Intelligent resistance reduction type low-temperature denitration filter material bag and control method

Abstract

The invention discloses an intelligent resistance reduction type low-temperature denitration filter material bag and a control method, and relates to the technical field of filter material bag filtration and use. According to the invention, when industrial waste gas enters the filter material bag and filter blockage exists, the air pressure of the air flow in the filter cavity to the piston disc is increased, the distance sensing module is utilized to detect the moving state of the piston disc, and the air pump is utilized to reversely exhaust the pressure regulating cavity and accelerate the cleaning of the bristle assembly to the inner wall of the filter material bag; then the air pump is used for reversely inflating the pressure adjusting cavity, so that the piston disc moves downwards to the initial position of the low position, the inner wall of the filter material bag is cleaned in the whole process, and meanwhile, in the cleaning process, the cleaned position can recover relatively efficient dust filtration and air circulation; and the cleaned high-concentration dust airflow can be discharged out of the filter cavity through the exhaust valve in time, so that when the filter bag is cleaned, waste gas dust can be filtered to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering and using filter bags, and in particular to an intelligent drag-reducing low-temperature denitration filter bag and a control method thereof. Background Art

[0002] Commonly used filter materials for desulfurization, denitrification and dust removal include polypropylene, polyester, polyphenylene sulfide, glass fiber, etc. When the dust-laden gas passes through the desulfurization and denitrification dust removal filter bag, most of the dust particles will be retained on the surface of the filter material.

[0003] As time goes by, a dust layer will form on the surface of the denitrification and dust removal filter material. This dust layer will block and retain tiny particles, thereby improving the filtration efficiency of the filter material. As the dust layer on the surface of the filter bag becomes thicker, the operating resistance becomes greater and greater. If the dust layer on the surface of the filter bag is overloaded, the filtration effect of the filter bag will deteriorate.

[0004] At this time, the filter bag needs to be cleaned in reverse. Generally, the supply of exhaust gas to the filter bag is stopped, and then the filter bag is cleaned by air flow impact using reverse airflow.

[0005] However, this method will cause the filtration and dust removal process to be interrupted, affecting the efficiency of the entire assembly line process where the dust removal is located.

[0006] In summary, how to clean the denitrification dust removal filter bags without interrupting the filtration and dust removal process has become a problem that needs to be solved. Summary of the invention

[0007] In order to solve the above problems, the present invention provides an intelligent drag-reducing low-temperature denitrification filter bag and a control method, so that when the filter bag is being cleaned, it can also perform a certain degree of exhaust gas dust filtering, thus avoiding interruption of the filtering and dust removal process.

[0008] The present invention is achieved through the following technical solutions: The present invention provides an intelligent drag-reducing low-temperature denitration filter bag, wherein an upper fixing ring is arranged at the upper opening of the filter bag, and a lower fixing ring for straightening the filter bag is arranged at the bottom of the filter bag. A blocking cover is installed at the upper side of the upper fixing ring, and an inner insert cylinder inserted into the filter bag is fixedly installed at the bottom of the blocking cover.

[0009] A filter cavity is formed between the inner insert cylinder and the filter bag. The sealing cover is provided with an intake valve and an exhaust valve connected to the filter cavity. An intake photoelectric sensor module for detecting airflow turbidity is provided upstream of the intake valve, and an exhaust photoelectric sensor module for detecting airflow turbidity is provided downstream of the exhaust valve.

[0010] The inner plug-in tube is surrounded by a piston disc and a pressure regulating chamber between the upper side of the piston disc and the blocking cover. The blocking cover is equipped with an external valve connected to the pressure regulating chamber, the external valve is connected to an external pipe, and the external pipe is equipped with an air pump. The blocking cover is also equipped with a distance sensor module for detecting the vertical movement distance of the piston disc in the pressure regulating chamber.

[0011] A threaded barrel is fixedly provided at the center of the bottom of the inner insert barrel, and a vertical threaded through groove is provided on the threaded barrel. A plurality of ventilation grooves are also provided at the bottom of the inner insert barrel, which are located on the periphery of the threaded barrel. A shaft is rotatably connected to the center of the bottom side of the piston disc, and the shaft is provided with a threaded section that is screwed to the threaded barrel. Multiple sets of horizontal brackets are fixedly connected to the bottom of the shaft, and a vertical support rod is fixedly connected to the side end of each horizontal support rod, and the vertical support rod is provided with bristles that contact the inner wall of the filter bag.

[0012] As a preferred technical solution for the intelligent drag-reducing low-temperature denitrification filter bag of the present invention: sealing rings are sandwiched between the edge area of ​​the bottom side of the sealing cover and the upper fixed ring, and between the upper side of the inner insert and the bottom side of the sealing cover.

[0013] As an optimal technical solution for the intelligent drag-reducing low-temperature denitrification filter bag of the present invention: the air inlet end of the air inlet valve is connected to the exhaust gas inlet pipe, the air inlet photoelectric sensor module is arranged on the exhaust gas inlet pipe, the air outlet end of the exhaust valve is connected to the cleaned exhaust pipe, and the exhaust photoelectric sensor module is arranged on the cleaned exhaust pipe.

[0014] As a preferred technical solution for the intelligent drag-reducing low-temperature denitrification filter bag of the present invention: a bearing ring is arranged at the uppermost end of the shaft, and the bearing ring is installed at the center position of the side surface of the bottom of the piston disc.

[0015] As an optimal technical solution for the intelligent drag-reducing low-temperature denitrification filter bag of the present invention: a plurality of inner peripheral support plates are provided at the bottom of the inner insert tube, one end of the inner peripheral support plate is fixedly connected to the inner insert tube ring side plate, and the other ends of the plurality of inner peripheral support plates are jointly fixedly connected to the threaded tube.

[0016] As a preferred technical solution of the intelligent drag-reducing low-temperature denitration filter bag of the present invention: a piston ring is arranged on the piston disc ring side, and the piston ring is in sliding contact with the inner wall of the inner insert cylinder.

[0017] As a preferred technical solution for the intelligent drag-reducing low-temperature denitrification filter bag of the present invention: the angles between adjacent groups of horizontal brackets connected on the side of the shaft ring are the same, and the shaft, horizontal brackets and vertical support rods are integrated injection-molded plastic parts.

[0018] The present invention provides a control method for an intelligent drag-reducing low-temperature denitration filter bag, comprising the following contents: S1. The air inlet valve is opened, and the industrial waste gas enters the filter cavity of the filter bag. The industrial waste gas is filtered by the filter bag and then discharged from the filter cavity.

[0019] S2. The dust layer on the inner wall of the filter bag gradually thickens, and the gas resistance of the gas discharged from the filter bag gradually increases. The upstream side continues to inject industrial waste gas into the filter cavity.

[0020] S3. The gas in the filter cavity enters the inner tube through the ventilation groove on the bottom of the inner tube, pushing the piston disc upward. When the distance sensor module detects the distance L of the piston disc, x When it is less than the first distance reference value L1 preset by the system, the external valve is opened, the air pump is started, and the gas in the pressure regulating chamber is discharged outward at an accelerated speed.

[0021] S3.1. When the piston disc starts to move upward, the shaft moves upward, and as the threaded section and the threaded barrel cooperate, the shaft rotates, driving the bristles of the vertical support rod to rotate and clean the inner wall of the filter bag; S4. When the external valve is opened, the exhaust valve opens, and the dust cleaned by the brush is discharged from the filter bag along with a part of the industrial waste gas through the exhaust valve, and another part of the industrial waste gas is discharged after being filtered through the filter bag.

[0022] S5. During the upward movement of the piston disc, when the distance sensor module detects the distance L of the piston disc x If the distance is less than the second distance reference value L2 preset by the system, the air pump starts to inject gas into the pressure regulating chamber to push the piston plate down until the distance sensor module detects the distance L between the piston plate and the pressure regulating chamber. x If the distance is not less than the first distance reference value L1 preset by the system, the air pump stops and the external valve is closed.

[0023] S6. After the external valve is closed, the air intake photoelectric sensor module detects that the airflow turbidity is Φ 进气 , assuming that the airflow turbidity detected by the exhaust photoelectric sensor module is Φ 排气 , when Φ 排气 ≤Φ 进气 The exhaust valve is closed.

[0024] S7. Repeat the steps in S3 to S6.

[0025] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges an inner insert cylinder assembly in the filter bag, arranges a piston disk in the inner insert cylinder, rotates a connecting shaft rod at the bottom of the piston disk and links a brush assembly. When industrial waste gas enters the filter bag and there is filtration blockage, the airflow in the filter chamber increases the air pressure of the piston disk, and the distance sensor module is used to detect the movement state of the piston disk. The pressure regulating chamber is reversely exhausted by an air pump to accelerate the cleaning of the inner wall of the filter bag by the brush assembly. When the piston disk moves to the highest point of the stroke range, the air pump is used to reversely inflate the pressure regulating chamber so that the piston disk moves down to a low initial position. The inner wall of the filter bag is cleaned throughout the whole process. At the same time, during the cleaning process, the cleaned position can restore relatively efficient dust filtration and gas circulation, and the cleaned high-concentration dust airflow can also be discharged from the filter chamber through the exhaust valve in time, so that when the filter bag is being cleaned, a certain degree of waste gas dust filtering can also be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of the denitration filter bag and its matching components in the present invention.

[0027] Figure 2 for Figure 1 Schematic diagram of the partial enlargement of point A in the middle.

[0028] Figure 3 The structure of the cleaning auxiliary component in the present invention Figure 1 .

[0029] Figure 4 The structure of the cleaning auxiliary component in the present invention Figure 2 .

[0030] Figure 5 Schematic diagram of air flow direction when the filtration resistance in the denitrification filter bag is large.

[0031] Among them: 1-filter bag, 101-filter chamber; 2-upper fixing ring; 3-lower fixing ring; 4-sealing cover; 5-inner insert, 501-pressure regulating chamber, 502-inner support plate, 503-threaded cylinder, 504-venting groove; 6-piston disc, 601-piston ring; 7-shaft rod, 701-threaded section, 702-bearing ring; 8-cross bracket; 9-vertical support rod; 10-brush; 11-intake valve, 12-exhaust valve; 13-external connecting valve; 14-distance sensor module; 15-exhaust intake pipe; 16-exhaust cleaning pipe; 17-external connecting pipe; 18-air pump; 19-intake photoelectric sensor module; 20-exhaust photoelectric sensor module. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Embodiment 1: The present invention designs a low-temperature denitrification filter bag that can be cleaned intelligently according to the real-time filtering state and reduce the filtering resistance. The specific structure is as follows: See also Figure 1 The upper fixing ring 2 is fixedly installed on the upper opening of the filter bag 1, and the lower fixing ring 3 is installed on the bottom side of the filter bag 1, and the lower fixing ring 3 stretches the filter bag 1 downward.

[0034] The blocking cover 4 is fixedly arranged on the upper side of the upper fixed ring 2, a sealing ring is sandwiched between the edge area of ​​the bottom side of the blocking cover 4 and the upper fixed ring 2, an inner insert tube 5 inserted into the filter bag 1 is fixedly installed on the bottom side of the blocking cover 4, a sealing ring is also sandwiched between the upper side of the inner insert tube 5 and the bottom side of the blocking cover 4, and a filter chamber 101 is formed between the inner insert tube 5 and the filter bag 1.

[0035] See also Figure 2 The piston disc 6 is located inside the inner insert tube 5, and a piston ring 601 is installed on the ring side of the piston disc 6. The piston ring 601 is in sliding contact with the inner wall of the inner insert tube 5. The inner insert tube 5 is also provided with a pressure regulating chamber 501, and the inner insert tube 5 is located between the upper side of the piston disc 6 and the blocking cover 4.

[0036] See also Figure 1 , Figure 2 , Figure 5 The sealing cover 4 is provided with an intake valve 11 and an exhaust valve 12 which are connected to the filter chamber 101. An intake photoelectric sensor module 19 for detecting airflow turbidity is provided upstream of the intake valve 11, and an exhaust photoelectric sensor module 20 for detecting airflow turbidity is provided downstream of the exhaust valve 12.

[0037] The end of the exhaust gas intake pipe 15 is installed at the intake end of the intake valve 11, and an intake photoelectric sensor module 19 is also installed on the exhaust gas intake pipe 15. The intake photoelectric sensor module 19 detects the turbidity of the exhaust gas entering the filter bag. The upstream end of the cleaning exhaust pipe 16 is installed at the outlet end of the exhaust valve 12. An exhaust photoelectric sensor module 20 is also installed on the cleaning exhaust pipe 16. After the exhaust valve 12 is opened, the exhaust photoelectric sensor module 20 detects the turbidity of the exhaust gas discharged from the filter bag.

[0038] The plugging cover 4 is provided with an external valve 13 , which is communicated with the pressure regulating chamber 501 . The external valve 13 is also connected with an external pipe 17 , and an air pump 18 is installed on the external pipe 17 .

[0039] See also Figure 1 , Figure 2The blocking cover 4 is provided with a distance sensor module 14 , and the distance sensor module 14 detects the vertical movement distance of the piston disc 6 in the pressure regulating chamber 501 .

[0040] A threaded tube 503 is fixedly provided at the center of the bottom of the inner insert tube 5 , and the threaded tube 503 is provided with a vertical threaded through groove.

[0041] Combination Figure 4 There are multiple inner supporting plates 502 at the bottom of the inner insert tube 5, one end of the inner supporting plate 502 is fixedly connected to the ring side plate of the inner insert tube 5, and the other ends of the multiple inner supporting plates 502 jointly support the threaded tube 503, and ventilation grooves 504 are formed between adjacent inner supporting plates 502.

[0042] Combination Figure 2 The shaft rod 7 is provided with a threaded section 701, and the threaded section 701 is threadedly connected with the threaded tube 503. The top of the shaft rod 7 is provided with a bearing ring 702, and the bearing ring 702 is installed at the center position of the bottom side of the piston disc 6.

[0043] Combination Figure 3 , Figure 4 , multiple groups of horizontal brackets 8 are fixedly connected to the bottom area of ​​the shaft 7, and the angles between adjacent groups of horizontal brackets 8 are the same. For example, if two groups of horizontal brackets 8 are set, the angle is 180 degrees. If three groups are set, the angle is 120 degrees. A vertical support rod 9 is fixedly connected to the side end of each group of horizontal brackets 8, and bristles 10 are set on the vertical support rod 9. The shaft 7, horizontal brackets 8, and vertical support rods 9 are integrated injection-molded plastic parts. The bristles 10 are in contact with the inner wall of the filter bag 1. When the shaft 7 rotates, the bristles 10 can be driven to clean the inner wall of the filter bag 1.

[0044] Embodiment 2: The present invention designs a control method for intelligent cleaning and regulation of low-temperature denitration filter bags, which specifically includes the following steps: Step 1: After the air inlet valve 11 is opened, the industrial waste gas enters the filter cavity 101 of the filter bag 1 , and the industrial waste gas is discharged from the filter cavity 101 after being filtered by the filter bag 1 .

[0045] Step 2: The dust layer on the inner wall of the filter bag 1 gradually thickens, and the gas resistance of the gas discharged from the filter bag 1 gradually increases, and the upstream side continues to inject industrial waste gas into the filter cavity 101.

[0046] Step 3: The gas in the filter chamber 101 enters the inner tube 5 through the ventilation groove 504 at the bottom of the inner tube 5, pushing the piston plate 6 to move upward. When the distance sensor module 14 detects the distance L of the piston plate 6 x When the pressure difference is less than the first distance reference value L1 preset by the system, the external valve 13 is opened, and the air pump 18 is started to accelerate the discharge of the gas in the pressure regulating chamber 501.

[0047] Among them, the first distance reference value L1: when the filtration resistance in the filter chamber 101 increases, the air pressure begins to increase, but it does not mean that the filter bag is seriously clogged. It may be caused by the high instantaneous rate of the injected industrial waste gas. It is normal for the distance sensor module 14 to detect that there is a certain fluctuation in the distance of the piston disk 6. Once the piston disk 6 moves up a lot, that is, when the distance sensor module 14 detects that the distance of the piston disk 6 reaches above the set first distance reference value L1, the filter bag 1 is considered to be seriously clogged.

[0048] Process 1: When the piston plate 6 starts to move upward, the shaft rod 7 moves upward, and along with the threaded section 701 and the threaded barrel 503, the shaft rod 7 rotates, driving the bristles 10 of the vertical support rod 9 to rotate, and the inner wall of the filter bag is cleaned; Step 4: When the external valve 13 is opened, the exhaust valve 12 is opened, and the dust cleaned by the bristles is discharged from the filter bag along with a part of the industrial waste gas through the exhaust valve, and another part of the industrial waste gas is discharged after being filtered by the filter bag. At this time, part of the inner wall of the filter bag has been cleaned, and the efficiency of industrial waste gas filtration and discharge has begun to improve.

[0049] Step 5: During the upward movement of the piston plate 6, when the distance sensor module 14 detects the distance L of the piston plate 6 x When the distance L2 is less than the second distance reference value L2 preset by the system, the air pump 18 starts to inject gas toward the pressure regulating chamber 501 to push the piston plate 6 down until the distance sensor module 14 detects the distance L2 of the piston plate 6. x If the distance is not less than the first distance reference value L1 preset by the system, the air pump 18 stops and the external valve 13 is closed.

[0050] Among them, the second distance reference value L2: when the piston moves up to the highest point of the travel range, it cannot move up any further, and then needs to start moving down in the opposite direction. When the distance sensor module 14 detects that the distance of the piston disc is less than L2, it may be considered that the piston disc 6 has reached the highest point of the travel range.

[0051] Moreover, during the rising and falling process of the piston plate 6, the shaft rod 7 rotates, and can drive the bristles 10 to clean the inner wall of the filter bag.

[0052] Step 6: After the external valve 13 is closed, the air intake photoelectric sensor module 19 detects that the airflow turbidity is Φ 进气 , assuming that the airflow turbidity detected by the exhaust photoelectric sensor module 20 is Φ 排气 , when Φ 排气 ≤Φ 进气 When , the exhaust valve 12 is closed.

[0053] The "high" concentration dust exhaust gas discharged can be passed through coarse dust settling equipment to settle most of the dust, and then the airflow with relatively low dust concentration can be reintroduced into the filter bag for filtration and dust removal.

[0054] Finally, repeat the above steps and continue filtering and treating the industrial waste gas.

[0055] The above description is only a preferred embodiment of the present invention and is 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. An intelligent drag-reducing low-temperature denitration filter bag, characterized by: An upper fixing ring (2) is arranged at the upper opening of the filter material bag (1), and a lower fixing ring (3) for straightening the filter material bag (1) is arranged at the bottom of the filter material bag (1). A blocking cover (4) is installed at the upper side of the upper fixing ring (2), and an inner insert cylinder (5) inserted into the interior of the filter material bag (1) is fixedly installed at the bottom of the blocking cover (4); A filter cavity (101) is formed between the inner insert cylinder (5) and the filter bag (1); the blocking cover (4) is provided with an intake valve (11) and an exhaust valve (12) which are in communication with the filter cavity (101); an intake photoelectric sensor module (19) for detecting airflow turbidity is provided upstream of the intake valve (11); and an exhaust photoelectric sensor module (20) for detecting airflow turbidity is provided downstream of the exhaust valve (12); The inner periphery of the inner insert cylinder (5) is provided with a piston disk (6), and a pressure regulating chamber (501) located between the upper side of the piston disk (6) and the blocking cover (4); the blocking cover (4) is provided with an external valve (13) in communication with the pressure regulating chamber (501); the external valve (13) is connected to an external pipe (17); and the external pipe (17) is provided with an air pump (18); The blocking cover (4) is also provided with a distance sensing module (14) for detecting the vertical moving distance of the piston disc (6) in the pressure regulating chamber (501); A threaded cylinder (503) is fixedly provided at the center of the bottom of the inner insert cylinder (5), the threaded cylinder (503) is provided with a vertical threaded through groove, and a plurality of ventilation grooves (504) are also provided at the bottom of the inner insert cylinder (5) and are located on the periphery of the threaded cylinder (503); A shaft (7) is rotatably connected to the center of the bottom side of the piston disc (6); the shaft (7) is provided with a threaded section (701) threadedly connected to the threaded barrel (503); a plurality of groups of horizontal brackets (8) are fixedly connected to the bottom of the shaft (7); a vertical support rod (9) is fixedly connected to the side ends of the horizontal brackets (8); and the vertical support rod (9) is provided with bristles (10) that contact the inner wall of the filter bag (1).

2. The intelligent drag-reducing low-temperature denitration filter bag according to claim 1 is characterized in that: Sealing rings are sandwiched between the edge area of ​​the bottom side of the blocking cover (4) and the upper fixing ring (2), and between the upper side of the inner insert (5) and the bottom side of the blocking cover (4).

3. The intelligent drag-reducing low-temperature denitration filter bag according to claim 1 is characterized in that: The air inlet end of the air inlet valve (11) is connected to the exhaust gas inlet pipe (15), the air inlet photoelectric sensor module (19) is arranged on the exhaust gas inlet pipe (15), the air outlet end of the exhaust valve (12) is connected to the cleaned exhaust pipe (16), and the exhaust photoelectric sensor module (20) is arranged on the cleaned exhaust pipe (16).

4. The intelligent drag-reducing low-temperature denitration filter bag according to claim 1 is characterized in that: The uppermost end of the shaft rod (7) is provided with a bearing ring (702), and the bearing ring (702) is installed at the center position of the bottom side surface of the piston disc (6).

5. The intelligent drag-reducing low-temperature denitration filter bag according to claim 1 is characterized in that: A plurality of inner peripheral support plates (502) are provided at the bottom of the inner insert tube (5), one end of the inner peripheral support plate (502) is fixedly connected to the ring side plate of the inner insert tube (5), and the other ends of the plurality of inner peripheral support plates (502) are fixedly connected to the threaded tube (503).

6. The intelligent drag-reducing low-temperature denitration filter bag according to claim 1, characterized in that: A piston ring (601) is disposed on the ring side of the piston disc (6), and the piston ring (601) is in sliding contact with the inner wall of the inner insert cylinder (5).

7. The intelligent drag-reducing low-temperature denitration filter bag according to claim 1, characterized in that: The included angles between adjacent groups of transverse brackets (8) connected to the ring side of the shaft rod (7) are the same, and the shaft rod (7), transverse bracket (8) and vertical support rod (9) are integrally injection-molded plastic parts.

8. A control method for an intelligent drag-reducing low-temperature denitration filter bag, characterized in that: An intelligent drag-reducing low-temperature denitration filter bag according to any one of claims 1 to 7, comprising the following contents: S1. The air inlet valve (11) is opened, and the industrial waste gas enters the filter chamber (101) of the filter bag. The industrial waste gas is filtered by the filter bag and then discharged from the filter chamber (101); S2. The dust layer on the inner wall of the filter bag gradually thickens, and the gas resistance of the gas discharged from the filter bag gradually increases. The upstream side continues to inject industrial waste gas into the filter chamber (101); S3. The gas in the filter chamber (101) enters the inner tube (5) through the ventilation groove (504) on the bottom side of the inner tube (5), pushing the piston plate (6) to move upward. When the distance sensor module (14) detects the distance L of the piston plate (6), x When the pressure difference is less than a first distance reference value L1 preset by the system, the external valve (13) is opened, and the air pump (18) is started to accelerate the discharge of the gas in the pressure regulating chamber (501); S3.

1. When the piston plate (6) starts to move upward, the shaft (7) moves upward, and the threaded section (701) and the threaded barrel (503) cooperate with each other, and the shaft (7) rotates, driving the bristles (10) of the vertical support rod (9) to rotate, thereby cleaning the inner wall of the filter bag; S4. When the external valve (13) is opened, the exhaust valve (12) is opened, and the dust removed by the brush is discharged from the filter bag along with a portion of the industrial waste gas through the exhaust valve, and a portion of the industrial waste gas is filtered through the filter bag and discharged; S5. During the upward movement of the piston plate (6), when the distance sensor module (14) detects the distance L of the piston plate (6) x If the distance L2 is smaller than a second distance reference value L2 preset by the system, the air pump (18) starts to inject gas into the pressure regulating chamber (501) to push the piston plate (6) downward until the distance sensor module (14) detects the distance L of the piston plate (6). x When the distance is not less than a first distance reference value L1 preset by the system, the air pump (18) stops and the external valve (13) closes; S6. After the external valve (13) is closed, the air intake photoelectric sensor module (19) detects that the air flow turbidity is Φ 进气 , assuming that the airflow turbidity detected by the exhaust photoelectric sensor module (20) is Φ 排气 , when Φ 排气 ≤Φ 进气 When , the exhaust valve (12) is closed; S7. Repeat the steps S3 to S6.

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