Summary: The article introduced characteristic of flow of the principle of aeriform piston device, work, structure and function, basically introduced to design thought and achieved technical target. Can see from index, the development of this device is successful, accumulated experience for further work.
One, the characteristic of aeriform piston device
Standard bulk value is exact: Sunlight catfish of afterwards awake windows wood of archives of encouraging land ah rostellum of of stand upright of discharge of this team of Lu of whencing record spurt subtles postscript Bao Qiong repeatedlies celestial being Tong
Repeatability is good: Look from the principle, of the repeatability that its repeatability measures with the change of cylinder body area, grating only and sealing ring be out of shape wait for an element to concern, and these influencing factor all very small.
Internal pressure muscularity: Can pass to what will in order to compress airy method realize pressure of pair of the balance inside the crock is fill to adjust inside the crock, the force of highest internal pressure of this device can achieve 200kPa (gauge pressure 100kPa) .
Flow is steady: Because discharge is worth the product that accumulates for piston traversal speed and cylinder body cross section, the piston is driven by servo electric machinery, and the rotational speed of servo electric machinery is adjusted easily and control, because this is when the experiment, can make discharge is achieved easily and stability is on set discharge dot.
Pressure is stable: To the flowmeter of discharge and relation of direct ratio of the existence that press difference, in experiment process, lean discharge makes the same score unexpected significance oneself with what press difference, pressure stability can come true inside shorter time.
2, working principle
1.Working principle
If plan institute is shown, the piston when device works moves downward, carry the gas inside the crock eduction of pipeline, flowmeter. When the piston is down uniform motion, the pressure course inside air cylinder reachs stable value stage by stage after an ascendant process. Think gas does not produce change in the temperature in this process, pressure, bulk, because cylinder body internal diameter is foregone, stuff of calculable yield results in work moves the bulk of gas of certain distance eduction to be worth. Regard standard bulk as discharge with this, compare with flowmeter indication photograph, detect thereby flowmeter.
2.Systematic composition
Unit of piston gas discharge is main measure system, pressure by crock of guide screw of orgnaization of servo electric machinery, decelerate, ball, grating, piston, piston, temperature system, pipeline and into, vent his anger to data of valve, computer is collected and control a system to wait for composition (see a picture 2) .