Gas micro-flow measuring device

Abstract

The utility model discloses a gas micro-flow measuring device, which relates to the field of gas flow measurement, is used for solving the technical problem that the micro-gas flow cannot be accurately measured in the prior art, and comprises a water tank, a vacuum pump and a back plate, the cover plate is provided with a measuring cylinder, a barometer, a regulating valve and a motor, the water tank is provided with an air inlet pipe, the air inlet pipe is connected with the barometer and the regulating valve, the bottom of the measuring cylinder is open, the top of the measuring cylinder is connected with the vacuum pump through an air pipe, a check valve is arranged between the measuring cylinder and the vacuum pump, and the measuring cylinder is provided with length scales and volume scales. The motor is provided with a connecting rod, and the connecting rod is connected with the gas inlet pipe. Compared with the prior art, the gas flow meter has the beneficial effects that the micro flow of gas can be accurately measured; and through the combination of the pull rod and the pulley, the device is very convenient to move.

Description

Technical Field

[0001] The utility model relates to the field of gas flow measurement, in particular to a gas micro-flow measurement device. Background Art

[0002] Due to the particularity of tiny gas flow, the measurement of tiny gas flow is a technical problem to be solved. Various volumetric, velocity, differential pressure and other forms of flow meters are more widely used and mature in measuring large flow, but the measurement accuracy is not enough for tiny gas flow measurement. Under standard working conditions, the currently known gas flow measurement range is above 20ml / min, and there is a lack of mature measurement equipment for measuring flow below 20ml / min. Utility Model Content

[0003] The utility model discloses a gas micro-flow measuring device, which is used to solve one of the above technical problems.

[0004] A gas micro-flow measurement device comprises a water tank, the water tank is provided with a cover plate, a water inlet and a water outlet, and also comprises a vacuum pump and a back plate; the cover plate is provided with a measuring cylinder, a barometer, a regulating valve and a motor; the water tank is provided with an air inlet pipe, the air inlet pipe is connected to the barometer and the regulating valve; the bottom of the measuring cylinder is open, the top of the measuring cylinder is connected to the vacuum pump through an air pipe, a stop valve is provided between the measuring cylinder and the vacuum pump, the measuring cylinder is provided with a length scale and a capacity scale, the motor is provided with a connecting rod, and the connecting rod is connected to the air inlet pipe.

[0005] Furthermore, there are three measuring cylinders, the measuring ranges of the measuring cylinders are different, and the measuring cylinders are distributed around a circle with the connecting rod as the center.

[0006] Furthermore, a pulley is provided at the bottom of the water tank.

[0007] Furthermore, a pulling device is provided on the back plate, and the pulling device is a handle or a pull rod.

[0008] Furthermore, it also includes a digital display screen, which is arranged on the cover plate or the back plate. The barometer is a gas pressure sensor, and the digital display screen is electrically connected to the barometer, the motor and the vacuum pump.

[0009] Compared with the prior art, the utility model has the following beneficial effects: it can accurately measure the minute flow of gas; and through the combination of the pull rod and the pulley, the utility model is very convenient to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the utility model.

[0011] Figure 2 It is a schematic diagram of the utility model.

[0012] Figure numerals: 1. water tank, 2. cover plate, 3. water inlet, 4. water outlet, 5. back plate, 6. vacuum pump, 7. measuring cylinder, 8. pressure gauge, 9. regulating valve, 10. motor, 11. air inlet pipe, 12. stop valve, 13. connecting rod, 14. pulley, 15. pulling device. DETAILED DESCRIPTION

[0013] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features.

[0014] In the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0016] A gas micro-flow measurement device comprises a water tank 1, wherein the water tank 1 is provided with a cover plate 2, a water inlet 3 and a water outlet 4, and also comprises a vacuum pump 6 and a back plate 5; the cover plate 2 is provided with a measuring cylinder 7, a barometer 8, a regulating valve 9 and a motor 10; the water tank 1 is provided with an air inlet pipe 11, wherein the air inlet pipe 11 is connected to the barometer 8 and the regulating valve 9; the bottom of the measuring cylinder 7 is open, the top of the measuring cylinder 7 is connected to the vacuum pump 6, a stop valve 12 is provided on the top of the measuring cylinder 7, the measuring cylinder 7 is provided with a length scale and a capacity scale, the motor 10 is provided with a connecting rod 13, and the connecting rod 13 is connected to the air inlet pipe 11; the number of the measuring cylinders 7 is three, the measuring ranges of the measuring cylinders 7 are different, and the measuring cylinders 7 are distributed around the connecting rod 13 as the center.

[0017] When in use, water is injected from the water inlet 3. When the water level is above a certain height of the bottom opening of the measuring cylinder 7, the water injection is stopped. The air inlet pipe 11 is connected to the pipeline where the flow rate needs to be detected. The vacuum pump 6 is started to extract the gas in the measuring cylinder 7. The stop valve 12 is closed and the reading a of the measuring cylinder 7 is recorded. The motor 10 is started. The motor 10 rotates through the connecting rod 13 to align the outlet end of the air inlet pipe 11 with the position outside the opening of the measuring cylinder 7. The regulating valve 9 is opened, and the gas enters the air inlet pipe 11 and exhausts to the outside. The purpose of this step is to wait for the gas flow to stabilize and be able to be discharged stably from the air inlet pipe 11 before measuring. Observe the reading of the barometer 8. After the gas flow pressure is stable and can be discharged from the air inlet pipe 11, start the motor 10 to align the air outlet of the air inlet pipe 11 with the measuring cylinder 7 and start timing. After the specified time t is reached, the motor 10 is started to move the air outlet of the air inlet pipe 11 away from the measuring cylinder 7. Read the pressure reading P of the barometer 8, the height difference c between the liquid level of the measuring cylinder 7 and the liquid level of the water tank, and the reading b of the measuring cylinder 7, and calculate the flow rate L=(101.3-9.8*c)*(ba) / P*t through the formula. Among them, a is the reading in the measuring cylinder 7 before measurement, b is the gas reading in the measuring cylinder 7 at the end of measurement, c is the height difference between the liquid level of the measuring cylinder 7 and the liquid level of the water tank at the end of measurement, P is the pressure reading P of the barometer 8, and t is the test time.

[0018] As a preferred embodiment, a pulley 14 is provided at the bottom of the water tank 1, and a pulling device 15 is provided on the back plate 5. The pulling device 15 is a handle or a pull rod. The pulling device 15 and the pulley 14 can be used to conveniently move the utility model.

[0019] As a preferred embodiment, it also includes a digital display screen, which is arranged on the cover plate 2 or the back plate 5. The barometer 8 is a gas pressure sensor, and the digital display screen is electrically connected to the gas pressure sensor, the motor 10, and the vacuum pump 6. The digital display screen can time and control the operation of the motor 10, the digital display screen can read the reading of the gas pressure sensor and display it, and the digital display screen can control the start and stop of the vacuum pump 6. The flow rate L can be obtained by inputting the readings of c, b, and a into the digital display screen.

[0020] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A gas micro-flow measurement device, comprising a water tank (1), wherein the water tank (1) is provided with a cover plate (2), a water inlet (3) and a water outlet (4), and characterized in that: It also comprises a vacuum pump (6) and a back plate (5); the cover plate (2) is provided with a measuring cylinder (7), a pressure gauge (8), a regulating valve (9) and a motor (10); the water tank (1) is provided with an air intake pipe (11), the air intake pipe (11) is connected to the pressure gauge (8) and the regulating valve (9); the bottom of the measuring cylinder (7) is open, the top of the measuring cylinder (7) is connected to the vacuum pump (6) through an air pipe, a stop valve (12) is provided between the measuring cylinder (7) and the vacuum pump (6), the measuring cylinder (7) is provided with a length scale and a capacity scale, and the motor (10) is provided with a connecting rod (13), the connecting rod (13) is connected to the air intake pipe (11).

2. A gas micro flow measurement device according to claim 1, characterized in that: The number of the measuring cylinders (7) is three, the measuring ranges of the measuring cylinders (7) are different, and the measuring cylinders (7) are distributed around a circle with the connecting rod (13) as the center.

3. A gas micro flow measurement device according to claim 1, characterized in that: A pulley (14) is provided at the bottom of the water tank (1).

4. A gas micro flow measurement device according to claim 3, characterized in that: A pulling device (15) is provided on the back plate (5), and the pulling device (15) is a handle or a pull rod.

5. A gas micro flow measurement device according to claim 1, characterized in that: It also includes a digital display screen, which is arranged on the cover plate (2) or the back plate (5); the barometer (8) is a gas pressure sensor; and the digital display screen is electrically connected to the barometer (8), the motor (10) and the vacuum pump (6).

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