Fresh air ventilator control method and device, fresh air ventilator and electronic equipment

Abstract

The invention relates to the technical field of fresh air treatment equipment, and discloses a control method and device of a fresh air ventilator, the fresh air ventilator and electronic equipment. The control method comprises the step of determining the indoor and outdoor enthalpy difference. Under the condition that the enthalpy difference is not larger than a first enthalpy difference threshold value, the fresh air ventilator is controlled to operate in a total heat mode; under the condition that the enthalpy difference is larger than a first enthalpy difference threshold value, the fresh air machine is controlled to operate in an exhaust mode; in the total heat mode, a fan module of the fresh air ventilator runs for a first time threshold value in a first state and then runs for a second time threshold value in a second state; and in the exhaust mode, the fan module firstly runs for a third time threshold value in the first state, and then runs for a fourth time threshold value in the second state after downshifting. The problems that in the prior art, a fresh air ventilator is more smoother in summer and more colder in winter, and the comfort level of a user is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air processing equipment, and in particular to a control method and a control device for a fresh air blower, a fresh air blower and electronic equipment. Background Art

[0002] A fresh air fan is an effective air purification device that can circulate indoor air. On the one hand, it discharges the polluted air indoors to the outside, and on the other hand, it sterilizes, disinfects, and filters the fresh air outdoors (i.e., fresh air) before inputting it into the room, so that the room is filled with fresh and clean air at all times.

[0003] Existing fresh air fans cannot take into account the indoor temperature and humidity when introducing fresh air into the room and exhausting air to the outside, resulting in the phenomenon of "the more you change, the more stuffy it becomes" in summer and "the more you change, the colder it becomes" in winter, affecting the user's comfort.

[0004] Therefore, how to avoid the phenomenon of "it gets more stuffy the more you change" in summer and "it gets colder the more you change" in winter and improve user comfort is an issue that the industry urgently needs to solve. Summary of the Invention

[0005] The present invention provides a control method, a control device, a fresh air fan and an electronic device for solving the problem in the prior art that the fresh air fan tends to become "more stuffy the more it is changed" in summer and "more cold the more it is changed" in winter, thereby affecting the user's comfort.

[0006] A first aspect of the present invention provides a method for controlling a fresh air blower, comprising: Determine the enthalpy difference between indoors and outdoors; When the enthalpy difference is not greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in a full heat mode; When the enthalpy difference is greater than the first enthalpy difference threshold, controlling the fresh air fan to operate in exhaust mode; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

[0007] According to the control method of the fresh air fan provided by the present invention, after determining the indoor and outdoor enthalpy difference, the method further includes: When the enthalpy difference is greater than the second enthalpy difference threshold, the fresh air fan is controlled to operate in the exhaust mode while the air conditioner is also controlled to start; the second enthalpy difference threshold is greater than the first enthalpy difference threshold.

[0008] According to the control method of the new air blower provided by the present invention, before the air blower module operates in the first state, the method further includes: Obtain indoor carbon dioxide concentration and fresh air carbon dioxide concentration; When the indoor carbon dioxide concentration exceeds an appropriate concentration threshold, the rotational speed of the fan module when operating in the first state is determined based on a relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration.

[0009] According to the control method of the fresh air fan provided by the present invention, determining the rotational speed of the fan module when operating in the first state based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration includes: Determining the fresh air volume based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration; Based on the corresponding relationship between the fresh air volume and the rotational speed, the rotational speed of the fan module when operating in the first state is determined.

[0010] According to the control method of the fresh air blower provided by the present invention, the determination of the fresh air volume based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration includes: The fresh air volume is determined based on the indoor carbon dioxide concentration, the fresh air carbon dioxide concentration, and the generation rate of carbon dioxide.

[0011] According to the control method of the fresh air fan provided by the present invention, determining the enthalpy difference between indoor and outdoor includes: Get outdoor temperature, outdoor humidity, indoor temperature and indoor humidity; determining an outdoor enthalpy value based on the outdoor temperature and the outdoor humidity; determining an indoor enthalpy value based on the indoor temperature and the indoor humidity; An indoor-outdoor enthalpy difference is determined based on the indoor enthalpy value and the outdoor enthalpy value.

[0012] According to the control method of the new air blower provided by the present invention, the first state includes the forward rotation of the air blower module, and the second state includes the reverse rotation of the air blower module.

[0013] A second aspect of the present invention provides a control device for a fresh air blower, comprising: An enthalpy difference determination module is used to determine the enthalpy difference between indoor and outdoor; a mode control module, configured to control the fresh air fan to operate in a full heat mode when the enthalpy difference is not greater than a first enthalpy difference threshold; for controlling the fresh air fan to operate in exhaust mode when the enthalpy difference is greater than the first enthalpy difference threshold; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

[0014] A third aspect of the present invention provides a fresh air fan, which is controlled by the fresh air fan control method described in any one of the above items; the fresh air fan comprises: a housing having a mounting cavity therein; A heat exchange core is arranged in the installation cavity and is used for storing and releasing heat; A fan module is disposed in the installation cavity and located on one side of the heat exchange core; the fan module includes a first state and a second state; In the first state, the fan module is used to introduce outdoor fresh air into the room; in the second state, the fan module is used to exhaust indoor air to the outside.

[0015] A second aspect of the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a control method for a fresh air fan as described in any one of the above items when executing the computer program.

[0016] The control method for a fresh air fan provided by the present invention utilizes a full heat exchange mode when the enthalpy difference is no greater than a first enthalpy difference threshold, indicating that the indoor and outdoor enthalpy values ​​are similar (e.g., a small temperature difference and similar humidity). This mode allows for the introduction of fresh air while simultaneously recovering 60% to 70% of the sensible and latent heat, thereby reducing the air conditioning load. The full heat mode maintains gentle ventilation when the enthalpy difference is small, preventing sudden changes in temperature and humidity that can cause discomfort. When the enthalpy difference is greater than the first enthalpy difference threshold, indicating that the indoor enthalpy value is significantly higher than the outdoor enthalpy value (e.g., during high temperatures and high humidity in the summer) or significantly lower than the outdoor enthalpy value (e.g., during severe winter weather), indoor air is preferentially exhausted, avoiding the introduction of air with extreme enthalpy values ​​that could lead to a surge in energy efficiency. This also prevents the phenomenon of "more air exchange, more stuffiness" in the summer or "more air exchange, more cold" in the winter. Furthermore, when the enthalpy difference is excessive, such as in winter, the fresh air fan in full heat mode is prone to frost or condensation accumulation in the heat exchanger. The exhaust mode reduces the risk of freezing damage to the heat exchanger and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is one of the flow charts of the control method of the fresh air fan provided by the present invention.

[0019] Figure 2 This is the second flow chart of the control method of the fresh air fan provided by the present invention.

[0020] Figure 3 It is a structural schematic diagram of the control device of the fresh air fan provided by the present invention.

[0021] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention.

[0022] Figure 5 This is one of the structural schematic diagrams of the silicon carbide ceramic unit of the heat exchange core provided by the present invention.

[0023] Figure 6 This is the second structural schematic diagram of the silicon carbide ceramic unit of the heat exchange core provided by the present invention.

[0024] Figure 7 This is the third structural schematic diagram of the silicon carbide ceramic unit of the heat exchange core provided by the present invention.

[0025] Figure 8 yes Figure 7 Schematic diagram of the structure of the AA section.

[0026] Figure 9 This is the fourth structural schematic diagram of the silicon carbide ceramic unit of the heat exchange core provided by the present invention.

[0027] Figure 10 This is a schematic diagram of the structure of the heat exchange core provided by the present invention, and the flow channel is not shown in the figure.

[0028] Reference numerals: 110. Silicon carbide ceramic unit; 101. Flow channel; 102. Air inlet; 103. Air outlet. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] The following combination Figures 1 to 10 The present invention provides a control method, a control device, a fresh air fan, and an electronic device for a fresh air fan. The control method for the fresh air fan may be performed by a controller.

[0031] like Figure 1 As shown, a specific embodiment of the first aspect of the present invention provides a control method for a fresh air blower, which includes S100 and S200.

[0032] S100. Determine the enthalpy difference between indoors and outdoors.

[0033] S200, when the enthalpy difference is not greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in a full heat mode; When the enthalpy difference is greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in an exhaust mode; In full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; The fan module is used to introduce outdoor fresh air into the room when it operates in the first state, and is used to discharge indoor air to the room when it operates in the second state.

[0034] In this implementation, when the enthalpy difference is no greater than the first enthalpy difference threshold, indicating that the indoor and outdoor enthalpy values ​​are similar (e.g., a small temperature difference and similar humidity), full heat exchange mode is used. This allows for the introduction of fresh air while recovering 60% to 70% of the sensible and latent heat, reducing the air conditioning load. Full heat mode maintains gentle ventilation when the enthalpy difference is small, preventing sudden changes in temperature and humidity that can cause discomfort. When the enthalpy difference is greater than the first enthalpy difference threshold, indicating that the indoor enthalpy value is significantly higher than the outdoor enthalpy value (e.g., during high temperatures and high humidity in the summer) or significantly lower than the outdoor enthalpy value (e.g., during severe winter weather), indoor air is preferentially exhausted to avoid the introduction of air with extreme enthalpy values, which can lead to a surge in energy efficiency. This also prevents the phenomenon of "more air exchange, more stuffiness" in the summer or "more air exchange, more cold" in the winter. Furthermore, when the enthalpy difference is excessive, such as in winter, the fresh air blower operating in full heat mode can easily cause frost or condensation accumulation on the heat exchanger. Exhaust mode reduces the risk of freezing damage to the heat exchanger and extends its service life.

[0035] It should be noted that the controller is preset with a first enthalpy difference threshold, a first time threshold, a second time threshold, a third time threshold and a fourth time threshold.

[0036] Optionally, the first enthalpy difference threshold can be customized. For example, the first enthalpy difference threshold can be customized by region, such as 10kJ / kg in southern China and 6kJ / kg in northern China. This addresses the issue of "local incompatibility" with traditional fixed models and avoids efficiency losses caused by a "one-size-fits-all" approach.

[0037] Optionally, the first time threshold, the second time threshold, the third time threshold and the fourth time threshold can all be customized.

[0038] In some embodiments, the first state includes the fan module rotating in a forward direction, and the second state includes the fan module rotating in a reverse direction.

[0039] like Figure 2 As shown, determine the enthalpy difference between indoor and outdoor, including: S110, obtaining outdoor temperature, outdoor humidity, indoor temperature and indoor humidity; S120, determining an outdoor enthalpy value based on the outdoor temperature and the outdoor humidity; determining an indoor enthalpy value based on the indoor temperature and the indoor humidity; S130: Determine the enthalpy difference between indoor and outdoor based on the indoor enthalpy value and the outdoor enthalpy value.

[0040] In this embodiment, by real-time monitoring of indoor and outdoor temperature and humidity and calculating enthalpy, using enthalpy as the core control parameter, compared to traditional single-temperature, single-humidity, or carbon dioxide concentration control methods, this embodiment can coordinate heat and humidity load control to precisely match comfort needs. It can also dynamically adapt to climate differences and improve energy efficiency. This solves the pain points of "over-ventilation" or "under-ventilation" that exist in traditional fresh air fans, achieving technological breakthroughs in comfort, energy efficiency, and reliability.

[0041] In some embodiments, determining the outdoor enthalpy value based on the outdoor temperature and the outdoor humidity includes: Determine the moisture content of the outdoor air based on the outdoor humidity; Based on the humidity content of the outdoor air and the outdoor temperature, the outdoor enthalpy value is determined.

[0042] In some embodiments, determining the indoor enthalpy value based on the indoor temperature and the indoor humidity includes: Determine the moisture content of indoor air based on indoor humidity; The indoor enthalpy value is determined based on the indoor air humidity and indoor temperature.

[0043] Optionally, based on the outdoor humidity, determine the moisture content of the outdoor air, including: Determine the saturated water vapor partial pressure based on the outdoor temperature and the Antoine equation ; Determine the actual water vapor partial pressure according to formula (3) ; Determine the moisture content according to formula (4) .

[0044] Formula (3).

[0045] Formula (4).

[0046] In formula (3), is the air humidity. In formula (4), For atmospheric pressure, the standard atmospheric pressure 101.325 kPa can be taken.

[0047] Optionally, the outdoor enthalpy value is determined based on the humidity content of the outdoor air and the outdoor temperature, including: Using formula (1), combined with the obtained outdoor temperature and outdoor humidity, determine the outdoor enthalpy value; Formula (1).

[0048] In formula (1), is the enthalpy of air. is the constant-pressure specific heat capacity of air, which can be taken as 1.006 kJ / (kg·℃). is the air temperature in °C. is the constant-pressure specific heat capacity of water vapor, which can be taken as 1.86 kJ / (kg·℃). It is the moisture content, that is, the content of water vapor in the air, and its unit is kg / kg.

[0049] In some embodiments, the controller can calculate the outdoor air enthalpy value and indoor air enthalpy , and combined with formula (2) to determine the enthalpy difference .

[0050] Formula (2).

[0051] In some embodiments, the controller can quickly determine the corresponding moisture content through a pre-stored psychrometric chart of air and the acquired air humidity.

[0052] In some embodiments, after determining the enthalpy difference between indoors and outdoors, the method further includes: When the enthalpy difference exceeds the second enthalpy difference threshold, the fresh air fan is controlled to operate in exhaust mode and the air conditioner is activated simultaneously; the second enthalpy difference threshold is greater than the first enthalpy difference threshold. This design, which activates the air conditioner in conjunction with the higher enthalpy difference threshold (the second enthalpy difference threshold), achieves an optimal balance between energy efficiency, comfort, and equipment protection in extreme climate conditions through multi-system coordinated control.

[0053] It should be noted that when the enthalpy difference is greater than the first enthalpy value threshold and not greater than the second enthalpy difference threshold, the fresh air fan is controlled to operate in exhaust mode, and the air conditioner may not be started at this time.

[0054] Optionally, the air conditioner can operate in at least one of a dehumidification mode, a cooling mode and a heating mode when it is started.

[0055] In some embodiments, before the wind turbine module operates in the first state, the method further includes: Obtain indoor carbon dioxide concentration and fresh air carbon dioxide concentration; When the indoor carbon dioxide concentration exceeds the appropriate concentration threshold, the rotational speed of the fan module when operating in the first state is determined based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration.

[0056] When the indoor carbon dioxide concentration does not exceed the appropriate concentration threshold, when the fan module operates in the first state, the speed of the fan module is controlled to remain unchanged.

[0057] In this embodiment, by introducing the carbon dioxide concentration to dynamically adjust the speed of the fan module, the ventilation efficiency, energy consumption and air quality of the fresh air fan can be further optimized; excessive ventilation or insufficient ventilation can be avoided, and ventilation on demand can be achieved.

[0058] Optionally, if the indoor carbon dioxide concentration is less than the minimum value of the appropriate concentration threshold range, the fan module, when operating in the first state, controls the fan module to maintain the current speed. If the indoor carbon dioxide concentration exceeds the maximum value of the appropriate concentration threshold range, the fan module, when operating in the first state, adjusts the fan module speed based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration.

[0059] In this embodiment, if the indoor CO2 concentration is less than the minimum value of the appropriate concentration threshold range, indicating sufficient ventilation or occupancy, the fan module maintains its current speed to avoid unnecessary increases in air volume and prevent temperature and humidity fluctuations caused by excessive ventilation. If the indoor CO2 concentration exceeds the maximum value of the appropriate concentration threshold range, indicating insufficient ventilation or a sudden increase in the number of people in the room, the fan module is controlled to increase its speed to increase the amount of fresh air introduced and improve user comfort.

[0060] It should be noted that the controller pre-stores an appropriate concentration threshold range, which may be 400 ppm to 500 ppm.

[0061] In some embodiments, determining the rotational speed of the fan module when operating in the first state based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration includes: Determine the fresh air volume based on the relationship between indoor carbon dioxide concentration and fresh air carbon dioxide concentration; Based on the corresponding relationship between the fresh air volume and the rotational speed, the rotational speed of the fan module when operating in the first state is determined.

[0062] In this embodiment, the rotation speed of the fan module when operating in the first state can be further accurately controlled to further optimize ventilation efficiency and energy consumption control.

[0063] Furthermore, based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration, the fresh air volume is determined, including: The fresh air volume is determined based on the indoor carbon dioxide concentration, the fresh air carbon dioxide concentration, and the carbon dioxide generation rate.

[0064] Optionally, the fresh air volume is determined based on the indoor carbon dioxide concentration, the fresh air carbon dioxide concentration, and the carbon dioxide generation rate, including: Determine the carbon dioxide concentration difference based on the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration; The fresh air volume is determined based on the relationship between the indoor carbon dioxide generation rate and the carbon dioxide concentration difference.

[0065] In this embodiment, the difference in carbon dioxide concentration can be used to reflect the current indoor pollution level, enabling ventilation based on the pollution level. Combined with the indoor carbon dioxide generation rate, ventilation can be provided based on the number of people, dynamically matching the intensity of the pollution source.

[0066] Optionally, the fresh air volume is determined by the ratio of the indoor carbon dioxide generation rate to the carbon dioxide concentration difference.

[0067] Optionally, the carbon dioxide generation rate in the room is the product of the number of people in the room and the carbon dioxide generation rate of a single person.

[0068] Optionally, the fresh air volume can be determined by formula (5).

[0069] Formula (5).

[0070] In formula (5), is the fresh air volume, in m 3 / h. G is the generation rate of indoor carbon dioxide, unit is L / s. is the indoor carbon dioxide concentration in ppm. It is the fresh air carbon dioxide concentration in ppm.

[0071] Optionally, a correspondence table between fresh air volume and rotation speed is pre-stored in the controller. When the fresh air volume is obtained, the controller can obtain the corresponding rotation speed through the relationship table, and then control the fan module to run at the corresponding rotation speed.

[0072] like Figure 3 As shown, the second aspect of the present invention provides a control device for a fresh air fan. The control device for the fresh air fan includes an enthalpy difference determination module and a mode control module. The enthalpy difference determination module is used to determine the enthalpy difference between indoor and outdoor. The mode control module is used to control the fresh air fan to operate in a full heat mode when the enthalpy difference is not greater than a first enthalpy difference threshold value. It is also used to control the fresh air fan to operate in an exhaust mode when the enthalpy difference is greater than the first enthalpy difference threshold value. In full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; The fan module is used to introduce outdoor fresh air into the room when it operates in the first state, and is used to discharge indoor air to the room when it operates in the second state.

[0073] Optionally, the enthalpy difference determination module includes an information acquisition unit and an enthalpy difference determination unit; the information acquisition unit is used to acquire the temperature and humidity of the air; and the enthalpy difference determination unit is used to determine the indoor and outdoor enthalpy difference based on the temperature and humidity of the air.

[0074] Optionally, the information acquisition unit may be disposed at the fresh air outlet of the fresh air fan. After the fan module operates in the first state for a period of time, the information acquisition unit acquires the outdoor temperature and outdoor humidity. After the fan module operates in the second state for a period of time, the information acquisition unit acquires the indoor temperature and indoor humidity.

[0075] Optionally, the enthalpy difference determination unit is used to determine the outdoor enthalpy value based on the outdoor temperature and outdoor humidity; it is also used to determine the indoor enthalpy value based on the indoor temperature and indoor humidity; it is also used to determine the enthalpy difference between indoor and outdoor based on the indoor enthalpy value and the outdoor enthalpy value.

[0076] Optionally, the information acquisition unit includes a temperature sensor and a humidity sensor. Both the temperature sensor and the humidity sensor are installed at the fresh air outlet of the fresh air fan. After the fan module has been operating in the first state for a period of time, the temperature sensor detects the outdoor temperature, and the humidity sensor detects the outdoor humidity. After the fan module has been operating in the second state for a period of time, the temperature sensor detects the indoor temperature, and the humidity sensor detects the indoor humidity.

[0077] Optionally, the information acquisition unit further includes a carbon dioxide detector disposed at the fresh air outlet of the fresh air blower. After the blower module has operated in the first state for a period of time, the carbon dioxide detector detects the fresh air carbon dioxide concentration. After the blower module has operated in the second state for a period of time, the carbon dioxide detector detects the indoor carbon dioxide concentration.

[0078] In some embodiments, the mode control module is also used to control the fresh air fan to operate in exhaust mode while also controlling the air conditioner to start when the enthalpy difference is greater than a second enthalpy difference threshold; the second enthalpy difference threshold is greater than the first enthalpy difference threshold.

[0079] In some embodiments, the mode control module is also used to obtain the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration before the fan module operates in the first state; when the indoor carbon dioxide concentration exceeds the appropriate concentration threshold, the speed of the fan module when operating in the first state is determined based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration.

[0080] A third aspect of the present invention provides a fresh air fan. This fresh air fan is controlled using the fresh air fan control method provided in any of the above embodiments. The fresh air fan of this embodiment includes a housing, a heat exchange core, and a fan module. The housing has an interior having an installation cavity; the heat exchange core is disposed in the installation cavity for storing and releasing heat; the fan module is disposed in the installation cavity and is located on one side of the heat exchange core; the fan module includes a first state and a second state; in the first state, the fan module is used to introduce outdoor fresh air into the room; in the second state, the fan module is used to direct indoor air to the outside.

[0081] In some embodiments, the fan module includes a first fan disposed on one side of the heat exchange core. The first fan can rotate in either a forward or reverse direction. When rotating in a forward direction, the first fan draws outdoor fresh air into the room; when rotating in a reverse direction, the first fan draws indoor air outdoors.

[0082] In some embodiments, the fan module includes an exhaust fan and an exhaust fan, each disposed on opposite sides of the heat exchange core. In a first state, the exhaust fan rotates forward to draw fresh air into the room, while the exhaust fan is stopped. In a second state, the exhaust fan rotates forward to exhaust indoor air, while the exhaust fan is stopped.

[0083] In some embodiments, the fresh air fan is a single-channel fresh air fan.

[0084] The following combination Figures 5 to 10 The heat exchange core provided by the present invention is described in detail.

[0085] like Figures 5 to 10 As shown, a specific embodiment of the first aspect of the present invention provides a heat exchange core. The heat exchange core includes a plurality of silicon carbide ceramic units 110; the plurality of silicon carbide ceramic units 110 are periodically arranged to form the heat exchange core; the silicon carbide ceramic units 110 have a hexagonal cross-section; and the silicon carbide ceramic units 110 have flow channels 101 formed along their axial directions.

[0086] In this embodiment, the thermal conductivity of silicon carbide ceramics is significantly higher than that of traditional metals (such as stainless steel) or plastics, enabling rapid heat transfer and reducing thermal resistance, thereby increasing the heat exchange rate between hot and cold fluids. Silicon carbide maintains stable performance in high temperatures and corrosive environments, avoiding efficiency degradation due to material degradation. The high mechanical strength of silicon carbide ceramics allows for thinner wall thicknesses in the flow channels 101, further reducing thermal resistance. The hexagonal structure of the silicon carbide ceramic units 110 enables dense honeycomb packing, creating more flow channels 101 per unit volume. This significantly increases the contact area between the fluid (such as air or liquid) and the silicon carbide ceramic units, enhancing heat transfer. The periodic structure evenly distributes heat throughout the heat exchange core, preventing local overheating or overcooling and fully utilizing all heat exchange units. The periodic design allows for flexible expansion of the heat exchange area as needed without affecting the heat transfer efficiency at any single point. In summary, the heat exchange core of this embodiment achieves a comprehensive improvement in heat exchange efficiency through the high thermal conductivity of silicon carbide ceramics, the high specific surface area of ​​its hexagonal close-packed structure, the low-resistance and efficient heat transfer of the axial flow channels 101, and the optimized thermal field of its periodic arrangement. This addresses the issue of heat exchange efficiency remaining to be improved in existing heat exchange cores. Furthermore, combined with fresh air blower testing, the heat exchange efficiency of this embodiment reached 95% at the same air volume, a 5 percentage point improvement compared to existing heat exchange cores.

[0087] like Figures 5 to 8As shown, in some embodiments, the flow channel 101 is spiral. The spiral flow channel 101 significantly extends the flow path of the fluid (such as air or liquid) within the silicon carbide ceramic unit 110, allowing more time for heat transfer between the hot and cold fluids, thereby improving heat exchange efficiency. Centrifugal force acts on the hot and cold fluids in the spiral flow channel 101, generating secondary flow, disrupting the laminar boundary layer and reducing thermal resistance. The fluid rotation caused by the spiral structure promotes radial mixing of the hot and cold fluids, resulting in a more uniform temperature distribution and improved heat transfer efficiency. The spiral flow channel 101 achieves a longer heat transfer path within a limited space, making it more compact than a straight axial flow channel 101. The rotational motion of the fluid in the spiral flow channel 101 reduces particle deposition on the wall, delays fouling, and maintains efficient heat transfer over time. The high strength of silicon carbide ceramics allows the spiral flow channel 101 to have a smaller radius of curvature, further increasing the density of the flow channel 101 without cracking.

[0088] like Figure 9 As shown, in some other embodiments, two flow channels 101 are provided along the silicon carbide ceramic unit 110 along its axis. The two flow channels 101 are arranged side by side and partially overlap to form a flow channel with an "8"-shaped cross-section. Compared with a single flow channel, this can further improve heat exchange efficiency. The narrow connection in the middle of the "8" shape forces the fluid to accelerate as it passes through, generating local vortices, destroying the thermal boundary layer, and reducing thermal resistance.

[0089] In some embodiments, one end of the flow channel 101 is an air inlet 102 , and the other end is an air outlet 103 ; the aperture of the air inlet 102 is larger than the aperture of the air outlet 103 .

[0090] In this embodiment, the large-aperture air inlet 102 can reduce the initial fluid velocity, prolong the fluid's residence time within the flow channel 101, ensure sufficient heat (or cold) storage, and reduce inlet pressure loss. The small-aperture air outlet 103 accelerates the fluid by shrinking its cross-sectional area, thereby enhancing flow interruption, thinning the thermal resistance boundary layer, improving the heat transfer coefficient, enhancing heat exchange efficiency, and preventing the deposition of particulate matter in the fluid.

[0091] Optionally, the aperture of flow channel 101 gradually decreases from air inlet 102 to air outlet 103. This tapered structure converts air pressure energy into kinetic energy. The high-speed air at the outlet naturally draws in surrounding air, flushing the walls of flow channel 101 and reducing particle deposition. By converting pressure into kinetic energy, the tapered flow channel 101 reduces the external power required by the system and can lower fan power.

[0092] Optionally, the ratio D of the aperture D1 of the air inlet 102 to the aperture D2 of the air outlet 103 is (1-3):(0.5-1.5). By more precisely controlling the contraction ratio of the flow channel 101 cross section, an optimal balance can be achieved between aerodynamic performance, heat exchange efficiency, and system reliability. This improves heat exchange efficiency while ensuring the mechanical strength of the device and reducing the risk of fracture of the silicon carbide ceramic unit.

[0093] Optionally, the ratio D of the aperture D1 of the air inlet 102 to the aperture D2 of the air outlet 103 is 2: 1. This can increase the Reynolds number of the air, thereby significantly improving the heat exchange efficiency and reducing the power of the fan.

[0094] For example, the aperture D1 of the air inlet 102 is 0.67 mm, and the aperture D2 of the air outlet 103 is 0.33 mm.

[0095] In some embodiments, the silicon carbide ceramic unit 110 has a porous structure with a porosity of 40% to 60%. This porous structure creates micro-scale turbulence through the pores as air flows through the flow channel 101, increasing the effective heat transfer area by 3 to 5 times compared to a dense structure. The macroscopic flow channel 101 is responsible for the main flow, while the micropores of the porous structure enhance localized disturbances, achieving a "macro-micro" dual-stage heat exchange. A porosity of 40% to 60% can also reduce the amount of silicon carbide used, reducing material costs.

[0096] It should be noted that porosity refers to the volume ratio of micropores in silicon carbide ceramics.

[0097] Optionally, the micropores of the silicon carbide ceramic unit 110 have a diameter of 0.1 mm to 1 mm. This increases the heat exchange area while ensuring sufficient air volume, and is less prone to clogging and easier to clean. In summary, controlling the micropore diameter of the silicon carbide ceramic unit 110 within the range of 0.1 mm to 1 mm, combined with a porosity design of 40% to 60%, can further optimize the performance of the heat exchange core at the microscale.

[0098] In some embodiments, the surface of the silicon carbide ceramic unit 110 is covered with an anti-oxidation coating, which can extend the service life of the silicon carbide ceramic unit 110 .

[0099] Optionally, the anti-oxidation coating is a mixed coating of silicon dioxide and aluminum oxide.

[0100] like Figure 10 As shown, in some embodiments, the heat exchange core is cylindrical. This cylindrical structure avoids flow stagnation at right angles or sharp corners, evenly distributing air circumferentially and reducing localized thermal stress and dirt deposition. When subjected to internal pressure, the cylinder maintains uniform distribution of circumferential and axial stresses, eliminating stress concentration points and enhancing the mechanical strength of the heat exchange core.

[0101] It is understood that the heat exchange core can be formed in one piece. For example, the heat exchange core can be prepared by sintering.

[0102] For example, based on the structure of the heat exchange core, engineering drawings are drawn and a three-dimensional model is constructed. Silicon carbide powder is mixed with graphene spheroidal graphite to produce a mixture, in which the graphene accounts for approximately 5% by weight. The three-dimensional model is input into an additive manufacturing device, and the mixture is loaded into the additive manufacturing device hopper, and the silicon carbide ceramic body is manufactured using additive manufacturing technology. Next, after cleaning the body, it is pre-treated using a baking process and a pre-sintering process to obtain a pre-sintered body. Finally, the pre-sintered body is placed in a vacuum furnace or an atmosphere furnace and sintered at high temperature to obtain the heat exchange core.

[0103] Figure 4 An example of a physical structure diagram of an electronic device is shown below. Figure 4 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the fresh air blower, which includes: Determine the enthalpy difference between indoors and outdoors; When the enthalpy difference is not greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in a full heat mode; When the enthalpy difference is greater than the first enthalpy difference threshold, controlling the fresh air fan to operate in exhaust mode; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

[0104] Furthermore, the logic instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0105] On the other hand, the present invention further provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can perform the control method of the fresh air fan provided by the above methods, which includes: Determine the enthalpy difference between indoors and outdoors; When the enthalpy difference is not greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in a full heat mode; When the enthalpy difference is greater than the first enthalpy difference threshold, controlling the fresh air fan to operate in exhaust mode; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

[0106] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the control method for the fresh air fan provided by the above methods is implemented, and the method includes: Determine the enthalpy difference between indoors and outdoors; When the enthalpy difference is not greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in a full heat mode; When the enthalpy difference is greater than the first enthalpy difference threshold, controlling the fresh air fan to operate in exhaust mode; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

[0107] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0108] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A control method for a fresh air blower, characterized in that: include: Determine the enthalpy difference between indoors and outdoors; When the enthalpy difference is not greater than a first enthalpy difference threshold, controlling the fresh air fan to operate in a full heat mode; When the enthalpy difference is greater than the first enthalpy difference threshold, controlling the fresh air fan to operate in exhaust mode; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

2. The control method of the fresh air blower according to claim 1, characterized in that: After determining the enthalpy difference between indoor and outdoor, the method further includes: When the enthalpy difference is greater than the second enthalpy difference threshold, the fresh air fan is controlled to operate in the exhaust mode while the air conditioner is also controlled to start; the second enthalpy difference threshold is greater than the first enthalpy difference threshold.

3. The control method of the fresh air blower according to claim 1, characterized in that: Before the fan module operates in the first state, the method further includes: Obtain indoor carbon dioxide concentration and fresh air carbon dioxide concentration; When the indoor carbon dioxide concentration exceeds an appropriate concentration threshold, the rotational speed of the fan module when operating in the first state is determined based on a relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration.

4. The control method of the fresh air blower according to claim 3, characterized in that: The determining, based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration, the rotational speed of the fan module when operating in the first state includes: Determining the fresh air volume based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration; Based on the corresponding relationship between the fresh air volume and the rotational speed, the rotational speed of the fan module when operating in the first state is determined.

5. The control method of the fresh air blower according to claim 4, characterized in that: The determining of the fresh air volume based on the relationship between the indoor carbon dioxide concentration and the fresh air carbon dioxide concentration includes: The fresh air volume is determined based on the indoor carbon dioxide concentration, the fresh air carbon dioxide concentration, and the generation rate of carbon dioxide.

6. The control method of the fresh air blower according to any one of claims 1 to 5, characterized in that: Determining the enthalpy difference between indoors and outdoors includes: Get outdoor temperature, outdoor humidity, indoor temperature and indoor humidity; determining an outdoor enthalpy value based on the outdoor temperature and the outdoor humidity; determining an indoor enthalpy value based on the indoor temperature and the indoor humidity; An indoor-outdoor enthalpy difference is determined based on the indoor enthalpy value and the outdoor enthalpy value.

7. The control method of the fresh air blower according to claim 6, characterized in that: The first state includes the fan module rotating in a forward direction, and the second state includes the fan module rotating in a reverse direction.

8. A control device for a fresh air blower, characterized in that: include: An enthalpy difference determination module is used to determine the enthalpy difference between indoor and outdoor; a mode control module, configured to control the fresh air fan to operate in a full heat mode when the enthalpy difference is not greater than a first enthalpy difference threshold; for controlling the fresh air fan to operate in exhaust mode when the enthalpy difference is greater than the first enthalpy difference threshold; In the full heat mode, the fan module of the fresh air fan operates in the first state for a first time threshold, and then operates in the second state for a second time threshold; In the exhaust mode, the fan module first operates in the first state for a third time threshold, and then the fan module is downshifted and then operates in the second state for a fourth time threshold, and the third time threshold is not equal to the fourth time threshold; Wherein, when the fan module operates in the first state, it is used to introduce outdoor fresh air into the room; when the fan module operates in the second state, it is used to discharge indoor air to the outside.

9. A new air blower, characterized in that: The control method for the fresh air fan according to any one of claims 1 to 7 is used for control; the fresh air fan comprises: a housing having a mounting cavity therein; A heat exchange core is arranged in the installation cavity and is used for storing and releasing heat; A fan module is disposed in the installation cavity and located on one side of the heat exchange core; the fan module includes a first state and a second state; In the first state, the fan module is used to introduce outdoor fresh air into the room; in the second state, the fan module is used to exhaust indoor air to the outside.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the control method of the fresh air fan according to any one of claims 1 to 7 is implemented.

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