Back-blowing dust removal structure of dust collector

Abstract

The utility model relates to the field of dust collectors, in particular to a blowback dust removal structure of a dust collector. A back-blowing dust removal structure of a dust collector comprises a dust collector motor, a motor base, a HEPA filter element, an air duct switching assembly and an air door assembly. The air duct switching assembly is provided with a manual handle used for driving the air duct switching assembly to move and / or an air door switching driving motor. The air door assembly comprises an upper air door blocking piece, a lower air door blocking piece, an air door linkage piece and a reset spring. The dust collector has the advantages that the dust collector does not need to be disassembled or shut down, reverse blowing dust removal is achieved by means of wind power of the motor of the dust collector in normal work, and the HEPA filter element is automatically or manually cleaned; the air duct switching assembly switches the flow direction of the air flow of the dust collector through the movement of a driving motor or a manual handle, so that reverse blowing of the HEPA filter element is realized, and the purpose of reverse blowing dust removal is achieved; the airflow in the barrel is in a closed circulation state in a back-blowing state, so that the stability of air pressure in the dust collection barrel in a whole machine working state is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of vacuum cleaners, in particular to a vacuum cleaner back-blowing dust removal structure which does not require additional back-blowing power and relies on a vacuum cleaner motor of the vacuum cleaner itself as power. Background Art

[0002] When the vacuum cleaner is working, dust will adhere to the HEPA filter element, causing the filter to be blocked. If the HEPA filter element is not cleaned in time, it will affect the working efficiency and service life of the vacuum cleaner. Utility Model Content

[0003] The purpose of the utility model is to provide a dust removal structure for a vacuum cleaner with reverse blowing to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A dust removal structure for back-blowing of a vacuum cleaner comprises: a vacuum cleaner motor, a motor seat, a HEPA filter element, an air duct switching assembly and an air door assembly; the air duct switching assembly is used to drive the air door assembly to move; the air duct switching assembly is provided with a manual handle and / or an air door switching driving motor for driving the air duct switching assembly to move; the air door assembly comprises: an upper air door stopper, a lower air door stopper, an air door linkage, and a return spring; the motor seat is formed with a dust suction air outlet channel, an air inlet channel and a back-blowing air channel; the air duct switching assembly is formed with an air duct switching assembly ventilation hole; the upper air door stopper is formed with an upper air door stopper ventilation hole; the lower air door stopper is formed with a lower air door stopper ventilation hole;

[0006] The upper air door baffle has an upper air door baffle dust suction position and an upper air door baffle back-blowing position; the upper air door baffle moves between the upper air door baffle dust suction position and the upper air door baffle back-blowing position;

[0007] The lower air door stopper has a lower air door stopper dust suction position and a lower air door stopper back-blowing position; the lower air door stopper moves between the lower air door stopper dust suction position and the lower air door stopper back-blowing position;

[0008] When the air duct switching component overcomes the force of the return spring under the external force and moves the upper air door stopper from the upper air door stopper dust suction position to the upper air door stopper back-blowing position, the upper air door stopper drives the lower air door stopper from the lower air door stopper dust suction position to the lower air door stopper back-blowing position through the air door linkage member;

[0009] When there is no external force on the air duct switching assembly, the reset spring drives the upper air door stopper from the upper air door stopper back-blowing position to the upper air door stopper dust suction position, the upper air door stopper drives the air duct switching assembly to reset, and the upper air door stopper drives the lower air door stopper from the lower air door stop back-blowing position to the lower air door stopper dust suction position through the air door linkage member;

[0010] During vacuuming operation, the ventilation holes of the air duct switching assembly are aligned with the vacuum outlet passage to open the vacuum outlet passage, the upper air door stopper is located at the upper air door stopper vacuuming position, the upper air door stopper blocks the back-blowing passage, the lower air door stopper is located at the lower air door stopper vacuuming position, and the ventilation holes of the lower air door stopper are aligned with the air inlet passage to open the air inlet passage;

[0011] During vacuuming, driven by the vacuum cleaner motor, the airflow passes through the HEPA filter element, the air inlet channel, the vacuum cleaner motor and the vacuum outlet channel in sequence;

[0012] During back-blowing dust removal, the ventilation holes of the air duct switching assembly are staggered with the dust suction outlet passage, the air duct switching assembly blocks the dust suction outlet passage, the upper air door stopper is located at the upper air door stopper back-blowing position, the ventilation holes of the upper air door stopper are aligned with the back-blowing passage to open the back-blowing passage, the lower air door stopper is located at the lower air door stopper dust suction position, and the lower air door stopper blocks part of the air inlet passage;

[0013] During back-blowing dust removal, driven by the vacuum cleaner motor, the airflow passes through the HEPA filter element, the unblocked air inlet channel, the vacuum cleaner motor and the back-blowing channel in sequence, and the airflow blows from the back-blowing channel to the HEPA filter element.

[0014] As a further solution of the utility model: the air door assembly also includes: a hook member and a hook return spring; the hook member is rotatably installed to the air duct switching assembly; the motor seat is formed with a slope surface and a butt surface; when the air duct switching assembly pushes the upper air door stop from the upper air door stop dust suction position to the upper air door stop back blowing position, the hook member slides along the slope surface to the butt surface, overcomes the rotation of the hook return spring, and hooks the upper air door stop; when the air duct switching assembly moves in the opposite direction for reset, the air duct switching assembly drives the upper air door stop from the upper air door stop back blowing position to the upper air door stop dust suction position through the hook member, and when the hook member moves from the butt surface to the slope surface, the hook member rotates under the action of the hook return spring and disengages from the position of hooking the upper air door stop.

[0015] As a further solution of the utility model: the upper air door stopper is formed with a driving column; the air duct switching assembly is formed with a pushing block; the pushing block contacts one side of the driving column, so that the air duct switching assembly pushes the upper air door stopper to move; the hook is used to hook the other side of the driving column, so that the air duct switching assembly drives the upper air door stopper to move in the opposite direction.

[0016] As a further solution of the utility model: there are two damper assemblies; the two damper assemblies are symmetrically arranged on both sides of the vacuum cleaner motor; the back-blowing channel blocked by the upper damper block of one damper assembly is toward one end of the HEPA filter element, and the back-blowing channel blocked by the upper damper block of the other damper assembly is toward the other end of the HEPA filter element.

[0017] As a further solution of the utility model: when the air duct switching assembly moves in one direction to push one of the two damper assemblies to move, one of the two damper assemblies breaks away from the contact with the air duct switching assembly and remains stationary.

[0018] As a further solution of the utility model: the lower air damper block of one of the two air damper assemblies is used to block part of the air inlet channel; the lower air damper block of the other of the two air damper assemblies is used to block another part of the air inlet channel; when the upper air damper block of one of the two air damper assemblies opens the back-blowing channel, the lower air damper block of the other of the two air damper assemblies opens the air inlet channel; the opened air inlet channel is located on the side of the vacuum cleaner motor away from the open back-blowing channel.

[0019] As a further solution of the utility model: the air duct switching assembly is rotatably mounted to the motor base; when the air duct switching assembly rotates clockwise, it pushes one of the two damper assemblies to move, and when the air duct switching assembly rotates counterclockwise, it pushes the other of the two damper assemblies to move.

[0020] As a further solution of the utility model: the motor seat is formed with an upper cavity; a lower cavity is formed between the motor seat and the HEPA filter element; the dust suction air outlet channel connects the upper cavity with the outside; the back-blowing channel connects the upper cavity and the lower cavity; the air inlet channel connects the lower cavity and the vacuum cleaner motor;

[0021] The motor base is formed with or mounted with a partition, which divides the lower cavity into two half cavities;

[0022] During back-blowing dust removal, driven by the vacuum cleaner motor, the upper chamber takes in air from one of the two half-chambers through the air inlet channel, and exhausts air to the other of the two half-chambers through the back-blowing channel, impacting the HEPA filter element;

[0023] The reverse blowing passages corresponding to the two air door components correspond to two different half chambers respectively.

[0024] As a further solution of the utility model: the air duct switching assembly, the upper air door stopper and the lower air door stopper are coaxially rotatably mounted on the motor base.

[0025] As a further solution of the utility model: the damper linkage is rotatably mounted to the motor base; the upper damper block is formed with an upper rack; the lower damper block is formed with a lower rack; the damper linkage is provided with an upper gear portion and a lower gear portion respectively meshing with the upper rack and the lower rack.

[0026] The utility model is beneficial in that it does not require disassembly of the machine or an additional power device, and utilizes the design of the air duct switching in the structure of the utility model to change the wind direction of the vacuum cleaner motor and the airflow channel through manual or electric switching to achieve backblowing dust removal on the HEPA filter element.

[0027] Other features and advantages of the present invention will be disclosed in detail in the following specific implementations and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of a dust removal structure of a vacuum cleaner as an embodiment of the utility model;

[0029] Figure 2 yes Figure 1 A front view of the back-blowing dust removal structure of the vacuum cleaner;

[0030] Figure 3 yes Figure 2 A right side view of the back-blowing dust removal structure of the vacuum cleaner;

[0031] Figure 4 yes Figure 3 A cross-sectional view of the dust removal structure of the vacuum cleaner along line AA, wherein the arrows show the airflow movement path during the vacuuming operation;

[0032] Figure 5 yes Figure 4 Schematic diagram of the structure, wherein the solid arrow and the dotted arrow respectively show two airflow movement paths after the air duct switching component rotates clockwise and counterclockwise during back-blowing dust removal;

[0033] Figure 6 yes Figure 1 Bottom view of the vacuum cleaner back-blowing dust removal structure after removing part of the motor base, HEPA filter element and partition;

[0034] Figure 7 yes Figure 6 A top view of the structure in the middle;

[0035] Figure 8 yes Figure 7 Schematic diagram of the middle structure with the vacuum cleaner motor and the damper switching drive motor removed;

[0036] Fig. 9 yes Figure 8 Stereoscopic view of the mesostructure;

[0037] Fig.10 yes Fig. 9 A partial enlarged view of point B in the middle structure.

[0038] List of reference numerals: vacuum cleaner back-blowing dust removal structure 100, vacuum cleaner motor 10, motor seat 20, dust suction air outlet channel 21, air inlet channel 22, back-blowing air channel 23, slope surface 24, abutment surface 25, upper chamber 201, half chamber 202, partition 203, HEPA filter element 30, air duct switching assembly 40, manual handle 401, air door switching drive motor 402, air duct switching assembly ventilation hole 41, push block 42, air door assembly 50, upper air door stop 51, upper air door stop ventilation hole 511, drive column 512, lower air door stop 52, lower air door stop ventilation hole 521, air door linkage member 53, return spring 54, lift hook member 55, lift hook return spring 56. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figures 1 to 10 As shown, a vacuum cleaner back-blowing dust removal structure 100 includes: a vacuum cleaner motor 10, a motor base 20, a HEPA filter element 30, an air duct switching assembly 40 and a damper assembly 50.

[0041] Taking a barrel type vacuum cleaner as an example, the motor base 20 covers the barrel body of the vacuum cleaner. When the vacuum cleaner motor 10 is working, the dust is filtered by the HEPA filter element 30 and retained in the barrel body of the vacuum cleaner.

[0042] The air duct switching assembly 40 is used to drive the damper assembly 50 to move. The air duct switching assembly 40 is provided with a manual handle 401 and / or a damper switching drive motor 402. The air duct switching assembly 40 can be driven manually or automatically. A manual handle 401 is provided on the air duct switching assembly 40, and the user moves the manual handle 401 to make the air duct switching assembly 40 move to achieve manual driving. The air duct switching assembly 40 can be provided with a damper switching drive motor 402. The damper switching drive motor 402 is used to drive the air duct switching assembly 40 to move, thereby achieving automatic driving. The damper switching drive motor 402 can drive the air duct switching assembly 40 to move by gear transmission.

[0043] The damper assembly 50 includes: an upper damper stopper 51, a lower damper stopper 52, a damper linkage 53, and a return spring 54. The motor base 20 is formed with a dust suction air outlet channel 21, an air inlet channel 22, and a back-blowing air channel 23. The air duct switching assembly 40 is formed with an air duct switching assembly vent 41. The upper damper stopper 51 is formed with an upper damper stopper vent 511. The lower damper stopper 52 is formed with a lower damper stopper vent 521.

[0044] The upper damper 51 has an upper damper dust suction position and an upper damper blowback position. The upper damper 51 moves between the upper damper dust suction position and the upper damper blowback position. The lower damper 52 has a lower damper dust suction position and a lower damper blowback position. The lower damper 52 moves between the lower damper dust suction position and the lower damper blowback position.

[0045] When the air duct switching assembly 40 overcomes the force of the return spring 54 under the external force and pushes the upper air damper stop 51 to move from the upper air damper stop dust suction position to the upper air damper stop back blowing position, the upper air damper stop 51 drives the lower air damper stop 52 to move from the lower air damper stop dust suction position to the lower air damper stop back blowing position through the air damper linkage 53.

[0046] When there is no external force acting on the air duct switching assembly 40, the return spring 54 drives the upper air door stop 51 to move from the upper air door stop back-blowing position to the upper air door stop dust suction position, the upper air door stop 51 drives the air duct switching assembly 40 to reset, and the upper air door stop 51 drives the lower air door stop 52 to move from the lower air door stop back-blowing position to the lower air door stop dust suction position through the air door linkage 53.

[0047] During vacuuming operation, the ventilation hole 41 of the air duct switching assembly is aligned with the dust suction outlet channel 21 to open the dust suction outlet channel 21, the upper air door block 51 is located at the upper air door block dust suction position, the upper air door block 51 blocks the back-blowing air channel 23, the lower air door block 52 is located at the lower air door block dust suction position, and the ventilation hole 521 of the lower air door block is aligned with the air inlet channel 22 to open the air inlet channel 22.

[0048] During vacuuming operation, driven by the vacuum cleaner motor 10 , the airflow sequentially passes through the HEPA filter element 30 , the air inlet channel 22 , the vacuum cleaner motor 10 and the vacuum outlet channel 21 .

[0049] During back-blowing dust removal, the ventilation holes 41 of the air duct switching assembly are staggered with the dust suction outlet channel 21, the air duct switching assembly 40 blocks the dust suction outlet channel 21, the upper air door block 51 is located at the upper air door block back-blowing position, the upper air door block ventilation holes 511 are aligned with the back-blowing air channel 23 to open the back-blowing air channel 23, and the lower air door block 52 is located at the lower air door block dust suction position, and the lower air door block 52 partially blocks the air inlet channel 22.

[0050] During back-blowing dust removal, driven by the vacuum cleaner motor 10 , the airflow passes through the HEPA filter element 30 , the unblocked part of the air inlet channel 22 , the vacuum cleaner motor 10 and the back-blowing channel 23 in sequence, and the airflow blows from the back-blowing channel 23 toward the HEPA filter element 30 .

[0051] As a specific embodiment, the air door assembly 50 further includes: a hook 55 and a hook return spring 56. The hook 55 is rotatably mounted to the air duct switching assembly 40. The motor seat 20 is formed with a slope surface 24 and an abutment surface 25. When the air duct switching assembly 40 pushes the upper air door stop 51 to move from the upper air door stop dust suction position to the upper air door stop back blowing position, the hook 55 slides along the slope surface 24 to the abutment surface 25, overcomes the rotation of the hook return spring 56, and hooks the upper air door stop 51. When the air duct switching assembly 40 moves in the opposite direction to reset, the air duct switching assembly 40 drives the upper air door stop 51 from the upper air door stop back blowing position to the upper air door stop dust suction position through the hook 55. When the hook 55 moves from the abutment surface 25 to the slope surface 24, the hook 55 rotates under the action of the hook return spring 56 and disengages from the position of hooking the upper air door stop 51.

[0052] The setting of the hook member 55 and the hook reset spring 56 allows the manual or automatic reset of the air duct switching assembly 40 to drive the upper air door stop 51 to reset, preventing the reset spring 54 from decreasing its elastic force after long-term use and causing a reset failure of the upper air door stop 51.

[0053] As a specific embodiment, the upper air damper stopper 51 is formed with a driving column 512. The air duct switching assembly 40 is formed with a pushing block 42. The pushing block 42 contacts one side of the driving column 512, so that the air duct switching assembly 40 pushes the upper air damper stopper 51 to move. The hook 55 is used to hook the other side of the driving column 512, so that the air duct switching assembly 40 drives the upper air damper stopper 51 to move in the reverse direction.

[0054] The return spring 54 is a tension spring. The upper air door stopper 51 and the motor seat 20 are both provided with tension spring hanging columns. The two ends of the tension spring hook the tension spring hanging columns. The hook return spring 56 is a compression spring, and the two ends of the compression spring abut against the push block 42 and the hook member 55 respectively.

[0055] As a specific implementation, there are two damper assemblies 50. The two damper assemblies 50 are symmetrically arranged on both sides of the vacuum cleaner motor 10. The reverse air flow passage 23 blocked by the upper damper stopper 51 of one damper assembly 50 faces one end of the HEPA filter element 30, and the reverse air flow passage 23 blocked by the upper damper stopper 51 of the other damper assembly 50 faces the other end of the HEPA filter element 30.

[0056] As a specific implementation, when the air duct switching assembly 40 moves in one direction to push one of the two damper assemblies 50 to move, one of the two damper assemblies 50 breaks away from contact with the air duct switching assembly 40 and remains stationary.

[0057] As a specific embodiment, the motor base 20 is formed with an upper cavity. A lower cavity is formed between the motor base 20 and the HEPA filter element 30. The dust suction air outlet channel 21 connects the upper cavity with the outside. The back-blowing air channel 23 connects the upper cavity and the lower cavity. The air inlet channel 22 connects the lower cavity and the vacuum cleaner motor 10.

[0058] The motor base 20 is formed with or installed with a partition 203 , and the partition 203 divides the lower cavity into two half cavities 202 .

[0059] During back-blowing dust removal, driven by the vacuum cleaner motor 10 , the upper chamber 201 takes in air from one of the two half chambers 202 through the air inlet channel 22 , and exhausts air to the other of the two half chambers 202 through the back-blowing channel 23 , impacting the HEPA filter element 30 .

[0060] The reverse air blowing channels 23 corresponding to the two damper assemblies 50 correspond to two different half chambers 202 respectively.

[0061] After the right damper assembly 50 is activated, the right half chamber 202 opens the right back-blowing channel 23 due to the movement of the right upper damper stopper 51, and the air inlet channel 22 corresponding to the right half chamber 202 is blocked due to the movement of the right lower damper stopper 52. At this time, the left half chamber 202, because the left upper damper stopper 51 does not move, makes the corresponding back-blowing channel 23 not open and is in a blocked state, and the air inlet channel 22 corresponding to the left half chamber 202, because the left lower damper stopper 52 does not move, makes the air inlet channel 22 corresponding to the left half chamber 202 not blocked and is in an open state. At this time, air enters from the left air inlet channel 22, and then blows from the right back-blowing channel 23 to the right half chamber 202, impacting the HEPA filter element 30 on this side. Similarly, after the damper assembly 50 on the left side is actuated, air is taken in from the air inlet channel 22 on the right side, and then blown from the back-blowing channel 23 on the left side to the left half chamber 202, impacting the HEPA filter element 30 on this side.

[0062] As a specific implementation, the lower damper stopper 52 of one of the two damper assemblies 50 is used to block part of the air inlet passage 22. The lower damper stopper 52 of the other of the two damper assemblies 50 is used to block another part of the air inlet passage 22. When the upper damper stopper 51 of one of the two damper assemblies 50 opens the reverse air passage 23, the lower damper stopper 52 of the other of the two damper assemblies 50 opens the air inlet passage 22; the opened air inlet passage 22 is located on the side of the vacuum cleaner motor 10 away from the opened reverse air passage 23.

[0063] As a specific implementation, the air duct switching assembly 40 is rotatably mounted to the motor base 20. When the air duct switching assembly 40 rotates clockwise, it pushes one of the two damper assemblies 50 to move, and when the air duct switching assembly 40 rotates counterclockwise, it pushes the other of the two damper assemblies 50 to move.

[0064] By rotating the air duct switching assembly 40 clockwise or counterclockwise, different back-blowing air channels 23 on both sides can be opened, so that back-blowing dust removal can be performed at different positions of the HEPA filter element 30 respectively.

[0065] As a specific embodiment, the air duct switching assembly 40, the upper air damper stopper 51 and the lower air damper stopper 52 are coaxially rotatably mounted on the motor base 20. As a specific embodiment, the air damper linkage member 53 is rotatably mounted on the motor base 20. The upper air damper stopper 51 is formed with an upper rack. The lower air damper stopper 52 is formed with a lower rack. The air damper linkage member 53 is provided with an upper gear portion and a lower gear portion respectively meshed with the upper rack and the lower rack.

[0066] As an optional implementation, the air duct switching assembly 40, the upper air door stopper 51 and the lower air door stopper 52 may also be installed to the motor base 20 in a linear sliding manner.

[0067] As an optional embodiment, the damper linkage may not be arranged to be rotatably mounted to the motor base 20. For example, the two ends of the damper linkage may be connected to the upper damper block and the lower damper block respectively. When the upper damper block moves, the damper linkage may drive the lower damper block to move.

[0068] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0069] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A dust removal structure (100) for a vacuum cleaner, characterized in that: include: A vacuum cleaner motor (10), a motor base (20), a HEPA filter element (30), an air duct switching assembly (40) and a damper assembly (50); the air duct switching assembly (40) is used to drive the damper assembly (50) to move; the air duct switching assembly (40) is provided with a manual handle (401) and / or a damper switching drive motor (402) for driving the air duct switching assembly (40) to move; the damper assembly (50) comprises: an upper damper stopper (51 ), a lower air door stopper (52), an air door linkage member (53), and a return spring (54); the motor base (20) is formed with a dust suction air outlet channel (21), an air inlet channel (22), and a back-blowing air channel (23); the air duct switching component (40) is formed with an air duct switching component ventilation hole (41); the upper air door stopper (51) is formed with an upper air door stopper ventilation hole (511); the lower air door stopper (52) is formed with a lower air door stopper ventilation hole (521); The upper damper block (51) has an upper damper block dust suction position and an upper damper block back-blowing position; the upper damper block (51) moves between the upper damper block dust suction position and the upper damper block back-blowing position; the lower damper block (52) has a lower damper block dust suction position and a lower damper block back-blowing position; the lower damper block (52) moves between the lower damper block dust suction position and the lower damper block back-blowing position; When the air duct switching component (40) overcomes the force of the return spring (54) under external force and moves the upper air damper stop (51) from the upper air damper stop dust suction position to the upper air damper stop back-blowing position, the upper air damper stop (51) drives the lower air damper stop (52) to move from the lower air damper stop dust suction position to the lower air damper stop back-blowing position via the air damper linkage component (53); When the air duct switching component (40) is free of external force, the return spring (54) drives the upper air damper stop (51) to move from the upper air damper stop back-blowing position to the upper air damper stop dust suction position, the upper air damper stop (51) drives the air duct switching component (40) to reset, and the upper air damper stop (51) drives the lower air damper stop (52) to move from the lower air damper stop back-blowing position to the lower air damper stop dust suction position via the air damper linkage component (53); During dust collection operation, the ventilation hole (41) of the air duct switching assembly is aligned with the dust collection air outlet channel (21) so that the dust collection air outlet channel (21) is open, the upper air door stopper (51) is located at the upper air door stopper dust collection position, the upper air door stopper (51) blocks the back-blowing air channel (23), the lower air door stopper (52) is located at the lower air door stopper dust collection position, and the ventilation hole (521) of the lower air door stopper is aligned with the air inlet channel (22) so that the air inlet channel (22) is open; During vacuuming operation, driven by the vacuum cleaner motor (10), airflow sequentially passes through the HEPA filter element (30), the air inlet channel (22), the vacuum cleaner motor (10) and the vacuum outlet channel (21); During back-blowing dust removal, the ventilation holes (41) of the air duct switching assembly are staggered with the dust suction outlet passage (21), the air duct switching assembly (40) blocks the dust suction outlet passage (21), the upper air door stopper (51) is located at the upper air door stopper back-blowing position, the ventilation holes (511) of the upper air door stopper are aligned with the back-blowing passage (23) so that the back-blowing passage (23) is open, the lower air door stopper (52) is located at the lower air door stopper dust suction position, and the lower air door stopper (52) blocks a portion of the air inlet passage (22); During back-blowing dust removal, driven by the vacuum cleaner motor (10), the airflow sequentially passes through the HEPA filter element (30), the unblocked portion of the air inlet channel (22), the vacuum cleaner motor (10), and the back-blowing channel (23), and the airflow is blown from the back-blowing channel (23) toward the HEPA filter element (30).

2. The dust removal structure (100) for a vacuum cleaner according to claim 1, characterized in that: The damper assembly (50) further comprises: a hook member (55) and a hook return spring (56); the hook member (55) is rotatably mounted on the air duct switching assembly (40); the motor seat (20) is formed with a slope surface (24) and an abutment surface (25); When the air duct switching assembly (40) pushes the upper air door stopper (51) to move from the upper air door stopper dust suction position to the upper air door stopper reverse blowing position, the hook member (55) slides along the slope surface (24) to the abutment surface (25), overcomes the rotation of the hook return spring (56), and hooks the upper air door stopper (51); When the air duct switching component (40) moves in the opposite direction to reset, the air duct switching component (40) drives the upper air door stop (51) to move from the upper air door stop back-blowing position to the upper air door stop dust suction position through the hook member (55); when the hook member (55) moves from the abutting surface (25) to the slope surface (24), the hook member (55) rotates under the action of the hook reset spring (56) and disengages from the position where it hooks the upper air door stop (51).

3. The dust removal structure (100) for a vacuum cleaner according to claim 2, characterized in that: The upper air door stopper (51) is formed with a driving column (512); the air duct switching component (40) is formed with a pushing block (42); the pushing block (42) contacts one side of the driving column (512), so that the air duct switching component (40) pushes the upper air door stopper (51) to move; the hook member (55) is used to hook the other side of the driving column (512), so that the air duct switching component (40) drives the upper air door stopper (51) to move in the opposite direction.

4. The dust removal structure (100) for a vacuum cleaner according to claim 1, characterized in that: The number of the damper assemblies (50) is two; the two damper assemblies (50) are symmetrically arranged on both sides of the vacuum cleaner motor (10); the reverse air flow passage (23) blocked by the upper damper stopper (51) of one damper assembly (50) faces one end of the HEPA filter element (30), and the reverse air flow passage (23) blocked by the upper damper stopper (51) of the other damper assembly (50) faces the other end of the HEPA filter element (30).

5. The dust removal structure (100) for a vacuum cleaner according to claim 4, characterized in that: When the air duct switching component (40) moves in one direction to push one of the two damper components (50) to move, one of the two damper components (50) breaks away from contact with the air duct switching component (40) and remains stationary.

6. The dust removal structure (100) for a vacuum cleaner according to claim 5, characterized in that: The lower air door stopper (52) of one of the two air door assemblies (50) is used to block a portion of the air inlet channel (22); the lower air door stopper (52) of the other of the two air door assemblies (50) is used to block another portion of the air inlet channel (22); when the upper air door stopper (51) of one of the two air door assemblies (50) opens the reverse air blowing channel (23), the lower air door stopper (52) of the other of the two air door assemblies (50) opens the air inlet channel (22); the opened air inlet channel (22) is located on a side of the vacuum cleaner motor (10) away from the opened reverse air blowing channel (23).

7. The dust removal structure (100) for a vacuum cleaner according to claim 5, characterized in that: The air duct switching assembly (40) is rotatably mounted to the motor base (20); when the air duct switching assembly (40) rotates clockwise, it pushes one of the two damper assemblies (50) to move, and when the air duct switching assembly (40) rotates counterclockwise, it pushes the other of the two damper assemblies (50) to move.

8. The dust removal structure (100) for a vacuum cleaner according to claim 5, characterized in that: The motor base (20) forms an upper cavity (201); a lower cavity is formed between the motor base (20) and the HEPA filter element (30); the dust suction air outlet channel (21) connects the upper cavity (201) with the outside; the reverse air blowing channel (23) connects the upper cavity (201) with the lower cavity; the air inlet channel (22) connects the lower cavity with the vacuum cleaner motor (10); The motor base (20) is formed with or installed with a partition (203), and the partition (203) divides the lower chamber into two half chambers (202); During back-blowing dust removal, driven by the vacuum cleaner motor (10), the upper chamber (201) takes in air from one of the two half chambers (202) through the air inlet channel (22), and exhausts air to the other of the two half chambers (202) through the back-blowing channel (23), thereby impacting the HEPA filter element (30); The reverse air blowing channels (23) corresponding to the two damper assemblies (50) respectively correspond to two different half chambers (202).

9. The dust removal structure (100) for a vacuum cleaner according to claim 1, characterized in that: The air duct switching assembly (40), the upper air door stopper (51), and the lower air door stopper (52) are coaxially rotatably mounted on the motor base (20).

10. The dust removal structure (100) for a vacuum cleaner according to claim 9, characterized in that: The damper linkage member (53) is rotatably mounted to the motor base (20); the upper damper stop member (51) is formed with an upper rack; the lower damper stop member (52) is formed with a lower rack; the damper linkage member (53) is provided with an upper gear portion and a lower gear portion respectively meshing with the upper rack and the lower rack.

Images