Filtering device for heating ventilation air conditioner and use method of filtering device

Abstract

The filtering device comprises a heating ventilation air conditioner air supply shell, a driving assembly is arranged at the top of the heating ventilation air conditioner air supply shell, a rotating shaft is arranged in the heating ventilation air conditioner air supply shell through the driving assembly, and a mounting frame is mounted on the surface of the rotating shaft through a bearing; and the mounting frame is mounted in the heating ventilation air conditioner air supply shell. The connecting shaft drives the positions of the filter screens on the upper side and the lower side to be exchanged through the rotating plate, so that the blocked filter screen rotates to the lower portion, the unused filter screen is located on the upper portion, the blocked filter screen can be replaced, and meanwhile when the filter screens are replaced, the heating ventilation air conditioner can still be used; the situation that the air inlet amount is smaller than the air outlet amount due to blockage of the filter screen is avoided, and therefore the situation that external air enters a room through gaps due to the pressure difference between the indoor space and the outdoor space is avoided, and the situation that the heating ventilation air conditioner needs to be stopped to replace the filter screen is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, ventilation and air conditioning, and in particular to a filtering device for heating, ventilation and air conditioning and a use method thereof. Background Art

[0002] HVAC is an air conditioner with heating, ventilation and air conditioning functions. Since the main functions of HVAC include heating, ventilation and air conditioning, the comprehensive abbreviation of these three functions is HVAC. HVAC is mainly composed of blowers, exhaust fans and air ducts. The blowers are responsible for sending fresh air or treated air from the outside into the room to ensure the normal indoor air renewal and oxygen content. The exhaust fans mainly discharge the dirty air, moisture, odor, etc. in the room to the outside, and the air ducts are channels for transporting air.

[0003] In order to ensure that the air delivered into the room by the blower remains clean, a filter is installed inside the air inlet fan of the HVAC to filter the incoming air. When the air enters the blower, the incoming air is filtered through the filter to prevent dust from entering the room with the air.

[0004] However, during the use of the air supply fan filter of the HVAC, dust will adhere to the surface of the filter. When there is too much dust attached to the surface of the filter, the filter will be blocked by dust. When the filter is blocked by dust, the amount of air discharged through the filter will be reduced, which will lead to a decrease in the amount of air entering the room, causing the air intake to be less than the air outlet, creating a negative pressure state indoors. Untreated outdoor air will be "sucked" into the room through gaps in doors and windows, holes and other loose places due to the pressure difference between the inside and outside. The air may carry impurities such as dust, pollen, and pollutants. Based on the above problems, the present application proposes a filter device for HVAC and a method of using the same. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a HVAC filter device and a method of using the same, which are used to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A filtering device for a HVAC and a method of using the same include a HVAC air supply housing, a driving assembly is provided on the top of the HVAC air supply housing, a rotating shaft is provided inside the HVAC air supply housing through the driving assembly, a mounting bracket is installed on the surface of the rotating shaft through a bearing, and the mounting bracket is installed inside the HVAC air supply housing, a fan blade is fixedly provided on the left end of the rotating shaft, a connecting shaft is provided on the right side of the rotating shaft, a transmission assembly is provided on the left end of the connecting shaft and the right end of the rotating shaft, the transmission assembly is used for connecting the rotating shaft and the connecting shaft, a rotating plate is fixedly provided on the right end of the connecting shaft, a filter screen is fixedly provided on the upper and lower sides of the rotating plate, a cleaning assembly is provided on the surface of the filter screen, the cleaning assembly is used to clean the replaced filter screen, and a collecting assembly for collecting cleaned dust is provided inside the HVAC air supply housing.

[0008] Preferably, the driving assembly includes a driving motor fixedly mounted on the top of the HVAC air supply casing, the output end of the driving motor is provided with a bevel gear 1, the output end of the driving motor is connected to the transmission shaft through the bevel gear 1, the number of the bevel gear 1 is two, and the two bevel gears 1 are respectively fixedly mounted on the output end of the driving motor and the top of the transmission shaft, and the bottom end of the transmission shaft is provided with a bevel gear 2, the number of the bevel gear 2 is two, and the two bevel gears 2 are respectively fixedly mounted on the bottom end of the transmission shaft and the surface of the rotating shaft.

[0009] Preferably, the transmission assembly includes a mounting plate fixedly mounted inside the HVAC air supply casing, a mounting rod is fixedly mounted on the left end of the mounting plate, a movable plate is slidably mounted on the surface of the mounting rod, a transverse spring is connected between the right side of the movable plate and the left side of the mounting plate, a connecting plate is arranged on the left side of the movable plate, the connecting plate is fixedly mounted inside the HVAC air supply casing, an electromagnet is fixedly mounted on the right side of the connecting plate, a fixing ring is fixedly mounted on the bottom of the movable plate, a limited position circular groove is arranged inside the fixing ring, a limited position circular ring is rotatably arranged inside the limited position circular groove, a connecting ring is fixedly arranged inside the limited position circular ring, an insertion rod is fixedly mounted on the left and right sides of the connecting ring, a connecting disk and a locking disk are respectively arranged on the left and right sides of the connecting ring, the connecting disk is fixedly mounted on the right end of the rotating shaft, a rotating sleeve is rotatably arranged inside the locking disk, a connecting groove is arranged inside the rotating sleeve and inside the connecting ring, a connecting strip is slidably arranged inside the connecting groove, the connecting strip is fixedly mounted on the surface of the connecting shaft, a locking plate is fixedly arranged on the surface of the locking disk, and the locking plate is fixedly mounted on the bottom of the mounting plate.

[0010] Preferably, the cleaning assembly includes a protective cover and an isolation cover overlapped on the left and right sides of the rotating plate, the protective cover and the isolation cover are fixedly installed inside the HVAC air supply casing, a rectangular plate is fixedly provided on the upper side wall of the protective cover, a cleaning brush is fixedly provided on the bottom of the rectangular plate, the cleaning brush is in contact with the filter screen below, and a filter screen is fixedly provided inside the protective cover.

[0011] Preferably, the collecting assembly includes a collecting box fixedly mounted inside the HVAC air supply casing, a collecting box is slidably arranged inside the collecting box, a blocking net is fixedly arranged inside the collecting box, a trapezoidal plate is fixedly arranged on the rear side of the collecting box, a sealing plate is overlapped on the top of the trapezoidal plate, a vertical spring is connected between the upper wall of the sealing plate and the top of the blocking net, mounting grooves are provided on the left and right sides of the collecting box, a metal elastic sheet is fixedly arranged inside the mounting groove, and hemispherical grooves matching the metal elastic sheet are provided on the left and right side walls of the collecting box, a dust inlet pipe is fixedly arranged on the top of the collecting box, and the inlet end of the dust inlet pipe passes through the HVAC air supply casing and extends to the inside of the protective cover.

[0012] Preferably, the surfaces of the connection disk and the locking disk are both penetrated by limiting holes, and the number of the limiting holes is several.

[0013] Preferably, the isolation cover and the protective cover are both semicircular in structure, a semicircular groove for connecting with the connecting shaft is provided on the top of the isolation cover, and the isolation cover and the protective cover are both made of metal.

[0014] A method for using a filter device for HVAC, comprising the following steps:

[0015] Step 1: The driving assembly drives the rotating shaft to drive the fan blades to rotate. Under the action of the fan blades, the external air enters the HVAC air supply housing. As the air moves to the left in the HVAC air supply housing, the filter screen filters the incoming air.

[0016] Step 2: When the filter screen at the top of the rotating plate is clogged due to excessive dust, the rotating shaft and the connecting shaft are connected through the transmission assembly, so that when the driving assembly drives the rotating shaft to rotate, the rotating shaft can drive the connecting shaft to rotate through the transmission assembly, and the rotating plate is driven to rotate through the connecting shaft, so that the rotating plate drives the filter screen to move, so that the positions of the top and bottom filter screens are interchanged, and during the process of exchanging the positions of the filter screens, the cleaning assembly sweeps off the dust attached to the filter screen;

[0017] Step 3: After the dust attached to the filter is cleaned and swept away, the fan blades rotate to draw air, so that the cleaned dust enters the collection component, and the cleaned dust is collected by the collection component to prevent the cleaned dust from reattaching to the filter;

[0018] Step 4: After the top and bottom filter positions are interchanged, release the transmission assembly of the rotating shaft and the connecting shaft, and limit the position of the connecting shaft through the transmission assembly, so that the connecting shaft limits the position of the filter through the rotating plate, and the filter can be replaced and cleaned during the use of the HVAC.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The HVAC filtering device connects a rotating shaft and a connecting shaft through a transmission assembly, the driving assembly drives the rotating shaft to rotate, the rotating shaft drives the connecting shaft to rotate through the transmission assembly, and the connecting shaft drives the filter screens on the upper and lower sides to interchange positions through a rotating plate, so that the clogged filter screen rotates to the bottom and the unused filter screen is located at the top, so that the clogged filter screen can be replaced, and the HVAC can still be used when the filter screen is replaced, thereby avoiding the filter screen clogging causing the air intake volume to be less than the air outlet volume, thereby avoiding the pressure difference between indoors and outdoors causing the external air to enter the room through the gap, and avoiding the need to stop the HVAC to replace the filter screen.

[0021] 2. When the filter of the HVAC filter device is replaced, the dust on the filter can be swept away by the cleaning brush in the cleaning assembly, thereby cleaning the dust blocking the filter and making the filter reusable. The swept away dust can be blocked by the protective cover and the isolation cover, thereby preventing the dust from spreading inside the HVAC air supply casing, thereby preventing the swept away dust from contaminating the filtered air in the HVAC air supply casing.

[0022] 3. The HVAC filter device collects dust swept by the cleaning component through a collecting component, so that the swept dust will not diffuse inside the protective cover and the isolation cover, avoiding the swept dust from re-attaching to the filter net, thereby avoiding the filter net being blocked again after cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a positive isometric drawing of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of a longitudinal section of the structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the drive assembly of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the transmission assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of the cleaning component structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the collection component of the present invention.

[0030] In the figure: 1. HVAC air supply housing; 2. drive motor; 3. bevel gear 1; 4. transmission shaft; 5. bevel gear 2; 6. rotating shaft; 7. mounting plate; 8. mounting rod; 9. moving plate; 10. transverse spring; 11. fixing ring; 12. connecting ring; 13. limiting circular groove; 14. limiting circular ring; 15. inserting rod; 16. connecting plate; 17. rotating sleeve; 18. connecting groove; 19. connecting strip; 20. connecting shaft; 21. locking plate; 22. locking plate; 23. connecting plate; 24. electromagnet; 25. rotating plate; 26. filter screen; 27. protective cover; 28. isolation cover; 29. ​​rectangular plate; 30. cleaning brush; 31. collecting box; 32. collecting box; 33. blocking net; 34. trapezoidal plate; 35. blocking plate; 36. vertical spring; 37. dust inlet pipe; 38. metal elastic sheet; 39. fan blade. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Reference Figure 1-3 A filtering device for HVAC and a method of using the same include a HVAC air supply housing 1, a driving assembly is provided on the top of the HVAC air supply housing 1, a rotating shaft 6 is provided inside the HVAC air supply housing 1 through the driving assembly, a mounting bracket is installed on the surface of the rotating shaft 6 through a bearing, and the mounting bracket is installed inside the HVAC air supply housing 1, a fan blade 39 is fixedly provided on the left end of the rotating shaft 6, a connecting shaft 20 is provided on the right side of the rotating shaft 6, a transmission assembly is provided on the left end of the connecting shaft 20 and the right end of the rotating shaft 6, the transmission assembly is used for connecting the rotating shaft 6 and the connecting shaft 20, a rotating plate 25 is fixedly provided on the right end of the connecting shaft 20, a filter screen 26 is fixedly provided on the upper and lower sides of the rotating plate 25, a cleaning assembly is provided on the surface of the filter screen 26, and the cleaning assembly is used to clean the replaced filter screen 26, and a collecting assembly for collecting cleaned dust is provided inside the HVAC air supply housing 1.

[0033] As a preferred implementation in this embodiment, refer to Figure 4As shown, the driving component includes a driving motor 2 fixedly mounted on the top of the HVAC air supply casing 1, and the output end of the driving motor 2 is provided with a bevel gear 3, and the output end of the driving motor 2 is connected to the transmission shaft 4 through the bevel gear 3, and the number of bevel gears 3 is two, and the two bevel gears 3 are respectively fixedly mounted on the output end of the driving motor 2 and the top of the transmission shaft 4, and the bottom end of the transmission shaft 4 is provided with a bevel gear 2 5, and the number of bevel gears 2 5 is two, and the two bevel gears 2 5 are respectively fixedly mounted on the bottom end of the transmission shaft 4 and the surface of the rotating shaft 6, and the driving motor 2 drives the transmission shaft 4 to rotate through the bevel gear 3, and the transmission shaft 4 drives the rotating shaft 6 to rotate through the bevel gear 2 5, so that the rotating shaft 6 drives the fan blades 39 to rotate, and the external air is drawn into the HVAC air supply casing 1.

[0034] As a preferred implementation in this embodiment, refer to Figure 5As shown, the transmission assembly includes a mounting plate 7 fixedly mounted inside the HVAC air supply housing 1, a mounting rod 8 is fixedly mounted on the left end of the mounting plate 7, a moving plate 9 is slidably mounted on the surface of the mounting rod 8, a transverse spring 10 is connected between the right side of the moving plate 9 and the left side of the mounting plate 7, a connecting plate 23 is arranged on the left side of the moving plate 9, the connecting plate 23 is fixedly mounted inside the HVAC air supply housing 1, an electromagnet 24 is fixedly mounted on the right side of the connecting plate 23, a fixing ring 11 is fixedly mounted on the bottom of the moving plate 9, a limited circular groove 13 is arranged inside the fixing ring 11, a limited circular ring 14 is rotatably arranged inside the limited circular groove 13, and a limited circular ring 14 is arranged inside the limited circular groove 13. A connecting ring 12 is fixedly provided on the top, and an insertion rod 15 is fixedly provided on both sides of the connecting ring 12. A connecting disk 16 and a locking disk 21 are respectively provided on the left and right sides of the connecting ring 12. Limiting holes are provided on the surfaces of the connecting disk 16 and the locking disk 21. The number of limiting holes is several. The connecting disk 16 is fixedly installed on the right end of the rotating shaft 6. A rotating sleeve 17 is rotatably provided inside the locking disk 21. A connecting groove 18 is provided inside the rotating sleeve 17 and inside the connecting ring 12. A connecting strip 19 is slidably provided inside the connecting groove 18. The connecting strip 19 is fixedly installed on the surface of the connecting shaft 20. A locking plate 2 is fixedly provided on the surface of the locking disk 21. 2. The locking plate 22 is fixedly mounted on the bottom of the mounting plate 7. The electromagnet 24 adsorbs the movable plate 9 on its surface. When the movable plate 9 drives the connecting ring 12 to the left through the fixing ring 11, the limiting circular groove 13 and the limiting circular ring 14, the insertion rod 15 on the left is inserted into the limiting hole of the connecting plate 16. The rotating shaft 6 drives the insertion rod 15 to move through the connecting plate 16, so that the connecting ring 12 drives the connecting shaft 20 to rotate through the rotating sleeve 17, the connecting groove 18 and the connecting strip 19, so that the connecting shaft 20 drives the filter screens 26 on the upper and lower sides to interchange positions through the rotating plate 25. When the filter screen 26 is replaced, the electromagnet 24 is turned on. When the power is turned off, the transverse spring 10 drives the fixed ring 11 to move to the right through the movable plate 9, and the fixed ring 11 drives the connecting ring 12 to move to the right through the limiting circular groove 13 and the limiting circular ring 14. The connecting ring 12 drives the insertion rod 15 on the right to insert into the limiting hole of the locking disk 21, so that the locking disk 21 locks the position of the connecting ring 12, and the connecting ring 12 locks the position of the rotating sleeve 17. The rotating sleeve 17 locks the position of the connecting shaft 20 through the connecting groove 18 and the connecting strip 19, so that the rotating plate 25 locks the position of the filter screen 26, so as to avoid the displacement of the filter screen 26 during use.

[0035] As a preferred implementation in this embodiment, refer to Figure 6As shown, the cleaning component includes a protective cover 27 and an isolation cover 28 overlapped on the left and right sides of the rotating plate 25, the isolation cover 28 and the protective cover 27 are both semicircular structures, the top of the isolation cover 28 is provided with a semicircular groove for connecting with the connecting shaft 20, the isolation cover 28 and the protective cover 27 are both made of metal material, and the protective cover 27 and the isolation cover 28 are both fixedly installed inside the HVAC air supply shell 1, a rectangular plate 29 is fixedly provided on the upper side wall of the protective cover 27, a cleaning brush 30 is fixedly provided at the bottom of the rectangular plate 29, the cleaning brush 30 is in contact with the filter screen 26 below, and a filter screen is fixedly provided inside the protective cover 27. When the filter screen 26 with dust attached to the top moves to the inside of the protective cover 27, the dust attached to the surface of the filter screen 26 is swept off by the cleaning brush 30 inside the protective cover 27, and the dust is blocked by the protective cover 27 and the isolation cover 28, while the external air enters the inside of the protective cover 27 after being filtered by the filter screen.

[0036] As a preferred implementation in this embodiment, refer to Figure 7As shown, the collection assembly includes a collection box 31 fixedly installed inside the HVAC air supply housing 1, a collection box 32 is slidably arranged inside the collection box 31, a blocking net 33 is fixedly arranged inside the collection box 32, a trapezoidal plate 34 is fixedly arranged on the rear side of the collection box 32, a blocking plate 35 is overlapped on the top of the trapezoidal plate 34, a vertical spring 36 is connected between the upper side wall of the blocking plate 35 and the top of the blocking net 33, and installation grooves are opened on both sides of the collection box 32, and a metal elastic sheet is fixedly arranged inside the installation groove. 38, the left and right side walls of the collection box 31 are both provided with hemispherical grooves adapted to the metal elastic sheet 38, and a dust inlet pipe 37 is fixedly arranged on the top of the collection box 31, and the inlet end of the dust inlet pipe 37 penetrates the HVAC air supply housing 1 and extends to the inside of the protective cover 27. Under the action of the fan blades 39 extracting external air, the dust diffused in the protective cover 27 enters the dust inlet pipe 37, and enters the collection box 31 through the dust inlet pipe 37, and the dust is blocked by the blocking net 33 inside the collection box 32. The dust falls into the collection box 32. When the dust collection is completed, the collection box 32 is taken out from the collection box 31, so that the fixed hemisphere on the metal elastic sheet 38 is moved out of the hemispherical groove, and the collection box 32 and the blocking net 33 are taken out from the collection box 31. The collection box 32 and the blocking net 33 can be cleaned. At the same time, the vertical spring 36 pulls the blocking plate 35 to move upward, so that the blocking plate 35 blocks the collection box 31, so that the dust will not enter the HVAC air supply outlet through the collection box 31. The inside of the shell 1 is prevented from dust contaminating the filtered clean air. When the dust on the filter screen 26 needs to be cleaned and collected again, the collecting box 32 is inserted into the collecting box 31, so that the trapezoidal plate 34 is inserted into the bottom of the sealing plate 35 through the inclined surface, so that the trapezoidal plate 34 pushes the sealing plate 35 to move upward, so that the sealing plate 35 stretches the vertical spring 36, so that the sealing plate 35 is opened, and the swept dust can be collected through the extraction effect of the rotation of the fan blades 39.

[0037] A method for using a filter device for HVAC, comprising the following steps:

[0038] Step 1: The driving assembly drives the rotating shaft 6 to drive the fan blades 39 to rotate. Under the action of the fan blades 39, the external air enters the HVAC air supply housing 1. As the air moves to the left in the HVAC air supply housing 1, the filter 26 filters the incoming air.

[0039] Step 2: When the filter screen 26 on the top of the rotating plate 25 is clogged due to excessive dust, the rotating shaft 6 and the connecting shaft 20 are connected by the transmission assembly, so that when the driving assembly drives the rotating shaft 6 to rotate, the rotating shaft 6 can drive the connecting shaft 20 to rotate through the transmission assembly, and drive the rotating plate 25 to rotate through the connecting shaft 20, so that the rotating plate 25 drives the filter screen 26 to move, so that the positions of the top and bottom filter screens 26 are interchanged, and during the process of interchanging the positions of the filter screens 26, the cleaning assembly sweeps off the dust attached to the filter screen 26;

[0040] Step 3: After the dust attached to the filter 26 is cleaned, the fan blades 39 rotate to extract air, so that the cleaned dust enters the collection component, and the cleaned dust is collected by the collection component to prevent the cleaned dust from reattaching to the filter 26;

[0041] Step 4: After the positions of the top and bottom filters 26 are interchanged, release the transmission assembly of the rotating shaft 6 and the connecting shaft 20, and limit the position of the connecting shaft 20 through the transmission assembly, so that the connecting shaft 20 limits the position of the filter 26 through the rotating plate 25, and the filter 26 can be replaced and cleaned during the use of the HVAC.

[0042] During use: when the clogged filter screen 26 needs to be replaced and cleaned, the electromagnet 24 is energized so that the electromagnet 24 adsorbs the movable plate 9 on its surface, so that the movable plate 9 stretches the transverse spring 10, and at the same time, when the movable plate 9 drives the fixed ring 11 to the left, the fixed ring 11 drives the connecting ring 12 to the left through the limiting circular groove 13 and the limiting circular ring 14, and drives the insertion rod 15 to the left through the connecting ring 12, so that the insertion rod 15 on the left is inserted into the limiting hole of the connecting disk 16, and at the same time, the driving motor 2 drives the transmission shaft 4 to rotate through the bevel gear 1 3, and the transmission shaft 4 drives the rotating shaft 6 to rotate through the bevel gear 2 5, and the rotating shaft 6 drives the insertion rod 15 to move through the connecting disk 16, and drives the connecting ring 12 to rotate inside the limiting circular groove 13 through the limiting circular ring 14 through the insertion rod 15. The connecting ring 12 drives the rotating sleeve 17 to rotate inside the locking disk 21, and the rotating sleeve 17 drives the connecting shaft 20 to rotate through the connecting groove 18 and the connecting strip 19, so that the connecting shaft 20 drives the filter screen 26 to rotate through the rotating plate 25, so that the positions of the filter screens 26 on the upper and lower sides are interchanged. When the filter screen 26 with dust attached to the top moves to the inside of the protective cover 27, the dust attached to the surface of the filter screen 26 is swept away by the cleaning brush 30 inside the protective cover 27, and the swept away dust will diffuse inside the protective cover 27. Under the action of the fan blades 39 to extract external air, the diffused dust inside the protective cover 27 enters the dust inlet pipe 37, and enters the collection box 31 through the dust inlet pipe 37, and is blocked by the blocking net 33 inside the collection box 32, so that the dust falls into the collection box 32.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A filter device for a heating, ventilation and air conditioning system, comprising a heating, ventilation and air conditioning air supply housing (1), characterized in that: A driving assembly is arranged at the top of the HVAC air supply housing (1); a rotating shaft (6) is arranged inside the HVAC air supply housing (1) through the driving assembly; a mounting frame is mounted on the surface of the rotating shaft (6) through a bearing; the mounting frame is mounted inside the HVAC air supply housing (1); a fan blade (39) is fixedly arranged at the left end of the rotating shaft (6); a connecting shaft (20) is arranged on the right side of the rotating shaft (6); a transmission assembly is arranged at the left end of the connecting shaft (20) and the right end of the rotating shaft (6); the transmission assembly is used for connecting the rotating shaft (6) and the connecting shaft (20); a rotating plate (25) is fixedly arranged at the right end of the connecting shaft (20); a filter screen (26) is fixedly arranged on both the upper and lower sides of the rotating plate (25); a cleaning assembly is arranged on the surface of the filter screen (26); the cleaning assembly is used for cleaning the replaced filter screen (26); and a collecting assembly for collecting cleaned dust is arranged inside the HVAC air supply housing (1).

2. A filter device for HVAC according to claim 1, characterized in that: The drive assembly comprises a drive motor (2) fixedly mounted on the top of a HVAC air supply housing (1); the output end of the drive motor (2) is provided with a bevel gear 1 (3); the output end of the drive motor (2) is connected to a transmission shaft (4) via the bevel gear 1 (3); the number of the bevel gear 1 (3) is two, and the two bevel gears 1 (3) are respectively fixedly mounted on the output end of the drive motor (2) and the top of the transmission shaft (4); the bottom end of the transmission shaft (4) is provided with a bevel gear 2 (5); the number of the bevel gear 2 (5) is two, and the two bevel gears 2 (5) are respectively fixedly mounted on the bottom end of the transmission shaft (4) and the surface of the rotating shaft (6).

3. A filter device for HVAC according to claim 1, characterized in that: The transmission assembly comprises a mounting plate (7) fixedly mounted inside the HVAC air supply housing (1); a mounting rod (8) is fixedly mounted on the left end of the mounting plate (7); a movable plate (9) is slidably mounted on the surface of the mounting rod (8); a transverse spring (10) is connected between the right side of the movable plate (9) and the left side of the mounting plate (7); a connecting plate (23) is arranged on the left side of the movable plate (9); the connecting plate (23) is fixedly mounted inside the HVAC air supply housing (1); an electromagnet (24) is fixedly mounted on the right side of the connecting plate (23); a fixing ring (11) is fixedly mounted on the bottom of the movable plate (9); a limiting circular groove (13) is provided inside the fixing ring (11); a limiting circular ring (14) is rotatably arranged inside the limiting circular groove (13); the limiting circular ring (14) is rotatably mounted inside the limiting circular groove (13); A connecting ring (12) is fixedly arranged inside the circular ring (14), and insertion rods (15) are fixedly arranged on both the left and right sides of the connecting ring (12). A connecting disk (16) and a locking disk (21) are respectively arranged on the left and right sides of the connecting ring (12), and the connecting disk (16) is fixedly mounted on the right end of the rotating shaft (6). A rotating sleeve (17) is rotatably arranged inside the locking disk (21). A connecting groove (18) is provided inside the rotating sleeve (17) and inside the connecting ring (12), and a connecting strip (19) is slidably arranged inside the connecting groove (18). The connecting strip (19) is fixedly mounted on the surface of the connecting shaft (20). A locking plate (22) is fixedly arranged on the surface of the locking disk (21), and the locking plate (22) is fixedly mounted on the bottom of the mounting plate (7).

4. A filter device for HVAC according to claim 1, characterized in that: The cleaning assembly comprises a protective cover (27) and an isolation cover (28) which are overlapped and arranged on the left and right sides of the rotating plate (25); the protective cover (27) and the isolation cover (28) are both fixedly installed inside the HVAC air supply housing (1); a rectangular plate (29) is fixedly arranged on the upper side wall of the protective cover (27); a cleaning brush (30) is fixedly arranged on the bottom of the rectangular plate (29); the cleaning brush (30) is in contact with the filter screen (26) below; and a filter screen is fixedly arranged inside the protective cover (27).

5. The HVAC filter device according to claim 1, characterized in that: The collecting assembly comprises a collecting box (31) fixedly mounted inside a heating and ventilation air conditioning air supply housing (1); a collecting box (32) is slidably arranged inside the collecting box (31); a blocking net (33) is fixedly arranged inside the collecting box (32); a trapezoidal plate (34) is fixedly arranged on the rear side of the collecting box (32); a blocking plate (35) is overlapped on the top of the trapezoidal plate (34); a vertical spring (36) is connected between the upper side wall of the blocking plate (35) and the top of the blocking net (33); mounting grooves are provided on both left and right sides of the collecting box (32); a metal elastic sheet (38) is fixedly arranged inside the mounting groove; hemispherical grooves matching the metal elastic sheet (38) are provided on both left and right side walls of the collecting box (31); a dust inlet pipe (37) is fixedly arranged on the top of the collecting box (31); the inlet end of the dust inlet pipe (37) passes through the heating and ventilation air conditioning air supply housing (1) and extends to the inside of the protective cover (27).

6. A HVAC filter device according to claim 3, characterized in that: Limiting holes are provided through the surfaces of the connection disk (16) and the locking disk (21), and the number of the limiting holes is a plurality.

7. A filter device for HVAC according to claim 4, characterized in that: The isolation cover (28) and the protective cover (27) are both semicircular in structure, a semicircular groove for connecting to the connecting shaft (20) is provided on the top of the isolation cover (28), and the isolation cover (28) and the protective cover (27) are both made of metal.

8. A method for using a filter device for HVAC according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: The driving assembly drives the rotating shaft (6) to drive the fan blades (39) to rotate, and under the action of the fan blades (39), external air enters the interior of the HVAC air supply housing (1), and as the air moves to the left in the HVAC air supply housing (1), the filter (26) filters the incoming air; Step 2: When the filter screen (26) at the top of the rotating plate (25) is clogged due to excessive dust adhering to the surface, the rotating shaft (6) and the connecting shaft (20) are connected via a transmission assembly, so that when the driving assembly drives the rotating shaft (6) to rotate, the rotating shaft (6) can drive the connecting shaft (20) to rotate via the transmission assembly, and drive the rotating plate (25) to rotate via the connecting shaft (20), so that the rotating plate (25) drives the filter screen (26) to move, so that the positions of the top and bottom filter screens (26) are interchanged, and during the process of the interchange of the positions of the filter screens (26), the cleaning assembly sweeps off the dust adhering to the filter screen (26); Step 3: After the dust attached to the filter (26) is cleaned and swept away, the fan blades (39) rotate to draw air, so that the cleaned dust enters the interior of the collection component, and the cleaned dust is collected by the collection component, preventing the cleaned dust from reattaching to the filter (26); Step 4: After the top and bottom filters (26) are interchanged, the transmission assembly for the rotating shaft (6) and the connecting shaft (20) is released, and the position of the connecting shaft (20) is limited by the transmission assembly, so that the connecting shaft (20) limits the position of the filter (26) through the rotating plate (25), and the filter (26) can be replaced and cleaned during the use of the HVAC.

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