A particle counter sensor with a protective gas sleeve

Abstract

The application discloses a particle counter sensor with a protective gas sleeve and relates to the technical field of particle detection. The application has the functions of air inlet pipe cleaning and air outlet pipe cleaning, and through adoption of the liftable blowing structure and the rotary blowing assembly, the inner wall of the pipeline can be fully cleaned when the particle counter is stopped, and when the application is used, the detection flow channel inner wall is smoothly transitioned, the airflow is smooth and stable, particle retention and airflow disturbance are effectively reduced, and the detection precision and use reliability of the particle counter sensor are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of particle detection technology, specifically to a particle counter sensor with a protective gas sleeve. Background Technology

[0002] In clean environment monitoring, high-end manufacturing (such as semiconductors and biomedicine), and scientific research, the concentration of airborne particles is a critical parameter that needs to be precisely and in real-time monitored. Optical particle counters (OPCs), especially laser dust particle counters, are currently the most widely used core detection devices. Their main working principle is as follows: a negative pressure generated by a built-in sampling pump forces the gas to be measured through the optical detection cavity of the sensor at a constant flow rate. As each particle in the gas passes through a focused laser beam, it generates scattered light pulses, the intensity of which is related to the particle size, thus enabling real-time statistics on particle size and quantity.

[0003] During normal operation of the particle counter, the sampling pump runs continuously to maintain a stable negative pressure. The gas to be detected enters the detection chamber along the inlet pipe and is discharged from the outlet pipe to the downstream pipe after detection. During this process, some dust, oil, and other contaminants in the gas inevitably adhere to the inner walls of the sensor's inlet and outlet pipes, forming contaminant residues. When the equipment stops, the sampling pump stops working, and the negative pressure it generates disappears instantly, disrupting the pressure balance between the outlet pipe, the downstream pipe, and the core optical detection chamber. The contaminants remaining on the inner wall of the pipe will detach under the combined effects of gravity and airflow backflow, flowing back into the optical detection chamber along the pipe, directly affecting the reliability of the sensor's detection data. Furthermore, the long-term accumulation of impurities adhering to the inner wall of the inlet pipe will gradually reduce the effective diameter of the pipe, disrupting the stability of the intake airflow and interfering with the movement of particles entering the detection chamber, indirectly causing measurement errors and affecting the accuracy of the detection results.

[0004] Based on this, this application proposes a particle counter sensor with a protective gas sleeve. Summary of the Invention

[0005] This invention provides a particle counter sensor with a protective gas sleeve, which solves the problems mentioned in the background art, such as the long-term accumulation of impurities adhering to the inner wall of the sensor's air inlet pipe gradually reducing the effective diameter of the pipe, disrupting the stability of the airflow, interfering with the movement of particles entering the detection chamber, indirectly causing measurement errors, and affecting the accuracy of the detection results; and the problem that impurities adhering to the inner wall of the air outlet pipe are prone to backflow, contaminating the sensor's detection chamber, and further reducing the detection accuracy and equipment reliability.

[0006] This invention provides the following technical solution: a particle counter sensor with a protective gas jacket, comprising a sensor body, an air inlet assembly at the air inlet end of the sensor body's detection chamber, and an air outlet assembly at the air outlet end of the sensor body's detection chamber; the air outlet assembly includes a conical tube connected to the air outlet end of the sensor body's detection chamber, a rotary purging assembly, and an air outlet pipe, the rotary purging assembly including a housing, a second clean gas inlet pipe on one side of the housing, an exhaust pipe on the other side of the housing, and a rotating body movably connected to the inner cavity of the housing. A hollow cavity is provided on one side of the body. Several first purge nozzles are evenly opened along the circumference of the cavity wall. The circumferential diameter of the several first purge nozzles is adapted to the inner diameter of the exhaust pipe. A through flow channel adapted to the inner cavity of the exhaust pipe is provided in the middle of the rotating body. When the through flow channel is aligned with the inner cavity of the exhaust pipe, the inner cavity of the conical tube, the through flow channel and the inner cavity of the exhaust pipe form the sensor exhaust flow channel. When the through flow channel is misaligned with the inner cavity of the exhaust pipe, the first purge nozzles are located on the side of the rotating body closer to the exhaust pipe, and the second clean gas inlet pipe and the exhaust pipe are connected through the through flow channel.

[0007] Preferably, the air intake assembly includes an air intake pipe and a first nozzle coaxially arranged with the outer ring of the air intake pipe outlet end. The air outlet end of the first nozzle is connected to the air intake end of the sensor body detection cavity. The air intake end of the first nozzle is provided with an air distribution ring. The air intake end of the air distribution ring is provided with a first clean air inlet pipe. The air intake end of the air intake pipe is provided with a liftable purging structure.

[0008] Preferably, the liftable purging structure includes a fixed sleeve connected to the air inlet pipe, a second nozzle is movably connected to the inner cavity of the fixed sleeve, the second nozzle is connected to the fixed sleeve through a lifting structure, and a second purging nozzle is provided on the side of the bottom of the second nozzle near the air outlet assembly.

[0009] Preferably, a sealing structure is provided inside the fixing sleeve, and the sealing structure is sleeved on the outer ring of the second nozzle. The sealing structure includes an upper airbag connected to the top of the inner cavity of the fixing sleeve and a lower airbag connected to the bottom of the fixing sleeve. The upper airbag and the lower airbag are connected by a support sleeve, and the inner cavities of the upper airbag, the support sleeve, and the lower airbag are in a connected state. A positioning ring is connected to the top of the inner cavity of the support sleeve, and a compression ring is placed on the top of the positioning ring. A lifting groove is provided on the second nozzle, and a lifting block adapted to the lifting groove is connected to the inner wall of the compression ring.

[0010] Preferably, the bottom of the second nozzle is an arc surface, and the inner diameter of the arc surface is the same as the inner diameter of the air intake pipe. When the lifting block is tightly fitted with the bottom of the lifting groove, the extrusion ring extrudes the upper airbag, and the lower airbag expands and seals the annular gap between the second nozzle and the air intake pipe. The arc surface is flush with the inner wall of the air intake pipe, together forming a smoothly transitioned air intake channel.

[0011] Preferably, the rotating body is movably connected to the housing via a rotating shaft, the housing is provided with a driving structure, the rotating shaft is driven to rotate via the driving structure, a third clean gas inlet pipe is movably connected to the top of the rotating shaft, the third clean gas inlet pipe is connected to the housing, the rotating shaft is a hollow structure, and the inner cavity of the third clean gas inlet pipe is connected to the hollow cavity via the inner cavity of the rotating shaft.

[0012] Preferably, the outlet end of the second clean gas inlet pipe is connected to a sealing block adapted to the through flow channel. The outer ring of the sealing block is uniformly provided with a plurality of third purge nozzles, and the circumferential diameter of the plurality of third purge nozzles is adapted to the inner diameter of the through flow channel.

[0013] Preferably, the top of the lower airbag is provided with a sleeve, and a lifting rod is movably connected inside the sleeve. An electromagnet is provided at the bottom of the positioning ring. When the electromagnet is energized, the electromagnet and the lifting rod are magnetically attracted to each other, and the lifting rod moves upward.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This particle counter sensor with a protective gas sleeve slows down contaminant accumulation and reduces maintenance frequency through proactive prevention and non-contact airflow cleaning. By coaxially arranging a first nozzle around the sensor's air inlet, an annular air curtain is formed. This annular air curtain envelops the gas to be measured, preventing particles in the gas from directly depositing into the sensor's detection chamber, thus ensuring the reliability of this application.

[0016] 2. The particle counter sensor with protective gas sleeve has inlet pipe cleaning and outlet pipe cleaning functions. By adopting a liftable purging structure and a rotary purging assembly, the inner wall of the pipeline is thoroughly cleaned when the particle counter is stopped. This ensures that the inner wall of the detection channel is smoothly transitioned and the airflow is smooth and stable during use, effectively reducing particle retention and airflow disturbance, and significantly improving the detection accuracy and reliability of the particle counter sensor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a particle counter sensor with a protective gas sleeve proposed in this invention;

[0018] Figure 2 The structure of this invention Figure 1 Rear view illustration;

[0019] Figure 3 This is a schematic cross-sectional view of the air intake assembly of the present invention;

[0020] Figure 4 The structure of this invention Figure 3 Explosion diagram;

[0021] Figure 5 This is a schematic diagram of the air outlet component of the present invention;

[0022] Figure 6 This is a cross-sectional schematic diagram of the rotary purging assembly of the present invention;

[0023] Figure 7 The structure of this invention Figure 6 Left side diagram.

[0024] In the diagram: 1. Sensor body; 2. Lifting block; 3. Lifting groove; 4. Air outlet pipe; 5. Air inlet pipe; 6. First nozzle; 7. Drive structure; 8. Housing; 9. Conical tube; 10. Exhaust pipe; 11. Second clean gas inlet pipe; 12. Third clean gas inlet pipe; 13. Third purge nozzle; 14. Through-flow channel; 15. Sealing block; 16. Rotating shaft; 17. Rotating body; 18. First purge nozzle; 19. Air distribution ring; 20. Fixing sleeve; 21. Second nozzle; 22. Lifting structure; 23. Second purge nozzle; 24. Lower airbag; 25. Support sleeve; 26. Upper airbag; 27. Squeezing ring; 28. Positioning ring; 29. ​​First clean air inlet pipe; 30. Lifting rod. Detailed Implementation

[0025] 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.

[0026] This invention provides one embodiment: Please refer to Figures 1-7 A particle counter sensor with a protective gas sleeve includes a sensor body 1. An air inlet assembly is provided at the air inlet end of the detection chamber of the sensor body 1. The air inlet assembly includes an air inlet pipe 5 and a first nozzle 6 coaxially arranged with the outer ring of the air outlet end of the air inlet pipe 5. An annular cavity is formed between the first nozzle 6 and the air inlet pipe 5. The air outlet end of the first nozzle 6 is connected to the air inlet end of the detection chamber of the sensor body 1. An air distribution ring 19 is provided at the air inlet end of the first nozzle 6, and a first clean air inlet pipe 29 is provided at the air inlet end of the air distribution ring 19. In use, clean air enters the inner cavity of the air distribution ring 19 through the first clean air inlet pipe 29. The clean air in the inner cavity of the air distribution ring 19 enters the annular cavity through the nozzles provided thereon. The annular air curtain ejected from the annular cavity can envelop the sampled gas ejected from the air inlet pipe 5, preventing particles in the sampled gas from directly depositing into the sensor detection chamber, thus ensuring the reliability of this application.

[0027] The intake end of the intake pipe 5 is provided with a liftable purging structure. The liftable purging structure includes a fixed sleeve 20 connected to the intake pipe 5. The inner cavity of the fixed sleeve 20 is movably connected to a second nozzle 21. The second nozzle 21 is connected to the fixed sleeve 20 through a lifting structure 22. In embodiment 1, the lifting structure 22 is an electric telescopic rod. The model and specifications can be set according to the requirements and are not limited here. The bottom end of the second nozzle 21 is provided with a second purging nozzle 23 on the side near the air outlet assembly. When the particle counter stops working, the air inlet pipe 5 needs to be purged. The controller of this application controls the lifting structure 22 to work. The lifting structure 22 drives the second nozzle 21 to move down until the second purging nozzle 23 moves to the middle of the inner cavity of the air inlet pipe 5. The clean gas purging the air inlet pipe 5 can enter the air inlet pipe 5 through the second nozzle 21 and the second purging nozzle 23 to purge the air inlet pipe 5. This prevents impurities adhering to the inner wall of the air inlet pipe 5 from gradually reducing the effective diameter of the pipe due to long-term accumulation, thus disrupting the stability of the airflow and ensuring the reliability of this application. Furthermore, when the air inlet pipe 5 is being purged, the first nozzle 6 continues to spray an annular air curtain to prevent the purging airflow from affecting the sensor detection cavity.

[0028] A sealing structure is provided inside the fixed sleeve 20, and the sealing structure is sleeved on the outer ring of the second nozzle 21. The sealing structure includes an upper airbag 26 connected to the top of the inner cavity of the fixed sleeve 20 and a lower airbag 24 connected to the bottom of the fixed sleeve 20. The upper airbag 26 and the lower airbag 24 are connected by a support sleeve 25, and the inner cavities of the upper airbag 26, the support sleeve 25, and the lower airbag 24 are in a state of communication. A positioning ring 28 is connected to the top of the inner cavity of the support sleeve 25, and a compression ring 2 is placed on the top of the positioning ring 28. 7. A lifting groove 3 is provided on the second nozzle 21. A lifting block 2 that is adapted to the lifting groove 3 is connected to the inner wall of the extrusion ring 27. When the lifting block 2 contacts the bottom of the inner cavity of the lifting groove 3, the second nozzle 21 moves upward and can drive the extrusion ring 27 to move upward. When the extrusion ring 27 contacts the bottom of the upper airbag 26, the extrusion ring 27 continues to move upward and can extrude the upper airbag 26. Excess gas in the upper airbag 26 can enter the lower airbag 24 through the inner cavity of the support sleeve 25, causing the lower airbag 24 to expand in volume.

[0029] The bottom of the second nozzle 21 is an arc surface, and the inner diameter of the arc surface is the same as the inner diameter of the air inlet pipe 5. When the bottom of the second nozzle 21 is flush with the inner wall of the air inlet pipe 5, the lifting block 2 and the bottom of the inner cavity of the lifting groove 3 are tightly fitted. The squeezing ring 27 squeezes the upper air bag 26, causing the lower air bag 24 to expand and seal the annular gap between the second nozzle 21 and the air inlet pipe 5. At this time, the arc surface and the inner wall of the air inlet pipe 5 together form a smooth transition airflow channel, which effectively avoids eddies or particulate matter deposition caused by steps or gaps, and facilitates the flow of sampling gas.

[0030] A sleeve is provided at the top of the lower airbag 24, and the inner cavity of the sleeve is connected to the inner cavity of the lower airbag 24. The sleeve is connected to the inner wall of the fixed sleeve 20. A lifting rod 30 is movably connected inside the sleeve. Under the action of gravity, the lifting rod 30 is in a tight fit with the bottom of the inner cavity of the sleeve. When the lower airbag 24 expands, the lifting rod 30 seals the air inlet at the bottom of the inner cavity of the sleeve. An electromagnet is provided at the bottom of the positioning ring 28. When the electromagnet is energized, the electromagnet and the lifting rod 30 are magnetically attracted to each other, and the lifting rod 30 moves upward. When the lifting rod 30 stops moving, excess gas in the lower airbag 24 can enter the inner cavity of the sleeve, and the lower airbag 24 can return to its original shape, releasing the seal on the second nozzle 21, which facilitates the downward movement of the second nozzle 21 under the action of the lifting structure 22. The model and specifications of the electromagnet, and the material and specifications of the lifting rod 30 can be set according to requirements and are not limited here.

[0031] As described above, this application, during use, delays contaminant accumulation and reduces maintenance frequency through proactive prevention and non-contact airflow cleaning. Specifically, a first nozzle 6 is coaxially arranged around the sensor's air inlet to form an annular air curtain. This annular air curtain envelops the gas to be measured, preventing particles in the gas from directly depositing into the sensor's detection chamber, thus ensuring the reliability of this application. A liftable purging structure is used to purge the air inlet pipe 5, preventing impurities adhering to the inner wall of the air inlet pipe 5 from gradually reducing the effective pipe diameter and disrupting the stability of the airflow, thereby ensuring the reliability of this application.

[0032] An air outlet assembly is provided at the air outlet end of the detection chamber of the sensor body 1. The air outlet assembly includes a conical tube 9, a rotary purging assembly, and an air outlet pipe 4 connected to the air outlet end of the detection chamber of the sensor body 1. The rotary purging assembly includes a housing 8. A second clean gas inlet pipe 11 is provided on one side of the housing 8, and an exhaust pipe 10 is provided on the other side of the housing 8. A rotating body 17 is movably connected to the inner cavity of the housing 8. The rotating body 17 is movably connected to the housing 8 through a rotating shaft 16. A driving structure 7 is provided on the housing 8, and the rotating shaft 16 is driven to rotate through the driving structure 7. A through flow channel adapted to the inner cavity of the air outlet pipe 4 is provided in the middle of the rotating body 17. 14. When the drive structure 7 drives the rotating shaft 16 to rotate, the rotating shaft 16 drives the rotating body 17 to rotate. When the through-flow channel 14 is aligned with the inner cavity of the outlet pipe 4, the inner cavity of the conical tube 9, the through-flow channel 14, and the inner cavity of the outlet pipe 4 form a stable sensor outlet flow channel. The rotating body 17 and the outlet pipe 4, as well as the conical tube 9, are sealed by a sealing ring. The material of the sealing ring can be set according to requirements and is not limited here. When the rotating body 17 blocks the conical tube 9 and the outlet pipe 4, the through-flow channel 14 and the outlet pipe 4 are in a staggered state. The second clean gas inlet pipe 11 and the exhaust pipe 10 are connected through the through-flow channel 14. The outlet end of the second clean gas inlet pipe 11 is connected to a sealing block 15 that is adapted to the through-flow channel 14. The outer ring of the sealing block 15 is evenly provided with a number of third purge nozzles 13, and the circumferential diameter of the number of third purge nozzles 13 is adapted to the inner diameter of the through-flow channel 14. The clean gas entering the second clean gas inlet pipe 11 can be sprayed onto the inner wall of the through flow channel 14 through the third purging nozzle 13, thereby purging the inner wall of the through flow channel 14. The fluid containing impurities generated during the purging process is sprayed out through the exhaust pipe 10.

[0033] A hollow cavity is provided on one side of the rotating body 17. Several first purge nozzles 18 are evenly distributed circumferentially on the cavity wall of the hollow cavity. The circumferential diameter of the first purge nozzles 18 is adapted to the inner diameter of the outlet pipe 4. When the rotating body 17 blocks the air inlet of the outlet pipe 4, the through-flow channel 14 and the inner cavity of the outlet pipe 4 are misaligned. The first purge nozzles 18 are located on the side of the rotating body 17 closest to the outlet pipe 4. A third clean gas inlet pipe 12 is movably connected to the top of the rotating shaft 16. The third clean gas inlet pipe 12 is connected to the shell 8. The rotating shaft 16 has a hollow structure, and the inner cavity of the third clean gas inlet pipe 12 is connected to the hollow cavity through the inner cavity of the rotating shaft 16. Clean gas can be sprayed onto the inner wall of the outlet pipe 4 through the third clean gas inlet pipe 12, the hollow cavity, and the first purge nozzles 18, thereby purging the outlet pipe 4 and preventing impurities from flowing back.

[0034] As described above, this application, by employing a liftable purging structure and a rotary purging assembly, achieves comprehensive cleaning of the inner wall of the pipeline when the particle counter is stopped. It also ensures that during use, the inner wall of the detection channel is smoothly transitioned and the airflow is smooth and stable, effectively reducing particle retention and airflow disturbance, and significantly improving the detection accuracy and reliability of the particle counter sensor.

[0035] In summary: When using this particle counter sensor with a protective gas sleeve, the gas to be measured enters the sensor's detection chamber through the inlet pipe 5. During the intake process, clean air enters the inner cavity of the air distribution ring 19 through the first clean air inlet pipe 29. The clean air in the inner cavity of the air distribution ring 19 enters the annular cavity through the nozzles set on it. The annular air curtain ejected from the annular cavity can wrap the gas to be sampled ejected from the inlet pipe 5, preventing particles in the gas to be measured from directly depositing into the sensor's detection chamber, thus ensuring the reliability of this application. When the gas to be measured passes through the sensor's optical detection chamber, as each particle in the gas passes through the focused laser beam, it generates a scattered light pulse. The intensity of the pulse is related to the particle size, thereby enabling real-time statistics of particle size and quantity. The measured gas is discharged through the sensor's outlet air channel formed by the conical pipe 9, the through-flow channel 14, and the outlet pipe 4. When the particle counter stops working, the controller controls the electromagnet to be energized. The magnetic attraction between the electromagnet and the lifting rod 30 causes the lifting rod 30 to move upward, increasing the effective volume inside the sleeve. Excess gas in the lower airbag 24 enters the sleeve, reducing the volume of the lower airbag 24. When the lifting rod 30 stops moving, the lower airbag 24 releases the seal on the second nozzle 21. The controller controls the lifting structure 22 to work, using the lifting structure 22 to drive the second nozzle 21 downward. The second nozzle 21 releases the pressure on the compression ring 27. Under the action of gravity, the compression ring 27 can move downward. When the compression ring 27 contacts the top of the positioning ring 28, the electromagnet is de-energized. Under the action of gravity, the lifting rod 30 moves downward, squeezing the excess gas in the sleeve through the lower airbag 24 and the support sleeve 25 into the upper airbag 26. Until the second purge nozzle 23 on the second nozzle 21 moves to the middle of the inner cavity of the intake pipe 5, the clean gas that purges the intake pipe 5 can enter the intake pipe 5 through the second nozzle 21 and the second purge nozzle 23, thus purging the intake pipe 5. After the intake pipe 5 is purged, the clean gas injection into the intake assembly stops, and the drive structure 7 drives the rotating body 17 to rotate, so that the through flow channel 14 is aligned with the second clean gas inlet pipe 11 and the exhaust pipe 10, and the clean gas is injected into the exhaust assembly. The clean gas in the second clean gas inlet pipe 11 can be sprayed onto the inner wall of the through flow channel 14 through the third purge nozzle 13, thus purging the inner wall of the through flow channel 14. The clean gas can be sprayed onto the inner wall of the exhaust pipe 4 through the third clean gas inlet pipe 12, the hollow cavity, and the first purge nozzle 18, thus purging the exhaust pipe 4 and preventing impurities from flowing back.

[0036] All standard parts used in this invention are commercially available products, and irregularly shaped parts can be customized according to the specifications and drawings. All specific connection methods of the structures adopt well-known and mature technologies in the art, such as bolt connections. The machinery, parts, and equipment used are all existing models under current technical conditions. The material, size, and specifications of each component can be selected according to actual needs, and this specification does not impose any limitations on this. Content not described in detail in this specification belongs to prior art known to those skilled in the art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A particle counter sensor with a protective gas jacket, comprising a sensor body (1), characterized in that: An air inlet assembly is provided at the air inlet end of the detection chamber of the sensor body (1), and an air outlet assembly is provided at the air outlet end of the detection chamber of the sensor body (1). The air outlet assembly includes a conical tube (9), a rotary purging assembly, and an air outlet pipe (4) connected to the air outlet end of the detection chamber of the sensor body (1). The rotary purging assembly includes a housing (8). A second clean gas inlet pipe (11) is provided on one side of the housing (8), and an exhaust pipe (10) is provided on the other side of the housing (8). A rotating body (17) is movably connected to the inner cavity of the housing (8). A hollow cavity is provided on one side of the rotating body (17), and a plurality of first purging gas inlets are evenly opened along the circumferential direction on the cavity wall of the hollow cavity. The circumference diameter of the first purge nozzles (18) is adapted to the inner diameter of the exhaust pipe (4); the middle part of the rotating body (17) is provided with a through flow channel (14) adapted to the inner cavity of the exhaust pipe (4). When the through flow channel (14) is aligned with the inner cavity of the exhaust pipe (4), the inner cavity of the tapered tube (9), the through flow channel (14) and the inner cavity of the exhaust pipe (4) form a sensor exhaust flow channel. When the through flow channel (14) is misaligned with the inner cavity of the exhaust pipe (4), the first purge nozzles (18) are located on the side of the rotating body (17) close to the exhaust pipe (4), and the second clean gas inlet pipe (11) and the exhaust pipe (10) are connected through the through flow channel (14).

2. A particle counter sensor with a protective gas sleeve according to claim 1, characterized in that: The air intake assembly includes an air intake pipe (5) and a first nozzle (6) coaxially arranged with the outer ring of the air outlet end of the air intake pipe (5). The air outlet end of the first nozzle (6) is connected to the air intake end of the detection chamber of the sensor body (1). The air intake end of the first nozzle (6) is provided with a uniform air ring (19). The air intake end of the uniform air ring (19) is provided with a first clean air inlet pipe (29). The air intake end of the air intake pipe (5) is provided with a liftable purging structure.

3. A particle counter sensor with a protective gas sleeve according to claim 2, characterized in that: The liftable purging structure includes a fixed sleeve (20) connected to the air inlet pipe (5). The inner cavity of the fixed sleeve (20) is movably connected to a second nozzle (21). The second nozzle (21) is connected to the fixed sleeve (20) through a lifting structure (22). A second purging nozzle (23) is provided on the side of the bottom end of the second nozzle (21) near the air outlet assembly.

4. A particle counter sensor with a protective gas sleeve according to claim 3, characterized in that: The fixed sleeve (20) is provided with a sealing structure, which is sleeved on the outer ring of the second nozzle (21). The sealing structure includes an upper airbag (26) connected to the top of the inner cavity of the fixed sleeve (20) and a lower airbag (24) connected to the bottom of the fixed sleeve (20). The upper airbag (26) and the lower airbag (24) are connected by a support sleeve (25), and the inner cavities of the upper airbag (26), the support sleeve (25) and the lower airbag (24) are in a connected state. A positioning ring (28) is connected to the top of the inner cavity of the support sleeve (25), and a compression ring (27) is placed on the top of the positioning ring (28). A lifting groove (3) is provided on the second nozzle (21), and a lifting block (2) adapted to the lifting groove (3) is connected to the inner wall of the compression ring (27).

5. A particle counter sensor with a protective gas sleeve according to claim 4, characterized in that: The bottom of the second nozzle (21) is an arc surface, and the inner diameter of the arc surface is the same as the inner diameter of the air intake pipe (5). When the lifting block (2) is tightly attached to the bottom of the inner cavity of the lifting groove (3), the extrusion ring (27) extrudes the upper airbag (26), and the lower airbag (24) expands and seals the annular gap between the second nozzle (21) and the air intake pipe (5). The arc surface is flush with the inner wall of the air intake pipe (5) and together they form a smooth transition air intake channel.

6. A particle counter sensor with a protective gas sleeve according to claim 1, characterized in that: The rotating body (17) is movably connected to the housing (8) via a rotating shaft (16). A driving structure (7) is provided on the housing (8). The rotating shaft (16) is driven to rotate via the driving structure (7). A third clean gas inlet pipe (12) is movably connected to the top of the rotating shaft (16). The third clean gas inlet pipe (12) is connected to the housing (8). The rotating shaft (16) is a hollow structure. The inner cavity of the third clean gas inlet pipe (12) is connected to the hollow cavity via the inner cavity of the rotating shaft (16).

7. A particle counter sensor with a protective gas sleeve according to claim 1, characterized in that: The outlet end of the second clean gas inlet pipe (11) is connected to a sealing block (15) that is compatible with the through flow channel (14). The outer ring of the sealing block (15) is uniformly provided with a number of third purge nozzles (13), and the circumferential diameter of the number of third purge nozzles (13) is compatible with the inner diameter of the through flow channel (14).

8. A particle counter sensor with a protective gas sleeve according to claim 4, characterized in that: The top of the lower airbag (24) is provided with a sleeve, and a lifting rod (30) is movably connected inside the sleeve. An electromagnet is provided at the bottom of the positioning ring (28). When the electromagnet is energized, the electromagnet and the lifting rod (30) are magnetically attracted to each other, and the lifting rod (30) moves upward.

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