Pipe orifice plugging device and gas concentration detection equipment

Abstract

The utility model relates to the field of gas detection equipment, in particular to a pipe orifice plugging device and gas concentration detection equipment, the pipe orifice plugging device comprises an outer shell, the outer shell is provided with a connecting structure used for being detachably connected to a pipe orifice, and the upper edge of the outer shell is movably provided with a plugging piece in the direction right opposite to the pipe orifice; the outer shell is further provided with a locking structure used for keeping the plugging piece at the position where the pipe opening is plugged. The plugging piece can move to the pipe opening position in the outer shell, and the locking structure fixes the position of the plugging piece. The gas concentration detection device is simple in structure, the pipe opening is blocked through the blocking piece, external impurities can be effectively prevented from entering the detection device from the pipe opening through the gas inlet pipeline, and therefore the accuracy of a gas concentration detection result is guaranteed; the pipe orifice plugging device is convenient to disassemble, assemble, clean and replace, and the working efficiency of gas concentration detection is improved.

Description

Technical Field

[0001] The utility model relates to the field of gas detection equipment, in particular to a pipe opening blocking device and gas concentration detection equipment. Background Art

[0002] Natural gas is the cleanest fossil fuel on earth. As the main energy supply, natural gas can reduce the use of coal and oil, thereby improving environmental pollution problems. A natural gas pipeline refers to a pipeline that transports natural gas from the mining site or processing plant to the urban gas distribution center or industrial enterprise users, also known as a gas transmission pipeline. Using natural gas pipelines to transport natural gas is a way to transport a large amount of natural gas on land, and it places extremely high demands on the airtightness of the pipeline. Once the airtightness is not good and leakage occurs, the natural gas will come into contact with various external variable factors, which will trigger various large-scale malicious incidents and cause irreversible consequences. Therefore, regular leak detection is required, and natural gas concentration detection is a common method for detecting gas leaks.

[0003] A Chinese patent with authorization announcement number CN217688851U discloses a natural gas concentration detection device with adjustable measurement sensitivity, including a natural gas concentration detection body, a front adjustment member is arranged at the front, ventilation slots are arranged in an array at intervals on the outer side of the front adjustment member, and an inner adjustment cylinder is rotatably mounted on the inner side of the front adjustment member; by rotating the front adjustment member until it is offset from the ventilation slots of the inner adjustment cylinder, the front rotor rotates and expands to seal the front end of the front adjustment member, thereby sealing the detection module of the natural gas concentration detection body inside to provide a protective seal from the outside.

[0004] However, in the above technical solution, there is a certain gap between adjacent front rotor blades after the front rotor blades rotate and expand, and the sealing and isolation of the front end of the front adjustment part cannot be guaranteed. Dust and other impurities can easily enter the natural gas concentration detection module through the gaps between adjacent front rotor blades, causing dust accumulation in the detection pipeline, thereby reducing the accuracy of the detection results. Summary of the invention

[0005] The purpose of the utility model is to provide a pipe port plugging device to solve the problem that the detection equipment in the prior art cannot effectively isolate external impurities, thereby affecting the detection accuracy and failing to make an accurate judgment on the gas leakage. The purpose of the utility model is also to provide a gas concentration detection device using the pipe port plugging device.

[0006] To achieve the above-mentioned purpose, the technical solution of the pipe orifice sealing device provided by the utility model is: a pipe orifice sealing device, including an outer shell, the outer shell having a connecting structure for detachably connecting to the pipe orifice, a sealing piece movably installed on the outer shell in a direction opposite to the pipe orifice, and a locking structure for keeping the sealing piece in a position to seal the pipe orifice is provided on the outer shell.

[0007] The beneficial effect is that the improvement of the pipe orifice plugging device provided by the utility model is that after the device is connected to the pipe orifice through the connecting structure, a plugging piece is movably installed on the outer shell in the direction facing the pipe orifice, and the plugging piece moves toward the pipe orifice to press the pipe orifice, and the position of the plugging piece is fixed by the locking structure to complete the plugging of the pipe orifice, thereby achieving a sealed state in which there is no gap between the plugging piece and the pipe orifice. It can effectively prevent foreign impurities from entering the interior of the detection equipment through the pipe orifice through the air intake pipe, thereby reducing the accuracy of the gas concentration detection result and preventing losses caused by making wrong judgments; at the same time, it ensures the cleanliness of the interior of the detection equipment, extending the service life and safe and stable operation cycle of the detection equipment.

[0008] As a further improvement, a slide groove extending along the direction of the pipe opening is provided on the outer shell, and a limiting block is connected to the blocking member, and the limiting block is slidably installed with the guide of the slide groove.

[0009] The beneficial effect is that the slide groove provides a movable channel coaxial with the extension direction of the pipe opening for the limit block, so that the movement of the blocking piece toward / away from the pipe opening is smooth and reliable.

[0010] As a further improvement, the locking structure is a U-shaped groove in the same direction as the pipe mouth, the groove section corresponding to the parallel edge of the U-shaped groove is connected to the lower part of the slide groove, or the locking structure is an L-shaped groove with a vertical edge connected to the slide groove.

[0011] The beneficial effect is that the locking structure can fix the position of the blocking piece, so that the blocking piece is fixed at the position of blocking the pipe opening, so that the blocking piece can achieve sealing protection for the pipe opening.

[0012] As a further improvement, the edge of the limit block has a force-applying section that passes through the outer wall of the housing and exposes a slide groove for the operator to slide.

[0013] The beneficial effect is that the position of the blocking member can be adjusted quickly and directly by controlling the force application section of the limit block.

[0014] As a further improvement, the limiting block is detachably connected to the blocking member.

[0015] The beneficial effect is that the blocking piece can be taken out from the outer shell by disassembling the limit block, which is convenient for cleaning and replacement of the blocking piece.

[0016] As a further improvement, an elastic component for keeping the blocking member away from the pipe opening is provided between the blocking member and the outer shell.

[0017] The beneficial effect is that when the limit block is adjusted to the slide groove, the locking structure no longer has a fixing effect on the blocking piece. At this time, the elastic component pops up in the direction away from the pipe mouth, and the blocking piece is simultaneously moved away from the pipe mouth by the elastic component. The air inlet channel is opened, preparing for the next step of gas concentration detection.

[0018] As a further improvement, a flexible sealing structure is provided on the blocking member at a position corresponding to the direction of the pipe opening.

[0019] The beneficial effect is: due to the buffering of the flexible sealing structure, the sealing piece will not cause wear to the pipe mouth due to excessive operation. When the sealing piece presses against the pipe mouth, the flexible compensation deformation effect can achieve sealing protection for the pipe mouth, effectively preventing dust and other impurities from entering the pipe mouth and affecting the accuracy of gas concentration detection.

[0020] As a further improvement, an air inlet hole is provided through the blocking member at a position away from the flexible sealing structure.

[0021] The beneficial effects are: accelerating the speed of the gas to be detected entering the interior of the detection equipment, increasing the amount of the gas to be detected entering the interior of the detection equipment, and improving the detection work speed.

[0022] As a further improvement: air inlet holes are arranged around the outer shell.

[0023] The beneficial effects are: further increasing the passage for the gas to be detected to enter the detection device, increasing the amount of gas to be detected entering the detection device, and also improving the speed of collecting the gas to be detected, making the gas concentration detection result more accurate, more reliable, and more efficient.

[0024] The technical solution of the gas concentration detection equipment using the above-mentioned pipe orifice sealing device provided by the utility model is: a gas concentration detection equipment, including a detection host, the detection host is connected to an air intake pipe, the pipe orifice of the air intake pipe is detachably connected to the pipe orifice sealing device, the pipe orifice sealing device includes an outer shell, the outer shell has a connecting structure for being detachably connected to the pipe orifice, a sealing piece is movably installed on the outer shell in a direction opposite to the pipe orifice, and a locking structure is provided on the outer shell for keeping the sealing piece in a position to seal the pipe orifice.

[0025] The beneficial effects are as follows: the pipe orifice plugging device is detachably connected to the pipe orifice of the air inlet pipe of the gas concentration detection equipment, which is convenient and quick to disassemble, easy to clean and replace, and the detection personnel can replace and adjust the pipe orifice plugging device according to the usage situation, which is more adaptable; the improvement of the pipe orifice plugging device is that a plugging piece is movably installed on the outer shell in the direction opposite to the pipe orifice, and the plugging piece moves toward the pipe orifice to press the pipe orifice, and the position of the plugging piece is fixed by a locking structure to complete the plugging of the pipe orifice, so as to achieve a sealed state where there is no gap between the plugging piece and the pipe orifice. It can effectively prevent foreign impurities from entering the interior of the detection equipment through the pipe orifice through the air inlet pipe, thereby reducing the accuracy of the gas concentration detection results and preventing losses caused by erroneous judgments; at the same time, it ensures the internal cleanliness of the detection equipment, extending the service life of the detection equipment and the safe and stable operation cycle

[0026] As a further improvement, a slide groove extending along the direction of the pipe opening is provided on the outer shell, and a limiting block is connected to the blocking member, and the limiting block is slidably installed with the guide of the slide groove.

[0027] The beneficial effect is that the slide groove provides a movable channel coaxial with the extension direction of the pipe opening for the limit block, so that the movement of the blocking piece toward / away from the pipe opening is smooth and reliable.

[0028] As a further improvement, the locking structure is a U-shaped groove in the same direction as the pipe mouth, the groove section corresponding to the parallel edge of the U-shaped groove is connected to the lower part of the slide groove, or the locking structure is an L-shaped groove with a vertical edge connected to the slide groove.

[0029] The beneficial effect is that the locking structure can fix the position of the blocking piece, so that the blocking piece is fixed at the position of blocking the pipe opening, so that the blocking piece can achieve sealing protection for the pipe opening.

[0030] As a further improvement, the edge of the limit block has a force-applying section that passes through the outer wall of the housing and exposes a slide groove for the operator to slide.

[0031] The beneficial effect is that the position of the blocking member can be adjusted quickly and directly by controlling the force application section of the limit block.

[0032] As a further improvement, the limiting block is detachably connected to the blocking member.

[0033] The beneficial effect is that the blocking piece can be taken out from the outer shell by disassembling the limit block, which is convenient for cleaning and replacement of the blocking piece.

[0034] As a further improvement, an elastic component for keeping the blocking member away from the pipe opening is provided between the blocking member and the outer shell.

[0035] The beneficial effect is that when the limit block is adjusted to the slide groove, the locking structure no longer has a fixing effect on the blocking piece. At this time, the elastic component stretches and pops open in the direction away from the pipe mouth. At the same time, the blocking piece is moved away from the pipe mouth by the elastic component, and the air inlet channel is opened, preparing for the next step of gas concentration detection.

[0036] As a further improvement, a flexible sealing structure is provided on the blocking member at a position corresponding to the direction of the pipe opening.

[0037] The beneficial effect is: due to the buffering of the flexible sealing structure, the sealing piece will not cause wear to the pipe mouth due to excessive operation. When the sealing piece presses against the pipe mouth, the flexible compensation deformation effect can achieve sealing protection for the pipe mouth, effectively preventing dust and other impurities from entering the pipe mouth and affecting the accuracy of gas concentration detection.

[0038] As a further improvement, an air inlet hole is provided through the blocking member at a position away from the flexible sealing structure.

[0039] The beneficial effects are: accelerating the speed of the gas to be detected entering the interior of the detection equipment, increasing the amount of the gas to be detected entering the interior of the detection equipment, and improving the detection work speed.

[0040] As a further improvement: air inlet holes are arranged around the outer shell.

[0041] The beneficial effects are: further increasing the channel for the gas to be detected to enter the interior of the detection equipment, thereby increasing the amount of gas to be detected entering the detection equipment, and also improving the speed of collecting the gas to be detected, making the gas concentration detection result more accurate, more reliable, and more efficient in detection. The blocking part can be removed from the outer shell by disassembling the limit block, which is convenient for cleaning and replacement of the blocking part. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic structural diagram of Embodiment 1 of the pipe orifice plugging device provided by the utility model;

[0043] Figure 2 A cross-sectional view of embodiment 1 of the pipe orifice plugging device provided by the utility model;

[0044] Figure 3 This is a schematic diagram of the overall structure of the gas concentration detection equipment provided by the utility model.

[0045] In the figure: 1. outer shell, 2. connecting structure, 3. pipe mouth, 4. sealing member, 5. limit block, 6. slide groove, 7. force section, 8. locking structure, 9. protruding structure, 10. flexible sealing structure, 11. elastic component, 12. air inlet, 13. detection host, 14. display screen, 15. control key, 16. function button; 17. pipe mouth sealing device. DETAILED DESCRIPTION

[0046] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0047] During the gas concentration detection process, the precision of the detection equipment often determines the accuracy of the detection results. Therefore, it is necessary to ensure that the detection equipment is effectively isolated from the external environment. After the detection is completed, the channel for external gas to enter the detection equipment should be closed in time to ensure the cleanliness of the internal environment of the detection equipment.

[0048] The utility model provides a gas concentration detection device. After the gas concentration detection work is completed, the pipe mouth sealing device in the device can be used to timely and effectively seal the pipe mouth to prevent foreign dust and other impurities from entering the detection device through the pipe mouth through the air intake pipe, thereby ensuring the accuracy of the equipment detection result, extending the service life of the equipment and the safe and stable operation cycle.

[0049] Specific embodiment 1 of the gas concentration detection device provided by the utility model:

[0050] like Figures 1 to 3 As shown, a gas concentration detection device includes a detection host 13, a display screen 14 is fixedly installed on the front surface of the detection host 13, a control key 15 is fixedly installed on the detection host 13 below the display screen 14, and function buttons 16 are symmetrically arranged on the left and right sides of the control key 15. The control key 15 and the function buttons 16 constitute a control component. The detection host 13 is connected to an air intake pipe orifice 3, and the air intake pipe orifice 3 is detachably connected to the orifice blocking device 17.

[0051] When the utility model is in use, the gas to be detected enters the detection host 13 through the pipe port 3 for concentration detection, and the detection result is directly displayed on the display screen 14, which is intuitive and fast and convenient for direct judgment.

[0052] The pipe mouth plugging device 17 of the utility model is detachably connected to the pipe mouth 3 of the air intake pipe, which is quick to disassemble and easy to clean. The detection personnel can replace and adjust the pipe mouth plugging device 17 according to the usage to meet different detection needs and has strong adaptability. However, due to the current huge demand for natural gas, the number of natural gas pipelines has increased dramatically, and because the safe transportation of natural gas pipelines is of great importance, regular leakage detection is required, so this device is more commonly used in natural gas concentration detection.

[0053] like Figure 1 to Figure 2 As shown, the above-mentioned pipe orifice plugging device 17 includes an outer shell 1, which is cylindrical and has a connecting structure 2 for fixedly connecting to the pipe orifice 3, and the pipe orifice plugging device 17 is connected to the pipe orifice 3 through the connecting structure 2. Among them, the connecting structure 2 is a sealing member arranged at the bottom of the outer shell 1, and the center of the sealing member has an opening. The pipe orifice 3 of the air intake pipe passes through the sealing member opening and is connected to the device, and the sealing member wraps the pipe orifice 3 in all directions. In particular, the connecting structure 2 can also be a rubber ring with a sealing protection effect that matches the diameter of the pipe orifice 3, and the pipe orifice plugging device is set on the pipe orifice 3 through the rubber ring.

[0054] A plugging member 4 is movably mounted on the outer shell 1 in the direction facing the pipe opening 3. The plugging member 4 may be in the shape of a plate or a block, and has a certain thickness. The plugging member 4 can be inserted into the pipe opening 3 to plug the end face of the pipe opening 3, so as to achieve a sealed state in which there is no gap between the plugging member 4 and the pipe opening 3 when plugging. The end of the plugging member 4 is detachably connected to a limiting block 5. A slide groove 6 is coaxially arranged on the outer shell 1 and its outer wall. The slide groove 6 penetrates the outer wall of the outer shell 1 and extends in the direction of the pipe opening 3. After the edge of the limit block 5 passes through the slide groove 6, the part that leaks out of the outer wall of the outer shell 1 forms a force-applying section 7. The operator controls the force-applying section 7 to move the blocking member 4 in the outer shell 1 along the direction coaxial with the extension direction of the pipe mouth; to ensure that the blocking member 4 moves smoothly in the outer shell 1, at least two slide grooves 6 are set at relative positions on the outer shell 1, and more than one slide groove may be set, but the number of slide grooves 6 needs to be consistent with the number of limit blocks 5, that is, each limit block 5 is slidably installed with the corresponding slide groove 6 as a guide.

[0055] The outer shell 1 is also connected with a locking structure 8 at the bottom of the slide groove 6. The locking structure 8 is a U-shaped groove that is consistent with the direction of the pipe mouth 3. The groove section corresponding to the parallel side of the U-shaped groove is connected to the lower part of the slide groove 6. Since the force section 7 at the end of the limit block 5 is exposed to the outer wall of the outer shell 1, the U-shaped groove can effectively prevent the force section 7 from rotating, so that the locking structure 8 has a more reliable fixing effect on the blocking member 4. When the blocking member 4 presses against the pipe mouth 3, the force section 7 on the limit block 5 is controlled to move from the slide groove 6 to the locking structure 8. At this time, the position of the blocking member 4 is fixed so that the blocking member 4 presses against the pipe mouth 3 to seal the pipe mouth 3, thereby realizing the sealing protection of the blocking member 4 on the pipe mouth 3.

[0056] Furthermore, at least two protrusion structures 9 are symmetrically arranged on the outer edge of the blocking member 4. The blocking member 4 is plugged into the limiting block 5 through the protrusion structure 9. The blocking member 4 can be removed from the outer shell 1 by removing the limiting block 5, so that the blocking member 4 can be cleaned and replaced conveniently.

[0057] In order to better achieve the sealing of the pipe mouth 3 by the sealing piece 4, a flexible sealing structure 10 is arranged on the sealing piece 4. The flexible sealing structure 10 can be a rubber pad matching the size of the pipe mouth or a sealing pad with a shock-absorbing function. It is generally a cylindrical shape corresponding to the shape of the pipe mouth and having a certain thickness. When the control limit block 5 moves toward the pipe mouth 3, due to the buffering of the flexible sealing structure 10, the sealing piece 4 will not cause wear to the pipe mouth 3 due to excessive operation. When the sealing piece 4 presses against the pipe mouth 3, the flexible compensation deformation effect further achieves sealing protection for the pipe mouth 3, effectively preventing impurities such as dust from entering the pipe mouth 3 and affecting the accuracy of detection work such as gas concentration in the pipeline.

[0058] When concentration detection is required, the force-applying section 7 is controlled to move away from the pipe mouth 3 so that the gas to be detected enters the detection equipment from the pipe mouth 3. At this time, in order to be able to pop open the blocking piece 4 more quickly to make the air inlet pipe unblocked and fix the position of the blocking piece 4, an elastic component 11 is arranged between the connecting structure 2 of the outer shell 1 and the top of the outer shell 1. The elastic component 11 is a spring with a certain recovery performance. When the blocking piece 4 presses against the pipe mouth 3, the spring is compressed, and when the limit block 5 is adjusted to move from the locking structure 8 to the bottom of the slide groove 6, the locking structure 8 no longer fixes the position of the limit block 5. In the process of the spring recovering to its original length, the spring pops up in the direction away from the pipe mouth 3, and the blocking piece 4 is simultaneously moved away from the pipe mouth 3 by the spring and fixed; at this time, the gas can enter the interior of the detection equipment from the pipe mouth 3 through the air inlet channel for subsequent detection work.

[0059] When performing gas concentration detection, while the plugging member 4 no longer blocks the pipe opening 3, in order to improve the detection efficiency and ensure that sufficient gas enters the detection device, a rectangular opening is provided through the outer shell 1, and the gas can enter the air intake pipe through the rectangular opening. Furthermore, a rectangular opening is provided through the plugging member 4 at a position avoiding the flexible sealing structure 10, and the shape of the rectangular opening can be changed to a strip opening, an elliptical opening, etc., as long as it is an opening that penetrates the outer shell 1 and the plugging member 4 and can realize the flow of gas, that is, the air intake hole 12, it is not limited to the shape of the air intake hole 12. At this time, the gas can enter the detection device from the pipe opening 3 through the air intake pipe in multiple directions, so that the concentration detection result is more accurate, more reliable, and the detection efficiency is faster.

[0060] After the gas concentration is detected, the device controls the force section 7 of the limit block 5 to move in the slide groove 6, so that the blocking member 4 moves toward the pipe opening 3 to press the pipe opening 3, and the position of the blocking member 4 is fixed by the locking structure 8 to complete the blocking of the pipe opening 3, which can effectively prevent foreign impurities from entering the interior of the detection host 13 through the air intake pipe, thereby reducing the accuracy of the concentration detection result and preventing losses caused by erroneous judgments. At the same time, it ensures the internal cleanliness of the detection equipment, prolonging the service life and safe and stable operation cycle of the detection equipment.

[0061] Specific embodiment 2 of the pipe orifice blocking device provided by the utility model:

[0062] The main difference between it and Example 1 is that: in Example 1, the locking structure 8 is a U-shaped groove facing the pipe mouth 3, while in this embodiment, the locking structure 8 is an L-shaped groove. At this time, the vertical side of the L-shaped groove is connected to the slide groove 6, and the other side of the L-shaped groove locks and fixes the blocking member 4.

[0063] Specific embodiment 3 of the pipe orifice blocking device provided by the utility model:

[0064] The main difference between it and Example 1 is that: in Example 1, the locking structure 8 is a U-shaped groove facing the pipe mouth 3, and the end of the sealing member 4 is detachably connected to the limiting block 5. In this embodiment, the locking structure 8 is an internal thread arranged on the inner wall of the outer shell 1, and the outer edge of the sealing member 4 is provided with a corresponding external thread. The sealing member 4 is rotated to move up and down in the outer shell 1 through the thread pair and fix its position.

[0065] Specific embodiment 4 of the pipe orifice blocking device provided by the utility model:

[0066] The main difference between it and Example 1 is that the locking structure 8 in Example 1 is a U-shaped groove facing the pipe mouth, while in this embodiment, a pin hole is provided on the outer edge of the sealing member 4. When the sealing member 4 presses against the pipe mouth 3, a cotter pin is screwed into the pin hole to fix the position of the sealing member 4. At this time, the pin hole and the cotter pin constitute the locking structure 8.

[0067] Specific embodiment 5 of the pipe orifice blocking device provided by the utility model:

[0068] The main difference between it and Example 1 is that: in Example 1, at least two protrusion structures 9 are symmetrically arranged on the outer edge of the blocking member 4, and the blocking member 4 is inserted into the limiting block 5 through the protrusion structure 9; in this embodiment, the blocking member 4 can be threadedly connected to the limiting block 5, and at this time, the disassembly of the limiting block 5 and the blocking member 4 is also convenient and quick.

[0069] Specific embodiment 6 of the pipe orifice blocking device provided by the utility model:

[0070] The main difference between it and Example 1 is that: in Example 1, at least two protrusion structures 9 are symmetrically arranged on the outer edge of the sealing member 4, and the sealing member 4 is inserted into the limiting block 5 through the protrusion structure 9; in this embodiment, an annular groove is opened on the circumference of the sealing member 4, and the cross-sectional shape of the annular groove is adapted to the cross-sectional shape of the end of the limiting block 5, and the end of the limiting block 5 is installed in the annular groove, so that the sealing member 4 is connected to the outer shell 1.

[0071] The embodiments of the pipe orifice plugging device of the present invention are the same as the embodiments of the pipe orifice plugging device in the embodiments of the gas concentration detection device of the present invention, and will not be described in detail here.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipe orifice plugging device, comprising an outer shell (1), characterized in that: The outer shell (1) has a connection structure (2) for being detachably connected to the pipe mouth (3), a blocking piece (4) is movably mounted on the outer shell (1) in a direction directly opposite to the pipe mouth (3), and a locking structure (8) is provided on the outer shell (1) for retaining the blocking piece (4) in a position for blocking the pipe mouth.

2. The pipe orifice plugging device according to claim 1, characterized in that: The outer shell (1) is provided with a slide groove (6) extending in the direction of the pipe opening, the blocking member (4) is connected to a limit block (5), and the limit block (5) and the slide groove (6) are installed in a guided sliding manner.

3. The pipe orifice plugging device according to claim 2, characterized in that: The locking structure (8) is a U-shaped groove in the same direction as the pipe mouth (3), and the groove section corresponding to the parallel side of the U-shaped groove is connected to the lower part of the slide groove (6), or the locking structure (8) is an L-shaped groove with a vertical side connected to the slide groove (6).

4. The pipe orifice plugging device according to claim 2, characterized in that: The edge of the limit block (5) has a force-applying section (7) that passes through the outer wall of the outer shell (1) and exposes the slide groove (6) for an operator to slide.

5. The pipe orifice plugging device according to any one of claims 2 to 4, characterized in that: The limiting block (5) is detachably connected to the blocking piece (4).

6. The pipe orifice plugging device according to any one of claims 1 to 4, characterized in that: An elastic component (11) is provided between the blocking piece (4) and the outer shell (1) and is used to move the blocking piece (4) away from the pipe opening (3).

7. The pipe orifice plugging device according to any one of claims 1 to 4, characterized in that: A flexible sealing structure (10) is provided on the blocking member (4) at a position corresponding to the direction of the pipe opening (3).

8. The pipe orifice plugging device according to claim 7, characterized in that: An air inlet hole (12) is provided through the blocking member (4) at a position away from the flexible sealing structure (10).

9. The pipe orifice plugging device according to any one of claims 1 to 4, characterized in that: The outer shell (1) is provided with air inlet holes (12) extending through the periphery thereof.

10. A gas concentration detection device, characterized in that: The detection host (13) comprises an air intake pipe opening (3) connected to the detection host (13), the air intake pipe opening (3) being detachably connected to a pipe opening blocking device, wherein the pipe opening blocking device is the pipe opening blocking device according to any one of claims 1 to 9.

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