How does an elliptical gear flowmeter leak

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1. What principle does the elliptical gear flowmeter use to measure flow rate? What are the characteristics?

1、 The principle of elliptical gear flowmeter is that the measuring part of the elliptical gear flowmeter is mainly composed of two meshing elliptical gears and their housing (measuring chamber). Under the action of the pressure difference △ p=pl-p2 of the measured medium, the elliptical gears generate a torque to rotate. At the position shown in (a), due to P1>P2, the resultant torque generated by the action of P1 and P2 causes wheel 1 to rotate clockwise, discharging the medium in the half moon area between wheel 1 and the housing to the outlet, and driving wheel 2 to rotate counterclockwise. At this point, 1 is the driving wheel and 2 is the driven wheel. In (b), it is the middle position, where 1 and 2 are both driving wheels; At the position shown in (c), the combined torque of P1 and P2 acting on wheel 1 is zero, and the combined torque acting on wheel 2 causes the wheel to rotate counterclockwise and discharge the medium that has been sucked into the half moon volume to the outlet. At this point, wheel 2 is the driving wheel and wheel 1 is the driven wheel, which is exactly opposite to the situation shown in (a) In this reciprocating cycle, Wheel Sock 1 and Wheel 2 alternate with each other, driven by one to rotate the other, and the measured medium is discharged from the inlet to the outlet in half moon volume units at a time Obviously, as shown in (a), (b), and (c) of the figure, it only represents the situation where the elliptical gear has rotated 1/4 of a circle, and the measured medium silver slag discharged is a half moon shaped volume So, if the measured dielectric mass of the ell

iptical gear per revolution is four times the half moon product, the volumetric flow rate Q measured by the elliptical gear meteor gauge is: [4] Q=4n υ 0, where n - the rotational frequency of the elliptical gear (revolutions per second); υ 0-- Volume of the crescent shaped part (in shells) In this way, under the condition that the half moon product υ 0 of the elliptical gear flowmeter is constant, as long as the rotational speed n of the elliptical gear is measured, the flow rate of the measured medium can be known. The display of the flow signal (i.e. the rotational speed n of the elliptical gear) of the elliptical gear flowmeter has two types: local display and remote display. After a series of deceleration and speed ratio adjustment mechanisms, the rotation of the gears is directly connected to the indicator pin on the instrument panel and the total amount is displayed through a mechanical counter. Remote transmission display mainly drives the permanent magnet to rotate through the gear after deceleration, so that the contacts of the spring relay close or open synchronously with the rotation frequency of the permanent magnet, thereby sending out electrical pulses to another display instrument for remote transmission. The elliptical gear flowmeter has high measurement accuracy and is suitable for measuring the flow rate of high viscosity media, but it is not suitable for fluids containing solid particles. If gas is mixed in the measured liquid medium, it will also cause measurement errors. The accuracy of an elliptical gear flowmeter can usually reach level 0.5, making it a relatively accurate flow measurement instrument. However, if the flow rate of the measured medium is too small during use, the leakage error of th

1. What principle does the elliptical gear flowmeter use to measure flow rate? What are the characteristics?

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