Multi-connected air conditioning system, heat dissipation control method thereof, and computer-readable storage medium

Abstract

The present invention discloses a multi-split air conditioning system, a heat dissipation control method thereof, and a computer-readable storage medium. The method comprises: in the full heat recovery mode of the multi-split air conditioning system, detecting the current temperature of a compressor drive module; when the current temperature falls within a first temperature range, determining the opening of a main expansion valve and the speed of an outdoor unit fan; controlling the power supply of a four-way valve, and controlling the operation of the multi-split air conditioning system based on the opening and speed, so that the refrigerant passes through an outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation. The present invention enables the drive module to effectively dissipate heat.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a multi-connected air conditioning system, a heat dissipation control method thereof, and a computer-readable storage medium. Background Art

[0002] The heat recovery multi-split system is a three-pipe multi-split air-conditioning system, equipped with high and low pressure pipes, gas pipes and liquid pipes. It can be matched with a two-pipe indoor unit through an adapter, or directly matched with a corresponding three-pipe indoor unit, so that the indoor units in the air-conditioning system can run heating and cooling modes at the same time. That is, the heat recovery multi-split system can allow some indoor units to run in cooling mode while some indoor units can run in heating mode.

[0003] Because in full heat recovery mode, the outdoor unit's heat exchanger does not participate in the air-conditioning system circulation and the refrigerant does not flow through the outdoor unit's heat dissipation module, the compressor's drive module cannot effectively dissipate heat. Especially under high load conditions, the drive module temperature will rise sharply, causing damage to the drive module. Summary of the Invention

[0004] The main purpose of the present invention is to provide a multi-split air conditioning system and a heat dissipation control method and a computer-readable storage medium thereof, aiming to solve the problem of how to dissipate heat from a drive module.

[0005] To achieve the above objectives, the present invention provides a heat dissipation control method for a multi-split air conditioning system, wherein the multi-split air conditioning system is provided with a four-way valve and a main expansion valve, wherein the four-way valve is connected to the indoor unit, the compressor, and the outdoor unit, respectively, and the main expansion valve is provided on the outdoor unit side. The heat dissipation control method for the multi-split air conditioning system comprises the following steps:

[0006] In the full heat recovery mode of the multi-split air conditioning system, detecting the current temperature of the compressor drive module;

[0007] When the current temperature falls within the first temperature range, determining the opening of the main expansion valve and the speed of the outdoor unit fan;

[0008] The four-way valve is controlled to be powered on, and the multi-connected air-conditioning system is controlled to operate according to the opening and the speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0009] In one embodiment, after the step of detecting the current temperature of the compressor driving module, the method further includes:

[0010] When the current temperature falls within a second temperature range, determining that the main expansion valve is at its maximum opening and the outdoor fan is at its maximum speed, and the minimum temperature value in the second temperature range is greater than the maximum temperature value in the first temperature range;

[0011] The four-way valve is controlled to be powered off, and the multi-connected air-conditioning system is controlled to operate according to the maximum opening and the maximum speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0012] In one embodiment, after the step of detecting the current temperature of the compressor driving module, the method further includes:

[0013] When the current temperature falls within the third temperature range, the four-way valve is powered on, the main expansion valve and the outdoor fan are closed, and the maximum temperature value in the third temperature range is less than the minimum temperature value in the first temperature range.

[0014] In one embodiment, when the current temperature falls within the first temperature range, the step of determining the opening of the main expansion valve and the speed of the outdoor unit fan includes:

[0015] When the current temperature belongs to a first sub-range in a first temperature range, determining that the rotation speed is zero and determining that the opening is a first opening value;

[0016] After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes:

[0017] After a preset first time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0018] The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

[0019] In one embodiment, when the current temperature falls within the first temperature range, the step of determining the opening of the main expansion valve and the speed of the outdoor unit fan includes:

[0020] When the current temperature belongs to a second sub-range within the first temperature range, determining the speed to be a first speed value, determining the opening to be a second opening value, the second opening value being greater than the first opening value, and the minimum temperature value in the second sub-range being greater than the maximum temperature value in the first sub-range;

[0021] After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes:

[0022] After the air conditioner has been running for a preset second time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0023] The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

[0024] In one embodiment, when the current temperature falls within the first temperature range, the step of determining the opening of the main expansion valve and the speed of the outdoor unit fan includes:

[0025] When the current temperature falls within a third sub-range of the current temperature range, determining the speed to be a second speed value, determining the opening of the main expansion valve to be a third opening value, the second speed value is greater than the first speed value, the third opening value is greater than the second opening value, and the minimum temperature value in the third sub-range is greater than the maximum temperature value in the second sub-range;

[0026] After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes:

[0027] After the air conditioner has been running for a preset third time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0028] The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

[0029] In one embodiment, the step of updating the opening degree according to the difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value includes:

[0030] When the superheat degree is greater than or equal to the superheat degree threshold, updating the opening degree according to a preset first adjustment coefficient and the difference;

[0031] When the superheat degree is less than the superheat degree threshold, the opening degree is updated according to a preset second adjustment coefficient and the difference.

[0032] In one embodiment, the first temperature range is determined by the outdoor temperature.

[0033] To achieve the above-mentioned objectives, the present invention also provides a multi-split air-conditioning system, which includes a memory, a processor, and a multi-split air-conditioning system heat dissipation control program stored in the memory and executable on the processor. When the multi-split air-conditioning system heat dissipation control program is executed by the processor, the various steps of the multi-split air-conditioning system heat dissipation control method described above are implemented.

[0034] To achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, which stores a multi-split air-conditioning system heat dissipation control program. When the multi-split air-conditioning system heat dissipation control program is executed by a processor, the various steps of the multi-split air-conditioning system heat dissipation control method described above are implemented.

[0035] The present invention provides a multi-split air conditioning system, a heat dissipation control method thereof, and a computer-readable storage medium. In the full heat recovery mode of the multi-split air conditioning system, the current temperature of the compressor drive module is detected; when the current temperature falls within a first temperature range, the opening of the main expansion valve and the speed of the outdoor unit fan are determined; the four-way valve is controlled to be powered on, and the operation of the multi-split air conditioning system is controlled according to the opening and speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation. In the full heat recovery mode, the refrigerant amount is adjusted by adjusting the opening of the main expansion valve, and the precise refrigerant flow rate is matched to the different heat dissipation loads of the drive module. The refrigerant heat dissipation effect is adjusted by adjusting the speed of the outdoor fan, so that the drive module can effectively dissipate heat while making the multi-split system more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the hardware structure of the multi-split air conditioning system involved in an embodiment of the present invention;

[0037] Figure 2 This is a flow chart of a first embodiment of a heat dissipation control method for a multi-split air conditioning system according to the present invention;

[0038] Figure 3 It is a structural schematic diagram of the multi-split air conditioning system of the present invention;

[0039] Figure 4 This is a flow chart of a second embodiment of the heat dissipation control method for a multi-split air conditioning system according to the present invention;

[0040] Figure 5 1 is a flow chart of a third embodiment of a heat dissipation control method for a multi-split air conditioning system according to the present invention;

[0041] Figure 6 1 is a flow chart of a fourth embodiment of a heat dissipation control method for a multi-split air conditioning system according to the present invention;

[0042] Figure 7 1 is a flow chart of a fifth embodiment of a heat dissipation control method for a multi-split air conditioning system according to the present invention;

[0043] Figure 8 1 is a flow chart of a sixth embodiment of a heat dissipation control method for a multi-split air conditioning system according to the present invention;

[0044] Figure 9 4 is a flow chart of a seventh embodiment of a heat dissipation control method for a multi-split air conditioning system according to the present invention.

[0045] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] The main solution of the embodiment of the present invention is: in the full heat recovery mode of the multi-split air-conditioning system, the current temperature of the compressor drive module is detected; when the current temperature belongs to the first temperature range, the opening of the main expansion valve and the speed of the outdoor unit fan are determined; the four-way valve is controlled to be powered on, and the operation of the multi-split air-conditioning system is controlled according to the opening and speed, so that the refrigerant is cooled through the outdoor heat exchanger and the refrigerant heat dissipation module.

[0048] In full heat recovery mode, the refrigerant volume is adjusted by adjusting the opening of the main expansion valve, accurately matching the refrigerant flow to the different heat dissipation loads of the drive module, and adjusting the refrigerant heat dissipation effect by adjusting the speed of the outdoor fan. This allows the drive module to effectively dissipate heat while making the multi-split system more energy-efficient.

[0049] As an implementation solution, the multi-split air conditioning system can be Figure 1 shown.

[0050] The embodiment of the present invention relates to a multi-split air conditioning system, which includes a processor 101, such as a CPU, a memory 102, and a communication bus 103. The communication bus 103 is used to achieve connection and communication between these components.

[0051] The memory 102 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Figure 1 As shown, the memory 102 as a computer-readable storage medium may include a multi-split air conditioning system heat dissipation control program; and the processor 101 may be used to call the multi-split air conditioning system heat dissipation control program stored in the memory 102 and perform the following operations:

[0052] In the full heat recovery mode of the multi-split air conditioning system, detecting the current temperature of the compressor drive module;

[0053] When the current temperature falls within the first temperature range, determining the opening of the main expansion valve and the speed of the outdoor unit fan;

[0054] The four-way valve is controlled to be powered on, and the multi-connected air-conditioning system is controlled to operate according to the opening and the speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0055] In one embodiment, the processor 101 may be configured to call a heat dissipation control program for a multi-split air conditioning system stored in the memory 102 and perform the following operations:

[0056] When the current temperature falls within a second temperature range, determining that the main expansion valve is at its maximum opening and the outdoor fan is at its maximum speed, and the minimum temperature value in the second temperature range is greater than the maximum temperature value in the first temperature range;

[0057] The four-way valve is controlled to be powered off, and the multi-connected air-conditioning system is controlled to operate according to the maximum opening and the maximum speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0058] In one embodiment, the processor 101 may be configured to call a heat dissipation control program for a multi-split air conditioning system stored in the memory 102 and perform the following operations:

[0059] When the current temperature falls within the third temperature range, the four-way valve is powered on, the main expansion valve and the outdoor fan are closed, and the maximum temperature value in the third temperature range is less than the minimum temperature value in the first temperature range.

[0060] In one embodiment, the processor 101 may be configured to call a heat dissipation control program for a multi-split air conditioning system stored in the memory 102 and perform the following operations:

[0061] When the current temperature belongs to a first sub-range in a first temperature range, determining that the rotation speed is zero and determining that the opening is a first opening value;

[0062] After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes:

[0063] After a preset first time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0064] The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

[0065] In one embodiment, the processor 101 may be configured to call a heat dissipation control program for a multi-split air conditioning system stored in the memory 102 and perform the following operations:

[0066] When the current temperature belongs to a second sub-range within the first temperature range, determining the speed to be a first speed value, determining the opening to be a second opening value, the second opening value being greater than the first opening value, and the minimum temperature value in the second sub-range being greater than the maximum temperature value in the first sub-range;

[0067] After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes:

[0068] After the air conditioner has been running for a preset second time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0069] The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

[0070] In one embodiment, the processor 101 may be configured to call a heat dissipation control program for a multi-split air conditioning system stored in the memory 102 and perform the following operations:

[0071] When the current temperature falls within a third sub-range of the current temperature range, determining the speed to be a second speed value, determining the opening of the main expansion valve to be a third opening value, the second speed value is greater than the first speed value, the third opening value is greater than the second opening value, and the minimum temperature value in the third sub-range is greater than the maximum temperature value in the second sub-range;

[0072] After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes:

[0073] After the air conditioner has been running for a preset third time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0074] The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

[0075] In one embodiment, the processor 101 may be configured to call a heat dissipation control program for a multi-split air conditioning system stored in the memory 102 and perform the following operations:

[0076] When the superheat degree is greater than or equal to the superheat degree threshold, updating the opening degree according to a preset first adjustment coefficient and the difference;

[0077] When the superheat degree is less than the superheat degree threshold, the opening degree is updated according to a preset second adjustment coefficient and the difference.

[0078] Based on the hardware architecture of the multi-split air conditioning system, an embodiment of the heat dissipation control method of the multi-split air conditioning system of the present invention is proposed.

[0079] Reference Figure 2 , Figure 2 This is a first embodiment of the heat dissipation control method for a multi-split air conditioning system of the present invention, and the heat dissipation control method for a multi-split air conditioning system comprises the following steps:

[0080] Step S10 : In the full heat recovery mode of the multi-split air conditioning system, detecting the current temperature of the compressor drive module.

[0081] Specifically, such as Figure 3 As shown, the multi-split air conditioning system includes multiple indoor units 40 and outdoor units 100. The indoor units 40 and outdoor units 100 are connected via liquid pipes 60, high- and low-pressure pipes 30, and gas pipes 50. The indoor units 40 are connected to the liquid pipes 60, high- and low-pressure pipes 30, and gas pipes 50 via valve boxes 41. The liquid pipes 60 of the multi-split air conditioning system are also equipped with a subcooler 70, a refrigerant heat dissipation module 80, a main expansion valve 90, and the outdoor units 100. The multi-split air conditioning system is equipped with a four-way valve 20, which is respectively connected to the indoor units 40, the compressor 10, and the outdoor units 100. The four-way valve 20 is connected to the indoor units 40 via the high- and low-pressure pipes 30 or the gas pipe 50, and is connected to the outdoor units 100 via the liquid pipe 60.

[0082] In the full heat recovery mode, the load of the indoor unit in heating mode and the indoor unit in cooling mode in the multi-split air-conditioning system are equivalent. The refrigerant condenses from the compressor through the high and low pressure pipes in the indoor unit in heating mode, and then throttles and evaporates in the indoor unit in cooling mode, and finally returns to the compressor through the gas pipe to complete the cycle. In the full heat recovery mode, the main expansion valve of the outdoor unit is closed, and the refrigerant in the liquid pipe section and the heat exchanger of the outdoor unit do not participate in the circulation of the multi-split air-conditioning system.

[0083] Therefore, the compressor driver module can function normally in full cooling mode, full heating mode, primary cooling mode, or primary heating mode, using refrigerant heat dissipation. However, in full heat recovery mode, since the outdoor unit's heat exchanger is not involved in the multi-split air conditioning system's circulation and the refrigerant does not flow through the heat dissipation module, effective heat dissipation is impossible. Especially under high loads, the driver module's temperature can rise sharply, potentially causing the compressor to limit or reduce frequency, or even damage the driver module.

[0084] In the full heat recovery mode of the multi-split air conditioning system, the current temperature of the compressor drive module is detected, and the heat dissipation method is determined according to the current temperature of the drive module. Optionally, the drive module is a variable frequency drive module.

[0085] Step S20: When the current temperature falls within the first temperature range, determining the opening of the main expansion valve and the rotation speed of the outdoor unit fan.

[0086] Specifically, when the current temperature falls within the first temperature range, it indicates that the current temperature of the driver module is high and the driver module needs to be cooled. Optionally, the first temperature range is (T1, T4], where T1 is the first temperature threshold, T4 is the fourth temperature threshold, and optionally, T4<100.

[0087] When the current temperature falls within the first temperature range, the opening of the main expansion valve and the speed of the outdoor fan are determined. Optionally, as the current temperature increases, the opening of the main expansion valve increases and the speed of the outdoor fan increases, thereby improving the heat dissipation effect of the driver module. Optionally, as the current temperature decreases, the opening of the main expansion valve decreases and the speed of the outdoor fan decreases, thereby saving energy consumption of the air conditioning system.

[0088] Step S30 , controlling the four-way valve to be powered on, and controlling the operation of the multi-split air-conditioning system according to the opening and the speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0089] Specifically, after the control four-way valve of the multi-split air conditioning system is powered on, a first proportion of refrigerant in the multi-split air conditioning system flows through the following paths: the compressor, high- and low-pressure pipes, the valve box of the cooling indoor unit, the cooling indoor unit, the valve box of the heating indoor unit, the heating outdoor unit, the gas pipe, and the compressor. A second proportion of refrigerant in the multi-split air conditioning system flows through the following paths: the compressor, high- and low-pressure pipes, the valve box of the cooling indoor unit, the valve box of the heating indoor unit, the heating outdoor unit, the liquid pipe, the refrigerant heat dissipation module, the main expansion valve, the outdoor fan, the capillary tube of the four-way valve, the four-way valve, and finally back to the compressor. Optionally, the first proportion is greater than the second proportion.

[0090] At this time, the second proportion of refrigerant dissipates heat through the refrigerant heat dissipation module, or dissipates heat through the refrigerant heat dissipation module and the outdoor heat exchanger, thereby reducing the refrigerant temperature and further reducing the temperature of the driving module.

[0091] The four-way valve is controlled to power on and operate the multi-split air conditioning system based on the opening and speed, allowing the refrigerant to dissipate heat through the outdoor heat exchanger and the refrigerant cooling module. The main expansion valve opening determines the proportion or amount of refrigerant entering the liquid pipe for heat dissipation. A wider opening increases the proportion or amount of refrigerant entering the liquid pipe, while a smaller opening decreases the proportion or amount of refrigerant entering the liquid pipe. The outdoor fan speed determines the rate at which the refrigerant dissipates heat in the outdoor heat exchanger. A higher outdoor unit speed increases the refrigerant dissipation rate, while a lower outdoor unit speed decreases the refrigerant dissipation rate.

[0092] In the technical solution of this embodiment, in the full heat recovery mode, the refrigerant amount is adjusted by adjusting the opening of the main expansion valve, the precise refrigerant flow is matched to the different heat dissipation loads of the drive module, and the refrigerant heat dissipation effect is adjusted by adjusting the speed of the outdoor fan, so that the drive module can effectively dissipate heat while making the multi-split system more energy-efficient.

[0093] Reference Figure 4 , Figure 4 This is a second embodiment of the heat dissipation control method for a multi-split air conditioning system of the present invention. Based on the first embodiment, after step S10, the method further includes:

[0094] Step S40: When the current temperature falls within the second temperature range, determining that the main expansion valve is at its maximum opening and the outdoor fan is at its maximum speed, and the minimum temperature value in the second temperature range is greater than the maximum temperature value in the first temperature range;

[0095] In step S50 , the four-way valve is controlled to be powered off, and the multi-split air-conditioning system is controlled to operate according to the maximum opening and the maximum speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0096] Specifically, when the current temperature falls within the second temperature range, it indicates that the current temperature of the driver module is very high and the driver module urgently needs to be cooled. The minimum temperature value in the second temperature range is greater than the maximum temperature value in the first temperature range. Optionally, the second temperature range is when the current temperature is greater than a fourth temperature threshold value T4.

[0097] After the control valve of a multi-split air conditioning system loses power, the refrigerant in the third ratio in the multi-split air conditioning system flows as follows: compressor, high- and low-pressure pipes, valve box of the cooling indoor unit, cooling indoor unit, valve box of the heating indoor unit, heating outdoor unit, gas pipe, compressor. The refrigerant in the fourth ratio in the multi-split air conditioning system flows as follows: compressor, high- and low-pressure pipes, valve box of the cooling indoor unit, cooling indoor unit, valve box of the heating indoor unit, heating outdoor unit, liquid pipe, refrigerant heat dissipation module, main expansion valve, outdoor fan, four-way valve, and finally back to the compressor. Optionally, the third ratio is less than the first ratio, and the fourth ratio is greater than the second ratio, meaning that the amount of refrigerant entering the outdoor unit for heat dissipation increases.

[0098] At this time, the refrigerant in the fourth proportion dissipates heat through the refrigerant heat dissipation module and the outdoor heat exchanger, thereby reducing the temperature of the refrigerant and further reducing the temperature of the driving module.

[0099] When the current temperature falls within a first temperature range, the main expansion valve is determined to be at its maximum opening and the outdoor fan is determined to be at its maximum speed. When the main expansion valve is at its maximum opening and the outdoor fan is at its maximum speed, the heat dissipation effect of the drive module is excellent. The four-way valve is controlled to be powered off, and the multi-split air conditioning system is controlled to operate according to the maximum opening and the maximum speed, so that the refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation.

[0100] In the technical solution of this embodiment, in the full heat recovery mode, a larger refrigerant flow rate is matched to the larger heat dissipation load of the driving module, and the refrigerant heat dissipation effect is adjusted by adjusting the speed of the outdoor fan, so that the driving module can effectively dissipate heat to ensure the normal operation of the driving module.

[0101] Reference Figure 5 , Figure 5This is a third embodiment of the heat dissipation control method for a multi-split air conditioning system of the present invention, based on the first or second embodiment, and after step S10, further comprising:

[0102] Step S60: When the current temperature falls within the third temperature range, the four-way valve is powered on, the main expansion valve and the outdoor fan are both closed, and the maximum temperature value in the third temperature range is less than the minimum temperature value in the first temperature range.

[0103] Specifically, when the current temperature falls within the third temperature range, it indicates that the current temperature of the driver module is relatively low and the heat dissipation requirement for the driver module is relatively low. Optionally, the third temperature range is when the current temperature is less than or equal to the first temperature threshold T1.

[0104] Since the main expansion valve is closed, the refrigerant in the multi-split air-conditioning system flows as follows: compressor, high and low pressure pipes, valve box of the refrigeration indoor unit, refrigeration indoor unit, valve box of the heating indoor unit, heating outdoor unit, gas pipe, and finally back to the compressor.

[0105] In the technical solution of this embodiment, in the full heat recovery mode, the drive module does not need to dissipate heat through refrigerant under the condition of a relatively small heat dissipation load, making the multi-split system more energy-efficient.

[0106] Reference Figure 6 , Figure 6 This is a fourth embodiment of the heat dissipation control method for a multi-split air conditioning system of the present invention, based on any one of the first to third embodiments, wherein step S20 includes:

[0107] Step S21, when the current temperature belongs to a first sub-range in a first temperature range, determining that the rotation speed is zero and the opening is a first opening value;

[0108] After step S30, the method further includes:

[0109] Step S70, after a preset first time period, updating the opening degree according to the difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0110] Step S80: Control the operation of the multi-split air-conditioning system according to the rotation speed and the updated opening degree.

[0111] Specifically, the current temperature belongs to the first sub-range of the first temperature range, where the first sub-range is (T1, T2], where T1 is the first temperature threshold, T2 is the second temperature threshold, and T2 is less than the fourth temperature threshold T4. At this time, the current temperature of the driver module is relatively high, and the driver module needs to be cooled. Therefore, the speed of the outdoor fan is determined to be zero, and the opening of the main expansion valve is determined to be the first opening value X1, where the first opening value X1 is associated with the first sub-range.

[0112] The four-way valve is controlled to be powered on, and the operation of the multi-split air conditioning system is controlled according to the first opening value X1 of the main expansion valve. After a preset first duration a, optionally, the preset first duration is in the range (0, 10 minutes), the multi-split air conditioning system enters the automatic control mode. The opening is updated according to the difference between the superheat of the outdoor heat exchanger and a preset superheat threshold. Optionally, when the superheat is greater than or equal to the superheat threshold, the opening is updated according to the preset first adjustment coefficient and the difference; illustratively, as shown in the following formula:

[0113] When Ts≥Ts1, X=X'+k1(Ts-Ts1), 0<k1<5;

[0114] Wherein, Ts represents superheat, Ts1 represents superheat threshold, X represents the current opening of the main expansion valve, X' represents the opening of the main expansion valve in the previous control cycle of the automatic control mode, K1 is the first adjustment coefficient, and optionally, the superheat threshold 0<Ts1<5.

[0115] When the superheat degree is less than the superheat degree threshold, the opening degree is updated according to the preset second adjustment coefficient and the difference. For example, as shown in the following formula:

[0116] When Ts<Ts1, X=X'+k2(Ts-Ts1), 0<k2<10;

[0117] Wherein, Ts represents superheat, Ts1 represents superheat threshold, X represents the current opening of the main expansion valve, X' represents the opening of the main expansion valve in the previous control cycle of the automatic control mode, K2 is the second adjustment coefficient, and optionally, the superheat threshold 0<Ts1<5.

[0118] In the technical solution of this embodiment, in the full heat recovery mode, the refrigerant amount is adjusted by adjusting the opening of the main expansion valve, and the precise refrigerant flow is matched to the different heat dissipation loads of the drive module. The opening of the main expansion valve is automatically updated according to the superheat after a preset period of time, and the refrigerant flow is further adjusted to make the multi-split system more energy-efficient; the refrigerant heat dissipation effect is adjusted by adjusting the speed of the outdoor fan, so that the drive module can effectively dissipate heat at the same time.

[0119] Reference Figure 7 , Figure 7 This is a fifth embodiment of the heat dissipation control method for a multi-split air conditioning system of the present invention, based on any one of the first to fourth embodiments, wherein step S20 includes:

[0120] Step S22: when the current temperature falls within a second sub-range within the first temperature range, determining the speed to be a first speed value, determining the opening to be a second opening value, the second opening value being greater than the first opening value, and the minimum temperature value within the second sub-range being greater than the maximum temperature value within the first sub-range;

[0121] After step S30, the method further includes:

[0122] Step S90, after the air conditioner has been running for a preset second time period, updating the opening degree according to the difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0123] Step S100: Control the operation of the multi-split air-conditioning system according to the rotation speed and the updated opening degree.

[0124] Specifically, the current temperature belongs to the second sub-range of the first temperature range, wherein the second sub-range is (T2, T3], wherein T2 is the second temperature threshold, T3 is the third temperature threshold, T2 is greater than the first temperature threshold T1, and T3 is less than the fourth temperature threshold T4. At this time, the current temperature of the driving module is relatively high, and the driving module needs to be cooled. Therefore, the speed of the outdoor fan is determined to be the first speed value N1, and the opening of the main expansion valve is determined to be the second opening value X2. The first speed value N1 and the second opening value X2 are associated with the second sub-range, and the second opening value N2 is greater than the first opening value N1.

[0125] The four-way valve is controlled to be powered on, and the operation of the multi-split air conditioning system is controlled according to the first speed value N1 of the outdoor fan and the second opening value X2 of the main expansion valve. After a preset second time duration b, optionally wherein the preset second time duration is within the range (0, 10 minutes), the multi-split air conditioning system enters an automatic control mode, and the opening is updated according to the difference between the superheat of the outdoor heat exchanger and a preset superheat threshold. Optionally, when the superheat is greater than or equal to the superheat threshold, the opening is updated according to the preset first adjustment coefficient and the difference; illustratively, as shown in the following formula:

[0126] When Ts≥Ts1, X=X'+k1(Ts-Ts1), 0<k1<5;

[0127] Wherein, Ts represents superheat, Ts1 represents superheat threshold, X represents the current opening of the main expansion valve, X' represents the opening of the main expansion valve in the previous control cycle of the automatic control mode, K1 is the first adjustment coefficient, and optionally, the superheat threshold 0<Ts1<5.

[0128] When the superheat degree is less than the superheat degree threshold, the opening degree is updated according to the preset second adjustment coefficient and the difference. For example, as shown in the following formula:

[0129] When Ts<Ts1, X=X'+k2(Ts-Ts1), 0<k2<10;

[0130] Wherein, Ts represents superheat, Ts1 represents superheat threshold, X represents the current opening of the main expansion valve, X' represents the opening of the main expansion valve in the previous control cycle of the automatic control mode, K2 is the second adjustment coefficient, and optionally, the superheat threshold 0<Ts1<5.

[0131] In the technical solution of this embodiment, in the full heat recovery mode, the refrigerant amount is adjusted by adjusting the opening of the main expansion valve, and the precise refrigerant flow is matched to the different heat dissipation loads of the drive module. The opening of the main expansion valve is automatically updated according to the superheat after a preset period of time, and the refrigerant flow is further adjusted to make the multi-split system more energy-efficient; the refrigerant heat dissipation effect is adjusted by adjusting the speed of the outdoor fan, so that the drive module can effectively dissipate heat at the same time.

[0132] Reference Figure 8 , Figure 8 This is a sixth embodiment of the heat dissipation control method for a multi-split air conditioning system of the present invention, based on any one of the first to fifth embodiments, wherein step S20 includes:

[0133] Step S23: When the current temperature falls within a third sub-range of the current temperature range, determining the speed to be a second speed value, determining the opening of the main expansion valve to be a third opening value, the second speed value being greater than the first speed value, the third opening value being greater than the second opening value, and the minimum temperature value in the third sub-range being greater than the maximum temperature value in the second sub-range;

[0134] After step S30, the method further includes:

[0135] Step S110, after the air conditioner has been running for a preset third time period, updating the opening degree according to the difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value;

[0136] Step S120: Control the operation of the multi-split air-conditioning system according to the rotation speed and the updated opening degree.

[0137] Specifically, the current temperature belongs to the third sub-range of the first temperature range, wherein the second sub-range is (T3, T4], wherein T3 is the third temperature threshold, T4 is the fourth temperature threshold, and T3 is greater than the second temperature threshold T2. At this time, the current temperature of the driving module is relatively high, and the driving module needs to be cooled. Therefore, the speed of the outdoor fan is determined to be the second speed value N2, and the opening of the main expansion valve is determined to be the third opening value X3. The second speed value N2 and the third opening value X3 are associated with the third sub-range, the second speed value N2 is greater than the first speed value N1, and the third opening value X3 is greater than the second opening value X2.

[0138] The four-way valve is controlled to be powered on, and the operation of the multi-split air conditioning system is controlled according to the second speed value N2 of the outdoor fan and the third opening value X3 of the main expansion valve. After a preset third time duration c, optionally wherein the preset third time duration is within the range (0, 10 minutes), the multi-split air conditioning system enters an automatic control mode, and the opening is updated according to the difference between the superheat of the outdoor heat exchanger and a preset superheat threshold. Optionally, when the superheat is greater than or equal to the superheat threshold, the opening is updated according to a preset first adjustment coefficient and the difference; illustratively, as shown in the following formula:

[0139] When Ts≥Ts1, X=X'+k1(Ts-Ts1), 0<k1<5;

[0140] Wherein, Ts represents superheat, Ts1 represents superheat threshold, X represents the current opening of the main expansion valve, X' represents the opening of the main expansion valve in the previous control cycle of the automatic control mode, K1 is the first adjustment coefficient, and optionally, the superheat threshold 0<Ts1<5.

[0141] When the superheat degree is less than the superheat degree threshold, the opening degree is updated according to the preset second adjustment coefficient and the difference. For example, as shown in the following formula:

[0142] When Ts<Ts1, X=X'+k2(Ts-Ts1), 0<k2<10;

[0143] Wherein, Ts represents superheat, Ts1 represents superheat threshold, X represents the current opening of the main expansion valve, X' represents the opening of the main expansion valve in the previous control cycle of the automatic control mode, K2 is the second adjustment coefficient, and optionally, the superheat threshold 0<Ts1<5.

[0144] In the technical solution of this embodiment, in the full heat recovery mode, the refrigerant amount is adjusted by adjusting the opening of the main expansion valve, and the precise refrigerant flow is matched to the different heat dissipation loads of the drive module. The opening of the main expansion valve is automatically updated according to the superheat after a preset period of time, and the refrigerant flow is further adjusted to make the multi-split system more energy-efficient; the refrigerant heat dissipation effect is adjusted by adjusting the speed of the outdoor fan, so that the drive module can effectively dissipate heat at the same time.

[0145] Reference Figure 9 , Figure 9This is the seventh embodiment of the heat dissipation control method for a multi-split air conditioning system according to the present invention. The seventh embodiment is based on any one of the first to sixth embodiments. The current temperature of the drive module is T. When T ≤ T1, the four-way valve is energized, the main expansion valve is closed, and the outdoor fan is turned off. When T1 < T ≤ T2, the four-way valve is energized, the main expansion valve is opened to a preset first opening X1, the outdoor fan is turned off, and after a preset first operating time a, the main expansion valve enters an automatic control mode. When T2 < T ≤ T3, the four-way valve is energized, the main expansion valve is opened to a preset second opening X2, the outdoor fan is started, and maintained at a preset first speed N1. After a preset second operating time b, the main expansion valve enters an automatic control mode. When T3 < T ≤ T4, the four-way valve is energized, the main expansion valve is opened to a preset third opening X3, the outdoor fan is started, and maintained at a preset second speed N2. After a third operating time c, the main expansion valve enters an automatic control mode. When T4 < T, the four-way valve loses power, the main expansion valve opens to its maximum opening, and the outdoor fan is adjusted to its maximum speed. Among them, 0 < T1 < T2 < T3 < T4 < 100; X1 < X2 < X3; N1 < N2.

[0146] The current ambient temperature is obtained, where T1-T4, X1-X3, and N1-N2 vary for different ambient temperatures. Optionally, the first temperature threshold T1, the second temperature threshold T2, the third temperature threshold T3, and the fourth temperature threshold T4 may be adjusted upward as the ambient temperature increases. Optionally, the first opening value X1, the second opening value X2, and the third opening value X3 of the main expansion valve may be adjusted upward as the ambient temperature increases to facilitate subsequent automatic control. Optionally, the first speed value N1 and the second speed value N2 of the outdoor fan may be adjusted downward as the ambient temperature increases to make the air conditioning system more energy-efficient.

[0147] The present invention also provides a multi-split air-conditioning system, which includes a memory, a processor, and a multi-split air-conditioning system heat dissipation control program stored in the memory and executable on the processor. When the multi-split air-conditioning system heat dissipation control program is executed by the processor, the various steps of the multi-split air-conditioning system heat dissipation control method described in the above embodiment are implemented.

[0148] The present invention also provides a computer-readable storage medium, which stores a multi-split air-conditioning system heat dissipation control program. When the multi-split air-conditioning system heat dissipation control program is executed by a processor, it implements the various steps of the multi-split air-conditioning system heat dissipation control method described in the above embodiment.

[0149] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0150] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, system, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, system, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, system, article, or device comprising the element.

[0151] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment system can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the existing technology, can be embodied in the form of a software product. The computer software product is stored in a computer-readable storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, parking management equipment, air conditioner, or network equipment, etc.) to execute the system described in each embodiment of the present invention.

[0152] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A heat dissipation control method for a multi-split air conditioning system, characterized in that: The multi-split air conditioning system is provided with a four-way valve and a main expansion valve, the four-way valve is connected to the indoor unit, the compressor and the outdoor unit respectively, the main expansion valve is arranged on the outdoor unit side, the indoor unit and the outdoor unit are connected by a liquid pipe, a high and low pressure pipe and a gas pipe respectively, the liquid pipe is provided with a subcooler, a refrigerant heat dissipation module and the main expansion valve, one end of the refrigerant heat dissipation module is connected to the outdoor unit through the main expansion valve, and the heat dissipation control method of the multi-split air conditioning system includes: In a full heat recovery mode of the multi-split air conditioning system, detecting a current temperature of a drive module of the compressor, wherein in the full heat recovery mode, the main expansion valve is closed, and the refrigerant in the liquid pipe section and the heat exchanger of the outdoor unit do not participate in the refrigerant circulation of the multi-split air conditioning system; When the current temperature falls within a first temperature range, determining the opening of the main expansion valve and the speed of the outdoor unit fan, wherein the first temperature range is determined by the outdoor temperature, wherein the higher the current temperature, the larger the opening of the main expansion valve, and the faster the speed of the outdoor unit fan; the lower the current temperature, the smaller the opening of the main expansion valve, and the smaller the speed of the outdoor unit fan; the opening of the main expansion valve determines the proportion of refrigerant entering the liquid pipe for heat dissipation, wherein the larger the opening, the greater the proportion of refrigerant entering the liquid pipe, and the smaller the opening, the smaller the proportion of refrigerant entering the liquid pipe; Controlling the four-way valve to be powered on, and controlling the operation of the multi-split air conditioning system according to the opening and the speed, so that the second proportion of refrigerant passes through the outdoor heat exchanger and the refrigerant heat dissipation module for heat dissipation; When the current temperature falls within a second temperature range, determining that the main expansion valve is at its maximum opening and the outdoor unit fan is at its maximum speed, and the minimum temperature value in the second temperature range is greater than the maximum temperature value in the first temperature range; Controlling the four-way valve to be powered off, and controlling the multi-split air conditioning system to operate according to the maximum opening and the maximum speed, so that a fourth proportion of refrigerant is dissipated through the outdoor heat exchanger and the refrigerant heat dissipation module, wherein the fourth proportion is greater than the second proportion; When the current temperature falls within the third temperature range, the four-way valve is powered on, the main expansion valve and the outdoor fan are both closed, and the maximum temperature value in the third temperature range is less than the minimum temperature value in the first temperature range.

2. The heat dissipation control method of a multi-split air conditioning system according to claim 1, wherein: When the current temperature falls within the first temperature range, the step of determining the opening of the main expansion valve and the rotational speed of the outdoor unit fan comprises: When the current temperature belongs to a first sub-range in a first temperature range, determining that the rotation speed is zero and determining that the opening is a first opening value; After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes: After a preset first time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value; The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

3. The heat dissipation control method of a multi-split air conditioning system according to claim 2, wherein: When the current temperature falls within the first temperature range, the step of determining the opening of the main expansion valve and the rotational speed of the outdoor unit fan comprises: When the current temperature belongs to a second sub-range within the first temperature range, determining the speed to be a first speed value, determining the opening to be a second opening value, the second opening value being greater than the first opening value, and the minimum temperature value in the second sub-range being greater than the maximum temperature value in the first sub-range; After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes: After the air conditioner has been running for a preset second time period, updating the opening degree according to the difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value; The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

4. The heat dissipation control method of a multi-split air conditioning system according to claim 3, wherein: When the current temperature falls within the first temperature range, the step of determining the opening of the main expansion valve and the rotational speed of the outdoor unit fan comprises: When the current temperature falls within a third sub-range of the current temperature range, determining the speed to be a second speed value, determining the opening of the main expansion valve to be a third opening value, the second speed value is greater than the first speed value, the third opening value is greater than the second opening value, and the minimum temperature value in the third sub-range is greater than the maximum temperature value in the second sub-range; After the step of controlling the four-way valve to be powered on and controlling the operation of the multi-split air conditioning system according to the opening and the speed, the method further includes: After the air conditioner has been running for a preset third time period, updating the opening degree according to a difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value; The operation of the multi-split air-conditioning system is controlled according to the rotation speed and the updated opening degree.

5. The heat dissipation control method for a multi-split air conditioning system according to any one of claims 2 to 4, characterized in that: The step of updating the opening degree according to the difference between the superheat degree of the outdoor heat exchanger and a preset superheat degree threshold value includes: When the superheat degree is greater than or equal to the superheat degree threshold, updating the opening degree according to a preset first adjustment coefficient and the difference; When the superheat degree is less than the superheat degree threshold, the opening degree is updated according to a preset second adjustment coefficient and the difference.

6. A multi-split air conditioning system, characterized in that: The multi-split air-conditioning system includes a memory, a processor, and a multi-split air-conditioning system heat dissipation control program stored in the memory and executable on the processor. When the multi-split air-conditioning system heat dissipation control program is executed by the processor, the various steps of the multi-split air-conditioning system heat dissipation control method as described in any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a heat dissipation control program for a multi-split air-conditioning system. When the heat dissipation control program for the multi-split air-conditioning system is executed by a processor, each step of the heat dissipation control method for a multi-split air-conditioning system is implemented.

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