JPS6220424B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device, particularly a valve device of the type in which a cylindrical member made of an elastic material such as rubber or a flexible material constitutes a flow path, and the cylindrical member itself blocks the flow path. This relates to a valve device.

An example of the above-mentioned type of valve is a pinch valve, which blocks a flow path by pinching a part of the elastic tube 1 as a cylindrical member from the outside, and is required to completely block the flow path. The clamping force cannot be made too small. For example, when used in an automatic water supply device as shown in Fig. 1, the float 3 is set at a water level of 2.
The rod head 31 connected to the float is lifted up by the buoyancy of the float, and when the water level reaches a specified height, the rod head 31 is raised by the buoyancy of the float. The rod head 31 presses and deforms the elastic tube 1 in the diametrical direction to block the flow path 4.

In the case of the above-mentioned conventional device, the external force for blocking the flow path 4, ie, the pressing force of the rod head 31, must be set to be greater than the sum of the pressures applied to the tube wall. Therefore, the pressing force of the rod head 31 cannot be set below the sum of the pressures.

This is because the force necessary to block the flow path 4 is entirely dependent on the acting force outside the flow path.

An object of the present invention is to enable fluid pressure within a flow path to be used as a flow path blocking force in order to close the flow path with a small force.

The technical means of the present invention for solving the above problems is as follows: ``The inside of a cylindrical body with both ends open is partitioned by an elastic partition wall 33 parallel to the axis to form a main flow path 19 and a pilot flow path 18. blocks the downstream side thereof, and the pilot flow path 18 includes:
A pilot hole 16 communicating with the atmosphere or the downstream part of the main flow path 19 is provided, and an opening/closing means for opening and closing the pilot hole 16 from the outside is opposed to the pilot hole 16.
That's true.

The above technical means works as follows.

The upstream ends of the main flow path 19 and the pilot flow path 18, which are formed by partitioning the inside of the cylinder parallel to the axis, are both open to the upstream flow path. Therefore, the fluid flowing from the upstream flow path is distributed to the main flow path 19 and the pilot flow path 18.

In this state, if the pilot hole 16 provided in the pilot flow path 18 is left open, the fluid flowing into the pilot flow path 18 will flow through the pilot hole 1.
6 into the main flow path 19, or
It will be released into the atmosphere through the pilot hole 16, and the main flow path 19 and the pilot flow path 1
A fluid flow exists in both flow paths of No.8.

Therefore, almost no pressure difference occurs between the main flow path 19 and the pilot flow path 18, and the elastic partition walls that partition the flow paths 18 and 19 are maintained in their initial state, and the fluid flows through the main flow path. 19 and the pilot flow path 18 to the downstream side.

Next, in order to shut off the flow path, it is sufficient to close the pilot hole using an opening/closing means, and as a result, the flow in the pilot flow path is stopped and the pressure inside the main flow path, which is still in a flowing state, is lowered. Internal pressure increases. As a result, the elastic partition wall that partitions both flow paths is displaced toward the main flow path where the pressure is lower according to the pressure difference, and eventually the elastic partition wall closes the main flow path and blocks the entire flow path.

Next, in order to open the entire flow path, it is sufficient to open the pilot hole, and when the pilot hole is opened, a flow occurs in the pilot flow path and the pressure inside the pilot flow path decreases, while the main flow path is closed. Since there is no flow of fluid inside the partition, the pressure in that part is high, and this reverse pressure difference causes the elastic partition wall to return to its initial state and open the entire flow path.

Therefore, since the main flow path is closed by the action of fluid pressure within the flow path, the flow path can be shut off with a small force sufficient to open and close the pilot hole.

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

When used in a type that opens and closes a large capacity circuit, the flow path can be shut off simply by opening and closing the pilot hole, so the amount of operation of the operating section is smaller than when the flow path is directly opened and closed. For this reason, even when an electric drive device such as an electromagnetic solenoid is used as the operation means for the operation part, the amount of operation of the output shaft is small, and furthermore, since the opening and closing force of the pilot valve is small, the electric drive This has the advantage that the device can be made smaller.

Furthermore, when the above-mentioned cylindrical valve is used in an automatic water supply device, it is only necessary to open and close the pilot hole to shut off the flow path, so the float can be made smaller and no link mechanism is required between the float and the rod head. Become.

Next, embodiments of the present invention described above will be described with reference to the drawings.

A first embodiment of the present invention is shown in FIGS. 2 to 4. In FIG. It is formed by double tubes. The inner tube 14 forming the main flow path 19 is a pilot flow path 18 which will be described later.
and the main flow path 19. The inner tube 14 has a thick wall at the upstream end to increase the deformation resistance of that part, and a thin wall at the other part so that it can be easily deformed. Main flow path 19
A pilot hole 16 is bored for communicating the pilot flow path 18 with the pilot hole 16. On the other hand, the outer tube 17 is formed one size larger than the inner tube 14 so as to form a pilot flow path 18 between the outer tube 17 and the inner tube 14.

The above-mentioned cylindrical valve is housed in a holder 5, as shown in FIG. 3, for example, and used in an automatic water supply device.
A rod 32 is installed through the lower part of the holder 5 so as to be able to rise and fall freely, and a rod head 31 at the tip thereof faces the pilot hole 16 from the outside of the outer tube 17. On the other hand, a float 3 located in the tank 21 is fixed to the lower part of the rod 32, and these serve as opening/closing means.

When fluid flows into the flow path from upstream as shown by the arrow in FIG. Water is discharged to raise the water level 2 in the tank 21. On the other hand, the fluid passing through the pilot channel 18 joins the main channel 19 again through the pilot hole 16 and is similarly discharged into the tank 21. When the water level 2 in the tank 21 rises, the float 3 rises due to its buoyancy, which causes the rod 32 to rise and the rod head 31 to close the pilot hole 16. When the pilot hole 16 is blocked, the flow in the pilot channel 18 stops and the pressure in the pilot channel 18 increases, but the flow continues in the main channel 19, so the fluid pressure up to that point is maintained. As a result, a pressure difference is created between the pilot flow path 18 and the main flow path 19, and the inner tube 14 is displaced into a flattened state in the thin wall 10 excluding the thick wall 15, and eventually the main flow path 19 will be closed. (FIG. 4) When the water level 2 becomes lower and the buoyant force acting on the float 3 decreases, the float 3 descends due to its own weight, and the rod 32 also descends accordingly, causing the rod head 31 to open the pilot hole 16. When the pilot hole 16 is opened, the fluid in the pilot flow path 18 is discharged to the downstream side through the pilot hole 16, a flow is generated again in the pilot flow path 18, and the pressure in the flow path decreases. On the other hand, since the fluid in the main flow path 19 remains in a stopped state, the pressure within the flow path does not decrease, and therefore the inner tube 14 is caused by the pressure difference between the pilot flow path 18 and the main flow path 19. Then, the main flow path 19 gradually expands outward from the upstream side to the downstream side, and the main flow path 19 is opened again. In this case, since the cylindrical valve has a double pipe structure, there is no possibility of external leakage of fluid.

A second embodiment of the present invention is shown in FIG. 5, in which an elastic tube 1 is formed into a main flow path 19 and a pilot flow path 18 which are vertically divided by a thin elastic wall 33. 1 pilot hole in the low wall of 18
6 is perforated.

In the case of this second embodiment, when the pilot hole 16 is opened and closed, the elastic tube 1 placed in the flow connects the pilot flow path 18 and the main flow path 19 as in the first embodiment described above. A pressure difference is generated between the two, and the elastic partition wall 33 is vertically displaced by the action of this pressure difference, thereby opening and closing the main channel 19.

FIG. 6 shows a sectional view of a main part of a third embodiment of the present invention, which is different from the first embodiment in that a rod head 31 can directly fit into and close the pilot hole 16.

In the case of this third embodiment, the pilot hole 16
This has the advantage that opening and closing can be performed reliably.

FIG. 7 shows a sectional view of the main part of the fourth embodiment of the present invention, which is the same as that of the first embodiment in which the pilot hole 16 is provided in the front face of the tip of the elastic tube 1. It works the same way.

In the above embodiments, the buoyancy of the float 3 is used as a means to close the pilot hole, but the rod 32 may also be controlled remotely using an electromagnetic coil or other means. Furthermore, it is also possible to manually open and close the pilot hole, and it can be used not only as an automatic water supply device but also as any other valve device.

Furthermore, in all of the above embodiments, in order to increase the deformation resistance of the upstream end 12 of the main flow path 19, this portion is made thick, but this upstream end 12 is fixed to the upstream end of the outer pipe 17. configurations can also be adopted.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the conventional example, and FIG. 2 is an explanatory diagram of the first example of the present invention.
A cross-sectional perspective view of the cylindrical valve used in the example, FIGS. 3 and 4 are illustrations for explaining its use, and FIG.
6 is a cross-sectional view of the main parts of the third embodiment of the present invention, and FIG. 7 is a cross-sectional view of the main parts of the fourth embodiment of the present invention. In the figure, 16...pilot hole , 18...pilot flow path, 19...main flow path.

Claims (1)

[Claims] 1 Elastic partition wall 3 parallel to the axis inside the cylinder with both ends open
The main flow path 19 and the pilot flow path 1 are divided into
8, the pilot flow path 18 closes its downstream side, and the pilot flow path 18 is provided with a pilot hole 16 that communicates with the atmosphere or the downstream part of the main flow path 19. is a valve device with opposing opening/closing means for opening and closing it from the outside.