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Critical flow venturi nozzle with throat rotating wheel and with adjustable throat area

A Venturi nozzle, critical flow technology, applied in the direction of volume/mass flow generated by mechanical effects, fluid flow detection by measuring differential pressure, etc. Accurate flow control and the effect of reducing pressure loss

Inactive Publication Date: 2015-04-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Critical flow venturi nozzle with throat rotating wheel and with adjustable throat area
  • Critical flow venturi nozzle with throat rotating wheel and with adjustable throat area
  • Critical flow venturi nozzle with throat rotating wheel and with adjustable throat area

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as figure 1 , figure 2 , image 3 As shown, a critical flow Venturi nozzle with an adjustable throat area with a throat runner, including an upstream converging section 1, a downstream diverging section 2, and a plurality of throat holes with different diameters wrapped between the two Throat runner 3 of 31. The converging channel 11 on the upstream contracting section 1, the diverging channel 21 on the downstream diverging section 2 and the throat hole 31 on the throat wheel 3 constitute a critical flow Venturi nozzle. By adjusting the hand wheel 4 and cooperating with the indicator needle 26 and the spring positioning pin 5, the throat wheel 3 can be turned to select different throat holes 31 to cooperate with the contracting flow channel 11 and the diverging flow channel 21 to obtain different throat openings. Orif...

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Abstract

A critical flow venturi nozzle with a throat rotating wheel and with the adjustable throat area comprises an upstream contraction section, a downstream expansion section and the throat rotating wheel which is arranged between the upstream contraction section and the downstream expansion section in a wrapped mode. The throat rotating wheel is provided with throat holes of different diameters, and a contraction flow channel of the upstream contraction section, an expansion flow channel of the downstream expansion section and the throat holes in the throat rotating wheel form the critical flow venturi nozzle. The throat rotating wheel rotates through an adjusting hand wheel, so that different throat holes are selected to be matched with the contraction flow channel and the expansion flow channel, and accordingly the throat area of the critical flow venturi nozzle is changed. The position of a throat can be determined precisely under the combined effect of the adjusting hand wheel and a spring positioning pin, and therefore the throat area can be determined. The critical flow venturi nozzle can achieve on-line adjusting of critical flow conveniently without cutting off flow, and has the advantages of being wide in flow adjusting range, good in fluid flowing performance, high in flow control precision, simple in structure, reliable in performance, applicable to high-temperature and high-pressure fluid, and the like.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/42
Inventor 张兴凯王栋郭省学刘明逯国成王帅卫鹏凯杨杨
Owner XI AN JIAOTONG UNIV
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