Device for realizing incompressible fluid critical flow by applying mechanical choking principle

Abstract

The invention discloses a device for realizing incompressible fluid critical flow by applying the mechanical choking principle. The device comprises a cylindrical shell, wherein an irregularly-shaped hole plate is coaxially fixed in the cylindrical shell, a long slot is formed along the circumferential direction of the cylindrical shell, an inner hole and a spoiler guide hole are formed in the irregularly-shaped hole plate, the end face of the long slot is aligned at the end face of the spoiler guide hole, a spring-float acting chamber is arranged outside the cylindrical shell, a high precision linear spring and a float which are connected are arranged in the spring-float acting chamber, the float can perform free sliding in a guide channel formed by the long slot and the spoiler guide hole, an upper cavity of the spring-float acting chamber is communicated with a pipeline at the upstream of the irregularly-shaped hole plate through a high pressure guide channel, a lower cavity of the spring-float acting chamber is communicated with a pipeline at the downstream of the irregularly-shaped hole plate through a low pressure guide hole, thus an additional throttling element similar to the cavitation barrier layer in the traditional incompressible fluid critical flow device can be formed. The device has the advantages of low velocity of flow, small pressure loss, good safety performance, and capability of maintaining the incompressible fluid critical flow during the upstream and downstream pressure fluctuation.

Description

technical field [0001] The invention belongs to the technical field of fluid control and measurement, and in particular relates to a device for realizing the critical flow of incompressible fluid by applying the principle of mechanical blockage. Background technique [0002] The so-called critical flow means that under certain inlet parameters, when the downstream pressure of the critical flow device reaches a certain critical value, the flow rate will reach a maximum value. If the outlet pressure is further reduced, the flow rate will remain constant. It will not increase with the decrease of downstream pressure, at this time, the flow is also said to reach a choked state. In the congested state, the interference downstream of the device is completely blocked, and the flow rate can always remain highly constant. [0003] Critical flow phenomena can occur in both gas flows and liquid flows. In gas flow, when the flow velocity at the throat of the Venturi nozzle reaches the...

AI Technical Summary

Problems solved by technology

However, this congestion method has obvious shortcomings such as huge energy loss, high noise, poor safety performance, and no shielding effect on upstream pressure disturbances, which affects flow control and measurement accuracy.

Therefore, it is unacceptable in general scientific research and engineering to make the incompressible fluid generate critical flow based on the principle of cavitation. This is a scientific problem that needs to be solved urgently.

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