Motor gear for valve electric actuator

Abstract

The invention discloses a motor gear for a valve electric actuator. The motor gear comprises an outer metal gear, a metal sleeve and an insulating isolator, wherein the metal sleeve is coaxially arranged in the outer metal gear, and the outer metal gear and the metal sleeve are connected by the insulating isolator. According to the motor gear for the valve electric actuator, an insulation and voltage resistance standard is reached between the outer metal gear and a motor shaft through the insulation isolator; the degree of tight fit between the motor shaft and the outer metal gear is improvedthrough the metal sleeve, and the transmission of a greater torsion of the motor shaft is facilitated, so that the insulating isolator acts as the rigid connection between the outer metal gear and themetal sleeve while acting as the insulation isolation, the insulation and voltage resistance of the whole actuator reach the standard (greater than or equal to 2Ui plus 1000 V), and the transmissionrequirements of the greater torsion are met; and the structure is simple and reliable, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of valve electric actuators, in particular to a motor gear used in valve electric actuators. Background technique [0002] DC motors include brushed DC motors and DC brushless motors. Due to their small size and high efficiency, they are more and more widely used in the field of valve electric actuators (hereinafter referred to as actuators). [0003] The common working voltage of DC motors is <DC60V, mainly DC24V, DC12V, DC5V and so on. According to the "JBT 8528 Ordinary Valve Electric Device" standard, the insulation withstand voltage between the motor shell and the coil or between the built-in drive board and the shell is ≥500V, which meets the standard, which is also the withstand voltage standard that the motor can easily achieve. [0004] The common structure of the actuator is DC motor + reducer + control board, in which the control board is divided into a high voltage part [voltage > 60V] and a low vol...

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Problems solved by technology

[0014] Both of the above two methods use plastic gears, which can be used in the case of low motor torque, but in the case of large motor torque, due to the plastic gear itself has defects such as low strength and poor wear resistance, the plastic gear cannot meet the requirements of the actuator. The service life under a large load, so only metal gears can be used, but the overall pressure resistance of the product cannot meet the standard requirements between metal gears

[0015] In addition, although there is another way to improve the insulation withstand voltage of the motor, which is to make the voltage reach 2Ui+1000V, due to the structure of the DC motor, even if it can meet the insulation withstand voltage, its cost is very high, which loses It is necessary to use it in the field of valve electric actuator

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