A dust filter device for a vacuum cleaner

Abstract

This application belongs to the field of vacuum cleaner manufacturing technology, specifically a dust filtration device for a vacuum cleaner, including a housing, a bottom cover, an inner drum, and a HEPA filter. The housing has openings at both the top and bottom. A preliminary filtration structure divides the housing into a first chamber and a second chamber. The inner drum is located within the second chamber. The bottom cover is sealed at the bottom of the housing, and a top plug that mates with the first dust outlet is provided on the bottom cover. A dust inlet is provided on the bottom cover and connects to the first chamber. An air inlet is located on the upper part of the side wall of the inner drum, connecting to the interior of the inner drum. An air outlet is located at the top of the inner drum. A HEPA filter is located on the top of the housing, with the lower end of the HEPA filter's air inlet lower than the air inlet. The axis of the air inlet is perpendicular to the central axis of the inner drum and at a predetermined distance. The air outlet of the HEPA filter is located outside the housing. This design solves the problem of the large size of traditional vacuum cleaner dust filtration devices.

Description

Technical Field

[0001] This application belongs to the field of vacuum cleaner manufacturing technology, specifically a dust filtration device for a vacuum cleaner. Background Technology

[0002] The dust filter in a handheld vacuum cleaner mainly separates the dust drawn into the vacuum cleaner from the air through multiple filtrations. However, the dust that needs to be emptied frequently after filtration is mainly from the first two dust-air separation processes. Therefore, the filter mainly consists of a first chamber and a second chamber. Although the two chambers are covered by a single cover for easy emptying, the dust inlet of the entire filter is usually located on the side wall of the first chamber. This is to allow the airflow carrying dust into the first chamber to rotate and retain large dust particles in the first chamber. As a result, traditional dust filters need to be connected to the vacuum cleaner through the dust inlet on the side wall of the first chamber, which leads to their large size. Summary of the Invention

[0003] The purpose of this application is to address the shortcomings of existing technologies by dividing the housing into a first chamber and a second chamber through a preliminary filtration structure, so that the dust inlet of the filter device is directly set on the bottom cover for dust discharge, thereby solving the problem of the large size of traditional dust filter devices in vacuum cleaners.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A dust filtration device for a vacuum cleaner includes a housing, a bottom cover, an inner tub, and a HEPA filter. The housing has openings at both its top and bottom. A preliminary filtration structure divides the housing into a first chamber and a second chamber. The inner tub is located within the second chamber. A first dust outlet is located at the bottom of the inner tub. The preliminary filtration structure has an opening that mates with the first dust outlet. The bottom cover is sealed at the bottom of the housing. A top plug mates with the first dust outlet on the bottom cover. A dust inlet is located on the bottom cover and connects to the first chamber. An air inlet communicating with the interior of the inner tub is located on the upper part of the side wall of the inner tub. An air outlet is located at the top of the inner tub. The HEPA filter is located at the top of the housing. The air inlet of the HEPA filter extends downwards from the top of the inner tub into the top of the inner tub. The lower end of the air inlet of the HEPA filter is lower than the air inlet. The axis of the air inlet is perpendicular to the central axis of the inner tub and at a predetermined distance. The air outlet of the HEPA filter is located outside the housing.

[0006] Preferably, the preliminary filtration structure includes a circular frame, a tubular frame, and a mesh body. The circular frame is coaxially disposed within the housing. The upper end of the tubular frame is coaxially and fixedly connected to the lower end face of the circular frame. The circular frame is coaxially provided with a circular through hole that mates with the tubular frame. The circular through hole is connected to the outer circumferential wall of the tubular frame. The mesh body is disposed on the portion of the circular frame outside the circular through hole. The mesh body is also disposed on the circumferential surface of the tubular frame. The inner diameter of the tubular frame is larger than the outer diameter of the lower end of the inner barrel. The lower part of the inner barrel extends coaxially into the lower end of the tubular frame. The inner circumferential wall of the lower end of the tubular frame is provided with a flange that is sealed and connected to the outer circumferential wall of the lower end of the inner barrel.

[0007] Preferably, the upper part of the inner tub is located above the circular frame, and the inner diameter of the upper part of the inner tub is larger than the inner diameter of the circular through hole.

[0008] Preferably, the top plug has a hollow interior with an opening facing downwards, and a second ash outlet is provided on the side wall of the top plug, which communicates with the first cavity. The ash inlet is the opening of the top plug, and the top of the top plug is engaged with the first ash outlet.

[0009] Preferably, the axis of the second ash outlet is perpendicular to the axis of the top plug, and there is a preset distance between the axis of the second ash outlet and the axis of the top plug.

[0010] Preferably, one end of the bottom cover is rotatably connected to the housing via a torsion spring, and the other end of the bottom cover is locked to the housing via a snap fastener.

[0011] Preferably, the HEPA filter includes a main frame tube, a filter element, and an extension tube. The extension tube is coaxially arranged at the lower end of the main frame tube. The outer diameter of the extension tube is smaller than the inner diameter of the upper part of the inner barrel. The extension tube extends into the inner barrel, and the lower end of the extension tube is lower than the air inlet of the inner barrel. The inner diameter of the main frame tube is larger than the outer diameter of the extension tube. The lower end of the main frame tube is sealed to the outer circumferential surface of the upper end of the extension tube through a connecting plate. The filter element is disposed at the upper part of the main frame tube, and there is a predetermined distance between the lower end of the filter element and the lower end of the main frame tube.

[0012] Preferably, the lower part of the main frame tube extends into the housing and is sealed to the inner circumferential surface of the housing. The upper end of the side wall of the main frame tube is provided with a cavity, and the tongue is located in the cavity. The lower end of the tongue is fixedly connected to the bottom of the cavity by a spring. When the spring is in the normal state, the upper end of the tongue is higher than the upper end of the main frame tube.

[0013] Compared with the prior art, the beneficial effects of this application are as follows:

[0014] This application uses a preliminary filtration structure to divide the housing into a first chamber and a second chamber, allowing the dust inlet of the filter device to be directly located on the bottom cover for dust removal, thus solving the problem of the large size of traditional dust filter devices in vacuum cleaners. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this application;

[0016] Figure 2 This is a cross-sectional schematic diagram of this application;

[0017] Figure 3 This is a schematic diagram of the bottom cover structure in this application;

[0018] Figure 4 for Figure 3 Schematic diagram of the bottom structure

[0019] Figure 5 This is a schematic diagram of the inner barrel structure in this application;

[0020] Figure 6 for Figure 4 A schematic diagram of the structure at the bottom center;

[0021] Figure 7 This is a schematic diagram of the preliminary filtering structure in this application;

[0022] Figure 8 for Figure 7 A schematic diagram of the top structure;

[0023] Figure 9 This is a schematic diagram of the structure of this application after the shell has been removed.

[0024] The components are as follows: 1. Shell; 2. Bottom cover; 3. Inner barrel; 4. First chamber; 5. Second chamber; 6. First ash outlet; 7. Top plug; 8. Air inlet; 9. Air outlet; 10. Circular frame; 11. Tubular frame; 12. Mesh body; 13. Flange; 14. Second ash outlet; 15. Main frame tube; 16. Filter element; 17. Extension tube; 18. Cavity; 19. Spring; 20. Tongue; 21. Ash inlet; 22. Handle cavity; 23. Protrusion; 24. Support rib; 25. Baffle; 26. Inclined surface; 27. Acute angle; 28. Dust movement direction. Detailed Implementation

[0025] like Figure 1-9As shown, a dust filtration device for a vacuum cleaner includes a housing 1, a bottom cover 2, an inner tub 3, and a HEPA filter. The housing 1 has openings at both its top and bottom. A preliminary filtration structure divides the housing 1 into a first chamber 4 and a second chamber 5. The inner tub 3 is located within the second chamber 5 of the housing 1. A first dust outlet 6 is provided at the lower end of the inner tub 3. The preliminary filtration structure has an opening that mates with the first dust outlet 6. The bottom cover 2 is sealed at the lower end of the housing 1. A top plug 7 mates with the first dust outlet 6 on the bottom cover 2. A dust inlet 21 is provided and connected to the first chamber 4. An air inlet 8 is provided on the upper part of the side wall of the inner barrel 3, which connects to the interior of the inner barrel 3. An air outlet 9 is provided at the top of the inner barrel 3. The HEPA filter is provided on the top of the housing 1. The air inlet end of the HEPA filter extends downward from the top of the inner barrel 3 into the top of the inner barrel 3. The lower end of the air inlet end of the HEPA filter is lower than the air inlet 8. The axis of the air inlet 8 is perpendicular to the central axis of the inner barrel 3 and at a predetermined distance. The air outlet end of the HEPA filter is located outside the housing 1.

[0026] In this embodiment, during operation, the dust inlet 21 connects to the dust outlet of the vacuum cleaner and then enters the first chamber 4. After being filtered by the preliminary filtration structure, larger dust particles remain in the first chamber 4, while smaller particles enter the second chamber 5 and enter the inner barrel 3 through the air inlet 8 on the side wall of the inner barrel 3. Because "the lower end of the air inlet of the HEPA filter is lower than the air inlet 8, and the axis of the air inlet 8 is perpendicular to the central axis of the inner barrel 3 and at a predetermined distance", the dust will rotate inside the inner barrel 3. Since the vacuum cleaner's exhaust fan is located at the top of the vacuum cleaner's handle, and the air inlet of the vacuum cleaner's exhaust fan is connected to the air outlet of the HEPA filter, the air outlet of the inner barrel 3 in this application is located at the top of the inner barrel 3. This allows larger particles inside the inner barrel 3 to fall to the bottom of the inner barrel 3, while very fine dust leaves the inner barrel 3 from the air outlet 8 at the top of the inner barrel 3 and enters the HEPA filter, where it is filtered. Throughout the process, the first chamber 4 and the second chamber 5 are not arranged in parallel, resulting in a compact and lightweight structure. Furthermore, the inner tub 3 and the HEPA filter are detachable from the housing 1, making cleaning them easier. The top plug 7 prevents the lower end of the inner tub 3 from communicating with the interior of the first chamber 4, thus preventing dust that has not been filtered by the preliminary filtration structure from entering the inner tub 3.

[0027] As a preferred embodiment, the preliminary filtration structure includes a circular frame 10, a tubular frame 11, and a mesh body 12. The circular frame 10 is coaxially disposed within the housing 1. The upper end of the tubular frame 11 is coaxially and fixedly connected to the lower end face of the circular frame 10. The circular frame 10 is coaxially provided with a circular through hole that mates with the tubular frame 11. The circular through hole is connected to the outer circumferential wall of the tubular frame 11. The mesh body 12 is disposed on the portion of the circular frame 10 outside the circular through hole. The mesh body 12 is also disposed on the circumferential surface of the tubular frame 11. The inner diameter of the tubular frame 11 is larger than the outer diameter of the lower end of the inner barrel 3. The lower part of the inner barrel 3 extends coaxially into the lower end of the tubular frame 11. The inner circumferential wall of the lower end of the tubular frame 11 is provided with a flange 13 that is sealed and connected to the outer circumferential wall of the lower end of the inner barrel 3. With this configuration, since both the circular frame 10 and the tubular frame 11 have mesh bodies 12, the amount of dust filtered per unit area on the entire mesh body 12 is relatively small, resulting in a longer service life for the mesh body 12. Simultaneously, the filtration speed and effect are better, and clogging is less likely. The arrangement of "the inner diameter of the tubular frame 11 being larger than the outer diameter of the lower end of the inner barrel 3" prevents the tubular frame 11 from sticking to the lower end of the inner barrel and affecting dust filtration. The flange 13 is provided to prevent the first chamber 4 and the second chamber 5 from connecting at the lower end of the inner barrel 3. Both the circular frame 10 and the tubular frame 11 are designed as frames to adequately support the mesh body 12 while avoiding interference with its filtration function. The circular frame 10 has supporting ribs 24, creating a gap between the inner barrel 3 and the circular frame 10 to prevent the inner barrel 3 from tightly adhering to the mesh body 12.

[0028] As a preferred embodiment, the upper part of the inner bucket 3 is located above the circular frame 10, and the inner diameter of the upper part of the inner bucket 3 is larger than the inner diameter of the circular through hole. This is to ensure that the inner bucket 3 has sufficient length to store the dust that falls off after the airflow inside the inner bucket 3. The setting that "the inner diameter of the upper part of the inner bucket 3 is larger than the inner diameter of the circular through hole" is to ensure that there is sufficient airflow time inside the inner bucket 3, which facilitates the falling of larger dust particles to the bottom of the inner bucket 3.

[0029] As a preferred embodiment, the top plug 7 is hollow with its opening facing downwards. The side wall of the top plug 7 has a second ash outlet 14 connecting to the first chamber 4. The ash inlet 21 is the opening of the top plug 7, and the top of the top plug 7 mates with the first ash outlet 6. With this configuration, dust enters the top plug 7 through the ash inlet 21 and then enters the first chamber 4 through the first ash outlet 6. The top plug 7 on the bottom cover 2 serves two purposes: isolating the inner drum 3 from the first chamber 4, allowing the inner drum 3 to store smaller amounts of dust, and sealing the first chamber 4 to allow it to store initial dust. In other words, the bottom cover 2 performs three functions: ash inlet, sealing the inner drum 3, and sealing the first chamber 4.

[0030] As a preferred embodiment, the axis of the second ash outlet 14 is perpendicular to the axis of the top plug 7, and there is a predetermined distance between the axis of the second ash outlet 14 and the axis of the top plug 7. The purpose of this arrangement is to ensure that the dust entering the first chamber 4 also rotates within the first chamber 4, thereby allowing coarse dust particles to settle on the bottom cover 2.

[0031] As a preferred embodiment, one end of the bottom cover 2 is rotatably connected to the housing 1 via a torsion spring, and the other end of the bottom cover 2 is locked to the housing 1 via a snap fastener. This arrangement facilitates opening and closing the bottom cover 2. In use, the snap fastener is released, and the bottom cover 2 automatically springs open under the action of the torsion spring.

[0032] In a preferred embodiment, the HEPA filter includes a main frame tube 15, a filter element 16, and an extension tube 17. The extension tube 17 is coaxially mounted at the lower end of the main frame tube 15. The outer diameter of the extension tube 17 is smaller than the inner diameter of the upper part of the inner barrel 3. The extension tube 17 extends into the inner barrel 3, and its lower end is below the air inlet of the inner barrel 3. The inner diameter of the main frame tube 15 is larger than the outer diameter of the extension tube 17. The lower end of the main frame tube 15 is sealed to the outer circumferential surface of the upper end of the extension tube 17 via a connecting plate. The filter element 16 is located on the upper part of the main frame tube 15, and there is a predetermined distance between the lower end of the filter element 16 and the lower end of the main frame tube 15. With this configuration, the filter element 16 of the HEPA filter performs a final filtration of the dust sucked into the vacuum cleaner, resulting in less dust in the airflow exiting the vacuum cleaner. The preset distance between the lower end of the filter element 16 and the lower end of the main frame tube 15 ensures that there is enough space on the main frame tube 15 to store the fine dust filtered by the filter element 16.

[0033] In a preferred embodiment, the lower part of the main frame tube 15 extends into the housing 1 and is sealed to the inner circumferential surface of the housing 1. A recess 18 is provided at the upper end of the side wall of the main frame tube 15, and a tongue 20 is located within the recess 18. The lower end of the tongue 20 is fixedly connected to the bottom of the recess 18 via a spring 19. When the spring 19 is in its normal state, the upper end of the tongue 20 is higher than the upper end of the main frame tube 15. This arrangement of the tongue 20 facilitates the installation of the entire dust filter device of this application onto the vacuum cleaner. The recess 18 facilitates the installation of the tongue 20 on the main frame tube 15. A handle cavity 22 is also provided on the tongue 20, primarily to allow the user to insert their fingers into the handle cavity 22 to press the tongue 20 into the recess 18.

[0034] As a preferred embodiment, a plurality of baffles 15 are spirally arranged from bottom to top on the outer side wall of the top plug 7. The angle between the upper surface of each baffle 25 and the upper surface of the bottom cover is 20°. The plane containing this angle is tangent to the location where the baffle 15 is located on the outer side wall of the top plug 7. The direction of the second ash outlet 14 is towards the spiral upward direction of the baffles 25. With this arrangement, due to the spiral arrangement of the baffles 25, when dust enters from the ash inlet 21 and then enters the first chamber from the second ash outlet 14, the direction of the dust is perpendicular to the axis of the top plug 7 and tangent to the outer circumferential wall of the top plug 7. The dust then moves towards the baffles 25, and under the guidance of all the baffles 25, the dust moves to the preliminary filtration structure for filtration; that is, along... Figure 9 The dust moves in the direction 28. The function of the baffle 25 is to block large dust particles, such as hair, etc. (Of course, the illustration doesn't show many baffles 25, but the more the better; generally, 1.5 spiral turns or two turns are best. At the same time, the spiral causes large particles moving in the direction of the vacuum cleaner's fan to undergo some centrifugal force and fall off). Figure 3 As shown, the 20° angle at the end face of baffle 25 is designed to prevent large dust particles from rising and contacting the preliminary filtration structure. Furthermore, the height of the spiral-upward end of baffle 25 facing away from the baffle is greater than the height of the spiral-upward end facing away from the baffle. This facilitates the falling of large dust particles from baffle 15, thus minimizing dust accumulation on baffle 15.

[0035] As a preferred embodiment, the end face of the baffle 25 facing away from the direction of dust movement from the second ash outlet 14 is an inclined surface 26, and the angle between the inclined surface 25 and the upper surface of the baffle 25 is an acute angle 27. The inclined surface 26 is designed to prevent large particles of impurities or dust from contacting the preliminary filtration structure, and the acute angle 27 can trap fibrous impurities such as hair. Simultaneously, this inclination ensures that when dust from the upper baffle 15 falls onto the lower baffle 15, it will not come into contact with the inclined surface 26.

Claims

1. A dust filtering device for a vacuum cleaner, characterized in that, The device includes a housing (1), a bottom cover (2), an inner tub (3), and a HEPA filter. The housing (1) has openings at both the top and bottom. A preliminary filtration structure divides the housing (1) into a first chamber (4) and a second chamber (5). The inner tub (3) is located within the second chamber (5) of the housing (1). A first ash outlet (6) is located at the lower end of the inner tub (3). The preliminary filtration structure has an opening that mates with the first ash outlet (6). The bottom cover (2) is sealed at the lower end of the housing (1). A top plug (7) mates with the first ash outlet (6) on the bottom cover (2). An inlet / outlet is located on the bottom cover (2). The ash inlet (21) is connected to the first chamber (4) through the ash inlet (21). The upper part of the side wall of the inner barrel (3) is provided with an air inlet (8) that connects to the interior of the inner barrel (3). The top of the inner barrel (3) is provided with an air outlet (9). The top of the housing (1) is provided with the HEPA filter. The air inlet end of the HEPA filter extends downward from the top of the inner barrel (3) into the top of the inner barrel (3). The lower end of the air inlet end of the HEPA filter is lower than the air inlet (8). The axis of the air inlet (8) is perpendicular to the central axis of the inner barrel (3) and at a predetermined distance. The air outlet end of the HEPA filter is located outside the housing (1).

2. The dust filtering device for a vacuum cleaner according to claim 1, characterized in that, The preliminary filter structure includes a circular frame (10), a tubular frame (11), and a mesh body (12). The circular frame (10) is coaxially disposed inside the housing (1). The upper end of the tubular frame (11) is coaxially fixedly connected to the lower end face of the circular frame (10). The circular frame (10) is coaxially provided with a circular through hole that mates with the tubular frame (11). The circular through hole is connected to the outer circumferential wall of the tubular frame (11). The upper part of the circular frame (10) is... The mesh body (12) is provided on the part outside the circular through hole, and the mesh body (12) is also provided on the circumferential surface of the tubular frame (11). The inner diameter of the tubular frame (11) is larger than the outer diameter of the lower end of the inner barrel (3). The lower part of the inner barrel (3) extends coaxially into the lower end of the tubular frame (11). The inner circumferential wall of the lower end of the tubular frame (11) is provided with a flange (13) that is sealed and connected to the outer circumferential wall of the lower end of the inner barrel (3).

3. A dust filtering device for a vacuum cleaner according to claim 2, characterized in that, The upper part of the inner barrel (3) is located above the circular frame (10), and the inner diameter of the upper part of the inner barrel (3) is larger than the inner diameter of the circular through hole.

4. A dust filtering device for a vacuum cleaner according to claim 3, characterized in that, The top plug (7) is hollow with its opening facing downwards. The side wall of the top plug (7) is provided with a second ash outlet (14) that connects to the first cavity (4). The ash inlet (21) is the opening of the top plug (7). The top of the top plug (7) is engaged with the first ash outlet (6).

5. A dust filtering device for a vacuum cleaner according to claim 4, characterized in that, The axis of the second ash outlet (14) is perpendicular to the axis of the top plug (7), and there is a preset distance between the axis of the second ash outlet (14) and the axis of the top plug (7).

6. A dust filtering device for a vacuum cleaner according to claim 4, characterized in that, One end of the bottom cover (2) is rotatably connected to the housing (1) via a torsion spring, and the other end of the bottom cover (2) is locked to the housing (1) via a buckle.

7. A dust filtering device for a vacuum cleaner according to claim 4, characterized in that, The HEPA filter includes a main frame tube (15), a filter element (16), and an extension tube (17). The extension tube (17) is coaxially arranged at the lower end of the main frame tube (15). The outer diameter of the extension tube (17) is smaller than the inner diameter of the upper part of the inner barrel (3). The extension tube (17) extends into the inner barrel (3). The lower end of the extension tube (17) is lower than the air inlet of the inner barrel (3). The inner diameter of the main frame tube (15) is larger than the outer diameter of the extension tube (17). The lower end of the main frame tube (15) is sealed to the outer circumferential surface of the upper end of the extension tube (17) through a connecting plate. The filter element (16) is located on the upper part of the main frame tube (15). There is a preset distance between the lower end of the filter element (16) and the lower end of the main frame tube (15).

8. A dust filtering device for a vacuum cleaner according to claim 7, characterized in that, The lower part of the main frame tube (15) extends into the housing (1) and is sealed to the inner circumferential surface of the housing (1). The upper end of the side wall of the main frame tube (15) is provided with a cavity (18), and the tongue (20) is located in the cavity (18). The lower end of the tongue (20) is fixedly connected to the bottom of the cavity (18) by a spring (19). When the spring (19) is in the normal state, the upper end of the tongue (20) is higher than the upper end of the main frame tube (15).

9. A dust filtering device for a vacuum cleaner according to claim 4, characterized in that, The outer side wall of the top plug (7) is provided with a plurality of baffles (15) arranged spirally from bottom to top. The angle between the upper surface of each baffle (25) and the upper surface of the bottom cover is 20°. The plane of the angle is tangent to the location where the baffle (15) is set on the outer side wall of the top plug (7). The direction of the second ash outlet (14) is toward the spiral upward direction of the baffle (25).

10. A dust filtering device for a vacuum cleaner according to claim 9, characterized in that, The end face of the baffle (25) facing away from the direction of movement of the dust flowing out from the second dust outlet (14) is an inclined surface (26), and the angle between the inclined surface (25) and the upper surface of the baffle (25) is an acute angle (27).

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