CN217006567U - Automatic sampling device of gas collection bag - Google Patents
Automatic sampling device of gas collection bag Download PDFInfo
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- CN217006567U CN217006567U CN202220624760.XU CN202220624760U CN217006567U CN 217006567 U CN217006567 U CN 217006567U CN 202220624760 U CN202220624760 U CN 202220624760U CN 217006567 U CN217006567 U CN 217006567U
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Abstract
The utility model discloses an automatic sampling device for a gas collection bag, and belongs to the field of gas collection and detection. The method comprises the following steps: the elastic cavity is provided with an opening, the upper end of the elastic cavity is provided with an opening, the opening is sealed by an upper cover, and the upper cover is provided with a mounting hole; the gas collection cover plate is hermetically connected to the mounting hole of the upper cover; a gas collecting connecting pipe penetrates through the gas collecting cover plate, a first end of the gas collecting connecting pipe is connected with a gas collecting bag, a second end of the gas collecting connecting pipe is connected with a sampling pipe, and the gas collecting bag is located in the elastic cavity; the air pump is used for pumping the gas in the elastic cavity; and the detection assembly comprises a pressure sensor for detecting the internal pressure of the elastic cavity and a temperature sensor for detecting the internal temperature of the elastic cavity. The utility model solves the problem that the automatic sampling device of the gas collection bag can not accurately detect the gas volume.
Description
Technical Field
The utility model relates to the field of gas collection bag sampling, in particular to an automatic gas collection bag sampling device.
Background
The gas collecting bag sampling is a commonly used sampling mode in gas sampling, and is commonly used for carrying out gas sampling analysis and sampling volume determination on waste gas generated in the production process of environment and energy enterprises. Or when an emergency occurs, the polluted gas in the local air is rapidly sampled and analyzed. For some gases with adsorption characteristics, in order to prevent adsorption, a polytetrafluoroethylene gas collecting bag is generally used, and a vacuum sampling method is adopted, so that sample gas to be detected directly enters the gas collecting bag to be prevented from being polluted and adsorbed by devices such as an air pump and the like. The working principle of sampling of the gas collection bag is as follows: and (3) placing the air collecting bag into a sealed vacuum box, exposing an air nozzle of the air collecting bag out of the vacuum box and connecting the air nozzle into a sampling pipe, pumping air in the vacuum box by using an air pump to form negative pressure, and starting to extract external gas to be detected by the air collecting bag due to the negative pressure.
Because most of the existing automatic sampling devices of the gas collecting bag are inflated by visual inspection, the gas collecting bag is filled by about 80 percent, and the volume of the sampled gas cannot be accurately controlled. For some tests needing quantitative sampling, the sampling volume is mainly calculated by manually extracting gas in a gas collection bag by using an injector and accumulating the gas one by one at present. This method requires manual reading and multiple accumulation, which results in excessive error. If the sampled gas has adsorption characteristics, the inner wall of the injector adsorbs too much sample gas, resulting in a lower measurement result.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the existing automatic sampling device for the air collecting bag cannot determine the sampling amount.
In order to solve the technical problems, the utility model provides the following technical scheme:
an automatic sampling device for a gas collection bag, comprising: the elastic cavity is provided with an opening, the upper end of the elastic cavity is provided with an opening, the opening is closed by an upper cover, and the upper cover is provided with a mounting hole; the gas collection cover plate is hermetically connected to the mounting hole of the upper cover; a gas collecting connecting pipe is arranged on the gas collecting cover plate in a penetrating mode, a first end of the gas collecting connecting pipe is connected with a gas collecting bag, a second end of the gas collecting connecting pipe is connected with a sampling pipe, and the gas collecting bag is located in the elastic cavity; the air pump is used for pumping the gas in the elastic cavity; and the detection assembly comprises a pressure sensor for detecting the internal pressure of the elastic cavity and a temperature sensor for detecting the internal temperature of the elastic cavity.
In some embodiments of the present invention, the flexible support assembly further comprises a flexible support assembly, and the flexible support assembly can be synchronously stretched with the elastic cavity and can realize the guiding support of the flexible support assembly.
In some embodiments of the present invention, at least one support sleeve is disposed on an outer wall of the elastic cavity, and the support sleeve is slidably sleeved on the telescopic support assembly.
In some embodiments of the present invention, the telescopic supporting assembly includes a first sleeve body and a second sleeve body which are telescopically connected, an upper end of the first sleeve body is connected to the upper cover, and a lower side of the first sleeve body is sleeved on the second sleeve body and can slide along a length direction of the second sleeve body.
In some embodiments of the present invention, the elastic cavity is a bellows, and the at least two groups of telescopic support assemblies are symmetrically arranged along the circumferential direction of the outer wall of the elastic cavity.
In some embodiments of the present invention, the upper cover has an air exhaust port, the air pump is mounted on the upper cover, and the pipeline between the air pump and the air exhaust port is provided with the detection assembly and the electromagnetic control valve.
In some embodiments of the present invention, a check valve is installed on the gas collecting cover plate, and the check valve is used for exhausting the gas in the elastic cavity to the outside.
In some embodiments of the present invention, the gas collecting cover plate is provided with a handle.
In some embodiments of the present invention, at least one locking structure is disposed between the first sleeve body and the second sleeve body, and the locking structure locks the first sleeve body at a set position of the second sleeve body.
In some embodiments of the present invention, the locking structure includes a positioning groove formed on the first sleeve, and a positioning bead and an elastic member mounted on the second sleeve, the positioning bead abuts against an inner wall of the first sleeve under the action of the elastic member, and when the positioning bead is matched with the positioning groove, the first sleeve and the second sleeve are locked.
Compared with the prior art, the technical scheme of the utility model has the following technical effects:
in the automatic sampling device for the gas collection bag, the vacuum pump is used for automatically vacuumizing the elastic cavity to reduce the internal gas pressure, the gas extraction is stopped when the pressure sensor detects that the internal gas pressure reaches a set value, the sampling pipe is connected into the gas collection connecting pipe, the gas to be collected is connected into the other end of the sampling pipe, and the gas to be collected enters the gas collection bag under the action of the internal and external pressure difference until the internal and external gas pressures are balanced. The total volume of the elastic cavity is unchanged in the processes of air exhaust and gas collection, and the gas collection volume in the gas collection bag can be calculated according to an ideal gas equation.
Drawings
The objects and advantages of the present invention will be understood by the following detailed description of the preferred embodiments of the utility model, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an automatic sampling device for a gas collection bag according to an embodiment of the utility model;
FIG. 2 is a schematic structural diagram of the automatic sampling apparatus for gas collection bags according to the present invention after evacuation by the suction pump;
fig. 3 is a schematic structural diagram of the gas collection end of the automatic sampling device of the gas collection bag of the utility model;
fig. 4 is a schematic structural diagram of a detection device and an air pump in the automatic sampling device for the air collection bag of the utility model.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the automatic sampling device for a gas collection bag provided by the present invention comprises: an elastic cavity 1 with an opening, a suction pump 2 for sucking gas in the elastic cavity 1; the upper end of the elastic cavity 1 is provided with an opening, the opening is closed by an upper cover 3, and the upper cover 3 is provided with a mounting hole 1 a; the gas collecting cover plate is hermetically connected to a mounting hole of the upper cover 3, a gas collecting connecting pipe 5 penetrates through the gas collecting cover plate 4, a first end of the gas collecting connecting pipe 5 is connected with a gas collecting bag 6, a second end of the gas collecting connecting pipe 5 is connected with a sampling pipe, and the gas collecting bag 6 is positioned in the elastic cavity 1; and a detection assembly comprising a pressure sensor 7 for detecting the pressure inside the elastic cavity 1 and a temperature sensor 17 for detecting the temperature inside the elastic cavity 1.
When the automatic sampling device for the air collecting bag 6 is used for collecting gas, firstly, the elastic cavity 1 is fixed at a certain set position, the air suction pump 2 is controlled to suck the gas in the elastic cavity 1, so that the internal air pressure is reduced, when the pressure sensor 7 detects that the internal gas pressure reaches a set value, the air suction is stopped, the sampling pipe is connected into the gas collection connecting pipe 5, the other end of the sampling pipe is connected into the gas to be collected, and under the action of the internal and external pressure difference, the gas to be collected enters the air collecting bag 6 until the internal and external air pressures are balanced.
Because the elastic cavity 1 and the upper cover 3 are matched to form a sealed cavity, the air quantity in the elastic cavity 1 is constant, and the volume of the air in the elastic cavity 1 is reduced and the pressure is increased under the air collection action of the air collection bag 6.
According to an ideal gas state equation:
wherein, P0The air pressure in the elastic cavity 1 after the air pump 2 vacuumizes is measured; v0The volume of the elastic cavity 1 after the air pump 2 vacuumizes is obtained; t is0The temperature in the elastic cavity 1 after the air pump 2 vacuumizes is measured; p1The air pressure of the gas in the elastic cavity 1 after the gas collection of the gas collection bag 6 is finished; v1The volume of the gas in the elastic cavity 1 after the gas collection of the gas collection bag 6 is finished; t is1The temperature of the gas in the elastic cavity 1 after the gas collection of the gas collection bag 6 is finished;
due to P0 、P1 、T0 、T1Obtainable from pressure sensor 7 and temperature sensor 17, V0The volume of the elastic cavity 1 at the first position can be directly obtained or obtained by calculating the bottom area and the height of the elastic cavity 1; thus, the volume V of the gas in the elastic chamber 1 at which the gas collection by the gas collection bag 6 is finished1The gas collection volume V of the gas collection bag 6 can be calculated according to the ideal gas state equation2= V0 -V1. The automatic gas collecting device can accurately obtain the gas collecting volume of the gas collecting bag 6.
In an alternative embodiment, the elastic cavity 1 is made of rubber material, and is formed into a bellows shape. In order to improve the telescopic reliability of the elastic cavity 1, the automatic gas collecting device further comprises a telescopic supporting component which can be synchronously telescopic with the elastic cavity 1 and realize the guiding support of the elastic cavity 1. Specifically, the outer wall of the elastic cavity 1 is provided with at least one support sleeve 11, and the support sleeve 11 is slidably sleeved on the telescopic support assembly. The telescopic supporting component is made of rigid materials, and guides and supports the elastic cavity 1, so that the consistency of the elastic cavity 1 and the telescopic direction of the telescopic supporting component is better.
As shown in fig. 2 and 3, the telescopic supporting assembly includes a first sleeve 8 and a second sleeve 9 that are telescopically connected, an upper end of the first sleeve 8 is connected to the upper cover 3, and a lower side of the first sleeve 8 is sleeved on the second sleeve 9 and can slide along a length direction of the second sleeve 9. The lower side of the second sleeve 9 is fixed on the bottom plate or the ground.
Specifically, the telescopic supporting components are at least provided in two groups and are circumferentially and symmetrically arranged along the outer wall of the elastic cavity 1.
In an optional embodiment, the upper cover 3 has an air exhaust port 2a, the air pump 2 is mounted on the upper cover 3, and the pipeline between the air pump 2 and the air exhaust port 2a is provided with the detection assembly and the electromagnetic control valve 16. The air pump 2 and the detection component are integrally arranged on the upper cover 3, so that the gas collecting device is more portable.
More specifically, the gas collection cover plate 4 is provided with a handle 10, and after the collection of the gas collection bag 6 is finished, the handle 10 is pulled to take out the gas collection bag 6.
Specifically, a check valve 12 is installed on the gas collection cover plate 4, and the check valve 12 is used for discharging the gas in the elastic cavity 1 to the outside.
In order to keep the elastic cavity 1 at the same position all the time, at least one locking structure is arranged between the first sleeve body 8 and the second sleeve body 9, and the locking structure locks the first sleeve body 8 at a set position of the second sleeve body 9. Specifically, the locking structure includes a positioning groove 15 formed on the first sleeve 8, and a positioning bead 13 and an elastic member 14 mounted on the second sleeve 9, the positioning bead 13 abuts against the inner wall of the first sleeve 8 under the action of the elastic member 14, and when the positioning bead 13 is matched with the positioning groove 15, the first sleeve 8 and the second sleeve 9 are locked.
More specifically, the positioning bead 13 and the elastic member 14 are disposed in a mounting sleeve extending along the horizontal direction, the elastic member 14 is a compression spring, one end of the elastic member abuts against the inner wall of the second sleeve 9, the other end of the elastic member abuts against the positioning bead 13, the positioning bead 13 always abuts against the inner wall of the first sleeve 8, and when the first sleeve 8 moves upward to the second setting position under the action of air pressure, the positioning bead 13 cooperates with the positioning groove 15 on the first sleeve 8 to prevent the first sleeve 8 from moving upward. When the first sleeve body 8 is continuously acted by an upward external force, the positioning bead 13 is separated from the matching with the positioning groove 15, so that the first sleeve body 8 is continuously moved upward.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the utility model.
Claims (10)
1. The utility model provides a gas collection bag automatic sampling device which characterized in that includes:
the elastic cavity is provided with an opening, the upper end of the elastic cavity is provided with an opening, the opening is closed by an upper cover, and the upper cover is provided with a mounting hole;
the gas collection cover plate is hermetically connected to the mounting hole of the upper cover; a gas collecting connecting pipe is arranged on the gas collecting cover plate in a penetrating mode, a first end of the gas collecting connecting pipe is connected with a gas collecting bag, a second end of the gas collecting connecting pipe is connected with a sampling pipe, and the gas collecting bag is located in the elastic cavity;
the air pump is used for pumping the gas in the elastic cavity;
and the detection assembly comprises a pressure sensor for detecting the internal pressure of the elastic cavity and a temperature sensor for detecting the internal temperature of the elastic cavity.
2. The automatic sampling device for the gas collection bag according to claim 1, further comprising a telescopic support component which is synchronously telescopic with the elastic cavity and realizes guiding support thereof.
3. The automatic sampling device for the gas collection bag according to claim 2, wherein the outer wall of the elastic cavity is provided with at least one support sleeve, and the support sleeve is slidably sleeved on the telescopic support component.
4. The automatic sampling device for the gas collection bag according to claim 2, wherein the telescopic support assembly comprises a first sleeve body and a second sleeve body which are telescopically connected, the upper end of the first sleeve body is connected to the upper cover, and the lower side of the first sleeve body is sleeved on the second sleeve body and can slide along the length direction of the second sleeve body.
5. The automatic sampling device of the gas collecting bag according to claim 2, wherein the elastic cavity is a corrugated tube, and at least two groups of the telescopic support assemblies are arranged and are symmetrically arranged along the circumferential direction of the outer wall of the elastic cavity.
6. The automatic sampling device for the gas collection bag according to claim 1, wherein the upper cover is provided with an air exhaust port, the air pump is mounted on the upper cover, and the detection assembly and the electromagnetic control valve are arranged on a pipeline between the air pump and the air exhaust port.
7. The automatic sampling device for the gas collection bag according to claim 1, wherein a one-way valve is mounted on the gas collection cover plate and used for exhausting the gas in the elastic cavity to the outside.
8. The automatic sampling device for the gas collection bag according to claim 1, wherein the gas collection cover plate is provided with a handle.
9. The automatic sampling device for the gas collecting bag according to claim 4, wherein at least one locking structure is provided between the first sleeve body and the second sleeve body, and the locking structure locks the first sleeve body at a set position of the second sleeve body.
10. The automatic sampling device for the gas collecting bag according to claim 9, wherein the locking structure comprises a positioning groove formed on the first sleeve, and a positioning bead and an elastic member mounted on the second sleeve, the positioning bead abuts against the inner wall of the first sleeve under the action of the elastic member, and when the positioning bead is matched with the positioning groove, the first sleeve and the second sleeve are locked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220624760.XU CN217006567U (en) | 2022-03-22 | 2022-03-22 | Automatic sampling device of gas collection bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220624760.XU CN217006567U (en) | 2022-03-22 | 2022-03-22 | Automatic sampling device of gas collection bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217006567U true CN217006567U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220624760.XU Active CN217006567U (en) | 2022-03-22 | 2022-03-22 | Automatic sampling device of gas collection bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217006567U (en) |
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- 2022-03-22 CN CN202220624760.XU patent/CN217006567U/en active Active
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