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Double-cavity air cylinder piston type pulsating pressure generator

A pressure generator, cylinder piston technology, applied in the direction of measuring fluid pressure, instruments, measuring devices, etc., can solve the problem of unable to generate pulsating pressure, achieve the effect of increasing amplitude, increasing pressure amplitude, and reducing waveform distortion

Pending Publication Date: 2022-04-26
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the initial pressure is high or close to a vacuum, it is impossible to generate a well-shaped pulsating pressure

Method used

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  • Double-cavity air cylinder piston type pulsating pressure generator

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Embodiment 1

[0026] Such as figure 1 As shown, this embodiment discloses a double-cavity cylinder piston type pulsating pressure generator, including a vibrating table 1, a base 2, a cylinder 3, a piston 5, an air pressure source 10, an air circuit 9 and a valve. The cylinder 3 is installed on the base 2, the edge of the piston 5 is dynamically sealed with the inner wall of the cylinder 3, and the hole under the piston 5 is dynamically sealed with the cylinder 3. The vibrating table 1 drives the piston 5 to move back and forth to generate sinusoidal regular pressure in the two chambers. The air pressure source 10 is connected to the cylinder 3 through the air circuit 9, and the two valves respectively control the two chambers to adjust the initial pressure in the cylinder 3, and the average value of the generated pulsating pressure covers positive pressure and negative pressure.

[0027] The two valves are valve a7 and valve b8 respectively. The two independent chambers are air chamber a...

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Abstract

The invention discloses a double-cavity air cylinder piston type pulsating pressure generator, and belongs to the technical field of dynamic pressure generation. A single cavity of the air cylinder piston type pulsating pressure generator is changed into double cavities, single-cavity pressurization (air exhaust) is changed into double-cavity simultaneous pressurization (air exhaust), the two cavities are inflated or deflated through the valve at the same time, at the moment, the pressure intensity of the two faces of the piston is equal, the piston does not bear extra resistance during reciprocating motion, and the piston is prevented from being damaged. The amplitude of the pulsating pressure generated under the positive pressure and the negative pressure is larger than that of a single-cavity air cylinder piston structure, larger vibration displacement is obtained under the condition that the thrust of the vibration table is not changed, and the pulsating pressure with the higher amplitude is generated. In addition, the phase difference of pulsating pressure signals in the two cavities is fixed to be 180 degrees. According to the invention, no extra pressure chamber structure is adopted, and meanwhile, the concave end cover is adopted; therefore, when the vibration displacement is small, the amplitude of the generated pulsating pressure can be remarkably improved. According to the invention, the pulsating pressure with the phase difference of 180 degrees for special calibration application can be generated.

Description

technical field [0001] The invention belongs to the technical field of dynamic pressure generation, and relates to a double-cavity cylinder piston type pulsating pressure generator. Background technique [0002] The pressure that changes with time is called dynamic pressure. The main purpose of dynamic pressure calibration is to determine the dynamic characteristics of the system being calibrated, and to obtain the dynamic performance index and dynamic mathematical model of the pressure sensor or pressure test system. [0003] The core of dynamic pressure calibration is the dynamic pressure excitation source. The excitation signals commonly used in dynamic pressure calibration can be divided into two types: periodic signals and non-periodic signals. The ideal excitation signal should be able to excite all the modal frequencies of the system to be calibrated in order to obtain the complete dynamic characteristics of the system to be calibrated. In engineering practice, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00
CPCG01L27/005
Inventor 李天然史博李峰蔡菁王辰辰冯玮
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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