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Liquid level detection method and liquid level sensor

A liquid level sensor and liquid level detection technology, which is used in buoy liquid level indicators, liquid/fluid solid measurement, instruments, etc. The measurement method is concise, the effect of solving the stuck float, and the measurement accuracy is high

Active Publication Date: 2016-11-09
广东正扬传感科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this detection method is that the magnetic float must move in a fixed direction, and the guide rail-groove structure that enables the magnetic float to move in a fixed direction will easily cause the magnetic float to be stuck in a certain place of the electronic tube and cannot continue to move

Method used

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  • Liquid level detection method and liquid level sensor
  • Liquid level detection method and liquid level sensor
  • Liquid level detection method and liquid level sensor

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Effect test

Embodiment 1

[0039] The preferred embodiment discloses a liquid level detection method and a liquid level sensor for realizing the liquid level detection method. Such as figure 1 As shown, the liquid level sensor includes an electronic tube 1, in which a plurality of magnetoresistive elements 2 are sequentially arranged in the longitudinal direction, and a buoy 3 is rotatably sleeved on the outside of the electronic tube 1, and two magnets 4 are arranged on the buoy 3. The N poles of each magnet 4 are all facing the magnetoresistive element 2 or the S poles are all facing the magnetoresistive element 2; the distance between two adjacent magnetoresistive elements 2 is L, and the length of each magnet 4 is equal to 2L. Multiple magnetoresistive elements 2 are arranged at equal intervals to reduce the difficulty of measurement and calculation.

[0040] In this liquid level detection method, two magnets 4 are oppositely arranged with the same pole to form a magnetic field. When the position o...

Embodiment 2

[0075] This preferred embodiment discloses a liquid level detection method, the principle of which is basically the same as that of the preferred embodiment 1, except that only one magnetoresistive element is used for detection. The liquid level detection method comprises the following steps:

[0076] Step T1: When not affected by the magnetic field, record the output voltage value of the first magnetoresistive element 21 as V 1Initial ;

[0077] Step T2: The magnet 4 moves with the buoy 3. When the first magnetoresistive element 21 is located between the two magnets 4, this position is recorded as the current position. At this time, the output voltage value of the first magnetoresistive element 21 is recorded as V 1Current ;

[0078] Step T3: Using the output voltage value V 1Current and V 1Initial The distance H between the first reluctance element 21 and the plane where the specified position on the magnet 4 is calculated along the moving direction of the buoy 3; the sp...

Embodiment 3

[0081] This preferred embodiment discloses a liquid level sensor whose structure is basically the same as that of the liquid level sensor in the preferred embodiment 1, except that the distance between two adjacent magnetoresistive elements 2 is L, and the length of the magnet 4 is 2L, but the distance between the two magnets 4 is not 2L. The liquid level detection method corresponding to the liquid level sensor of this structure is still that two magnets 4 arranged oppositely form a magnetic field, and when the position of the buoy 3 changes, the magnetic field also changes position accordingly, and the magnetoresistive elements 2 at different positions detect the magnetic field strength Change and output a linear detection result, and calculate the liquid level height value according to the detection result, but the formula used in the detection method needs to be corrected and changed on the basis of formula 1 to formula 5.

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Abstract

The invention discloses a liquid level detection method and a liquid level sensor, belongs to the technical field of liquid level measurement and is designed to solve the problems such as low accuracy and the like of the existing method. The liquid level detection method comprises the following steps: oppositely arranging like poles of two magnets to form a magnetic field, changing the position of the magnetic field along with a change of the position of a float bowl, and arranging a plurality of magnetic resistance components used for collecting magnetic resistance signals at equal intervals in a moving range of the float bowl; detecting a magnetic field intensity change and outputting linear detection results by two adjacent magnetic resistance components between the two magnets when the float bowl moves, and calculating according to the detection results to obtain a liquid level height value. According to the liquid level detection method and the liquid level sensor, the measurement accuracy is high; the measurement method is simple; output values are easily read; the measurement process is continuous without interruption.

Description

technical field [0001] The present invention relates to the technical field of liquid level measurement, in particular to a liquid level detection method and a liquid level sensor for realizing the above liquid level detection method. Background technique [0002] In order to facilitate the understanding of the height of the liquid in the container (such as the liquid level in a car fuel tank), especially when the container is made of opaque materials, it is necessary to use a method based on the difference in physical properties of the medium on both sides of the liquid level or the amount of electricity or non It is measured by changing the physical parameters of electricity (such as capacitance, resistance, inductance, and the speed of sound and light). [0003] An existing detection method is to integrate the MR element (magnetoresistive element) switch and sampling resistor on the PCB assembly of the liquid level sensor. When the magnetic float moves to the vicinity of ...

Claims

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Application Information

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IPC IPC(8): G01F23/72
CPCG01F23/72G01F23/74G01F25/20
Inventor 顾一新
Owner 广东正扬传感科技股份有限公司
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