Handheld dust collector with self-cleaning function

Abstract

The utility model discloses a handheld dust collector with a self-cleaning function, which belongs to the technical field of electric cleaning equipment and comprises a host, a dust cup and a filter module, the host comprises a casing and an airflow generating module, a dirt inlet channel is arranged on the dust cup, and the airflow generating module works to form working airflow. The handheld dust collector has a self-cleaning mode, the dirt inlet channel is closed in the self-cleaning mode, a self-cleaning air duct located on the downstream of the filtering module and the upstream of the airflow generation module is arranged in the flowing direction of working airflow, and the self-cleaning air duct is intermittently opened in the self-cleaning mode. Air in the dust cup is extracted by the airflow generating module in a self-cleaning mode to be in a negative pressure state, at least part of air flowing in from the opened self-cleaning air channel flows into the dust cup through the filtering module to form self-cleaning airflow, and the flow direction of the self-cleaning airflow is opposite to that of the working airflow. The self-cleaning of the filter module is realized by utilizing a back flushing mode, and only a self-cleaning air duct needs to be added on an original structure.

Description

Technical Field

[0001] This utility model relates to the field of electric cleaning equipment technology, and in particular to a handheld vacuum cleaner with self-cleaning function. Background Technology

[0002] With the development of technology and the improvement of living standards, various electrical appliances have entered people's lives and production, bringing great convenience. Vacuum cleaners, as a common electrical appliance, are mainly used to collect dust, debris, and other dirt. Existing handheld vacuum cleaners generally include a main unit and a dust cup. The main unit is equipped with an airflow generating module consisting of a motor and an impeller. The dust cup is equipped with a filter module for separating dirt and airflow. When the airflow generating module is working, it draws air into the dust cup, creating negative pressure inside the dust cup. External air flows into the dust cup under the action of air pressure difference, forming a working airflow. Dirt follows the working airflow into the dust cup. The filter module separates the dirt from the working airflow. The separated working airflow is discharged after flowing through the main unit.

[0003] The dirt sucked into the dust cup typically includes fine particles such as dust. During filtration, these fine particles easily adhere to the filter module and gradually accumulate. The increasing accumulation of these particles reduces the filter module's filtration capacity, weakening the airflow and consequently reducing the vacuum cleaner's suction power, thus negatively impacting the user experience. Traditional handheld vacuum cleaners lack a self-cleaning mechanism for the filter module. Users typically remove the filter module and tap it to dislodge the fine particles, but this method can easily damage the filter module due to excessive force. Therefore, some handheld vacuum cleaners incorporate a dust-removing unit that impacts the filter module to dislodge the fine particles. However, this method requires a separate dust-removing motor, impact components, and transmission structure, making the vacuum cleaner's internal structure more complex and reducing overall cost. Utility Model Content

[0004] To address the shortcomings and deficiencies of the existing technology, this utility model provides a handheld vacuum cleaner with a self-cleaning function. It utilizes a back-blowing method to achieve self-cleaning of the filter module. Only a self-cleaning air duct needs to be added to the original structure, which can reasonably control the cost of the whole machine without increasing the structural complexity of the vacuum cleaner.

[0005] To achieve the above technical objectives, the present invention provides a handheld vacuum cleaner with a self-cleaning function, comprising:

[0006] The main unit includes a housing and an airflow generating module located inside the housing;

[0007] The dust cup is detachably attached to the front of the main unit and has a dirt inlet channel.

[0008] A detachable filter module that can be installed inside the dust cup;

[0009] The airflow generating module generates working airflow that flows from the inlet channel into the dust cup and then flows through the filter module to the airflow generating module.

[0010] The handheld vacuum cleaner has a self-cleaning mode;

[0011] The waste inlet channel is closed in self-cleaning mode;

[0012] A self-cleaning air duct is provided in the direction of the working airflow, located downstream of the filter module and upstream of the airflow generation module. The self-cleaning air duct is intermittently opened in the self-cleaning mode.

[0013] In self-cleaning mode, the air inside the dust cup is drawn into a negative pressure state by the airflow generation module. At least part of the air flowing in from the open self-cleaning air duct passes through the filter module and flows into the dust cup to form a self-cleaning airflow. The direction of the self-cleaning airflow is opposite to the direction of the working airflow.

[0014] Preferably, the inner cavity of the dust cup is divided into a dirt-collecting cavity and a clean-filtering cavity by a filter module. The air inlet of the self-cleaning air duct can be closed by a block, and the air outlet of the self-cleaning air duct is connected to the clean-filtering cavity. At least part of the air flowing in from the self-cleaning air duct passes through the clean-filtering cavity and flows to the dirt-collecting cavity.

[0015] Preferably, the front end of the airflow generating module is provided with an air intake, and the front end of the main unit is provided with a vent for connecting the filter chamber and the air intake. The self-cleaning air duct includes a first air duct section and a second air duct section that are connected to each other. The first air duct section extends from the air inlet to the second air duct section. The second air duct section is located outside the vent and is separated from the vent. The rear end of the second air duct section is closed and the front end is open towards the filter chamber.

[0016] Preferably, the outer periphery of the vent has a convex ring extending forward around the vent, and the second air duct portion of the self-cleaning air duct is located outside the convex ring, and the second air duct portion of the self-cleaning air duct is separated from the vent by the convex ring; and / or, the outer periphery of the second air duct portion is provided with a mating sealing ring, which can abut against the rear end of the filter module to keep the second air duct portion and the filter cavity in a circumferentially sealed communication.

[0017] Preferably, the vent is provided with a grille and a filter, the filter being disposed on the grille and covering the vent; and / or, the vent has a sleeve extending rearward around the vent, the sleeve being fitted around the outer periphery of the airflow generating module.

[0018] Preferably, the front end of the main unit is provided with a bracket fixed by the casing, and the ventilation opening and self-cleaning air duct are provided on the bracket; and / or, several self-cleaning air ducts are provided at intervals along the circumference of the main unit.

[0019] Preferably, the block has a main body portion that can close the air inlet end of the self-cleaning air duct from the outside, and the size of the main body portion is larger than the aperture of the air inlet end of the self-cleaning air duct; and / or, the block has a plug head that can be inserted into the air inlet end of the self-cleaning air duct, and the plug head is interference-fitted with the air inlet end of the self-cleaning air duct.

[0020] Preferably, the block is elastic; and / or, the block has a pinchable part on the side facing away from the self-cleaning air duct.

[0021] Preferably, the dust cup includes a cup body and an inlet pipe, with at least a portion of the inlet channel located on the inlet pipe. The cup body has an insertion hole that mates with the inlet pipe, and the rear end of the inlet pipe is detachably inserted into the insertion hole. In self-cleaning mode, the inlet pipe disengages from the insertion hole, and the insertion hole is closed by a plug inserted therein. Alternatively, the dust cup includes a cup body and an inlet pipe, with at least a portion of the inlet channel located on the inlet pipe. In cleaning mode, the inlet pipe is closed by a plug inserted therein.

[0022] Preferably, the front end of the main unit is provided with a lighting component, which is centered with the sewage inlet channel.

[0023] By adopting the above technical solution, this utility model has the following advantages:

[0024] 1. The handheld vacuum cleaner provided by this utility model features a self-cleaning air duct located downstream of the filter module and upstream of the airflow generating module in the direction of the working airflow. When the vacuum cleaner is in self-cleaning mode, the inlet channel is closed, and the airflow generating module draws air from the dust cup, creating a negative pressure inside the dust cup. The self-cleaning air duct is intermittently opened, allowing external air to flow in. When a certain negative pressure is reached inside the dust cup, at least a portion of the air flowing in from the self-cleaning air duct will flow backward through the filter module into the dust cup under the influence of the pressure difference, forming a self-cleaning airflow. The flow direction of the self-cleaning airflow is opposite to that of the working airflow. This self-cleaning airflow cleans the filter module by backflushing it, allowing fine particles adsorbed on the filter module to be blown away, thus achieving the self-cleaning purpose of the filter module. Since the self-cleaning of the filter module is achieved by backflushing, only the self-cleaning air duct needs to be added to the existing structure, allowing for reasonable cost control of the entire machine without increasing the structural complexity of the vacuum cleaner.

[0025] 2. The dust cup's inner cavity is divided into a dirt-collecting chamber and a clean-filtering chamber by the filter module. The air outlet of the self-cleaning duct is connected to the clean-filtering chamber. At least part of the air flowing in from the self-cleaning duct passes through the clean-filtering chamber and flows into the dirt-collecting chamber, causing the self-cleaning airflow to flow in reverse through the filter module. This reverse self-cleaning airflow blows the adsorbed fine particles away from the filter module, and the blown-away fine particles fall into the dirt-collecting chamber. Self-cleaning is achieved through this backflushing. A proper arrangement of the relationship between the self-cleaning duct and the filter module ensures that at least part of the air flowing in from the self-cleaning duct can backflush the filter module.

[0026] 3. The self-cleaning air duct includes a first air duct section and a second air duct section that are interconnected. The first air duct section extends from the air inlet to the second air duct section. The second air duct section is located outside the vent and is separated from the vent. The front end of the second air duct section is open towards the filter cavity. At least part of the air flowing in from the air inlet can flow along the first and second air duct sections to the filter cavity, thereby smoothly forming a self-cleaning airflow flowing in the opposite direction through the filter module. A reasonable design of the self-cleaning air duct structure simplifies the self-cleaning air duct while smoothly forming a self-cleaning airflow through the filter module. The second air duct section is separated from the vent to prevent air flowing in from the self-cleaning air duct from directly flowing through the vent to the air intake of the airflow generating module.

[0027] 4. The convex ring extends forward around the vent, with the vent located on the inner circumference of the convex ring. The second air duct of the self-cleaning air duct is located on the outer circumference of the convex ring. The convex ring separates the vent and the second air duct, preventing the airflow from the self-cleaning air duct from flowing directly through the vent to the air intake and thus preventing the formation of a backflowing self-cleaning airflow.

[0028] A sealing ring is installed around the outer periphery of the second air duct section. The front end of the second air duct section and the rear end of the filter chamber are circumferentially sealed through this sealing ring. This prevents some air flowing into the dust cup from the self-cleaning air duct from escaping through the gap between the second air duct section and the filter chamber, ensuring the strength of the self-cleaning airflow and thus guaranteeing the self-cleaning effect of the filter module. Furthermore, since the vent is located inside the second air duct section and its rear end is closed, a circumferential sealing ring can also be used to connect the vent to the rear end of the filter chamber, further ensuring the strength of the working airflow.

[0029] 5. A grille and filter are installed at the ventilation opening. The filter is placed on the grille and covers the ventilation opening. The filter is used to filter the airflow to the airflow generating module again, so as to prevent small impurities and dust from flowing into the airflow generating module with the airflow. It also prevents foreign objects from being sucked into the main unit if the airflow generating module is accidentally started when the main unit is alone.

[0030] A sleeve extending backward around the vent is fitted around the outer periphery of the airflow generating module. The sleeve and the airflow generating module work together to achieve a circumferential seal between the vent and the air intake, preventing air leakage between the vent and the air intake and ensuring the suction strength of the working airflow.

[0031] 6. The front end of the main unit is fixed with a bracket inside the casing. The ventilation opening and self-cleaning air duct are located on the bracket. The structure of the main unit is reasonably designed to reduce the number of main unit components and reduce the difficulty of forming the self-cleaning air duct.

[0032] Several self-cleaning air ducts can be set at intervals along the circumference of the main unit. This can appropriately increase the air volume flowing into the self-cleaning air duct during self-cleaning, thereby increasing the intensity of the self-cleaning airflow and thus improving the self-cleaning effect of the self-cleaning airflow on the filter module.

[0033] 7. The block can be equipped with a main body. The size of the main body is larger than the diameter of the air inlet of the self-cleaning air duct. The main body can effectively and completely cover the air inlet of the self-cleaning air duct from the outside, so that the block can completely close the air inlet of the self-cleaning air duct.

[0034] The block can be equipped with a plug head, which is interference-fitted with the air inlet of the self-cleaning air duct. The plug head can be inserted into the air inlet of the self-cleaning air duct through the interference fit, so that the block can completely close the air inlet of the self-cleaning air duct.

[0035] 8. The plug is elastic, meaning it can be made of elastic materials such as rubber or silicone. This helps to improve the sealing effect of the plug on the air inlet of the self-cleaning duct, preventing air leakage during normal vacuuming operations and ensuring the suction strength of the working airflow.

[0036] The block has a pinching part on the side facing away from the self-cleaning air duct. When the vacuum cleaner is self-cleaning, the user can easily remove and install the block by pinching the pinching part, which makes it convenient for the user to intermittently open and close the self-cleaning air duct in self-cleaning mode. Attached Figure Description

[0037] Figure 1 This is a complete drawing of the handheld vacuum cleaner in Example 1;

[0038] Figure 2 This is an exploded view of the handheld vacuum cleaner in Example 1;

[0039] Figure 3 This is a partial structural diagram of the host computer in Example 1;

[0040] Figure 4 This is an axial sectional view of a portion of the structure of the handheld vacuum cleaner in Embodiment 1 when the suction tube is inserted into the socket;

[0041] Figure 5This is an axial sectional view of a portion of the structure of the handheld vacuum cleaner in Embodiment 1 when the plug is inserted into the insertion hole;

[0042] Figure 6 This is an axial cross-sectional view of a portion of the structure of the handheld vacuum cleaner in Embodiment 1 along another cross-sectional direction;

[0043] Figure 7 This is an exploded view of the filtering module in Example 1;

[0044] Figure 8 This is an exploded view of the airflow generating module, bracket, filter, and mating sealing ring in Embodiment 1;

[0045] Figure 9 This is a structural diagram of the support structure in Example 1;

[0046] Figure 10 This is an axial sectional view of the bracket in Embodiment 1;

[0047] Figure 11 This is another structural schematic diagram of the block in Example 1;

[0048] Figure 12 This is another structural schematic diagram of the block in Example 1.

[0049] In the picture, 10 is a handheld vacuum cleaner.

[0050] 100-Main unit, 110-House, 111-Handle, 112-Receiver, 113-Air outlet, 120-Airflow generating module, 121-Intake port, 122-Exhaust port, 130-Ventilation vent, 140-Switch, 150-Operating component, 160-Lighting component

[0051] 200-Dust cup, 210-Sludge inlet channel, 220-Cup body, 230-Sludge inlet pipe, 231-Inner hole, 240-Plug-in part, 241-Plug hole, 250-Valve plate, 260-Sludge collection chamber, 270-Plug head.

[0052] 300 - Filter module, 300a - Filter unit, 310 - HEPA filter, 320 - Cover, 330 - Ring cover, 340 - Support frame, 350 - Sealing ring A, 360 - Sealing ring B, 370 - Filter chamber

[0053] 400 - Self-cleaning air duct, 401 - Air inlet, 402 - Air outlet, 410 - First air duct section, 420 - Second air duct section

[0054] 500-battery pack,

[0055] 610-Bracket, 611-Ring, 612-Sleeve, 613-Stepped section, 614-Protrusion, 615-Gutter, 616-Flange, 617-Grid frame, 618-Snap-on, 619-Positioning hole, 620-Sealing ring C, 630-Matching sealing ring, 640-Filter element

[0056] 700 - Block, 710 - Main body, 720 - Positioning post, 730 - Gripping part, 740 - Block head

[0057] WA - Working airflow, CA - Self-cleaning airflow. Detailed Implementation

[0058] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0059] Example 1

[0060] Combination Figures 1 to 10 The handheld vacuum cleaner 10 with self-cleaning function provided in Embodiment 1 of this utility model includes:

[0061] The main unit 100 includes a housing 110 and an airflow generating module 120 disposed within the housing 110;

[0062] A dust cup 200 is detachably attached to the front end of the main unit 100, and the dust cup 200 is provided with a dirt inlet channel 210.

[0063] A detachable filter module 300 is installed inside the dust cup 200;

[0064] The airflow generating module 120 generates a working airflow (WA) that flows from the inlet channel 210 into the dust cup 200 and then flows through the filter module 300 to the airflow generating module 120.

[0065] The handheld vacuum cleaner 10 has a self-cleaning mode;

[0066] Inlet channel 210 is closed in self-cleaning mode;

[0067] A self-cleaning air duct 400 is provided in the flow direction of the working airflow WA, located downstream of the filter module 300 and upstream of the airflow generating module 120. The self-cleaning air duct 400 is intermittently opened in the self-cleaning mode.

[0068] In self-cleaning mode, the air inside the dust cup 200 is drawn into a negative pressure state by the airflow generating module 120. At least part of the air flowing in from the open self-cleaning air duct 400 flows into the dust cup 200 through the filter module 300 to form a self-cleaning airflow (CA). The direction of the self-cleaning airflow CA is opposite to the direction of the working airflow WA.

[0069] When the vacuum cleaner 10 is in self-cleaning mode, the inlet channel 210 is closed, and the airflow generation module 120 draws air from inside the dust cup 200, creating a negative pressure inside the dust cup 200. The self-cleaning air duct 400 is intermittently opened, allowing external air to flow in. When a certain negative pressure is reached inside the dust cup 200, at least a portion of the air flowing in from the self-cleaning air duct 400 will flow in the opposite direction to the dust cup 200 under the influence of the pressure difference, forming a self-cleaning airflow CA. The flow direction of the self-cleaning airflow CA is opposite to that of the working airflow WA. The self-cleaning airflow CA is used to back-blow and clean the filter module 300, allowing fine particles adsorbed on the filter module 300 to be blown away by the back-blowing self-cleaning airflow CA, thus achieving the self-cleaning purpose of the filter module 300. Since the filter module 300 is self-cleaned by using a back-blowing method, only a self-cleaning air duct 400 needs to be added to the original structure, which can reasonably control the cost of the whole machine without increasing the structural difficulty of the vacuum cleaner.

[0070] Combination Figure 2 , Figure 3In this embodiment, the housing 110 can adopt a shell structure that opens from left to right. The airflow generating module 120 can adopt a small fan structure combining a motor and an impeller. The airflow generating module 120 is clamped and fixed inside the housing 110, and its axis is arranged substantially in the front-to-back direction. The front end of the airflow generating module 120 is provided with an air intake 121, and the rear end is provided with an air exhaust 122. At least one side wall of the left and right sides of the housing 110 is provided with an air outlet 113. The airflow flowing through the airflow generating module 120 is finally discharged from the main unit 100 through the air outlet 113. The rear end of the housing 110 forms a handle 111 for gripping, and the user can grip the main unit 100 or the entire machine through the handle 111. The handheld vacuum cleaner 10 of this embodiment is preferably powered by a battery pack 500. A receiving portion 112 is located at the bottom of the handle 111 at the rear end of the housing 110. The receiving portion 112 receives the battery pack 500 installed on the main unit 100, meaning the battery pack 500 is detachably installed on the main unit 100 via the receiving portion 112. The battery pack 500 installed on the main unit 100 can supply power to electrical components such as the airflow generating module 120. To reduce wind noise and prevent foreign objects from entering the main unit 100 through the air outlet 113, a sponge covering the air outlet 113 can be provided on the inner wall of the housing 110. To allow airflow to exit the main unit 100 as quickly as possible through the air outlet 113, multiple air outlets 113 can be provided. As an alternative to this embodiment, the handle 111 can also be formed on the top side of the housing 110, or the handheld vacuum cleaner 10 can also be powered by a power cord with a plug connected to AC mains power.

[0071] Combination Figure 4In this embodiment, the dust cup 200 includes a cup body 220 and an inlet pipe 230. At least a portion of the inlet channel 210 is disposed on the inlet pipe 230. The cup body 220 has an insertion hole 241 that mates with the inlet pipe 230. The rear end of the inlet pipe 230 is detachably inserted into the insertion hole 241. Specifically, the dust cup 200 also includes a connector 240 fixed to the top side of the cup body 220. The insertion hole 241 is disposed on the connector 240. The front end of the insertion hole 241 extends to the front surface of the connector 240, and the rear end of the insertion hole 241 extends to the rear end of the cup body 220. The rear end of the insertion hole 241 can communicate with the rear end of the cup body 220. The inlet channel 210 is formed by the inner hole 231 of the inlet pipe 230 and the insertion hole 241 of the connector 240. The rear end of the socket 241 is provided with a valve plate 250 for opening and closing the dirt inlet channel 210. The valve plate 250 is elastic and one side is hinged to the inner wall of the socket 240. Under normal conditions, the valve plate 250 closes the dirt inlet channel 210. When the vacuum cleaner is vacuuming, the airflow generating module 120 draws air from the inside of the dust cup 200, and the inside of the dust cup 200 is in a negative pressure state. There is an air pressure difference between the inside of the dust cup 200 and the outside air. Under the action of the air pressure difference, the valve plate 250 deflects and opens the dirt inlet channel 210. Under the action of the air pressure difference, the outside air flows into the dust cup 200 through the dirt inlet channel 210 to form a working airflow WA. The dirt from the outside can be sucked into the dust cup 200 along with the working airflow WA. After the vacuum cleaner stops, the airflow generation module 120 stops working, the dust cup 200 returns to an air pressure state that is basically the same as the outside air, the pressure difference effect on the valve plate 250 disappears, and the valve plate 250 returns to the state of closing the dirt inlet channel 210.

[0072] Combination Figure 7In this embodiment, the filter module 300 includes a HEPA filter 310, a cover 320, an annular cover 330, a support frame 340, a sealing ring A350, and a sealing ring B360. The HEPA filter 310 is pleated and forms a hollow cylindrical shape. The cover 320 is fixed to the front end of the HEPA filter 310, and the annular cover 330 is fixed to the rear end of the HEPA filter 310. The HEPA filter 310, cover 320, and annular cover 330 together constitute a replaceable filter unit 300a, which is detachably installed on the rear side of the support frame 340. The sealing ring A350 is clamped between the annular cover 330 and the support frame 340, maintaining a circumferential seal between the annular cover 330 and the support frame 340. The support frame 340 is adapted to the rear end of the dust cup 200, and the filter module 300 is detachably mounted inside the dust cup 200 via the support frame 340. The sealing ring B360 is positioned and sleeved on the support frame 340, ensuring a circumferential seal between the support frame 340 and the dust cup 200. The annular cover 330 and the support frame 340 can be detachably connected using existing methods such as snap-fit ​​or threaded connections, which will not be elaborated here. Alternatively, in this embodiment, the filter unit 300a and the support frame 340 can also be fixed together, in which case the annular cover 330 and the support frame 340 are integrated.

[0073] Combination Figure 5 The filter module 300 encloses a filter cavity 370 that is closed at the front and open at the rear. When the filter module 300 is installed inside the dust cup 200, the inner cavity of the cup body 220 is basically divided into two main parts by the filter module 300. One part is the dirt-collecting cavity 260 located outside the filter module 300, and the other part is the filter cavity 370 located inside the filter module 300. That is, the inner cavity of the dust cup 200 can be divided into the dirt-collecting cavity 260 and the filter cavity 370 by the filter module 300.

[0074] Combination Figure 6The air inlet 401 of the self-cleaning air duct 400 can be closed by the block 700, that is, the self-cleaning air duct 400 is intermittently opened by the block 700 during self-cleaning. The air outlet 402 of the self-cleaning air duct 400 is connected to the filter chamber 370. At least part of the air flowing in from the self-cleaning air duct 400 flows through the filter chamber 370 to the dirt collection chamber 260, so that at least part of the air flowing in from the self-cleaning air duct 400 can backflush the filter module 300. The front end of the main unit 100 is provided with a vent 130 for connecting the filter chamber 370 and the air intake 121. The self-cleaning air duct 400 includes a first air duct section 410 and a second air duct section 420 that are interconnected. The first air duct section 410 extends from the air inlet 401 to the second air duct section 420. The second air duct section 420 is located outside the vent 130 and is separated from the vent 130. The rear end of the second air duct section 420 is closed, and the front end is open towards the filter chamber 370. At least part of the air flowing in from the air inlet 401 can flow along the first air duct section 410 and the second air duct section 420 to the filter chamber 370, thereby smoothly forming a self-cleaning airflow CA that flows in the opposite direction through the filter module 300. The second air duct section 420 is separated from the vent 130 to prevent the air flowing in from the self-cleaning air duct 400 from directly flowing through the vent 130 to the air intake 121 of the airflow generating module 120.

[0075] Combination Figure 3 , Figure 8 Specifically, in this embodiment, the front end of the main unit 100 is provided with a bracket 610 fixed by the housing 110. The bracket 610 is located on the front side of the airflow generating module 120. The vent 130 and the self-cleaning air duct 400 are both provided on the bracket 610, so that the vent 130 and the self-cleaning air duct 400 are both located upstream of the airflow generating module 120 in the flow direction of the working airflow WA. Figure 9 , Figure 10The bracket 610 has a convex ring 611 extending forward around the vent 130 and a sleeve 612 extending backward around the vent 130. The convex ring 611 encloses the vent 130. The inner diameter of the sleeve 612 is larger than the inner diameter of the convex ring 611. The front end of the sleeve 612 is located on the outer periphery of the convex ring 611. A stepped portion 613 is provided between the convex ring 611 and the sleeve 612. The sleeve 612 is fitted onto the outer periphery of the front end of the airflow generating module 120. Through the cooperation between the sleeve 612 and the airflow generating module 120, the vent 130 and the suction port 121 are circumferentially sealed and connected, preventing air leakage between the vent 130 and the suction port 121 and ensuring the suction strength of the working airflow. To further improve the circumferential sealing effect between the sleeve 612 and the airflow generating module 120, a sealing ring C620 is provided between the inner periphery of the sleeve 612 and the outer periphery of the front end of the airflow generating module 120. The bracket 610 has a protrusion 614 extending in a direction generally perpendicular to the axial direction. One end of the protrusion 614 facing away from the center of the bracket 610 extends to the outer surface of the housing 110, and the other end of the protrusion 614 facing the center of the bracket 610 extends to the sleeve 612. A slot 615 for connecting the first air duct 410 and the second air duct 420 is provided between the end of the protrusion 614 facing the center of the bracket 610 and the sleeve 612. The stepped portion 613, the front end of the sleeve 612 and the convex ring 611 surround and form a forward-opening and annular second air duct 420. That is, the rear end of the annular second air duct 420 is closed and the front end is open towards the filter cavity 370. Vent 130 is located on the inner circumference of convex ring 611, and second air duct 420 is located on the outer circumference of vent 130. That is, vent 130 and second air duct 420 are separated circumferentially by convex ring 611, preventing all air flowing in from self-cleaning air duct 400 in self-cleaning mode from flowing directly through vent 130 to air intake 121 of airflow generating module 120. As an alternative technical solution in this embodiment, second air duct 420 can also be set in an arc shape. In this case, second air duct 420 and first air duct 410 are arranged in a one-to-one correspondence and are interconnected. The rear end of the arc-shaped second air duct 420 is closed, and the front end is open towards the filter cavity 370.

[0076] To increase the airflow from the self-cleaning duct 400 during self-cleaning mode, in this embodiment, two protrusions 614 are spaced apart circumferentially along the support 610, with the two protrusions 614 respectively located on the left and right sides of the support 610. Correspondingly, two self-cleaning ducts 400 are spaced apart circumferentially along the support 610. When the second duct portion 420 is annular, the second duct portions 420 of the two self-cleaning ducts 400 overlap; when the second duct portion 420 is arc-shaped, the second duct portions 420 of the two self-cleaning ducts 400 are spaced apart circumferentially. As an alternative technical solution to this embodiment, only one or three protrusions 614 may be provided, or other reasonable quantities may be provided.

[0077] To prevent air leakage, a sealing ring 630 is provided on the front side of the bracket 610. Specifically, the front side of the bracket 610 has a protruding edge 616 located on the outer periphery of the second air duct section 420, and the sealing ring 630 is fitted onto the front side of the bracket 610 and covers the protruding edge 616. When the dust cup 200 with the filter module 300 is attached to the main unit 100, the sealing ring 630 abuts against the rear end face of the support frame 340 in the filter module 300. The sealing ring 630 achieves a circumferential sealing fit between the filter module 300 and the front end of the main unit 100. That is, the sealing ring 630 not only keeps the filter cavity 370 and the vent 130 in a circumferential sealed connection, but also keeps the filter cavity 370 and the second air duct section 420 in a circumferential sealed connection.

[0078] To prevent impurities and dust not separated by the filter module 300 from flowing with the airflow to the airflow generating module 120, and to prevent the airflow generating module 120 from being accidentally activated when the main unit 100 is alone, resulting in foreign objects being sucked into the main unit 100, the bracket 610 has a grille frame 617 located at the vent 130 at the front end of the protrusion ring 611. A filter element 640 covering the vent 130 is provided on the front side of the grille frame 617. The filter element 640 can be fixed to the front side of the grille frame 617 by the snap fasteners 618 on the outer periphery of the grille frame 617. The filter element 640 can be made of a component with filtering function, such as a sponge. Since the filter element 640 is fixed to the front side of the grille frame 617 by the snap fasteners 618, the user can replace the filter element 640 as needed. As an alternative to this embodiment, the filter element 640 can also be fixed to the rear side of the grille frame 617.

[0079] Combination Figure 6The blocking block 700 for opening and closing the self-cleaning air duct 400 includes a main body 710. The main body 710 covers the air inlet end 401 of the self-cleaning air duct 400 from the outside of the housing 110, thereby achieving the purpose of closing the self-cleaning air duct 400. Specifically, the blocking block 700 is elastic and can be made of materials such as rubber or silicone. The main body 710 is sheet-shaped, and its external dimensions are larger than the aperture of the air inlet end 401 of the self-cleaning air duct 400, so that the main body 710 can completely and effectively cover the air inlet end 401 from the outside. In this embodiment, the main body 710 is rotatably connected to the bracket 610, so that the blocking block 700 for opening the self-cleaning air duct 400 is still connected to the bracket 610. Specifically, the block 700 has a positioning post 720 extending from the main body 710 toward the bracket 610. The bracket 610 has a positioning hole 619 on the protrusion 614 located on the rear side of the first air duct 410. The positioning post 720 is inserted into the positioning hole 619, allowing the block 700 to be flipped and connected to the bracket 610. To facilitate the user applying force to the main body 710 to open the air inlet 401 of the self-cleaning air duct 400, the block 700 has a gripping part 730 on the side of the main body 710 facing away from the self-cleaning air duct 400. The gripping part 730 is sheet-shaped, and its side away from the positioning post 720 is connected to the main body 710. When the self-cleaning air duct 400 needs to be opened, the user can pinch the gripping part 730 and apply force to it, causing the main body part 710 to detach from the protrusion 614, thereby opening the air inlet end 401 of the self-cleaning air duct 400. The main body part 710, detached from the protrusion 614, undergoes elastic deformation. When the self-cleaning air duct 400 needs to be closed, simply release the gripping part 730, and the deformed main body part 710 will automatically close the air inlet end 401 of the cleaning air duct.

[0080] Combination Figure 5 In this embodiment, the plug 270 closes the sludge inlet channel 210 in cleaning mode. Specifically, the plug 270 is elastic and has an interference fit with the socket 241. When self-cleaning is required, the sludge inlet tube 230 is removed, and then the plug 270 is inserted into the socket 241, thus closing the sludge inlet channel 210. As an alternative to this embodiment, the plug 270 can also be directly inserted into the sludge inlet tube 230 to achieve the purpose of closing the sludge inlet channel 210 during self-cleaning.

[0081] The dust cup 200 is detachably attached to the front end of the main unit 100 via a snap-fit ​​structure. The snap-fit ​​structure between the dust cup 200 and the main unit 100 can refer to existing technology and will not be elaborated here. The front end of the handle 111 is provided with a switch 140 and an operating element 150, which is operated by the user. In addition to controlling the on / off state of the switch 140 to control the start / stop of the airflow generating module 120, the operating element 150 can also be used to adjust the working intensity of the airflow generating module 120. The operating element 150 can be a push block, button, trigger, or a combination of both; no further restrictions are imposed here.

[0082] To facilitate user observation of the area to be vacuumed, a light source 160 is provided at the front of the main unit 100. The light source 160 is preferably centered on the inlet channel 210, allowing light emitted from the light source 160 to illuminate the area directly in front of the inlet channel 210. Specifically, the handheld vacuum cleaner 10 is generally symmetrical about its central axis. The central axis of the inlet channel 210 is approximately located on the central axis, and the center point of the light source 160 in the left-right direction is also approximately located on the central axis. That is, the central axis of the inlet channel 210 and the center point of the light source 160 are both approximately located on the central axis of the entire machine, thus aligning the light source 160 with the inlet channel 210. The light source 160 is preferably located above the rear end of the inlet channel 210. The light source 160 can be set to be activated by default or activated separately by the user as needed.

[0083] Combination Figure 6 In this embodiment, when the handheld vacuum cleaner 10 is working normally, the self-cleaning air duct 400 is closed by the block 700. The airflow generating module 120 draws air from the inside of the dust cup 200, creating a negative pressure state inside the dust cup 200. The self-cleaning air duct 400 is also under negative pressure. Under the action of the air pressure difference, external air flows into the dust cup 200 from the dirt inlet channel 210, forming the working airflow WA shown by the solid arrow. Dirt follows the working airflow WA into the dust cup 200. The working airflow WA passes through the filter module 300 and the vent 130. The working airflow WA flows to the airflow generating module 120. The HEPA filter 310 of the filter module 300 filters the working airflow WA. The separated dirt falls into the dirt collection chamber 260 of the dust cup 200. The filtered working airflow WA flows through the clean filter chamber 370 and the vent 130 to the air intake 121 of the airflow generating module 120. The working airflow WA flowing in from the air intake 121 passes through the air outlet 113 and is discharged from the airflow generating module 120. The working airflow WA discharged from the air outlet 113 is finally discharged from the main unit 100 through the exhaust port 122.

[0084] When self-cleaning is required, the inlet channel 210 is closed by the plug 270, the self-cleaning air duct 400 is closed by the block 700, the vacuum cleaner 10 is started, the airflow generation module 120 draws air from the inside of the dust cup 200 to make the inside of the dust cup 200 a negative pressure state, and the self-cleaning air duct 400 is also a negative pressure state. Since no external air flows in, the negative pressure inside the dust cup 200 increases. When the negative pressure inside the dust cup 200 reaches a certain level, the block 700 opens the self-cleaning air duct 400. External air flows into the self-cleaning air duct 400 from the air inlet 401. Part of the incoming air flows forward and from the clean filter chamber 370 to the dirt collection chamber 260, forming the self-cleaning airflow CA as shown by the dashed arrow. The self-cleaning airflow CA back-blowing blows the HEPA filter 310 of the filter module 300. Fine particles adsorbed on the HEPA filter 310 are blown away from the filter module 300 by the back-blowing self-cleaning airflow CA and fall into the dirt collection chamber 260, thereby achieving the self-cleaning of the filter module 300. Another part of the air can follow the working airflow WA through the vent 130 to the airflow generating module 120. In order to ensure the self-cleaning effect of the filter module 300, the user can open the self-cleaning air duct 400 multiple times and for short periods during the self-cleaning process, so that the self-cleaning air duct 400 is intermittently opened in the self-cleaning mode.

[0085] As an alternative to this embodiment, the lighting element 160 can also be located below the sewage inlet channel 210, and the lighting element 160 and the sewage inlet channel 210 can be arranged in a non-centered manner. Of course, the lighting element 160 can also be omitted entirely.

[0086] As an alternative to this embodiment, the dust cup 200 can omit the plug part 240. In this case, the insertion hole for the inlet pipe 230 is directly provided at the front end or side of the cup body 220. The plug 270 can be inserted into the insertion hole during self-cleaning to achieve the purpose of closing the inlet channel 210. The plug 270 can also be inserted into the inlet pipe during self-cleaning to achieve the purpose of closing the inlet channel 210.

[0087] As an alternative to this embodiment, the inlet pipe 230 and the cup body 220 can also be integrally formed. In this case, the plug 270 can be directly inserted into the inlet pipe 230 during self-cleaning to achieve the purpose of closing the inlet channel 210.

[0088] Combination Figure 11 As an alternative to this embodiment, the plug 700 can also be provided with a plug head 740 that cooperates with the first air duct portion 410. Preferably, the plug head 740 and the first air duct portion 410 are in an interference fit. When it is necessary to close the self-cleaning air duct 400, the plug head 740 is simply inserted into the first air duct portion 410 to block it. When it is necessary to open the self-cleaning air duct 400, the plug head 740 is pulled away from the first air duct portion 410 by pinching the gripping part 730.

[0089] Combination Figure 12 As an alternative to this embodiment, the plug 700 can simultaneously have a main body 710 and a plug head 740. The plug head 740 is located on the side of the main body 710 facing the self-cleaning air duct 400. The main body 710 can cover the air inlet end 401 of the self-cleaning air duct 400 from the outside of the housing 110. The plug head 740 can be inserted into the first air duct portion 410 of the self-cleaning air duct 400. The outer dimensions of the main body 710 are larger than the diameter of the air inlet end 401. Preferably, the plug head 740 and the first air duct portion 410 are interference-fitted. When it is necessary to close the self-cleaning air duct 400, the plug head 740 is inserted into the first air duct portion 410 and the main body 710 covers the air inlet end 401 from the outside. When it is necessary to open the self-cleaning air duct 400, the plug 700 can be completely pulled out of the self-cleaning air duct 400 by pinching the gripping part 730.

[0090] As an alternative to this embodiment, the self-cleaning air duct 400 may also be formed on the support frame 610 of the filter module 300, or the self-cleaning air duct 400 may also be formed by the rear end of the dust cup 200 and the front end of the host 100.

[0091] It is understood that the vacuum cleaner 10 in this embodiment can be not only a dry vacuum cleaner, but also a wet and dry vacuum cleaner.

[0092] It is understandable that other methods or components may be used to block or close the suction channel 210 during self-cleaning.

[0093] Understandably, when there are two or more self-cleaning air ducts 400, all of them can be opened intermittently in self-cleaning mode, either one or a portion thereof.

[0094] In addition to the preferred embodiments described above, there are other embodiments of this utility model. Those skilled in the art can make various changes and modifications based on this utility model. As long as they do not depart from the spirit of this utility model, they should all fall within the scope defined in the claims of this utility model.

Claims

1. A handheld vacuum cleaner with self-cleaning function, comprising: a main body including a casing and an air flow generating module arranged in the casing; a dust cup detachably attached to a front end of the main body, the dust cup being provided with an inlet channel; a filter module detachably installed in the dust cup; the air flow generating module working to form a working air flow flowing from the inlet channel into the dust cup and then to the air flow generating module after flowing through the filter module; characterized in that the handheld vacuum cleaner has a self-cleaning mode; the inlet channel is closed in the self-cleaning mode; a self-cleaning air duct is arranged downstream of the filter module and upstream of the air flow generating module in a flow direction of the working air flow, the self-cleaning air duct being intermittently opened in the self-cleaning mode; an inside of the dust cup is in a negative pressure state in the self-cleaning mode by air being drawn by the air flow generating module, at least part of air flowing from the opened self-cleaning air duct flows to the inside of the dust cup through the filter module to form a self-cleaning air flow, a flow direction of the self-cleaning air flow being opposite to the flow direction of the working air flow.

2. The hand vacuum cleaner with a self-cleaning function according to claim 1, characterized in that, an inner cavity of the dust cup is divided into a dirt holding cavity and a filter clean cavity by the filter module, an air inlet end of the self-cleaning air duct is closed by a blocking piece, an air outlet end of the self-cleaning air duct is communicated with the filter clean cavity, at least part of air flowing from the self-cleaning air duct flows to the dirt holding cavity through the filter clean cavity.

3. The hand vacuum cleaner with a self-cleaning function according to claim 2, characterized in that, a front end of the air flow generating module is provided with a suction port, a front end of the main body is provided with a ventilation port for connecting the filter clean cavity and the suction port, the self-cleaning air duct includes a first air duct part and a second air duct part which are communicated with each other, the first air duct part extends from the air inlet end to the second air duct part, the second air duct part is arranged outside the ventilation port and is spaced apart from the ventilation port, a rear end of the second air duct part is closed, and a front end of the second air duct part is open towards the filter clean cavity.

4. The hand vacuum cleaner with a self-cleaning function according to claim 3, characterized in that, an outer periphery of the ventilation port has a protruding ring extending forward around the ventilation port, the second air duct part of the self-cleaning air duct is located outside the protruding ring, the second air duct part of the self-cleaning air duct is spaced apart from the ventilation port by the protruding ring; and / or, an outer periphery of the second air duct part is provided with a butt sealing ring, the butt sealing ring can abut against a rear end of the filter module to keep the second air duct part and the filter clean cavity in circumferential sealing communication.

5. The hand vacuum cleaner with a self-cleaning function according to claim 3, wherein, a grille frame and a filter element are arranged at the ventilation port, the filter element is arranged on the grille frame and covers the ventilation port; and / or, an outer periphery of the ventilation port has a sleeve extending rearward around the ventilation port, the sleeve is sleeved on an outer periphery of the air flow generating module.

6. The hand vacuum cleaner with a self-cleaning function according to claim 3, wherein, a front end of the main body is provided with a support fixed by the casing, the ventilation port and the self-cleaning air duct are arranged on the support; and / or, the self-cleaning air duct is spaced apart by a plurality of parts along a circumference of the main body.

7. The hand vacuum cleaner with a self-cleaning function according to claim 2, wherein the blocking piece is provided with a main body part capable of closing the air inlet end of the self-cleaning air duct from the outside, a size of the main body part is greater than a hole diameter of the air inlet end of the self-cleaning air duct; and / or, the blocking piece is provided with a plug part capable of being inserted into the air inlet end of the self-cleaning air duct, the plug part is in interference fit with the air inlet end of the self-cleaning air duct.

8. The hand vacuum cleaner with a self-cleaning function according to claim 2, wherein, the blocking piece is elastic; and / or, a side of the blocking piece away from the self-cleaning air duct is provided with a pinch part capable of being pinched.

9. The hand vacuum cleaner with a self-cleaning function according to claim 1, wherein, The dust cup comprises a cup body and a dirt inlet pipe, at least a part of the dirt inlet channel is arranged on the dirt inlet pipe, the cup body is provided with a socket matched with the dirt inlet pipe, the rear end of the dirt inlet pipe is detachably inserted into the socket, the dirt inlet pipe is separated from the socket in the self-cleaning mode and the socket inserted into the socket is closed; or the dust cup comprises a cup body and a dirt inlet pipe, at least a part of the dirt inlet channel is arranged on the dirt inlet pipe, the dirt inlet pipe is closed by the plug inserted into the dirt inlet pipe in the cleaning mode.

10. The hand vacuum cleaner with a self-cleaning function according to claim 1, wherein, The front end of the main machine is provided with an illuminating part, and the illuminating part is arranged in the center of the dirt inlet channel.

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