Design and Research of Suspended Gyroscopic Mass Flow Meter

Abstract: The design and research information of the suspended gyro mass flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. 1. Introduction With the continuous improvement of the industrial level, people's requirements for flow measurement are also getting higher and higher. The current development trend is that simple volume flow measurement can no longer meet industrial requirements, while mass flow measurement is a more stable, more in line with production. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the research articles on the design of suspended gyro mass flowmeters. 1. Introduction With the continuous improvement of the industrial level, people's requirements for flow measurement are also getting higher and higher. The current development trend is that simple volume flow measurement can no longer meet industrial requirements, while mass flow measurement is a more stable, The measurement method that is more in line with the needs of production and trade transportation has been favored by the majority of users. The new type of suspended gyroscopic mass flowmeter we study uses the dual-channel method to realize mass flow measurement. It has a simple structure, is suitable for the measurement of dirty flow and two-phase flow, has good shock resistance, does not require external power supply for the sensor, and has a long service life. . The following first introduces the structure and working principle of the suspended gyro flowmeter. 2. The structure of the suspended gyro mass flowmeter The shell of the suspended gyro flow sensor is mainly composed of a contraction section, a throat section, a gradually expanding section, an abdominal section and a tail section, as shown in Figure 1. A small ball with a central through hole is sealed inside the shell, and a magnetic ring is arranged inside the small ball in a direction perpendicular to the through hole. The constricted section at the inlet and the tail and the gradually expanding section in the middle make a certain pressure difference between the front and rear of the sensor, which can be measured with a differential pressure sensor. When the fluid flows into the shell from the inlet, the ball will be suspended and stabilized in a potential well position. When the flow rate reaches a certain value, the ball will rotate around a fixed axis, and it will speed up with the increase of the flow rate. The speed of the ball and the flow rate are basically linear. There is an induction coil outside the sensor. According to Faraday's law of electromagnetic induction, the rotation of the small ball causes the wire to cut the magnetic field line and generate a voltage pulse signal. The frequency of the pulse signal can fully reflect the rotation frequency of the ball, and this frequency is also proportional to the volume flow of the fluid. The relationship between the rotation frequency of the ball and the fluid volume flow can be written as the following expression: f=K2qv (1) where f-----the rotation frequency of the ball (which can be detected by a frequency meter), Hz; K2-- ---The volume flow coefficient of the sensor. The differential pressure signal generated by the constricted section at the inlet and the tail and the gradually expanding section in the middle is detected by the differential pressure sensor. This signal can be expressed as: where qv----the volume flow of the fluid to be measured, m3/s; p1 --- Pressure before sensor, pa; p2--- Pressure after sensor, pa;ρ---- Density of the fluid to be measured under working conditions, kg/m3; k1 --- differential pressure flow coefficient of the sensor. The above formula can be rewritten as: (2) where △p——The pressure difference between the front and rear of the sensor, namely (p1-p2); divide both sides of equations (1) and (2) respectively to obtain qm in equation (3)—Mass flow of the fluid to be measured, K—The mass flow coefficient of the sensor. Equation (3) is the flow equation of the new mass flowmeter based on the principle of dual-channel signal detection. It can be seen from this equation that this new type of flowmeter is different from the traditional flowmeter. When the fluid to be measured flows through the sensor, two signals will be generated at the same time, and these two signals have inherent physics with the flow. Through flexible application, This results in the mass flow measurement shown above. 3. Theoretical analysis The physical basis of the suspension gyro flowmeter's work is the hydrodynamic suspension effect and the principle of moment of momentum. The former can ensure the stable suspension of the ball, and the latter converts the kinetic energy of the fluid into mechanical energy, and then converts it into electrical energy for flow measurement. The hydrodynamic suspension effect means that under certain hydrodynamic conditions, the rotating body in the fluid in the limited pipeline does not contact the pipe wall, nor is it washed away by the fluid, but is fixed at a certain position and is in a state of dynamic equilibrium. Because of the special pressure distribution, the ball can be stably suspended at a certain point (suspended point) in the fluid. The following two conditions are met at the suspension point (assuming F is a vector starting from the suspension point, and r=0 at the suspension point):——The force of the fluid acting on the suspension in all directions; Fr—Force in either direction; Kr—The stiffness coefficient of the hydrodynamic suspension in the r-direction. The space force on the ball is decomposed into three directions: X direction (axial), y direction (radial), z direction (transverse), because the force on the ball in the z direction is always equal (because the ball and the pipe It is symmetrical with respect to the axis of the pipeline), so the force on the ball in the z direction is not analyzed, but only the force in the axial and y directions of the ball is analyzed. The force on the ball in the x direction includes: the force Fp formed by the dynamic pressure head and the static pressure head of the jet flow on the upstream surface of the ball, the force Fn formed by the viscous friction force, and the force Fw formed by the static pressure at the tail of the ball .

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