JPH0627550B2 - Fluid stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a case where a fluid pressure in a fluid passage for flowing a fluid such as air, water, oil, or a chemical solution is equal to or higher than or equal to a predetermined pressure. The present invention relates to a simple fluid stopper that temporarily stops the flow of fluid or limits the flow rate.

[Prior Art] Conventionally, as means for stopping the flow of fluid or limiting the flow rate, a valve is usually installed in the fluid passage, and for example, a signal from a pressure detecting means for detecting the pressure of the fluid. It is common to control this valve by

[Problems to be Solved by the Invention] In such a case, a fairly large-scale equipment such as a pressure detecting means for detecting the pressure of the fluid, a valve installed in the fluid passage, and a control device for controlling the valve is provided. There is a problem that it is necessary, the cost is high, and the mounting place is restricted.

It is an object of the present invention to provide a fluid stopper that automatically stops the flow of fluid and limits the flow rate with an extremely simple configuration.

[Means for Solving the Problems] In order to achieve the above object, in a fluid stopper according to the present invention, an elastic body that expands and contracts by a pressure of a fluid, and one end of the elastic body is connected, A tube body having a bent portion so that it can be bent easily, It is characterized by controlling.

[Operation] In the fluid stopper having the above-mentioned configuration, the expandable body expands or contracts due to the pressure of the fluid, the portion of the tubular body with the crease bends due to the operation, and the flow of the fluid stops depending on the degree of the bending. Or, limit the flow rate.

[Examples] The present invention will be described in detail based on the illustrated examples.

FIGS. 1 and 2 show an embodiment of a fluid stopper according to the present invention. FIG. 1 shows a state in which a fluid is flowing, and FIG. 2 shows a state in which the fluid is stopped or the flow rate is limited. It shows the state. In the drawings, 1 is a cylindrical bellows that expands or contracts according to the pressure of an internal fluid, and 2 is a flexible tube connected to the bellows 1. In order to make it easy to bend the tube 2 in advance, as shown in FIG. 3, there are provided two places where creases are formed, that is, bent portions 3 and 3.

The bellows 1 and the tube 2 may be integrally formed as shown in FIG. 1, or may be separately formed as shown in FIG. These materials are different depending on the use, but generally, synthetic resin, rubber, metal or the like having good elasticity, durability and temperature stability, or a combination thereof is used.

1 and 2, when the bellows 1 and the tube 2 are fixed to the frame 4 and the like, respectively, the bellows 1 is in a contracted state in the normal state shown in FIG. The fluid is flowing in the bellows 1 and the tube 2 because it is not bent to the extent that it obstructs the flow of the fluid. However, when the pressure of the internal fluid exceeds a predetermined pressure, as shown in FIG. 2, the bellows 1 expands, so that the bent portion 3 of the tube 2 bends extremely and the degree of the bending causes the internal fluid to flow completely. Or the flow rate is limited.

FIG. 5 exemplifies a cross section in a state where the bending portion 3 is bent. (A) shows a case where only the central portion has a crease, and a gap 2a is formed on both sides even when the bending portion is extremely bent. So
It is not possible to completely stop the flow of fluid. But,
As shown in (b), it can be closed completely if it has a crease. As described above, the bending portion 3 can be in a completely closed state or a half-opened state to limit the flow rate depending on the degree of bending and how the creases are formed. Just select it. Further, in the fluid passage, the bellows 1 may be arranged upstream and the tube 2 may be arranged downstream, or vice versa. When the fluid flows in from the tube 2 side, the bellows 1 serves as a constant pressure source.

FIG. 6 shows a case where the bellows 1 and the tube 2 are housed inside the housing 5. When the internal pressure of the bellows 1 becomes higher than a predetermined pressure inside the housing 5 around the bellows 1, the bent portion 3 closes. It will not be supplied to the tube 2 side.

Further, FIG. 7 shows an example in which the tube 2 is housed inside the bellows 1 whose one end is fixed. In this case, the housing 5
When the internal pressure of the bellows 1 becomes lower than the internal pressure of 1, the bellows 1 contracts, and as a result, the bent portion 3 closes and the fluid is not supplied to the tube 2 side.

In the above-described embodiment, the case where the bent portion 3 is provided in the tube 2 at two locations is shown, but the number is not necessarily limited to two locations, and for example, only one location may be provided as shown in FIG. 8th
In the figure, (a) shows a state in which the tube 2 is not bent, and (b) shows a state in which the bellows 1 expands and the bent portion 3 bends to hinder the flow of fluid.

Further, FIG. 9 shows an example in which a tube 2 having a bent portion 3 is connected between two bellows 1a and 1b and the bent portion 3 is bent by the expansion or contraction operation of the bellows 1a and 1b.

In order to facilitate the bending of the bent portion 3, for example, as shown in FIG. 10, only the bent portion 3 can be thinned or thinned, and the bending direction can be made flexible. As shown in FIG. 11, it is also possible to make the bending directions of the plurality of bent portions 3 different. Further, as shown in FIG. 12, it is also effective to fit a bending assisting member 6 for promoting bending as shown in FIG. 13 on the outside or inside of the tube 2. The bending assisting member 6 has a short tube portion 6a.
Are connected by a thin skin-shaped connecting portion 6b, and the central portion of the connecting portion 6b is bent. A fold line 6c may be provided in the central portion of the connecting portion 6b as necessary.

FIG. 14 shows an example in which a spring 7 is provided in a direction that prevents expansion of the bellows 1 and the bellows 1 expands and the bent portion 3 does not close unless the pressure inside the bellows 1 becomes considerably high. On the contrary, a spring may be used in a direction that promotes expansion of the bellows 1 on the contrary.

The embodiment shown in FIG. 15 shows an example in which a tube 2 is attached to one side surface of a bellows 1 that expands and contracts in a fan shape, and a bent portion 3 thereof is bent according to the opening degree of the bellows 1.
Of course, one end of the tube 2 communicates with the inside of the bellows 1. Also in this case, as shown by the arrow S, a spring or the like can be provided in a direction in which expansion of the bellows 1 is hindered.

FIG. 16 shows that a tube 2 is attached to the inside of a bellows 1 having a similar fan shape, and the tube 2 is compressed when the bellows 1 contracts.
The example in which the bent portion 3 is bent is shown.

FIG. 17 shows that the bent portion 3 of the tube 2 is housed inside the cylindrical bellows 1, and the free end of the bellows 1 is fixed to the tube 2, and a part of the tube 2 communicates with the inside of the bellows 1. And the spring 8 in the direction in which the bellows 1 contracts.
An example in which is provided is shown. In this case, the bellows 1 is normally pushed by the spring 8 and contracts, and the bent portion 3 of the tube 2 is closed to stop the flow of the fluid or limit the flow rate, but the internal pressure of the bellows 1 is elastic. When the bellows 1 expands by overcoming, the bent portion 3 is opened and the fluid is circulated.

Further, in order to facilitate the bending of the bent portion 3, as shown in FIG. 18, the tube 2 can be freely moved by providing a knuckle portion 9 having a structure that easily bends in places on the tube 2.

In the embodiments, the bellows has been described as an example of the elastic body, but a diaphragm or the like may be used.

[Effects of the Invention] As described above, in the fluid stopper according to the present invention, the expandable body expands or contracts when the pressure of the fluid becomes equal to or higher than or equal to the predetermined pressure in the fluid passage, and the expansion or contraction operation causes the pipe to move. There is an advantage that the flow of the fluid can be automatically stopped or the flow rate can be limited by bending the bent portion of the body, and the flow of the fluid can be efficiently controlled by an extremely simple means.

[Brief description of drawings]

The drawings show an embodiment of a fluid stopper according to the present invention.
The figure is a cross-sectional view of a normal state, FIG. 2 is a cross-sectional view of an operating state, FIG. 3 is an enlarged cross-sectional view of a bent portion, FIG. 4 is a cross-sectional view of another embodiment, and FIG. 5 is a bent portion. 6 to 9 are sectional views of still another embodiment, FIGS. 10 to 12 are perspective views of a bent portion, FIG. 13 is a perspective view of a bending assisting member, and FIGS. FIG. 18 is a sectional view of another embodiment. Reference numeral 1 is a bellows, 2 is a tube, 3 is a bent portion, 4 is a frame, 5 is a housing, 6 is a bending assisting member, 7 and 8 are springs, and 9 is a node portion.

Claims (1)

[Claims] 1. A fluid body comprising an expandable / contractible body that expands and contracts by pressure of a fluid, and a tube body having one end connected to the expandable body and a portion having a crease so as to be easily bent halfway. A fluid stopper for controlling the flow of fluid by bending the portion of the tube body having a crease by the expansion / contraction operation of the expandable / contractible body by the pressure.