CN101915637B - Sinusoidal gas micro-pressure generator - Google Patents
Sinusoidal gas micro-pressure generator Download PDFInfo
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- CN101915637B CN101915637B CN2010102353480A CN201010235348A CN101915637B CN 101915637 B CN101915637 B CN 101915637B CN 2010102353480 A CN2010102353480 A CN 2010102353480A CN 201010235348 A CN201010235348 A CN 201010235348A CN 101915637 B CN101915637 B CN 101915637B
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Abstract
The invention discloses a sinusoidal gas micro-pressure generator. The generator is characterized by comprising a U-shaped tube, wherein an excitation coil is sleeved outside the bottom tube of the U-shaped tube; an upper permanent magnet is arranged above the excitation coil, while a lower permanent magnet is arranged under the excitation coil, and the excitation coil is connected with an alternating current power supply through a lead wire; and magnetic fluid is filled in the bottom tube of the U-shaped tube, and is full of the bottom tube diameter of the U-shaped tube under the action of the magnetic force of the permanent magnets. The generator has the advantages of low waveform deviation factor, simple structure and easy control.
Description
Technical field
The present invention relates to the gaseous tension generator, be specially a kind of sinusoidal gas micro-pressure generator based on magnetic liquid.
Background technology
Existing gaseous tension generator comprises that mainly outlet modulation system sinusoidal pressure generator, standing wave cast pressure alternator, cavity volume adjustable type pressure generator etc. are several, they all are the wave form varies by mechanical motion control output pressure, but its irregularity of wave form is bigger, and complex structure, the cost height, wayward waveform and amplitude.
Existing magnetic liquid sinusoidal pressure generator is (referring to document: B.
Dynamic calibration of manometer systems, Medical and Biological Engineering, 1976.3 the pressure gauge system dynamic calibration, medical science and bioengineering) be the equipment that medical experiment is used, by the pressure signal source of solid dielectric output.Its structure is for adding magnetic liquid in test tube, water is sealed the centre position of magnetic liquid at test tube, the probe of pressure transducer is inserted in the water, magnetic liquid outside winding around, power up miscarriage magnetisation field by coil, thereby magnetic liquid is subjected to magnetic field force and produces pressure, passes to sensor probe by water, and the sinusoidal pressure peak-to-peak value maximum of its generation is no more than the pressure of 1mmHg (being 133Pa).This structure is mainly used in the medical science aspect and measures the physiological pressure transducer frequency response.It exists major defect to be: produce the liquid sinusoidal pressure because magnetic liquid promotes hydraulic pressure, the damping of water is apparent in view, and the sinusoidal pressure that is produced is smaller, and irregularity of wave form is bigger; The medium of directly contact is a water because pressure transducer is popped one's head in simultaneously, so the use of detecting sensor is very limited.
Summary of the invention
At the deficiencies in the prior art, the technical matters that quasi-solution of the present invention is determined is, a kind of sinusoidal gas micro-pressure generator is proposed, the input signal of this micro-pressure generator is a coil current, promptly use the output of Current Control micro-pressure generator, have simple in structure, with low cost, characteristics such as the frequency of the sinusoidal pressure signal that is produced and size are easy to control, and wave form distortion is little.
The technical scheme that the present invention solve the technical problem is: design a kind of sinusoidal gas micro-pressure generator, it is characterized in that this generator comprises a U type pipe, the outer magnetizing coil of suit of the bottom tube of U type pipe, permanent magnet is installed above the magnetizing coil, permanent magnet is installed down below the magnetizing coil, and magnetizing coil is connected with AC power through lead; In the bottom tube of described U type pipe magnetic liquid is housed, and magnetic liquid radially is full of the bottom caliber of U type pipe under the effect of permanent magnet field power.
Compared with prior art, the minute-pressure power of sinusoidal gas micro-pressure generator of the present invention produces without any need for mechanical motion, but utilize magnetic liquid to have two kinds of performances of flowability of magnetic and liquid simultaneously, with permanent magnet as direct current biasing magnetic field, limit the shape and the position of magnetic liquid, and can guarantee that magnetic liquid radially is full of U type pipe, adopt drive coil to apply magnetic field, making magnetic liquid be subjected to magnetic field force moves in magnetic field, thereby promote air and produce little air pressure, simple in structure, with low cost; With the control signal of electric current as pressure output, be easy to regulating frequency and amplitude, the distortion of gaseous tension output waveform is little, can realize the output of low frequency minute-pressure power.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention;
Fig. 2 is the permanent magnet field structural representation of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention;
Fig. 3 produces the magnetic direction synoptic diagram for the coil of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention;
Fig. 4 is pressure waveform and the spectrogram of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention when frequency is 0.1Hz;
Fig. 5 is pressure waveform and the spectrogram of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention when frequency is 35Hz;
Fig. 6 is pressure waveform and the spectrogram of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention when frequency is 100Hz;
Fig. 7 tests gained pressure amplitude figure for a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention under different frequency;
Fig. 8 is the irregularity of wave form figure of a kind of embodiment of sinusoidal gas micro-pressure generator of the present invention under different frequency.
Embodiment
Further narrate the present invention below in conjunction with embodiment and accompanying drawing thereof:
The sinusoidal gas micro-pressure generator of the present invention's design (is called for short generator, referring to Fig. 1-8), it is characterized in that this generator comprises a U type pipe 1, the bottom tube of U type pipe 1 is set with a magnetizing coil 2 outward, permanent magnet 4 is installed above the magnetizing coil 2, permanent magnet 5 is installed down below the magnetizing coil 2, and magnetizing coil 2 is connected with AC power 6 through lead 7; In the bottom tube of described U type pipe 1 magnetic liquid 3 is housed, and magnetic liquid 3 radially riddles the bottom caliber of U type pipe 1 under the effect of permanent magnet field power.
Principle of work of the present invention is: the magnetic liquid 3 of in the bottom tube of U type pipe 1, packing into, need be full of the radial section of U type pipe 1, and because magnetic liquid 3 has flowability, simply packing into to make it be full of U type pipe 1.In order to allow magnetic liquid 3 radially be full of in U type pipe 1, permanent magnet 4 and 5 generations of following permanent magnet are along the radial magnetic field B of U type pipe 1 bottom in the employing
0(referring to Fig. 2), magnetic liquid 3 radially riddle under the effect of permanent magnet field power in the bottom caliber of U type pipe 1.The pipe of described U type pipe 1 is around with magnetizing coil 2, and magnetizing coil 2 is connected with AC power 6 through lead 7, and 6 pairs of magnetizing coils 2 of AC power apply sinusoidal current, produces sinusoidal magnetic field B (t), and magnetic direction is axial (referring to the Fig. 3) along U type pipe 1 bottom.The sinusoidal magnetic field B (t) that magnetizing coil 2 produces acts on magnetic liquid 3, make magnetic liquid 3 be subjected to the effect of axial sinusoidal magnetic field power and axially-movable, and then pressurized air produces sinusoidal little air pressure, and sinusoidal little air pressure is from a port 8 and 9 outputs of another port of U type pipe 1.Two ports of described U type pipe 1 link to each other with detecting sensor by flexible pipe.
Generator of the present invention is based on magnetic liquid 3, utilize magnetic liquid 3 to have flowability two specific characters of magnetic and liquid 3 simultaneously, adopt upper and lower permanent magnet 4 and 5 to limit the shape and the position of magnetic liquid 3 in the U type pipe 1, and produce magnetic fields with drive coil 2, apply magnetic field force, make magnetic liquid 3 magnetic field force induced effects and in magnetic field, move, thereby the air that promotes in the U type pipe 1 produces little air pressure (sinusoidal gas micro-pressure).
Under laboratory condition, generator of the present invention is tested: it is 60mA that institute adds the electric current amplitude, experimental result pressure waveform under three typical frequencies is (referring to Fig. 4,5,6) as shown in the figure respectively, and the first half of every width of cloth figure is time domain waveform figure, and the latter half is a spectrogram.The result of pressure generator output when Fig. 4 is 0.1Hz for frequency, last half range figure is the sinusoidal pressure waveform, following half range figure is the spectrogram of output pressure; The result of pressure generator output when Fig. 5 is 35Hz for frequency, last half range figure is the sinusoidal pressure waveform, following half range figure is the spectrogram of output pressure; The result of pressure generator output when Fig. 6 is 100Hz for frequency, last half range figure is the sinusoidal pressure waveform, following half range figure is the spectrogram of output pressure.Fig. 7 has then provided the pressure wave amplitude that produces under different frequency.
From above-mentioned experimental result as can be seen, it is 0.1Hz～100Hz that generator of the present invention can produce frequency, and maximum amplitude is the sinusoidal minute-pressure power of 770Pa.According to experimental result, calculate the irregularity of wave form of sinusoidal pressure generator, when its maximum irregularity of wave form is created in frequency 100Hz, be 4.7%; When minimum irregularity of wave form is created in frequency 35Hz, be 0.28%; The average waveform aberration rate is 1.8% (referring to Fig. 8).The irregularity of wave form of the outlet modulation system gaseous tension generator of prior art is 3%, laser interference formula high-frequency pressure generator irregularity of wave form is 1～10%, the gaseous tension generator irregularity of wave form of Great Wall, Beijing metrological testing technology Research Institute is 3%, as seen the sinusoidal pressure that generator of the present invention produced is not only bigger, and wave form distortion is lower than prior art, and generator architecture of the present invention is simple, with low cost simultaneously, control has clear superiority easily.
The dynamic calibration that generator of the present invention is mainly used in to pressure transducer provides the sinusoidal pressure signal source.
The present invention does not address part and is applicable to prior art.
Claims (1)
1. sinusoidal gas micro-pressure generator, it is characterized in that this generator comprises a U type pipe, the outer magnetizing coil of suit of the bottom tube of U type pipe, permanent magnet is installed above the magnetizing coil, permanent magnet is installed down below the magnetizing coil, and magnetizing coil is connected with AC power through lead; In the bottom tube of described U type pipe magnetic liquid is housed, and magnetic liquid radially is full of the bottom caliber of U type pipe under the effect of permanent magnet field power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102353480A CN101915637B (en) | 2010-07-23 | 2010-07-23 | Sinusoidal gas micro-pressure generator |
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| CN2010102353480A CN101915637B (en) | 2010-07-23 | 2010-07-23 | Sinusoidal gas micro-pressure generator |
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| CN101915637A CN101915637A (en) | 2010-12-15 |
| CN101915637B true CN101915637B (en) | 2011-10-26 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162896B (en) * | 2013-03-15 | 2015-06-10 | 北京交通大学 | High-sensitivity magnetic liquid micro-pressure difference sensor |
| CN103542976B (en) * | 2013-10-09 | 2015-10-28 | 北京交通大学 | A kind of Magnetofluid low-frequency micro differential pressure sensor |
| CN103542975B (en) * | 2013-10-09 | 2015-11-18 | 北京交通大学 | A kind of highly sensitive magnetic-liquid micro differential pressure sensor |
| CN103604558B (en) * | 2013-11-28 | 2015-10-28 | 北京交通大学 | A kind of magnetic-liquid micro differential pressure sensor |
| CN104931196B (en) * | 2015-06-12 | 2017-04-05 | 北京交通大学 | A kind of magnetic liquid sine minute-pressure generator |
| US10498001B2 (en) | 2017-08-21 | 2019-12-03 | Texas Instruments Incorporated | Launch structures for a hermetically sealed cavity |
| US10444102B2 (en) * | 2017-09-07 | 2019-10-15 | Texas Instruments Incorporated | Pressure measurement based on electromagnetic signal output of a cavity |
| CN108318180B (en) * | 2018-04-09 | 2023-05-12 | 河北工业大学 | Contact type magnetic liquid sine pressure generator |
| CN108982008B (en) * | 2018-09-10 | 2020-07-07 | 中国航空工业集团公司北京长城计量测试技术研究所 | Double-element combined high-frequency sinusoidal pressure generator and pressure generating method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201155999Y (en) * | 2007-12-03 | 2008-11-26 | 北京康斯特仪表科技有限公司 | Automatic micro-pressure generator |
| DE102009027624A1 (en) * | 2008-07-10 | 2010-01-14 | Huber, Karl, Prof. Dr. | Pressure sensor i.e. cylinder pressure sensor, calibrating device for use in internal combustion engine, has electrical drive for producing or dynamic test pressure in testing chamber by acting on piston |
| CN101769814A (en) * | 2008-12-26 | 2010-07-07 | 中国航空工业第一集团公司北京长城计量测试技术研究所 | Dynamic pressure calibrator based on piezoelectric ceramic technology |
| CN201716152U (en) * | 2010-07-23 | 2011-01-19 | 河北工业大学 | Sinusoidal gas micropressure generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4604891A (en) * | 1984-10-17 | 1986-08-12 | The Foxboro Company | Reference pressure devices for calibrating pressure-measuring instruments |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201155999Y (en) * | 2007-12-03 | 2008-11-26 | 北京康斯特仪表科技有限公司 | Automatic micro-pressure generator |
| DE102009027624A1 (en) * | 2008-07-10 | 2010-01-14 | Huber, Karl, Prof. Dr. | Pressure sensor i.e. cylinder pressure sensor, calibrating device for use in internal combustion engine, has electrical drive for producing or dynamic test pressure in testing chamber by acting on piston |
| CN101769814A (en) * | 2008-12-26 | 2010-07-07 | 中国航空工业第一集团公司北京长城计量测试技术研究所 | Dynamic pressure calibrator based on piezoelectric ceramic technology |
| CN201716152U (en) * | 2010-07-23 | 2011-01-19 | 河北工业大学 | Sinusoidal gas micropressure generator |
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| 张依群等.正弦液压发生器的研制.《医疗器械》.1984,第8卷(第2期),第7－11页. * |
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