Diaphragm type gas meter

Abstract

The invention provides a diaphragm type gas meter. The diaphragm type gas meter comprises a movement, wherein the movement comprises a diaphragm box, two surface diaphragms, two diaphragm covers, a valve cover and four-axis coupling rotation systems, wherein the diaphragm box comprises a valve base and two metering chambers; the two surface diaphragms are located in the metering chambers, respectively; each surface diaphragm is connected with the corresponding four-axis coupling rotation system; a vertical shaft is fixedly connected with one end of a rocking bar and the other end of the rocking bar is hinged to one end of a connection rod; the other end of the connection rod is hinged to a crank; a central shaft of the crank is a third rotary shaft; a central crank wheel sleeves a middle shaft; the valve cover and the central crank wheel are coaxially arranged; the central crank wheel rotates around the middle shaft so that the valve cover rotates around the middle shaft synchronously; the deviation between mounting extreme positions and optimal extreme positions of the surface diaphragms is in a range from -0.5mm to +0.5mm, and the angle error of the rocking bar is in a range from -0.8 degree to +0.8 degree; and a fine tuning device is mounted on the central crank wheel. The gas meter is good in metering accuracy and high in metering precision and an applicable range of the diaphragm type gas meter is expanded.

Description

technical field [0001] The invention relates to the technical field of gas meter equipment, in particular to a membrane gas meter. Background technique [0002] In the existing membrane gas meter, since the membrane is a flexible rubber part and the transmission mechanism is composed of plastic parts, it is difficult to guarantee the accuracy in the manufacturing process. By changing the gear sleeve that drives the counter, adjust the number of teeth and use the gas meter standard calibration equipment to calibrate. The inspection meets the requirements. Due to the wide error distribution and the limited number of gears, there is a certain range and gear for adjusting the accuracy of the gas meter, so the accuracy is not enough. Contents of the invention [0003] The object of the present invention is to provide a membrane gas meter to improve the problem of poor measurement accuracy and low precision of the gas meter caused by the poor operation stability of the membrane...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a membrane gas meter, to improve the problem of poor measurement accuracy and low precision of the gas meter caused by the poor operation stability of the membrane gas meter in the prior art

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