High-precision flow servo control valve

Abstract

The invention discloses a high-precision flow servo control valve applicable to a liquid pipeline. The high-precision flow servo control valve comprises a servo motor, a ball screw, an adjusting taper and a combined seam type venturi tube. The control valve is compact in design; due to design of the size of the combined seam type venturi tube, the flow variation and the linearity of the stroke of the adjusting taper are optimized, the precision and the stability of flow control are improved, and the control precision is also improved due to the data processing characteristics of a Dsp mainboard. The venturi tube and a valve body are made of high-strength corrosion-resistant stainless steel, a valve element is made of a copper alloy and is sealed by a nitrile rubber pad, and a limiting block is made of LY12 aluminum alloy. Due to adoption of the combined seam type venturi tube, when the inlet pressure varies within a range of 3-10MPa and the hydrogen peroxide output flow is greater than 100 g / s, the error can be controlled to be within a range of 0.1%, and the flow stability of an aerial conveying system can be ensured.

Description

technical field [0001] The control valve designed in the present invention is specifically a high-precision flow servo control valve. Background technique [0002] The flow control valve controls the flow of the orifice by changing the liquid resistance of the orifice under a certain inlet pressure to ensure that the flow of circulation meets the design requirements. [0003] In the field of rocket propulsion, the flow control valve is used to adjust the flow of oxidizer and fuel in the storage tank to the combustion chamber. Due to the requirements of variable thrust of the rocket, it is necessary to control the supply flow to achieve the expected function. If the adjustment of the flow rate fails to meet certain requirements, it will affect the design performance of the rocket engine. [0004] For the extrusion solid-liquid rocket engine delivery system, the flow control is generally performed through the venturi tube, but because the working principle of the venturi tube...

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Problems solved by technology

[0003] In the field of rocket propulsion, the flow control valve is used to adjust the flow of oxidizer and fuel in the storage tank to the combustion chamber. Due to the requirements of variable thrust of the rocket, it is necessary to control the supply flow to achieve the expected function. If the If the adjustment of the flow rate fails to meet certain requirements, it will affect the design performance of the rocket engine

[0004] For the extrusion solid-liquid rocket engine delivery system, the flow control is generally performed through the venturi tube, but because the working principle of the venturi tube is to control the flow rate through the pressure difference between the upstream and downstream, although the pressure difference between the upstream and downstream can generally be controlled Controlled by a certain structure, but the precision is not high

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