A gas-liquid separator for air pollution detection

Abstract

This invention discloses a gas-liquid separator for air pollution detection, comprising a separation cylinder, an end cap, a deflector plate, and a filter cylinder. A secondary separation mechanism is installed inside the filter cylinder, and a cleaning mechanism is installed at the outer end of the filter cylinder. A motor connected to the secondary separation mechanism is installed at the upper end of the end cap. An air inlet and an exhaust outlet are respectively located on the left and right sides of the end cap. The deflector plate and the filter cylinder are detachably installed at the lower end of the end cap, and the end cap is detachably installed at the upper end of the separation cylinder. A drain outlet is located at the bottom of the separation cylinder. The secondary separation mechanism includes a rotating shaft, a centrifugal impeller, and a wiping roller. This invention has the advantages of good separation effect and easy maintenance, solving the problems of low separation efficiency in existing gas-liquid separators, which affects the service life and detection efficiency of the equipment, and the easy clogging of the gas-liquid separator, requiring downtime for maintenance, which further affects gas detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of gas-liquid separators, in particular to a gas-liquid separator for air pollution detection. Background Art

[0002] Air pollution detection is an important part of environmental monitoring, which is used to assess air quality, monitor pollutant emissions, and study atmospheric chemical processes. When conducting air pollution detection, the collected samples often contain a lot of water, especially in high humidity environments. This water not only affects the accuracy of subsequent analysis, but also causes damage to the sampling equipment, such as causing sensor failure or circuit short circuit.

[0003] Traditional gas-liquid separators usually rely on gravity sedimentation or simple filtration methods, which leads to low separation efficiency and cannot effectively remove droplets and moisture in the airflow. Even after initial separation, the humidity in the gas is still high, which may affect the accuracy and life of subsequent analytical instruments. Repeated separations are often required. After most separators have been used for a period of time, the filter elements will be blocked by droplets or particulate matter, requiring frequent manual cleaning or replacement, which increases maintenance costs and operational complexity. Existing gas-liquid separators may experience a decrease in separation efficiency when dealing with airflows with high flow rates or pressure fluctuations, especially when the airflow pressure is low, the separation effect is greatly reduced. Therefore, a gas-liquid separator for atmospheric pollution detection is needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a gas-liquid separator for atmospheric pollution detection, which has the advantages of good separation effect and easy maintenance, and solves the problems in the prior art that the gas-liquid separator has low separation efficiency, affects the service life of the detection equipment and affects the detection efficiency, and the gas-liquid separator is easily blocked and requires shutdown for maintenance, which further affects the gas detection efficiency.

[0005] To achieve the above object, the present invention provides the following technical solution: a gas-liquid separator for air pollution detection, comprising a separation cylinder, an end cover, a return plate and a filter cylinder, wherein a secondary separation mechanism is arranged in the filter cylinder, a cleaning mechanism is arranged at the outer end of the filter cylinder, and a motor is arranged at the upper end of the end cover in transmission connection with the secondary separation mechanism;

[0006] The left and right sides of the end cover are respectively provided with an air inlet and an air outlet, the return plate and the filter cartridge are detachably mounted on the lower end of the end cover, the end cover is detachably mounted on the upper end of the separation cartridge, and a drain port is provided at the bottom of the separation cartridge;

[0007] The secondary separation mechanism includes a rotating shaft, a centrifugal impeller and a wiping roller. A water collecting cylinder cooperating with the secondary separation mechanism is arranged on the top of the side of the filter cylinder. The secondary separation mechanism is installed in the filter cylinder and is rotatably connected to the end cover.

[0008] The cleaning mechanism comprises a transmission plate and a cleaning brush. The cleaning mechanism is installed at the bottom of the filter cylinder and is fixedly connected to the secondary separation mechanism.

[0009] As a preferred gas-liquid separator for air pollution detection of the present invention, the centrifugal impeller includes a shaft sleeve, a water suction blade and a stabilizing ring, the water suction blade is fixedly mounted on the shaft sleeve, the shaft sleeve is fixedly mounted on the rotating shaft, the water suction blade is an arc-shaped structure, the stabilizing ring is fixedly mounted on the outside of the water suction blade, the centrifugal impeller is located on the inside of the water collecting cylinder, and the diameter of the centrifugal impeller is larger than the diameter of the filter cylinder.

[0010] As a preferred gas-liquid separator for air pollution detection of the present invention, the water absorption blade is made of porous ceramics, the side of the stabilizing ring is provided with a drainage hole, the upper end surface of the drainage hole is flush with the lower end surface of the water absorption blade, and the inner end surface of the stabilizing ring is provided with a guide plate.

[0011] As a preferred gas-liquid separator for air pollution detection of the present invention, a water storage tank is arranged on the upper end surface of the bottom of the water collecting cylinder, the water storage tank is a circular ring structure, a reflux pipe is arranged at the bottom of the water storage tank, and a one-way valve is arranged in the reflux pipe.

[0012] As a preferred gas-liquid separator for air pollution detection of the present invention, a fixedly connected reciprocating screw is provided at the bottom of the rotating shaft, a slider which cooperates with the thread of the reciprocating screw is provided at the center of the wiping roller, absorbent cotton which fits with the inner end surface of the filter cylinder is provided on the wiping roller, a guide groove is provided on the side of the slider, and a guide strip which slides with the guide groove is provided on the inner end surface of the filter cylinder.

[0013] As a preferred gas-liquid separator for air pollution detection of the present invention, the side end face and the bottom of the filter cartridge are provided with honeycomb-shaped small holes, and the upper end face of the bottom of the filter cartridge is provided with a drainage boss corresponding to the shape of the absorbent cotton, and the surface of the drainage boss is a mesh structure.

[0014] As a preferred gas-liquid separator for air pollution detection of the present invention, the bottom of the reciprocating screw passes through the filter cartridge and is connected to the transmission plate, the cleaning brush is movably mounted on the upper end surface of the transmission plate, and the surface of the cleaning brush is provided with bristles that fit the surface of the filter cartridge.

[0015] As a preferred gas-liquid separator for air pollution detection of the present invention, a spring is provided at the bottom of the cleaning brush, the cleaning brush is elastically connected to the transmission plate through the spring, the top of the cleaning brush is fitted with the bottom lower end surface of the water collecting cylinder, and the lower end surface of the water collecting cylinder is a wavy structure.

[0016] As a preferred gas-liquid separator for air pollution detection of the present invention, the outer end surface of the return plate is provided with a spiral guide plate, and the spiral guide plate is in contact with the inner end surface of the separation cylinder.

[0017] As a preferred gas-liquid separator for air pollution detection of the present invention, a one-way bearing is arranged between the motor and the rotating shaft, and the motor and the rotating shaft are rotatably connected via the one-way bearing.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention utilizes centrifugal force to initially separate gas and liquid through the rotation of the centrifugal impeller, and then further separates water vapor in the gas through a secondary separation mechanism, thereby significantly improving separation efficiency and accuracy. The use of water-absorbing blades can not only absorb moisture in the air, but also throw out the moisture under high-speed rotation. The design of the guide plate and the dehydration hole improves the convenience of dehydration by the water-absorbing blades and greatly reduces the humidity of the gas after separation. The design of the water collecting cylinder, in conjunction with the water storage tank and the reflux pipe, ensures that the separated moisture can be discharged in a timely and orderly manner, avoids the re-mixing of water droplets into the airflow, and improves the stability and reliability of the overall system.

[0020] 2. The present invention realizes continuous wiping of the inner wall of the filter cartridge through the combination of the wiping roller and the absorbent cotton, combined with the movement of the reciprocating screw rod, thereby effectively removing attached water droplets and preventing water droplets from flowing upward under the action of airflow, thereby maintaining the cleanliness and efficiency of the filter cartridge. The fit of the cleaning brush to the surface of the filter cartridge and the up and down swinging guided by the wavy structure of the lower end face of the water collecting cartridge effectively remove particulate impurities on the surface of the filter cartridge and improve the air permeability and service life of the filter cartridge. The one-way bearing design between the motor and the rotating shaft enables the centrifugal impeller to rotate autonomously under the action of wind force and also obtain power assistance from the motor when the airflow pressure is insufficient, thereby ensuring the stable operation and separation effect of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 3 It is a front cross-sectional view of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle;

[0026] Figure 6 For the present invention Figure 3 Enlarged view of point C in the middle;

[0027] Figure 7 It is a cross-sectional view of the matching state of the filter cartridge, the secondary separation mechanism and the cleaning mechanism of the present invention;

[0028] Figure 8 It is a schematic diagram of the cooperation state of the secondary separation mechanism and the cleaning mechanism of the present invention;

[0029] Fig. 9 For the present invention Figure 8 Enlarged view of point D in the middle;

[0030] Fig.10 It is a schematic diagram of the structure of the wiping roller of the present invention;

[0031] Fig.11 It is a schematic diagram of the structure of the return plate of the present invention.

[0032] In the figure: 1. end cover; 101. air inlet; 102. exhaust port; 103. drain port; 2. separation cylinder; 3. return plate; 301. spiral guide plate; 4. filter cylinder; 401. water collecting cylinder; 402. water storage tank; 403. return pipe; 4031. one-way valve; 404. drain boss; 405. guide strip; 5. secondary separation mechanism; 501. rotating shaft; 502. centrifugal impeller; 5021. bushing; 5022. water-absorbing blade; 5023. stabilizing ring; 5024. drain hole; 5025. guide plate; 503. wiping roller; 5031. slider; 5032. guide groove; 5033. water-absorbing cotton; 504. reciprocating screw; 6. cleaning mechanism; 601. transmission plate; 602. cleaning brush; 603. bristles; 604. spring; 7. motor. DETAILED DESCRIPTION

[0033] Example 1

[0034] See also Figure 1-Figure 11 A gas-liquid separator for air pollution detection includes a separation cylinder 2, an end cover 1, a return plate 3 and a filter cylinder 4, a secondary separation mechanism 5 is arranged in the filter cylinder 4, a cleaning mechanism 6 is arranged at the outer end of the filter cylinder 4, and a motor 7 drivingly connected to the secondary separation mechanism 5 is arranged at the upper end of the end cover 1;

[0035] The left and right sides of the end cover 1 are respectively provided with an air inlet 101 and an air outlet 102, the return plate 3 and the filter cartridge 4 are detachably mounted on the lower end of the end cover 1, the end cover 1 is detachably mounted on the upper end of the separation cartridge 2, and a drain port 103 is provided at the bottom of the separation cartridge 2;

[0036] The secondary separation mechanism 5 includes a rotating shaft 501, a centrifugal impeller 502 and a wiping roller 503. A water collecting cylinder 401 cooperating with the secondary separation mechanism 5 is arranged on the top of the side of the filter cartridge 4. The secondary separation mechanism 5 is installed in the filter cartridge 4 and is rotatably connected to the end cover 1.

[0037] The cleaning mechanism 6 includes a transmission plate 601 and a cleaning brush 602 . The cleaning mechanism 6 is installed at the bottom of the filter cartridge 4 and fixedly connected to the secondary separation mechanism 5 .

[0038] Furthermore, the centrifugal impeller 502 includes a shaft sleeve 5021, a water-absorbing blade 5022 and a stabilizing ring 5023. The water-absorbing blade 5022 is fixedly mounted on the shaft sleeve 5021, the shaft sleeve 5021 is fixedly mounted on the rotating shaft 501, the water-absorbing blade 5022 is an arc-shaped structure, the stabilizing ring 5023 is fixedly mounted on the outer side of the water-absorbing blade 5022, the centrifugal impeller 502 is located on the inner side of the water collecting cylinder 401, and the diameter of the centrifugal impeller 502 is larger than the diameter of the filter cylinder 4.

[0039] When the airflow passes through the centrifugal impeller 502, it drives the centrifugal impeller 502 to rotate, and the centrifugal impeller 502 drives the rotating shaft 501 to rotate, which transmits the bottom wiping roller 503. The water absorption blades 5022 on the centrifugal impeller 502 can absorb moisture in the air, further dehumidify the airflow, and reduce the humidity of the separated gas.

[0040] Furthermore, the water absorbing blade 5022 is made of porous ceramics, a drainage hole 5024 is provided on the side of the stabilizing ring 5023 , the upper end surface of the drainage hole 5024 is flush with the lower end surface of the water absorbing blade 5022 , and a guide plate 5025 is provided on the inner end surface of the stabilizing ring 5023 .

[0041] The porous ceramic has good water absorption and energy absorption properties. Under the action of centrifugal force, water can be thrown out from the porous structure, thereby achieving dehydration of the water absorption blades 5022. When the water absorption blades 5022 on the centrifugal impeller 502 are saturated with water, the internal water droplets are thrown out horizontally under the high-speed rotation of the centrifugal impeller 502. Under the guidance of the guide plate 5025, the water droplets are discharged through the drainage holes 5024, thrown to the side wall of the water collecting barrel 401, and discharged from the reflux pipe 403 at the bottom of the water collecting barrel 401.

[0042] Furthermore, a water storage tank 402 is provided on the upper end surface of the bottom of the water collecting cylinder 401 . The water storage tank 402 is a circular ring structure. A return pipe 403 is provided at the bottom of the water storage tank 402 . A one-way valve 4031 is provided in the return pipe 403 .

[0043] The annular water storage tank 402 enables the water collecting cylinder 401 to have a certain water storage capacity, and the collected water can flow back to the bottom of the separation cylinder 2 through the reflux pipe 403, and the separated water droplets are removed in time to prevent the water in the water collecting tank from overflowing into the filter cylinder 4 and being rushed to the exhaust port 102 by the air flow again. The one-way valve 4031 is designed to prevent the water in the reflux pipe 403 from flowing back.

[0044] Furthermore, a reciprocating screw 504 is fixedly connected to the bottom of the rotating shaft 501, a slider 5031 threadably matched with the reciprocating screw 504 is provided at the center of the wiping roller 503, an absorbent cotton 5033 fitted with the inner end surface of the filter cartridge 4 is provided on the wiping roller 503, a guide groove 5032 is provided on the side of the slider 5031, and a guide bar 405 slidably matched with the guide groove 5032 is provided on the inner end surface of the filter cartridge 4.

[0045] When the rotating shaft 501 drives the reciprocating screw rod 504 to rotate, the slider 5031 drives the absorbent cotton 5033 to slide back and forth up and down along the guide strip 405, so that the wiping roller 503 wipes the inner wall of the filter cylinder 4 back and forth to wipe off the water droplets attached to the surface, thereby preventing the water droplets from flowing upward under the action of the airflow.

[0046] Furthermore, the side end surface and the bottom of the filter cartridge 4 are provided with honeycomb-shaped small holes, and the bottom upper end surface of the filter cartridge 4 is provided with a drainage boss 404 corresponding to the shape of the absorbent cotton 5033, and the surface of the drainage boss 404 is a mesh structure.

[0047] When the wiping roller 503 moves to the bottom, the drainage boss 404 squeezes the absorbent cotton 5033 on the surface of the wiping roller 503, thereby squeezing out the water droplets inside it. The squeezed water passes through the drainage boss 404 and the filter cartridge 4 and flows downward to the drain port 103, thereby dehydrating the wiping roller 503 and maintaining a high water absorption performance.

[0048] Furthermore, the bottom of the reciprocating screw rod 504 passes through the filter cartridge 4 and is fixedly connected to the transmission plate 601. The bottom of the reciprocating screw rod 504 is rotatably connected to the filter cartridge 4. The cleaning brush 602 is movably mounted on the upper end surface of the transmission plate 601. The surface of the cleaning brush 602 is provided with bristles 603 that fit the surface of the filter cartridge 4.

[0049] When the reciprocating screw 504 rotates, it drives the bottom transmission plate 601 to rotate, so that the cleaning brush 602 cleans the surface of the filter cartridge 4 , sweeps off the granular impurities blocking the surface of the filter cartridge 4 , and improves the air permeability of the filter cartridge 4 .

[0050] Furthermore, a spring 604 is provided at the bottom of the cleaning brush 602, and the cleaning brush 602 is elastically connected to the transmission plate 601 through the spring 604. The top of the cleaning brush 602 fits against the bottom lower end surface of the water collecting cylinder 401, and the lower end surface of the water collecting cylinder 401 is a wavy structure.

[0051] When the transmission plate 601 rotates, the cleaning brush 602 is guided by the lower end surface of the water collecting cylinder 401 and swings up and down in a small range, thereby further improving the sweeping effect on the surface of the filter cylinder 4.

[0052] Furthermore, a spiral guide plate 301 is provided on the outer end surface of the return plate 3 , and the spiral guide plate 301 is in contact with the inner end surface of the separation cylinder 2 .

[0053] When the mixed airflow enters the gas-liquid separator from the air inlet 101, it is guided by the spiral guide plate 301 to form a spiral airflow. The gas and liquid are separated under the action of centrifugal force, and the heavier liquid is thrown onto the inner wall of the filter cylinder 4 and flows along the inner wall to the drain port 103.

[0054] Furthermore, a one-way bearing is provided between the motor 7 and the rotating shaft 501 , and the motor 7 and the rotating shaft 501 are rotationally connected via the one-way bearing.

[0055] The centrifugal impeller 502 can drive the rotating shaft 501 to rotate under the action of wind, completing a series of gas-liquid separation and self-cleaning actions. When the airflow pressure is insufficient, the motor 7 can provide assistance to enhance the gas-liquid separation and self-cleaning effects.

[0056] When the gas-liquid separator is in use, the air inlet 101 and the exhaust port 102 are connected to the sample gas source and subsequent processing equipment to ensure that the connection is sealed to avoid gas leakage. The sample gas source is pumped into the separation cylinder 2 through an external air pump. When the gas containing droplets enters the separator through the air inlet 101, the gas first passes through the guidance of the return plate 3 to form a spiral flow. This process increases the contact area between the gas and the inner wall of the separator, which is conducive to the initial droplet collision and separation. The airflow then enters the interior of the filter cylinder 4 with a centrifugal impeller 502. The centrifugal impeller The water absorbing blades 5022 on the centrifugal impeller 502 further absorb the moisture in the airflow, perform secondary dehumidification, and reduce the humidity of the gas. The centrifugal impeller 502 rotates under the drive of the airflow to generate centrifugal force. The internal droplets of the water absorbing blades 5022 after saturation are thrown to the inner wall of the water collecting cylinder 401 due to the centrifugal force. The drainage holes 5024 on the stabilizing ring 5023 inside the centrifugal impeller 502 and the drainage holes 5024 are designed so that the water on the water absorbing blades 5022 is thrown out under the action of centrifugal force and flows through the water storage tank 402 and the return flow of the water collecting cylinder 401. The water is discharged from the pipe 403 to avoid the water from being mixed into the gas again. During the rotation of the centrifugal impeller 502, the reciprocating screw 504 is driven to rotate, so that the wiping roller 503 reciprocates up and down along the guide bar 405. The absorbent cotton 5033 on the wiping roller 503 fits with the inner wall of the filter cartridge 4. When the wiping roller 503 reciprocates up and down along the guide bar 405, the water droplets attached to the inner wall of the filter cartridge 4 can be removed to keep the inner wall dry and clean. The rotation of the reciprocating screw 504 drives the wiping roller 503 to move. When the wiping roller 503 reaches the bottom, the drainage boss 40 4 squeezes the absorbent cotton 5033 to squeeze out the water therein, realizes dehydration of the absorbent cotton 5033, and maintains its water absorption performance. Driven by the transmission plate 601, the cleaning brush 602 rotates around the filter cartridge 4 and swings up and down to clean the surface of the filter cartridge 4 to remove the particle impurities on the surface and improve the air permeability and separation efficiency of the filter cartridge 4. When the air pump power is insufficient, the electric shaft 501 of the motor 7 can be rotated to increase the centrifugal force of the centrifugal impeller 502 to improve the gas-liquid separation effect. The separated gas enters the detection equipment for detection.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas-liquid separator for air pollution detection, comprising a separation cylinder (2), an end cover (1), a return plate (3) and a filter cylinder (4), characterized in that: A secondary separation mechanism (5) is arranged inside the filter cartridge (4), a cleaning mechanism (6) is arranged at the outer end of the filter cartridge (4), and a motor (7) drivingly connected to the secondary separation mechanism (5) is arranged at the upper end of the end cover (1); An air inlet (101) and an air outlet (102) are respectively arranged on the left and right sides of the end cover (1); the return plate (3) and the filter cartridge (4) are detachably mounted on the lower end of the end cover (1); the end cover (1) is detachably mounted on the upper end of the separation cartridge (2); and a drain outlet (103) is arranged at the bottom of the separation cartridge (2); The secondary separation mechanism (5) comprises a rotating shaft (501), a centrifugal impeller (502) and a wiping roller (503); a water collecting cylinder (401) cooperating with the secondary separation mechanism (5) is arranged on the top of the side of the filter cartridge (4); the secondary separation mechanism (5) is installed in the filter cartridge (4) and is rotatably connected to the end cover (1); The cleaning mechanism (6) comprises a transmission plate (601) and a cleaning brush (602); the cleaning mechanism (6) is mounted on the bottom of the filter cartridge (4) and fixedly connected to the secondary separation mechanism (5); The centrifugal impeller (502) comprises a shaft sleeve (5021), a water absorption blade (5022) and a stabilizing ring (5023); the water absorption blade (5022) is fixedly mounted on the shaft sleeve (5021); the shaft sleeve (5021) is fixedly mounted on the rotating shaft (501); the water absorption blade (5022) is an arc-shaped structure; the stabilizing ring (5023) is fixedly mounted on the outside of the water absorption blade (5022); the centrifugal impeller (502) is located inside the water collecting cylinder (401); and the diameter of the centrifugal impeller (502) is greater than the diameter of the filter cylinder (4); The water absorbing blade (5022) is made of porous ceramics, a drainage hole (5024) is provided on the side of the stabilizing ring (5023), the upper end surface of the drainage hole (5024) is flush with the lower end surface of the water absorbing blade (5022), and a guide plate (5025) is provided on the inner end surface of the stabilizing ring (5023); A reciprocating screw (504) is fixedly connected to the bottom of the rotating shaft (501), a slider (5031) threadedly matched with the reciprocating screw (504) is arranged at the center of the wiping roller (503), a water-absorbing cotton (5033) abutting against the inner end surface of the filter cartridge (4) is arranged on the wiping roller (503), a guide groove (5032) is arranged on the side of the slider (5031), and a guide strip (405) slidably matched with the guide groove (5032) is arranged on the inner end surface of the filter cartridge (4); The side end surface and the bottom of the filter cartridge (4) are provided with honeycomb-shaped small holes, and the bottom upper end surface of the filter cartridge (4) is provided with a drainage boss (404) corresponding to the shape of the water-absorbing cotton (5033), and the surface of the drainage boss (404) is a mesh-like structure. When the wiping roller (503) moves to the bottom of the filter cartridge (4), the drainage boss (404) squeezes the water-absorbing cotton (5033) on the surface of the wiping roller (503), thereby squeezing out water droplets inside the wiping roller (503), and the squeezed water passes through the drainage boss (404) and the filter cartridge (4) and flows downward to the drainage port (103), thereby achieving dehydration of the wiping roller (503); The bottom of the reciprocating screw rod (504) passes through the filter cartridge (4) and is connected to the transmission plate (601); the cleaning brush (602) is movably mounted on the upper end surface of the transmission plate (601); the surface of the cleaning brush (602) is provided with bristles (603) that fit the surface of the filter cartridge (4); a spring (604) is provided at the bottom of the cleaning brush (602); the cleaning brush (602) and the transmission plate (601) are elastically connected via the spring (604); the top of the cleaning brush (602) fits the bottom lower end surface of the water collecting cartridge (401); and the lower end surface of the water collecting cartridge (401) is a wave-shaped structure.

2. A gas-liquid separator for air pollution detection as claimed in claim 1, characterized in that: A water storage tank (402) is provided on the upper end surface of the bottom of the water collecting cylinder (401); the water storage tank (402) is a circular ring structure; a return pipe (403) is provided at the bottom of the water storage tank (402); a one-way valve (4031) is provided in the return pipe (403).

3. A gas-liquid separator for air pollution detection as claimed in claim 1, characterized in that: The outer end surface of the return plate (3) is provided with a spiral guide plate (301), and the spiral guide plate (301) is in contact with the inner end surface of the separation cylinder (2).

4. A gas-liquid separator for air pollution detection as claimed in claim 1, characterized in that: A one-way bearing is provided between the motor (7) and the rotating shaft (501), and the motor (7) and the rotating shaft (501) are rotatably connected via the one-way bearing.

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