Fresh air device, fresh air control method and system

Abstract

The application relates to the air conditioning technical field, and discloses a fresh air device, a fresh air control method and a system. The fresh air device comprises: a device body provided with an air duct communicating indoor and outdoor; an air flow driving part arranged in the air duct; a heat recovery part arranged in the air duct and used for recovering heat of air flowing through the air duct; and a detection control unit arranged in the device body, capable of detecting the internal temperature of the heat recovery part and the dew point temperature of indoor and outdoor, and controlling the forward and reverse rotation of the air flow driving part. The detection control unit can control the forward and reverse rotation of the air flow driving part according to the difference between the internal temperature of the heat recovery part and the dew point temperature of indoor and outdoor, so that the internal temperature of the heat recovery part is higher than the dew point temperature. The application integrates the functions of bidirectional air exchange and heat recovery, controls the forward and reverse rotation of the air flow driving part based on the difference between the internal temperature of the heat recovery part and the corresponding dew point temperature, makes the internal temperature of the heat recovery part higher than the dew point temperature, and effectively prevents the generation of condensation.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning technology, and in particular to a fresh air device, a fresh air control method and system. Background Technology

[0002] As people's living standards improve, their demands for indoor air quality and living comfort are also increasing. Modern buildings are becoming increasingly airtight, and with prolonged use of air conditioning, indoor air often cannot be effectively refreshed, leading to the accumulation of pollutants such as carbon dioxide and odors, which can affect users' health and experience. Therefore, fresh air systems that can introduce outdoor air are gradually becoming an important supplementary device for air-conditioned environments.

[0003] While existing fresh air systems achieve air exchange, they also bring new problems. On the one hand, when there is a temperature difference between indoors and outdoors, directly introducing outdoor air will lead to the loss of indoor cooling or heating, significantly increasing the air conditioning load and causing energy waste. Although some devices use heat recovery devices, condensation is prone to form on the surface of their heat exchange cores during long-term operation. This not only breeds mold and affects hygiene, but may also damage the equipment or require complex drainage structures, increasing costs and installation space.

[0004] Therefore, there is an urgent need in this field for a fresh air solution that can effectively recover heat while preventing condensation. Summary of the Invention

[0005] This invention provides a fresh air device, a fresh air control method, and a system, aiming to solve the problem of preventing condensation while achieving effective heat recovery.

[0006] In a first aspect, embodiments of the present invention provide a fresh air device, comprising: The main body of the device is equipped with an air duct connecting the indoor and outdoor sides; An airflow drive unit is disposed in the air duct; A heat recovery component is installed in the air duct to recover heat from the air flowing through the air duct; A detection and control unit is disposed within the device body and configured to detect the internal temperature of the heat recovery component, detect the dew point temperature on the indoor and outdoor sides, and control the forward and reverse rotation of the airflow drive unit. The detection and control unit is configured to control the forward and reverse rotation of the airflow drive unit according to the change in the difference between the internal temperature of the heat recovery component and the indoor and outdoor dew point temperatures, so as to maintain the internal temperature of the heat recovery component above the dew point temperature.

[0007] Secondly, embodiments of the present invention provide a fresh air control method, applied to the fresh air device described above, the fresh air control method comprising: When the two-way ventilation mode is activated, the dew point temperature on the indoor side and the dew point temperature on the outdoor side are detected. By comparing the dew point temperatures of the indoor and outdoor sides, the airflow is driven by the airflow drive unit to flow from the high-temperature side to the low-temperature side; The heat recovery component absorbs heat and raises the temperature of the air flowing through the air duct, and the internal temperature of the heat recovery component is detected. When the internal temperature of the heat recovery component is greater than the dew point temperature on the high-temperature side, and the difference reaches the first temperature difference threshold, the operating direction of the airflow drive unit is switched.

[0008] Thirdly, embodiments of the present invention provide a fresh air control system, which is applied to the fresh air device described above.

[0009] The beneficial effects of this invention are as follows: the fresh air device integrates bidirectional ventilation and heat recovery functions, and can control the forward and reverse rotation of the airflow drive unit based on the difference between the internal temperature of the heat recovery component and the dew point temperature of the room and outside, so that the internal temperature of the heat recovery component is always maintained above the dew point temperature, thereby fundamentally preventing the generation of condensation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is an indoor front view of a fresh air device provided in an embodiment of the present invention.

[0012] Figure 2 for Figure 1 A cross-sectional view from a mid-angle perspective (AA).

[0013] Figure 3 This is an exploded structural diagram of a fresh air device provided in an embodiment of the present invention.

[0014] Figure 4 Environmental application diagram of the fresh air device provided in the embodiments of the present invention. Figure 5 This is a schematic diagram of the detection and control unit provided in an embodiment of the present invention.

[0015] Figure 6 This is a flowchart illustrating the fresh air control method provided in an embodiment of the present invention.

[0016] Figure 7 This is another schematic diagram of the fresh air control method provided in the embodiments of the present invention.

[0017] Figure 8 This is another schematic diagram of the fresh air control method provided in an embodiment of the present invention. Figure 9 This is another schematic diagram of the fresh air control method provided in the embodiments of the present invention.

[0018] Explanation of the markings in the image: 1. Fresh air unit; 11. Face mask; 12. Heat recovery component; 13. First housing; 14. Airflow drive unit; 15. Detection and control unit; 151. First detection module; 152. Second detection module; 153. Air quality detection module; 154. Control module; 16. Second housing; 17. Air duct; 18. First air outlet; 19. Second air outlet; 2. Indoor side; 3. Outdoor side. Detailed Implementation

[0019] 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, not all, of the embodiments of the present invention. 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.

[0020] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0024] Please see Figure 1-4 , Figure 1 This is a front view of the indoor side 2 of the fresh air device 1 provided in an embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view of AA from a mid-angle perspective; Figure 3 This is an exploded structural diagram of the fresh air device 1 provided in an embodiment of the present invention; Figure 4 An environmental application diagram of the fresh air device 1 provided in an embodiment of the present invention.

[0025] Please see Figure 1-4 This invention provides a fresh air device 1, comprising: The main body of the device is equipped with an air duct connecting the indoor side 2 and the outdoor side 3; Airflow drive unit 14 is disposed in the air duct; The heat recovery component 12 is installed in the air duct and is used to recover heat from the air flowing through the air duct. The detection control unit 15 is installed in the device body and is configured to detect the internal temperature of the heat recovery component 12, detect the dew point temperature of the indoor side 2 and the outdoor side 3, and control the forward and reverse rotation of the airflow drive unit 14. The detection control unit 15 is configured to control the forward and reverse rotation of the airflow drive unit 14 according to the change in the difference between the internal temperature of the heat recovery component 12 and the indoor and outdoor dew point temperatures, so as to keep the internal temperature of the heat recovery component 12 higher than the dew point temperature.

[0026] In this embodiment, the core architecture of the fresh air device 1 consists of the device body, the airflow drive unit 14, the heat recovery component 12, and the detection and control unit 15.

[0027] The single air duct connecting the indoor and outdoor areas is the physical basis of the entire device.

[0028] The airflow drive unit 14 serves as the power source for airflow and can be an axial flow fan. The airflow drive unit 14 can rotate forward and reverse according to the control signal of the detection and control unit 15, thereby switching the airflow direction in the duct, that is, integrating the two functions of air supply and exhaust into a single duct.

[0029] The heat recovery component 12 is installed in the air duct. It can use its own heat capacity characteristics to exchange heat with the air when the airflow passes through it. In the process of absorbing heat (from the air with a higher temperature) or releasing heat (to the air with a lower temperature), it can realize the transfer and storage of energy.

[0030] The detection and control unit 15 is the processing center of the system. It is used to continuously monitor at least two key parameters: the real-time internal temperature of the heat recovery component 12 and the indoor and outdoor dew point temperatures calculated from the indoor and outdoor temperature and humidity. Then, based on the difference between the real-time internal temperature of the heat recovery component 12 and the indoor and outdoor dew point temperatures, the rotation direction of the airflow drive unit 14 is dynamically adjusted to achieve bidirectional ventilation and heat recovery in the room and to prevent condensation in the heat recovery component 12.

[0031] The fresh air device 1 in this embodiment integrates bidirectional ventilation and heat recovery functions. It can control the forward and reverse rotation of the airflow drive unit 14 based on the difference between the internal temperature of the heat recovery component 12 and the indoor and outdoor dew point temperatures, ensuring that the internal temperature of the heat recovery component 12 is always maintained above the dew point temperature. Understandably, if the airflow drive unit 14 drives air from the high-temperature side to the low-temperature side, the internal temperature of the heat recovery component 12 will absorb heat and rise. At this time, the internal temperature of the heat recovery component 12 will only be higher than the dew point temperature. When the operating direction of the airflow drive unit 14 is switched to allow air to flow from the low-temperature side to the high-temperature side, the internal temperature of the heat recovery component 12 will decrease. However, before it drops below the dew point temperature, the operating direction of the airflow drive unit 14 will be switched again. This process repeats, ensuring that the internal temperature of the heat recovery component 12 is always maintained above the dew point temperature; thus, condensation is fundamentally prevented. This effectively solves a series of problems caused by condensation in traditional heat recovery fresh air systems in high-humidity environments, such as mold growth and the need for additional drainage devices, while also avoiding the impact on user comfort caused by frequent shutdowns to prevent condensation.

[0032] Please continue reading. Figure 4 The fresh air unit 1 is installed on the indoor wall 2, and its duct 17 extends to the outdoor wall 3. The fresh air unit 1 uses a single air duct to achieve bidirectional air exchange and heat recovery functions; its airflow path is: indoor -- first air outlet 18 -- heat recovery component 12 (or airflow drive unit 14) -- airflow drive unit 14 (or heat recovery component 12) -- second air outlet 19 -- outdoor, that is... Figure 4 The solid arrow indicates the direction of exhaust flow, while the dashed arrow indicates the opposite direction of intake flow, which is the bidirectional air exchange path of the present invention.

[0033] The device body of the present invention will be described in detail below.

[0034] See Figure 3 and Figure 4In one embodiment, the device body includes a housing, a face mask 11, and an air duct 17; The housing has a channel opening connecting both sides; The face mask 11 is installed at one end of the passageway and corresponds to the indoor side 2; One end of the duct 17 is installed at the other end of the passage opening, and the other end of the duct 17 is connected to the outdoor side 3. The duct 17 and the passage opening form an air duct. The airflow drive unit 14 and the heat recovery unit 12 are installed in the channel opening.

[0035] In this embodiment, the core structure of the device body consists of a shell, a mask 11, and an air duct 17.

[0036] The shell serves as the main frame and is installed on the wall of the indoor side 2. The shell includes a first shell 13 and a second shell 16 that can be joined and installed together. The middle of the first shell 13 and the second shell 16 is not hollowed out and forms a channel opening connecting the two sides. The first shell 13 and the second shell 16 are provided with an installation cavity at the snap-fit ​​joint. The installation cavity is used to install various components of the fresh air device 1 (such as the control module 154 of the detection and control unit 15, various circuits, etc.).

[0037] Among them, the mask 11 is installed on the side of the shell facing the room. It is usually designed with an aesthetically pleasing grille or mesh cover. While ensuring smooth airflow, it also serves the functions of safety protection and integration into the interior decoration.

[0038] The airflow drive unit 14 and the heat recovery component 12 are both fixedly installed inside the channel opening, ensuring that air must flow through these two components. Specifically, the heat recovery component 12 can be located between the mask 11 and the airflow drive unit 14, or the airflow drive unit 14 can be located between the mask 11 and the heat recovery component 12.

[0039] The duct 17 extends from the indoor side 2 to the outdoor side 3. One end of the duct 17 is connected to the other end of the passage opening, which is responsible for connecting the fresh air device 1 with the outdoor environment. One end of the duct 17 can be fixed and installed using screws or other fasteners. At the same time, a sealing structure is set at the installation point to ensure a sealed connection with the passage opening. The other end of the duct 17 extends completely out of the outdoor side 3.

[0040] In this embodiment, the first housing 13, the second housing 16, the mask 11 and the air duct 17 work together to form a complete, sealed and clearly oriented airflow path, ensuring that air can flow efficiently through the heat recovery component 12 for heat recovery in all modes.

[0041] The thermal storage material of the present invention will be described in detail below.

[0042] In one embodiment, the interior of the heat recovery component 12 is provided with a heat storage material having heat capacity characteristics.

[0043] In this embodiment, the heat recovery component 12 is filled with a heat storage material with high heat capacity. This type of material is characterized by its ability to store a large amount of heat per unit mass or unit volume. In practical applications of this invention, various heat storage materials can be selected, such as ceramic materials with high specific heat capacity, dense concrete components, or specific types of phase change materials. These materials can effectively absorb and store the heat energy (whether cold or hot) flowing through the air. When the airflow direction changes, the stored energy is released to the air flowing in the opposite direction, thus completing the heat recovery process.

[0044] Preferably, considering both performance and cost, the present invention uses a ceramic honeycomb structure with a specific ratio as the heat storage material. This material not only has a large heat capacity but also provides a large specific surface area, which is conducive to rapid and sufficient heat exchange with the air.

[0045] The detection control unit 15 of the present invention will be described in detail below.

[0046] Combination Figure 5 , Figure 5 This is a schematic diagram of the detection control unit 15 provided in an embodiment of the present invention.

[0047] In one embodiment, the detection control unit 15 includes a first detection module 151, a second detection module 152, and a control module 154; The first detection module 151 is disposed on the device body and is used to detect the internal temperature of the heat recovery component 12; The second detection module 152 is installed on the device body and is used to detect the dew point temperature of the indoor side 2 and the outdoor side 3. The control module 154 is mounted on the device body and is used to control the forward and reverse rotation of the airflow drive unit 14.

[0048] In this embodiment, the detection control unit 15 is divided into functional modules, and the detection control unit 15 includes at least a first detection module 151, a second detection module 152, and a control module 154.

[0049] The first detection module 151 can be a temperature sensor, which can be directly arranged inside the heat recovery component 12 or close to its surface, to accurately detect the real-time internal temperature of the heat storage material.

[0050] The second detection module 152 needs to acquire the temperature and humidity parameters of the indoor side 2 and the outdoor side 3, and then calculate the dew point temperature of the indoor side 2 and the outdoor side 3. For example, this can be achieved by setting temperature and humidity sensors on the inside of the mask 11 and the outside of the air duct 17, respectively, so as to calculate the accurate indoor and outdoor dew point temperature.

[0051] The control module 154 (such as a microprocessor unit) can be installed in the mounting cavity inside the housing. The control module 154 can receive data from all sensors, execute preset control algorithms, and finally output control signals to make the motor of the airflow drive unit 14 rotate forward or backward. All detection sensors (including the air quality detection sensor described below) and the control module 154 can be interconnected by cables or wirelessly to work together.

[0052] This embodiment divides the detection and control unit 15 into functional modules and deploys sensors both indoors and outdoors, enabling the system to acquire real-time environmental parameters and laying a data foundation for control decisions. Integrating the control module 154 within the device enables independent intelligent operation of the equipment, eliminating the need for an external controller, simplifying system configuration, and improving the overall product integrity.

[0053] Continue reading Figure 5 In one embodiment, the detection control unit 15 further includes an air quality detection module 153, which is disposed on the device body and is used to detect the air quality on the indoor side 2 and the outdoor side 3.

[0054] In this embodiment, the air quality detection module 153 is also integrated on the device body. It can also be implemented by setting air quality detection sensors on the inside of the mask 11 and the outside of the air duct 17 to detect outdoor air quality. These detection data, such as PM2.5 particulate matter concentration and CO2 gas concentration, can be transmitted to the control module 154 in real time.

[0055] In this embodiment, the introduction of an air quality detection module 153 effectively expands the functionality and intelligence of the device. This allows the fresh air device 1 to function not merely as a temperature-controlled ventilation system, but as an intelligent environmental regulator capable of comprehensively responding to indoor air quality. Based on indoor and outdoor air quality data, the control module 154 can intelligently select the operating mode most favorable to the indoor environment. For example, it can reduce the introduction of fresh air when outdoor smog is severe, or actively introduce fresh air when there are many people indoors causing an increase in CO2 concentration. This ensures user health while achieving more refined energy-saving control (i.e., the unidirectional exhaust and unidirectional intake control in steps S801-S803 below).

[0056] Please see Figure 6 The present invention provides a flowchart of a fresh air control method.

[0057] Please see Figure 6 The fresh air control method is applied to the fresh air device 1 as described above, and the fresh air control method includes steps S601-S604: S601. When the two-way ventilation mode is activated, the dew point temperature of the indoor side 2 and the dew point temperature of the outdoor side 3 are detected. S602. By comparing the dew point temperatures of the indoor side 2 and the outdoor side 3, the air is driven from the high temperature side to the low temperature side by the airflow drive unit 14. S603. The heat recovery component 12 absorbs heat and raises the temperature of the air flowing through the air duct, and detects the internal temperature of the heat recovery component 12. S604. Calculate the difference between the internal temperature of the heat recovery component 12 and the dew point temperature on the high-temperature side. When the internal temperature of the heat recovery component 12 is greater than the dew point temperature on the high-temperature side and the difference reaches the first temperature difference threshold, switch the running direction of the airflow drive unit 14.

[0058] This embodiment defines the control logic for starting the bidirectional ventilation mode. Specifically, the system first calculates and compares the dew point temperatures of the indoor side 2 and the outdoor side 3 to determine the current high-temperature side and low-temperature side. Upon startup, the control module 154 controls the airflow drive unit 14 to run in one direction, which is set to drive air from the high-temperature side to the low-temperature side. During this process, the air on the high-temperature side flows through the duct and passes through the heat recovery component 12 before entering the low-temperature side. The heat of the air is absorbed and stored by the heat storage material in the heat recovery component 12, causing the temperature of the heat recovery component 12 itself to rise from the initial state. The system continuously monitors the internal temperature of the heat recovery component 12 and compares it with the dew point temperature of the high-temperature side, calculating the difference between the two. When the internal temperature of the heat recovery component 12 is greater than the dew point temperature of the high-temperature side and the difference reaches a first temperature difference threshold (e.g., 5°C), the running direction of the airflow drive unit 14 needs to be switched.

[0059] It should be noted that when the internal temperature of the heat recovery component 12 is greater than the dew point temperature on the high-temperature side and the difference reaches the first temperature difference threshold, the operating direction of the airflow drive unit 14 needs to be switched. This is to save energy because if the indoor side 2 is cooling, the high-temperature air from the outdoor side 3 will continuously enter the indoor side 2, causing the indoor side 2 to continuously lose cooling energy, which will increase the load on the air conditioner.

[0060] It should also be noted that the core effect of the startup control strategy in this embodiment is active preheating and anti-condensation. Specifically, by forcing the initial airflow from the high-temperature side to the low-temperature side, it ensures that the heat recovery component 12 is in a heat absorption and heating state in the initial stage, thereby quickly raising its internal temperature to above the corresponding dew point temperature. This effectively avoids the problem of condensation immediately occurring when the heat recovery component 12 directly contacts the high-temperature and high-humidity air at the moment of startup, laying a solid foundation for subsequent stable and condensation-free operation.

[0061] Please see Figure 7 , Figure 7This is another schematic diagram of the fresh air control method provided in the embodiments of the present invention.

[0062] Please see Figure 7 The fresh air control method also includes steps S701-S702: S701. When the bidirectional ventilation mode is running continuously, the heat recovery component 12 releases heat to the air flowing through the air duct and detects the internal temperature of the heat recovery component 12. S702. Calculate the difference between the internal temperature of the heat recovery component 12 and the dew point temperature on the high-temperature side. When the internal temperature of the heat recovery component 12 is greater than the dew point temperature on the high-temperature side and the difference reaches the second temperature difference threshold, switch the running direction of the airflow drive unit 14.

[0063] This embodiment defines the dynamic control logic during continuous operation in bidirectional ventilation mode. After the initial airflow direction switch, the heat recovery component 12 faces the air from the low-temperature side and begins the heat release process, causing its internal temperature to drop. The control module 154 continuously compares the difference between the internal temperature of the heat recovery component 12 and the current dew point temperature on the high-temperature side. When this difference narrows to a second temperature difference threshold (e.g., 1°C), it means that the temperature of the heat recovery component 12 is approaching the danger zone and there is a risk of condensation. The system then switches the operating direction of the airflow drive unit 14 again, causing the heat recovery component 12 to re-enter the heat absorption and heating phase. This cycle repeats, forming a dynamic breathing-like switching around the dew point temperature.

[0064] The continuous operation switching control in this embodiment achieves a balance between dynamic anti-condensation and continuous heat recovery. By periodically switching the airflow direction, it ensures that the heat recovery component 12 can continuously switch between heat absorption and heat release, thereby effectively transferring energy between indoor and outdoor air. Simultaneously, through strict temperature difference threshold control, it maintains the internal temperature of the heat recovery component 12 within a safe range above the dew point temperature on the high-temperature side, effectively preventing condensation during continuous operation. The entire system achieves fully automatic, high-efficiency, and highly reliable operation without manual intervention.

[0065] Please see Figure 8 , Figure 8 This is another schematic diagram of the fresh air control method provided in the embodiments of the present invention.

[0066] Please see Figure 8 The fresh air control method also includes steps S801-S803: S801, Detect the air quality coefficients of the indoor side 2 and the outdoor side 3, and proceed to step S802 or S803; S802. When the air quality coefficient of the indoor side 2 is lower than that of the outdoor side 3, the airflow drive unit 14 drives the air to flow from the outdoor side 3 to the indoor side 2. S803 When the air quality coefficient of the indoor side 2 is higher than that of the outdoor side 3, the airflow drive unit 14 controls the airflow to flow from the indoor side 2 to the outdoor side 3.

[0067] This embodiment provides an intelligent one-way ventilation control strategy based on air quality. Specifically, the system continuously monitors and compares the air quality coefficients (which can be calculated based on parameters such as PM2.5 and CO2) of the indoor side 2 and the outdoor side 3 through the air quality detection module 153. When the control module 154 determines that the air quality of the indoor side 2 is worse than that of the outdoor side 3 (for example, the indoor CO2 concentration exceeds 1000 ppm, while the outdoor PM2.5 concentration is good), the fresh air mode is activated, and the airflow drive unit 14 is controlled to rotate forward to introduce fresh air from the outdoor side 3 into the indoor side 2. Conversely, when the air quality of the outdoor side 3 is determined to be worse than that of the indoor side 2 (for example, the outdoor PM2.5 is extremely high while the indoor air is clean), the exhaust mode is activated, and the airflow drive unit 14 is controlled to rotate in reverse to exhaust the stale air from the indoor side 2. Although no fresh air is introduced at this time, maintaining a slight positive pressure indoors can prevent the infiltration of polluted outdoor air.

[0068] This embodiment ensures that the ventilation behavior of the fresh air device 1 prioritizes optimizing indoor air quality at all times, rather than mechanically exchanging air. For example, in smoggy weather, it automatically avoids introducing polluted air and instead maintains clean indoor air by exhausting polluted air, protecting user health; while when indoor air is polluted, it can promptly introduce fresh air. This greatly enhances the product's practicality and user experience, achieving a balance between health, energy saving, and comfort.

[0069] Please see Figure 9 , Figure 9 This is another schematic diagram of the fresh air control method provided in the embodiments of the present invention.

[0070] Please see Figure 9 The fresh air control method also includes steps S901-S903: S901. Before starting the bidirectional ventilation mode or during operation, calculate and compare the dynamic difference between the actual temperature on the high-temperature side and its dew point temperature. S902. When the dynamic difference is greater than a preset multiple of the first temperature difference threshold, the value of the first temperature difference threshold remains unchanged. S903. When the dynamic difference is less than or equal to a preset multiple of the first temperature difference threshold, the first temperature difference threshold is reduced.

[0071] In this embodiment, the preset multiple can be a multiple greater than 1 (such as 1.5 times). When the dynamic difference is larger (i.e., greater than the preset multiple of the first temperature difference threshold), it indicates that the ambient air is relatively dry and the risk of condensation is low. At this time, the standard first temperature difference threshold (such as 5°C in the previous example) can be used to prioritize the heat recovery efficiency.

[0072] The smaller the dynamic difference (i.e., greater than a preset multiple of the first temperature difference threshold), the higher the humidity on the high-temperature side of the environment (such as on foggy days), and the higher the risk of condensation. At this time, the detection and control unit 15 dynamically reduces the actual value of the first temperature difference threshold, thereby avoiding condensation caused by excessive humidity on the high-temperature side.

[0073] In one specific implementation, the dynamic first temperature difference threshold can be implemented using a function preset in the control module 154 or a lookup table method, for example: First temperature difference threshold = max(minimum threshold, k * dynamic difference) Where k is an adjustment coefficient less than or equal to 1 (e.g., k=0.8), the max function is used to ensure that the first temperature difference threshold is not lower than the preset minimum safety value. The minimum safety value cannot be lower than the second temperature difference threshold and must have a certain temperature difference. If the dynamically adjusted first temperature difference threshold is actually lower than the minimum safety value, then the bidirectional ventilation mode is exited.

[0074] This invention also provides a fresh air control system, including the fresh air device described above.

[0075] In summary, the fresh air device of the present invention integrates bidirectional ventilation and heat recovery functions. It can control the forward and reverse rotation of the airflow drive unit 14 based on the difference between the internal temperature of the heat recovery component 12 and the indoor and outdoor dew point temperatures, ensuring that the internal temperature of the heat recovery component 12 is always maintained above the dew point temperature, thereby fundamentally preventing condensation. This solves a series of problems caused by condensation in traditional heat recovery fresh air systems in high-humidity environments, such as mold growth, equipment corrosion, and the need for additional drainage devices. It also avoids the impact on user comfort caused by frequent shutdowns to prevent condensation.

[0076] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0077] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims and their equivalents, this invention also intends to include these modifications and variations.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fresh air device, characterized in that, include: The main body of the device is equipped with an air duct connecting the indoor and outdoor sides; An airflow drive unit is disposed in the air duct; A heat recovery component is installed in the air duct and contains a heat storage material with heat capacity characteristics to recover heat from the air flowing through the air duct. The detection and control unit includes a first detection module, a second detection module, and a control module. The first detection module is disposed on the device body and is used to detect the internal temperature of the heat recovery component. The second detection module is disposed on the device body and is used to detect the dew point temperature on the indoor and outdoor sides. The control module is disposed on the device body and is used to control the forward and reverse rotation of the airflow drive unit. The detection and control unit is configured to control the forward and reverse rotation of the airflow drive unit based on the difference between the internal temperature of the heat recovery component and the dew point temperature on the high-temperature side of the indoor and outdoor environments, so as to maintain the internal temperature of the heat recovery component higher than the dew point temperature on the high-temperature side. Specifically, when the bidirectional ventilation mode is activated, the dew point temperature on the indoor side and the dew point temperature on the outdoor side are detected; by comparing the dew point temperatures on the indoor and outdoor sides, the airflow drive unit drives air to flow from the high-temperature side to the low-temperature side; the heat recovery component absorbs heat and raises the temperature of the air flowing through the air duct, and the internal temperature of the heat recovery component is detected; [The text abruptly ends here, likely due to an incomplete translation or source material.] The difference between the internal temperature of the heat recovery component and the dew point temperature of the high-temperature side is calculated. When the internal temperature of the heat recovery component is greater than the dew point temperature of the high-temperature side and the difference reaches a first temperature difference threshold, the operating direction of the airflow drive unit is switched. When the bidirectional ventilation mode is running continuously, the heat recovery component releases heat to the air flowing through the air duct, and the internal temperature of the heat recovery component is detected. The difference between the internal temperature of the heat recovery component and the dew point temperature of the high-temperature side is calculated. When the internal temperature of the heat recovery component is greater than the dew point temperature of the high-temperature side and the difference reaches a second temperature difference threshold, the operating direction of the airflow drive unit is switched.

2. The fresh air device according to claim 1, characterized in that, The device body includes: The housing has a channel opening connecting both sides; A face mask is installed at one end of the passageway and corresponds to the indoor side; A duct, one end of which is installed at the other end of the passage opening, and the other end of which is connected to the outdoor side and forms a duct with the passage opening; The airflow drive unit and the heat recovery component are installed in the channel opening.

3. The fresh air device according to claim 1, characterized in that, The detection and control unit also includes: An air quality detection module is installed on the main body of the device and is used to detect the air quality on the indoor and outdoor sides.

4. A fresh air control method, characterized in that, The fresh air control method, applied to the fresh air device according to any one of claims 1-3, comprises: When the two-way ventilation mode is activated, the dew point temperature on the indoor side and the dew point temperature on the outdoor side are detected. By comparing the dew point temperatures of the indoor and outdoor sides, the airflow is driven by the airflow drive unit to flow from the high-temperature side to the low-temperature side; The heat recovery component absorbs heat and raises the temperature of the air flowing through the air duct, and the internal temperature of the heat recovery component is detected. Calculate the difference between the internal temperature of the heat recovery component and the dew point temperature on the high-temperature side. When the internal temperature of the heat recovery component is greater than the dew point temperature on the high-temperature side and the difference reaches the first temperature difference threshold, switch the running direction of the airflow drive unit. When the bidirectional ventilation mode is running continuously, the heat recovery component releases heat to the air flowing through the air duct and detects the internal temperature of the heat recovery component. The difference between the internal temperature of the heat recovery component and the dew point temperature on the high-temperature side is calculated. When the internal temperature of the heat recovery component is greater than the dew point temperature on the high-temperature side and the difference reaches the second temperature difference threshold, the operating direction of the airflow drive unit is switched.

5. The fresh air control method according to claim 4, characterized in that, Also includes: The air quality coefficients of the indoor and outdoor sides were measured; When the air quality coefficient on the indoor side is lower than that on the outdoor side, the airflow drive unit is controlled to drive air to flow from the outdoor side to the indoor side. When the air quality coefficient on the indoor side is higher than that on the outdoor side, the airflow drive unit is controlled to drive the air to flow from the indoor side to the outdoor side.

6. The fresh air control method according to claim 4, characterized in that, Also includes: Before activating the bidirectional ventilation mode or during operation, calculate and compare the dynamic difference between the actual temperature on the high-temperature side and its dew point temperature. When the dynamic difference is greater than a preset multiple of the first temperature difference threshold, the value of the first temperature difference threshold remains unchanged; When the dynamic difference is less than or equal to a preset multiple of the first temperature difference threshold, the first temperature difference threshold is reduced.

7. A fresh air control system, characterized in that, Includes the fresh air device as described in any one of claims 1-3.

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