Calibration method and device of low-temperature flowmeter
Inactive Publication Date: 2018-09-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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[0005] The embodiment of the present invention provides a method and device for calibrating a cryogenic flowmeter, to at least so
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Embodiment 1
[0033] According to an embodiment of the present invention, a calibration method for a cryogenic flowmeter is provided, see figure 1 ,include:
[0034] Control the flow of cryogenic fluid through the cryogenic flowmeter to be tested;
[0035] Perform heat exchange on the low temperature fluid flowing out of the low temperature flowmeter to be tested, so as to restore it from low temperature to normal temperature;
[0036] Normal temperature fluid calibration is performed on the normal temperature fluid after heat exchange, and the low temperature flowmeter to be tested is calibrated based on the normal temperature fluid calibration data.
[0037] The calibration method of the cryogenic flowmeter can calibrate the cryogenic flowmeter in a low temperature environment, greatly improves the accuracy and adaptability of the cryogenic flowmeter, and plays an important role in the design and application of the cryogenic system. The main idea of the invention is that during the ca...
Embodiment 2
[0045] According to another aspect of the embodiments of the present invention, a calibration device for a cryogenic flowmeter is provided, see image 3 , including: low-temperature Dewar 1, vaporizer 6, gas standard flowmeter 802; low-temperature Dewar 1, cryogenic flowmeter 202, vaporizer 6, and gas standard flowmeter 802 are connected by pipelines in sequence, wherein:
[0046] The cryogenic Dewar 1 is used to flow the stored cryogenic fluid through the cryogenic flowmeter 202 to be tested; the cryogenic Dewar 1 contains liquid nitrogen and other cryogenic fluids.
[0047]The vaporizer 6 is used to exchange heat for the low-temperature fluid flowing out of the low-temperature flowmeter 202 to be tested, so as to restore it from low temperature to normal temperature;
[0048] The gas standard flowmeter 802 is used to calibrate the normal temperature fluid after heat exchange.
[0049] Using the calibration device of the cryogenic flowmeter can effectively reduce the error o...
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Abstract
The invention relates to the field of flow calibration, in particular to a calibration method and device of a low-temperature flowmeter. By the aid of the method and the device, a low-temperature fluid is controlled to flow through the to-be-detected low-temperature flowmeter, the low-temperature fluid flowing out of the to-be-detected low-temperature flowmeter is subjected to heat exchange, so that the fluid recovers to the normal temperature from the low temperature, the heat-exchanged normal-temperature fluid is calibrated, and the to-be-detected low-temperature flowmeter is calibrated according to normal-temperature fluid calibration data. The low-temperature flowmeter can be calibrated in the low-temperature environment, the accuracy and adaptability of the low-temperature flowmeter are improved to a great extent, the low-temperature fluid flowing through the low-temperature flowmeter is always in the low-temperature environment, then, the low-temperature fluid recovers to the normal temperature state through heat exchange, finally, the normal-temperature fluid is measured with a normal-temperature fluid flow measuring method, and the low-temperature flowmeter is calibrated according to fluid data measured at the normal temperature.
Description
technical field [0001] The invention relates to the field of flow calibration, in particular to a calibration method and device for a cryogenic flowmeter. Background technique [0002] With the continuous development of modern science and technology, cryogenic research has become increasingly in-depth. In the fields of aerospace, large scientific system engineering, medical equipment and nuclear energy utilization, there has been a huge demand for cryogenic technology and cryogenic systems. The measurement of the internal flow of the cryogenic system directly affects many aspects such as system debugging, system optimization, working condition analysis and troubleshooting. Due to the low temperature of the fluid working medium in the low-temperature system, the system has high sealing requirements, and the types of flowmeters are also restricted. Because there are moving parts inside the turbine flowmeter and float flowmeter, moving parts are easy to occur in low-temperature...
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IPC IPC(8): G01F25/00
CPCG01F25/00
Inventor 贾启明李正宇张宇王炳明朱伟平刘立强龚领会
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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