Air inlet device, air conditioner and control method thereof

Abstract

The application provides an air inlet device for being connected with an indoor unit of a fresh air conditioner, the indoor unit has an air inlet, and the air inlet device comprises: a fresh air pipeline, a fresh air inlet of the fresh air pipeline is open to the outside, and a fresh air outlet of the fresh air pipeline is open to the indoor; a first conversion component is provided with a fresh air hole and a suction hole which are independent of each other, the first conversion component has a fresh air working position and a cleaning working position; when the first conversion component is in the fresh air working position, the inlet of the fresh air hole is communicated with the fresh air outlet, and the outlet of the fresh air hole is communicated with the air inlet; when the first conversion component is in the cleaning working position, the outlet of the suction hole is communicated with the fresh air outlet, and the inlet of the suction hole is directly open to the indoor; and a fan assembly is capable of driving indoor air to enter the suction hole through the inlet of the suction hole, so that the technical problem that dust and impurities accumulated in the fresh air inlet pipeline of the fresh air conditioner cannot be cleaned in time, the burden of the filter screen is increased, and the quality of fresh air is reduced is solved.

Description

Technical Field

[0001] This invention belongs to the field of air conditioner technology, specifically relating to an air intake device, an air conditioner, and a control method thereof. Background Technology

[0002] The application of fresh air systems in air conditioning is becoming increasingly mature, with more and more air conditioners featuring this function. Especially in northwestern regions where air pollution is severe year-round, many consumers consider whether an air conditioner has a fresh air function when purchasing one. A fresh air conditioner introduces fresher, oxygen-rich outdoor air into the room and expel polluted, carbon dioxide-concentrated indoor air, thereby improving the user experience. Generally, even in cities, outdoor air is not completely clean and unpolluted. Before being introduced indoors, the fresh air needs to be purified, often requiring multi-stage filtration in its fresh air components to remove impurities. However, this approach overlooks a crucial point: because the fresh air duct is directly connected to the outside environment, the air inside is unpurified and contains a large amount of impurities. With prolonged use and without cleaning of the inner duct walls, dust accumulates. If this dust cannot be removed promptly, even the cleanest outdoor air will be contaminated after passing through the fresh air duct, increasing the workload of the filter and raising the cost of filter replacements for consumers.

[0003] In existing technology, a fan is directly installed inside the fresh air duct. The fan rotates forward when fresh air is needed and reverses to blow air through the duct when cleaning is required. However, this causes indoor air to pass through the indoor unit's filter before entering the fresh air duct. On the one hand, the filter dampens the airflow, reducing its speed. On the other hand, the repeated filtering increases the filter's workload. Furthermore, dust and impurities filtered from the indoor air accumulate on the filter's inward-facing side. This means that when the fresh air mode is activated, outdoor air passing through the filter will bring the dust from the inward-facing side of the filter back into the room, which is detrimental to improving the indoor environment and actually exacerbates indoor pollution.

[0004] How to effectively clean the inner wall of the fresh air intake duct is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] Therefore, the present invention provides an air intake device, an air conditioner and a control method thereof, which can solve the technical problem that the accumulation of dust and impurities in the fresh air intake duct of a fresh air conditioner increases the burden on the filter screen and reduces the quality of fresh air due to untimely cleaning.

[0006] The first aspect of the present invention provides an air intake device for connection to the indoor unit of a fresh air conditioning unit, the indoor unit having an air inlet, the air intake device comprising:

[0007] The fresh air duct has a fresh air inlet connected to the outside and a fresh air outlet connected to the inside.

[0008] The first conversion component is provided with independent fresh air inlets and air intake inlets, and has a fresh air working position and a cleaning working position. When the first conversion component is in the fresh air working position, the inlet of the fresh air inlet is connected to the fresh air outlet, and the outlet of the fresh air inlet is connected to the air inlet. When the first conversion component is in the cleaning working position, the outlet of the air intake inlet is connected to the fresh air outlet, and the inlet of the air intake inlet directly leads to the room.

[0009] When the first conversion component is in the cleaning working position, the fan assembly can drive indoor air to enter the air intake through the inlet of the air intake.

[0010] In some embodiments, the fresh air duct consists of a first section and a second section, the second section being located between the first section and the indoor unit; a second conversion component is provided between the first section and the second section, the second conversion component including an independent air inlet and an air outlet, the fan assembly being disposed within the air outlet; the second conversion component enables the air inlet to connect the first section and the second section, or enables the air outlet to connect the first section and the second section.

[0011] In some embodiments, the first conversion component is a first turntable, and the extension direction of the fresh air hole and the extension direction of the air intake hole both extend along the axial direction of the first turntable; the second conversion component is a second turntable, and the length direction of the air inlet hole and the length direction of the air outlet hole both extend along the axial direction of the second turntable.

[0012] The first turntable and the second turntable are coaxially arranged and can rotate synchronously.

[0013] In some embodiments, the fan assembly includes a flow guide, and an annular gap is formed between the flow guide and the inner wall surface of the air outlet.

[0014] In some embodiments, the flow guide is a conical block, and the fan assembly further includes an axial fan disposed between the conical block and the first conversion component, with the small end of the conical block facing the axial fan.

[0015] Secondly, the present invention also provides a fresh air air conditioner, including an indoor unit and the aforementioned air intake device, wherein the indoor unit is provided with an air inlet.

[0016] The present invention also provides a control method for a fresh air conditioner, the control method being used to control the fresh air conditioner;

[0017] The control method includes: detecting the cleanliness of the fresh air duct, determining whether the fresh air duct needs to be cleaned based on the cleanliness, and controlling the first conversion component to be in the cleaning working position when the fresh air duct needs to be cleaned.

[0018] In some embodiments, the fresh air air conditioner is provided with a first particle detection device and a second particle detection device. The first particle detection device is used to detect the particle concentration N1 at the fresh air outlet, and the second particle detection device is used to detect the particle concentration N2 at the fresh air inlet.

[0019] Detecting the cleanliness of the fresh air duct includes: obtaining the particle concentration N1 at the fresh air outlet and the particle concentration N2 at the fresh air inlet, and comparing N1 / N2 with a preset ratio.

[0020] In some embodiments, cleaning the fresh air duct is required, including sending a prompt message to the user for a preset duration when N1 / N2 is greater than or equal to a preset ratio, and the user does not perform any operation within the preset duration, or the user issues a command to clean the fresh air duct within the preset duration.

[0021] In some embodiments, the first conversion component is provided with a blocking part, and the first conversion component is configured to block the air inlet by the blocking part, and the fresh air air conditioner has a fresh air mode;

[0022] When the fresh air conditioner receives an instruction to execute the fresh air mode, it first executes the control method and then controls the first conversion component to be in the fresh air working position; and / or, when the fresh air conditioner receives an instruction to end the fresh air mode, it first executes the control method and then controls the sealing part of the first conversion component to seal the air inlet.

[0023] This invention, by positioning the first conversion component in the clean position, allows the air intake to directly face the room. When purging the fresh air duct, the fan assembly drives indoor air through the air intake to clean dust and impurities within the duct. The air entering the fresh air duct comes directly from the indoor air, bypassing the indoor unit. This avoids wind resistance generated by the indoor unit, effectively ensuring the airflow and velocity entering the air intake and fresh air duct. Furthermore, the air entering the air intake and fresh air duct bypasses the indoor unit's filter, reducing its workload and preventing dust and impurities from accumulating on the back of the filter (the side that accumulates dust and impurities when filtering outdoor air during fresh air function). This prevents the indoor unit from bringing dust and impurities from the filter into the room. Finally, the air intake faces directly into the room, allowing polluted indoor air to be exhausted outdoors through the air intake and fresh air duct, thus optimizing the indoor environment. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is an exploded view of the indoor unit and air intake device according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram showing the relationship between the air intake device and the indoor unit when the first conversion component is in the fresh air working position according to an embodiment of the present invention;

[0027] Figure 3 This is an embodiment of the present invention. Figure 2 A sectional view of a view;

[0028] Figure 4 This is a radial cross-sectional view of the air intake device along the fresh air duct when the first conversion component is in the fresh air working position according to an embodiment of the present invention;

[0029] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged view of point A in the image;

[0030] Figure 6 This is a cross-sectional view showing the relationship between the air intake device and the indoor unit when the first conversion component is in the cleaning working position according to an embodiment of the present invention;

[0031] Figure 7 This is a radial cross-sectional view of the air intake device along the fresh air duct when the first conversion component is in the clean working position according to an embodiment of the present invention;

[0032] Figure 8 This is an embodiment of the present invention. Figure 8 Enlarged view at point B in the middle;

[0033] Figure 9 This is a flowchart illustrating the process of turning on the fresh air conditioner according to an embodiment of the present invention;

[0034] Figure 10 This is a flowchart illustrating the process of shutting down the fresh air conditioner according to an embodiment of the present invention;

[0035] The reference numerals in the attached figures are as follows:

[0036] 1. Indoor unit; 101. Air inlet; 2. Fresh air duct; 201. First section of duct; 202. Second section of duct; 301. First conversion component; 302. Second conversion component; 3011. Fresh air vent; 3012. Air intake vent; 3021. Air inlet; 3022. Air outlet; 4. Air guide; 401. Annular spacer; 5. Axial fan; 6. Dual-axis motor. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of illustrative purposes and to facilitate understanding and reading by those skilled in the art, and are not intended to limit the conditions under which the invention can be implemented. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in the invention. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0041] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0043] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0044] This invention provides an air intake device, an air conditioner, and a control method for the air conditioner, which can solve the technical problem that the accumulation of dust and impurities in the fresh air intake duct of a fresh air conditioner increases the burden on the filter screen and reduces the quality of fresh air due to untimely cleaning.

[0045] Combined with appendix Figure 1-10 As shown, an air intake device is used to connect to the indoor unit 1 of a fresh air conditioning unit, the indoor unit 1 having an air inlet 101, the air intake device comprising:

[0046] Fresh air duct 2, fresh air duct 2, the fresh air inlet of the fresh air duct 2 is connected to the outside, and the fresh air outlet of the fresh air duct 2 is connected to the inside;

[0047] The first conversion component 301 is provided with independent fresh air inlet 3011 and air intake inlet 3012. The first conversion component 301 has a fresh air working position and a cleaning working position. When the first conversion component 301 is in the fresh air working position, the inlet of the fresh air inlet 3011 is connected to the fresh air outlet, and the outlet of the fresh air inlet 3011 is connected to the air inlet 101. When the first conversion component 301 is in the cleaning working position, the outlet of the air intake inlet 3012 is connected to the fresh air outlet, and the inlet of the air intake inlet 3012 directly leads to the room.

[0048] When the first conversion component 301 is in the cleaning working position, the fan assembly can drive indoor air to enter the air intake 3012 through the inlet of the air intake 3012.

[0049] When fresh air is needed indoors, the first conversion component 301 is in the fresh air working position, the outlet of the fresh air duct 2 is connected to the inlet of the fresh air hole 3011, and the outlet of the fresh air hole 3011 is connected to the air inlet 101 of the indoor unit 1; the fan blades inside the indoor unit 1 work to bring outdoor air into the indoor unit 1 through the fresh air duct 2 and the fresh air hole 3011; the outdoor air enters the indoor environment after being filtered by the filter inside the indoor unit 1, and some indoor units 1 are also equipped with a sterilization device to sterilize the outdoor air entering the indoor unit 1.

[0050] When the fresh air duct 2 needs to be cleaned, the first conversion component 301 is in the cleaning working position, the outlet of the fresh air duct 2 is connected to the outlet of the air intake 3012, and the inlet of the air intake 3012 is directly connected to the room without passing through the indoor unit 1 (the inlet of the air intake 3012 is disconnected from the air inlet 101); the fan assembly is working, and the indoor air enters the air intake 3012 directly without passing through the indoor unit 1 and is blown towards the fresh air duct 2 and then discharged to the outside from the inlet of the fresh air duct 2. When the air passes through the fresh air duct 2, it blows away the dust and impurities accumulated in the fresh air duct 2, ensuring the cleanliness of the fresh air duct 2. Since indoor air does not pass through indoor unit 1, on the one hand, the wind resistance generated by indoor unit 1 is avoided, effectively ensuring the air volume and velocity entering the air intake vent 3012 and fresh air duct 2; on the other hand, the air entering the air intake vent 3012 and fresh air duct 2 does not pass through the filter of indoor unit 1, reducing the burden on the filter and preventing dust and impurities from accumulating on the side of the filter facing indoors (when in fresh air mode, the front of the filter filters the air entering indoors, and dust and impurities from outdoor air accumulate on the front of the filter). This also prevents the accumulation of dust and impurities when indoor unit 1 is operating (fresh air mode). (Indoor air supply) The phenomenon of air from the outside to the inside bringing impurities and dust from the back of the filter into the room occurs; on the other hand, the inlet of the air intake 3012 faces directly into the room, which can exhaust indoor air (stale air) to the outside through the air intake 3012 and the fresh air duct 2, which is conducive to optimizing the indoor environment. The inlet of the air intake 3012 can be oriented downwards, or an exhaust pipe can be set so that the outlet of the exhaust pipe is connected to the inlet of the air intake pipe. The end of the exhaust pipe with the inlet is located at the bottom of the room, which is more conducive to exhausting the stale air at the bottom of the room.

[0051] Preferred, such as Figure 1-4 As shown in Figures 6-7, the fresh air duct 2 consists of a first section duct 201 and a second section duct 202, with the second section duct 202 located between the first section duct 201 and the indoor unit 1. A second conversion component 302 is provided between the first section duct 201 and the second section duct 202. The second conversion component 302 includes an independent air inlet 3021 and an air outlet 3022, with the fan assembly disposed within the air outlet 3022. The second conversion component 302 enables the air inlet 3021 to connect the first section duct 201 and the second section duct 202, or enables the air outlet 3022 to connect the first section duct 201 and the second section duct 202.

[0052] The fresh air duct 2 is divided into a first section 201 and a second section 202. The second section 202 is closer to the first conversion component 301 (away from the outside), while the first section 201 is farther from the first conversion component 301 (part of the first section 201 is located outdoors, and part is located indoors). When fresh air is supplied to the room, the outdoor air first flows through the first section 201 and then through the second section 202. Since the fresh air duct 2 is not perfectly straight, when the air flows in the fresh air duct 2, firstly, dust and impurities in the air will gradually fall downwards under the action of gravity; secondly, when the air collides with the inner wall of the fresh air duct 2, the dust and impurities in the air will gradually adhere to the pipe wall or fall to the pipe wall after bouncing off the pipe wall; thirdly, the static electricity generated when the air rubs against the fresh air duct 2 will gradually attract the dust and impurities in the air. Through the above three aspects, dust and impurities in the air will not only remain in the fresh air duct 2, but will also be distributed in the fresh air duct 2 in a manner that first increases and then decreases along the direction of fresh air flow. By dividing the fresh air duct 2 into a first section 201 and a second section 202, and placing the fan assembly in the air outlet 3022 on the second conversion component 302, it is beneficial for the fan assembly to be closer to the area in the fresh air duct 2 where more dust and impurities accumulate. In this way, the operation of the fan assembly can better clean the fresh air duct 2, improving the cleaning effect of dust and impurities in the fresh air duct 2. The dust and impurities in the second section 202 can be cleaned by the suction generated by the fan assembly.

[0053] Specifically, when fresh air is supplied to the room, the first conversion component 301 is adjusted to the fresh air working position, and the air inlet 3021 of the second conversion component 302 is connected to the first section pipe 201 and the second section pipe 202; when the fresh air duct 2 is cleaned, the first conversion component 301 is adjusted to the cleaning working position, and the air outlet 3022 of the second conversion component 302 is connected to the first section pipe 201 and the second section pipe 202, and the fan assembly located in the air outlet 3022 blows air to the second section pipe 202.

[0054] Preferred, such as Figure 1 Figure 4 and Figure 7 As shown, the first conversion component 301 is a first turntable, and the extension direction of the fresh air hole 3011 and the extension direction of the air intake hole 3012 both extend along the axial direction of the first turntable; the second conversion component 302 is a second turntable, and the length direction of the air inlet hole 3021 and the length direction of the air outlet hole 3022 both extend along the axial direction of the second turntable.

[0055] The first turntable and the second turntable are coaxially arranged and can rotate synchronously.

[0056] The second section of pipe 202 can be made into a straight pipe to reduce the flow resistance of air in the second section of pipe 202.

[0057] By setting the first turntable and the second turntable coaxially and rotating synchronously, the fresh air duct 2 can be effectively adjusted to be a duct for supplying fresh air to the room or for exhausting air to the outside; this facilitates the control of the first conversion component 301 and the second conversion component 302.

[0058] Gear teeth can be provided on the outer surfaces of the first and second rotating disks, that is, the first and second rotating disks are configured as gear structures; the first and second rotating disks are driven by a dual-axis motor 6, each of the two output shafts of the dual-axis motor 6 is provided with a gear, or gear teeth are directly machined on the output shafts. The two ends of the output shaft of the dual-axis motor 6 are respectively engaged with the first and second rotating disks. When the output shaft of the dual-axis motor 6 is working, it drives the first and second rotating disks to rotate, thereby connecting the air inlet 3021 to the first section pipe 201 and the second section pipe 202, and connecting the inlet of the fresh air inlet 3011 to the outlet of the fresh air duct 2; or, connecting the air outlet 3022 to the first section pipe 201 and the second section pipe 202, and connecting the outlet of the suction inlet 3012 to the outlet of the fresh air duct.

[0059] Alternatively, a fixed housing can be installed, housing the first rotating disk, the second rotating disk, and the dual-axis motor 6. The first section of pipe 201 and the second section of pipe 202 are also fixed to the housing. A through hole is provided on the housing. When the first rotating disk (first conversion component) rotates to the cleaning position, the inlet of the suction port 3012 is directly opposite the through hole. When the first rotating disk rotates to the fresh air position, the inlet of the suction port 3012 is offset from the through hole. This allows the air intake device to be mounted on the housing, making the housing and the air intake device a single module, thus improving the ease of installation. Flexible hoses can be installed through the through hole as needed. The inlets of the flexible hoses can be manually positioned in different areas of the room. This allows for the extraction of air from specific areas of the room when cleaning the fresh air duct 2, improving the removal of polluted air and thus enhancing the indoor environment.

[0060] Preferred, such as Figure 5 and Figure 7 As shown, the fan assembly includes a guide member 4, and an annular gap 401 is formed between the guide member 4 and the inner wall surface of the air outlet 3022.

[0061] The annular interval 401 serves two purposes. First, it allows the gas to flow along the inner wall of the air outlet 3022. Due to the wall-following effect, when the air enters the first section pipe 201, some of the air also flows along the inner wall of the second section pipe 202, thus improving the cleaning effect of the air on the dust and impurities adhering to the inner wall of the second section pipe 202. Second, it accelerates the airflow speed after passing through the annular interval 401. The higher airflow speed also improves the cleaning effect on the inner wall of the second section pipe 202.

[0062] Preferred, such as Figure 5 and Figure 7 As shown, the guide element 4 is a conical block, and the fan assembly also includes an axial fan 5, which is disposed between the conical block and the first conversion component 301, with the small end of the conical block facing the axial fan 5.

[0063] When the axial fan 5 is working, it causes air to flow from the small end of the cone block to the large end of the cone block. The conical surface of the cone block is the air guiding surface, which reduces the flow resistance of the gas. The aforementioned annular gap 401 is formed between the large end of the cone block and the inner wall surface of the air outlet 3022.

[0064] A cylindrical block can also be installed at the bottom of the conical block. An annular channel is formed between the cylindrical surface of the cylindrical block and the inner wall surface of the air outlet 3022. This annular channel guides the air after passing through the conical block, further ensuring that the air can flow along the inner wall surface of the second section pipe 202.

[0065] The present invention also provides a fresh air air conditioner, including an indoor unit 1 and the aforementioned air intake device, wherein the indoor unit 1 is provided with an air inlet 101.

[0066] The present invention also provides a control method for a fresh air conditioner, the control method being used to control the fresh air conditioner;

[0067] like Figure 9 and Figure 10 As shown, the control method includes: detecting the cleanliness of the fresh air duct 2, determining whether the fresh air duct 2 needs to be cleaned based on the cleanliness, and controlling the first conversion component 301 to be in the cleaning working position when the fresh air duct 2 needs to be cleaned.

[0068] Whether or not the fresh air duct 2 needs to be cleaned depends on the cleanliness of the fresh air duct 2. When cleaning of the fresh air duct 2 is required, the first conversion component 301 is controlled to be in the cleaning working position. If cleaning of the fresh air duct 2 is not required, the first conversion component 301 is in the fresh air working position.

[0069] Preferably, the fresh air air conditioner is equipped with a first particle detection device and a second particle detection device. The first particle detection device is used to detect the particle concentration N1 at the fresh air outlet, and the second particle detection device is used to detect the particle concentration N2 at the fresh air inlet.

[0070] Detecting the cleanliness of the fresh air duct 2 includes: obtaining the particle concentration N1 at the fresh air outlet and the particle concentration N2 at the fresh air inlet, and comparing N1 / N2 with a preset ratio.

[0071] Therefore, whether or not fresh air duct 2 needs cleaning cannot be determined solely by the particle concentration within it. The key is to consider the ratio of particle concentration when air enters duct 2 (flowing through its inlet) to particle concentration when air exits it (flowing through its outlet). In other words, it's the rate of change in particle concentration after the air passes through duct 2. A higher N1 / N2 ratio indicates that dust and impurities have entered the air within duct 2, increasing the particle concentration and suggesting excessive dust and impurities have accumulated. This design cleverly incorporates the impact of accumulated dust and impurities on the air quality within duct 2 into the decision-making process, improving the accuracy of cleanliness assessment. The preset ratio can be manually set, and the value can be adjusted based on local conditions and user needs. For example, a preset ratio of 1.05 would indicate that duct 2 needs cleaning when N1 / N2 ≥ 1.05. If only the particle concentration inside the fresh air duct 2 is tested, it may lead to a misjudgment because the outside air contains a lot of particles. Even if there are few dust and impurities inside the fresh air duct 2, if there are many particles in the outside air, it may be judged that the fresh air duct 2 needs to be cleaned.

[0072] Preferably, cleaning the fresh air duct 2 includes sending a prompt message to the user for a preset duration when N1 / N2 is greater than or equal to a preset ratio, and the user does not perform any operation within the preset duration, or the user issues a command to clean the fresh air duct 2 within the preset duration.

[0073] When the N1 / N2 ratio is detected to be greater than or equal to a preset value, the system will not immediately begin cleaning the fresh air duct 2. Instead, it will wait for a preset time. If no manual intervention is performed within this preset time, the fresh air duct 2 will be cleaned. If manual intervention is performed within this preset time, the cleaning will proceed according to the intervention. For example, if a user issues a command to clean the fresh air duct 2, the cleaning will begin immediately after the command is issued, without waiting for the preset time. If the user urgently needs to cool, heat, or supply fresh air to the room, a manual command can be issued to prevent the cleaning of the fresh air duct 2. This design improves the applicability of the air conditioner and better suits user habits.

[0074] Cleaning of the fresh air duct 2 may also include detecting the humidity inside the fresh air duct 2. When the humidity inside the fresh air duct 2 exceeds a preset value, the fresh air duct 2 should be cleaned. The purpose is to dry the moisture on the inner wall of the fresh air duct 2, preventing dust and impurities in the air from entering the fresh air duct 2 and mixing with the moisture on the inner wall of the fresh air duct 2, which would then adhere tightly to the inner wall of the fresh air duct 2. This would prevent the dust and impurities (which become mud after mixing with moisture) from being effectively cleaned when the fresh air duct 2 is cleaned later.

[0075] Preferably, the first conversion component 301 is provided with a blocking part, and the operation of the first conversion component 301 enables the blocking part to block the air inlet 101, and the fresh air air conditioner has a fresh air mode;

[0076] When the fresh air conditioner receives an instruction to execute the fresh air mode, it first executes the control method and then controls the first conversion component 301 to be in the fresh air working position; and / or, when the fresh air conditioner receives an instruction to end the fresh air mode, it first executes the control method and then controls the sealing part of the first conversion component 301 to block the air inlet 101.

[0077] Cleaning of the fresh air duct 2 is only performed before or after supplying fresh air to the indoor unit to avoid affecting the effectiveness of the fresh air supply. Upon receiving a command to supply fresh air, the fresh air conditioner first checks if the fresh air duct 2 needs cleaning. If so, it cleans the duct before supplying fresh air; otherwise, it directly enters the fresh air supply mode. When the fresh air conditioner receives a command to stop supplying fresh air, it first checks if the fresh air duct 2 needs cleaning. If so, it cleans the duct and then controls the first conversion component 301 to block the air inlet 101 via the sealing position to prevent outdoor dust, impurities, or insects from entering the indoor unit 1 through the fresh air duct 2; otherwise, it directly controls the first conversion component 301 to block the air inlet 101 via the sealing position.

[0078] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An air intake device for connecting to an indoor unit (1) of a fresh air conditioning system, said indoor unit (1) having an air inlet (101), characterized in that, The air intake device includes: Fresh air duct (2), the fresh air inlet of the fresh air duct (2) is connected to the outside, and the fresh air outlet of the fresh air duct (2) is connected to the indoor; A first conversion component (301) is provided with an independent fresh air inlet (3011) and an air intake inlet (3012). The first conversion component (301) has a fresh air working position and a cleaning working position. When the first conversion component (301) is in the fresh air working position, the inlet of the fresh air inlet (3011) is connected to the fresh air outlet, and the outlet of the fresh air inlet (3011) is connected to the air inlet (101). When the first conversion component (301) is in the cleaning working position, the outlet of the air intake inlet (3012) is connected to the fresh air outlet, and the inlet of the air intake inlet (3012) is directly connected to the room. When the first conversion component (301) is in the cleaning working position, the fan assembly can drive indoor air to enter the air intake (3012) through the inlet of the air intake (3012). The fresh air duct (2) consists of a first section (201) and a second section (202), with the second section (202) located between the first section (201) and the indoor unit (1). A second conversion component (302) is provided between the first section (201) and the second section (202), and the second conversion component (302) includes an independent air inlet (3021) and an air outlet (3022), with the fan assembly located within the air outlet (3022). The second conversion component (302) enables the air inlet (3021) to connect the first section (201) and the second section (202), or enables the air outlet (3022) to connect the first section (201) and the second section (202).

2. The air inlet device according to claim 1, characterized in that, The first conversion component (301) is a first turntable, and the extension direction of the fresh air hole (3011) and the extension direction of the air intake hole (3012) both extend along the axial direction of the first turntable; the second conversion component (302) is a second turntable, and the length direction of the air inlet hole (3021) and the length direction of the air outlet hole (3022) both extend along the axial direction of the second turntable. The first turntable and the second turntable are coaxially arranged and can rotate synchronously.

3. The air intake device according to claim 1, characterized in that, The fan assembly includes a guide (4), and an annular gap (401) is formed between the guide (4) and the inner wall surface of the air outlet (3022).

4. The air inlet device according to claim 3, characterized in that, The guide (4) is a conical block, and the fan assembly also includes an axial fan (5), which is disposed between the conical block and the first conversion component (301), with the small end of the conical block facing the axial fan (5).

5. A fresh air air conditioner, characterized in that, Includes an indoor unit (1) and an air intake device as described in any one of claims 1-4, wherein the indoor unit (1) is provided with an air inlet (101).

6. A control method for a fresh air air conditioner, characterized in that, The control method is used to control the fresh air air conditioner according to claim 5; The control method includes: detecting the cleanliness of the fresh air duct (2), determining whether the fresh air duct (2) needs to be cleaned based on the cleanliness, and controlling the first conversion component (301) to be in the cleaning working position when the fresh air duct (2) needs to be cleaned.

7. The control method for a fresh air air conditioner according to claim 6, characterized in that, The fresh air air conditioner is equipped with a first particle detection device and a second particle detection device. The first particle detection device is used to detect the particle concentration N1 at the fresh air outlet, and the second particle detection device is used to detect the particle concentration N2 at the fresh air inlet. Detecting the cleanliness of the fresh air duct (2) includes: obtaining the particle concentration N1 at the fresh air outlet and the particle concentration N2 at the fresh air inlet, and comparing N1 / N2 with a preset ratio.

8. The control method for a fresh air air conditioner according to claim 7, characterized in that, The fresh air duct (2) needs to be cleaned, including sending a prompt message to the user for a preset duration when N1 / N2 is greater than or equal to a preset ratio, and the first conversion component (301) is in the cleaning working position if the user does not perform any operation within the preset duration, or the user issues a command to clean the fresh air duct (2) within the preset duration.

9. The control method for a fresh air air conditioner according to any one of claims 6-8, characterized in that, The first conversion component (301) is provided with a blocking part. When the first conversion component (301) is working, the blocking part can block the air inlet (101). The fresh air air conditioner has a fresh air mode. When the fresh air conditioner receives an instruction to execute the fresh air mode, it first executes the control method and then controls the first conversion component (301) to be in the fresh air working position; and / or, when the fresh air conditioner receives an instruction to end the fresh air mode, it first executes the control method and then controls the blocking part of the first conversion component (301) to block the air inlet (101).

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