Improvement of Oval Gear Metering

Abstract: The improvement information of oval gear metering is provided by excellent flowmeter and flowmeter manufacturers. Taking the oval gear flowmeter as an example, this paper discusses the process and method of realizing the automatic calibration of the flowmeter and the technical transformation of the existing communication, which improves the work efficiency and better meets the current needs of flowmeter calibration in gas stations. . this method. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the improvement article on oval gear metering. Taking the oval gear flowmeter as an example, this paper discusses the process and method of realizing the automatic calibration of the flowmeter and the technical transformation of the existing communication, which improves the work efficiency and better meets the current needs of flowmeter calibration in gas stations. . This method can improve calibration accuracy and efficiency, and provide timely and accurate refueling services. 1 The working principle of the oval gear flowmeter The measuring part of the oval gear flowmeter is mainly composed of two intermeshing oval gears and their shells (measuring chambers). Under the action of the pressure difference Δp=p1-p2 of the measured medium, the oval gear generates a torque to make it rotate. In the position shown in Fig. 1a, since P1>P2, under the action of P1 and P2, the resultant moment causes the wheel 1 to rotate clockwise, and the medium in the half-moon container between the wheel 1 and the shell is discharged. to the exit, and drive wheel 2 to rotate counterclockwise. At this time, 1 is the driving wheel, and 2 is the driven wheel. Figure 1b shows the neutral position, with wheels 1 and 2 both driving wheels. In the position shown in Figure 1c, the resultant moment of P1 and P2 acting on wheel 1 is zero, and the resultant moment acting on wheel 2 makes the two wheels rotate counterclockwise, and sucks the medium in the half-moon container When it is discharged to the outlet, wheel 2 is the driving wheel and wheel 1 is the driven wheel, which is just the opposite of the situation shown in Figure 1a. In this reciprocating cycle, the wheel 1 and the wheel 2 alternately drive the other to rotate, and the measured medium is discharged from the inlet to the outlet with the half-moon volume as the unit. Obviously, Figure 1 only shows the situation that the oval gear rotates 1/4 of a circle, and the measured medium discharged by it is a half-moon-shaped volume; therefore, the measured medium discharged by the oval gear per revolution is a half-moon-shaped volume. 4 times the volume, the volume flow Q through the oval gear meteormeter is: Q=4nυ0 where n is the rotation frequency of the elliptical gear;υ0 is the volume of the half-moon. In this way, the half-moon volume of the oval gear flowmeterυUnder certain conditions, as long as the rotation speed n of the oval gear is measured, the flow rate of the measured medium can be known. The flow signal of the oval gear flowmeter (that is, the rotation speed n of the oval gear) has two types: local display and remote display. On-site display After the rotation of the gear is passed through a series of deceleration and speed ratio adjustment mechanisms, it is directly connected to the indicator needle on the instrument panel, and the total amount is displayed through the mechanical counter, as shown in Figure 2; the remote display mainly It drives the magnet to rotate through the decelerated gear, so that the contacts of the spring relay are closed or disconnected synchronously at the same rotational frequency as the magnet, thereby sending out electrical pulses to another display instrument. 2 Flowmeter system improvement 2.1 Principle of single-chip control system The hardware of single-chip control system is mainly composed of key part, single-chip part, communication part, pulse receiving part (counting part) and control valve, as shown in Figure 3. The pulse signal is counted by the counter part of the single-chip microcomputer, the host computer communicates with the single-chip microcomputer through RS485, and the valve control is realized by the electromagnetic relay. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Improvement of Oval Gear Metrology'

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