JPS6414904U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the pneumatic actuator according to this invention, Fig. 2 is a side view of the actuator shown in Fig. 1 with the external cover and filter removed, and Fig. 3 is a conventional pneumatic actuator. FIG. 4 is a side view showing the actuator of FIG. 3 with the pressing plate and end cover removed. 31...Housing, 32...Diaphragm, 34
...Press plate, 35...Connection fittings, 36...External case,
37... Compression spring, 38... Diaphragm chamber, 39...
Intake solenoid valve, 40...Atmospheric introduction hole, 41...Exhaust solenoid valve, 42...Negative pressure exhaust port, 55...Conductor plate, 56
...Connection conductor, 57...Output terminal. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The front end portion, which is housed in the housing and the outer case and is clamped to a retaining plate from which a connecting fitting is protruded, is supported so as to be able to move forward and backward, and is pressed in the forward direction by a compression spring to form a diaphragm chamber. a diaphragm, a pair of intake solenoid valves that are communicated with the atmosphere and open and close a passage to the diaphragm chamber, and an exhaust solenoid valve that is communicated with a negative pressure suction source and that opens and closes a passage to the diaphragm chamber. and a pneumatic actuator in which each of the solenoid valves is controlled by a control circuit, the pneumatic actuator comprising a connection means for energizing the compression spring from an external power source, and energizing the compression spring in a low temperature environment. A pneumatic actuator characterized in that the diaphragm is heated by heating the diaphragm.