Micro-differential-pressure magnetic liquid sensor with high sensitivity
A micro differential pressure sensor, magnetic liquid technology, applied in the pressure difference measurement between multiple valves, measuring fluid pressure, instruments, etc., can solve the problem of miniaturization of magnetic liquid micro differential pressure sensor, increase sensor power consumption, etc. question
Inactive Publication Date: 2014-01-29
BEIJING JIAOTONG UNIV
View PDF5 Cites 13 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Since the inductance of the existing magnetic liquid micro-pressure difference sensor changes very little, the output voltage signal needs to be multi-stage amplified to facilitate observation. Since the amplifying circuit also needs to be powered separately, this increases the power consumption of the sensor on the one hand, and on the other hand It is not conducive to the miniaturization of magnetic liquid differential pressure sensor
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0021] The present invention will be further explained by taking the drawings as specific embodiments:
[0022] A high-sensitivity magnetic liquid micro-pressure difference sensor, the device includes: upper arm coil 1-1 and lower arm coil 1-2, cylindrical composite magnetic core 2, magnetic liquid 3, U-shaped organic glass tube 4, rubber stopper 5 , Pressure gauge 6, the first fixed value resistor R1, the second fixed value resistor R2, AC power supply U and voltmeter V.
[0023] The high-strength enameled copper wire is evenly wound with equal turns and is wound on the upper and lower parts of the U-shaped organic glass tube in a positive connection to form the upper arm coil 1-1 and the lower arm coil 1-2. The distance between the two coils is equal to the cylindrical composite The length of magnetic core 2, cylindrical composite magnetic core such as figure 2 Shown. After injecting the magnetic liquid into the U-shaped plexiglass tube 4, put the cylindrical composite magnetic...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a micro-differential-pressure magnetic liquid sensor with high sensitivity, and is applicable to the field of micro-pressure measurement. The micro-differential-pressure magnetic liquid sensor comprises an upper arm coil (1-1), a lower arm coil (1-2), a cylindrical composite magnetic core (2), magnetic liquid (3), a U-shaped organic glass tube (4), a rubber plug (5), a pressure gauge (6), a first fixed resistor (R1), a second fixed resistor (R2), an alternating-current power source (U) and a voltmeter (V). An enamelled copper wire is uniformly wound on the upper portion and the lower portion of one side of the U-shaped organic glass tube by using equal number of turns and in a forward connection mode, and is connected to two ends of the alternating-current power source in parallel after being serially connected with the fixed resistor (R1) and the fixed resistor (R2). After being filled with the magnetic liquid, the cylindrical composite magnetic core is placed in a tube on one side of a U-shaped tube winding coil, the rubber plug is plugged in the cylindrical composite magnetic core, and an opening end on one side of the U-shaped tube winding coil is connected with a pressure source P and the pressure gauge. When the cylindrical composite magnetic core moves in the coil, voltage values can be obviously observed without the aid of an amplifying circuit, power consumption is reduced, and the sensor is miniaturized.
Description
Technical field [0001] The invention belongs to a magnetic liquid micro pressure difference sensor, and is particularly suitable for the field of micro pressure difference measurement. Background technique [0002] At present, the research of the magnetic liquid micro-pressure sensor is still in the experimental stage in our country. The principle is as follows: the U-shaped plexiglass tube is filled with magnetic liquid, the two arms are wound with coils and connected to alternating current, and the external circuit resistance forms a bridge circuit with pressure During the differential action, the liquid level of the two arms of the U-shaped organic glass tube produces a height difference Δh, and then the coil inductance L changes, and the bridge balance is destroyed. The voltage change measured by the external circuit is used to obtain the pressure difference change. [0003] Since the inductance of the existing magnetic liquid micro-pressure sensor changes very little, the outp...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01L13/04
Inventor 李德才谢君
Owner BEIJING JIAOTONG UNIV