CN214010445U

CN214010445U - Gas meter

Info

Publication number: CN214010445U
Application number: CN202023029417.0U
Authority: CN
Inventors: 代军; 汤勇; 胡世莱; 唐良睿; 刘昕; 陈玉林; 罗豫龙
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-08-20
Anticipated expiration: 2030-12-16

Abstract

The utility model relates to a gas meter, including air inlet, first gas vent and second gas vent, leakage fluid dram, vapour and liquid separator, check valve, first pneumatic valve and second pneumatic valve, displacement measurement sensor, piston, over-range sensor, gas container, relief valve, signal processing system and control system. A gas-liquid separator is arranged between the gas inlet and the first pneumatic valve, the pneumatic valve is connected to the two ends of the gas container through a pipeline, the safety valve is connected to the arc-shaped part of the bottom of the left side of the gas container through a pipeline, and a piston, a displacement metering sensor and an over-range sensor are arranged inside the two sides of the gas container. The displacement measuring sensor and the over-range sensor transmit the received signals to the signal processing system, and the processing result is fed back to the pneumatic valve and the safety valve through the computer control system, so that the piston can reciprocate up and down. The utility model discloses simple structure can ensure the gaseous accurate measurement of low discharge and can carry out automatic measurement and reliable as a result to a large amount of gases again, establishes the security that safety structure has guaranteed whole device in.

Description

Gas meter

Technical Field

The utility model relates to a gaseous measurement technical field in the laboratory, specific is a gaseous counter.

Background

For gas metering in a laboratory, two modes of water drainage metering and metering by a metering device are generally selected. Drainage method measurement often needs to occupy certain labour and energy of experimenter, and has more human error hidden danger, has corresponding requirement restriction to the gas that is metered simultaneously. Ordinary metering device is difficult to accurate measurement small flow gas on the one hand, and on the other hand has the range restriction, is difficult to realize the measurement of extensive gas, needs to realize the measurement to whole process through pause experiment, switching flow, and the measurement result relies on artifical the reading, produces great error easily, in addition, lacks effective safety structure and also is the comparatively obvious defect that this type of metering device exists. Although the partial metering device can realize continuous metering of the gas, a separate exhaust operation flow is required, and the complexity of the metering process is increased. Instruments and devices for gas metering in the market have abundant varieties, wherein high-precision, automatic and digital metering equipment is not lacked, but most instruments are expensive and have low cost performance.

Therefore, how to solve the defects of the existing gas metering mode and metering device, the gas metering device which has the advantages of simple structure and convenient operation, can accurately meter small-flow gas, can break through the range limitation, realizes the automatic metering of a large amount of gas, and can ensure the accuracy of a metering result and the safety in the metering process is the technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas meter, the device simple structure, convenient operation, can accurate measurement low discharge gas can not shut down again and last the measurement in order to break through the range restriction, realizes a large amount of gaseous automatic measurement, can also guarantee the accuracy of measurement result and the security of measurement process simultaneously to overcome the background the device defect.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

A gas meter comprises a gas inlet, a first gas outlet, a second gas outlet, a liquid outlet, a gas-liquid separator, a one-way valve, a first pneumatic valve, a second pneumatic valve, a displacement metering sensor, a piston, an over-range sensor, a gas container, a safety valve, a signal processing system and a computer control system, wherein the gas inlet is connected with the lower part of the gas-liquid separator, the one-way valve is arranged between the gas inlet and the lower part of the gas-liquid separator, the liquid outlet is connected with the bottom of the gas-liquid separator, a mist catcher is arranged at the gas outlet end in the gas-liquid separator, the top of the gas-liquid separator is connected with the first pneumatic valve through a pipeline and then is respectively connected with the two ends of the gas container, the first gas outlet and the second pneumatic valve are connected with the two ends of the gas container through pipelines, and the second gas outlet and the safety valve are connected with the arc-shaped part at the bottom of the left side of the gas container through a pipeline; pistons are respectively arranged in the two sides of the gas container, displacement metering sensors are respectively arranged on the pipe walls of the two sides of the gas container, and over-range sensors are respectively arranged at the tail ends of the displacement metering sensors; a sealing washer, a graphite washer and a metal washer are sequentially arranged in the piston; the gas container is fixed on the bracket, and the whole structure except the gas inlet and the gas outlet is enclosed in the box body; the displacement metering sensor and the over-range sensor transmit the received signals to the signal processing system, and the processing result is fed back to the pneumatic valve and the safety valve through the computer control system.

According to the position of the piston, the initial sensing distance of the piston is h₀The computer control system judges the relative height of the piston position, gas enters from one side of a gas container with the relative high piston position from the gas inlet to the ports a and b (ports a and c) of the first pneumatic valve 4 through the gas-liquid separator, the two pistons are simultaneously pushed, the piston at one side of the gas inlet descends, the piston at the other side ascends, and then gas at the upper part of the piston is discharged from the other side of the gas container through the ports a and c (ports a and b) of the second pneumatic valve;when the descending piston reaches the termination point, the gas enters the other side of the gas container through the other ports a and c (ports a and b) of the first pneumatic valve, and pushes the two pistons simultaneously, the descending piston becomes ascending, the ascending piston becomes descending, and the gas is discharged from the ports a and b (ports a and c) of the second pneumatic valve; the displacement measurement sensor senses the position of the piston and outputs a signal, the total sensing distance of the piston in the measurement process is sigma h, the measurement time is delta t, and the gas volume and the gas flow can be calculated according to a formula:

Q＝9π(∑h-h₀)

Figure 512036DEST_PATH_GDA0003152851310000021

wherein Q represents the volume of the metered gas; v represents the flow rate of the metering gas; Δ Q represents the cumulative metered gas volume over time Δ t; Δ t represents a metering time.

The metering accuracy of the small-flow gas can be fully guaranteed according to the gas volume calculation formula and the gas flow calculation formula. Meanwhile, the up-and-down reciprocating motion of the piston can realize continuous measurement of a large amount of gas without stopping working, the measurement of the volume of the gas to be measured is not limited, and the change rules of the volume and the flow of the gas in the whole experiment process can be completely recorded.

Preferably, a mist catcher is installed at the air outlet end in the gas-liquid separator, small droplets carried by air can be separated and condensed, and a one-way valve is arranged between the gas-liquid separator and the air inlet, so that liquid in the gas-liquid separator can be effectively prevented from flowing back.

Preferably, the two sides of the gas container are symmetrical, the piston, the displacement metering sensor and the over-range sensor are assembled in the gas container and used for recording the moving distance of the piston pushed by gas, and the signal processing system transmits the recorded data volume of the moving distance of the piston to the computer control system, wherein the data volume is 5 per second.

Preferably, the gas filled between the two pistons of the gas container is nitrogen.

Preferably, the over-range sensor and the safety valve are matched for use, so that the safety of the metering process can be effectively ensured.

Preferably, the inner diameter and the outer diameter of the gas container are respectively 6cm and 7cm, the maximum distance for the single-side piston to move and measure is 70.736cm (namely the distance from the starting point to the ending point is 70.736cm), the minimum measurement scale is 0.02mm, the minimum precision of the gas measurement is 0.5655mL, the single-side volume of the gas container is 2000mL, and the total volume of the gas container is 4000 mL.

Preferably, the inner diameters of the sealing washer, the graphite washer and the metal washer of the piston assembly are all 5cm, the outer diameters of the sealing washer, the graphite washer and the metal washer are respectively 6.2cm, 5.8cm and 6.1cm, the thicknesses of the sealing washer, the graphite washer and the metal washer are respectively 0.6cm, 0.4cm and 0.55cm, the sealing washer plays a sealing role, the graphite washer plays a role in blocking the sealing washer and the metal washer, and the metal washer is in contact with the displacement metering sensor to transmit a piston position signal.

Preferably, the length, the width and the height of the box body are respectively 30cm, 17cm and 100 cm.

The utility model discloses following beneficial effect has:

1. structural design is simple, can realize automatic measurement work, and signal processing system notes the distance that the piston removed and can carry out the measurement to gas, need not reset the operation when reusing the device, can effectively reduce the metering error that the manual operation process brought for the metering result is more accurate reliable.

2. The piston can do up-and-down reciprocating motion in the gas container under the condition of near atmospheric pressure, and the exhaust is realized to simplify the operation flow while admitting air, thereby realizing continuous measurement without stopping working of a large amount of gas, simultaneously recording the gas volume of different time periods and the gas flow of different time periods, effectively solving the defect of small measuring range of partial gas meters, and in addition, sufficient precision and digital measurement can fully ensure the measuring accuracy of small-flow gas.

3. The safety valve greatly improves the safety of the device, and avoids the damage to the whole device and the injury to experimenters caused by the over-range of the unilateral piston.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the gas container according to the present invention.

Fig. 3 is a schematic view of the piston structure of the present invention.

In the figure, 1-air inlet, 2-first exhaust port, 3-second exhaust port, 4-first pneumatic valve, 5-second pneumatic valve, 6, 7-piston, 8, 9-displacement metering sensor, 10-gas container, 11, 12-over-range sensor, 13-safety valve, 14-bracket, 15-box, 16-computer control system, 17-sealing gasket, 18-graphite gasket, 19-metal gasket, 20-mist catcher, 21-gas-liquid separator, 22-one-way valve and 23-liquid outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 3, a gas meter is composed of a gas inlet 1, a first gas outlet 2, a second gas outlet 3, a liquid outlet 23, a gas-liquid separator 21, a check valve 22, first and second

pneumatic valves

4 and 5, pistons 6 and 7, displacement measuring sensors 8 and 9, a gas container 10, over-range sensors 11 and 12, a safety valve 13, a support 14, a case 15, a computer control system 16, and a signal processing system.

Wherein, the air inlet 1 is connected with the lower part of the gas-liquid separator 21 and a check valve 22 is arranged between the air inlet 1 and the lower part of the gas-liquid separator 21, the liquid outlet 23 is connected with the bottom of the gas-liquid separator 21, the gas outlet end in the gas-liquid separator 21 is provided with a mist catcher 20, the top of the gas-liquid separator 21 is connected with the first pneumatic valve 4 through a pipeline and then respectively connected with the two ends of the gas container 10, the first exhaust port 2 and the second pneumatic valve 5 are connected through a pipeline and then respectively connected with the two ends of the gas container 10, and the second exhaust port 3 is connected with the safety valve 13 through a pipeline and then connected with the left bottom arc part of the gas container 10; pistons 6 and 7 are respectively arranged in the two sides of the gas container 10, displacement metering sensors 8 and 9 are respectively arranged on the inner pipe wall, the tail ends of the displacement metering sensors 8 and 9 are respectively provided with an over-range sensor 11 and 12, and a sealing gasket 17, a graphite gasket 18 and a metal gasket 19 are sequentially arranged in the pistons; the gas container 10 is fixed to the support 14, and the entire structure except for the gas inlet 1, the first and

second gas outlets

2, 3, and the liquid outlet 23 is enclosed in the case 15.

Wherein, the inner diameter of the gas container 10 is 6cm, the maximum distance of the single-side piston moving measurement is 70.736cm, namely the sensing distance from the starting point to the ending point of the displacement measurement sensor 8 or 9 is 70.736cm, the minimum measurement scale is 0.02mm, the minimum precision of the gas measurement is 0.5655mL, the single-side volume of the gas container 10 is 2000mL, and the total volume of the gas container 10 is 4000 mL; the displacement gage sensors 8 and 9 and the over-range sensors 11 and 12 transmit the received signals to the signal processing system, and feed back the processing results to the air-operated

valves

4 and 5 and the safety valve 13 through the computer control system 16.

Use the utility model discloses an embodiment when carrying out gas measurement, concrete process is:

the piston 6 is located at the starting point A1 on the left side of the gas container 10, the piston 7 is located at the ending point Z2 on the right side of the gas container 10, signals are transmitted to the signal processing system by the displacement metering sensors 8 and 9, the computer control system 16 judges that the port a and the port b of the first pneumatic valve 4 are opened, the port c is closed, the port a and the port c of the second pneumatic valve 5 are opened, the port b is closed, gas enters the left side of the gas container 10 from the port a and the port b of the first pneumatic valve 4 through the gas-liquid separator 21, the piston 6 and the piston 7 are pushed simultaneously, the piston 6 descends, the piston 7 ascends, and the displacement metering sensors 8 and 9 monitor the positions of the pistons 6 and 7 and output signals so as to meter the gas.

When the piston 6 descends to the end point Z1, the piston 7 ascends to the starting point A2, the computer control system 16 controls the port a and the port c of the first air-operated valve 4 to be opened and the port b to be closed, the port a and the port b of the second air-operated valve 5 to be opened and the port c to be closed, gas enters the right side of the gas container 10 from the port a and the port c of the air-operated valve 4 through the gas-liquid separator 21 from the gas inlet 1, the piston 7 and the piston 6 are pushed simultaneously, the piston 7 descends, the piston 6 ascends, and the displacement metering sensors 8 and 9 monitor the positions of the pistons 6 and 7 and output signals so as to meter the gas.

When the piston 6 or 7 descends to exceed the termination point Z1 or Z2, the over-range sensor 11 or 12 is triggered, the safety valve 13 is opened, and gas between the pistons 6 and 7 is discharged, so that the whole metering device is prevented from being damaged.

The maximum gas amount metered by the single-side gas container is 2000mL, namely the gas amount when the piston 6 descends from the starting point A1 to the ending point Z1 is 2000mL (the gas amount when the piston 7 descends from the starting point A2 to the ending point Z2 is 2000 mL). Although the maximum volume of the single-sided gas container is 2000mL, the piston can reciprocate up and down in the gas container, thereby realizing the metering of a large amount of gas.

The above description is only for the purpose of illustrating specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are all covered by the scope of the present invention.

Claims

1. The utility model provides a gas meter, includes air inlet (1), first gas vent (2), second gas vent (3), leakage fluid dram (23), vapour and liquid separator (21), check valve (22), first pneumatic valve (4), second pneumatic valve (5), piston (6, 7), displacement measurement sensor (8, 9), gas container (10), overranging sensor (11, 12), relief valve (13), support (14), box (15), computer control system (16) and signal processing system, its characterized in that: the gas inlet (1) is connected with the lower part of the gas-liquid separator (21) and a check valve (22) is arranged between the gas inlet and the lower part of the gas-liquid separator, the liquid outlet (23) is connected with the bottom of the gas-liquid separator (21), the gas outlet end of the gas-liquid separator (21) is provided with a mist catcher (20), the top of the gas-liquid separator (21) is connected with the first pneumatic valve (4) through a pipeline and then respectively connected with the two ends of the gas container (10), and the first gas outlet (2) and the second pneumatic valve (5) are connected through a pipeline and then respectively connected with the two ends of the gas container (10).

2. A gas meter according to claim 1, wherein: the gas container (10) is bilaterally symmetrical, the inner diameter and the outer diameter of the gas container are respectively 6cm and 7cm, pistons (6 and 7) are respectively arranged in the gas container, displacement metering sensors (8 and 9) are respectively arranged on the pipe wall of the gas container, and over-range sensors (11 and 12) are respectively arranged at the tail ends of the displacement metering sensors.

3. A gas meter according to claim 1 or 2, wherein: the pistons (6 and 7) are matched with a sealing washer (17), a graphite washer (18) and a metal washer (19), the inner diameters of the pistons are 5cm, and the outer diameters of the pistons are 6.2cm, 5.8cm and 6.1cm respectively.

4. A gas meter according to claim 1 or 2, wherein: the maximum distance of the single-side piston of the gas container (10) in moving and metering is 70.736cm, the minimum metering scale is 0.02mm, the minimum precision of gas metering is 0.5655mL, the measuring range of the single-side gas container is 2000mL, and the total measuring range of the gas container is 4000 mL;

wherein the gas volume calculation formula contained in the gas container (10) is as follows:

Q＝9π(∑h-h₀)

wherein Q represents the volume of the measurement gas; Σ h represents the total sensing distance of the piston; h is₀Indicating the piston's initial sensing distance.

5. A gas meter according to claim 1, wherein: and a safety valve (13) is arranged outside the arc-shaped container at the bottom of the left side of the gas container (10) and is connected with the second exhaust port (3) through a pipeline.

6. A gas meter according to claim 1, wherein: the displacement metering sensors (8, 9) and the over-range sensors (11, 12) transmit the received signals to the signal processing system, and the processing results are fed back to the first pneumatic valve (4), the second pneumatic valve (5) and the safety valve (13) through the computer control system (16).