CN214096233U - Device for measuring gas volume by indirect liquid discharge method - Google Patents

Abstract

The utility model provides a device of indirect flowing back method measurement gas volume, include: a support; an outer cylinder arranged on the bracket and comprising an upper cylinder part, a lower cylinder part and a bottom cover; an inner cylinder body which is opened downwards and is arranged in the lower cylinder part in a mode that the upper end surface of the inner cylinder body is inclined relative to the horizontal plane; the buffer pool is arranged on the outer side of the outer cylinder body; the liquid containing pool is positioned below the buffer pool; the weighing device is arranged below the liquid containing pool; a first gap is formed between the inner cylinder and the side wall of the lower cylinder, and a second gap is formed between the inner cylinder and the bottom cover; a liquid inlet for injecting liquid media is formed at the top of the upper cylinder part, and a liquid overflow port is formed below the liquid inlet; the top of the upper cylinder part is also inserted with an air inlet pipe and an air outlet pipe, the air outlet pipe is communicated with the top of the inner cylinder body, and the air inlet pipe extends into the opening of the inner cylinder body through a first gap and a second gap; the overflow port is connected with a buffer pool through an overflow pipe, the buffer pool is connected with a liquid containing pool through a liquid discharge pipe, and the tail end of the liquid discharge pipe is provided with a valve.

Description

Device for measuring gas volume by indirect liquid discharge method

Technical Field

The utility model belongs to the technical field of experimental facilities, concretely relates to device of indirect flowing back method measurement gas volume.

Background

In the scientific research experiment process, the volume of generated gas is often required to be measured in real time. Currently, techniques for measuring the reaction product gas include: gas flow meter method, liquid discharge method, vacuum-gas chromatography, constant volume pressure measurement method, etc.

For the gas flow meter method, there are many products available on the market, including: float flowmeters, wet gas flowmeters, MEMS flowmeters, turbine flowmeters, etc., wherein the float flowmeters are simple in device, but have a large error (about 10%), and are only applicable to flow measurement of pure gases, and have a larger error in measurement results for mixed gases, particularly mixed gases having a large difference in molecular weight; the MEMS flowmeter measures the gas flow indirectly by measuring the influence of the gas on the temperature field of the sensor when the gas flows through the sensor, is easy to intelligentize, but is expensive in equipment (a special sensor is needed), and is not suitable for measuring a small amount of gas in a laboratory; wet flow meter devices are simpler, but have lower sensitivity (> 5 mL/min) and higher price. For vacuum-gas chromatography, accurate measurement of laboratory gas volumes is commonly used, but is expensive due to the need for a gas chromatograph. For the constant volume pressure measurement method, the volume change is converted into the pressure change which is easier to measure through an ideal gas state equation, the method is easy to realize, but the gas is regarded as the ideal gas due to the need, and the error is large.

The liquid discharge method can be divided into a direct liquid discharge method and an indirect liquid discharge method, and is suitable for measuring the volume of gas which is insoluble in a medium liquid in a laboratory. The direct liquid discharge method generally limits the generated gas in a gas collection bag or an inverted container filled with liquid, and measures the volume of the gas by directly reading and measuring the change of the liquid level of an outer container, thereby limiting the measurement precision of an instrument (1 mL); the indirect drainage method is to measure the gas volume indirectly by measuring the mass or volume of the overflow liquid in the direct drainage method, however, the existing indirect drainage method volume measuring device cannot measure the gas volume continuously in real time.

SUMMERY OF THE UTILITY MODEL

Problem that utility model will solve:

in view of the above, an object of the present invention is to provide a device for measuring gas volume by indirect liquid discharge method, which can continuously measure gas volume in a large range and with high accuracy.

The technical means for solving the problems are as follows:

in order to solve the above problem, the utility model provides a device of indirect flowing back method measurement gas volume, include: a support; the outer cylinder body is arranged on the support and comprises an upper cylinder part, a lower cylinder part and a bottom cover; an inner cylinder that opens downward and is provided inside the lower cylinder such that an upper end surface thereof is inclined with respect to a horizontal plane; the buffer pool is arranged on the outer side of the outer cylinder body; the liquid containing pool is positioned below the buffer pool; the weighing device is arranged below the liquid containing pool; a first gap communicated with the upper barrel part is formed between the inner barrel and at least one part of the side wall of the lower barrel part, and a second gap communicated with the first gap is formed between the inner barrel and the bottom cover; a liquid inlet for injecting liquid media is formed at the top of the upper cylinder part, and a liquid overflow port is formed below the liquid inlet; the top of the upper cylinder part is also inserted with an air inlet pipe for introducing air and an air outlet pipe for discharging the air, the air outlet pipe is communicated with the top of the inner cylinder body, and the air inlet pipe extends into the opening of the inner cylinder body through the first gap and the second gap; the overflow port is connected with the buffer pool through an overflow pipe, the buffer pool is connected with the liquid containing pool through a liquid discharge pipe, and the tail end of the liquid discharge pipe is provided with a valve.

According to the utility model discloses, the up end slope of interior barrel sets up, helps gaseous assemble in the top of interior barrel under the induction of up end, thereby can prevent that gaseous when discharging gas is remained in the up end influence measuring degree of accuracy. Meanwhile, by arranging the buffer pool, the liquid medium overflowing from the overflow port can be continuously allowed when the valve is closed, namely, the gas is continuously allowed to enter the outer cylinder body, so that the gas pressure in the gas inlet pipe can be prevented from rising to cause danger when the valve is closed. By opening and closing the valve, real-time and continuous measurement of the gas volume can be realized.

Or, in the utility model, the lower port of the exhaust pipe is arranged at the highest position of the top of the inner cylinder body; the lower port of the air inlet pipe is positioned in the center of the opening of the inner cylinder body. Therefore, the gas entering the inner cylinder body can be converged at the highest position, and the gas is favorably discharged. The lower port of the air inlet pipe is close to the opening center of the inner cylinder body, so that gas can be prevented from entering the space between the outer cylinder body and the inner cylinder body through the second gap, and inaccurate measurement is caused.

In the present invention, the bottom surface of the buffer pool is inclined to one side, and a buffer pool liquid outlet is arranged at the lowest position of the bottom surface; the liquid discharge pipe is connected with the liquid discharge port of the buffer pool and the liquid containing pool. Therefore, the liquid medium can be prevented from remaining at the bottom of the buffer pool, and the measurement accuracy is improved.

Alternatively, in the present invention, the liquid medium may be a liquid immiscible with the gas; the inner surfaces of the overflow port, the overflow pipe, the buffer pool liquid outlet, the liquid outlet pipe and the valve are all surfaces with the property opposite to the hydrophilicity and hydrophobicity of the surface of the liquid medium. This makes it possible to measure all types of gases, prevent the liquid medium from remaining in various places, and further improve the measurement accuracy.

In the present invention, the inner cylinder may be fixed to the inside of the lower cylinder by a plurality of fasteners inserted through the side wall of the lower cylinder; the fastener is a bolt or a rivet.

Also, in the present invention, the valve is a ball valve.

Also, the utility model discloses in, the inclination of the up end of interior barrel is 5~ 20.

Also, in the present invention, the weighing device is an electronic balance.

The utility model has the advantages that:

the utility model discloses can be used for the accurate measurement of a large amount of gas volumes, can reduce direct drainage method measurement process's systematic error, improve measuring range, measurement accuracy and the degree of accuracy.

Drawings

Fig. 1 is a view showing a structure of an apparatus for measuring a gas volume by an indirect liquid discharge method according to an embodiment of the present invention in a half-sectional state;

description of the symbols: 1. an outer cylinder; 2. an upper cylinder part, 3, a lower cylinder part, 4 and a bottom cover; 5. an inner cylinder; 6. a liquid inlet; 7. an exhaust pipe; 8. an air inlet pipe; 9. an overflow port; 10. a liquid overflow pipe; 11. a buffer pool; 12. a liquid outlet of the buffer pool; 13. a liquid discharge pipe; 14. valves (ball valves); 15, a liquid containing pool; 16. a weighing device; 17. a support; A. a first gap; B. a second gap.

Detailed Description

The present invention is further described below in conjunction with the following embodiments and the accompanying drawings, it being understood that the drawings and the following embodiments are illustrative of the present invention only and are not limiting. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Disclosed is an apparatus for measuring a gas volume by an indirect liquid discharge method, which can continuously measure a gas volume in a large scale with high accuracy. Fig. 1 is a diagram showing a configuration of an apparatus for measuring a gas volume by an indirect liquid discharge method (hereinafter, simply referred to as "gas volume measuring apparatus") according to an embodiment of the present invention in a half-sectional state. The left half of fig. 1 shows the internal structure of the gas volume measuring device in a cross-sectional view, and the right half shows the external structure of the gas volume measuring device.

As shown in fig. 1, the gas volume measuring device includes an outer cylinder 1, an inner cylinder 5, a buffer tank 11, a liquid holding tank 15, a weighing device 16, and a bracket 17.

The outer cylinder 1 is hollow and formed into a substantially cylindrical shape 5. As shown in fig. 1, the outer cylinder 1 includes an upper cylinder 2, a lower cylinder 3, and a bottom cover 4, wherein the upper cylinder 2 is formed in a substantially circular truncated cone shape and mainly accommodates a liquid medium, and the lower cylinder 3 is formed in a substantially cylindrical shape and mainly accommodates the inner cylinder 5. Flanges having through holes are formed on the bottom end of the lower cylinder 3 and the periphery of the bottom cover 4, respectively, whereby the two can be sealingly connected by a fastener and a gasket.

The inner cylinder 5 is accommodated in the outer cylinder 1, specifically, in the lower cylinder 3, and the inner cylinder 5 is formed in an inverted cup shape with a hollow interior and a downward opening. In the present embodiment, the inner tube 5 is provided inside the lower tube 3 so as to be spaced apart from at least a part of the side wall of the lower tube 3 and the bottom cover 4. Specifically, a first gap a communicating with the inner space of the upper cylinder 2 is formed between the side wall of the inner cylinder 5 and the side wall of the lower cylinder 3, and the first gap a may be formed around the entire circumference of the inner cylinder 5 or may be formed along only a part of the circumference of the inner cylinder 5 (that is, the lower cylinder 3 and the inner cylinder 5 may be partially joined together by the side walls). On the other hand, a second gap B is formed between the lower end of the inner cylinder 5 and the bottom cap 4, and the inner space of the inner cylinder 5 communicates with the first gap a through the second gap B, and thus communicates with the inner space of the upper cylinder 2.

A plurality of (for example, 8) through holes are formed in the side wall of the lower tube 3, and a plurality of corresponding through holes or screw holes are also formed in the side wall of the inner tube 2, and the inner tube 2 is attached to the inside of the lower tube 3 as described above by inserting fasteners such as rivets or bolts through the through holes. It is also necessary to use a sealing member or sealant in conjunction with the fastener to ensure the sealing of the device when the inner barrel 2 is installed.

A liquid inlet 6 for injecting a liquid medium is formed in the top of the outer cylinder 1, i.e., the top of the upper cylinder 2. The liquid inlet 6 is formed in a small-diameter cylindrical shape and extends upward from the top of the upper cylinder 2, but the present invention is not limited thereto, and the liquid inlet 6 may be formed in another shape, and only the top opening of the upper cylinder 2 may be used as the liquid inlet 6 without providing any special device.

An exhaust pipe 7 for exhausting gas and an intake pipe 8 for introducing gas are inserted into the liquid inlet 6. As shown in fig. 1, the exhaust pipe 7 extends downward along the liquid inlet 6 and the inner wall of the upper cylinder 2 until it is inserted through the upper end surface of the inner cylinder 5, whereby the exhaust pipe 7 can exhaust the gas inside the inner cylinder 5 as needed. On the other hand, the gas inlet pipe 8 also extends downwards along the liquid inlet 6 and the inner wall of the upper cylinder part 2, and extends into the inner cylinder 5 through the first gap a and the second gap B, and the lower port of the gas inlet pipe 8 can be positioned at the center of the bottom opening of the inner cylinder 5, so that the gas with the volume to be measured can be injected into the inner space of the inner cylinder 5 from the outside through the gas inlet pipe 8, and the gas floats upwards to the top of the inner cylinder 5. The exhaust pipe 7 and the intake pipe 8 are not limited to being inserted into the outer cylinder 1 from the liquid inlet 6, and may be separately opened at the top of the upper cylinder 2 to allow the exhaust pipe 7 and the intake pipe 8 to be inserted therethrough.

In addition, the top of the outer cylinder 1 is further provided with an overflow port 9, and the overflow port 9 is formed below the liquid inlet 6 and used for discharging liquid media overflowing from the outer cylinder 1. The overflow port 9 is connected with a buffer pool 11 through an overflow pipe 10.

As shown in fig. 1, the buffer tank 11 is formed in a substantially ring shape, and is sleeved outside the outer cylinder 1 in a manner that an inner edge of a bottom surface is welded to an outer wall of the outer cylinder 1, and is mainly used for temporarily storing the liquid medium overflowing from the overflow port 9 when necessary. In the present embodiment, the bottom surface of the buffer tank 11 is inclined to one side, and a buffer tank drain port 12 is provided at the lowest position of the bottom surface. This ensures that all the liquid medium in the buffer tank 11 flows to the buffer tank drain port 12 located at the lowest position.

A drain pipe 13 connected to a liquid storage tank 15 is provided at the buffer tank drain port 12. At the lower end of the drain 13, i.e. the end connected to the reservoir 15, a valve 14 is arranged, which valve 14 may be a ball valve. Drain pipe 13 can be opened or closed by opening or closing valve 14. Below the liquid reservoir 15, a weighing device 16 is arranged, which weighing device 16 may be, for example, an electronic balance, and by taking a reading, the ratio of the reading to the density of the liquid medium is the volume of the gas to be measured.

The support 17 is mainly used for supporting the outer cylinder 1, and can be a truncated cone support with four corners high and low. In this embodiment, the outer cylinder 1 is disposed on the bracket 17 to be inclined to one side, and the inclination angle may be 5 to 20 °. Since the inner cylinder 5 is provided inside the outer cylinder 1, the inner cylinder 5 is also inclined to one side at the same angle, in other words, the upper end surface of the inner cylinder 5 is also inclined with respect to the horizontal plane. Meanwhile, the exhaust pipe 7 is preferably inserted through the upper end surface of the inner cylinder 5 at the highest point thereof. This can guide the gas introduced into the inner cylinder 5 to the highest position of the inner space of the inner cylinder 5, and facilitate the discharge of the gas through the gas discharge pipe 7 opened at the highest position.

The utility model discloses in, to the kind of the gas that needs await measuring, use and the liquid that is immiscible each other as liquid medium injection outer barrel 1. Meanwhile, in order to prevent the liquid medium flowing through from being smeared and remained on the pipe wall, besides the inclined arrangement of the bottom surface of the buffer pool 11, the inner surfaces of the overflow port 9, the overflow pipe 10, the buffer pool 11, the buffer pool liquid discharge port 12, the liquid discharge pipe 13 and the valve 14 are also arranged to be surfaces with the properties opposite to the hydrophilicity and hydrophobicity of the surface of the liquid medium. On the other hand, since the wall surfaces of the outer cylinder 1 and the inner cylinder 5 have no influence on the measurement accuracy, it may not be necessary to provide a surface having a property opposite to the hydrophilicity and hydrophobicity of the surface of the liquid medium. Thereby, the volume of all types of gases can be measured, and the liquid medium can be prevented from remaining everywhere, thereby affecting the measurement accuracy of the gas volume.

When the gas volume measuring device is used, the exhaust pipe 7 connected with the inner cylinder 5 is firstly sealed, and the liquid medium is filled into the outer cylinder 1 through the liquid inlet 6 until reaching the overflow port 9. Treat that the liquid level is stable after, with the gaseous leading-in outer barrel 1 inside of upper end opening through intake pipe 8 of awaiting measuring of generating from the outside, the inside of barrel 5 in this gaseous lower port entering of intake pipe 8 that is located the opening below of interior barrel 5. The gas floats to the top of the inner cylinder 5 due to its low specific gravity and is guided by the inclined upper end surface to converge at the highest point of the internal space, i.e., near the lower end opening of the exhaust pipe 7. Meanwhile, as the gas enters, the liquid medium inside the inner cylinder 5 is discharged and rushes toward the upper cylinder 2 through the second gap B and the first gap a, so that the liquid level of the upper cylinder 2 rises, and the liquid medium overflows from the overflow port 9. The overflowing liquid medium flows into the buffer tank 11 through the overflow pipe 10, and flows into the liquid receiving tank 15 through the liquid discharge pipe 13 provided at the bottom of the buffer tank 11. When a measurement record is required, the valve 14 is closed, the reading of the weighing device 16 is taken, and the gas volume at that time is obtained by dividing the reading by the density of the liquid medium. Thereafter, the gas volume at this time can be measured as described above by opening the valve 14 to discharge the liquid medium in the buffer tank 11 and closing the valve 14 when the measurement is to be continued. After the measurement experiment is finished, the closed exhaust pipe 7 is opened, gas gathered inside the inner cylinder 5 is discharged from the exhaust pipe 7, the liquid level of the outer cylinder 1 is lowered, the liquid level of the inner cylinder 5 is raised, liquid media consumed (discharged) is supplemented from the liquid inlet 6 until the liquid level reaches the height of the overflow port 9, and the next experiment can be started after the liquid level is stable.

According to the utility model discloses, the up end slope of interior barrel 5 sets up, helps gaseous assemble in the top of interior barrel 5 under the induction of up end, thereby can prevent when discharging gas gaseous remain in the up end influence next measuring degree of accuracy (please confirm whether this beneficial effect is correct). Meanwhile, by providing the buffer tank 11, the liquid medium overflowing from the overflow port 9 can be continuously allowed when the valve 14 is closed, that is, the gas can be continuously allowed to enter the outer cylinder 1, so that the gas pressure in the gas inlet pipe 8 can be prevented from increasing when the valve 14 is closed, which causes danger. Moreover, the inclined bottom surface of the buffer tank 11 also helps to prevent the liquid medium from remaining on the bottom of the buffer tank 11 to affect the accuracy of measurement. In addition, by opening and closing the valve 14, real-time, continuous measurement of the gas volume can be achieved.

In addition, by using as the liquid medium a liquid that is immiscible with the gas to be measured, measurements can be made for all types of gases. By providing the inner surfaces of the respective members in the gas volume measuring device as surfaces having properties opposite to the hydrophilicity and hydrophobicity of the surface of the liquid medium, the liquid medium can be prevented from remaining everywhere, so that the measurement accuracy of the gas volume can be further improved. Compared with a direct drainage method, the gas volume measuring device can be used for accurately measuring the volume of a large amount of gas, can reduce the system error in the measuring process of the direct drainage method, and improves the measuring range, the measuring precision and the measuring accuracy.

[ other embodiments ]

The gas volume measuring device in which the inner cylinder 5 and the outer cylinder 1 are inclined together has been described above, but the present invention is not limited thereto. For example, the outer cylinder 1 may be vertically placed on the bracket 17, and the inner cylinder 5 may be attached to the inside of the lower cylinder 3 such that the upper end surface thereof is inclined at a predetermined angle with respect to the horizontal plane. The inner tubular body 2 is not limited to being attached to the inside of the lower tubular portion 3 by a fastener, and may be directly welded to the inner wall of the lower tubular portion 3. The upper tube 2 is not limited to a circular truncated cone shape, and may have another shape. The buffer tank 11 may be provided integrally with the outer cylinder 1 or separately from the outer cylinder, and the shape of the buffer tank 11 is not limited to a ring shape.

The above embodiments have been described in further detail to illustrate the objects, technical solutions and advantages of the present invention, and it should be understood that the above is only a specific embodiment of the present invention, and is not limited to the scope of the present invention, and the present invention can be embodied in various forms without departing from the spirit of the essential characteristics of the present invention, so that the embodiments of the present invention are intended to be illustrative and not restrictive, since the scope of the present invention is defined by the claims rather than the specification, and all changes that fall within the range defined by the claims or the range equivalent thereto are intended to be embraced by the claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A device for measuring gas volume by indirect liquid discharge method is characterized in that,

the method comprises the following steps:

a support;

the outer cylinder body is arranged on the support and comprises an upper cylinder part, a lower cylinder part and a bottom cover;

an inner cylinder that opens downward and is provided inside the lower cylinder such that an upper end surface thereof is inclined with respect to a horizontal plane;

the buffer pool is arranged on the outer side of the outer cylinder body;

the liquid containing pool is positioned below the buffer pool; and

the weighing device is arranged below the liquid containing pool;

a first gap communicated with the upper barrel part is formed between the inner barrel and at least one part of the side wall of the lower barrel part, and a second gap communicated with the first gap is formed between the inner barrel and the bottom cover;

a liquid inlet for injecting liquid media is formed at the top of the upper cylinder part, and a liquid overflow port is formed below the liquid inlet;

the top of the upper cylinder part is also inserted with an air inlet pipe for introducing air and an air outlet pipe for discharging the air, the air outlet pipe is communicated with the top of the inner cylinder body, and the air inlet pipe extends into the opening of the inner cylinder body through the first gap and the second gap;

the overflow port is connected with the buffer pool through an overflow pipe, the buffer pool is connected with the liquid containing pool through a liquid discharge pipe, and the tail end of the liquid discharge pipe is provided with a valve.

2. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the lower port of the exhaust pipe is arranged at the highest position of the top of the inner cylinder body;

the lower port of the air inlet pipe is positioned in the center of the opening of the inner cylinder body.

3. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the bottom surface of the buffer pool is obliquely arranged towards one side, and a buffer pool liquid outlet is arranged at the lowest position of the bottom surface;

the liquid discharge pipe is connected with the liquid discharge port of the buffer pool and the liquid containing pool.

4. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the liquid medium is a liquid immiscible with the gas;

the inner surfaces of the overflow port, the overflow pipe, the buffer pool, the drain pipe and the valve are all surfaces with the property opposite to the hydrophilicity and hydrophobicity of the surface of the liquid medium.

5. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the inner cylinder is fixed inside the lower cylinder part through a plurality of fasteners inserted through the side wall of the lower cylinder part;

the fastener is a bolt or a rivet.

6. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the valve is a ball valve.

7. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the inclination angle of the upper end face of the inner cylinder body is 5-20 degrees.

8. The apparatus for measuring a volume of a gas according to the indirect liquid discharge method of claim 1,

the weighing device is an electronic balance.

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