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Great-capacitance capacitive liquid level sensor suitable for dynamic environment

A liquid level sensor and dynamic environment technology, which is applied in the field of liquid level sensors, can solve problems such as inability to adapt to the dynamic environment, and achieve the effect of ensuring test life and test accuracy

Active Publication Date: 2015-12-09
上海天行控制科技有限公司
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AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at the problem that the industrial-grade capacitive liquid level sensor has a bottleneck in expanding the measurement capacity and cannot adapt to the dynamic environment. It proposes a large-capacitance capacitive liquid level sensor suitable for the dynamic environment. The shaft structure solves the limitation of the test capacity, and at the same time can adapt to the dynamic environment, which greatly improves the application range of the capacitive liquid level sensor

Method used

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  • Great-capacitance capacitive liquid level sensor suitable for dynamic environment
  • Great-capacitance capacitive liquid level sensor suitable for dynamic environment
  • Great-capacitance capacitive liquid level sensor suitable for dynamic environment

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Embodiment Construction

[0017] Such as image 3 The schematic diagram of liquid level measurement by capacitance method is shown in the figure, and the detection electrode with insulating sleeve and its equivalent circuit diagram are pointed out in the figure. image 3 It can be seen that the top of the liquid surface is C 1 and C 2 Capacitors in series, while the lower part of the liquid is C 3 and C 4 series connection of capacitors, C 总 The output capacitance of the liquid is the parallel connection value of the two series capacitors on the liquid surface and below.

[0018] The following calculates the size of each capacitance value separately:

[0019]

[0020] When measuring conductive dielectric liquids, ε 1 ε 2 ;ε 1 ε 3 Capacitance C 4 In a short circuit state, the capacitance of the lower part of the liquid surface is only determined by the capacitance value of C3.

[0021]

[0022] Assuming that the metal liquid storage tank is cylindrical with a diameter of D, the diam...

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Abstract

The invention relates to a great-capacitance capacitive liquid level sensor suitable for dynamic environment. A keel support structure is designed, A frame structure that only bends along the plane directions of two keels is formed, a plurality of parallelly connected electrode core wires are placed in the keel support, and all electrode core wires and the keel support are parallelly arranged through a wire arranging mechanism and an adjusting mechanism. An entire structure is fixedly connected with a flange through a metallic ceramic insulator, and a metallic hose serves as an external electrode which sleeves outside the surface of the keel support. One end of the metallic hose is fixedly connected with the flange, and the other end of the metallic hose is fixedly connected with the tail end of the keel support to form a semi-flexible coaxial capacitive liquid level sensor. The great-capacitance capacitive liquid level sensor satisfies the requirements of measuring capacitance greater than 2000pF, and ensures the test life and test precision. The semi-flexible structure can test in dynamic environments, such as used on a boat, or detecting underground water level in a complex environment or narrow space.

Description

technical field [0001] The invention relates to a liquid level sensor, in particular to a large-capacitance capacitive liquid level sensor suitable for dynamic environments. Background technique [0002] At present, industrial-grade capacitive liquid level sensors at home and abroad are mainly divided into two types of structures, rod-type structure and rope-type structure. The measuring electrode of the capacitive liquid level sensor with rod structure is rigid, and the measuring length is less than or equal to 2.5 meters. The measuring electrode of the capacitive liquid level sensor with rope structure is flexible, and the measuring length is ≤30 meters. Regardless of the capacitive liquid level sensor with rod structure or rope structure, the measurement capacitance range is 30pF to 2000pF, and the measured water tank and capacitive liquid level sensor are required to be used in a static environment. [0003] The electrode seal of the capacitive liquid level sensor with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 王俊雄秦奖群邓明张炬刘亮薛洪臣
Owner 上海天行控制科技有限公司
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