JP2022158751A - pneumatic actuator - Google Patents

Abstract

To provide a pneumatic actuator which is actuated not only at the time of an excessive pressure but also at the time of pressure reduction.SOLUTION: In a pneumatic actuator, a pneumatic chamber 2 is provided at an opposite side from an atmospheric pressure chamber 8 where an excessive-pressure-time actuation spring 5 is provided, with a diaphragm 7 interposed therebetween, and a pressure-reduction-time actuation spring 1 is provided in the pneumatic chamber. At the time of an excessive pressure, the excessive-pressure-time actuation spring 5 is shrunk, the diaphragm 7 can be actuated toward the atmospheric pressure chamber 8, and an actuator rod 4 can be actuated. At the time of pressure reduction, the pressure-reduction-time actuation spring 1 is shrunk, the diaphragm 7 can be actuated toward the pneumatic chamber 2, and the actuator rod 4 can be actuated. Thus, control can be performed to both the time of excessive pressure and the time of pressure reduction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pneumatic actuator capable of controlling both when the pressure becomes excessive and when the pressure is reduced.

Some conventional pneumatic actuators have an overpressure operating spring in an atmospheric pressure chamber (see, for example, Non-Patent Document 1).

Motoo Aoyama "Mechanism of the latest all-color car" Natsume Co., Ltd. July 10, 2016

The conventional pneumatic actuators described above operate only when pressure is excessive. Therefore, it could not be operated during depressurization.

Therefore, in order to solve the above-mentioned problems, the present invention provides a pneumatic actuator provided with an air pressure chamber on the opposite side of a diaphragm from an atmospheric pressure chamber having an overpressure spring and a decompression spring therein. did.

In the pneumatic actuator of the present invention, when the pressure becomes excessive, the overpressure actuation spring can contract to move the diaphragm toward the atmospheric pressure chamber and actuate the actuator rod. During decompression, the decompression actuation spring contracts to move the diaphragm toward the pneumatic chamber and actuate the actuator rod. As a result, control can be performed both when the pressure becomes excessive and when the pressure is reduced.

Cross section of pneumatic actuator

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the figure, 3 is an atmospheric pressure chamber side case made of metal, plastic, etc., 4 is an actuator rod, and 6 is an air pressure chamber side case. The pressure actuation spring and the diaphragm of 7;

1 Actuation spring for reduced pressure 2 Air pressure chamber 3 Atmospheric pressure chamber side case 4 Actuator rod 5 Actuator rod for excessive pressure 6 Air pressure chamber side case 7 Diaphragm 8 Atmospheric pressure chamber

Claims (1)

A pneumatic actuator equipped with a depressurization spring in a pneumatic chamber on the opposite side of the diaphragm from the atmospheric pressure chamber where the overpressure spring is located.

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