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A low frequency-oriented pulsation pressure attenuation device and its performance testing method

A technology of pulsating pressure and attenuation devices, which is applied in the testing of mechanical components, testing of machine/structural components, and measuring devices. It can solve the problems of large volume, poor adaptability, and single attenuation frequency band of resistive filters.

Active Publication Date: 2020-05-22
BEIJING UNIV OF TECH
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Problems solved by technology

[0010] Based on the principle of structural resonance, the present invention proposes a low-frequency-oriented pulsating pressure attenuation device and its performance testing method, which utilizes the coupled vibration of the fluid medium and the elastic thin plate to effectively attenuate the pulsating pressure at the outlet of the direct drive pump under different working conditions, and Reasonable and effective evaluation of the attenuation effect of the device overcomes the shortcomings of traditional resistive filters such as large size, single attenuation frequency band and poor adaptability

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  • A low frequency-oriented pulsation pressure attenuation device and its performance testing method
  • A low frequency-oriented pulsation pressure attenuation device and its performance testing method
  • A low frequency-oriented pulsation pressure attenuation device and its performance testing method

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Embodiment Construction

[0028] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0029] Such as figure 1 , 2 As shown, a pulsating pressure attenuation device for low frequency is mainly composed of pipe joint (1), shell (2), O-ring (3), gland (4), elastic sheet (5) and hexagon socket bolt and so on. The shell is welded by stainless steel sheets and encloses the main chamber (8); round recesses with different diameters are respectively processed around the shell (2), and the elastic thin plate is placed on the recesses, and the gland (4 ), the static pressure balance cavity (6) is formed between the two, and the diameters of the elastic thin plates (5) are different, and their first-order natural frequencies are respectively the fundamental frequency to the fourth harmonic of the direct-drive pump outlet pressure pulsation The wave frequency is equal; the gland (4) is tightly connected to the shell (2) through the inner hex...

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Abstract

The invention discloses a pulsating pressure attenuating device for a low frequency and a performance testing method thereof. The attenuating device mainly comprises a pipe joint (1), a casing (2), anO-type sealing ring (3), a gland (4), elastic sheets (5) and a hexagon socket bolt. The casing is formed of a stainless steel sheet by welding and surrounds to form a main cavity (8). The gland (4) respectively surrounds to form a static pressure balance chamber (6) with the elastic sheets (5) having different diameters, and the main cavity and the static pressure balance chamber are connected through a static pressure balance hole. When a direct drive pump is operated according to the rated frequency, the pulsating pressure in the main cavity interacts with the elastic sheets. Since the fundamental frequency to the fourth harmonic frequency of the pressure pulsation is the same as the first order natural frequency of each elastic sheet, the sheets resonate and the purpose of attenuatingpulsating pressure is achieved.

Description

technical field [0001] The invention belongs to the technical field of fluid pulsation attenuation devices and performance testing thereof, and relates to a low-frequency oriented pulsation pressure attenuation device and a performance testing method thereof. Based on the principle of structural resonance, the invention proposes a pulsating pressure attenuation device and a test method for its attenuation effect. Background technique [0002] As a new type of bilge drainage pump for ships, the direct drive pump directly drives the plunger to reciprocate in the cylinder to achieve water absorption and drainage by a linear motor, which avoids the intermediate conversion device of the traditional drainage pump, improves work efficiency, and avoids Large vibration noise and pulsating flow output. Like other hydraulic systems, the vibration and noise of the direct drive pump system mainly come from mechanical vibration and noise and flow-induced vibration and noise. Among them, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00F16L55/05
CPCF16L55/05G01M13/00
Inventor 聂松林郭曰伟李芹杨浩
Owner BEIJING UNIV OF TECH
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