Control method of multi-connected air conditioner, multi-connected air conditioner, and storage medium

Abstract

The application discloses a control method of a multi-connected air conditioner, the multi-connected air conditioner and a storage medium. The multi-connected air conditioner comprises at least two terminal devices and at least two fluid pumps. Each terminal device is connected in series with a corresponding fluid pump. The method comprises the following steps: acquiring the opening and closing states of the at least two terminal devices; and controlling the at least two fluid pumps to operate according to the opening and closing states, so as to increase the refrigerant flow of the terminal devices in the starting state. The application aims to improve the heat exchange effect of the multi-connected air conditioner and reduce the refrigerant flow noise.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to a control method for multi-split air conditioners, multi-split air conditioners, and storage media. Background Technology

[0002] In multi-split air conditioners, the refrigerant flow to the corresponding terminal units is mainly regulated by an electronic expansion valve in the indoor unit. When the terminal units are off, the electronic expansion valve operates at a standby opening to ensure the compressor's oil return. However, when only some of the terminal units in a multi-split air conditioner are open, the excessive friction resistance along the piping can cause the electronic expansion valve to malfunction in regulating refrigerant distribution. This not only affects the heat exchange efficiency of the air conditioner but also generates significant refrigerant flow noise. Summary of the Invention

[0003] The main objective of this invention is to provide a control method for a multi-split air conditioner, a multi-split air conditioner, and a storage medium, which aims to improve the heat exchange effect of the multi-split air conditioner and reduce refrigerant flow noise.

[0004] To achieve the above objectives, the present invention provides a control method for a multi-split air conditioner, wherein the multi-split air conditioner includes at least two terminal devices and at least two fluid pumps, each terminal device being connected in series with a corresponding fluid pump, and the control method for the multi-split air conditioner includes the following steps:

[0005] Obtain the open / closed status of the at least two end devices;

[0006] The operation of at least two fluid pumps is controlled according to the open / closed state to increase the refrigerant flow into the terminal equipment in the on-state.

[0007] Optionally, the step of controlling the operation of the at least two fluid pumps according to the open / closed state to increase the refrigerant flow into the terminal equipment in the on / off state includes:

[0008] The fluid pump corresponding to the terminal device in the power-on state is turned on to increase the refrigerant flow into the terminal device in the power-on state, and the fluid pump corresponding to the terminal device in the power-off state is turned off.

[0009] Optionally, after the step of controlling the fluid pump corresponding to the terminal device in the on-state to start to increase the refrigerant flow into the terminal device in the on-state, the method further includes:

[0010] When the terminal device is in the power-on state and is running in cooling mode, the first heat exchange temperature of the terminal device in the power-on state is obtained;

[0011] The first rotational speed control parameter is determined based on the first heat exchange temperature;

[0012] The fluid pump corresponding to the terminal device that is in the powered-on state is controlled to operate according to the first speed control parameter.

[0013] Optionally, the step of determining the first rotational speed control parameter based on the first heat exchange temperature includes:

[0014] When the first heat exchange temperature is greater than the first preset heat exchange temperature, the first speed control parameter is determined to include increasing the speed;

[0015] When the first heat exchange temperature is less than the second preset heat exchange temperature, the first speed control parameter is determined to include reducing the speed;

[0016] When the first heat exchange temperature is not less than the second preset heat exchange temperature and not greater than the first preset heat exchanger temperature, it is determined that the current speed is maintained as the first speed control parameter.

[0017] Wherein, the second preset heat exchange temperature is lower than the first preset heat exchange temperature.

[0018] Optionally, after the step of obtaining the open / closed state of the at least two terminal devices, the method further includes:

[0019] When the terminal device in the power-on state is running in cooling mode, the number of terminal devices in the power-on state and the second heat exchange temperature of the terminal devices in the power-on state are obtained.

[0020] When the quantity exceeds a preset threshold and the second heat exchange temperature exceeds a third preset heat exchange temperature, the steps of controlling the fluid pump corresponding to the terminal device in the on-state to turn on to increase the refrigerant flow into the terminal device in the on-state, and controlling the fluid pump corresponding to the terminal device in the off-state to turn off are executed.

[0021] Optionally, after the step of obtaining the number of terminal devices in the on state and the second heat exchange temperature of the terminal devices in the on state when the terminal devices in the on state are running in cooling mode, the method further includes:

[0022] When the quantity is not greater than the preset threshold, or when the second heat exchange temperature is not greater than the third preset heat exchange temperature, the fluid pump corresponding to the terminal device that is in the power-on state is controlled to shut down.

[0023] Optionally, after the step of controlling the fluid pump corresponding to the terminal device in the on-state to start to increase the refrigerant flow into the terminal device in the on-state, the method further includes:

[0024] When the terminal device is in the power-on state and running in heating mode, the system pressure of the multi-split air conditioner is obtained;

[0025] The second speed control parameter is determined based on the system pressure.

[0026] The fluid pump corresponding to the terminal device that is in the powered-on state is controlled to operate according to the second speed control parameter.

[0027] Optionally, the step of determining the second speed control parameter based on the system pressure includes:

[0028] When the system pressure is greater than the first preset pressure, the second speed control parameter is determined to include increasing the speed;

[0029] When the system pressure is less than the second preset pressure, the second speed control parameter is determined to include reducing the speed;

[0030] When the system pressure is not greater than the first preset pressure and not less than the second preset pressure, it is determined that the current speed is maintained as the first speed control parameter.

[0031] Wherein, the second preset pressure is less than the first preset pressure.

[0032] Optionally, the multi-split air conditioner further includes an outdoor heat exchanger, a throttling device, and a compressor. The at least two terminal devices, the throttling device, and the outdoor heat exchanger are connected in sequence. The step of controlling the fluid pump corresponding to the terminal device in the on-state to increase the refrigerant flow into the terminal device in the on-state includes:

[0033] When the terminal device is in the cooling mode while it is powered on, the corresponding fluid pump is controlled to start in the first direction to increase the refrigerant flow from the throttling device to the corresponding terminal device.

[0034] When the terminal device is in the heating mode and is powered on, the corresponding fluid pump is controlled to start in the second direction to increase the refrigerant flow from the compressor to the corresponding terminal device.

[0035] Optionally, after the step of controlling the operation of the at least two fluid pumps according to the open / closed state to increase the refrigerant flow into the terminal equipment in the on / off state, the method further includes:

[0036] When the multi-split air conditioner reaches the oil return condition, the fluid pump corresponding to the terminal device that is in the off state is turned on to drive the refrigerant in the off terminal device to flow back to the compressor of the multi-split air conditioner.

[0037] Optionally, the at least two terminal devices include at least one of the following types: convection heat exchanger, hydraulic module, and radiation heat exchanger.

[0038] In addition, to achieve the above objectives, this application also proposes a multi-split air conditioner, which includes a control device, at least two terminal devices and at least two fluid pumps, with each terminal device connected in series with a corresponding fluid pump;

[0039] The at least two fluid pumps are connected to the control device, which includes a memory, a processor, and a control program for a multi-split air conditioner stored in the memory and executable on the processor. When the control program for the multi-split air conditioner is executed by the processor, it implements the steps of the control method for the multi-split air conditioner as described above.

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

[0041] This invention proposes a control method for a multi-split air conditioner. The multi-split air conditioner is equipped with a fluid pump connected in series with the terminal equipment. The method adapts to the on / off states of at least two terminal equipment in the multi-split air conditioner, controlling the operation of at least two fluid pumps. This ensures that when the pipeline friction resistance is too high, the fluid pumps can assist in adjusting the flow rate, increasing the refrigerant flow into the terminal equipment in the on state and decreasing the refrigerant flow into the terminal equipment in the off state. This ensures that more refrigerant is available to meet heat exchange requirements. Furthermore, the reduced refrigerant flow resistance driven by the fluid pumps effectively reduces refrigerant flow noise. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the refrigerant system structure of an embodiment of the multi-split air conditioner of the present invention;

[0043] Figure 2 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the multi-split air conditioner of the present invention;

[0044] Figure 3 This is a flowchart illustrating an embodiment of the control method for a multi-split air conditioner according to the present invention;

[0045] Figure 4 This is a flowchart illustrating another embodiment of the control method for a multi-split air conditioner according to the present invention;

[0046] Figure 5 This is a flowchart illustrating another embodiment of the control method for a multi-split air conditioner according to the present invention;

[0047] Figure 6 This is a flowchart illustrating another embodiment of the control method for multi-split air conditioners of the present invention.

[0048] 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

[0049] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0050] This invention provides a multi-split air conditioner.

[0051] In this embodiment of the invention, reference is made to Figure 1 and Figure 2 The multi-split air conditioner includes a control device 100, at least two terminal devices 1, and at least two fluid pumps 2. Each terminal device 1 is connected in series with a corresponding fluid pump 2. Each terminal device 1 corresponds to one or more fluid pumps 2. Different terminal devices 1 may correspond to different fluid pumps 2, or some terminal devices 1 may share a single fluid pump 2. In this embodiment, the terminal devices 1 and fluid pumps 2 are arranged in a one-to-one correspondence.

[0052] At least two terminal devices 1 include at least one of the following types: convection heat exchanger 11, hydraulic module 12, and radiation heat exchanger (not shown). In this embodiment, at least two terminal devices 1 include at least two convection heat exchangers 11 and hydraulic modules 12. The convection heat exchanger 11 may include ducted air conditioners, etc.

[0053] In this embodiment, the multi-split air conditioner includes a compressor 3, an outdoor heat exchanger 4, a throttling device 5, and a reversing assembly 6. The outdoor heat exchanger 4, the throttling device 5, at least two fluid pumps 2, and at least two terminal devices 1 are connected in sequence. The exhaust port of the at least two terminal devices 1, the outdoor heat exchanger 4, and the return port of the compressor 3 are all connected to the reversing assembly 6.

[0054] When the multi-split air conditioner is in heating mode, the reversing assembly 6 is in the first operating state. The exhaust port of the compressor 3 is connected to at least two terminal devices 1, and the return port of the compressor 3 is connected to the outdoor heat exchanger 4. The refrigerant discharged by the compressor 3 flows through at least two terminal devices 1, the throttling device 5, and the outdoor heat exchanger 4 in sequence before flowing back to the compressor 3.

[0055] When the multi-split air conditioner is in cooling mode, the reversing assembly 6 is in the second operating state. The exhaust port of the compressor 3 is connected to the heat exchanger, and the return port of the compressor 3 is connected to at least two terminal devices 1. The refrigerant discharged by the compressor 3 flows through the outdoor heat exchanger 4, the throttling device 5, and at least two terminal devices 1 in sequence before returning to the compressor 3.

[0056] In other embodiments, the multi-split air conditioner includes a compressor 3, an outdoor heat exchanger 4, and a throttling device 5. The exhaust port of the compressor 3, the outdoor heat exchanger 4, the throttling device 5, and at least two terminal devices 1 and the return port of the compressor 3 are connected in sequence. Alternatively, the exhaust port of the compressor 3, at least two terminal devices 1, the throttling device 5, the outdoor heat exchanger 4, and the return port of the compressor 3 are connected in sequence.

[0057] In this embodiment of the invention, reference is made to Figure 2 The control device 100 for a multi-split air conditioner includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. The memory 1002 can be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0058] Those skilled in the art will understand that Figure 2 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.

[0059] like Figure 2 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a multi-split air conditioner.

[0060] exist Figure 2 In the device shown, the processor 1001 can be used to call the control program of the multi-split air conditioner stored in the memory 1002 and execute the relevant steps of the control method of the multi-split air conditioner in the following embodiments.

[0061] This invention also provides a control method for a multi-split air conditioner, applicable to the aforementioned multi-split air conditioner.

[0062] Reference Figure 3 This application proposes an embodiment of a control method for a multi-split air conditioner. In this embodiment, the control method for the multi-split air conditioner includes:

[0063] Step S10: Obtain the open / closed status of the at least two terminal devices;

[0064] The open / closed state includes the power-on state or the power-off state.

[0065] The power-on status indicates that the corresponding terminal device has a heat exchange requirement, while the power-off status indicates that the corresponding terminal device does not have a heat exchange requirement.

[0066] Step S20: Control the operation of at least two fluid pumps according to the open / closed state to increase the refrigerant flow into the terminal equipment in the on / off state.

[0067] If at least two terminal devices have different open / closed states, then at least two fluid pumps will have different operating parameters. Operating parameters are determined based on the open / closed states, and these parameters include open / closed control parameters, directional control parameters, speed control parameters, and so on.

[0068] In this case, the speed of the fluid pump corresponding to the terminal device in the open state can be greater than the speed of the fluid pump corresponding to the terminal device in the closed state. Alternatively, the direction of rotation of the fluid pump of the terminal device in the open state can be opposite to that of the fluid pump of the terminal device in the closed state.

[0069] This invention proposes a control method for a multi-split air conditioner. The multi-split air conditioner is equipped with a fluid pump connected in series with the terminal devices. The method adapts to the on / off states of at least two terminal devices in the multi-split air conditioner to control the operation of at least the fluid pump. This ensures that when the pipeline friction resistance is too high, the fluid pump can assist in adjusting the flow rate, increasing the refrigerant flow into the terminal devices in the on state and decreasing the refrigerant flow into the terminal devices in the off state. This ensures that more refrigerant is available to meet heat exchange requirements. Furthermore, the reduced refrigerant flow resistance driven by the fluid pump effectively reduces refrigerant flow noise, thereby improving the heat exchange effect of the multi-split air conditioner and reducing refrigerant flow noise.

[0070] Furthermore, in this embodiment, the fluid pump corresponding to the terminal device in the on state is turned on to increase the refrigerant flow into the terminal device in the on state, and the fluid pump corresponding to the terminal device in the off state is turned off, thereby saving the energy consumption of the fluid pump while improving the heat exchange effect of the multi-split air conditioner and reducing the refrigerant flow noise.

[0071] In other embodiments, a ratio can be obtained between the first number of terminal devices in the power-on state and the second number of terminal devices in the power-off state. When the ratio is greater than a preset value, the fluid pump corresponding to the terminal device in the power-on state is controlled to turn on to increase the number of terminal devices in the power-on state, and the fluid pump corresponding to the terminal device in the power-off state is controlled to turn off. When the ratio is not greater than the preset value, the fluid pump corresponding to the terminal device in the power-on state is controlled to turn on in a third direction to increase the refrigerant flow rate into the terminal device in the power-on state, and the fluid pump corresponding to the terminal device in the power-off state is controlled to turn on in a fourth direction to reduce the refrigerant flow rate into the terminal device in the power-off state.

[0072] Furthermore, based on the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 4After the step of controlling the fluid pump corresponding to the terminal device in the on-state to start to increase the refrigerant flow rate into the terminal device in the on-state, the method further includes:

[0073] Step S21: When the terminal device in the power-on state is running in cooling mode, obtain the first heat exchange temperature of the terminal device in the power-on state.

[0074] When the terminal equipment is running in cooling mode, the refrigerant discharged from the compressor flows sequentially through the outdoor heat exchanger, the throttling device, and the terminal equipment before returning to the compressor.

[0075] In this embodiment, the terminal device is a convection heat exchanger, which includes an indoor heat exchanger, and the first heat exchange temperature is the coil temperature of the indoor heat exchanger. In other embodiments, the terminal device is a radiative heat exchanger, and the first heat exchange temperature may be the surface temperature of the radiative heat exchanger. Alternatively, the terminal device is a hydraulic module, and the first heat exchange temperature is the surface temperature of the heat exchanger in the hydraulic module.

[0076] Step S22: Determine the first rotational speed control parameter based on the first heat exchange temperature;

[0077] The first speed control parameter includes the target speed of the fluid pump, or the speed adjustment parameters of the fluid pump (such as speed adjustment rate or speed adjustment amplitude), or the speed limit value of the fluid pump.

[0078] Different first heat exchange temperatures correspond to different first speed control parameters. The correspondence between the first heat exchange temperature and the first speed control parameter can be preset, and the correspondence can include calculation relationships, mapping relationships, etc. Based on this correspondence, the first speed control parameter corresponding to the current first heat exchange temperature can be determined. For example, the first speed control parameter can be calculated by substituting the first heat exchange temperature into a preset formula; or, the temperature range in which the first heat exchange temperature lies can be determined, and the first speed control parameter can be determined according to the temperature range.

[0079] In addition, there can be more than one pre-set correspondence between the first heat exchange temperature and the first speed control parameter. During the operation of the multi-split air conditioner, the target correspondence is determined from the more than one correspondence based on the number of terminal devices in the current cooling mode, the ambient temperature of the indoor environment where the terminal devices in the current cooling mode are located, and the number of terminal devices that are currently in the off state. The first speed control parameter corresponding to the first heat exchange temperature is determined based on the target correspondence.

[0080] In this embodiment, the fluid pump corresponding to each terminal device operating in a cooling mode is speed-controlled based on the first heat exchange temperature of the corresponding terminal device. In other embodiments, to improve the rationality of refrigerant distribution and further enhance the energy efficiency and overall heat exchange effect of the multi-split air conditioner, the speed control parameters of the fluid pump of each terminal device operating in a cooling mode can also be determined based on the first heat exchange temperature of all terminal devices operating in cooling modes.

[0081] Step S23: Control the fluid pump corresponding to the terminal device that is in the power-on state to run according to the first speed control parameter.

[0082] In step S23, the fluid pump can be controlled to maintain the current speed for a preset time before returning to step S21.

[0083] In this embodiment, when the terminal device operates in cooling mode, the first speed control parameter of the fluid pump is determined according to the first heat exchange temperature, thereby ensuring that the heat exchange effect of the terminal device can be effectively improved and the refrigerant flow noise can be effectively reduced under the adjustment of the fluid pump.

[0084] Furthermore, in this embodiment, the step of determining the first rotational speed control parameter based on the first heat exchange temperature includes:

[0085] When the first heat exchange temperature is greater than the first preset heat exchange temperature, the first speed control parameter is determined to include increasing the speed;

[0086] When the first heat exchange temperature is less than the second preset heat exchange temperature, the first speed control parameter is determined to include reducing the speed;

[0087] When the first heat exchange temperature is not less than the second preset heat exchange temperature and not greater than the first preset heat exchanger temperature, it is determined that the current speed is maintained as the first speed control parameter.

[0088] Wherein, the second preset heat exchange temperature is lower than the first preset heat exchange temperature.

[0089] The first and second preset heat exchange temperatures can be fixed values ​​set in advance, or they can be values ​​determined based on the actual operating conditions of the multi-split air conditioner. For example, the first and second preset heat exchange temperatures can be determined based on the compressor operating frequency, the number of terminal devices that are turned off, and the outdoor ambient temperature, etc.

[0090] The first preset heat exchange temperature is the maximum heat exchange temperature that the terminal equipment can reach to achieve the best cooling effect, and the second preset heat exchange temperature is the minimum heat exchange temperature that the terminal equipment can reach to achieve the best cooling effect and operate reliably.

[0091] The first speed control parameter may include, when increasing or decreasing the speed, the corresponding speed adjustment value (e.g., speed adjustment amplitude or speed adjustment rate).

[0092] The speed adjustment value when the fluid pump increases or decreases its speed can be a preset fixed value, or it can be a value determined according to the actual operating conditions of the multi-split air conditioner. For example, the speed adjustment value can be determined based on the indoor ambient temperature of the space where all the terminal devices in the cooling mode are located, the corresponding set temperature, and the temperature difference between the heat exchange temperatures of the terminal devices in each cooling mode.

[0093] In this embodiment, the heat exchange temperature of the terminal equipment in cooling mode can be maintained between the first preset heat exchange temperature and the second preset heat exchange temperature through the above method, so as to further improve the cooling effect while ensuring the reliable operation of the multi-split air conditioner.

[0094] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 5 After step S10, the method further includes:

[0095] Step S30: When the terminal device in the power-on state is running in cooling mode, obtain the number of terminal devices in the power-on state and the second heat exchange temperature of the terminal devices in the power-on state.

[0096] The number here represents the total number of all terminal devices that are powered on and running in cooling mode.

[0097] In this embodiment, the terminal device is a convective heat exchanger, which includes an indoor heat exchanger, and the second heat exchange temperature is the coil temperature of the indoor heat exchanger. In other embodiments, the terminal device is a radiative heat exchanger, and the second heat exchange temperature may be the surface temperature of the radiative heat exchanger. Alternatively, the terminal device is a hydraulic module, and the second heat exchange temperature is the surface temperature of the heat exchanger in the hydraulic module.

[0098] Step S40: When the quantity is greater than a preset threshold and the second heat exchange temperature is greater than a third preset heat exchange temperature, the steps of controlling the fluid pump corresponding to the terminal device in the on-state to turn on to increase the refrigerant flow into the terminal device in the on-state, and controlling the fluid pump corresponding to the terminal device in the off-state to turn off are executed.

[0099] The preset threshold can be a fixed value set in advance, for example, the preset threshold is 2 units.

[0100] In this embodiment, the third preset heat exchange temperature is equal to the first preset heat exchange temperature. In other embodiments, the third preset heat exchange temperature may be less than the first preset heat exchange temperature but greater than the second preset heat exchange temperature.

[0101] In this embodiment, when there are many terminal devices with cooling activated and the heat exchange temperature is too high, it indicates that there are significant differences in the pipeline and the cooling effect is poor. In this case, timely adjustment of the fluid pump can improve the rationality of refrigerant distribution, thereby effectively improving the cooling effect of the multi-split air conditioner and effectively reducing refrigerant noise.

[0102] Furthermore, after step S30, the method further includes: when the quantity is not greater than the preset threshold, or when the second heat exchange temperature is not greater than the third preset heat exchange temperature, controlling the fluid pump corresponding to the terminal device in the on-state to shut down. Based on this, the energy consumption of the multi-split air conditioner is reduced while ensuring the cooling effect.

[0103] Furthermore, based on any of the above embodiments, another embodiment of the control method for multi-split air conditioners of this application is proposed. In this embodiment, reference is made to... Figure 6 After the step of controlling the fluid pump corresponding to the terminal device in the on-state to start to increase the refrigerant flow rate into the terminal device in the on-state, the method further includes:

[0104] Step S24: When the terminal device in the power-on state is running in heating mode, obtain the system pressure of the multi-split air conditioner;

[0105] When the terminal equipment is in heating mode, the refrigerant discharged from the compressor flows through the terminal equipment, the throttling device, and the outdoor heat exchanger in sequence before returning to the compressor.

[0106] In this embodiment, the system pressure specifically refers to the discharge pressure of the compressor in a multi-split air conditioner. In other embodiments, the system pressure may also be the return gas pressure, etc.

[0107] Step S25: Determine the second speed control parameter based on the system pressure;

[0108] The second speed control parameter includes the target speed of the fluid pump, or the speed adjustment parameters of the fluid pump (such as speed adjustment rate or speed adjustment amplitude), or the speed limit value of the fluid pump.

[0109] Different system pressures correspond to different second speed control parameters. The correspondence between system pressure and second speed control parameters can be preset, and this correspondence can include calculation relationships, mapping relationships, etc. Based on this correspondence, the second speed control parameters corresponding to the current system pressure can be determined. For example, the second speed control parameters can be calculated by substituting the system pressure into a preset formula; or, the pressure range of the system pressure can be determined, and the second speed control parameters can be determined based on the pressure range.

[0110] In addition, there can be more than one pre-set correspondence between system pressure and second speed control parameter. During the operation of multi-split air conditioner, the target correspondence is determined from more than one correspondence based on the number of terminal devices in the current heating mode, the ambient temperature of the indoor environment where the terminal devices in the current heating mode are located, and the number of terminal devices that are currently in the off state. The second speed control parameter corresponding to the system pressure is determined based on the target correspondence.

[0111] In this embodiment, the fluid pump corresponding to each terminal device operating in heating mode has its speed controlled according to the system pressure. In other embodiments, to improve the rationality of refrigerant distribution and further enhance the energy efficiency and overall heat exchange effect of the multi-split air conditioner, the speed control parameters of the fluid pump corresponding to each terminal device operating in heating mode can also be determined based on the system pressure and the inlet and outlet temperature difference of all terminal devices operating in heating mode.

[0112] Step S26: Control the fluid pump corresponding to the terminal device that is in the power-on state to run according to the second speed control parameter.

[0113] In step S26, the fluid pump can be controlled to maintain the current speed for a preset time before returning to step S24.

[0114] In this embodiment, when the terminal device operates in heating mode, the second speed control parameter of the fluid pump is determined according to the system pressure, thereby ensuring that the heating effect of the terminal device can be effectively improved and the refrigerant flow noise can be effectively reduced under the adjustment of the fluid pump.

[0115] Furthermore, in this embodiment, the step of determining the second speed control parameter based on the system pressure includes:

[0116] When the system pressure is greater than the first preset pressure, the second speed control parameter is determined to include increasing the speed;

[0117] When the system pressure is less than the second preset pressure, the second speed control parameter is determined to include reducing the speed;

[0118] When the system pressure is not greater than the first preset pressure and not less than the second preset pressure, it is determined that the current speed is maintained as the first speed control parameter.

[0119] Wherein, the second preset pressure is less than the first preset pressure.

[0120] The first and second preset pressures can be fixed values ​​set in advance, or they can be values ​​determined based on the actual operating conditions of the multi-split air conditioner. For example, the first and second preset pressures can be determined based on the compressor operating frequency, the number of terminal devices that are turned off, and the outdoor ambient temperature, etc.

[0121] The first preset pressure is the maximum heat exchange temperature that the terminal equipment can reach to achieve the best heating effect and reliable operation, and the second preset pressure is the minimum heat exchange temperature that the terminal equipment can reach to achieve the best heating effect.

[0122] The second speed control parameter may include, when increasing or decreasing the speed, the corresponding speed adjustment value (e.g., speed adjustment amplitude or speed adjustment rate).

[0123] The speed adjustment value when the fluid pump increases or decreases its speed can be a preset fixed value, or it can be a value determined according to the actual operating conditions of the multi-split air conditioner. For example, the speed adjustment value can be determined based on the indoor ambient temperature of the space where all the terminal devices in the cooling mode are located, the corresponding set temperature, and the temperature difference between the heat exchange temperatures of the terminal devices in each cooling mode.

[0124] In this embodiment, the heat exchange temperature of the terminal equipment in cooling mode can be maintained between the first preset heat exchange temperature and the second preset heat exchange temperature through the above method, so as to further improve the cooling effect while ensuring the reliable operation of the multi-split air conditioner.

[0125] Furthermore, in this embodiment, the multi-split air conditioner also includes an outdoor heat exchanger, a throttling device, and a compressor, with the at least two terminal devices, the throttling device, and the outdoor heat exchanger connected sequentially. The step of controlling the fluid pump corresponding to the terminal device in the on-state to increase the refrigerant flow into the on-state terminal device includes: when the on-state terminal device is in cooling mode, controlling the corresponding fluid pump to open in a first direction to increase the refrigerant flow from the throttling device to the corresponding terminal device; when the on-state terminal device is in heating mode, controlling the corresponding fluid pump to open in a second direction to increase the refrigerant flow from the compressor to the corresponding terminal device.

[0126] In this embodiment, by means of the above method, the fluid pump corresponding to the terminal device in the power-on state can adapt to different modes to switch operation, thereby ensuring that each terminal device is equipped with a fluid pump to effectively improve the heat exchange effect in different modes.

[0127] In other embodiments, a first fluid pump and a second fluid pump may be respectively installed at both ends of the terminal device. When the terminal device is in the cooling mode, the first fluid pump corresponding to the terminal device is turned on and the second fluid pump is turned off to increase the refrigerant flow from the throttling device to the corresponding terminal device. When the terminal device is in the heating mode, the second fluid pump corresponding to the terminal device is turned on and the first fluid pump is turned off to increase the refrigerant flow from the compressor to the corresponding terminal device.

[0128] Furthermore, based on any of the above embodiments, in this embodiment, after step S20, it further includes: when the multi-split air conditioner reaches the oil return condition, controlling the fluid pump corresponding to the terminal device in the off state to start so as to drive the refrigerant in the terminal device in the off state to flow back to the compressor of the multi-split air conditioner.

[0129] In this embodiment, at least two terminal devices include at least two convection heat exchange devices and a hydraulic module. When the hydraulic module is in heating mode and the other convection heat exchange devices are in shutdown mode, if the multi-split air conditioner reaches the oil return condition, the fluid pumps corresponding to the convection heat exchange devices in shutdown mode are controlled to turn on in sequence to drive the refrigerant back to the compressor.

[0130] In this embodiment, the above method can achieve the goal that the reversing component does not need to reverse during the operation of the multi-split air conditioner, without affecting the operation of the terminal equipment that is in the start-up state, and can also achieve effective oil return, thereby effectively improving the heat exchange effect and operational stability of the multi-split air conditioner.

[0131] Furthermore, this embodiment of the invention also proposes a storage medium storing a control program for a multi-split air conditioner. When the control program for the multi-split air conditioner is executed by a processor, it implements the relevant steps of any embodiment of the control method for the multi-split air conditioner described above.

[0132] The specific implementation of the control method for multi-split air conditioners is as described in the above embodiments. Since the storage medium in this embodiment adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0133] 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.

[0134] 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.

[0135] 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, multi-split air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0136] 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 a multi-split air conditioner, characterized in that, The multi-split air conditioner includes at least two terminal devices and at least two fluid pumps, with each terminal device connected in series with a corresponding fluid pump. The control method for the multi-split air conditioner includes the following steps: Obtain the open / closed status of the at least two end devices; When the terminal device in the power-on state is running in cooling mode, the number of terminal devices in the power-on state and the second heat exchange temperature of the terminal devices in the power-on state are obtained. When the quantity exceeds a preset threshold and the second heat exchange temperature exceeds a third preset heat exchange temperature, the fluid pump corresponding to the terminal device in the on-state is controlled to turn on to increase the refrigerant flow into the terminal device in the on-state, and the fluid pump corresponding to the terminal device in the off-state is controlled to turn off.

2. The control method for a multi-split air conditioner as described in claim 1, characterized in that, After the step of controlling the fluid pump corresponding to the terminal device in the on-state to start to increase the refrigerant flow into the terminal device in the on-state, the method further includes: When the terminal device is in the power-on state and is running in cooling mode, the first heat exchange temperature of the terminal device in the power-on state is obtained; The first rotational speed control parameter is determined based on the first heat exchange temperature; The fluid pump corresponding to the terminal device that is in the powered-on state is controlled to operate according to the first speed control parameter.

3. The control method for a multi-split air conditioner as described in claim 2, characterized in that, The step of determining the first speed control parameter based on the first heat exchange temperature includes: When the first heat exchange temperature is greater than the first preset heat exchange temperature, the first speed control parameter is determined to include increasing the speed; When the first heat exchange temperature is less than the second preset heat exchange temperature, the first speed control parameter is determined to include reducing the speed; When the first heat exchange temperature is not less than the second preset heat exchange temperature and not greater than the first preset heat exchange temperature, it is determined that the current speed is maintained as the first speed control parameter. Wherein, the second preset heat exchange temperature is lower than the first preset heat exchange temperature.

4. The control method for a multi-split air conditioner as described in claim 1, characterized in that, After the step of obtaining the number of terminal devices in the on state and the second heat exchange temperature of the terminal devices in the on state when the terminal devices in the on state are running in cooling mode, the method further includes: When the quantity is not greater than the preset threshold, or when the second heat exchange temperature is not greater than the third preset heat exchange temperature, the fluid pump corresponding to the terminal device that is in the power-on state is controlled to shut down.

5. The control method for a multi-split air conditioner as described in claim 1, characterized in that, After the step of controlling the fluid pump corresponding to the terminal device in the on-state to start to increase the refrigerant flow into the terminal device in the on-state, the method further includes: When the terminal device is in the power-on state and running in heating mode, the system pressure of the multi-split air conditioner is obtained; The second speed control parameter is determined based on the system pressure. The fluid pump corresponding to the terminal device that is in the powered-on state is controlled to operate according to the second speed control parameter.

6. The control method for a multi-split air conditioner as described in claim 5, characterized in that, The step of determining the second speed control parameter based on the system pressure includes: When the system pressure is greater than the first preset pressure, the second speed control parameter is determined to include increasing the speed; When the system pressure is less than the second preset pressure, the second speed control parameter is determined to include reducing the speed; When the system pressure is not greater than the first preset pressure and not less than the second preset pressure, it is determined that the current speed is maintained as the second speed control parameter. Wherein, the second preset pressure is less than the first preset pressure.

7. The control method for a multi-split air conditioner as described in claim 1, characterized in that, The multi-split air conditioner also includes an outdoor heat exchanger, a throttling device, and a compressor. The at least two terminal devices, the throttling device, and the outdoor heat exchanger are connected in sequence. The step of controlling the fluid pump corresponding to the terminal device in the on-state to increase the refrigerant flow into the terminal device in the on-state includes: When the terminal device is in the cooling mode while it is powered on, the corresponding fluid pump is controlled to start in the first direction to increase the refrigerant flow from the throttling device to the corresponding terminal device. When the terminal device is in the heating mode and is powered on, the corresponding fluid pump is controlled to start in the second direction to increase the refrigerant flow from the compressor to the corresponding terminal device.

8. The control method for a multi-split air conditioner as described in any one of claims 1 to 7, characterized in that, After the steps of controlling the fluid pump corresponding to the terminal device in the on state to turn on to increase the refrigerant flow into the terminal device in the on state, and controlling the fluid pump corresponding to the terminal device in the off state to turn off, the method further includes: When the multi-split air conditioner reaches the oil return condition, the fluid pump corresponding to the terminal device that is in the off state is turned on to drive the refrigerant in the off terminal device to flow back to the compressor of the multi-split air conditioner.

9. The control method for a multi-split air conditioner as described in any one of claims 1 to 7, characterized in that, The at least two terminal devices include at least one of the following types: convection heat exchange equipment, hydraulic module, and radiation heat exchange equipment.

10. A multi-split air conditioner, characterized in that, The multi-split air conditioner includes a control device, at least two terminal devices, and at least two fluid pumps, with each terminal device connected in series with a corresponding fluid pump. The at least two fluid pumps are connected to the control device, which includes a memory, a processor, and a control program for a multi-split air conditioner stored in the memory and executable on the processor. When the control program for the multi-split air conditioner is executed by the processor, it implements the steps of the control method for a multi-split air conditioner as described in any one of claims 1 to 9.

11. A storage medium, characterized in that, The storage medium stores a control program for a multi-split air conditioner, which, when executed by a processor, implements the steps of the control method for a multi-split air conditioner as described in any one of claims 1 to 9.

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