JPH0545900Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rapid exhaust valve having a variable throttle mechanism.

[Prior art] Fluid pressure actuators such as pneumatic cylinders are
It is driven by supplying and discharging a pressure fluid such as compressed air to and from a pressure chamber via 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 will take time to discharge the compressed air and the actuator speed will be slow; if the switching valve is large and the piping is thick, the actuator will slow down. The speed increases, but there is a problem in that the cost of the switching valve and fluid circuit increases.

To solve this problem, it is possible to exhaust the air from the actuator using a quick exhaust valve, but if the exhaust capacity of the quick exhaust valve is small,
If the speed increase of the actuator is small and the exhaust capacity is larger than necessary, condensation will occur due to adiabatic expansion of the air in the pressure chamber, which will cause rust, swelling of the seal ring, poor lubrication, etc., and the actuator will be damaged. It may malfunction.

These problems can be solved by using a quick exhaust valve that has an appropriate exhaust capacity depending on the volume of the pressure chamber, but since the volume of the pressure chamber differs depending on the fluid pressure actuator, there are many different volumes. Using a rapid exhaust valve having an appropriate exhaust capacity according to the pressure chamber of the valve not only increases the number of parts and increases costs, but also makes inventory management troublesome.

[Problem to be Solved by the Invention] The problem to be solved by the present invention is to provide a rapid exhaust valve that can obtain an appropriate exhaust capacity according to changes in the volume of the pressure chamber.

[Means for Solving the Problems] In order to solve the above problems, the rapid exhaust valve with a variable throttle mechanism of the present invention communicates the inlet port, outlet port, and discharge port of the pressure fluid with the above-mentioned inlet port and outlet port. a supply flow path; a valve body installed in the supply flow path that opens and closes the supply flow path depending on the magnitude of fluid pressure on the inlet port side and the outlet port side;
A discharge flow path that communicates the supply flow path with the discharge port on the outlet port side of the valve body, a pilot chamber that communicates with the inlet port, and a pilot chamber that is slidably inserted into the pilot chamber and is connected to the inlet port side and the outlet port side. and a discharge valve body that opens and closes the discharge passage depending on the magnitude of fluid pressure, and when the fluid pressure at the inlet port is large, the valve body opens the supply passage and the discharge valve body opens the exhaust passage. When the valve is closed and the fluid pressure at the inlet port decreases, the valve body closes the supply flow path and the needle opens the exhaust flow path. Therefore, the present invention is characterized in that the needle is used to adjust the throttle opening of the flow path, and an adjustment member for adjusting the stroke of the needle is provided in the pilot chamber so as to be movable back and forth.

[Operation] Due to the fluid pressure supplied to the inlet port, the valve body opens the supply flow path, and the needle in the pilot chamber closes the exhaust flow path, so that the pressure fluid flows out from the outlet port.

When the fluid pressure at the inlet port drops, the fluid pressure at the outlet port causes the valve member to close the supply passage and the needle to open the exhaust passage in a throttling manner, causing the fluid at the outlet port to be rapidly discharged through the exhaust port.

In this case, when the stroke of the needle is adjusted by moving the adjustment member back and forth, the throttle opening of the discharge flow path by the needle is adjusted, and the exhaust capacity of the rapid exhaust valve can thereby be adjusted. With the exhaust valve, it is possible to obtain an appropriate exhaust capacity in response to changes in the volume of the pressure chamber.

[Embodiment] Fig. 1 shows an embodiment of the present invention, in which a valve body 1 in this rapid exhaust valve with a variable throttle mechanism communicates an inlet port 3, an outlet port 4, an exhaust port 5, and ports 3 and 4. A discharge channel 8 is provided with a supply channel 6, and a valve body 7 inserted into the supply channel 6 is provided with a discharge channel 8 that communicates ports 4 and 5.
is connected to a compressed air source by a pipe 9 and a switching valve 10, and the outlet port 4 is connected to a pneumatic cylinder 12, which is an example of a fluid pressure actuator, by a pipe 11.
The exhaust port 5 is connected to the pressure chamber 12a, and the exhaust port 5 is open to the atmosphere directly or via a pipe (not shown).

A valve member 14 made of an elastic material such as soft synthetic resin and having a substantially V-shaped cross section is attached to the outer peripheral surface of the valve body 7, and the lip 14a of the valve member 14 is compressed by the fluid pressure of the inlet port 3. The diameter of the outlet port 4 is increased to open the supply flow path 6, and the diameter is expanded by the fluid pressure of the outlet port 4 to close the supply flow path 6.

A bonnet 15 with a nut 16 caulked to the tip thereof is airtightly attached to an opening 1a formed in the valve body 1, and a needle 18 is airtightly and slidably inserted into a through hole 17 of the bonnet. The opening degree of the discharge passage 8 can be adjusted and closed depending on the size of the sliding stroke, and a return spring 19 is compressed between the discharge passage 8 and the valve body 7.

Adjustment member 21 hermetically inserted into through hole 17
The intermediate portion is screwed onto a nut 16 so that it can move forward and backward with respect to the bonnet 15, and a lock nut 22 is screwed onto the threaded portion outside the nut 16, and a handle 23 is attached to the tip. and the pilot pressure chamber 25 between the needle 18
communicates with the inlet port 3 by a pilot passage 26.

When a tube (not shown) is inserted into the inlet port 3 and the outlet port 4, the plurality of locking claws at the tip of the chuck 31 lock into the tube, the seal member 32 seals the outer wall of the tube, and the release button When the bush 33 is inserted, the locking of the tube by the locking pawl is released and the tube can be pulled out. So-called one-touch fitting 3
In this embodiment, the tube inserted into the one-touch fitting 30 is made thicker than the pipes 9 and 11.

Next, the operation of the above embodiment will be described.

When compressed air is supplied to the inlet port 3 by the switching valve 10, the diameter of the lip 14a is reduced by the supply air pressure to open the supply flow path 6, and at the same time, the lip 14a is opened by the pilot fluid pressure supplied to the pilot pressure chamber 25. Since the needle 18 then closes the discharge passage 8, compressed air is supplied to the pressure chamber 32a through the pipe 11, and the fluid pressure cylinder 32 is driven.

When the inlet port 3 is communicated with the outside by switching the switching valve 10, the lip 14a expands in diameter due to the air pressure at the outlet port 4 and closes the supply flow path 6, and the pilot air pressure in the pilot pressure chamber 25 decreases. The urging force of the return spring 19 causes the needle 18 to come into contact with the adjustment member 21 and open the discharge passage 88 in a constricted state, so that the compressed air in the pressure chamber 12a is rapidly discharged from the discharge port 5.

Therefore, the fluid pressure actuator can be operated at high speed even when using a small, low-cost switching valve 10 and thin pipes 9, 11.

In this case, by moving the adjustment member 21 back and forth to adjust the stroke amount of the needle 18, in other words, the throttle opening degree of the discharge passage 8 by the needle 18, the exhaust capacity of the discharge passage 8 can be adjusted to the volume of the pressure chamber 12a. This can prevent condensation caused by adiabatic expansion caused by excessive rapid exhaust, so one type of rapid exhaust valve can be used with fluid pressure actuators of various capacities. can.

[Effects of the invention] The rapid exhaust valve with a variable throttle mechanism of the present invention can rapidly discharge the exhaust gas from the fluid pressure actuator, so the switching valve and piping can be made smaller and have a smaller diameter. Although the fluid pressure actuator has a high operating speed, the fluid circuit can be made inexpensive.

In addition, since the throttle opening of the discharge flow path by the needle can be adjusted using the adjustment member, it is possible to respond to changes in the volume of the pressure chambers of various types of fluid pressure actuators with one type of valve. Not only does the reduced number of parts reduce costs, but inventory management becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention. 3...Inlet port, 4...Outlet port, 5...
Discharge port, 6... Supply channel, 7... Valve body, 8...
...Discharge channel, 14...Valve member, 18...Needle, 21...Adjustment member.

Claims (1)

[Claims for Utility Model Registration] An inlet port, an outlet port, and a discharge port for pressurized fluid, a supply channel that communicates the inlet port and the outlet port, and an inlet port side and an outlet port side installed in the supply channel. a valve body that opens and closes the supply passage depending on the magnitude of fluid pressure; a discharge passage that communicates the supply passage with the discharge port on the outlet port side of the valve body; and a pilot chamber that communicates with the inlet port. , a discharge valve body that is slidably inserted into the pilot chamber and opens and closes the discharge passage depending on the magnitude of fluid pressure on the inlet port side and the outlet port side,
When the fluid pressure at the inlet port is high, the valve element opens the supply flow path and the discharge valve element closes the exhaust flow path, and when the fluid pressure at the inlet port decreases, the valve element closes the supply flow path. In the rapid exhaust valve in which the needle opens the exhaust flow path, the discharge valve body is a needle that adjusts the throttle opening of the flow path by moving toward and away from the exhaust flow path, and the exhaust valve is connected to the pilot chamber. A rapid exhaust valve with a variable throttle mechanism, characterized in that an adjustment member for adjusting the stroke of a needle is provided so as to be movable back and forth.