High-accuracy air pollution detection device

Abstract

The invention discloses a high-accuracy air pollution detection device, and relates to the technical field of air pollution detection, the high-accuracy air pollution detection device comprises a detection host, a storage battery is installed in the detection host, a charging port for charging the storage battery is installed on the lower end face of the detection host, and an air inlet assembly capable of realizing dust filtration is installed on the upper end face of the detection host. According to the high-accuracy air pollution detection device, a gas compression function is integrated in a detection process, that is, a detection cylinder with a smaller volume is designed, and gas in a large-volume sampling cylinder is completely pushed into the detection cylinder by using a first piston head, so that the gas is compressed and pressurized in the detection cylinder; the increase of the gas pressure means that the molecular number density of the to-be-detected gas in a unit optical path is increased, an absorption signal of the to-be-detected gas to an infrared characteristic spectrum is enhanced, and the detection capability of low-concentration pollutants and the signal-to-noise ratio of a detection signal are greatly improved, so that high-accuracy detection is realized, and the device is particularly suitable for monitoring trace pollutants at an environment background level.

Description

Technical Field

[0001] This invention relates to the field of air pollution detection technology, specifically to a highly accurate air pollution detection device. Background Technology

[0002] Air pollution detection is an important part of environmental monitoring. The accurate monitoring of gaseous pollutants such as nitric oxide, nitrogen dioxide, and sulfur dioxide in the atmosphere is particularly important. Existing air pollution detection devices usually use direct sampling combined with sensor detection, but existing devices have some inherent defects. 1. Conventional sampling methods are mostly intermittent, meaning that sampling, detection, and exhaust processes are carried out at different times, which cannot achieve true continuous monitoring. There is a data gap between two samplings, making it difficult to capture instantaneous changes in pollutant concentrations. 2. For low-concentration pollutants, direct sampling results in a limited number of target gas molecules per unit volume, leading to a weak sensor signal, insufficient detection sensitivity, low signal-to-noise ratio, and difficulty in achieving accurate measurement, thus affecting the accuracy of the detection data. Summary of the Invention

[0003] The purpose of this invention is to provide a highly accurate air pollution detection device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-accuracy air pollution detection device, comprising a detection host, a storage battery installed inside the detection host, a charging port for charging the storage battery installed on the lower end face of the detection host, an air intake component for dust filtration installed on the upper end face of the detection host, an exhaust pipe fixed on the detection host, and a partition fixed inside the detection host. The sampling component achieves continuous air sampling and air compression through alternating motion, and the sampling component is installed inside the detection host. The detection component is used to accurately detect compressed gas and can automatically remove the detected gas. The detection component is installed on the partition.

[0005] Preferably, the air intake assembly includes an air intake pipe fixed to the upper end face of the detection host, and the air intake pipe is threadedly connected to the sampling head. The outer surface of the sampling head has an air intake port at an equal angle, and a filter screen fixed inside the sampling head is provided on the inner side of the air intake port. Through the function of the filter screen, dust in the air can be filtered to ensure the cleanliness of the sample gas. The threaded connection between the air intake pipe and the sampling head allows for easy disassembly and replacement of the sampling head.

[0006] Preferably, the sampling component includes a motor fixed inside the detection host, and the output end of the motor is fixed with a drive gear, and the drive gear meshes with the driven gear to achieve transmission. At the same time, the gear ratio of the drive gear to the driven gear is 1:2. Through the above structure, a basic guarantee can be provided for the normal operation of quantitative air sampling.

[0007] Preferably, a limit ring is fixed on the driven gear, and the driven gear, the limit ring, and the positioning block are slidably connected. There are three positioning blocks, and the positioning blocks are fixed to the detection host and the partition through the support rod. When the driven gear rotates, the sliding guidance between the limit ring and the positioning block can ensure the stability of the driven gear rotation.

[0008] Preferably, the driven gear has two convex shafts fixed on it, and the two convex shafts are distributed one above the other on the front and rear end faces of the driven gear. The convex shafts are slidably connected to the sliding rod, and the sliding rod is fixed to the square rod. A first piston head is fixed on the square rod, and the first piston head, the square rod, and the sampling cylinder are slidably connected. The sampling cylinder is fixed on the partition plate. Through the sliding action between the convex shafts and the sliding rod, a basic force can be provided for the up-and-down reciprocating motion of the square rod and the first piston head, thereby ensuring the normal operation of the device.

[0009] Preferably, a first one-way air inlet valve is fixed on the sampling cylinder, and the first one-way air inlet valve is connected to the air inlet pipe through a conduit. A first one-way air outlet valve is also fixed on the sampling cylinder. Through the action of the first one-way air inlet valve and the first one-way air outlet valve, the air can be ensured to move in one direction in the sampling cylinder, thereby ensuring the normal operation of the device.

[0010] Preferably, the detection assembly includes detection cylinders symmetrically fixed on the partition, with the internal volume of the detection cylinder being smaller than that of the sampling cylinder, the internal diameter of the detection cylinder being equal to that of the sampling cylinder, and a second one-way inlet valve fixed on the detection cylinder. The second one-way inlet valve is connected to a first one-way outlet valve via a conduit. The detection cylinder is also fixed with a second one-way outlet valve, which is connected to an exhaust pipe via a conduit. By limiting the internal volume of the detection cylinder, the sample gas can be compressed after entering the detection cylinder, thereby better meeting the detection requirements.

[0011] Preferably, an infrared light source is nested inside the upper part of the inner side of the detection cylinder, and a second piston is slidably linked inside the detection cylinder. An infrared detector is nested inside the second piston, and a round rod that is slidably connected to the detection cylinder is fixed at the lower end of the second piston. A spring is fixed between the round rod and the detection cylinder. Through the above structure, a basic guarantee can be provided for the detection of harmful gases in the gas, and the elasticity of the spring can provide a basic force for the automatic reset of the round rod and the second piston.

[0012] Preferably, a top rod is fixed on the round rod, and the top rod is located directly above the sliding rod. The reciprocating motion of the sliding rod can provide a basic force for the movement of the top rod.

[0013] Preferably, one end of the round rod and the connecting rod are fixed to each other, and the connecting rod and the detection cylinder are slidably connected. The other end of the connecting rod is fixed to the movable plate. At the same time, a guide groove is provided on the movable plate. The guide groove is slidably connected to the sliding rod. The sliding rod and the crossbar are fixed to each other, and the crossbar is slidably connected to the detection cylinder. The crossbar is connected to the sealing plate. The sealing plate is slidably connected inside the detection cylinder. The sealing plate cooperates with the through hole between the detection cylinder and the second one-way exhaust valve to achieve a sealing effect. With the above structure, it can be ensured that the gas in the detection cylinder will not leak from the second one-way exhaust valve when compressed, and a basic guarantee can be provided for the discharge of the detection gas.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This high-accuracy air pollution detection device integrates gas compression into the detection process. By designing a smaller detection cylinder and using a first piston head to push all the gas in the large-volume sampling cylinder into the detection cylinder, the gas is compressed and pressurized within the detection cylinder. The increased gas pressure means an increased number density of gas molecules per unit optical path, which enhances its absorption signal of the infrared characteristic spectrum. This greatly improves the detection capability for low-concentration pollutants and the signal-to-noise ratio of the detection signal, thus achieving high-accuracy detection. It is especially suitable for monitoring trace pollutants at the background level of the environment. 2. This highly accurate air pollution detection device uses a dual-piston mechanism driven by the same motor and with the convex shaft phases offset by 180 degrees, combined with a one-way valve control, to automatically alternate between the two sampling barrels and the two detection barrels for air extraction and exhaust. When one chamber is in the stage of collecting fresh air samples, the other chamber will discharge the residual gas that has been compressed and tested or the previous air sample, thus achieving seamless connection between sampling and exhaust, eliminating detection intervals, and providing uninterrupted continuous monitoring data. It is especially suitable for capturing rapid changes in pollutant concentrations. 3. This high-accuracy air pollution detection device features a linked exhaust sealing mechanism. When the first piston head reaches the exhaust stroke, it pushes the top rod via the sliding rod, which in turn drives the sealing plate to open the exhaust channel. Simultaneously, the second piston head of the detection cylinder moves upward to completely expel the exhaust gas from the cavity. After exhausting, the mechanism resets under the action of the spring, and the sealing plate re-closes the detection cavity, preparing for the next high-pressure test. This ensures the cleanliness of the cavity before each test, effectively avoids cross-interference of residual gas with subsequent test data, and guarantees the accuracy of continuous testing. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the detection host of the present invention, viewed from below. Figure 3 This is a frontal cross-sectional three-dimensional structural diagram of the air intake assembly of the present invention; Figure 4 This is a three-dimensional structural diagram of the partition plate of the present invention, viewed from the front and in cross-section. Figure 5 This is a frontal cross-sectional three-dimensional structural diagram of the sampling component and the detection component of the present invention; Figure 6 This is a frontal cross-sectional three-dimensional structural diagram of the sampling component of the present invention; Figure 7 This is a frontal cross-sectional three-dimensional structural diagram of the detection component of the present invention; Figure 8 This is a frontal three-dimensional structural diagram of the movable plate of the present invention.

[0016] In the diagram: 1. Detection host; 2. Battery; 3. Charging port; 4. Intake assembly; 401. Intake pipe; 402. Sampling head; 403. Intake port; 404. Filter screen; 5. Exhaust pipe; 6. Partition plate; 7. Sampling assembly; 701. Motor; 702. Drive gear; 703. Driven gear; 704. Limiting ring; 705. Positioning block; 706. Support rod; 707. Cam shaft; 708. Sliding rod; 709. Square rod; 710. First piston head; 711. 711. Sampling cylinder; 712. First one-way air inlet valve; 713. First one-way air outlet valve; 8. Detection assembly; 801. Detection cylinder; 802. Second one-way air inlet valve; 803. Second one-way air outlet valve; 804. Infrared light source; 805. Second piston; 806. Infrared detector; 807. Round rod; 808. Spring; 809. Top rod; 810. Connecting rod; 811. Movable plate; 812. Guide groove; 813. Slide rod; 814. Crossbar; 815. Sealing plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-8The present invention provides a technical solution: a high-accuracy air pollution detection device, including a detection host 1, a storage battery 2 installed inside the detection host 1, a charging port 3 for charging the storage battery 2 installed on the lower end face of the detection host 1, an air intake component 4 for dust filtration installed on the upper end face of the detection host 1, an exhaust pipe 5 fixed on the detection host 1, and a partition 6 fixed inside the detection host 1. The sampling component 7 achieves continuous air sampling and air compression through alternating motion. The sampling component 7 is installed inside the detection host 1. The detection component 8 is used to accurately detect compressed gas and can automatically remove the detected gas. The detection component 8 is installed on the partition plate 6.

[0019] The air intake assembly 4 includes an air intake pipe 401 fixed to the upper end face of the detection host 1, and the air intake pipe 401 is threadedly connected to the sampling head 402. An air inlet 403 is provided at equal angles on the outer surface of the sampling head 402, and a filter screen 404 fixed inside the sampling head 402 is provided inside the air inlet 403. The sampling assembly 7 includes a motor 701 fixed inside the detection host 1, and a drive gear 702 is fixed to the output end of the motor 701. The drive gear 702 meshes with a driven gear 703 to achieve transmission, and the gear ratio between the drive gear 702 and the driven gear 703 is 1:2. A limit ring 704 is fixed on the driven gear 703, and the driven gear 703, the limit ring 704, and the positioning block 705 are slidably connected. The positioning block 705 is positioned on... There are three, and the positioning block 705 is fixed to the detection host 1 and the partition 6 by the support rod 706; two convex shafts 707 are fixed on the driven gear 703, and the two convex shafts 707 are distributed one above the other on the front and rear end faces of the driven gear 703, and the convex shafts 707 are slidably connected to the sliding groove rod 708. At the same time, the sliding groove rod 708 is fixed to the square rod 709, and the first piston head 710 is fixed on the square rod 709. The first piston head 710, the square rod 709 and the sampling cylinder 711 are slidably connected, and the sampling cylinder 711 is fixed on the partition 6; a first one-way air inlet valve 712 is fixed on the sampling cylinder 711, and the first one-way air inlet valve 712 is connected to the air inlet pipe 401 through the conduit. A first one-way air outlet valve 713 is also fixed on the sampling cylinder 711. When using this highly accurate air pollution detection device, such as Figures 1-8As shown, by starting the motor 701, the driving gear 702 is driven to rotate. The meshing transmission between the driving gear 702 and the driven gear 703 allows the cam shaft 707 to rotate. The sliding action between the limiting ring 704 and the positioning block 705 ensures the stability of the rotation of the driven gear 703 and the cam shaft 707. Furthermore, when the cam shaft 707 rotates, the sliding action between the cam shaft 707 and the sliding groove rod 708 allows the square rod 709 and the first piston head 710 to move up and down in an orderly manner. 10 moves up and down inside the sampling cylinder 711, which can realize the function of venting and exhausting the sampling cylinder 711. With the help of the first one-way air inlet valve 712 and the first one-way air outlet valve 713, it can ensure that the air moves in one direction inside the sampling cylinder 711. Since the two cam shafts 707 are distributed one above the other on the front and rear end faces of the driven gear 703, when one sampling cylinder 711 is venting, the other sampling cylinder 711 is exhausting. By alternating the venting and exhausting functions of the two sampling cylinders 711, a basic guarantee can be provided for the continuous detection of air in the future. Furthermore, when the sampling cylinder 711 is being evacuated, outside air enters the sampling cylinder 711 through the air inlet 403, air inlet pipe 401, conduit and first one-way air inlet valve 712 for storage. With the help of the filter screen 404, dust in the air can be filtered to ensure the cleanliness of the air and provide a basic guarantee for subsequent monitoring of polluting gases in the air. The detection assembly 8 includes detection cylinders 801 symmetrically fixed on the partition 6. The internal volume of the detection cylinder 801 is smaller than that of the sampling cylinder 711, and the internal diameter of the detection cylinder 801 is equal to that of the sampling cylinder 711. A second one-way air inlet valve 802 is fixed on the detection cylinder 801, and the second one-way air inlet valve 802 is connected to a first one-way air outlet valve 713 via a conduit. A second one-way air outlet valve 803 is also fixed on the detection cylinder 801, and the second one-way air outlet valve 803 is connected to an exhaust pipe 5 via a conduit. An infrared light source 804 is nested inside the upper inner side of the detection cylinder 801, and a second piston 805 is slidably linked inside the detection cylinder 801. An infrared detector 806 is nested inside the second piston 805, and a round rod 807 that is slidably connected to the detection cylinder 801 is fixed to the lower end of the second piston 805. A spring 808 is fixed between the round rod 807 and the detection cylinder 801; a top rod 809 is fixed on the round rod 807, and the top rod 809 is located directly above the sliding groove rod 708; one end of the round rod 807 and the connecting rod 810 are fixed to each other, and the connecting rod 810 and the detection cylinder 801 are slidably connected, and the other end of the connecting rod 810 is fixed to the movable plate 811. At the same time, a guide groove 812 is provided on the movable plate 811, and the guide groove 812 is slidably connected to the sliding rod 813. The sliding rod 813 and the cross rod 814 are fixed to each other, and the cross rod 814 and the detection cylinder 801 are slidably connected. At the same time, the cross rod 814 is connected to the sealing plate 815. The sealing plate 815 is slidably connected inside the detection cylinder 801, and the sealing plate 815 cooperates with the through hole between the detection cylinder 801 and the second one-way vent valve 803 to achieve a sealing effect. During the operation of the device, such as Figures 1-8 As shown, when the motor 701 drives the driving gear 702 to rotate one revolution, since the gear ratio of the driving gear 702 to the driven gear 703 is 1:2, the driven gear 703 and the cam shaft 707 rotate exactly 180° at this time. Figure 5 For example, at this time, with the sliding action between the convex shaft 707 and the sliding rod 708, the sliding rod 708 connected to the front side and the left first piston head 710 can move upward, thereby causing the left first piston head 710 to move upward in the left sampling cylinder 711, realizing the exhaust function in the left sampling cylinder 711. At the same time, the sliding rod 708 connected to the rear side and the right first piston head 710 moves downward, thereby causing the right first piston head 710 to move downward in the right sampling cylinder 711, realizing the air extraction function in the right sampling cylinder 711. At this time, outside air enters the right sampling cylinder 711 for storage. Taking the right-side detection cylinder 801 and the right-side sampling cylinder 711 as examples, when the front sliding rod 708 moves upward to contact the top rod 809, the continued upward movement of the front sliding rod 708 can cause the top rod 809 to move upward synchronously under force, thereby driving the right-side round rod 807 and connecting rod 810 to move upward. The upward movement of the connecting rod 810 can drive the movable plate 811 to move upward. With the sliding action between the inclined groove on the guide groove 812 and the sliding rod 813, the cross rod 814 and the sealing plate 815 can move outward from the detection cylinder 801. When the sealing plate 815 separates from the through hole between the detection cylinder 801 and the second one-way vent valve 803, the right-side second piston 805 moves upward inside the right-side detection cylinder 801, which can then move the right-side detection cylinder 801. The gas inside the sampling cylinder 801 is discharged outward through the second one-way exhaust valve 803, the conduit, and the exhaust pipe 5. When the drive gear 702 rotates one revolution, the first piston head 710 on the right side moves to the bottom of the sampling cylinder 711, completing the sampling operation. The second piston 805 on the right side moves to the top of the sampling cylinder 801, completing the discharge of the gas inside the sampling cylinder 801. The drive gear 702 is then driven to rotate one revolution again by the motor 701. Based on the above principle, during the rotation of the driven gear 703 and the cam shaft 707, the first piston head 710 on the right side moves upward in the sampling cylinder 711, sending the air sample collected in the sampling cylinder 711 into the sampling cylinder through the first one-way exhaust valve 713, the conduit, and the second one-way intake valve 802. Inside 801, when the first piston head 710 on the right moves upward, the rear sliding rod 708 moves downward, and the front sliding rod 708 moves downward. Combined with the elastic action of the spring 808, this allows the right round rod 807, connecting rod 810, and movable plate 811 to move downward and reset. Since the internal diameter of the detection cylinder 801 is equal to the internal diameter of the sampling cylinder 711, air in the right sampling cylinder 711 can normally enter the right detection cylinder 801. At this time, the gas in the detection cylinder 801 is at normal pressure. When the front sliding rod 708 separates from the right top rod 809, the round rod 807, connecting rod 810, and movable plate 811 are fully reset. Combined with the sliding action between the inclined groove on the guide groove 812 and the sliding rod 813, this allows the sealing plate 81... 5. Reset to seal the through hole between the right-side detection cylinder 801 and the second one-way exhaust valve 803. At this time, the right-side second piston 805 is located at the lowest end of the right-side detection cylinder 801, meaning the internal space of the detection cylinder 801 is at its maximum. As the right-side first piston head 710 continues to move upward, the gas collected in the right-side sampling cylinder 711 can continue to enter the right-side detection cylinder 801, increasing the internal gas pressure. Since the sealing plate 815 seals the through hole between the right-side detection cylinder 801 and the second one-way exhaust valve 803, it ensures that the gas will not overflow when the internal gas pressure of the right-side detection cylinder 801 increases, until the right-side first piston head 710 moves to its highest point, at which point the internal gas pressure of the right-side detection cylinder 801 is at its maximum, i.e., the gas concentration is at its maximum.This technology better meets the needs of small-volume gas sampling. By compressing the gas to improve detection accuracy, and combining it with an infrared light source 804 that emits specific wavelengths of infrared light, which is then absorbed by polluting gases (such as nitric oxide), the infrared light is detected by an infrared detector 806 to determine the concentration of polluting gases and thus complete the air pollution detection function. Based on the above principle, by taking samples alternately through two sampling tubes 711 and by checking and detecting the sampled gas alternately through two detection tubes 801, continuous detection of air pollution can be achieved, better meeting actual detection needs.

[0020] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A high-accuracy air pollution detection device, comprising a detection host (1), wherein a storage battery (2) is installed inside the detection host (1), and a charging port (3) for charging the storage battery (2) is installed on the lower end face of the detection host (1), characterized in that: The upper surface of the detection host (1) is equipped with an air intake component (4) that can achieve dust filtration. The detection host (1) is also fixed with an exhaust pipe (5). The detection host (1) is fixed with a partition (6). The sampling component (7) achieves continuous air sampling and air compression through alternating motion. The sampling component (7) is installed inside the detection host (1). The detection component (8) is used to accurately detect compressed gas and can automatically remove the detected gas. The detection component (8) is installed on the partition (6).

2. The high-accuracy air pollution detection device according to claim 1, characterized in that: The air intake assembly (4) includes an air intake pipe (401) fixed on the upper surface of the detection host (1), and the air intake pipe (401) and the sampling head (402) are connected by a thread. The outer surface of the sampling head (402) is provided with an air intake port (403) at equal angles, and a filter screen (404) fixed inside the sampling head (402) is provided on the inner side of the air intake port (403).

3. The high-accuracy air pollution detection device according to claim 2, characterized in that: The sampling component (7) includes a motor (701) fixed inside the detection host (1), and the output end of the motor (701) is fixed with a drive gear (702), and the drive gear (702) meshes with the driven gear (703) to achieve transmission. At the same time, the gear ratio between the drive gear (702) and the driven gear (703) is 1:

2.

4. The high-accuracy air pollution detection device according to claim 3, characterized in that: The driven gear (703) is fixed with a limiting ring (704), and the driven gear (703), the limiting ring (704) and the positioning block (705) are slidably connected. There are three positioning blocks (705), and the positioning blocks (705) are fixed to the detection host (1) and the partition (6) through the support rod (706).

5. The high-accuracy air pollution detection device according to claim 4, characterized in that: Two convex shafts (707) are fixed on the driven gear (703), and the two convex shafts (707) are distributed one above the other on the front and rear end faces of the driven gear (703). The convex shafts (707) are slidably connected to the sliding rod (708), and the sliding rod (708) is fixed to the square rod (709). A first piston head (710) is fixed on the square rod (709), and the first piston head (710), the square rod (709) and the sampling cylinder (711) are slidably connected. The sampling cylinder (711) is fixed on the partition plate (6).

6. The high-accuracy air pollution detection device according to claim 5, characterized in that: The sampling cylinder (711) is fixed with a first one-way air inlet valve (712), and the first one-way air inlet valve (712) is connected to the air inlet pipe (401) through a conduit. The sampling cylinder (711) is also fixed with a first one-way air outlet valve (713).

7. The high-accuracy air pollution detection device according to claim 6, characterized in that: The detection assembly (8) includes detection cylinders (801) that are symmetrically fixed on the partition (6). The internal volume of the detection cylinder (801) is smaller than that of the sampling cylinder (711). The internal diameter of the detection cylinder (801) is equal to that of the sampling cylinder (711). A second one-way air inlet valve (802) is fixed on the detection cylinder (801). The second one-way air inlet valve (802) is connected to the first one-way air outlet valve (713) through a conduit. A second one-way air outlet valve (803) is also fixed on the detection cylinder (801). The second one-way air outlet valve (803) is connected to the exhaust pipe (5) through a conduit.

8. The high-accuracy air pollution detection device according to claim 7, characterized in that: An infrared light source (804) is nested inside the upper part of the inner side of the detection cylinder (801), and a second piston (805) is slidably linked inside the detection cylinder (801). An infrared detector (806) is nested inside the second piston (805). At the same time, a round rod (807) that is slidably connected to the detection cylinder (801) is fixed at the lower end of the second piston (805). A spring (808) is fixed between the round rod (807) and the detection cylinder (801).

9. The high-accuracy air pollution detection device according to claim 8, characterized in that: A top rod (809) is fixed on the round rod (807), and the top rod (809) is located directly above the sliding groove rod (708).

10. A high-accuracy air pollution detection device according to claim 9, characterized in that: One end of the round rod (807) is fixed to the connecting rod (810), and the connecting rod (810) is slidably connected to the detection cylinder (801). The other end of the connecting rod (810) is fixed to the movable plate (811). At the same time, a guide groove (812) is provided on the movable plate (811). The guide groove (812) is slidably connected to the slide rod (813), and the slide rod (813) is fixed to the cross rod (814). The cross rod (814) is slidably connected to the detection cylinder (801). At the same time, the cross rod (814) is connected to the sealing plate (815). The sealing plate (815) is slidably connected inside the detection cylinder (801), and the sealing plate (815) cooperates with the through hole between the detection cylinder (801) and the second one-way vent valve (803) to achieve a sealing effect.

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