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Looking at gas meters from the perspective of working principles: Do you know all these different types?

According to the working principle, there are mainly the following types of gas meters:

1. Diaphragm gas meter

Working principle: The measured gas enters from the inlet of the meter, fills the space inside the meter, and enters the metering chamber through the open slide valve seat hole. The gas pressure difference on both sides of the membrane drives the membrane of the metering chamber to move, forcing the gas in the metering chamber to flow out from the outlet through the slide valve and the distribution chamber. When the membrane moves to the end, the inertia of the rotating mechanism causes the slide valve cover to move in the opposite direction. The membrane moves back and forth once and completes one rotation. At this time, the meter reading value should be the flow rate of one rotation of the meter. The accumulated flow value of the diaphragm meter is the product of the flow rate of one rotation and the number of rotations.

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2. Roots gas meter

Working principle: As the gas passes through, the differential pressure generated between the inlet and outlet of the meter acts on a pair of waist wheels connected by a high-precision synchronous wheel, thereby driving the waist wheels to rotate in turn. During this period, the metering cavity formed by the waist wheel and the inner wall of the shell is periodically inflated and exhausted, and the number of rotations of the waist wheel is proportional to the volume of gas passing through the meter. The rotation of the waist wheel is decelerated by a multi-stage gear system, and then transmitted to the counter through magnetic coupling to accumulate the total amount of gas flowing through.

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3. Turbine gas meter

Working principle: When the fluid flows through the turbine flow sensor, the turbine is forced to rotate under the thrust of the fluid, and its speed is proportional to the average flow rate of the fluid. The rotation of the turbine periodically changes the magnetic resistance value of the magnetoelectric converter, and the magnetic flux in the detection coil changes periodically, generating a periodic electrical pulse signal. Within a certain flow range, the electrical pulse signal is proportional to the volume flow rate of the fluid flowing through the turbine flow sensor.

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4. Ultrasonic gas meter

Working principle: When the ultrasonic wave passes through the flowing fluid, within the same propagation distance, its propagation speed in the downstream direction and the upstream direction is different. In a wider flow range, the time difference is proportional to the volume flow rate (average flow rate) of the measured fluid in the pipeline.

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