Electric Actuator

Abstract

To provide an electric actuator that can be maintained without discharging all the power stored in the storage body, without forgetting the operation of returning to the normal use state, and without time constraints. A switch (up and down slide switch) (31) is provided on the passage for supplying electric power from the storage body (30) to the motor (25). A bar member (42) having protrusions (42a), (42b), (42c), and a button (42d) is provided. In the state where the operating end is fully closed and the power supply from the accumulator (30) to the motor (25) is cut off, press the button (42d) to press the gear (35) so that the motor (25) and the output Axis (37) is not connected. Again, the control lever (31a) is pressed up with the protrusion (42b) to make the switch (31) closed. When the power-on state switching switch (31) of the closed state is re-energized, the protrusion (38a) of the cam (38) presses the control lever (31a) by the rotation of the output shaft (37), and automatically returns to the off state. open state.

Description

technical field [0001] The invention relates to an electric actuator for driving operating ends such as valves and dampers. Background technique [0002] Conventionally, in air-conditioning equipment, electric actuators have been used to control the opening and closing of the valves installed in the hot and cold water piping and the opening of the damper to increase and decrease the air volume of the conditioned air passing through the pipes and supplying the air-conditioned area. . [0003] Such a general electric actuator has a motor inside the electric actuator, and operates according to a control command from an air-conditioning controller so that the opening degree of an operating end such as a valve or a damper becomes a set opening degree. [0004] In this type of electric actuator, once the supplied power fails, the opening of the operating end becomes the same as before the power failure, and proper opening control cannot be performed. [0005] Therefore, there ar...

AI Technical Summary

Problems solved by technology

[0009] However, when comparing these two types of electric actuators with an emergency shut-off function, the spring return type operates as a resistance to normal motor drive due to the force exerted by the return spring, and torque must be used to resist this resistance. A large motor has the disadvantages of increasing the size, weight, and cost of the electric actuator

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