Handheld vacuum cleaner

Abstract

A handheld vacuum cleaner comprises a housing and a motor disposed within the housing. The housing has a handle for handholding on the outside and an air duct within the housing. The front end of the duct forms a lateral air inlet, and the rear end forms an exhaust port. The motor accelerates the air within the duct. The duct is characterized in that it sequentially comprises a primary centrifugal zone, a secondary filter, a third acceleration centrifugal zone, and a fourth-stage HEPA filter. The motor is disposed at the outlet end of the fourth-stage HEPA filter and near the exhaust port of the duct. The graded filtration arrangement reduces the risk of clogging the second-stage filter, and simultaneously reduces the total cross-sectional area of the duct, increasing wind speed several times. The combination of rotary centrifugal and parabolic principles allows for the separation of even smaller dust particles.

Description

Technical Field

[0001] The present invention relates to a dust collecting device, in particular to a dust collector. Background Art

[0002] Currently, most vacuum cleaners fall into two categories. One type is the older style with a power cord. This type offers advantages such as high power, strong suction, and unlimited battery life. However, this also has its drawbacks. Because of the power cord, it can be inconvenient to use, limited by its length and flexibility. The other type, which has become popular in recent years, is the handheld battery-powered vacuum cleaner. These are compact and feature a built-in battery, eliminating the need for a power cord, making them particularly convenient and flexible. However, their drawbacks include limited battery life due to the overall weight (which can affect user experience) and the limited number of batteries. Furthermore, achieving optimal suction requires increasing the power of the internal motor, which in turn shortens battery life.

[0003] In summary, in order to achieve better dust collection and battery life, the design requirements for handheld vacuum cleaners are higher, especially the air duct design and dust separation structure of the vacuum cleaner, which need to achieve better dust collection effect under the same or lower motor power.

[0004] At present, when the first-stage filter of a handheld vacuum cleaner is filtering, due to the air duct and structural reasons, there is no separate space to store dust. The wind mixed with dust and foreign matter directly hits the surface of the filter. As the dust accumulates, the surface of the filter will be blocked. After being blocked, the machine can hardly be used normally, the suction force decreases linearly, and the noise increases. This kind of dust suction capacity is limited. The dust separation effect is not enough, resulting in a lot of dust accumulation on the surface of the rear filter HEPA, causing the HEPA to be blocked. This leads to the need to frequently clean the machine and replace the HEPA. It can be seen that the existing handheld vacuum cleaners only have a simple first-stage separation to separate the dust passing through the filter, and the effect is poor, resulting in the rear HEPA (filter element) often being easily blocked, requiring cleaning and easily damaged. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a handheld vacuum cleaner with graded filtration to ensure that the air duct will not be blocked for a long time in response to the above technical status quo.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a handheld vacuum cleaner, comprising a shell and a motor arranged in the shell, the outer side of the shell having a handle for handholding, and the interior having an air duct, the front end of the air duct forming a lateral air inlet, and the rear end forming an exhaust port, the motor accelerating the air in the air duct, and characterized in that the air duct comprises a first-stage centrifugal zone, a second-stage filter, a third-stage acceleration centrifugal zone and a fourth-stage HEPA in sequence, and the motor is arranged at the air outlet end of the fourth-stage HEPA and close to the exhaust port of the air duct.

[0007] The shell is provided with a longitudinally arranged filter cartridge, the side wall of which is provided with a high tangential air inlet and a low-level dust collection port, the tangential air inlet is connected to the lateral air inlet of the aforementioned air duct, and the aforementioned first-level dust collection port is connected to the first-level dust cup; a separator is axially arranged in the middle of the filter cartridge, and at least one tangential air inlet with a gradually decreasing diameter is provided in the middle of the side wall of the separator, a hollow air cylinder is formed in the axial middle of the upper end, and a three-stage dust collection chamber is formed at the bottom. The top of the three-stage dust collection chamber is provided with a baffle, and a vent for entering the air cylinder is formed between the baffle and the lower end of the air cylinder, an air inlet channel is formed between the dust inlet of the three-stage dust collection chamber and the air outlet end of the three-stage acceleration centrifugal zone, and the air inlet end of the inlet channel is expanded; a secondary filter screen is sleeved on the outer periphery of the aforementioned tangential air inlet; the annular cavity between the inner wall of the filter cartridge and the filter screen forms a first-level centrifugal zone, and a three-stage acceleration centrifugal zone is formed between the inner wall of the separator and the outer wall of the air cylinder.

[0008] The housing is provided with a collection cover that can be opened and closed. The collection cover includes a first receiving portion, a second receiving portion, and a third receiving portion. The first receiving portion is located on one side of the second receiving portion, the second receiving portion is annular, and the third receiving portion is located at the center of the second receiving portion. When the collection cover is closed, the first receiving portion forms the bottom of the first-stage dust cup, the second receiving portion forms the bottom of the first-stage centrifugal zone, and the third receiving portion forms the bottom of the third-stage dust collection chamber. When the collection cover is opened, dust particles in the first-stage dust cup, the second-stage filter, and the third-stage dust collection chamber are collected at once, facilitating cleaning operations.

[0009] To facilitate setup and installation, the housing has an inner cavity, within which a liner is located. The filter cartridge is molded onto the liner, and the primary dust cup is formed on the liner and located on one side of the filter cartridge. The rear end of the liner has a sleeve portion for mounting the fourth-stage HEPA filter. The collection cover is openably and closably located at the bottom of the liner. The liner, separator, collection cover, secondary filter, and fourth-stage HEPA filter form an assembled module, facilitating assembly, maintenance, and cleaning.

[0010] Preferably, the middle protrusion of the baffle is spherical, which is conducive to the collection of dust particles in the three-stage dust collection chamber.

[0011] Furthermore, there are at least two tangential air inlets arranged around the circumference of the separator.

[0012] Compared with the prior art, the advantages of the present invention are: the first stage dust separation is centrifugal separation, the second stage dust separation is screen filtration separation, the third stage dust separation is acceleration centrifugal separation, and the fourth stage is HEPA filtration separation. The air duct design allows the dust-laden wind to be ejected in the direction of the involute by inertia through the shape of the air duct and the centrifugal principle, achieving the first stage dust separation effect. Since the first stage dust separation removes the large dust, the risk of clogging the second stage filter is reduced, and there is no suction attenuation. In the third stage filtration, since the large and heavy particles have been filtered out by the first and second stages, the wind speed and centrifugal force must be increased to separate the smaller dust. Furthermore, the total cross-sectional area of the air duct is reduced. Under the same wind conditions, the wind speed can be increased several times. By combining the rotation centrifugal and parabolic principles, the smaller dust is separated effectively. After the fourth stage HEPA filtration, the clean air is finally discharged through the exhaust port. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0014] Figure 2 This is an exploded view of the embodiment.

[0015] Figure 3 A cross-sectional view of an embodiment.

[0016] Figure 4 This is an exploded and enlarged view of the separator and secondary filter.

[0017] Figure 5 This is a partially enlarged three-dimensional cross-sectional view of the separator.

[0018] Figure 6 This is a diagram of the state after the collecting cover of the embodiment is opened. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the handheld vacuum cleaner in this embodiment includes a shell 1 and a motor 7, a lining shell 2 and a collecting cover 5 arranged in the shell 1. The outer side of the shell 1 has a handle 13 for handholding, and the inside has an air duct. The front end of the air duct forms a lateral air inlet 11, and the rear end forms an exhaust port 12. A dust collector head (not shown in the figure) can be set on the lateral air inlet 11. The motor 7 accelerates the air in the air duct. The air duct includes a first-stage centrifugal zone 26, a second-stage filter 4, a third-stage acceleration centrifugal zone 38 and a fourth-stage HEPA 6 in sequence. The motor 7 is arranged at the air outlet end of the fourth-stage HEPA 6 and is close to the exhaust port 12 of the air duct.

[0021] The housing 1 has an inner cavity 15, within which a liner 2 is disposed. The liner 2 is formed with a longitudinally arranged filter cartridge 22, a primary dust cup 21, and a sleeve portion 23. The primary dust cup 21 is located on one side of the filter cartridge 22. The sleeve portion 23 is formed at the rear end of the liner 2 for mounting the fourth-stage HEPA 6. A collection cover 5 is openably and closably disposed at the bottom of the liner 2. The sidewall of the filter cartridge 22 is provided with a high-positioned tangential air inlet 24 and a low-positioned primary dust collection port 25. The tangential air inlet 24 communicates with the lateral air inlet 11 of the air duct, and the primary dust collection port 25 feeds into the primary dust cup 21.

[0022] Combine Figure 4 and Figure 5 As shown, a separator 3 is axially disposed in the middle of the filter cartridge 22. Multiple tangential air inlets 31 of gradually decreasing diameter are formed in the middle of the sidewall of the separator 3. These inlets 31 are arranged circumferentially around the separator 3. A hollow vent 32 is formed in the axial middle of the upper end of the filter cartridge 22, and a three-stage dust collection chamber 37 is formed at the bottom. A baffle 34 is provided at the top of the three-stage dust collection chamber 37. A vent 35 for entering the vent 32 is formed between the baffle 34 and the lower end of the vent 32. The baffle 34 has a spherical protrusion in the middle. An air inlet channel 33 is formed between the dust inlet of the tertiary dust collection chamber 37 and the air outlet of the tertiary acceleration centrifugal zone 38. The air inlet end of this air inlet channel 33 is flared. A secondary filter screen 4 is sheathed around the tangential air inlet 31. The annular cavity between the inner wall of the filter cartridge 22 and the secondary filter screen 4 forms the primary centrifugal zone 26. The tertiary acceleration centrifugal zone 38 is formed between the inner wall of the separator 3 and the outer wall of the vent cartridge 32. In this embodiment, the separator 3 is sheathed with a sealing ring 3b and a sealing ring 3a at both its upper and lower ends.

[0023] Combine Figure 3 As shown, the collecting cover 5 includes a first receiving portion 51, a second receiving portion 52 and a third receiving portion 53. The first receiving portion 51 is located on one side of the second receiving portion 52, the second receiving portion 52 is annular, and the third receiving portion 53 is located at the center of the second receiving portion 52. When the collecting cover 5 is in the closed state, the first receiving portion 51 forms the bottom of the first-level dust cup 21, the second receiving portion 52 forms the bottom of the first-level centrifugal zone 26, and the third receiving portion 53 forms the bottom of the third-level dust collection chamber 37.

[0024] Working principle: The mixed air mixed with dust enters the air duct of the machine through the side air inlet 11 under the action of the negative pressure suction of the motor. In the first-stage centrifugal zone 26, the dust density is greater than that of the air. Therefore, the heavier dust rotates along the outer wall of the filter cylinder 22 under the action of inertia and centrifugal force, passes through the first-stage dust collection port 25, is thrown out of the first-stage centrifugal zone 26, and enters the first-stage dust cup 21; the mixed air passing through the first-stage centrifugal zone 26 continues to pass through the second-stage filter 4 and enters the interior of the second-stage filter 4. Some dust that cannot pass through the second-stage filter 4 will continue to rotate and be centrifugally separated again after rotation until it is thrown out of the first-stage centrifugal zone 26. The mixed air entering the interior of the second-stage filter 4 is affected by the rotation inertia of the first-stage centrifugal zone 26 and continues to rotate and gather towards the center. It is further guided by the tangential air inlet 31 of the separator and the third-stage acceleration centrifugal zone 38, and the mixed air continues to rotate. When the mixed air enters the third-stage accelerated centrifugal zone 38, the total cross-sectional area of the air duct is reduced. Under the condition of the same air volume, the rotational wind speed will be increased several times, thereby generating a stronger centrifugal force (if the wind speed does not increase, the centrifugal force cannot be increased, and the dust separation effect cannot be achieved again). The accelerated rotating mixed air, under the action of suction, enters the air inlet channel 33. The air inlet end of the air inlet channel 33 is flared, and the cross-sectional area increases rapidly. Under the action of centrifugal force, the dust is thrown into the third-stage dust collection chamber 37. The rest of the air continues to pass through the ventilator 32 and enters the fourth-stage HEPA 6. After the gas is filtered by the high-density HEPA, the clean air continues to be sucked into the motor and finally discharged from the exhaust port 12.

[0025] like Figure 6 As shown, after the collecting cover 5 is opened, the dust separated in the three compartments can be poured out together, which is more convenient.

Claims

1. A handheld vacuum cleaner comprising a housing (1) and a motor (7) disposed within the housing (1), wherein the housing (1) has a handle (13) for hand-holding on the outside and an air duct inside, wherein the front end of the air duct forms a lateral air inlet (11) and the rear end forms an exhaust port (12), and the motor (7) accelerates the air in the air duct, characterized in that The air duct comprises a first-stage centrifugal zone (26), a second-stage filter (4), a third-stage acceleration centrifugal zone (38) and a fourth-stage HEPA (6) in sequence, and the aforementioned motor (7) is arranged at the air outlet end of the fourth-stage HEPA (6) and close to the air outlet (12) of the air duct; The housing (1) has a filter cartridge (22) arranged longitudinally therein, and a high-positioned tangential air inlet (24) and a low-positioned first-level dust collecting port (25) are provided on the side wall of the filter cartridge (22), and the tangential air inlet (24) is communicated with the lateral air inlet (11) of the aforementioned air duct; the aforementioned first-level dust collecting port (25) is led into the first-level dust cup (21); a separator (3) is axially arranged in the middle of the filter cartridge (22), and at least one tangential air inlet (31) with a gradually decreasing diameter is provided in the middle of the side wall of the separator (3), a hollow vent cylinder (32) is formed in the axial middle of the upper end, and a three-level dust collecting chamber (37) is formed at the bottom. The top of the chamber (37) is provided with a baffle (34), and a vent hole (35) for entering the vent cylinder (32) is formed between the baffle (34) and the lower end of the vent cylinder (32). The annular cavity between the inner wall of the filter cylinder (22) and the secondary filter screen (4) forms a primary centrifugal zone (26), and a tertiary acceleration centrifugal zone (38) is formed between the inner wall of the separator (3) and the outer wall of the vent cylinder (32); an air inlet channel (33) is formed between the dust inlet of the tertiary dust collection chamber (37) and the air outlet end of the tertiary acceleration centrifugal zone (38), the air inlet end of the air inlet channel (33) is in an expanded shape, and a secondary filter screen (4) is sleeved on the outer periphery of the tangential air inlet (31).

2. The handheld vacuum cleaner according to claim 1, characterized in that The middle of the baffle (34) is convex and spherical.

3. The handheld vacuum cleaner according to claim 1, characterized in that There are at least two tangential air inlets (31) arranged around the circumference of the separator (3).

4. The handheld vacuum cleaner according to claim 1, characterized in that The shell (1) is provided with a collecting cover (5) which can be opened and closed. The collecting cover (5) comprises a first receiving portion (51), a second receiving portion (52) and a third receiving portion (53). The first receiving portion (51) is located on one side of the second receiving portion (52), the second receiving portion (52) is annular, and the third receiving portion (53) is located at the center of the second receiving portion (52). When the collecting cover (5) is in a closed state, the first receiving portion (51) forms the bottom of the first-stage dust cup (21), the second receiving portion (52) forms the bottom of the first-stage centrifugal zone (26), and the third receiving portion (53) forms the bottom of the third-stage dust collection chamber (37).

5. The handheld vacuum cleaner according to claim 4, characterized in that The shell (1) has an inner cavity (15), a liner shell (2) is provided in the inner cavity (15), the filter cartridge (22) is formed on the liner shell (2), the first-stage dust cup (21) is formed on the liner shell (2) and is located on one side of the filter cartridge (22), the tail end of the liner shell (2) has a sleeve portion (23) for the fourth-stage HEPA (6) to be provided, and the collection cover (5) is provided at the bottom of the liner shell (2) in an openable and closable manner.

Images