Air purifying and filtering mechanism for indoor air conditioner pipeline

Abstract

The invention relates to the technical field of indoor air conditioner pipelines, in particular to an air purifying and filtering mechanism for an indoor air conditioner pipeline, which comprises an indoor pipe, an air pump is fixedly mounted on the outer side of an outdoor pipe, a main air pipe and an auxiliary air pipe are mounted at the output end of the air pump, a sleeve is rotatably mounted in the outdoor pipe, and a fixing plate is fixedly mounted on the outer side of the sleeve. A dustproof cover is fixedly connected to the outer side of the fixing plate, a fixing frame is fixedly connected to the interior of the outdoor pipe, a concave-convex ring is fixedly connected to one side of the fixing frame, and a motor is fixedly installed in the outdoor pipe. According to the air purifying and filtering mechanism for the indoor air conditioner pipeline, a motor works to drive a fixing plate to rotate and drive a dust cover to rotate, so that the left end of the dust cover moves along a concave-convex ring, the wave shape of the dust cover is changed in the rotating process, and then the surface tension of the dust cover is changed; and the dust is brought out of the outdoor pipe along with the operation of the air pump, so that the dust is cleaned more thoroughly.

Description

Technical Field

[0001] The invention relates to the technical field of indoor air-conditioning pipes, in particular to an air purification and filtering mechanism for indoor air-conditioning pipes. Background Art

[0002] At present, for air conditioners, the filter is generally set at the air outlet end of the indoor unit. Although this method is convenient for cleaning the filter, it will cause dust to adhere to the components inside the air conditioner, such as the fan, the shell inside the machine and other components. This requires the installation of an air purification filter mechanism in the pipeline.

[0003] A Chinese patent (publication number: CN111135642B) discloses an air purification and filtering mechanism for indoor air-conditioning ducts. The present invention provides an outdoor air intake joint and an air filter assembly and a self-cleaning assembly at the air intake end of the outdoor air intake head. The air filter assembly of the present invention can not only purify the air entering the indoor air-conditioning, but also the self-cleaning assembly can automatically clean the air filter assembly. In this way, in the self-cleaning mode of the indoor air-conditioning structure, the indoor air-conditioning can discharge the indoor air to the outdoors through the indoor air-conditioning duct, so as to cooperate with the self-cleaning assembly to realize the automatic cleaning of the air filter assembly and improve the automatic cleaning efficiency of the air-conditioning; however, there is a problem that some dust passes through the outer filter end net and adheres to the filter assembly, and the device uses the air conditioner to pump out the air flow outward, and cooperates with the backwash blowing assembly to remove the dust on the filter net by oscillating or rotating the outer filter end net, the outer conical net, and the inner conical net, but the cleaning of the dust attached to the filter assembly is poor.

[0004] In order to solve the above problems, we have made improvements and proposed an air purification and filtering mechanism for indoor air-conditioning ducts. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The present invention provides an air purification and filtering mechanism for indoor air-conditioning ducts, comprising an indoor pipe, an outdoor pipe fixedly installed at one end of the top end of the indoor pipe, an air pump fixedly installed on the outside of the outdoor pipe, a main air pipe and a secondary air pipe installed at the output end of the air pump, and the secondary air pipe passes through the inside of the main air pipe, a sleeve is rotatably installed inside the outdoor pipe, a fixing plate fixedly installed on the outside of the sleeve, and a concave-convex structure is provided on the side of the fixing plate, a dust cover is fixedly connected to the outside of the fixing plate, a fixing frame is fixedly connected to the inside of the outdoor pipe, a concave-convex ring is fixedly connected to one side of the fixing frame, and the end of the dust cover away from the fixing plate is sleeved on the outside of the concave-convex ring, an electric motor is fixedly installed inside the outdoor pipe, and the output end of the motor is connected to the fixing plate.

[0007] As a preferred technical solution of the present invention, a sleeve is fixedly connected to the center position of the fixed plate, a connecting pipe is slidably connected to the inner side of the sleeve, the connecting pipe is directly opposite and close to the end of the auxiliary air pipe, a buffer chamber is fixedly installed on the right end of the connecting pipe, and a plurality of nozzles are installed in a circular array on the side of the buffer chamber, and the air outlet end of the nozzle faces the dust cover.

[0008] As a preferred technical solution of the present invention, a follower is fixedly connected to the right side of the buffer chamber, a driving member is installed on the right side of the follower, and the driving member is fixedly connected to the output end of the motor, and a second spring is installed between the driving member and the driven member.

[0009] As a preferred technical solution of the present invention, a plurality of blocking members are installed on the right end of the driven member in a circular array, and the blocking members cooperate with the driving member.

[0010] As a preferred technical solution of the present invention, a bracket is fixedly installed on the left side of the interior of the connecting pipe, a sealing ring is fixedly connected to the left end of the bracket, a first spring is fixedly connected to the inner side of the bracket, a closing plate is fixedly connected to the left end of the first spring, and a groove is provided on the left side of the closing plate, and the closing plate coincides with the sealing ring.

[0011] As a preferred technical solution of the present invention, a plurality of limiting wheels are fixedly mounted on the right side of the fixed frame in a circular array, and the limiting wheels are arranged at the concave position of the concave-convex ring.

[0012] As a preferred technical solution of the present invention, the left end of the dust cover is fixedly connected to a limiting ring, and the limiting ring is arranged on the left side of the limiting wheel.

[0013] As a preferred technical solution of the present invention, the outer circumferential array of the secondary air pipe has a plurality of spiral leaves, and the spiral leaves extend from the inside of the main air pipe to the inner side of the dust cover.

[0014] As a preferred technical solution of the present invention, a dustproof net is fixedly installed on the left end of the outdoor pipe, and the main air pipe enters the interior of the outdoor pipe from the center position of the dustproof net.

[0015] The beneficial effects of the present invention are:

[0016] 1. An air purification and filtering mechanism for indoor air-conditioning ducts, which drives a fixed plate to rotate through the operation of a motor. The rotating fixed plate drives the dust cover to rotate, causing the left end of the dust cover to move along the concave and convex ring, so that the wave shape of the dust cover itself changes during the rotation, thereby changing the surface tension of the dust cover, causing dust to fall off the dust cover, and then the air pump blows it into the outdoor pipe through the main air pipe and the auxiliary air pipe. Since the dust cover is conical, after the air moves to the fixed plate, it flows outward along the fixed plate, and then blows the dust along the dust cover to the dust net, and then discharged to the outdoor pipe, so that the dust is cleaned more thoroughly.

[0017] 2. An air purification and filtering mechanism for indoor air-conditioning ducts. The air blown out of the auxiliary air duct enters the buffer chamber along the connecting pipe and reaches the right side of the dust cover. The air is then ejected along the nozzle and blown toward the dust cover, so that the air flows from right to left along the outdoor pipe and passes through the dust cover. The air passing through the dust cover can bring down the dust, and can also cooperate with the flowing air on the left side of the dust cover to bring the dust out of the outdoor pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a three-dimensional diagram of an air purification and filtering mechanism for indoor air-conditioning ducts according to the present invention;

[0020] Figure 2 It is a cross-sectional view of an air purification and filtering mechanism for indoor air-conditioning ducts of the present invention;

[0021] Figure 3 This is a schematic diagram of a motor for an air purification and filtering mechanism for indoor air-conditioning ducts according to the present invention;

[0022] Figure 4 It is a local explosion of an air purification and filtering mechanism used in indoor air-conditioning ducts of the present invention;

[0023] Figure 5 The present invention is an air purification filter mechanism for indoor air conditioning pipes Figure 4 Enlarged view of point A in the middle;

[0024] Figure 6 This is a schematic diagram of a limit ring of an air purification and filtering mechanism for indoor air-conditioning ducts according to the present invention;

[0025] Figure 7 This is a schematic diagram of a dust cover of an air purification and filtering mechanism for indoor air-conditioning ducts according to the present invention;

[0026] In the figure: 1. Outdoor pipe; 2. Indoor pipe; 3. Air pump; 4. Main air pipe; 5. Auxiliary air pipe; 6. Dust screen; 7. Spiral blade; 8. Fixed frame; 9. Dust cover; 10. Fixed plate; 11. Motor; 12. Concave and convex ring; 13. Limiting wheel; 14. Bracket; 15. First spring; 16. Closing plate; 17. Sleeve; 18. Connecting pipe; 19. Buffer chamber; 20. Nozzle; 21. Sealing ring; 22. Follower; 23. Blocking member; 24. Active member; 25. Second spring; 26. Limiting ring. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] Example: Figure 1-Figure 7 As shown, an air purification and filtering mechanism for indoor air-conditioning ducts includes an indoor pipe 2, an outdoor pipe 1 is fixedly installed at one end of the top of the indoor pipe 2, and an exhaust port is opened at the bottom of the outdoor pipe 1, from which dust can be cleaned out of the outdoor pipe 1, an air pump 3 is fixedly installed on the outside of the outdoor pipe 1, and a main air pipe 4 and a secondary air pipe 5 are installed at the output end of the air pump 3, and the secondary air pipe 5 passes through the inside of the main air pipe 4, a sleeve 17 is rotatably installed inside the outdoor pipe 1, a fixing plate 10 is fixedly installed on the outside of the sleeve 17, and a concave-convex structure is provided on the side of the fixing plate 10, a dust cover 9 is fixedly connected to the outside of the fixing plate 10, a fixing frame 8 is fixedly connected to the inside of the outdoor pipe 1, and a concave-convex structure is fixedly provided on the side of the fixing plate 10 The convex ring 12 is provided, and the end of the dust cover 9 away from the fixed plate 10 is sleeved on the outside of the concave-convex ring 12. The motor 11 is fixedly installed inside the outdoor pipe 1, and the output end of the motor 11 is connected to the fixed plate 10. The motor 11 is a low-speed motor that can rotate forward and backward. The speed of the motor 11 is 30-45 revolutions per minute. The left end of the outdoor pipe 1 is fixedly installed with a dust screen 6, and the main air pipe 4 enters the interior of the outdoor pipe 1 from the center of the dust screen 6. The fixed plate 10 and the concave-convex ring 12 are similar in shape. The dust cover 9 is installed between the fixed plate 10 and the fixed frame 8, so that the dust cover 9 is a conical wave shape with concave and convex shapes, which increases the overall surface area of ​​the dust cover 9 and makes it more convenient for air to pass through the dust cover 9;

[0029] The outdoor air passes through the dustproof net 6 and enters the outdoor pipe 1, and then flows along the outdoor pipe 1 and the indoor pipe 2 to the indoor air conditioner. After the dustproof net 6 performs preliminary dust removal on the air, the dust cover 9 performs secondary dust removal and purification on the air entering the outdoor pipe 1. As the air conditioner is used, dust adheres to the surface of the dust cover 9 facing the dustproof net 6. When self-cleaning is required, the air conditioner is in a stopped state, and the motor 11 drives the fixed plate 10 to rotate. The rotating fixed plate 10 drives the dust cover 9 to rotate, so that the left end of the dust cover 9 moves along the concave and convex ring 12, so that the wave shape of the dust cover 9 itself changes during the rotation, thereby changing the surface tension of the dust cover 9, causing dust to fall off the dust cover 9, and then the air pump 3 blows it into the outdoor pipe 1 through the main air pipe 4 and the auxiliary air pipe 5. Since the dust cover 9 is conical, after the air moves to the fixed plate 10, it flows outward along the fixed plate 10, and then blows the dust to the dustproof net 6 along the dust cover 9, and then discharges it from the outdoor pipe 1, so that the dust cleaning is more thorough.

[0030] Specifically, refer to Figure 2 、 Figure 3 and Figure 4 A sleeve 17 is fixedly connected to the center position of the fixed plate 10, and a connecting pipe 18 is slidably connected to the inner side of the sleeve 17. The connecting pipe 18 is opposite and close to the end of the auxiliary air pipe 5. A buffer chamber 19 is fixedly installed at the right end of the connecting pipe 18. A plurality of nozzles 20 are installed in a circular array on the side of the buffer chamber 19, and the air outlet end of the nozzle 20 faces the dust cover 9. The air blown out of the auxiliary air pipe 5 enters the buffer chamber 19 along the connecting pipe 18 and reaches the right side of the dust cover 9. Then the air is ejected along the nozzle 20 and blown toward the dust cover 9, so that the air flows from right to left along the outdoor pipe 1 and passes through the dust cover 9. The air passing through the dust cover 9 can bring down the dust, and can also cooperate with the flowing air on the left side of the dust cover 9 to bring the dust out of the outdoor pipe 1.

[0031] Specifically, refer to Figure 4 and Figure 5, the right side of the buffer chamber 19 is fixedly connected to a follower 22, and the right side of the follower 22 is matched with an active member 24, and the active member 24 is fixedly connected to the output end of the motor 11, and a second spring 25 is installed between the active member 24 and the follower 22. A plurality of blocking members 23 are installed on the right end of the follower 22 in a circular array, and the blocking members 23 cooperate with the active member 24. The follower 22 and the active member 24 are matched with each other in a concave-convex manner. A slope with a curvature is provided on one side of the concave part on the follower 22, and a slope with a curvature is also provided on one side of the convex part on the active member 24. The two slopes contact each other, thereby When the machine 11 drives the active member 24 to rotate, due to the relative movement of the two arc-shaped slopes, the second spring 25 is stretched, and the connecting pipe 18 is pushed along the sleeve 17 toward the auxiliary air pipe 5 until the end of the auxiliary air pipe 5 is inserted into the connecting pipe 18, so that enough air can be ejected from the nozzle 20. The blocking member 23 provided on the follower 22 is provided at the top of the recess, which serves to prevent the active member 24 from continuing to move. When the protrusion on the active member 24 is about to cross the recess on the follower 22, the protrusion is restricted by the blocking member 23, so that the moving active member 24 drives the follower 22 to rotate.

[0032] For further reference, Figure 4 and Figure 6 , the left side of the interior of the connecting pipe 18 is fixedly installed with a bracket 14, the left end of the bracket 14 is fixedly connected to a sealing ring 21, the inner side of the bracket 14 is fixedly connected to a first spring 15, the left end of the first spring 15 is fixedly connected to a closing plate 16, and a groove is opened on the left side of the closing plate 16, the closing plate 16 coincides with the sealing ring 21, and a sealing treatment is performed between the closing plate 16 and the sealing ring 21. The outer diameter of the auxiliary air pipe 5 is the same as the inner diameter of the sealing ring 21. In the process of inserting the auxiliary air pipe 5 into the connecting pipe 18, the auxiliary air pipe 5, the end of the closing plate 16 is pressed against the closing plate 16, so that the closing plate 16 compresses the first spring 15 until the closing plate 16 and the sealing ring 21 are misaligned, and air can enter the buffer chamber 19 along the groove on the closing plate 16 and the gap between the bracket 14 and the connecting pipe 18. When the auxiliary air pipe 5 is not inserted into the connecting pipe 18, the closing plate 16 and the sealing ring 21 coincide with each other, playing the role of blocking the connecting pipe 18, thereby preventing the air from reaching the right side of the dust cover 9 along the connecting pipe 18 during the daily operation of the air conditioner, thereby affecting the purification and filtration effect of the present structure.

[0033] Preferably, reference Figure 4 and Figure 7, a plurality of limiting wheels 13 are fixedly installed on the right side of the fixed frame 8 in a circular array, and the limiting wheel 13 is set in the concave position of the concave-convex ring 12, and the left end of the dust cover 9 is fixedly connected to the limiting ring 26, and the limiting ring 26 is set on the left side of the limiting wheel 13, and the limiting wheel 13 is in the concave position of the concave-convex ring 12, acting on the end of the dust cover 9, so that the overlapping part of the dust cover 9 and the concave-convex ring 12 is tightly fitted on the surface of the concave-convex ring 12, and the limiting ring 26 is between the limiting wheel 13 and the fixed frame 8, ensuring that the end of the dust cover 9 can be firmly sleeved on the outside of the concave-convex ring 12.

[0034] Preferably, the dust cover 9 includes a filtering and purification part and connecting parts at both ends. The filtering and purification part includes a filter membrane arranged on the outer surface and activated carbon particles coated inside, as well as a steel sheet arranged inside. The two ends of the steel sheet are respectively connected to the connecting parts at both ends of the dust cover 9. The function of the steel sheet is mainly to ensure that the dust cover 9 rotates at the same speed at both ends of the dust cover 9, to avoid large torsional deformation of the dust cover 9, which causes the dust cover 9 to fall off the concave-convex ring 12. The connecting parts at both ends are respectively a plastic part connected to the fixing plate 10 and a rubber part sleeved on the outside of the concave-convex ring 12. The inner diameter circumference of the rubber part is the same as the outer circumference of the concave-convex ring 12, or slightly smaller than the outer circumference of the concave-convex ring 12.

[0035] Specifically, refer to Figure 2 and Figure 3 The outer circumferential array of the auxiliary air pipe 5 has multiple spiral blades 7, and the spiral blades 7 extend from the main air pipe 4 to the inner side of the dust cover 9. When the air is ejected from the main air pipe 4, it is affected by the spiral blades 7 on the surface of the auxiliary air pipe 5, so that the air ejected from the main air pipe 4 acts on the dust cover 9 in a spiral path, and acts on the dust on the dust cover 9 at an oblique angle, so that the dust can be better removed from the dust cover 9.

[0036] Preferably, a dust collection device is installed on the outside of the outdoor pipe 1, and the input end of the dust collection device is set on the right side near the dustproof net 6. After the dust on the dust cover 9 is blown off, it is scattered inside the outdoor pipe 1. At this time, the dust collection device is working and can directly clean up the dust in the outdoor pipe 1, saving subsequent cleaning actions.

[0037] Working principle: Outdoor air passes through the dustproof net 6 and enters the outdoor pipe 1, then flows along the outdoor pipe 1 and the indoor pipe 2 to the indoor air conditioner. After the dustproof net 6 performs preliminary dust removal on the air, the dust cover 9 performs secondary dust removal and purification on the air entering the outdoor pipe 1. As the air conditioner is used, dust accumulates on the side of the dust cover 9 facing the dustproof net 6.

[0038] When self-cleaning is required, the air conditioner is in a stopped state. When the motor 11 drives the active member 24 to rotate, the relative movement of the two arc-shaped slopes causes the second spring 25 to be stretched, and the connecting pipe 18 is pushed toward the auxiliary air pipe 5 along the sleeve 17. The end of the auxiliary air pipe 5 squeezes the closing plate 16, causing the closing plate 16 to compress the first spring 15 until the closing plate 16 is misaligned with the sealing ring 21. The air pump 3 delivers air to the outdoor pipe 1 through the main air pipe 4 and the auxiliary air pipe 5. The air blown out of the auxiliary air pipe 5 enters the buffer along the connecting pipe 18. The air passes through the cavity 19 and reaches the right side of the dust cover 9. The air is then ejected along the nozzle 20 and blown toward the dust cover 9, causing the air to flow from right to left along the outdoor pipe 1 and pass through the dust cover 9. The air passing through the dust cover 9 can carry away the dust. The air ejected from the main air pipe 4 moves along the spiral blade 7, causing the air ejected from the main air pipe 4 to act on the dust cover 9 in a spiral path, acting on the dust on the dust cover 9 at an oblique angle. Due to the presence of the dust cover 9, most of the air flows along the dust cover 9 toward the dust screen 6, carrying the dust out of the outdoor pipe 1.

[0039] After the active member 24 abuts against the blocking member 23, the motor 11 drives the fixed plate 10 to rotate, thereby rotating the dust cover 9. The left end of the dust cover 9 and the concave-convex ring 12 move relative to each other, causing the shape of the dust cover 9 to change. This changes the surface tension of the dust cover 9, causing dust to fall off the dust cover 9 and be carried out of the outdoor pipe 1 by the return air.

[0040] When it is not necessary to shut down the machine, the ventilation efficiency of the dust cover 9 is maintained, the motor 11 is reversed, and the active member 24 directly drives the driven member 22. At this time, the auxiliary air pipe 5 is not inserted into the connecting pipe 18, and the air blown out from the main air pipe 4 and the auxiliary air pipe 5 by the air pump 3 directly acts on the left side of the dust cover 9. The air flowing back along the dust cover 9 brings the fallen air out of the outdoor pipe 1, and the filtering and purification structure can be self-cleaned without stopping the machine, while reducing the cleaning effect.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An air purification and filtering mechanism for indoor air conditioning ducts, comprising an indoor duct (2), characterized in that: An outdoor pipe (1) is fixedly installed at one end of the top end of the indoor pipe (2), an air pump (3) is fixedly installed on the outside of the outdoor pipe (1), a main air pipe (4) and a secondary air pipe (5) are installed on the output end of the air pump (3), and the secondary air pipe (5) passes through the inside of the main air pipe (4), a sleeve (17) is rotatably installed inside the outdoor pipe (1), a fixing plate (10) is fixedly installed on the outside of the sleeve (17), and a concave-convex structure is provided on the side of the fixing plate (10), a dust cover (9) is fixedly connected to the outside of the fixing plate (10), a fixing frame (8) is fixedly connected to one side of the fixing frame (8), and an end of the dust cover (9) away from the fixing plate (10) is sleeved on the outside of the concave-convex ring (12), a motor (11) is fixedly installed inside the outdoor pipe (1), and the output end of the motor (11) is connected to the fixing plate (10).

2. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 1, characterized in that: A sleeve (17) is fixedly connected to the center of the fixed plate (10), and a connecting pipe (18) is slidably connected to the inner side of the sleeve (17). The connecting pipe (18) is directly opposite and close to the end of the auxiliary air pipe (5). A buffer chamber (19) is fixedly installed at the right end of the connecting pipe (18). A plurality of nozzles (20) are installed in a circular array on the side of the buffer chamber (19), and the air outlet ends of the nozzles (20) face the dust cover (9).

3. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 2, characterized in that: A driven member (22) is fixedly connected to the right side of the buffer chamber (19), a driving member (24) is mounted on the right side of the driven member (22), and the driving member (24) is fixedly connected to the output end of the motor (11), and a second spring (25) is mounted between the driving member (24) and the driven member (22).

4. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 3, characterized in that: A plurality of blocking members (23) are mounted on the right end of the driven member (22) in a circumferential array, and the blocking members (23) cooperate with the active member (24).

5. The air purification and filtering mechanism for indoor air-conditioning ducts according to claim 2, characterized in that: A bracket (14) is fixedly installed on the left side of the interior of the connecting pipe (18), a sealing ring (21) is fixedly connected to the left end of the bracket (14), a first spring (15) is fixedly connected to the inner side of the bracket (14), a closing plate (16) is fixedly connected to the left end of the first spring (15), and a groove is provided on the left side of the closing plate (16), and the closing plate (16) overlaps with the sealing ring (21).

6. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 1, characterized in that: A plurality of limiting wheels (13) are fixedly mounted on the right side of the fixed frame (8) in a circumferential array, and the limiting wheels (13) are arranged at the concave position of the concave-convex ring (12).

7. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 1, characterized in that: The left end of the dust cover (9) is fixedly connected to a limiting ring (26), and the limiting ring (26) is arranged on the left side of the limiting wheel (13).

8. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 1, characterized in that: The outer circumferential array of the secondary air pipe (5) is provided with a plurality of spiral blades (7), and the spiral blades (7) extend from the inside of the main air pipe (4) to the inside of the dust cover (9).

9. The air purification and filtering mechanism for indoor air conditioning ducts according to claim 1, characterized in that: A dustproof net (6) is fixedly mounted on the left end of the outdoor pipe (1), and the main air pipe (4) enters the interior of the outdoor pipe (1) from the center of the dustproof net (6).

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