Fresh air purification device of central air conditioner

Abstract

The invention relates to the technical field of air purification, and particularly discloses a central air conditioner fresh air purification device which comprises a driving roller, a driven roller, an oil removal belt and an oil storage box, air entering an air channel can collide with the oil removal belt so that oil in the air can be attached to the outer surface of the oil removal belt, and the driving roller and the driven roller are both rotationally connected into the air channel and can rotate relative to the oil removal belt. The oil removal belt is in transmission connection between the driving roller and the driven roller, transmission can be achieved among the driving roller, the driven roller and the oil removal belt, the oil storage box is connected into the air duct and makes contact with the oil removal belt, and the oil storage box can scrape and collect oil on the oil removal belt; according to the fresh air purification device of the central air conditioner, air entering the air duct collides with the oil removal belt firstly, so that oil in the air is attached to the oil removal belt and is scraped and collected through the oil storage box during transmission of the oil removal belt, the situation that an oil film is formed after the oil is attached to the purification part is avoided, and the cleaning frequency of the purification part is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to a central air-conditioning fresh air purification device. Background Art

[0002] The central air-conditioning system consists of one or more cold and heat source systems and multiple air conditioning systems. This system is different from traditional refrigerant air conditioners. It centrally processes air to meet comfort requirements. Compared with traditional air conditioners, central air conditioners have the advantages of wide effective area and good cooling and heating effects. Therefore, central air conditioners are widely used. When using central air conditioners, fresh air purification devices are required to purify the air.

[0003] A Chinese patent application document with publication number CN112413802A discloses a special purification device for central air conditioning, including a purification pipe, an air inlet pipe and an air outlet pipe are respectively arranged at both ends of the purification pipe, an exhaust fan is arranged in the air inlet pipe, a reciprocating screw is rotatably arranged on the left side of the inner cavity of the purification pipe, a scraper is arranged on the reciprocating screw, a dust filter plate is arranged on the right side of the scraper, a driving motor is arranged at the top of the purification pipe, the driving motor is connected to the reciprocating screw, a rotating shaft is arranged on the right side of the dust filter plate, striking wheels are symmetrically fixed on the rotating shaft, the driving motor is connected to the rotating shaft, a glass tube is arranged in the middle of the inner cavity of the purification pipe, and an ultraviolet lamp is arranged on the top wall of the inner cavity of the purification pipe; the dust filter plate of the invention can effectively remove dust in the air, and can also effectively remove dust accumulated on the dust filter plate, which is easy to clean, can effectively remove harmful gases and odors through photocatalytic reaction, kill bacteria, and activated carbon and HEPA filters can further remove particles in the air, and the purification effect is good.

[0004] However, the above patent still has the following shortcomings: during use, the purification components in the purification device need to be cleaned regularly. However, when the central air-conditioning fresh air purification device is used in a food processing factory, the air will contain some oil. When passing through the purification device, the oil is easy to adhere to the purification components, thereby forming an oil film, which easily speeds up the cleaning frequency of the purification components. Summary of the invention

[0005] The present invention provides a central air conditioning fresh air purification device, aiming to solve the problem in the related art that oil is easily attached to the purification components to form an oil film, which easily speeds up the cleaning frequency of the purification components.

[0006] The central air conditioning fresh air purification device of the present invention comprises a purification mechanism, which comprises an air duct and a purification component, wherein the purification component is connected in the air duct, and further comprises: an oil removal mechanism, wherein after the outside air enters the air duct, it first passes through the oil removal mechanism and then passes through the purification component, the oil removal mechanism comprises an active roller, a driven roller, an oil removal belt and an oil storage box, and the air after entering the air duct can collide with the oil removal belt so that the oil in the air adheres to the outer surface of the oil removal belt, the active roller and the driven roller are both rotatably connected in the air duct, the oil removal belt is transmission-connected between the active roller and the driven roller, and the active roller, the driven roller and the oil removal belt can transmit, the oil storage box is connected in the air duct and contacts with the oil removal belt, and the oil storage box can scrape the oil on the oil removal belt and collect it; a throwing mechanism, which is connected to the oil removal mechanism and is used to throw the oil in the oil storage box into the air duct, and the thrown oil is large-particle oil, and its weight is greater than the flow force of the air; an adjustment mechanism, which is connected to the oil removal mechanism and is used to adjust the throwing angle of the throwing mechanism for the large-particle oil.

[0007] Beneficial effect: The air entering the air duct collides with the degreasing belt first, so that the oil in the air adheres to the degreasing belt, and is scraped and collected by the oil storage box when the degreasing belt is driven, avoiding the oil from adhering to the purification part and forming an oil film, thereby reducing the cleaning frequency of the purification part.

[0008] Preferably, a driving source is connected to the outer side of the air duct, and an output shaft of the driving source is connected to the active roller to provide power for the transmission between the active roller, the driven roller and the oil removal belt.

[0009] Preferably, the throwing mechanism comprises a throwing roller, a throwing trough, a rotating shaft and a transmission member, the throwing roller is rotatably connected in the oil storage box, and the throwing roller extends out of the oil storage box, and a throwing trough is provided on the throwing roller, the throwing roller can rotate, and throw the oil in the oil storage box into the air duct through the throwing trough. The effect is that the throwing roller throws large particles of oil into the air duct, thereby purifying the dust in the air duct, thereby reducing the cleaning frequency of the purification member.

[0010] Preferably, the rotating shaft 1 is connected to the spreading roller, and the transmission member is connected between the rotating shaft 1 and the driven roller, so that when the driven roller rotates, the rotating shaft 1 is driven to rotate through the transmission member, thereby providing power for the rotation of the spreading roller.

[0011] Preferably, the transmission member includes a transmission part 1, a transmission disc, a mounting shell, a fixed ring, an elastic ring, an inflatable member and a rotating shaft 2, the rotating shaft 2 is rotatably connected to the air duct, the transmission part 1 is connected between the rotating shaft 2 and the driven roller, the transmission disc is connected to the rotating shaft 2, the mounting shell is connected to the rotating shaft 1, the fixed ring is rotatably connected to the front side of the mounting shell, an elastic ring is connected to the outer peripheral surface of the mounting shell, a sealed cavity can be formed between the elastic ring, the mounting shell and the fixed ring, the inflatable member is connected to the air duct, the inflatable member is connected to the fixed ring, and the inflatable member can inflate or exhaust air into the sealed cavity. The effect is that the inflatable member inflates the cavity so that the outer surface of the elastic ring is in close contact with the outer side of the transmission disc, the driven roller rotates to drive the throwing roller to rotate, and the oil in the oil storage box can be stored to a certain amount and then drive the throwing roller to rotate, so that the throwing roller can throw out large particles of oil.

[0012] Preferably, the outer surface of the elastic ring is a friction surface, which has the effect that the friction force between the elastic ring and the transmission disc can be enhanced by using the outer surface of the elastic ring as a friction surface, so as to enhance the driving effect of the transmission disc on the elastic ring when it rotates.

[0013] Preferably, the adjustment mechanism includes a housing, a reciprocating screw, a second transmission part and a shielding part, the housing is connected to the bottom of the oil storage box, the reciprocating screw is rotatably connected in the housing, the shielding part is threadedly connected to the reciprocating screw and is limitedly slidably connected to the housing, the shielding part is in contact with the outer peripheral surface of the throwing roller, the second transmission part is connected between the reciprocating screw and the first rotating shaft, and the second transmission part is located in the housing. The effect is that the throwing height of the throwing groove on the throwing roller to the oil can be adjusted by moving the shielding part forward and backward, thereby enhancing the purification effect of the dust in the air duct, thereby reducing the cleaning frequency of the purification component.

[0014] The beneficial effects of the present invention are: 1. The air entering the air duct can collide with the degreasing belt, so that the oil in the air can adhere to the degreasing belt. When the degreasing belt is in transmission, the oil attached to the degreasing belt is scraped and collected through the oil storage box to avoid the oil adhering to the purification part to form an oil film, thereby reducing the cleaning frequency of the purification part.

[0015] 2. When the spreading roller drives the spreading trough to rotate, the oil in the oil storage box can be sprinkled into the air duct. The large particles of oil formed by the sprinkling can adhere to the dust in the air, reducing the amount of dust when the air passes through the purification part, thereby reducing the cleaning frequency of the purification part.

[0016] 3. The shielding height of the splashing trough can be changed by moving the shielding part forward and backward, so that the oil in the splashing trough can be separated from the splashing trough at different heights, so as to enhance the purification effect of large-particle oil on dust in the air duct and reduce the cleaning frequency of the purification parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 2 It is a cross-sectional three-dimensional structural schematic diagram of the present invention.

[0019] Figure 3 It is a schematic diagram of the main cross-sectional structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the spreading roller of the present invention.

[0021] Figure 5 It is a schematic diagram of the main cross-sectional structure of the spreading roller of the present invention.

[0022] Figure 6 It is a schematic diagram of the main structure of the transmission member of the present invention.

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the transmission member of the present invention.

[0024] Figure 8 It is a cross-sectional three-dimensional structural schematic diagram of the transmission member of the present invention.

[0025] Fig. 9 It is a cross-sectional three-dimensional structural schematic diagram of the adjustment mechanism of the present invention.

[0026] Reference numerals: 1. Purification mechanism; 11. Air duct; 12. Air outlet; 13. Air inlet; 14. Purification element; 2. Oil removal mechanism; 21. Active roller; 22. Driven roller; 23. Oil removal belt; 24. Driving source; 25. Oil storage box; 3. Sprinkling mechanism; 31. Sprinkling roller; 32. Sprinkling trough; 33. Rotating shaft one; 34. Transmission element; 341. Transmission part one; 342. Transmission disk; 343. Mounting shell; 344. Fixed ring; 345. Elastic ring; 346. Inflatable element; 347. Rotating shaft two; 4. Adjustment mechanism; 41. Shell; 42. Reciprocating screw; 43. Transmission part two; 44. Moving part; 45. Shielding part. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] like Figures 1 to 9As shown, the central air conditioning fresh air purification device of the present invention includes a purification mechanism 1, an oil removal mechanism 2, a sprinkling mechanism 3 and an adjustment mechanism 4. The purification mechanism 1 is used to purify the air entering the central air conditioner. The oil removal mechanism 2 is connected in the purification mechanism 1, and can remove and collect oil in the air, thereby reducing the cleaning frequency of the purification mechanism 1. The sprinkling mechanism 3 is connected to the oil removal mechanism 2, and can sprinkle the oil to form large particles in the purification mechanism 1. At this time, the weight of the large particles of oil is much greater than the flow force of the air, so that the large particles of oil will not move with the air flow trajectory. At the same time, the large particles of oil can purify the dust in the air, further reducing the cleaning frequency of the purification mechanism 1. The adjustment mechanism 4 is connected to the oil removal mechanism 2, and is used to adjust the sprinkling angle of the sprinkling mechanism 3 to the large particles of oil, thereby enhancing the purification effect of the large particles of oil on the dust in the air, thereby reducing the cleaning frequency of the purification mechanism 1.

[0029] like Figure 1 and Figure 2 As shown, the purification mechanism 1 includes an air duct 11, which is connected to the air intake of the central air conditioner. The two ends of the air duct 11 are an air outlet 12 and an air inlet 13 respectively. The air outlet 12 of the air duct 11 is connected with a purification component 14 for purifying the air. The purification component 14 includes a filter and activated carbon. The air enters the central air conditioner after passing through the filter and the activated carbon in turn. The dust in the air can be filtered through the filter, and the harmful substances in the air can be adsorbed by the activated carbon to improve the air quality.

[0030] like Figures 1 to 4 As shown, the oil removal mechanism 2 includes an active roller 21, a driven roller 22, an oil removal belt 23, a driving source 24 and an oil storage box 25. The active roller 21 and the driven roller 22 are both rotatably connected in the air duct 11. The oil removal belt 23 is transmission-connected between the active roller 21 and the driven roller 22. The oil removal belt 23 is made of rubber material. The air entering the air duct 11 through the air inlet 13 can collide with the oil removal belt 23 so that the oil in the air adheres to the outer surface of the oil removal belt 23. The driving source 24 is connected to the outside of the air duct 11. The driving source 24 is a motor. The output shaft of the motor is connected to the active roller 21. The oil storage box 25 is connected in the air duct 11. One side of the top of the oil storage box 25 is in contact with the bottom end of the oil removal belt 23. When the oil removal belt 23 is transmitted, the oil on the oil removal belt 23 can be scraped through the oil storage box 25 and collected.

[0031] The central air conditioner is started, and the fan in the central air conditioner is used to allow the outside air to enter the air duct 11 through the air inlet 13. The air entering the air duct 11 directly collides with the degreasing belt 23, so that the oil in the air adheres to the outer surface of the degreasing belt 23. The driving source 24 is started to drive the transmission between the active roller 21, the driven roller 22 and the degreasing belt 23, and the active roller 21 and the driven roller 22 both rotate counterclockwise. When the degreasing belt 23 is transmitted, the oil on the degreasing belt 23 is scraped by the oil storage box 25, and the scraped oil is collected to prevent the oil from adhering to the purification component 14 to form an oil film, thereby reducing the cleaning frequency of the purification component.

[0032] like Figures 1 to 8 As shown, the spreading mechanism 3 includes a spreading roller 31, a spreading groove 32, a rotating shaft 33 and a transmission member 34. The spreading roller 31 is rotatably connected to the oil storage box 25, and the spreading roller 31 extends out of the oil storage box 25. The spreading groove 32 is provided on the spreading roller 31. The spreading roller 31 can rotate clockwise. When the spreading roller 31 rotates clockwise, the oil in the oil storage box 25 can enter the spreading groove 32, and after the spreading groove 32 is separated from the oil storage box 25, the oil inside the spreading groove 32 can be thrown into the air duct 11, and the thrown oil is large-particle oil. The weight of the large-particle oil is much greater than the flow force of the air to prevent the large-particle oil from being driven to the purification member 14 by the air. At this time, the large-particle oil thrown out The liquid can adhere to the dust in the air in the air duct 11, reduce the amount of dust when the air passes through the purification element 14, thereby reducing the cleaning frequency of the purification element 14. The rotating shaft 33 is connected to the spreading roller 31, and the rotating shaft 33 is coaxially arranged with the spreading roller 31. The front end of the rotating shaft 33 extends out of the air duct 11 and is rotatably connected thereto. The front end of the driven roller 22 extends out of the air duct 11 and is rotatably connected thereto. The transmission member 34 is connected to the rotating shaft 33 and one end of the driven roller 22 extending out of the air duct 11, so that when the driven roller 22 rotates, the rotating shaft 33 is driven to rotate through the transmission member 34, thereby providing power for the rotation of the spreading roller 31. A protective shell is connected to the outside of the air duct 11, and the transmission member 34 is located in the protective shell.

[0033] Continue to refer Figures 1 to 8As shown, the transmission member 34 includes a transmission part 1 341, a transmission disc 342, a mounting shell 343, a fixing ring 344, an elastic ring 345, an inflatable member 346 and a second rotating shaft 347. The second rotating shaft 347 is rotatably connected to the outside of the air duct 11. The transmission part 1 341 is connected between the second rotating shaft 347 and the driven roller 22, so that when the driven roller 22 rotates, the second rotating shaft 347 is driven to rotate in the same direction through the transmission part 1 341. The transmission part 1 341 includes a transmission belt and two transmission wheels. The two transmission wheels are respectively connected to the second rotating shaft 347 and the driven roller 22. The transmission belt is connected between the two transmission wheels. The transmission disc 342 is connected to the second rotating shaft 347. The second rotating shaft 347 is connected to the driven roller 22. When 47 rotates, it can drive the transmission plate 342 to rotate, the mounting shell 343 is connected to the rotating shaft 33, the fixing ring 344 is rotatably connected to the front side of the mounting shell 343, the fixing ring 344 is connected to the air duct 11, and an elastic ring 345 is connected to the outer peripheral surface of the mounting shell 343. The elastic ring 345 is made of rubber material, and the outer surface of the elastic ring 345 is a friction surface. A sealed cavity can be formed among the elastic ring 345, the mounting shell 343 and the fixing ring 344, and the inflatable piece 346 is connected to the air duct 11. The inflatable piece 346 is connected to the fixing ring 344. The inflatable piece 346 is an air pump, and the sealed cavity can be inflated or exhausted through the inflatable piece 346.

[0034] When the driven roller 22 rotates counterclockwise, the transmission part 1 341 drives the rotating shaft 2 347 to rotate counterclockwise. When the rotating shaft 2 347 rotates, it drives the transmission disk 342 to rotate counterclockwise. After a certain amount of oil in the oil storage box 25 is collected, the inflatable member 346 is started to inflate the cavity through the inflatable member 346 to expand the elastic ring 345 until the outer surface of the elastic ring 345 is in close contact with the outer side of the transmission disk 342. At this time, when the transmission disk 342 rotates, it can drive the elastic ring 345 to rotate clockwise, so that the elastic ring 345 drives the mounting shell 343 and the rotating shaft 1 33 to rotate clockwise, thereby providing power for the clockwise rotation of the spreading roller 31.

[0035] like Figure 2 , Figure 3 , Figure 4 and Fig. 9As shown, the adjustment mechanism 4 includes a housing 41, a reciprocating screw rod 42, a transmission part 43, a moving part 44 and a shielding part 45. The housing 41 is connected to the bottom of the oil storage box 25, the reciprocating screw rod 42 is rotatably connected in the housing 41, the moving part 44 is threadedly connected to the reciprocating screw rod 42, the moving part 44 is limitedly slidably connected in the housing 41, and the shielding part 45 is connected to the moving part 44. The shielding part 45 contacts the outer peripheral surface of the throwing roller 31, and the shielding part 45 can shield the throwing groove 32, and the shielding part 45 moves forward and backward. The movement can change the shielding height of the throwing groove 32 so that the oil in the throwing groove 32 can leave the throwing groove 32 at different heights. The transmission part 43 is connected between the reciprocating screw rod 42 and the rotating shaft 1 33, and the transmission part 43 is located in the shell 41. The transmission part 43 can make the reciprocating screw rod 42 rotate synchronously when the rotating shaft 1 33 rotates. The transmission part 43 includes a transmission belt and two transmission wheels. The two transmission wheels are respectively connected to the reciprocating screw rod 42 and the rotating shaft 1 33, and the transmission belt is connected between the two transmission wheels.

[0036] When the rotating shaft 1 33 rotates, the reciprocating screw 42 is driven to rotate synchronously through the transmission part 2 43, so that the reciprocating screw 42 drives the moving part 44 to move forward and backward. When the moving part 44 moves forward and backward, it drives the shielding part 45 to move forward and backward to change the shielding height of the spreading groove 32, thereby adjusting the spreading height of the large-particle oil, thereby enhancing the purification effect of the large-particle oil on the dust in the air duct 11 and reducing the cleaning frequency of the purification component 14.

[0037] Working principle: The central air conditioner is started, and the fan in the central air conditioner is used to allow outside air to enter the air duct 11 through the air inlet 13. The air entering the air duct 11 directly collides with the oil removal belt 23, so that the oil in the air adheres to the outer surface of the oil removal belt 23. The air after degreasing is purified by the purification component 14 and then enters the central air conditioner.

[0038] The driving source 24 is started to drive the transmission between the active roller 21, the driven roller 22 and the de-oiling belt 23, and the active roller 21 and the driven roller 22 both rotate counterclockwise. When the de-oiling belt 23 is transmitted, the oil on the de-oiling belt 23 is scraped by the oil storage box 25, and the scraped oil is collected. When the driven roller 22 rotates counterclockwise, the transmission part 1 341 drives the rotating shaft 2 347 to rotate counterclockwise, and when the rotating shaft 2 347 rotates, it drives the transmission plate 342 to rotate counterclockwise.

[0039] After a certain amount of oil is collected in the oil storage box 25, the inflatable member 346 is started to inflate the cavity through the inflatable member 346 to expand the elastic ring 345 until the outer surface of the elastic ring 345 is in close contact with the outer side of the transmission disk 342. At this time, when the transmission disk 342 rotates, it can drive the elastic ring 345 to rotate clockwise, so that the elastic ring 345 drives the mounting shell 343 and the rotating shaft 33 to rotate clockwise, thereby driving the spreading roller 31 to rotate clockwise.

[0040] When the spreading roller 31 rotates clockwise, the oil in the oil storage box 25 can enter the spreading groove 32, and after the spreading groove 32 is separated from the oil storage box 25, the oil inside the spreading groove 32 can be thrown into the air duct 11, and the thrown oil is large-particle oil, the weight of the large-particle oil is much greater than the flow force of the air, and the dust in the air is purified by the large-particle oil thrown out, and the large-particle oil mixed with the dust drips from the air inlet 13 of the air duct 11 to the outside, and can be collected by external collection equipment.

[0041] When the rotating shaft 1 33 rotates, the transmission part 2 43 drives the reciprocating screw 42 to rotate synchronously, so that the reciprocating screw 42 drives the moving part 44 to move forward and backward. When the moving part 44 moves forward and backward, it drives the shielding part 45 to move forward and backward to change the shielding height of the spreading groove 32, thereby adjusting the spreading height of the large particle oil.

[0042] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A central air conditioning fresh air purification device, comprising a purification mechanism (1), the purification mechanism (1) comprising an air duct (11) and a purification element (14), the purification element (14) being connected in the air duct (11), characterized in that: Also includes: The oil removal mechanism (2) is configured such that after the outside air enters the air duct (11), the air first passes through the oil removal mechanism (2) and then passes through the purification element (14). The oil removal mechanism (2) comprises an active roller (21), a driven roller (22), an oil removal belt (23) and an oil storage box (25). After entering the air duct (11), the air can collide with the oil removal belt (23), so that the oil in the air adheres to the outer surface of the oil removal belt (23). The active roller (21) and the driven roller (22) are both rotatably connected in the air duct (11). The oil removal belt (23) is transmission-connected between the active roller (21) and the driven roller (22). The active roller (21), the driven roller (22) and the oil removal belt (23) can transmit energy to each other. The oil storage box (25) is connected in the air duct (11) and is in contact with the oil removal belt (23). The oil storage box (25) can scrape and collect the oil on the oil removal belt (23). The throwing mechanism (3) is connected to the oil removal mechanism (2) and is used to throw the oil in the oil storage box (25) into the air duct (11), and the thrown oil is large-particle oil, and its weight is greater than the flow force of the air; The adjustment mechanism (4) is connected to the oil removal mechanism (2) and is used to adjust the angle at which the throwing mechanism (3) throws the large particles of oil.

2. The central air conditioning fresh air purification device according to claim 1, characterized in that: The outside of the air duct (11) is connected to a driving source (24), and an output shaft of the driving source (24) is connected to the active roller (21) for providing power for transmission between the active roller (21), the driven roller (22) and the de-oiling belt (23).

3. The central air conditioning fresh air purification device according to claim 1, characterized in that: The spreading mechanism (3) comprises a spreading roller (31), a spreading trough (32), a rotating shaft (33) and a transmission member (34). The spreading roller (31) is rotatably connected to the oil storage box (25) and extends out of the oil storage box (25). The spreading roller (31) is provided with a spreading trough (32). The spreading roller (31) is rotatable and spreads the oil in the oil storage box (25) into the air duct (11) through the spreading trough (32).

4. The central air conditioning fresh air purification device according to claim 3 is characterized in that: The rotating shaft one (33) is connected to the spreading roller (31), and the transmission member (34) is connected between the rotating shaft one (33) and the driven roller (22), so that when the driven roller (22) rotates, the rotating shaft one (33) is driven to rotate through the transmission member (34), thereby providing power for the rotation of the spreading roller (31).

5. The central air conditioning fresh air purification device according to claim 4, characterized in that: The transmission member (34) comprises a transmission part 1 (341), a transmission disc (342), a mounting shell (343), a fixing ring (344), an elastic ring (345), an inflatable member (346) and a second rotating shaft (347), wherein the second rotating shaft (347) is rotatably connected to the air duct (11), the transmission part 1 (341) is connected between the second rotating shaft (347) and the driven roller (22), the transmission disc (342) is connected to the second rotating shaft (347), and the mounting shell (343) is connected to the second rotating shaft (347). On the rotating shaft (33), a fixing ring (344) is rotatably connected to the front side of the mounting shell (343); an elastic ring (345) is connected to the outer peripheral surface of the mounting shell (343); a sealed cavity can be formed between the elastic ring (345), the mounting shell (343) and the fixing ring (344); an inflatable member (346) is connected to the air duct (11); the inflatable member (346) is connected to the fixing ring (344); and the inflatable member (346) can inflate or exhaust air into the sealed cavity.

6. The central air conditioning fresh air purification device according to claim 5, characterized in that: The outer surface of the elastic ring (345) is a friction surface.

7. The central air conditioning fresh air purification device according to claim 4, characterized in that: The adjustment mechanism (4) comprises a housing (41), a reciprocating screw (42), a second transmission part (43) and a shielding part (45); the housing (41) is connected to the bottom of the oil storage box (25); the reciprocating screw (42) is rotatably connected in the housing (41); the shielding part (45) is threadedly connected to the reciprocating screw (42) and is limitedly slidably connected to the housing (41); the shielding part (45) is in contact with the outer peripheral surface of the throwing roller (31); the second transmission part (43) is connected between the reciprocating screw (42) and the first rotating shaft (33); and the second transmission part (43) is located in the housing (41).

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