A Throat Area Adjustable Critical Flow Venturi Nozzle with a Throat Runner

Abstract

A critical flow Venturi nozzle with an adjustable throat area with a throat runner, comprising an upstream converging section, a downstream diverging section and a throat runner wrapped between them; there are different diameters on the throat runner The throat hole, the constricting flow channel of the upstream constriction section, the diverging flow channel of the downstream diverging section, and the throat hole on the throat runner form a critical flow Venturi nozzle; the throat runner is rotated by adjusting the handwheel, Therefore, different throat holes are selected to cooperate with the contracting flow channel and the diverging flow channel, thereby changing the throat area of ​​the critical flow nozzle; the joint action of the adjustment handwheel combined with the spring positioning pin can accurately determine the position of the throat and then determine the throat. The size of the mouth area; the device can conveniently realize the online adjustment of the critical flow without stopping the flow, and has the advantages of wide flow adjustment range, good fluid circulation performance, high flow control accuracy, simple structure, reliable performance, and can be applied to high temperature and high pressure fluids, etc. .

Description

technical field [0001] The invention belongs to the technical field of fluid control and measurement, and in particular relates to a critical flow Venturi nozzle with an adjustable throat area and a throat runner. Background technique [0002] Critical flow Venturi nozzles are widely used in the control and measurement of fluid flow. For a specific fluid, the flow through a critical flow Venturi nozzle is determined by the nozzle inlet flow parameters and the nozzle throat area, and is not affected by downstream pressure fluctuations. For the traditional critical flow Venturi nozzle, which has a fixed throat area, when the critical flow needs to be changed, the only way to change the parameters of the fluid at the nozzle inlet, such as stagnation pressure, temperature, etc. But when the inlet parameters are changed, the back pressure ratio will change accordingly, even the critical flow condition cannot be satisfied. On the other hand, the outflow coefficient of the critic...

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Problems solved by technology

Because this method will make the device bulky and extremely complicated, it is currently less used in engineering

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