A smart gas meter built-in motor valve

Abstract

The invention discloses a built-in motor valve of an intelligent gas meter. The built-in motor valve comprises a valve assembly and a motor assembly. The valve assembly comprises a valve body, a sealed cover, a nut and a screw. The motor assembly comprises a motor base, a seat cover, a motor and a transmission gear assembly. The valve body is fixedly connected with the motor base. The nut comprises a nut sleeve in threaded screw fit with the screw. The top end of the nut sleeve is provided with a limiting baffle. A conical part or a spherical part is formed in the top end of the screw. The transmission gear assembly comprises a transmission sleeve. A plurality of ratchets including in the same clockwise direction are arranged on the inner wall of the transmission sleeve. A transmission base is fixed to the outer portion of the screw. A plurality of elastic pawls matched with the ratchets are arranged on the periphery of the transmission base. The free ends of the elastic pawls are clamped in tooth grooves of the ratchets. The built-in motor valve is simple and reasonable in structure; when the valve is opened in place, the screw and the nut can not be self-locked, when the valve is closed in place, the motor can not be damaged by a locked rotor, working performance is stable and reliable, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of valve control, in particular to a built-in motor valve of an intelligent gas meter. Background technique [0002] Smart gas meters usually use motor valves as actuators to control the opening and closing of gas meters. At present, the structure of the built-in motor valve of common smart gas meters mainly includes valve body, valve seat, valve cover, motor, reduction gear set, screw, nut and sealing cover. The valve body is fixedly connected to the valve seat through the valve cover, and the motor and reduction gear The group is correspondingly installed in the valve seat. The top end of the screw rod is connected to the sealing cover through the nut. The bottom end of the screw rod passes through the valve cover and is connected to the reduction gear set. The top of the valve body is provided with a valve port corresponding to the sealing cover. . When working, the motor drives the screw to rotate thro...

AI Technical Summary

Problems solved by technology

[0003] However, the defects of the built-in motor valve of the existing intelligent gas meter are: first, because the external thread of the screw rod will form a tool relief groove during processing, when the motor valve is in place when the valve is opened, the internal thread of the nut will be screwed into the tool retraction groove. In the groove, the nut and the screw will be self-locked due to a large friction torque. When the motor provides low power to close the valve, this friction torque may cause the screw to be stuck between the nut and the motor. The valve closing function fails, causing safety hazards; second, because the motor directly drives the screw to rotate through the reduction gear set, when the motor valve closes the valve in place, the motor will be blocked, which will affect the service life of the motor

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