The establishment of a piston type gas flow device

Abstract: the establishment of the piston gas flow device information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Key words: piston, gas flow rate, quantity transfer system, the characteristics of gas piston device standard volume value accurate: standard volume only about falling distance and diameter of the cylinder body, less related influencing factors. Repeatability: look from the principle, its repetition. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the establishment of the piston gas flow device article details. Key words: piston, gas flow rate, quantity transfer system, the characteristics of gas piston device standard volume value accurate: standard volume only about falling distance and diameter of the cylinder body, less related influencing factors. Repeatability: look from the principle, the change of its repeatability and cylinder area only, grating measurement repeatability and deformation of the sealing ring, and these factors are very small. Internal pressure is large, can through to filled with compressed air in cylinder method to realize the balance the pressure inside the cylinder, this device of high pressure can reach 200 kpa (zui Gage pressure of 100 kpa) 。 Flow stability: due to the flow rate value is the product of the cross-sectional area of the piston speed and cylinder, piston, driven by servo motor and servo motor rotation speed is easy to adjust and control, thus in the test, can easily make the flow and stability on the flow set point. Pressure stability: the flow rate and pressure difference, there is a proportional relationship of flowmeter in the process of test, by the flow rate and pressure difference from flat horizontal relationship, can be implemented in a relatively short period of time pressure stability. Second, the working principle of the 1. Working principle, as shown in the figure device piston downward movement at work, will be in cylinder gas through the pipeline, the flow meter. When the piston downward motion at a constant speed, the pressure inside the cylinder after a rise in process gradually achieve the stable value. Gas in the process of temperature, pressure, volume change, due to the cylinder diameter is known, can calculate the piston runs the volume of a gas discharge from a certain distance value. As a standard volume flow, compared with the flowmeter in value, flow meter can be inspected. 2. System of piston gas flow is mainly composed of servo motor, deceleration devices, ball screw, grating, piston cylinder, piston, temperature measuring system, pressure measurement system, piping and inlet and vent valve and computer data acquisition and control system, etc. 3. The expulsion of gas volume flow calculation method to calculate the piston down volume value: v = A * h ( 1) Type: A— — Cylinder block area, m2; h— — The piston down effective height, m; Believe that the temperature of the gas inside the cylinder, pressure is constant, so the piston gas volume flow of gas accumulation is through the flowmeter. Namely: the Vp = v ( 2) Through the flowmeter gas instantaneous volume flow is: the qs = Vp/t ( 3) Type: qs— — Given the quality of the flow standard device, kg/s. t— — Test time, s; Three, the mechanical structure piston core part of the gas flow device for the piston and cylinder block. Is the piston within the cylinder and piston of the cylinder block of closed space provides a accurate volume flow metering, work when the piston within the cylinder along the cylinder axis translation, on the premise of guarantee seal, piston and piston cylinder cross-sectional area within the moving distance of the product is the standard cumulative flow device is given. Therefore, the design of the device mainly to ensure the seal between the piston and cylinder piston, piston cylinder geometry tolerance, size tolerance index as the center, combined with domestic machining cost performance under the condition of factors such as comprehensive consideration. Mechanical structure of the device is mainly composed of cylinder block, piston, stroke measurement system, reduction and screw system, sealing system, the base and strengthening rod, in and out of the trachea road and valves, etc. 1. The smooth and reasonable overall structure according to the structure and the working process of similar devices, piston cylinder should be placed vertically, it has the following characteristics: a cylinder force uniform, not easy to deformation. B in cylinder seal oil accumulation occur such as leakage, will not affect the standard volume value. C piston pressure inside the cylinder has a certain weight. D the smooth running of the piston, is not easy to produce under the low speed crawl phenomenon. Due to the above motor and driving system is located in the piston cylinder, in order to increase stability and rigid system plus three strut, the strut and under the tray, and base on the connection. 2. By the design flow in cylinder piston cylinder volume calculation, considering the piston cylinder diameter - Height ratio, the size of the piston cylinder as: Ф 200 mm & times; 800 mm, 100 mm up and down the cylinder for non-work area, processing of main cylinder to guarantee middle garden within 600 mm inner cylinder shape tolerance of columns. (1) determine the cylinder body wall thickness of cylinder wall thickness should be able to meet under normal working conditions of cylinder body strength and stiffness requirements. By the cylinder body of the radial and circumferential allowable stress and strain to calculate the cylinder wall thickness. For cylinder wall thickness & delta; = 8. 6mm。 So, choose the cylinder wall thickness to 10 mm. (2) the cylinder volume deformation calculated by calculation can get in the 0 zui big work pressure. 2 mpa, the cylinder body interior volume deformation is 0. 0019%. Therefore zui of cylinder volume deformation under pressure effect can be ignored.

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