Gas cell suitable for airborne aerosol sampling and analysis equipment

Abstract

The application relates to the technical field of radiation detection, in particular to a gas chamber suitable for an airborne aerosol sampling and analyzing device, which comprises a gas chamber for inhaling air and an alpha-beta detector in communication with the gas chamber; the alpha-beta detector is used for online analysis of radioactive aerosols; a sampling sheet for collecting a radioactive aerosol sample is arranged in the gas chamber; the gas chamber suitable for the airborne aerosol sampling and analyzing device further comprises a replacement mechanism for fixing the sampling sheet and capable of replacing the sampling sheet. The application designs a gas chamber, integrates the detector, filter paper, air path and replacement mechanism for replacing the filter paper in a small volume structure, has high integration degree, small volume, light weight, easy replacement of the filter paper, is suitable for various detection devices such as fixed type and mobile type, and is especially suitable for airborne detection devices.

Description

Technical Field

[0001] This application relates to the field of radiation detection technology, and in particular to a gas chamber suitable for airborne aerosol sampling and analysis equipment. Background Technology

[0002] Following a nuclear accident, radioactive materials leak into the air, combining with airborne particles to form radioactive aerosols. If workers inhale air containing these aerosols, some of the radioactive particles will remain in their bodies, causing internal radiation exposure. Internal radiation is more harmful than external radiation, making radioactive aerosol detection crucial for protecting the health of workers. Currently, the best detection method involves using drones equipped with nuclear radiation detection devices to enter the nuclear accident site.

[0003] For αβ aerosol sampling and analysis equipment, in order to achieve the function of simultaneous sampling and analysis, the αβ detector and filter paper need to be integrated into the gas chamber, and the filter paper needs to be easy to replace.

[0004] Currently, ground-based fixed and mobile αβ aerosol detection equipment has a large gas chamber volume and heavy weight, making it unsuitable for mounting on small drones, and the filter paper is difficult to replace. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a gas chamber suitable for airborne aerosol sampling and analysis equipment. This application designs a gas chamber that integrates a detector, filter paper, gas path, and a filter paper replacement mechanism into a very small volume structure. This design features high integration, small size, light weight, and easy filter paper replacement, making it suitable for various detection devices, including fixed and mobile types, and particularly for airborne detection equipment.

[0006] The following technical solution is adopted for the gas chamber of airborne aerosol sampling and analysis equipment:

[0007] A gas chamber suitable for an airborne aerosol sampling and analysis device includes a gas chamber for drawing in air and an αβ detector connected to the gas chamber; the αβ detector is used for online analysis of radioactive aerosols; the gas chamber is provided with a sampling strip for collecting radioactive aerosol samples, and the gas chamber suitable for an airborne aerosol sampling and analysis device also includes a replacement mechanism for fixing the sampling strip and being able to replace the sampling strip.

[0008] By adopting the above technical solution, after air is drawn into the gas chamber, the αβ detector performs online analysis of radioactive aerosols in the air. A sampling plate samples the radioactive aerosols in the air. When the sampling plate needs to be replaced, it can be easily removed by opening the replacement mechanism, and a new sampling plate can be placed into the gas chamber. The replacement mechanism then secures the sampling plate again, making the replacement of the sampling plate simple and convenient. This application integrates the αβ detector with the gas chamber and integrates the sampling plate within the gas chamber, resulting in high integration, small size, and light weight. It is suitable for fixed, mobile, or other types of detection equipment, and is particularly suitable for airborne detection equipment.

[0009] Optionally, the air inlet of the αβ detector is connected to an air inlet connector, and the air inlet connector and the αβ detector are sealed together by an air inlet sealing ring; the air chamber is provided with an exhaust duct for exhausting air, and the exhaust port of the exhaust duct is connected to an exhaust connector, and the exhaust connector and the air chamber are sealed together by an exhaust sealing ring.

[0010] By adopting the above technical solutions, the intake sealing ring can increase the sealing performance of the connection between the intake connector and the αβ detector, and the exhaust sealing ring can increase the sealing performance of the connection between the exhaust connector and the exhaust passage.

[0011] Optionally, the air chamber is provided with a cleaning air hole that communicates with the exhaust passage, and the cleaning air hole can be detachably connected to a plug for sealing the cleaning air hole.

[0012] By adopting the above technical solution, dust will accumulate on the exhaust duct and the inner wall of the gas chamber after the radiation detection equipment has been running for a period of time, requiring regular cleaning. Opening the plug and inserting the external cleaning brush into the cleaning vent will clean the exhaust duct and the inner wall of the gas chamber; furthermore, the amount of radioactive aerosols collected by the sampling plate can be observed through the cleaning vent, allowing for timely determination of whether the sampling plate needs to be replaced.

[0013] Optionally, the αβ detector and the gas chamber are sealed together by a front sealing ring.

[0014] By adopting the above technical solution, the front sealing ring can increase the sealing performance between the αβ detector and the gas chamber, thereby improving the detection accuracy of the αβ detector for radioactive aerosols.

[0015] Optionally, the air chamber of the airborne aerosol sampling and analysis equipment also includes a housing, wherein the air chamber is installed inside the housing and connected to the side wall of the housing, and the housing has a replacement port that communicates with the air chamber; the replacement mechanism includes a door and a top spring; the door is hinged to the housing to close the replacement port, the top spring is placed between the sampling plate and the door, and the door presses the sampling plate against the top spring; the door and the housing are provided with a locking component to lock and fix the door.

[0016] By adopting the above technical solution, when it is necessary to replace the sampling strip, the locking component is unlocked, the top spring releases its elasticity and can automatically open the chamber door. After removing the top spring, the sampling strip can be directly taken out. Then, the new sampling strip is placed into the air chamber, the top spring is placed into the air chamber, and after closing the chamber door, the chamber door is pressed against the sampling strip by the top spring, and the chamber door is locked by the locking component. The whole process makes the replacement of the sampling strip simple and quick.

[0017] Optionally, the locking assembly includes a latch and a locking rod. The locking rod is fixedly embedded in the side wall of the housing. The latch passes through the compartment door and slides with the compartment door. The end of the latch facing the locking rod has a slot and a groove that communicate with each other. The locking rod can be inserted into the latch through the slot or groove. The locking rod can only be located in the slot or groove alone.

[0018] By adopting the above technical solution, when unlocking the compartment door, rotating the latch causes the locking rod to retract from the lock groove and align with the slot, allowing the latch and locking rod to separate. Pulling the latch out from inside the compartment door enables quick unlocking. After closing the compartment door again, inserting the latch into the door and rotating it causes the locking rod to sequentially enter the slot and lock groove, connecting the latch and locking rod, thus achieving quick locking of the compartment door.

[0019] Optionally, the sampling sheet includes filter paper and a support mesh, with the filter paper and the support mesh bonded together.

[0020] By adopting the above technical solution, the support net can effectively support the filter paper, keeping the filter paper in a flat and unfolded state, so that radioactive aerosols can be evenly attached to the filter paper.

[0021] Optionally, the support net is fixedly provided with clamping pieces.

[0022] By adopting the above technical solution, when picking up and placing the sampling piece, the support net can be picked up and placed stably by clamping the piece with external tools, which facilitates the stable picking up and placing of the sampling piece.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. This application integrates the αβ detector with the gas chamber and integrates the sampling plate into the gas chamber. It has high integration, small size and light weight, and is suitable for fixed, mobile or other detection equipment, especially for airborne detection equipment;

[0025] 2. The sampling strip can be easily removed by opening the replacement mechanism, and then a new sampling strip can be placed into the air chamber. The sampling strip can be fixed again with the help of the replacement mechanism, making the replacement of the sampling strip simple and convenient.

[0026] 3. The support net can effectively support the filter paper, keeping it flat and allowing radioactive aerosols to adhere evenly to the filter paper. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the gas chamber structure of an airborne aerosol sampling and analysis device according to an embodiment of this application;

[0028] Figure 2 This is an exploded view showing the separation of the gas chamber and the αβ detector.

[0029] Figure 3 This is a schematic diagram of the structure with the warehouse door closed;

[0030] Figure 4 This is an exploded view of the changing mechanism with the door open.

[0031] Figure 5 This is a schematic diagram of the lock mechanism in the locked state by the locking rod.

[0032] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Replacement port; 2. Air chamber; 21. Exhaust duct; 22. Exhaust connector; 23. Exhaust sealing ring; 24. Cleaning vent; 25. Plug head; 26. Front sealing ring; 3. αβ detector; 31. Inlet connector; 32. Inlet sealing ring; 4. Sampling plate; 41. Filter paper; 42. Support mesh; 421. Clamping plate; 5. Replacement mechanism; 6. Door; 7. Top spring; 8. Locking assembly; 81. Locking buckle; 811. Slot; 812. Lock groove; 82. Locking rod. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0034] This application discloses a gas chamber suitable for airborne aerosol sampling and analysis equipment, referring to... Figure 1 and Figure 2 The air chamber for airborne aerosol sampling and analysis equipment includes a housing 1, an air chamber 2 housed within the housing 1, and an αβ detector 3. The air chamber 2 is fixedly connected to the side wall of the housing 1 by screws and is used to draw in air for sampling. The αβ detector 3 is connected to the air chamber 2 and is used for online analysis of radioactive aerosols. The air inlet of the αβ detector 3 is connected to an air inlet connector 31, which is used to connect to an air inlet pipe. The air chamber 2 has an integrally formed exhaust duct 21 for venting exhaust air, and the exhaust port of the exhaust duct 21 is connected to an exhaust connector 22, which is used to connect to an exhaust pipe.

[0035] After air is drawn into the gas chamber 2, the αβ detector 3 performs online analysis of radioactive aerosols in the air; the gas chamber 2 samples the radioactive aerosols in the air. This application integrates the αβ detector 3 with the gas chamber 2 and integrates the sampling plate 4 into the gas chamber 2, resulting in high integration, small size, and light weight. It is suitable for fixed, mobile, or other types of detection equipment, and is especially suitable for airborne detection equipment.

[0036] Reference Figure 1 and Figure 2 The αβ detector 3 and the gas chamber 2 are jointly sealed by a front sealing ring 26, which increases the sealing performance between the αβ detector 3 and the gas chamber 2, thereby improving the detection accuracy of the αβ detector 3 for radioactive aerosols. The inlet connector 31 and the αβ detector 3 are jointly sealed by an inlet sealing ring 32, which increases the sealing performance between the inlet connector 31 and the αβ detector 3. The exhaust connector 22 and the gas chamber 2 are jointly sealed by an exhaust sealing ring 23, which increases the sealing performance between the exhaust connector 22 and the exhaust duct 21.

[0037] Reference Figure 1 and Figure 2 The gas chamber 2 has a cleaning vent 24 that communicates with the exhaust duct 21. A plug 25 is inserted into the cleaning vent 24 to seal it. When the exhaust duct 21 needs to be cleaned periodically, the plug 25 is removed, and an external cleaning brush is inserted into the cleaning vent 24 to clean the exhaust duct 21 and the inner wall of the gas chamber 2. The amount of radioactive aerosols collected by the sampling strip 4 can be observed through the cleaning vent 24 to determine whether the sampling strip 4 needs to be replaced.

[0038] Reference Figure 3 and Figure 4 The gas chamber 2 is equipped with a sampling strip 4 for collecting radioactive aerosol samples. The side wall of the housing 1 has a replacement port 11 that communicates with the gas chamber 2, through which the sampling strip 4 can be placed and removed. The gas chamber suitable for airborne aerosol sampling and analysis equipment includes a replacement mechanism 5 for fixing the sampling strip 4 and for replacing the sampling strip 4.

[0039] Reference Figure 3 and Figure 4 The replacement mechanism 5 includes a door 6 and a top spring 7. The door 6 is located outside the housing 1, and a crossbar passes through both the door 6 and the housing 1, hinged to the door 6. The door 6 is used to close the replacement port 11. The top spring 7 is located inside the air chamber 2, between the sampling piece 4 and the door 6. When the door 6 is closed, the top spring 7 is compressed, and the door 6 presses against the sampling piece 4 via the top spring 7. The door 6 and the housing 1 share a locking assembly 8 to lock and secure the door 6.

[0040] The process of replacing the sampling piece 4 is as follows: Unlock the locking component 8, the top spring 7 releases its elasticity and automatically opens the chamber door 6, remove the top spring 7 and directly remove the sampling piece 4, put the new sampling piece 4 into the air chamber 2, put the top spring 7 into the air chamber 2, close the chamber door 6, and use the locking component 8 to lock the chamber door 6.

[0041] Reference Figure 3 , Figure 4 and Figure 5 In this embodiment, there are two sets of locking components 8, including a latch 81 and a locking rod 82. The locking rod 82 is fixedly embedded in the side wall of the housing 1; the latch 81 passes through the door 6 and slides with the door 6, and a pull ring is hinged to the end of the latch 81 located outside the door 6. The two ends of the pull ring are inserted into the latch 81 through the side wall of the latch 81 and are rotatably connected to the latch 81; the axis of the latch 81 intersects perpendicularly with the axis of the locking rod 82, and the end of the latch 81 facing the locking rod 82 has a slot 811 and a locking groove 812 that communicate with each other. The extension directions of the slot 811 and the locking groove 812 are perpendicular to each other; the locking rod 82 can be inserted and engaged with the latch 81 through the slot 811 or the locking groove 812, and the locking rod 82 can only be located in the slot 811 or the locking groove 812 alone.

[0042] Opening and closing the compartment door 6: To unlock the compartment door 6, rotate the latch 81 by pulling the ring, causing the locking rod 82 to disengage from the lock groove 812. The locking rod 82 is then aligned with the slot 811. Pull the ring to remove the latch 81 from the compartment door 6, thus quickly unlocking the compartment door 6. After closing the compartment door 6 again, insert the latch 81 into the compartment door 6 and rotate the latch 81 with the pull ring, causing the locking rod 82 to sequentially enter the slot 811 and the lock groove 812, thus locking the latch 81 and the locking rod 82, and quickly locking the compartment door 6.

[0043] Reference Figure 3 and Figure 4 The sampling sheet 4 includes filter paper 41 and a support net 42. The filter paper 41 and the support net 42 are bonded together. The filter paper 41 is located between the support net 42 and the αβ detector 3. In this embodiment, the filter paper 41 is made of high-efficiency glass fiber filter paper with a filtration efficiency of up to 99% (0.5μm). The support net 42 is integrally formed with two opposing clamping plates 421. The support net 42 keeps the filter paper 41 in a flat and unfolded state, allowing the radioactive aerosol to adhere evenly to the filter paper 41. When the sampling sheet 4 is picked up or put down, the clamping plates 421 are clamped by external tools, which allows the support net 42 to be picked up or put down stably, facilitating the stable picking up and putting down of the sampling sheet 4.

[0044] The implementation principle of the air chamber of the airborne aerosol sampling and analysis equipment in this application embodiment is as follows: after the air chamber 2 draws air into the interior of the air chamber 2 through the air inlet connector 31, the αβ detector 3 performs online analysis on the radioactive aerosols in the air; the sampling plate 4 in the air chamber 2 samples the radioactive aerosols in the air, and then the air is discharged through the exhaust duct 21 and the exhaust connector 22.

[0045] When replacing the sampling piece 4, rotate the latch 81 by pulling the ring to disengage the locking rod 82 from the locking groove 812. The locking rod 82 is then aligned with the slot 811. Pull the ring to remove the latch 81 from the door 6, unlocking the door 6. The top spring 7 releases its elasticity and automatically opens the door 6. After removing the top spring 7, directly remove the sampling piece 4 and place the new sampling piece 4 into the air chamber 2. Then, place the top spring 7 into the air chamber 2, close the door 6, insert the latch 81 into the door 6, and rotate the latch 81 with the help of the pull ring to allow the locking rod 82 to enter the slot 811 and the locking groove 812 in sequence, thus achieving a locking connection between the latch 81 and the locking rod 82, thereby achieving quick locking of the door 6.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas chamber suitable for airborne aerosol sampling and analysis equipment, characterized in that: It includes an air chamber (2) for inhaling air and an αβ detector (3) connected to the air chamber (2); the αβ detector (3) is used for online analysis of radioactive aerosols; the air chamber (2) is provided with a sampling strip (4) for collecting radioactive aerosol samples, and the air chamber suitable for airborne aerosol sampling and analysis equipment also includes a replacement mechanism (5) for fixing the sampling strip (4) and being able to replace the sampling strip (4); The air inlet of the αβ detector (3) is connected to an air inlet connector (31), and the air inlet connector (31) and the αβ detector (3) are sealed together by an air inlet sealing ring (32); the air chamber (2) is provided with an exhaust duct (21) for exhausting air, and the exhaust port of the exhaust duct (21) is connected to an exhaust connector (22), and the exhaust connector (22) and the air chamber (2) are sealed together by an exhaust sealing ring (23); The air chamber (2) is provided with a cleaning air hole (24) communicating with the exhaust passage (21), and the cleaning air hole (24) is detachably connected to a plug head (25) for sealing the cleaning air hole (24); The air chamber for the airborne aerosol sampling and analysis equipment also includes a housing (1), the air chamber (2) is installed inside the housing (1) and connected to the side wall of the housing (1), the housing (1) has a reserved replacement port (11) communicating with the air chamber (2); the replacement mechanism (5) includes a door (6) and a top spring (7); the door (6) is hinged to the housing (1) to close the replacement port (11), the top spring (7) is placed between the sampling piece (4) and the door (6), the door (6) presses the sampling piece (4) against the top spring (7); the door (6) and the housing (1) are provided with a locking component (8) to lock the door (6) in place; The locking assembly (8) includes a latch (81) and a locking rod (82). The locking rod (82) is fixedly embedded in the side wall of the housing (1). The latch (81) passes through the door (6) and slides with the door (6). The end of the latch (81) facing the locking rod (82) has a slot (811) and a locking groove (812) that are interconnected. The locking rod (82) can be inserted into the latch (81) through the slot (811) or the locking groove (812). The locking rod (82) can only be located in the slot (811) or the locking groove (812) alone.

2. The gas chamber for airborne aerosol sampling and analysis equipment according to claim 1, characterized in that: The αβ detector (3) and the gas chamber (2) are jointly sealed by a front sealing ring (26).

3. The gas chamber for airborne aerosol sampling and analysis equipment according to claim 1, characterized in that: The sampling sheet (4) includes filter paper (41) and support mesh (42), with the filter paper (41) and support mesh (42) attached together.

4. The gas chamber for airborne aerosol sampling and analysis equipment according to claim 3, characterized in that: The support net (42) is fixed with a clamping piece (421).

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