JPS5949458B2 - Valve using flexible tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Subject of the Invention) The present invention relates to a valve using a flexible tube, and in particular changes the pressure relationship between the inner and outer peripheries of the flexible tube and bends the flexible tube to control the flow of fluid. Concerning things that open and close passages.

(Prior Art) Japanese Patent Publication No. 48-35965 describes a fluid flow valve using a flexible pipe.

Attach the lid member to the cylindrical main body member with bolts,
Casing.

Place the core cage inside the casing.

The core cage has a barrier in its central portion, a sealing surface on its outer periphery, and slots in the peripheral walls on either side of the central barrier.

The inner circumferential wall of the casing and the outer circumferential wall of the core cage are separated from each other, and a cylindrical flexible tube is arranged in that space.

The flexible tube has seven flanges at each end, each clamped between the casing and the core cage.

At this time, the inside of the flexible tube contacts the sealing surface on the outer periphery of the central portion of the core cage.

A control fluid port is provided in the casing.

Control fluid is introduced into or out of the space outside the flexible tube through this port.

One side or inlet side of the core cage barrier is connected to a source of high pressure controlled fluid, and the other side or outlet side is connected to a source of low pressure controlled fluid.

Therefore, when the pressure of the fluid around the outer circumference of the flexible tube is reduced, the inlet side portion first bulges outward, gradually expands toward the outlet side, and eventually separates from the sealing surface.

The controlled fluid then exits the core cage through the inlet slot, overcomes the barrier, enters the core cage again through the exit slot, and flows to the destination.

As the pressure of the control fluid is increased, the flexible tube is compressed inwardly and pressed against the outer periphery of the core cage, thereby sealingly abutting the sealing surface and stopping the flow of the controlled fluid.

In this fluid flow valve, both ends of the flexible tube are sandwiched and fixed between the casing and the core cage.

Therefore, when a flexible tube expands outward, the expansion is covered only by the elongation of the tube opening, which generates a large tensile stress and thus has a short lifespan.

(Technical Problem) A technical problem of the present invention is to provide a flexible tube that is easy to bend, has low tensile stress, and has a long service life.

(Structure and operation) The structure of the valve using a flexible tube according to the present invention is as follows.

The internal water body has a substantially cylindrical wall. A partition wall divides the inside of the pipe into an inlet passage and an outlet passage.

A hole is provided in each tube wall of both the inlet and outlet passages to communicate between the inside and outside of the tube.

A flexible tube is fitted to the outer periphery of the internal water body so as to cover the hole, and the end on the inlet side is fixed, but the end on the outlet side is left unfixed and free.

A sealed pressure chamber is formed around the outer periphery of the flexible tube by attaching nine main bodies.

Pressurized fluid is introduced into the pressure chamber through the first passage means.

The pressurized fluid may be from a control fluid source;
The controlled fluid may be on the inlet passage side.

The fluid in the pressure chamber is vented to the outside through the second passage means.

The function of this valve is as follows.

The pressure within the pressure chamber increases when pressurized fluid is introduced through the first passage, and is decreased when pressurized fluid is discharged through the second passage.

Therefore, the flexible tube is pressed against the internal body of water when the pressure in the pressure chamber increases, so that fluid in the inlet passage cannot flow to the outlet passage.

When the pressure in the pressure chamber becomes low, the pressure of the controlled fluid in the inlet passage causes it to expand and move away from the internal water body, so the fluid in the inlet passage passes through the hole, exits the pipe, crosses the partition wall, and passes through the hole again. enters the pipe and flows out into the outlet passage.

At this time, the flexible tube is bent while being attracted to the hole on the outlet side.

In the flexible tube of the present invention, the inlet passage side is fixed, but the outlet passage side is not fixed, so that when it is bent, the free end can move toward the inlet passage side along the tube of the internal water body.

Therefore, it is easy to bend and the tensile stress is small, resulting in a long life.

The first passage means may be a flexible tube with pores formed therein so as to introduce the fluid in the inlet passage into the pressure chamber.

Valve means for controlling the amount of fluid passing can be attached to one or both of the first passage means and the second passage means.

Since the pressure within the pressure chamber can be controlled by operating this valve means, a valve using a flexible pipe can be operated.

For example, if this valve means is a float valve, a level control valve can be obtained.

(Example) The illustrated embodiment will be described in detail.

In the figure, the upper half of the dashed-dotted line shows the valve open state, and the lower half shows the valve closed state.

The internal water body 1 consists of a substantially cylindrical tube wall 1a and a partition wall 1b that partitions the inside of the tube wall 1a into an inlet passage 2 and an outlet passage 3.

The tube wall 1a is provided with a plurality of holes 4 penetrating in the radial direction so that both the input and output passages 2 and 3 communicate with the outside.

A flexible tube 5 is fitted to the outside of the internal water body 1 so as to cover the hole 4.

The flexible tube 5 is made of a material such as synthetic rubber or tetrafluoroethylene resin that can be bent from the shape shown in the lower half of the figure to the shape shown in the upper half of the figure.

One end of the flexible tube 5 is provided with a collar portion 5a bent outward, and the other end is left in a straight shape.

The main body 6 has a substantially cylindrical shape, and one end is screwed into the collar 1c of the internal water body 1 with the collar 5a of the flexible tube 5 interposed therebetween.

A pressure chamber 7 is formed between the flexible tube 5 and the main body 6.

The pressure chamber γ is sealed from the outside by an O-ring 8 interposed between the collar 1d of the main body 1 and the collar 6a of the nine main bodies 6.

The first passage means is formed by a pore 9 provided in the flexible tube 5, which communicates the inlet passage 2 with the pressure chamber 3.

A hole 10 provided in the main body 6 with a second passage means. A conduit 11 connected to the hole 10 and a valve means 12 disposed in the middle of the conduit 11
to form.

The conduit 11 communicates with an external low pressure point or the like.

The valve means 12 may be a manual valve, a solenoid valve, a pneumatically operated valve, etc., and operates according to arbitrary instructions to relieve the pressure in the pressure chamber 7.

The operation of the above embodiment will be explained.

When the valve means 12 is closed, the fluid on the inlet side flows into the pressure chamber 7 through the holes 4 and the pores 9, so that the pressure becomes the same as that on the inlet side.

The flexible tube 5 comes into close contact with the internal water body 1 due to its elastic force and the pressure difference between the pressure chamber and the outlet, and blocks the inlet passage 2 and the outlet passage 3 (the state shown in the lower half of the figure).

Since the flexible tube 5 is made of a material such as synthetic rubber or polytetrafluoroethylene resin, it is highly airtightly sealed and does not leak fluid.

When the valve means 12 is opened, the fluid in the pressure chamber 7 flows through the hole 10.
, through conduit 11 and valve means 12 to the outside, resulting in a pressure drop.

The flexible tube 5 is bent with one end drawn toward the outlet side as shown in the figure due to the pressure difference between the inlet side and the pressure chamber.

At this time, the free end moves toward the inlet.

Therefore, the flexible tube 5 is easily bent and has low tensile stress.

Since a space is formed between the hole 4 and the inner water body 1 and the flexible tube 5, the fluid in the inlet passage 2 flows through the hole 4 and the inner water body 1 on the inlet side.
and the flexible tube 50, and flows out into the outlet passage 3 through the hole 4 on the outlet side (the state shown in the upper half of the figure).

In this embodiment, the opening and closing operations described above are performed in accordance with the opening and closing of the valve means 12.

The valve of this embodiment is made of extremely few parts, including the inner and outer bodies 1 and 6 and the flexible tube 5, and has a simple structure.

The holes 4 can be provided over a wide area of the tube wall 1a of the main body 1, and since the flexible tube 5 opens and closes a plurality of holes 4 at once, a large amount of fluid can be controlled.

The flexible tube 5 bends according to the pressure relationship acting on its inner and outer circumferences, and is not subjected to any frictional resistance during that time, so it operates reliably.

Further, since the bending action of the flexible tube 5 is utilized, the above-mentioned operation is gentle and does not cause water hammer.

There is local suppression in the part of the flexible tube 5 corresponding to the hole 4 on the inlet side, and local suction in the part corresponding to the hole 4 on the outlet side; Locally bends in some parts.

This bending becomes smaller as the hole 4 is made smaller.

For example, if part of the tube wall 1a is formed of a porous screen-like member, the durability of the flexible tube 5 is improved.

The flexible tube 5 bends according to the pressure within the pressure chamber γ, and the first passage means (hole 9) and the second passage means (hole 10)
, the conduit 11, and the valve means 12-), the pressure in the pressure chamber 7 can be controlled by adjusting the amount of fluid passing through one or both of the valve means 12-).

Therefore, as in this embodiment, the first passage means is kept open and the second passage means is kept open.
The pressure in the pressure chamber 7 can be controlled not only by opening and closing the passage means, but also by opening and closing the first passage means, keeping the second passage means normally open, and opening and closing both the first and second passage means. .

The first and second passage means can be opened and closed by all common valves such as manual valves, electrically operated valves, and pneumatically operated valves.

In addition, a large capacity self-blade operating valve can be easily manufactured by simply using a small-sized self-blade operating valve made of level control pulp or the like.

(Specific Effect) Since the pressure inside the pressure chamber is higher than that on the outlet side, the outlet side portion of the flexible tube is always pressed against the tube wall.

Therefore, when it expands outward, it is pulled toward the center, but when it contracts, it is difficult to return to its original state.

For this reason, when not only the inlet end but also the outlet end of the flexible tube is fixed as in the past, a considerably large tensile stress is generated at the outlet end of the flexible tube, and the tube This part is prone to damage as it slides on the wall surface and wears out.

In the case of the present invention, since the outlet end of the flexible tube is not fixed, it will not be forcibly pulled back when contracted.

Therefore, no tensile stress remains and there is little wear.

In the case of the present invention, even if the pressure in the pressure chamber is suddenly increased or decreased, the fluid in the pressure chamber flows out to the outlet side through between the free end of the flexible tube and the tube wall of the internal water body. Or, the fluid on the outlet side flows into the pressure chamber, so the valve opens and closes slowly.

Therefore, it is less likely to cause water hammer.

Since the flexible tube of the present invention only has one end fixed, it requires fewer parts and has a simpler structure than a flexible tube that has both ends fixed.

[Brief explanation of drawings]

The figure shows a sectional view of a valve according to an embodiment of the invention. 1... Internal water body, 1a... Pipe wall, 1b... Partition wall, 2
... Entrance passage, 3... Outlet passage, 4... Hole, 5.
...Flexible tube, 6...Outer body, 7...Pressure chamber, 9...
... Pore, 10... Hole, 11... Conduit, 12...
Valve means.

Claims (1)

[Scope of Claims] 1. The inner body has a substantially cylindrical tube wall, the inside of the tube is partitioned into an inlet passage and an outlet passage by a partition wall, and holes are provided in the tube walls of each of the inlet and outlet passages to communicate the inside and outside of the tube. A flexible tube is fitted around the outer circumference of the inner body so as to cover the hole, the inlet end is fixed but the outlet end is left unfixed, and the outer car body is attached. forming a sealed pressure chamber around the outer periphery of the flexible tube, introducing pressurized fluid into the pressure chamber through the first passage means;
The fluid in the pressure chamber is discharged to the outside through the second passage means, and due to the pressure relationship of the fluid acting on the inner and outer peripheries, the portion near the free end of the flexible tube is bent while being attracted to the hole on the outlet side. A valve using a flexible pipe, characterized in that it is configured to communicate or block an outlet passage. 2. The flexible tube according to claim 1, wherein the first passage means is a flexible tube formed with a pore so as to introduce the fluid in the inlet passage into the pressure chamber. A valve using a pipe. 3. A valve using a flexible pipe according to claim 1, characterized in that one or both of the first passage means and the second passage means is provided with valve means for controlling the amount of fluid passing through.