Air purifiers and their control methods and devices

Abstract

This invention provides an air purifier and its control method and device. The air purifier includes a filter assembly disposed within an air duct. The filter assembly includes at least one filter unit, and each filter unit includes a rotating member and multiple filter screens disposed on the rotating member. The multiple filter screens are distributed along the rotation direction of the rotating member. The rotating member can switch different filter screens to a filtering position or cut out the filter screen in the filtering position by rotation. The filter screen in the filtering position blocks the airflow section of the air duct. Based on the technical solution of this invention, the filter structure is set as a rotatable structure, thereby allowing the corresponding filter screen to be switched to a working position or cut out based on rotation. This allows for flexible adjustment of the filter screens according to actual conditions to achieve corresponding filtration and ventilation requirements.

Description

Technical Field

[0001] This invention relates to the field of air purifier technology, and particularly to an air purifier and its control method and control device. Background Technology

[0002] As environmental pollution worsens and people become more health-conscious, more and more people are considering purchasing air purifiers. Air purifiers are gradually entering homes and becoming an indispensable household appliance.

[0003] However, the design of current air purifiers in terms of function adjustment is still imperfect. Specifically, different pollutants in the air require different filtration and purification methods, that is, different types of filters are needed. For example, filtering particulate matter and filtering volatile organic compounds require different filters, but current air purifiers can either only filter one type or filter both at the same time, and the filtration function cannot be flexibly switched. While filtering multiple pollutants at the same time is certainly more effective, it requires the use of multi-layer composite filters, which greatly increases air resistance, resulting in insufficient airflow and high filtration noise.

[0004] Therefore, it can be seen that the current air purifier's filtration structure and functions are difficult to switch flexibly for different actual situations, resulting in a poor user experience. Summary of the Invention

[0005] To address the problem that existing air purifiers cannot flexibly switch filtration functions according to actual filtration needs due to the inability to adjust the filtration structure, this invention proposes an air purifier and its control method and device.

[0006] In a first aspect, the present invention provides an air purifier, comprising a filter assembly disposed in an air duct, the filter assembly comprising at least one filter unit, the filter unit comprising a rotating member and a plurality of filter screens disposed on the rotating member, the plurality of filter screens being distributed along the rotation direction of the rotating member;

[0007] The rotating component can switch different filters to filtering positions or cut out the filters in the filtering positions by rotating, and the filters in the filtering positions block the air passage section of the air duct.

[0008] In one embodiment, a plurality of the filter units are arranged side by side in the air duct, and the plurality of filter screens of the plurality of filter units at the filtering positions can form a continuously extending windbreak surface, the projection of the windbreak surface on the plane where the air passage section is located completely covers the air passage section.

[0009] In one embodiment, the rotating component is a rotating shaft, the filter screen is a planar structure extending radially along the rotating shaft, the multiple rotating shafts in the multiple filter units divide the air passage section into multiple air passages, the location of the air passage is the filter position, and the size of the filter screen matches the area of ​​the air passage.

[0010] In one embodiment, the rotating shaft is provided with two filters orthogonal to each other, and the rotating shaft can switch the two filters to the filtering position by rotating 90 degrees in the forward and reverse directions.

[0011] In one embodiment, the rotating component is a rotating cylinder capable of rotating about its own axis. The cylinder has a plurality of vents distributed along the rotation direction. At least a portion of the vents are covered with the filter screen. At least one end of the rotating cylinder has an opening that corresponds to the air outlet of the air duct.

[0012] In one embodiment, the air duct is provided with a plurality of baffles arranged at intervals, the baffles dividing the air passage section into a plurality of air passage openings, the position of the rotating cylinder corresponds to the air passage opening, and the outer peripheral surface of the rotating cylinder is in sealed contact with the opening edges on both sides of the air passage opening, the location of the air passage opening is the filter position, and the width of the air passage opening is smaller than the diameter of the rotating cylinder.

[0013] In one embodiment, the plurality of filters in the filtration unit include a particulate filter for filtering particulate matter and an adsorption filter for filtering volatile organic compounds.

[0014] Secondly, the present invention provides a control method for an air purifier, comprising:

[0015] Real-time acquisition of air quality parameters in the target scene;

[0016] The operating mode of the air purifier is determined based on the value of the air quality parameters.

[0017] According to the operating mode, the filter assembly installed in the air duct of the air purifier is rotated, and the corresponding filter screen in the filter assembly is switched to or cut out to the position corresponding to the air passage section of the air duct.

[0018] In one implementation, determining the operating mode of the air purifier based on the numerical value of the air quality parameter includes:

[0019] Based on the relationship between the particulate matter concentration and volatile organic compound concentration in the air quality parameters and their corresponding thresholds, the operating mode of the air purifier is determined to be particulate matter filtration mode, adsorption filtration mode, alternating filtration mode, or non-filtration mode.

[0020] In one embodiment, according to the operating mode, the filter assembly disposed in the air duct of the air purifier is rotated to switch or cut out the corresponding filter screen to a position corresponding to the airflow section of the air duct, including:

[0021] In particulate filtration mode, switch the particulate filter to the position corresponding to the airflow section of the duct;

[0022] In adsorption filtration mode, switch the adsorption filter to the position corresponding to the air passage section of the air duct;

[0023] In alternating filtration mode, the particulate filter and the adsorption filter are switched alternately at a preset switching frequency to the corresponding position of the air passage section of the air duct.

[0024] In non-filtration mode, cut the particulate filter or adsorption filter to a position corresponding to the airflow section of the duct.

[0025] In one implementation, it further includes:

[0026] In the non-filtering mode, it is determined whether a target object exists within the target scene;

[0027] If a target object is present, the air purifier is kept running, and the particulate filter or adsorption filter is cut out to a position corresponding to the air passage section of the air duct, so that the air duct is directly open.

[0028] If no target object is found, the air purifier will be put into standby mode.

[0029] Thirdly, the present invention provides a control device for an air purifier, comprising:

[0030] The parameter acquisition module is used to acquire air quality parameters of the target scene in real time.

[0031] An operation mode determination module is used to determine the operation mode of the air purifier based on the value of the air quality parameters; and

[0032] The filter switching module is used to rotate the filter assembly installed in the air duct of the air purifier according to the operating mode, and switch the corresponding filter screen in the filter assembly to or cut out a position corresponding to the air passage section of the air duct.

[0033] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0034] The air purifier and its control method and device provided by the present invention have at least the following advantages compared with the prior art:

[0035] The present invention discloses an air purifier and its control method and control device, wherein the filter structure is configured to be rotatable, thereby allowing the corresponding filter to be switched to the working position or the filter in the working position to be cut out based on rotation, so as to flexibly adjust the filter according to the actual situation to achieve the corresponding filtration and ventilation requirements. Attached Figure Description

[0036] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0037] Figure 1 This shows an overall external structural diagram of the air purifier of the present invention;

[0038] Figure 2 A schematic diagram of the internal filter structure of the air purifier of the present invention is shown;

[0039] Figure 3 A schematic diagram showing one structure of the filter assembly of the air purifier of the present invention is provided.

[0040] Figure 4 Shows Figure 3 A schematic diagram of one of the operating states of the filter assembly shown;

[0041] Figure 5 Shows Figure 3 A schematic diagram of another operating state of the filter component shown;

[0042] Figure 6 Shows Figure 3 A schematic diagram of another operating state of the filter component shown;

[0043] Figure 7 A schematic diagram showing another structure of the filter assembly of the air purifier of the present invention is shown;

[0044] Figure 8 Shows Figure 7 A schematic diagram of another layout of the filter components shown;

[0045] Figure 9 The main flowchart of the control method for the air purifier of the present invention is shown.

[0046] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0047] Figure label:

[0048] 1-Filter assembly, 10-Filter unit, 11-Rotating component, 111-Ventilation opening, 112-Opening, 12-Filter screen, 2-Air duct, 21-Air outlet, 22-Air outlet, 3-Baffle. Detailed Implementation

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] Example 1

[0051] An embodiment of the present invention provides an air purifier, including a filter assembly 1 disposed in an air duct 2. The filter assembly 1 includes at least one filter unit 10. The filter unit 10 includes a rotating member 11 and a plurality of filter screens 12 disposed on the rotating member 11. The plurality of filter screens 12 are distributed along the rotation direction of the rotating member 11.

[0052] The rotating component 11 can switch different filters 12 to the filtering position or cut out the filter 12 in the filtering position by rotating. The filter 12 in the filtering position blocks the air passage section of the air duct 2.

[0053] The rotating component 11 is a rotating shaft, and the filter screen 12 is a planar structure extending radially along the rotating shaft. The multiple rotating shafts in the multiple filter units 10 divide the air passage section into multiple air passages 21. The location of the air passage 21 is the filtration position, and the size of the filter screen 12 matches the area of ​​the air passage 21.

[0054] Specifically, this embodiment mainly describes one of the selectable structures of the filter component 1, as shown in the attached figure. Figure 3 The structure shown is illustrated in the attached diagram. The diagram shows the external appearance of the air purifier of the present invention and its internal filter structure. Figure 1 and Figure 2 As shown in the attached figure Figure 3 The core inventive point of this invention is shown: the structure of the flexibly switchable filter assembly 1. The filter assembly 1 is disposed in the air duct 2, and essentially uses a filter screen 12 to block the airflow section of the air duct 2, thus forcing the airflow in the air duct 2 to pass through the filter screen 12. In this embodiment, the filter unit 10 in the filter assembly 1 uses a rotating shaft as a rotating component 11. The filter screen 12 is disposed on the rotating shaft and extends radially. Therefore, the position of the corresponding filter screen 12 can be switched by rotating the shaft. The corresponding filter screen 12 can be rotated to the filtering position or the filter screen 12 in the filtering position can be cut out by rotation (i.e., rotated away from the filtering position). Refer to the accompanying drawings. Figure 4 and Figure 5 This allows for the adjustment of the filtration structure. Furthermore, due to the structure of the filter assembly 1 in this embodiment, multiple filter screens 12 are spaced apart circumferentially along the rotating shaft. Therefore, the filter screens 12 can be rotated and cut out filtration positions via the rotating shaft. Thus, when there is no filter screen at the filtration position, the air duct 2 is effectively directly open, as shown in the attached diagram. Figure 6As shown, this allows for simple ventilation without the need for filtration or with only slight filtration, while also reducing the noise of the air purifier and minimizing the wear and tear on the filter 12.

[0055] The number of filter units 10 in filter assembly 1 can be adjusted according to actual conditions, mainly taking into account the internal space of the air purifier and the width of the air duct 2. If the internal space of the air purifier is sufficient and the width of the air duct 2 is small, only one filter unit 10 (with a large turning radius) can be set. In this case, the size of the filter screen 12 needs to match the area of ​​the air passage cross-section of the air duct 2. If the internal space of the air purifier is limited and the width of the air duct 2 is large, it can be arranged as shown in the attached diagram. Figure 3 Similarly, multiple filter units 10 (with a small turning radius) are arranged side by side within the air duct 2. The multiple filter screens 12 of the multiple filter units 10 at their filtering positions can form a continuously extending windbreak surface. The projection of the windbreak surface onto the plane of the air passage section completely covers the air passage section, as shown in the attached figure. Figure 4 As shown, at this time, the size of the filter screen 12 only needs to match the area of ​​the air vent 21 between the two adjacent rotating shafts.

[0056] Furthermore, the arrangement of the multiple filter units 10 can be as shown in the attached figure. Figures 3 to 6 The linear arrangement shown, combined with the planar filter screen 12, forms a planar windbreak surface (filter surface). This planar windbreak surface can be perpendicular to the airflow direction as shown in the attached diagram, or it can be inclined relative to the airflow direction. An inclined windbreak surface has a larger area, meaning the actual filter surface formed by the filter screen 12 is larger, thus improving the filtration effect. Based on the linear arrangement of multiple filter units 10, the filter screen 12 can also adopt a curved structure, forming a curved windbreak surface (filter surface), further increasing the filtration area. The multiple filter units 10 can also be arranged along a curve, using planar or curved filter screens 12 to form a curved windbreak surface, which also increases the contact area with the airflow and improves the filtration effect.

[0057] Of course, the number and type of filter screens 12 on a filter unit 10 in this invention can be selected according to specific needs. For example, to solve the problems described in the background art of this invention, it is necessary to switch the filter screens 12 for different pollutants. Therefore, the multiple filter screens 12 of the filter unit 10 should include a particulate filter for filtering particulate matter and an adsorption filter for filtering volatile organic compounds. Naturally, the number of filter screens 12 should also be at least two, and the corresponding filter screens 12 can be switched by rotation according to specific needs. Of course, if it is necessary to filter multiple substances simultaneously, it is preferable to switch continuously at a certain frequency so that the corresponding type of filter screen 12 alternately enters the filtration position for filtration.

[0058] It should be noted that, in this embodiment, the airflow flows from upstream to downstream of the filter assembly 1, so the airflow will inevitably come into contact with all the filter screens 12, even as shown in the accompanying drawings. Figure 6 As shown in the conductive state, the filter of this invention always provides a certain degree of air filtration, but this filtration does not affect the normal operation of the air purifier in various operating states, and it is always able to filter the air. (See attached diagram for example.) Figure 6 In the open state shown, although the filter 12 can come into contact with the airflow, the filter 12 will not obstruct the airflow too much because the air outlet 21 is open. The airflow can still maintain smooth flow under a certain filtration effect.

[0059] Meanwhile, the multiple filters 12 in the filter unit 10 can also be selected from the same type of filters 12, and the specifications of the filters 12 can be the same or different. When multiple filters 12 have the same specifications (e.g., mesh count), the technical effect achieved by switching filters 12 is to avoid problems such as clogging caused by prolonged use of a single filter 12, which would affect the filtration effect. Rotation allows for easy switching of filters 12, alternating their use and extending the lifespan of a single filter 12. When multiple filters 12 have different specifications (e.g., mesh count), the technical effect achieved by switching filters 12 is that different specifications of filters 12 have different filtration effects for the same pollutant. Therefore, filters 12 with appropriate effects can be selected according to the degree of air pollution; for example, a higher concentration of particulate matter requires switching to a denser mesh filter 12.

[0060] Preferably, refer to the accompanying drawings. Figures 4 to 6 The rotating shaft is equipped with two filters 12, which are orthogonal to each other. The rotating shaft can switch the two filters 12 to the filtering position by rotating 90 degrees in the forward and reverse directions.

[0061] Specifically, the two filters 12 can achieve the functions of switching and adjusting the filtration mode. While enabling functional switching, the two filters 12 also have the simplest structure, require minimal space, and can be configured with filters of different types and specifications as needed. Setting the two filters 12 orthogonally to each other facilitates layout design and, more importantly, minimizes the obstruction of airflow by the filter 12 not in the filtration position; see attached diagram for details. Figure 4 and Figure 5 The filter screen 12 in the filtering position is perpendicular to the airflow direction, while the filter screen 12 not in the filtering position is parallel to the airflow direction. Therefore, the filter screen 12 parallel to the airflow direction will not affect the airflow.

[0062] Furthermore, since the rotation drive of the filter assembly 1 is not a major improvement of this invention, it can be implemented with reference to existing technologies. For example, the rotating component 11 in the filter assembly 1 can be driven by a motor, and multiple rotating components 11 can be connected as one unit by a belt or gear, driven by a single motor power source. Of course, multiple motors can also be used for individual driving. Since the rotating component 11 only rotates a certain angle and can be switched between forward and reverse rotation, a linkage structure can also be used for driving, similar to the linkage structure of an adjustable air guide vane in an air conditioner, converting linear motion into rotation.

[0063] Example 2

[0064] This embodiment mainly proposes a different filter component structure based on Embodiment 1, which can also achieve filter switching. Some of the same content is the same as in Embodiment 1, and will not be repeated in this embodiment.

[0065] An embodiment of the present invention provides an air purifier, including a filter assembly 1 disposed in an air duct 2. The filter assembly 1 includes at least one filter unit 10. The filter unit 10 includes a rotating member 11 and a plurality of filter screens 12 disposed on the rotating member 11. The plurality of filter screens 12 are distributed along the rotation direction of the rotating member 11.

[0066] The rotating component 11 can switch different filters 12 to the filtering position or cut out the filter 12 in the filtering position by rotating. The filter 12 in the filtering position blocks the air passage section of the air duct 2.

[0067] The rotating component 11 is a rotating cylinder capable of rotating around its own axis. The cylinder has multiple ventilation openings 111 distributed along the rotation direction. At least some of the ventilation openings 111 are covered with filter screens 12. At least one end of the rotating cylinder has an opening 112, which corresponds to the air outlet 22 of the air duct 2.

[0068] It should be noted that in this embodiment, the design is such that at least some of the vents 111 are covered with filters 12. This includes two cases: a) all vents 111 are equipped with filters 12; b) some vents 111 (based on the concept of filter switching, "some" here means at least two) are equipped with filters 12, and some vents 111 are not equipped with filters 12 (for the direct conduction of the air duct 2, "some" here means at least one).

[0069] Specifically, this embodiment mainly proposes a filter component 1 with another structure, as shown in the attached figure. Figure 7 As shown, in this embodiment, the rotating component 11 of the filter unit 10 is a rotating cylinder. The rotating cylinder has a cylindrical structure with ventilation openings 111 on its body. One end of the rotating cylinder has an opening 112 corresponding to the air outlet 22 of the air duct 2. Airflow enters the interior of the rotating cylinder through the ventilation opening 111 and flows along the internal channel of the rotating cylinder to the opening 112 at the end before being discharged. In this embodiment, similar to Embodiment 1, by rotating the rotating cylinder, the corresponding ventilation opening 111 can be positioned in the filtration position. Different ventilation openings 111 are covered with corresponding filter screens 12 or not covered with filter screens 12, thus allowing switching between filtration modes or switching to direct ventilation mode. In this embodiment, the essential difference in structural design from that of embodiment 1 is that the internal space of the rotating cylinder of the filter unit 10 is used as part of the air duct 2. The airflow enters the interior of the rotating cylinder through the vent 111, and then enters the final air outlet 22 of the air duct 2 through the opening 112 at the end of the rotating cylinder before being discharged. In contrast, the filter unit 10 in embodiment 1 is merely a component inside the air duct 2 and does not participate in the structural construction of the air duct 2. The airflow in the air duct 2 continues to flow along the air duct 2 after passing through the filter unit 10.

[0070] The purpose of the structural design in this embodiment is mainly to further improve a defect in embodiment 1, namely, the structure of the filter component 1 in embodiment 1, while being able to normally achieve the switching of the filter screen 12 and the filter mode, will pass through the process shown in the attached figure at the moment and during the filter screen switching. Figure 3 The state shown indicates that the corresponding air vent 21 will be fully open for a period of time. This results in some air being output without strict filtration. Although the switching time is short and the amount of this air is small, the problem persists. The root cause of this problem is that the multiple filters 12 on the rotating shaft are not in a continuous plane, leading to air leakage during switching. Therefore, in this embodiment, the rotating component 11 is set as a cylindrical structure, and the corresponding filters 12 are set on the cylinder. In fact, multiple filters 12 are in a continuous plane. As long as the multiple filters 12 are arranged continuously adjacent to each other (i.e., the fully open vent 111 without filters 12 is located between the beginning and end of the annular area where filters 12 are distributed, refer to the attached figure), the problem is solved. Figure 7 This allows for seamless switching when changing the filter 12 in both forward and reverse directions, avoiding air leakage issues.

[0071] Of course, in principle any shape of rotating drum can achieve this technical effect, but considering that adjacent filter units 10 need to be sealed during rotation, the rotating drum is preferably a cylindrical drum.

[0072] Furthermore, considering the sealing issue between the rotating drums, in addition to selecting cylindrical shapes, adjacent filter units 10 should maintain a sealed contact with each other. Therefore, please refer to the attached diagram. Figure 7 As shown, multiple rotating cylinders are arranged in a row, with adjacent cylinders in contact with each other. Structurally, the central angle corresponding to the arc of the windward surface of a single rotating cylinder is 180°. The cylinder body is essentially divided into two. Based on the overall concept of filter switching, one half of the cylinder can be equipped with one filter 12, and the other half can be equipped with another filter 12. Consequently, there is no additional space to set up a direct ventilation opening 111. In this case, the filter unit 10 does not have the characteristics shown in the attached figure of Embodiment 1. Figure 5 The direct ventilation duct 2 shown is the same as the aforementioned case a.

[0073] If, without any other sealing structure, the seal relies solely on the contact between the rotating cylinders, and a direct-flow ventilation opening 111 is desired for the outflow space—meaning at least three ventilation openings 111 are required: two for installing and switching filters 12, and the remaining one for direct flow—then the arrangement of the rotating cylinders can be further designed. Multiple rotating cylinders can be arranged along a curve, preferably along an arc, with the concave side of the arc serving as the windward side, as shown in the attached diagram. Figure 8 As shown. In this way, the windward area of ​​a single rotating cylinder is less than half of its cylinder area, that is, the central angle corresponding to the arc of the arc surface on the cylinder that serves as the windward side is less than 180°. Therefore, more areas can be divided on the cylinder, that is, at least three areas can be divided, with two vents 111 covering the filter screen 12 and one direct vent 111, which is the aforementioned case b.

[0074] Furthermore, this design of curved rotating cylinders not only solves the sealing problem without the need for additional sealing components, but also, based on the further design of this embodiment, multiple filter units 10 are arranged side by side in the air duct 2, and the multiple filter screens 12 of the multiple filter units 10 at the filtration position can form a continuously extending windbreak surface. The projection of the windbreak surface on the plane where the wind passage section is located completely covers the wind passage section. The windward surfaces of the multiple rotating cylinders constitute a windbreak surface that is curved as a whole. Compared with the windbreak surface that is flat as a whole formed by the rotating cylinders arranged in a straight line, the effective filtration area is larger under the same conditions.

[0075] Furthermore, in a structure where multiple rotating cylinders can be arranged in one way, the aforementioned case b can also be achieved. In this case, additional sealing components need to be provided, namely: multiple baffles 3 are arranged at intervals in the air duct 2. The baffles 3 divide the air passage section into multiple air passages 21. The position of the rotating cylinder corresponds to the air passage 21, and the outer circumference of the rotating cylinder is in sealed contact with the edges of the air passages 21 on both sides. The location of the air passage 21 is the filtration position, and the width of the air passage 21 is smaller than the diameter of the rotating cylinder.

[0076] Specifically, as shown in the attached diagram. Figure 7 As shown, the main function of the sealing component is to reduce the area of ​​the windward side of the rotating cylinder. This can be achieved by reducing the width of the corresponding air passage 21. Therefore, multiple baffles 3 are arranged at intervals in the air duct 2, and air passages 21 are formed between the baffles 3. The rotating cylinder is set with air passages 21 in a one-to-one correspondence. By controlling the size of the baffles 3, the width of the air passage 21 is made smaller than the diameter of the rotating cylinder. As a result, the area of ​​the windward side of the rotating cylinder corresponding to the air passage 21 will be less than half the area of ​​the rotating cylinder body. Thus, the baffles 3 are used as sealing components to achieve the aforementioned situation b in the structural layout of multiple rotating cylinders arranged in a line.

[0077] Furthermore, in the rotating drum structure, since there are multiple vents 111 on the drum body, the airflow, after entering the interior of the rotating drum through the filter screen 12 located in the filtration position, may in principle continue to flow out of the rotating drum through other vents 111, as shown in the figure. Figure 7 As shown, the airflow, after entering the rotating cylinder from below, could theoretically continue to flow upwards. However, considering the entire flow process... Figure 7 The upper part of the air duct 2 is closed, and without an outlet, a continuous airflow cannot be formed. Therefore, the airflow can only flow along the inside of the rotating cylinder to the open end 112, and finally enter the air outlet 22 of the air duct 2. Of course, in order to further stabilize the airflow direction, a one-way flow structure corresponding to the vent 111 can be set on the inner wall of the rotating cylinder. For example, multiple baffles can be set on the inner wall of the rotating cylinder, and the baffles can be partially fixed to the inner wall of the rotating cylinder. The external airflow can blow the baffles inward and enter the rotating cylinder. When the airflow wants to flow out through other vents 111, the baffles at the corresponding positions will be forced to stick to the inner wall of the rotating cylinder, thereby covering the corresponding vent 111, which can ensure that the airflow cannot flow out radially after entering the rotating cylinder radially.

[0078] Furthermore, based on the aforementioned principle that after the airflow enters the rotating drum through the filter screen 12 located in the filtration position, it is also possible for the airflow to continue flowing out of the rotating drum through other vents 111, a back-flushing cleaning technology can be designed for the particulate filter screen. That is, the airflow can continue to flow out of the rotating drum through the particulate filter screen of other vents 111. In this process, it is actually a backflushing of the corresponding filter screen 12. Further cleaning can be carried out at the corresponding position in the air duct 2 (e.g., Figure 7A backflush outlet is installed above the central air duct 2 to clean the filter 12 by backflushing. The opening and closing of the backflush outlet is controlled; it remains closed during normal filtration to avoid affecting the airflow direction during normal air purification. (See attached diagram.) Figure 7 The structure of the transfer cylinder and the baffle in sealed contact Figure 8 The contact structure of the rotating drums allows for relative movement between their outer surfaces in the circumferential direction during rotation. This enables them to scrape away dust and other foreign objects that may be adsorbed or accumulated on the surface of the filter screen 12, thus achieving another way of cleaning the filter screen 12, namely, automatic cleaning of the filter screen 12.

[0079] Example 3

[0080] Refer to the attached diagram. Figure 9 This embodiment proposes a control method for an air purifier, including:

[0081] Step S100: Acquire air quality parameters in the target scene in real time;

[0082] Step S200: Determine the operating mode of the air purifier based on the value of the air quality parameters;

[0083] Step S210: Based on the relationship between the particulate matter concentration and volatile organic compound concentration in the air quality parameters and their corresponding thresholds, determine the operating mode of the air purifier as particulate matter filtration mode, adsorption filtration mode, alternating filtration mode, or non-filtration mode.

[0084] Specifically, as shown in the attached diagram. Figure 9 As shown, in this embodiment, the air quality parameters are the concentrations of PM2.5 and formaldehyde. PM2.5 refers to particulate matter, and formaldehyde refers to volatile organic compounds. These parameters can also be set to other parameters depending on actual needs. The corresponding filters are set as particulate matter filters for PM2.5 and adsorption filters for formaldehyde.

[0085] Based on the relationship between PM2.5 and formaldehyde concentrations and their corresponding thresholds, four scenarios can be derived through permutations and combinations: high PM2.5 concentration and low formaldehyde concentration, which is particulate matter filtration mode; low PM2.5 concentration and high formaldehyde concentration, which is adsorption filtration mode; high PM2.5 concentration and high formaldehyde concentration, which is alternating filtration mode (both require filtration); and low PM2.5 concentration and low formaldehyde concentration, which is non-filtration mode.

[0086] Step S300: According to the operating mode, rotate the filter assembly installed in the air duct of the air purifier, and switch or cut out the corresponding filter screen in the filter assembly to the position corresponding to the air passage section of the air duct.

[0087] Step S310: In particulate matter filtration mode, switch the particulate matter filter to the position corresponding to the airflow section of the air duct;

[0088] Step S320: In adsorption filtration mode, switch the adsorption filter to the position corresponding to the air passage section of the air duct;

[0089] Step S330: In alternating filtration mode, the particulate filter and the adsorption filter are switched alternately at a preset switching frequency to the corresponding positions of the air passage section of the air duct.

[0090] Step S340: In non-filtration mode, cut the particulate filter or adsorption filter to a position corresponding to the air passage section of the air duct;

[0091] Step S341: In non-filtering mode, determine whether the target object exists in the target scene;

[0092] Step S342: If a target object exists, keep the air purifier running and cut the particulate filter or adsorption filter to a position corresponding to the air passage section of the air duct, so that the air duct is directly open.

[0093] Step S343: If the target object does not exist, put the air purifier into standby mode.

[0094] Specifically, based on the corresponding filtration mode, the appropriate type of filter is switched to the filtration position. In non-filtration mode, it further determines whether there is a target object (such as a user) in the target scene, thereby determining whether ventilation is needed. If a target object is present, the air duct is directly opened and the air purifier is turned on to ventilate and circulate the air within the target scene; if no target object is present, it indicates that the target scene does not require filtration or air circulation, and the system enters standby mode. Determining whether ventilation is needed based on the target object reduces unnecessary operating time of the air purifier, saving energy.

[0095] The above control processes are all performed dynamically, and the corresponding control processes are implemented as the relevant air parameters of the target scene change.

[0096] Example 4

[0097] This embodiment proposes a control device for an air purifier, including:

[0098] The parameter acquisition module is used to acquire air quality parameters of the target scene in real time.

[0099] The operating mode determination module is used to determine the operating mode of the air purifier based on the numerical values ​​of air quality parameters; and

[0100] The filter switching module is used to rotate the filter components installed in the air duct of the air purifier according to the operating mode, and switch the corresponding filter screen in the filter components to or cut out the position corresponding to the air passage section of the air duct.

[0101] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0102] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An air purifier, characterized in that, The system includes a filter assembly disposed within an air duct. The filter assembly includes at least one filter unit, which includes a rotating member and a plurality of filter screens disposed on the rotating member. The plurality of filter screens are distributed along the rotation direction of the rotating member. The plurality of filter screens in the filter unit include a particulate filter for filtering particulate matter and an adsorption filter for filtering volatile organic compounds. The rotating component can switch different filters to filtering positions or cut out the filters in the filtering positions by rotating, and the filters in the filtering positions block the air passage section of the air duct. The rotating component is a rotating shaft, and the filter screen is a planar structure extending radially along the rotating shaft. The multiple rotating shafts in the multiple filter units divide the air passage section into multiple air passages. The location of the air passage is the filter position, and the size of the filter screen matches the area of ​​the air passage. The rotating shaft is provided with two filter screens, which are orthogonal to each other. The rotating shaft can switch the two filter screens to the filtering position by rotating 90 degrees in the forward and reverse directions. Multiple filter units are arranged side by side in the air duct, and the multiple filter screens of the multiple filter units at the filtration positions can form a continuously extending windbreak surface. The projection of the windbreak surface on the plane where the air passage section is located completely covers the air passage section.

2. The air purifier according to claim 1, characterized in that, The rotating component is a rotating cylinder capable of rotating around its own axis. The cylinder has multiple ventilation openings distributed along the rotation direction. At least some of the ventilation openings are covered with the filter screen. At least one end of the rotating cylinder has an opening that corresponds to the air outlet of the air duct.

3. The air purifier according to claim 2, characterized in that, The air duct is provided with multiple baffles arranged at intervals, which divide the air passage section into multiple air passages. The position of the rotating cylinder corresponds to the air passage, and the outer circumference of the rotating cylinder is in sealed contact with the edges of the air passages on both sides. The location of the air passage is the filter position, and the width of the air passage is smaller than the diameter of the rotating cylinder.

4. A control method for an air purifier as described in any one of claims 1 to 3, characterized in that, include: Real-time acquisition of air quality parameters in the target scene; The operating mode of the air purifier is determined based on the value of the air quality parameters. According to the operating mode, the filter assembly installed in the air duct of the air purifier is rotated, and the corresponding filter screen in the filter assembly is switched to or cut out to the position corresponding to the air passage section of the air duct.

5. The control method for an air purifier according to claim 4, characterized in that, The operating mode of the air purifier is determined based on the value of the air quality parameters, including: Based on the relationship between the particulate matter concentration and volatile organic compound concentration in the air quality parameters and their corresponding thresholds, the operating mode of the air purifier is determined to be particulate matter filtration mode, adsorption filtration mode, alternating filtration mode, or non-filtration mode.

6. The control method for an air purifier according to claim 4, characterized in that, According to the operating mode, the filter assembly installed in the air purifier's duct rotates, switching or cutting the corresponding filter to a position corresponding to the airflow section of the duct, including: In particulate filtration mode, switch the particulate filter to the position corresponding to the airflow section of the duct; In adsorption filtration mode, switch the adsorption filter to the position corresponding to the air passage section of the air duct; In alternating filtration mode, the particulate filter and the adsorption filter are switched alternately at a preset switching frequency to the corresponding position of the air passage section of the air duct. In non-filtration mode, cut the particulate filter or adsorption filter to a position corresponding to the airflow section of the duct.

7. The control method for an air purifier according to claim 5 or 6, characterized in that, Also includes: In the non-filtering mode, it is determined whether a target object exists within the target scene; If a target object is present, the air purifier is kept running, and the particulate filter or adsorption filter is cut out to a position corresponding to the air passage section of the air duct, so that the air duct is directly open. If no target object is found, the air purifier will be put into standby mode.

8. A control device for use in an air purifier as described in any one of claims 1 to 3, characterized in that, include: The parameter acquisition module is used to acquire air quality parameters of the target scene in real time. The operating mode determination module is used to determine the operating mode of the air purifier based on the value of the air quality parameters. as well as The filter switching module is used to rotate the filter assembly installed in the air duct of the air purifier according to the operating mode, and switch the corresponding filter screen in the filter assembly to or cut out a position corresponding to the air passage section of the air duct.

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