A gas sampling device for environmental detection

Abstract

The present invention belongs to the field of gas collection technology, and discloses a gas sampling device for environmental detection, including a main body and a fixed block, wherein an air inlet and a sealing groove are provided in the middle of the main body, a limiting ring 1 is movably sleeved on the outer surface of the main body, and a plurality of placement cavities are provided at the bottom of the main body, wherein a sampling tank is inserted in the placement cavity. The device uses the "piston movement" generated by piston 1 in the inner cavity of the sealing groove and piston 2 in the inner cavity of the placement cavity to completely discharge the air that may cause interference, and delivers the environmental gas into the inner cavity of the sampling tank through the overlap and connection of the venting groove and the connecting port, and then forms a one-way valve by using the design that the sealing column is adapted to be inserted into the top opening of the sampling tank, and uses the sealing block and the rubber block to be pushed downward by air pressure and discharge the air in the inner cavity of the sampling tank, so that when the sealing block and the rubber block move to the bottom, the final exhaust operation is completed, thereby making the environmental gas entering the inner cavity of the sampling tank free of air interference.

Description

Technical Field

[0001] The invention belongs to the technical field of gas collection, and in particular relates to a gas sampling device for environmental detection. Background Art

[0002] In order to study environmental changes, the prior art mainly collects some gases in the corresponding environmental area and analyzes and studies the chemical composition of the gases, so as to facilitate the judgment of environmental changes. Before detecting environmental gases, a sampling device is used to collect environmental gases. However, the gas sampling devices in the prior art have the following defects: most of the air will remain in the space used for storage and communication with the outside world, and the air will enter the sampling tank together with the sampled gas, resulting in impure composition of the sampled gas, which reduces the final detection accuracy. In the prior art, a vacuum pump is generally used to extract the air therein, but this undoubtedly increases the cost and requires the device to be evacuated after each sampling, which is inconvenient to transfer and has high cost of use. Summary of the invention

[0003] The object of the present invention is to provide a gas sampling device for environmental detection to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: A gas sampling device for environmental detection, comprising a main body and a fixed block, an air inlet and a sealing groove are provided in the middle of the main body, a limiting ring 1 is movably sleeved on the outer surface of the main body, a plurality of placement cavities are provided at the bottom of the main body, a sampling tank is inserted into the interior of the placement cavity, a guide column is installed on the inner cavity of the sampling tank, a sealing column, a sealing block and a rubber block are provided in the outer surface of the guide column in sequence from top to bottom, a limiting ring 2 is installed on the inner wall of the placement cavity, a piston 2 is provided on the inner wall sealing sleeve of the placement cavity, a spring is elastically connected between the piston 2 and the fixed block, a groove and a connecting port communicating with the placement cavity are provided on the inner wall of the sealing groove, a connecting block is fixedly connected to the outer surface of the piston 2, a sealing ring is fixedly connected to the bottom of the connecting block, a piston 1 is provided on the bottom sealing sleeve of the inner wall of the sealing groove, a ventilation groove is provided inside the piston 1, and a plurality of adaptation grooves are provided on the top of the piston 1.

[0005] As a preferred solution of the present invention, the inner ring surface of the limit ring 1 is fixedly connected with multiple groups of blocks, and respectively correspond to multiple groups of sampling tanks, the blocks abut against the bottom of the sampling tanks, a balancing hole is provided at the bottom of the sampling tanks, and a circular ring protrusion is provided at the bottom of the outer surface of the main body, which prevents the limit ring 1 from moving downward.

[0006] As a preferred solution of the present invention, the cross-sectional shape of the sealing column is "T"-shaped and is interference-fitted into the top opening of the sampling tank. The diameter of the lower end of the sealing column is smaller than the inner diameter of the sampling tank.

[0007] As a preferred solution of the present invention, the sealing block abuts against the surface of the sealing column and semi-surrounds the outer surface of the sealing column from bottom to top, and the sealing block and the rubber block are interference fit with the inner wall of the sampling tank.

[0008] As a preferred solution of the present invention, the bottom sealing sleeve of the second piston is arranged on the top of the sampling tank and abuts against the second limiting ring, the upper part of the sampling tank abuts against the second limiting ring, and the second piston seals against the connecting port.

[0009] As a preferred solution of the present invention, the connecting block is adapted to be snap-fitted into the through groove, the through groove is located above the communicating port, and the fixing block is fixedly mounted on the top of the inner wall of the placement cavity.

[0010] As a preferred solution of the present invention, the sealing ring is formed by connecting multiple groups of round blocks and connecting rings, and all of them are sealingly abutted against the inner wall of the sealing groove. The number of the adapting grooves corresponds to the round blocks, and they are sealingly adapted to each other.

[0011] As a preferred solution of the present invention, the ventilation groove is connected to the air inlet and corresponds to multiple groups of connecting ports. When the piston moves upward to the highest point, the ventilation groove coincides with the connecting ports.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The device utilizes the "piston movement" generated by the piston 1 in the inner cavity of the sealing groove and the piston 2 in the inner cavity of the placement chamber to completely discharge the air that may cause interference. The piston 1 sealing sleeve is provided on the inner wall of the sealing groove, and the external environmental gas sucked in by the air inlet is filled in the "exhaust space" below the piston 1, forming a positive pressure that pushes the piston 1 upward, and the piston 1 is sealed and adapted with the sealing ring through the adapting groove opened on the top of the piston 1, and the sealing ring, the connecting block and the piston 2 are simultaneously pushed upward. The piston 2 moves upward, so that the sealed space formed between the piston 1 and the limit ring 2 is not mixed with air, and a strong negative pressure is formed, which is offset by the upward thrust of the piston 1. Finally, the ventilation groove overlaps and connects with the connecting port, and the environmental gas is sent into the inner cavity of the sampling tank. Then, the sealing column is adapted to be inserted into the top opening of the sampling tank to form a one-way valve. The sealing block and the rubber block are pushed downward by the air pressure to discharge the air in the inner cavity of the sampling tank, so that when the sealing block and the rubber block move to the bottom, the final exhaust operation is completed, and the environmental gas entering the inner cavity of the sampling tank is free of air interference.

[0014] 2. At the same time, the device can install multiple groups of sampling cans through multiple groups of placement cavities, so as to realize the synchronous sampling of multiple groups of environmental gases. The thrust generated by the abutment between piston 1 and the sealing ring is used to push the connecting block and piston 2 upward, and compress the spring to generate downward resistance. During the period before piston 1 moves to the point where the vent groove coincides with the connecting port, the spring generates a continuously increasing downward resistance, so that more and more environmental gases enter the "exhaust space" and the concentration thereof becomes higher and higher. In this way, the concentration of environmental gases entering different sampling cans through different connecting ports becomes higher and higher, thereby making the detection work after sampling more accurate.

[0015] 3. Finally, the sealing block and the rubber block are used to move downward along the axis of the guide column to the lowest point under the action of the positive pressure of the ambient gas. The balance hole is sealed by pressing the rubber block. The greater the air pressure in the inner cavity of the sampling tank, the better the sealing effect. The "T"-shaped sealing column is then sealed and stuck into the top opening of the sampling tank to prevent the ambient gas entering the inner cavity of the sampling tank from escaping. The top of the sealing column and the seal at the opening of the sampling tank are used to cooperate with each other when air is taken in, so as to enter the inner cavity of the sampling tank downward, and the gas enters the sampling tank along the gap between the sealing column and the sampling tank. After the air supply is stopped, the positive pressure in the inner cavity of the sampling tank is used to automatically push the sealing column upward to reset, and clamp the opening of the sampling tank to form a seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a bottom schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a top schematic diagram of the structure of the present invention;

[0018] Figure 3 It is a front cutaway schematic diagram of the structure of the present invention;

[0019] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at A in the middle;

[0020] Figure 5 It is a side partial cutaway schematic diagram of the structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the separation of the sampling tank, the fixing block, the first piston, the second limiting ring, the second piston, the spring, the connecting block and the sealing ring of the present invention;

[0022] Figure 7 It is a schematic diagram of the separation of the sampling tank, the fixing block, the sealing column, the sealing block, the rubber block, the second limiting ring, the second piston, the spring, the connecting block and the sealing ring of the present invention;

[0023] Figure 8 It is a top view cutaway schematic diagram of the structure of the present invention;

[0024] Fig. 9 It is a top view schematically cut away diagram of a piston 1 of the present invention.

[0025] In the figure: 1. main body; 2. limit ring 1; 3. clamping block; 4. air inlet; 41. sealing groove; 5. placement cavity; 6. sampling tank; 7. balance hole; 8. fixing block; 9. through groove; 10. piston 1; 11. ventilation groove; 12. guide column; 13. sealing column; 14. sealing block; 15. rubber block; 16. limit ring 2; 17. piston 2; 18. spring; 19. connecting block; 20. sealing ring; 21. connecting port; 22. adapter groove. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 9 As shown, the embodiment of the present invention provides a gas sampling device for environmental detection, including a main body 1 and a fixing block 8, an air inlet 4 and a sealing groove 41 are provided in the middle of the main body 1, a limiting ring 2 is movably sleeved on the outer surface of the main body 1, a plurality of placement cavities 5 are provided at the bottom of the main body 1, a sampling tank 6 is inserted into the placement cavity 5, a guide column 12 is installed in the inner cavity of the sampling tank 6, a sealing column 13, a sealing block 14 and a rubber block 15 are provided on the outer surface of the guide column 12 in sequence from top to bottom, and a limiting ring 2 is installed on the inner wall of the placement cavity 5. The second positioning ring 16 is provided, the inner wall sealing sleeve of the placement chamber 5 is provided with a second piston 17, a spring 18 is elastically connected between the second piston 17 and the fixed block 8, the inner wall of the sealing groove 41 is provided with a groove 9 and a connecting port 21 connected to the placement chamber 5, the outer surface of the second piston 17 is fixedly connected with a connecting block 19, the bottom of the connecting block 19 is fixedly connected with a sealing ring 20, the bottom sealing sleeve of the inner wall of the sealing groove 41 is provided with a piston 10, the interior of the piston 10 is provided with a venting groove 11, and the top of the piston 10 is provided with multiple sets of adapting grooves 22;

[0028] The device utilizes the "piston movement" generated by the piston 10 in the inner cavity of the sealing groove 41 and the piston 2 17 in the inner cavity of the placement chamber 5 to exhaust all the air that may cause interference. The piston 10 sealing sleeve is arranged on the inner wall of the sealing groove 41, and the external environment gas sucked by the air inlet 4 is filled in the "exhaust space" below the piston 10, forming a positive pressure to push the piston 10 upward, and the adapter groove 22 opened on the top of the piston 10 is sealed and adapted with the sealing ring 20, and the sealing ring 20, the connecting block 19 and the piston 2 17 are simultaneously pushed upward, and the piston 2 17 moves upward to make it fit with the limit ring. The sealed space formed between the two 16 will not mix with air and form a strong negative pressure, which is offset by the upward thrust of the piston 10. Finally, the ventilation groove 11 overlaps and connects with the connecting port 21 to send the ambient gas into the inner cavity of the sampling tank 6, and then the sealing column 13 is adapted to be snapped into the design of the top opening of the sampling tank 6 to form a one-way valve. The sealing block 14 and the rubber block 15 are pushed downward by the air pressure to discharge the air in the inner cavity of the sampling tank 6, so that when the sealing block 14 and the rubber block 15 move to the bottom, the final exhaust operation is completed, so that the ambient gas entering the inner cavity of the sampling tank 6 is not disturbed by air.

[0029] At the same time, the device can install multiple groups of sampling tanks 6 through multiple groups of placement cavities 5, so as to realize synchronous sampling of multiple groups of environmental gases. The thrust generated by the abutment between the piston 10 and the sealing ring 20 is used to push the connecting block 19 and the piston 2 17 upward, and compress the spring 18 to generate downward resistance. During the period before the piston 10 moves to the time when the ventilation groove 11 coincides with the connecting port 21, the spring 18 generates a continuously increasing downward resistance, so that more and more environmental gases enter the "exhaust space" and the concentration thereof becomes higher and higher. In this way, the concentration of environmental gases entering different sampling tanks 6 through different connecting ports 21 becomes higher and higher, thereby making the detection work after sampling more accurate.

[0030] Finally, the sealing block 14 and the rubber block 15 are moved downward to the lowest point along the axis of the guide column 12 under the action of the positive pressure of the ambient gas, and the balance hole 7 is sealed by pressing the rubber block 15. The greater the air pressure in the inner cavity of the sampling tank 6, the better the sealing effect. The "T"-shaped sealing column 13 is then sealed and stuck into the top opening of the sampling tank 6 to prevent the ambient gas entering the inner cavity of the sampling tank 6 from escaping. The top of the sealing column 13 and the sealing cooperation at the opening of the sampling tank 6 are used to enter the inner cavity of the sampling tank 6 downward during air intake, and the gas enters the sampling tank 6 along the gap between the sealing column 13 and the sampling tank 6. After the air supply is stopped, the positive pressure in the inner cavity of the sampling tank 6 is used to automatically push the sealing column 13 upward to reset, and clamp the opening of the sampling tank 6 to form a seal.

[0031] Among them, the inner ring surface of the limit ring 1 2 is fixedly connected with multiple groups of clamping blocks 3, which correspond to multiple groups of sampling tanks 6 respectively. The clamping blocks 3 abut against the bottom of the sampling tank 6. The bottom of the sampling tank 6 is provided with a balancing hole 7. The bottom of the outer surface of the main body 1 is provided with a circular ring protrusion, which prevents the limit ring 1 2 from moving downward;

[0032] The block 3 cooperates with the limiting ring 2 to abut against the sampling tank 6 upwards to prevent the sampling tank 6 from running out when sampling. The sampling tank 6 can be taken out by simply rotating the limiting ring 2 and driving the block 3 to move to a position completely offset from the sampling tank 6.

[0033] The cross-sectional shape of the sealing column 13 is "T"-shaped, and is interference-fitted into the top opening of the sampling tank 6, and the diameter of the lower end of the sealing column 13 is smaller than the inner diameter of the sampling tank 6;

[0034] The "T"-shaped sealing column 13 is sealed and snapped into the top opening of the sampling tank 6, which can effectively prevent the ambient gas entering the inner cavity of the sampling tank 6 from escaping. Because under the positive pressure of the gas in the inner cavity of the sampling tank 6, the sealing column 13 is automatically pushed upward to the opening of the sampling tank 6 to form a seal.

[0035] The sealing block 14 abuts against the surface of the sealing column 13 and semi-encloses the outer surface of the sealing column 13 from bottom to top. The sealing block 14 and the rubber block 15 are in interference fit with the inner wall of the sampling tank 6.

[0036] The sealing column 13 can seal the upper opening of the sampling tank 6 upwards, while the sealing block 14 and the rubber block 15 move downwards under the positive pressure of the gas entering the inner cavity of the sampling tank 6, and gradually expand the equivalent space of the inner cavity of the sampling tank 6 for storing gas.

[0037] The bottom sealing sleeve of the second piston 17 is arranged on the top of the sampling tank 6 and abuts against the second limiting ring 16. The upper part of the sampling tank 6 abuts against the second limiting ring 16. The second piston 17 abuts against the communication port 21 in a sealed manner.

[0038] The piston 17 is downwardly sealed above the sampling tank 6 to leave no gap and avoid the influence of residual air on the detection accuracy of environmental gas sampling. When the piston 17 moves upward, the connecting port 21 is still blocked by the sealing ring 20 and the solid part of the piston 10, and no air can enter. Therefore, the driving force of the piston 10 is needed to overcome its own negative pressure resistance.

[0039] The connection block 19 is adapted to be snap-fitted into the slot 9, the slot 9 is located above the communication port 21, and the fixing block 8 is fixedly installed on the top of the inner wall of the placement cavity 5;

[0040] The connecting block 19 drives the second piston 17 and the sealing ring 20 to move, and moves up and down along the inner wall of the groove 9 to provide a connecting function.

[0041] The sealing ring 20 is formed by connecting a plurality of groups of round blocks and connecting rings, and all of them are sealed against the inner wall of the sealing groove 41. The number of the adapting grooves 22 corresponds to the number of the round blocks, and they are sealed and adapted to each other.

[0042] The round block part of the sealing ring 20 is just inserted into the adapting groove 22. When the piston 10 pushes the sealing ring 20 upward, the two can form a sealed and connected whole.

[0043] The ventilation groove 11 is connected with the air inlet 4 and corresponds to the plurality of communication ports 21. When the piston 10 moves upward to the highest point, the ventilation groove 11 overlaps with the communication ports 21.

[0044] The side opening of the vent groove 11 is blocked by the inner wall of the sealing groove 41 , so it is in a sealed and airtight state before being connected with the communication port 21 .

[0045] Working principle:

[0046] When the device is working, the bottom opening of the air inlet 4 is connected to an external exhaust device (including but not limited to a fan, an exhaust pump, etc.), and ambient gas is introduced into the sealing groove 41. At this time, the "exhaust space" in the inner cavity of the sealing groove 41 below the piston 10 generates positive pressure, and gradually pushes the piston 10 to move upward, and the "exhaust space" increases accordingly and is filled with more and more ambient gas. At this time, the air in the inner cavity of the sealing groove 41 is gradually discharged upward as the "exhaust space" expands;

[0047] Then, after the piston 10 moves upward to a position close to the sealing ring 20, the sealing ring 20 will be adapted and abutted against the adapting groove 22 to form a seal. Under the action of air pressure, the sealing ring 20, the connecting block 19 and the piston 2 17 are pushed upward at the same time. The piston 2 17 moves upward and evacuates the sealed space between the piston 2 17 and the limiting ring 2 16 in the inner cavity of the placement chamber 5, and at the same time compresses the spring 18. There is no air in the increasingly larger space between the piston 2 17 and the limiting ring 2 16. When the sealing ring 20 moves upward At the same time, the piston 10 begins to face the communication port 21, and communicates with the communication port 21 when the vent groove 11 coincides with the communication port 21, the inner cavity of the placement chamber 5, the sealed space between the piston 2 17 and the limiting ring 2 16 and the "exhaust space" in the sealing groove 41. At this time, the ambient gas in the "exhaust space" enters the interior of the sampling tank 6 along the communication port 21 and the placement chamber 5 under the action of positive pressure, and pushes the sealing column 13, the sealing block 14 and the rubber block 15 downward, pushing the air in the inner cavity of the sampling tank 6 to be discharged along the balance hole 7;

[0048] Then, inside the sampling tank 6, the sealing column 13, the sealing block 14 and the rubber block 15 move downward. After the top end of the sealing column 13 leaves the top opening of the sampling tank 6, a gap is formed between its outer surface and the inner wall of the sampling tank 6, and the ambient gas can enter the inner cavity of the sampling tank 6 through the gap. As the ambient gas in the inner cavity of the sampling tank 6 gradually increases, the sealing block 14 and the rubber block 15 finally move to the bottom of the inner wall of the sampling tank 6, and make the rubber block 15 abut against it to seal. After the gas supply is stopped, the piston 2 17, the connecting block 19 and the sealing ring 20 that lose the positive pressure push are quickly reset under the action of the rebound force of the spring 18, and the connecting port 21 is blocked by the sealing ring 20. At this time, the opening at the top of the sampling tank 6 is blocked by the reset piston 2 17, and the sampling tank 6 completes the sampling of the ambient gas.

[0049] Finally, it is only necessary to rotate the limit ring 2 and drive the clamping block 3 to rotate to a position offset from the sampling tank 6. At this time, the sampling tank 6 filled with gas can be pulled out from the placement cavity 5, and the positive pressure gas in the inner cavity of the sampling tank 6 can push the sealing column 13 and re-insert it into the top opening of the sampling tank 6 for automatic sealing.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas sampling device for environmental detection, comprising a main body (1) and a fixed block (8), wherein a gas inlet (4) and a sealing groove (41) are provided in the middle of the main body (1), and a limiting ring (2) is movably sleeved on the outer surface of the main body (1), characterized in that: The bottom of the main body (1) is provided with a plurality of placement cavities (5), the interior of the placement cavities (5) is plugged with sampling cans (6), the inner cavity of the sampling cans (6) is provided with guide columns (12), the outer surface of the guide columns (12) is provided with sealing sleeves provided with sealing columns (13), sealing blocks (14) and rubber blocks (15) in order from top to bottom, the inner wall of the placement cavity (5) is provided with a second limit ring (16), the inner wall sealing sleeve of the placement cavity (5) is provided with a second piston (17), a spring (18) is elastically connected between the second piston (17) and the fixed block (8), the inner wall of the sealing groove (41) is provided with a through groove (9) and a connecting port (21) which are connected to the placement cavity (5), the outer surface of the second piston (17) is fixedly connected to the fixed block (8), and the sealing sleeve of the second piston (17) is provided with a connecting port (21) which is connected to the placement cavity (5). A connecting block (19) is connected, and a sealing ring (20) is fixedly connected to the bottom of the connecting block (19). A piston (10) is provided at the bottom sealing sleeve of the inner wall of the sealing groove (41). A venting groove (11) is provided inside the piston (10). A plurality of groups of adapting grooves (22) are provided on the top of the piston (10). The cross-sectional shape of the sealing column (13) is "T"-shaped, and is interference-fitted into the top opening of the sampling tank (6). The diameter of the lower end of the sealing column (13) is smaller than the inner diameter of the sampling tank (6). The sealing ring (20) is formed by connecting a plurality of groups of round blocks and connecting rings, and all of them are in sealing contact with the inner wall of the sealing groove (41). The number of the adapting grooves (22) corresponds to the number of the round blocks, and they are sealingly fitted to each other.

2. A gas sampling device for environmental detection according to claim 1, characterized in that: The inner ring surface of the limiting ring 1 (2) is fixedly connected to a plurality of groups of clamping blocks (3) which respectively correspond to the plurality of groups of sampling tanks (6); the clamping blocks (3) abut against the bottom of the sampling tank (6); a balancing hole (7) is provided at the bottom of the sampling tank (6); and a circular protrusion is provided at the bottom of the outer surface of the main body (1); the circular protrusion prevents the limiting ring 1 (2) from moving downward.

3. A gas sampling device for environmental detection according to claim 2, characterized in that: The sealing block (14) abuts against the surface of the sealing column (13) and is arranged to semi-enclose the outer surface of the sealing column (13) from bottom to top. The sealing block (14) and the rubber block (15) are in interference fit with the inner wall of the sampling tank (6).

4. A gas sampling device for environmental detection according to claim 3, characterized in that: The bottom sealing sleeve of the second piston (17) is arranged on the top of the sampling tank (6) and abuts against the second limiting ring (16); the upper part of the sampling tank (6) abuts against the second limiting ring (16); and the second piston (17) is sealingly abutted against the connecting port (21).

5. A gas sampling device for environmental detection according to claim 4, characterized in that: The connecting block (19) is adapted to be snap-fitted into the through groove (9), the through groove (9) is located above the connecting opening (21), and the fixing block (8) is fixedly mounted on the top of the inner wall of the placement cavity (5).

6. A gas sampling device for environmental detection according to claim 5, characterized in that: The ventilation groove (11) is connected to the air inlet (4) and corresponds to a plurality of groups of communication ports (21); when the piston 1 (10) moves upward to the highest point, the ventilation groove (11) overlaps with the communication ports (21).

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