JPH0617063Y2 - Fluid shutoff valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fluid cutoff valve used in a rocket-utilizing weightless vacuum experimental apparatus and the like.

[Prior Art] Launched by a rocket, vacuum experiments were conducted under zero gravity,
There is an experimental device that is collected at sea after the experiment. In this type of device, the vacuum chamber is evacuated to a vacuum by a vacuum exhaust device at the time of launch, and after launch, in order to maintain the degree of vacuum in the experimental device, the connection port with the exhaust device is closed with a shutoff valve. There is a need.

As shown in FIG. 2, such a shutoff valve is configured to press the poppet 30 with a strong spring 31 to close the connection port 32 with the outside.

The poppet 30 is attached to a piston rod 41 of a fluid actuator 40 that transmits the pressure of the working fluid in one direction as an actuating force to the outside. When the pressure of the fluid actuator 40 is not applied to the poppet 30, As described above, the closed state is maintained by the spring 31. When connecting the connection port 32 to an external device,
The working fluid is guided into the cylinder 42 through the solenoid valve 35, the piston 43 is moved to the stop position S, the poppet 31 is pulled up against the elastic force of the spring 31, and the connection port 32 communicates with the flow path of the external device. I am letting you.

[Problems to be Solved by the Invention] The gravity-free vacuum experimental apparatus incorporating the shut-off valve having the above-mentioned structure is recovered by landing on the sea after the completion of the experiment in outer space. In order to completely maintain the closed state of the poppet against the seawater pressure received during landing, the blocking force of the above spring must be set to be fairly strong, so the structure must be enlarged. However, as a result of the increase in the overall weight, there is a problem that it is not preferable to be incorporated into a flying body or the like, which is desired to be as lightweight as possible.

Therefore, an object of the present invention is to provide a fluid cutoff valve that can be made small and lightweight and has a sufficiently large closing force.

[Means for Solving the Problems] The present invention adopts the following configurations in order to solve the above problems.

That is, the fluid cutoff valve according to the present invention supplies the working fluid into the cylinder through the directional control valve to move the piston forward and backward, and the valve body attached to the piston rod cuts off the flow passage. A fluid cutoff valve is characterized in that a check valve is provided in a working fluid supply passage for moving a piston in a direction in which the cutoff valve is closed.

[Operation] The working fluid is supplied to the closed side in the cylinder, and the working fluid pressure is applied to the shutoff valve via the piston to close the fluid flow path. At this time, since the check valve provided in the flow path for supplying the working fluid blocks the backflow of the working fluid from the cylinder, the working fluid pressure applied to the shutoff valve is maintained as it is.
The closed state by the shutoff valve is also maintained.

[Embodiment] FIGS. 1 (a) and 1 (b) are views showing a configuration of an embodiment of the present invention, in which a poppet 1 serving as a shutoff valve is a fluid actuator 2
Driven by. The poppet 1 itself operates to open and close the connection port 6 between the vacuum experimental device 3 launched by a rocket and the external device 4. Fluid actuator 2
Is driven by the working fluid delivered by a pump on the working fluid source side (not shown) which is a ground device. The working fluid is supplied into the cylinder 8 via the direction switching valve 7 on the side of the ground device. The flow paths 5A and 5B connecting the direction switching valve 7 and the cylinder 8 are provided with a connector (quick connector) CD capable of rapidly disconnecting the two when the rocket is launched. The direction switching valve 7 is a so-called solenoid valve, and switching operation is performed by electromagnetic force.

By this direction switching valve 7, the working fluid is switchably supplied to the chamber 8A or 8B of the cylinder 8, and the piston 10 moves up and down in the cylinder 8. When the working fluid is supplied to the chamber 8A side, the piston 10 moves downward in the cylinder 8 until it comes into contact with the partition wall 11 formed on the inner wall of the cylinder and at the lower stop position. Also, the chamber 8
When the working fluid is supplied to the B side, the piston 10 moves upward and moves until it comes into contact with the partition wall 12 formed on the inner wall of the cylinder at the upper stop position.

The poppet 1 is connected to the piston rod 15 of the fluid actuator 2 that operates in this manner. As described above, when the piston 10 moves to the lower stop position, the stroke of the piston rod 15 is adjusted so that the poppet 1 closes the connection port 6 and the pressure of the working fluid is sufficiently applied to the poppet 1. In the illustrated example, the spring 31 is provided to press the poppet 1 toward the closed side, but this spring may not be provided.

A 0 ring 17 is embedded around the connection port 6 and prevents inflow and leakage of fluid from the outside when the O-ring 17 is closed by the poppet 1. Further, a seal member 18 is also provided on the outer peripheral portion of the piston 10 which is in sliding contact with the inner wall of the cylinder 8 to prevent the working fluid from leaking between the chambers.

The piston 1 is moved toward the chamber 8A side of the fluid actuator 2, that is, in the direction in which the poppet 1 is kept closed.
A check valve 20 is provided at a connection port of the working fluid supply flow path 5A for moving 0 to the cylinder 8. After the working fluid is supplied to the chamber 8A side to close the poppet 1, the check valve 20 prevents the working fluid from flowing back into the chamber 8A. Therefore, the working fluid pressure is continuously applied to the poppet 1 via the piston rod 15, and the closed state of the poppet 1 is maintained.

When launching the vacuum experimental apparatus incorporating the shut-off valve configured as described above, first, the direction switching valve 7 on the ground equipment side is operated to supply the working fluid to the chamber 8B side of the cylinder 8 to cause the piston to move. 15 is moved to the upper stop position to open the poppet 1. Therefore, the vacuum experimental apparatus 6 and the vacuum exhaust apparatus 4 serving as an external apparatus are connected to each other through the connection port 6, and the inside of the vacuum experimental apparatus 6 is evacuated to a vacuum state. After exhaustion, the working fluid is supplied to the chamber 8A side to close the poppet 1 and close the connection port 6. Before launching, the connectors of the flow paths 5A and 5B between the direction switching valve 7 on the ground side and the cylinder 8 are disconnected. At this time, the check valve 20 is closed by the pressure of the working fluid as shown in FIG. 1 (b), so the working fluid pressure in the chamber 8A is maintained at the value before the launch, and as described above, the poppet 1 is used. The closed state of the connection port 6 is maintained. After launching the experimental device in this state and experimenting in outer space,
The sealed condition will be maintained sufficiently until it is landed on the sea and collected.

As described above, the shutoff valve of the embodiment does not require the structure for maintaining the closed state by using the strong pressing force of the spring as in the conventional case, so that the shutoff valve can be reduced in size and weight. It is possible to increase the strength of the entire apparatus incorporating the device and improve the reliability of the entire apparatus.

In the above embodiment, the directional control valve is provided on the side of the device on the ground, but when there is enough space and weight, it is installed on the shutoff valve device side and the check valve is provided on the working fluid connection port of the directional control valve. You may A squeeze valve can also be used as the check valve.

[Effects of the Invention] As is apparent from the above description, the fluid cutoff valve according to the present invention can be reduced in size and weight without lowering the cutoff pressure.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) are views showing a configuration of an embodiment of the present invention,
FIG. 2 is a diagram showing a conventional example. 1 ... Poppet (shut-off valve), 2 ... Fluid actuator, 7 ... Direction switching valve, 8 ... Cylinder, 10 ... Piston, 15 ... Piston rod, 20 ... Check valve

Claims (1)

[Scope of utility model registration request] 1. A fluid cutoff valve in which a working fluid is supplied into a cylinder through a directional control valve to move a piston forward and backward, and a flow path is blocked by a valve body attached to the piston rod. And a check valve provided in a working fluid supply path for moving the piston in a direction in which the cutoff valve is closed.