Energy-saving fresh air system with independent compressor

Abstract

The invention relates to the technical field of energy-saving type fresh air systems, and discloses an energy-saving type fresh air system with an independent compressor, which comprises a fresh air inner unit, an independent variable-frequency compressor unit and a cooperative control module, the fresh air inner unit is sequentially provided with an air inlet section, a filtering section, a heat exchange section, a humidifying section and an air supply section along the fresh air flow direction; wherein the heat exchange section and the humidifying section are structurally integrated; the independent variable-frequency compressor unit is an exclusive configuration of the fresh air indoor unit and forms heat exchange association with a heat exchange section of the fresh air indoor unit, the independent variable-frequency compressor unit and the fresh air indoor unit form an independent closed-loop operation loop, and the independent closed-loop operation loop is not connected with a main compressor, an indoor unit and an outdoor unit of the multi-split air conditioning system. Complete decoupling of the fresh air system and the multi-split air conditioning system is achieved. The technical problems that an existing fresh air system and a multi-split air conditioning system are high in coupling degree, cannot operate independently and stably, are high in energy consumption and are difficult to meet the requirements for indoor air quality and comfort are solved.

Description

Technical Field

[0001] This invention relates to the field of energy-saving fresh air system technology, specifically to an energy-saving fresh air system with an independent compressor. Background Technology

[0002] As people's demands for indoor air quality and living comfort continue to rise, fresh air systems have become core equipment for building ventilation and improving indoor air quality. They not only effectively replace indoor and outdoor air but also need to regulate temperature and humidity to ensure that the fresh air delivered indoors meets comfort requirements. Currently, most fresh air systems on the market share the main compressor and heat exchange circuit with multi-split air conditioning systems, lacking dedicated compressor units. The operation of the fresh air system is entirely dependent on the start-up, shutdown, and regulation of the multi-split air conditioning system, creating a strong coupling between the two.

[0003] The aforementioned existing technical solutions have many drawbacks: Firstly, the fresh air system cannot operate independently. When the multi-split air conditioning system shuts down due to the indoor temperature reaching the preset value, the fresh air system also needs to shut down simultaneously, resulting in the inability to continuously supply the indoor air with temperature and humidity regulated fresh air. If the multi-split air conditioning system is forcibly turned on to ensure the supply of fresh air, it will result in an inefficient "oversized engine running on a small vehicle" situation, significantly increasing energy consumption and keeping maintenance costs high. Secondly, since the fresh air system and the multi-split air conditioning system share the same heat exchange circuit, their operating parameters interfere with each other, making it difficult to guarantee the temperature and humidity regulation accuracy of the fresh air system. This can easily lead to excessive fluctuations in the supply air temperature and humidity, affecting the comfort of the indoor environment.

[0004] Meanwhile, in existing fresh air systems, the heat exchange section and humidification section are mostly independently designed, lacking functional coordination and resulting in low efficiency in temperature and humidity regulation. Specifically, the heat exchange section is only responsible for regulating the temperature of the fresh air, and the humidification section is only responsible for regulating the humidity. The heat generated by the heat exchange section cannot provide effective energy support for the evaporation of water in the humidification section, resulting in energy waste. Furthermore, since the humidification section and heat exchange section are independent, they cannot increase the heat exchange contact area through structural coordination, which limits the temperature regulation effect of the heat exchange section and leads to low overall efficiency in the joint regulation of fresh air temperature and humidity.

[0005] In summary, existing fresh air systems have technical problems such as high coupling with multi-split air conditioning systems, inability to operate independently and stably, high energy consumption, low temperature and humidity regulation efficiency, and insufficient control precision. There is an urgent need for a fresh air system technical solution that can solve the above problems. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an energy-saving fresh air system with an independent compressor. This system offers advantages such as independent and stable operation of fresh air, reduced energy consumption, improved temperature and humidity regulation efficiency and control precision, and ensures a comfortable indoor environment. It solves the technical problems of existing fresh air systems being highly coupled with multi-split air conditioning systems, unable to operate independently and stably, having high energy consumption, lacking coordination between the heat exchange and humidification sections, having low temperature and humidity regulation efficiency, and insufficient control precision, making it difficult to meet indoor air quality and comfort requirements.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An energy-saving fresh air system with an independent compressor includes a fresh air indoor unit, an independent variable frequency compressor unit, and a collaborative control module. The fresh air indoor unit is arranged sequentially along the fresh air flow direction, including an air inlet section, a filtration section, a heat exchange section, a humidification section, and an air supply section, wherein the heat exchange section and the humidification section are structurally integrated together. The independent variable frequency compressor unit is a dedicated configuration for the fresh air indoor unit and forms a heat exchange association with the heat exchange section of the fresh air indoor unit. The independent variable frequency compressor unit and the fresh air indoor unit form an independent closed-loop operating circuit. The independent closed-loop operating circuit does not form any connection relationship with the main compressor, indoor unit, and outdoor unit of the multi-split air conditioning system, thereby achieving complete decoupling between the fresh air system and the multi-split air conditioning system.

[0008] Preferably, the air supply section is equipped with a temperature detection unit and a humidity detection unit, and the collaborative control module is connected to the temperature detection unit, the humidity detection unit, the independent variable frequency compressor unit, and the humidification component of the humidification section. The collaborative control module is used to collect the actual temperature and humidity of the air supply section, compare them with the preset temperature and preset humidity, and adjust the output frequency of the independent variable frequency compressor unit and the water filling speed of the humidification component to achieve accurate matching of the preset temperature and humidity of the air supply section.

[0009] Preferably, a preheating module is integrated between the air inlet section and the filter section. A temperature sensor is installed in the air inlet section. The collaborative control module collects the temperature in the air inlet section and controls the preheating module to start heating when the air inlet temperature is lower than the preset compensation temperature, while controlling the compressor power to increase slowly. A return air module is installed on the side wall of the fresh air unit to guide a portion of the fresh air after passing through the heat exchange section and humidification section back to the filter section. Thus, after the compressor power reaches the target, the collaborative control module controls the preheating module to shut down. At this time, the return air module is used to keep the filter section warm and also prevents water vapor in the humidification section from condensing due to the low temperature of the fresh air.

[0010] Preferably, the return air module includes a return air duct, which includes a rear air outlet located after the heat exchange section and the humidification section, and a front air outlet located in front of the filtration section. The filtration section contains a front filter, a middle filter, and a rear filter arranged sequentially along the air inlet direction. The front filter includes a front filter plate with pre-drilled holes. The front air outlet passes through the pre-drilled holes and communicates with the middle filter. The middle filter includes multiple labyrinthine middle filter plates. The rear filter includes a rear filter plate, and the pore size of the rear filter is smaller than that of the front filter. When the filtration section is not blocked, the fresh air, after being heated by the heat exchange section, passes through the rear air outlet, the return air duct, and the front air outlet before directly entering the labyrinthine middle filter. When the middle and rear filters are blocked, the fresh air can be temporarily ventilated through the return air duct.

[0011] Preferably, the intermediate filter plate is shaped as a corrugated plate, and the intermediate filter plates are staggered to form a Z-shaped meandering maze channel. At the same time, evenly distributed guide holes are opened at the crests and troughs of the corrugated plate.

[0012] Preferably, the preheating module is an electric heating wire heating tube, and the preheating module is located between the air inlet section and the filter section, closer to the air inlet section.

[0013] Preferably, the return air duct is installed and fixed on the side wall of the fresh air indoor unit, and the rear air outlet includes a guide plate. The guide plate intercepts a portion of the airflow after passing through the heat exchange section and guides it into the return air duct. The guide plate is installed and fixed on the side wall of the fresh air indoor unit, and the side wall of the fresh air indoor unit has a through hole in front of the guide plate for connecting the return air duct and the rear air outlet. The front air inlet includes an air guide pipe, the two ends of which are respectively sealed and connected to the return air channel and the middle filter section.

[0014] Preferably, the guide vane is an angle-adjustable arc-shaped structure, the guide vane is equipped with a stepper motor, the stepper motor is signal-connected to the collaborative control module, and the collaborative control module adjusts the angle of the guide vane according to the deviation between the inlet air temperature and the outlet air temperature to control the return air ratio to be 10% to 30%.

[0015] Preferably, the pre-filter, middle filter, and post-filter of the filter section all adopt a drawer-type detachable structure. The fresh air indoor unit housing is provided with a magnetic maintenance door corresponding to the position of the filter section. A sealing strip is provided on the inner side of the maintenance door. A differential pressure sensor is provided in the filter section to detect the air pressure difference between the pre-filter and the post-filter. The differential pressure sensor is connected to the collaborative control module.

[0016] Preferably, the core of the collaborative control module consists of a main control chip, a signal acquisition module, a drive module, a communication module, and a power supply module.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides an energy-saving fresh air system with an independent compressor, which has the following beneficial effects: 1. This energy-saving fresh air system with an independent compressor completely decouples the fresh air system from the multi-split air conditioning system by independently configuring a variable frequency compressor unit for the fresh air system. Furthermore, the heat exchange section and humidification section are structurally integrated and functionally complementary. First, it achieves independent and stable operation of the fresh air system, forming an independent closed-loop circuit. Second, it reduces operating energy consumption and saves maintenance costs, as the independent variable frequency compressor unit precisely matches the fresh air operating power, avoiding the inefficiency of traditional products with excessive power for insufficient capacity. Third, it improves the stability of constant temperature and humidity, ensuring environmental comfort. Low energy consumption supports 24-hour uninterrupted system operation, avoiding temperature and humidity fluctuations caused by frequent start-ups and shutdowns due to high energy consumption. Finally, it achieves precise and coordinated temperature and humidity regulation. The heat exchange section and humidification section complement each other, and the coordinated control module adjusts the compressor frequency and humidification speed based on the temperature and humidity data of the air supply section, adapting to different deviation scenarios and ensuring that the fresh air parameters meet preset requirements.

[0018] 2. This energy-saving fresh air system with an independent compressor integrates the heat exchange section and humidification section, and collects temperature and humidity data within the air supply section. Firstly, it achieves highly efficient synergy in fresh air temperature and humidity regulation. After the heat exchange and humidification sections are integrated, the heat released by the heat exchange section directly provides energy support for water evaporation in the humidification section. Simultaneously, the water film formed by the humidification section increases the heat exchange contact area, enhancing the temperature regulation effect of the heat exchange section. These two functions complement each other, significantly improving the efficiency of joint regulation of fresh air temperature and humidity. Secondly, it achieves precise control of air supply temperature and humidity. As the final point where fresh air is delivered into the room, the air supply section directly reflects the final air supply effect when its temperature and humidity data are collected. The collaborative control module compares this core data with preset values, precisely adjusting the compressor output frequency and the water filling speed of the humidification components. It can correct temperature and humidity deviations in real time, ensuring that the parameters of the fresh air delivered into the room always meet preset standards, guaranteeing indoor environmental comfort.

[0019] 3. This energy-saving fresh air system with an independent compressor utilizes a preheating module between the air intake and filtration sections, and a return air module on the indoor unit. Firstly, the preheating module reduces compressor load and improves operational stability. Preheating raises the temperature of the low-temperature fresh air, preventing the large temperature difference load that would occur if the low-temperature airflow directly entered the heat exchange section and exchanged heat with the refrigerant. Secondly, it improves filtration efficiency. Increased temperature increases the activity of water vapor molecules in the air, making them less likely to condense on the filter surface, thus preventing dust buildup and filter clogging. This ensures stable filter permeability. Increased temperature also enhances the thermal motion of particulate matter, making it easier for them to collide and adhere to the filter fibers. Heating also reduces the viscosity of particulate matter, decreasing its probability of penetrating the filter. Finally, it prevents water vapor condensation in the humidification section, ensuring stable humidity. The preheated fresh air temperature is within a suitable range, preventing instantaneous condensation of water vapor into droplets due to excessive temperature differences when it comes into contact with water vapor in the humidification section.

[0020] 4. This energy-saving fresh air system with an independent compressor allows the return air module's front air inlet to directly pass through the pre-filter section of the filter section. First, the return air in the return air module can directly penetrate the middle filter section, improving the heating of the filter section. Second, the side airflow generated by the return air module will disrupt the original airflow in the filter section, making the filtration more uniform. Finally, the return air duct under this structure can also provide temporary ventilation when the middle filter section is blocked.

[0021] 5. This energy-saving fresh air system with an independent compressor, by setting the middle filter plate as a corrugated plate and setting small guide holes on the middle filter plate, firstly eliminates airflow dead zones, improves filtration efficiency and uniformity. The Z-shaped channels formed by the interlacing corrugated plates can guide the airflow to flow smoothly and meanderingly. Combined with the cross-channel permeation effect of the middle filter section, it forms multi-directional disturbance with the main airflow, reduces vortex dead zones, and increases the contact area between particles and filter plate fibers, resulting in more uniform filtration. It can also avoid local dust accumulation and slow down the clogging speed. Secondly, it reduces ventilation resistance. To ensure adequate emergency ventilation, the corrugated structure, combined with the diversion effect of the guide holes, increases the fresh air throughput. Simultaneously, it enhances the return air heating effect and drainage to prevent condensation. The corrugated structure of the filter plate increases the contact area with the preheated return airflow, and the meandering channels extend the airflow residence time, improving heat exchange efficiency and resulting in a more uniform overall temperature in the filtration section. Finally, the troughs of the middle filter plate naturally form water channels, allowing any small amount of condensed water to drain along these channels, preventing water droplets from accumulating and soaking the filter screen, further ensuring filter performance and humidity regulation stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a system according to Embodiment 1 of the present invention.

[0023] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the indoor air unit of Embodiment 1 of the present invention.

[0024] Figure 3 This is a schematic plan view of the internal structure of the fresh air indoor unit in Embodiment 1 of the present invention.

[0025] Figure 4 This is a three-dimensional schematic diagram of the internal structure of the fresh air indoor unit according to Embodiment 1 of the present invention.

[0026] Figure 5 This is a three-dimensional schematic diagram of the heat exchange section and humidification section structure according to Embodiment 1 of the present invention.

[0027] Figure 6 This is a three-dimensional schematic diagram of the filtration section, heat exchange section, and humidification section of Embodiment 2 of the present invention.

[0028] Figure 7 This is a cross-sectional schematic diagram of the filtration section, heat exchange section, and humidification section of Embodiment 2 of the present invention.

[0029] Figure 8 This is an exploded view of the filter section in Embodiment 2 of the present invention.

[0030] Figure 9 This is a three-dimensional schematic diagram of the filter plate structure in Embodiment 2 of the present invention.

[0031] In the diagram: 1. Air intake section; 11. Outdoor fresh air inlet; 2. Filtration section; 21. Pre-filter section; 22. Middle filter section; 23. Post-filter section; 211. Pre-filter plate; 212. Reserved hole; 221. Middle filter plate; 222. Guide hole; 231. Post-filter plate; 3. Heat exchange section; 31. Heat exchange tube; 4. Humidification section; 40. Water tank; 41. Water inlet; 42. Water supply pump; 43. Spray pump; 44. Spray tank; 45. Drain pump; 46. Drain outlet; 5. Air supply section; 51. Centrifugal fan; 52. Indoor fresh air inlet; 6. Electrical warehouse; 7. Preheating module; 8. Return air module; 80. Return air duct; 81. Rear air vent; 82. Front air vent. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0033] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] Example 1: This embodiment provides an energy-saving fresh air system with an independent compressor, which has the following technical features.

[0037] Please see Figure 1-4 An energy-saving fresh air system with an independent compressor includes a fresh air indoor unit, an independent variable frequency compressor unit and a collaborative control module. The fresh air indoor unit is arranged in sequence along the fresh air flow direction as an air inlet section 1, a filter section 2, a heat exchange section 3, a humidification section 4 and an air supply section 5, wherein the heat exchange section 3 and the humidification section 4 are structurally integrated together. The independent variable frequency compressor unit is a dedicated configuration for the fresh air indoor unit and forms a heat exchange connection with the heat exchange section 3 of the fresh air indoor unit. The independent variable frequency compressor unit and the fresh air indoor unit form an independent closed-loop operation circuit. The independent closed-loop operation circuit does not form any connection relationship with the main compressor, indoor unit and outdoor unit of the multi-split air conditioning system, realizing the complete decoupling of the fresh air system and the multi-split air conditioning system.

[0038] This energy-saving fresh air system with an independent compressor completely decouples the fresh air system from the multi-split air conditioning system by configuring an independent variable frequency compressor unit for the fresh air system. Furthermore, the heat exchange section 3 and humidification section 4 are structurally integrated and functionally complementary. Firstly, it achieves independent and stable operation of the fresh air system, forming an independent closed-loop circuit. Secondly, it reduces operating energy consumption and saves maintenance costs, as the independent variable frequency compressor unit precisely matches the fresh air operating power, avoiding the inefficiency of traditional products that are overpowered. Thirdly, it improves the stability of constant temperature and humidity, ensuring environmental comfort. Low energy consumption supports 24-hour uninterrupted system operation, avoiding temperature and humidity fluctuations caused by frequent start-ups and shutdowns due to high energy consumption. Finally, it achieves precise and coordinated temperature and humidity regulation. The heat exchange section and humidification section complement each other, and the coordinated control module adjusts the compressor frequency and humidification speed based on the temperature and humidity data of the air supply section, adapting to different deviation scenarios and ensuring that the fresh air parameters meet preset requirements.

[0039] Furthermore, the air intake section 1 is equipped with two outdoor fresh air inlets 11.

[0040] Furthermore, at least one indoor fresh air inlet 52 is provided in the air supply section 5, and a centrifugal fan 51 is provided in the air supply section 5, with the centrifugal fan 51 connected to the indoor fresh air inlet 52.

[0041] Furthermore, the air supply section 5 is equipped with an electrical compartment 6 for installing circuit boards.

[0042] In an optional embodiment, the air supply section 5 is equipped with a temperature detection unit and a humidity detection unit, and the collaborative control module is connected to the temperature detection unit, the humidity detection unit, the independent variable frequency compressor unit, and the humidification component of the humidification section 4 respectively. The collaborative control module is used to collect the actual temperature and humidity of the air supply section 5 and compare them with the preset temperature and humidity, thereby adjusting the output frequency of the independent variable frequency compressor unit and the water filling speed of the humidification component to achieve precise matching of the preset temperature and humidity of the air supply section 5.

[0043] This energy-saving fresh air system with an independent compressor integrates the heat exchange section 3 and the humidification section 4, and collects temperature and humidity data within the air supply section 5. Firstly, it achieves highly efficient synergy in fresh air temperature and humidity regulation. After the heat exchange section 3 and humidification section 4 are integrated, the heat released by the heat exchange section 3 directly provides energy support for the water evaporation in the humidification section 4. Simultaneously, the water film formed by the humidification section 4 increases the heat exchange contact area, enhancing the temperature regulation effect of the heat exchange section 3. These two functions complement each other, significantly improving the efficiency of joint regulation of fresh air temperature and humidity. Secondly, it achieves precise control of air supply temperature and humidity. As the final point for fresh air delivery into the room, the air supply section 5 directly reflects the final air supply effect when its temperature and humidity data are collected. The collaborative control module compares this core data with preset values, precisely adjusting the compressor output frequency and the water filling speed of the humidification components. It can correct temperature and humidity deviations in real time, ensuring that the parameters of the fresh air delivered into the room always meet preset standards, guaranteeing indoor environmental comfort.

[0044] Furthermore, the humidification component includes a water supply mechanism, which sprays water onto the heat exchange tubes 31 of the heat exchange section 3. The heat from the heat exchange tubes 31 causes the water to evaporate, thereby increasing the humidity of the fresh air. The water supply mechanism includes a water tank 40, which contains a water supply pump 42, a water spraying pump 43, and a drain pump 45. The heat exchange section 3 is located on the water tank 40. The inlet of the water supply pump 42 is connected to the water supply port 41, the outlet of the water spraying pump 43 is connected to the water spraying tank 44 above the heat exchange section 3, and the outlet of the drain pump 45 is connected to the drain outlet 46. The inlets of the water spraying pump 43, the outlets of the water supply pump 42 and the drain pump 45 are connected to the water tank 40. The water tank 40 also contains a high and low water level detection module. The water spraying pump 43 is controlled by a collaborative control module.

[0045] It should be noted that the water supply pump 42 replenishes clean water into the water tank 40 through the water supply port 41, and the water spray pump 43 pumps water from the water tank 40 to the water spray box 44 in real time. The bottom of the water spray box 44 is provided with multiple water leakage holes. The water in the water spray box 44 drips onto the heat exchange tube 31 in the heat exchange section 3 through the water leakage holes. The heat generated by the heat exchange tube 31 evaporates the water, thereby humidifying it. When the airflow passes through the heat exchange section 3, it can both heat and humidify. When humidifying in winter, if the water level in the water tank 40 is lower than the preset replenishment level, the low water level detection module will detect it and replenish the water level through the replenishment pump 42. When humidification is not required in summer, the water tank 40 collects the condensate generated by the heat exchange tube 31. If the water level in the water tank 40 is higher than the preset drainage level, the high water level detection module will detect it and discharge the condensate from the drain outlet 46 through the drain pump 45.

[0046] Specifically, the high and low water level detection module includes a high water level sensor and a low water level sensor. The high water level sensor is fixed at 85% height of the inner wall of the water tank 40, and the low water level sensor is fixed at 25% height of the inner wall of the water tank 40. The bottom of the water tank 40 is provided with an inclined guide surface with an inclination angle of 5°-8°, and the inlet of the drain pump 45 is located at the lowest end of the inclined guide surface.

[0047] Specifically, both the drain outlet 46 and the water inlet 41 are located on the casing of the fresh air unit.

[0048] It should be noted that since the compressor controls the heat of the heat exchanger, the heat of the heat exchanger not only affects the temperature of the air supply, but also the rate of water evaporation in the humidification section, which in turn affects the humidity of the air supply. The temperature and humidity of the air supply section are detected and compared with the preset values.

[0049] Specifically, if both temperature and humidity are too low, the compressor frequency is increased to raise both simultaneously; if temperature is too low and humidity is too high, the water pump power is reduced to lower humidity while raising temperature; if temperature is too high and humidity is too low, the water pump power is increased to raise humidity while raising temperature; if both temperature and humidity are too high, the water pump power is reduced to lower both simultaneously; if temperature is within the acceptable range but humidity is too low, the water pump power is increased and the compressor frequency is appropriately increased to keep temperature constant while lowering humidity; if temperature is within the acceptable range but humidity is too high, the water pump power is reduced and the compressor frequency is appropriately decreased to keep temperature constant while lowering humidity; if temperature is too low but humidity is within the acceptable range, the compressor frequency is increased and the water pump power is appropriately reduced to keep humidity constant while raising temperature; if temperature is too high but humidity is within the acceptable range, the compressor frequency is reduced and the water pump power is appropriately increased to keep humidity constant while lowering temperature.

[0050] Example 2: This embodiment provides an energy-saving fresh air system with an independent compressor. The difference between this embodiment and Embodiment 1 is the specific setting of the filter section 2, and a preheating module 7 and a return air module 8 are added to the fresh air indoor unit.

[0051] Please see Figure 5-9 A preheating module 7 is integrated between the air inlet section 1 and the filter section 2. A temperature sensor is installed in the air inlet section 1. The collaborative control module collects the temperature in the air inlet section 1. When the air inlet temperature is lower than the preset compensation temperature, it controls the preheating module 7 to start heating and controls the compressor power to increase slowly. A return air module 8 is installed on the side wall of the fresh air unit. A portion of the fresh air after passing through the heat exchange section 3 and the humidification section 4 is guided back to the filter section 2. After the compressor power reaches the standard, the co-control module controls the preheating module 7 to shut down. At this time, the return air module 8 is used to keep the filter section 2 warm, and at the same time, it can prevent the water vapor in the humidification section 4 from condensing due to the low temperature of the fresh air.

[0052] This energy-saving fresh air system with an independent compressor achieves several advantages. First, by installing a preheating module 7 between the air inlet section 1 and the filter section 2, and a return air module 8 on the indoor unit, the system effectively reduces the compressor load and improves operational stability. The preheated fresh air temperature is increased, preventing the large temperature difference load that would occur if the low-temperature airflow directly entered the heat exchange section 3 and exchanged heat with the refrigerant. Second, it enhances the filtration effect. The increased temperature increases the activity of water vapor molecules in the air, making them less likely to condense on the filter surface and form water mist. This prevents water mist from adhering to dust and clogging the filter, ensuring stable air permeability. At higher temperatures, the increased molecular thermal motion of particulate matter makes it easier for them to collide and adhere to the filter fibers. Heating also reduces the viscosity of particulate matter, decreasing its probability of penetrating the filter. Finally, it prevents water vapor condensation in the humidification section 4, ensuring stable humidity. The preheated fresh air temperature is within a suitable range, preventing water vapor from condensing instantly into water droplets due to excessive temperature differences when it comes into contact with water mist in the humidification section.

[0053] In an optional embodiment, the return air module 8 includes a return air duct 80, which includes a rear air outlet 81 located after the heat exchange section 3 and the humidification section 4, and a front air outlet 82 located in front of the filter section 2. The filter section 2 contains a front filter section 21, a middle filter section 22, and a rear filter section 23 arranged sequentially along the air inlet direction. The front filter section 21 includes a front filter plate 211 with pre-drilled holes 212. The front air outlet 82 passes through the pre-drilled holes 212 and communicates with the middle filter section 22. The filter section 22 includes multiple labyrinthine intermediate filter plates 221, and the post-filter section 23 includes a post-filter plate 231. The pore size of the post-filter plate 231 is smaller than that of the front filter plate 211. When the filter section 2 is not blocked, the fresh air, after being heated by the heat exchange section 3, passes through the rear air outlet 81, the return air channel 80, and the front air outlet 82 and is directly introduced into the labyrinthine intermediate filter section 22. When the intermediate filter section 22 and the post-filter section 23 are blocked, the fresh air can be temporarily ventilated through the return air channel 80.

[0054] This energy-saving fresh air system with an independent compressor allows the return air in the return air module 8 to directly penetrate the middle filter section 22 through the front air outlet 82 of the filter section 2. This improves the heating of the filter section 2. Secondly, the side air generated by the return air module 8 disrupts the original airflow in the filter section 2, making the filtration more uniform. Finally, the return air duct 80 under this structure can also provide temporary ventilation when the middle filter section 22 is blocked.

[0055] In an optional embodiment, the intermediate filter plate 221 is shaped as a corrugated plate, and each intermediate filter plate 221 is staggered to form a Z-shaped meandering maze channel. At the same time, evenly distributed guide holes 222 are opened at the crests and troughs of the corrugated plate 221.

[0056] It should be noted that the guide hole 222 uses the air pressure difference to guide the side air introduced by the return air module 8 to penetrate the middle filter plate 221, so as to realize the cross-channel penetration and uniform diffusion of airflow, while balancing the air pressure in each area and avoiding local airflow congestion; the return air side air can quickly penetrate to all parts of the channel through the guide hole 222, forming an efficient disturbance and mixing with the main air intake airflow.

[0057] This energy-saving fresh air system with an independent compressor, by setting the middle filter plate 221 as a corrugated plate and setting guide holes 222 on the middle filter plate 221, firstly eliminates airflow dead zones, improves filtration efficiency and uniformity. The Z-shaped channels formed by the interlacing corrugated plates can guide the airflow to flow smoothly and meanderingly. Combined with the cross-channel penetration effect of the middle filter section 22, it forms multi-directional disturbance with the main airflow, reduces vortex dead zones, and increases the contact area between particles and filter plate fibers, resulting in more uniform filtration. It can also avoid local dust accumulation and slow down the clogging speed. Secondly, it reduces the draft. Wind resistance is reduced to ensure emergency ventilation. The corrugated structure, combined with the diversion effect of the guide holes 222, increases the fresh air throughput. At the same time, it enhances the return air heating effect and drainage to prevent condensation. The corrugated structure of the filter plate increases the contact area with the preheated return airflow, and the meandering channel prolongs the airflow residence time, improving heat exchange efficiency and making the overall temperature of the filtration section more uniform. Finally, the trough of the middle filter plate 221 can naturally form a water guide groove. If a small amount of water vapor condenses, it can be discharged along the water guide groove, avoiding water droplets from accumulating and soaking the filter screen, further ensuring the performance of the filter screen and the stability of humidity regulation.

[0058] In an optional embodiment, the return air duct 80 is installed and fixed on the side wall of the fresh air indoor unit, and the rear air outlet 81 includes a guide plate. The guide plate intercepts a portion of the airflow after passing through the heat exchange section 3 and guides it into the return air duct 80. The guide plate is installed and fixed on the side wall of the fresh air indoor unit, and the side wall of the fresh air indoor unit is provided with a through hole in front of the guide plate for connecting the return air duct 80 and the rear air outlet 81. The front air vent 82 includes an air guide pipe, the two ends of which are sealed and connected to the return air channel 80 and the middle filter section 22, respectively.

[0059] In an optional embodiment, the deflector is an angle-adjustable arc-shaped structure. The deflector is equipped with a stepper motor, which is signal-connected to the collaborative control module. The collaborative control module adjusts the angle of the deflector according to the deviation between the inlet air temperature and the outlet air temperature to control the return air ratio to be 10% to 30%.

[0060] In an optional embodiment, the pre-filter 21, middle filter 22 and post-filter 23 of the filter section 2 all adopt a drawer-type detachable structure. A magnetic access door is provided on the housing of the fresh air unit corresponding to the position of the filter section 2. A sealing strip is provided on the inside of the access door. A differential pressure sensor is provided in the filter section 2 to detect the air pressure difference between the pre-filter 21 and the post-filter 23. The differential pressure sensor is connected to the collaborative control module.

[0061] Furthermore, the intermediate filter plate 221 is made of electrostatic electret meltblown nonwoven fabric, the diameter of the guide holes 222 is 0.8-1.2mm, the center distance between adjacent holes is 2.5-3.5mm, the pleat depth of the intermediate filter plate 221 is 12-18mm, and the pleat spacing is 8-12mm.

[0062] In an optional embodiment, the preheating module 7 is an electric heating wire heating tube, and the preheating module 7 is located between the air inlet section 1 and the filter section 2, closer to the air inlet section 1.

[0063] Example 3: This embodiment provides an energy-saving fresh air system with an independent compressor, specifically involving the hardware settings and control logic of the collaborative control module in Embodiments 1 and 2.

[0064] In one optional embodiment, the core of the collaborative control module consists of a main control chip, a signal acquisition module, a drive module, a communication module, and a power supply module.

[0065] Specifically, the main control chip uses an STM32F4 series microcontroller, which has the ability to acquire signals through multiple channels, perform high-speed calculations, and control multiple devices in a coordinated manner. It is installed on a circuit board inside Electrical Warehouse 6.

[0066] Specifically, the signal acquisition module includes an analog acquisition unit that adapts to the 4-20mA signals of temperature / humidity / differential pressure sensors, a digital acquisition unit that adapts to the switching signals of high and low water level sensors and temperature fuses, and an acquisition cycle of 500ms to ensure real-time data.

[0067] Specifically, the drive module is configured with a variable frequency drive unit that outputs a 0-10V voltage signal to control the frequency of the independent variable frequency compressor, with an adjustment range of 30-120Hz; a water pump drive unit that outputs a PWM signal to control the power of the water supply pump / sprinkler pump / drainage pump, with a duty cycle adjustment range of 20%-100%; and a preheating module drive unit that uses a relay to control the start and stop of the heating element.

[0068] Specifically, the communication module has a reserved RS485 communication interface, which can communicate with indoor temperature control panels and smart home systems, and supports remote modification of preset temperature and humidity parameters.

[0069] Specifically, the power module has an input voltage of AC220V and an output of DC12V / 5V, which powers the control module, sensors, and drive units, and is equipped with surge and overvoltage protection circuits.

[0070] Furthermore, the core control logic of the collaborative control module includes precise temperature and humidity control logic, preheating and return air linkage control logic, and fault emergency handling logic.

[0071] Specifically, the preset parameters of the temperature and humidity linkage control logic are as follows: the default preset temperature is adjustable from 22 to 26℃, and the preset humidity is adjustable from 40% to 60%RH; the adjustment step size is: the compressor frequency is adjusted by 5Hz each time, the water pump power is adjusted by 10% of the duty cycle each time, and the adjustment interval is 3s to avoid frequent adjustments.

[0072] Specifically, the specific scenario adjustment logic for temperature and humidity linkage control is as follows: For excessively low temperatures and humidity (T < 22℃, RH < 40%RH): Increase the compressor frequency by +5Hz each time, and maintain the water pump power at 50% of the basic humidification capacity until the temperature and humidity reach the target. For excessively low temperatures and humidity (T < 22℃, RH > 60%RH): Decrease the water pump power by -10% each time, and gradually increase the compressor frequency by +5Hz each time, prioritizing reducing the humidity to 55%RH before focusing on temperature adjustment. For excessively high temperatures and humidity (T > 26℃, RH < 40%RH): Increase the water pump power by +10% each time, and maintain the compressor frequency at a minimum of 30Hz, utilizing the heat absorption from water evaporation to cool down the temperature while simultaneously increasing humidity. For excessively high temperatures and humidity (T > 26℃, RH > 60%RH): Decrease the compressor frequency by -5Hz each time, and reduce the water pump power to 30% of the minimum humidification capacity until the temperature and humidity reach the target. Temperature meets standard; Temperature meets standard, but humidity is too low (T=22-26℃, RH<40%RH): Increase the power of the water spray pump by +10% each time, and slightly increase the compressor frequency by +3Hz each time to supplement evaporative heat and ensure temperature stability; Temperature meets standard, but humidity is too high (T=22-26℃, RH>60%RH): Decrease the power of the water spray pump by -10% each time, and slightly decrease the compressor frequency by -3Hz each time to reduce evaporative heat and ensure temperature stability; Temperature is too low, but humidity meets standard (T<22℃, RH=40-60%RH): Increase the compressor frequency by +5Hz each time, and slightly decrease the power of the water spray pump by -5% each time to avoid excessive humidity due to temperature rise; Temperature is too high, but humidity meets standard (T>26℃, RH=40-60%RH): Decrease the compressor frequency by -5Hz each time, and slightly increase the power of the water spray pump by +5% each time to use evaporative heat absorption to assist in cooling and avoid excessively low humidity.

[0073] Specifically, the preheating module start threshold for the preheating and return air linkage control logic is: inlet air temperature < 5℃. The compensation temperature can be adjusted via the temperature control panel, with an adjustment range of 0-10℃.

[0074] Specifically, the startup process of the preheating and return air linkage control logic is as follows: when the inlet air temperature sensor detects that Tinlet < 5℃, the collaborative control module starts the heating element of the preheating module and simultaneously controls the compressor frequency to start from 30Hz, increasing by 5Hz every 30s until it reaches the standard power of 80Hz.

[0075] Specifically, the preheating module is shut down under the following conditions in the preheating and return air linkage control logic: the compressor frequency is stable at 80Hz for 1 minute and the supply air temperature is ≥18℃. The preheating module is shut down, and at the same time, the return air module is started and the guide vane angle is adjusted to 20° with a return air ratio of 20%.

[0076] Specifically, the return air module adjustment logic of the preheating and return air linkage control logic is as follows: when the inlet air temperature is <0℃, the guide vane angle is adjusted to 30% and the return air ratio is 30%; when the inlet air temperature is 5-10℃, the guide vane angle is adjusted to 10° and the return air ratio is 10%; when the supply air temperature is <15℃, the preheating module is restarted and the return air module continues to run.

[0077] Specifically, the emergency control logic for water level faults is as follows: When the low water level sensor triggers a water tank level <25%, the water replenishment pump is started to replenish water, while the power of the sprinkler pump is reduced to 20%. If the water level is not reached after 3 minutes of continuous replenishment, a water shortage alarm is issued. When the high water level sensor triggers a water tank level >85%, the drain pump is started to drain water. If the water level is not reached after 2 minutes of drainage, an overflow alarm is issued.

[0078] Specifically, the emergency control logic for filter blockage faults is as follows: when the differential pressure sensor detects a pressure difference between the pre-filter and the post-filter > 500Pa, a filter blockage alarm is issued, and the angle of the deflector is adjusted to 45° with a maximum return air ratio of 30%, and a temporary ventilation mode is activated.

[0079] Specifically, the temperature fault in the emergency control logic is as follows: if the preheating module temperature is >80℃, the temperature fuse will trip, the preheating module will stop running, and the compressor frequency will drop to 30Hz; if the electrical compartment temperature is >45℃, the cooling fan will start; if the temperature is >55℃, the compressor frequency will drop to 50Hz, and an overheat alarm will be issued. Specifically, the sensor failure in the emergency control logic is as follows: if any sensor has no signal output, the backup control mode is activated, and the compressor operates at a frequency of 80Hz and the water pump power is reduced to 50% according to preset fixed parameters, while a sensor failure alarm is issued.

[0080] Further settings for the overall operation process include: S1. Power-on initialization 0-5s: The collaborative control module performs a self-test, collects initial data from each sensor, and after confirming that there are no faults, starts the centrifugal fan at 50% speed; S2, Operating condition judgment 5-10s: Determine whether to start the preheating module based on the inlet air temperature, and determine the initial adjustment direction based on the supply air temperature and humidity; S3. After dynamic adjustment for 10 seconds: Data is collected at 500ms intervals. Based on parameters such as temperature and humidity deviation, pressure difference, and water level, the corresponding control logic is executed to adjust the compressor, water pump, preheating module, and return air module in a coordinated manner. S4. Stable operation: Temperature and humidity deviation ≤ ±0.5℃ / ±3%RH, and after each parameter stabilizes for 3 minutes, it enters low power consumption stable mode and extends the adjustment interval to 1 second; S5. Shutdown procedure: After receiving the shutdown command, first turn off the compressor and preheating module, keep the centrifugal fan and drain pump running for 30 seconds to drain the remaining water in the water tank and blow away the residual moisture in the machine, and then completely shut down the machine.

[0081] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving fresh air system with an independent compressor, characterized in that, It includes a fresh air indoor unit, an independent variable frequency compressor unit and a collaborative control module. The fresh air indoor unit is arranged in sequence along the fresh air flow direction as an air inlet section (1), a filter section (2), a heat exchange section (3), a humidification section (4) and an air supply section (5), wherein the heat exchange section (3) and the humidification section (4) are structurally integrated together. The independent variable frequency compressor unit is a dedicated configuration for the fresh air indoor unit and forms a heat exchange relationship with the heat exchange section (3) of the fresh air indoor unit. The independent variable frequency compressor unit and the fresh air indoor unit form an independent closed-loop operation circuit. The independent closed-loop operation circuit does not form any connection relationship with the main compressor, indoor unit and outdoor unit of the multi-split air conditioning system, so as to achieve complete decoupling between the fresh air system and the multi-split air conditioning system.

2. The energy-saving fresh air system with an independent compressor according to claim 1, characterized in that, The air supply section (5) is equipped with a temperature detection unit and a humidity detection unit. The collaborative control module is connected to the temperature detection unit, the humidity detection unit, the independent variable frequency compressor unit and the humidification component of the humidification section (4) respectively. The collaborative control module is used to collect the actual temperature and humidity of the air supply section (5), compare them with the preset temperature and humidity, and adjust the output frequency of the independent variable frequency compressor unit and the water supply speed of the humidification component to achieve accurate matching of the preset temperature and humidity of the air supply section (5).

3. The energy-saving fresh air system with an independent compressor according to claim 2, characterized in that, A preheating module (7) is integrated between the air inlet section (1) and the filter section (2). A temperature sensor is installed in the air inlet section (1). The collaborative control module collects the temperature in the air inlet section (1). When the air inlet temperature is lower than the preset compensation temperature, the preheating module (7) is controlled to start heating and the compressor power is controlled to increase slowly. A return air module (8) is installed on the side wall of the fresh air unit to guide a portion of the fresh air after passing through the heat exchange section (3) and the humidification section (4) back to the filter section (2). Thus, after the compressor power reaches the standard, the coordinating control module controls the preheating module (7) to shut down. At this time, the return air module (8) is used to keep the filter section (2) warm, and at the same time, it can prevent the water vapor in the humidification section (4) from condensing due to the low temperature of the fresh air.

4. The energy-saving fresh air system with an independent compressor according to claim 3, characterized in that, The return air module (8) includes a return air duct (80), which includes a rear air outlet (81) located after the heat exchange section (3) and the humidification section (4) and a front air outlet (82) located in front of the filter section (2). The filter section (2) is provided with a front filter (21), a middle filter (22) and a rear filter (23) in sequence along the air inlet direction. The front filter (21) includes a front filter plate (211) with a reserved hole (212). The front air outlet (82) passes through the reserved hole (212) and communicates with the middle filter (22). The middle filter (22) includes a labyrinthine set of middle filter plates (221). The rear filter (23) includes a rear filter plate (231). The pore size of the rear filter plate (231) is smaller than that of the front filter plate (211). When the filter section (2) is not blocked, the fresh air is heated by the heat exchange section (3) and then passes through the rear air inlet (81), the return air channel (80) and the front air inlet (82) and directly enters the labyrinthine middle filter section (22). When the middle filter section (22) and the rear filter section (23) are blocked, the fresh air can temporarily ventilate through the return air channel (80).

5. An energy-saving fresh air system with an independent compressor according to claim 4, characterized in that, The shape of the intermediate filter plate (221) is set as a wavy pleated plate. Each intermediate filter plate (221) is staggered to form a Z-shaped meandering maze channel. At the same time, evenly distributed guide holes (222) are opened at the wavy peaks and troughs of the intermediate filter plate (221).

6. An energy-saving fresh air system with an independent compressor according to claim 3, characterized in that, The preheating module (7) is an electric heating wire heating tube, and the preheating module (7) is located between the air inlet section (1) and the filter section (2), closer to the air inlet section (1).

7. An energy-saving fresh air system with an independent compressor according to claim 4, characterized in that, The return air duct (80) is installed and fixed on the side wall of the fresh air indoor unit. The rear air outlet (81) includes a guide plate. The guide plate intercepts a portion of the airflow after passing through the heat exchange section (3) and guides it into the return air duct (80). The guide plate is installed and fixed on the side wall of the fresh air indoor unit. The side wall of the fresh air indoor unit has a through hole in front of the guide plate for connecting the return air duct (80) and the rear air outlet (81). The front air inlet (82) includes an air guide pipe, the two ends of which are sealed and connected to the return air channel (80) and the middle filter section (22) respectively.

8. An energy-saving fresh air system with an independent compressor according to claim 4, characterized in that, The air deflector is an angle-adjustable arc-shaped structure. The air deflector is equipped with a stepper motor, which is connected to the collaborative control module. The collaborative control module adjusts the angle of the air deflector according to the deviation between the inlet air temperature and the outlet air temperature to control the return air ratio to be 10% to 30%.

9. An energy-saving fresh air system with an independent compressor according to claim 4, characterized in that, The pre-filter (21), middle filter (22) and post-filter (23) of the filter section (2) all adopt a drawer-type detachable structure. The fresh air indoor unit housing is provided with a magnetic maintenance door corresponding to the position of the filter section (2). A sealing strip is provided on the inside of the maintenance door. A differential pressure sensor is provided in the filter section (2) to detect the air pressure difference between the pre-filter (21) and the post-filter (23). The differential pressure sensor is connected to the collaborative control module.

10. An energy-saving fresh air system with an independent compressor according to any one of claims 1-9, characterized in that, The core of the collaborative control module consists of a main control chip, a signal acquisition module, a drive module, a communication module, and a power supply module.

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