Method for testing temperature difference by surface-mounting temperature measuring element on wall of pipe

A temperature measuring element and pipe wall technology, which is applied in the field of measuring temperature difference by attaching the temperature measuring element to the pipe wall, can solve the problems of unfavorable unit safe operation, large workload, hidden dangers, etc., and achieves small workload and high safety. , The effect of preventing liquid leakage

Inactive Publication Date: 2015-11-11
HARBIN ELECTRIC MASCH CO LTD
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Problems solved by technology

All of these require anti-liquid leakage treatment, the workload is heavy, there are potential safety hazards, and it is not conducive to the safe operation of the unit

Method used

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  • Method for testing temperature difference by surface-mounting temperature measuring element on wall of pipe

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Embodiment Construction

[0048] A method in which the surface of the temperature measuring element is attached to the pipe wall to test the temperature difference:

[0049] In the first step, the material of the inlet and outlet liquid pipes of the cooler is the same: the pipe diameter, pipe wall thickness, and material of the water inlet and outlet pipes should be the same. At this time, the convective heat transfer coefficients of the liquid in the inlet and outlet pipes and the pipe wall are the same , the heat flux of convective heat transfer is similar;

[0050] The second step is the treatment of the outer wall of the pipe: clean the pipe wall to make it clean and free of stains; if there is a paint film on the pipe wall, polish it smooth to expose the material of the pipe body;

[0051] The third step is the direct contact between the temperature measuring probe and the pipe wall: fasten the temperature measuring probe on the pipe wall with self-adhesive tape and other tying ropes to make it in...

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Abstract

The invention relates to a method for testing temperature difference by surface-mounting a temperature measuring element on the wall of a pipe in order to test the temperature difference between liquid in an inlet pipe and liquid in an outlet pipe of a cooler. The method comprises the steps of pipe wall treatment, direct contact between a temperature measuring probe and the pipe wall, coating the temperature measuring probe with an insulating layer, pipe wall temperature test, and taking the tested pipe wall temperature difference as the temperature difference of cooling liquid in the pipes. The conditions for applying the method are as follows: the liquid inlet and outlet pipes of the cooler are made of the same material, thermal stability is achieved between liquid and pipe wall temperature, and the limit of temperature difference between liquid in a cold pipe and fluid in a hot pipe is 5K. By adopting the test method of the invention, equipment operation is not affected, the safety is high, treatment for preventing liquid leakage is not needed, reinstalling and re-machining on the pipes are not needed, the workload is small, and operation is convenient and quick.

Description

technical field [0001] The invention relates to a method in which a temperature measuring element is surface-attached on a pipe wall to test a temperature difference. Background technique [0002] The national standard "GB / T5321 Calorimetric Method for Determination of Motor Loss and Efficiency" stipulates that the loss can be determined by measuring the cooling liquid flow rate and temperature rise. According to the requirements of this standard, the installation depth of the casing of the liquid thermometer in the water inlet and outlet pipelines is between 0.6 and 0.8 times the diameter of the water pipe, and the shell wall material should be as thin as possible and have good thermal conductivity. According to this test requirement, it is necessary to install high-precision and certified temperature elements on the pipeline. However, to reinstall the temperature element, it is necessary to drill the pipeline, or use the original interface of the pipeline to reassemble th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K1/14G01K17/08G01K1/143
Inventor 苟智德富立新韩毅魏长健李明宇孙铎
Owner HARBIN ELECTRIC MASCH CO LTD
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