Control method of an environmental conditioning device, environmental conditioning device, and storage medium

Abstract

The application discloses a control method of an environment adjusting device, the environment adjusting device and a storage medium. The environment adjusting device comprises a first heat pump system and a second heat pump system, the first heat pump system comprises a first compressor, the second heat pump system comprises a second compressor, and the distance between the installation position of the first compressor and the installation position of the second compressor is less than a preset distance. The method comprises the following steps: acquiring a first frequency of the first compressor and a second frequency of the second compressor; and when the first frequency and the second frequency reach a beat frequency condition, controlling the first compressor and the second compressor to adjust the frequency operation. The application aims to reduce the risk of beat frequency phenomenon of the environment adjusting device provided with more than one heat pump system, reduce the operation noise of the environment adjusting device, and improve the user experience of the environment adjusting device.

Description

Technical Field

[0001] This invention relates to the field of environmental equipment technology, and more particularly to control methods, environmental conditioning equipment, and storage media for environmental conditioning equipment. Background Technology

[0002] Environmental control equipment (such as air conditioners and dehumidifiers) typically incorporates heat pump systems. These systems regulate the temperature and humidity of the air within the duct through refrigerant circulation before delivering it into the indoor environment. Some environmental control devices may contain more than one heat pump system. The compressor frequencies of these systems are usually independently controlled. When the compressors in different heat pump systems are located close together, frequency synchronization issues can occur, resulting in significant operating noise and negatively impacting the user experience of the environmental control equipment. Summary of the Invention

[0003] The main objective of this invention is to provide a control method, an environmental conditioning device, and a storage medium for environmental conditioning equipment, aiming to reduce the risk of frequency beats in environmental conditioning equipment with more than one heat pump system, reduce the operating noise of environmental conditioning equipment, and improve the user experience of environmental conditioning equipment.

[0004] To achieve the above objectives, the present invention provides a control method for an environmental conditioning device, the environmental conditioning device comprising a first heat pump system and a second heat pump system, the first heat pump system comprising a first compressor, the second heat pump system comprising a second compressor, the distance between the installation positions of the first compressor and the second compressor being less than a preset distance, and the control method for the environmental conditioning device comprising the following steps:

[0005] Obtain the first frequency of the first compressor and the second frequency of the second compressor;

[0006] When the first frequency and the second frequency reach the beat frequency condition, the first compressor and the second compressor are controlled to adjust their frequencies for operation.

[0007] Optionally, the step of controlling the first compressor and the second compressor to adjust their operating frequency includes:

[0008] Control the first compressor to operate at a higher frequency and control the second compressor to operate at a lower frequency, or control the first compressor to operate at a lower frequency and control the second compressor to operate at a higher frequency.

[0009] Optionally, after the step of obtaining the first frequency of the first compressor and the second frequency of the second compressor, the method further includes:

[0010] When the first frequency and the second frequency reach the beat frequency condition, the ambient temperature of the target environment is obtained;

[0011] When the ambient temperature is lower than the preset frosting temperature, the first heat exchange area of ​​the first heat exchanger and the second heat exchange area of ​​the second heat exchanger are obtained. The first heat exchanger is the heat exchanger in the first heat pump system that is located in the target environment and is in an evaporation state. The second heat exchanger is the heat exchanger in the second heat pump system that is located in the target environment and is in an evaporation state.

[0012] When the first heat exchange area is smaller than the second heat exchange area, the steps of controlling the first compressor to operate at a higher frequency and controlling the second compressor to operate at a lower frequency are executed.

[0013] When the first heat exchange area is greater than or equal to the second heat exchange area, the steps of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency are executed.

[0014] Optionally, after the step of obtaining the first frequency of the first compressor and the second frequency of the second compressor, the method further includes:

[0015] When the first frequency and the second frequency reach the beat frequency condition, the first maximum frequency currently allowed to operate of the first heat pump system and the second maximum frequency currently allowed to operate of the second heat pump system are obtained.

[0016] When the first maximum frequency is greater than the second maximum frequency, the steps of controlling the first compressor to operate at an increased frequency and controlling the second compressor to operate at a decreased frequency are executed.

[0017] When the first maximum frequency is less than or equal to the second maximum frequency, the steps of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency are executed.

[0018] Optionally, after the step of obtaining the first frequency of the first compressor and the second frequency of the second compressor, the method further includes:

[0019] When the first frequency and the second frequency reach the beat frequency condition, the first maximum frequency currently allowed to operate of the first heat pump system and the second maximum frequency currently allowed to operate of the second heat pump system are obtained.

[0020] Determine a first difference between the first maximum frequency and the first frequency, and determine a second difference between the second maximum frequency and the second frequency;

[0021] When the first difference is greater than the second difference, the steps of controlling the first compressor to operate at a higher frequency and controlling the second compressor to operate at a lower frequency are executed.

[0022] When the first difference is less than or equal to the second difference, the steps of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency are executed.

[0023] Optionally, the step of controlling the adjustment frequency of at least one of the first compressor and the second compressor includes:

[0024] The first compressor is controlled to operate at an increased frequency according to a first frequency adjustment value, and the second compressor is controlled to operate at an increased frequency according to a second frequency adjustment value; or, the first compressor is controlled to operate at a decreased frequency according to a first frequency adjustment value, and the second compressor is controlled to operate at a decreased frequency according to a second frequency adjustment value.

[0025] The first frequency adjustment value and the second frequency adjustment value are different adjustment values.

[0026] Optionally, the beat frequency condition includes at least one of the following conditions:

[0027] The frequency difference between the first frequency and the second frequency is less than a first preset threshold.

[0028] The frequency difference between the first frequency (a multiple of the first frequency) and the second frequency (a multiple of the second frequency) is less than a second preset threshold.

[0029] Optionally, after the step of controlling the first compressor and the second compressor to adjust their operating frequencies, the method further includes:

[0030] The first compressor and the second compressor are identified as target compressors.

[0031] When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after increasing the frequency is within the resonant frequency range, the target compressor is controlled to increase its frequency to the upper limit frequency for operation. The frequencies within the resonant frequency range are all lower than the upper limit frequency.

[0032] When the target compressor adjusts its frequency in the direction of frequency reduction and the operating frequency after frequency reduction is within the resonant frequency range, the target compressor is controlled to reduce its frequency to the lower limit frequency, and all frequencies within the resonant frequency range are greater than the lower limit frequency.

[0033] Optionally, after determining that the first compressor and the second compressor are target compressors, the method further includes:

[0034] When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after the frequency increase is within the resonant frequency range, and the upper limit frequency is less than or equal to the third maximum frequency that the target compressor is allowed to operate at, the step of controlling the target compressor to increase its frequency to the upper limit frequency is executed;

[0035] When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after the frequency increase is within the resonant frequency range, and the upper limit frequency is greater than the third maximum frequency allowed for the target compressor to operate, the target compressor is controlled to operate at a reference frequency. Based on the reference frequency and a preset frequency adjustment value, the corresponding frequency adjustment parameters are determined to control the other compressor (other than the target compressor) among the first compressor and the second compressor to operate at a lower frequency. The reference frequency includes the lower limit frequency or the operating frequency of the target compressor before the frequency increase.

[0036] Furthermore, in order to achieve the above objectives, this application also proposes an environmental control device, which includes:

[0037] A first heat pump system, the first heat pump system including a first compressor;

[0038] A second heat pump system, the second heat pump system including a second compressor, wherein the distance between the installation position of the first compressor and the installation position of the second compressor is less than a preset distance;

[0039] A control device, comprising: a memory, a processor, and a control program for an environmental control device stored in the memory and executable on the processor, wherein the control program for the environmental control device, when executed by the processor, implements the steps of the control method for the environmental control device as described in any of the preceding claims.

[0040] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for an environmental control device, wherein the control program for the environmental control device, when executed by a processor, implements the steps of the control method for the environmental control device as described in any of the preceding claims.

[0041] This invention proposes a control method for an environmental control device, which includes a first heat pump system and a second heat pump system, with the compressors in the two heat pump systems installed close to each other. When the frequencies of the first compressor in the first heat pump system and the second compressor in the second heat pump system reach a frequency beat condition, the method controls the first and second compressors to adjust their frequencies. The compressor frequencies in the two heat pump systems are no longer independently controlled, which facilitates coordinated operation between the compressor frequencies of the first and second heat pump systems, avoiding frequency ranges prone to frequency beats. This effectively reduces the risk of frequency beats in environmental control devices with more than one heat pump system, lowers the operating noise of the environmental control device, and improves the user experience of the environmental control device. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of an embodiment of the environmental control device of the present invention;

[0043] Figure 2 This is a schematic diagram of another embodiment of the environmental control device of the present invention;

[0044] Figure 3 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the environmental control device of the present invention;

[0045] Figure 4 This is a flowchart illustrating an embodiment of the control method for the environmental conditioning equipment of the present invention;

[0046] Figure 5 This is a schematic flowchart of another embodiment of the control method for the environmental conditioning equipment of the present invention;

[0047] Figure 6 This is a flowchart illustrating another embodiment of the control method for the environmental conditioning equipment of the present invention;

[0048] Figure 7 This is a flowchart illustrating another embodiment of the control method for the environmental conditioning equipment of the present invention;

[0049] Figure 8 This is a flowchart illustrating another embodiment of the control method for the environmental conditioning equipment of the present invention.

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0052] This invention provides an environmental control device for regulating indoor environmental conditions. In this embodiment, the environmental control device is a fresh air system. In other embodiments, the environmental control device may be other types of devices used to regulate indoor environments, such as dehumidifiers, air conditioners, etc.

[0053] In this embodiment of the invention, reference is made to Figures 1 to 3 The environmental control equipment includes a control device 1, a first heat pump system 2, and a second heat pump system 3. Both the first heat pump system 2 and the second heat pump system 3 are connected to the control device 1, which controls the operation of components in both systems. The first heat pump system 2 includes a first compressor 21, and the second heat pump system 3 includes a second compressor 31. The distance between the installation positions of the first compressor 21 and the second compressor 31 is less than a preset distance, which is the maximum distance at which the first compressor 21 and the second compressor 31 will emit abnormal noise during operation. In this embodiment, the first compressor 21 and the second compressor 31 are installed in the same outdoor unit. It should be noted that... Figure 1 The middle arrow indicates the airflow direction within the corresponding duct.

[0054] In this embodiment, both the first compressor 21 and the second compressor 31 are located in the outdoor unit and are arranged adjacent to each other. In other embodiments, the first compressor 21 and the second compressor 31 may also be located in the indoor unit and are arranged adjacent to each other.

[0055] The first heat pump system 2 includes a first compressor 21, a first heat exchange module 22, and a first throttling device 323 connected by refrigerant piping. The number of first heat exchange modules 22 is at least two, and a throttling device 323 is provided between adjacent first heat exchange modules 22. At least one of the at least two first heat exchange modules 22 is located in an indoor air supply duct 01 for heat exchange of air flowing through the air supply duct 01. In addition to the heat exchange modules located within the air supply duct 01, the at least two first heat exchange modules 22 may also include heat exchange modules located outside the air supply duct 01 (e.g., heat exchangers in indoor exhaust duct 02 and / or heat exchangers located in the outdoor environment). Specifically, in the embodiment, at least two first heat exchange modules 22 are defined as a first sub-heat exchanger 221, a second sub-heat exchanger 222, and a third sub-heat exchanger 223, respectively. A throttling device 3 is provided between two adjacent sub-heat exchangers. The first sub-heat exchanger 221 and the second sub-heat exchanger 222 are located in the air supply duct 01, and the third sub-heat exchanger 223 is located in the air exhaust duct 02. During the operation of the first heat pump system 2, the heat exchange states of the first sub-heat exchanger 221 and the second sub-heat exchanger 222 can be the same or different. For example, they can both be in an evaporation state to cool and / or dehumidify the flowing air, or they can both be in a condensation state to heat the flowing air, or they can be in a condensation state and an evaporation state respectively to reheat and dehumidify the flowing air.

[0056] The second heat pump system 3 includes a second compressor 31, a second heat exchange module 32, and a second throttling device 333, all connected via refrigerant piping. The number of second heat exchange modules 32 is at least two, and a throttling device 3 is provided between adjacent second heat exchange modules 32. At least one of the at least two second heat exchange modules 32 is located in the indoor air supply duct 01 for heat exchange of the air flowing through the air supply duct 01. In addition to the heat exchange modules located within the air supply duct 01, the at least two second heat exchange modules 32 may also include heat exchange modules located outside the air supply duct 01 (e.g., heat exchangers in indoor exhaust duct 02 and / or heat exchangers located in the outdoor environment). Specifically, in the embodiment, at least two second heat exchange modules 32 are defined as a fourth sub-heat exchanger 321, a fifth sub-heat exchanger 322, and a sixth sub-heat exchanger 323, respectively. A throttling device 3 is provided between adjacent sub-heat exchangers. The fourth sub-heat exchanger 321 and the fifth sub-heat exchanger 322 are located in the air supply duct 01, and the sixth sub-heat exchanger 323 is located in the outdoor environment. During the operation of the second heat pump system 3, the heat exchange states of the fourth sub-heat exchanger 321 and the fifth sub-heat exchanger 322 can be the same or different. For example, they can both be in an evaporation state to cool and / or dehumidify the flowing air, or they can both be in a condensation state to heat the flowing air, or they can be in a condensation state and an evaporation state respectively to reheat and dehumidify the flowing air.

[0057] The air inlet of the supply air duct 01 can be connected to the indoor and / or outdoor environment to deliver air from the indoor and / or outdoor environment into the room after being regulated by a heat exchanger inside the duct. The exhaust air duct 02 connects the indoor and outdoor environments, and air from the indoor environment is delivered to the outside through the exhaust air duct 02.

[0058] In this embodiment, both the first heat pump system 2 and the second heat pump system 3 are equipped with a four-way valve and other flow direction switching module 5 to switch the refrigerant flow direction in the corresponding heat pump system, so that the heat exchange state of the heat exchange module in the air supply duct 01 can be switched between evaporation state and condensation state.

[0059] Furthermore, in this embodiment, the first heat exchange module 22 and the second heat exchange module 32, located within the air supply duct 01, are arranged sequentially along the airflow direction. Specifically, the first region, the second region, and the third region are arranged sequentially along the airflow direction of the air supply duct 01, with the first sub-heat exchanger 221 located in the first region, the fourth sub-heat exchanger 321 located in the second region, and the second sub-heat exchanger 222 and the fifth sub-heat exchanger 322 arranged side-by-side in the third region. In other embodiments, each heat pump system may also have one heat exchanger installed within the air supply duct 01, such as the first sub-heat exchanger 221 of the first heat pump system 2 and the third sub-heat exchanger 321 of the second heat pump system 3.

[0060] Furthermore, in this embodiment, referring to Figure 1More than one one-way shut-off valve 4 may be provided between the fourth sub-heat exchanger 321 and the fifth sub-heat exchanger 322 (wherein) Figure 1 The middle arrow indicates the refrigerant flow direction allowed by the one-way shut-off valve 4, which regulates the flow direction of refrigerant into the fourth sub-heat exchanger 321 and the third sub-heat exchanger 223. Under the regulation of more than one one-way shut-off valve 4, regardless of how the valve position of the four-way valve changes, the refrigerant flows into the fourth sub-heat exchanger 321 and the third sub-heat exchanger 223 with a fixed inlet and flows out of the fourth sub-heat exchanger 321 and the third sub-heat exchanger 223 with a fixed outlet, so as to achieve the same refrigerant flow direction in the fourth sub-heat exchanger 321 and the third sub-heat exchanger 223 as the airflow direction in the air supply duct 01, thereby improving the heat exchange efficiency.

[0061] Furthermore, in this embodiment, referring to Figure 1 The throttling device 3 between the second sub-heat exchanger 222 and the first sub-heat exchanger 221 is connected in series with the second sub-heat exchanger 222 and can be connected to the one-way shut-off valve 4 (wherein... Figure 1 The middle arrow indicates the refrigerant flow direction allowed by the one-way shut-off valve 4, which regulates the flow direction of the refrigerant into the second sub-heat exchanger 222. Under the regulation of the one-way shut-off valve 4, regardless of how the valve position of the four-way valve changes, the refrigerant flows into the second sub-heat exchanger 222 with a fixed inlet and flows out of the second sub-heat exchanger 222 with a fixed outlet, so as to realize that the refrigerant flow direction in the second sub-heat exchanger 222 is the same as the airflow direction in the air supply duct 01, thereby improving the heat exchange efficiency.

[0062] Furthermore, in one embodiment, referring to Figure 2The environmental control equipment includes a housing and a second heat pump system 3. The housing contains an air supply duct 01. The second heat pump system 3 includes a heat exchanger structure and a first switching device. The heat exchanger structure is located within the air supply duct 01 and has a refrigerant pipeline. The first switching device is connected to the heat exchanger structure and is used to switch the flow direction of the refrigerant within the heat exchanger structure. In different operating modes, the refrigerant of the second heat pump system 3 first passes through the refrigerant pipeline downstream of the air supply duct 01 and then through the refrigerant pipeline upstream of the air supply duct 01. The air supply duct 01 refers to the channel through which the environmental control equipment delivers fresh outdoor air into the room, and the exhaust duct 02 refers to the channel through which the environmental control equipment exhausts indoor air to the outside. The heat exchanger structure is located in the first refrigerant flow path. The second heat pump system 3 further includes: a second compressor 31, a first heat exchange module, and a four-way valve 5. The second compressor 31 is located in the first refrigerant flow path and has a first exhaust port and a first return port. The first heat exchange module is located in the first refrigerant flow path and is connected to the first switching device. The first heat exchange module includes a seventh sub-heat exchanger 324 and a sixth sub-heat exchanger 323 arranged in series. The sixth sub-heat exchanger 323 is located in the exhaust duct 02, and the seventh sub-heat exchanger 324 is located outside the housing (main unit housing). The second compressor 31 is installed in the exhaust duct 02 or... Installed outside the housing (main unit housing), the sixth sub-heat exchanger 323 is located inside the exhaust duct 02. After the air in the exhaust duct 02 exchanges heat with the sixth sub-heat exchanger 323, it is discharged from the exhaust duct 02, thereby enabling heat recovery of the air discharged from the exhaust duct 02. The four-way valve 5 connects the first exhaust port, the first return port, the first heat exchange module, and the first switching device. The four-way valve 5 is used to switch the refrigerant flow direction so that the refrigerant passes through the first heat exchange module first and then through the first switching device, or so that the refrigerant passes through the first switching device first and then through the first heat exchange module. To achieve the reheat dehumidification function of the environmental control equipment, the heat exchanger structure includes a fifth sub-heat exchanger 322 and a fourth sub-heat exchanger 321 connected in series. The fifth sub-heat exchanger 322 is located downstream of the air supply duct 01 relative to the fourth sub-heat exchanger 321. In the reheat dehumidification mode, the fifth sub-heat exchanger 322 acts as an evaporator to cool the air, and the fourth sub-heat exchanger 321 acts as a condenser to heat the air, thereby achieving reheat dehumidification of the air.

[0063] To reduce the number of control components in the environmental control equipment and improve its stability, the first switching device has a first connecting port 101, a second connecting port 102, an inlet 103, and an outlet 104. The fresh air heat exchanger structure connects the outlet 104 and the inlet 103. The first switching device includes a first one-way valve 41, a second one-way valve 42, a third one-way valve 43, and a fourth one-way valve 44. The first one-way valve 41 is connected between the first connecting port 101 and the inlet 103, and is open in the direction from the inlet 103 to the first connecting port 101. The second one-way valve 42 is connected between the first connecting port 101 and the outlet 104. Between the inlet 103 and the second connecting port 102, the second one-way valve 42 is open in the direction from the first connecting port 101 to the outlet 104; the third one-way valve 43 is connected between the inlet 103 and the second connecting port 102, and is open in the direction from the inlet 103 to the second connecting port 102; the fourth one-way valve 44 is connected between the outlet 104 and the second connecting port 102, and is open in the direction from the second connecting port 102 to the outlet 104. With this configuration, the first switching device is composed entirely of one-way valves. Compared with the four-way valve or two three-way valves, no control elements are required, and the stability of the environmental control device is higher.

[0064] The fresh air heat exchanger structure includes a fourth sub-heat exchanger 321 and a first sub-heat exchanger 221 connected in series. The fourth sub-heat exchanger 321 is located downstream of the air supply channel 01 relative to the first sub-heat exchanger 221. The outlet 104 is connected to the fourth sub-heat exchanger 321, and the inlet 103 is connected to the first sub-heat exchanger 221. With this configuration, in the reheat dehumidification mode, the fourth sub-heat exchanger 321 acts as an evaporator to cool the air, and the first sub-heat exchanger 221 acts as a condenser to heat the air, thereby achieving reheat dehumidification of the air.

[0065] To achieve the reheat dehumidification function of the environmental control equipment, the fresh air heat exchanger structure includes a fourth sub-heat exchanger 321 and a first sub-heat exchanger 221 connected in series. The fourth sub-heat exchanger 321 is located downstream of the air supply channel 01 relative to the first sub-heat exchanger 221. The outlet 34 is connected to the fourth sub-heat exchanger 321, and the inlet 33 is connected to the first sub-heat exchanger 221. With this configuration, in the reheat dehumidification mode, the fourth sub-heat exchanger 321 acts as an evaporator to cool the air, and the first sub-heat exchanger 221 acts as a condenser to heat the air, thereby achieving reheat dehumidification of the air.

[0066] The second heat pump system 3 also includes a throttling device 3 disposed in the flow path between the first heat exchange module and the first switching device and disposed in series between the fifth sub-heat exchanger 322 and the fourth sub-heat exchanger 321.

[0067] When the environmental control equipment is operating in heating mode, the heat exchanger installed in the air supply duct 01 condenses and releases heat. Specifically, when the environmental control equipment includes the second heat pump system 3, the refrigerant discharged from the second compressor 31 passes sequentially through the four-way valve 5, the fifth sub-heat exchanger 322, the throttling device 3, the fourth sub-heat exchanger 321, the throttling device 3, the sixth sub-heat exchanger 323, the seventh sub-heat exchanger 324, and the four-way valve 5 before returning to the second compressor 31. At this time, the throttling device 3 in the flow path connected in series between the fifth sub-heat exchanger 322 and the fourth sub-heat exchanger 321 is fully open. The throttling device 3 between the first heat exchange module and the first switching device plays a throttling and pressure reduction role. The fifth sub-heat exchanger 322 and the fourth sub-heat exchanger 321 condense and release heat, while the sixth sub-heat exchanger 323 and the seventh sub-heat exchanger 324 evaporate and absorb heat.

[0068] Furthermore, the environmental control equipment also includes a first heat pump system 2, on which a second refrigerant flow path is formed. The first heat pump system 2 includes a third sub-heat exchanger 223, a first compressor 21, a second sub-heat exchanger 222, and a first sub-heat exchanger 221 disposed in the second refrigerant flow path. The second sub-heat exchanger 222 and the first sub-heat exchanger 221 are both disposed in the air supply duct 01. At this time, the third sub-heat exchanger 223 and the first compressor 21 can also be disposed in the exhaust duct 02, thereby making the environmental control equipment completely free of an outdoor unit, saving space.

[0069] The first heat pump system 2 further includes a second switching device for switching the third sub-heat exchanger 223 to be connected to the second sub-heat exchanger 222 or simultaneously connected to the second sub-heat exchanger 222 and the first sub-heat exchanger 221.

[0070] When the environmental control equipment is operating in heating mode, the heat exchanger installed in the air supply duct 01 condenses and releases heat. When the environmental control equipment includes the first heat pump system 2, the refrigerant discharged from the first compressor 21 passes sequentially through the four-way valve 5, the first sub-heat exchanger 221, the throttling device 3, the third sub-heat exchanger 223, and the four-way valve 5 before returning to the first compressor 21. At this time, the throttling device 3 between the first sub-heat exchanger 221 and the second sub-heat exchanger 222 is closed, and the throttling device between the third sub-heat exchanger 223 and the second sub-heat exchanger 222 plays a throttling and pressure reduction role. The second sub-heat exchanger 222 condenses and releases heat, and the third sub-heat exchanger 223 evaporates and absorbs heat. The refrigerant does not pass through the fourth throttling element 24 and the second sub-heat exchanger 222.

[0071] This configuration, with two heat exchange systems and two evaporators within the air supply duct, results in two evaporation temperatures. The upstream evaporator has a higher temperature than the downstream one, enabling two-stage evaporative cooling. Compared to a single-stage evaporative cooling system, this significantly improves energy efficiency. Furthermore, the upstream heat exchange system can preheat or precool the air before it passes through the downstream system. This effectively lowers the outlet air temperature in cooling mode and raises it in heating mode. Alternatively, the upstream system can cool the air, while the downstream system can heat it, achieving reheat dehumidification.

[0072] Because the second heat pump system 3 and the first heat pump system 2 coexist, it is often necessary to install two outdoor units for each system. This requires two separate outdoor unit locations, consuming too much space and significantly increasing the workload of installation. Therefore, the housing includes a main unit housing and an outdoor unit housing. The main unit housing contains the supply air duct 01 and the exhaust air duct 02. The second heat pump system 3 also includes a second compressor 31 and a first heat exchange module. The first heat exchange module includes a seventh sub-heat exchanger 324 and a sixth sub-heat exchanger 323 connected in series. The sixth sub-heat exchanger 323 is located within the exhaust air duct 02, and the first sub-heat exchanger 221 is located within the supply air duct 01. The second compressor 31… The seventh sub-heat exchanger 324, the first compressor 21, the third sub-heat exchanger 223, and the outdoor fan 37 are all housed within the outdoor unit casing. In this configuration, the sixth sub-heat exchanger 323 is housed within the exhaust duct 02, the first sub-heat exchanger 221 is housed within the supply duct 01, and the second compressor 31, the seventh sub-heat exchanger 324, the first compressor 21, the third sub-heat exchanger 223, and their corresponding fans are all housed within the outdoor unit casing. By placing a portion of the outdoor unit components within the exhaust duct 02 and the remaining components within the outdoor unit casing, only one outdoor unit is needed to meet the requirements of both the second heat pump system 3 and the first heat pump system 2, reducing the space occupied by the outdoor unit and the workload of its installation.

[0073] Furthermore, in this embodiment, both the seventh sub-heat exchanger 324 and the third sub-heat exchanger 323 are located in the outdoor environment, and the heat exchange area of ​​the seventh sub-heat exchanger 324 is different from that of the third sub-heat exchanger 323.

[0074] In this embodiment of the invention, reference is made to Figure 3The control device 11 of the environmental control equipment includes: a processor 1001 (e.g., CPU), a memory 1002, a timer 1003, etc. The components in the control device 11 are connected via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0075] Those skilled in the art will understand that Figure 3 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0076] like Figure 3 As shown, the memory 1002, which serves as a storage medium, may include a control program for an environmental control device. Figure 3 In the device shown, the processor 1001 can be used to call the control program of the environmental control device stored in the memory 1002 and execute the relevant steps of the control method of the environmental control device in the following embodiments.

[0077] This invention also provides a control method for an environmental control device, which is applied to the environmental control device.

[0078] Reference Figure 4 This application proposes an embodiment of a control method for an environmental conditioning device. In this embodiment, the environmental conditioning device includes a first heat pump system and a second heat pump system. The first heat pump system includes a first compressor, and the second heat pump system includes a second compressor. The distance between the installation positions of the first compressor and the second compressor is less than a preset distance. The control method for the environmental conditioning device includes:

[0079] Step S10: Obtain the first frequency of the first compressor and the second frequency of the second compressor;

[0080] The first frequency and the second frequency can be the current operating frequency of the corresponding compressor, or the first frequency and the second frequency can be the target frequency that the corresponding compressor needs to achieve during its current operation.

[0081] Specifically, step S10 can be executed when the environmental control equipment is started, or it can be executed during the continuous operation of the environmental control equipment after it is started.

[0082] Step S20: When the first frequency and the second frequency reach the beat frequency condition, control the first compressor and the second compressor to adjust their frequencies.

[0083] Beat frequency specifically refers to the phenomenon of abnormal noise generated when adjacent compressors operate together and their operating frequencies are similar or in a multiple relationship.

[0084] The beat frequency condition specifically refers to the target quantitative relationship, target magnitude relationship, or respective target numerical intervals that the first frequency and the second frequency need to reach when the first compressor and the second compressor have a beat frequency risk.

[0085] Specifically, in this embodiment, the beat frequency condition includes at least one of the following conditions:

[0086] the frequency difference between the first frequency and the second frequency is less than a first preset threshold;

[0087] the frequency difference between the first frequency multiplied by a first multiple and the second frequency multiplied by a second multiple is less than a second preset threshold.

[0088] wherein both the first multiple and the second multiple are positive integers, and the first preset threshold is greater than the second preset threshold.

[0089] for example, defining F1 as the first frequency, F2 as the second frequency, a as the first preset threshold, b as the second preset threshold, n as the first multiple and m as the second multiple, then |F1-F2|<a or |n*F1-m*F2|<b.

[0090] in other embodiments, the ratio of the larger frequency to the smaller frequency among the first frequency and the second frequency may also be determined, and if the ratio is a positive integer, it can be determined that the first frequency and the second frequency satisfy the beat frequency condition.

[0091] in one implementation of this embodiment, the first compressor is controlled to operate at an increased frequency and the second compressor is controlled to operate at a decreased frequency. Specifically, the frequency adjustment parameters (such as preset adjustment amplitude or preset adjustment rate, etc.) for the frequency-increasing operation of the first compressor and the frequency-decreasing operation of the second compressor may be fixed values preset in advance, or may be values determined according to the actual operating state of the environment adjustment device. In this embodiment, the frequency adjustment values of the first compressor and the second compressor are the same. In other embodiments, the frequency adjustment values of the first compressor and the second compressor may be different.

[0092] in another implementation of this embodiment, the first compressor is controlled to operate at a decreased frequency and the second compressor is controlled to operate at an increased frequency. Specifically, the frequency adjustment parameters (such as preset adjustment amplitude or preset adjustment rate, etc.) for the frequency-decreasing operation of the first compressor and the frequency-increasing operation of the second compressor may be fixed values preset in advance, or may be values determined according to the actual operating state of the environment adjustment device. In this embodiment, the frequency adjustment values of the first compressor and the second compressor are the same. In other embodiments, the frequency adjustment values of the first compressor and the second compressor may be different.

[0093] In another implementation of this embodiment, the first compressor is controlled to operate at a higher frequency according to a first frequency adjustment value, and the second compressor is controlled to operate at a higher frequency according to a second frequency adjustment value. The first frequency adjustment value and the second frequency adjustment value are different adjustment values. Specifically, the first frequency adjustment value may be greater than the second frequency adjustment value. Alternatively, the first frequency adjustment value may be less than the second frequency adjustment value.

[0094] In another implementation of this embodiment, the first compressor is controlled to operate at a reduced frequency according to a first frequency adjustment value, and the second compressor is controlled to operate at a reduced frequency according to a second frequency adjustment value. The first frequency adjustment value and the second frequency adjustment value are different adjustment values. Specifically, the first frequency adjustment value may be greater than the second frequency adjustment value. Alternatively, the first frequency adjustment value may be less than the second frequency adjustment value.

[0095] Specifically, the frequency of the first compressor and the second compressor can be adjusted using one of the above-mentioned implementation methods; alternatively, the frequency of the first compressor and the second compressor can be adjusted using one of the above-mentioned implementation methods according to the current operating status of the environmental control equipment.

[0096] Regardless of the implementation method, the frequency mismatch risk of the first and second compressors is reduced after frequency adjustment. Specifically, the operating frequencies of the adjusted first and second compressors do not meet the aforementioned frequency mismatch conditions.

[0097] This invention proposes a control method for an environmental control device, which includes a first heat pump system and a second heat pump system, with the compressors in the two heat pump systems installed close to each other. When the frequencies of the first compressor in the first heat pump system and the second compressor in the second heat pump system reach a frequency beat condition, the method controls the first and second compressors to adjust their frequencies. The compressor frequencies in the two heat pump systems are no longer independently controlled, which facilitates coordinated operation between the compressor frequencies of the first and second heat pump systems, avoiding frequency ranges prone to frequency beats. This effectively reduces the risk of frequency beats in environmental control devices with more than one heat pump system, lowers the operating noise of the environmental control device, and improves the user experience of the environmental control device.

[0098] Furthermore, based on the above embodiments, another embodiment of the control method for the environmental conditioning equipment of this application is proposed. In this embodiment, reference is made to... Figure 5 After step S10, the method further includes:

[0099] Step S211: When the first frequency and the second frequency reach the beat frequency condition, obtain the ambient temperature of the target environment;

[0100] Specifically, the target environment here includes indoor and / or outdoor environments.

[0101] Step S212: When the ambient temperature is lower than the preset frosting temperature, obtain the first heat exchange area of ​​the first heat exchanger and the second heat exchange area of ​​the second heat exchanger. The first heat exchanger is the heat exchanger in the first heat pump system that is located in the target environment and is in an evaporation state, and the second heat exchanger is the heat exchanger in the second heat pump system that is located in the target environment and is in an evaporation state.

[0102] When the ambient temperature is lower than the preset frosting temperature, it indicates that there is a risk of frosting on the first and second heat exchangers.

[0103] The first heat exchange area is the surface area of ​​the first heat exchanger, and the second heat exchange area is the surface area of ​​the second heat exchanger. The first and second heat exchange areas can be pre-stored parameters, specifically obtained by reading area data stored in a preset area. Alternatively, the first and second heat exchange areas can also be parameters determined by user-input commands.

[0104] Step S213: When the first heat exchange area is smaller than the second heat exchange area, execute the step of controlling the first compressor to operate at a higher frequency and controlling the second compressor to operate at a lower frequency.

[0105] Step S214: When the first heat exchange area is greater than or equal to the second heat exchange area, execute the step of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency.

[0106] In this embodiment, the ambient temperature is lower than the preset frosting temperature, indicating that the heat exchanger in the evaporation state in the target environment is at risk of frosting. The pressure on the low-pressure side of the heat pump system with a large heat exchange area is lower, making the heat exchanger in the evaporation state more likely to frost in the target environment. Therefore, the compressor frequency is reduced in the heat pump system with a large heat exchange area and the compressor frequency is increased in the heat pump system with a small heat exchange area. This helps to reduce the risk of frequency mismatch between the two compressors and reduce the risk of frosting of the heat exchanger.

[0107] Furthermore, based on any of the above embodiments, another embodiment of the control method for the environmental conditioning equipment of this application is proposed. In this embodiment, reference is made to... Figure 6 After step S10, the method further includes:

[0108] Step S221: When the first frequency and the second frequency reach the beat frequency condition, obtain the first maximum frequency currently allowed to operate of the first heat pump system and the second maximum frequency currently allowed to operate of the second heat pump system.

[0109] The first and second maximum frequencies are specifically the maximum frequencies allowed for reliable operation of the corresponding heat pump systems.

[0110] The first maximum frequency can be determined based on the first operating parameters of the components in the first heat pump system and / or the first environmental parameters of the environment in which they are located. The second maximum frequency can be determined based on the second operating parameters of the components in the heat pump system and / or the second environmental parameters of the environment in which they are located.

[0111] Step S222: When the first maximum frequency is greater than the second maximum frequency, execute the step of controlling the first compressor to increase its frequency and controlling the second compressor to decrease its frequency.

[0112] Step S223: When the first maximum frequency is less than or equal to the second maximum frequency, execute the step of controlling the first compressor to operate at a lower frequency and controlling the second compressor to operate at a higher frequency.

[0113] In this embodiment, the compressor in the heat pump system with the higher maximum frequency increases its frequency, while the compressor in the heat pump system with the lower maximum frequency decreases its frequency. This helps reduce the risk of frequency mismatch between the two compressors while ensuring the reliability of the environmental control equipment.

[0114] Furthermore, based on any of the above embodiments, another embodiment of the control method for the environmental conditioning equipment of this application is proposed. In this embodiment, reference is made to... Figure 7 Following S10, the method further includes:

[0115] Step S231: When the first frequency and the second frequency reach the beat frequency condition, obtain the first maximum frequency that the first heat pump system is currently allowed to operate and the second maximum frequency that the second heat pump system is currently allowed to operate.

[0116] The first and second maximum frequencies here are the same concepts as the first and second maximum frequencies mentioned above, and will not be elaborated upon here.

[0117] Step S232: Determine the first difference between the first maximum frequency and the first frequency, and determine the second difference between the second maximum frequency and the second frequency;

[0118] Step S233: When the first difference is greater than the second difference, execute the step of controlling the first compressor to operate at a higher frequency and controlling the second compressor to operate at a lower frequency.

[0119] Step S234: When the first difference is less than or equal to the second difference, execute the step of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency.

[0120] In this embodiment, the compressor in the heat pump system with a large deviation between the current frequency and the maximum frequency increases its frequency, while the compressor in the heat pump system with a small deviation between the current frequency and the maximum frequency decreases its frequency. This ensures that the compressor will not exceed the maximum frequency after increasing its frequency, thereby reducing the risk of frequency mismatch between the two compressors and ensuring the reliability of the environmental control equipment.

[0121] Furthermore, based on any of the above embodiments, after step S211, when the ambient temperature is greater than or equal to the preset frosting temperature, steps S221 to S223 or steps S231 to S234 can be executed.

[0122] Furthermore, based on any of the above embodiments, another embodiment of the control method for the environmental conditioning equipment of this application is proposed. In this embodiment, reference is made to... Figure 8 After step S20, the following steps are also included:

[0123] Step S30: Determine that the first compressor and the second compressor are target compressors respectively;

[0124] Step S40: When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after increasing the frequency is within the resonant frequency range, the target compressor is controlled to increase its frequency to the upper limit frequency for operation. The frequencies within the resonant frequency range are all lower than the upper limit frequency.

[0125] Resonance specifically refers to the phenomenon where the compressor's operating frequency resonates with the vibration frequency of the pipes during operation at various frequency ranges, increasing the vibration amplitude and noise of the connected pipes. The resonant frequency range is specifically the set of all frequencies at which the compressor's operation produces resonance.

[0126] The resonant frequency ranges corresponding to the first compressor and the second compressor may be different.

[0127] Step S50: When the target compressor adjusts its frequency in the direction of frequency reduction and the operating frequency after frequency reduction is within the resonant frequency range, the target compressor is controlled to reduce its frequency to the lower limit frequency. The frequencies within the resonant frequency range are all greater than the lower limit frequency.

[0128] When the first compressor operates at an increased frequency and the second compressor operates at a decreased frequency in step S20, the first compressor can be controlled to increase its frequency according to a third frequency adjustment value, and the second compressor can be controlled to decrease its frequency according to a fourth frequency adjustment value. The third and fourth frequency adjustment values ​​can have different values ​​depending on the beat frequency conditions reached by the first and second frequencies. When the frequency of the first compressor after frequency increase is within its resonant frequency range, it can operate at its upper limit frequency. When the frequency of the first compressor after frequency increase is outside its resonant frequency range, it can maintain its increased frequency operation. Similarly, when the frequency of the second compressor after frequency decrease is within its resonant frequency range, it can operate at its lower limit frequency. When the frequency of the second compressor after frequency decrease is outside its resonant frequency range, it can maintain its increased frequency operation.

[0129] When the first compressor operates at a reduced frequency and the second compressor operates at a increased frequency in step S20, the first compressor can be controlled to operate at a reduced frequency according to the fifth frequency adjustment value, and the second compressor can be controlled to operate at a increased frequency according to the sixth frequency adjustment value. The fifth and sixth frequency adjustment values ​​may correspond to different values ​​if the beat frequency conditions reached by the first and second frequencies are different. When the frequency of the first compressor after frequency reduction is within its resonant frequency range, it can operate at the lower limit frequency corresponding to the first compressor. When the frequency of the first compressor after frequency reduction is outside its resonant frequency range, the first compressor can maintain the frequency after frequency increase. When the frequency of the second compressor after frequency increase is within its resonant frequency range, it can operate at the upper limit frequency corresponding to the second compressor. When the frequency of the second compressor after frequency increase is outside its resonant frequency range, the second compressor can maintain the frequency after frequency increase.

[0130] In this embodiment, by using the above method, the compressor with adjusted frequency can avoid the resonant frequency range where resonance will occur, thus avoiding frequency beat phenomenon between the first compressor and the second compressor, and avoiding resonance phenomenon of each compressor itself, which can effectively reduce the noise generated during the operation of the environmental control equipment.

[0131] Furthermore, in this embodiment, after step S30, the method further includes: when the direction of the target compressor frequency adjustment is frequency increase and the operating frequency after frequency increase is within the resonant frequency range, and the upper limit frequency is less than or equal to the third maximum frequency allowed for operation of the target compressor, the step of controlling the target compressor to increase the frequency to the upper limit frequency is executed.

[0132] When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after the frequency increase is within the resonant frequency range, and the upper limit frequency is greater than the third maximum frequency allowed for the target compressor to operate, the target compressor is controlled to operate at a reference frequency. Based on the reference frequency and a preset frequency adjustment value, the corresponding frequency adjustment parameters are determined to control the other compressor (other than the target compressor) among the first compressor and the second compressor to operate at a lower frequency. The reference frequency includes the lower limit frequency or the operating frequency of the target compressor before the frequency increase.

[0133] When the first compressor operates at an increased frequency and the second compressor operates at a decreased frequency, the preset frequency adjustment value here can be the sum of the third and fourth frequency adjustment values ​​mentioned above. When the first compressor operates at a decreased frequency and the second compressor operates at an increased frequency, the preset frequency adjustment value here can be the sum of the fifth and sixth frequency adjustment values.

[0134] The third maximum frequency here is the same concept as the first and second maximum frequencies mentioned above, and will not be elaborated upon here.

[0135] Specifically, when the first compressor operates at a higher frequency and the operating frequency after the frequency increase is within the resonant frequency range, and the upper limit frequency of the first compressor is greater than its third maximum allowable operating frequency, the lower limit frequency of the first compressor or the sum of the first frequency minus the third frequency adjustment value and the fourth frequency adjustment value is used as the target frequency for the second compressor. The first compressor can operate at its lower limit frequency or the first frequency before the frequency increase, and the second compressor is controlled to operate at the target frequency.

[0136] Specifically, when the second compressor operates at an increased frequency and the operating frequency after the increase is within the resonant frequency range, and the upper limit frequency of the second compressor is greater than its third maximum allowable operating frequency, the lower limit frequency of the second compressor or the sum of the second frequency minus the fifth and sixth frequency adjustment values ​​is used as the target frequency for the first compressor to operate. The second compressor can operate at its lower limit frequency or the second frequency, and the first compressor is controlled to operate at the target frequency.

[0137] In this embodiment, by adopting the above method, it is possible to effectively balance avoiding frequency beats between the first compressor and the second compressor, avoiding resonance between the individual first compressors, and ensuring the reliable operation of the environmental control equipment, thereby reducing the noise of the environmental control equipment while protecting it.

[0138] Furthermore, based on any of the above embodiments, during step S20, the quantitative relationship between the first frequency and the second frequency can be determined. Based on this relationship, a target frequency adjustment parameter (e.g., target frequency adjustment amplitude or target frequency adjustment rate) can be determined. The temperature of the first coil of the heat exchanger in the air duct of the first heat pump system and the temperature of the second coil of the heat exchanger in the air duct of the second heat pump system can be obtained. The temperature difference between the first and second coil temperatures can be determined. Based on the temperature difference, a target ratio between the frequency adjustment parameters of the first compressor and the second compressor can be determined. Specifically, the target ratio can be determined based on the relationship between the temperature difference and the target temperature difference. Based on the target ratio and the target frequency adjustment parameter, frequency adjustment parameters corresponding to the first compressor and the second compressor are determined respectively (e.g., the first and second frequency adjustment values, or the third and fourth frequency adjustment values, or the fifth and sixth frequency adjustment values, etc.). The operating frequencies of the first compressor and the second compressor are adjusted according to the determined frequency adjustment parameters corresponding to the first compressor and the second compressor respectively. Based on this, it is beneficial to reduce the risk of frequency collision in the heat pump system while ensuring that the output capacity of the two systems can reach the ratio required for efficient operation, thereby reducing the risk of frequency collision in the heat pump system and improving the energy efficiency of the dual heat pump system.

[0139] Furthermore, this invention also proposes a storage medium storing a control program for an environmental control device. When the control program for the environmental control device is executed by a processor, it implements the relevant steps of any of the above embodiments of the control method for the environmental control device.

[0140] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0141] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0142] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, environmental control device, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0143] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for an environmental control device, characterized in that, The environmental control equipment includes a first heat pump system and a second heat pump system. The first heat pump system includes a first compressor, and the second heat pump system includes a second compressor. The distance between the installation positions of the first compressor and the second compressor is less than a preset distance. The control method of the environmental control equipment includes the following steps: Obtain the first frequency of the first compressor and the second frequency of the second compressor; When the first frequency and the second frequency reach the beat frequency condition, control the first compressor and the second compressor to adjust their frequency operation. The step of controlling the first compressor and the second compressor to adjust their operating frequencies includes: Control the first compressor to operate at a higher frequency and control the second compressor to operate at a lower frequency, or control the first compressor to operate at a lower frequency and control the second compressor to operate at a higher frequency; After the step of obtaining the first frequency of the first compressor and the second frequency of the second compressor, the method further includes: When the first frequency and the second frequency reach the beat frequency condition, the ambient temperature of the target environment is obtained; When the ambient temperature is lower than the preset frosting temperature, the first heat exchange area of ​​the first heat exchanger and the second heat exchange area of ​​the second heat exchanger are obtained. The first heat exchanger is the heat exchanger in the first heat pump system that is located in the target environment and is in an evaporation state. The second heat exchanger is the heat exchanger in the second heat pump system that is located in the target environment and is in an evaporation state. When the first heat exchange area is smaller than the second heat exchange area, the steps of controlling the first compressor to operate at a higher frequency and controlling the second compressor to operate at a lower frequency are executed. When the first heat exchange area is greater than or equal to the second heat exchange area, the steps of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency are executed.

2. The control method for the environmental control equipment as described in claim 1, characterized in that, After the step of obtaining the ambient temperature of the target environment when the first frequency and the second frequency reach the beat frequency condition, the method further includes: When the ambient temperature is greater than or equal to the preset frosting temperature, obtain the first maximum frequency that the first heat pump system is currently allowed to operate and the second maximum frequency that the second heat pump system is currently allowed to operate. When the first maximum frequency is greater than the second maximum frequency, the steps of controlling the first compressor to operate at an increased frequency and controlling the second compressor to operate at a decreased frequency are executed. When the first maximum frequency is less than or equal to the second maximum frequency, the steps of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency are executed.

3. The control method for the environmental control equipment as described in claim 1, characterized in that, After the step of obtaining the ambient temperature of the target environment when the first frequency and the second frequency reach the beat frequency condition, the method further includes: When the ambient temperature is greater than or equal to the preset frosting temperature, obtain the first maximum frequency that the first heat pump system is currently allowed to operate and the second maximum frequency that the second heat pump system is currently allowed to operate. Determine a first difference between the first maximum frequency and the first frequency, and determine a second difference between the second maximum frequency and the second frequency; When the first difference is greater than the second difference, the steps of controlling the first compressor to operate at a higher frequency and controlling the second compressor to operate at a lower frequency are executed. When the first difference is less than or equal to the second difference, the steps of controlling the first compressor to operate at a reduced frequency and controlling the second compressor to operate at a higher frequency are executed.

4. The control method for the environmental control equipment as described in claim 1, characterized in that, The step of controlling the frequency adjustment of at least one of the first compressor and the second compressor includes: The first compressor is controlled to operate at an increased frequency according to a first frequency adjustment value, and the second compressor is controlled to operate at an increased frequency according to a second frequency adjustment value; or, the first compressor is controlled to operate at a decreased frequency according to a first frequency adjustment value, and the second compressor is controlled to operate at a decreased frequency according to a second frequency adjustment value. The first frequency adjustment value and the second frequency adjustment value are different adjustment values.

5. The control method for the environmental control equipment as described in any one of claims 1 to 4, characterized in that, The beat frequency condition includes at least one of the following conditions: The frequency difference between the first frequency and the second frequency is less than a first preset threshold. The frequency difference between the first frequency (a multiple of the first frequency) and the second frequency (a multiple of the second frequency) is less than a second preset threshold.

6. The control method for the environmental control equipment as described in any one of claims 1 to 4, characterized in that, After the step of controlling the first compressor and the second compressor to adjust their operating frequencies, the method further includes: The first compressor and the second compressor are identified as target compressors. When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after increasing the frequency is within the resonant frequency range, the target compressor is controlled to increase its frequency to the upper limit frequency for operation. The frequencies within the resonant frequency range are all lower than the upper limit frequency. When the target compressor adjusts its frequency in the direction of frequency reduction and the operating frequency after frequency reduction is within the resonant frequency range, the target compressor is controlled to reduce its frequency to the lower limit frequency, and all frequencies within the resonant frequency range are greater than the lower limit frequency.

7. The control method for the environmental control equipment as described in claim 6, characterized in that, After determining that the first compressor and the second compressor are the target compressors, the method further includes: When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after the frequency increase is within the resonant frequency range, and the upper limit frequency is less than or equal to the third maximum frequency that the target compressor is allowed to operate at, the step of controlling the target compressor to increase its frequency to the upper limit frequency is executed; When the target compressor adjusts its frequency in the direction of increasing the frequency and the operating frequency after the frequency increase is within the resonant frequency range, and the upper limit frequency is greater than the third maximum frequency allowed for the target compressor to operate, the target compressor is controlled to operate at a reference frequency. Based on the reference frequency and a preset frequency adjustment value, the corresponding frequency adjustment parameters are determined to control the other compressor (other than the target compressor) among the first compressor and the second compressor to operate at a lower frequency. The reference frequency includes the lower limit frequency or the operating frequency of the target compressor before the frequency increase.

8. An environmental control device, characterized in that, The environmental control equipment includes: A first heat pump system, the first heat pump system including a first compressor; A second heat pump system, the second heat pump system including a second compressor, wherein the distance between the installation position of the first compressor and the installation position of the second compressor is less than a preset distance; A control device, comprising: a memory, a processor, and a control program for an environmental control device stored in the memory and executable on the processor, wherein the control program for the environmental control device, when executed by the processor, implements the steps of the control method for the environmental control device as described in any one of claims 1 to 7.

9. A storage medium, characterized in that, The storage medium stores a control program for an environmental control device, which, when executed by a processor, implements the steps of the control method for an environmental control device as described in any one of claims 1 to 7.

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