Heating and ventilation air purification system, air conditioner and control method

Abstract

The invention relates to a heating and ventilation air purification system, an air conditioner and a control method, relates to the technical field of heating and ventilation air filtration and purification, and aims to solve the problem that an air purification system cannot continuously and stably filter and kill bacteria and viruses in air. The heating and ventilation air purification system comprises an indoor heat exchanger, a first filter, a second filter, a first heater, a second heater and a circulating fan. The circulating fan is used for driving air to flow through the indoor heat exchanger, the first filter and the second filter, and the first filter and the second filter are efficient air filters. In the air flowing direction, the first filter and the first heater are arranged on one side of the indoor heat exchanger, and the first filter is located on the downstream of the first heater. In the air flowing direction, the second filter and the second heater are arranged on one side of the indoor heat exchanger, the second filter and the first filter are located on the same side of the indoor heat exchanger and arranged in a separated mode, and the second filter is located on the downstream of the second heater.

Description

Technical Field

[0001] This application relates to the field of HVAC air filtration and purification technology, and in particular to an HVAC air purification system, an air conditioner, and a control method. Background Technology

[0002] When HVAC equipment such as air conditioners, air circulation systems, or fresh air systems are used for air purification, they typically employ high-efficiency particulate air (HEPA) filters to filter and intercept bacteria and viruses in the air. However, HEPA filters can only filter and intercept bacteria and viruses; they cannot kill them. In fact, they can increase the concentration of bacteria and viruses at the filter, creating a new source of pollution. Prolonged use poses safety hazards. Summary of the Invention

[0003] This application provides a heating, ventilation, and air purification system, an air conditioner, and a control method, aiming to solve the problem that air purification systems cannot continuously and stably filter and kill bacteria and viruses in the air.

[0004] On one hand, this application provides a heating, ventilation, and air purification system, including an indoor heat exchanger, a first filter, a second filter, a first heater, a second heater, and a circulating fan. The circulating fan drives airflow through the indoor heat exchanger, the first filter, and the second filter, which are high-efficiency air filters. Along the airflow direction, the first filter and the first heater are disposed on one side of the indoor heat exchanger, with the first filter located downstream of the first heater. Along the airflow direction, the second filter and the second heater are disposed on one side of the indoor heat exchanger, with the second filter and the first filter located on the same side of the indoor heat exchanger but separated, and the second filter located downstream of the second heater.

[0005] In some embodiments, the HVAC air purification system includes an outdoor heat exchanger, a compressor, and a throttling device. The indoor heat exchanger, compressor, outdoor heat exchanger, and throttling device are connected to form a refrigerant circulation loop. A first heater includes a first heat exchanger and a first switching valve. The first heat exchanger and the first switching valve are connected in series and then in parallel across the outdoor heat exchanger. The first switching valve controls the refrigerant flow through either the first heat exchanger or the outdoor heat exchanger. A second heater includes a second heat exchanger and a second switching valve. The second heat exchanger and the second switching valve are connected in series and then in parallel across the outdoor heat exchanger. The second switching valve controls the refrigerant flow through either the second heat exchanger or the outdoor heat exchanger.

[0006] In some embodiments, the first heater includes a first electric heating element disposed upstream of the first filter along the airflow direction for heating the first filter. The second heater includes a second electric heating element disposed upstream of the second filter along the airflow direction for heating the second filter.

[0007] In some embodiments, the HVAC air purification system further includes a control module, a first temperature sensor, and a second temperature sensor. The first temperature sensor is located at a first filter, and the second temperature sensor is located at a second filter. The control module is electrically connected to the first temperature sensor, the second temperature sensor, a first switching valve, a second switching valve, a first electric heating element, and a second electric heating element.

[0008] In some implementations, the HVAC air purification system also includes a four-way valve with four ports for switching between heating and cooling modes of the refrigerant circulation loop. The compressor's inlet and outlet are connected sequentially to the first and second ports of the four-way valve. One end of the indoor heat exchanger is sequentially connected to a throttling device and one end of the outdoor heat exchanger; the other end of the indoor heat exchanger is connected to the third port of the four-way valve, and the other end of the outdoor heat exchanger is connected to the fourth port of the four-way valve.

[0009] In some embodiments, the HVAC air purification system includes a housing with a heat exchange chamber, a first filter chamber, and a second filter chamber. An indoor heat exchanger is disposed within the heat exchange chamber, a first filter and a first heater are disposed within the first filter chamber, and a second filter and a second heater are disposed within the second filter chamber. Along the airflow direction, the first and second filter chambers are connected upstream of the heat exchange chamber, and are isolated from each other.

[0010] In some embodiments, the housing is provided with a first return air inlet, a second return air inlet, and an air outlet. Along the airflow direction, the air outlet connects to the side of the heat exchange chamber away from the first filter chamber, the first return air inlet connects to the side of the first filter chamber away from the heat exchange chamber, and the second return air inlet connects to the side of the second filter chamber away from the heat exchange chamber. The HVAC air purification system includes at least two third filters, with the third filters installed at the first and second return air inlets.

[0011] In some embodiments, the housing includes a first damper, a second damper, and a control module. The first damper is located at a first return air inlet. The second damper is located at a second return air inlet. The control module is electrically connected to the first and second dampers and is used to independently adjust the opening of the first and second return air inlets.

[0012] In some implementations, the first and second filters are configured as removable structures.

[0013] Secondly, embodiments of this application also provide an air conditioner, including the HVAC air purification system described in the first aspect.

[0014] Thirdly, embodiments of this application also provide a control method for a heating, ventilation, and air purification system, applied to the heating, ventilation, and air purification system in the first aspect, the control method comprising: Control the HVAC air purification system to operate in high-temperature purification mode.

[0015] Determine whether the first filter needs self-cleaning.

[0016] If the first filter requires self-cleaning, control the first heater to start so that the first filter is heated to the purification temperature and the first filter is kept at the purification temperature for at least a first preset time.

[0017] If the first filter does not require self-cleaning, the second heater is activated to heat the second filter to the purification temperature, and the second filter maintains the purification temperature for at least a second preset time.

[0018] In some embodiments, controlling the activation of the first heater to heat the first filter to the purification temperature includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode.

[0019] If the indoor heat exchanger is in evaporative heat absorption mode, adjust the first switching valve to direct the refrigerant in the compressor to the first heat exchanger.

[0020] If the indoor heat exchanger is not in evaporative heat absorption mode, the first electric heating element will be activated.

[0021] In some embodiments, after adjusting the first switching valve or activating the first electric heating element, controlling the first heater to start so that the first filter is heated to the purification temperature further includes: After the first heater heats the first filter for a second preset time, it is determined whether the temperature of the first filter is within the fluctuation range of the purification temperature.

[0022] If the temperature of the first filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0023] If the temperature of the first filter is lower than the fluctuation range of the purification temperature, the airflow through the first filter should be reduced.

[0024] If the temperature of the first filter is higher than the fluctuation range of the purification temperature, the airflow through the first filter will be increased.

[0025] In some embodiments, when the first filter is heated by the first heat exchanger, controlling the start of the first heater to heat the first filter to the purification temperature further includes: After the first heat exchanger heats the first filter for a second preset time, it is determined whether the temperature of the first filter is within the fluctuation range of the purification temperature.

[0026] If the temperature of the first filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0027] If the temperature of the first filter is lower than the fluctuation range of the purification temperature, the flow rate of the refrigerant flowing through the first heat exchanger will be increased.

[0028] If the temperature of the first filter is higher than the fluctuation range of the purification temperature, the flow rate of refrigerant flowing through the first heat exchanger should be reduced.

[0029] In some embodiments, controlling the activation of the second heater to heat the second filter to the purification temperature includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode.

[0030] If the indoor heat exchanger is in evaporative heat absorption mode, adjust the second switching valve to direct the refrigerant in the compressor to the second heat exchanger.

[0031] If the indoor heat exchanger is not in evaporative heat absorption mode, the control will start the second electric heating element.

[0032] After the second heater heats the second filter for a second preset time, it is determined whether the temperature of the second filter is within the fluctuation range of the purification temperature.

[0033] If the temperature of the second filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0034] If the temperature of the second filter is lower than the fluctuation range of the purification temperature, control and reduce the airflow through the second filter.

[0035] If the temperature of the second filter is higher than the fluctuation range of the purification temperature, control the increase of the airflow through the second filter.

[0036] In some embodiments, controlling the activation of the second heater to heat the second filter to the purification temperature includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode.

[0037] If the indoor heat exchanger is in evaporative heat absorption mode, adjust the second switching valve to direct the refrigerant in the compressor to the second heat exchanger.

[0038] After the second heat exchanger heats the second filter for a second preset time, it is determined whether the temperature of the second filter is within the fluctuation range of the purification temperature.

[0039] If the temperature of the second filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0040] If the temperature of the second filter is lower than the fluctuation range of the purification temperature, control the increase of the refrigerant flow through the second heat exchanger.

[0041] If the temperature of the second filter is higher than the fluctuation range of the purification temperature, control the reduction of the refrigerant flow through the second heat exchanger.

[0042] The technical solutions provided in this application have the following advantages compared with the prior art: The separation of the first and second filters places the first filter and first heater within two isolated air ducts, while the second filter and second heater remain off. When the first filter is heated by the first heater for high-temperature sterilization, the second heater remains off. During this process, even if the air duct containing the first filter needs to maintain a high temperature to reduce airflow, the airflow can be increased or maintained constant through the air duct containing the second filter, thus maintaining or slightly reducing the overall air circulation volume of the HVAC air purification system. Similarly, when the second filter performs high-temperature sterilization, the first filter, with its independent air duct, can also maintain or slightly reduce the overall air circulation volume of the HVAC air purification system. This allows the first and second filters to serve as backups for each other, enabling the execution of a high-temperature self-cleaning mode at different times, ensuring that the overall ventilation capacity of the equipment remains constant or only slightly reduced, thus maintaining stable ventilation performance of the entire unit.

[0043] In this way, by installing a heater, the filter can be heated to the purification and sterilization temperature required to kill viruses. This effectively eliminates active microorganisms such as viruses and bacteria captured and accumulated on the filter, thereby achieving filtration, interception, and inactivation of viruses and bacteria. This avoids the risk of high-concentration biological contamination sources forming after long-term use of HEPA filters. This allows the HVAC air purification system to continuously and stably filter and kill bacteria and viruses in the circulating air using HEPA filters without the need for repeated filter replacements, significantly improving the safety of circulating ventilation and reducing the risk of infection during filter replacement.

[0044] Based on this, by separating the first and second filters, either the first or second filter can be heated and purified within an independent air duct, without affecting the airflow of the unpurified filter in the other air duct. This ensures that the overall air circulation volume of the HVAC air purification system remains constant or only slightly decreases, thus maintaining stable operation under normal conditions such as cooling, heating, dehumidification, or fresh air circulation. In other words, the alternating self-cleaning purification of the first and second filters does not affect the stable operation of the HVAC air purification system under normal conditions, which helps improve the stability of continuous operation of the HVAC air purification system and enhances the user experience. Attached Figure Description The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0047] Figure 1 This is a schematic diagram of the structure of a heating, ventilation, and air purification system provided in an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of an internal structure within the casing shown in the image; Figure 3 This application provides an electrical connection diagram of an HVAC air purification system as an embodiment of the present application. Figure 4 This is a schematic diagram of the overall structure of a heating, ventilation, and air purification system provided in an embodiment of this application; Figure 5 A schematic diagram of the connection structure of a refrigerant circulation system provided in an embodiment of this application; Figure 6 A flowchart illustrating a first control method for a HVAC air purification system provided in this application embodiment; Figure 7 A flowchart illustrating a second control method for a HVAC air purification system provided in this application embodiment; Figure 8 A flowchart illustrating a third control method for a HVAC air purification system provided in this application embodiment; Figure 9 This is a schematic diagram of the connection structure of a control module provided in an embodiment of this application.

[0048] Explanation of reference numerals in the attached figures: 100. Heating, ventilation, and air purification system; 10. Refrigerant circulation loop; 11. Indoor heat exchanger; 12. Outdoor heat exchanger; 13. Compressor; 14. Throttle valve; 15. Four-way valve; 151. First port; 152. Second port; 153. Third port; 154. Fourth port; 21. First filter; 22. First heater; 221. First heat exchanger; 222. First switching valve; 223. First electric heating element; 31. Second filter; 32. Second heater; 321. Second heat exchanger; 322. Second switching valve; 323. Second electric heating element; 41. Circulating fan; 42. Third filter; 50. Housing; 51. Heat exchange chamber; 52. First filter chamber; 53. Second filter chamber; 54. Air outlet; 55. First return air outlet; 56. Second return air outlet; 57. First damper; 58. Second damper; 61. Control module; 611. Processor; 612. Communication interface; 613. Memory; 614. Communication bus; 62. First temperature sensor; 63. Second temperature sensor; 64. Third temperature sensor. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0051] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0052] Please see Figures 1 to 9 This application provides a heating, ventilation, and air purification system, an air conditioner, and a control method, aiming to solve the problem that air purification systems cannot continuously and stably filter and kill bacteria and viruses in the air.

[0053] Firstly, such as Figure 1 As shown, this application provides a heating, ventilation, and air purification system 100, including an indoor heat exchanger 11, a first filter 21, a second filter 31, a first heater 22, a second heater 32, and a circulating fan 41. The circulating fan 41 is used to drive airflow through the indoor heat exchanger 11, the first filter 21, and the second filter 31, wherein the first filter 21 and the second filter 31 are high-efficiency air filters.

[0054] High-efficiency particulate air (HEPA) filters are core filtration devices in the air purification field, boasting a filtration efficiency of up to 99.97% for particles with a diameter of 0.3 micrometers. Through mechanisms such as physical interception, inertial impaction, and diffusion adsorption of the filter media, HEPA filters can deeply filter suspended solid particles (such as dust, pollen, bacteria, and viruses) in the air, precisely intercepting tiny pollutants and providing clean air for indoor or industrial settings. By setting the first filter 21 and the second filter 31 as HEPA filters, the circulating fan 41 drives airflow through the first filter 21 and the second filter 31, effectively filtering and intercepting tiny particles such as viruses and bacteria in the air, thus providing a clean and hygienic indoor environment. This improves user comfort while helping to reduce bacterial and viral infection rates, offering excellent hygiene protection.

[0055] For example, the high-efficiency air filter can adopt a plate and frame structure, a pleated structure, or a cylindrical structure. The structural forms of the first filter 21 and the second filter 31 can be flexibly adjusted according to the installation position requirements, and there is no limitation thereto. The filter element material of the high-efficiency air filter can be a glass fiber filter element, a polytetrafluoroethylene microporous membrane, or a meltblown nonwoven fabric, and can be flexibly selected according to the filtration level, and there is no limitation thereto.

[0056] The circulating fan 41 can be installed upstream or downstream of the indoor heat exchanger 11, and the relative installation position of the circulating fan 41 and the indoor heat exchanger 11 can be flexibly adjusted according to actual needs. Taking a cross-flow fan structure as an example, by setting the circulating fan 41 downstream of the indoor heat exchanger 11, a negative pressure zone is formed downstream of the indoor heat exchanger 11, so that air circulates through the indoor heat exchanger 11 to regulate temperature and humidity.

[0057] Continue to refer to Figure 1 Along the airflow direction, the first filter 21 and the first heater 22 are disposed on one side of the indoor heat exchanger 11, with the first filter 21 located downstream of the first heater 22. Along the airflow direction, the second filter 31 and the second heater 32 are disposed on one side of the indoor heat exchanger 11, with the second filter 31 and the first filter 21 located on the same side of the indoor heat exchanger 11 but separated, and the second filter 31 located downstream of the second heater 32.

[0058] The first filter 21 and the second filter 31 can be located on the same side, upstream or downstream of the indoor heat exchanger 11, and both can intercept and filter bacteria, viruses, or small particulate matter in the circulating air. For example, the first filter 21 and the second filter 31 can both be located upstream of the indoor heat exchanger 11, and the circulating fan 41 can be located downstream of the indoor heat exchanger 11. This allows the circulating fan to drive air circulation to regulate temperature and humidity and filter out small particulate matter, preventing bacteria, viruses, or small particulate matter from contacting and contaminating the indoor heat exchanger 11 and the circulating fan 41, thus maintaining a high level of cleanliness for both.

[0059] like Figure 1 As shown, on the same side of the indoor heat exchanger 11, the first filter 21 and the second filter 31 are arranged separately. For example, two parallel independent air ducts are arranged upstream of the indoor heat exchanger 11 to accommodate the first filter 21 and the second filter 31. The first heater 22 is located in the same air duct as the first filter 21, and upstream of the first filter 21. It is used to preheat the air flowing through the first filter 21 to kill viruses and bacteria accumulated at the first filter 21 through high-temperature disinfection, thereby achieving high-temperature self-cleaning of the first filter 21. The second heater 32 is located in the same air duct as the second filter 31, and upstream of the second filter 31. It is used to preheat the air flowing through the second filter 31 to kill viruses and bacteria accumulated at the second filter 31 through high-temperature disinfection, thereby achieving high-temperature self-cleaning of the second filter 31.

[0060] Since the effective killing temperature for bacteria and viruses is usually above 60℃, for example, the novel coronavirus can be killed and disinfected by maintaining a high temperature above 56℃ for half an hour. The commonly used pasteurization method has a killing temperature between 63-85℃ and is maintained for 15 seconds to 30 minutes. Because the circulating fan 41 continuously drives air through the first filter 21 and the second filter 31, if it is necessary to maintain the first filter 21 and the second filter 31 at around 60℃ or above for a long time, the amount of air flowing through the first filter 21 and the second filter 31 needs to be significantly reduced to minimize heat loss. However, this will reduce the air circulation volume of the HVAC air purification system 100, thereby affecting the cooling, heating, dehumidification, or fresh air circulation effects of the HVAC air purification system 100.

[0061] Based on this, the separation of the first filter 21 and the second filter 31 places the first filter 21 and the first heater 22 within two isolated air ducts, while the second filter 31 and the second heater 32 are located within two isolated air ducts. When the first filter 21 is heated by the first heater 22 for high-temperature sterilization, the second heater 32 remains off. During this process, even if the air duct containing the first filter 21 needs to maintain a high temperature to reduce airflow, the airflow can be increased or kept constant through the air duct containing the second filter 31, so that the overall air circulation volume of the HVAC air purification system 100 remains constant or only slightly decreases. When the second filter 31 performs high-temperature sterilization, the first filter 21, combined with its independent air duct, can similarly maintain the overall air circulation volume of the HVAC air purification system 100 constant or only slightly decreases. This allows the first filter 21 and the second filter 31 to be used as backups for each other, enabling the high-temperature self-cleaning mode to be executed in time periods, ensuring that the overall ventilation capacity of the equipment remains constant or only slightly decreases, thus maintaining a stable ventilation state for the entire unit.

[0062] Thus, by using a heater, the filter can be heated to the purification and sterilization temperature required to kill viruses. This effectively eliminates active microorganisms such as viruses and bacteria captured and accumulated on the filter, thereby achieving filtration, interception, and inactivation of viruses and bacteria. This avoids the risk of high-concentration biological contamination sources forming after long-term use of high-efficiency air filters. As a result, the HVAC air purification system 100 can continuously and stably filter and kill bacteria and viruses in the circulating air using high-efficiency air filters without the need for repeated filter replacements, significantly improving the safety of circulating ventilation and reducing the risk of infection when replacing filters.

[0063] Based on this, by separating the first filter 21 and the second filter 31, either the first filter 21 or the second filter 31 can be heated and purified in an independent air duct without affecting the airflow of the unpurified filter in the other air duct. This ensures that the overall air circulation volume of the HVAC air purification system 100 remains constant or only slightly decreases, thereby maintaining stable operation under normal conditions such as cooling, heating, dehumidification, or fresh air circulation. In other words, the alternating self-cleaning purification of the first filter 21 and the second filter 31 does not affect the stable operation of the HVAC air purification system 100 under normal conditions, which helps improve the stability of the continuous operation of the HVAC air purification system 100 and enhances the user experience.

[0064] Specifically, the design utilizes a heater to treat the filter surface at high temperatures, avoiding the risk of high-concentration biological contaminants forming after long-term use of traditional high-efficiency filters. The separate dual filtration paths ensure the system's continuous operation during the self-cleaning process, meeting the needs of both normal and emergency scenarios.

[0065] For example, such as Figure 1 and Figure 2 As shown, the HVAC air purification system 100 includes a housing 50, which has a heat exchange chamber 51, a first filter chamber 52, and a second filter chamber 53. An indoor heat exchanger 11 is disposed within the heat exchange chamber 51, a first filter 21 and a first heater 22 are disposed within the first filter chamber 52, and a second filter 31 and a second heater 32 are disposed within the second filter chamber 53. Along the airflow direction, the first filter chamber 52 and the second filter chamber 53 are connected upstream of the heat exchange chamber 51, and are isolated from each other. This allows the first filter chamber 52 and the second filter chamber 53 to function as two return air ducts connected in parallel upstream of the heat exchange chamber 51.

[0066] The housing 50 can be the indoor housing of the HVAC air purification system 100, serving as an outer shell structure to house and protect the internal components of the system. It can be made of metal or high-strength plastic to provide physical isolation and support. The heat exchange chamber 51 is an independent spatial unit housing the indoor heat exchanger 11. It is separated from other chambers by partitions or other separating structures, thereby concentrating the heat exchange process and reducing interference to other areas. The circulating fan 41 is also located within the heat exchange chamber 51 to reduce the negative pressure gap between the circulating fan 41 and the indoor heat exchanger 11, which helps to increase the air circulation volume.

[0067] Furthermore, the first filter chamber 52 and the second filter chamber 53 are located upstream of the heat exchange chamber 51 along the airflow direction and are isolated from each other to form an independent return air duct structure. This design not only conforms to the logical sequence of air purification, preventing unfiltered airborne bacteria and viruses from contaminating the indoor heat exchanger 11, but also ensures that while one filter chamber is undergoing high-temperature purification, the other filter chamber can continue to process the airflow without interference, significantly improving the system's continuous operation capability and purification reliability. This avoids the problem of a significant reduction in the overall air circulation volume caused by a large decrease in airflow during high-temperature purification of a single filter chamber, allowing the HVAC air purification system 100 to maintain normal operation in cooling, heating, dehumidification, or fresh air circulation modes.

[0068] In some embodiments, such as Figure 2 and Figure 4 As shown, the housing 50 is provided with a first return air inlet 55, a second return air inlet 56, and an air outlet 54. Along the airflow direction, the air outlet 54 is connected to the side of the heat exchange chamber 51 away from the first filter chamber 52, the first return air inlet 55 is connected to the side of the first filter chamber 52 away from the heat exchange chamber 51, and the second return air inlet 56 is connected to the side of the second filter chamber 53 away from the heat exchange chamber 51.

[0069] Thus, driven by the circulating fan 41, air circulates through the casing 50. One path of air flows through the first filter chamber 52, sequentially passing through the first heater 22, the first filter 21, and the indoor heat exchanger 11 within the heat exchange chamber 51, so that the filtered and heat-exchanged air is blown out through the air outlet 54 to improve the indoor environment. The other path of air flows through the second filter chamber 53, sequentially passing through the second heater 32, the second filter 31, and the indoor heat exchanger 11 within the heat exchange chamber 51, so that the filtered and heat-exchanged air is blown out through the air outlet 54 to improve the indoor environment. This dual-path air duct filtration and heat exchange structure improves the overall continuous operation capability and stability of the HVAC air purification system 100.

[0070] Continue to refer to Figure 4 The HVAC air purification system 100 includes at least two third filters 42, which are installed at the first return air inlet 55 and the second return air inlet 56. By installing a pre-filtration device upstream of the first filter 21 and the second filter 31, such as a coarse filter screen or multi-layer fiber filter media, the third filter 42 can intercept large particulate matter and coarse pollutants in the air, reducing their entry into the first filter 21 and the second filter 31, thereby reducing the clogging rate of the first filter 21 and the second filter 31 and extending the high-temperature self-cleaning cycle.

[0071] The first filter 21 and the second filter 31 are configured as detachable structures. For example, the first filter chamber 52 and the second filter chamber 53 are equipped with guide rail structures, and the side walls of the first filter chamber 52 and the second filter chamber 53 are provided with replaceable doors that can be opened and closed, so that the first filter 21 can be inserted and installed in the first filter chamber 52 at an angle perpendicular to the airflow direction, and the second filter 31 can be inserted and installed in the second filter chamber 53 at an angle perpendicular to the airflow direction. Alternatively, the first filter 21 and the second filter 31 can be fixed by snap-fit ​​connection, screw connection, or magnetic installation.

[0072] During the air purification process, the first filter 21 and the second filter 31 capture a large number of bacteria, viruses and other microorganisms, forming a high concentration of pollution sources. By setting the two filters to be detachable, they can be easily replaced directly, so as to serve as a backup emergency scenario when the high-temperature purification function cannot be used normally.

[0073] Furthermore, since the HVAC air purification system 100 does not require filtration of bacteria and viruses in most cases, the first filter 21 and the second filter 31 can be temporarily removed to reduce the airflow resistance of the air circulation system and avoid further extending the lifespan of the first filter 21 and the second filter 31. Moreover, when high-efficiency filtration is required, the first filter 21 and the second filter 31 can be quickly installed to effectively filter and intercept bacteria, viruses, and fine particulate matter.

[0074] Furthermore, the third filter 42 is also configured as a detachable structure. The third filter 42 can be installed via snap-fit, guide rail, screw connection, or magnetic connection, facilitating replacement or cleaning even after it reaches the end of its service life.

[0075] In some embodiments, such as Figure 2 As shown, the housing 50 also includes a first damper 57 and a second damper 58. The first damper 57 is located at the first return air inlet 55 and is an electrically controlled damper used to adjust the opening of the first return air inlet 55. The second damper 58 is located at the second return air inlet 56 and is an electrically controlled damper used to adjust the opening of the second return air inlet 56.

[0076] The first damper 57 and the second damper 58 can be configured as one or two of the following structures: louvered structure, sliding door structure, and revolving door structure. They can be used in conjunction with an electric structure such as a cylinder or motor to achieve rotation and sliding adjustment of the door body, thereby independently and flexibly adjusting the opening degree of the first return air inlet 55 and the second return air inlet 56. This changes the airflow entering the first filter chamber 52 and the second filter chamber 53.

[0077] For example, when a filter in a high-temperature purification state is detected to have a temperature lower than the purification temperature, the opening of the corresponding damper can be reduced to decrease airflow and allow the filter temperature to rise. When a filter in a high-temperature purification state has an excessively high temperature, the opening can be increased to introduce more air to assist in heat dissipation, thereby maintaining the filter temperature within the range effective for virus inactivation. This dual-damper design, combined with the aforementioned multi-chamber structure, enables the system to dynamically allocate airflow according to real-time purification needs, significantly improving the accuracy and reliability of temperature control.

[0078] When the first filter 21 needs to be heated and purified, the opening of the first damper 57 can be reduced to reduce the inflow of external cold air. This allows a small amount of air to diffuse heat from the first heater 22 to the first filter 21 to maintain the high-temperature sterilization state of the first filter 21, and avoids excessive air carrying away too much heat from the first filter 21. This allows the first filter 21 to maintain a stable purification temperature for a long time, which is used for the effective sterilization of bacteria and viruses.

[0079] When the second filter 31 needs to be heated and purified, the opening of the second damper 58 can be reduced to reduce the inflow of external cold air. This allows a small amount of air to diffuse heat from the second heater 32 to the second filter 31 to maintain the high-temperature sterilization state of the second filter 31, and avoids excessive air carrying away too much heat from the second filter 31. This allows the second filter 31 to maintain a stable purification temperature for a long time, which is used for the effective sterilization of bacteria and viruses.

[0080] For example, such as Figure 3 As shown, the HVAC air purification system 100 also includes a control module 61, a first temperature sensor 62, and a second temperature sensor 63. The first temperature sensor 62 is disposed in the first filter 21 (e.g., Figure 1 (As shown) a location for detecting the real-time temperature of the first filter 21. A second temperature sensor 63 is located at the second filter 31 and is used to detect the real-time temperature of the second filter 31. The control module 61 is electrically connected to the first temperature sensor 62 and the second temperature sensor 63 to acquire the real-time temperatures of the first filter 21 and the second filter 31.

[0081] For example, such as Figure 3 As shown, the control module 61 is also electrically connected to the first damper 57 and the second damper 58. This allows the control module 61 to adjust the opening of the first return air vent 55 via the first damper 57 and the opening of the second return air vent 56 via the second damper 58. In other words, the control module 61 can independently adjust and control the opening of the first return air vent 55 and the second return air vent 56.

[0082] In the high-temperature purification mode, the airflow within the filter chamber is controlled in real time by adjusting the opening of the corresponding return air vent. When the filter temperature is low in the high-temperature purification mode, the airflow is reduced by decreasing the opening of the corresponding return air vent, thereby reducing heat loss from the filter and increasing the temperature. When the filter temperature is high in the high-temperature purification mode, the airflow is increased by increasing the opening of the corresponding return air vent, thereby increasing heat loss from the filter and decreasing the temperature. Thus, through the adaptive control of the control module 61, the first temperature sensor 62, and the second temperature sensor 63, the automated control and adjustment of the first filter 21 and the second filter 31 in the high-temperature purification mode are achieved.

[0083] In the embodiments of this application, the filter can be heated by various heating methods to achieve high-temperature purification and reuse of the filter.

[0084] like Figure 4 and Figure 5As shown, the HVAC air purification system 100 includes an outdoor heat exchanger 12, a compressor 13, and a throttling device 14. The indoor heat exchanger 11, compressor 13, outdoor heat exchanger 12, and throttling device 14 are connected to form a refrigerant circulation loop 10. Thus, the compressor 13 performs work to drive the refrigerant to circulate between the indoor heat exchanger 11 and the outdoor heat exchanger 12, thereby exchanging and transporting heat near the indoor heat exchanger 11 and the outdoor heat exchanger 12. This achieves highly efficient heating and cooling of the air at the indoor heat exchanger 11, resulting in a very high energy efficiency ratio.

[0085] Based on this, such as Figure 1 , Figure 4 and Figure 5 As shown, the first heater 22 includes a first heat exchanger 221 and a first switching valve 222. The first heat exchanger 221 and the first switching valve 222 are connected in series to form a branch, which is connected in parallel to both ends of the outdoor heat exchanger 12. The first switching valve 222 is used to control the flow of refrigerant through the first heat exchanger 221 or the outdoor heat exchanger 12. The second heater 32 includes a second heat exchanger 321 and a second switching valve 322. The second heat exchanger 321 and the second switching valve 322 are connected in series to form a branch, which is connected in parallel to both ends of the outdoor heat exchanger 12. The second switching valve 322 is used to control the flow of refrigerant through the second heat exchanger 321 or the outdoor heat exchanger 12.

[0086] like Figure 5 As shown, taking the first heat exchanger 221 and the first switching valve 222 as the first filtration cooling branch, and the second heat exchanger 321 and the second switching valve 322 as the second filtration cooling branch, the first and second filtration cooling branches are connected in parallel with the outdoor heat exchanger 12, so that the two cooling branches are part of the refrigerant circulation loop 10. When the HVAC air purification system 100 is in cooling mode, the first switching valve 222 can be adjusted so that the refrigerant flowing out of the compressor 13 can flow and exchange heat between the first heat exchanger 221 and the indoor heat exchanger 11, thereby preheating the air flowing through the first filter 21, so that the first filter 21 enters the high-temperature purification mode, and is heated by the heat pump. This not only has a very high energy efficiency ratio, but also reuses the preheating that would otherwise be wasted, significantly improving energy utilization efficiency and avoiding or reducing the additional energy consumption caused by electric heating.

[0087] It should be noted that in actual products, the HVAC air purification system 100 may not have defined cooling and heating modes. In this embodiment, the cooling mode refers to the condition where the refrigerant in the indoor heat exchanger 11 is evaporating and absorbing heat, while the refrigerant condenses and releases heat in the outdoor heat exchanger 12. Correspondingly, the heating mode refers to the condition where the refrigerant in the indoor heat exchanger 11 is condensing and releasing heat, while the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 12.

[0088] Correspondingly, when the second filter 31 needs to perform high-temperature purification mode, the second switching valve 322 can be adjusted so that the refrigerant flowing out of the compressor 13 can flow and exchange heat between the second heat exchanger 321 and the indoor heat exchanger 11, thereby preheating the air flowing through the second filter 31 so that the second filter 31 can enter the high-temperature purification mode and be heated by the heat pump, which also improves the energy utilization efficiency.

[0089] Thus, in this application, by setting up the first heat exchanger 221 and the second heat exchanger 321, when the refrigerant is in the evaporation and heat absorption state in the indoor heat exchanger 11, the switching control of the first switching valve 222 and the second switching valve 322 allows the vaporized refrigerant to partially or completely flow to the first heat exchanger 221 or the second heat exchanger 321, so as to heat and purify the first filter 21 or the second filter 31 through the heat release process of refrigerant liquefaction. When the system is in normal operating mode, this heat is usually dissipated and lost at the outdoor heat exchanger 12. This application, by setting up the first heat exchanger 221 and the second heat exchanger 321 to reuse this lost heat for heating and purification of the first filter 21 or the second filter 31, can significantly improve energy utilization efficiency and overall energy efficiency ratio without additional energy consumption, achieving two benefits at once.

[0090] For example, the first heat exchanger 221 and the second heat exchanger 321 can be finned heat exchangers, which improve heat exchange efficiency by using a larger contact area while avoiding affecting the wind resistance upstream of the first filter 21 and the second filter 31.

[0091] Correspondingly, the first switching valve 222 and the second switching valve 322 can be two two-position three-way valves. By switching the operating position of the two-position three-way valves, the refrigerant can flow through the first heat exchanger 221 (second heat exchanger 321) or the outdoor heat exchanger 12, which helps to reduce the number of components in the HVAC air purification system 100.

[0092] Alternatively, the first switching valve 222 and the second switching valve 322 can be two two-position two-way valves, such as ball valves, gate valves, or butterfly valves, which are electrically controlled. When both the first switching valve 222 and the second switching valve 322 are closed, the refrigerant circulates between the indoor heat exchanger 11 and the outdoor heat exchanger 12, and the HVAC air purification system 100 operates under normal cooling, heating, or dehumidification conditions. Cooling and dehumidification conditions refer to the conditions where the refrigerant in the indoor heat exchanger 11 evaporates and absorbs heat. Heating conditions refer to the conditions where the refrigerant in the indoor heat exchanger 11 liquefies and releases heat.

[0093] When the first switching valve 222 is open and the second switching valve 322 is closed, the refrigerant in cooling mode flows from the first heat exchanger 221 to the indoor heat exchanger 11, so that the first filter 21 is in high-temperature purification mode. When the first switching valve 222 is closed and the second switching valve 322 is open, the refrigerant in cooling mode flows from the second heat exchanger 321 to the indoor heat exchanger 11, so that the second filter 31 is in high-temperature purification mode. The structure is simple.

[0094] For example, such as Figure 3 As shown, the control module 61 is also electrically connected to the first switching valve 222 and the second switching valve 322, and is used to independently control the opening and closing states of the first switching valve 222 and the second switching valve 322, thereby controlling whether the first filter 21 or the second filter 31 enters the high-temperature purification mode.

[0095] When the HVAC air purification system 100 is in heating mode, the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 12, thus providing cooling. At this time, the filter cannot be heated by the first heat exchanger 221 and the second heat exchanger 321. Based on this, as... Figure 1 and Figure 4 As shown, the first heater 22 includes a first electric heating element 223, which is positioned upstream of the first filter 21 along the airflow direction. For example, the first electric heating element 223 can be positioned upstream or downstream of the first heat exchanger 221. The first electric heating element 223 is used to heat the first filter 21. The second heater 32 includes a second electric heating element 323, which is positioned upstream of the second filter 31 along the airflow direction. For example, the second electric heating element 323 can be positioned upstream or downstream of the second heat exchanger 321. The second electric heating element 323 is used to heat the second filter 31.

[0096] The first electric heating element 223 and the second electric heating element 323 can be electrothermal conversion structures such as resistance wire, PTC heating element, or graphene heating film to directly convert electrical energy into heat energy. Their purpose is to provide a stable heat source independent of the refrigerant cycle, ensuring that the filter's purification temperature is maintained even in non-refrigeration conditions. The first electric heating element 223 can be located upstream or downstream of the first heat exchanger 221 to heat the air flowing towards the first filter 21. The second electric heating element 323 can be located upstream or downstream of the second heat exchanger 321 to heat the air flowing towards the second filter 31.

[0097] When the HVAC air purification system 100 is in heating mode, the first electric heating element 223 or the second electric heating element 323 can be activated to heat the air flowing towards the filter, thereby putting the corresponding first filter 21 or second filter 31 into a high-temperature purification mode. In this way, the high-temperature purification mode of the filter can be executed in heating, cooling, dehumidification, or defrosting modes, enabling the high-efficiency air filter to continuously and stably filter and intercept bacteria, viruses, and fine particulate matter during heating, cooling, dehumidification, or defrosting operations.

[0098] In addition, when the HVAC air purification system 100 is in a cooling mode, i.e., when the refrigerant in the indoor heat exchanger 11 is evaporating and absorbing heat, if a higher temperature is required at the filter to execute the high-temperature purification mode, or if the first heat exchanger 221 or the second heat exchanger 321 cannot effectively heat the filter, the filter can also be auxiliaryly heated by activating the corresponding first electric heating element 223 or the second electric heating element 323 to ensure the high-temperature purification effect of the filter.

[0099] Furthermore, the aforementioned first electric heating element 223 and second electric heating element 323 can also serve as auxiliary heating structures for the indoor heat exchanger 11 in heating mode to increase the outlet air temperature of the air outlet 54. That is, compared to the electric auxiliary heating structure in traditional solutions, this application, through independently configured first electric heating elements 223 and second electric heating elements 323, can individually heat and insulate the first filter 21 or the second filter 31, enabling it to perform a high-temperature purification mode and reducing the additional power consumption of simultaneously activating the first and second electric heating elements 223 and 323; alternatively, the first and second electric heating elements 223 can be activated simultaneously in heating mode to achieve the electric auxiliary heating effect. It offers multiple benefits while employing a separate electric heating structure, without increasing the complexity of the overall equipment.

[0100] Among them, such as Figure 3 As shown, the control module 61 is electrically connected to the first electric heating element 223 and the second electric heating element 323, so that the control module 61 can flexibly adjust the start-up state of the first electric heating element 223 and the second electric heating element 323 as needed.

[0101] In the above embodiments, the refrigerant circulation loop 10 is only in single-cycle mode, that is, the HVAC air purification system 100 can only perform heating or cooling operation.

[0102] In some embodiments, such as Figure 5As shown, the HVAC air purification system 100 also includes a four-way valve 15, which has four ports: a first port 151, a second port 152, a third port 153, and a fourth port 154. These four ports are used to change the flow direction of the refrigerant between the indoor heat exchanger 11 and the outdoor heat exchanger 12, thereby switching the refrigerant circulation loop 10 between heating and cooling modes. Figure 3 As shown, the control module 61 is electrically connected to the four-way valve 15 and is used to switch and regulate the conduction state of the four-way valve 15.

[0103] For example, the air inlet and outlet of the compressor 13 are connected in sequence to the first port 151 and the second port 152 of the four-way valve 15. One end of the indoor heat exchanger 11 is connected in sequence to the throttle valve 14 and one end of the outdoor heat exchanger 12. The other end of the indoor heat exchanger 11 is connected to the third port 153 of the four-way valve 15, and the other end of the outdoor heat exchanger 12 is connected to the fourth port 154 of the four-way valve 15.

[0104] By setting the four-way valve 15, the refrigerant circulation loop 10 can switch the refrigerant flow direction between the indoor heat exchanger 11 and the outdoor heat exchanger 12 through the four-way valve 15, so as to flexibly control the HVAC air purification system 100 to switch between cooling, heating, defrosting or defrosting conditions as needed, so as to adapt to the air conditioning purpose of different scenarios.

[0105] Based on this, when high-temperature self-cleaning is required, the system can switch to cooling mode through the four-way valve 15, thereby effectively utilizing the heat generated by the condenser to heat the filter, avoiding additional energy consumption and improving heat recovery efficiency.

[0106] It should be noted that, in this embodiment of the application, in the high-temperature purification mode, the actual temperature adjustment at the first filter 21 can be achieved by changing the opening degree of the first damper 57 or the rotation speed of the circulating fan 41 to adjust the airflow, thereby increasing or decreasing the heating temperature of the first filter 21. Alternatively, the flow rate of the refrigerant in the first heat exchanger 221 can be adjusted by adjusting the opening degree of the throttle 14, the operating power of the compressor 13, and the opening degree of the first switching valve 222 at the corresponding conduction position, thereby increasing or decreasing the heating temperature. The heating power of the first electric heating element 223 can also be adjusted to increase or decrease the heating temperature of the first filter 21. All these methods allow for flexible adjustment of the heating temperature at the first filter 21, and are not limited in this regard.

[0107] Correspondingly, in the high-temperature purification mode, the actual temperature adjustment at the second filter 31 can be achieved by changing the opening of the second damper 58 or the rotation speed of the circulating fan 41 to adjust the airflow, thereby increasing or decreasing the heating temperature of the second filter 31. Alternatively, the flow rate of the refrigerant in the second heat exchanger 321 can be adjusted by changing the opening of the throttle 14, the operating power of the compressor 13, and the opening of the second switching valve 322 in the on position, thereby increasing or decreasing the heating temperature. The heating power of the second electric heating element 323 can also be adjusted to increase or decrease the heating temperature at the second filter 31. All these methods allow for flexible adjustment of the heating temperature at the second filter 31, and are not limited in scope.

[0108] In some embodiments, the circulating fan 41 may further include a first fan and a second fan. The first fan is disposed in the first filter chamber 52 to drive air to flow sequentially through the first return air inlet 55, the third filter 42, the first filter 21, the indoor heat exchanger 11, and the air outlet 54. The second fan is disposed in the second filter chamber 53 to drive air to flow sequentially through the second return air inlet 56, the third filter 42, the second filter 31, the indoor heat exchanger 11, and the air outlet 54. At this time, the airflow at the first filter 21 and the second filter 31 can also be adjusted by adjusting the rotation speed of the first fan and the second fan. In the high-temperature purification mode, the heating temperature at the first filter 21 and the second filter 31 can also be adjusted so that the first filter 21 or the second filter 31 can be stably maintained within the purification temperature range to complete the first preset time of the high-temperature purification mode.

[0109] For example, such as Figure 3 As shown, the HVAC air purification system 100 also includes a third temperature sensor 64, which is located at the first return air vent 55 (e.g., Figure 1 (As shown) or at the second return air inlet 56, the third temperature sensor 64 is electrically connected to the control module and is used to detect the return air temperature parameter.

[0110] Secondly, embodiments of this application also provide an air conditioner, including the HVAC air purification system 100 described in the first aspect.

[0111] The components installed in the housing 50 of the HVAC air purification system 100, along with the housing 50 itself, can serve as part of the indoor air conditioning unit, providing a high filtration effect for circulating air while regulating indoor temperature and humidity.

[0112] Furthermore, since the air conditioner uses the HVAC air purification system 100 of the first aspect, it has at least all the beneficial effects brought about by the technical solution of the embodiment shown in the first aspect, which will not be repeated here.

[0113] Thirdly, embodiments of this application also provide a control method for a heating, ventilation, and air purification system, which can be used to control the heating, ventilation, and air purification system in the first aspect or the air conditioner in the second aspect. For example... Figure 6 and Figure 7 As shown, the control method includes the following steps: Control the HVAC air purification system to operate in high-temperature purification mode. This refers to the activation steps for starting the high-temperature purification mode.

[0114] Determine whether the first filter needs self-cleaning. This is the first determination step.

[0115] If the first filter requires self-cleaning, the first heater is activated to heat the first filter to the purification temperature and maintain the purification temperature for at least a first preset time. This is the first purification step.

[0116] If the first filter does not require self-cleaning, the second heater is activated to heat the second filter to the purification temperature, and the second filter maintains the purification temperature for at least a second preset time. This is the second purification step.

[0117] Users can initiate the startup process remotely or manually via a terminal device. Alternatively, the control module 61 can automatically initiate the startup process under preset conditions. These preset conditions can be the cumulative filtration time of the first filter 21 or the second filter 31, or the pressure difference parameter across the first filter 21 or the second filter 31. The cumulative filtration time can be timed using a built-in clock unit in the control module 61. The pressure difference parameter can be obtained by comparing pressure sensors on both sides of the filter, or it can be calculated based on the functional relationship between the rotational speed of the circulating fan 41 and the air circulation volume at the air outlet 54; there are no limitations on this.

[0118] After starting the system, the control module 61 can compare the cumulative filtration time of the first filter 21 or the pressure difference parameter on both sides with a preset value to determine whether the first filter 21 meets the standard for executing the high-temperature purification mode. If the cumulative filtration time or pressure difference parameter is greater than the preset value, it indicates that there are many accumulated pollutants at the first filter 21, requiring purification treatment, i.e., executing the first purification step. This involves activating the first heater 22 to heat the first filter 21, bringing it to the purification temperature and placing it in the high-temperature purification mode. This allows for the elimination of accumulated bacteria, viruses, and other microorganisms at the first filter 21 through a suitable purification temperature. This avoids affecting the filtration effect on the circulating air and allows the first filter 21 to be reused.

[0119] Otherwise, it indicates that there are too many pollutants accumulated at the second filter 31, requiring purification treatment, i.e., executing the second purification step. This is done by activating the second heater 32 to heat the second filter 31, bringing it to the purification temperature and placing it in a high-temperature purification mode. This allows for the elimination of bacteria, viruses, and other microorganisms accumulated at the second filter 31 through a suitable purification temperature. This avoids affecting the filtration effect on the circulating air and allows the second filter 31 to be reused.

[0120] It should be noted that in this embodiment, the purification temperature range can be 60-90℃. In practical applications, the purification temperature can be divided into three levels: high, medium, and low, which are 80-90℃, 70-80℃, and 60-70℃ respectively. The HVAC air purification system 100 defaults to the low purification temperature range to extinguish and disinfect the bacteria and viruses accumulated in the first filter 21 and the second filter 31 at a temperature range close to that of pasteurization.

[0121] Furthermore, the first preset duration can be 30-90 minutes, with a default setting of 30 minutes. This maintains good disinfection effectiveness while saving execution time in the high-temperature purification mode. The first preset duration refers to the cumulative time during which the actual temperatures of the first filter 21 and the second filter 31 are only greater than or equal to the corresponding purification temperature. Users can adjust the purification temperature and the first preset duration level via remote control or terminal devices to suit different filtration and purification needs.

[0122] Furthermore, since the control method of the HVAC air purification system is used to control the HVAC air purification system 100 in the first aspect, it has at least all the beneficial effects brought about by the technical solution of the embodiment shown in the first aspect, which will not be repeated here.

[0123] Specifically, such as Figure 7 and Figure 8 As shown, the first purification step includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode (i.e., cooling mode).

[0124] If the indoor heat exchanger is in evaporative heat absorption mode, adjust the first switching valve to direct the refrigerant in the compressor to the first heat exchanger.

[0125] If the indoor heat exchanger is not in evaporative heat absorption mode, the first electric heating element will be activated.

[0126] The control module 61 can monitor the operating status of the HVAC air purification system 100. When the HVAC air purification system 100 is in cooling mode, the refrigerant condenses and releases heat as it flows through the outdoor heat exchanger 12. By adjusting the first switching valve 222, the refrigerant flowing from the compressor 13 flows directly to the first heat exchanger 221 to heat the air upstream of the first filter 21. The heated air then flows through and heats the first filter 21. The first heat exchanger 221 can also heat the first filter 21 through contact heat exchange and thermal radiation, keeping the first filter 21 stably within the corresponding purification temperature range. This effectively kills bacteria, viruses, and other microorganisms accumulated on its surface at high temperatures, resulting in high heating efficiency and energy efficiency ratio.

[0127] If the HVAC air purification system 100 is not in cooling mode, meaning the refrigerant evaporates and absorbs heat as it flows through the outdoor heat exchanger 12, the first electric heating element 223 can be directly activated to heat the first filter 21, maintaining it stably within the corresponding purification temperature range. This effectively kills bacteria, viruses, and other microorganisms accumulated on the filter's surface at high temperatures, resulting in high heating efficiency and energy efficiency ratio. This expands the adaptable operating range of the high-temperature purification mode.

[0128] After adjusting the first switching valve 222 or activating the first electric heating element, such as Figure 7 and Figure 8 As shown, the first purification step also includes: After the first heater heats the first filter for a second preset time, it is determined whether the temperature of the first filter is within the fluctuation range of the purification temperature.

[0129] If the temperature of the first filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0130] If the temperature of the first filter is lower than the fluctuation range of the purification temperature, the airflow through the first filter should be reduced.

[0131] If the temperature of the first filter is higher than the fluctuation range of the purification temperature, the airflow through the first filter will be increased.

[0132] The second preset duration ranges from 10 to 60 seconds, and can be any time parameter within this range, such as 10s, 20s, 30s, 40s, 50s, or 60s. Through continuous monitoring of the second preset duration, if the actual temperature at the first filter 21 meets the corresponding purification temperature range, the current operating condition can be maintained until the next second preset duration, at which point the system will again assess whether the actual temperature of the first filter 21 meets the requirements. The high-temperature purification mode ends when the sum of multiple satisfying second preset durations is greater than or equal to the first preset duration.

[0133] It should be noted that when determining whether the actual temperature of the first filter 21 meets the requirements, a first fluctuation parameter can be set for the upper and lower values ​​of the purification temperature range. This first fluctuation parameter can be any value between 0 and 5, and the preset value of the first fluctuation parameter can be adjusted according to actual needs.

[0134] For example, the purification temperature range for the low setting is 60-70℃, and the preset first fluctuation parameter is 5. That is, the judgment range for the actual temperature of the first filter 21 to meet the requirements should be 55-75℃ (i.e., the fluctuation range of the purification temperature). The actual temperature within this range is considered to meet the requirements, that is, there is no need to adjust the operating conditions.

[0135] Furthermore, if, after the second preset time, the actual temperature of the first filter 21 is greater than or less than the corresponding purification temperature range, the actual temperature of the first filter 21 can be adjusted by adjusting the airflow within the first filter chamber 52. Adjustment can also be made in other ways, as detailed in the embodiments of the first aspect, which will not be repeated here.

[0136] For example, if the temperature of the first filter 21 is low, the airflow through the first filter 21 can be reduced to decrease heat loss and thus increase the actual temperature of the first filter 21. This reduction in airflow can be achieved by decreasing the opening of the first damper 57 or reducing the speed of the circulating fan 41.

[0137] If the temperature of the first filter 21 is too high, the airflow through the first filter 21 can be increased to increase heat loss and thus lower the actual temperature of the first filter 21. This can be achieved by increasing the opening of the first damper 57 or increasing the speed of the circulating fan 41.

[0138] After the above two adjustment methods, after a second preset time, it is re-determined whether the actual temperature of the first filter 21 meets the requirements, that is, the second judgment step is repeated until the cumulative value of the second preset time that meets the requirements is greater than or equal to the first preset time.

[0139] In addition, such as Figure 7 As shown, the second purification step includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode.

[0140] If the indoor heat exchanger is in evaporative heat absorption mode, adjust the second switching valve to direct the refrigerant in the compressor to the second heat exchanger.

[0141] If the indoor heat exchanger is not in evaporative heat absorption mode, the control will start the second electric heating element.

[0142] After the second heater heats the second filter for a second preset time, it is determined whether the temperature of the second filter is within the fluctuation range of the purification temperature.

[0143] If the temperature of the second filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0144] If the temperature of the second filter is lower than the fluctuation range of the purification temperature, control and reduce the airflow through the second filter.

[0145] If the temperature of the second filter is higher than the fluctuation range of the purification temperature, control the increase of the airflow through the second filter.

[0146] The control module 61 can monitor the operating status of the HVAC air purification system 100. When the HVAC air purification system 100 is in cooling mode, the refrigerant condenses and releases heat as it flows through the outdoor heat exchanger 12. By adjusting the second switching valve 322, the refrigerant flowing from the compressor 13 flows directly to the second heat exchanger 321 to heat the air upstream of the second filter 31. The heated air then flows through and heats the second filter 31. The second heat exchanger 321 can also heat the second filter 31 through contact heat exchange and thermal radiation, keeping the second filter 31 stably within the corresponding purification temperature range. This effectively kills bacteria, viruses, and other microorganisms accumulated on its surface at high temperatures, resulting in high heating efficiency and energy efficiency ratio.

[0147] If the HVAC air purification system 100 is not in cooling mode, meaning the refrigerant evaporates and absorbs heat as it flows through the outdoor heat exchanger 12, the second electric heating element 323 can be directly activated to heat the second filter 31, maintaining it stably within the corresponding purification temperature range. This effectively kills bacteria, viruses, and other microorganisms accumulated on its surface at high temperatures, resulting in high heating efficiency and energy efficiency ratio. This expands the adaptable operating range of the high-temperature purification mode.

[0148] By continuously monitoring for a second preset duration, if the actual temperature at the second filter 31 meets the corresponding purification temperature range, the current operating condition can be maintained until the next second preset duration, at which point it will be determined whether the actual temperature of the second filter 31 meets the requirements. The high-temperature purification mode (i.e., high-temperature purification mode) ends when the sum of multiple second preset durations that meet the requirements is greater than or equal to the first preset duration.

[0149] When the purification temperature fluctuates within the low setting, it is 55-75℃. Actual temperatures within this range are considered to meet the requirements, meaning no adjustment of the operating conditions is necessary.

[0150] Furthermore, if, after the second preset time, the actual temperature of the second filter 31 is greater than or less than the corresponding purification temperature range, the actual temperature of the second filter 31 can be adjusted by adjusting the airflow within the second filter chamber 53. Adjustment can also be made in other ways, as detailed in the embodiments of the first aspect, which will not be repeated here.

[0151] For example, if the temperature of the second filter 31 is low, the airflow through the second filter 31 can be reduced to decrease heat loss from the second filter 31, thereby increasing the actual temperature of the second filter 31. This reduction in airflow can be achieved by decreasing the opening of the second damper 58 or reducing the speed of the circulating fan 41.

[0152] If the temperature of the second filter 31 is high, the airflow through the second filter 31 can be increased to increase heat loss and thus lower the actual temperature of the second filter 31. This can be achieved by increasing the opening of the second damper 58 or increasing the speed of the circulating fan 41.

[0153] After the above two adjustment methods, after a second preset time, it is re-evaluated whether the actual temperature of the second filter 31 meets the requirements. That is, the third judgment step is repeated until the cumulative value of the second preset time that meets the requirements is greater than or equal to the first preset time. At this point, the high-temperature purification mode ends.

[0154] In some embodiments, in heating or cooling operation, the operating status of the HVAC air purification system 100 can be controlled by the relationship between the return air temperature T0 and the set temperature T1.

[0155] Taking the cooling mode as an example, the return air temperature T0 can be detected by the third temperature sensor 64. The set range of temperature T1 is set by the return air temperature T0 and the second fluctuation parameter. Taking the range of the second fluctuation parameter as 0.1-2 as an example, the preset value of the second fluctuation parameter can be set to 0.5. That is, the set range of temperature T1 is between T1-0.5 and T1+0.5.

[0156] If the return air temperature T0 within the third preset time period is between T1-0.5 and T1+0.5, the setting requirements are met, and the current cooling operation mode remains unchanged.

[0157] If the return air temperature T0 within the third preset time period is less than T1-0.5, that is, the return air temperature is too low, reduce the operating power of the compressor 13 or reduce the opening of the throttle 14 to reduce the refrigerant flow in the indoor heat exchanger 11, thereby reducing the cooling amount of the circulating air and increasing the return air temperature.

[0158] If the return air temperature T0 within the third preset time period is greater than T1+0.5, that is, the return air temperature is too high, the operating power of the compressor 13 is increased or the opening of the throttle 14 is increased to increase the refrigerant flow in the indoor heat exchanger 11, thereby increasing the cooling of the circulating air and reducing the return air temperature.

[0159] Subsequently, after the third preset time, the range between the return air temperature T0 and the set temperature T1 is repeatedly compared to determine whether the return air temperature T0 meets the preset requirements, until the cooling mode ends.

[0160] The third preset duration can be 30s-2min to allow the indoor unit sufficient time for temperature regulation. For example, the third preset duration can be 30s, 40s, 50s, 60s, 70s, 80s, 90s, 100s, 110s or 120s, and there is no limitation on this.

[0161] If the filter is heated and purified by a heat exchanger, the real-time temperature of the filter can also be adjusted in other ways, such as adjusting the refrigerant flow rate in the first heat exchanger 221 and the second heat exchanger 321.

[0162] In some embodiments, such as Figure 8 As shown, when the first filter is heated by the first heat exchanger, the first purification step further includes: After the first heat exchanger heats the first filter for a second preset time, it is determined whether the temperature of the first filter is within the fluctuation range of the purification temperature.

[0163] If the temperature of the first filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0164] If the temperature of the first filter is lower than the fluctuation range of the purification temperature, the flow rate of the refrigerant flowing through the first heat exchanger will be increased.

[0165] If the temperature of the first filter is higher than the fluctuation range of the purification temperature, the flow rate of refrigerant flowing through the first heat exchanger should be reduced.

[0166] The flow rate of refrigerant flowing through the first heat exchanger 221 can be adjusted by setting the first switching valve 222 as an opening valve. For example, the control module 61 can control the drive structure (drive motor or drive coil) of the first switching valve 222 to flexibly adjust its opening. When the opening of the first switching valve 222 increases, the amount of refrigerant flowing through the first heat exchanger 221 increases, causing more refrigerant to liquefy and release heat within the first heat exchanger 221, further heating the first filter 21 with higher-temperature air.

[0167] When the opening of the first switching valve 222 decreases, the amount of refrigerant flowing through the first heat exchanger 221 decreases, so that less refrigerant liquefies in the first heat exchanger 221 and releases heat, so that the first filter 21 is kept heated by air at a lower temperature, and its temperature is gradually reduced to the fluctuation range of the purification temperature.

[0168] Based on this, the first switching valve 222 and the second switching valve 322 can be configured as two separate opening valves, connected in series with the corresponding first heat exchanger 221 and second heat exchanger 321 to form two parallel refrigerant branches. A third switching valve is connected in series at the inlet or outlet of the outdoor heat exchanger 12 and connected in parallel with the above two refrigerant branches. By adjusting the opening of the third switching valve, the refrigerant flow rate in the first heat exchanger 221 (or the second heat exchanger 321) can also be adjusted. Increasing the opening of the third switching valve will decrease the refrigerant flow rate at the first heat exchanger 221 (or the second heat exchanger 321), while decreasing the opening of the third switching valve will increase the refrigerant flow rate at the first heat exchanger 221 (or the second heat exchanger 321).

[0169] In addition, the operating power of compressor 13 can be increased or decreased to control and regulate the amount of refrigerant flowing out of compressor 13, which can also change the refrigerant flow rate at the first heat exchanger 221, without limitation.

[0170] Correspondingly, such as Figure 8 As shown, the second purification step also includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode.

[0171] If the indoor heat exchanger is in evaporative heat absorption mode, adjust the second switching valve to direct the refrigerant in the compressor to the second heat exchanger.

[0172] After the second heat exchanger heats the second filter for a second preset time, it is determined whether the temperature of the second filter is within the fluctuation range of the purification temperature.

[0173] If the temperature of the second filter is within the fluctuation range of the purification temperature, maintain the current operating status.

[0174] If the temperature of the second filter is lower than the fluctuation range of the purification temperature, control the increase of the refrigerant flow through the second heat exchanger.

[0175] If the temperature of the second filter is higher than the fluctuation range of the purification temperature, control the reduction of the refrigerant flow through the second heat exchanger.

[0176] By adjusting the refrigerant flow rate through the second heat exchanger 321, the second switching valve 322 can be configured as an opening valve. For example, the drive structure (drive motor or drive coil) of the second switching valve 322 can be controlled by the control module 61 to flexibly adjust the opening degree of the second switching valve 322. When the opening degree of the second switching valve 322 increases, the amount of refrigerant flowing through the second heat exchanger 321 increases, causing more refrigerant to liquefy and release heat within the second heat exchanger 321, further heating the second filter 31 with higher-temperature air.

[0177] When the opening of the second switching valve 322 decreases, the amount of refrigerant flowing through the second heat exchanger 321 decreases, so that less refrigerant liquefies in the second heat exchanger 321 and releases heat, so as to keep the second filter 31 heated by air at a lower temperature and gradually reduce its temperature to the fluctuation range of the purification temperature.

[0178] In addition, the operating power of compressor 13 can be increased or decreased to control and regulate the amount of refrigerant flowing out of compressor 13, which can also change the refrigerant flow rate at the second heat exchanger 321, without limitation.

[0179] The heating temperature of the first filter 21 or the second filter 31 is adjusted by regulating the refrigerant flow rate. In this process, the airflow of the HVAC air purification system 100 does not need to be changed, so as to keep the air circulation of the whole unit stable.

[0180] Fourthly, such as Figure 9 As shown in the figure, this application embodiment provides a control device for a heating, ventilation, and air purification system, namely a control module 61. The control module includes a processor 611, a communication interface 612, a memory 613, and a communication bus 614. The processor 611, communication interface 612, and memory 613 communicate with each other via the communication bus 614. The memory 613 is used to store computer programs.

[0181] In one embodiment of this application, when the processor 611 executes the computer program stored in the memory 613, it implements the execution steps of the control method for the HVAC air purification system in the third aspect.

[0182] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the execution steps of the control method for the HVAC air purification system as described in the third aspect.

[0183] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0184] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general-purpose hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM (Read-Only Memory) / RAM (Random Access Memory), magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0185] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0186] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heating, ventilation, and air purification system, characterized in that, It includes an indoor heat exchanger, a first filter, a second filter, a first heater, a second heater, and a circulating fan; the circulating fan is used to drive airflow through the indoor heat exchanger, the first filter, and the second filter, wherein the first filter and the second filter are high-efficiency air filters; Along the direction of air flow, the first filter and the first heater are disposed on one side of the indoor heat exchanger, with the first filter located downstream of the first heater; Along the direction of air flow, the second filter and the second heater are disposed on one side of the indoor heat exchanger. The second filter and the first filter are located on the same side of the indoor heat exchanger and are separated from each other. The second filter is located downstream of the second heater.

2. The HVAC air purification system according to claim 1, characterized in that, The HVAC air purification system includes an outdoor heat exchanger, a compressor, and a throttle valve. The indoor heat exchanger, the compressor, the outdoor heat exchanger, and the throttle valve are connected to form a refrigerant circulation loop. The first heater includes a first heat exchanger and a first switching valve. The first heat exchanger and the first switching valve are connected in series and then in parallel to the two ends of the outdoor heat exchanger. The first switching valve is used to control the flow of refrigerant through the first heat exchanger or the outdoor heat exchanger. The second heater includes a second heat exchanger and a second switching valve. The second heat exchanger and the second switching valve are connected in series and then in parallel to the two ends of the outdoor heat exchanger. The second switching valve is used to control the flow of refrigerant through the second heat exchanger or the outdoor heat exchanger.

3. The HVAC air purification system according to claim 2, characterized in that, The first heater includes a first electric heating element, which is located upstream of the first filter along the airflow direction and is used to heat the first filter; The second heater includes a second electric heating element located upstream of the second filter along the airflow direction for heating the second filter.

4. The HVAC air purification system according to claim 3, characterized in that, The HVAC air purification system also includes a control module, a first temperature sensor, and a second temperature sensor. The first temperature sensor is located at the first filter, and the second temperature sensor is located at the second filter. The control module is electrically connected to the first temperature sensor, the second temperature sensor, the first switching valve, the second switching valve, the first electric heating element, and the second electric heating element.

5. The HVAC air purification system according to claim 2, characterized in that, The HVAC air purification system also includes a four-way valve, which has four ports for switching between heating and cooling modes of the refrigerant circulation loop. The compressor's inlet and outlet are connected in sequence to the first and second ports of the four-way valve; One end of the indoor heat exchanger is connected in sequence to the throttle valve and one end of the outdoor heat exchanger. The other end of the indoor heat exchanger is connected to the third port of the four-way valve, and the other end of the outdoor heat exchanger is connected to the fourth port of the four-way valve.

6. The HVAC air purification system according to any one of claims 1-5, characterized in that, The HVAC air purification system includes a housing, and the housing is provided with a heat exchange chamber, a first filter chamber, and a second filter chamber. The indoor heat exchanger is disposed in the heat exchange chamber, the first filter and the first heater are disposed in the first filter chamber, and the second filter and the second heater are disposed in the second filter chamber; Along the direction of air flow, the first filter chamber and the second filter chamber are connected upstream of the heat exchange chamber, and the first filter chamber and the second filter chamber are isolated from each other.

7. The HVAC air purification system according to claim 6, characterized in that, The casing is provided with a first return air inlet, a second return air inlet, and an air outlet; Along the airflow direction, the air outlet is connected to the side of the heat exchange chamber away from the first filter chamber, the first return air outlet is connected to the side of the first filter chamber away from the heat exchange chamber, and the second return air outlet is connected to the side of the second filter chamber away from the heat exchange chamber. The HVAC air purification system includes at least two third filters, which are installed at the first return air inlet and the second return air inlet.

8. The HVAC air purification system according to claim 7, characterized in that, The housing includes: The first air damper is located at the first return air inlet; The second air damper is located at the second return air inlet; The system also includes a control module electrically connected to the first and second air dampers, used to independently adjust the opening of the first and second return air inlets.

9. The HVAC air purification system according to any one of claims 1-5, characterized in that, The first filter and the second filter are configured as detachable structures.

10. An air conditioner, characterized in that, Includes the HVAC air purification system as described in any one of claims 1-9.

11. A control method for a heating, ventilation, and air purification system, applied to the heating, ventilation, and air purification system as described in any one of claims 1-9, characterized in that, The control method includes: Control the HVAC air purification system to operate in high-temperature purification mode; Determine whether the first filter needs self-cleaning; If the first filter needs to be self-cleaned, control the first heater to start so that the first filter is heated to the purification temperature and the first filter is kept at the purification temperature for at least a first preset time. If the first filter does not require self-cleaning, the second heater is activated to heat the second filter to the purification temperature, and the second filter maintains the purification temperature for at least a second preset time.

12. The control method for the HVAC air purification system according to claim 11, characterized in that, The step of controlling the activation of the first heater to heat the first filter to the purification temperature includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode; If the indoor heat exchanger is in evaporative heat absorption mode, adjust the first switching valve to direct the refrigerant in the compressor to the first heat exchanger. If the indoor heat exchanger is not in evaporative heat absorption mode, the first electric heating element is activated.

13. The control method for the HVAC air purification system according to claim 12, characterized in that, After adjusting the first switching valve or activating the first electric heating element, controlling the activation of the first heater to heat the first filter to the purification temperature further includes: After the first heater heats the first filter for a second preset time, it is determined whether the temperature of the first filter is within the fluctuation range of the purification temperature. If the temperature of the first filter is within the fluctuation range of the purification temperature, maintain the current operating state; If the temperature of the first filter is lower than the fluctuation range of the purification temperature, the airflow through the first filter is reduced. If the temperature of the first filter is higher than the fluctuation range of the purification temperature, the airflow through the first filter is increased.

14. The control method for the HVAC air purification system according to claim 12, characterized in that, When the first filter is heated via the first heat exchanger, the step of controlling the activation of the first heater to heat the first filter to the purification temperature further includes: After the first heat exchanger heats the first filter for a second preset time, it is determined whether the temperature of the first filter is within the fluctuation range of the purification temperature. If the temperature of the first filter is within the fluctuation range of the purification temperature, maintain the current operating state; If the temperature of the first filter is lower than the fluctuation range of the purification temperature, the flow rate of the refrigerant flowing through the first heat exchanger is increased. If the temperature of the first filter is higher than the fluctuation range of the purification temperature, the flow rate of refrigerant flowing through the first heat exchanger is reduced.

15. The control method for the HVAC air purification system according to any one of claims 11-14, characterized in that, The step of controlling the activation of the second heater to heat the second filter to the purification temperature includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode; If the indoor heat exchanger is in evaporative heat absorption mode, adjust the second switching valve to direct the refrigerant in the compressor to the second heat exchanger. If the indoor heat exchanger is not in evaporative heat absorption mode, control the activation of the second electric heating element; After the second heater heats the second filter for a second preset time, it is determined whether the temperature of the second filter is within the fluctuation range of the purification temperature. If the temperature of the second filter is within the fluctuation range of the purification temperature, maintain the current operating status; If the temperature of the second filter is lower than the fluctuation range of the purification temperature, the airflow through the second filter is reduced. If the temperature of the second filter is higher than the fluctuation range of the purification temperature, the airflow through the second filter is increased.

16. The control method for the HVAC air purification system according to any one of claims 11-14, characterized in that, The step of controlling the activation of the second heater to heat the second filter to the purification temperature includes: Determine whether the indoor heat exchanger of the HVAC air purification system is in evaporative heat absorption mode; If the indoor heat exchanger is in evaporative heat absorption mode, adjust the second switching valve to direct the refrigerant in the compressor to the second heat exchanger. After the second heat exchanger heats the second filter for a second preset time, it is determined whether the temperature of the second filter is within the fluctuation range of the purification temperature. If the temperature of the second filter is within the fluctuation range of the purification temperature, maintain the current operating status; If the temperature of the second filter is lower than the fluctuation range of the purification temperature, the flow rate of the refrigerant flowing through the second heat exchanger is increased. If the temperature of the second filter is higher than the fluctuation range of the purification temperature, the flow rate of refrigerant flowing through the second heat exchanger is reduced.

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