Heating control method and system of air-cooled multi-split air conditioning system and storage medium

Abstract

The invention provides a heating control method and system of an air-cooled multi-split air conditioner system and a storage medium. The heating control method of the air-cooled multi-split air-conditioning system comprises the following steps: detecting operation parameters of the air-cooled multi-split air-conditioning system; judging whether the operation parameters meet a first preset condition or not; and if yes, the pipeline switching device is controlled to be switched into the first state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger flows into the supercooling pipe, heat exchange is conducted on the refrigerant through the supercooling pipe, and the gaseous refrigerant is further liquefied. According to the scheme, the refrigerant circulation amount of the system can be increased, particularly the refrigerant circulation amount under the low-temperature heating condition is increased, and the overall energy efficiency of the system is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a heating control method, system and storage medium for an air-cooled multi-split system. Background Art

[0002] With the development of society and the continuous improvement of people's living standards, various air conditioning devices have become one of the indispensable electrical devices in people's daily lives. Various air conditioning devices can help people achieve a comfortable temperature and humidity when the ambient temperature and humidity are too high or too low. Current air conditioning devices mainly include various types of air conditioners and fans.

[0003] The air-cooled multi-split system consists of one outdoor unit and multiple indoor units connected in parallel. When the air-cooled multi-split system operates in cooling mode, the outdoor heat exchanger acts as the system's condenser, while the indoor heat exchanger acts as the system's evaporator. The indoor units' supply and return air circulation provides cooling to the indoor environment, lowering the indoor temperature and making users feel cooler. When the air-cooled multi-split system operates in heating mode, the outdoor heat exchanger acts as the system's evaporator, while the indoor heat exchanger acts as the system's condenser. The indoor units' supply and return air circulation provides heat to the indoor environment, raising the indoor temperature and making users feel warmer.

[0004] Air-cooled VRF systems enable independent control of multiple rooms and flexible interoperability, making them increasingly popular. However, current systems suffer from the following issues: insufficient refrigerant during operation can lead to poor cooling and heating performance. This is particularly true for low-temperature heating, where outdoor evaporation conditions are limited, causing most of the refrigerant to accumulate at the bottom of the gas-liquid separator, resulting in insufficient refrigerant circulation and poor heating performance.

[0005] To increase refrigerant circulation during low-temperature heating, current air-cooled multi-split systems typically employ either a jet-assisted reheat compressor or a heating element at the bottom of the gas-liquid separator. However, the use of a jet-assisted reheat compressor significantly increases operating and maintenance costs, consumes significant energy, and generates considerable noise, which not only impacts operator health but also causes noise pollution to the environment. While adding a heating element at the bottom of the gas-liquid separator can increase the liquid refrigerant temperature and overall refrigerant circulation, it also increases electricity consumption, resulting in energy waste. Summary of the Invention

[0006] One purpose of the present invention is to increase the refrigerant circulation volume under low-temperature heating conditions and improve the overall energy efficiency of the system.

[0007] A further object of the present invention is to utilize the heat that should have been dissipated to preheat the bottom of the gas-liquid separator, thereby effectively saving energy and reducing operating costs.

[0008] In particular, the present invention provides a heating control method for an air-cooled multi-split system, wherein the air-cooled multi-split system includes: an indoor heat exchanger, a subcooling pipe and a pipe switching device, and the method includes: detecting the operating parameters of the air-cooled multi-split system; judging whether the operating parameters meet a first preset condition; and if so, controlling the pipe switching device to switch to a first state, so that the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger flows into the subcooling pipe, and the refrigerant is subjected to heat exchange using the subcooling pipe, so that the gaseous refrigerant is further liquefied.

[0009] Optionally, the step of detecting the operating parameters of the air-cooled multi-split system includes: detecting the outdoor ambient temperature of the air-cooled multi-split system, the low pressure of the compressor's suction port, the exhaust temperature, the air inlet pipe temperature and the liquid inlet pipe temperature of the indoor unit.

[0010] Optionally, the step of determining whether the operating parameters meet the first preset conditions includes: determining whether the outdoor ambient temperature is lower than the first preset temperature, the low pressure at the suction port of the compressor is lower than the first preset pressure and lasts for a duration greater than the first preset duration, the exhaust temperature is greater than or equal to the second preset temperature, and the difference between the intake pipe temperature and the liquid inlet pipe temperature is greater than or equal to the third preset temperature.

[0011] Optionally, the indoor heat exchanger is configured to condense and liquefy the gaseous refrigerant to release heat; and the air-cooled multi-split system also includes: an outdoor heat exchanger, configured to vaporize the liquid refrigerant to absorb heat from the outdoor environment; and a gas-liquid separator, connected to the outdoor heat exchanger, configured to separate the refrigerant flowing out of the outdoor heat exchanger into gas and liquid, and the subcooling pipe is arranged at the bottom of the gas-liquid separator.

[0012] Optionally, the air-cooled multi-split system also includes: an indoor throttling device, connected to the indoor heat exchanger, configured to adjust the flow rate of the refrigerant and fully open, and when the pipeline switching device is switched to the first state, the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger flows through the indoor throttling device and then flows into the subcooling pipe; and an outdoor throttling device, connected to the outdoor heat exchanger, configured to adjust the flow rate of the refrigerant and partially open, and when the pipeline switching device is switched to the first state, the refrigerant that has exchanged heat in the subcooling pipe flows through the outdoor throttling device and then flows into the outdoor heat exchanger.

[0013] Optionally, before the step of detecting the operating parameters of the air-cooled multi-split system, the step also includes: receiving a trigger signal for the air-cooled multi-split system to start the heating mode; controlling the pipeline switching device to switch to the second state, so that the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger flows through the indoor throttling device and then flows into the outdoor throttling device; and controlling the air-cooled multi-split system to complete a defrosting process.

[0014] Optionally, when the operating parameters do not meet the first preset condition, the control pipeline switching device remains in the second state.

[0015] Optionally, after the step of switching the control line switching device to the first state, the method further includes: determining whether the operating parameters meet the second preset condition; and if so, executing the step of switching the control line switching device to the second state; if not, maintaining the control line switching device in the first state.

[0016] Optionally, the step of determining whether the operating parameters meet the second preset conditions includes: determining whether the outdoor ambient temperature is greater than or equal to a fourth preset temperature, the low pressure is greater than the second preset pressure and the duration is greater than the second preset duration, and the difference between the air inlet pipe temperature and the liquid inlet pipe temperature is less than or equal to the fifth preset temperature.

[0017] Optionally, the pipeline switching device includes: a first solenoid valve and a second solenoid valve, and the first solenoid valve is arranged between the supercooling pipe and the outdoor throttling device, and the second solenoid valve is arranged between the indoor throttling device and the outdoor throttling device.

[0018] Optionally, the step of controlling the pipeline switching device to switch to the first state includes: controlling the first solenoid valve to open and the second solenoid valve to close; the step of controlling the pipeline switching device to switch to the second state includes: controlling the first solenoid valve to close and the second solenoid valve to open.

[0019] According to another aspect of the present invention, an air conditioner is provided, comprising: a controller, the controller comprising a memory and a processor, wherein the memory stores a machine executable program, and when the machine executable program is executed by the processor, any of the above-mentioned air conditioner control methods is implemented.

[0020] According to another aspect of the present invention, a machine-readable storage medium is provided, on which a machine-executable program is stored. When the machine-executable program is executed by a processor, any of the above-mentioned air conditioner control methods is implemented.

[0021] The heating control method, system and storage medium of the air-cooled multi-split system of the present invention detect the operating parameters of the air-cooled multi-split system; determine whether the operating parameters meet the first preset condition; and if so, control the pipeline switching device to switch to the first state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger flows into the subcooling pipe, and uses the subcooling pipe to exchange heat with the refrigerant, so that the gas refrigerant is further liquefied, which can increase the refrigerant circulation volume of the system, especially increase the refrigerant circulation volume under low-temperature heating conditions, and effectively improve the overall energy efficiency of the system.

[0022] Furthermore, the heating control method, system and storage medium of the air-cooled multi-split system of the present invention receive a trigger signal for the air-cooled multi-split system to start the heating mode; control the pipeline switching device to switch to the second state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger flows through the indoor throttling device and then flows into the outdoor throttling device; control the air-cooled multi-split system to complete a defrosting process, and when the operating parameters of the air-cooled multi-split system meet the first preset conditions, control the pipeline switching device to switch to the first state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger flows into the supercooling pipe, and the refrigerant is heat-exchanged by the supercooling pipe, so that the gaseous refrigerant is further liquefied; when the operating parameters meet the second preset conditions, control the pipeline switching device to switch to the second state, and adjust the pipeline switching device according to actual conditions to make the flow path of the refrigerant reasonable, increase the refrigerant circulation volume of the system, and use the heat that should have been dissipated to preheat the bottom of the gas-liquid separator, effectively save energy, avoid additional replacement, addition of equipment or consumption of electricity, and greatly reduce operating costs.

[0023] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0025] Figure 1 is a connection diagram of an air-cooled multi-split system according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of a heating control method for an air-cooled multi-split system according to an embodiment of the present invention;

[0027] Figure 3 is a detailed flow chart of a heating control method for an air-cooled multi-split system according to an embodiment of the present invention;

[0028] Figure 4 is a schematic block diagram of a controller of an air-cooled multi-split system according to an embodiment of the present invention; and

[0029] Figure 5 is a schematic diagram of a machine-readable storage medium according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Figure 1 FIG. 1 is a connection diagram of an air-cooled multi-split system 100 according to an embodiment of the present invention. Figure 1 As shown, the air-cooled multi-split system 100 of this embodiment can generally include: an indoor heat exchanger 106, a subcooling pipe 113 and a pipeline switching device. Among them, when the air-cooled multi-split system 100 operates in the heating mode, the indoor heat exchanger 106 can be configured to condense and liquefy the gas refrigerant to release heat. The pipeline switching device can be configured to switch to a first state when the operating parameters of the air-cooled multi-split system 100 meet the first preset conditions, so that the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows into the subcooling pipe 113. The subcooling pipe 113 can be configured to perform heat exchange on the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger 106, so that the gas refrigerant is further liquefied.

[0031] In a specific embodiment, Figure 1 As shown, the air-cooled multi-split system 100 may further include: an outdoor heat exchanger 112 and a gas-liquid separator 117. The outdoor heat exchanger 112 may be configured to vaporize the liquid refrigerant to absorb heat from the outdoor environment. The gas-liquid separator 117 may be connected to the outdoor heat exchanger 112 and configured to separate the refrigerant flowing out of the outdoor heat exchanger 112 into gas and liquid. In addition, a subcooling pipe 113 is provided at the bottom of the gas-liquid separator 117. The subcooling pipe 113 is provided at the bottom of the gas-liquid separator 117, so that the refrigerant further liquefied by the subcooling pipe 113 can flow into the outdoor heat exchanger 112 as soon as possible, thereby avoiding premature evaporation and affecting the refrigerant circulation volume of the entire machine.

[0032] As mentioned earlier, current air-cooled VRF systems suffer from the following issues: insufficient refrigerant during operation can lead to poor cooling and heating performance. This is especially true for low-temperature heating, where limited outdoor evaporation conditions cause most of the refrigerant to accumulate at the bottom of the gas-liquid separator, resulting in insufficient refrigerant circulation and poor heating performance.

[0033] To increase refrigerant circulation during low-temperature heating, current air-cooled multi-split systems typically employ either a jet-assisted reheat compressor or a heating element at the bottom of the gas-liquid separator. However, the use of a jet-assisted reheat compressor significantly increases operating and maintenance costs, consumes significant energy, and generates considerable noise, which not only impacts operator health but also causes noise pollution to the environment. While adding a heating element at the bottom of the gas-liquid separator can increase the liquid refrigerant temperature and overall refrigerant circulation, it also increases electricity consumption, resulting in energy waste.

[0034] The air-cooled multi-split system 100 of this embodiment, by providing a subcooling pipe 113 at the bottom of the gas-liquid separator 117, can increase the system's refrigerant circulation capacity, particularly during low-temperature heating. Furthermore, the heat that would otherwise be dissipated can be used to preheat the bottom of the gas-liquid separator 117, effectively saving energy and avoiding the need for additional equipment or electricity consumption, significantly reducing operating costs.

[0035] like Figure 1 As shown, the air-cooled multi-split system 100 may further include an indoor throttling device 107 connected to the indoor heat exchanger 106, configured to regulate the flow of the refrigerant and fully open. Furthermore, when the pipeline switching device is switched to the first state, the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows through the indoor throttling device 107 and then into the subcooling pipe 113.

[0036] Air-cooled multi-split system 100 may further include an outdoor throttling device 114 connected to outdoor heat exchanger 112, configured to regulate the flow of refrigerant and partially open. Furthermore, when the pipeline switching device is switched to the first state, the refrigerant, having exchanged heat in subcooling pipe 113, flows through outdoor throttling device 114 and then into outdoor heat exchanger 112.

[0037] That is, when the air-cooled multi-split system 100 operates in heating mode, the indoor throttling device 107 is fully open, and the outdoor throttling device 114 is partially open. When the air-cooled multi-split system 100 operates in cooling mode, the opposite is true: the indoor throttling device 107 is partially open, and the outdoor throttling device 114 is fully open. Both the indoor throttling device 107 and the outdoor throttling device 114 can throttle and reduce pressure.

[0038] In a preferred embodiment, both the indoor throttling device 107 and the outdoor throttling device 114 are electronic expansion valves. These electronic expansion valves, as electronic regulating valves, achieve throttling and pressure reduction by controlling the refrigerant flow rate. They operate by controlling the opening and closing of a magnetic valve via an electronic signal, thereby changing the aperture of the expansion valve and regulating the refrigerant flow rate.

[0039] By controlling the flow of refrigerant through the electronic expansion valve, the air-cooled multi-split system 100 can be operated in a more efficient manner. Compared with the traditional mechanical expansion valve, the electronic expansion valve has higher precision in controlling the flow of refrigerant; faster response speed; and is more energy-saving, because it can achieve more precise flow control, thereby achieving higher energy utilization efficiency.

[0040] In a specific embodiment, the pipeline switching device can also be configured to switch to the second state when the operating parameters of the air-cooled multi-split system 100 do not meet the first preset condition, so that the gas-liquid mixed state refrigerant flowing out of the indoor heat exchanger 106 flows into the outdoor throttling device 114 after flowing through the indoor throttling device 107.

[0041] As shown in Figure 1 , the pipeline switching device can include a first electromagnetic valve 110 and a second electromagnetic valve 119. The first electromagnetic valve 110 is arranged between the supercooling pipe 113 and the outdoor throttling device 114, and the second electromagnetic valve 119 is arranged between the indoor throttling device 107 and the outdoor throttling device 114. The pipeline switching device can also be configured such that the first electromagnetic valve 110 is opened and the second electromagnetic valve 119 is closed when switched to the first state, and the first electromagnetic valve 110 is closed and the second electromagnetic valve 119 is opened when switched to the second state. When the electromagnetic valve is opened, the pipeline connected thereto is connected; when the electromagnetic valve is closed, the pipeline connected thereto is disconnected. The opening and closing states of the first electromagnetic valve 110 and the second electromagnetic valve 119 cooperate to enable the refrigerant to flow through different paths when the pipeline switching device is in the first state and the second state.

[0042] As shown in Figure 1 , the air-cooled multi-split system 100 can also include a compressor 101 and an oil separator 103. The compressor 101 can be configured to pressurize the gaseous refrigerant to become a high-temperature and high-pressure gas. In a preferred embodiment, the compressor 101 can be a variable frequency compressor. Compared with a compressor with constant speed, a variable frequency compressor can continuously adjust its speed within a certain range through a specific control method, and can continuously change its output energy.

[0043] The variable frequency compressor has the following advantages: compared with the traditional constant frequency compressor, the variable frequency compressor has lower energy consumption, because it can automatically adjust the compression ratio according to the actual needs of the air compressor to achieve higher efficiency, thereby reducing the energy consumption of the entire system, and ultimately achieving the purpose of energy saving and emission reduction; the variable frequency compressor also has higher efficiency, and its motor-driven mode can automatically adjust the speed according to the actual needs to ensure that the optimal efficiency can be maintained under different working loads.

[0044] And, since the variable frequency compressor can automatically adjust the speed, it ensures that the machine can be in the best working condition under different working loads, so it can prolong the service life of the compressor; in addition, since the speed of the variable frequency compressor is generally low, it can also reduce the wear and failure rate of the machine and improve the reliability of the equipment; the traditional compressor produces a lot of noise when running, and the variable frequency compressor can reduce the noise of the compressor by automatically controlling the speed, improve the working environment and improve the working efficiency.

[0045] The oil separator 103 can be configured to separate the lubricating oil in the high-temperature and high-pressure gas discharged by the compressor 101. Generally, the oil separator 103 can separate the oil particles in the high-pressure steam under the action of gravity according to the oil separation principle of reducing airflow speed and changing airflow direction. The oil separator 103 separates the lubricating oil in the refrigerant, which can ensure the safe and efficient operation of the system.

[0046] As shown in Figure 1 The air-cooled multi-split system 100 can also include a gas pipe stop valve 108, a liquid pipe stop valve 105, and a four-way valve 104. The gas pipe stop valve 108 can be connected to the indoor heat exchanger 106. The liquid pipe stop valve 105 can be connected to the indoor throttling device 107. The four-way valve 104 can be configured to controllably communicate the oil separator 103 and the gas pipe stop valve 108, or the outdoor heat exchanger 112 and the gas-liquid separator 117. Specifically, when the refrigerant flows out of the compressor 101, the four-way valve 104 can communicate the oil separator 103 and the gas pipe stop valve 108. When the refrigerant flows back to the compressor 101, the four-way valve 104 can communicate the outdoor heat exchanger 112 and the gas-liquid separator 117.

[0047] Regardless of whether the pipe switching device is in the first state or the second state, eventually the refrigerant flows back to the compressor 101 through the gas-liquid separator 117 first, and the gas-liquid separation is performed through the gas-liquid separator 117, and the gaseous refrigerant flows into the compressor 101. The gas-liquid separator 117 can be regarded as a device for protecting the compressor 101 on the suction flow process, which can separate the gas and liquid of the refrigerant, prevent the low-pressure and low-temperature wet steam from carrying too much liquid droplets when returning to the compressor 101, and avoid the liquid refrigerant entering the compressor 101 to cause liquid hammer failure.

[0048] In addition, as shown in Figure 1 The air-cooled multi-split system 100 can also be provided with other small components, such as a high-pressure pressure sensor 102, a return air temperature sensor 109, pipe temperature sensors 116, 120, and 121, which can be configured to detect the pressure and temperature at the location, respectively. In addition, Figure 1 The return air pipe 111 is also shown in

[0049] This embodiment provides a heating control method for an air-cooled multi-split system, which can increase the refrigerant circulation volume of the system, especially the refrigerant circulation volume under low-temperature heating conditions, and effectively improve the overall energy efficiency of the system. Figure 2 FIG is a schematic diagram of a heating control method for an air-cooled multi-split system according to an embodiment of the present invention. Figure 2 As shown, the heating control method of the air-cooled multi-split system may include the following steps:

[0050] Step S202, detecting the operating parameters of the air-cooled multi-split system 100;

[0051] Step S204, determining whether the operating parameters meet the first preset condition, if so, executing step S206;

[0052] In step S206, the pipeline switching device is controlled to switch to the first state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows into the subcooling pipe 113, and the refrigerant is heat-exchanged by the subcooling pipe 113, so that the gas refrigerant is further liquefied.

[0053] It should be noted that the air-cooled multi-split system 100 in the heating control method of the air-cooled multi-split system of this embodiment includes: an indoor heat exchanger 106, a subcooling pipe 113 and a pipe switching device. Specifically, the heating control method of the air-cooled multi-split system of this embodiment can be applied to the aforementioned embodiment. Figure 1 Furthermore, since this embodiment is a heating control method for an air-cooled multi-split system, the above steps are performed when the air-cooled multi-split system 100 operates in a heating mode.

[0054] In the above steps, step S202 detects the operating parameters of the air-cooled multi-split system 100. Specifically, the outdoor ambient temperature of the air-cooled multi-split system 100, the low pressure at the air inlet of the compressor 101, the exhaust temperature, and the air inlet pipe temperature and liquid inlet pipe temperature of the indoor unit can be detected. Step S204 determines whether the operating parameters meet a first preset condition. Specifically, it can determine whether the outdoor ambient temperature is less than the first preset temperature, the low pressure at the air inlet of the compressor 101 is less than the first preset pressure and has lasted for a period greater than the first preset time, the exhaust temperature is greater than or equal to the second preset temperature, and the difference between the air inlet pipe temperature and the liquid inlet pipe temperature is greater than or equal to the third preset temperature.

[0055] If the judgment result of step S204 is yes, that is, in the case that the outdoor ambient temperature is less than the first preset temperature, the low-pressure pressure of the suction port of the compressor 101 is less than the first preset pressure and the duration is greater than the first preset duration, the discharge temperature is greater than or equal to the second preset temperature, and the difference between the inlet pipe temperature and the liquid inlet pipe temperature is greater than or equal to the third preset temperature, step S206 can be performed to control the pipeline switching device to switch to the first state to make the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flow into the subcooling pipe 113, and the subcooling pipe 113 is used to exchange heat with the refrigerant to further liquefy the gaseous refrigerant.

[0056] That is, when the air-cooled multi-split system 100 operates in the heating mode, the indoor heat exchanger 106 acts as a condenser of the system, can condense and liquefy the gaseous refrigerant to release heat, and improve the temperature of the indoor environment to make the user feel warm. However, the condensation and liquefaction of the refrigerant by the indoor heat exchanger 106 can not be sufficient, and the refrigerant flowing out of the indoor heat exchanger 106 can be in a gas-liquid mixed state.

[0057] If the operating parameters of the air-cooled multi-split system 100 meet the first preset condition, the pipeline switching device can be switched to the first state to make the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flow into the subcooling pipe 113, and the subcooling pipe 113 is used to exchange heat with the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106, which can further liquefy the gaseous refrigerant and make the refrigerant flow to the next component in the form of liquid as much as possible. In this way, the refrigerant circulation amount of the system can be improved, and the overall energy efficiency of the system can be effectively improved. The first preset condition can be a low-temperature heating condition, that is, the heating control method of the air-cooled multi-split system of the embodiment can especially improve the refrigerant circulation amount in the low-temperature heating condition.

[0058] In summary, the heating control method of the air-cooled multi-split system of the embodiment can detect the operating parameters of the air-cooled multi-split system 100, judge whether the operating parameters meet the first preset condition, and if yes, control the pipeline switching device to switch to the first state to make the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flow into the subcooling pipe 113, and the subcooling pipe 113 is used to exchange heat with the refrigerant to further liquefy the gaseous refrigerant, which can improve the refrigerant circulation amount of the system, especially the refrigerant circulation amount in the low-temperature heating condition, and effectively improve the overall energy efficiency of the system.

[0059] In some optional embodiments, the air-cooled multi-split system 100 can achieve higher technical effects by further optimizing and configuring the above steps. The following describes in detail the heating control method of the air-cooled multi-split system of this embodiment in combination with an introduction to an optional execution process of this embodiment. This embodiment is only an example of the execution process. During specific implementation, the execution order and operating conditions of some steps can be modified according to specific implementation requirements. Figure 3 Detailed flow chart of a heating control method for an air-cooled multi-split system according to an embodiment of the present invention. The heating control method for an air-cooled multi-split system includes the following steps:

[0060] Step S302, receiving a trigger signal for the air-cooled multi-split system 100 to start a heating mode;

[0061] Step S304: Control the pipeline switching device to switch to the second state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows through the indoor throttling device 107 and then flows into the outdoor throttling device 114;

[0062] Step S306, controlling the air-cooled multi-split system 100 to complete a defrosting process;

[0063] Step S308, detecting the operating parameters of the air-cooled multi-split system 100;

[0064] Step S310, determining whether Tao < T1, Ps < P1, t > t1, Td ≥ T2, and TC1 - TC2 ≥ T3, if so, executing step S314, if not, executing step S312;

[0065] Step S312, controlling the pipeline switching device to remain in the second state;

[0066] Step S314: Control the pipeline switching device to switch to the first state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows into the subcooling pipe 113, and the refrigerant is heat-exchanged by the subcooling pipe 113, so that the gas refrigerant is further liquefied;

[0067] Step S316, determine whether Tao ≥ T4, Ps > P2 and t > t2, and TC1 - TC2 ≤ T5, if so, execute step S304, if not, execute step S318;

[0068] Step S318: Control the pipeline switching device to remain in the first state.

[0069] Similarly, the heating control method of the air-cooled multi-split system of this embodiment can also be applied to the aforementioned embodiment. Figure 1In the above steps, step S302 receives a trigger signal for the air-cooled multi-split system 100 to start the heating mode, that is, the above steps of this embodiment are performed when the air-cooled multi-split system 100 operates in the heating mode.

[0070] After receiving a trigger signal in step S302 to activate the heating mode of the air-cooled multi-split system 100, step S304 can be executed to control the pipeline switching device to switch to the second state, so that the gas-liquid mixed refrigerant flowing out of the indoor heat exchanger 106 flows through the indoor throttling device 107 and then into the outdoor throttling device 114. In other words, after receiving the trigger signal, the air-cooled multi-split system 100 can be controlled according to normal heating conditions. When the pipeline switching device is switched to the second state, the refrigerant flow path is suitable for normal heating conditions, without the need to increase the refrigerant circulation volume of the system.

[0071] Furthermore, it is necessary to first execute step S306 to control the air-cooled multi-split system 100 to complete a defrosting process, and then execute subsequent steps to further determine whether the state of the pipeline switching device needs to be switched. This ensures that the air-cooled multi-split system 100 has been operating in a normal heating state for a period of time and is in a relatively stable state. Defrost is also more conducive to subsequently improving heat exchange efficiency and reducing the burden on the compressor 101. Especially for low-temperature heating, when the pipeline switching device is switched to the first state, it is even more necessary to reduce the burden on the compressor 101 to avoid damage to the compressor 101 and extend its service life.

[0072] Specifically, after completing a defrost cycle, step S308 can be performed to detect the operating parameters of the air-cooled multi-split system 100. These operating parameters may include: the outdoor ambient temperature Tao of the air-cooled multi-split system 100, the low-pressure pressure Ps at the suction port of the compressor 101, the exhaust temperature Td, and the indoor unit's air inlet pipe temperature TC1 and liquid inlet pipe temperature TC2. These operating parameters can be detected a certain period of time after the air-cooled multi-split system 100 enters normal heating operation. For example, the average of the data at the 10th and 15th minutes can be used to ensure that the detected operating parameters are relatively accurate and reflect the actual operation of the air-cooled multi-split system 100.

[0073] Then, step S310 is executed to determine whether Tao < T1, Ps < P1, t > t1, Td ≥ T2, and TC1 - TC2 ≥ T3. If the result of step S310 is negative, step S312 is executed to control the pipeline switching device to remain in the second state. In practice, the first preset conditions are: the outdoor ambient temperature Tao is less than the first preset temperature T1, the low pressure Ps at the intake port of the compressor 101 is less than the first preset pressure P1 and the duration t is greater than the first preset duration t1, the exhaust temperature Td is greater than or equal to the second preset temperature T2, and the difference between the intake pipe temperature TC1 and the liquid inlet pipe temperature TC2 is greater than or equal to the third preset temperature T3.

[0074] Step S310 determines whether the operating parameters meet the first preset condition. As mentioned above, the first preset condition can be low-temperature heating. If the operating parameters of the air-cooled multi-split system 100 do not meet the first preset condition, it can be considered normal heating, not low-temperature heating. If normal heating is the case, step S312 is executed, and the control pipeline switching device remains in the second state. This means that the gas-liquid mixed refrigerant flowing out of the indoor heat exchanger 106 continues to flow through the indoor throttling device 107 and then into the outdoor throttling device 114.

[0075] If the result of step S310 is yes, that is, the operating parameters meet the first preset conditions, step S314 is executed to control the pipeline switching device to switch to the first state, so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows into the subcooling pipe 113, and the refrigerant is heat exchanged by using the subcooling pipe 113, so that the gas refrigerant is further liquefied.

[0076] Specifically, if the operating parameters satisfy the first preset condition, it indicates that, in the low-temperature heating mode, the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows through the indoor throttling device 107 and then flows into the subcooling pipe 113. The refrigerant, having exchanged heat in the subcooling pipe 113, then flows into the outdoor throttling device 114. Whether the refrigerant flowing out of the indoor throttling device 107 flows directly into the outdoor throttling device 114 or first flows through the cooling pipe 113 for heat exchange before flowing into the outdoor throttling device 114 is the primary difference between normal heating and low-temperature heating. Whether the operation is normal heating or low-temperature heating depends on whether the operating parameters of the air-cooled multi-split system 100 satisfy the first preset condition.

[0077] After the pipeline switching device is switched to the first state in step S314, step S316 may be executed to determine whether Tao ≥ T4, Ps > P2, t > t2, and TC1 - TC2 ≤ T5. If the determination result in step S316 is yes, step S304 is executed to switch the pipeline switching device to the second state. In practice, the second preset condition is: the outdoor ambient temperature Tao is greater than or equal to a fourth preset temperature T4, the low pressure Ps is greater than the second preset pressure P2 for a duration t greater than the second preset duration t2, and the difference between the intake pipe temperature TC1 and the liquid inlet pipe temperature TC2 is less than or equal to a fifth preset temperature T5.

[0078] Step S316 determines whether the operating parameters meet the second preset condition. If so, step S304 is executed to control the pipeline switching device to switch to the second state. In other words, once the pipeline switching device switches to the first state in step S314, exiting that state, i.e., switching to the second state, requires that the operating parameters meet the second preset condition.

[0079] If the result of step S316 is negative, step S318 is executed to control the pipeline switching device to remain in the first state. That is, after the pipeline switching device switches to the first state in step S314, if the operating parameters do not meet the second preset condition, the pipeline switching device will not switch to the first state, but will instead be controlled to remain in the first state. Step S316 can determine whether the operating parameters meet the second preset condition at regular intervals, for example, every 10 minutes.

[0080] Furthermore, the first preset condition is as follows: the outdoor ambient temperature Tao is less than the first preset temperature T1; the low pressure Ps at the intake port of the compressor 101 is less than the first preset pressure P1 and lasts for a duration t greater than the first preset duration t1; the exhaust temperature Td is greater than or equal to the second preset temperature T2; and the difference between the intake pipe temperature TC1 and the liquid inlet pipe temperature TC2 is greater than or equal to the third preset temperature T3. If all of the above conditions are met, the first preset condition is considered satisfied. If any one of these conditions is not met, the first preset condition is considered not satisfied.

[0081] In a specific embodiment, the first preset temperature may be -5°C, the first preset pressure may be 3 Bar, the first preset duration may be 30 minutes, the second preset temperature may be 80°C, and the third preset temperature may be 40°C. It should be noted that the specific values ​​of the above preset parameters are merely examples and are not limitations of the present invention. In other embodiments, other values ​​may be set according to actual conditions, but they must generally reflect the current low-temperature heating situation.

[0082] In a preferred embodiment, Figure 1As shown, a low-pressure pressure sensor 118 can be provided at the air intake of the compressor 101, configured to detect the low-pressure pressure at the air intake of the compressor 101 and to record the duration for which the low-pressure pressure remains below a first preset pressure. Furthermore, an external temperature sensor can be provided on the outdoor unit of the air-cooled multi-split system 100 to detect the outdoor ambient temperature. An exhaust temperature sensor can be provided on the top of the compressor 101 to detect the exhaust temperature. An intake air temperature sensor and a liquid inlet temperature sensor can be provided on the air intake pipe and liquid inlet pipe of the indoor unit, respectively, to detect the intake pipe temperature and the liquid inlet pipe temperature, respectively.

[0083] Similarly, the second preset condition is as follows: the outdoor ambient temperature Tao is greater than or equal to the fourth preset temperature T4, the low pressure Ps is greater than the second preset pressure P2 and the duration t is greater than the second preset duration t2, and the difference between the air inlet pipe temperature TC1 and the liquid inlet pipe temperature TC2 is less than or equal to the fifth preset temperature T5. If all of the above conditions are met, the second preset condition is considered met. If any one of them is not met, the second preset condition is considered not met.

[0084] In a specific embodiment, the fourth preset temperature may be 0°C, the second preset pressure may be 4 Bar, the second preset duration may be 10 minutes, and the fifth preset temperature may be 30°C. It should be noted that the specific values ​​of the above preset parameters are merely examples and are not limitations of the present invention. In other embodiments, other values ​​may be set according to actual conditions, but they must generally reflect that the current situation is no longer low-temperature heating.

[0085] It should be emphasized that when the pipeline switching device is switched to the first state, the refrigerant flows in sequence through the compressor 101, oil separator 103, four-way valve 104, gas pipe stop valve 108, indoor heat exchanger 106, indoor throttling device 107, liquid pipe stop valve 105, subcooling pipe 113, first solenoid valve 110, outdoor throttling device 114, outdoor heat exchanger 112, four-way valve 104, gas-liquid separator 117, and compressor 101. In other words, in the case of low-temperature heating, the refrigerant flows according to the above path.

[0086] When the pipeline switching device is switched to the second state, the refrigerant flows in sequence through the compressor 101, the oil separator 103, the four-way valve 104, the gas pipe stop valve 108, the indoor heat exchanger 106, the indoor throttling device 107, the liquid pipe stop valve 105, the second solenoid valve 119, the outdoor throttling device 114, the outdoor heat exchanger 112, the four-way valve 104, the gas-liquid separator 117, and the compressor 101. That is, under normal heating conditions, the refrigerant flows according to the above-mentioned path.

[0087] In summary, the heating control method of the air-cooled multi-split system of this embodiment receives a trigger signal for the air-cooled multi-split system 100 to start the heating mode; controls the pipeline switching device to switch to the second state so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger 106 flows through the indoor throttling device 107 and then flows into the outdoor throttling device 114; controls the air-cooled multi-split system 100 to complete a defrosting process, and when the operating parameters of the air-cooled multi-split system 100 meet the first preset condition, controls the pipeline switching device to switch to the first ... into the outdoor throttling device 114; controls the air-cooled multi-split system 100 to complete a defrosting process, and when the operating parameters of the air-cooled multi-split system 100 meet the first preset condition, controls the pipeline switching device 6 The refrigerant in the gas-liquid mixed state that flows out flows into the subcooling pipe 113, and the subcooling pipe 113 is used to exchange heat with the refrigerant, so that the gas refrigerant is further liquefied. When the operating parameters meet the second preset conditions, the pipeline switching device is controlled to switch to the second state. The pipeline switching device is adjusted according to actual conditions to make the flow path of the refrigerant reasonable, increase the refrigerant circulation volume of the system, and use the heat that should have been dissipated to preheat the bottom of the gas-liquid separator 117, effectively saving energy, avoiding additional replacement, addition of equipment or consumption of electricity, and greatly reducing operating costs.

[0088] It should be noted that the heating control method for an air-cooled multi-split system of this embodiment is primarily applicable to the case where the air-cooled multi-split system 100 operates in heating mode. When the air-cooled multi-split system 100 operates in cooling mode, the heating control method for an air-cooled multi-split system of this embodiment can be referred to, and the relevant steps can be adjusted. The refrigerant flow path can be similarly adjusted to similarly increase the refrigerant circulation volume of the system and improve the overall energy efficiency of the system.

[0089] In addition, the air-cooled multi-split system 100 may include a controller 300 . Figure 4 FIG. 3 is a schematic block diagram of a controller 300 of an air-cooled multi-split system according to an embodiment of the present invention. Figure 4 As shown, the controller 300 may include: a processor 310 and a memory 320, wherein the memory 320 stores a machine executable program 321, which is used to implement any of the above-mentioned heating control methods of the air-cooled multi-split system when executed by the processor 310.

[0090] The processor 310 can be a central processing unit (CPU), a digital processing unit, or the like. The processor 310 sends and receives data via a communication interface. The memory 320 is used to store a machine-executable program 321 executed by the processor 310. The memory 320 is any medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, and can also be a combination of multiple memories 320. The machine-executable program 321 can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded and installed to the controller 300 via a network (e.g., the Internet, a local area network, a wide area network, and / or a wireless network).

[0091] The air-cooled multi-split system 100 in this embodiment can increase the refrigerant circulation volume of the system by setting a subcooling pipe 113, especially increase the refrigerant circulation volume under low-temperature heating conditions, and effectively improve the overall energy efficiency of the system; it can use the heat that should have been dissipated to preheat the bottom of the gas-liquid separator 117, effectively saving energy, avoiding additional replacement, addition of equipment or consumption of electricity, and greatly reducing operating costs.

[0092] This embodiment also provides a machine-readable storage medium 400, Figure 5 3 is a schematic diagram of a machine-readable storage medium 400 according to an embodiment of the present invention, wherein the machine-readable storage medium 400 stores a machine executable program 321, which, when executed by the processor 310, implements the heating control method of the air-cooled multi-split system of any of the above embodiments.

[0093] The machine-readable storage medium 400 of this embodiment can be an electronic memory such as a flash memory, an EEPROM (Electrically Erasable Programmable Read-Only Memory), an EPROM, a hard disk, or a ROM. The machine-readable storage medium 400 has storage space for a machine-executable program 321 for executing any of the method steps described above. These machine-executable programs 321 can be read from or written to one or more computer program products. These computer program products include program code carriers such as a hard disk, a compact disk (CD), a memory card, or a floppy disk. When the device containing the machine-readable storage medium 400 runs the machine-executable program 321, each step of the method described above can be executed.

[0094] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0095] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A heating control method for an air-cooled multi-split system, wherein the air-cooled multi-split system comprises: An indoor heat exchanger, a subcooling pipe and a pipe switching device, and the method includes: Detecting the operating parameters of the air-cooled multi-split system; Determining whether the operating parameters meet a first preset condition; and If so, the pipeline switching device is controlled to switch to the first state so that the refrigerant in the gas-liquid mixed state flowing out of the indoor heat exchanger flows into the subcooling pipe, and the refrigerant is heat exchanged by the subcooling pipe to further liquefy the gas refrigerant.

2. The method according to claim 1, wherein the step of detecting the operating parameters of the air-cooled multi-split system comprises: The outdoor ambient temperature of the air-cooled multi-split system, the low pressure at the air inlet of the compressor, the exhaust temperature, the air inlet pipe temperature and the liquid inlet pipe temperature of the indoor unit are detected.

3. The method according to claim 2, wherein the step of determining whether the operating parameter meets the first preset condition comprises: Determine whether the outdoor ambient temperature is lower than the first preset temperature, the low pressure at the suction port of the compressor is lower than the first preset pressure and lasts for a duration greater than the first preset duration, the exhaust temperature is greater than or equal to the second preset temperature, and the difference between the intake pipe temperature and the liquid inlet pipe temperature is greater than or equal to the third preset temperature.

4. The method according to claim 2, wherein: The indoor heat exchanger is configured to: condense and liquefy the gaseous refrigerant to release heat; and The air-cooled multi-split system also includes: an outdoor heat exchanger, configured to vaporize the liquid refrigerant to absorb heat from the outdoor environment; and a gas-liquid separator, connected to the outdoor heat exchanger, configured to separate the refrigerant flowing out of the outdoor heat exchanger into gas and liquid, and the subcooling pipe is arranged at the bottom of the gas-liquid separator.

5. The method according to claim 4, wherein The air-cooled multi-split system also includes: an indoor throttling device, connected to the indoor heat exchanger, configured to adjust the flow rate of the refrigerant and be fully opened, when the pipeline switching device is switched to the first state, the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger flows through the indoor throttling device and then flows into the subcooling pipe; and an outdoor throttling device, connected to the outdoor heat exchanger, configured to adjust the flow rate of the refrigerant and be partially opened, when the pipeline switching device is switched to the first state, the refrigerant that has exchanged heat in the subcooling pipe flows through the outdoor throttling device and then flows into the outdoor heat exchanger.

6. The method according to claim 5, wherein before the step of detecting the operating parameters of the air-cooled multi-split system, the method further comprises: Receiving a trigger signal for the air-cooled multi-split system to start a heating mode; Controlling the pipeline switching device to switch to a second state so that the refrigerant in a gas-liquid mixed state flowing out of the indoor heat exchanger flows through the indoor throttling device and then flows into the outdoor throttling device; as well as The air-cooled multi-connected system is controlled to complete a defrosting process.

7. The method according to claim 6, wherein: When the operating parameter does not satisfy the first preset condition, the pipeline switching device is controlled to remain in the second state.

8. The method according to claim 6, further comprising: Determining whether the operating parameters meet a second preset condition; as well as If yes, execute the step of controlling the pipeline switching device to switch to the second state, If not, control the pipeline switching device to maintain the first state.

9. The method according to claim 8, wherein the step of determining whether the operating parameter satisfies a second preset condition comprises: Determine whether the outdoor ambient temperature is greater than or equal to a fourth preset temperature, the low pressure is greater than a second preset pressure and lasts for a duration greater than the second preset duration, and the difference between the air inlet pipe temperature and the liquid inlet pipe temperature is less than or equal to a fifth preset temperature.

10. The method according to claim 8, wherein The pipeline switching device includes: a first solenoid valve and a second solenoid valve, and the first solenoid valve is arranged between the supercooling pipe and the outdoor throttling device, and the second solenoid valve is arranged between the indoor throttling device and the outdoor throttling device.

11. The method according to claim 10, wherein: The step of controlling the pipeline switching device to switch to the first state includes: controlling the first solenoid valve to open and the second solenoid valve to close; The step of controlling the pipeline switching device to switch to the second state includes: controlling the first solenoid valve to close and the second solenoid valve to open.

12. An air-cooled multi-split system comprising: A controller comprising a memory and a processor, wherein the memory stores a machine executable program, and when the machine executable program is executed by the processor, the heating control method of the air-cooled multi-split system according to any one of claims 1 to 11 is implemented.

13. A machine-readable storage medium having a machine-executable program stored thereon, wherein when the machine-executable program is executed by a processor, the heating control method for an air-cooled multi-split system according to any one of claims 1 to 11 is implemented.

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