Method for realizing pressure P-displacement characteristic of bellows vacuum capsule

Abstract

The invention discloses a method for realizing the pressure P-displacement characteristic of a bellows vacuum capsule, and aims to provide a method for realizing the pressure P-displacement characteristic of the bellows vacuum capsule, which has high structural strength and reliability and is suitable for higher environment working temperature. The invention is realized by the following technicalscheme: a single welding bellows is used as an elastic sensitive element, the pressure P-displacement W characteristic required by the vacuum capsule is converted into the uniform distribution force rigidity K'P of the vacuum capsule, the material and the elastic modulus E are determined, a dimensionless effective area is obtained, the effective area of the welding bellows vacuum capsule and the concentrated force rigidity of the welding bellows are calculated, and compared with the concentrated force rigidity of the welding bellows, the design of the welding bellows vacuum capsule is checkedto judge whether the pressure P-displacement W characteristic requirement of the vacuum capsule of the valve is met, and otherwise, according to the difference of the concentrated force rigidity Kf ofthe welding bellows vacuum capsule, the values of the wave plate thickness H, the wave number n and the wave height H are adjusted, and the calculation is redesigned.

Description

technical field [0001] The invention relates to a valve vacuum bellows applied to aircraft engine regulators, in particular to a method for realizing the pressure P-displacement W characteristic of the vacuum bellows and high-altitude valve vacuum bellows with certain internal specific structures by using welded bellows. Background technique [0002] The fuel system is an important working system of the engine. Whether it works normally will directly affect the reliability and safety of the engine and the helicopter. As the core accessory of the fuel system, the fuel regulator is the most basic flow regulator that directly regulates the fuel flow to the combustion chamber, and it is a mechanism that realizes the adjustment of the fuel supply in various states of the engine to reasonably match the working state of the engine . It is also an area with a high incidence of failure. Fuel delivery of an aeroengine fuel flow regulator under failure modes of bellows aging and vari...

AI Technical Summary

Problems solved by technology

The pressure P-displacement W characteristics required by the current design of the welded bellows vacuum bellows adopts an empirical method, that is, the size and structure of the vacuum bellows with the existing pressure P-displacement W characteristics are compared, and the parameters of the welded bellows with close dimensions are adjusted. The performance obtained by the welded bellows vacuum bellows test was made, and the parameters of the welded bellows were corrected. Repeated tests, lack of converting the pressure P-displacement W characteristics required by the valve vacuum bellows into the concentrated force stiffness that can be directly measured by the welded bellows K f Theoretical Calculation Methods for Design

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