrical body, it becomes a valve device that opens and closes by rotation of the actuating shaft 33.

Further, as shown by the two-dot chain line in FIG. 11, a screw hole is provided in the upper surface of one frame half 6a near the shaft hole 29, and the operating shaft holding means such as the cylinder 34 is screwed into this hole. However, the frame body 6 can be used as a casing as is, as described above. Furthermore, in order to use the frame half as a casing, it is also conceivable to construct a cylinder or the like integrally with the frame half 6a.

In this second embodiment, the valve body 2 is inserted into the casing 3 using only one frame half 6b, and the frame half 6 is screwed with the cap nut 31.
b may be fixed within the space 15. In this case, the frame half 6b functions as a frame, and the combination of the cap nut 31 and the semicircular flange 36 at the lower end functions as a fixing means by screwing. Furthermore, in the case of this second embodiment, if the operating stroke of the shaft portion 18 is sufficient, the pressing disk 24 is not necessarily required.

Furthermore, in both the first and second embodiments, in the case of a valve device such as a ball tap, which is provided at the end of a fluid circuit, the structure may be such that the flange portion 5 is not provided at the downstream end of the valve body 2. The effects of the present invention can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional example, Figure 3 is an explanatory diagram of the first embodiment of the present invention, Figure 4 is an exploded view of its main parts, Figure 5 is a sectional view taken along line XX, Figure 6 is a Y-Y sectional view of the main part in the valve closed state, and Figure 7 is a Z-sectional view in the same state.
-Z sectional view, FIG. 8 is an exploded view of the frame 6 of the second embodiment, FIG. 9 is a sectional perspective view of the main part of the second embodiment, FIG. 10 is a sectional view of its installed state, and FIG. The figure is the second
An explanatory diagram of another usage example of the frame body 6 of the embodiment, FIG. 12 is a sectional view of the main parts thereof, and in the figure 2... Valve body, 3... Casing, 4... Flam part, 6... Frame body, 7...ring, 8...flange, 13...connecting rod, 15...blank space.

Claims (1)

[Claims] 1. A pair of clamping means are disposed inside the casing 3, and a valve body 2 made of an elastic tube is arranged between the clamping means.
In the pinch valve in which one pinching means can be freely moved toward and away from the other pinching means by inserting a
At the same time, an annular wall surface perpendicular to the axis of the hollow space 15 is formed at the upstream end of the space 15, and the valve body 2 is provided with the collar 4 at the upstream end. The frame body 6 is provided with an annular portion that abuts the collar portion 4 from the downstream side and an opening for operating the movable clamping means.
The outer peripheral contour of the portion other than the downstream end of the casing 3 is set to a size that can be removably accommodated in the cavity 15, and support means for removably housing and fixing the frame 6 in the cavity 15 in the casing 3 is provided. It is provided at or near the downstream open end of the casing 3, and with the frame 6 inserted and fixed into the cavity 15, the collar part 4 of the valve body 2 is pressed against the annular wall surface at the upstream end of the cavity 15 by the annular part. A pinch valve in which the length of the frame body 6 is set to a predetermined value so that the length of the frame body 6 is set to a specified value. 2. The support means is a combination of a groove 16 formed on the inner periphery of the downstream end of the cavity 15 and a flange 8 formed on the downstream end of the frame 6 and removably fitted into and engaged with the groove 16. A pinch valve according to claim 1. 3. The support means is a cap nut 31 screwed onto the downstream end of the cavity 15 of the casing 3, and the frame body 6 is housed in the cavity 15 in a state where it is prevented from coming out when the cap nut is screwed. A pinch valve according to claim 1.