Magnetic liquid sinusoidal micro pressure generator
A magnetic liquid and generator technology, applied in the direction of measuring fluid pressure, instruments, measuring devices, etc., can solve the problems of narrow sinusoidal pressure frequency range, intolerance to impact, large volume of micro pressure generators, etc.
Inactive Publication Date: 2015-09-23
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0004] The technical problem to be solved by the present invention: In the field of micro-pressure calibration measurement, the traditional micro-pressure generator has a large volume, is not resistant to impact, and the frequency range of sinusoidal pressure is narrow, and the amplitude of the sinusoidal pressure of the existing magnetic liquid micro-pressure generator small problem
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[0017] The present invention will be further described with accompanying drawing as specific embodiment:
[0018] A magnetic liquid sinusoidal micro-pressure generator, the device comprises: a transparent acrylic tube 1, a first excitation coil 2-1, a second excitation coil 2-2, an annular permanent magnet 3, and a magnetic liquid 4.
[0019] Such as figure 1 As shown, the ring-shaped permanent magnet 3 is first fixed in the middle of the transparent acrylic tube 1, and then the magnetic liquid 4 is injected into the ring-shaped permanent magnet 3 in the middle of the transparent acrylic tube 1. Under the action of the magnetic field gradient, the magnetic liquid 4 is adsorbed on the Therefore, the transparent acrylic tube 1 is divided into two mutually independent chambers (the corresponding chamber of the first excitation coil and the corresponding chamber of the second excitation coil); finally the first excitation coil 2-1 and the second excitation coil 2 -2 are placed on...
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The invention relates to a magnetic liquid sinusoidal micro pressure generator. An annular permanent magnet (3) is fixed at the middle of a transparent acrylic tube (1); a magnetic liquid (4) is injected into the annular permanent magnet (3) at the middle of the transparent acrylic tube (1); the magnetic liquid (4) is adsorbed in the annular permanent magnet (3) and divides the transparent acrylic tube (1) into a left independent cavity and a right independent cavity; a first excitation coil (2-1) and a second excitation coil (2-2) respectively sleeve and are fixed to positions on the transparent acrylic tube (1) which are symmetrical to each other with respect to the annular permanent magnet (3); with the sinusoidal variation of the inner current of the first excitation coil (2-1) and the second excitation coil (2-2), the magnetic liquid (4) is forced to vibrate in the transparent acrylic tube (1) according to a frequency the same as the sinusoidal current, so that two sinusoidal micro pressures which differ by 1 / 2 period can be generated at cavities at two ends of the transparent acrylic tube (1). The sinusoidal micro pressure generator has the advantages of small size, impact resistance and wide frequency range.
Description
technical field [0001] The invention belongs to the field of micro-pressure generators, and is particularly suitable for micro-pressure calibration and measurement. Background technique [0002] The accurate measurement of micro-pressure difference plays a vital role in the fields of industry, medical treatment, aerospace and other fields, which puts forward higher requirements for the accuracy and dynamic response characteristics of micro-pressure difference sensors. Especially in the pharmaceutical field, the micro-pressure difference of a few Pa affects the cleanliness of the manufacturing workshop, determines the quality of the drug, and is related to the safety of human medicine. Therefore, it is particularly important to dynamically calibrate the micro-pressure difference sensor. Among them, the sinusoidal pressure signal is the most commonly used periodic signal in dynamic pressure calibration. Traditional micro-pressure generators often generate micro-pressure in a...
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Inventor 李德才谢君
Owner BEIJING JIAOTONG UNIV