Filter screen accumulated dust detection device, filter screen accumulated dust detection method and household appliance

Abstract

The embodiment of the invention provides a filter screen accumulated dust detection device, a filter screen accumulated dust detection method and a household appliance, the filter screen accumulated dust detection device comprises a control module, a light emitting module and a receiving module, the light emitting module and the receiving module are oppositely arranged and at least located on at least two sides of a filter screen, and the control module is connected with the light emitting module and the receiving module; the filter screen is polygonal; the light-emitting module comprises a light-emitting unit, and the light-emitting unit comprises a plurality of light-emitting devices with different colors; the receiving module comprises color sensors, and the color sensors are in one-to-one correspondence with the light-emitting units; the color sensor is used for receiving light signals emitted by the light-emitting device; the control module is used for determining the dust accumulation level of the dust accumulation on the filter screen according to the light signals collected by the color sensor, so that the dust accumulation level of the dust accumulation on the filter screen can be determined according to the light with different colors emitted by the light emitting devices with different colors, the dust accumulation process is detected according to the thickness level, and the accuracy of the dust accumulation detection on the filter screen is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air purification, in particular to a filter screen dust detection device, a filter screen dust detection method device and a household appliance. BACKGROUND

[0002] At present, most devices use filter screens to purify air, but as the devices are used for a long time, the phenomenon of dust accumulation on the filter screen is getting more and more serious, and the dust on the filter screen needs to be detected to clean and replace the filter screen in time.

[0003] At present, only by setting a transmitting tube and a receiving tube can it be determined whether the filter screen has deposition, but when there is a large amount of accumulation, the receiving tube is blocked by the accumulation first, and the actual accumulation is not full, which causes false positives. Therefore, how to accurately identify the thickness of the dust is a problem that needs to be solved at present. SUMMARY

[0004] Some embodiments of the present application aim to provide a filter screen dust detection device, a filter screen dust detection method and a household appliance. Through the technical solutions of the embodiments of the present application, the device comprises a control module, a light-emitting module and a receiving module, the light-emitting module and the receiving module are oppositely arranged and located at least on both sides of the filter screen, and the control module is connected with the light-emitting module and the receiving module respectively; the filter screen is a polygon; the light-emitting module comprises a light-emitting unit, the light-emitting unit comprises a plurality of light-emitting devices with different colors; the receiving module comprises a color sensor, the color sensor corresponds to the light-emitting unit one by one; the color sensor is used to receive the light signals emitted by the light-emitting devices; and the control module is used to determine the dust level of the filter screen dust according to the light signals collected by the color sensor. In the embodiments of the present application, the light-emitting module and the receiving module are arranged on at least opposite sides of the filter screen, the light-emitting module comprises a light-emitting unit, the light-emitting unit comprises a plurality of light-emitting devices with different colors, the plurality of light-emitting devices with different colors are used to represent different thickness levels of the dust, the receiving module comprises a color sensor, the color sensor corresponds to the light-emitting unit one by one, in the detection process, the control module receives the light signals collected by the receiving module, and determines the dust level of the filter screen dust according to the light signals. In this way, the different colors of light emitted by the light-emitting devices with different colors can be used to determine the dust level of the filter screen dust, the detection of the dust thickness level in the dust accumulation process is realized, and the accuracy of the filter screen dust detection is improved.

[0005] In a first aspect, some embodiments of the present application provide a filter screen dust detection device, the device comprising: a control module, a light-emitting module, and a receiving module, the light-emitting module and the receiving module being oppositely arranged and located on at least two sides of the filter screen, and the control module being connected to the light-emitting module and the receiving module respectively; the filter screen being a polygon; The light-emitting module comprises a light-emitting unit, the light-emitting unit comprising a plurality of light-emitting devices of different colors; the receiving module comprises a color sensor, the color sensor corresponding to the light-emitting unit one by one; and the color sensor is used to receive light signals emitted by the light-emitting devices. The control module is used to determine a dust accumulation level of the filter screen according to the light signals collected by the color sensor.

[0006] Optionally, the receiving module further comprises a first circuit board, and the light-emitting module further comprises a second circuit board; the first circuit board and the second circuit board are both arranged perpendicularly to the plane of the filter screen, the light-emitting unit is located on the second circuit board and arranged close to one side of the filter screen, the color sensor is located on the first circuit board and arranged away from one side of the filter screen; and the distance from the color sensor to the plane of the filter screen is greater than or equal to the distance from the light-emitting device farthest from the filter screen to the plane of the filter screen. Optionally, the number of the light-emitting modules and the receiving modules is the same, and both comprise a plurality of light-emitting modules and receiving modules; the plurality of light-emitting modules are uniformly distributed along the direction parallel to the plane of the filter screen on the second circuit board; and the plurality of receiving modules are uniformly distributed along the direction parallel to the plane of the filter screen on the first circuit board.

[0007] Some embodiments of the present application arrange the light-emitting module close to one side of the filter screen, arrange the receiving module close to one side of the air inlet grille, and arrange the color sensor at a distance from the plane of the filter screen greater than or equal to the distance from the light-emitting device close to the air inlet grille to the plane of the filter screen; and by arranging a plurality of light-emitting modules and a plurality of receiving modules, the filter screen can be detected in a partitioned manner, ensuring that the color sensor body is not submerged when the dust accumulation in a certain area of the filter screen is full, and avoiding false positives.

[0008] Optionally, in the direction perpendicular to the plane of the filter screen, the plurality of light-emitting devices of different colors are uniformly arranged. In some embodiments of the present application, the average value is calculated according to the maximum deposition thickness of the filter screen, the interval distance between two light-emitting devices is determined according to the average value, and in the direction perpendicular to the plane of the filter screen, the light-emitting devices are uniformly arranged according to the interval distance between the filter screen and the air inlet grille; in this way, each light-emitting device corresponds to a dust accumulation thickness level, the logic is intuitive, and different thicknesses of dust are subdivided to improve the accuracy of the hierarchical level.

[0009] Optionally, the light shielding member is further included, and the light shielding member is located at a side of the light emitting module and the receiving module away from the filter screen, and the light shielding member is used for shielding light for the light emitting module and the receiving module.

[0010] Some embodiments of the present application are further provided with a light shielding member, which shields light for the light emitting device to avoid shining light outside the air inlet grille, and shields light for the receiving module to avoid external light shining on the color sensor, thereby improving detection accuracy. Optionally, the light shielding member is integrally arranged with the light emitting module and the receiving module, respectively.

[0011] In some embodiments of the present application, the light shielding member can be arranged in connection with the air inlet grille, or arranged in connection with the light emitting module and the receiving module, respectively, or arranged in connection with the filter screen. Different mounting methods can be used to mount the light shielding member according to different structures of the equipment.

[0012] Optionally, the light emitting module and the receiving module are integrally arranged.

[0013] In some embodiments of the present application, the light emitting module and the receiving module are integrally arranged, so that the light emitting module and the receiving module can be directly mounted on the filter screen, or mounted on the air inlet grille, or mounted on the equipment shell. Screws or buckles can be used for convenient installation and maintenance.

[0014] In a second aspect, some embodiments of the present application provide a filter screen dust accumulation detection method, applied to the filter screen dust accumulation detection device of the first aspect, and the method comprises the following steps: sending a light emitting instruction to the light emitting module, so that the light emitting device in the light emitting module emits a target light signal, and the receiving module receives the target light signal; acquiring the target light signal received by the receiving module; determining a target dust accumulation level of the filter screen dust accumulation corresponding to the target light signal according to pre-set dust accumulation level matching information, wherein the pre-set dust accumulation level matching information comprises a preset light signal and a dust accumulation level corresponding to the preset light signal.

[0015] Optionally, the step of determining the target dust accumulation level of the filter screen dust accumulation corresponding to the target light signal according to the pre-set dust accumulation level matching information comprises: matching the target light signal with the preset light signal; if the target light signal matches the preset light signal, determining the dust accumulation level corresponding to the preset light signal as the target dust accumulation level.

[0016] Some embodiments of the present application acquire the target optical signal in real time by using the control module, and match the target optical signal with the pre-stored dust accumulation level matching information, to determine the target dust accumulation level corresponding to the target optical signal.

[0017] In a third aspect, some embodiments of the present application provide a household appliance, comprising a filter screen, wherein the filter screen is provided with the filter screen dust accumulation detection device according to the first aspect.

[0018] Optionally, the household appliance is an air purifier or an air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of some embodiments of the present application, the following will briefly introduce the drawings needed to be used in some embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 A structural schematic diagram of a filter screen dust accumulation detection device provided by an embodiment of the present application; Figure 2 A structural schematic diagram of another filter screen dust accumulation detection device provided by an embodiment of the present application; Figure 3 A structural schematic diagram of a light-emitting module provided by an embodiment of the present application; Figure 4 A dust accumulation level diagram provided by an embodiment of the present application; Figure 5 A structural schematic diagram of still another filter screen dust accumulation detection device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solutions of some embodiments of the present application will be described below in conjunction with the drawings in some embodiments of the present application.

[0022] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Meanwhile, in the description of the present application, the terms “first”, “second”, etc. are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0023] Most of the current equipment uses filter screen to purify air, but with the long-term operation of the equipment, the dust accumulation on the filter screen is more and more serious, and the dust accumulation on the filter screen needs to be detected to clean and replace the filter screen in time. At present, a plurality of pairs of infrared LED emitting tubes and receiving tubes can be arranged in four directions or two opposite directions of the filter screen respectively, the emitting tubes and the receiving tubes are oppositely arranged, and the control module considers that the dust in which area is full by detecting which pair of light paths is blocked, and considers that it is full when all the light paths are blocked, prompting the user to replace or clean. By using the above detection method, first, a single infrared LED emitting tube and a receiving tube are used, which can only reflect two states of full or not full, and second, because the height of the emitting tube and the receiving tube to the plane where the filter screen is located is the same, when the accumulated material is more, the receiving tube is blocked by the accumulated material first, and the actual accumulated material is not full, which causes false reporting. Therefore, how to distinguish the dust accumulation at different stages and accurately detect the state of the dust accumulation is a problem that needs to be solved at present. In view of this, some embodiments of the present application provide a filter screen dust accumulation detection device, which comprises: a control module, a light emitting module and a receiving module, the light emitting module and the receiving module are oppositely arranged and located at least on at least two sides of the filter screen, and the control module is connected with the light emitting module and the receiving module respectively; the filter screen is a polygon; the light emitting module comprises a light emitting unit, the light emitting unit comprises a plurality of light emitting devices with different colors; the receiving module comprises a color sensor, and the color sensor corresponds to the light emitting unit one by one; the color sensor is used for receiving the light signal emitted by the light emitting device; the control module is used for determining the dust accumulation level of the filter screen according to the light signal collected by the color sensor. In the embodiments of the present application, the light emitting module and the receiving module are arranged on at least two opposite sides of the filter screen respectively, and the light emitting module comprises a light emitting unit, and the light emitting unit comprises a plurality of light emitting devices with different colors. The plurality of light emitting devices with different colors are used to represent different thickness levels of the dust accumulation. The receiving module comprises a color sensor, and the color sensor corresponds to the light emitting unit one by one. In the detection process, the control module receives the light signal collected by the receiving module, and determines the dust accumulation level of the filter screen according to the light signal. In this way, the dust accumulation level of the filter screen can be determined according to the different colors of the light emitted by the light emitting devices with different colors, the thickness level detection of the dust accumulation process is realized, and the accuracy of the filter screen dust accumulation detection is improved.

[0024] As Figure 1 shown, the embodiments of the present application provide a filter screen dust accumulation detection device, which comprises: a control module 101, a light emitting module 102 and a receiving module 103, the light emitting module 102 and the receiving module 103 are oppositely arranged and located at least on at least two sides of the filter screen, and the control module 101 is connected with the light emitting module 102 and the receiving module 103 respectively; the filter screen is a polygon; The light-emitting module 102 comprises a light-emitting unit comprising a plurality of light-emitting devices of different colors; the receiving module 103 comprises a color sensor corresponding to the light-emitting unit; the color sensor is used to receive the light signal emitted by the light-emitting device. The light-emitting device can be a light-emitting diode (LED) and can be a direct insertion type or a patch type.

[0025] The control module 101 is used to determine the dust level of the filter screen according to the light signal collected by the color sensor.

[0026] In the present application, the filter screen can be a polygonal plate filter screen, such as a hexagonal plate filter screen, a rectangular plate filter screen or a square plate filter screen, corresponding to different sides of the plate filter element.

[0027] For example, if the plate filter screen is hexagonal, the light-emitting module and the receiving module can be arranged on a pair of opposite sides, or the light-emitting module and the receiving module can be arranged on two pairs of opposite sides. If the light-emitting module and the receiving module are arranged on two pairs of opposite sides of the hexagonal plate filter screen, that is, the light-emitting module and the receiving module need to be arranged on at least four sides of the hexagonal plate filter screen, and the light-emitting module and the receiving module are arranged opposite to each other, that is, at least two light-emitting modules and two receiving modules are needed, and the light-emitting module and the receiving module correspond to each other.

[0028] In combination Figure 2 As shown in the figure, the light-emitting module, that is, the second circuit board, is arranged on one side of the filter screen, and the receiving module, that is, the first circuit board, is arranged on the corresponding side, and the first circuit board and the second circuit board are connected to the control module and the power supply, respectively. The light-emitting module has one or more light-emitting units, and each light-emitting unit comprises a plurality of light-emitting devices of different colors, and the light-emitting device is used to emit light of different colors.

[0029] The color sensor in the receiving module corresponds to the light-emitting unit one by one, and the color sensor is used to receive the light signal emitted by the corresponding light-emitting device.

[0030] The control module is electrically connected to the color sensor and the LED array through a bus, and the LEDs are connected in parallel. The control module is used to control the light-emitting diode to emit light, receive the RGB data of the color sensor, and calculate the thickness and distribution of the dust on the filter screen by detecting the light intensity of different colors.

[0031] During the dust detection process on the filter, the control module controls the light-emitting device to emit light. If there is dust on the filter, the dust will block the propagation of the light signal, and the color sensor will not be able to receive the light signal. If there is no dust on the filter, the dust will not block the propagation of the light signal, and the color sensor will receive the light signal from the light-emitting device. Then, the control module compares the received light signal with the pre-stored light signal to determine the dust accumulation level. In other words, the degree of dust accumulation on the filter is comprehensively judged based on different thicknesses to obtain the dust accumulation level, i.e., different thickness levels.

[0032] For example, the light-emitting module contains multiple light-emitting devices of different colors, each with a certain thickness, which corresponds to a level. The light-emitting module has 4 light-emitting devices. If the first light-emitting device emits light, the corresponding color sensor fails to receive the light signal, indicating that the first light-emitting device is blocked by dust. The color sensor collects the light signals of the other three light-emitting devices. The light signal is RGB data. The control module obtains the RGB data from the color sensor and compares it with the preset RGB data to determine the dust accumulation level as level one.

[0033] This application provides a further explanation of the dust accumulation detection device for filters provided in the above embodiments.

[0034] Furthermore, the receiving module includes a first circuit board, and the light-emitting module includes a second circuit board; both the first circuit board and the second circuit board are arranged perpendicular to the filter plane, the light-emitting unit is located on the second circuit board and is arranged close to the filter, the color sensor is located on the first circuit board and is arranged away from the filter; and the distance from the color sensor to the plane where the filter is located is greater than or equal to the distance from the light-emitting device furthest from the filter among the plurality of light-emitting devices to the plane where the filter is located. Optionally, the number of light-emitting modules and the number of receiving modules are the same, and each includes multiple modules. The multiple light-emitting modules are evenly distributed along the second circuit board in a direction parallel to the plane where the filter is located; the multiple receiving modules are evenly distributed along the first circuit board in a direction parallel to the plane where the filter is located.

[0035] For example, such as Figure 2As shown, the receiving module includes a first circuit board, which can be configured as a long strip structure or other shapes. In this embodiment, no specific limitation is made. It can be set between the outside of the primary filter of a household appliance and the air inlet grille. The first circuit board can be a PCB (Printed Circuit Board). One or more color sensors are arranged vertically on the PCB to detect changes in light intensity in a specific wavelength band. The color sensors correspond to the light-emitting units on the second circuit board. Each light-emitting unit includes four colored LEDs. The distance from the color sensor to the plane where the filter is located is equal to or greater than the distance from the outermost LED in the same group to the plane where the filter is located, to ensure that the sensor is not submerged by dust when the filter is not full of dust. A light-shielding structure is provided to prevent external light sources from entering.

[0036] The light-emitting module in this embodiment includes a second circuit board, which can be a long strip structure or other structures. No specific limitation is made in this embodiment. The second circuit board is opposite to the first circuit board and is disposed outside the filter. One or more light-emitting units are disposed on the second circuit board. Each light-emitting unit includes a color LED array, i.e., multiple different light-emitting diodes. Each light-emitting unit contains 4 color LEDs (red, yellow, green, and blue), which correspond one-to-one with the color sensor in the first circuit board.

[0037] In some embodiments of this application, the light-emitting module is positioned near the filter, and the receiving module is positioned near the air inlet grille. The distance from the color sensor to the plane where the filter is located is greater than or equal to the distance from the light-emitting device near the air inlet grille to the plane where the filter is located. This ensures that the color sensor body is not submerged when the dust accumulation is full, thus avoiding false alarms.

[0038] Optionally, the plurality of light-emitting devices of different colors are uniformly arranged in a direction perpendicular to the plane of the filter.

[0039] like Figure 3 As shown, the longitudinal spacing of the light-emitting devices is calculated by averaging the maximum thickness of the filter when it is fully loaded with dust. In other words, the distance between adjacent light-emitting devices is: d = Hmax / 3; Where Hmax is the maximum dust accumulation thickness of the filter screen.

[0040] For example, after obtaining the distance between adjacent light-emitting diodes (LEDs), LEDs are installed between the filter and the air intake grille.

[0041] Since each LED corresponds to a thickness level, and the intensity of each color is further subdivided into thickness levels, the dust coverage level can be determined according to different colors. In the embodiments of this application, multiple light-emitting devices of different colors can be set in each light-emitting unit. The more light-emitting devices there are, the finer the deposition thickness grading can be divided, and the higher the detection accuracy of the deposition.

[0042] For example, if the thickness of the pre-filter is about 6mm, four LEDs can be set so that the thickness of a certain area can be displayed via an app or screen as 1 / 4, 2 / 4, or 3 / 4. Alternatively, six LEDs can be set so that the thickness of a certain area can be displayed via an app or screen as 1 / 6, 2 / 6, 3 / 6, 4 / 6, or 5 / 6.

[0043] Furthermore, n color sensors are set on the first circuit board, and n groups of 4-color LED arrays are also set on the second circuit board, where n is a natural number greater than or equal to 1. There is one or more light-emitting units on the second circuit board, and the light-emitting units correspond one-to-one with the color sensors.

[0044] In this embodiment, when n is greater than 1, the dust accumulation area of ​​the filter is horizontally divided into multiple independent areas, with each light-emitting unit corresponding to one area of ​​the filter. This allows for the identification of different areas, and the control module presents the dust and hair accumulation distribution across the entire filter surface to the user based on the degree of occlusion in each area. Specifically, if there is only one light-emitting unit, it corresponds to one color sensor (n=1). In this case, no division is needed, and the color sensor detects the entire filter area. If there are two light-emitting units, it corresponds to two color sensors, which requires horizontal division of the dust accumulation area. Each color sensor detects half of the horizontally divided area of ​​the filter. If there are three light-emitting units, it corresponds to three color sensors, and each color sensor detects one-third of the horizontally divided area of ​​the filter. And so on. The more light-emitting units and sensors there are, the more horizontally divided areas there are, enabling zoned monitoring of the dust accumulation distribution on the filter. Based on the collected multi-region, multi-level fine data, the gradual process of dust accumulation and regional differences can be accurately reflected.

[0045] For example, based on the number n of color sensors, n partitions of the filter are determined. The area of ​​each partition corresponds one-to-one with the light-emitting unit. Based on the four colors of light-emitting diodes in the light-emitting unit, four thickness levels can be set. That is, a single partition corresponds to four thickness levels. Each thickness level can also be divided into 10 light intensity levels, and each partition can be subdivided into 40 levels. Replacement and cleaning recommendations can be uniformly evaluated based on the distribution and thickness.

[0046] Some embodiments of this application calculate an average value based on the maximum deposition thickness of the filter screen, determine the spacing between two light-emitting devices based on the average value, and set the light-emitting devices according to the spacing between the filter screen and the air inlet grille. In this way, each light-emitting device corresponds to a dust accumulation thickness level, which is logically intuitive and subdivides dust accumulation of different thicknesses, improving the accuracy of the layering level.

[0047] It should be noted that in practical applications, the filter screen is usually placed vertically. Due to gravity, the dust accumulation thickness at the bottom of the filter screen is relatively larger than that at the top of the filter screen. That is, the dust accumulation thickness is not the same in different areas of the filter screen. Based on this, in another embodiment of the present invention, the filter screen is divided into sections, preferably according to the direction of gravity.

[0048] like Figure 5 As shown, this application embodiment provides a dust accumulation detection device for a filter screen, including: a light-emitting module with three light-emitting units arranged along the direction of gravity, including light-emitting unit 1, light-emitting unit 2 and light-emitting unit 3. Each light-emitting unit includes four light-emitting diodes, including a red light-emitting diode, a green light-emitting diode, a blue light-emitting diode and a yellow light-emitting diode. The red light-emitting diode is close to the filter screen, and the green light-emitting diode, blue light-emitting diode and yellow light-emitting diode are arranged sequentially away from the filter screen; the filter screen dust accumulation detection device includes a receiving module with three color sensors arranged along the direction of gravity, including color sensor 1, color sensor 2 and color sensor 3. Light-emitting unit 1 corresponds to color sensor 1 and performs dust accumulation detection on section 1 of the filter screen, light-emitting unit 2 corresponds to color sensor 2 and performs dust accumulation detection on section 2 of the filter screen, and light-emitting unit 3 corresponds to color sensor 3 and performs dust accumulation detection on section 3 of the filter screen, thereby realizing the section detection of the filter screen.

[0049] Furthermore, during the dust accumulation detection process, for partition 1, the filter is initially in a dust-free state, and all four light-emitting diodes in the light-emitting unit 1 emit light, and the corresponding color sensor 1 collects the light from the four light-emitting diodes. As dust accumulates on section 1 of the filter, the increased thickness of the dust will gradually block the light from the red LED, causing the intensity of the red light collected by color sensor 1 to weaken. Color sensor 1 transmits the collected red, yellow, green and blue light signals to the control module. The control module compares the collected light signals with the preset light signals to determine that the current dust accumulation has entered the first thickness level. As the dust accumulates and thickens, it completely blocks the red light emitted by the red LED and gradually blocks the light emitted by the yellow LED, causing the color sensor 1 to be unable to collect the red light and the intensity of the collected yellow light to decrease. The color sensor 1 transmits the collected yellow, green and blue light signals to the control module. The control module compares the collected light signals with the preset light signals to determine that the current dust accumulation has entered the second thickness level. As the dust accumulates, it completely blocks the red light emitted by the red LED and the yellow light emitted by the yellow LED, and gradually blocks the light from the green LED. As a result, the color sensor 1 cannot collect the red and yellow light, and the intensity of the collected green light is weakened. The color sensor 1 transmits the collected green and blue light signals to the control module. The control module compares the collected light signals with the preset light signals and determines that the current dust accumulation has entered the third thickness level. As the dust accumulates, it blocks the red light emitted by the red LED, the yellow light emitted by the yellow LED, and the green light emitted by the green LED, and gradually blocks the light emitted by the blue LED. As a result, the color sensor 1 is unable to collect red, yellow, and blue light, and the intensity of the collected blue light is reduced. The color sensor 1 transmits the collected blue light signal to the control module. The control module compares the collected light signal with the preset light signal and determines that the current dust accumulation has entered the fourth thickness level. As the dust accumulation thickens further, the light from all the LEDs is completely blocked, indicating that filter section 1 is full of dust. The same method is used to detect different levels of dust accumulation in other sections 2 and 3.

[0050] In practical applications, it's possible that when the bottom partition 3 detects that the filter is full of dust, the color sensors in partitions 2 and 1 can still detect light signals. This means that if only the bottom partition 3 is full, it doesn't necessarily mean the entire filter is full. Therefore, determining the filter to be full in this situation would result in the filters in partitions 1 and 2 not being fully utilized. Therefore, partitioning allows for more efficient filter utilization. However, if the absence of a signal in partition 1 is used as the final signal for a full filter, it could lead to excessive dust accumulation on the filter, affecting the airflow of household appliances. Therefore, preferably, the filter can be determined to be full only when partition 2 in the middle area detects that it is full; or the filter can be determined to be full when no green or yellow LED light is detected in partition 1 in the upper area, prompting the user to replace the filter promptly.

[0051] Optionally, it also includes a light-shielding component located on the side of the light-emitting module and the receiving module opposite to the filter screen, the light-shielding component being used to provide light-shielding treatment for the light-emitting module and the receiving module. In this embodiment of the application: a shielding component is added to the side of the first circuit board and the second circuit board near the air intake grille. The shielding component is added to the side of the color sensor to prevent light from shining on the color sensor and interfering with the received light, thereby improving the detection accuracy. The shielding component is added to the side of the second circuit board to prevent the light emitted by the light-emitting device from shining on the outside of the air intake grille, causing light leakage.

[0052] As another alternative implementation, in this embodiment of the application, the air intake grille can be partially left without openings, thus replacing the current shielding structure. Optionally, the light-shielding component is integrally disposed with the light-emitting module and the receiving module respectively.

[0053] In some embodiments of this application, the light-shielding component can be connected to the air inlet grille, or it can be connected to the light-emitting module and the receiving module respectively, or it can be connected to the filter screen. Different installation methods can be used to install the light-shielding component according to different structures of the equipment.

[0054] Optionally, the light-emitting module and the receiving module are integrated into one unit.

[0055] In some embodiments of this application, the light-emitting module and the receiving module are integrated. The light-emitting module and the receiving module can be connected and installed on the filter screen by screws or clips, or they can be installed on the air inlet grille, or on the equipment housing, using screws or clips for easy installation and maintenance.

[0056] It should be noted that each of the implementable methods in this embodiment can be implemented individually or in any combination without conflict. This application does not limit this.

[0057] Another embodiment of this application provides a method for detecting dust accumulation on a filter screen, used to execute the filter screen dust accumulation detection device provided in the above embodiments, including: Send a light-emitting command to the light-emitting module so that the light-emitting device in the light-emitting module emits the target light signal, and the receiving module receives the target light signal; Acquire the target optical signal received by the receiving module; Based on the pre-set dust accumulation level matching information, the target dust accumulation level of the filter dust corresponding to the target light signal is determined. The pre-set dust accumulation level matching information includes a preset light signal and the dust accumulation level corresponding to the preset light signal.

[0058] Specifically, the control module sends light-emitting commands to the light-emitting module. These commands are sent to different light-emitting units based on different times or regions. This allows for the sending of corresponding commands according to time and region requirements, thus saving energy, preventing LED aging, and avoiding light pollution at night.

[0059] For example, the control module controls the LED lights in the target area to turn on according to the partition areas of different filters, or turns on the LED lights in different areas according to time.

[0060] Specifically, during the dust detection process on the filter screen, the control module sends a light-emitting command to the light-emitting module to control the light-emitting device to emit light. As an optional implementation, the light-emitting command can control each color of the light-emitting device. For example, only the red light-emitting device can be controlled to emit light, or only the yellow light-emitting device can be controlled to emit light, or only the blue light-emitting device can be controlled to emit light, or only the green light-emitting device can be controlled to emit light. For the above four control methods, the light-emitting devices of different colors can be emitted sequentially, or only one color of light-emitting device can be selected to emit light according to the actual situation. No specific limitation is made in the embodiments of this application.

[0061] As another alternative implementation, the light-emitting command sent by the control module can control all light-emitting devices to emit light simultaneously.

[0062] When the LED is emitting light, if there is dust accumulation on the filter, the dust will block the propagation of the light signal, and the color sensor will not be able to receive the light signal. If there is no dust accumulation on the filter, the dust will not block the propagation of the light signal, and the color sensor will receive the light signal from the light-emitting device. Then, the control module matches the received light signal with pre-stored dust accumulation level matching information. The pre-set dust accumulation level matching information includes a preset light signal and the dust accumulation level corresponding to the preset light signal. In this way, the target dust accumulation level on the filter can be determined. Moreover, since the filter is pre-divided into different areas, different areas correspond to different color sensors, and different target dust accumulation levels in different areas can also be determined.

[0063] As an optional implementation of this application, determining the target dust accumulation level of the filter dust corresponding to the target optical signal based on pre-set dust accumulation level matching information includes: Match the target optical signal with the preset optical signal; If the target light signal matches the preset light signal, then the dust accumulation level corresponding to the preset light signal will be determined as the target dust accumulation level.

[0064] In this embodiment, the color sensor detects three primary colors, with at most one additional IR. Each primary color has a value ranging from 0 to 255. The energy of each of these three primary colors is used to determine whether it is the target color. In other words, it is only necessary to first collect the RGB data corresponding to these four LEDs as a basis, i.e., the preset light signal in the processing module. By combining the preset light signal with the dust accumulation level corresponding to the preset light signal, the aforementioned pre-set dust accumulation level matching information is constructed. Thus, in the subsequent dust accumulation judgment process, only the real-time light signal, i.e., the RGB data, needs to be acquired to determine the target dust accumulation level.

[0065] When the filter is free of dust, the red, yellow, green, and blue light emitted by each group of LEDs on the second circuit board is fully detected by the corresponding color sensor. As the dust accumulation increases, it gradually blocks the LED light, causing the intensity of the corresponding color light to weaken. The color sensor can detect the specific degree of obstruction of the light intensity of each LED, and the control module determines the dust accumulation status through the following logic: It monitors the dust distribution on the filter in different zones, providing detailed data at multiple levels and offering richer information on the gradual accumulation of dust and regional distribution analysis.

[0066] like Figure 4 As shown, the red LED light intensity decreases: dust accumulation enters the first thickness level, and the degree of shading is further subdivided according to the light intensity attenuation ratio (e.g., 0-100%). Yellow LED light intensity reduced: Dust accumulation enters the second thickness level, with further subdivision of obstruction degree; Green LED light intensity decreases: Dust accumulation enters the third thickness level, further subdividing the degree of obstruction; The intensity of blue LED light is reduced: Dust accumulation has entered the fourth thickness level, with further subdivision of the degree of obstruction; When all four colored LEDs are completely blocked (the light intensity drops to the minimum threshold, such as 0%), the filter is considered to be full of dust.

[0067] Simultaneously, the dust accumulation area is horizontally divided into multiple independent zones. The control module presents the dust and hair accumulation distribution across the entire filter surface to the user based on the degree of occlusion in each zone. Vertically, it is divided into four thickness levels, each of which can be further subdivided into dust accumulation states. The control module presents the dust and hair accumulation thickness on the filter surface to the user based on the received light intensity. The overall result can be presented in image form, such as... Figure 4 The display shows the data to the user, allowing them to decide whether to clean or replace the filter without disassembling it. This data is also used by the control module's algorithm to generate a backflow curve, comprehensively assessing whether replacement is necessary. A light-shielding structure prevents strong light from entering the user's home, ensuring detection accuracy.

[0068] As another optional implementation of this application, the control module sends a light-emitting command to all red light-emitting devices, so that the red light-emitting devices will emit red light. If the color sensor does not receive red light, it means that the dust accumulation corresponding to the thickness of the red light-emitting device in that area is full, and the dust accumulation level of that area of ​​the filter is determined to be level one. Then, a light-emitting command is sent to all yellow light-emitting devices, so that the yellow light-emitting devices will emit yellow light. If the color sensor does not receive yellow light, it means that the dust accumulation corresponding to the thickness of the yellow light-emitting device in that area is full, and the dust accumulation level of that area of ​​the filter is determined to be level two, and so on. In particular, each level can be further subdivided according to the RGB data of the color sensor.

[0069] Some embodiments of this application use a control module to acquire the target light signal in real time and match it with pre-stored dust accumulation level matching information to determine the target dust accumulation level corresponding to the target light signal.

[0070] Some embodiments of this application provide a household appliance, including a filter screen, on which a dust detection device as described above is installed.

[0071] Alternatively, the household appliance may be an air purifier or an air conditioner.

[0072] Regarding the apparatus in this embodiment, the specific manner in which each module performs its operations has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0073] It should be noted that each of the implementable methods in this embodiment can be implemented individually or in any combination without conflict. This application does not limit this.

[0074] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0075] The above are merely specific embodiments of this application, but the scope of protection of this application 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 application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A filter dust accumulation detection device, characterized in that, include: The system includes a control module, a light-emitting module, and a receiving module. The light-emitting module and the receiving module are arranged opposite to each other and are located at least on at least two sides of the filter. The control module is connected to both the light-emitting module and the receiving module. The filter is polygonal. The light-emitting module includes a light-emitting unit, which includes multiple light-emitting devices of different colors; the receiving module includes a color sensor, which corresponds one-to-one with the light-emitting unit; the color sensor is used to receive the light signal emitted by the light-emitting device. The control module is used to determine the dust accumulation level of the filter screen based on the light signal collected by the color sensor.

2. The filter dust accumulation detection device according to claim 1, characterized in that, The receiving module further includes a first circuit board, and the light-emitting module further includes a second circuit board; both the first circuit board and the second circuit board are arranged perpendicular to the filter plane, the light-emitting unit is located on the second circuit board and is arranged close to the filter, the color sensor is located on the first circuit board and is arranged away from the filter; and the distance from the color sensor to the plane where the filter is located is greater than or equal to the distance from the light-emitting device furthest from the filter among the plurality of light-emitting devices to the plane where the filter is located.

3. The filter dust accumulation detection device according to claim 2, characterized in that, The number of light-emitting modules and the number of receiving modules are the same, and each includes multiple modules. The multiple light-emitting modules are evenly distributed along the second circuit board in a direction parallel to the plane where the filter is located; the multiple receiving modules are evenly distributed along the first circuit board in a direction parallel to the plane where the filter is located.

4. The filter dust accumulation detection device according to claim 1, characterized in that, The plurality of light-emitting devices of different colors are uniformly arranged in a direction perpendicular to the plane of the filter.

5. The filter dust accumulation detection device according to claim 1, characterized in that, It also includes a light-shielding component, which is located on the side of the light-emitting module and the receiving module away from the filter screen, and is used to provide light-shielding treatment for the light-emitting module and the receiving module.

6. The filter dust accumulation detection device according to claim 5, characterized in that, The light-shielding component is integrally formed with the light-emitting module and the receiving module, respectively.

7. The filter dust accumulation detection device according to any one of claims 1-6, characterized in that, The light-emitting module and the receiving module are integrated into one unit.

8. A method for detecting dust accumulation on a filter screen, characterized in that, The method, applied to the filter dust accumulation detection device as described in any one of claims 1-7, comprises: A light-emitting command is sent to the light-emitting module to cause the light-emitting device in the light-emitting module to emit a target light signal, and the receiving module receives the target light signal; The target optical signal received by the receiving module is acquired. Based on the pre-set dust accumulation level matching information, the target dust accumulation level of the filter dust corresponding to the target light signal is determined. The pre-set dust accumulation level matching information includes a preset light signal and the dust accumulation level corresponding to the preset light signal.

9. The method according to claim 8, characterized in that, The step of determining the target dust accumulation level of the filter dust corresponding to the target light signal based on pre-set dust accumulation level matching information includes: The target optical signal and the preset optical signal are matched; If the target optical signal matches the preset optical signal, then the dust accumulation level corresponding to the preset optical signal is determined as the target dust accumulation level.

10. A household appliance, characterized in that, Includes a filter screen, on which a dust detection device as described in any one of claims 1-7 is installed.

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