JPH0562703U - Pneumatic system - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pneumatic system that can use all of dehumidified air to drive a pneumatic actuator. [Constitution] Air conditioner press 12 and pneumatic cylinder 11
A membrane module air dryer 16 is provided between the inlet and outlet ports P of the switching valve 13 for supplying and discharging compressed air to the switching valve 13
Exhaust ports EA and EB of the membrane module air dryer 1
The compressed air is dehumidified by the exhaust of the pneumatic cylinder 11 which is connected to the purge passage 16a of No. 6 in FIG. [Effect] The running cost of the pneumatic system can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pneumatic system that drives a pneumatic actuator with compressed air.

[0002]

[Prior Art]

 As shown in FIG. 2, the pneumatic cylinder 1, the air source 2, the switching valve 3, the tube 4 connecting the compressed air source 2 and the inlet port P of the switching valve 3, and the outlet port A of the switching valve 3. , B and the pressure chambers 1a, 1b of the pneumatic cylinder 1 are individually connected to each other, and the compressed air from the air source 2 is supplied to and discharged from the pressure chambers 1a, 1b by the switching valve 3. Pneumatic systems driving 1 are already known. Further, in the above-mentioned known pneumatic system, an air dryer is provided in the tube 4 in order to prevent troubles due to water in the compressed air. In this case, it is conceivable to use a membrane module air dryer 6 that dehumidifies the air by the membrane module as the air dryer. The membrane module air dryer 6 uses the high-humidity air passing through the membrane module and the membrane module. The moisture content of the high-humidity air is separated by the osmotic pressure based on the difference in the water vapor mole fraction from the purged air passing through the surrounding space. It is necessary to supply it to the air dryer 6 as charge air. However, since the air dryer 6 needs to use about 20 to 30% of the entire dehumidified air as the purge air, the entire dehumidified air cannot be used to drive the pneumatic cylinder 1, resulting in a high running cost. There's a problem.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide a pneumatic system in which all of the dehumidified air is used to drive a pneumatic actuator, and running costs can be significantly reduced.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a pneumatic system including an air source, a pneumatic actuator, and a switching valve that supplies and discharges compressed air from the air source to at least one pressure chamber of the pneumatic actuator, A membrane module air dryer that dehumidifies the air with a membrane module is provided between the air source and the inlet port of the switching valve, and the exhaust port of the switching valve is connected to the purge passage of the membrane module air dryer. .

[0005]

[Action]

 The compressed air from the air source is dehumidified by the membrane module air dryer, and all of the dehumidified air is supplied from the switching valve to the pressure chamber to drive the pneumatic actuator, and the air discharged from the pressure chamber is exhausted from the switching valve. The compressed air passing through the membrane module is dehumidified through the purge passage of the membrane module air dryer from the port and then discharged to the outside.

[0006]

【Example】

 FIG. 1 shows an embodiment of the present invention. This pneumatic system includes a pneumatic cylinder 11 as an example of a pneumatic actuator, an air compressor 12 as an example of an air source, an inlet port P, outlet ports A and B, and an exhaust port. A switching valve 13 having EA and EB for switching the outlet ports A and B to communicate with the ports P and EA and EB, a tube 14 connecting the air compressor 12 and the inlet port P of the switching valve 13, and an outlet. The tubes 15a and 15b that individually connect the ports A and B and the pressure chambers 11a and 11b of the pneumatic cylinder 11, the membrane module air dryer 16 in the tube 14, the exhaust ports EA and EB of the switching valve 13, and the membrane module air dryer. It has a tube 17 which communicates with the 16 flow passages 16a. Reference numeral 18 in the drawing is a speed controller.

In the above embodiment, when the ports P and B and A and EA of the switching valve 13 are in communication with each other, the compressed air of the air compressor 12 is dehumidified by the membrane module air dryer 16 and then The whole is supplied from the outlet port B of the switching valve 13 to the pressure chamber 11b of the pneumatic cylinder 11 to drive the pneumatic cylinder 11, and the air discharged from the pressure chamber 11a is discharged from the exhaust port EA of the switching valve 13 to the membrane module. The compressed air passing through the membrane module is supplied to the purge channel 16a of the air dryer 16 to be dehumidified and then discharged to the outside. When the switching valve 13 is switched by the solenoid and the compressed air dehumidified by the membrane module air dryer 16 is output from the outlet port A, all the air is supplied to the pressure chamber 11a and the air discharged from the pressure chamber 11b is The compressed air is dehumidified through the purge passage 16a of the air dryer 16 and then discharged to the outside. Therefore, since all the air dehumidified by the membrane module air dryer 16 can be used for driving the pneumatic cylinder 11, there is no wasteful consumption of the dehumidified air, and the compressed air is dehumidified by the air discharged from the pressure chamber. Therefore, the running cost of the pneumatic system can be significantly reduced.

Although the inlet port P of the switching valve 13 and the exhaust ports EA and EB are connected to the membrane module air dryer 16 by the tubes 14 and 17 in the above-mentioned embodiment, they are connected without a tube. The port may be directly connected to a predetermined portion of the air dryer 16. Further, the pneumatic cylinder 11 may be a single-acting type, and in this case, the switching valve 13 can of course be a three-port valve.

[0009]

[Effect of the device]

 In the present invention, the air discharged from the pressure chamber of the pneumatic actuator is used as the purge air of the membrane module air dryer, so that all the air dehumidified by the membrane module air dryer can be used for driving the pneumatic actuator. The running costs of pneumatic systems can be significantly reduced because there is no wasted consumption of moist air.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a known pneumatic system.

[Explanation of symbols]

 11 Pneumatic Cylinders 11a, 11b Pressure Chamber 12 Air Compressor 13 Switching Valve 16 Membrane Module Air Dryer 16a Purge Flow Path P Inlet Port EA, EB Exhaust Port

Claims (1)

[Scope of utility model registration request] 1. A pneumatic system comprising an air source, a pneumatic actuator, and a switching valve for supplying / discharging compressed air from the air source to / from at least one pressure chamber of the pneumatic actuator, the inlet of the air source and the switching valve. An air pressure system characterized in that a membrane module air dryer for dehumidifying air by a membrane module is provided between the port and the port, and an exhaust port of the switching valve is connected to a purge flow path of the membrane module air dryer.