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Liquid level sensor based on pressure detection

A liquid level sensor and pressure technology, applied in the sensor field, can solve the problems of high detection accuracy and good stability, and achieve the effects of high detection accuracy, good stability and high reliability

Active Publication Date: 2014-11-19
WUHAN FINEMEMS
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  • Abstract
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Problems solved by technology

[0004] The invention discloses a liquid level sensor based on pressure detection, which solves the disadvantages of existing sensors, not only has high detection accuracy and good stability, but also overcomes the problem of liquid level detection in a sealed container

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  • Liquid level sensor based on pressure detection
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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] refer to figure 1 and figure 2 , a liquid level sensor based on pressure detection, including a mounting flange 17, a vertical information tube 16, a patch base 14, a pressure detection module 12 and a processing circuit board 18, and the pressure detection module 12 that has been adjusted to a certain range Attach the corresponding positions of the mounting flange 17 and the patch base 14 with polymer glue, and then connect the mounting flange 17 and...

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Abstract

The invention discloses a liquid level sensor based on pressure detection. The liquid level sensor comprises a pressure detection module, a housing and a processing circuit. The liquid level sensor is characterized in that the pressure detection module is available in a single-chip or double-chip mode; in the single-chip mode, the pressure detection module is disposed at one end of a vertical information tube and used to detect bottom pressure of liquid under measurement, and meanwhile, the pressure of an upper cavity above the liquid is used as a reference pressure; in the double-chip mode, two pressure detection modules are disposed at two ends of the vertical information tube and used to detect the bottom pressure of the liquid and the pressure of the upper cavity above the liquid. By the use of the liquid level sensor, the defects such that reed switch type and thick film resistor type liquid gauges are low in precision and low in reliability are overcome; meanwhile, output signals can be directly applied to following instruments.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a liquid level sensor based on pressure detection. Background technique [0002] At present, most types of fuel position sensors on engineering vehicles and commercial vehicles are dry reed switch type or thick film resistive liquid level gauge. On-off is used to control the resistance of the access circuit, and the change of the measured liquid level corresponds to the resistance voltage signal. This detection principle determines the discontinuity of the output signal and the measurement accuracy is not high. At the same time, there are relative sliding parts in the structure. There are problems with long-term reliability. The thick film resistive liquid level gauge, including resistance and sliding system, changes the position of the contact on the resistance body through the sliding system, so as to correspond to the liquid level. On the one hand, there is contact friction i...

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Application Information

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IPC IPC(8): G01F23/14
Inventor 刘胜王小平曹万李凡亮但强
Owner WUHAN FINEMEMS
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