Fresh air conditioner and control method

Abstract

The invention relates to a fresh air conditioner and a control method. The fresh air conditioner comprises a machine shell, a fresh air fan and a double-layer reversing noise reduction structure. A fresh air channel is formed in the machine shell. The fresh air fan is arranged in the fresh air duct; the double-layer reversing noise reduction structure is arranged at the outlet end of the fresh air duct and comprises a reversing air door. Wherein the reversing air door is configured to have a first state and a second state; in the first state, the fresh air duct communicates with a first air outlet formed in the top of the machine shell through the reversing air door, so that a first air supply path is formed; in the second state, the fresh air duct communicates with a second air outlet formed in the side face of the machine shell through the reversing air door, so that a second air supply path is formed; the length of the second air supply path is larger than that of the first air supply path, and at least part of the section of the second air supply path is provided with a noise reduction structure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of fresh air air conditioners, and in particular, to a fresh air air conditioner and a control method. BACKGROUND

[0002] With the increasing demand for indoor air quality and environmental comfort, air conditioners with fresh air function (i.e., "fresh air air conditioners") are increasingly favored by the market. Fresh air air conditioners can introduce outdoor fresh air into the room, effectively diluting the concentration of indoor carbon dioxide, volatile organic compounds and other pollutants, thereby improving the air environment in the closed room.

[0003] However, the existing fresh air air conditioners still have obvious deficiencies in structural design and control logic, mainly manifested in the following two aspects: First, while pursuing a large amount of fresh air, noise control is often overlooked. Some manufacturers tend to use the simple way of increasing the speed of the fresh air fan to achieve the advertised fresh air volume, but this will directly lead to a significant increase in operating noise. In addition, the position design of the fresh air outlet also affects the noise and mixing effect. If the fresh air outlet is set at the top of the air conditioner near the air inlet, although the air resistance is small and the energy consumption is low, when the air conditioner is running at high wind volume, the fresh air flow is easily constrained and reflected by the air duct structure and the top wall, generating and amplifying noise; if the fresh air outlet is set at the front panel of the air conditioner, aiming to mix with the air outlet of the air conditioner, it may cause uneven temperature of the supply air or poor diffusion effect of the fresh air, affecting the user experience.

[0004] Second, under the condition that the indoor and outdoor temperature difference is large, the introduction of fresh air will cause impact on the indoor temperature balance. Fresh air itself carries outdoor temperature, and when a large amount of fresh air is needed to quickly improve air quality, a large amount of fresh air without temperature regulation or insufficient temperature regulation enters the room, which will inevitably interfere with the established indoor temperature field of the air conditioner, causing obvious fluctuations in room temperature, affecting comfort and increasing the regulation load of the air conditioning system.

[0005] In summary, the existing fresh air air conditioner cannot well balance the low noise operation and the reasonable optimization of the supply air path under the demand of large air volume, and also lacks an effective compensation mechanism for the temperature disturbance caused by the introduction of fresh air in the control, resulting in the sacrifice of noise comfort and temperature stability while improving air quality.

[0006] Therefore, there is an urgent need for a fresh air air conditioner scheme that can comprehensively improve fresh air noise, optimize the supply air path, and intelligently maintain the stability of indoor temperature. SUMMARY

[0007] The present disclosure provides a fresh air air conditioner and a control method to solve the technical problems of the prior art that have unreasonable fresh air noise and supply air path.

[0008] The fresh air conditioner provided by the embodiments of the present disclosure comprises: a shell, a fresh air fan and a double-layer reversing sound insulation structure, the shell is internally provided with a fresh air duct; the fresh air fan is arranged in the fresh air duct; the double-layer reversing sound insulation structure is arranged at an outlet end of the fresh air duct, and the double-layer reversing sound insulation structure comprises a reversing damper; wherein the reversing damper is configured to have a first state and a second state; in the first state, the fresh air duct is communicated with a first air outlet arranged at the top of the shell through the reversing damper to form a first air supply path; in the second state, the fresh air duct is communicated with a second air outlet arranged at the side of the shell through the reversing damper to form a second air supply path; the length of the second air supply path is greater than the length of the first air supply path, and at least a part of a section of the second air supply path is provided with a sound insulation structure.

[0009] The sound insulation structure is a porous sound insulation structure arranged on a channel wall surface of the second air supply path.

[0010] The fresh air conditioner further comprises: an air volume sensor arranged in the fresh air duct, used for detecting a fresh air volume; a temperature sensor arranged at a fresh air inlet of the fresh air duct or in the fresh air duct, used for detecting a fresh air temperature; a control module electrically connected with the air volume sensor, the temperature sensor, the fresh air fan and the reversing damper; The control module is configured to: control the reversing damper to switch between the first state and the second state according to the fresh air volume detected by the air volume sensor.

[0011] The control module is configured to: calculate a change amount of indoor heat load caused by introduced fresh air according to the fresh air volume and the fresh air temperature; adjust an operation frequency of a compressor of the fresh air conditioner according to the change amount of indoor heat load.

[0012] The fresh air conditioner further comprises: a person perception sensor arranged on the shell, used for detecting whether there is a person in the room; The control module is electrically connected with the person perception sensor and is configured to: control the reversing damper to switch to the second state when the fresh air volume is greater than a first threshold value and the person perception sensor detects that there is a person in the room.

[0013] The control module is further configured to: When the fresh air volume is greater than the first threshold and the personnel sensing sensor detects that no one is in the room, the reversing damper is controlled to switch to the first state.

[0014] The fresh air conditioner also includes an indoor air quality sensor. The control module is electrically connected to the indoor air quality sensor and is configured to adjust the speed of the fresh air fan according to the detection data of the indoor air quality sensor.

[0015] The fresh air inlet of the fresh air duct is connected to an outdoor air intake component, which includes a rainproof connector and an air intake grille installed on the inner circumference of the rainproof connector; the rainproof connector has a cage-like structure; and the air intake grille is an injection-molded part.

[0016] This disclosure also provides a control method applied to the aforementioned fresh air conditioning system, the control method comprising: Acquisition Steps: Acquire the current fresh air volume of the fresh air conditioner; Judgment steps: Determine whether the current fresh air volume is greater than the preset air volume threshold; Control steps: Based on the result of the judgment steps, control the switching state of the reversing damper; The reversing damper is configured to have a first state and a second state; In the first state, the fresh air duct is connected to the first air outlet located on the top of the casing through the reversing damper to form a first air supply path; In the second state, the fresh air duct is connected to the second air outlet located on the side of the casing through the reversing damper to form a second air supply path; The length of the second air supply path is greater than the length of the first air supply path, and at least a portion of the second air supply path is provided with a sound-absorbing structure.

[0017] The control steps include: If the current fresh air volume is greater than the preset air volume threshold, the reversing damper is controlled to switch to the second state, so that the fresh air is sent out through the second air supply path; If the current fresh air volume is less than or equal to the preset air volume threshold, the reversing damper is controlled to switch to the first state, so that the fresh air is sent out through the first air supply path.

[0018] The acquisition step further includes: Obtain the fresh air temperature; The control method further includes: Calculation steps: Based on the current fresh air volume and the fresh air temperature, calculate the change in indoor heat load caused by the introduction of fresh air; Adjustment steps: Adjust the operating frequency of the compressor of the fresh air conditioner according to the change in heat load.

[0019] In the calculation steps: When the absolute value of the heat load change is greater than the first heat threshold, the adjustment step is executed to adjust the compressor frequency; When the absolute value of the change in heat load is less than or equal to the first heat threshold, the current operating frequency of the compressor is maintained.

[0020] In the determination step, the preset air volume threshold includes a first air volume threshold and a second air volume threshold, wherein the first air volume threshold is less than the second air volume threshold. The control steps include: If the current fresh air volume is greater than the second air volume threshold, then control the reversing damper to switch to the second state; If the current fresh air volume is greater than the first air volume threshold and less than or equal to the second air volume threshold, then the reversing damper is controlled according to the presence status of the people in the room.

[0021] The acquisition step further includes: The presence status of people indoors is obtained through personnel perception sensors; In the control step, controlling the reversing damper based on the presence status of the indoor occupants includes: When someone is inside, control the reversing damper to switch to the second state; When no one is in the room, the reversing damper is switched to the first state.

[0022] The acquisition step further includes: Indoor air quality data is obtained through indoor air quality sensors; The control method further includes: Airflow adjustment steps: Based on the indoor air quality data, adjust the speed of the fresh air fan to change the current fresh air volume.

[0023] In the air volume adjustment step: The required fresh air volume is calculated based on the indoor air quality data. The speed of the fresh air fan is adjusted according to the difference between the required fresh air volume and the current fresh air volume.

[0024] The technical solutions provided in this disclosure have the following advantages compared with the prior art: The fresh air conditioning system and control method disclosed in this embodiment utilize a double-layer reversing and noise-reducing structure with a reversing damper at the outlet of the fresh air duct, allowing the fresh air to select different delivery paths according to demand. When the reversing damper is in the first state, the fresh air is delivered directly from the top of the casing via a shorter path, resulting in low wind resistance and low fan energy consumption. When the reversing damper switches to the second state, the fresh air is redirected to the side of the casing, a longer path with a dedicated noise-reducing structure, thus more effectively reducing airflow noise. The technical effect is that, through differentiated path design, energy saving is achieved while noise reduction is optimized for both low airflow demand and high airflow demand. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0028] Figure 1 This is a schematic diagram of the double-layer reversing noise reduction structure installed in the fresh air fan of the fresh air conditioner provided in this embodiment of the disclosure; Figure 2 This is a half-section structural diagram of the double-layer reversing noise reduction structure in the fresh air conditioner provided in this embodiment of the disclosure; Figure 3 This is a schematic diagram of the axonometric structure of the double-layer reversing noise reduction structure in the fresh air conditioning system provided in this embodiment of the disclosure; Figure 4 This is a schematic diagram of the axial structure of the rainproof connector in the fresh air conditioner provided in this embodiment of the disclosure; Figure 5 This is a schematic diagram of the axial structure of the air intake grille in a fresh air conditioning system provided in an embodiment of this disclosure.

[0029] Explanation of reference numerals in the attached figures: 1. Fresh air fan; 2. Double-layer reversing and noise reduction structure; 21. Reversing damper; 22. First air outlet; 23. Second air outlet; 24. Noise reduction structure; 25. Air volume sensor; 26. Temperature sensor; 27. Fresh air inlet; 28. Rainproof connector; 29. ​​Damper motor; 30. Air inlet grille. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0031] refer to Figures 1-5 The fresh air conditioner provided in this embodiment includes: a casing, a fresh air fan 1, and a double-layer reversing silencing structure 2. The casing is provided with a fresh air duct. The fresh air fan 1 is disposed in the fresh air duct. The double-layer reversing silencing structure 2 is disposed at the outlet end of the fresh air duct. The double-layer reversing silencing structure 2 includes a reversing damper 21. The reversing damper 21 is configured to have a first state and a second state. In the first state, the fresh air duct is connected to a first air outlet 22 disposed on the top of the casing through the reversing damper 21 to form a first air supply path. In the second state, the fresh air duct is connected to a second air outlet 23 disposed on the side of the casing through the reversing damper 21 to form a second air supply path. The length of the second air supply path is greater than the length of the first air supply path, and at least a portion of the second air supply path is provided with a silencing structure 24.

[0032] By installing a double-layer reversing and noise-reducing structure 2 with a reversing damper 21 at the outlet of the air conditioning fresh air duct, the fresh air can choose different delivery paths according to demand. When the reversing damper 21 is in the first state, the fresh air is delivered directly from the top of the casing via a shorter path, resulting in low wind resistance and low fan energy consumption. When the reversing damper 21 switches to the second state, the fresh air is diverted to the side of the casing, resulting in a longer path with a dedicated noise-reducing structure 24, which more effectively reduces airflow noise. The technical effect is that, through differentiated path settings, energy saving is achieved while noise reduction is optimized for both low airflow demands and high airflow demands.

[0033] For example, the silencing structure 24 is a common device for reducing airflow noise. For instance, it may be a liner or module made of porous sound-absorbing material, the specific shape and material of which can be selected and set according to the noise reduction requirements.

[0034] For example, the double-layer reversing silencing structure 2 mainly describes its structural hierarchy. It can be understood that the structure has an outer shell and an inner air duct or guide component. The reversing damper 21 is usually set in the inner layer to realize the switching and guiding of fresh air between two different outlet directions.

[0035] For example, the double-layer reversing noise reduction structure 2 also includes a damper motor 29. The output end of the damper motor 29 is connected to a rotating shaft. The rotating shaft is used to drive the top of the reversing damper 21 to rotate, so as to control the opening and closing of the reversing damper 21 during the forward or reverse rotation of the rotating shaft.

[0036] Specifically, when the fresh air fan 1 starts, it draws outdoor air into the fresh air duct. The control system determines the required fresh air volume level based on indoor air quality or user settings. When a smaller fresh air volume is needed, the control damper 21 switches to the first state, and the fresh air is quickly blown out from the top of the casing along the first air supply path. Although the noise reduction effect is limited at this time, the overall noise and energy consumption are controllable due to the small air volume and short path. When a larger fresh air volume is needed, the control damper 21 switches to the second state, and the fresh air enters the second air supply path. This longer path allows the airflow to diffuse and slow down. At the same time, the noise reduction structure 24 in the path actively absorbs sound energy, thereby significantly reducing the noise generated by the high-speed, high-volume airflow. Then, the fresh air is delivered from the side of the casing. Through this switchable dual-path setting, a balanced management of noise and energy consumption under different operating conditions is achieved.

[0037] In some embodiments, the silencing structure 24 is a porous silencing structure 24, which is disposed on the channel wall of the second air supply path.

[0038] For example, the porous sound-absorbing structure 24 refers to a sound-absorbing component made of a material filled with interconnected tiny pores, such as common sound-absorbing cotton or sintered porous materials. Placing it on the channel wall means that the structure acts as a lining or component of the duct's inner wall, allowing the flowing air to directly contact its porous surface, thereby achieving optimal sound absorption and noise reduction.

[0039] By defining the silencing structure 24 as a porous silencing structure 24 disposed on the wall of the second air supply path channel, the technical effect is that when the fresh air flows along the longer second air supply path, the airflow comes into full contact with the large-area porous structure on the channel wall. The sound energy is efficiently absorbed and dissipated in the micropores of the porous material through friction and viscosity. Thus, based on the extended path, the attenuation capability of airflow noise under high air volume conditions is further enhanced, achieving a more significant active noise reduction effect.

[0040] Specifically, when the system determines that a large volume of fresh air is needed and controls the reversing damper 21 to switch to the second state, the fresh airflow enters the second air supply path. When the airflow passes through the channel of this path, the broadband noise generated by the airflow will be incident on the porous sound-absorbing structure 24 on the channel wall. The sound waves enter the tortuous pores inside the material, and their vibration energy is continuously consumed by the friction and heat conduction between the air molecules and the pore walls, and is converted into a small amount of heat energy, thereby significantly reducing the noise level of the fresh airflow exiting the channel. This process, combined with the relatively long travel of the second air supply path itself, jointly achieves the goal of low-noise air supply.

[0041] In some implementations, the fresh air conditioning system also includes: The air volume sensor 25 is installed in the fresh air duct to detect the fresh air volume; Temperature sensor 26 is installed at the fresh air inlet 27 of the fresh air duct or inside the fresh air duct to detect the fresh air temperature; The control module is electrically connected to the air volume sensor 25, the temperature sensor 26, the fresh air fan 1, and the reversing damper 21. The control module is configured as follows: The fresh air volume detected by the air volume sensor 25 controls the reversing damper 21 to switch between the first state and the second state.

[0042] In this way, by adding an air volume sensor 25 and a control module, intelligent and automated control of the fresh air supply path is achieved. The technical effect is that it can automatically and accurately switch the state of the reversing damper 21 according to the real-time detected fresh air volume, so as to adaptively select the best air supply path under different air volume requirements. This reduces fan energy consumption by supplying air through a short path when the air volume is small, and effectively suppresses operating noise by supplying air through a long path combined with the silencing structure 24 when the air volume is large, thus achieving a dynamic optimization balance between energy efficiency and quietness.

[0043] The airflow sensor 25 is installed inside the fresh air duct to directly detect the airflow through the duct. The temperature sensor 26 is installed in the fresh air inlet 27 or inside the duct to monitor the temperature parameters of the introduced air. The control module, as the core processing unit, is electrically connected to these sensors, the fresh air fan 1, and the actuator of the reversing damper 21.

[0044] During system operation, the control module continuously reads the signal from the airflow sensor 25 to obtain the current fresh air volume. When the airflow is determined to be below a preset threshold, corresponding to a small airflow demand, the reversing damper 21 is switched to the first state, allowing fresh air to be delivered directly from the top of the casing via the first air supply path. This path is short and has low airflow resistance, which is beneficial for the low-power operation of the fan. When the airflow is determined to be above the preset threshold, corresponding to a large airflow demand, the reversing damper 21 is switched to the second state, allowing fresh air to be delivered from the side of the casing via the second air supply path. This path is longer and has a porous sound-absorbing structure 24 on its channel wall, which can fully absorb and attenuate the sound energy of the high-speed airflow, thereby achieving low-noise output under large airflow. The entire control process automatically makes decisions based on the key parameter of airflow, ensuring that the air supply mode always matches the actual demand.

[0045] In some implementations, the control module is configured as follows: Calculate the change in indoor heat load caused by the introduction of fresh air based on the fresh air volume and fresh air temperature; Adjust the operating frequency of the compressor in the fresh air conditioner according to the changes in heat load.

[0046] In this way, the control module calculates the change in indoor heat load caused by the introduction of outdoor fresh air by collecting two parameters in real time: fresh air volume and fresh air temperature, and dynamically adjusts the operating frequency of the air conditioner compressor accordingly. The technical effect is that it can actively compensate for indoor temperature fluctuations caused by the introduction of outdoor fresh air at different temperatures. Regardless of whether the fresh air is cold or hot, the system can quickly offset its impact by adjusting the cooling or heating capacity, thereby ensuring a highly stable and comfortable indoor temperature environment while improving air quality by introducing fresh air.

[0047] For example, heat load change is a parameter characterizing energy change. In this scheme, it specifically refers to the amount of additional cooling or heating capacity required to maintain the set indoor temperature due to the introduction of outdoor fresh air with a specific temperature per unit time. Its calculation basis usually involves the fresh air volume, the temperature difference between the fresh air and the target indoor temperature.

[0048] First, the control module acquires real-time fresh air volume data from the air volume sensor 25 and real-time fresh air temperature data from the temperature sensor 26. Next, the control module compares the fresh air temperature with the set indoor temperature or the measured return air temperature to determine the temperature difference. Combining this with the fresh air volume, it uses a built-in algorithm model to calculate the change in heat load caused by the introduced fresh air, i.e., the amount of heat or cooling that needs to be compensated. Then, the control module compares this heat load change with a preset threshold. If the calculated heat load change is small and within an acceptable range, the control module maintains the compressor's current operating frequency. If the heat load change exceeds the preset threshold, indicating that the fresh air is significantly interfering with the indoor temperature balance, the control module generates a control command to increase or decrease the compressor's operating frequency, thereby enhancing or weakening the overall cooling or heating capacity of the air conditioning system. This accurately and promptly offsets the temperature impact of the introduced fresh air, allowing the indoor temperature to quickly recover and remain stable.

[0049] In some implementations, the fresh air conditioning system also includes: A personnel detection sensor, mounted on the casing, is used to detect whether there are people inside the room; The control module is electrically connected to the personnel sensing sensor and is configured as follows: When the fresh air volume is greater than the first threshold and the personnel sensing sensor detects that someone is indoors, the control reversing damper 21 is switched to the second state.

[0050] By incorporating the presence of people indoors into the automatic decision-making logic of the fresh air supply path, the technical effect is to achieve more humanized and targeted noise management. When the system requires a large volume of fresh air and people are present, priority is given to ensuring the quiet comfort of the activity area. This is achieved by actively reducing supply noise by forcibly activating the second air supply path with a sound-absorbing structure 24. When no one is present, the system may be allowed to adopt other path strategies for energy saving.

[0051] For example, a human presence sensor is a detection device capable of detecting the presence of a human body indoors. For instance, a millimeter-wave radar sensor can be used, mounted on the air conditioner casing, to non-contactly detect human activity signals within a certain range. The first threshold is a preset fresh air volume threshold used to distinguish whether the current operating condition is one of high air volume demand.

[0052] Specifically, the control module continuously receives real-time fresh air volume data from the air volume sensor 25, and simultaneously receives indoor occupant presence signals from the occupant perception sensor. The control module compares the detected fresh air volume with a preset first threshold. When both conditions are met simultaneously—that is, the fresh air volume is greater than the first threshold and the occupant perception sensor clearly detects the presence of occupants indoors—the control module determines that the current condition requires high air volume and that occupant comfort must be prioritized. Based on this determination, the control module generates a control command to drive the reversing damper 21 to switch to the second state. At this time, the fresh air will flow through a longer second air supply path. The channel wall of this path is equipped with a porous sound-absorbing structure 24, which effectively absorbs and attenuates noise from the high-speed airflow, ultimately delivering a large volume of low-noise fresh air from the side of the casing, avoiding noise interference to occupants while rapidly exchanging air. If either the air volume condition or the occupant status is not met, the control module can maintain the current state or select a path based on other logic.

[0053] In some implementations, the control module is also configured to: When the fresh air volume is greater than the first threshold and the personnel perception sensor detects that no one is in the room, the control reversing damper 21 is switched to the first state.

[0054] In this way, the system energy efficiency is optimized in unmanned scenarios. The technical effect is that when the room is unmanned and a large amount of fresh air is required, the system automatically selects the short-path air supply mode with lower wind resistance, thereby effectively reducing the operating energy consumption of the fresh air fan 1 while meeting the needs of rapid ventilation, and achieving energy-saving operation.

[0055] Specifically, the control module simultaneously receives real-time fresh air volume signals from the air volume sensor 25 and indoor occupancy status signals from the personnel perception sensor. The control module compares the fresh air volume with a preset first threshold, which is used to define high air volume demand conditions. When the control module simultaneously determines that the fresh air volume is greater than the first threshold and the personnel perception sensor detects that no one is in the room, the control module generates a corresponding control command. This command drives the reversing damper 21 to switch to the first state. In this state, the fresh air duct connects to the first air outlet 22 located on the top of the casing through the reversing damper 21, forming the first air supply path. Because this path is short and direct with low airflow resistance, even under high air volume operating conditions, the fresh air fan 1 can achieve air supply with relatively low power consumption, thereby saving energy. This control logic ensures that in unoccupied environments where noise experience for personnel is not a priority, the system can automatically adopt the most economical operating mode.

[0056] In some implementations, the fresh air conditioner also includes an indoor air quality sensor, the control module is electrically connected to the indoor air quality sensor, and is configured to adjust the speed of the fresh air fan 1 according to the detection data of the indoor air quality sensor.

[0057] By introducing indoor air quality sensors, the fresh air system gains the ability to perceive and adjust indoor pollution levels in real time, achieving precise, on-demand supply of fresh air. The system automatically adjusts the speed of the fresh air fan based on the actual indoor air quality level, increasing the air exchange rate for rapid purification when air quality is poor and decreasing it to save energy when air quality is good. This optimizes overall operational efficiency while ensuring a healthy breathing environment.

[0058] For example, an indoor air quality sensor is a device used to detect the concentration of a specific parameter characterizing indoor air cleanliness, such as sensing elements for detecting oxygen content, carbon dioxide content, or PM2.5 concentration. Its detection data serves as a direct indicator of the degree of indoor air pollution.

[0059] Specifically, the control module continuously receives real-time detection data from indoor air quality sensors. The control module has preset health thresholds or comfort ranges for key pollutant concentrations. It compares and judges the real-time data detected by the sensors with these preset thresholds. If the data indicates poor indoor air quality, such as excessive PM2.5 concentration or high carbon dioxide concentration, the control module determines that the fresh air exchange needs to be increased. It then generates a control command to increase the operating speed of the fresh air fan 1, thereby increasing the amount of outdoor fresh air introduced per unit time and accelerating the dilution and removal of indoor pollutants. Conversely, if the sensor data shows that indoor air quality has recovered or remained at a good level, the control module generates a command to reduce the speed of the fresh air fan 1, reducing the amount of fresh air and lowering fan energy consumption. This closed-loop control process achieves dynamic matching and intelligent adjustment between fresh air supply and indoor air quality.

[0060] In some embodiments, the fresh air inlet 27 of the fresh air duct is connected to an outdoor air intake component, which includes a rainproof connector 28 and an air intake grille 30 installed on the inner periphery of the rainproof connector 28; the rainproof connector 28 has a cage-like structure; and the air intake grille 30 is an injection-molded part.

[0061] In this way, the specialized structural optimization of the outdoor air inlet of the fresh air system has a dual technical effect: the cage-like rainproof connector 28 can effectively prevent rainwater from directly entering the air duct, while its multi-faceted open structure maximizes the effective ventilation area of ​​the air inlet and reduces air resistance, thereby helping to increase the fresh air volume; while the air inlet grille 30, manufactured by injection molding, facilitates the mass production of complex and regular grid shapes, ensuring that larger foreign objects such as outdoor leaves and flying insects are effectively blocked from entering, while also having the advantages of structural strength and controllable production costs.

[0062] For example, a cage structure typically refers to a three-dimensional frame structure with openings in multiple directions, formed by rod-shaped or sheet-like components. Its shape resembles a birdcage, achieving a balance between rain protection and ventilation. Injection molding is a processing method that involves injecting molten plastic into a mold cavity, which then cools and solidifies to obtain a plastic product. It is suitable for mass production of parts with fine grid structures, such as the air intake grille 30.

[0063] Specifically, fresh outdoor air first enters the system through the outdoor air intake assembly. The cage-type rainproof connector 28, as the outermost first layer of protection, has a protruding cage-like structure that physically blocks falling rainwater, allowing it to slide off the outer surface of the structure, while air is drawn in through openings on its sides and sides. Subsequently, the air flows through the air intake grille 30 installed inside or at the rear of the rainproof connector 28. This injection-molded grille is densely covered with grids or meshes of specific sizes, which can mechanically intercept debris larger than the aperture, such as leaves, pieces of paper, or insects, preventing them from entering the fresh air duct and thus protecting subsequent components such as the fresh air fan 1. The entire assembly, while ensuring smooth air intake and basic protection functions, achieves performance and cost optimization through specific structural design and manufacturing processes.

[0064] This disclosure also provides a control method applied to the aforementioned fresh air conditioning system, the control method including: Steps to obtain the current fresh air volume of the fresh air conditioner; Judgment steps: Determine whether the current fresh air volume is greater than the preset air volume threshold; Control steps: Based on the result of the judgment step, control the switching state of the reversing damper 21; The reversing damper 21 is configured to have a first state and a second state. In the first state, the fresh air duct is connected to the first air outlet 22 located on the top of the casing through the reversing damper 21 to form a first air supply path. In the second state, the fresh air duct is connected to the second air outlet 23 located on the side of the casing through the reversing damper 21 to form a second air supply path. The length of the second air supply path is greater than the length of the first air supply path, and at least a portion of the second air supply path is provided with a sound-absorbing structure 24.

[0065] If the current fresh air volume is greater than the preset air volume threshold, the reversing damper 21 is controlled to switch to the second state, so that the fresh air is sent out through the second air supply path; If the current fresh air volume is less than or equal to the preset air volume threshold, the reversing damper 21 is controlled to switch to the first state, so that the fresh air is sent out through the first air supply path.

[0066] In this way, a decision-making logic based on real-time air volume detection and fixed threshold comparison is established to automatically control the switching of fresh air supply paths. The technical effect is that the fresh air air conditioner can automatically select the best air supply mode according to the actual operating air volume. When the air volume is large, a long path with noise reduction function is used to reduce noise, and when the air volume is small, a short path is used to reduce energy consumption, thereby achieving intelligent management of noise and energy efficiency.

[0067] For example, the preset air volume threshold is a critical air volume value pre-stored in the control system, used as a benchmark to determine whether the current operating condition is high or low air volume. Its specific value can be set according to the model, noise standard and energy efficiency target.

[0068] First, during the acquisition step, the system detects and acquires the current actual fresh air volume data through the air volume sensor 25 installed in the fresh air duct. Next, in the judgment step, the control module compares the acquired current fresh air volume with an internally preset air volume threshold. Then, in the control step, the control module outputs corresponding control commands based on the comparison result. If the comparison result indicates that the current fresh air volume is greater than the preset air volume threshold, the control module drives the reversing damper 21 to switch to the second state. In this state, the fresh air duct connects to the second air outlet 23 on the side of the casing through the reversing damper 21, and the fresh air flows through a longer section. The second air supply path has a porous sound-absorbing structure 24 on its channel wall to effectively reduce noise from large airflows. Fresh air is then delivered from the side. If the comparison result shows that the current fresh air volume is less than or equal to the preset air volume threshold, the control module drives the reversing damper 21 to switch to the first state. In this state, the fresh air duct is connected to the first air outlet 22 on the top of the casing through the reversing damper 21, and the fresh air is directly delivered through the shorter first air supply path. Due to the short path and low wind resistance, the fan can operate at a lower power consumption. The entire method achieves automatic matching of air supply mode and air volume demand through a simple "detection, judgment, and execution" closed loop.

[0069] In some implementations, the acquisition step further includes: Obtain the fresh air temperature; Control methods also include: Calculation steps: Based on the current fresh air volume and fresh air temperature, calculate the change in indoor heat load caused by the introduction of fresh air; Adjustment steps: Adjust the operating frequency of the compressor of the fresh air conditioner according to the change in heat load.

[0070] In this way, the fresh air temperature parameter is incorporated into the control logic. By simultaneously monitoring the fresh air volume and temperature, its disturbance to the indoor thermal environment is quantified, and the output of the core cooling and heating components of the air conditioner is actively adjusted accordingly. The technical effect is to achieve active compensation and dynamic offsetting of the impact of fresh air temperature. In the process of introducing fresh air to improve air quality, it can effectively suppress indoor temperature fluctuations and significantly improve the temperature stability and comfort of the indoor environment.

[0071] For example, the change in indoor heat load caused by the introduction of fresh air is a calculated parameter that reflects the amount of sensible heat (cooling or heating) brought into the room by the fresh air per unit time. Its calculation is based on the detected fresh air volume, the temperature difference between the fresh air temperature and the set indoor temperature or the current room temperature, and takes into account physical properties such as the specific heat capacity of the air.

[0072] Specifically, in the acquisition step, the system not only acquires the current fresh air volume through the air volume sensor 25, but also acquires the current fresh air temperature through the temperature sensor 26 located at the fresh air inlet 27 or in the air duct. Subsequently, in the calculation step, the control module compares the fresh air temperature with the indoor target temperature to obtain the temperature difference, and, by combining the fresh air volume data and using a built-in physical model or empirical formula, calculates the change in heat load caused by the current introduction of fresh air, i.e., the cooling or heating power that needs to be compensated. Finally, in the adjustment step, the control module compares the calculated change in heat load with a preset compensation threshold. If the change in heat load is small and does not exceed the threshold, the current operating frequency of the compressor remains unchanged. If the change in heat load is significant and exceeds the threshold, the control module generates a control command to increase or decrease the operating frequency of the compressor accordingly. The change in compressor frequency directly changes the circulation volume and heat exchange capacity of the refrigerant in the air conditioning system, thereby accurately matching the output cooling or heating capacity with the additional heat load brought in by the fresh air, promptly offsetting the impact of the fresh air on the room temperature, and allowing the indoor temperature to quickly recover and stabilize near the set value.

[0073] In some implementations, during the calculation step: When the absolute value of the change in heat load is greater than the first heat threshold, an adjustment step is executed to adjust the compressor frequency. When the absolute value of the change in heat load is less than or equal to the first heat threshold, maintain the current operating frequency of the compressor.

[0074] This introduces a threshold for compressor frequency regulation based on the absolute value of heat load change, which enables more precise and economical temperature compensation control. By setting a first heat threshold, the system can effectively distinguish between significant thermal disturbances and minor thermal fluctuations, activating the compressor for active compensation only when the former occurs, and maintaining the compressor's current state when the latter occurs. This avoids unnecessary frequent adjustments or power fluctuations in the compressor due to minor, instantaneous temperature disturbances, which helps maintain system stability and energy efficiency, and also ensures timely action when it is truly necessary to offset the significant thermal impact of fresh air.

[0075] For example, the first heat threshold is a preset absolute value of the heat load change that serves as a criterion for judgment. This threshold represents the maximum range of indoor heat load fluctuations that the system allows without additional compensation from the compressor, and its specific value can be determined comprehensively based on the room's thermal insulation characteristics, comfort requirements, and system adjustment accuracy.

[0076] Specifically, in the calculation step, the control module processes the data of the fresh air volume and temperature, calculating the change in indoor heat load caused by the introduction of fresh air. This value may be positive or negative, representing whether the introduced heat load or cooling load is heat load or cooling load, respectively. Subsequently, the control module takes the absolute value of the heat load change and compares it with a preset first heat threshold. If the absolute value is greater than the first heat threshold, it indicates that the degree of heat or cold interference brought by the introduction of fresh air has exceeded the system's preset tolerance range, and intervention is necessary. At this time, the control module executes the adjustment step, increasing or decreasing the compressor's operating frequency accordingly based on the sign and magnitude of the heat load change, in order to output additional cooling or heating to precisely offset the interference. If the absolute value is less than or equal to the first heat threshold, it indicates that the heat load change caused by the current fresh air is very small and within an acceptable fluctuation range. The control module determines that there is no need to activate the compensation mechanism, and therefore maintains the current operating frequency of the compressor, allowing the system to continue operating in a more energy-efficient state.

[0077] In some implementations, in the determination step, the preset air volume threshold includes a first air volume threshold and a second air volume threshold, wherein the first air volume threshold is less than the second air volume threshold. The control steps include: If the current fresh air volume is greater than the second air volume threshold, control the reversing damper 21 to switch to the second state; If the current fresh air volume is greater than the first air volume threshold and less than or equal to the second air volume threshold, then the reversing damper 21 is controlled according to the presence of people in the room.

[0078] The acquisition steps also include: The presence status of people indoors is obtained through personnel perception sensors; In the control step, controlling the reversing damper 21 based on the presence status of the indoor occupants includes: When someone is inside, control the reversing damper 21 to switch to the second state; When no one is in the room, control the reversing damper 21 to switch to the first state.

[0079] This approach constructs a dual-judgment logic that combines airflow classification with personnel status to achieve more refined and scenario-based control of the air delivery path. The technical effect is that when the airflow is in the middle range—higher but not at its maximum—the presence of personnel is used as a key decision-making criterion. This allows for an intelligent trade-off between prioritizing quiet comfort in occupied environments and prioritizing operational economy in unoccupied environments, making system control more human-centered and energy-efficient.

[0080] For example, the first airflow threshold and the second airflow threshold are two preset airflow cutoff values ​​with different values, which together divide the airflow range into three intervals: low, medium, and high. The first airflow threshold has a smaller value and is used to define the boundary between low and medium airflow; the second airflow threshold has a larger value and is used to define the boundary between medium and high airflow. The indoor occupant presence status refers to the binary signal detected by the occupant perception sensor that indicates whether or not occupants are currently present in the room.

[0081] Specifically, in the acquisition step, the system simultaneously acquires the current fresh air volume and the presence status of indoor occupants detected by the personnel perception sensor; in the judgment and control step, the control module compares the current fresh air volume with the preset second air volume threshold and the first air volume threshold sequentially; if the current fresh air volume is greater than the second air volume threshold, i.e., it is in the high air volume range, then regardless of the occupant status, the control module controls the reversing damper 21 to switch to the second state, activating the second air supply path with the silencing structure 24 to cope with the high noise that will inevitably be generated by the high air volume; if the current fresh air volume is greater than the first air volume threshold but less than the second air volume threshold, the system will proceed as follows: If the air volume is equal to or equal to the second air volume threshold, i.e., in the medium air volume range, the control module further checks the presence status of personnel. When it is determined that there are people in the room, in order to prioritize the quiet comfort of the personnel activity area, the reversing damper 21 is controlled to switch to the second state. When it is determined that there are no people in the room, energy saving is prioritized, and the reversing damper 21 is controlled to switch to the first state, so as to reduce the energy consumption of the fan by supplying air through a shorter path. If the air volume is less than or equal to the first air volume threshold, i.e., in the low air volume range, the reversing damper 21 is usually controlled to switch to the first state according to the basic logic. Through this hierarchical judgment mechanism, the system realizes the optimized selection of the air supply path.

[0082] In some implementations, the acquisition step further includes: Indoor air quality data is obtained through indoor air quality sensors; Control methods also include: Air volume adjustment steps: Based on the indoor air quality data, adjust the speed of the fresh air fan 1 to change the current fresh air volume.

[0083] In this way, indoor air quality data is used as a direct feedback signal to adjust the speed of the fresh air fan 1, forming a closed-loop control. The technical effect is to achieve dynamic adaptive adjustment of fresh air volume. The system can intelligently control the ventilation intensity according to the actual pollution level of indoor air. When the air quality deteriorates, ventilation is automatically enhanced for rapid purification, and ventilation is automatically reduced to save energy when the air quality is good. Thus, the overall operating efficiency of the system is optimized while ensuring a healthy breathing environment.

[0084] For example, indoor air quality data refers to electrical signals or digital values ​​that characterize the concentration of specific pollutants, obtained in real time through indoor air quality sensors. These may include concentrations of fine particulate matter (PM2.5) and carbon dioxide (CO2). Adjusting the speed of the fresh air fan 1 to change the current fresh air volume means that the control module changes the frequency or voltage of the electrical signal driving the fresh air fan 1, thereby increasing or decreasing its impeller speed, and thus directly increasing or decreasing the volumetric airflow through the duct per unit time.

[0085] Specifically, in the acquisition step, the system continuously collects indoor air quality data through indoor air quality sensors. After receiving this data, the control module compares it in real time with the internally preset safe thresholds or comfort range standards for each pollutant concentration. In the airflow adjustment step, the control module makes a decision based on the comparison results. If the detection data indicates that the indoor air quality does not meet the standards, for example, the PM2.5 concentration exceeds the set upper limit, the control module determines that the fresh air exchange needs to be increased, and then generates a control command to increase the operating speed of the fresh air fan 1. The increase in fan speed directly leads to an increase in the current fresh air volume through the fresh air duct, thereby accelerating the introduction of outdoor fresh air to dilute and remove indoor pollutants. Conversely, if the detection data shows that the indoor air quality has recovered to a good level, the control module generates a command to reduce the speed of the fresh air fan 1, thereby reducing the fresh air volume and reducing the fan's operating energy consumption while maintaining air quality. This process constitutes a continuous monitoring, judgment, and adjustment closed loop, achieving a precise match between the fresh air supply and the indoor air cleanliness requirements.

[0086] In some implementations, during the airflow adjustment step: The required fresh air volume is calculated based on indoor air quality data. Adjust the speed of the fresh air fan 1 according to the difference between the required fresh air volume and the current fresh air volume.

[0087] Thus, a closed-loop feedback control strategy based on the deviation between the target value and the actual value is introduced to adjust the fresh air volume. The technical effect is to achieve precise and stable control of the fresh air supply. The system can dynamically calculate the theoretically required air volume based on indoor air quality and eliminate the gap between the actual and required air volume by adjusting the fan speed in real time. This allows the indoor air quality to be stably maintained at the expected level with minimal energy consumption, while avoiding abrupt changes in fan speed.

[0088] For example, the required fresh air volume is a target value calculated by an algorithm. This algorithm takes real-time indoor air quality data as its main input and its output represents the theoretical fresh air volume flow rate required to control the concentration of a specific pollutant within a set range. The fan speed is adjusted according to the difference between the required fresh air volume and the current fresh air volume. This means that the control module calculates the deviation between the target value and the measured value, and outputs the speed adjustment command proportionally or through a specific control law based on the magnitude and direction of the deviation.

[0089] Specifically, in the airflow adjustment step, the control module first inputs the acquired indoor air quality data, such as real-time PM2.5 concentration, into the built-in calculation model or queries the preset corresponding curve to calculate the fresh air volume required to achieve the set indoor air quality target, i.e., the target air volume. Then, the control module reads the current actual fresh air volume detected by the airflow sensor 25. Next, the control module calculates the difference between the required fresh air volume and the current fresh air volume. If the difference is positive, it indicates that the current actual fresh air supply is insufficient and needs to be increased. The control module then generates a control command to increase the speed of the fresh air fan 1, thereby increasing the actual air volume. If the difference is negative, it indicates that the current actual fresh air supply is excessive. The control module then generates a command to reduce the fan speed to reduce the air volume. This adjustment process continues, making the actual fresh air volume continuously approach the calculated required fresh air volume, eventually forming a stable dynamic balance, ensuring that the indoor air quality is accurately maintained within the desired range.

[0090] To better understand the solutions for the fresh air conditioning and control method provided in the embodiments of this disclosure, the following exemplary description is provided: This disclosure provides a structural design for effectively improving fresh air noise and temperature control, as well as a method for effectively stabilizing indoor temperature when fresh air is activated. The fresh air outlet is still designed at the top of the air conditioner. The fresh air outlet features a double-layer reversing silencer structure 2, with an inner layer of porous silencer structure 24 and an internal reversing damper 21. Fresh air can exit from the top and sides of the air conditioner. The top-mounted outlet has a shorter path, resulting in lower wind resistance and lower fan energy consumption, suitable for situations with low indoor fresh air volume requirements. The side-mounted outlet, due to the double-layer reversing silencer structure 2, has a longer path, effectively reducing noise and improving performance for situations with high indoor air volume requirements. Furthermore, when there is a high indoor fresh air volume requirement and a large outdoor temperature difference, a fresh air volume sensor 25 is designed to calculate and adjust the compressor operating frequency to maintain stable indoor temperature. To improve fresh air volume, an outdoor fresh air cage-type intake structure and injection-molded grilles are designed to reduce costs.

[0091] This approach can solve the problem of excessive noise from fresh air intake when there is a large demand for fresh air indoors; it can also solve the problem of excessive temperature difference between indoors and outdoors, which can disrupt the indoor temperature balance when fresh air is introduced; and it can also improve the intake air volume and keep the cost of fresh air controllable.

[0092] Specifically, a double-layer fresh air exchange mechanism is used to improve the noise of large-volume fresh air and reduce the energy consumption of small-volume fresh air. The compressor operating frequency is adjusted according to the fresh air volume and the fresh air intake temperature to maintain a stable indoor temperature. At the same time, a cage-type air intake is designed to increase the fresh air volume, and a plastic grille reduces the cost of fresh air.

[0093] Among them, the air volume sensor 25 and the temperature sensor 26 are used to sense the fresh air volume and the fresh air temperature status, respectively; the double-layer reversing and silencing structure 2 is used as a fresh air reversing and silencing component; the ventilation damper is used to change the direction of fresh air, with direct airflow from the top or side airflow; the oxygen and PM2.5 sensors are used to determine the indoor air quality, thereby determining the air volume. The indoor temperature sensor is used to determine changes in indoor temperature; the rainproof connector 28 assembly consists of a rainproof connector 28 and an air inlet grille 30. The cage design of the rainproof connector 28 effectively increases the fresh air intake volume, and the injection-molded design of the air inlet grille 30 effectively prevents foreign objects from entering the fresh air system.

[0094] The fresh air outlet of the air conditioner is designed at the top. The outlet features a double-layer reversing and noise-reducing structure 2, with an inner porous noise-reducing structure 24 and an internal reversing damper 21. Fresh air can be discharged from both the top and sides of the air conditioner. The top outlet has a shorter air path, resulting in lower wind resistance and lower fan energy consumption, making it suitable for situations requiring a small volume of fresh air. The side outlet, due to the double-layer reversing and noise-reducing structure 2, has a longer path, effectively reducing noise and improving performance for situations requiring a large volume of fresh air.

[0095] Regarding control logic: When the user turns on the fresh air, the temperature sensor of the air conditioner obtains the indoor temperature TA, and the temperature sensor 26 at the fresh air inlet of the air conditioner obtains the fresh air temperature, i.e., the outdoor temperature TB. The internal control system of the air conditioner calculates the indoor-outdoor temperature difference ΔT = |TA, TB|, and the internal control system of the air conditioner calculates the fresh air volume X entering the room according to the data of the fresh air volume sensor 25. The internal control system calculates the heat Q that needs to be compensated in the room according to the indoor-outdoor temperature difference and the fresh air exhaust volume.

[0096] The indoor oxygen sensor obtains the indoor oxygen content, and the PM2.5 sensor obtains the PM2.5 content in the indoor air; the indoor air environment is judged according to the two data. If the indoor air environment does not meet the standard, the fresh air speed is increased. The millimeter-wave radar senses the people in the room. If there is no one in the room, the fresh air speed of the air conditioner is increased, and the fresh air exits from the air duct near the top, shortening the fresh air path. The fresh air noise is large, but the fresh air energy consumption is small. If there are people in the room, the fresh air speed of the air conditioner is increased, the ventilation damper is reversed, and the fresh air exits from the side air duct. The fresh air path is increased, and the inner porous structure can achieve sound absorption more effectively.

[0097] Calculate and judge the heat that needs to be compensated in the room. If Q < Q1, the heat that needs to be compensated is small, and the operating frequency of the compressor does not need to be changed; if Q > Q1, adjust the compressor frequency in time to compensate for the heat and avoid indoor temperature fluctuations.

[0098] The above are only specific implementation manners of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fresh air conditioning system, characterized in that, include: The housing contains a fresh air duct. A fresh air fan is installed in the fresh air duct; A double-layer reversing noise reduction structure is provided at the outlet end of the fresh air duct, and the double-layer reversing noise reduction structure includes a reversing damper; The reversing damper is configured to have a first state and a second state; In the first state, the fresh air duct is connected to the first air outlet located on the top of the casing through the reversing damper to form a first air supply path; In the second state, the fresh air duct is connected to the second air outlet located on the side of the casing through the reversing damper to form a second air supply path; The length of the second air supply path is greater than the length of the first air supply path, and at least a portion of the second air supply path is provided with a sound-absorbing structure.

2. The fresh air conditioner according to claim 1, characterized in that, The silencing structure is a porous silencing structure, which is installed on the channel wall of the second air supply path.

3. The fresh air conditioner according to claim 1 or 2, characterized in that, The fresh air conditioning system also includes: An air volume sensor is installed inside the fresh air duct to detect the fresh air volume; A temperature sensor is installed at the fresh air inlet of the fresh air duct or inside the fresh air duct to detect the fresh air temperature; The control module is electrically connected to the air volume sensor, the temperature sensor, the fresh air fan, and the reversing damper. The control module is configured as follows: The reversing damper is controlled to switch between the first state and the second state based on the fresh air volume detected by the air volume sensor.

4. The fresh air conditioner according to claim 3, characterized in that, The control module is configured as follows: Calculate the change in indoor heat load caused by the introduction of fresh air based on the fresh air volume and the fresh air temperature. The operating frequency of the compressor of the fresh air conditioner is adjusted according to the change in heat load.

5. The fresh air conditioner according to claim 3, characterized in that, The fresh air conditioning system also includes: A personnel detection sensor is installed on the casing to detect whether there are people inside the room; The control module is electrically connected to the personnel sensing sensor and is configured to: When the fresh air volume is greater than the first threshold and the personnel sensing sensor detects that someone is indoors, the reversing damper is controlled to switch to the second state.

6. The fresh air conditioner according to claim 5, characterized in that, The control module is also configured to: When the fresh air volume is greater than the first threshold and the personnel sensing sensor detects that no one is in the room, the reversing damper is controlled to switch to the first state.

7. The fresh air conditioner according to claim 3, characterized in that, The fresh air conditioner also includes an indoor air quality sensor. The control module is electrically connected to the indoor air quality sensor and is configured to adjust the speed of the fresh air fan according to the detection data of the indoor air quality sensor.

8. The fresh air conditioner according to claim 1, characterized in that, The fresh air inlet of the fresh air duct is connected to an outdoor air intake component, which includes a rainproof connector and an air intake grille installed on the inner circumference of the rainproof connector; the rainproof connector has a cage-like structure; and the air intake grille is an injection-molded part.

9. A control method applied to a fresh air conditioning system as described in any one of claims 1-8, characterized in that, The control method includes: Acquisition Steps: Acquire the current fresh air volume of the fresh air conditioner; Judgment steps: Determine whether the current fresh air volume is greater than the preset air volume threshold; Control steps: Based on the result of the judgment steps, control the switching state of the reversing damper; The reversing damper is configured to have a first state and a second state. In the first state, the fresh air duct is connected to a first air outlet located on the top of the casing through the reversing damper to form a first air supply path. In the second state, the fresh air duct is connected to a second air outlet located on the side of the casing through the reversing damper to form a second air supply path. The length of the second air supply path is greater than the length of the first air supply path, and at least a portion of the second air supply path is provided with a sound-absorbing structure.

10. The control method according to claim 9, characterized in that, The control steps include: If the current fresh air volume is greater than the preset air volume threshold, the reversing damper is controlled to switch to the second state, so that the fresh air is sent out through the second air supply path; If the current fresh air volume is less than or equal to the preset air volume threshold, the reversing damper is controlled to switch to the first state, so that the fresh air is sent out through the first air supply path.

11. The control method according to claim 9, characterized in that, The acquisition step also includes: Obtain the fresh air temperature; The control method further includes: Calculation steps: Based on the current fresh air volume and the fresh air temperature, calculate the change in indoor heat load caused by the introduction of fresh air; Adjustment steps: Adjust the operating frequency of the compressor of the fresh air conditioner according to the change in heat load.

12. The control method according to claim 11, characterized in that, In the calculation step: When the absolute value of the heat load change is greater than the first heat threshold, the adjustment step is executed to adjust the compressor frequency; When the absolute value of the change in heat load is less than or equal to the first heat threshold, the current operating frequency of the compressor is maintained.

13. The control method according to claim 9, characterized in that, In the determination step, the preset air volume threshold includes a first air volume threshold and a second air volume threshold, wherein the first air volume threshold is less than the second air volume threshold; The control steps include: If the current fresh air volume is greater than the second air volume threshold, then control the reversing damper to switch to the second state; If the current fresh air volume is greater than the first air volume threshold and less than or equal to the second air volume threshold, the reversing damper is controlled according to the presence of people in the room.

14. The control method according to claim 9, characterized in that, The acquisition step also includes: The presence status of people indoors is obtained through personnel perception sensors; In the control step, controlling the reversing damper based on the presence status of the indoor occupants includes: When someone is inside, control the reversing damper to switch to the second state; When no one is in the room, the reversing damper is switched to the first state.

15. The control method according to claim 9, characterized in that, The acquisition step also includes: Indoor air quality data is obtained through indoor air quality sensors; The control method further includes: Airflow adjustment steps: Based on the indoor air quality data, adjust the speed of the fresh air fan to change the current fresh air volume.

16. The control method according to claim 15, characterized in that, In the air volume adjustment step: The required fresh air volume is calculated based on the indoor air quality data. The speed of the fresh air fan is adjusted according to the difference between the required fresh air volume and the current fresh air volume.

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