Device and method for measuring gas flow rate by drainage method

Abstract

The present invention discloses a device and method for measuring gas flow rate by a water displacement method. The method uses a water-insoluble gas to control the air intake through the opening and closing degree of a second valve, measures the volume of discharged water after ventilation for a period of time, and calculates the flow rate of the gas. When the gas flow rate value reaches a preset value, the external gas source and the gas-using device are connected, and the gas of the corresponding flow rate is delivered to the gas-using device, so as to achieve the function of measuring and using immediately. The device described in the present invention not only has the advantage of accurate measurement of the water displacement method, but also overcomes the disadvantage that the water displacement method cannot simultaneously measure, control and measure and use the gas flow rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas flow measurement, and particularly relates to a device and method for measuring gas flow by the water drainage method. Background Art

[0002] During the experiment, the gas magnitude under study is often relatively low, and there will be a large error when using a conventional flowmeter for measurement. Currently, the water drainage method is usually adopted in the laboratory. This method is accurate in measurement, but it cannot simultaneously possess the functions of measuring, controlling gas flow, and measuring and using immediately. Therefore, a device for measuring gas flow by the water drainage method is needed. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for measuring gas flow by the water drainage method, and solve the technical problem that in the prior art, the water drainage method is accurate in measurement, but it cannot simultaneously possess the functions of measuring, controlling gas flow, and measuring and using immediately.

[0004] The solution adopted by the present invention is as follows:

[0005] A device for measuring gas flow by the water drainage method includes a housing. An inlet and drainage port is provided at the top of the housing, and a rubber stopper capable of covering the inlet and drainage port is provided in the inlet and drainage port. A first partition is fixed in the housing. The first partition divides the housing into upper and lower parts, including an air storage chamber located below the first partition and a drainage chamber located above the first partition. On the side wall of the housing where the air storage chamber is located, scale lines for measuring the drained water volume are provided along the vertical direction. A first through hole is provided on the first partition, and a drain pipe is fixed in the first through hole. The upper end of the drain pipe communicates with the drainage chamber, and the lower end of the drain pipe extends to one side close to the bottom plate of the housing. A first valve is provided on the drain pipe. A second through hole is provided at a position on the side wall of the housing corresponding to the first valve. The operating handle of the first valve extends out of the housing through the second through hole, and the first valve and the second through hole are hermetically connected. A third through hole is provided on the side wall of the housing. The third through hole is located below the first partition and close to the first partition. A Y-shaped pipe is provided in the third through hole. The first port of the Y-shaped pipe can be connected to the pipeline of an external gas source. A second valve is provided on the pipeline of the external gas source. The second port of the Y-shaped pipe can be connected to the pipeline of a gas-using device. A third valve is provided on the pipeline of the gas-using device. The third port of the Y-shaped pipe is fixed in the third through hole.

[0006] The shell provides a closed space for the device, and the shell can be made of transparent materials, such as glass; by setting up inlet and outlet ports and rubber plugs, water can be injected into the shell through the inlet and outlet ports or the water in the shell can be poured out by inverting the shell, and the rubber plug can open or close the inlet and outlet ports; by setting up a first partition, the shell is divided into a gas storage chamber and a drainage chamber; by setting up a Y-shaped tube, the external gas source, the inside of the shell and the gas-using device can be interconnected through the Y-shaped tube and related pipelines, so when measuring the flow, close the third valve and open the second valve and the first valve to connect the external gas source and the inside of the shell, and isolate the gas-using device from the external gas source and the inside of the shell, and then measure the gas flow. When the gas flow value reaches a preset value, close the first valve and open the third valve and the second valve to connect the external gas source and the gas-using device. The gas of corresponding flow rate is delivered to the gas-using device to achieve the function of immediate measurement and immediate use; when water is injected into the shell, the highest liquid level of the water flow is not higher than the third port of the Y-tube, so as to prevent the water flow from entering the Y-tube, so that the actual volume of the water discharged during measurement is greater than the volume displayed on the scale line, which causes measurement errors. The second valve is provided to control the connection and disconnection between the external gas source and the inner side of the shell and the gas-using device; the third valve is provided to control the connection and disconnection between the gas-using device and the external gas source and the inner side of the shell; the drain pipe is provided to connect the water storage chamber and the drain chamber; the first valve is provided to control the connection and disconnection of the drain pipe, so that the water storage chamber and the drain chamber are connected or blocked, the valve body of the first valve is sealed and connected to the second through hole, and the user can control the connection and disconnection of the drain pipe from the outside of the shell by extending the operating handle of the first valve out of the shell.

[0007] Furthermore, one end of the first partition away from the drain pipe is bent upward in an L shape, and the bent portion of the first partition and the side wall of the shell together form an air intake area of the air storage chamber, and the third through hole of the Y-shaped tube is opened on the part of the shell side wall that is in the air intake area.

[0008] By setting up the air intake area, when measuring the gas flow, the gas enters the air intake area of the air storage chamber first. The structure of the air intake area will have a buffering effect on the gas, which can reduce the flow rate of the gas and prevent high-speed gas from directly entering the shell and causing water splashing.

[0009] Furthermore, a second partition is provided in the drainage chamber, dividing the drainage chamber into two parts, an upper part and an lower part, including a water collection area located above the second partition and a water storage area located between the second partition and the first partition; a U-shaped tube is provided on the outer wall of the shell to connect the water storage area and the water collection area, one pipe mouth of the U-shaped tube is arranged on the part of the side wall of the shell in the water storage area, and the other pipe mouth of the U-shaped tube is arranged on the part of the side wall of the shell in the water collection area.

[0010] By setting the second partition board, the drainage chamber is divided into a water collection area and a water storage area. If the second partition board is not set, when the liquid is drained into the drainage chamber, the water flow at a higher liquid level will generate a greater pressure, so the resistance during drainage will increase, the pressure between the gases will increase, the gases will be compressed, and the measured flow value will not be accurate enough. Therefore, by setting the second partition board, part of the water flow in the drainage chamber enters the water collection area through the U-shaped pipe, reducing the influence of the water flow at a high liquid level on the measurement result.

[0011] Furthermore, the second partition board is composed of three parts, including an upper partition board, a movable board, and a lower partition board; the upper partition board is fixed on the inner side wall of the housing along the horizontal direction, and a plurality of fourth through holes are provided on the upper partition board. The movable board is arranged between the upper partition board and the lower partition board, and the upper and lower surfaces of the movable board are respectively in contact with the upper partition board and the lower partition board. A fifth through hole is provided at a position on the movable board corresponding to the fourth through hole. A rotating shaft is provided on the movable board, and both the movable board and the rotating shaft are coaxially arranged with the housing. The two ends of the rotating shaft are respectively rotatably connected to the upper partition board and the lower partition board; a long strip-shaped sixth through hole is provided at a position on the side wall of the housing corresponding to the movable board, and a handle is provided in the sixth through hole. One end of the handle is connected to the movable board, and the other end of the handle extends out of the sixth through hole; the lower partition board is fixed on the inner side wall of the housing along the horizontal direction, and a seventh through hole is provided at a position on the lower partition board corresponding to the fourth through hole; the upper partition board and the lower partition board divide the drainage chamber into a water collection area above the upper partition board and a water storage area between the lower partition board and the first partition board; when the fifth through hole is coaxially arranged with the fourth through hole and the seventh through hole, the water collection area and the water storage area are communicated; when the fifth through hole completely deviates from the fourth through hole and the seventh through hole, the water collection area and the water storage area are blocked.

[0012] By setting the upper partition board and the lower partition board, it is used to divide the drainage chamber; by setting the rotating shaft, the movable board can rotate around the rotating shaft; by setting the handle, the user can rotate the movable board through the handle; when the handle rotates to one side of the sixth through hole, the fifth through hole is coaxially arranged with the fourth through hole and the seventh through hole, and the water collection area and the water storage area are communicated, and the water in the water collection area can be drained into the water storage area; when the handle rotates to the other side of the sixth through hole, the fifth through hole completely deviates from the fourth through hole and the seventh through hole, blocking the water collection area and the water storage area. By making the movable board contact with the upper partition board and the lower partition board, it can prevent the water flow from flowing out through the gap between the three.

[0013] Furthermore, a scale disk for measuring the valve opening degree is provided on the second valve.

[0014] By setting the scale disk on the second valve, the valve can be opened to a certain opening degree through the scale on the scale disk, so as to control the gas flow.

[0015] Furthermore, the housing is arranged on the base.

[0016] By setting up the base, the stability of the whole device can be improved, enabling the device to work smoothly.

[0017] A method for measuring gas flow by the drainage method includes the following steps:

[0018] Step 1: Connect the first port of the Y-shaped tube of the device to an external gas source, connect the second port of the Y-shaped tube to a gas-consuming device, open the rubber stopper, the first valve, and the third valve of the device, inject water into the air storage chamber through the water inlet and outlet of the device, with the water level not higher than the third port of the Y-shaped tube, and read the scale value where the liquid level is located as the initial reading.

[0019] Step 2: Rotate the movable plate through the handle to make the water collection area and the water storage area not communicate, close the third valve, open the second valve, and read the opening degree of the second valve through the external scale. Inject insoluble gas into the air storage chamber through the Y-shaped tube by the external gas source. After the gas enters the air storage chamber, the water in the air storage chamber enters the water storage area and the water collection area through the drain pipe.

[0020] Step 3: After ventilating for a period of time, close the second valve. At this time, the lower end of the drain pipe is still below the liquid level. Read the scale value where the liquid level is located at this time. The difference between the reading indicated by the liquid level at this time and the reading of the initial liquid level is the volume of gas entering the air storage chamber within the corresponding time. The value obtained by dividing this difference by the time is the gas flow value at the corresponding valve opening. If this flow value does not reach the predetermined value, while opening the third valve, rotate the movable plate through the handle to make the water collection area and the water storage area communicate, so that the water flowing out of the air storage chamber flows back into the air storage chamber. Then read the scale where the water flow is located at this time as the initial reading. Then close the third valve, refer to the gas flow value calculated previously, then open the second valve at a certain opening, and then repeat the above operation to obtain the corresponding flow value until the gas flow reaches the predetermined value, and read the opening degree of the second valve.

[0021] Step 4: When the gas flow reaches the predetermined value, close the first valve, open the third valve, and open the second valve at the opening obtained after the gas flow reaches the predetermined value, so that the external gas source is connected to the gas-consuming device, and the gas enters the gas-consuming device through the second valve at the corresponding flow value.

[0022] The beneficial effects of the present invention are:

[0023] This method uses a gas insoluble in water to control the intake air volume through the opening and closing degree of the second valve. After ventilating for a period of time, the volume of the discharged water is measured, and the flow rate of the gas is calculated. When the gas flow rate value reaches the preset value, the external gas source and the gas-using device are connected, and the gas with the corresponding flow rate is transported to the gas-using device, achieving the function of measuring and using immediately. The device of the present invention not only has the advantage of accurate measurement by the drainage method, but also overcomes the drawbacks that the drainage method cannot simultaneously measure, control the gas flow rate, and measure and use immediately. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shows the overall structural schematic diagram of the present invention.

[0025] Figure 2 Shows the structural schematic diagram of the Y-shaped tube.

[0026] Figure 3 Shows the structural schematic diagram of the second partition plate.

[0027] Parts, components and numbers in the figure: housing 1, Y-shaped tube 2, water inlet and outlet 3, U-shaped tube 4, water storage area 5, water collection area 6, gas storage chamber 7, second partition plate 8, upper partition plate 81, movable plate 82, handle 83, first valve 9, second valve 10, scale 11, third valve 12, first partition plate 13, drain pipe 14. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following gives the specific implementation method of the present invention, and clearly and completely describes the technical solution of the present invention in combination with the drawings. Obviously, the described embodiments are only the best embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] As Figure 1 and Figure 2As shown in the figure, a device for measuring gas flow by the drainage method includes a housing 1. The housing 1 is arranged on a base. There is a water inlet and drain port 3 at the top of the housing 1, and a rubber stopper capable of covering the water inlet and drain port 3 is provided in the water inlet and drain port 3. A first partition 13 is fixed in the housing 1. The first partition 13 divides the housing 1 into upper and lower parts, including an air storage chamber 7 located below the first partition 13 and a drainage chamber located above the first partition 13. On the part of the housing side wall where the air storage chamber 7 is located, scale lines for measuring the drained water volume are provided along the vertical direction on the outer side wall. There is a first through hole on the first partition 13, and a drain pipe 14 is fixed in the first through hole. The upper end of the drain pipe 14 communicates with the drainage chamber, and the lower end of the drain pipe 14 extends to one side close to the bottom plate of the housing 1. A first valve 9 is provided on the drain pipe 14. A second through hole is provided on the housing side wall at a position corresponding to the first valve 9. The operating handle of the first valve 9 extends out of the housing 1 through the second through hole, and the first valve 9 is sealingly connected to the second through hole. A third through hole is provided on the housing side wall. The third through hole is located below the first partition 13 and close to the first partition 13. A Y-shaped pipe 2 is provided in the third through hole. The first port of the Y-shaped pipe 2 can be connected to the pipeline of an external gas source. A second valve 10 is provided on the pipeline of the external gas source. A scale disk 11 for measuring the valve opening is provided on the second valve 10. The second port of the Y-shaped pipe 2 can be connected to the pipeline of a gas-using device. A third valve 12 is provided on the pipeline of the gas-using device. The third port of the Y-shaped pipe 2 is fixed in the third through hole.

[0031] As Figure 1 shown, one end of the first partition 13 far from the drain pipe 14 is bent upward in an L shape. The bent part of the first partition 13 and the side wall of the housing 1 together form an air inlet area of the air storage chamber 7. The third through hole where the Y-shaped pipe 2 is provided is opened on the part of the housing side wall in the air inlet area.

[0032] As Figure 1 shown, a second partition 8 is provided in the drainage chamber, dividing the drainage chamber into upper and lower parts, including a water collection area 6 located above the second partition 8 and a water storage area 5 located between the second partition 8 and the first partition 13. A U-shaped pipe 4 for communicating the water storage area 5 and the water collection area 6 is provided on the outer side wall of the housing 1. One pipe orifice of the U-shaped pipe 4 is arranged on the part of the housing side wall in the water storage area 5, and the other pipe orifice of the U-shaped pipe 4 is arranged on the part of the housing side wall in the water collection area 6.

[0033] As Figure 3As shown in the figure, the second partition plate 8 consists of three parts, including the upper partition plate 81, the movable plate 82 and the lower partition plate. The upper partition plate 81 is horizontally fixed on the inner side wall of the housing 1. A plurality of fourth through holes are provided on the upper partition plate 81. The movable plate 82 is arranged between the upper partition plate 81 and the lower partition plate, and the upper and lower surfaces of the movable plate 82 are respectively in contact with the upper partition plate 81 and the lower partition plate. A fifth through hole is provided at a position on the movable plate corresponding to the fourth through hole. A rotating shaft is provided on the movable plate 82. The movable plate 82 and the rotating shaft are coaxially arranged with the housing 1. The two ends of the rotating shaft are respectively rotatably connected to the upper partition plate 81 and the lower partition plate. A long strip-shaped sixth through hole is provided at a position on the side wall of the housing 1 corresponding to the movable plate 82. A handle 83 is arranged in the sixth through hole. One end of the handle 83 is connected to the movable plate, and the other end of the handle 83 extends out of the sixth through hole. The lower partition plate is horizontally fixed on the inner side wall of the housing 1. A seventh through hole is provided at a position on the lower partition plate corresponding to the fourth through hole. The upper partition plate and the lower partition plate divide the drainage chamber into a water collection area 6 above the upper partition plate and a water storage area 5 between the lower partition plate and the first partition plate 13. When the fifth through hole is coaxially arranged with the fourth through hole and the seventh through hole, the water collection area 6 and the water storage area 5 are communicated. When the fifth through hole completely deviates from the fourth through hole and the seventh through hole, the water collection area 6 and the water storage area 5 are blocked.

[0034] Embodiment 2

[0035] A method for measuring gas flow by the drainage method includes the following steps:

[0036] Step 1: Connect the first port of the Y-shaped tube of the device to an external gas source, connect the second port of the Y-shaped tube to a gas-using device, open the rubber stopper, the first valve 9 and the third valve 12 of the device, inject water into the gas storage chamber through the water inlet and outlet of the device, and the water level height is not higher than the third port of the Y-shaped tube. Read the scale value where the liquid level is located as the initial reading.

[0037] Step 2: Rotate the movable plate 82 through the handle 83 to make the water collection area 6 and the water storage area not communicate with each other. Close the third valve 12, open the second valve 10, and read the opening degree of the second valve through the external scale 11. Inject an insoluble gas into the gas storage chamber 7 through the Y-shaped tube 2 by the external gas source. After the gas enters the gas storage chamber 7, the water in the gas storage chamber enters the water storage area 5 and the water collection area 6 through the drain pipe 14.

[0038] Step 3, after ventilation for a period of time, close the second valve 10. At this time, the lower end of the drain pipe 14 is still below the liquid level. Read the scale value where the liquid level is located at this time. The difference between the reading indicated by the liquid level at this time and the reading of the initial liquid level is the volume of gas entering the gas storage chamber 7 within the corresponding time. The value obtained by dividing this difference by the time is the gas flow value at the corresponding valve opening. If this flow value does not reach the predetermined value, while opening the third valve 12, rotate the movable plate 82 through the handle 83 to connect the water collection area 6 and the water storage area 5, so that the water flowing out of the gas storage chamber 7 flows back into the gas storage chamber 7. Then read the scale where the water flow is located at this time as the initial reading. Then close the third valve 12, refer to the gas flow value calculated previously, then open the second valve 10 at a certain opening, and then repeat the above operation to obtain the corresponding flow value until the gas flow reaches the predetermined value, and read the opening of the second valve.

[0039] Step 4, when the gas flow reaches the predetermined value, close the first valve 9, open the third valve 12, and open the second valve 10 at the opening obtained after the gas flow reaches the predetermined value, so that the external gas source is connected to the gas-using device, and the gas enters the gas-using device through the second valve 10 at the corresponding flow value.

Claims

1. A device for measuring gas flow by the drainage method, characterized in that, It includes a housing (1). There is a water inlet and outlet (3) at the top of the housing (1). A rubber stopper capable of covering the water inlet and outlet (3) is provided in the water inlet and outlet (3). A first partition plate (13) is fixed in the housing (1). The first partition plate (13) divides the housing (1) into upper and lower parts, including an air storage chamber (7) located below the first partition plate (13) and a drainage chamber located above the first partition plate (13). On the part of the housing side wall where the air storage chamber (7) is located, scale lines for measuring the drainage volume are provided vertically on the outer side wall. A first through hole is provided on the first partition plate (13). A drain pipe (14) is fixed in the first through hole. The upper end of the drain pipe (14) communicates with the drainage chamber. The lower end of the drain pipe (14) extends to one side close to the bottom plate of the housing (1). A first valve (9) is provided on the drain pipe (14). A second through hole is provided at a position on the housing (1) side wall corresponding to the first valve (9). The operating handle of the first valve (9) extends out of the housing (1) through the second through hole, and the first valve (9) is hermetically connected to the second through hole. A third through hole is provided on the housing (1) side wall. The third through hole is located below the first partition plate (13) and close to the first partition plate (13). A Y-shaped pipe (2) is provided in the third through hole. The first port of the Y-shaped pipe (2) can be connected to the pipe of an external air source. A second valve (10) is provided on the pipe of the external air source. The second port of the Y-shaped pipe (2) can be connected to the pipe of a gas-using device. A third valve (12) is provided on the pipe of the gas-using device. The third port of the Y-shaped pipe (2) is fixed in the third through hole. A second partition plate (8) is provided in the drainage chamber, dividing the drainage chamber into upper and lower parts, including a water collection area (6) located above the second partition plate (8) and a water storage area (5) located between the second partition plate (8) and the first partition plate (13). A U-shaped pipe (4) for communicating the water storage area (5) and the water collection area (6) is provided on the outer side wall of the housing (1). One pipe orifice of the U-shaped pipe (4) is arranged on the part of the housing (1) side wall in the water storage area (5), and the other pipe orifice of the U-shaped pipe (4) is arranged on the part of the housing (1) side wall in the water collection area (6). The second partition plate (8) consists of three parts, including an upper partition plate (81), a movable plate (82), and a lower partition plate.

2. The device for measuring gas flow by the drainage method according to claim 1, wherein, The upper partition plate (81) is horizontally fixed on the inner side wall of the housing (1). A plurality of fourth through holes are provided on the upper partition plate (81). The movable plate (82) is arranged between the upper partition plate (81) and the lower partition plate, and the upper and lower surfaces of the movable plate (82) are respectively in contact with the upper partition plate (81) and the lower partition plate. A fifth through hole is provided at a position on the movable plate corresponding to the fourth through hole. A rotating shaft is provided on the movable plate (82). The movable plate (82) and the rotating shaft are coaxially arranged with the housing (1). The two ends of the rotating shaft are respectively rotatably connected to the upper partition plate (81) and the lower partition plate. A long strip-shaped sixth through hole is provided at a position on the housing (1) side wall corresponding to the movable plate (82). A handle (83) is provided in the sixth through hole. One end of the handle (83) is connected to the movable plate, and the other end of the handle (83) extends out of the sixth through hole. The lower partition board is fixedly arranged on the inner side wall of the housing (1) in the horizontal direction, and a seventh through hole is provided at a position on the lower partition board opposite to the fourth through hole; the upper partition board and the lower partition board divide the drainage chamber into a water collection area (6) above the upper partition board and a water storage area (5) between the lower partition board and the first partition board (13); When the fifth through hole is coaxially arranged with the fourth through hole and the seventh through hole, the water collection area (6) and the water storage area (5) are communicated; when the fifth through hole completely deviates from the fourth through hole and the seventh through hole, the water collection area (6) and the water storage area (5) are blocked.

3. The device for measuring gas flow by the drainage method according to claim 2, wherein, A scale plate (11) for measuring the valve opening degree is arranged on the second valve (10).

4. The device for measuring gas flow by the drainage method according to claim 3, wherein, The housing (1) is arranged on the base.

5. A method for measuring gas flow by the drainage method, characterized in that, A device for measuring gas flow by a drainage method according to claim 1, comprising the following steps: Step 1, connect the first port of the Y-shaped tube of the device to an external gas source, connect the second port of the Y-shaped tube to a gas-using device, open the rubber stopper, the first valve and the third valve of the device, inject water into the air storage chamber through the water inlet and outlet of the device, and the water level height is not higher than the third port of the Y-shaped tube, and read the scale value where the liquid level is located as the initial reading; Step 2, rotate the movable plate through the handle to make the water collection area and the water storage area not communicate with each other, close the third valve, open the second valve, and read the opening degree of the second valve through the external scale plate, and make the external gas source inject a gas insoluble in water into the air storage chamber through the Y-shaped tube. After the gas enters the air storage chamber, make the water in the air storage chamber enter the water storage area and the water collection area through the drain pipe; Step 3, after ventilating for a period of time, close the second valve. At this time, the lower end of the drain pipe is still below the liquid level, and read the scale value where the liquid level is located at this time. The difference between the reading indicated by the liquid level at this time and the reading of the initial liquid level is the volume of the gas entering the air storage chamber within the corresponding time. The value obtained by dividing this difference by the time is the gas flow value at the corresponding valve opening degree; if this flow value does not reach the predetermined value, while opening the third valve, rotate the movable plate through the handle to make the water collection area and the water storage area communicate, and make the water flowing out of the air storage chamber flow back to the air storage chamber, and then read the scale where the water flow is located at this time as the initial reading; then close the third valve, refer to the gas flow value calculated before, then open the second valve at a certain opening degree, and then repeat the above operation to obtain the corresponding flow value until the gas flow reaches the predetermined value, and read the opening degree of the second valve; Step 4, when the gas flow reaches the predetermined value, close the first valve, open the third valve, and open the second valve at the opening degree obtained after the gas flow reaches the predetermined value, so that the external gas source is communicated with the gas-using device, and make the gas enter the gas-using device through the second valve at the corresponding flow value.

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