Dust collector

Abstract

The dust collector comprises a motor, a filter and a valve device, the valve device comprises a valve plate, a pressure relief mechanism and a driving mechanism, and the valve plate opens an air outlet duct and closes a self-cleaning duct when located at a first position and closes the air outlet duct and opens the self-cleaning duct when located at a second position; when the valve plate is located at the first position and the second position, the pressure relief mechanism closes the pressure relief opening between the self-cleaning air duct and the outside, and the pressure relief opening is opened in the process that the valve plate moves from the first position to the second position. In the self-cleaning process, the pressure relief opening is only temporarily opened in the switching process of the valve device, on one hand, switching resistance in the negative pressure state is reduced, it is ensured that the dust collector can be smoothly switched to the self-cleaning state, and on the other hand, gas leakage of the dust collector in the normal working state or the self-cleaning state is avoided; suction stability in the normal working state is guaranteed, the self-cleaning process of the filter is efficient and smooth, and more convenient and efficient use experience is provided for consumers.

Description

Technical Field

[0001] This utility model relates to the field of vacuum cleaners, and more particularly to a vacuum cleaner with a filter cleaning function. Background Technology

[0002] Traditional vacuum cleaner designs rely on users regularly cleaning the filter to ensure proper operation. However, if the filter isn't cleaned promptly or thoroughly, it can easily become clogged, leading to reduced suction power and hindering efficient cleaning. Especially after prolonged use, the effectiveness of manual filter cleaning significantly decreases, resulting in a substantial drop in suction power and cleaning efficiency, ultimately requiring users to purchase new filters for replacement.

[0003] Some existing vacuum cleaners can achieve a self-cleaning mode by changing the airflow direction, enabling automatic cleaning of the filter. However, some areas inside the vacuum cleaner are under negative pressure during operation, making it difficult to easily change the airflow direction. A large driving force is required to alter the airflow direction. Furthermore, solving this problem may introduce new issues, such as air leaks leading to reduced cleaning or self-cleaning efficiency. Therefore, these issues negatively impact the user experience. Summary of the Invention

[0004] To address the cleaning problem of filters in existing vacuum cleaners, the purpose of this invention is to provide a vacuum cleaner that allows for easier changes in gas flow direction during the self-cleaning process without causing new problems such as air leakage.

[0005] To achieve the above-mentioned utility model objectives, one embodiment of this utility model provides a vacuum cleaner, comprising:

[0006] An electric motor is used to generate negative pressure to form an air duct;

[0007] A filter, disposed in the air duct, is used to filter dirt in the fluid. When the vacuum cleaner is in the first mode, the airflow passes through the filter in the forward direction and is discharged through the air outlet duct. When the vacuum cleaner is in the second mode, the airflow passes through the filter in the reverse direction through the self-cleaning air duct.

[0008] A valve device is used to open the air outlet duct and close the self-cleaning duct when the vacuum cleaner is in a first mode, and to close the air outlet duct and open the self-cleaning duct when the vacuum cleaner is in a second mode.

[0009] The valve device includes:

[0010] The valve plate is used to open the air outlet duct and close the self-cleaning duct when it is in the first position, and to close the air outlet duct and open the self-cleaning duct when it is in the second position.

[0011] The pressure relief mechanism is used to close the pressure relief port between the self-cleaning air duct and the outside when the valve plate is in the first position, open the pressure relief port during the process of the valve plate moving away from the first position to the second position, and close the pressure relief port again when the valve plate is in the second position.

[0012] A drive mechanism is used to drive the valve plate and the pressure relief mechanism to move synchronously.

[0013] As a further improvement of this utility model, the pressure relief mechanism includes:

[0014] A pressure relief plate is used to close the pressure relief port when the valve plate is in the first position, and to open the pressure relief port when the valve plate leaves the first position and has not reached the second position.

[0015] A sealing element for closing the pressure relief port when the valve plate is in the second position;

[0016] The drive mechanism drives the valve plate, the pressure relief plate, and the seal to move synchronously.

[0017] As a further improvement of this utility model, the valve device further includes a valve stem, which is sequentially connected to the valve plate, the pressure relief plate, and the sealing element, and is connected to the drive mechanism at its end. There is a gap between the valve stem and the pressure relief port. When the valve stem drives the pressure relief plate to open the pressure relief port, the self-cleaning air duct communicates with the outside through the gap. When the valve stem drives the sealing element to close the pressure relief port, or when the pressure relief plate closes the pressure relief port, the gap is sealed.

[0018] The valve plate opens or closes the first air outlet of the air outlet duct, the valve plate opens or closes the second air outlet of the self-cleaning air duct, and the pressure relief port is arranged sequentially along the extension direction of the valve stem.

[0019] As a further improvement of this utility model, a sealing ring is provided on the outer wall surface or valve plate surrounding the first air outlet. When the valve plate is in the second position and closes the air outlet duct, the sealing ring abuts against the outer wall surface and the valve plate, and the abutment forms a closed surface that seals the first air outlet.

[0020] As a further improvement of this utility model, the second air outlet includes a through hole and a plurality of air holes located around the through hole. The valve stem passes through the through hole, and when the valve plate is in the second position and opens the self-cleaning air duct, the plurality of air holes are opened.

[0021] The sum of the opening areas of the plurality of air vents is less than the opening area of ​​the first air vent.

[0022] As a further improvement of this utility model, the valve plate includes an elastic sealing member facing the second air outlet, and the elastic sealing member includes a negative pressure wall facing the outer wall surface of the plurality of air holes. The negative pressure wall surrounds a negative pressure cavity. When the valve plate is in the first position and closes the self-cleaning air duct, the negative pressure wall is in contact with the outer wall surface of the plurality of air holes, and the negative pressure cavity is in a negative pressure state.

[0023] As a further improvement of this utility model, the vacuum cleaner includes a valve seat, which includes an upper seat and a lower seat. The upper seat and the lower seat respectively enclose the second air inlet and the pressure relief port, and the valve device is fastened between the upper seat and the lower seat.

[0024] As a further improvement of this utility model, the upper seat and the lower seat together enclose a return air cavity, the second air outlet and the pressure relief port are respectively arranged on both sides of the return air cavity, the filter is located below the return air cavity, and the drive mechanism is arranged on the side of the pressure relief port away from the return air cavity.

[0025] As a further improvement of this utility model, a first sealing gasket is provided on the side of the pressure relief plate facing the pressure relief port, and a second sealing gasket is provided on the side of the sealing member facing the pressure relief port.

[0026] When the pressure relief plate closes the pressure relief port, the outer edge of the pressure relief port facing the pressure relief plate is sealed and abuts against the first sealing gasket.

[0027] When the seal closes the pressure relief port, the outer edge of the pressure relief port facing the seal comes into sealing contact with the second sealing gasket.

[0028] As a further improvement of this utility model, the opening area of ​​the pressure relief port is smaller than the opening area of ​​the second air outlet.

[0029] Compared with commonly used technologies, this invention has the following advantages: The vacuum cleaner can automatically self-clean, preventing filter clogging and performance degradation. During self-cleaning, the pressure relief port only opens briefly during valve switching, reducing switching resistance under negative pressure and ensuring smooth transition to self-cleaning mode. It also prevents gas leakage during normal operation or self-cleaning, ensuring stable suction power and focused airflow for efficient cleaning of the filter. Therefore, this vacuum cleaner reduces user maintenance, extends its lifespan and cleaning effectiveness, and provides a more convenient and efficient user experience through its efficient and smooth filter self-cleaning process. Attached Figure Description

[0030] Figure 1 This is a top view of a vacuum cleaner in a first state according to an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0032] Figure 3 This is a top view of a vacuum cleaner in a second state according to an embodiment of the present invention;

[0033] Figure 4 yes Figure 1 A partial structural cross-sectional view of the vacuum cleaner in the first state along the AA direction;

[0034] Figure 5 yes Figure 1 A partial structural cross-sectional view of the vacuum cleaner in the second state along the AA direction;

[0035] Figure 6 yes Figure 1 A partial structural cross-sectional view of the vacuum cleaner along the BB direction in the first state;

[0036] Figure 7 yes Figure 1 A partial structural cross-sectional view of the vacuum cleaner in the second state along the BB direction;

[0037] Figure 8 This is a schematic diagram of a portion of the structure of a vacuum cleaner according to an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of the structure of the second air outlet according to an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram of the sealing mechanism according to an embodiment of the present invention;

[0040] Figure 11 This is a cross-sectional view of a sealing mechanism according to an embodiment of the present invention;

[0041] Among them, 100 is a vacuum cleaner; 10 is a motor; 20 is a filter; 30 is an air outlet duct; 40 is a valve device; 41 is a valve plate; 411 is an elastic seal; 42 is a pressure relief plate; 421 is a first sealing gasket; 43 is a sealing element; 431 is a second sealing gasket; 44 is a valve stem; 50 is a valve seat; 51 is a first air outlet; 52 is a second air outlet; 521 is a through hole; 522 is an air hole; 53 is a pressure relief port; 531 is a gap; 54 is a return air chamber; 55 is an upper seat; 56 is a lower seat; 57 is a sealing ring; 60 is a drive mechanism; S1 is a first mode; S2 is a second mode. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0043] It should be understood that terms such as “above,” “over,” “below,” and “under” used herein to indicate spatial relative position are for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms “spatial relative position” may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0044] One embodiment of this utility model provides a vacuum cleaner that allows for easier changes in the flow direction of gas during the self-cleaning process without causing new problems such as air leakage.

[0045] A vacuum cleaner 100 according to this embodiment includes a motor 10, a filter 20 and a valve device 40, wherein the motor 10 is used to generate negative pressure to form an air duct, the filter 20 is disposed in the air duct and is used to filter dirt in the fluid. When the vacuum cleaner 100 is in the first mode S1, the airflow passes through the filter 20 in the forward direction and is discharged through the air outlet duct 30. When the vacuum cleaner 100 is in the second mode S2, the airflow passes through the filter 20 in the reverse direction through the self-cleaning air duct to clean its surface.

[0046] The first mode, S1, is the standard cleaning mode of the vacuum cleaner 100. Figure 1 , 4 As shown, the second mode S2 is the self-cleaning mode, as... Figure 3 , 5 As shown. The valve device 40 is used to open the air outlet duct 30 and close the self-cleaning duct when the vacuum cleaner 100 is in the first mode S1, and to close the air outlet duct 30 and open the self-cleaning duct when the vacuum cleaner 100 is in the second mode S2.

[0047] Valve assembly 40 includes valve plate 41, pressure relief mechanism, and drive mechanism 60. Valve plate 41 is used to, when in the first position, such as Figure 1 , 2 As shown in Figure 6, with the air outlet duct 30 open and the self-cleaning duct closed, in the second position, as follows: Figure 3 , 7 As shown, the air outlet duct 30 is closed and the self-cleaning duct is opened; the pressure relief mechanism is used to close the pressure relief port 53 between the self-cleaning duct and the outside when the valve plate 41 is in the first position, open the pressure relief port 53 during the process of the valve plate 41 moving from the first position to the second position, and close the pressure relief port 53 again when the valve plate 41 is in the second position; the drive mechanism 60 is used to drive the valve plate 41 and the pressure relief mechanism to move synchronously.

[0048] The pressure relief mechanism briefly opens the pressure relief port 53 during the switching of the valve plate 41. When the valve plate 41 is in the first or second position, the pressure relief port 53 remains closed to ensure sealing performance in normal operation and self-cleaning modes. However, when the valve plate 41 moves from the first position to the second position (or vice versa), the pressure relief mechanism temporarily opens the pressure relief port 53 to release the internal negative pressure, allowing it to quickly equalize with the external air pressure, thereby reducing the driving force required for the valve plate 41 to switch under negative pressure. Once the valve plate 41 reaches the target position, the pressure relief port 53 is immediately closed again, restoring the system's sealing state.

[0049] By briefly opening the pressure relief port 53, the negative pressure inside the vacuum cleaner 100 is balanced with the external air pressure, effectively reducing the driving force required by the valve plate 41 during switching. This design not only ensures smooth switching between the first mode S1 and the second mode S2, but also avoids switching jamming problems that may occur under high negative pressure conditions, thereby improving the reliability of the vacuum cleaner 100. Furthermore, the pressure relief port 53 remains closed during normal cleaning and self-cleaning modes, preventing airflow leakage from affecting the performance of the vacuum cleaner 100. This optimized design improves the self-cleaning efficiency of the filter 20 while ensuring the efficiency of regular cleaning, providing users with a more stable and efficient cleaning experience.

[0050] Furthermore, such as Figure 2 , 6 As shown in Figures 7, 10, and 11, the pressure relief mechanism includes a pressure relief plate 42 and a sealing element 43. The pressure relief plate 42 closes the pressure relief port 53 when the valve plate 41 is in the first position to prevent external gas from entering the interior; when the valve plate 41 leaves the first position but has not reached the second position, it opens the pressure relief port 53 to release the negative pressure inside the vacuum cleaner 100, balance the internal and external air pressures, and reduce resistance during the switching process. The sealing element 43, when the valve plate 41 is in the second position, precisely closes the pressure relief port 53 through the synchronous action of the drive mechanism 60, ensuring the sealing performance of the vacuum cleaner 100 in self-cleaning mode. The drive mechanism 60 drives the valve plate 41, pressure relief plate 42, and sealing element 43 to move synchronously.

[0051] Through the coordinated design of the pressure relief plate 42 and the seal 43, the pressure relief mechanism can effectively control the opening and closing state of the pressure relief port 53, briefly balancing the air pressure during the switching process of the valve plate 41, reducing switching resistance, and improving the smoothness and efficiency of switching. In normal working mode and self-cleaning mode, the pressure relief port 53 remains completely sealed, avoiding the impact of gas leakage on the performance of the vacuum cleaner 100, thereby achieving efficient self-cleaning function and stable working mode switching.

[0052] Valve assembly 40 also includes valve stem 44, such as Figure 2 ,5 As shown in Figures 6, 7, 9, 10, and 11, the valve stem 44 is sequentially connected to the valve plate 41, the pressure relief plate 42, and the seal 43, and is connected to the drive mechanism 60 at its end. A gap 531 exists between the valve stem 44 and the pressure relief port 53. When the valve stem 44 drives the pressure relief plate 42 to open the pressure relief port 53, the gap 531 allows the self-cleaning air duct to briefly connect to the outside, releasing the internal negative pressure. When the valve stem 44 drives the seal 43 to close the pressure relief port 53, or when the pressure relief plate 42 closes the pressure relief port 53, the gap 531 is closed, restoring the system's sealing performance. The design of the valve stem 44, through the combination of the gap 531 and the pressure relief port 53, provides an instantaneous path for negative pressure release, further reducing switching resistance and ensuring smooth movement of the valve plate 41 in high negative pressure environments.

[0053] The valve plate 41 opens or closes the first air outlet 51 of the air outlet duct 30 (corresponding to the air outlet duct 30), the valve plate 41 opens or closes the second air outlet 52 of the self-cleaning duct (corresponding to the self-cleaning duct), and the pressure relief port 53 are sequentially arranged along the extension direction of the valve stem 44. This ensures a compact structure and reasonable functional allocation, optimizes the structural compactness of the valve device 40, reduces space occupation, and improves working efficiency. Through the closing and releasing control of the gap 531, the airtightness of the pressure relief port 53 and the connection stability of the self-cleaning duct are guaranteed.

[0054] Furthermore, a sealing ring 57 is provided on the outer wall surface of the first air outlet 51 or on the valve plate 41 to achieve efficient sealing when the valve plate 41 is in the second position and the air outlet duct 30 is closed. The sealing ring 57 improves the sealing performance of the air outlet duct 30, ensuring that the airflow of the vacuum cleaner 100 in self-cleaning mode can completely pass through the self-cleaning duct and act on the surface of the filter 20, avoiding any airflow dispersion and leakage.

[0055] When the valve plate 41 is in the second position and closes the air outlet duct 30, the sealing ring 57 abuts against the outer wall surface and the valve plate 41, and the abutment forms a closed surface that seals the first air outlet 51. When the valve plate 41 moves to the second position, the sealing ring 57 fits tightly between the outer wall surface and the valve plate 41 to ensure the complete closure of the first air outlet 51 and prevent gas leakage.

[0056] like Figure 9As shown, the second air outlet 52 includes a through hole 521 and multiple air holes 522 located around the through hole 521. The valve stem 44 passes through the through hole 521. When the valve plate 41 is in the second position and opens the self-cleaning air duct, the multiple air holes 522 are opened. The through hole 521 is used for the guide rod to pass through, ensuring the movement of the guide rod in its length direction. The multiple air holes 522 are arranged around the through hole 521 to guide airflow through the self-cleaning air duct into the filter 20 when the valve plate 41 is in the second position. Through the combined design of the through hole 521 and the multiple air holes 522, the second air outlet 52 can effectively distribute airflow in the self-cleaning mode, improving the cleaning effect of the airflow on the surface of the filter 20.

[0057] In this embodiment, the sum of the opening areas of the multiple air vents 522 is less than the opening area of ​​the first air vent 51.

[0058] During normal vacuuming operations, the main airflow direction is through the first vent 51 to exhaust to the outside. Since its primary function is exhaust, maximizing the opening area helps improve airflow rate and exhaust efficiency. The first vent 51 is mainly used to exhaust this airflow, therefore it requires a large opening area to ensure unobstructed airflow.

[0059] The total opening area of ​​the multiple air holes 522 is smaller than the area of ​​the first air outlet 51 because of the air pressure requirements during the self-cleaning process. In the self-cleaning function, it is necessary to ensure that the filter 20 receives sufficient air pressure during cleaning, guaranteeing that the airflow has enough power and pressure to remove dust and impurities adhering to the surface of the filter 20. If the opening area of ​​the multiple air holes 522 is too large, the airflow will be too dispersed, the air pressure will decrease, and the self-cleaning effect will be poor. The smaller opening area of ​​the multiple air holes 522 helps to increase the local concentration of airflow, allowing the airflow to maintain a higher pressure near the filter 20, thereby more effectively removing debris adhering to the filter 20. Therefore, by limiting the area of ​​the air holes 522, the airflow pressure can be effectively increased, enhancing the impact force on the surface of the filter 20, helping dust to fall off more easily during the cleaning process, and improving the self-cleaning efficiency of the filter 20.

[0060] Furthermore, the valve plate 41 includes a resilient seal 411 facing the second air vent 52, such as... Figure 10 and 11 As shown, the elastic seal 411 includes a negative pressure wall facing the outer wall surface of the plurality of air holes 522, and a negative pressure cavity is formed inside the negative pressure wall. When the valve plate 41 is in the first position and closes the self-cleaning air duct, the negative pressure wall is in contact with the outer wall surface of the plurality of air holes 522, and the negative pressure cavity is in a negative pressure state.

[0061] like Figure 11As shown, the cross-section of the negative pressure wall is U-shaped. The design of the elastic seal 411 and the negative pressure wall ensures the airtightness of the second air vent 52 while providing excellent sealing performance. In the first position, the U-shaped opening fits against the outer wall surface, and the negative pressure state in the negative pressure chamber effectively prevents airflow from entering the second air vent 52, preventing airflow leakage and improving the working efficiency of the vacuum cleaner 100.

[0062] Furthermore, such as Figure 8 and 9 As shown, the vacuum cleaner 100 includes a valve seat 50, which includes an upper seat 55 and a lower seat 56. The upper seat 55 and the lower seat 56 respectively enclose a second air inlet 52 and a pressure relief port 53. The valve device 40 is fastened between the upper seat 55 and the lower seat 56.

[0063] The upper seat 55 and lower seat 56 are joined together to form an integrated structure, facilitating the installation and fixation of the valve device 40. The joining of the upper seat 55 and lower seat 56 creates a through hole 521 and a pressure relief port 53 that mate with the valve stem 44, supporting and guiding the valve stem 44 along its length. This combination simplifies the assembly process of the valve device 40, improves the maintainability and assemblability of the valve seat 50, and allows for quick installation or disassembly of the pressure relief mechanism, facilitating subsequent maintenance and replacement. Furthermore, it enhances the overall structural stability, ensuring the valve device 40 is securely positioned between the upper seat 55 and lower seat 56. The enclosed second air vent 52 and pressure relief port 53 provide efficient sealing, ensuring airflow stability in both self-cleaning and normal operating modes. In addition, this design allows the valve seat 50 to accommodate pressure relief mechanisms of different sizes or shapes.

[0064] like Figure 8 As shown, the upper seat 55 and the lower seat 56 enclose the return air cavity 54. The second air outlet 52 and the pressure relief outlet 53 are respectively located on both sides of the return air cavity 54. The filter 20 is located below the return air cavity 54, and the drive mechanism 60 is located on the side of the pressure relief outlet 53 away from the return air cavity 54.

[0065] The return air chamber 54 guides airflow to focus on the filter 20 in self-cleaning mode. The optimized placement of the return air chamber 54 and the reasonable distribution of the second air outlet 52 and pressure relief port 53 ensure smooth airflow and stable operation, thereby improving the self-cleaning effect of the filter 20. Furthermore, the drive mechanism 60's location away from the internal airflow path prevents dust from being blown into it, improving its reliability and lifespan, and enhancing the user experience.

[0066] Furthermore, such as Figure 10 and 11As shown, a first sealing gasket 421 is provided on the side of the pressure relief plate 42 facing the pressure relief port 53, and a second sealing gasket 431 is provided on the side of the sealing element 43 facing the pressure relief port 53. When the pressure relief plate 42 closes the pressure relief port 53, the outer edge of the pressure relief port 53 facing the pressure relief plate 42 seals against the first sealing gasket 421. When the sealing element 43 closes the pressure relief port 53, the outer edge of the pressure relief port 53 facing the sealing element 43 seals against the second sealing gasket 431. This dual-sealing design ensures that the pressure relief port 53 maintains good sealing performance in different states. Whether it is the seal between the pressure relief plate 42 and the pressure relief port 53 or the seal between the sealing element 43 and the pressure relief port 53, airflow leakage can be effectively avoided, ensuring the working efficiency and cleaning performance of the vacuum cleaner 100. This significantly improves the sealing performance of the pressure relief port 53 in both positions, enhances the reliability of the equipment, and provides users with a more stable and efficient product experience.

[0067] In this embodiment, the opening area of ​​the pressure relief port 53 is smaller than the opening area of ​​the second air vent 52. According to Pascal's law, since the area of ​​the pressure relief port 53 is smaller, a smaller force can be used to drive the pressure relief plate 42 to open the pressure relief port 53, making the switching process between the first mode S1 and the second mode S2 smoother.

[0068] The following explains the switching process from the first mode S1 to the second mode S2:

[0069] First Mode S1

[0070] In the normal operating mode of the vacuum cleaner 100, the valve plate 41 is in the first position. For example... Figure 2 , 4 As shown in Figure 6, at this time, valve plate 41 opens the air outlet duct 30, and airflow flows forward from filter 20, exiting to the outside through air outlet duct 30. Simultaneously, the self-cleaning duct is closed by valve plate 41, and pressure relief plate 42 seals pressure relief port 53, ensuring a complete seal and preventing any airflow from entering the self-cleaning duct from the air outlet duct 30 or the outside. This design ensures that the suction power of the vacuum cleaner 100 in normal operating mode is concentrated on cleaning dirt on the floor, while avoiding the impact of airflow leakage on work efficiency.

[0071] The process of switching from mode S1 to mode S2

[0072] When the vacuum cleaner 100 needs to switch from normal operating mode to self-cleaning mode, the drive mechanism 60 starts to operate. The drive mechanism 60 drives the valve plate 41, pressure relief plate 42, and seal 43 to move synchronously via the valve stem 44. In the initial stage of movement, the pressure relief plate 42 opens the pressure relief port 53 to balance the internal air pressure of the self-cleaning air duct with the external air pressure, reducing the negative pressure resistance during the switching process and ensuring that the valve plate 41 can move smoothly from the first position to the second position. At this time, the self-cleaning air duct gradually opens, while the exhaust air duct 30 gradually closes, making the switching process efficient and smooth.

[0073] Second Mode S2

[0074] like Figure 3 , 5 As shown in Figure 7, after the valve plate 41 moves to the second position, the seal 43 precisely fits against the edge of the pressure relief port 53, completely sealing the pressure relief port 53 and restoring the system to a sealed state. At this time, the air outlet duct 30 is completely closed by the valve plate 41, while the self-cleaning duct is fully opened. After the airflow is generated by the motor 10, it acts in the opposite direction on the surface of the filter 20 through the self-cleaning duct, thereby cleaning the filter 20.

[0075] Compared with the prior art, this embodiment has the following beneficial effects:

[0076] The vacuum cleaner 100 can automatically self-clean, preventing the filter 20 from becoming clogged and causing a decrease in its performance. During self-cleaning, the pressure relief port 53 only opens briefly during valve switching, reducing switching resistance under negative pressure and ensuring a smooth transition to self-cleaning mode. This also prevents gas leakage during normal operation or self-cleaning, ensuring stable suction during normal operation and concentrating the self-cleaning airflow onto the filter 20 for efficient cleaning. Therefore, the vacuum cleaner 100 not only reduces user maintenance workload and extends its lifespan and cleaning effectiveness, but also provides a more convenient and efficient user experience by ensuring a smooth and efficient self-cleaning process for the filter 20.

[0077] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0078] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dust collector comprising: a motor for generating negative pressure to form an air duct; a filter arranged in the air duct for filtering dirt in fluid, when the dust collector is in a first mode, air flow passes through the filter in a forward direction and is discharged through an air outlet duct, when the dust collector is in a second mode, air flow passes through the filter in a reverse direction through a self-cleaning air duct; a valve device for opening the air outlet duct and closing the self-cleaning air duct when the dust collector is in the first mode, and for closing the air outlet duct and opening the self-cleaning air duct when the dust collector is in the second mode; characterized in that the valve device comprises: a valve plate for opening the air outlet duct and closing the self-cleaning air duct when in a first position, and for closing the air outlet duct and opening the self-cleaning air duct when in a second position; a pressure relief mechanism for closing a pressure relief port between the self-cleaning air duct and the outside when the valve plate is in the first position, for opening the pressure relief port during movement of the valve plate from the first position to the second position, and for closing the pressure relief port again when the valve plate is in the second position; a drive mechanism for driving the valve plate and the pressure relief mechanism to move synchronously.

2. The dustsucker according to claim 1, characterized in that, The pressure relief mechanism comprises: a pressure relief plate for closing the pressure relief port when the valve plate is in the first position, and for opening the pressure relief port when the valve plate is moving from the first position to the second position; a seal for closing the pressure relief port when the valve plate is in the second position; wherein the drive mechanism drives the valve plate, the pressure relief plate and the seal to move synchronously.

3. The dustsucker according to claim 2, characterized in that, The valve device further comprises a valve rod connected to the valve plate, the pressure relief plate and the seal in sequence, and connected to the drive mechanism at an end portion, and a gap exists between the valve rod and the pressure relief port, the self-cleaning air duct is connected to the outside through the gap when the valve rod drives the pressure relief plate to open the pressure relief port, and the gap is closed when the valve rod drives the seal to close the pressure relief port or the pressure relief plate to close the pressure relief port; The first air port of the valve plate for opening or closing the air outlet duct, the second air port of the valve plate for opening or closing the self-cleaning air duct, and the pressure relief port are arranged in sequence along the extension direction of the valve rod.

4. The dust cup according to claim 3, wherein A sealing ring is arranged on the outer wall surface surrounding the first air port or the valve plate, and the sealing ring abuts between the outer wall surface and the valve plate when the valve plate is in the second position to close the air outlet duct, and a closed surface closing the first air port is formed at the abutting position.

5. The dust cup according to claim 3, wherein The second air port comprises a through hole and a plurality of air holes arranged around the through hole, and the valve rod passes through the through hole, and the plurality of air holes are opened when the valve plate is in the second position to open the self-cleaning air duct; The sum of the opening areas of the plurality of air holes is less than the opening area of the first air port.

6. The dust cup according to claim 5, wherein The valve plate comprises an elastic seal towards the second air outlet, the elastic seal comprises a negative pressure wall towards the outer wall surface of the plurality of air holes, the negative pressure wall encloses a negative pressure cavity, when the valve plate is in the first position to close the self-cleaning air duct, the negative pressure wall is in close contact with the outer wall surface of the plurality of air holes, and the negative pressure cavity is in a negative pressure state.

7. The dust cup according to claim 3, wherein The dust collector comprises a valve seat, the valve seat comprises an upper seat and a lower seat, the upper seat and the lower seat respectively enclose the second air outlet and the pressure relief port, and the valve device is clamped between the upper seat and the lower seat.

8. The dust cup according to claim 7, wherein The upper seat and the lower seat enclose a return air cavity, the second air outlet and the pressure relief port are respectively arranged on two sides of the return air cavity, the filter is located below the return air cavity, and the driving mechanism is arranged on a side of the pressure relief port away from the return air cavity.

9. The dustsucker according to claim 8, characterized in that The pressure relief plate is provided with a first sealing gasket on a side thereof towards the pressure relief port, and the seal is provided with a second sealing gasket on a side thereof towards the pressure relief port. When the pressure relief plate closes the pressure relief port, an outer edge of the pressure relief port on a side thereof towards the pressure relief plate is in sealing abutment with the first sealing gasket. When the seal closes the pressure relief port, an outer edge of the pressure relief port on a side thereof towards the seal is in sealing abutment with the second sealing gasket.

10. The dust cup according to claim 3, wherein The opening area of the pressure relief port is smaller than the opening area of the second air outlet.

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