Dust collector

Abstract

The utility model provides a dust collector, include: bucket body, machine head, and bucket body enclose into dust collecting chamber, machine head includes: casing, be equipped with filter cavity and fan cavity in the casing, filter cavity is equipped with with outside communication's air supplement mouth, filter, filter is located in filter cavity, fan, fan is located in fan cavity, when fan operation pushes airflow from dust collecting chamber to filter cavity to fan cavity to form negative pressure in dust collecting chamber, air supplement valve, air supplement valve is used for selectively opens or close air supplement mouth, when air supplement mouth opens, under the action of negative pressure in dust collecting chamber, outside airflow from air supplement mouth to dust collecting chamber through filter, wherein, machine head still includes pressure relief valve, still be equipped with pressure relief cavity in the casing, pressure relief cavity is equipped with with outside communication's pressure relief mouth, pressure relief valve is used for selectively opens or close pressure relief mouth, pressure relief cavity is located between filter cavity to fan cavity, and is communicated with airflow path from filter cavity to fan cavity.

Description

Technical Field

[0001] This utility model relates to the field of vacuum cleaners, specifically to a vacuum cleaner with a self-cleaning filter. Background Technology

[0002] A vacuum cleaner is a device that uses the negative pressure generated by the high-speed rotation of fan blades to suck up small objects from the suction port to achieve cleaning. A traditional vacuum cleaner includes a dust collection chamber connected to the suction port, a filter chamber containing a filter, and a fan chamber that creates negative pressure. The dust collection chamber, filter chamber, and fan chamber are interconnected to form a flow channel that allows fluid carrying dust, debris, etc., to pass through. The fluid enters the dust collection chamber through the suction port, where larger debris remains due to gravity. The fluid then passes through the filter chamber, where smaller dust and debris are trapped. Afterward, the fluid flows through the fan chamber to the air outlet located on the vacuum cleaner casing and finally into the atmosphere. This is how a vacuum cleaner performs its suction function.

[0003] Traditional vacuum cleaners also include an air inlet in the aforementioned flow path. When the motor stops driving the fan, air can be supplied to the flow channel through the air inlet to balance the pressure difference inside and outside the vacuum cleaner. The air inlet also allows the supplied air to blow away the filter, causing dust and debris trapped in the filter to fall into the dust collection chamber.

[0004] However, when the motor stops driving the fan, a significant negative pressure exists in the aforementioned flow channel, making it difficult to open the air inlet. Simultaneously, the negative pressure in the flow channel causes the air supply fluid to impact the filter at a high velocity, potentially damaging the filter (e.g., cracking or deformation), thus increasing unnecessary replacement and maintenance costs. Utility Model Content

[0005] In view of this, the present invention provides a vacuum cleaner, comprising: a barrel body; a head, the head and the barrel body forming a dust collection chamber, the head comprising: a housing, the housing having a filter chamber and a fan chamber, the filter chamber having an air inlet communicating with the outside; a filter; the filter being located within the filter chamber; a fan, the fan being located within the fan chamber, the fan driving airflow from the dust collection chamber through the filter chamber to the fan chamber during operation, thereby creating negative pressure within the dust collection chamber; an air inlet valve, the air inlet valve being used to selectively open or close the air inlet, when the air inlet is open, under the negative pressure within the dust collection chamber, external airflow flows from the air inlet through the filter to the dust collection chamber; wherein, the head also includes a pressure relief valve, the housing having a pressure relief chamber having a pressure relief port communicating with the outside, the pressure relief valve being used to selectively open or close the pressure relief port, the pressure relief chamber being located between the filter chamber and the fan chamber, and communicating with the airflow path from the filter chamber to the fan chamber.

[0006] The vacuum cleaner provided by this utility model includes a pressure relief chamber disposed between a filter chamber and a fan chamber. The pressure relief chamber includes a pressure relief port and a pressure relief valve that can selectively open or close the pressure relief port. When the motor stops driving the fan, the pressure relief valve can be controlled to open the pressure relief port, allowing the pressure relief chamber to connect with the external environment. External gas flows into the fan chamber and filter chamber under the negative pressure of the airflow path, thereby reducing the negative pressure in the airflow path and making it easier to open the air supply valve.

[0007] Furthermore, due to the reduced negative pressure within the filter chamber, when the air inlet is opened, the incoming air fluid will impact the filter at a lower flow rate. This improves the filter's lifespan. When the filter is thinner, such as when it includes filter paper or a screen, this design also ensures the filter's position within the housing remains relatively stable, guaranteeing filtration reliability.

[0008] In one example, the filter chamber, pressure relief chamber, and fan chamber of the vacuum cleaner are arranged sequentially in a straight line.

[0009] In one example, the vacuum cleaner head and body are arranged sequentially in the vertical direction, with the straight line direction perpendicular to the vertical direction.

[0010] The head and body are arranged vertically, perpendicular to a straight line, allowing the dust collection chamber to have a certain size along this direction. The dust collection chamber relies on gravity to collect dust and debris, and therefore needs sufficient size along the direction of gravity (generally vertically). Arranging the filter chamber, pressure relief chamber, and fan chamber sequentially in a straight line not only facilitates easy communication between them but also ensures the vacuum cleaner has a smaller size along the direction of gravity.

[0011] In one example, the vacuum cleaner's pressure relief chamber is further provided with a first connecting port and a second connecting port. The first connecting port is located at the bottom of the pressure relief chamber and is connected to the fan chamber. The second connecting port is located on the side of the pressure relief chamber in a straight direction near the filter chamber and is connected to the filter chamber. The pressure relief port is located at the top of the pressure relief chamber.

[0012] The pressure relief port is located at the top of the pressure relief chamber, thus connecting the chamber to the outside gas at its top. The first connecting port is located at the bottom of the pressure relief chamber to connect the fan chamber and the pressure relief chamber. The second connecting port is located on the side of the pressure relief chamber closer to the filter chamber along a straight line to connect the pressure relief chamber and the filter chamber. The pressure relief port, the first connecting port, and the second connecting port are positioned at different locations in the vertical direction. This prevents unwanted turbulence from forming in the pressure relief chamber during pressure relief. The second connecting port is positioned on the side closer to the filter chamber in a straight line so that the flow direction of the outside gas flowing from the pressure relief chamber into the filter chamber is different from the flow direction of the outside gas flowing from the pressure relief chamber into the fan chamber. This also helps to prevent unwanted turbulence.

[0013] In one example, the vacuum cleaner housing includes an upper cover that forms the top wall of the filter chamber and the pressure relief chamber. The upper cover is provided with an air supply valve seat and a pressure relief valve seat. The air supply valve is movably supported by the air supply valve seat, and the pressure relief valve is movably supported by the pressure relief valve seat. The air supply port is located on the air supply valve seat, and the pressure relief port is located on the pressure relief valve seat.

[0014] The air supply valve is movably supported by the air supply valve seat, and the pressure relief valve is movably supported by the pressure relief valve seat. Both the air supply valve seat and the pressure relief valve seat are located on the upper cover. This simplifies the vacuum cleaner structure, facilitates installation, and reduces the size of the vacuum cleaner.

[0015] In one example, the vacuum cleaner's air replenishment valve includes a first guide rod and two first valve plates, the two first valve plates being fixed to the first guide rod and spaced apart from each other, and the air replenishment valve seat having two opposing air replenishment ports. The first guide rod is driven to move longitudinally thereto, causing the two first valve plates to selectively open or close the two air replenishment ports.

[0016] In one example, the pressure relief valve includes a second guide rod and two second valve plates, the two second valve plates being fixed to the second guide rod and spaced apart from each other, and the pressure relief valve seat having two opposing pressure relief ports. The second guide rod is driven to move longitudinally thereon so that the two second valve plates selectively open or close the two pressure relief ports.

[0017] This design allows for greater pressure relief efficiency in the vacuum cleaner. Furthermore, the placement of the first and second guide rods allows the pressure relief port and air supply port to be opened or closed independently. This also improves the vacuum cleaner's reliability.

[0018] In one example, the vacuum cleaner housing also includes a lower cover, which is located below the upper cover and together with the upper cover forms the filter chamber and the pressure relief chamber.

[0019] In one example, the vacuum cleaner housing also includes a tray located below the lower cover and enclosing the fan cavity within the lower cover.

[0020] In one example, the vacuum cleaner head also includes a first drive unit and a second drive unit. The first drive unit is used to drive the air supply valve to switch between an open air supply port position and a closed air supply port position, and the second drive unit is used to drive the pressure relief valve to switch between an open pressure relief port position and a closed pressure relief port position. Attached Figure Description

[0021] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0022] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0023] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0024] Figure 1 This is a schematic diagram of the structure of the vacuum cleaner of this utility model.

[0025] Figure 2 for Figure 1 The diagram shows the airflow path of a vacuum cleaner. For ease of explanation, some components have been omitted.

[0026] Figure 3 for Figure 1 A schematic diagram of the internal structure of a vacuum cleaner.

[0027] Figure 4 for Figure 1 The diagram shows the internal structure of the engine head. For ease of explanation, some components have been omitted.

[0028] Figure 5 for Figure 4 The diagram shows the exploded structure of the engine head; some parts have been omitted for clarity.

[0029] Figure 6 for Figure 4 A schematic diagram of the structure of the top cover.

[0030] Figure 7A For along Figure 3 A cross-sectional view of a vacuum cleaner observed along section AA, with the pressure relief valve in the closed position.

[0031] Figure 7B For along Figure 3 A cross-sectional view of a vacuum cleaner observed along section AA, showing the pressure relief valve in the open position.

[0032] Figure 8A For along Figure 3 A cross-sectional view of a vacuum cleaner observed along the BB section line, showing the air supply valve in the closed position.

[0033] Figure 8B For along Figure 3 A cross-sectional view of a vacuum cleaner observed along the BB section line, showing the air supply valve in the open position. Detailed Implementation

[0034] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0035] refer to Figures 1 to 4 This utility model provides a vacuum cleaner 1. The vacuum cleaner 1 is configured to use the negative pressure generated by the high-speed rotation of the fan 13 to suck away small objects from the suction port for cleaning; the fluid formed by this negative pressure is called the suction gas. The vacuum cleaner 1 can be a canister vacuum cleaner as shown in the figure, or it can be other types of vacuum cleaners. For ease of explanation, potentially applicable components such as the handheld part and the suction head are omitted in the figures.

[0036] Vacuum cleaner 1 may include a head 10 and a body 20, which are arranged sequentially in a vertical direction Z. By way of example only, the head 10 may be detachable from the body 20, thereby allowing the dust collection chamber 30 formed by the head 10 and the body 20 to communicate with the external environment. The dust collection chamber 30 is configured to store most of the dust and debris carried in the inhaled air. In one possible embodiment, gravity may be used to allow the dust and debris carried with the inhaled air to fall into the dust collection chamber 30.

[0037] By way of example only, the drum body 20 can be configured as a barrel-shaped container with sufficient dimensions in the vertical direction Z to allow the dust collection chamber 30 to have ample space to receive dust and debris during continuous operation. Casters can also be provided on the bottom side of the drum body 20 to allow the vacuum cleaner 1 to move and clean.

[0038] The vacuum cleaner head 10 may include a housing 11, a filter 12, a fan 13, a make-up air valve 14, and a pressure relief valve 15. The housing 11 houses multiple components that perform the functions of the vacuum cleaner 1. The housing 11 is also configured to form interconnected airflow paths. The fan 13 is disposed within the airflow path. When the fan 13 rotates, the average air pressure in the airflow path is lower than atmospheric pressure. The airflow path also communicates with a dust collection chamber 30 to create a negative pressure environment within the dust collection chamber 30. This negative pressure environment powers the intake air.

[0039] For reference only, in the form of examples Figure 2The airflow path includes a filter chamber 120, a pressure relief chamber 150, and a fan chamber 130. In the direction of the intake gas flow, the dust collection chamber 30 is located upstream of the filter chamber 120, the filter chamber 120 is upstream of the pressure relief chamber 150, and the pressure relief chamber 150 is upstream of the fan chamber 130. A fan 13 is disposed in the fan chamber 130. A filter 12 is disposed in the filter chamber 120 and configured to filter the intake gas passing through the dust collection chamber 30. Smaller dust particles and debris are thus trapped at the filter 12. The head unit 10 also includes an air inlet 141, which is disposed on the side of the filter chamber 120 opposite to the dust collection chamber 30. This air inlet 141 is configured to replenish fluid (hereinafter referred to as replenishing fluid) into the airflow path when the vacuum cleaner 1 finishes cleaning to balance the pressure difference inside and outside the vacuum cleaner 1. An air inlet 141 located in the filter chamber 120 allows the air supply fluid to flow from the air inlet 141 through the filter 12 into the dust collection chamber 30, thereby blowing away small dust and debris accumulated on the filter 12 into the dust collection chamber 30, achieving the self-cleaning function of the filter 12. Preferably, the filter chamber 120, the pressure relief chamber 150, and the fan chamber 130 are arranged sequentially along a straight line X.

[0040] It should be noted that the term "cavity" in this utility model refers to a space that allows fluid to enter and exit and carries a specific component. The component carried in the cavity will be affected by the fluid flow or configured to regulate the fluid flow. Unless otherwise expressly stated, this utility model does not limit the specific shape and size of each cavity.

[0041] The air supply valve 14 is configured to selectively open or close the air supply port 141. By way of example only, the air supply valve 14 may be a solenoid valve, a diaphragm solenoid valve, and / or a manual switch. Preferably, see reference... Figure 5 and Figure 6 An air supply valve seat 16 is provided on the top wall of the filter chamber 120. An air supply port 141 serves as a support for the air supply valve seat 16. The air supply valve 14 is supported on the air supply valve seat 16 and moves relative to the air supply valve seat 16 to open or close the air supply port 141. Preferably, two opposing air supply ports 141 are provided on the top wall of the filter chamber 120.

[0042] At this time, the air supply valve 14 includes a first guide rod 14a and two first valve plates 14b. The two first valve plates 14b are fixed to the first guide rod 14a and spaced apart from each other. The first guide rod 14a is driven to move longitudinally along the first guide rod 14a so that the two first valve plates 14b selectively open or close the two air supply ports 141. In one possible embodiment, a sealing component is provided at either of the two first valve plates 14b to improve the wear of the air supply valve 14 and ensure the sealing performance of the air supply valve 14.

[0043] Since the air inlet 141 and the air supply valve 14 are located on the top side of the filter chamber 120, when the air supply valve 14 is opened, a large amount of air supply fluid will flow into the filter chamber 120, which is adjacent to and connected to the dust collection chamber 30 with a negative pressure environment, in a short period of time. This will cause the air supply fluid to impact the filter 12 at a relatively high flow rate. Currently, commonly used filters 12 are mainly in the form of filter elements, filter paper, and filter screens. Filters 12 installed in the filter chamber 120 in the form of filter paper and filter screens are at risk of being impacted by the air supply fluid, causing them to shift in position or even be damaged.

[0044] In view of this, a pressure relief port 151 is also provided in the head unit 10. The pressure relief port 151 is located in the pressure relief chamber 150. Preferably, the pressure relief port 151 is located on the top side of the pressure relief chamber 150, and is configured to introduce replenishing fluid into the airflow path simultaneously with or before the replenishing air port 141 when the vacuum cleaner 1 finishes cleaning. The pressure relief port 151 can reduce the flow rate of the replenishing fluid passing through the filter 12, thereby improving the service life of the filter 12 and reducing the risk of filter 12 displacement or even damage while allowing the filter 12 to self-clean.

[0045] Preferably, refer to Figures 1 to 6 A pressure relief valve seat 17 is provided on the top wall of the pressure relief chamber 150. A pressure relief port 151 serves as a support for the pressure relief valve seat 17. The pressure relief valve 15 is supported on the pressure relief valve seat 17 and moves relative to the pressure relief valve seat 17 to open or close the pressure relief port 151. Preferably, the top wall of the pressure relief chamber 150 includes two opposing pressure relief ports 151.

[0046] At this point, the pressure relief valve 15 includes a second guide rod 15a and two second valve plates 15b. The two second valve plates 15b are fixed to the second guide rod 15a and spaced apart from each other. The second guide rod 15a is driven to move longitudinally along the second guide rod 15a so that the two second valve plates 15b selectively open or close the two pressure relief ports 151. In one possible embodiment, a sealing member is provided at either of the two second valve plates 15b to improve the wear of the pressure relief valve 15 and ensure the sealing performance of the pressure relief valve 15.

[0047] In one possible implementation, the housing 11 includes an upper cover 11a and a lower cover 11b. The upper cover 11a and lower cover 11b are arranged sequentially along the vertical direction Z, and together enclose a filter chamber 120 and a pressure relief chamber 150. Preferably, the upper cover 11a forms the top wall of the filter chamber 120 and the pressure relief chamber 150, and both the air supply valve seat 16 and the pressure relief valve seat 17 are disposed on the upper cover 11a. The air supply port 141 and the pressure relief port 151, thus configured, are both located on the upper cover 11a, and the upper cover 11a, in conjunction with the lower cover 11b, forms the filter chamber 120 with a self-cleaning function and the pressure relief chamber 150 with a pressure relief function. This not only simplifies the mechanism of the vacuum cleaner 1 but also reduces the precision requirements of each component, thereby reducing production costs.

[0048] In one possible implementation, the housing 11 further includes a tray 11c. The tray 11c is disposed below the lower cover 11b to form a fan cavity 130 together with the lower cover. Preferably, the pressure relief cavity 150 includes a first communication port 152 connecting the pressure relief cavity 150 to the fan cavity 130 and a second communication port 153 connecting the pressure relief cavity 150 to the filter cavity 120. The first communication port 152 is located at the junction of the lower cover 11b and the tray 11c, and the second communication port 153 is located at the junction of the upper cover 11a and the lower cover 11b, and is located on the side of the pressure relief cavity closer to the filter cavity 120 along the linear direction X. Since the upper cover 11a, the lower cover 11b, and the tray 11c are three separate components, airflow paths with different fluid properties can be obtained through the shape of any of the upper cover 11a, the lower cover 11b, and the tray 11c.

[0049] Meanwhile, due to the vertical positional relationship of the upper cover 11a, lower cover 11b, and tray 11c, the pressure relief port 151 is located at the top of the pressure relief chamber 150 and higher than the second connecting port 153, while the first connecting port 152 is located at the bottom of the pressure relief chamber 150 and lower than the second connecting port 153. This airflow path arrangement avoids the formation of unwanted turbulence in the pressure relief chamber 150 during pressure relief. The second connecting port 153 is positioned on the side closer to the filter chamber 120 in the straight direction X, so that the flow direction of the makeup air flowing from the pressure relief chamber 150 into the filter chamber 120 is different from the flow direction of the makeup air flowing from the pressure relief chamber 150 into the fan chamber 130. This also avoids the formation of unwanted turbulence.

[0050] refer to Figures 7A to 8B The advantages of the air inlet 141, pressure relief port 151, air inlet valve 14, pressure relief valve 15, and related components of this utility model will be explained below in conjunction with the working process of the vacuum cleaner 1. It should be noted that other functions of the vacuum cleaner 1 can also be implemented in this process, as long as the vacuum cleaner 1 can perform the cleaning function, pressure relief function, and air inlet function of the vacuum cleaner 1 according to the same or similar principles.

[0051] When the vacuum cleaner 1 performs cleaning, the fan 13 operates, causing the pressure in the airflow path to be lower than atmospheric pressure, and simultaneously creating a negative pressure environment in the dust collection chamber 30. When the cleaning work ends, the fan 13 stops operating. Due to factors such as the shape of the airflow path and the reduced pressure in the working environment, the vacuum cleaner 1 cannot automatically compensate for the negative pressure environment. Therefore, a valve opening command needs to be applied to the vacuum cleaner 1 to balance the pressure difference inside and outside the vacuum cleaner 1, while also expecting the vacuum cleaner 1 to perform self-cleaning of the filter 12. For example, a button (not shown) may be provided on the head 10. When the user presses the button, the control device of the vacuum cleaner 1 receives the valve opening command. The first drive device 18a of the vacuum cleaner 1 drives the air supply valve 14 from the closed position of the air supply port 141 to the open position, and the second drive device 18b of the vacuum cleaner 1 simultaneously drives the pressure relief valve 15 from the closed position of the pressure relief port 151 to the open position. The replenishing fluid enters the airflow path simultaneously from the air supply port 141 and the pressure relief port 151. Since the pressure relief port 151 is closer to the fan chamber 130 than the air supply port 141, the gas supplied through the pressure relief port 151 will be preferentially drawn away by the fan 13. On the one hand, less gas supplied through the air supply port 141 will be drawn away by the fan 13, thus allowing the gas supplied through the air supply port 141 to act more on the filter 12 for cleaning the filter 12. On the other hand, it can quickly balance the internal and external pressures of the pressure relief chamber 150 and the filter chamber 120, which reduces the flow velocity of the air supply fluid flowing through the filter 12 compared to the flow velocity when only one air supply valve 14 is installed, reducing the impact of the air supply fluid on the filter 12.

[0052] Subsequently, the user can press another button, causing the control device of the vacuum cleaner 1 to receive a valve closing command. The first drive device 18a drives the air supply valve 14 from the open air supply port 141 position to the closed air supply port 141 position, and the second drive device 18b simultaneously drives the pressure relief valve 15 from the open pressure relief port 151 position to the closed pressure relief port 151 position. When continuing to perform cleaning work, the airflow path of the vacuum cleaner 1 can still be lower than atmospheric pressure, and a negative pressure environment can still be formed in the dust collection chamber 30.

[0053] The first drive device 18a can be a power mechanism movable longitudinally along the air supply valve seat 16. By way of example only, the first drive device 18a can be an electromagnet. The second drive device 18b can be a power mechanism movable longitudinally along the pressure relief valve seat 17. By way of example only, the second drive device 18b can be an electromagnet.

[0054] In another possible implementation, the first drive unit 18a of the vacuum cleaner 1 can first drive the air supply valve 14 from the closed position to the open position of the air supply port 141. After a period of time, the second drive unit 18b drives the pressure relief valve 15 from the closed position to the open position of the pressure relief port 151. At this time, the air supply fluid first enters the airflow path from the pressure relief port 151, and then reduces the negative pressure in the pressure relief chamber 150 and the filter chamber 120 respectively through the first connecting port 152 and the second connecting port 153. Then the air supply port 141 is opened. At this time, the negative pressure in the filter chamber 120 has been compensated, the pressure difference between the inside and outside of the filter chamber 120 is small, and the impact of the air supply fluid on the filter chamber 120 is small. This allows the vacuum cleaner 1 to complete the self-cleaning of the filter 12 without damaging the filter 12, and at the same time, it can also compensate for the negative pressure environment in the dust collection chamber 30, balancing the pressure inside and outside the vacuum cleaner 1.

[0055] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0056] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0057] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements, these elements are not defined by these terms, which are only used to distinguish one element from another.

[0058] The basic principles of this utility model have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this utility model are merely examples and not limitations, and should not be considered as essential features of each embodiment of this utility model. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the utility model from being implemented using the aforementioned specific details.

[0059] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A vacuum cleaner, the vacuum cleaner comprising: Bucket body; The dust collection chamber is formed by the dust collector head and the barrel body. The dust collector head includes: The housing contains a filter chamber and a fan chamber, and the filter chamber has an air inlet that communicates with the outside. A filter, located within the filter chamber; A fan is located inside the fan chamber. When the fan is running, it pushes airflow from the dust collection chamber through the filter chamber to the fan chamber to create negative pressure in the dust collection chamber. An air supply valve is used to selectively open or close the air supply port. When the air supply port is open, under the negative pressure in the dust collection chamber, the outside airflow flows from the air supply port through the filter to the dust collection chamber. Its features are: The head unit also includes a pressure relief valve, and the housing is further provided with a pressure relief chamber. The pressure relief chamber has a pressure relief port that communicates with the outside. The pressure relief valve is used to selectively open or close the pressure relief port. The pressure relief chamber is located between the filter chamber and the fan chamber, and is connected to the airflow path from the filter chamber to the fan chamber.

2. The dustsucker according to claim 1, characterized in that, The filter chamber, the pressure relief chamber, and the fan chamber are arranged sequentially along a straight line.

3. The vacuum cleaner according to claim 2, characterized in that, The machine head and the barrel body are arranged sequentially in the vertical direction, and the straight line direction is perpendicular to the vertical direction.

4. The vacuum cleaner according to claim 3, characterized in that, The pressure relief chamber is further provided with a first connecting port and a second connecting port. The first connecting port is located at the bottom of the pressure relief chamber and communicates with the fan chamber. The second connecting port is located on the side of the pressure relief chamber near the filter chamber in the straight direction and communicates with the filter chamber. The pressure relief port is located at the top of the pressure relief chamber.

5. The vacuum cleaner according to claim 3, characterized in that, The housing includes an upper cover, which forms the top wall of the filter chamber and the pressure relief chamber. The upper cover is provided with an air supply valve seat and a pressure relief valve seat. The air supply valve is movably supported by the air supply valve seat, and the pressure relief valve is movably supported by the pressure relief valve seat. The air supply port is located on the air supply valve seat, and the pressure relief port is located on the pressure relief valve seat.

6. The vacuum cleaner according to claim 5, characterized in that, The air supply valve includes a first guide rod and two first valve plates. The two first valve plates are fixed to the first guide rod and spaced apart from each other. The air supply valve seat has two opposing air supply ports. The first guide rod is driven to move longitudinally to selectively open or close the two air supply ports.

7. The dust cup according to claim 5, wherein The pressure relief valve includes a second guide rod and two second valve plates. The two second valve plates are fixed to the second guide rod and spaced apart from each other. The pressure relief valve seat has two opposing pressure relief ports. The second guide rod is driven to move longitudinally to selectively open or close the two pressure relief ports.

8. The vacuum cleaner according to claim 5, characterized in that, The housing also includes a lower cover, which is located below the upper cover and together with the upper cover forms the filter chamber and the pressure relief chamber.

9. The dustsucker according to claim 8, characterized in that The housing also includes a tray, which is located below the lower cover and forms the fan cavity with the lower cover.

10. The dust cup according to claim 1, wherein The machine head also includes a first driving device and a second driving device. The first driving device is used to drive the air supply valve to switch between the position of opening the air supply port and the position of closing the air supply port. The second driving device is used to drive the pressure relief valve to switch between the position of opening the pressure relief port and the position of closing the pressure relief port.

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