Control method and device, medium, electronic equipment, outdoor unit and air conditioning system

Abstract

The invention provides a control method and device, a medium, electronic equipment, an outdoor unit and an air conditioning system.The control method comprises the following steps that when the outdoor unit runs in a heating mode and receives an operation command that a user turns off part of indoor units or turns down the air gear, the outdoor environment temperature T < outer ring > is obtained; when the obtained outdoor environment temperature Touter ring is larger than or equal to the preset heating pressure relief outer ring temperature T1, it is judged that pressure relief judgment control needs to be conducted; otherwise, judging that the system does not need pressure relief treatment and runs normally; when the outdoor unit operates in the refrigeration mode, the outdoor environment temperature Touter ring is obtained; when the obtained outdoor environment temperature Touter ring is smaller than or equal to the preset low-temperature starting environment temperature T2, it is judged that the outdoor temperature is low, and low-temperature starting preheating is conducted; otherwise, judging that the outdoor temperature is relatively high, and performing normal operation. The method is used for air supply control or pressure relief control under the refrigerating and heating conditions, stable and reliable operation of the system is ensured, and the low-temperature operation reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method, device, medium, electronic equipment, outdoor unit and air conditioning system. Background Art

[0002] For a free-distribution multi-connection system, in order to ensure that the compressor can meet the capacity requirements under full load conditions, a compressor with a larger displacement will be selected. In this case, when the starting capacity is small, due to the large displacement of the compressor, even if the compressor is running at the lowest frequency, the problem of excessive pressure will occur. This situation is particularly obvious when a single small-capacity indoor unit is running at a low wind speed.

[0003] Some existing models solve this problem by adding an unloading bypass valve between the compressor exhaust port and the air intake port to release the pressure. However, since the unloading valve can only control whether to unload, and cannot adjust the unloading amount, the unloading valve must be opened and closed frequently under certain conditions, resulting in unstable system operation.

[0004] In order to solve this problem, a control method for an air conditioner is disclosed in the prior art, which replaces the conventional unloading valve with an electronic expansion valve. By adjusting the opening of the electronic expansion valve, the bypass flow adjustment range of the air conditioner is large and the bypass flow is reasonable. A bypass electronic expansion valve flow path is directly added to the compressor suction and exhaust ports, and the high and low pressure sides of the system at both ends of the electronic expansion valve are fixed; for the free-matching multi-split type, since the system operates at a low frequency during refrigeration operation, there will be no problem of excessive system pressure, and there is no need to relieve pressure at this time. The electronic expansion valve loses its function during refrigeration operation. There is a waste of function and cost. Summary of the invention

[0005] The object of the present invention is to provide a control method, device, medium, electronic equipment, outdoor unit and air conditioning system to solve the technical problems of functional waste and cost waste in the electronic expansion valve pressure relief in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a control method for a freely-configured multi-split outdoor unit, comprising the following steps:

[0008] When the outdoor unit is running in heating mode and receives a user command to turn off some indoor units or lower the fan speed, the outdoor ambient temperature Touter loop is obtained;

[0009] When the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1, it is determined that pressure relief judgment control is required; otherwise, it is determined that the system does not need pressure relief processing;

[0010] When the outdoor unit operates in cooling or heating mode, the outdoor ambient temperature Touter loop is obtained;

[0011] When the obtained outdoor ambient temperature Touter ring ≤ the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

[0012] As a further improvement of the present invention, after determining that pressure relief judgment control is required, the method further includes:

[0013] Get the maximum tube temperature Tin tube max of the running internal machine;

[0014] When the maximum tube temperature Tin tube max of the running indoor unit ≥ the preset heating pressure relief inner tube temperature Tb, the three-way valve is controlled to be energized to connect the first bypass channel with the third refrigerant channel, and the bypass electronic expansion valve is opened and continuously opened at the preset bypass electronic expansion valve opening speed ΔP / min to perform bypass pressure relief.

[0015] As a further improvement of the present invention, after the bypass electronic expansion valve is opened and continuously opened at a preset bypass electronic expansion valve opening speed ΔP / min to perform bypass pressure relief, the method further includes:

[0016] Determine the opening of the bypass electronic expansion valve;

[0017] When the opening of the bypass electronic expansion valve is ≤ the maximum opening, the bypass electronic expansion valve is controlled to continue to open at a preset bypass electronic expansion valve opening speed ΔP / min until the opening is maximum; otherwise, the outdoor ambient temperature Touter loop and the preset heating pressure relief outer loop temperature T1 are compared again.

[0018] As a further improvement of the present invention, the process of opening the bypass electronic expansion valve and continuously opening it at a preset bypass electronic expansion valve opening speed ΔP / min also includes:

[0019] Get the maximum tube temperature Tin tube max of the running internal machine;

[0020] When the maximum pipe temperature Tin pipe max of the running indoor unit is less than the preset heating pressure relief inner pipe temperature Tb, the system pressure is determined to have dropped to the permissible range, the bypass pressure relief control is exited, the power of the three-way valve is disconnected, and the bypass electronic expansion valve is closed to end the bypass.

[0021] As a further improvement of the present invention, the determining that the system does not need pressure relief processing includes:

[0022] Disconnect the power to the three-way valve and close the bypass electronic expansion valve without bypassing.

[0023] As a further improvement of the present invention, after determining that the outdoor temperature is low and performing low-temperature start preheating, the method includes:

[0024] First, the bypass electronic expansion valve is opened, and at the same time, the three-way valve is energized, so that the first bypass channel is connected with the third refrigerant channel, so that the exhaust side and the suction side of the compressor are connected;

[0025] Then, the electronic expansion valves on the flow paths of several indoor unit heat exchangers are closed and the compressor is turned on, so that the refrigerant enters the first bypass channel to preheat the compressor.

[0026] As a further improvement of the present invention, after the electronic expansion valves on the flow paths of the indoor heat exchangers are closed and the compressor is turned on to allow the refrigerant to enter the first bypass channel to preheat the compressor, the method further includes:

[0027] Start the timer;

[0028] When the timer time t≥ the maximum low-temperature start-up preheating time t1 preset by the program, open the electronic expansion valves on the flow paths of several indoor unit heat exchangers, close the bypass electronic expansion valve, and disconnect the power of the three-way valve, ending the low-temperature start-up compressor preheating process and entering normal operation;

[0029] When the timer time t is less than the maximum preheating time t1 set by the program at low temperature, the exhaust temperature of the compressor is obtained;

[0030] When the compressor exhaust temperature is ≥ the program preset low-temperature preheating maximum exhaust temperature Tdt, the compressor is judged to have completed preheating, open several electronic expansion valves on the flow path of the indoor unit heat exchanger, close the bypass electronic expansion valve, and disconnect the power of the three-way valve to end the low-temperature start-up compressor preheating process and enter normal operation; otherwise, return to obtain the outdoor ambient temperature Touter loop.

[0031] The present invention provides a control device for executing the method, the control device comprising:

[0032] An acquisition unit, configured to acquire the outdoor ambient temperature Touter ring when the outdoor unit is operating in a heating mode and receives an operation command from a user to turn off part of the indoor units or lower the wind speed; and to acquire the outdoor ambient temperature Touter ring when the outdoor unit is operating in a cooling mode;

[0033] The judgment unit is used to determine that pressure relief judgment control is required when the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1; otherwise, it is determined that the system does not need pressure relief processing; and when the obtained outdoor ambient temperature Touter loop ≤ the preset low-temperature start-up ring temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

[0034] The present invention provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program can execute the method when executed by a processor.

[0035] An electronic device provided by the present invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the method through the computer program.

[0036] The present invention provides a free-distribution multi-split outdoor unit for executing the method, comprising a three-way valve, a third refrigerant channel, a second refrigerant channel, a first bypass channel, and a bypass electronic expansion valve; wherein:

[0037] One end of the first bypass channel is connected to the indoor unit heat exchanger flow path, and the other end is connected to the first port of the three-way valve;

[0038] One end of the third refrigerant channel is connected to the refrigerant flow path between the four-way valve and the first heat exchanger, and the other end is connected to the third port of the three-way valve;

[0039] One end of the second refrigerant channel is connected to the second port of the three-way valve, and the other end is connected to the refrigerant flow path between the indoor unit and the first heat exchanger;

[0040] The bypass electronic expansion valve is disposed in the first bypass passage.

[0041] The free-matching multi-split outdoor unit of the present invention adds a bypass flow path, adds an electronic expansion valve on the bypass flow path, and controls the positions of both ends of the bypass flow path through a three-way valve, so as to achieve different effects during cooling and heating. During heating, the gas on the high-pressure side of the system is directly introduced into the low-pressure side to achieve a pressure relief effect; and by controlling the opening of the bypass electronic expansion valve, the gas flow of the bypass is adjusted to achieve free adjustment of the pressure relief amount, so that the multi-split unit can operate stably and reliably under high load conditions and small capacity operation; and during cooling operation, after the refrigerant is heat exchanged by the heat exchanger, part of the refrigerant enters the indoor unit after throttling, and the other part returns to the suction side after throttling to replenish air and increase enthalpy, reduce system exhaust, and improve system stability and reliability. At the same time, the hot gas bypass can also be used in the low-temperature startup process to quickly increase the suction temperature, so that the compressor temperature can rise rapidly, ensuring the reliability of low-temperature operation.

[0042] The present invention provides a free-split multi-split air-conditioning system, comprising an outdoor unit and several sets of indoor units, all of the indoor units are arranged in parallel and connected to the outdoor unit through refrigerant flow paths respectively; an electronic expansion valve is arranged in each set of the refrigerant flow paths.

[0043] The present invention provides a free-distribution multi-connected air-conditioning system, which adds a bypass electronic expansion valve on the basis of the existing free-distribution system flow path, one end of which is connected to the E pipe port of the four-way valve, and the other end is respectively connected to the C pipe port of the four-way valve and the back of the first heat exchanger through a three-way valve; on the one hand, by adjusting the opening of the bypass electronic expansion valve, free adjustment of the unloading amount is achieved, so that the system can operate normally, stably and reliably under high load and low capacity, and at the same time, through the three-way valve passage selection, air replenishment control can be achieved during refrigeration, air replenishment and enthalpy increase are performed, the system exhaust is reduced, and the stable and reliable operation of the system is ensured; on the other hand, during the low-temperature operation startup process of the unit, the combined action of the electronic expansion valves is used to achieve hot gas bypass, quickly increase the superheat of the bottom of the compressor, and ensure the stable and reliable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a control flow chart of the control method of the free multi-split outdoor unit of the present invention;

[0046] Figure 2 It is a heating pressure relief control logic diagram of an embodiment of the control method of the free multi-split outdoor unit of the present invention;

[0047] Figure 3 It is a low temperature start control logic diagram of an embodiment of the control method of the free multi-split outdoor unit of the present invention;

[0048] Figure 4 It is a system diagram of the refrigeration state of the free-matching multi-connected outdoor unit of the present invention;

[0049] Figure 5 It is a system diagram of the heating state of the free multi-connection outdoor machine of the present invention;

[0050] Figure 6 This is a system composition diagram of the free multi-split air conditioning system of the present invention;

[0051] Figure 7 It is a refrigerant flow diagram of the free-split multi-connected air-conditioning system of the present invention in a heating state;

[0052] Figure 8 It is a refrigerant flow diagram of the free-distribution multi-split air-conditioning system of the present invention in a cooling state.

[0053] In the figure, 1 is a compressor; 2 is a four-way valve; 3 is a gas-liquid separator; 4 is a three-way valve; 5 is a first heat exchanger; 6 is a first bypass channel; 7 is a third refrigerant channel; 8 is a second refrigerant channel; 9 is a bypass electronic expansion valve; 10 is an electronic expansion valve A; 11 is an electronic expansion valve B; 12 is a second heat exchanger A; 13 is a second heat exchanger B. DETAILED DESCRIPTION

[0054] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0055] like Figure 1 As shown, the present invention provides a control method for a freely-configured multi-split outdoor unit, comprising the following steps:

[0056] Step S1, when the outdoor unit is operating in the heating mode and receives a user's command to turn off part of the indoor units or lower the fan speed, obtain the outdoor ambient temperature Touterloop;

[0057] Step S2: when the obtained outdoor environment temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1, it is determined that pressure relief judgment control is required; otherwise, it is determined that the system does not need pressure relief processing and operates normally;

[0058] Step S3: when the outdoor unit is operating in cooling or heating mode, obtaining the outdoor ambient temperature Touterloop;

[0059] Step S4: When the obtained outdoor ambient temperature Touter ring ≤ the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is low, and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high, and normal operation is performed.

[0060] The present invention adds a three-way valve and a bypass electronic expansion valve in the bypass flow path, selects different positions for bypass during refrigeration and heating operations, and can achieve refrigeration air replenishment and enthalpy increase control while relieving pressure in heating.

[0061] As an optional implementation manner of the present invention, after determining that pressure relief judgment control is required, the method further includes:

[0062] Step S21, obtaining the maximum tube temperature Tin tube max of the running internal machine;

[0063] Step S22, when the maximum tube temperature Tinner tube max of the running indoor unit ≥ the preset heating pressure relief inner tube temperature Tb, the three-way valve is controlled to be energized to connect the first bypass channel with the third refrigerant channel, and the bypass electronic expansion valve is opened and continuously opened at a preset bypass electronic expansion valve opening speed ΔP / min to perform bypass pressure relief.

[0064] It should be noted that after the bypass electronic expansion valve is opened and continuously opened at a preset bypass electronic expansion valve opening speed ΔP / min to perform bypass pressure relief, the following steps are also included:

[0065] Step S23, determining the opening degree of the bypass electronic expansion valve;

[0066] Step S24, when the opening of the bypass electronic expansion valve is ≤ the maximum opening, the bypass electronic expansion valve is controlled to continue to open at a preset bypass electronic expansion valve opening speed ΔP / min until the opening is maximum; otherwise, the outdoor ambient temperature Touter loop and the preset heating pressure relief outer loop temperature T1 are compared again.

[0067] Furthermore, the process of opening the bypass electronic expansion valve and continuously opening it at a preset bypass electronic expansion valve opening speed ΔP / min also includes:

[0068] Get the maximum tube temperature Tin tube max of the running internal machine;

[0069] When the maximum pipe temperature Tin pipe max of the running indoor unit is less than the preset heating pressure relief inner pipe temperature Tb, the system pressure is determined to have dropped to the permissible range, the bypass pressure relief control is exited, the power of the three-way valve is disconnected, and the bypass electronic expansion valve is closed to end the bypass.

[0070] As an optional implementation of the present invention, determining that the system does not need pressure relief processing includes:

[0071] Step S25, disconnect the power of the three-way valve, and close the bypass electronic expansion valve without bypassing.

[0072] As a further improvement of the present invention, after determining that the outdoor temperature is low and performing low temperature start preheating, the method includes:

[0073] Step S41, first open the bypass electronic expansion valve, and at the same time, the three-way valve is energized to connect the first bypass channel with the third refrigerant channel, so that the exhaust side and the suction side of the compressor are connected;

[0074] Step S42: Then, the electronic expansion valves on the flow paths of the heat exchangers of several indoor units are closed and the compressor is turned on, so that the refrigerant enters the first bypass channel to preheat the compressor.

[0075] Furthermore, after closing the electronic expansion valves on the flow paths of the heat exchangers of several indoor units and starting the compressor so that the refrigerant enters the first bypass channel to preheat the compressor, the method further includes:

[0076] Step S43, start the timer;

[0077] Step S44, when the timer time t≥ the maximum low-temperature start-up preheating time t1 preset by the program, open the electronic expansion valves on the flow paths of the indoor unit heat exchangers, close the bypass electronic expansion valve, and disconnect the power of the three-way valve, ending the low-temperature start-up compressor preheating process and entering normal operation;

[0078] Step S45, when the timer time t is less than the maximum preheating time t1 preset by the program for low-temperature startup, the exhaust temperature of the compressor is obtained;

[0079] Step S46: When the compressor exhaust temperature is ≥ the program preset low-temperature preheating maximum exhaust temperature Tdt, the compressor is judged to have completed preheating, several electronic expansion valves on the indoor unit heat exchanger flow paths are opened, the bypass electronic expansion valve is closed, and the power of the three-way valve is disconnected to end the low-temperature start-up compressor preheating process and enter normal operation; otherwise, return to obtain the outdoor ambient temperature Touter loop.

[0080] Embodiment 1:

[0081] When the free-distribution multi-connection outdoor heating machine of the present invention is used, Figure 5 and Figure 7 As shown, after the refrigerant is compressed by the compressor, it passes through the four-way valve D and E pipes, and part of the refrigerant enters the second heat exchanger A / B of each indoor unit for heating and heat exchange, and then after being throttled by the electronic expansion valve A / B, it passes through the first heat exchanger 5, the four-way valve 2, and the vapor-liquid separator 3 and returns to the compressor 1. Since each indoor unit is controlled and operated independently by the user, when the user turns off some indoor units or lowers the windshield of the indoor units, the unit operates at a small capacity, and a large amount of refrigerant will remain on the high-pressure side, causing the system pressure to rise rapidly. At this time, the opening of the electronic expansion valve can be adjusted to the preset value, and part of the high-pressure refrigerant directly returns to the compressor 1 through the bypass electronic expansion valve 9 to quickly reduce the pressure on the high-pressure side. The specific control method is: Figure 2 As shown in the figure, during the heating operation, when receiving the user's command to turn off some indoor units or lower the fan speed:

[0082] (1) First, detect the outdoor ambient temperature. If it is detected that Touter loop ≥ T1, it is determined that pressure relief control is required, and the heating bypass pressure relief is turned on. The first bypass channel 6 of the three-way valve is connected to the third refrigerant channel 7. At the same time, when the opening of the electronic expansion valve is adjusted to the preset value, part of the high-pressure refrigerant directly returns to the compressor through the bypass electronic expansion valve to quickly reduce the pressure on the high-pressure side. At the same time, by setting different opening preset values ​​under different conditions, the system pressure can be adjusted; specifically:

[0083] ① If the maximum pipe temperature of the running indoor unit is detected to be Tin pipe Max ≥ Tb, the three-way valve is energized to connect the first bypass channel 6 and the third refrigerant channel 7, and at the same time, the bypass electronic expansion valve is opened and continuously opened at a speed of ΔP / min until the opening is maximized.

[0084] ② During the process of widening the opening of the bypass electronic expansion valve, if it is detected that T inner tube Max < Tb, it is determined that the system pressure has dropped to the permitted range and the pressure relief control is exited. The power of the three-way valve is disconnected and the bypass electronic expansion valve is closed to end the bypass.

[0085] ③ If the opening is opened to the maximum, maintain the maximum opening and re-judge the Max conditions of T outer ring and T inner tube.

[0086] (2) If it is detected that Touterloop < T1 when receiving a user operation command, it is determined that the system does not need pressure relief processing, the power of the three-way valve is disconnected and the bypass electronic expansion valve is closed without bypassing.

[0087] Among them: T1 is the preset heating pressure relief outer ring temperature, generally around 24-28℃;

[0088] Tb is the preset heating pressure relief inner pipe temperature, which is generally around 58°C;

[0089] ΔP / min is the preset bypass electronic expansion valve opening speed, which is generally around 15P / min.

[0090] Embodiment 2:

[0091] When the free-matching multi-connection outdoor unit of the present invention is used for cooling or heating, Figure 4 and Figure 7 As shown, after being compressed by the compressor 1, the refrigerant enters the first heat exchanger 5 through the D and C ports of the four-way valve 2 for heat exchange; a portion of the refrigerant after heat exchange enters the indoor unit for heat exchange as needed, and the other portion can be returned to the suction port of the compressor 1 through the E and S ports of the four-way valve 2 through the bypass electronic expansion valve 9 to replenish air and increase enthalpy of the suction of the compressor 1. At this time, by controlling the opening of the bypass electronic expansion valve 8, the amount of replenishment can be adjusted as needed to reduce the exhaust of the system and ensure stable and reliable operation of the system. At this time, the three-way valve 4 is always in the power-off state, and the bypass electronic expansion valve 9 adjusts the opening according to the general model of replenishment and enthalpy increase.

[0092] The low-temperature startup operation process uses the following control logic. The refrigerant returns to compressor 1 after passing through compressor 1, three-way valve 4, bypass electronic expansion valve 9, four-way valve 2, and vapor-liquid separator 3. After circulation, the temperature of the refrigerant sucked into compressor 1 rises, quickly increasing the temperature of the lubricating oil at the bottom of the compressor to ensure reliable operation of the system.

[0093] The general control method is as follows, see the control logic diagram for details: Figure 3 As shown,

[0094] 1) When starting up, first detect the outdoor ambient temperature. If the outdoor temperature T is detected to be less than the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is low and low-temperature start-up preheating is required.

[0095] ① At this time, the bypass electronic expansion valve 9 is first opened, and at the same time, the three-way valve 4 is energized to connect the first bypass channel 6 and the third refrigerant channel 7, so that the exhaust side and the suction side of the compressor 1 are connected.

[0096] ②Then close the electronic expansion valve A / B and start the compressor, so that as much refrigerant as possible can enter the bypass branch to preheat the compressor. At the same time, start the timer.

[0097] ③ When the timer time meets t≥ the maximum preheating time t1 of the low-temperature start-up preset by the program, open the electronic expansion valve A / B, close the bypass electronic expansion valve, and disconnect the power of the three-way valve. End the preheating process of the compressor at low temperature start-up and enter normal operation.

[0098] ④ In addition, when the timer time t is less than the program preset low-temperature start preheating maximum time t1, if the exhaust temperature of the compressor reaches the program preset value Tdt, the compressor is also judged to have completed preheating, and the low-temperature start is ended according to point ③ for normal operation.

[0099] 2) If the outdoor temperature T detected when the machine is turned on is greater than the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is high and there is no need for low-temperature start-up preheating, and normal operation can be carried out directly.

[0100] T2 is the preset low temperature start-up ambient temperature, which is generally around -20℃~-30℃;

[0101] t1 is the maximum preheating time for low-temperature startup preset by the program, which is generally around 3 minutes;

[0102] Tdt is the maximum exhaust temperature preset by the program for low-temperature preheating, which is generally set to 40-50°C.

[0103] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0104] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0105] The present invention provides a control device for executing a method, the control device comprising:

[0106] An acquisition unit, configured to acquire the outdoor ambient temperature Touter ring when the outdoor unit is operating in a heating mode and receives an operation command from a user to turn off part of the indoor units or lower the wind speed; and to acquire the outdoor ambient temperature Touter ring when the outdoor unit is operating in a cooling mode;

[0107] The judgment unit is used to determine that pressure relief judgment control is required when the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1; otherwise, it is determined that the system does not need pressure relief processing; and when the obtained outdoor ambient temperature Touter loop ≤ the preset low-temperature start-up ring temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

[0108] It should be noted that the above-mentioned units can be functional modules or program modules, and can be implemented by software or hardware. For modules implemented by hardware, the above-mentioned modules can be located in the same processor; or the above-mentioned modules can be located in different processors in any combination.

[0109] It should be noted that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the above modules, as part of the device, can be run in a corresponding hardware environment, can be implemented by software, and can also be implemented by hardware, wherein the hardware environment includes a network environment.

[0110] The present invention provides a computer-readable storage medium. Optionally, in this embodiment, the computer-readable storage medium stores a program code for executing a control method, wherein the computer program code can execute each process of the control method embodiment described above when executed by a processor, and can achieve the same technical effect. To avoid repetition, it is not repeated here. The computer-readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0111] Optionally, in this embodiment, the storage medium may be located on at least one network device among a plurality of network devices in the network shown in the above embodiment.

[0112] Optionally, in this embodiment, the storage medium is configured to store program codes for executing the following steps:

[0113] When the outdoor unit is running in heating mode and receives a user command to turn off some indoor units or lower the fan speed, the outdoor ambient temperature Touter loop is obtained;

[0114] When the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1, it is determined that pressure relief judgment control is required; otherwise, it is determined that the system does not need pressure relief processing;

[0115] When the outdoor unit operates in cooling mode, the outdoor ambient temperature Touter loop is obtained;

[0116] When the obtained outdoor ambient temperature Touter ring ≤ the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

[0117] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0118] Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store program codes.

[0119] The embodiment of the present invention provides a terminal electronic device, including a memory, one or more processors and a computer program stored in the memory and running on the processor, a transmission device, and an input and output device; wherein the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the control method and the control device in the embodiment of the present invention, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, realizing the above-mentioned control method. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0120] The above-mentioned transmission device is used to receive or send data via a network, and can also be used for data transmission between a processor and a memory. Specific examples of the above-mentioned network may include wired networks and wireless networks. In one example, the transmission device includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices and routers via a network cable so as to communicate with the Internet or a local area network. In one example, the transmission device is a radio frequency (Radio Frequency, RF) module, which is used to communicate with the Internet wirelessly.

[0121] Specifically, the memory is used to store application programs.

[0122] The processor may call the application stored in the memory through the transmission device to perform the following steps:

[0123] When the outdoor unit is running in heating mode and receives a user command to turn off some indoor units or lower the fan speed, the outdoor ambient temperature Touter loop is obtained;

[0124] When the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1, it is determined that pressure relief judgment control is required; otherwise, it is determined that the system does not need pressure relief processing;

[0125] When the outdoor unit operates in cooling mode, the outdoor ambient temperature Touter loop is obtained;

[0126] When the obtained outdoor ambient temperature Touter ring ≤ the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

[0127] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0128] Those skilled in the art will appreciate that the terminal electronic device may be a smart phone (such as an Android phone, an iOS phone, etc.), a tablet computer, a PDA, a mobile Internet device (MID), a PAD, or other terminal devices.

[0129] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a computer-readable storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0130] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0131] If the integrated units in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0132] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0133] In the several embodiments provided in the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0134] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0135] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0136] like Figure 6 As shown, the present invention provides a free-distribution multi-split outdoor unit for executing the above control method. Specifically, the outdoor unit includes a three-way valve 4, a third refrigerant channel 7, a second refrigerant channel 8, a first bypass channel 6, and a bypass electronic expansion valve 9; wherein:

[0137] One end of the first bypass channel 6 is connected to the indoor unit heat exchanger flow path, and the other end is connected to the first port (E port) of the three-way valve 4;

[0138] One end of the third refrigerant channel 7 is connected to the refrigerant flow path between the four-way valve 2 and the first heat exchanger 5, and the other end is connected to the third port (port D) of the three-way valve 4; the refrigerant flow path connected to the first heat exchanger 5 is connected to the fourth port (port C) of the three-way valve 4.

[0139] One end of the second refrigerant channel 8 is connected to the second port (S port) of the three-way valve 4, and the other end is connected to the refrigerant flow path between the indoor unit and the first heat exchanger 5;

[0140] The bypass electronic expansion valve 9 is arranged in the first bypass channel 6 .

[0141] The free-matching multi-split outdoor unit of the present invention adds a bypass flow path, adds an electronic expansion valve on the bypass flow path, and controls the positions of both ends of the bypass flow path through a three-way valve, so as to achieve different effects during cooling and heating. During heating, the gas on the high-pressure side of the system is directly introduced into the low-pressure side to achieve a pressure relief effect; and by controlling the opening of the bypass electronic expansion valve, the bypass gas flow is adjusted to achieve free adjustment of the pressure relief amount, so that the multi-split unit can operate stably and reliably under high load conditions and small capacity operation; and during cooling operation, after the refrigerant is heat exchanged by the heat exchanger, part of the refrigerant enters the indoor unit after throttling, and the other part returns to the suction side after throttling to replenish air and increase enthalpy, reduce system exhaust, and improve system stability and reliability. At the same time, the hot gas bypass can also be used in the low-temperature startup process to quickly increase the suction temperature, so that the compressor temperature can rise rapidly, ensuring the reliability of low-temperature operation.

[0142] The present invention provides a free-split multi-connection air-conditioning system, comprising an outdoor unit and several sets of indoor units, all of which are arranged in parallel and connected to the outdoor unit through refrigerant flow paths respectively; an electronic expansion valve is arranged in each set of refrigerant flow paths.

[0143] Specifically, in this embodiment, there are two indoor units, the two indoor units include a second heat exchanger A12 and a second heat exchanger B13, and the two refrigerant flow paths are respectively provided with an electronic expansion valve A10 and an electronic expansion valve B11.

[0144] The present invention provides a free-distribution multi-connected air-conditioning system, which adds a bypass electronic expansion valve on the basis of the existing free-distribution system flow path, one end of which is connected to the E pipe port of the four-way valve, and the other end is respectively connected to the C pipe port of the four-way valve and the back of the first heat exchanger through a three-way valve; on the one hand, by adjusting the opening of the bypass electronic expansion valve, free adjustment of the unloading amount is achieved, so that the system can operate normally, stably and reliably under high load and low capacity, and at the same time, through the three-way valve passage selection, air replenishment control can be achieved during refrigeration, air replenishment and enthalpy increase are performed, the system exhaust is reduced, and the stable and reliable operation of the system is ensured; on the other hand, during the low-temperature operation startup process of the unit, the combined action of the electronic expansion valves is used to achieve hot gas bypass, quickly increase the superheat of the bottom of the compressor, and ensure the stable and reliable operation of the system.

[0145] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control method for a freely-configured multi-unit outdoor unit, characterized in that: The steps include: When the outdoor unit is running in heating mode and receives a user command to turn off some indoor units or lower the fan speed, the outdoor ambient temperature Touter loop is obtained; When the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1, it is determined that pressure relief judgment control is required; otherwise, it is determined that the system does not need pressure relief processing; When the outdoor unit operates in cooling or heating mode, the outdoor ambient temperature Touter loop is obtained; When the obtained outdoor ambient temperature Touter ring ≤ the preset low-temperature start-up ambient temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; Otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

2. The method according to claim 1, characterized in that After determining that pressure relief control is required, the method further includes: Get the maximum tube temperature Tin tube max of the running internal machine; When the maximum tube temperature Tin tube max of the running indoor unit ≥ the preset heating pressure relief inner tube temperature Tb, the three-way valve is controlled to be energized to connect the first bypass channel with the third refrigerant channel, and the bypass electronic expansion valve is opened and continuously opened at the preset bypass electronic expansion valve opening speed ΔP / min to perform bypass pressure relief.

3. The method according to claim 2, characterized in that After the bypass electronic expansion valve is opened and continuously opened at a preset bypass electronic expansion valve opening speed ΔP / min to perform bypass pressure relief, the method further includes: Determine the opening of the bypass electronic expansion valve; When the opening of the bypass electronic expansion valve is ≤ the maximum opening, the bypass electronic expansion valve is controlled to continue to open at a preset bypass electronic expansion valve opening speed ΔP / min until the opening is maximum; otherwise, the outdoor ambient temperature Touter loop and the preset heating pressure relief outer loop temperature T1 are compared again.

4. The method according to claim 2, characterized in that: The process of opening the bypass electronic expansion valve and continuously opening it at a preset bypass electronic expansion valve opening speed ΔP / min also includes: Get the maximum tube temperature Tin tube max of the running internal machine; When the maximum pipe temperature Tin pipe max of the running indoor unit is less than the preset heating pressure relief inner pipe temperature Tb, the system pressure is determined to have dropped to the permissible range, the bypass pressure relief control is exited, the power of the three-way valve is disconnected, and the bypass electronic expansion valve is closed to end the bypass.

5. The method according to claim 1, characterized in that The determination that the system does not require pressure relief treatment includes: Disconnect the power to the three-way valve and close the bypass electronic expansion valve without bypassing.

6. The method according to claim 1, characterized in that After determining that the outdoor temperature is low and performing low temperature start preheating, the method includes: First, the bypass electronic expansion valve is opened, and at the same time, the three-way valve is energized, so that the first bypass channel is connected with the third refrigerant channel, so that the exhaust side and the suction side of the compressor are connected; Then, the electronic expansion valves on the flow paths of several indoor unit heat exchangers are closed and the compressor is turned on, so that the refrigerant enters the first bypass channel to preheat the compressor.

7. The method according to claim 6, characterized in that After the electronic expansion valves on the flow paths of the heat exchangers of the indoor units are closed and the compressor is turned on to allow the refrigerant to enter the first bypass channel to preheat the compressor, the method further includes: Start the timer; When the timer time t≥ the maximum low-temperature start-up preheating time t1 preset by the program, open the electronic expansion valves on the flow paths of several indoor unit heat exchangers, close the bypass electronic expansion valve, and disconnect the power of the three-way valve, ending the low-temperature start-up compressor preheating process and entering normal operation; When the timer time t is less than the maximum preheating time t1 set by the program for low-temperature start-up, the exhaust temperature of the compressor is obtained; When the compressor exhaust temperature is ≥ the program preset low-temperature preheating maximum exhaust temperature Tdt, the compressor is judged to have completed preheating, open several electronic expansion valves on the flow path of the indoor unit heat exchanger, close the bypass electronic expansion valve, and disconnect the power of the three-way valve to end the low-temperature start-up compressor preheating process and enter normal operation; otherwise, return to obtain the outdoor ambient temperature Touter loop.

8. A control device, characterized in that: For executing the method according to any one of claims 1 to 7, the control device comprises: An acquisition unit, configured to acquire the outdoor ambient temperature Touter ring when the outdoor unit is operating in a heating mode and receives an operation command from a user to turn off part of the indoor units or lower the wind speed; and to acquire the outdoor ambient temperature Touter ring when the outdoor unit is operating in a cooling mode; The judgment unit is used to determine that pressure relief judgment control is required when the obtained outdoor ambient temperature Touter loop ≥ the preset heating pressure relief outer loop temperature T1; otherwise, it is determined that the system does not need pressure relief processing; and when the obtained outdoor ambient temperature Touter loop ≤ the preset low-temperature start-up ring temperature T2, it is determined that the outdoor temperature is low and low-temperature start preheating is performed; otherwise, it is determined that the outdoor temperature is high and normal operation is performed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, can perform the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method according to any one of claims 1 to 7 through the computer program.

11. A free-to-connect multi-unit outdoor unit, characterized in that: Used to perform the method as claimed in any one of claims 1 to 7, comprising a three-way valve, a third refrigerant channel, a second refrigerant channel, a first bypass channel, and a bypass electronic expansion valve; wherein: One end of the first bypass channel is connected to the indoor unit heat exchanger flow path, and the other end is connected to the first port of the three-way valve; One end of the third refrigerant channel is connected to the refrigerant flow path between the four-way valve and the first heat exchanger, and the other end is connected to the third port of the three-way valve; One end of the second refrigerant channel is connected to the second port of the three-way valve, and the other end is connected to the refrigerant flow path between the indoor unit and the first heat exchanger; The bypass electronic expansion valve is disposed in the first bypass passage.

12. A freely configurable multi-split air conditioning system, characterized in that: It comprises the outdoor unit as claimed in claim 11 and several sets of indoor units, all of the indoor units are arranged in parallel and are connected to the outdoor unit through refrigerant flow paths respectively; and an electronic expansion valve is arranged in each set of the refrigerant flow paths.

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