Low-temperature liquefied gas pressure measuring tube
A low-temperature liquefied gas, measuring tube technology, applied in the pressure difference measurement between multiple valves, measuring fluid pressure, measuring devices, etc., can solve the problems of inaccurate pressure measurement, abnormal work, etc., to ensure accuracy and Stability, the effect of eliminating the problem of large fluctuations in the pressure measurement value
Inactive Publication Date: 2018-07-17
JIANGSU REFRIGERATION & LIQUEFACTION EQUIP CO LTD
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Problems solved by technology
[0006] The purpose of the present invention is to overcome the defects of the prior art, provide a low-temperature liquefied gas pressure measuring tube, and solve the problem of inaccurate pressure measurement caused by the micro-leakage of the pipeline or the abnormal operation of the heat tracing device in the low-temperature liquefied gas pressure measuring tube
Method used
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[0013] Further describe below in conjunction with accompanying drawing:
[0014] Such as figure 1 As shown, a low-temperature liquefied gas pressure measuring tube includes a pressure measuring positive tube 1, a pressure measuring negative tube 2 drawn from the front and back of the throttle orifice plate 3, and a companion on the pressure measuring positive tube 1 and the pressure measuring negative tube 2. The thermal device 4 is connected with a trace gas compensating pipe 5 on the pressure measuring positive pipe 1 or the pressure measuring negative pipe 2, and the micro gas compensating pipe 5 is equipped with a micro-range flowmeter 6 for observing the amount of gas inflated and for adjusting the gas charging. A high-precision needle throttle valve 7 of large and small volume, and a cut-off valve 8 that cuts off the inflation gas source during maintenance.
[0015] In actual operation, the trace gas compensation tube 5 is installed on the pressure measuring positive tu...
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The invention discloses a low-temperature liquefied gas pressure measuring tube to solve inaccurate pressure measurement at present in the case of micro leakage of the measuring tube or abnormal operation of a heating device. The low-temperature liquefied gas pressure measuring tube comprises a pressure measuring positive pipe, a pressure measuring negative pipe and a heating device mounted on thepressure measuring positive pipe and the pressure measuring negative pipe. A trace gas compensation pipe communicates with the pressure measuring positive pipe or the pressure measuring negative pipe, and is provided with a flow meter, a throttle valve and a shut-off valve. The pressure in the low-temperature liquefied gas pressure measuring tube can be maintained unchanged when the measuring tube has a micro leak or the heating device operates abnormally, so that the excess low-temperature liquefied gas cannot enter the measuring tube. Therefore, the serious fluctuation of a pressure measured value caused by irregular gasification of the excess low-temperature liquefied gas entering measuring tube is eliminated, and the accuracy and the stability of the low-temperature liquefied gas pressure measurement are guaranteed.
Description
technical field [0001] The invention relates to a low-temperature liquefied gas pressure measuring tube. Background technique [0002] The low temperature liquefied gas pressure measurement is generally to install a throttling orifice plate on the outlet pipe of the cryogenic liquefied gas pump. Two pressure gauge tubes are led out from the front and back of the throttle orifice plate. Negative tube for pressure measurement. The low-temperature liquefied gas is vaporized by the heating device on the positive pipe or the negative pipe, and then led out and introduced into the pressure transmitter or local pressure gauge to obtain the standard gas source or DC signal, and then sent to the corresponding display unit to obtain the digital pressure value. The pressure measurement is completed, and the flow rate of the liquefied gas in the pipe can be further calculated according to the pressure difference between the positive pipe and the negative pipe of the pressure measuremen...
Claims
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Login to View More IPC IPC(8): G01L13/00G01F15/02
CPCG01F15/02G01L13/00
Inventor 樊军
Owner JIANGSU REFRIGERATION & LIQUEFACTION EQUIP CO LTD