Air conditioner evaporator dust detection device, self-cleaning air conditioner and self-cleaning method

Abstract

The embodiment of the present application discloses an air conditioner evaporator dust detection device, a self-cleaning air conditioner and a self-cleaning method, wherein a light emitting diode is used to emit light to the surface of the air conditioner evaporator to be tested, and the surface to be tested of the air conditioner evaporator will reflect the light to the light receiving detection component. Due to the principle of diffuse reflection of light, when the surface to be tested of the air conditioner evaporator is free of dust, the light path of the reflection is different from that when the surface to be tested of the air conditioner evaporator is covered with dust. Therefore, the distribution of light reflected back from the tested surface can be analyzed by the light receiving detection component, thereby analyzing and determining the amount of dust accumulation on the tested surface. This technical solution overcomes the problem that the surface of the air conditioner evaporator is complex and it is not convenient to detect the dust thickness. When the air conditioner detection device detects that the dust on the surface of the air conditioner evaporator exceeds the standard, the self-cleaning function of the air conditioner can be activated, thereby solving the problem that the start time of the air conditioner self-cleaning function cannot be determined.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of photoelectric sensors, and in particular to an air conditioner evaporator dust detection device, a self-cleaning air conditioner, and a self-cleaning method. Background Art

[0002] As people's requirements for air conditioning use increase, users hope to enjoy a comfortable environment while reducing the maintenance of air conditioning. After using traditional air conditioners for a period of time, dust and mold are easily accumulated inside, resulting in reduced cooling effect and air pollution. Therefore, the self-cleaning function came into being. When the air conditioner enters the self-cleaning function, the temperature difference generated by the indoor unit evaporator will condense the moisture in the air entering the air conditioner into water vapor. When the temperature is below zero, frost will form on the surface of the evaporator, and then the evaporator will be heated to defrost. The defrosted water droplets flow to drive dust and bacteria through the condensation drain pipe, and finally clean the indoor unit evaporator.

[0003] So under what circumstances will the air conditioner use this self-cleaning function? This requires dust detection on the surface of the evaporator. At present, the detection technology for dust on the surface of the evaporator in the air conditioner is still in a blank field. Although there are sensors for dust detection on the surface of other objects, the surface of the air conditioner evaporator is complex. It is composed of condenser tubes and fins. The unevenness of its surface makes general dust detection unsuitable for the surface of the air conditioner evaporator. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides an air conditioner evaporator dust detection device.

[0006] A second aspect of the present invention provides a self-cleaning air conditioner.

[0007] A third aspect of the present invention provides an air conditioner self-cleaning method.

[0008] In view of this, according to a first aspect of an embodiment of the present application, a dust detection device for an air conditioner evaporator is proposed, comprising:

[0009] A light emitting diode, the light emitting diode is used to emit light to the surface of the air conditioner evaporator under test;

[0010] A shaping lens group, wherein the shaping lens group is arranged between the surface of the air conditioner evaporator to be tested and the light emitting diode;

[0011] A light receiving detection component is used to detect the distribution of light reflected from the surface of the air conditioner evaporator being tested.

[0012] In a feasible implementation, it also includes:

[0013] A printed circuit board, the light emitting diode and the light receiving detection component are integrated on the printed circuit board.

[0014] In a feasible implementation, it also includes:

[0015] The light emitting diode, the shaping lens group and the light receiving detection component are all arranged inside the shell, one side of the shell is parallel to the surface of the air conditioner evaporator to be tested, and the side of the shell parallel to the surface of the air conditioner evaporator to be tested is flat and translucent.

[0016] In a feasible implementation manner, the shaping lens assembly includes:

[0017] A light shaping lens, which is used to shape the light beam emitted by the light emitting diode to the measured surface of the air conditioner evaporator;

[0018] The light-receiving shaping lens is used to shape the light reflected by the measured surface of the air-conditioning evaporator.

[0019] In a feasible implementation manner, the shaping lens assembly further includes:

[0020] An optical baffle is arranged between the light-emitting shaping lens and the light-receiving shaping lens.

[0021] In a feasible implementation manner, the light-emitting shaping lens is a conical shaping lens;

[0022] The light receiving shaping lens is an arched shaping lens.

[0023] In a feasible implementation manner, the light detection component includes:

[0024] The first phototransistor;

[0025] The second phototransistor;

[0026] The third photosensitive transistor, the first photosensitive transistor, the second photosensitive transistor and the third photosensitive transistor are arranged in a straight line with the light emitting diode, and the distances from the light emitting diode are from near to far.

[0027] In a feasible implementation manner, the light emitting diode and the light receiving detection component are parallel to the measured surface of the air conditioner evaporator and the distance between them is 10 mm.

[0028] According to a second aspect of an embodiment of the present application, a self-cleaning air conditioner is provided, comprising: an air conditioner body;

[0029] The air conditioner evaporator dust detection device of any one of the above items, wherein the air conditioner evaporator surface dust accumulation detection device is arranged inside the air conditioner;

[0030] An air conditioner evaporator, wherein the air conditioner evaporator dust detection device is arranged inside the air conditioner, and its detection end faces the detected surface of the air conditioner evaporator;

[0031] A cleaning component is electrically connected to the air conditioner evaporator dust detection device.

[0032] According to a third aspect of an embodiment of the present application, a method for self-cleaning an air conditioner is provided, which is applied to the self-cleaning air conditioner described above, comprising:

[0033] Set the start interval time of the dust accumulation detection device on the air conditioner evaporator surface;

[0034] The air conditioner evaporator dust detection device starts when the start time is reached;

[0035] The air conditioner evaporator dust detection device detects the dust accumulation amount on the tested surface of the air conditioner evaporator;

[0036] If the dust accumulation does not reach the threshold, the process ends;

[0037] If the dust accumulation reaches a threshold, the air conditioner evaporator dust detection device activates the cleaning component, and the cleaning component cleans the air conditioner evaporator;

[0038] After the cleaning component is cleaned, the air conditioner evaporator dust detection device detects the tested surface of the air conditioner evaporator again;

[0039] If the dust accumulation does not reach the threshold, the process ends;

[0040] If the dust accumulation amount reaches the threshold, return to the above-mentioned step of "the air conditioner evaporator dust detection device wherein the cleaning component cleans the air conditioner evaporator".

[0041] Compared with the prior art, the present invention includes at least the following beneficial effects: wherein, the light emitting diode is used to emit light to the surface of the air-conditioning evaporator to be tested, and the surface to be tested of the air-conditioning evaporator will reflect the light to the light receiving detection component. Due to the principle of diffuse reflection of light, when the surface to be tested of the air-conditioning evaporator is free of dust, the reflected light path is different from that when the surface to be tested of the air-conditioning evaporator is covered with dust. For example, the more dust accumulates on the surface of the air-conditioning evaporator, the more obvious its diffuse reflection of light is. Therefore, the distribution of light reflected back from the tested surface can be analyzed by the light receiving detection component, thereby analyzing and determining the amount of dust accumulation on the tested surface.

[0042] Among them, the shaping lens group is used to control the beam direction of the light emitted by the light emitting diode. The light emitted by the light emitting diode passes through the shaping lens group to reach the air conditioner evaporator, so that the light can be concentrated on the surface to be tested of the air conditioner evaporator. At the same time, the light diffusely reflected by the air conditioner evaporator passes through the shaping lens group, so that the light can accurately act on the light receiving detection component. This setting adjusts the optical path, increases the light that the light receiving detection component can receive, and reduces the sensitivity requirements of the light receiving detection component.

[0043] This technical solution overcomes the problem that the surface of the air conditioner evaporator is complex and it is not convenient to detect the thickness of dust by utilizing the principle of diffuse reflection of light. When the air conditioner detection device detects that the dust on the surface of the air conditioner evaporator exceeds the standard, the self-cleaning function of the air conditioner can be activated, thereby solving the problem of not being able to determine the start time of the air conditioner self-cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0045] Figure 1 A cross-sectional structural block diagram of an air conditioner evaporator dust detection device according to an embodiment of the present application;

[0046] Figure 2 A structural block diagram of a housing of an air conditioner evaporator dust detection device according to an embodiment of the present application;

[0047] Figure 3 A schematic diagram of the light flux received by a first phototransistor under mirror reflection in an embodiment provided by the present application;

[0048] Figure 4 A schematic diagram of the light flux received by the first phototransistor at 20% diffuse light according to an embodiment of the present application;

[0049] Figure 5 A schematic diagram of the light flux received by the first phototransistor at 40% diffuse light according to an embodiment of the present application;

[0050] Figure 6 A schematic diagram of the light flux received by the first phototransistor at 60% diffuse light according to an embodiment of the present application;

[0051] Figure 7 A schematic diagram of the light flux received by the first phototransistor at 80% diffuse light according to an embodiment of the present application;

[0052] Figure 8A schematic diagram of the light flux received by the second phototransistor on the mirror surface in an embodiment provided by the present application;

[0053] Fig. 9 A schematic diagram of the light flux received by the second phototransistor at 20% diffuse reflection in an embodiment provided by the present application;

[0054] Fig.10 A schematic diagram of the light flux received by the second phototransistor at 40% diffuse reflection in an embodiment provided by the present application;

[0055] Fig.11 A schematic diagram of the light flux received by the second phototransistor at 60% diffuse reflection in an embodiment provided by the present application;

[0056] Fig.12 A schematic diagram of the light flux received by the second phototransistor at 80% diffuse reflection in an embodiment provided by the present application;

[0057] Fig.13 A schematic diagram of the light flux received by the third phototransistor under mirror reflection in one embodiment provided by the present application;

[0058] Fig.14 A schematic diagram of the luminous flux received by the third phototransistor at 20% diffuse reflection in an embodiment provided by the present application;

[0059] Fig.15 A schematic diagram of the light flux received by the third phototransistor at 40% diffuse reflection in an embodiment provided by the present application;

[0060] Fig.16 A schematic diagram of the light flux received by the third phototransistor at 60% diffuse reflection in an embodiment provided by the present application;

[0061] Fig.17 A schematic diagram of the light flux received by the third phototransistor at 80% diffuse reflection in an embodiment provided by the present application;

[0062] in, Figure 1-2 The corresponding relationship between the reference numerals and the component names is as follows:

[0063] 100, light emitting diode; 200, shaping lens group; 300, light receiving detection component; 400, housing; 500, printed circuit board;

[0064] 210, light-emitting shaping lens; 220, light-receiving shaping lens; 230, optical baffle;

[0065] 310, a first phototransistor; 320, a second phototransistor; 330, a third phototransistor. DETAILED DESCRIPTION

[0066] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0067] like Figure 1-2 As shown, according to the first aspect of an embodiment of the present application, an air conditioner evaporator dust detection device is proposed, comprising: a light emitting diode 100, wherein the light emitting diode 100 is used to emit light to the surface of the air conditioner evaporator under test; a shaping lens group 200, wherein the shaping lens group 200 is arranged between the surface of the air conditioner evaporator under test and the light emitting diode 100; and a light receiving detection component 300, wherein the light receiving detection component 300 is used to detect the distribution of light reflected by the surface of the air conditioner evaporator under test.

[0068] The air conditioner evaporator dust detection device provided in the embodiment of the present application includes a light emitting diode 100, a shaping lens group 200, and a light receiving detection component 300.

[0069] Among them, the light-emitting diode 100 is used to emit light to the surface of the air-conditioning evaporator to be tested. The surface to be tested of the air-conditioning evaporator will reflect the light to the light-receiving detection component. Due to the principle of diffuse reflection of light, when the surface to be tested of the air-conditioning evaporator is free of dust and when the surface to be tested of the air-conditioning evaporator is covered with dust, the reflected light path is different. For example, the more dust accumulates on the surface of the air-conditioning evaporator, the more obvious its diffuse reflection of light is. Therefore, the distribution of light reflected back from the tested surface can be analyzed by the light-receiving detection component 300, so as to analyze and determine the amount of dust accumulation on the tested surface.

[0070] Among them, the shaping lens group 200 is used to control the beam direction of the light emitted by the light emitting diode 100. The light emitted by the light emitting diode 100 passes through the shaping lens group 200 to reach the air conditioner evaporator, so that the light can be concentrated on the surface to be tested of the air conditioner evaporator. At the same time, the light diffusely reflected by the air conditioner evaporator passes through the shaping lens group 200, so that the light can accurately act on the light receiving detection component 300. This setting adjusts the optical path, increases the light that can be received by the light receiving detection component 300, and reduces the sensitivity requirements of the light receiving detection component 300.

[0071] This technical solution overcomes the problem that the surface of the air conditioner evaporator is complex and it is not convenient to detect the thickness of dust by utilizing the principle of diffuse reflection of light. When the air conditioner detection device detects that the dust on the surface of the air conditioner evaporator exceeds the standard, the self-cleaning function of the air conditioner can be activated, thereby solving the problem of not being able to determine the start time of the air conditioner self-cleaning function.

[0072] like Figure 1-2 As shown, it also includes: a printed circuit board 500, and the light emitting diode 100 and the light receiving detection component 300 are integrated on the printed circuit board 500.

[0073] In this technical solution, the light-emitting diode 100 and the light-receiving detection component 300 are integrated into the printed circuit board 500, which firstly increases the integration of the dust detection device. At the same time, the printed circuit board 500 can amplify the circuit design and detect tiny current changes to achieve precise sensing, which can effectively improve the accuracy of dust detection.

[0074] like Figure 1-2 As shown, it also includes: a shell 400, the light-emitting diode 100, the shaping lens group 200 and the light-receiving detection component 300 are all arranged inside the shell 400, one side of the shell 400 is parallel to the surface of the air-conditioning evaporator to be tested, and the side of the shell 400 parallel to the surface of the air-conditioning evaporator to be tested is flat and light-transmissive.

[0075] In this technical solution, the light-emitting diode 100, the shaping lens group 200 and the light-receiving detection component 300 are all arranged inside the outer shell 400. The setting of the outer shell 400 can improve the integrity of the dust detection component. At the same time, the outer shell 400 can isolate the interference of external light on the dust detection component, thereby further improving the accuracy of the dust detection component.

[0076] It is understandable that one side surface of the housing 400 is parallel to the detected surface of the air conditioner evaporator, and the side surface of the housing 400 is made of a highly light-transmitting material, while the remaining surfaces of the housing 400 are made of an opaque material.

[0077] like Figure 1-2 As shown, the shaping lens group 200 includes: a light-emitting shaping lens 210, which is used to shape the light beam emitted by the light-emitting diode 100 to the measured surface of the air-conditioning evaporator; and a light-receiving shaping lens 220, which is used to shape the light reflected by the measured surface of the air-conditioning evaporator.

[0078] In this technical solution, the shaping lens group 200 includes a light-emitting shaping lens 210 and a light-receiving shaping lens 220, wherein the light-emitting shaping lens 210 is used to adjust the light emitted by the light-emitting diode 100 so that it can irradiate the air-conditioning evaporator more concentratedly.

[0079] The light shaping lens 220 is used to adjust the light reflected back from the air conditioner evaporator so that it can be fed back to the light detection component 300 in a more concentrated manner.

[0080] like Figure 1-2As shown, the shaping lens assembly 200 further includes an optical baffle 230 , which is disposed between the light-emitting shaping lens 210 and the light-receiving shaping lens 220 .

[0081] In this technical solution, the shaping lens group 200 also includes an optical baffle 230, which is arranged between the light-emitting shaping lens 210 and the light-receiving shaping lens 220. It can be understood that the optical baffle 230 is also arranged between the light-emitting diode 100 and the light-receiving detection component 300. The optical baffle 230 is made of an opaque material. This setting can prevent the light emitted by the light-emitting diode 100 from directly irradiating the light-receiving detection component 300 and affecting the analysis and judgment of the light-receiving detection component 300.

[0082] like Figure 1-2 As shown, the light-emitting shaping lens 210 is a conical shaping lens; and the light-receiving shaping lens 220 is an arched shaping lens.

[0083] In this technical solution, the light shaping lens 210 is a conical shaping lens, which can make the radial light emitted by the light emitting diode 100 more concentratedly irradiate the air conditioner evaporator.

[0084] The light-receiving shaping lens 220 is an arched shaping lens, which can integrate the components reflected by the air-conditioning evaporator into a long strip of light, making it easier for the light-receiving detection component 300 to analyze the reflected light.

[0085] like Figure 1-2 As shown, the light-receiving detection component 300 includes: a first photosensitive transistor 310; a second photosensitive transistor 320; and a third photosensitive transistor 330. The first photosensitive transistor 310, the second photosensitive transistor 320, and the third photosensitive transistor 330 are arranged in a straight line with the light-emitting diode 100, and the distance from the light-emitting diode 100 is from near to far.

[0086] In this technical solution, the light detecting component 300 includes a first phototransistor 310 , a second phototransistor 320 and a third phototransistor 330 . Meanwhile, the first to third phototransistors 330 are arranged in a straight line, and the first phototransistor 310 is closest to the light emitting diode 100 .

[0087] In the air conditioner, the first phototransistor 310 is located on the light path of the light emitted by the light emitting diode 100 after being refracted by the air conditioner evaporator.

[0088] It is understandable that the less dust there is on the surface of the air conditioner evaporator, the smoother its surface is, the more light refraction it produces and the less diffuse reflection it produces. When the dust on the air conditioner evaporator increases, the more diffuse reflection it produces, which causes a change in the light path, thereby causing a change in the light flux passing through the three phototransistors.

[0089] With this arrangement, the amount of dust accumulation on the surface of the air conditioner evaporator can be determined by analyzing the light flux received by the first to third photosensors.

[0090] like Figure 1-2 As shown, the light emitting diode 100 and the light receiving detection component 300 are parallel to the measured surface of the air conditioner evaporator and the distance between them is 10 mm.

[0091] In this technical solution, the distance between the light emitting diode 100 and the light receiving detection component 300 is 10 mm. This setting not only leaves space for receiving reflected light, but also prevents the received reflected light from being too weak due to the long distance.

[0092] like Figure 3-17 As shown, in this embodiment, when there is no dust on the surface of the air conditioner evaporator, the light flux received by the second phototransistor 320 is the largest, which is 1.850%. When the dust accumulation gradually increases, the light flux received by the first phototransistor 310 and the second phototransistor 320 gradually decreases to 0.062% and 0.226%, respectively, and the light received by the third phototransistor 330 gradually increases to 0.026%, thereby detecting different dust accumulation levels on the surface of the air conditioner evaporator. In this embodiment, the specific relationship between the surface diffuse reflectivity and the light flux received by the phototransistor surface is as follows:

[0093]

[0094]

[0095] According to the second aspect of the embodiment of the present application, a self-cleaning air conditioner is proposed, comprising: an air conditioner body; an air conditioner evaporator dust detection device according to any of the above items, wherein the air conditioner evaporator surface dust accumulation detection device is arranged inside the air conditioner; an air conditioner evaporator, wherein the air conditioner evaporator dust detection device is arranged inside the air conditioner, and its detection end faces the detected surface of the air conditioner evaporator; and a cleaning component, wherein the cleaning component is electrically connected to the air conditioner evaporator dust detection device.

[0096] In this technical solution, the cleaning component of the self-cleaning air conditioner is electrically connected to the dust detection device, and the cleaning frequency of the self-cleaning air conditioner is controlled by the dust detection device. When the dust detection device detects excessive dust on the surface of the air conditioner evaporator, the cleaning component is controlled to start and clean the inside of the air conditioner.

[0097] This setting not only ensures that the dust in the air conditioner can be cleaned in time when there is excessive dust, but also avoids the waste caused by starting the cleaning component when cleaning is not necessary.

[0098] According to a third aspect of an embodiment of the present application, a method for self-cleaning an air conditioner is provided, which is applied to the self-cleaning air conditioner described above, comprising:

[0099] Set the start interval time of the dust accumulation detection device on the air conditioner evaporator surface;

[0100] The air conditioner evaporator dust detection device starts when the start time is reached;

[0101] The air conditioner evaporator dust detection device detects the dust accumulation amount on the tested surface of the air conditioner evaporator;

[0102] If the dust accumulation does not reach the threshold, the process ends;

[0103] If the dust accumulation reaches a threshold, the air conditioner evaporator dust detection device activates the cleaning component, and the cleaning component cleans the air conditioner evaporator;

[0104] After the cleaning component is cleaned, the air conditioner evaporator dust detection device detects the tested surface of the air conditioner evaporator again;

[0105] If the dust accumulation does not reach the threshold, the process ends;

[0106] If the dust accumulation amount reaches the threshold, return to the above-mentioned step of "the air conditioner evaporator dust detection device wherein the cleaning component cleans the air conditioner evaporator".

[0107] In this technical solution, a re-inspection step is added. After the cleaning component finishes cleaning the air-conditioning evaporator, the dust detection device re-detects the dust on the surface of the air-conditioning evaporator. If it still fails, it returns to the cleaning step to avoid the situation where the air-conditioning cleaning component fails to clean properly the first time.

[0108] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0109] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0110] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0111] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioner evaporator dust detection device, characterized in that: include: A light emitting diode, the light emitting diode is used to emit light to the surface of the air conditioner evaporator under test; A shaping lens group, wherein the shaping lens group is arranged between the surface of the air conditioner evaporator to be tested and the light emitting diode; A light receiving detection component is used to detect the distribution of light reflected from the surface of the air conditioner evaporator being tested.

2. The air conditioner evaporator dust detection device according to claim 1, characterized in that: Also includes: A printed circuit board, the light emitting diode and the light receiving detection component are integrated on the printed circuit board.

3. The dust detection device for air conditioner evaporator according to claim 1, characterized in that: Also includes: The light emitting diode, the shaping lens group and the light receiving detection component are all arranged inside the shell, one side of the shell is parallel to the surface of the air conditioner evaporator to be tested, and the side of the shell parallel to the surface of the air conditioner evaporator to be tested is flat and translucent.

4. The dust detection device for air conditioner evaporator according to claim 1, characterized in that: The shaping lens assembly comprises: A light shaping lens, which is used to shape the light beam emitted by the light emitting diode to the measured surface of the air conditioner evaporator; The light-receiving shaping lens is used to shape the light reflected by the measured surface of the air-conditioning evaporator.

5. The dust detection device for air conditioner evaporator according to claim 4, characterized in that: The shaping lens assembly also includes: An optical baffle is arranged between the light-emitting shaping lens and the light-receiving shaping lens.

6. The dust detection device for air conditioner evaporator according to claim 4, characterized in that: The light-emitting shaping lens is a conical shaping lens; The light receiving shaping lens is an arched shaping lens.

7. The air conditioner evaporator dust detection device according to claim 1, characterized in that: The light detection component comprises: The first phototransistor; The second phototransistor; The third photosensitive transistor, the first photosensitive transistor, the second photosensitive transistor and the third photosensitive transistor are arranged in a straight line with the light emitting diode, and the distances from the light emitting diode are from near to far.

8. The dust detection device for air conditioner evaporator according to claim 1, characterized in that: The light emitting diode and the light receiving detection component are parallel to the measured surface of the air conditioner evaporator and the distance between them is 10 mm.

9. A self-cleaning air conditioner, characterized in that: include: Air conditioner body; The air conditioner evaporator dust detection device according to any one of claims 1 to 8, wherein the air conditioner evaporator surface dust accumulation detection device is arranged inside the air conditioner; An air conditioner evaporator, wherein the air conditioner evaporator dust detection device is arranged inside the air conditioner, and its detection end faces the detected surface of the air conditioner evaporator; A cleaning component is electrically connected to the air conditioner evaporator dust detection device.

10. An air conditioner self-cleaning method, characterized in that: The self-cleaning air conditioner as claimed in claim 9 comprises: Set the start interval time of the dust accumulation detection device on the air conditioner evaporator surface; The air conditioner evaporator dust detection device starts when the start time is reached; The air conditioner evaporator dust detection device detects the dust accumulation amount on the tested surface of the air conditioner evaporator; If the dust accumulation does not reach the threshold, the process ends; If the dust accumulation reaches a threshold, the air conditioner evaporator dust detection device activates the cleaning component, and the cleaning component cleans the air conditioner evaporator; After the cleaning component is cleaned, the air conditioner evaporator dust detection device detects the tested surface of the air conditioner evaporator again; If the dust accumulation does not reach the threshold, the process ends; If the dust accumulation amount reaches the threshold, return to the above-mentioned "air conditioner evaporator dust detection device wherein the cleaning component cleans the air conditioner evaporator" step.

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