Air purifier and control method thereof

Abstract

The present application relates to the field of automatic control technology, and specifically to an air purifier and a control method thereof, comprising: a filter unit, a blower unit and a fan unit connected in sequence from bottom to top; wherein the fan unit is installed at the air outlet of the blower unit, the fan unit can adjust the pitch angle and horizontal 360-degree rotation, a pitch distance sensor is installed on the fan unit, at least 4 lateral distance sensors are installed in sequence around the side wall of the air purifier, and the spacing between each lateral distance sensor and its adjacent lateral distance sensor is the same; a control unit connected to the filter unit, the blower unit, the fan unit, the pitch distance sensor and the at least 4 lateral distance sensors respectively. The present application automatically adjusts the outlet angle and direction by detecting the surrounding space, so that the indoor air can flow to the maximum, thereby improving the purification speed and efficiency.

Description

Technical Field

[0001] The present application relates to the field of automatic control technology, and in particular to an air purifier and a control method thereof. Background Art

[0002] Air purifier, also known as air cleaner, air freshener, purifier, refers to a product that can absorb, decompose or transform various air pollutants (generally including PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.), effectively improving the cleanliness of the air. It is mainly divided into household, commercial, industrial and building types.

[0003] The air outlet direction of the air purifiers currently on the market is either upward or sideways. When users place them in different environmental conditions, they cannot adapt to the environment and provide the most suitable air outlet angle to speed up indoor air circulation and improve purification efficiency. Summary of the invention

[0004] In view of the above problems, the present application provides an air purifier and a control method thereof, which solves the technical problem in the related art that the air outlet direction of the air purifier is fixed and cannot adapt to the environment, resulting in low purification efficiency.

[0005] In a first aspect, the present application provides an air purifier, the air purifier comprising:

[0006] A filter unit, a blower unit and a fan unit connected in sequence from bottom to top;

[0007] The fan unit is installed at the air outlet of the fan unit, the fan unit can adjust the pitch angle and rotate 360 ​​degrees horizontally, a pitch distance sensor is installed on the fan unit, and at least 4 lateral distance sensors are installed in sequence around the side wall of the air purifier, and the spacing between each lateral distance sensor and its adjacent lateral distance sensor is the same;

[0008] A control unit connected to the filter unit, the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors respectively.

[0009] In some embodiments, the pitch distance sensor is an optical distance sensor or an ultrasonic distance sensor.

[0010] In some embodiments, the lateral distance sensor is an optical distance sensor or an ultrasonic distance sensor.

[0011] In some embodiments, the filter unit is a filter screen, a filter screen group, a filter element or a filter element group.

[0012] In some embodiments, the pitch distance sensor is used to measure the distance between the fan unit and an obstacle in the air outlet direction, and feed back the measured distance information to the control unit.

[0013] In some embodiments, the lateral distance sensor is used to measure the distance between the air purifier and obstacles in the lateral direction, and feed back the measured distance information to the control unit.

[0014] In some embodiments, the control unit is used to calculate the maximum pitch angle of the fan unit based on the distance information fed back by the pitch distance sensor, and control the fan unit to adjust to the maximum pitch angle and maintain it, or control the fan unit to reciprocate between a preset initial position and the maximum pitch angle.

[0015] In some embodiments, the control unit is used to monitor the usage level of the filtering unit and remind the user when it is detected that the usage level of the filtering unit reaches a preset threshold.

[0016] In some embodiments, the pitch angle of the fan unit ranges from 0 degrees to 90 degrees.

[0017] In a second aspect, a control method of an air purifier is applied to the air purifier according to the first aspect, the method comprising:

[0018] After receiving the start-up instruction sent by the user, the control unit controls the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors to start running;

[0019] The control unit calculates the maximum pitch angle of the fan unit according to the distance information fed back by the pitch distance sensor, and controls the fan unit to adjust to the maximum pitch angle and maintain it, or controls the fan unit to reciprocate between a preset initial position and the maximum pitch angle;

[0020] The control unit calculates a wind sweeping angle of the fan unit in a horizontal direction according to distance information fed back by the at least four lateral distance sensors, and controls the fan unit to rotate and sweep the wind according to the wind sweeping angle.

[0021] The present application provides an air purifier and a control method thereof, comprising: a filter unit, a blower unit and a fan unit connected in sequence from bottom to top; wherein the fan unit is installed at the air outlet of the blower unit, the fan unit can adjust the pitch angle and horizontal 360-degree rotation, a pitch distance sensor is installed on the fan unit, at least 4 lateral distance sensors are installed in sequence around the side wall of the air purifier, and the spacing between each lateral distance sensor and its adjacent lateral distance sensor is the same; a control unit connected to the filter unit, the blower unit, the fan unit, the pitch distance sensor and the at least 4 lateral distance sensors respectively. The present application detects the surrounding space and automatically adjusts the outlet angle and direction so that the indoor air can flow to the maximum, thereby improving the purification speed and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an air purifier provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the placement of the air purifier provided in the embodiment of the present application;

[0025] Figure 3 A flowchart of another method for controlling an air purifier provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present application and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present application.

[0027] As can be seen from the background technology, the air outlet direction of the air purifiers currently on the market is either upward or sideways. When users place them in different environmental conditions, they cannot adapt to the environment to provide the most suitable air outlet angle to speed up indoor air circulation and improve purification efficiency.

[0028] In view of this, the present application provides an air purifier and a control method thereof, which solves the technical problem in the related art that the air outlet direction of the air purifier is fixed and cannot adapt to the environment, resulting in low purification efficiency.

[0029] Embodiment 1

[0030] Figure 1 A schematic diagram of the structure of an air purifier provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the air purifier includes:

[0031] The filter unit 101, the blower unit 102 and the fan unit 103 are connected in sequence from bottom to top;

[0032] The fan unit is installed at the air outlet of the fan unit, and the fan unit can adjust the pitch angle and rotate 360 ​​degrees horizontally. A pitch distance sensor 105 is installed on the fan unit, and at least 4 lateral distance sensors 106 are installed in sequence around the side wall of the air purifier, and the spacing between each lateral distance sensor and its adjacent lateral distance sensor is the same;

[0033] A control unit 104 is respectively connected to the filter unit, the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors.

[0034] It should be noted that if Figure 1 As shown, the fan unit in the present application can adjust the pitch angle in the vertical direction and rotate 360 ​​degrees in the horizontal direction, so as to sweep the wind over the largest area and maximize the flow of indoor air, thereby improving the purification speed and efficiency.

[0035] It should be further explained that the control unit is generally installed on the outer wall of the air purifier and has a control button because it needs to receive control instructions from the user. In another embodiment of the present application, the control unit is installed at the center of the fan unit, such as Figure 1 As shown in the front view of the fan unit, the control unit is installed at the center of the fan unit, and the pitch distance sensor is also installed at the center. In some embodiments, the control unit may be provided with switch buttons, wind sweep control buttons, display screens and other units. If the pitch distance sensor is an optical distance sensor, it is necessary to leave space for the sensor to transmit and receive optical signals at the location of the control unit.

[0036] In some embodiments, the pitch distance sensor is an optical distance sensor or an ultrasonic distance sensor.

[0037] It should be noted that the pitch distance sensor in the present application includes but is not limited to an optical distance sensor or an ultrasonic distance sensor, as long as it can meet the distance measurement function required by the present application.

[0038] In some embodiments, the lateral distance sensor is an optical distance sensor or an ultrasonic distance sensor.

[0039] It should be noted that the lateral distance sensor in the present application includes but is limited to an optical distance sensor or an ultrasonic distance sensor, as long as it can meet the distance measurement function required by the present application.

[0040] In some embodiments, the filter unit is a filter screen, a filter screen group, a filter element or a filter element group.

[0041] It should be noted that the filter unit in the present application includes but is limited to a filter net, a filter net group, a filter element or a filter element group, as long as it can meet the air purification function required by the present application.

[0042] In some embodiments, the pitch distance sensor is used to measure the distance between the fan unit and an obstacle in the air outlet direction, and feed back the measured distance information to the control unit.

[0043] It should be noted that, in some embodiments, the preset initial position of the fan unit is horizontal placement, and the air outlet is vertically upward. At this time, the pitch distance sensor measures the distance between the obstacle directly above the fan unit and the fan unit, and feeds back the measured distance to the control unit for comparison. When the measured obstacle distance is greater than the preset pitch distance, for example, greater than the diameter of the fan unit, it will not affect the pitch angle adjustment of the fan unit. At this time, the control unit controls the fan unit to adjust the pitch angle, for example, from the horizontal preset initial position to a vertical 90-degree position.

[0044] It should be further explained that when the fan unit adjusts the pitch angle, the distance angle measured by the pitch distance sensor also changes with the angle of the fan unit. At this time, continuous distance detection is maintained. Once the detected distance is compared and determined by the control unit to be less than or equal to the preset pitch distance, the control unit controls the fan unit to adjust to the maximum pitch angle without colliding with an obstacle.

[0045] In some embodiments, the lateral distance sensor is used to measure the distance between the air purifier and obstacles in the lateral direction, and feed back the measured distance information to the control unit.

[0046] It should be noted that the lateral distance sensors in the present application are installed on the side wall of the air purifier, surround the air purifier, and are evenly arranged. The distance between each lateral distance sensor and the adjacent distance sensor is the same. For example, when 4 lateral distance sensors are installed on the side wall of the air sensor, they are installed around the air purifier. Looking down at a vertical time angle, you can see that the 4 lateral distance sensors have the same spacing, and are placed at 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. Similarly, when installing other numbers of lateral distance sensors, they are installed in the same way.

[0047] In some embodiments, the control unit is used to calculate the maximum pitch angle of the fan unit based on the distance information fed back by the pitch distance sensor, and control the fan unit to adjust to the maximum pitch angle and maintain it, or control the fan unit to reciprocate between a preset initial position and the maximum pitch angle.

[0048] It should be noted that the control unit compares the distance measured by the pitch distance sensor with the preset pitch distance, and obtains the maximum pitch angle of the fan unit when there is no obstacle. The pitch angle is the preset maximum pitch angle, for example, 90 degrees. If the control unit determines that the distance between the obstacle and the fan unit is less than or equal to the preset pitch distance, the control unit calculates the maximum pitch angle of the fan unit without colliding with the obstacle, and controls the fan unit to adjust to the maximum pitch angle without colliding with the obstacle.

[0049] It should be further explained that, the fan unit is at the maximum pitch angle and remains stationary, and reciprocates between a preset initial position and the maximum pitch angle. These are two modes of the fan unit, which can be selected according to needs.

[0050] In some embodiments, the control unit is used to monitor the usage level of the filtering unit and remind the user when it is detected that the usage level of the filtering unit reaches a preset threshold.

[0051] In some embodiments, the pitch angle of the fan unit ranges from 0 degrees to 90 degrees.

[0052] It should be noted that 0 degrees is the preset initial position of the fan unit in the horizontal position, and 90 degrees is the preset maximum pitch angle. When the distance fed back by the pitch distance sensor to the control unit is greater than the preset pitch distance, the fan unit is adjusted to the preset maximum pitch angle of 90 degrees.

[0053] In some embodiments, the control unit is used to calculate the wind sweeping angle of the fan unit in the horizontal direction according to the distance information fed back by the at least four lateral distance sensors, and control the fan unit to rotate and sweep the wind according to the wind sweeping angle.

[0054] It should be noted that after the lateral distance sensor measures the distance, it will feed back to the control unit. The control unit compares the distance measured by the lateral distance sensor with the preset lateral distance. If the distance measured by the lateral distance sensor is less than or equal to the preset lateral distance, it means that the obstacle in this direction is relatively close. At this time, the efficiency of air replacement flow for sweeping in the reverse direction is low, so the sweeping in this direction is abandoned. If the distance measured by the lateral distance sensor is greater than the preset lateral distance, it means that the obstacle in this direction is relatively far, and it is determined to sweep in this direction.

[0055] Specifically, Figure 2 As shown, it is a schematic diagram of the placement of the air purifier. Taking four lateral distance sensors as an example, the placement position is A. Looking down at a vertical time angle, it can be seen that the four lateral distance sensors have the same spacing, and are placed at 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. If the control unit determines that the distances of 0 degrees and 90 degrees are less than the preset lateral distances according to the distances measured by the lateral distance sensors, the air purifier does not sweep air in the directions of 0 degrees and 90 degrees. At this time, the nearest adjacent sensor to the lateral distance sensor that is determined not to sweep air is found. The nearest adjacent sensor to the 0 degree lateral distance sensor is the lateral distance sensor at 270 degrees, and the nearest adjacent sensor to the 90 degree lateral distance sensor is the lateral distance sensor at 180 degrees. Then the angle between 180 degrees and 270 degrees is used as the calculated sweep angle, and the fan unit is controlled to rotate and sweep air according to the sweep angle.

[0056] It should be noted that if Figure 2 As shown, taking 4 lateral distance sensors as an example, the placement position is B. Looking down at a vertical time angle, it can be seen that the 4 lateral distance sensors have the same spacing, and are placed at 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. If the control unit determines that the distances of 90 degrees and 270 degrees are less than the preset lateral distances according to the distances measured by the lateral distance sensors, the air purifier does not sweep air in the directions of 90 degrees and 270 degrees. At this time, the nearest adjacent sensors to the lateral distance sensors that are determined not to sweep air are found to be the lateral distance sensors located at 0 degrees and 180 degrees. However, since the angle range between the lateral distance sensors at 0 degrees and 180 degrees is blocked by the lateral sensors at 90 degrees and 270 degrees that have been determined not to sweep air, a continuous sweeping angle cannot be formed. At this time, the control unit makes a judgment to determine whether the number of lateral distance sensors that have been determined not to sweep air is greater than or equal to N-1 lateral distance sensors, where N is the number of lateral distance sensors, and N is a positive integer greater than or equal to 4. If so, no sweeping is performed; if not, 360-degree sweeping is performed. In this way, intelligent wind sweeping mode control can be achieved when various lateral distance sensors are blocked.

[0057] In summary, the embodiment of the present application provides an air purifier, comprising: a filter unit, a blower unit and a fan unit connected in sequence from bottom to top; wherein the fan unit is installed at the air outlet of the blower unit, the fan unit can adjust the pitch angle and horizontal 360-degree rotation, a pitch distance sensor is installed on the fan unit, at least 4 lateral distance sensors are installed in sequence around the side wall of the air purifier, and the spacing between each lateral distance sensor and its adjacent lateral distance sensor is the same; a control unit connected to the filter unit, the blower unit, the fan unit, the pitch distance sensor and the at least 4 lateral distance sensors respectively. The present application automatically adjusts the outlet angle and direction by detecting the surrounding space, so that the indoor air can flow to the maximum, thereby improving the purification speed and efficiency.

[0058] Embodiment 2

[0059] Based on the air purifier disclosed in the above embodiment of the present invention, Figure 3 Specifically disclosed is an air purifier control method applied to the air purifier.

[0060] like Figure 3 As shown, an embodiment of the present invention discloses a control method for an air purifier, which is applied to the air purifier described in the first aspect, and the method includes:

[0061] S301, after receiving a start instruction sent by a user, the control unit controls the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors to start running;

[0062] S302, the control unit calculates the maximum pitch angle of the fan unit according to the distance information fed back by the pitch distance sensor, and controls the fan unit to adjust to the maximum pitch angle and maintain it, or controls the fan unit to reciprocate between a preset initial position and the maximum pitch angle;

[0063] S303, the control unit calculates the wind sweeping angle of the fan unit in the horizontal direction according to the distance information fed back by the at least four lateral distance sensors, and controls the fan unit to rotate and sweep the wind according to the wind sweeping angle.

[0064] It should be noted that the control unit compares the distance measured by the pitch distance sensor with the preset pitch distance, and obtains the maximum pitch angle of the fan unit when there is no obstacle. The pitch angle is the preset maximum pitch angle, for example, 90 degrees. If the control unit determines that the distance between the obstacle and the fan unit is less than or equal to the preset pitch distance, the control unit calculates the maximum pitch angle of the fan unit without colliding with the obstacle, and controls the fan unit to adjust to the maximum pitch angle without colliding with the obstacle.

[0065] It should be further explained that, the fan unit is at the maximum pitch angle and remains stationary, and reciprocates between a preset initial position and the maximum pitch angle. These are two modes of the fan unit, which can be selected according to needs.

[0066] It should be noted that after the lateral distance sensor measures the distance, it will feed back to the control unit. The control unit compares the distance measured by the lateral distance sensor with the preset lateral distance. If the distance measured by the lateral distance sensor is less than or equal to the preset lateral distance, it means that the obstacle in this direction is relatively close. At this time, the efficiency of air replacement flow for sweeping in the reverse direction is low, so the sweeping in this direction is abandoned. If the distance measured by the lateral distance sensor is greater than the preset lateral distance, it means that the obstacle in this direction is relatively far, and it is determined to sweep in this direction.

[0067] Specifically, Figure 2 As shown, it is a schematic diagram of the placement of the air purifier. Taking four lateral distance sensors as an example, the placement position is A. Looking down at a vertical time angle, it can be seen that the four lateral distance sensors have the same spacing, and are placed at 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. If the control unit determines that the distances of 0 degrees and 90 degrees are less than the preset lateral distances according to the distances measured by the lateral distance sensors, the air purifier does not sweep air in the directions of 0 degrees and 90 degrees. At this time, the nearest adjacent sensor to the lateral distance sensor that is determined not to sweep air is found. The nearest adjacent sensor to the 0 degree lateral distance sensor is the lateral distance sensor at 270 degrees, and the nearest adjacent sensor to the 90 degree lateral distance sensor is the lateral distance sensor at 180 degrees. Then the angle between 180 degrees and 270 degrees is used as the calculated sweep angle, and the fan unit is controlled to rotate and sweep air according to the sweep angle.

[0068] It should be noted that if Figure 2As shown, taking 4 lateral distance sensors as an example, the placement position is B. Looking down at a vertical time angle, it can be seen that the 4 lateral distance sensors have the same spacing, and are placed at 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. If the control unit determines that the distances of 90 degrees and 270 degrees are less than the preset lateral distances according to the distances measured by the lateral distance sensors, the air purifier does not sweep air in the directions of 90 degrees and 270 degrees. At this time, the nearest adjacent sensors to the lateral distance sensors that are determined not to sweep air are found to be the lateral distance sensors located at 0 degrees and 180 degrees. However, since the angle range between the lateral distance sensors at 0 degrees and 180 degrees is blocked by the lateral sensors at 90 degrees and 270 degrees that have been determined not to sweep air, a continuous sweeping angle cannot be formed. At this time, the control unit makes a judgment to determine whether the number of lateral distance sensors that have been determined not to sweep air is greater than or equal to N-1 lateral distance sensors, where N is the number of lateral distance sensors, and N is a positive integer greater than or equal to 4. If so, no sweeping is performed; if not, 360-degree sweeping is performed. In this way, intelligent wind sweeping mode control can be achieved when various lateral distance sensors are blocked.

[0069] In summary, the embodiment of the present application provides a control method for an air purifier, comprising: after receiving a start-up instruction sent by a user, the control unit controls the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors to start running; the control unit calculates the maximum pitch angle of the fan unit according to the distance information fed back by the pitch distance sensor, and controls the fan unit to adjust to the maximum pitch angle and maintain it, or controls the fan unit to reciprocate between a preset initial position and the maximum pitch angle; the control unit calculates the horizontal sweep angle of the fan unit according to the distance information fed back by the at least four lateral distance sensors, and controls the fan unit to rotate and sweep the wind according to the sweep angle. The present application detects the surrounding space and automatically adjusts the wind outlet angle and direction, so that the indoor air can flow to the maximum extent, thereby improving the purification speed and efficiency.

[0070] In the several embodiments provided in the present application, it should be understood that the disclosed method can also be implemented in other ways. The method embodiments described above are merely illustrative.

[0071] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0072] Although the implementation methods disclosed in this application are as above, the above contents are only the implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. An air purifier, characterized in that: The air purifier comprises: A filter unit, a blower unit and a fan unit connected in sequence from bottom to top; The fan unit is installed at the air outlet of the fan unit, the fan unit can adjust the pitch angle and rotate 360 ​​degrees horizontally, a pitch distance sensor is installed on the fan unit, and at least 4 lateral distance sensors are installed in sequence around the side wall of the air purifier, and the spacing between each lateral distance sensor and its adjacent lateral distance sensor is the same; a control unit connected to the filter unit, the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors respectively; The lateral distance sensor is used to measure the distance between the air purifier and the obstacle in the lateral direction, and feed back the measured distance information to the control unit, and the control unit calculates the wind sweeping angle of the fan unit in the horizontal direction according to the distance information fed back by the at least four lateral distance sensors, and controls the fan unit to rotate and sweep the wind according to the wind sweeping angle; The control unit is used to determine the wind sweep angle at least in the following manner: When the distance information fed back by the lateral distance sensor is less than a preset lateral distance, determining that the direction corresponding to the lateral distance sensor is not swept wind, and determining each first lateral distance sensor adjacent to the lateral distance sensor determined to be not swept wind; determining whether a wind sweeping angle formed between the first lateral distance sensors is blocked by the lateral distance sensor determined as not sweeping the wind; When the wind sweeping angles formed between the first lateral distance sensors are all blocked by the lateral distance sensors that are determined to be not sweeping, it is determined whether the number of the lateral distance sensors that are determined to be not sweeping is greater than or equal to N-1. If so, no wind sweeping is performed; if not, 360° wind sweeping is performed, where N is the total number of the lateral distance sensors.

2. The air purifier according to claim 1, characterized in that: The pitch distance sensor is an optical distance sensor or an ultrasonic distance sensor.

3. The air purifier according to claim 1, characterized in that: The lateral distance sensor is an optical distance sensor or an ultrasonic distance sensor.

4. The air purifier according to claim 1, characterized in that: The filter unit is a filter net, a filter net group, a filter element or a filter element group.

5. The air purifier according to claim 1, characterized in that: The pitch distance sensor is used to measure the distance between the fan unit and obstacles in the air outlet direction, and feed back the measured distance information to the control unit.

6. The air purifier according to claim 1, characterized in that: The control unit is used to calculate the maximum pitch angle of the fan unit according to the distance information fed back by the pitch distance sensor, and control the fan unit to adjust to the maximum pitch angle and maintain it, or control the fan unit to reciprocate between a preset initial position and the maximum pitch angle.

7. The air purifier according to claim 1, characterized in that: The control unit is used to monitor the usage level of the filtering unit and remind the user when it is detected that the usage level of the filtering unit reaches a preset threshold.

8. The air purifier according to claim 1, characterized in that: The pitch angle of the fan unit ranges from 0 degrees to 90 degrees.

9. A control method for an air purifier, characterized in that: Applied to the air purifier according to any one of claims 1 to 8, the method comprising: After receiving the start-up instruction sent by the user, the control unit controls the blower unit, the fan unit, the pitch distance sensor and the at least four lateral distance sensors to start running; The control unit calculates the maximum pitch angle of the fan unit according to the distance information fed back by the pitch distance sensor, and controls the fan unit to adjust to the maximum pitch angle and maintain it, or controls the fan unit to reciprocate between a preset initial position and the maximum pitch angle; The control unit calculates a wind sweeping angle of the fan unit in the horizontal direction according to the distance information fed back by the at least four lateral distance sensors, and controls the fan unit to rotate and sweep the wind according to the wind sweeping angle.

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