CN202676356U - Micro differential pressure sensing test apparatus - Google Patents
Micro differential pressure sensing test apparatus Download PDFInfo
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- CN202676356U CN202676356U CN 201220171328 CN201220171328U CN202676356U CN 202676356 U CN202676356 U CN 202676356U CN 201220171328 CN201220171328 CN 201220171328 CN 201220171328 U CN201220171328 U CN 201220171328U CN 202676356 U CN202676356 U CN 202676356U
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- 239000007788 liquid Substances 0.000 claims abstract description 33
- 230000005284 excitation Effects 0.000 claims abstract description 15
- 230000001939 inductive effect Effects 0.000 claims description 19
- 230000005684 electric field Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000007789 sealing Methods 0.000 abstract description 5
- 239000011553 magnetic fluid Substances 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000006698 induction Effects 0.000 abstract 1
- 230000005389 magnetism Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
A micro differential pressure sensing test apparatus mainly comprises an air pressure gauge, a sealing ring, a cylinder, a piston, a flange, a sawtooth nut, a rotary handle, a sawtooth screw, an air pipe, a sealing plug, an excitation power supply, a U-shaped pipe, magnetic liquid, an excitation coil, an induction coil and a voltmeter. The apparatus uses the work principle of a solenoid-type differential transformer, the core part of which is a variable mutual inductor, and as magnetic fluid has both magnetism and fluidity, the measurement of the micro differential pressure is achieved by the change of the mutual inductance of the coils while the magnetic fluid flowing. Based on the high sensitivity and linearity of the magnetic liquid, the micro differential pressure sensing test apparatus can accurately measure a micro differential pressure within a range of +/-1000 Pa.
Description
Technical field
The utility model relates to a kind of micro-pressure-difference sensing test unit, especially based on the micro-pressure-difference sensing test unit of magnetic liquid.
Background technology
Along with the development of Modern Transducer Technology, micro-pressure sensor is more and more extensive in the application of the high-acruracy survey occasions such as micro-flow measurement, leakage test, sealing propertytest.At present, micro-pressure sensor mainly is two kinds of pressure resistance type and condenser types, accurate control problem based on micron order strain films thickness, and manufacture difficulty is large, lack of homogeneity, cost is high present situation again, and the micro-pressure-difference sensing test unit of developing a kind of low cost, high precision, excellent performance has a good application prospect.In recent years, the researchist began magnetic liquid is studied both at home and abroad, and it is widely used in magnetic fluid sealing, magnetic liquid damper, magnetic liquid sensor field.And the introducing of this new function material magnetic liquid, for the research and development of micro-pressure-difference sensing device provide new opportunity, the monopolizing characteristic that relies on this material, can produce have high linearity, the magnetic liquid micro-pressure-difference sensing device of high sensitivity, simple in structure, the advantage such as cost is low and the life-span is long.From present searchable domestic and foreign literature data, find, the magnetic liquid micro-pressure-difference sensing device of domestic practicality is not also succeeded in developing, and existing research does not have accurate pressure setter, and it is significant therefore to develop a magnetic liquid micro-pressure-difference sensing test unit with accurate pressure setter.
The utility model content
In order to realize the precision measurement of micro-pressure-difference, the utility model provides a kind of micro-pressure-difference sensing test unit, what adopt is the principle of work of solenoid type differential transformer, its core is variable mutual inductance, utilize the magnetic liquid physical efficiency to produce the character of induced field, the variation of coil mutual inductance realizes the measurement of micro-pressure-difference when flowing by magnetic liquid.
The technical scheme that its technical matters that solves the utility model adopts is: micro-pressure-difference sensing test unit is comprised of accurate pressure setter and micro-pressure-difference measurement mechanism two parts, mainly comprises rain glass, O-ring seal, cylinder, piston, flange, the sawtooth nut, swing handle, sawtooth screw rod, tracheae, sealing-plug, excitation power supply, the U-shaped pipe, magnetic liquid, drive coil, inductive coil, voltage table.
Accurately the pressure setter is by rain glass, cylinder, and piston, O-ring seal, flange, the sawtooth nut, swing handle, the sawtooth screw rod, tracheae connects to form.It is characterized in that described rain glass is located at cylinder bottom, be used for the preliminary survey atmospheric pressure value.Described cylinder top is provided with the sawtooth nut, and the sawtooth nut is equipped with the sawtooth screw rod, to realize the transmission self-locking of sawtooth nut and sawtooth screw rod.Described sawtooth screw rod one end is installed swing handle, and screw rod is rotated; The other end is fixed on the piston by flange, moves up and down in cylinder so that can drive piston during bolt rotary.Described piston is provided with O-ring seal, the Leakage Gas when preventing the piston feeding.Described tracheae one end connects cylinder bottom, and the other end passes into the U-shaped pipe through sealing-plug, realizes that cylinder air pressure is to the transmission of U-shaped pipe.
The micro-pressure-difference measurement mechanism mainly is comprised of U-shaped pipe and metering circuit, comprises sealing-plug, U-shaped pipe, magnetic liquid, drive coil, inductive coil, excitation power supply, voltage table.In the described U-shaped pipe a certain amount of magnetic liquid is arranged, magnetic liquid has superparamagnetism, with it as magnetic core.Described sealing-plug is installed on the U-shaped pipe, can be so that U-shaped Guan Yiduan air pressure and cylinder internal gas pressure are equal.Described U-shaped pipe two ends are close coaxial coil around two equal in length evenly, the number of turn of two Inside coils is N1, the number of turn of two external coils is N2, and the Inside coil at two ends is connected as drive coil, and the external coil differential concatenation at two ends is as inductive coil.Described metering circuit is comprised of exciting circuit and sensor circuit.Described exciting circuit is connected to form by excitation power supply and drive coil, described excitation power supply is connected with two drive coils, so that described drive coil produces excitation field, utilize the superparamagnetism of magnetic liquid in the U-shaped pipe, can be so that the magnetic field of magnetic liquid conduction be more stable.Described sensor circuit is connected to form by inductive coil and voltage table, described inductive coil induces electric field from the magnetic field of magnetic liquid conduction, described voltage table is connected with two inductive coils, and it is poor to be used for measuring the inductive coil both end voltage, thereby calculates the atmospheric pressure value of input.
The utility model micro-pressure-difference sensing test unit adopts the principle of work of solenoid type differential transformer, its core is variable mutual inductance, the characteristics of utilizing magnetic fluid to have magnetic and flowability concurrently realize the measurement of micro-pressure-difference, high sensitivity and high linearity based on magnetic liquid, micro-pressure-difference sensing test unit is simple in structure, can accurately measure ± the interior small pressure reduction of 1000pa scope.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is the one-piece construction synoptic diagram of the utility model micro-pressure-difference sensing test unit.
Fig. 2 is the schematic equivalent circuit of the utility model micro-pressure-difference sensing test unit.
1. rain glasss among this figure, 2. O-ring seal, 3. cylinder, 4. piston, 5. flange, 6. sawtooth nut, 7. swing handle, 8. sawtooth screw rod, 9. tracheae, 10. sealing-plug, 11. excitation power supply, 12.U shape pipe, 13. magnetic liquids, 14. drive coil, 15. inductive coils, 16. voltage tables, U1 is driving voltage, and U2 is induced electricity pressure reduction, and R1, R2 are the effective resistance of coil.
Embodiment
As shown in Figure 1, the utility model micro-pressure-difference sensing test unit mainly comprises rain glass 1, O-ring seal 2, cylinder 3, piston 4, flange 5, sawtooth nut 6, swing handle 7, sawtooth screw rod 8, tracheae 9, sealing-plug 10, excitation power supply 11, U-shaped pipe 12, magnetic liquid 13, drive coil 14, inductive coil 15, voltage table 16.Described rain glass 1 is located at cylinder 3 bottoms; Described cylinder 3 tops are provided with sawtooth nut 6; Described sawtooth nut 6 is equipped with sawtooth screw rod 8; Described sawtooth screw rod 8 one ends are installed swing handle 7, and the other end is fixed on the piston 4 by flange 5; Described piston is provided with O-ring seal 10; Described tracheae 9 one ends connect cylinder 3 bottoms, and the other end connects sealing-plug 10; Described sealing-plug 10 is installed on U-shaped pipe 12; In the described U-shaped pipe 12 certain magnetic liquid 13 is arranged; Described U-shaped pipe is provided with sealing-plug 10; Described U-shaped pipe 12 two ends are close coaxial coil around two equal in length evenly, and the Inside coil at two ends is connected as drive coil 14, and the external coil differential concatenation at two ends is as inductive coil 15; Described excitation power supply 11 is connected with two drive coils 14; Described voltage table 16 is connected with two inductive coils 15.
During work, at first slowly rotate swing handle 7,8 rotations of sawtooth screw rod move down, promoting flange 5 and piston 4 moves down, under the effect of O-ring seal 2 and piston 4, cylinder 3 internal gas pressures raise, and enter U-shaped pipe 12 so that gas is compressed through tracheae 9, after the magnetic liquid 13 formation certain altitudes in the U-shaped pipe 12 are poor, the swing handle 7 that stops operating, at this moment, sawtooth nut 6 and sawtooth screw rod 8 form self-lockings, piston 4 and O-ring seal 2 are static, and it is constant that cylinder 3 internal gas pressures keep.Because the sealing function of sealing-plug 10, the air pressure that is filled with in the U-shaped pipe 12 keep constant and equal air pressure in the cylinder 3, i.e. the atmospheric pressure value of 1 estimation amount of rain glass.Then, open excitation power supply 11, so that drive coil 14 produces induced field in magnetic liquid 13, inductive coil 15 induces electric field in the magnetic field of magnetic liquid 13 simultaneously, and voltage table 16 is measured the magnitude of voltage that inductive coil 15 produces in sensor circuit.
As shown in Figure 2, the schematic equivalent circuit of the utility model micro-pressure-difference sensing test unit, after the magnetic liquid 13 in the U-shaped pipe 12 produces difference in height, driving voltage U1 input stimulus circuit, drive coil 14 energisings produce excitation field.At this moment, the magnetic field that produces of the poor magnetic liquid of height of formation 13 conduction drive coils 14 in the U-shaped pipe 12.At this moment, inductive coil 15 induces electric field from the magnetic field of magnetic liquid 13 conduction, come the atmospheric pressure value of the accurate pressure setter generation of analytical calculation by the induced electricity pressure reduction U2 in the measurement sensor circuit, the atmospheric pressure value of surveying with rain glass 1 compares, and measured error can be accurate to ± 1000pa.
Claims (5)
1. a micro-pressure-difference sensing test unit is characterized in that, mainly comprises tensimeter (1), O-ring seal (2), cylinder (3), piston (4), flange (5), sawtooth nut (6), swing handle (7), sawtooth screw rod (8), tracheae (9), sealing-plug (10), excitation power supply (11), U-shaped pipe (12), magnetic liquid (13), drive coil (14), inductive coil (15), voltage table (16).
2. a kind of micro-pressure-difference sensing test unit according to claim 1, it is characterized in that described cylinder (3) cylinder body top is provided with sawtooth nut (6), sawtooth nut (6) is equipped with sawtooth screw rod (8), can realize the transmission self-locking of sawtooth nut (6) and sawtooth screw rod (8).
3. a kind of micro-pressure-difference sensing test unit according to claim 1 is characterized in that a certain amount of magnetic liquid (13) is arranged in the described U-shaped pipe (12), and magnetic liquid (13) has superparamagnetism, with it as magnetic core.
4. a kind of micro-pressure-difference sensing test unit according to claim 1, it is characterized in that evenly close coaxial coil around two equal in length of described U-shaped pipe (12) two ends, the number of turn of two Inside coils is N1, the number of turn of two external coils is N2, the Inside coil at two ends is connected as drive coil (14), and the external coil differential concatenation at two ends is as inductive coil (15); Described drive coil (14) produces excitation field under the effect of excitation power supply (11), described inductive coil (15) is for the electric field in the magnetic field that induces the inner magnetic liquid of U-shaped pipe (12) (13) generation.
5. a kind of micro-pressure-difference sensing test unit according to claim 1, it is characterized in that described voltage table (16) is connected with two inductive coils (15), be used for measuring the voltage difference at inductive coil (15) two ends, thereby calculate the force value of input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220171328 CN202676356U (en) | 2012-04-13 | 2012-04-13 | Micro differential pressure sensing test apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220171328 CN202676356U (en) | 2012-04-13 | 2012-04-13 | Micro differential pressure sensing test apparatus |
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| CN202676356U true CN202676356U (en) | 2013-01-16 |
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| CN 201220171328 Expired - Fee Related CN202676356U (en) | 2012-04-13 | 2012-04-13 | Micro differential pressure sensing test apparatus |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175650A (en) * | 2013-03-15 | 2013-06-26 | 北京交通大学 | Method for improving sensitivity of magnetic liquid micro differential pressure sensor |
| CN103196621A (en) * | 2013-03-14 | 2013-07-10 | 北京交通大学 | Anti-overflow device of magnetic liquid micro differential pressure transducer |
| CN103604558A (en) * | 2013-11-28 | 2014-02-26 | 北京交通大学 | Magnetic-liquid micro differential pressure sensor |
| CN104006916A (en) * | 2014-05-30 | 2014-08-27 | 北京交通大学 | Mutual inductance type magnetic liquid micro-differential-pressure sensor |
| CN104198109A (en) * | 2014-09-11 | 2014-12-10 | 北京交通大学 | Magnetic-liquid micropressure differential sensor with branch tube |
| CN104748908A (en) * | 2015-04-15 | 2015-07-01 | 中国石油大学(北京) | Micro-differential-pressure metering device for high-pressure experiment |
| CN109682504A (en) * | 2019-01-04 | 2019-04-26 | 三峡大学 | The device and method of magnetic force utricule measurement crustal stress |
| CN110044542A (en) * | 2019-04-03 | 2019-07-23 | 北京交通大学 | A kind of inductance type magnetic liquid micro-pressure sensor based on slider-crank mechanism |
| RU2733827C2 (en) * | 2018-05-04 | 2020-10-07 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Юго-Западный государственный университет" (ЮЗГУ) | Method of controlling physical and mechanical properties of a magnetic fluid by displacement and oscillation thereof in a column in a magnetic field and a device for carrying out said method |
| CN112577661A (en) * | 2020-11-05 | 2021-03-30 | 清华大学 | Magnetic liquid micro-pressure difference sensor with elastic membrane |
| CN112577660A (en) * | 2020-11-05 | 2021-03-30 | 清华大学 | Horizontal thin tube type magnetic liquid micro differential pressure sensor |
-
2012
- 2012-04-13 CN CN 201220171328 patent/CN202676356U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196621A (en) * | 2013-03-14 | 2013-07-10 | 北京交通大学 | Anti-overflow device of magnetic liquid micro differential pressure transducer |
| CN103175650A (en) * | 2013-03-15 | 2013-06-26 | 北京交通大学 | Method for improving sensitivity of magnetic liquid micro differential pressure sensor |
| CN103175650B (en) * | 2013-03-15 | 2015-04-15 | 北京交通大学 | Method for improving sensitivity of magnetic liquid micro differential pressure sensor |
| CN103604558A (en) * | 2013-11-28 | 2014-02-26 | 北京交通大学 | 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 |
| CN104006916A (en) * | 2014-05-30 | 2014-08-27 | 北京交通大学 | Mutual inductance type magnetic liquid micro-differential-pressure sensor |
| CN104006916B (en) * | 2014-05-30 | 2017-10-31 | 北京交通大学 | A kind of mutual inductance type magnetic-liquid micro differential pressure sensor |
| CN104198109A (en) * | 2014-09-11 | 2014-12-10 | 北京交通大学 | Magnetic-liquid micropressure differential sensor with branch tube |
| CN104748908B (en) * | 2015-04-15 | 2017-02-22 | 中国石油大学(北京) | Micro-differential-pressure metering device for high-pressure experiment |
| CN104748908A (en) * | 2015-04-15 | 2015-07-01 | 中国石油大学(北京) | Micro-differential-pressure metering device for high-pressure experiment |
| RU2733827C2 (en) * | 2018-05-04 | 2020-10-07 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Юго-Западный государственный университет" (ЮЗГУ) | Method of controlling physical and mechanical properties of a magnetic fluid by displacement and oscillation thereof in a column in a magnetic field and a device for carrying out said method |
| CN109682504A (en) * | 2019-01-04 | 2019-04-26 | 三峡大学 | The device and method of magnetic force utricule measurement crustal stress |
| CN109682504B (en) * | 2019-01-04 | 2020-11-06 | 三峡大学 | Device and method for measuring ground stress by magnetic capsule |
| CN110044542A (en) * | 2019-04-03 | 2019-07-23 | 北京交通大学 | A kind of inductance type magnetic liquid micro-pressure sensor based on slider-crank mechanism |
| CN110044542B (en) * | 2019-04-03 | 2020-04-17 | 北京交通大学 | Inductance type magnetic liquid micro-differential pressure sensor based on slider-crank mechanism |
| CN112577661A (en) * | 2020-11-05 | 2021-03-30 | 清华大学 | Magnetic liquid micro-pressure difference sensor with elastic membrane |
| CN112577660A (en) * | 2020-11-05 | 2021-03-30 | 清华大学 | Horizontal thin tube type magnetic liquid micro differential pressure sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20140413 |