Low-speed hot fluid flowmeter
A flowmeter and thermal fluid technology, applied in the field of flowmeters, can solve problems such as being unsuitable for water working medium and large flow measurement, losing flow measurement function, difficult to measure flow, etc., achieving simple structure, small flow resistance, maintenance and repair. handy effect
Inactive Publication Date: 2011-04-20
HARBIN ENG UNIV
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Problems solved by technology
Since the temperature at the upper end of the heat conduction rod is strongly affected by the external ambient temperature and heat transfer conditions, and the external natural ambient temperature and heat transfer conditions are generally unstable and variable, it is difficult to measure a stable flow rate with this measurement technique. Even lose the flow measurement function
Other forms of thermal flowmeters disclosed in patent application numbers 99256144.2, 03820416.9 and other documents all need to be equipped with micro electric heaters, which are generally suitable for gas and small flow measurement, but not suitable for hydraulic fluid and large flow measurement
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[0029] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0030] combine figure 1 and 2 , a thermal fluid flowmeter based on the principle of heat conduction, mainly suitable for flow measurement of high-temperature, high-pressure, and low-velocity fluids in large-diameter channels. Temperature detection unit 3. Wherein, the main body of the heat conduction unit 2 of the flowmeter is composed of a temperature sensing column 6 inserted into the fluid pipeline 1 to be measured and a heat conduction column 8 connected in sequence, a heat collecting sheet 9, a refrigeration temperature controller 10, a radiator 11 and a fan 12. The temperature column 6 and the heat conduction column 8 are covered with a stainless steel casing 4, and the graphite 5 is filled between the casing 4 and the temperature sensing column 6, and the heat insulating material 7 is filled between the casing 4 and the heat conduction column 8, and the t...
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The invention provides a low-speed hot fluid flowmeter which comprises a heat conducting unit and a fluid temperature detecting unit, wherein the heat conducting unit and the fluid temperature detecting unit are arranged on a fluid pipeline to be measured along the flow direction of a fluid, the heat conducting unit and the fluid temperature detecting unit are horizontally installed in the pipeline through which the fluid to be measured flows, the heat conducting unit is arranged at an upstream position, and the fluid temperature detecting unit is arranged at a downstream position. The invention has simple structure and convenient overhauling and is suitable for the flow measurement of the fluid with high temperature, high pressure, large pipe diameter and low flow speed. The low-speed hot fluid flowmeter is not provided with a rotating part, is reliable in operation and has quite small flow resistance. The invention not only can be used for the flow measurement of a high-temperature liquid, but also can be used for the flow measurement of a high-temperature gas.
Description
technical field [0001] The invention relates to a flowmeter, in particular to a low-speed thermal fluid flowmeter based on the principle of heat conduction. Background technique [0002] With the increasing maturity of nuclear energy technology, especially the development of passive technology, more and more small and medium-sized special power plants tend to adopt nuclear power systems with natural circulation capabilities. In this kind of nuclear power system, the reactor not only needs to operate under rated power conditions, but also often needs to operate under low power conditions, so that the coolant is in a low flow state for a long time, which brings great difficulties to flow measurement. Potential threat to reactor safety. [0003] For flow measurement technology, countries around the world have carried out extensive and in-depth research according to actual needs, and developed a wide variety of flow measurement instruments. For the reactor primary circuit syst...
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IPC IPC(8): G01F1/688
Inventor 孙中宁阎昌琪范广铭范文辉
Owner HARBIN ENG UNIV