Air conditioning fresh air system and control method

Abstract

The application relates to the air conditioning technical field, and provides an air conditioner fresh air system and a control method.The air conditioner fresh air system comprises a compressor, an evaporator, a throttler, a condenser, a fresh air assembly and a controller; the fresh air assembly comprises an auxiliary heat exchanger, a first valve, a second valve, a third valve and a fresh air fan and the like, and the fresh air fan is arranged towards the auxiliary heat exchanger; and the controller is used for controlling the opening and closing of the first valve, the second valve and the third valve and the rotating speed of the fresh air fan. The application adjusts the temperature of fresh air by using the auxiliary heat exchanger and the fresh air fan, so that the influence of fresh air on the overall temperature of the indoor can be effectively reduced, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning fresh air system and control method. Background Technology

[0002] In related technologies, when a ducted air conditioning system delivers fresh air into the room during operation, the outdoor fresh air temperature can easily cause fluctuations in the indoor temperature, affecting the stability of the indoor temperature and resulting in a poor user experience. Summary of the Invention

[0003] This invention provides an air conditioning fresh air system and control method to solve the defect in existing ducted air conditioning fresh air systems where outdoor fresh air temperature affects indoor temperature, resulting in poor environmental comfort. It can effectively reduce the impact of fresh air on the overall indoor temperature and improve the user experience.

[0004] This invention provides an air conditioning fresh air system, comprising:

[0005] The compressor, evaporator, expansion valve, and condenser are connected via the main refrigerant circulation loop;

[0006] The fresh air assembly includes: a refrigerant auxiliary circuit and a fresh air fan. The two ends of the refrigerant auxiliary circuit are connected to the main refrigerant circuit between the evaporator and the expansion joint. The refrigerant auxiliary circuit is provided with an auxiliary heat exchanger, a first valve, and a second valve. The first valve and the second valve are located at both ends of the auxiliary heat exchanger, and a third valve is provided between the two ends of the refrigerant auxiliary circuit. The third valve is located in the main refrigerant circuit between the evaporator and the expansion joint. The fresh air fan is positioned facing the auxiliary heat exchanger.

[0007] The controller is used to control the opening and closing of the first valve, the second valve and the third valve, as well as the speed of the fresh air fan.

[0008] An air conditioning fresh air system according to the present invention further includes:

[0009] The first temperature sensor, located indoors and connected to the controller, is used to detect the indoor ambient temperature;

[0010] The second temperature sensor, located outdoors and connected to the controller, is used to detect the outdoor ambient temperature.

[0011] The controller is used to control the opening and closing of the first valve, the second valve, and the third valve, as well as the speed of the fresh air fan, based on the temperature difference between the indoor ambient temperature and the outdoor ambient temperature, and the temperature difference between the outdoor ambient temperature and the set temperature.

[0012] An air conditioning fresh air system according to the present invention further includes:

[0013] A third temperature sensor and an indoor fan are located on both sides of the evaporator and connected to the controller. The third temperature sensor is used to detect the supply air temperature after heat exchange.

[0014] A fourth temperature sensor is located on the side of the auxiliary heat exchanger facing away from the fresh air fan and is connected to the controller to detect the temperature of the fresh air after the auxiliary heat exchange.

[0015] The controller is also used to control the speed of the fresh air fan and the indoor fan based on the temperature difference between the fresh air temperature and the supply air temperature.

[0016] According to an air conditioning fresh air system provided by the present invention, the compressor is connected to the evaporator and the condenser respectively via a four-way valve, and the four-way valve is connected to the controller.

[0017] According to an air conditioning fresh air system provided by the present invention, a filter is provided between the throttling device and the condenser.

[0018] According to an air conditioning fresh air system provided by the present invention, the fresh air component is installed in the outdoor unit, and the auxiliary heat exchanger is connected to the indoor unit via a fresh air duct.

[0019] The present invention also provides a control method for the above-mentioned air conditioning fresh air system, comprising:

[0020] When the air conditioning fresh air system is running, the temperature difference between the indoor ambient temperature and the outdoor ambient temperature is obtained;

[0021] When the temperature difference between indoor and outdoor ambient temperatures is greater than or equal to the first preset value, the target operating mode is determined;

[0022] In the target operating mode, the opening and closing of the first valve, the second valve, and the third valve, as well as the speed of the fresh air fan, are controlled according to the temperature difference between the outdoor ambient temperature and the set temperature.

[0023] According to a control method for an air conditioning fresh air system provided by the present invention, in the target operating mode, the steps of controlling the opening and closing of the first valve, the second valve, and the third valve, as well as the rotational speed of the fresh air fan, based on the temperature difference between the outdoor ambient temperature and the set temperature, include:

[0024] The target operating mode is determined to be either heating or cooling mode:

[0025] If the temperature difference between the outdoor ambient temperature and the set temperature is greater than or equal to the second preset value, the first valve and the second valve are opened, the third valve is closed, and the fresh air fan runs at a preset speed.

[0026] If the temperature difference between the outdoor ambient temperature and the set temperature is less than the second preset value, the first valve and the second valve are closed, the third valve is opened, and the fresh air fan runs at low speed.

[0027] According to a control method for an air conditioning fresh air system provided by the present invention, after the steps of controlling the first valve and the second valve to open, the third valve to close, and the fresh air fan to operate at a preset speed, the method further includes:

[0028] Obtain the fresh air temperature after auxiliary heat exchange via the auxiliary heat exchanger and the supply air temperature after heat exchange via the evaporator;

[0029] The speed of the fresh air fan and the indoor fan is controlled based on the temperature difference between the fresh air temperature and the supply air temperature.

[0030] According to a control method for an air conditioning fresh air system provided by the present invention, the step of controlling the rotational speed of the fresh air fan and the indoor fan based on the temperature difference between the fresh air temperature and the supply air temperature includes:

[0031] If the temperature difference between the fresh air temperature and the supply air temperature is less than a third preset value, the speed of the fresh air fan and the indoor fan will be adjusted synchronously.

[0032] If the temperature difference between the fresh air temperature and the supply air temperature is greater than or equal to a third preset value, the speed of the fresh air fan is reduced.

[0033] The air conditioning fresh air system and control method provided by this invention, when it is necessary to adjust the fresh air temperature, controls the flow direction of the system refrigerant by opening or closing the first valve, the second valve and the third valve, so that the refrigerant enters the auxiliary heat exchanger. The refrigerant in the auxiliary heat exchanger is used to heat or cool the fresh air, so that the fresh air temperature is as close as possible to the indoor temperature, and then the fresh air is sent into the room by the fresh air fan. This can effectively reduce the impact of fresh air on the overall indoor temperature. Moreover, by making reasonable use of the system's own refrigerant energy, there is no need to use a traditional electric heater, achieving the dual goals of high efficiency and energy saving and comfort, thereby improving the user experience. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the air conditioning fresh air system provided by the present invention;

[0036] Figure 2This is one of the flowcharts illustrating the control method for the air conditioning fresh air system provided by the present invention;

[0037] Figure 3 This is the second flowchart illustrating the control method for the air conditioning fresh air system provided by the present invention.

[0038] Figure label:

[0039] 1: Evaporator; 2: Compressor; 3: Expansion valve; 4: Condenser; 5: Refrigerant main circuit;

[0040] 6: Refrigerant auxiliary circuit; 7: Fresh air fan; 8: Auxiliary heat exchanger; 9: First valve;

[0041] 10: Second valve; 11: Third valve; 12: First temperature sensor;

[0042] 13: Second temperature sensor; 14: Third temperature sensor; 15: Indoor fan;

[0043] 16: Fourth temperature sensor; 17: Four-way valve; 18: Filter; 19: Fresh air duct;

[0044] 20: Outdoor fan; 21: Indoor computer board; 22: Outdoor computer board. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0046] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] The following is combined with Figures 1-3 The present invention describes an air conditioning fresh air system and control method.

[0050] According to an embodiment of the first aspect of the present invention, referring to Figure 1 As shown, the air conditioning fresh air system provided by the present invention mainly includes: an indoor unit, an outdoor unit, a fresh air component, and a controller.

[0051] The indoor unit includes an evaporator 1, and the outdoor unit includes a compressor 2, a throttle 3, and a condenser 4. The compressor 2, evaporator 1, throttle 3, and condenser 4 are connected in a refrigerant main circuit 5 to form a cooling or heating cycle.

[0052] The fresh air assembly includes: a refrigerant auxiliary circuit 6 and a fresh air fan 7. The two ends of the refrigerant auxiliary circuit 6 are connected to the refrigerant main circuit 5 between the evaporator 1 and the throttle valve 3. The refrigerant auxiliary circuit 6 is provided with an auxiliary heat exchanger 8, a first valve 9 and a second valve 10. The first valve 9 and the second valve 10 are located at both ends of the auxiliary heat exchanger 8, and a third valve 11 is provided between the two ends of the refrigerant auxiliary circuit 6. The third valve 11 is located in the refrigerant main circuit 5 between the evaporator 1 and the throttle valve 3. The fresh air fan 7 is arranged facing the auxiliary heat exchanger 8.

[0053] The controller is mainly used to control the opening and closing of the first valve 9, the second valve 10 and the third valve 11, as well as the speed of the fresh air fan 7.

[0054] Specifically, the fresh air assembly is the core improvement of this invention. It includes a refrigerant auxiliary line 6 connected to the refrigerant main line 5 and a fresh air fan 7. The refrigerant auxiliary line 6 is connected to the refrigerant main line 5 between the evaporator 1 and the throttle 3, so that heat exchange between the refrigerant and the fresh air can be achieved through the auxiliary heat exchanger 8.

[0055] The auxiliary heat exchanger 8 is equipped with a first valve 9 and a second valve 10 on both sides, which can be opened or closed as needed to control whether the refrigerant flows through the auxiliary heat exchanger 8, thereby determining whether to heat or cool the fresh air.

[0056] A third valve 11 is also installed on the main refrigerant circuit 5, which can further regulate the flow state of the refrigerant between the main refrigerant circuit 5 and the auxiliary refrigerant circuit 6, and finely adjust the energy exchange efficiency.

[0057] The fresh air fan 7 is responsible for introducing fresh outdoor air and directing it to the auxiliary heat exchanger 8. The fresh air, after being conditioned, is then sent into the room to ensure that its temperature is close to the indoor temperature, thereby reducing its impact on the indoor temperature.

[0058] The controller adjusts the on / off states of the first valve 9, the second valve 10, and the third valve 11, as well as the operating speed of the fresh air fan 7, to adapt to the fresh air temperature regulation requirements under different environmental conditions, thereby maintaining a constant and comfortable indoor temperature environment and improving the user experience.

[0059] The working principle of the air conditioning fresh air system provided by this invention is described below, mainly including:

[0060] When the system operates in heating mode, if the temperature difference between the outdoor ambient temperature and the user-set temperature is greater than or equal to 10℃, it indicates that the outdoor ambient temperature is significantly lower than the user-set indoor temperature. To prevent the directly introduced low-temperature fresh air from causing a sharp drop in indoor temperature, the system activates the auxiliary heating function. Specifically, the controller opens the first valve 9 and the second valve 10, allowing refrigerant to flow through the auxiliary heat exchanger 8. The high-temperature refrigerant circulating from the compressor 2 to the evaporator 1 heats the fresh air. Simultaneously, the fresh air fan 7 starts operating at a preset speed, delivering the heated fresh air into the room.

[0061] If the temperature difference between the outdoor ambient temperature and the user-set temperature is less than 10℃, it means that the outdoor ambient temperature is close to the indoor set temperature. Since the temperature of the fresh air itself is relatively suitable, no additional heating is required. Therefore, the auxiliary heat exchange function is turned off. That is, the controller controls the first valve 9 and the second valve 10 to close and the third valve 11 to open, so that the refrigerant does not pass through the auxiliary heat exchanger 8, in order to maintain the normal efficiency of the heating cycle of the main refrigerant circuit 5.

[0062] Meanwhile, the fresh air fan 7 is adjusted to a lower speed to slowly introduce fresh air into the room. This reduces the slight temperature fluctuations caused by a large influx of fresh air in a short period of time, ensuring a more constant indoor temperature, improving user comfort, and saving energy.

[0063] When the system operates in cooling mode, if the temperature difference between the outdoor ambient temperature and the user-set temperature is greater than or equal to 5℃, it indicates that the outdoor ambient temperature is much higher than the user-set indoor temperature. To prevent the introduced fresh air from directly causing an increase in indoor temperature, the system activates the auxiliary cooling function. Specifically, the controller opens the first valve 9 and the second valve 10, allowing refrigerant to flow through the auxiliary heat exchanger 8. Here, the low-temperature refrigerant flowing from the throttling device 3 absorbs heat from the fresh air, thus cooling it. Simultaneously, the fresh air fan 7 starts operating at a preset speed, delivering the cooled fresh air into the room to maintain a constant indoor temperature.

[0064] If the temperature difference between the outdoor ambient temperature and the user-set temperature is less than 5℃, it indicates that the outdoor ambient temperature is close to the indoor set temperature. Since the fresh air temperature is suitable, no additional cooling is required. At this time, the controller shuts off the auxiliary heat exchange function, that is, it controls the first valve 9 and the second valve 10 to close and the third valve 11 to open, so that the refrigerant does not pass through the auxiliary heat exchanger 8, ensuring the refrigeration cycle efficiency of the main refrigerant circuit 5.

[0065] The fresh air fan 7 is adjusted to a lower speed to introduce fresh air into the room at a slower pace. This minimizes the impact of fresh air on the indoor temperature and maintains a stable indoor microclimate.

[0066] Therefore, the air conditioning fresh air system provided in this embodiment of the invention heats or cools the fresh air by using the refrigerant in the auxiliary heat exchanger 8, so that the fresh air temperature is as close as possible to the indoor temperature. This can effectively reduce the impact of the fresh air on the overall indoor temperature. Furthermore, it makes reasonable use of the system's own refrigerant energy under different operating conditions, eliminating the need for traditional electric heaters. This achieves the dual goals of high efficiency, energy saving, and comfort, providing a good user experience regardless of whether it is in heating or cooling mode.

[0067] According to one embodiment of the present invention, referring to Figure 1 As shown, the air conditioning fresh air system of the present invention further includes: a first temperature sensor 12 and a second temperature sensor 13. The first temperature sensor 12 is installed indoors, for example, on the casing of the indoor unit, and is connected to the controller for detecting the indoor ambient temperature; the second temperature sensor 13 is installed outdoors, for example, on the casing of the outdoor unit, and is connected to the controller for detecting the outdoor ambient temperature; the controller is used to control the opening and closing of the first valve 9, the second valve 10, and the third valve 11, as well as the rotation speed of the fresh air fan 7, based on the temperature difference between the indoor and outdoor ambient temperatures and the temperature difference between the outdoor ambient temperature and the set temperature.

[0068] Specifically, when the temperature difference between indoors and outdoors is greater than or equal to the first preset value, the system will intelligently switch operating modes according to the outdoor temperature:

[0069] If the outdoor temperature is low in winter (below the set threshold), the system will automatically switch to heating mode. The system can also heat the introduced fresh air by opening the corresponding valves and adjusting the speed of the fresh air fan 7, thereby improving indoor comfort.

[0070] Conversely, if the outdoor temperature is high in summer (above the set threshold), the system will switch the target mode to cooling mode. Similarly, by controlling the valves and the speed of the fresh air fan 7, the fresh air passing through the auxiliary heat exchanger 8 can be cooled before being sent into the room.

[0071] Through this design, the embodiments of the present invention can not only effectively regulate the temperature of fresh air, but also intelligently switch and optimize the operation mode of the air conditioning system according to the temperature difference between indoors and outdoors, thus ensuring the microclimate stability of the user's living space and achieving the goal of high efficiency and energy saving.

[0072] According to one embodiment of the present invention, referring to Figure 1 As shown, the air conditioning fresh air system of the present invention further includes: a third temperature sensor 14, an indoor fan 15, and a fourth temperature sensor 16. The third temperature sensor 14 and the indoor fan 15 are located on both sides of the evaporator 1 and connected to the controller. The third temperature sensor 14 is used to detect the supply air temperature after heat exchange. The fourth temperature sensor 16 is located on the side of the auxiliary heat exchanger 8 facing away from the fresh air fan 7 and is connected to the controller, used to detect the fresh air temperature after auxiliary heat exchange. The controller is also used to control the rotation speed of the fresh air fan 7 and the indoor fan 15 based on the temperature difference between the fresh air temperature and the supply air temperature.

[0073] Specifically, the third temperature sensor 14 is located on the air supply side of the evaporator 1 to monitor the indoor air temperature after heat exchange treatment by the evaporator 1. This helps the system understand the current air treatment effect and whether it meets the requirements of the indoor environment settings.

[0074] The fourth temperature sensor 16 is located on the side of the auxiliary heat exchanger 8 facing away from the fresh air fan 7, i.e., the position of the fresh air after it has been regulated by the auxiliary heat exchanger 8. It is used to detect the actual temperature change of the fresh air after it has been heated or cooled. This ensures that the fresh air has been properly adjusted to a near-ideal temperature close to the room temperature before entering the room.

[0075] The controller makes a judgment based on the temperature difference between the fresh air temperature detected by the fourth temperature sensor 16 and the supply air temperature detected by the third temperature sensor 14:

[0076] If the temperature difference is less than the third preset value, it indicates that the temperature of the fresh air and the supply air are similar. In order to maintain uniform indoor air mixing and reasonable temperature distribution, when the speed of the indoor fan 15 changes, the speed of the fresh air fan 7 is adjusted synchronously to make it the same as the speed of the indoor fan 15, so as to maintain good air circulation and temperature balance.

[0077] If the temperature difference is greater than or equal to the third preset value, it means that the fresh air temperature needs to be further adjusted to approach the supply air temperature. At this time, the controller reduces the speed of the fresh air fan 7, slowing down the speed and volume of the fresh air entering the room. On the one hand, this avoids excessively cold or hot fresh air from directly causing excessive fluctuations in the indoor temperature; on the other hand, with the help of the auxiliary heat exchanger 8, the fresh air temperature is more fully adjusted before being introduced into the room, improving the overall comfort and energy-saving effect of the system.

[0078] This invention achieves a high degree of intelligence in the fresh air treatment process by real-time monitoring and precise control of the relationship between fresh air and supply air temperatures. It effectively solves the problem of indoor temperature fluctuations caused by unstable fresh air temperatures, and improves the overall performance of the air conditioning system and user comfort.

[0079] According to one embodiment of the present invention, referring to Figure 1 As shown, compressor 2 is connected to evaporator 1 and condenser 4 via four-way valve 17, and four-way valve 17 is connected to controller for switching the system's cooling and heating modes.

[0080] Specifically, the first valve port of the four-way valve 17 is connected to the discharge port of the compressor 2, the second valve port of the four-way valve 17 is connected to the evaporator 1, the third valve port of the four-way valve 17 is connected to the condenser 4, and the fourth valve port of the four-way valve 17 is connected to the suction port of the compressor 2.

[0081] In heating mode, if the first valve 9 and the second valve 10 are closed and the third valve 11 is open, the high-temperature refrigerant generated by the compressor 2 flows into the evaporator 1 through the four-way valve 17 for condensation and heat release. Then, it is throttled and cooled by the expansion valve 3, flows into the condenser 4 for evaporation and heat absorption, and then flows back to the compressor 2 through the four-way valve 17. If the first valve 9 and the second valve 10 are open and the third valve 11 is closed, the high-temperature refrigerant generated by the compressor 2 flows into the evaporator 1 through the four-way valve 17 for condensation and heat release. Then, it flows into the auxiliary heat exchanger 8 to continue releasing heat and heating the fresh air. Then, it is throttled and cooled by the expansion valve 3, flows into the condenser 4 for evaporation and heat absorption, and then flows back to the compressor 2 through the four-way valve 17.

[0082] In cooling mode, if the first valve 9 and the second valve 10 are closed and the third valve 11 is open, the high-temperature refrigerant generated by the compressor 2 flows into the condenser 4 through the four-way valve 17 for condensation and heat release. Then, it is throttled and cooled by the expansion valve 3, flows into the evaporator 1 for evaporation and heat absorption, and then flows back to the compressor 2 through the four-way valve 17. If the first valve 9 and the second valve 10 are open and the third valve 11 is closed, the high-temperature refrigerant generated by the compressor 2 flows into the condenser 4 through the four-way valve 17 for condensation and heat release. Then, it is cooled by the expansion valve 3, flows into the auxiliary heat exchanger 8 to cool the fresh air, then flows into the evaporator 1 for evaporation and heat absorption, and then flows back to the compressor 2 through the four-way valve 17.

[0083] According to one embodiment of the present invention, referring to Figure 1 As shown, a filter 18 is provided between the throttle 3 and the condenser 4.

[0084] This design can filter out impurities, moisture or other harmful substances that may be carried during the refrigerant circulation process, preventing these impurities from entering components such as the expansion valve 3, evaporator 1 or condenser 4, avoiding affecting the flow characteristics of the refrigerant and the heat exchange effect, and ensuring stable cooling and heating performance.

[0085] The specific types of the first valve 9, the second valve 10, and the third valve 11 in this invention are not particularly limited, as long as they can function to open or close the flow path, such as solenoid valves.

[0086] Furthermore, the throttle 3 of the present invention can be selected as an electronic expansion valve or a capillary tube according to actual needs. When it is an electronic expansion valve, the electronic expansion valve is connected to the controller.

[0087] It is understandable that when an electronic expansion valve is selected as the throttle valve 3, since it is directly connected to the controller and receives intelligent control commands, it can better match the energy-saving, comfort and intelligent requirements of the air conditioning fresh air system of the present invention, ensuring that the temperature of fresh air and indoor air can be effectively adjusted under any working conditions, and maintaining the efficient operation of the entire air conditioning system.

[0088] According to one embodiment of the present invention, the fresh air assembly is disposed in the outdoor unit, and the auxiliary heat exchanger 8 is connected to the indoor unit via the fresh air duct 19.

[0089] This invention moves the fresh air treatment component to the outdoor unit, which can significantly reduce the size of the indoor unit and the required installation space. This is especially beneficial for users with limited living space or who wish to maintain a simple interior design, as it minimizes the impact on the interior layout.

[0090] Furthermore, outdoor units are usually located outside the building or in well-ventilated areas. Placing noise sources such as fresh air fans outdoors helps reduce indoor environmental noise and improve indoor comfort.

[0091] In addition, since the fresh air is introduced from the outside and pre-treated (heated or cooled) by the auxiliary heat exchanger 8 before being sent into the room, the temperature of the introduced fresh air is kept at a suitable level, reducing disturbance to the indoor temperature and humidity environment.

[0092] According to one embodiment of the present invention, a filter device, such as a filter screen, is installed in the fresh air duct 19, which can effectively intercept and adsorb pollutants such as dust, pollen, and fine particulate matter in the air, ensuring that the fresh air delivered into the room is cleaner and improving the indoor air quality.

[0093] According to one embodiment of the present invention, referring to Figure 1As shown, the outdoor unit also includes an outdoor fan 20, which is arranged side by side with the condenser 4 and connected to the controller. The outdoor fan 20 can be an axial flow fan to improve the heat exchange effect.

[0094] According to one embodiment of the present invention, referring to Figure 1 As shown, the controller includes an indoor computer board 21 and an outdoor computer board 22. The indoor computer board 21 is located inside the indoor unit and is connected to components such as the outdoor computer board 22, the first temperature sensor 12, the third temperature sensor 14, and the indoor fan 15. The outdoor computer board 22 is located inside the outdoor unit and is connected to components such as the second temperature sensor 13, the fourth temperature sensor 16, the fresh air fan 7, the outdoor fan 20, the first valve 9, the second valve 10, the third valve 11, the four-way valve 17, and the compressor 2.

[0095] The controller in this embodiment of the invention adopts a dual control module design with an indoor computer board 21 and an outdoor computer board 22. The indoor computer board 21 is installed inside the indoor unit and, as part of the entire control system, is mainly responsible for collecting and processing parameter information related to the indoor environment. The outdoor computer board 22 is located inside the outdoor unit and undertakes the task of intelligently controlling the outdoor equipment and some key components.

[0096] Furthermore, the indoor computer board 21 and the outdoor computer board 22 exchange information and work collaboratively through communication. For example, they can transmit data and commands to each other via wired or wireless means, sharing temperature data, fan status information, and valve opening and closing status collected by various sensors, so as to facilitate the overall control of the air conditioning system's working mode, operating parameters, and efficiency optimization.

[0097] The control method of the air conditioning fresh air system provided by the present invention is described below. The control method of the air conditioning fresh air system described below can be referred to in correspondence with the air conditioning fresh air system described above.

[0098] According to an embodiment of the second aspect of the present invention, referring to Figure 2 As shown, the present invention also provides a control method for the air conditioning fresh air system of the above embodiments, which mainly includes the following steps:

[0099] S201. When the air conditioning fresh air system is running, obtain the temperature difference between the indoor ambient temperature and the outdoor ambient temperature.

[0100] The difference between the indoor ambient temperature (indoor ambient temperature) and the outdoor ambient temperature (outdoor ambient temperature) is monitored and calculated in real time by a first temperature sensor 12 and a second temperature sensor 13 installed on the indoor unit and the outdoor unit, respectively.

[0101] S202. When the temperature difference between indoor and outdoor ambient temperatures is greater than or equal to the first preset value, determine the target operating mode.

[0102] When the temperature difference between the indoor and outdoor ambient temperatures is greater than or equal to a first preset value, the controller will determine the appropriate operating mode (cooling or heating) based on the outdoor temperature. For example, if the outdoor temperature is low in winter (below the set threshold), the system will operate in heating mode; conversely, if the outdoor temperature is high in summer (above the set threshold), the system will operate in cooling mode.

[0103] S203. In the target operating mode, based on the temperature difference between the outdoor ambient temperature and the set temperature, control the opening and closing of the first valve 9, the second valve 10 and the third valve 11, as well as the speed of the fresh air fan 7.

[0104] After determining the target operating mode, the opening and closing of each valve, as well as the speed of the fresh air fan 7, are precisely controlled based on the temperature difference between the outdoor ambient temperature and the user-set indoor temperature target value.

[0105] For example, in heating mode, when the outdoor temperature is low, the auxiliary heat exchanger 8 is activated to heat the fresh air, and the speed of the fresh air fan 7 is appropriately increased to ensure that the temperature of the fresh air delivered into the room is suitable. In cooling mode, when the outdoor temperature is high, the auxiliary heat exchanger 8 will be used to cool the fresh air according to actual needs, and the speed of the fresh air fan 7 will be adjusted accordingly to ensure that the entry of fresh air will not cause large fluctuations in indoor temperature.

[0106] The control method provided in this invention aims to intelligently sense changes in ambient temperature and flexibly adjust the operating parameters of the air conditioning fresh air system accordingly, so that the system can maintain a constant indoor temperature more efficiently and accurately, while optimizing energy efficiency and improving user comfort.

[0107] According to an embodiment of the present invention, in a target operating mode, the steps of controlling the opening and closing of the first valve 9, the second valve 10, and the third valve 11, as well as the rotational speed of the fresh air fan 7, based on the temperature difference between the outdoor ambient temperature and the set temperature, include:

[0108] Determine the target operating mode as heating or cooling:

[0109] If the temperature difference between the outdoor ambient temperature and the set temperature is greater than or equal to the second preset value, the first valve 9 and the second valve 10 are opened, the third valve 11 is closed, and the fresh air fan 7 runs at the preset speed.

[0110] If the temperature difference between the outdoor ambient temperature and the set temperature is less than the second preset value, the first valve 9 and the second valve 10 are closed, the third valve 11 is opened, and the fresh air fan 7 runs at low speed.

[0111] In heating mode, the second preset value can be, for example, 10°C, and in cooling mode, the second preset value can be, for example, 5°C.

[0112] Specifically, when the temperature difference between the outdoor ambient temperature and the user-set indoor temperature is greater than or equal to the second preset value:

[0113] In heating mode, if the outdoor temperature is significantly lower than the set temperature and the temperature difference exceeds 10°C, the controller opens the first valve 9 and the second valve 10 to activate the auxiliary heat exchanger 8 to heat the fresh air. Simultaneously, the third valve 11 closes, ensuring the refrigerant flows through the refrigerant auxiliary path 6. At this time, the fresh air fan 7 starts operating at a preset speed, delivering the heated fresh air into the room.

[0114] Similarly, in cooling mode, if the outdoor temperature is higher than the set temperature and the temperature difference between the two reaches more than 5°C, the same operation will be performed, but at this time the auxiliary heat exchanger 8 will be used to cool the fresh air.

[0115] When the temperature difference between the outdoor ambient temperature and the set temperature is less than the second preset value:

[0116] Regardless of whether in heating or cooling mode, the system will close the first valve 9 and the second valve 10 to cut off the operation of the auxiliary heat exchanger 8, meaning it will not receive additional heating or cooling. Simultaneously, the third valve 11 will open, allowing refrigerant to flow through the main refrigerant line 5. At this time, the fresh air fan 7 will operate at a low speed, slowly introducing fresh air into the room to avoid drastic fluctuations in indoor temperature and to save energy.

[0117] Through this intelligent control mechanism, the air conditioning fresh air system can flexibly adjust its operating status under different climatic conditions, ensuring both constant indoor temperature comfort and achieving energy-saving and efficient operation.

[0118] According to one embodiment of the present invention, after the steps of controlling the first valve 9 and the second valve 10 to open, the third valve 11 to close, and the fresh air fan 7 to operate at a preset speed, the method further includes:

[0119] Obtain the fresh air temperature after auxiliary heat exchange via auxiliary heat exchanger 8 and the supply air temperature after heat exchange via evaporator 1;

[0120] Based on the temperature difference between the fresh air temperature and the supply air temperature, the speeds of the fresh air fan 7 and the indoor fan 15 are controlled, specifically including:

[0121] If the temperature difference between the fresh air temperature and the supply air temperature is less than the third preset value, the speed of the fresh air fan 7 and the indoor fan 15 will be adjusted synchronously.

[0122] If the temperature difference between the fresh air temperature and the supply air temperature is greater than or equal to the third preset value, reduce the speed of the fresh air fan 7.

[0123] Specifically, the third temperature sensor 14 detects the indoor supply air temperature after heat exchange in the evaporator 1, and the fourth temperature sensor 16 monitors the fresh air temperature after processing by the auxiliary heat exchanger 8. When the temperature difference between the fresh air temperature and the supply air temperature is less than a third preset value, it indicates that the fresh air has been sufficiently regulated and is close to the indoor supply air temperature. To ensure uniform air mixing and maintain indoor temperature balance, the controller will synchronously adjust the speeds of the fresh air fan 7 and the indoor fan 15 to keep them in the same or similar air supply state.

[0124] If the temperature difference between the fresh air temperature and the supply air temperature is greater than or equal to the third preset value, it means that the fresh air needs more time or more suitable conditions to reach the ideal temperature. At this time, the controller selects to reduce the speed of the fresh air fan 7, which can slow down the speed at which the fresh air enters the room, giving the auxiliary heat exchanger 8 more time to effectively regulate the fresh air temperature and avoid large fluctuations in the indoor ambient temperature due to the fresh air being too cold or too hot.

[0125] This invention, through real-time monitoring and dynamic adjustment strategies, enables the air conditioning fresh air system to more accurately control indoor climate conditions and ensure that users enjoy a constant and comfortable indoor temperature.

[0126] According to one embodiment of the present invention, the control method of the air conditioning fresh air system of the present invention further includes:

[0127] When the temperature difference between the indoor and outdoor ambient temperatures is less than a first preset value, the first valve 9 and the second valve 10 are closed, the third valve 11 is opened, and the fresh air fan 7 operates at a low speed. At this time, the system achieves the function of fresh air ventilation, rather than performing additional heating or cooling treatment on the fresh air, and there is no need for cooling or heating.

[0128] Since the temperature difference between indoors and outdoors is small, it indicates that the ambient temperature is close to the indoor temperature. Therefore, it is not necessary to adjust the fresh air temperature through the auxiliary heat exchanger 8 to ensure that the fresh air supplied to the room will not have a significant impact on the indoor microclimate. At the same time, by reducing the speed of the fresh air fan 7, the speed and flow rate of the fresh air intake can be reduced, allowing the indoor air and fresh air to mix more smoothly, maintaining the stability and comfort of the indoor temperature.

[0129] The control method for the air conditioning fresh air system provided by the present invention will be further described below with reference to a specific example. Figure 3 As shown, it mainly includes:

[0130] (1) The air conditioning fresh air system is running, the temperature difference between indoor ambient temperature and outdoor ambient temperature is detected, and it is determined whether the temperature difference is less than the first preset value;

[0131] (2) If so, i.e. the temperature difference is small, then control the first valve 9 and the second valve 10 to close, the third valve 11 to open, and the fresh air fan 7 to run at low speed for normal ventilation, without the need for cooling or heating.

[0132] (3) If not, i.e. the temperature difference is large, if it is in heating mode, determine whether the temperature difference between the outdoor ambient temperature and the set temperature is greater than or equal to 10℃. If yes, control the first valve 9 and the second valve 10 to open, the third valve 11 to close, and the fresh air fan 7 to run at the preset speed to start the auxiliary heating function; if not, control the first valve 9 and the second valve 10 to close, the third valve 11 to open, and the fresh air fan 7 to run at low speed.

[0133] (4) If it is in cooling mode, determine whether the temperature difference between the outdoor ambient temperature and the set temperature is greater than or equal to 5℃. If so, control the first valve 9 and the second valve 10 to open, the third valve 11 to close, and the fresh air fan 7 to run at the preset speed to activate the auxiliary cooling function. If not, control the first valve 9 and the second valve 10 to close, the third valve 11 to open, and the fresh air fan 7 to run at low speed.

[0134] (5) In cooling or heating mode, when the first valve 9 and the second valve 10 are opened and the third valve 11 is closed, and the fresh air fan 7 runs at a preset speed for a certain period of time, the temperature difference between the fresh air temperature after heat exchange and the supply air temperature is continuously detected, and it is determined whether the temperature difference is less than the third preset value.

[0135] (6) If so, i.e. the temperature difference is small, adjust the speed of the fresh air fan 7 and the indoor fan 15 simultaneously;

[0136] (7) If not, i.e. the temperature difference is large, reduce the speed of the fresh air fan 7.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning fresh air system, characterized in that, include: The compressor, evaporator, expansion valve, and condenser are connected via the main refrigerant circulation loop; The fresh air assembly includes: a refrigerant auxiliary circuit and a fresh air fan. The two ends of the refrigerant auxiliary circuit are connected to the main refrigerant circuit between the evaporator and the expansion joint. The refrigerant auxiliary circuit is provided with an auxiliary heat exchanger, a first valve, and a second valve. The first valve and the second valve are located at both ends of the auxiliary heat exchanger, and a third valve is provided between the two ends of the refrigerant auxiliary circuit. The third valve is located in the main refrigerant circuit between the evaporator and the expansion joint. The fresh air fan is positioned facing the auxiliary heat exchanger. The controller is used to control the opening and closing of the first valve, the second valve and the third valve, as well as the speed of the fresh air fan; The first temperature sensor, located indoors and connected to the controller, is used to detect the indoor ambient temperature; The second temperature sensor, located outdoors and connected to the controller, is used to detect the outdoor ambient temperature. The controller is used to control the opening and closing of the first valve, the second valve, and the third valve, as well as the speed of the fresh air fan, based on the temperature difference between the indoor ambient temperature and the outdoor ambient temperature, and the temperature difference between the outdoor ambient temperature and the set temperature. A third temperature sensor and an indoor fan are located on both sides of the evaporator and connected to the controller. The third temperature sensor is used to detect the supply air temperature after heat exchange. A fourth temperature sensor is located on the side of the auxiliary heat exchanger facing away from the fresh air fan and is connected to the controller to detect the temperature of the fresh air after the auxiliary heat exchange. The controller is also used to control the speed of the fresh air fan and the indoor fan based on the temperature difference between the fresh air temperature and the supply air temperature.

2. The air conditioning fresh air system according to claim 1, characterized in that, The compressor is connected to the evaporator and the condenser via a four-way valve, and the four-way valve is connected to the controller.

3. The air conditioning fresh air system according to claim 1, characterized in that, A filter is provided between the throttle and the condenser.

4. The air conditioning fresh air system according to any one of claims 1-3, characterized in that, The fresh air assembly is located on the outdoor unit, and the auxiliary heat exchanger is connected to the indoor unit via a fresh air duct.

5. A control method for an air conditioning fresh air system according to any one of claims 1-4, characterized in that, include: When the air conditioning fresh air system is running, the temperature difference between the indoor ambient temperature and the outdoor ambient temperature is obtained; When the temperature difference between indoor and outdoor ambient temperatures is greater than or equal to the first preset value, the target operating mode is determined; In the target operating mode, the opening and closing of the first valve, the second valve, and the third valve, as well as the speed of the fresh air fan, are controlled according to the temperature difference between the outdoor ambient temperature and the set temperature.

6. The control method for the air conditioning fresh air system according to claim 5, characterized in that, In the target operating mode, the steps of controlling the opening and closing of the first valve, the second valve, and the third valve, as well as the speed of the fresh air fan, based on the temperature difference between the outdoor ambient temperature and the set temperature include: The target operating mode is determined to be either heating or cooling mode: If the temperature difference between the outdoor ambient temperature and the set temperature is greater than or equal to the second preset value, the first valve and the second valve are opened, the third valve is closed, and the fresh air fan runs at a preset speed. If the temperature difference between the outdoor ambient temperature and the set temperature is less than the second preset value, the first valve and the second valve are closed, the third valve is opened, and the fresh air fan runs at low speed.

7. The control method for an air conditioning fresh air system according to claim 6, characterized in that, After the steps of controlling the first valve and the second valve to open, the third valve to close, and the fresh air fan to operate at a preset speed, the method further includes: Obtain the fresh air temperature after auxiliary heat exchange via the auxiliary heat exchanger and the supply air temperature after heat exchange via the evaporator; The speed of the fresh air fan and the indoor fan is controlled based on the temperature difference between the fresh air temperature and the supply air temperature.

8. The control method for an air conditioning fresh air system according to claim 7, characterized in that, The step of controlling the speed of the fresh air fan and the indoor fan based on the temperature difference between the fresh air temperature and the supply air temperature includes: If the temperature difference between the fresh air temperature and the supply air temperature is less than a third preset value, the speed of the fresh air fan and the indoor fan will be adjusted synchronously. If the temperature difference between the fresh air temperature and the supply air temperature is greater than or equal to a third preset value, the speed of the fresh air fan is reduced.

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