Orifice flowmeter calibration device based on negative pressure standard table method

Abstract

The utility model relates to a kind of orifice flowmeter calibration device based on negative pressure standard table method, including air inlet part, first pressure stabilizer, first detection channel, second detection channel, second pressure stabilizer, vacuum pump and muffler, by two different caliber Roots flowmeter as standard table cover different flow range, it can be realized that all flow points in flow range are uninterrupted measurement, device works in negative pressure state, measurement process is close to orifice flowmeter actual use state, measurement result is more accurate and reliable;Simultaneously by controlling the three-way valve before and after standard table can be connected into negative pressure nozzle method gas flow standard device, the in-situ calibration of standard table is realized, repeated disassembly and installation are exempted, traceability efficiency and operation convenience are improved.Simultaneously, the standard table of the utility model is also measured by negative pressure method by nozzle method gas flow standard device calibration, completely comply with the actual working condition of standard table, make device measurement result more accurate.

Claims

1. An orifice flow meter calibration device based on negative pressure standard table method, characterized in that: The device includes an air inlet section, a first pressure stabilizing container, a first detection channel, a second detection channel, a second pressure stabilizing container, a vacuum pump, and a silencer. The air inlet section is connected to the first pressure stabilizing container. The output of the first pressure stabilizing container is connected to the input of both the first and second detection channels. The outputs of the first and second detection channels are connected to the input of the second pressure stabilizing container. The second pressure stabilizing container, vacuum pump, and silencer are connected sequentially. The air inlet section is used for air intake during device calibration. The first pressure stabilizing container ensures stable air pressure in the pipeline at the front end of the detection channel, and the second pressure stabilizing container ensures stable air pressure in the pipeline at the rear end of the detection channel. The first detection channel is used for flow calibration of orifice flow meters and pipeline flow meters, as well as in-situ calibration of a first standard meter. The second detection channel is used for flow calibration of orifice flow meters and pipeline flow meters, as well as in-situ calibration of a second standard meter. The vacuum pump is used to extract air from the pipeline to achieve negative pressure calibration of the flow meters.

2. The orifice flow meter calibration device based on negative pressure standard table method of claim 1, wherein: The air intake section includes a first air inlet, a pipe-type flow meter clamp position, a first three-way valve, an orifice flow meter, a second air inlet, a first pressure transmitter, a first temperature transmitter, and a filter. The first air inlet is connected to the input end of the first three-way valve through the pipe-type flow meter clamp position, and the second air inlet is connected to the other input end of the first three-way valve through the orifice flow meter. The output end of the first three-way valve is connected to the first pressure stabilizing vessel in sequence through the first pressure transmitter, the first temperature transmitter, and the filter.

3. The orifice flow meter calibration device based on negative pressure standard table method of claim 1, wherein: The first detection channel includes a third air inlet, a second three-way valve, a first standard gauge, a second pressure transmitter, a second temperature transmitter, a first auxiliary air outlet, and a fourth three-way valve. The output end of the first pressure stabilizing container is connected to the input end of the second three-way valve, the third air inlet is connected to the other input end of the second three-way valve, the output end of the second three-way valve is connected to the input end of the fourth three-way valve in sequence through the first standard gauge, the second pressure transmitter, and the second temperature transmitter, the first auxiliary air outlet is connected to the output end of the fourth three-way valve, and the other output end of the fourth three-way valve is connected to the second pressure stabilizing container.

4. The orifice flow meter calibration device based on negative pressure standard table method of claim 1, wherein: The second detection channel includes a fourth air inlet, a third three-way valve, a second standard gauge, a third pressure transmitter, a third temperature transmitter, a second auxiliary air outlet, and a fifth three-way valve. The output of the first pressure stabilizing container is connected to the input of the third three-way valve, the fourth air inlet is connected to the other input of the third three-way valve, the output of the third three-way valve is connected to the input of the fifth three-way valve in sequence through the second standard gauge, the third pressure transmitter, and the third temperature transmitter, the second auxiliary air outlet is connected to the output of the fifth three-way valve, and the other output of the fifth three-way valve is connected to the second pressure stabilizing container.

5. The orifice flow meter calibration device based on negative pressure standard table method of claim 1, wherein: The first pressure stabilizing vessel also includes a first switching valve connected thereto.

6. The orifice flow meter calibration device based on negative pressure standard table method of claim 1, wherein: The second pressure stabilizing vessel also includes a second switching valve connected thereto.

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