Air supply device and method for detecting clogging thereof

Abstract

The application provides an air supply device and a dirty blockage detection method thereof. The air supply device comprises an air supply body, a filter assembly and a detection assembly. The air supply body is provided with an air supply channel. The filter assembly is installed in the air supply channel. The detection assembly comprises a detection fan blade, a resistance piece and a detection piece. The detection fan blade is rotatably installed in the air supply channel. The resistance piece is used for applying resistance to the detection fan blade to hinder the rotation of the detection fan blade. The detection piece is in communication connection with the air supply body and is used for detecting whether the detection fan blade rotates. In the application, the air supply device detects whether the detection fan blade rotates by using the detection piece to judge the dirty blockage condition of the filter assembly. When the rotation torque of the detection fan blade is less than the resistance, the detection fan blade stops rotating, the detection piece generates a stop rotation signal and feeds back to the air supply body, the air supply body stops working, and the user is reminded to replace the filter assembly in time, so that the air supply device is prevented from being damaged due to too much impurities attached to the filter assembly, and the reliability and safety of the air supply device are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air supply equipment, in particular to an air supply equipment and a dirty blockage detection method thereof. BACKGROUND

[0002] With the improvement of living quality, people pay more and more attention to health, and the requirement for air quality is also higher and higher. The demand for fans with filtering effect is increasing. The fan with filter can filter out dust, lint and other impurities in the air in advance when blowing, and send clean and healthy wind, which is deeply loved by consumers. However, after using the filter, if the filter is not replaced in time, the dust, lint and other impurities attached to the filter will reduce the air permeability, and the fan flow will be affected, resulting in the increase of the pressure of the input flow. If the fan runs in this state for a long time, the motor and mainboard power will rise, and continuous operation will damage the fan. SUMMARY

[0003] Therefore, it is necessary to provide an air supply equipment and a dirty blockage detection method thereof aiming at the above problems.

[0004] The technical scheme is as follows:

[0005] On the one hand, an air supply equipment is provided, comprising:

[0006] an air supply body provided with an air supply channel;

[0007] a filter assembly installed in the air supply channel;

[0008] a detection assembly comprising a detection fan blade, a resistance piece and a detection piece, the detection fan blade being rotatably installed in the air supply channel, the resistance piece being used for applying resistance to the rotation of the detection fan blade, and the detection piece being in communication connection with the air supply body and being used for detecting whether the detection fan blade with resistance rotates.

[0009] The technical scheme is further described as follows:

[0010] In one embodiment, the air supply body comprises a rear net and an air duct body provided with the air supply channel, the air supply channel has an air inlet, the rear net is installed on the air inlet, and the detection fan blade is rotatably installed on the rear net.

[0011] In one embodiment, the resistance piece comprises a first magnetic body and a second magnetic body, the first magnetic body is installed on the detection fan blade, the second magnetic body is installed on the rear net, and the second magnetic body is used for being attracted to the first magnetic body to apply the resistance to the detection fan blade.

[0012] In one of the embodiments, the detecting blade includes a detecting blade, and the first magnetic body is arranged on the detecting blade.

[0013] In one of the embodiments, the back net is provided with a mounting channel in communication with the air inlet, and the mounting channel is provided with a mounting bracket, and the detecting blade and the second magnetic body are mounted on the mounting bracket.

[0014] In one of the embodiments, the first magnetic body is a first magnet, and the second magnetic body is a second magnet, and the first magnet and the second magnet are opposite in magnetic property.

[0015] In one of the embodiments, the detecting member includes a detecting circuit and a conductive contact, the detecting circuit is provided with a positive contact and a negative contact, one of the detecting circuit and the conductive contact is mounted on the detecting blade, and the other is mounted on the back net, and the conductive contact is configured to be connected to the positive contact and the negative contact to be conducted when the detecting blade rotates to a preset position relative to the back net, and to be separated from at least one of the positive contact and the negative contact when the detecting blade rotates away from the preset position.

[0016] In one of the embodiments, the detecting blade includes a blade body provided with a mounting cavity, and the detecting circuit is mounted in the mounting cavity, and the positive contact and the negative contact are extended from a side of the blade body close to the conductive contact.

[0017] In one of the embodiments, the air supply body further includes an air supply blade rotatably mounted in the air supply channel, and the air supply blade is coaxially arranged with the detecting blade.

[0018] In one of the embodiments, the filter assembly includes a filter screen bracket and a filter screen, the filter screen is mounted on the filter screen bracket, and the filter screen bracket is fixed in the air supply channel.

[0019] In another aspect, a dirty blockage detection method is provided, which is applied to the air supply device, and includes:

[0020] The air supply body is powered on to generate a wind field in the air supply channel, and the detecting blade is driven to rotate by the wind field in the air supply channel;

[0021] The detecting member detects whether the detecting blade rotates, when the detecting member detects that the detecting blade rotates, the detecting member generates a normal signal and feeds back to the air supply body, and the air supply body works normally, and when the detecting member detects that the detecting blade stops rotating, the detecting member generates a stop rotating signal and feeds back to the air supply body, the air supply body stops working, and reminds the user to replace the filter assembly in time.

[0022] In the above embodiments, the air supply device and its dirt / clogging detection method, when in use, the air supply main body is powered on, and air from the external environment is drawn into the air supply channel, generating an airflow field within the channel. This causes the detection fan blades to rotate passively, and the detection element detects the rotation state of the fan blades. The air in the air supply channel is filtered by the filter assembly and then blown out to provide clean, healthy air. At this time, the filter assembly is in its initial use state, with no dust, lint, or other impurities on its surface, resulting in high air penetration and a large intake air volume. The rotational torque on the detection fan blades is greater than the resistance of the resistance element, causing the fan blades to rotate passively. The detection element generates a normal signal and feeds it back to the air supply main body, which then operates normally. As the air supply main body continues to operate, the amount of dust, lint, and other impurities adhering to the filter assembly increases, the air penetration of the filter assembly gradually decreases, the airflow field within the air supply channel gradually decreases, and the rotational torque on the detection fan blades gradually decreases. When the rotational torque on the detection fan blade is less than the resistance of the resistance component to the detection fan blade, the detection fan blade stops rotating, the detection component generates a stop signal and feeds it back to the air supply unit, the air supply unit stops working, and reminds the user to replace the filter component in time to avoid the air supply equipment from malfunctioning due to too many impurities attached to the filter component, thereby improving the reliability and safety of the air supply equipment. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an air supply device according to one embodiment.

[0026] Figure 2 for Figure 1 Exploded view of the air supply equipment.

[0027] Figure 3 for Figure 2 A schematic diagram of the structure of the air duct body.

[0028] Figure 4 for Figure 2 A schematic diagram of the structure of the rear mesh in the image.

[0029] Figure 5 for Figure 2A structural schematic view of the detection fan and the detection piece in the air supply device.

[0030] Figure 6 A structural schematic view of the detection fan and the detection piece in the air supply device. Figure 5

[0031] Figure 7 A structural schematic view of the detection fan and the detection piece in the air supply device. Figure 2

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 10, air supply device; 100, air supply body; 110, air supply passage; 120, back net; 121, installation passage; 122, installation support; 123, first installation position; 124, third installation position; 130, air duct body; 140, air supply blade; 150, motor; 160, blade knob; 170, front net; 180, net cover; 200, filter assembly; 210, filter net support; 220, filter net; 300, detection assembly; 310, detection blade; 311, detection blade; 312, second installation position; 313, installation cavity; 314, blade body; 320, resistance piece; 321, first magnetic body; 322, second magnetic body; 330, detection piece; 331, detection circuit; 332, conductive contact; 333, positive contact; 334, negative contact. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0035] As shown in FIGS. 1 and 2, in one embodiment, an air supply device 10 is provided, which includes an air supply body 100, a filter assembly 200, and a detection assembly 300. The air supply body 100 is provided with an air supply passage 110. The filter assembly 200 is installed in the air supply passage 110. The detection assembly 300 includes a detection blade 310, a resistance piece 320, and a detection piece 330. The detection blade 310 is rotatably installed in the air supply passage 110. The resistance piece 320 is used to apply resistance to the detection blade 310 to hinder the rotation of the detection blade 310. The detection piece 330 is communicatively connected to the air supply body 100 and is used to detect whether the detection blade 310 subjected to the resistance rotates. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, in one embodiment, an air supply device 10 is provided, which includes an air supply body 100, a filter assembly 200, and a detection assembly 300. The air supply body 100 is provided with an air supply passage 110. The filter assembly 200 is installed in the air supply passage 110. The detection assembly 300 includes a detection blade 310, a resistance piece 320, and a detection piece 330. The detection blade 310 is rotatably installed in the air supply passage 110. The resistance piece 320 is used to apply resistance to the detection blade 310 to hinder the rotation of the detection blade 310. The detection piece 330 is communicatively connected to the air supply body 100 and is used to detect whether the detection blade 310 subjected to the resistance rotates.

[0036] ​​In use, the air in the external environment is sucked into the air supply channel 110, and the air supply channel 110 generates a wind field to passively rotate the detection fan blade 310. The detection member 330 detects the rotation state of the detection fan blade 310, and the air in the air supply channel 110 is filtered by the filter assembly 200 and blown out to provide clean and healthy wind. At this time, the filter assembly 200 is in an initial use state, and the surface of the filter assembly 200 is free of dust and lint impurities in the air, the air penetration is high, the suction air volume is large, the detection fan blade 310 is subjected to a larger torque than the resistance of the resistance member 320 to the detection fan blade 310, the detection fan blade 310 is passively rotated, the detection member 330 generates a normal signal and feeds back to the air supply body 100, and the air supply body 100 works normally. With the continuous work of the air supply body 100, the amount of dust and lint impurities attached to the filter assembly 200 increases, the air penetration of the filter assembly 200 gradually decreases, the wind field in the air supply channel 110 gradually decreases, and the torque of the detection fan blade 310 gradually decreases. When the torque of the detection fan blade 310 is less than the resistance of the resistance member 320 to the detection fan blade 310, the detection fan blade 310 stops rotating, the detection member 330 generates a stop signal and feeds back to the air supply body 100, and the air supply body 100 stops working and reminds the user to replace the filter assembly 200 in time, avoiding the failure of the air supply device 10 due to too much impurities attached to the filter assembly 200, and improving the reliability and safety of the air supply device 10.

[0037] It should be noted that the detection fan blade 310 will not actively rotate after being powered on. The resistance of the resistance member 320 to the detection fan blade 310 can be flexibly adjusted according to the actual use needs, thereby adjusting the maximum amount of impurities attached to the filter assembly 200.

[0038] The air supply body 100 can be any structure for air supply in the prior art. The filter assembly 200 can be any filter structure capable of filtering dust and lint impurities in the air in the prior art.

[0039] Specifically, in this embodiment, the filter assembly 200 is detachably installed in the air supply channel 110. The filter assembly 200 includes a filter screen bracket 210 and a filter screen 220, the filter screen 220 is installed on the filter screen bracket 210, and the filter screen bracket 210 is fixed in the air supply channel 110. In this way, the convenience of assembling the filter assembly 200 is improved.

[0040] The number of detection assemblies 300 can be flexibly adjusted according to actual needs. The relative positions of the filtering assembly 200 and the detection fan blade 310 in the air supply channel 110 can be flexibly adjusted according to actual needs. For example, along the axial direction of the air supply channel 110, the detection fan blade 310 can be installed on the side of the filtering assembly 200 close to the air inlet, or on the side of the filtering assembly 200 away from the air inlet, or detection fan blades 310 can be installed on both sides of the filtering assembly 200.

[0041] As shown in Figure 2 , Figure 3 and Figure 4 , optionally, the air supply body 100 includes a rear net 120 and an air duct body 130 provided with the air supply channel 110, the air supply channel 110 has an air inlet, the rear net 120 is installed on the air inlet, and the detection fan blade 310 is rotatably installed on the rear net 120. In this way, the detection fan blade 310 can be pre-installed on the rear net 120, and then installed in the air supply channel 110 through the rear net 120, improving the convenience of assembling the air supply device 10.

[0042] As shown in Figure 2 , in one embodiment, the resistance piece 320 includes a first magnetic body 321 and a second magnetic body 322, the first magnetic body 321 is installed on the detection fan blade 310, and the second magnetic body 322 is installed on the rear net 120, and the second magnetic body 322 is used to attract the first magnetic body 321 to exert resistance on the detection fan blade 310.

[0043] The number of first magnetic bodies 321 and the number of second magnetic bodies 322 can be flexibly adjusted according to actual needs. One of the first magnetic body 321 and the second magnetic body 322 is set as a first magnet, and the other is set as a second magnet or a magnetic metal piece that can be attracted by the first magnet. In this embodiment, the first magnetic body 321 is set as a first magnet, and the second magnetic body 322 is set as a second magnet, and the magnetic properties of the first magnet and the second magnet are opposite. In this way, the second magnetic body 322 can exert stable and reliable resistance on the detection fan blade 310 through the first magnetic body 321, improving the reliability of the air supply device 10.

[0044] It should be noted that the second magnetic body 322 can continuously exert resistance on the detection fan blade 310 through the first magnetic body 321, or intermittently exert resistance on the detection fan blade 310 through the first magnetic body 321.

[0045] As shown in Figure 2 and Figure 5As shown, the detection blade 311 is provided with the first magnetic body 321. In this way, the second magnetic body 322 intermittently applies resistance to the detection blade 310 through the first magnetic body 321, so that the detection blade 310 can rotate at a larger speed, and the first magnetic body 321 can pass through the magnetic attraction area of the second magnetic body 322 at a faster speed, thereby ensuring smooth rotation of the detection blade 310.

[0046] As shown in Figure 2 , Figure 6 and Figure 7 , optionally, the rear net 120 is provided with a mounting channel 121 in communication with the air inlet, and the mounting channel 121 is provided with a mounting bracket 122, and the detection blade 310 and the second magnetic body 322 are both mounted on the mounting bracket 122. In this way, the convenience of assembling the air supply device 10 is improved.

[0047] In the embodiment, the mounting bracket 122 is arranged at one end of the mounting channel 121 close to the air inlet. The detection blade 310 is mounted on the side of the mounting bracket 122 away from the air inlet and located in the mounting channel 121.

[0048] As shown in Figure 2 , Figure 4 and Figure 5 , in the embodiment, the mounting bracket 122 is provided with a first mounting position 123 for mounting the detection blade 310. The detection blade 311 is provided with a second mounting position 312 for mounting the first magnetic body 321. The mounting bracket 122 is further provided with a third mounting position 124 corresponding to the second mounting position 312, and the third mounting position 124 is used for mounting the second magnetic body 322.

[0049] In other embodiments, the resistance member 320 can also apply resistance to the detection blade 310 through friction fitting or other ways.

[0050] As shown in Figure 4 , Figure 5 and Figure 7 , in one embodiment, the detection member 330 includes a detection circuit 331 and a conductive contact 332, and the detection circuit 331 is provided with a positive contact 333 and a negative contact 334. One of the detection circuit 331 and the conductive contact 332 is mounted on the detection blade 310, and the other is mounted on the rear net 120. The conductive contact 332 is configured to be connected to the positive contact 333 and the negative contact 334 when the detection blade 310 rotates to a preset position (i.e., the position of the detection blade 310 relative to the rear net 120 as shown in Figure 7 , and disconnected from at least one of the positive contact 333 and the negative contact 334 when the detection blade 310 rotates away from the preset position.

[0051] Specifically, in the embodiment, when the detection blade 310 rotates to the preset position relative to the rear net 120, the conductive contact 332 is connected to the positive contact 333 and the negative contact 334, and the first magnetic body 321 and the second magnetic body 322 are attracted to each other. When the detection blade 310 rotates away from the preset position, the conductive contact 332 is separated from at least one of the positive contact 333 and the negative contact 334, and the first magnetic body 321 and the second magnetic body 322 are separated.

[0052] In other embodiments, the detection member 330 can also be a camera, a rotation speed sensor, or other devices capable of detecting whether the detection blade 310 rotates.

[0053] As shown in Figure 6 and Figure 7 Optionally, the detection blade 310 includes a blade body 314 provided with a mounting cavity 313, and the detection circuit 331 is mounted in the mounting cavity 313. The positive contact 333 and the negative contact 334 extend from a side of the blade body 314 close to the conductive contact 332. In this way, the detection blade 310 can protect the detection circuit 331 and improve the reliability of the air supply device 10.

[0054] Specifically, in the embodiment, a side of the blade body 314 close to the second magnetic body 322 is provided with a first mounting hole and a second mounting hole corresponding to the second magnetic body 322. The first mounting hole and the second mounting hole are in communication with the mounting cavity 313. The positive contact 333 extends out of the blade body 314 from the first mounting hole, and the negative contact 334 extends out of the blade body 314 from the second mounting hole.

[0055] As shown in Figure 2 In one embodiment, the air supply body 100 further includes an air supply blade 140 rotatably mounted in the air supply channel 110. The air supply blade 140 is coaxially arranged with the detection blade 310.

[0056] As shown in Figure 2 and Figure 3 Specifically, in the embodiment, the air supply body 100 further includes a motor 150 and a blade knob 160. An inner side wall of the air supply channel 110 is provided with a first bracket for mounting the motor 150 and a mounting groove for mounting the filter assembly 200. An output shaft of the motor 150 is suspended along an axial direction of the air supply channel 110. The air supply blade 140 is sleeved on the output shaft and is in transmission connection with the output shaft. The blade knob 160 is mounted on the output shaft to fix the air supply blade 140 on the output shaft. When the motor 150 is powered to rotate the output shaft at a high speed, the air supply blade 140 will rotate in the same direction as the output shaft, thereby achieving the air supply effect.

[0057] AsFigure 2 and Figure 3 As shown in the figure, in particular to the embodiment, the air supply main body 100 further comprises a front net 170 and a net cover 180, and the air supply channel 110 further has an air outlet opposite to the air inlet and outlet, and the front net 170 is installed at the air outlet. The net cover 180 is installed at the side of the installation channel 121 away from the air inlet. When the motor 150 is powered on, the motor 150 drives the air supply fan blade 140 to rotate, and the air in the external environment is respectively sucked into the air supply channel 110 through the rear net 120, the net cover 180 and the filter net 220, so that the air supply channel 110 generates an air field. In addition, the front net 170, the rear net 120 and the net cover 180 can all block the user's fingers from extending into the air supply channel 110, thereby improving the safety of the air supply device 10.

[0058] In one embodiment, a dirty blockage detection method is also provided, which is applied to the air supply device 10 in any of the above embodiments. The dirty blockage detection method at least comprises the following steps:

[0059] S100, the air supply main body 100 is powered on to generate an air field in the air supply channel 110, and the detection fan blade 310 is driven to rotate by the air field in the air supply channel 110;

[0060] S200, the detection piece 330 detects whether the detection fan blade 310 rotates; when the detection piece 330 detects that the detection fan blade 310 rotates, the detection piece 330 generates a normal signal and feeds back to the air supply main body 100, and the air supply main body 100 works normally; when the detection piece 330 detects that the detection fan blade 310 stops rotating, the detection piece 330 generates a stop signal and feeds back to the air supply main body 100, and the air supply main body 100 stops working, and reminds the user to replace the filter assembly 200 in time.

[0061] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or identifying the number of the indicated technical features. Thus, a feature limited to "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0063] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0065] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0066] It should also be understood that when interpreting the connection relationship or position relationship of the elements, although not explicitly described, the connection relationship and position relationship are interpreted to include an error range that should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximately" or "substantially" can mean within one or more standard deviations, without limitation.

[0067] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations do not conflict with each other, they should be considered to be within the scope of the present disclosure.

[0068] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An air supply device characterized by comprising: The application relates to an air supply device, which comprises the following components: an air supply body (100) provided with an air supply channel (110); a filter assembly (200) installed in the air supply channel (110); a detection assembly (300) comprising a detection fan blade (310), a resistance element (320) and a detection element (330), wherein the detection fan blade (310) is rotatably installed in the air supply channel (110), the resistance element (320) is used for applying resistance to the rotation of the detection fan blade (310), and the detection element (330) is in communication connection with the air supply body (100) and is used for detecting whether the detection fan blade (310) subjected to the resistance rotates or not. The air supply body (100) comprises a rear net (120) and an air duct body (130) provided with the air supply channel (110), the air supply channel (110) has an air inlet, the rear net (120) is installed on the air inlet, and the detection fan blade (310) is rotatably installed on the rear net (120). The resistance element (320) comprises a first magnetic body (321) and a second magnetic body (322), the first magnetic body (321) is installed on the detection fan blade (310), the second magnetic body (322) is installed on the rear net (120), and the second magnetic body (322) is used for being attracted to the first magnetic body (321) to apply the resistance to the detection fan blade (310). The detection element (330) comprises a detection circuit (331) and a conductive contact (332), the detection circuit (331) is provided with a positive contact (333) and a negative contact (334), one of the detection circuit (331) and the conductive contact (332) is installed on the detection fan blade (310), and the other is installed on the rear net (120), the conductive contact (332) is configured to be connected to the positive contact (333) and the negative contact (334) in conduction when the detection fan blade (310) rotates to a preset position relative to the rear net (120) and to be separated from at least one of the positive contact (333) and the negative contact (334) when the detection fan blade (310) rotates away from the preset position.

2. The air supply device according to claim 1, wherein The detection fan blade (310) comprises a detection blade (311), and the first magnetic body (321) is arranged on the detection blade (311). The rear net (120) is provided with a mounting channel (121) in communication with the air inlet, the mounting channel (121) is provided with a mounting bracket (122), and the detection fan blade (310) and the second magnetic body (322) are both installed on the mounting bracket (122).

3. The air supply device according to claim 1, wherein The first magnetic body (321) is a first magnet, the second magnetic body (322) is a second magnet, and the first magnet and the second magnet have opposite magnetism.

4. The air supply device according to claim 1, wherein The detection fan blade (310) comprises a fan blade body (314) provided with a mounting cavity (313), the detection circuit (331) is mounted in the mounting cavity (313), and the positive electrode contact (333) and the negative electrode contact (334) are both extended from one side of the fan blade body (314) close to the conductive contact (332).

5. The air supply device according to any one of claims 1 to 3, characterized by The air supply body (100) further comprises an air supply fan blade (140) rotatably mounted in the air supply channel (110), and the air supply fan blade (140) is coaxially arranged with the detection fan blade (310).

6. The air supply device according to any one of claims 1 to 3, characterized by The filter assembly (200) comprises a filter screen support (210) and a filter screen (220), the filter screen (220) is mounted on the filter screen support (210), and the filter screen support (210) is fixed in the air supply channel (110).

7. A dirt detection method applied to the air supply device (10) according to any one of claims 1 to 6, characterized in that, Comprise: The air supply body (100) is powered on to generate an air field in the air supply channel (110), and the detection fan blade (310) is driven to rotate by the air field in the air supply channel (110); The detection piece (330) detects whether the detection fan blade (310) rotates; when the detection piece (330) detects that the detection fan blade (310) rotates, the detection piece (330) generates a normal signal and feeds back to the air supply body (100), and the air supply body (100) normally works; when the detection piece (330) detects that the detection fan blade (310) stops rotating, the detection piece (330) generates a stop rotating signal and feeds back to the air supply body (100), the air supply body (100) stops working, and the user is reminded to replace the filter assembly (200) in time.

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