CN219200507U

CN219200507U - Wide-range gas flow measuring device

Info

Publication number: CN219200507U
Application number: CN202320688710.2U
Authority: CN
Inventors: 严建中
Original assignee: Hubei Rocktek Instrument Co ltd
Current assignee: Hubei Rocktek Instrument Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-06-16
Anticipated expiration: 2033-03-31

Abstract

The utility model relates to a wide-range gas flow measuring device, which comprises a first gas inlet pipeline with a tested gas inlet end, wherein the first gas inlet pipeline is connected with one input end of a switching valve, the output end of the switching valve is sequentially connected with a large-flow gas flowmeter and a micro-gas flowmeter through a gas pipe, the other input end of the switching valve is connected with a second gas inlet pipeline which can provide additional gas, the second gas inlet pipeline is connected with a pump body which is used for providing a gas source, a first control valve is arranged on the second gas inlet pipeline between the pump body and the switching valve, a second control valve is arranged on the gas pipe of the output end of the large-flow gas flowmeter, and a third control valve is arranged on the gas pipe of the input end of the micro-gas flowmeter. The utility model realizes the work of the large-flow gas flowmeter and the micro-flow gas flowmeter through the cooperation of the second control valve and the third control valve, and the micro-flow gas flowmeter is arranged behind the large-flow gas flowmeter, so that the measurement of the large-flow gas and the micro-flow gas can be simultaneously satisfied.

Description

Wide-range gas flow measuring device

Technical Field

The utility model relates to the technical field of gas flow measurement, in particular to a wide-range gas flow measurement device.

Background

The existing single gas flow measuring equipment is multifunctional and single, either measures trace gas flow or measures large-flow gas flow, but cannot measure trace gas flow as small as microliter/hour and large-flow gas flow as large as liter/minute. When exposed to large and small conditions of gas flow, there is no suitable measuring device to measure it.

Disclosure of Invention

The utility model aims to provide a wide-range gas flow measuring device which can at least solve part of defects in the prior art.

In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions: the utility model provides a wide range gas flow measuring device, includes the first admission line that has the gas inlet end of being tested, one of them input of first admission line access switching valve, the output of switching valve has connected gradually high-flow gas flowmeter and trace gas flowmeter through the trachea, the another input termination of switching valve has the second admission line that can provide additional gas, the second admission line has connect the pump body that is used for providing the air supply, just the pump body with be equipped with first control valve on the second admission line between the switching valve, be equipped with the second control valve on the trachea of high-flow gas flowmeter's the output, be equipped with the third control valve on the trachea of trace gas flowmeter's input.

Further, a gas drying module is further arranged on the gas pipe between the first control valve and the high-flow gas flowmeter.

Further, the large-flow gas flowmeter is a thermal flowmeter, an ultrasonic flowmeter, a wet flowmeter, a precession vortex flowmeter, a turbine flowmeter or a vortex shedding flowmeter.

Further, the pump body comprises a peristaltic pump, a plunger pump or a piston pump.

Further, the first control valve, the second control valve and the third control valve are all electromagnetic valves.

Further, a pressure sensor for testing the seal of the pipeline is included.

Further, the pressure sensor is arranged on the air pipe between the high-flow air flowmeter and the second control valve.

Further, a temperature sensor for the temperature of the pipeline gas is also included.

Further, the temperature sensor is arranged on the air pipe between the high-flow air flowmeter and the second control valve.

Furthermore, the output ends of the second control valve and the trace gas flowmeter are both also connected with an emptying pipe.

Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a wide range gas flow measuring device, realizes the work of large-traffic gas flowmeter and trace gas flowmeter through the cooperation of second control valve and third control valve, and establishes the trace gas flowmeter behind the large-traffic gas flowmeter, can satisfy the measurement of large-traffic and micro-traffic gas simultaneously, then through the cooperation of first control valve, second control valve and third control valve three, can carry out leak hunting before measuring, guarantees the reliable degree of measured data.

Drawings

FIG. 1 is a schematic diagram of components on a gas circuit of a wide-range gas flow measurement device according to an embodiment of the present utility model;

in the reference numerals: 1-a pump body; 2-switching valves; 3-an air inlet end; 4-a first control valve; 5-a gas drying module; 6-a high flow gas flow meter; 7-a second control valve; 8-a micro gas flowmeter; 9-a third control valve; 10-emptying the pipe.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, an embodiment of the present utility model provides a wide-range gas flow measurement device, including a first gas inlet pipe having a tested gas inlet end 3, the first gas inlet pipe is connected to one of input ends of a switching valve 2, an output end of the switching valve 2 is sequentially connected to a large-flow gas flowmeter 6 and a micro-gas flowmeter 8 through a gas pipe, another input end of the switching valve 2 is connected to a second gas inlet pipe capable of providing another gas, the second gas inlet pipe is connected to a pump body 1 for providing a gas source, a first control valve 4 is disposed on the second gas inlet pipe between the pump body 1 and the switching valve 2, a second control valve 7 is disposed on a gas pipe of an output end of the large-flow gas flowmeter 6, and a third control valve 9 is disposed on a gas pipe of an input end of the micro-gas flowmeter 8. In the present embodiment, the operations of the large-flow gas flow meter 6 and the micro-flow gas flow meter 8 are realized by the cooperation of the second control valve 7 and the third control valve 9, and the measurement of the large-flow and micro-flow gas can be satisfied simultaneously by providing the micro-flow gas flow meter 8 after the large-flow gas flow meter 6. Specifically, the gas to be tested is communicated with one of the input ends of the switching valve 2 from the gas inlet end 3 of the first gas inlet pipeline, and the input end continuously sends the gas to be tested into the gas pipe behind the switching valve 2. At this time, the tested gas is measured by the large-flow gas flowmeter 6, if the flow rate is large, the large-flow gas flowmeter 6 can measure the measured value, the measured value can be recorded, at this time, the tested gas is turned off by the third control valve 9 to enter the micro-gas flowmeter 8, and when the flow rate is small, namely, the flow rate is lower than the threshold value of the large-flow gas flowmeter 6, the third control valve 9 can be opened, the micro-flow gas is used for measuring the gas flow rate, the measured value can be recorded, and thus, after a period of time, the measured values of the two flowmeters are processed, the flow rate change of the tested gas can be obtained, and the accumulated flow rate can be tested. In addition, before the device is used for measurement, in order to ensure the reliability of measured data, the leakage detection can be performed before the measurement. Specifically, the first control valve 4, the second control valve 7 and the third control valve 9 are closed, the input end of the switching valve 2, which is in butt joint with the first air inlet pipeline, is closed, the input end, which is in butt joint with the second air inlet pipeline, is opened, additional air is provided to enter the equipment pipeline, and then the pressure change can be measured through a temperature sensor, a pressure sensor or other existing means, so that whether leakage exists or not is judged. The third control valve 9 can cooperate with a system leakage detection program to realize leakage detection of a front-end pipeline system and protect the trace gas flowmeter 8 from damage caused by high-pressure air source impact during leakage detection.

As an optimization scheme of the embodiment of the present utility model, referring to fig. 1, a gas drying module 5 is further disposed on the gas pipe between the first control valve 4 and the large-flow gas flowmeter 6. In this embodiment, the gas drying module 5 is adopted, so that condensed water or water vapor in the gas can be prevented from directly entering the flow measurement module at the rear end, and the function of protecting the measurement module is achieved. The gas drying module can adopt a tank body, and a drying agent is arranged in the tank body, so that moisture can be absorbed.

As an optimization scheme of the embodiment of the present utility model, referring to fig. 1, the high-flow gas flowmeter 6 is a thermal flowmeter, an ultrasonic flowmeter, a wet flowmeter, a precession vortex flowmeter, a turbine flowmeter or a vortex shedding flowmeter. In this embodiment, these existing flowmeters may be selected as desired.

As an optimization scheme of the embodiment of the present utility model, referring to fig. 1, the second air intake pipe is provided with a peristaltic pump, a plunger pump or a piston pump. In this embodiment, a peristaltic pump, a plunger pump or a piston pump is provided to cooperate with providing an air source, so that the air source can be provided for detecting the air tightness of the system. Peristaltic pumps, plunger pumps or piston pumps are collectively referred to herein as pump bodies 1.

As an optimization scheme of the embodiment of the present utility model, referring to fig. 1, the first control valve 4, the second control valve 7, and the third control valve 9 are all solenoid valves. In the embodiment, the control valve adopts an electromagnetic valve, and can automatically control the opening or closing of the gas circuit by setting a threshold signal, thereby laying a foundation for automatic measurement.

As an optimization scheme of the embodiment of the utility model, please refer to fig. 1, and further include a pressure sensor for testing the seal of the pipeline. The pressure sensor is arranged on the air pipe between the high-flow air flowmeter and the second control valve. In this embodiment, the pressure sensor may be used in conjunction with the above-described self-leak detection. The pressure sensor is an existing device and can be used after being connected with a pipeline.

As an optimization scheme of the embodiment of the utility model, please refer to fig. 1, further comprising a temperature sensor for measuring the temperature of the pipeline gas. The temperature sensor is arranged on the air pipe between the high-flow air flowmeter and the second control valve. In this embodiment, a temperature sensor may also be used to measure the line gas temperature to correct the gas volume according to the ideal gas state equation.

As an optimization scheme of the embodiment of the present utility model, referring to fig. 1, the output ends of the second control valve and the micro gas flowmeter are both further connected with an emptying pipe. In this embodiment, the second control valve and the trace gas flow meter may be vented.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A wide range gas flow measurement device comprising a first gas inlet conduit having a gas inlet end to be tested, characterized in that: the first air inlet pipeline is connected with one input end of the switching valve, the output end of the switching valve is sequentially connected with a large-flow gas flowmeter and a trace gas flowmeter through an air pipe, the other input end of the switching valve is connected with a second air inlet pipeline which can provide additional gas, the second air inlet pipeline is connected with a pump body which is used for providing an air source, a first control valve is arranged on the second air inlet pipeline between the pump body and the switching valve, a second control valve is arranged on the air pipe of the output end of the large-flow gas flowmeter, and a third control valve is arranged on the air pipe of the input end of the trace gas flowmeter.

2. A wide range gas flow measurement device according to claim 1, wherein: and a gas drying module is further arranged on the gas pipe between the first control valve and the high-flow gas flowmeter.

3. A wide range gas flow measurement device according to claim 1, wherein: the large-flow gas flowmeter is a thermal flowmeter, an ultrasonic flowmeter, a wet flowmeter, a precession vortex flowmeter, a turbine flowmeter or a vortex street flowmeter.

4. A wide range gas flow measurement device according to claim 1, wherein: the pump body comprises a peristaltic pump, a plunger pump or a piston pump.

5. A wide range gas flow measurement device according to claim 1, wherein: the first control valve, the second control valve and the third control valve are all electromagnetic valves.

6. A wide range gas flow measurement device according to claim 1, wherein: a pressure sensor for testing the seal of the pipeline is also included.

7. A wide range gas flow measurement device according to claim 6, wherein: the pressure sensor is arranged on the air pipe between the high-flow air flowmeter and the second control valve.

8. A wide range gas flow measurement device according to claim 1, wherein: a temperature sensor for the temperature of the pipeline gas is also included.

9. A wide range gas flow measurement device according to claim 8, wherein: the temperature sensor is arranged on the air pipe between the high-flow air flowmeter and the second control valve.

10. A wide range gas flow measurement device according to claim 1, wherein: and the output ends of the second control valve and the trace gas flowmeter are also connected with an emptying pipe.