Segmented heating type thermocouple liquid level sensor

A liquid level sensor and segmental heating technology, which is applied in the direction of liquid level indicators for physical variable measurement, can solve the problems of liquid droplets interfering with accurate liquid level measurement, affecting the response speed of surrounding media, and false liquid level signals, etc., to achieve shortening Measuring the effect of response time, small inertia, and increased heat dissipation area

Active Publication Date: 2011-09-28
NINGBO AUQI AUTO INSTR EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the existing hot-end heating type thermocouple liquid level gauge is easy to form a liquid film on the outer surface of the detection rod, which is easily affected by droplet splashing. The consequences are: ① It seriously affects its response speed to changes in the surrounding medium, resulting The result lags behind the actual liquid level, that is, the inertia is large; ②The splashing of liquid droplets seriously interferes with its accurate measurement of the liquid level, resulting in false liquid level signals

Method used

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  • Segmented heating type thermocouple liquid level sensor
  • Segmented heating type thermocouple liquid level sensor
  • Segmented heating type thermocouple liquid level sensor

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] like figure 1 , 2 As shown, a segmented hot-end heating thermocouple liquid level sensor used in high-reliability occasions consists of hot-end plug 1, insulating material 2, bottom temperature-measuring thermocouple 3, and armored casing with triangular grooves on the surface 4. N pairs of differential thermocouples 5, liquid film blocking cover 6, N segment conductor 7, N segment heating wire 8, porous splash guard 9, and cold end sealing tube 10.

[0017] There are 4 sections of connecting conductor 7 and heating wire 8, 4 pairs of differential thermocouples 5, and the distance between the two nodes is 25mm. ; The insulating material 2 is high-purity MgO.

[0018] Bottom temperature measuring thermocouple 3, 4 pairs of differential thermocouple 5, 4 sections of conductor 7, 4 sections of heating wire 8, insulating material 2 and a...

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Abstract

The invention discloses a segmented heating type thermocouple liquid level sensor comprising a hot end plug, a cold end packing tube, a plurality of sections of heating wires, a plurality of differential thermocouples, an insulating material and an armored casing; one node of each differential thermocouple is located at the middle position of each section of heating wire and the other node has a certain distance from each section of heating wire; the plurality of heating wires, the plurality of differential thermocouples and the insulating material are armored in the armored casing; the measuring end of the armored casing is welded with the hot end plug and the other end of the armored casing is provided with the cold end packing tube; and the surface of the heating section of the armoredcasing is provided with a groove. Due to axial segmented heating, non-uniformity of axial temperature distribution on the surface of the armored casing can be effectively improved, and the flexibility of a measuring temperature difference is improved, so that the reliability of liquid level measurement is improved.

Description

technical field [0001] The invention belongs to the field of sensor technology and thermal parameter measurement, and relates to a heating type thermocouple liquid level sensor, which is used for measuring the liquid level in a container or a liquid storage tank. Background technique [0002] At present, the liquid level sensors used in pressure vessels of pressurized water reactor nuclear power plants and high-temperature and high-pressure boilers or liquid storage tanks of thermal power plants, which require high reliability, mostly use differential pressure liquid level gauges, float level gauges, Magnetic level gauges and liquid level gauges such as transparent glass tubes (plates), some of these level gauges are indirect measurements, some are not reliable, and some have a short service life. In these occasions where high reliability is required, the reliability of liquid level measurement is directly related to the safety of production equipment and personal safety, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/22
Inventor 孙炯
Owner NINGBO AUQI AUTO INSTR EQUIP
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