JPH0636368Y2 - Diaphragm type quick exhaust valve with variable throttle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a diaphragm type quick exhaust valve having a variable throttle.

[Prior Art] A fluid pressure actuator such as a pneumatic cylinder is driven by supplying and discharging a pressure fluid such as compressed air to a pressure chamber through a switching valve and a fluid circuit.

In this case, if the switching valve is small and the piping between the switching valve and the pressure chamber is thin, it takes time to discharge the compressed air and the actuator speed slows down.If the switching valve is large and the piping is thick, the actuator However, there is a problem that the cost of the switching valve and the fluid circuit increases.

In order to solve this problem, it is conceivable to discharge the air of the actuator by the quick exhaust valve, but if the exhaust capacity of the quick exhaust valve is small, the speed increase of the actuator is small, and if the exhaust capacity is larger than necessary, The adiabatic expansion of air in the pressure chamber causes dew condensation, which may cause rust, swelling of the seal ring, poor lubrication, etc., resulting in malfunction of the actuator.

These problems can be solved by using a quick exhaust valve having an appropriate exhaust capacity according to the volume of the pressure chamber, but since the volume of the pressure chamber is different for each fluid pressure actuator, the pressure of various volumes can be reduced. Using a quick exhaust valve having an appropriate exhaust capacity according to the room not only increases the number of parts and costs, but also inventory management is troublesome.

The inventors of the present invention have previously proposed a rapid exhaust valve that solves the above problems in an application dated February 20, 1990.

The previously proposed rapid exhaust valve can obtain an appropriate exhaust capacity according to the volume change of the pressure chamber by one type of valve, but it is troublesome to assemble because of the large number of parts.

[Problem to be Solved by the Invention] The problem to be solved by the present invention is to provide a quick exhaust valve having a simple structure and capable of obtaining an appropriate exhaust capacity according to a volume change of a pressure chamber of a fluid pressure actuator. Especially.

[Means for Solving the Problems] In order to solve the above problems, a diaphragm type quick exhaust valve with a variable throttle according to the present invention includes a pressure fluid inlet port, an outlet port and a discharge port, and an outlet port, an inlet port and a discharge port. A supply flow path and a discharge flow path that communicate with the port,
In a rapid exhaust valve provided with a supply valve seat and a discharge valve seat in these flow passages arranged opposite to each other, and a valve body for opening and closing these valve seats, in order to allow the pressure fluid to pass through the valve body. Of the valve seat, one of the valve seats is formed in an annular shape having an inner diameter larger than the diameter of the opening, and the other is formed in a larger diameter than the diameter of the opening. It is characterized in that a needle for narrowing the discharge flow passage is provided downstream of the seat so that the throttle opening can be adjusted.

[Operation] When pressure fluid is supplied to the inlet port, the diaphragm is displaced to open the supply valve seat and close the discharge valve seat, so that the pressure fluid flows out from the outlet port through the opening of the diaphragm.

In this case, since the diameter of both valve seats is larger than the diameter of the opening, the diaphragm surely closes the discharge valve seat even if there is an opening,
Moreover, since the needle is provided on the downstream side of the discharge valve seat of the discharge channel, the pressure fluid passing through the supply channel is not throttled.

When the fluid pressure at the inlet port drops, the fluid pressure at the outlet port causes the diaphragm to move in the opposite direction, closing the supply valve seat and opening the discharge valve seat, so the fluid at the outlet port is rapidly discharged from the discharge port. To be done.

Also in this case, there is no problem in closing the supply valve seat by the opening,
Since the exhaust capacity can be adjusted by adjusting the throttle opening degree of the discharge passage with the needle, one kind of quick exhaust valve can obtain an appropriate exhaust capacity according to the volume of the pressure chamber of the fluid pressure actuator.

Further, since the diaphragm is provided between the supply valve seat and the discharge valve seat arranged facing each other, and the needle is provided in the discharge passage, the number of parts is small and the assembly is easy.

[Embodiment] The drawings show an embodiment of the present invention. This diaphragm type quick exhaust valve with a variable throttle includes a valve body 1, an adapter 2 attached to the valve body 1 by appropriate means, a valve body 1 A diaphragm 3 whose peripheral edge is held between the adapters 2 and a needle 4 described later are provided.

The valve body 1 includes a pressure fluid outlet port 6 and a discharge port 7, a discharge valve seat 9 in a discharge flow passage 8 connecting these ports, and a diameter reduction of the discharge flow passage 6 downstream of the discharge valve seat 9. Department
The adapter 2 includes a pressure fluid inlet port 12 having a smaller diameter than the ports 6 and 7, and a supply valve seat 14 in a supply flow path 13 that connects the ports 12 and 6 to each other. When installed, the valve seats 9 and 14 face each other and the inlet port 12 and the outlet port 6 are in substantially the same axial position.

The diaphragm 3 has an opening 3a at the center, and a supply valve seat
14 is formed in an annular shape having an inner diameter larger than the opening 3a, and the discharge valve seat 9 is formed larger in diameter than the opening 3a. However, the discharge valve seat 9 may be formed in an annular shape having an inner diameter larger than the opening 3a, and the supply valve seat 14 may be formed in a larger diameter than the opening 3a.

In the valve body 1, a nut 16 is fixed at a position facing the reduced diameter portion 10, and a needle 4 having a threaded portion screwed onto the nut 16 has one end facing the reduced diameter portion 10 and a threaded portion outside the nut 16. A lock nut 17 is screwed on and a handle 18 is attached to the other end. Therefore, when the handle 18 is rotated to bring the needle 4 closer to the reduced diameter portion 10, the discharge flow path 8 is narrowed and the handle 18
When is rotated in the opposite direction, the throttle opening degree of the discharge passage 8 is increased, and the position of the needle 4 is fixed by the lock nut 17.

The inlet port 12 is connected to a compressed air source by a pipe 20 such as a tube and a switching valve 21, and the outlet port 6 is connected by a pipe 22 such as a tube to a pressure chamber 23a of a pneumatic cylinder 23 which is an example of a fluid pressure actuator. The exhaust port 7 is connected and is open to the atmosphere either directly or by piping not shown.

When a tube is inserted into each of the inlet port 12 and the outlet port 6, a plurality of locking claws at the tip of the chuck 26 are locked to the tube and the seal member 27 seals the outer wall of the tube, and the release bush 28 is pushed in. Then, the so-called one-touch fittings 25, 25, which unlock the tube by the locking claws and allow the tube to be pulled out, are attached. If necessary, the one-touch fitting 25, which is described above, is attached to the discharge port 7. A muffler, an exhaust purifier, etc. can be attached.

In the above embodiment, the switching valve 21 is used to introduce compressed air into the inlet port.
When it is supplied to 12, the diaphragm 3 is displaced by the air pressure of the inlet port 12 to open the supply valve seat 14 and close the discharge valve seat 9, so that compressed air is opened by the opening 3a of the diaphragm 3.
Through the pipe 22, and is supplied to the pressure chamber 23a through the pipe 22 to drive the pneumatic cylinder 23 (first
See figure).

In this case, since the diameter of the discharge valve seat 9 is made larger than the diameter of the opening 3a of the diaphragm 3, the discharge valve seat 9 is reliably closed even if the diaphragm 3 has the opening 3a.

When the inlet port 12 communicates with the outside by switching the switching valve 21, the diaphragm 3 is displaced by the fluid pressure of the outlet port 6 to open the discharge valve seat 9 and close the supply valve seat 14. In this case, since the supply valve seat 14 is formed in an annular shape having a larger diameter than the opening 3a, there is no support for closing the supply valve seat 14 even with the opening 3a (see FIG. 2). Therefore, the pressure chamber 23
Since the compressed air of a is rapidly discharged from the discharge port 7, the fluid pressure actuator can be operated at high speed even if the small-sized switching valve 21 and the thin pipes 20 and 22 which are low in cost are used.

In this case, by moving the needle 4 forward and backward with respect to the reduced diameter portion 10 by the handle 18, the throttle opening degree of the discharge passage 8 is adjusted and the exhaust capacity is adjusted to an appropriate value according to the volume of the pressure chamber 23a. The position of the needle 4 is fixed by the lock nut 17.

Therefore, dew condensation due to adiabatic expansion due to excessive rapid exhaust can be prevented, so that one type of rapid exhaust valve can be applied to fluid pressure actuators of various volumes.

Further, in the above embodiment, since the diaphragm 3 is held between the valve body 1 and the adapter 2 and the needle 4 is screwed to the valve body 1, the number of parts is small and the assembly is easy.

[Advantage of the Invention] The diaphragm type quick exhaust valve with a variable throttle of the present invention can discharge the exhaust of the fluid pressure actuator at a rapid speed.
The switching valve and the piping can be made small and small in diameter, which makes it possible to make the fluid circuit inexpensive while the operation speed of the fluid pressure actuator is high.

Also, since the throttle opening of the discharge flow path can be adjusted by the needle, it is possible to respond to the volume changes of the pressure chambers of various fluid pressure actuators with one type of valve, which reduces the number of parts and reduces the cost. Not only can it be done, but inventory management will be easier.

Furthermore, since it has an extremely simple structure in which only the diaphragm and the needle are provided, the assembly is easy.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional view when a pressure fluid is supplied, and FIG. 2 is a vertical sectional view when a pressure fluid is discharged. 3 ... Diaphragm, 3a ... Opening, 4 ... Needle, 6 ... Exit port, 7 ... Discharge port, 8 ... Discharge passage, 9 ... Discharge valve seat, 12 ... Inlet port, 13 ... Supply channel, 14 ... Supply valve seat.

Claims (1)

[Scope of utility model registration request] 1. An inlet port, an outlet port, and a discharge port for a pressure fluid, and a supply passage and a discharge passage for communicating the outlet port with the inlet port and the discharge port, and these passages arranged to face each other. In a rapid exhaust valve having a supply valve seat and a discharge valve seat therein, and a valve body for opening and closing these valve seats, the valve body is constituted by a diaphragm having an opening for passing a pressure fluid, One of the valve seats is formed in an annular shape having an inner diameter larger than the diameter of the opening, and the other is formed in a diameter larger than the diameter of the opening, and the discharge flow passage is provided downstream of the discharge valve seat of the discharge flow passage. A diaphragm type quick exhaust valve with a variable throttle, which is provided with a needle for throttling so that the throttle opening can be adjusted.