A gas volume measurement displacement device

Abstract

The present invention relates to a gas volume measurement and replacement device, which is suitable for occasions of measuring the volume of small-flow gas, and is suitable for the sealing detection of certain devices, especially the detection under high-pressure state, and the occasion of measuring the cumulative leakage of gas over a period of time. At present, the range of flow meters is difficult to reach a small flow. If a flow meter with a larger range is used, the error during measurement will be relatively large. For example, to detect the sealing performance of a certain device, such as certain natural gas equipment, hydrogen equipment, etc., there are high requirements for sealing. At present, the leakage of gas can only be indirectly measured by inflating and pressurizing the device first, and then closing the gas pipeline, and detecting the air pressure change of the device. This method has a large error and cannot meet high-precision requirements. The present invention is provided with a liquid storage device, a measuring device, a pipeline and a valve, and uses the gas drainage principle to replace the gas volume with the liquid volume, thereby solving the problem of high-precision measurement of the volume of small-flow gas.

Description

Technical Field

[0001] The present invention relates to the field of measurement, in particular to the field of gas volume measurement. Background Art

[0002] It is difficult to measure small flow rates of gas. The current flow meter range is difficult to reach small flow rates. If a flow meter with a larger range is used, the error in gas measurement will be relatively large. We often encounter the need for high-precision cumulative measurement of gas volume at small flow rates for a long time, which is currently unable to meet market demand. For example, to detect the sealing performance of a certain device, currently we can only indirectly measure the gas leakage by inflating and pressurizing the device, closing the gas pipeline, and detecting the air pressure changes of the device. This method has large errors and cannot meet the requirements, especially for detecting devices with high sealing requirements, such as equipment using natural gas, hydrogen equipment, etc., which all have high requirements for sealing. Summary of the invention

[0003] In response to the above-mentioned needs, the device of the present invention, when measuring the cumulative volume of a small flow rate gas, uses the principle of gas discharging liquid to replace the measured gas volume with the volume of liquid, thereby creating conditions for accurately measuring the volume of the liquid and solving the problem of high-precision measurement of the cumulative volume of a small flow rate gas.

[0004] In order to achieve the above-mentioned purpose, the gas volume measurement and displacement device of the present invention includes a liquid reservoir 1 and a measuring device 2; the liquid reservoir 1 is provided with a measuring liquid outlet 4, a liquid inlet 11, an air inlet 12, and a liquid reservoir connecting port 13; the measuring liquid outlet 4 is arranged at the lower part of the liquid reservoir 1, and the liquid reservoir connecting port 13 and the air inlet 12 are arranged at the upper part of the liquid reservoir 1; the liquid reservoir 1 is also provided with an air inlet valve 33 connected to the air inlet 12, and a liquid inlet valve 32 connected to the liquid inlet 11; the liquid reservoir 1 is also provided with an exhaust valve 38 at its upper part.

[0005] The measuring device 2 is provided with a measuring liquid inlet 5, a measuring liquid outlet 14, a measuring device connecting port 15, and an air outlet 16; the measuring device connecting port 15 is provided at the upper part of the measuring device 2, and is connected to the liquid reservoir connecting port 13 through a connecting valve 30; the air outlet 16 is provided at the upper part of the measuring device 2; the measuring liquid inlet 5 is provided at the upper part of the measuring device 2; the air inlet 12, the liquid reservoir connecting port 13, the measuring device connecting port 15, and the air outlet 16 are all higher than the position of the measuring liquid inlet 5 in vertical height; the measuring liquid inlet 5 is connected to the measuring liquid outlet 4 through a pipeline; the measuring device 2 is provided with a discharge valve 34 connected to the measuring liquid outlet 14, and an air outlet valve 35 connected to the air outlet 16. The device is also provided with a liquid infusion tube 6, one end of which is connected to the measuring liquid outlet 4, and the other end is led upward to a height of 2mm to 9000mm and connected to the measuring liquid inlet 5.

[0006] Furthermore, on one hand, the infusion tube 6 provided in the device is arranged outside the liquid reservoir 1 , and the measuring liquid outlet 4 is arranged on the wall of the liquid reservoir 1 .

[0007] Furthermore, on the other hand, the measuring liquid outlet 4 is arranged inside the liquid reservoir 1, one end of the infusion tube 6 is connected to the measuring liquid outlet 4, and the other end passes through the container wall of the liquid reservoir 1, leads to the outside of the liquid reservoir 1, and is connected to the measuring liquid inlet 5.

[0008] In the above two aspects, moreover, a discharge pipeline and a discharge valve 31 connected thereto are provided at the lower part of the liquid reservoir 1, and a liquid reservoir pressure gauge 23, a liquid reservoir level gauge 20, and a safety valve 36 are also provided;

[0009] The measuring device 2 is provided with a measuring device liquid level gauge 22 , a measuring device pressure gauge 24 , and a safety valve 37 .

[0010] The present invention has the following advantages:

[0011] 1. The present invention creates conditions for accurately measuring the cumulative volume of small flow gas.

[0012] 2. It is particularly suitable for testing the sealing performance of certain devices and measuring the cumulative gas leakage over a period of time. It is especially suitable for testing the sealing performance of devices that have high requirements for the sealing performance of gas media and the sealing performance of gas under a certain high pressure.

[0013] 3. The valve of this device can adopt an automatically controlled valve, so that the measurement operation can be automated and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 , indicating a gas volume measurement displacement device with the infusion tube outside the reservoir;

[0015] Figure 2 , indicating that the infusion tube passes through the gas volume displacement device inside the reservoir. DETAILED DESCRIPTION

[0016] A gas volume measurement and displacement device, two specific embodiments of which are described below.

[0017] First embodiment:

[0018] like Figure 1A gas measurement and replacement device comprises a liquid reservoir 1 and a measuring device 2; the liquid reservoir 1 is provided with a measuring liquid outlet 4, a liquid inlet 11, an air inlet 12, and a liquid reservoir connecting port 13; the measuring liquid outlet 4 is arranged at the lower part of the liquid reservoir 1, and the liquid reservoir connecting port 13 and the air inlet 12 are arranged at the upper part of the liquid reservoir 1; the liquid reservoir 1 is also provided with an air inlet valve 33 connected to the air inlet 12 and a liquid inlet valve 32 connected to the liquid inlet 11; the liquid reservoir 1 is also provided with an exhaust valve 38 at its upper part.

[0019] The measuring device 2 is provided with a measuring liquid inlet 5, a measuring liquid outlet 14, a measuring device connecting port 15, and an air outlet 16; the measuring device connecting port 15 is provided at the upper part of the measuring device 2, and is connected to the liquid reservoir connecting port 13 through a connecting valve 30; the air outlet 16 is provided at the upper part of the measuring device 2; the measuring liquid inlet 5 is provided at the upper part of the measuring device 2; the air inlet 12, the liquid reservoir connecting port 13, the measuring device connecting port 15, and the air outlet 16 are all higher than the position of the measuring liquid inlet 5 in vertical height; the measuring liquid inlet 5 is connected to the measuring liquid outlet 4 through a pipeline; the measuring device 2 is provided with a discharge valve 34 connected to the measuring liquid outlet 14, and an air outlet valve 35 connected to the air outlet 16. The device is also provided with a liquid infusion tube 6, one end of which is connected to the measuring liquid outlet 4, and the other end is led upward to a height of 2mm to 9000mm and connected to the measuring liquid inlet 5.

[0020] The infusion tube 6 provided in the device is arranged outside the liquid reservoir 1 , and the measuring liquid outlet 4 is arranged on the wall of the liquid reservoir 1 .

[0021] A liquid discharge pipeline and a liquid discharge valve 31 connected thereto are arranged at the lower part of the liquid reservoir 1 , and a liquid reservoir pressure gauge 23 , a liquid reservoir level gauge 20 , and a safety valve 36 are also arranged.

[0022] The measuring device 2 is provided with a measuring device liquid level gauge 22 , a measuring device pressure gauge 24 , and a safety valve 37 .

[0023] Second embodiment:

[0024] like Figure 2 A gas measurement and replacement device comprises a liquid reservoir 1 and a measuring device 2; the liquid reservoir 1 is provided with a measuring liquid outlet 4, a liquid inlet 11, an air inlet 12, and a liquid reservoir connecting port 13; the measuring liquid outlet 4 is arranged at the lower part of the liquid reservoir 1, and the liquid reservoir connecting port 13 and the air inlet 12 are arranged at the upper part of the liquid reservoir 1; the liquid reservoir 1 is also provided with an air inlet valve 33 connected to the air inlet 12 and a liquid inlet valve 32 connected to the liquid inlet 11; the liquid reservoir 1 is also provided with an exhaust valve 38 at its upper part.

[0025] The measuring device 2 is provided with a measuring liquid inlet 5, a measuring liquid outlet 14, a measuring device connecting port 15, and an air outlet 16; the measuring device connecting port 15 is provided at the upper part of the measuring device 2, and is connected to the liquid reservoir connecting port 13 through a connecting valve 30; the air outlet 16 is provided at the upper part of the measuring device 2; the measuring liquid inlet 5 is provided at the upper part of the measuring device 2; the air inlet 12, the liquid reservoir connecting port 13, the measuring device connecting port 15, and the air outlet 16 are all higher than the position of the measuring liquid inlet 5 in vertical height; the measuring liquid inlet 5 is connected to the measuring liquid outlet 4 through a pipeline; the measuring device 2 is provided with a discharge valve 34 connected to the measuring liquid outlet 14, and an air outlet valve 35 connected to the air outlet 16. The device is also provided with a liquid infusion tube 6, one end of which is connected to the measuring liquid outlet 4, and the other end is led upward to a height of 2mm to 9000mm and connected to the measuring liquid inlet 5.

[0026] The measuring liquid outlet 4 is arranged inside the liquid reservoir 1 , and one end of the infusion tube 6 is connected to the measuring liquid outlet 4 ; the other end of the infusion tube 6 passes through the container wall of the liquid reservoir 1 , leads to the outside of the liquid reservoir 1 , and is connected to the measuring liquid inlet 5 .

[0027] The lower part of the liquid reservoir 1 is provided with a liquid discharge pipeline and a liquid discharge valve 31 connected thereto, and is also provided with a liquid reservoir pressure gauge 23, a liquid reservoir level gauge 20, and a safety valve 36;

[0028] The measuring device 2 is provided with a measuring device liquid level gauge 22 , a measuring device pressure gauge 24 , and a safety valve 37 .

[0029] The following describes a method for detecting the air tightness of a device using the present device. The general requirement is that the air leakage must be within a specified range at a specified time and a specified pressure. Both of the above methods are suitable for measuring the gas volume. It should be noted that the test pressure of the sealing device to be tested must be less than the design pressure of the liquid reservoir 1 and the measuring device 2. Pressure gauges 23 and 24 are used to detect the pressure of the container in real time, and safety valves 36 and 37 are used to ensure the safety of the container to avoid overpressure. The specific measurement steps are as follows:

[0030] 1. The device is placed securely. Close the drain valve 31, the inlet valve 32, and the air inlet valve 33, and open the discharge valve 34, the connecting valve 30, the outlet valve 35, and the exhaust valve 38. The outlet valve 35 is connected to the pipeline of the device to be tested, the inlet valve 33 is connected to the gas pipeline to be tested, and the inlet valve 32 is connected to the water supply circuit.

[0031] 2. Open the liquid inlet valve 32 and add water to the liquid reservoir 1. When the water level rises to the point where it can flow out from the measuring liquid inlet 5, it will also be discharged from the discharge valve 34. At this time, close the liquid inlet valve 32 and wait until no water is discharged from the discharge valve 34, indicating that the measuring device 2 is empty, and then close the discharge valve 34.

[0032] 3. Close all outlet pipes of the device to be tested, open the outlet valve 35, and close the exhaust valve 38. Slowly open the inlet valve 33. Connect the device to be tested and the two containers, both of which are at the measuring pressure.

[0033] 4. Close the connecting valve 30, start the measurement, and start the timing.

[0034] 5. When there is air leakage in the device to be tested, the pressure will decrease, causing the pressure in the reservoir 1 to be greater than the pressure in the measuring device 2, and the water in the reservoir 1 will be discharged from the infusion tube 6 into the measuring device 2.

[0035] 6. When the measuring time is up, read the pressure value p1 of the measuring instrument pressure gauge 24, close the intake valve 33, open the connecting valve 30 first, and then open the exhaust valve 38.

[0036] 7. Open the discharge valve 34 and use a measuring container to accurately measure the volume v1 of the discharged water. This volume is the volume of the air leaked from the device under test at the pressure p1. According to the ideal gas equation, the volume v0 of the leaked air at the standard atmospheric pressure p0 can be approximately calculated: v0 = v1p1 / p0.

[0037] In order to measure the volume of water discharged more accurately, it is recommended to use an electronic scale to convert the measured weight into volume for calculation, so as to accurately calculate the volume of air leaked by the device under test under the pressure of p1 over a period of time.

Claims

1. A gas volume measurement and displacement device, comprising a liquid reservoir (1) and a measuring device (2); wherein: The liquid reservoir (1) is provided with a measuring liquid outlet (4), a liquid inlet (11), an air inlet (12), and a liquid reservoir connecting port (13); the measuring liquid outlet (4) is provided at the lower part of the liquid reservoir (1), and the liquid reservoir connecting port (13) and the air inlet (12) are provided at the upper part of the liquid reservoir (1); the liquid reservoir (1) is also provided with an air inlet valve (33) connected to the air inlet (12), and a liquid inlet valve (32) connected to the liquid inlet (11); the liquid reservoir (1) is also provided with an exhaust valve (38) at its upper part; The measuring device (2) is provided with a measuring liquid inlet (5), a measuring liquid discharge port (14), a measuring device communication port (15), and an air outlet (16); the measuring device communication port (15) is provided at the upper part of the measuring device (2) and is connected to the liquid reservoir communication port (13) through a communication valve (30); the air outlet (16) is provided at the upper part of the measuring device (2); the measuring liquid inlet (5) is provided at the upper part of the measuring device (2); the air inlet (12), the liquid reservoir communication port (13), the measuring device communication port (15), and the air outlet (16) are all higher than the measuring liquid inlet (5) in terms of vertical height; the measuring liquid inlet (5) is connected to the measuring liquid outlet (4) through a pipeline; the measuring device (2) is provided with a discharge valve (34) connected to the measuring liquid discharge port (14), and an air outlet valve (35) connected to the air outlet (16); The device is also provided with a liquid infusion tube (6), one end of which is connected to the measuring liquid outlet (4), and the other end of which is led upward to a height of 2 mm to 9000 mm and is connected to the measuring liquid inlet (5).

2. The gas volume measurement displacement device according to claim 1, characterized in that: The infusion tube (6) provided in the device is arranged outside the liquid reservoir (1), and the measuring liquid outlet (4) is arranged on the wall of the liquid reservoir (1).

3. The gas volume measurement and displacement device according to claim 1, characterized in that: The measuring liquid outlet (4) is arranged inside the liquid reservoir (1); one end of the liquid infusion tube (6) is connected to the measuring liquid outlet (4), and the other end passes through the container wall of the liquid reservoir (1) to the outside of the liquid reservoir (1) and is connected to the measuring liquid inlet (5).

4. The gas volume measurement displacement device according to claim 2 or claim 3, characterized in that: The lower part of the liquid reservoir (1) is provided with a liquid discharge pipeline and a liquid discharge valve (31) connected thereto, and is also provided with a liquid reservoir pressure gauge (23), a liquid reservoir level gauge (20), and a safety valve (36); The measuring device (2) is provided with a measuring device liquid level gauge (22), a measuring device pressure gauge (24), and a safety valve (37).

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