CN111878892A - Oil return method and device of multi-split air conditioner system, air conditioner and storage medium - Google Patents
Oil return method and device of multi-split air conditioner system, air conditioner and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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Abstract
An oil return method and device of a multi-split air conditioner system, an air conditioner and a storage medium relate to the technical field of air conditioners and comprise the following steps: detecting whether the multi-split air conditioner system is in an oil return mode or not, wherein in the oil return mode, the multi-split air conditioner system operates in a refrigeration mode and enables accumulated lubricating oil to return to the compressor; if yes, acquiring the outdoor environment temperature; and judging whether a first temperature preset condition is met or not according to the outdoor environment temperature, if so, determining at least one standby indoor unit as a condensation indoor unit, and adjusting a switch component and a throttling component corresponding to the determined condensation indoor unit so that the condensation indoor unit and the outdoor unit have condensation functions. In the oil return mode, part of the indoor units are changed into the outdoor units, so that the condensation effect is increased, the side liquid flow of the indoor units is increased, the system pressure is reduced, the frequency of the compressor can be further improved, the flow rate of the refrigerant is increased, the oil return effect is improved, and the use comfort of users is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an oil return method and device of a multi-split system, an air conditioner and a storage medium.
Background
In the multi-split system, after the compressor operates for a period of time at low frequency, special refrigeration oil return operation can be executed, so that lubricating oil accumulated in the system is returned to the compressor, and the normal lubrication operation of the compressor can be ensured. The existing refrigeration oil return operation generally increases the frequency of a compressor so as to increase the flow rate of a refrigerant; or the valve opening of the indoor unit is increased, so that a certain amount of liquid returns to the indoor unit side to drive the oil to return to the compressor.
The high efficiency of the oil return of the compressor determines whether the multi-split system is reliable, the oil return effect is improved to a certain extent mainly by simply increasing the frequency of the compressor or increasing the opening degree of a valve of an indoor unit in the conventional refrigeration oil return operation, but the frequency of the compressor and the opening degree of the valve of the indoor unit are correspondingly limited, so the improvement of the oil return effect is correspondingly limited, and the high efficiency is lacked.
Disclosure of Invention
The invention solves the problem of how to provide a refrigeration oil return control method for efficiently improving the oil return effect.
In order to solve the above problems, the present invention provides an oil return method for a multi-split system, wherein the multi-split system comprises an outdoor unit and at least one indoor unit; the control method of the refrigeration oil return of the multi-split air conditioning system comprises the following steps:
detecting whether the multi-split air-conditioning system is in an oil return mode or not, wherein in the oil return mode, the multi-split air-conditioning system operates in a refrigeration mode and enables accumulated lubricating oil to return to the compressor;
if yes, acquiring the outdoor environment temperature;
and judging whether a first temperature preset condition is met or not according to the outdoor environment temperature, if so, determining at least one standby indoor unit as a condensation indoor unit, and adjusting a switch component and a throttling component corresponding to the determined condensation indoor unit to enable the condensation indoor unit and the outdoor unit to have a condensation function, wherein the standby indoor unit is an indoor unit in a standby state in the multi-split system.
Therefore, when the outdoor environment temperature reaches the preset condition, the invention utilizes the adjustment of the plurality of switch components and the throttling components to ensure that the indoor unit has the same condensation function as the outdoor unit, namely, the indoor unit is converted into the outdoor unit through the switch components and the throttling components, thereby increasing the condensation effect, increasing the flow rate of the refrigerant, increasing the side liquid flow of the indoor unit, reducing the system pressure, further improving the frequency of the compressor, effectively improving the oil return effect and improving the use comfort level of a user.
Further, said determining at least one standby indoor unit as a condensing indoor unit comprises: and judging whether the distance between the standby indoor unit and the outdoor unit is smaller than a preset length, if so, determining that the standby indoor unit is the condensation indoor unit.
Therefore, the oil return efficiency is low even if the outdoor unit of the outdoor unit is used as a condensing indoor unit, so that the set length condition avoids utilizing the indoor unit of the outdoor unit to promote oil return, avoids resource waste and low oil return efficiency.
Further, the first preset temperature condition includes that the outdoor ambient temperature is greater than a first preset temperature.
Therefore, the first temperature preset condition is set, the condition that the outdoor environment temperature is high is effectively judged, and at the moment, the multi-split air conditioning system is high in operation load and needs effective oil return control.
Further, the adjusting the determined switch component and the throttle component corresponding to the condensing indoor unit to enable the condensing indoor unit and the outdoor unit to have a condensing effect comprises:
controlling a first electromagnetic valve corresponding to the condensing indoor unit to be closed so as to close a pipeline for refrigerant circulation between the condensing indoor unit and the four-way valve;
controlling a second electromagnetic valve corresponding to the condensing indoor unit to be opened so that the refrigerant flowing to an inlet of the outdoor unit simultaneously flows to an inlet of the condensing indoor unit, wherein the inlet of the outdoor unit is a refrigerant inlet of the outdoor unit in a refrigeration mode, and the inlet of the condensing indoor unit is a refrigerant outlet of the condensing indoor unit in the refrigeration mode;
and controlling an electronic expansion valve corresponding to the condensation indoor unit to reach a first preset opening degree so as to adjust the flow of the refrigerant flowing out of the condensation indoor unit.
From this, the condensation indoor set plays the condensation effect, and system condensation effect reinforcing, condensation pressure (high-pressure) descend, and the compressor frequency can further improve, and the refrigerant velocity of flow improves, and refrigerant liquid subcooling promotes, and the better drive oil of the refrigerant of liquid returns the compressor, effectively promotes the oil return effect, improves user's comfort in use.
Further, still include:
detecting whether the multi-split air conditioning system exits the oil return mode or not;
if so, adjusting the switch component and the throttling component corresponding to the condensation indoor unit to avoid liquid accumulation in the condensation indoor unit.
Therefore, when the multi-split air conditioner system exits the oil return mode, the switch component and the throttling component which are correspondingly configured for each condensing indoor unit are adjusted, and the liquid accumulation of the indoor units is avoided.
Further, adjust the switch part that the machine corresponds in the condensation with the throttle part, in order to avoid the machine hydrops in the condensation, include:
controlling a second electromagnetic valve corresponding to the condensing indoor unit to be closed so as to prevent the refrigerant flowing to an inlet of an outdoor unit from flowing to an inlet of the condensing indoor unit at the same time, wherein the inlet of the outdoor unit is a refrigerant inlet of the outdoor unit in a refrigeration mode, and the inlet of the condensing indoor unit is a refrigerant outlet of the condensing indoor unit in the refrigeration mode; controlling an electronic expansion valve corresponding to the condensing indoor unit to reach a second preset opening degree so as to adjust the flow of a refrigerant flowing out of the condensing indoor unit;
controlling a first electromagnetic valve corresponding to the condensing indoor unit to be opened so as to open a pipeline for refrigerant circulation between the condensing indoor unit and the four-way valve; controlling an inner fan corresponding to the condensation indoor unit to operate for a first preset time;
and when the running time of the inner fan reaches the first preset time, controlling the electronic expansion valve corresponding to the condensation indoor unit to be closed.
Therefore, when the multi-split air-conditioning system exits the oil return mode, the second electromagnetic valve is closed firstly, and the electronic expansion valve is adjusted to a second preset opening degree, so that an auxiliary air pipe is not used for transferring the refrigerant; then the first electromagnetic valve is opened, and the inner fan continues to operate for a first preset time to achieve the purposes of normal operation and accumulated liquid elimination; and finally, the inner fan is shut down after continuously running for a first preset time, and the electronic expansion valve is closed, so that the inner fan is effectively recovered to a normal standby state.
Further, still include:
detecting whether the multi-split air conditioning system exits the oil return mode or not;
if so, acquiring the indoor environment temperature corresponding to the condensation indoor unit;
and judging whether the indoor environment temperature meets a second temperature preset condition, and if so, controlling the corresponding condensation indoor unit to carry out temperature regulation.
Therefore, when the multi-split air conditioner system exits the oil return mode, the condensing indoor unit is used as a condenser, the corresponding indoor environment temperature is inevitably increased, temperature adjustment is needed to prevent the indoor environment temperature from being too high, and the influence of the too high temperature on the indoor environment where the condensing indoor unit is located is effectively avoided.
Further, the second preset temperature condition includes: the indoor ambient temperature is always greater than a second preset temperature for the duration.
Therefore, the second temperature preset condition is set, and the condition that the indoor environment temperature of the indoor condensing unit is high after oil return is effectively judged.
Further, the controlling the corresponding condensation indoor unit to adjust the temperature includes:
and controlling the corresponding indoor unit of the condensation chamber to perform cooling operation until the indoor environment temperature is detected to be lower than a third preset temperature.
Therefore, when the multi-split air conditioner system exits the oil return mode, the condensation indoor unit is correspondingly temperature-regulated until the indoor environment temperature is lower than the third preset temperature, and damage of the indoor furniture where the condensation indoor unit is located due to overhigh temperature is avoided.
The second objective of the present invention is to provide an oil return device for a multi-split air conditioning system, wherein in the oil return mode, part of the indoor units are changed into outdoor units, so as to increase the condensation effect, increase the flow rate of the refrigerant, increase the side liquid flow of the indoor units, reduce the system pressure, further increase the frequency of the compressor, improve the oil return effect, and improve the use comfort of the user.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an oil return device of a multi-split system comprises an outdoor unit and at least one indoor unit; the control device for refrigeration oil return comprises:
the detection unit is used for detecting whether the multi-split air conditioning system is in an oil return mode, wherein in the oil return mode, the multi-split air conditioning system operates to refrigerate and make accumulated lubricating oil return to the compressor;
the acquisition unit is used for acquiring the outdoor environment temperature if the outdoor environment temperature is lower than the preset outdoor environment temperature;
and the processing unit is used for judging whether a first temperature preset condition is met or not according to the outdoor environment temperature, if so, determining at least one standby indoor unit as a condensation indoor unit, and adjusting a switch component and a throttling component corresponding to the determined condensation indoor unit so as to enable the condensation indoor unit and the outdoor unit to have condensation functions, wherein the standby indoor unit is an indoor unit in a standby state in the multi-split system.
Compared with the prior art, the oil return device of the multi-split air conditioning system and the oil return method of the multi-split air conditioning system have the same beneficial effects, and are not described again.
A third objective of the present invention is to provide an air conditioner, in the oil return mode, a part of the indoor units are changed into outdoor units, so as to increase the condensation effect, increase the flow rate of the refrigerant, increase the side liquid flow of the indoor units, reduce the system pressure, further increase the frequency of the compressor, improve the oil return effect, and improve the use comfort of the user.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and executed by the processor, the oil return method of the multi-split air-conditioning system is realized.
Compared with the prior art, the air conditioner and the oil return method of the multi-split air conditioner system have the same beneficial effects, and are not repeated herein.
A fourth objective of the present invention is to provide a computer readable storage medium, wherein in the oil return mode, part of the indoor units are changed into outdoor units, so as to increase the condensing effect, increase the flow rate of the refrigerant, increase the side liquid flow of the indoor units, reduce the system pressure, further increase the frequency of the compressor, improve the oil return effect, and improve the use comfort of the user.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the oil return method of the multi-split air-conditioning system.
Compared with the prior art, the computer-readable storage medium and the oil return method of the multi-split air conditioning system have the same beneficial effects, and are not described herein again.
Drawings
Fig. 1 is a schematic structural diagram of a multi-split system according to an embodiment of the present invention;
fig. 2 is a first flow chart illustrating an oil return method of a multi-split system according to an embodiment of the present invention;
fig. 3 is a flow diagram illustrating a second oil return method of a multi-split system according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of the embodiment of the present invention for adjusting the switch member and the throttle member to avoid liquid accumulation;
fig. 5 is a schematic flow chart illustrating a third oil return method of a multi-split system according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of an oil return device of a multi-split system according to an embodiment of the invention;
reference numerals:
1-outdoor unit, 2-compressor, 3-four-way valve, 401-first condensing indoor unit, 402-second condensing indoor unit, 403-third condensing indoor unit, 404-running indoor unit, 501-first solenoid valve of first condensing indoor unit, 502-first solenoid valve of second condensing indoor unit, 503-first solenoid valve of third condensing indoor unit, 601-first auxiliary air pipe, 602-second auxiliary air pipe, 603-third auxiliary air pipe, 701-second solenoid valve of first condensing indoor unit, 702-second solenoid valve of second condensing indoor unit, 703-second solenoid valve of third condensing indoor unit, 801-first electronic expansion valve, 802-second electronic expansion valve, 803-third electronic expansion valve, 804-fourth electronic expansion valve, 805-fifth electronic expansion valve, 901-first filter, 902-second filter, 903-third filter, 904-fourth filter, 905-fifth filter, 906-sixth filter, 907-seventh filter, 908-eighth filter, 909-ninth filter, 910-tenth filter, 911-eleventh filter, 912-twelfth filter, 1001-first stop valve, 1002-second stop valve, 1003-third stop valve, 1004-fourth stop valve, 11-outdoor fan, 12-oil separator, 13-vapor separator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
At present, multi-split systems are increasingly used in many large places and public buildings. A multi-split system generally includes an outdoor unit and a plurality of indoor units, and the outdoor unit is connected to the indoor units via pipes. In the refrigeration process, the outdoor side adopts a condensation heat exchange mode, and the indoor side adopts a direct evaporation heat exchange mode, so that a good refrigeration effect is achieved. In the multi-split system, after the compressor operates for a period of time at low frequency, special refrigeration oil return operation can be executed, so that lubricating oil accumulated in the system is returned to the compressor, and the normal lubrication operation of the compressor can be ensured. The existing refrigeration oil return operation generally increases the frequency of a compressor so as to increase the flow rate of a refrigerant; or the opening degree of a valve of the indoor unit is increased, so that a certain amount of liquid returns to the side of the indoor unit to drive the oil to return to the compressor.
The high efficiency of the oil return of the compressor determines whether the multi-split system is reliable, the oil return effect is improved to a certain extent mainly by simply increasing the frequency of the compressor or increasing the opening degree of a valve of an indoor unit in the conventional refrigeration oil return operation, but the frequency of the compressor and the opening degree of the valve of the indoor unit are correspondingly limited, so that the improvement of the oil return effect is correspondingly limited, and the high-efficiency oil return effect cannot be ensured. Therefore, the technical problem which needs to be solved at present is to develop a refrigeration oil return control method capable of efficiently improving the oil return effect.
Fig. 1 is a schematic structural diagram of a refrigeration oil return multi-split air-conditioning system according to an embodiment of the present invention, including an outdoor unit 1, at least one indoor unit, a compressor 2, and a four-way valve 3, and specifically, the refrigeration oil return multi-split air-conditioning system further includes an auxiliary air pipe, where the auxiliary air pipe is used to connect a first end of the indoor unit and a first end of the outdoor unit 1, the first end of the indoor unit is a refrigerant outlet of the indoor unit in a refrigeration mode, and the first end of the outdoor unit 1 is a refrigerant inlet of the outdoor unit 1 in the refrigeration mode. Therefore, the auxiliary air pipe is arranged, so that the refrigerant flowing to the inlet of the outdoor unit simultaneously flows to the inlet of the condensing indoor unit, the refrigerant directly flows to the corresponding indoor unit from the auxiliary air pipe without passing through the condenser of the outdoor unit, the flow speed of the refrigerant is further increased, and the oil return effect is improved.
Specifically, referring to fig. 1, the standby indoor unit is an indoor unit in a standby state in the multi-split air-conditioning system, and in fig. 1, the indoor unit includes three standby indoor units, which are all in a state of being used as condensers, that is, as condensing indoor units, so in fig. 1, the indoor units include a first condensing indoor unit 401, a second condensing indoor unit 402, a third condensing indoor unit 403, and an operating indoor unit 404, and the first condensing indoor unit 401, the second condensing indoor unit 402, and the third condensing indoor unit 403 are indoor units in a standby state in the multi-split air-conditioning system, that is, condensing indoor units, corresponding to idle rooms, and the operating indoor unit 404 is an indoor unit in an operating state in the multi-split air-conditioning system, corresponding to a room in which an air conditioner is being used. The first condensation indoor unit 401 corresponds to the first auxiliary air pipe 601, the second condensation indoor unit 402 corresponds to the second auxiliary air pipe 602, the third condensation indoor unit 403 corresponds to the third auxiliary air pipe 603, and under the action of the corresponding auxiliary air pipes, heat exchangers of the first condensation indoor unit 401, the second condensation indoor unit 402 and the third condensation indoor unit 403 can perform a condensation function, so that the oil return effect is improved. It should be understood that, in the embodiment of the present invention, the condensing indoor units include the first condensing indoor unit 401, the second condensing indoor unit 402 … …, and the nth condensing indoor unit, which is not limited to the number, as long as the purpose of helping to improve the oil return effect is achieved.
Optionally, the indoor unit is provided with a plurality of corresponding switch components and throttle components for adjusting the refrigerant amount in a plurality of pipelines including the auxiliary air pipe, so that the indoor unit has the same condensation function as the outdoor unit. Therefore, the indoor unit is provided with the corresponding switch components and the throttle components, and the switch components and the throttle components are adjusted to ensure that the indoor unit has the same condensation effect as the outdoor unit, namely the indoor unit is converted into the outdoor unit through the switch components and the throttle components, so that the condensation effect is increased, the side liquid flow of the indoor unit is increased, the system pressure is reduced, the frequency of the compressor can be further improved, the flow rate of a refrigerant is increased, the oil return effect is improved, and the use comfort of a user is improved.
Optionally, as seen in fig. 1, the switching component includes a first solenoid valve and a second solenoid valve, the first solenoid valve is a solenoid valve between the indoor unit and the four-way valve, and the second solenoid valve is a solenoid valve on the auxiliary air pipe. Therefore, the first electromagnetic valve is arranged to enable the refrigerant coming from the auxiliary air pipe to flow through the corresponding indoor unit, so that the refrigerant is effectively prevented from directly flowing back to the press; the second electromagnetic valve is used for controlling the refrigerant to directly flow to the corresponding internal machine from the auxiliary air pipe without passing through the outdoor condenser. Through the cooperation of first solenoid valve and second solenoid valve use, make the indoor set effectively play the condensation effect, further increase the refrigerant velocity of flow, promote the oil return effect.
Specifically, as shown in fig. 1, the first solenoid valve 501 of the first condensing indoor unit is used to regulate the refrigerant flow of the pipe between the first condensing indoor unit 401 and the four-way valve 3, the first solenoid valve 502 of the second condensing indoor unit is used to regulate the refrigerant flow of the pipe between the second condensing indoor unit 402 and the four-way valve 3, and the first solenoid valve 503 of the third condensing indoor unit is used to regulate the refrigerant flow of the pipe between the third condensing indoor unit 403 and the four-way valve 3. The second solenoid valve 701 of the first condensing indoor unit is used for adjusting the refrigerant circulation of the first auxiliary air pipe 601, the second solenoid valve 702 of the second condensing indoor unit is used for adjusting the refrigerant circulation of the second auxiliary air pipe 602, and the second solenoid valve 703 of the third condensing indoor unit is used for adjusting the refrigerant circulation of the third auxiliary air pipe 603.
Alternatively, as seen in fig. 1, the throttling part includes an electronic expansion valve, and the electronic expansion valve is disposed on a pipe connecting the second end of the corresponding indoor unit and a first branch point, and the first branch point is connected to the second end of the outdoor unit at the same time. Therefore, the electronic expansion valve corresponding to the indoor unit is arranged, so that the liquid refrigerant in the pipe is effectively prevented from being reduced due to throttling and pressure reduction, and the oil return effect is prevented from being influenced.
Specifically, as seen in fig. 1, the first condensation indoor unit 401 corresponds to a first electronic expansion valve 801, the second condensation indoor unit 402 corresponds to a second electronic expansion valve 802, and the third condensation indoor unit 403 corresponds to a third electronic expansion valve 803. By adjusting the first electronic expansion valve 801, the second electronic expansion valve 802 and the third electronic expansion valve 803, the liquid refrigerant in the refrigerant outlet pipeline of the corresponding condensation indoor unit is prevented from being reduced, and the oil return effect is ensured.
Optionally, as shown in fig. 1, the multi-split system for returning refrigeration oil further includes: the filter comprises a first filter 901, a second filter 902, a third filter 903, a fourth filter 904, a fifth filter 905, a sixth filter 906, a seventh filter 907, an eighth filter 908, a ninth filter 909, a tenth filter 910, an eleventh filter 911 and a twelfth filter 912, wherein each filter is used for filtering impurities in a corresponding pipeline and preventing the valve from being blocked.
Optionally, as shown in fig. 1, the multi-split system for returning refrigeration oil further includes: a first cut-off valve 1001, a second cut-off valve 1002, a third cut-off valve 1003, and a fourth cut-off valve 1004, each for connecting a pipe, for regulating a pipe pressure.
Optionally, as shown in fig. 1, the multi-split system for returning refrigeration oil further includes: the outdoor unit comprises an outdoor fan 11, an oil separator 12 and a vapor separator 13, wherein the outdoor fan 11 is used for a fan of an outdoor unit, the oil separator 12 is used for separating lubricating oil in high-pressure steam discharged by a compressor in a refrigeration mode so as to ensure safe and efficient operation, and the vapor separator 13 is used for separating vapor and liquid so as to prevent liquid impact.
According to the refrigeration oil return multi-split system provided by the invention, by arranging the auxiliary air pipe, the plurality of switch components and the throttling component, part of indoor units are changed into outdoor units, the condensation effect is increased, the side liquid flow of the indoor units is increased, meanwhile, the system pressure is reduced, the frequency of the compressor can be further improved, the flow velocity of a refrigerant is increased, the oil return effect is improved, and the use comfort of users is improved.
Fig. 2 is a first flowchart illustrating an oil return method of a multi-split system according to an embodiment of the present invention, including steps S1 to S3, where:
in step S1, it is detected whether the multi-split air conditioning system is in an oil return mode in which the multi-split air conditioning system is operated in a cooling mode and the stored lubricating oil is returned to the compressor. Therefore, whether the multi-split air conditioning system is in the oil return mode or not is effectively judged, so that control operation is further performed, and the oil return effect is improved.
In step S2, if yes, the outdoor ambient temperature is acquired. Therefore, whether the multi-split air conditioner is in a severe working condition or not, such as a high-temperature condition, is effectively judged according to the outdoor environment temperature, the multi-split air conditioner needs to further promote oil return, and corresponding modulation is guaranteed to promote oil return at the moment.
In step S3, it is determined whether a first preset temperature condition is satisfied according to the outdoor ambient temperature, and if so, at least one standby indoor unit is determined as a condensing indoor unit, and a switching component and a throttling component corresponding to the determined condensing indoor unit are adjusted to enable both the condensing indoor unit and the outdoor unit 1 to have a condensing effect, where the standby indoor unit is an indoor unit in a standby state in the multi-split system. Therefore, the indoor unit is provided with the corresponding switch components and the corresponding throttling components, when the outdoor environment temperature reaches the preset condition, the switch components and the throttling components are adjusted, so that the indoor unit has the same condensation effect as the outdoor unit, namely, the indoor unit is converted into the outdoor unit through the switch components and the throttling components, the condensation effect is increased, the side liquid flow of the indoor unit is increased, the system pressure is reduced, the frequency of a compressor can be further improved, the flow rate of a refrigerant is increased, the oil return effect is effectively improved, and the use comfort of a user is improved.
Optionally, the determining at least one standby indoor unit as a condensing indoor unit includes: and judging whether the distance between the standby indoor unit and the outdoor unit 1 is less than the preset length, if so, determining that the standby indoor unit is a condensation indoor unit. Referring to fig. 1, it is determined whether the auxiliary air pipe corresponding to the standby indoor unit is smaller than a predetermined length. Therefore, the length condition is set, and specifically, whether the length condition is met is judged according to the length of the auxiliary air pipe, so that the outdoor unit of the outdoor unit is prevented from being used for promoting oil return, resource waste is avoided, and oil return efficiency is prevented from being low.
Optionally, the first preset temperature condition includes that the outdoor ambient temperature is greater than a first preset temperature. Therefore, the first temperature preset condition is set, the condition that the outdoor environment temperature is high is effectively judged, and at the moment, the multi-split air conditioning system is high in operation load and needs effective oil return control. In the embodiment of the present invention, the first preset temperature is preferably 43 ℃, so as to effectively determine the condition that the oil return needs to be promoted.
Optionally, step S3 specifically includes:
and controlling the closing of a first electromagnetic valve corresponding to the condensing indoor unit so as to close a pipeline for refrigerant circulation between the condensing indoor unit and the four-way valve. Thereby, cutting off the refrigerant circulation between the condensing indoor unit and the four-way valve;
and controlling a second solenoid valve corresponding to the condensing indoor unit to open so that the refrigerant flowing to the inlet of the outdoor unit simultaneously flows to the inlet of the condensing indoor unit, wherein the inlet of the outdoor unit is the refrigerant inlet of the outdoor unit 1 in the cooling mode, and the inlet of the condensing indoor unit is the refrigerant outlet of the condensing indoor unit in the cooling mode. Therefore, the refrigerant is effectively promoted to flow to the inlet of the outdoor unit and the inlet of the condensing indoor unit at the same time.
And controlling an electronic expansion valve corresponding to the condensing indoor unit to reach a first preset opening degree so as to adjust the flow of the refrigerant flowing out of the condensing indoor unit. Specifically, referring to fig. 1, a first electromagnetic valve corresponding to the condensing indoor unit is controlled to be closed, a second electromagnetic valve corresponding to the condensing indoor unit is controlled to be opened, and an electronic expansion valve corresponding to the condensing indoor unit is controlled to be adjusted to reach a first preset opening degree. From this, the condensation indoor set plays the condensation effect, and system condensation effect reinforcing, condensation pressure (high-pressure) descend, and the compressor frequency can further improve, and the refrigerant velocity of flow improves, and refrigerant liquid subcooling promotes, and the better drive oil of the refrigerant of liquid returns the compressor, effectively promotes the oil return effect, improves user's comfort in use. Preferably, the first preset opening degree is a maximum opening degree of the electronic expansion valve, so as to avoid throttling, maximize the refrigerant flow, and increase the refrigerant flow rate. It should be understood that, in the embodiment of the present invention, the above-mentioned switching component and throttling component are common hardware, and are not limited to the first solenoid valve, the second solenoid valve and the electronic expansion valve, as long as the corresponding switching function and throttling function can be achieved.
Fig. 3 is a flow chart illustrating a second oil return method of a multi-split air-conditioning system according to an embodiment of the present invention, where the method for controlling refrigeration oil return further includes steps S4 to S5, where:
in step S4, it is detected whether the multiple split air conditioning system exits the oil return mode. Therefore, whether the multi-split air conditioner system exits the oil return mode or not is detected, and the situation that the standby outdoor unit is continuously used for condensation to influence the continuous operation of the multi-split air conditioner system is avoided.
In step S5, if yes, the switch component and the throttle component that are correspondingly configured to the condensation indoor unit are adjusted to avoid liquid accumulation in the condensation indoor unit. Therefore, when the multi-split air conditioner system exits the oil return mode, the switch component and the throttling component which are correspondingly configured in the condensation indoor unit are adjusted, and liquid accumulation of the indoor unit is avoided.
Fig. 4 is a schematic flow chart illustrating the adjustment of the switch member and the throttle member to avoid liquid accumulation according to the embodiment of the present invention, which includes steps S51 to S53.
In step S51, the second solenoid valve corresponding to the condensing indoor unit is controlled to close, and the electronic expansion valve corresponding to the condensing indoor unit is controlled to reach a second preset opening degree. Therefore, referring to fig. 1, the second solenoid valve is controlled to be closed to prevent the refrigerant flowing to the outdoor unit inlet from flowing to the condensing indoor unit inlet simultaneously, wherein the outdoor unit inlet is the refrigerant inlet of the outdoor unit 1 in the cooling mode, the condensing indoor unit inlet is the refrigerant outlet of the condensing indoor unit in the cooling mode, and the electronic expansion valve is adjusted to the second preset opening degree to adjust the refrigerant flow flowing out of the condensing indoor unit. In the embodiment of the present invention, the second predetermined opening degree is preferably 20pls, so as to effectively control the refrigerant flow rate of the corresponding pipeline.
In step S52, a first solenoid valve corresponding to the condensing indoor unit is controlled to be opened, and an inner fan corresponding to the condensing indoor unit is controlled to operate for a first preset time. Therefore, by combining the figure 1, the first electromagnetic valve is opened, so that a pipeline for refrigerant circulation between the condensing indoor unit and the four-way valve is opened, the inner fan continues to operate for a first preset time, and the purposes of normal operation and accumulated liquid elimination are achieved. In the embodiment of the present invention, the first predetermined time period is preferably 10min, thereby effectively reducing the indoor temperature.
In step S53, when the operation duration of the inner fan reaches the first preset duration, the electronic expansion valve corresponding to the condensing indoor unit is controlled to close. Therefore, as seen in fig. 1, in general, when the multi-split air-conditioning system exits the oil return mode, the second electromagnetic valve is firstly closed, and the electronic expansion valve is adjusted to a second preset opening degree, so that the auxiliary air pipe is not used for transferring the refrigerant; then the first electromagnetic valve is opened, and the inner fan continues to operate for a first preset time to achieve the purposes of normal operation and accumulated liquid elimination; and finally, the inner fan is shut down after continuously running for a first preset time, and the electronic expansion valve is closed, so that the inner fan is effectively recovered to a normal standby state.
Fig. 5 is a flow chart illustrating a third method for controlling oil return of a multi-split air-conditioning system according to an embodiment of the present invention, where the method for controlling refrigeration oil return further includes steps S6 to S8, where:
in step S6, it is detected whether the multiple split air conditioning system exits the oil return mode. Therefore, whether the multi-split air conditioner system exits the oil return mode or not is detected, and the situation that the standby outdoor unit is continuously used for condensation to influence the continuous operation of the multi-split air conditioner system is avoided.
In step S7, if yes, the indoor ambient temperature of the condensing indoor unit is acquired. Therefore, whether the condensing indoor unit needs to adjust the corresponding indoor environment temperature or not is effectively judged through the indoor environment temperature.
In step S8, it is determined whether the indoor ambient temperature satisfies a second preset temperature condition, and if so, the corresponding condensing indoor unit is controlled to adjust the temperature. Therefore, when the multi-split air conditioner system exits the oil return mode, the condensing indoor unit is used as a condenser, the corresponding indoor environment temperature is inevitably increased, temperature adjustment is needed to prevent the indoor environment temperature from being too high, and the influence of the too high temperature on the indoor environment where the condensing indoor unit is located, such as the influence on furniture and the like, is effectively avoided.
Optionally, the second temperature preset condition includes: the indoor ambient temperature is always greater than the second preset temperature for the duration. Therefore, the second temperature preset condition is set, and the condition that the indoor environment temperature of the indoor condensing unit is high after oil return is effectively judged. In the embodiment of the present invention, the second preset temperature is preferably 38 ℃ and the duration is preferably 30min, so as to ensure the accurate temperature adjustment.
Optionally, step S8 specifically includes: and controlling the corresponding indoor condenser to perform cooling operation until the indoor environment temperature is detected to be lower than a third preset temperature. Therefore, when the multi-split air conditioner system exits the oil return mode, the condensation indoor unit is correspondingly temperature-regulated until the indoor environment temperature is lower than the third preset temperature, and damage of the indoor furniture where the condensation indoor unit is located due to overhigh temperature is avoided. In the present embodiment, the third preset temperature is preferably 32 ℃, ensuring the effect of final temperature regulation.
In an embodiment of the present invention, the first preset temperature is preferably 43 ℃, the first preset opening degree is the maximum opening degree of the electronic expansion valve, and when it is detected that the multi-split air-conditioning system enters the oil return mode, as shown in fig. 1, the outdoor ambient temperature is obtained to be 45 ℃ (greater than the first preset temperature by 43 ℃). The outdoor environment temperature meets a first temperature preset condition, and then the condensation indoor unit is determined: a first condensing indoor unit 401, a second condensing indoor unit 402, a third condensing indoor unit 403, and performing corresponding adjustments, wherein:
for the first condensing indoor unit 401, the first electromagnetic valve 501 of the first condensing indoor unit is closed, the second electromagnetic valve 701 of the first condensing indoor unit is opened, and the first electronic expansion valve 801 is adjusted to the maximum opening degree;
for the second condensing indoor unit 402, the first solenoid valve 502 of the second condensing indoor unit is closed, the second solenoid valve 702 of the second condensing indoor unit is opened, and the second electronic expansion valve 802 is adjusted to the maximum opening degree;
for the third condensing indoor unit 403, the first solenoid valve 503 of the third condensing indoor unit is closed, the second solenoid valve 703 of the third condensing indoor unit is opened, and the third electronic expansion valve 803 is adjusted to the maximum opening degree. Thus, the oil return operation is promoted until the oil return is completed by using the first, second, and third condensing indoor units 401, 402, and 403 as outdoor units.
In an embodiment of the present invention, the first preset time period is preferably 10min, and the second preset opening is preferably 20pls, when it is detected that the multi-split air-conditioning system exits the oil return mode, as shown in fig. 1, the first condensing indoor unit 401, the second condensing indoor unit 402, and the third condensing indoor unit 403 are adjusted accordingly, where:
for the first condensing indoor unit 401, the second electromagnetic valve 701 of the first condensing indoor unit is first closed, and the first electronic expansion valve 801 is adjusted to a second preset opening degree of 20 pls; then, a first electromagnetic valve 501 of the first condensation indoor unit is opened, and the corresponding inner fan is shut down after continuously running for a first preset time of 60 s; finally, after the corresponding inner fan continues to operate for the first preset time period of 60s, the first electronic expansion valve 801 is closed;
for the second condensing indoor unit 402, the second electromagnetic valve 701 of the second condensing indoor unit is first closed, and the second electronic expansion valve 802 is adjusted to a second preset opening degree of 20 pls; then, a first electromagnetic valve 502 of the second condensation indoor unit is opened, and the corresponding inner fan is shut down after continuously running for a first preset time of 60 s; finally, after the corresponding inner fan continues to operate for the first preset time period of 60s, the second electronic expansion valve 802 is closed;
for the third condensing indoor unit 403, the second electromagnetic valve 703 of the third condensing indoor unit is first closed, and the third electronic expansion valve 803 is adjusted to the second preset opening degree of 20 pls; then, a first electromagnetic valve 503 of the third condensation indoor unit is opened, and the corresponding inner fan is shut down after continuously running for a first preset time of 60 s; finally, after the corresponding inner blower continues to operate for the first preset time period of 60s, the third electronic expansion valve 803 is closed.
In an embodiment of the present invention, the second preset temperature is preferably 38 ℃, the duration is preferably 30min, the third preset temperature is preferably 32 ℃, and when it is detected that the multi-split air-conditioning system exits the oil return mode, as shown in fig. 1, corresponding indoor temperature adjustments are performed on the first condensing indoor unit 401, the second condensing indoor unit 402, and the third condensing indoor unit 403, and within the duration of 30min, the indoor ambient temperature of the first condensing indoor unit 401 is 39 ℃, the indoor ambient temperature of the second condensing indoor unit 402 is 30 ℃, and the indoor ambient temperature of the third condensing indoor unit 403 is 28 ℃, so that the indoor ambient temperature of the first condensing indoor unit 401 is 39 ℃ which is always greater than the second preset temperature 38 ℃, and corresponding adjustment needs to be performed on the indoor ambient temperature of the first condensing indoor unit 401, where: for the second condensing indoor unit 402, the operation is performed in a low wind gear at 26 ℃ in a refrigeration mode until the indoor environment temperature is detected to be lower than the third preset temperature by 32 ℃, and the temperature can be effectively reduced after the normal refrigeration operation is performed for 10 min. Thus, damage to indoor facilities in the idle room corresponding to the first condensation indoor unit 401 due to excessive temperature is effectively avoided.
In another embodiment of the present invention, referring to fig. 6, fig. 6 is a schematic structural diagram of an oil return device 6000 of a multi-split system according to an embodiment of the present invention, where the oil return device includes:
the detecting unit 6001 is configured to detect whether the multi-split air conditioning system is in an oil return mode, where in the oil return mode, the multi-split air conditioning system operates to perform cooling and return accumulated lubricating oil to the compressor;
an obtaining unit 6002, configured to obtain an outdoor ambient temperature if the ambient temperature is lower than the preset threshold;
the processing unit 6003 is configured to determine whether a first preset temperature condition is met according to the outdoor environment temperature, determine, if the first preset temperature condition is met, that at least one standby indoor unit serves as a condensing indoor unit, and adjust a switch component and a throttling component corresponding to the determined condensing indoor unit, so that both the condensing indoor unit and the outdoor unit 1 have a condensing effect, where the standby indoor unit is an indoor unit in a standby state in the multi-split system.
According to the oil return device of the multi-split air conditioner system, part of the indoor units are changed into the outdoor units in the oil return mode, the condensation effect is improved, the side liquid flow of the indoor units is increased, the system pressure is reduced, the frequency of the compressor can be further improved, the flow rate of a refrigerant is increased, the oil return effect is improved, and the use comfort of users is improved.
Another embodiment of the present invention provides an air conditioner, including a computer readable storage medium storing a computer program and a processor, where the computer program is read and executed by the processor to implement the oil return method of the multi-split air-conditioning system. Specifically, referring to fig. 1, an air conditioner according to an embodiment of the present invention is a multi-split air conditioner.
According to the air conditioner provided by the invention, in the oil return mode, part of the indoor units are changed into the outdoor units, so that the condensation effect is increased, the side liquid flow of the indoor units is increased, the system pressure is reduced, the frequency of the compressor can be further increased, the flow rate of a refrigerant is increased, the oil return effect is improved, and the use comfort of a user is improved.
The present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the oil return method of the multi-split system is implemented.
According to the computer readable storage medium provided by the invention, in the oil return mode, part of the indoor units are changed into the outdoor units, so that the condensation effect is increased, the side liquid flow of the indoor units is increased, the system pressure is reduced, the frequency of the compressor can be further improved, the flow rate of a refrigerant is increased, the oil return effect is improved, and the use comfort of a user is improved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. The oil return method of the multi-split system is characterized in that the multi-split system comprises an outdoor unit (1) and at least one indoor unit; the oil return method of the multi-split air conditioning system comprises the following steps:
detecting whether the multi-split air-conditioning system is in an oil return mode or not, wherein in the oil return mode, the multi-split air-conditioning system operates in a refrigeration mode and enables accumulated lubricating oil to return to the compressor;
if yes, acquiring the outdoor environment temperature;
and judging whether a first temperature preset condition is met or not according to the outdoor environment temperature, if so, determining at least one standby indoor unit as a condensation indoor unit, and adjusting a switch component and a throttling component corresponding to the determined condensation indoor unit to enable the condensation indoor unit and the outdoor unit (1) to have a condensation function, wherein the standby indoor unit is an indoor unit in a standby state in the multi-split system.
2. The oil return method of a multi-split system as claimed in claim 1, wherein the determining at least one standby indoor unit as a condensing indoor unit comprises:
and judging whether the distance between the standby indoor unit and the outdoor unit (1) is less than a preset length, if so, determining that the standby indoor unit is the condensation indoor unit.
3. The oil return method of a multi-split air conditioning system as claimed in claim 1, wherein the first preset temperature condition includes that the outdoor ambient temperature is greater than a first preset temperature.
4. The oil return method of a multi-split system as claimed in claim 1, wherein the adjusting the determined switch unit and throttle unit corresponding to the condensing indoor unit to make the condensing indoor unit and the outdoor unit (1) have a condensing function comprises:
controlling a first electromagnetic valve corresponding to the condensing indoor unit to be closed so as to close a pipeline for refrigerant circulation between the condensing indoor unit and the four-way valve;
controlling a second electromagnetic valve corresponding to the condensing indoor unit to be opened so that the refrigerant flowing to an inlet of the outdoor unit simultaneously flows to an inlet of the condensing indoor unit, wherein the inlet of the outdoor unit is a refrigerant inlet of the outdoor unit (1) in a refrigerating mode, and the inlet of the condensing indoor unit is a refrigerant outlet of the condensing indoor unit in the refrigerating mode;
and controlling an electronic expansion valve corresponding to the condensation indoor unit to reach a first preset opening degree so as to adjust the flow of the refrigerant flowing out of the condensation indoor unit.
5. The oil return method of a multi-split system as set forth in claim 1, further comprising:
detecting whether the multi-split air conditioning system exits the oil return mode or not;
if so, adjusting the switch component and the throttling component corresponding to the condensation indoor unit to avoid liquid accumulation in the condensation indoor unit.
6. The oil return method of a multi-split system as claimed in claim 5, wherein the adjusting the switch component and the throttling component corresponding to the condensing indoor unit to avoid liquid loading in the condensing indoor unit comprises:
controlling a second electromagnetic valve corresponding to the condensing indoor unit to be closed so as to prevent a refrigerant flowing to an inlet of the outdoor unit from simultaneously flowing to an inlet of the condensing indoor unit, wherein the inlet of the outdoor unit is a refrigerant inlet of the outdoor unit (1) in a refrigeration mode, and the inlet of the condensing indoor unit is a refrigerant outlet of the condensing indoor unit in the refrigeration mode; controlling an electronic expansion valve corresponding to the condensing indoor unit to reach a second preset opening degree so as to adjust the flow of a refrigerant flowing out of the condensing indoor unit;
controlling a first electromagnetic valve corresponding to the condensing indoor unit to be opened so as to open a pipeline for refrigerant circulation between the condensing indoor unit and the four-way valve; controlling an inner fan corresponding to the condensation indoor unit to operate for a first preset time;
and when the running time of the inner fan reaches the first preset time, controlling the electronic expansion valve corresponding to the condensation indoor unit to be closed.
7. The oil return method of a multi-split system as set forth in claim 1, further comprising:
detecting whether the multi-split air conditioning system exits the oil return mode or not;
if so, acquiring the indoor environment temperature corresponding to the condensation indoor unit;
and judging whether the indoor environment temperature meets a second temperature preset condition, and if so, controlling the corresponding condensation indoor unit to carry out temperature regulation.
8. The oil return method of a multi-split system as claimed in claim 7, wherein the second preset temperature condition includes: the indoor ambient temperature is always greater than a second preset temperature for the duration.
9. The oil return method of a multi-split system as claimed in claim 7, wherein the controlling the corresponding condensing indoor unit to perform temperature adjustment includes:
and controlling the indoor unit of the condensation chamber meeting the second temperature preset condition to perform cooling operation until the indoor environment temperature is detected to be lower than a third preset temperature.
10. The oil return device of the multi-split system is characterized in that the multi-split system comprises an outdoor unit (1) and at least one indoor unit; the control device for refrigeration oil return comprises:
the detection unit is used for detecting whether the multi-split air conditioning system is in an oil return mode, wherein in the oil return mode, the multi-split air conditioning system operates to refrigerate and make accumulated lubricating oil return to the compressor;
the acquisition unit is used for acquiring the outdoor environment temperature if the outdoor environment temperature is lower than the preset outdoor environment temperature;
and the processing unit is used for judging whether a first temperature preset condition is met or not according to the outdoor environment temperature, if so, determining at least one standby indoor unit as a condensation indoor unit, and adjusting a switch component and a throttling component corresponding to the determined condensation indoor unit so that the condensation indoor unit and the outdoor unit (1) have condensation functions, wherein the standby indoor unit is an indoor unit in a standby state in the multi-split system.
11. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read by the processor and executing the oil return method of the multi-split air conditioner according to any one of claims 1 to 9.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which is read and executed by a processor, and implements the oil return method of a multi-split air-conditioning system according to any one of claims 1 to 9.
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Effective date of registration: 20221028 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |