CN111503851A - Control method and device of multi-split air conditioning system - Google Patents
Control method and device of multi-split air conditioning system Download PDFInfo
- Publication number
- CN111503851A CN111503851A CN202010357500.6A CN202010357500A CN111503851A CN 111503851 A CN111503851 A CN 111503851A CN 202010357500 A CN202010357500 A CN 202010357500A CN 111503851 A CN111503851 A CN 111503851A
- Authority
- CN
- China
- Prior art keywords
- internal machines
- conditioning system
- air conditioning
- split air
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a control method and a device of a multi-split air conditioning system, wherein the control method comprises the following steps: when the current working environment temperature of the multi-split air conditioning system is greater than a temperature threshold value, detecting whether the working states of the N internal machines meet a preset state or not; if yes, recording the duration of the N internal machines in the preset state; and when the duration is greater than or equal to the first duration threshold, adjusting M internal machines in the heating standby state from the N internal machines into a cooling standby state, and continuing for a second duration, wherein M is an integer less than N. According to the control method provided by the invention, under some special operation conditions, the refrigerant with a large amount of oil dissolved in the internal machine can be discharged into the gas-liquid separator, so that the condition that the compressor is lack of oil is effectively avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control device of a multi-split air conditioning system.
Background
The multi-split air conditioning system with the heat recovery function has different internal machines and can simultaneously run a refrigerating mode and a heating mode, so that different requirements of cold and heat loads of different rooms can be met by using the multi-split air conditioning system with the heat recovery function, and the multi-split air conditioning system has obvious advantages compared with a common multi-split air conditioning system. The heat recovery type multi-split air conditioning system mainly comprises a two-pipe heat recovery type multi-split air conditioning system and a three-pipe heat recovery type multi-split air conditioning system, and the operation modes of the heat recovery type multi-split air conditioning system mainly comprise a pure refrigeration mode (an inner machine only operates in a refrigeration mode), a pure heating mode (an inner machine only operates in a heating mode), a main refrigeration mode (an inner machine simultaneously operates in a refrigeration and heating mode, at the moment, an outer machine serves as a condenser) and a main heating mode (an inner machine simultaneously operates in a refrigeration and heating mode, at the moment, the outer machine serves as an evaporator), wherein the main refrigeration mode and the main heating mode are uniformly called as a mixed mode.
In the related art, when the heat recovery type multi-split air conditioning system operates under some special operating conditions, for example, when the multi-split air conditioning system performs heating operation in an environment with high indoor and outdoor temperatures, because the multi-split air conditioning system has the characteristics of long main connecting pipes between the indoor unit and the outdoor unit, large connecting quantity of the indoor units, large refrigerant injection quantity and the like, a large amount of refrigerants can be stored in part of standby indoor units, oil is dissolved in the refrigerants, and therefore, the oil shortage of the system can be caused by the long-time large-amount liquid accumulation operation, and the oil shortage of the compressor can be caused.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a control method for a multi-split air conditioning system, which can discharge a refrigerant with a large amount of oil dissolved in an internal unit into a gas-liquid separator under some special operating conditions, thereby effectively avoiding an oil shortage of a compressor.
A second object of the present invention is to provide a control apparatus for a multi-split air conditioning system.
A third object of the invention is to propose an electronic device.
A fourth object of the invention is to propose a computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling a multi-split air conditioning system, where the multi-split air conditioning system includes an external unit and N internal units, where N is an integer greater than or equal to 2, and the method includes: when the current working environment temperature of the multi-split air conditioning system is greater than a temperature threshold value, detecting whether the working states of the N internal machines meet a preset state or not; if yes, recording the duration of the N internal machines in the preset state; and when the duration is greater than or equal to a first duration threshold, adjusting M of the N internal machines in the heating standby state to be in a cooling standby state, and continuing for a second duration, wherein M is an integer less than N.
According to the control method of the multi-split air conditioning system, when the current working environment temperature of the multi-split air conditioning system is greater than the temperature threshold, whether the working states of the N internal machines meet the preset state or not is detected, the duration of the N internal machines in the preset state is recorded when the working states of the N internal machines meet the preset state, and when the duration is greater than or equal to the first duration threshold, M internal machines in the heating standby state are adjusted to be in the cooling standby state and last for the second duration. Therefore, under some special operation conditions, the refrigerant with a large amount of oil accumulated in the internal machine can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
In addition, the control method of the multi-split air conditioning system according to the embodiment of the invention may further have the following additional technical features:
according to an embodiment of the invention, the preset state comprises: the method comprises the following steps that M internal machines are in a heating standby working state, N-M internal machines are in a heating state, and the ratio of the total capacity Mr of the N-M internal machines to the total capacity Nr of the N internal machines is smaller than a first proportional threshold.
According to an embodiment of the invention, the preset state comprises: the M internal machines are in a heating standby working state, the N-M internal machines are in a heating state, and the ratio of N-M to N is smaller than a second ratio threshold.
According to an embodiment of the present invention, the adjusting M of the N internal machines in the heating standby state to the cooling standby state includes: closing the electronic expansion valves corresponding to the M internal machines respectively; respectively closing the heating electromagnetic valves corresponding to the M internal machines in a power-off mode; and electrifying and opening the refrigeration electromagnetic valves respectively corresponding to the M internal machines.
According to an embodiment of the present invention, after adjusting M of the N internal machines in the heating standby state to the cooling standby state for a second duration, the method further includes: and adjusting the M internal machines to a heating standby state.
In order to achieve the above object, a control device of a multi-split air conditioning system according to an embodiment of a second aspect of the present invention includes an external unit and N internal units, where N is an integer greater than or equal to 2, and the control device includes: the detection module is used for detecting whether the working states of the N internal machines meet a preset state or not when the current working environment temperature of the multi-split air conditioning system is greater than a temperature threshold value; the timing module is used for recording the duration of the N internal machines in the preset state when the detection module detects that the working states of the N internal machines meet the preset state; and the control module adjusts M of the N internal machines in the heating standby state into a cooling standby state when the duration is greater than or equal to a first time threshold value, and the duration lasts for a second time, wherein M is an integer less than N.
According to the control device of the multi-split air conditioning system, whether the working states of the N internal machines meet the preset state or not is detected through the detection module when the current working environment temperature of the multi-split air conditioning system is larger than the temperature threshold, the duration of the N internal machines in the preset state is recorded through the timing module when the working states of the N internal machines meet the preset state, and when the duration is larger than or equal to the first duration threshold, the M internal machines in the heating standby state of the N internal machines are adjusted to be in the cooling standby state and last for the second duration through the control module. Therefore, under some special operation conditions, the refrigerant with a large amount of oil accumulated in the internal machine can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
In addition, the control device of the multi-split air conditioning system according to the embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the control module is specifically configured to: closing the electronic expansion valves corresponding to the M internal machines respectively; respectively closing the heating electromagnetic valves corresponding to the M internal machines in a power-off mode; and electrifying and opening the refrigeration electromagnetic valves respectively corresponding to the M internal machines.
According to an embodiment of the present invention, after adjusting M of the N internal machines in the heating standby state to the cooling standby state for a second duration, the control device is further configured to: and adjusting the M internal machines to a heating standby state.
To achieve the above object, an electronic device according to a third embodiment of the present invention includes a memory, a processor; the processor reads the executable program codes stored in the memory to run programs corresponding to the executable program codes, so as to implement the control method of the multi-split air conditioning system provided by the embodiment of the first aspect of the invention.
According to the electronic equipment provided by the embodiment of the invention, by the control method of the multi-split air conditioning system, under some special operation conditions, the refrigerant with a large amount of oil dissolved in the internal machine can be discharged into the gas-liquid separator, so that the condition that the compressor is lack of oil is effectively avoided.
To achieve the above object, a computer-readable storage medium according to a fourth embodiment of the present invention stores thereon a computer program, which, when executed by a processor, implements a method of controlling a multi-split air conditioning system according to the first embodiment of the present invention.
According to the computer-readable storage medium of the embodiment of the invention, by the control method of the multi-split air-conditioning system, under some special operation conditions, the refrigerant with a large amount of oil dissolved in the indoor unit can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
Drawings
Fig. 1 is a flowchart of a control method of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a control apparatus of a multi-split air conditioning system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of a multi-split air conditioning system, a control apparatus of a multi-split air conditioning system, an electronic device, and a computer-readable storage medium according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of a multi-split air conditioning system according to an embodiment of the present invention.
It should be noted that, in an embodiment of the present invention, the multi-split air conditioning system may be a three-pipe heat recovery type multi-split air conditioning system, and a specific structural schematic diagram thereof may be as shown in fig. 2. Certainly, the multi-split air conditioning system may also be a two-pipe heating recovery type multi-split air conditioning system, and the main difference between the two multi-split air conditioning systems is the number of main pipes in the refrigerant switching device between the external unit and the internal unit, wherein the number of the main pipes is three, and the corresponding multi-split air conditioning system is a three-pipe heating recovery type multi-split air conditioning system; the number of the main pipes is two, and the corresponding multi-split air conditioning system is a two-pipe heat recovery type multi-split air conditioning system.
As shown in fig. 2, the multi-split air conditioning system according to the embodiment of the present invention may include an outer unit 10 and N inner units, and the refrigerant flow direction switching device 30 is connected between the outer unit 10 and the N inner units 20. Where N is an integer greater than or equal to 2, only 4 inner units, i.e., the first inner unit 21, the second inner unit 22, the third inner unit 23, and the fourth inner unit 24, are shown in fig. 2.
The outdoor unit 10 may include an outdoor heat exchanger 11, a first heat exchanger 12 (which may be a plate heat exchanger), a compressor 13, a gas-liquid separator 14, an oil separator 15, a four-way valve ST1, and an outdoor throttling element EXVA. The oil outlet of the compressor 12 is connected with the first end of the oil separator 15, the second end of the oil separator 15 can be directly connected to the high-pressure air pipe, meanwhile, the second end of the oil separator 15 can also be connected with one end of the outdoor heat exchanger 11 through a four-way valve ST1, the other end of the outdoor heat exchanger 11 is connected to the high-pressure liquid pipe through an outdoor throttling element EXVA and the first heat exchanger 12, the oil inlet of the compressor 12 is connected to the low-pressure air pipe through the gas-liquid separator 14, and the air return port of the compressor 12 is connected to the low-pressure.
The first inner machine 21 includes a first indoor heat exchanger 210 and a first indoor throttling element EXV1 connected in series, the second inner machine 22 includes a second indoor heat exchanger 220 and a second indoor throttling element EXV2 connected in series, the third inner machine 23 includes a third indoor heat exchanger 230 and a third indoor throttling element EXV3 connected in series, and the fourth inner machine 24 includes a fourth indoor heat exchanger 240 and a fourth indoor throttling element EXV4 connected in series.
The refrigerant flow direction switching device 30 may include a second heat exchanger 31 (may be a plate heat exchanger), a supercooling circuit valve body EV, a plurality of cooling solenoid valves SVA1, SVA2, SVA3, and SVA4, and a plurality of heating solenoid valves SVB1, SVB2, SVB3, and SVB 4. The first to fourth indoor throttling elements EXV1 to EXV4 are all connected to each other through the second heat exchanger 31, and each indoor heat exchanger is respectively connected to one end of a corresponding cooling electromagnetic valve and one end of a corresponding heating electromagnetic valve, for example, the first indoor heat exchanger 210 is respectively connected to one end of a cooling electromagnetic valve SVA1 and one end of a heating electromagnetic valve SVB 1; the second indoor heat exchanger 220 is connected to one end of the cooling solenoid valve SVA2 and one end of the heating solenoid valve SVB2, respectively; the third indoor heat exchanger 230 is connected to one end of the cooling solenoid valve SVA3 and one end of the heating solenoid valve SVB3, respectively; the fourth indoor heat exchanger 240 is connected to one end of the cooling solenoid valve SVA4 and one end of the heating solenoid valve SVB4, respectively, the other ends of the heating solenoid valves SVB1 to SVB4 are connected to the high pressure gas pipe, and the other ends of the cooling solenoid valves SVA1 to SVA4 are connected to the low pressure gas pipe.
In an actual operation process, as shown in fig. 2, when the multi-split air conditioning system operates in a pure heating operation mode in which one heating indoor unit is turned on, for example, the fourth indoor unit 24 is in a heating operation state, and the first to third indoor units 21 to 23 are in heating standby states. When the indoor and outdoor temperatures are high, for example, the indoor and outdoor temperatures are greater than 25 ℃, the multi-split air conditioning system is in a maximum load heating state. At the moment, the inner fan is in the minimum low windshield, and the multi-split air conditioning system is in the maximum load heating single-start running state with higher condensation pressure and evaporation pressure. High-temperature high-pressure gaseous refrigerant compressed by the compressor 12 enters each indoor unit through the opened heating electromagnetic valves SV 1B-SV 4B along the high-pressure air pipe, only the fan of the fourth indoor unit 24 is in a low-wind-speed running state at the moment, the high-temperature high-pressure gaseous refrigerant is condensed at the inner machine side, the condensed high-temperature high-pressure liquid refrigerant flows to the outdoor throttling element EXVA along the high-pressure air pipe, is throttled by the outdoor throttling element EXVA to become low-temperature low-pressure gas-liquid two-phase refrigerant, enters the outdoor heat exchanger 11 to be evaporated, and the evaporated gaseous refrigerant returns to the compressor 12 through the gas-liquid separator 14 to be recompressed. When the refrigerant is condensed at the inner machine side, the inner environment temperature is high, the air volume is small, the heat release amount of condensation is small, the condensation pressure of the system is high, meanwhile, the heat exchanger at the outer machine side is large, the environment temperature is high, the overall heat exchange amount is small, the evaporation temperature of the outer machine side is high, the corresponding system evaporation pressure is also high, and the system is in a high-pressure low-pressure high state under the low-frequency operation of the compressor.
At this time, each indoor unit electronic expansion valve is in an open state, the flow rate of each indoor unit is limited, a large amount of liquid refrigerant is stored in the indoor unit in a heating standby state due to high system high pressure, so that the refrigerant in the gas-liquid separator 14 for storing redundant refrigerant can be gradually transferred to the indoor unit in the heating standby state, along with the extension of the operation time, the gas-liquid separator 14 can be slowly emptied, and the risk of oil shortage of the compressor 12 caused by the fact that the gas-liquid separator 14 can return without oil before the system is started to force oil return can occur.
Therefore, the invention provides a control method of a multi-split air conditioning system, which can discharge the refrigerant dissolved with a large amount of oil accumulated in an internal machine into a gas-liquid separator under some special operation conditions (for example, heating operation is carried out in an environment with high indoor and outdoor temperatures), thereby effectively avoiding the oil shortage of a compressor.
Specifically, as shown in fig. 1, the control method of the multi-split air conditioning system according to the embodiment of the present invention may include the steps of:
and S1, detecting whether the working states of the N internal machines meet the preset state or not when the current working environment temperature of the multi-split air conditioning system is greater than the temperature threshold value.
According to one embodiment of the invention, the preset state comprises: the M internal machines are in a heating standby working state, the N-M internal machines are in a heating state, and the ratio of the total capacity Mr of the N-M internal machines to the total capacity Nr of the N internal machines is smaller than a first proportional threshold.
According to another embodiment of the invention, the preset state comprises: the M internal machines are in a heating standby working state, the N-M internal machines are in a heating state, and the ratio of N-M to N is smaller than a second ratio threshold.
Specifically, when the current working temperature of the multi-split air conditioning system is detected to be greater than a temperature threshold, for example, when the indoor and outdoor temperatures are detected to be greater than 25 ℃, it is further required to detect whether the working states of the N internal machines meet a preset state, so as to determine whether the multi-split air conditioning system is in a special operating state.
As a possible implementation manner, when it is detected that M internal machines are in a heating standby operating state, N-M internal machines are in a heating state, and a ratio of a total capacity Mr of the N-M internal machines to a total capacity Nr of the N internal machines is smaller than a first proportional threshold (the first proportional threshold may be calibrated according to an actual situation), it is determined that the multi-split air-conditioning system is in a heating operating state of the single-open N-M heating internal machines, and at this time, the system is in a state where high pressure, low pressure and high pressure are also high, so that it may be determined whether the multi-split air-conditioning system is in a special operating state.
As another possible implementation manner, when it is detected that M internal machines are in a heating standby operating state, N-M internal machines are in a heating state, and the ratio of N-M to N is smaller than the second ratio threshold, for example, 3 internal machines are in a heating standby operating state, and 1 internal machine is in a heating state, it may also be determined that the multi-split air-conditioning system is in a heating operating state of a single-open N-M heating internal machines, and at this time, the system is in a state where high voltage, and low voltage are also high, and thus, it may be determined whether the multi-split air-conditioning system is in a special operating state.
And S2, if yes, recording the duration of the N internal machines in the preset state.
When the current working environment temperature of the multi-split air conditioning system is detected to be greater than a temperature threshold value and the working states of the N internal machines meet a preset state, the duration of the N internal machines in the preset state is recorded through a timer.
And S3, when the duration is longer than or equal to the first time threshold, adjusting M of the N internal machines in the heating standby state to the cooling standby state, and continuing for a second time. Wherein M is an integer less than N.
According to an embodiment of the present invention, adjusting M of N indoor units in a heating standby state to a cooling standby state includes: closing the electronic expansion valves corresponding to the M internal machines respectively; respectively closing heating electromagnetic valves corresponding to the M internal machines in a power-off mode; and electrifying and opening the refrigeration electromagnetic valves respectively corresponding to the M internal machines.
According to an embodiment of the present invention, after adjusting M of the N internal machines in the heating standby state to the cooling standby state for a second duration, the method further includes: and adjusting the M internal machines to a heating standby state.
Specifically, when the current working environment temperature of the multi-split air conditioning system is detected to be greater than a temperature threshold value and the working states of the N internal machines are detected to meet a preset state, the duration of the preset state of the N internal machines is recorded by a timer, when the duration is greater than or equal to a first duration threshold value (for example, b hours), the electronic expansion valves corresponding to the M internal machines are closed, the heating electromagnetic valves corresponding to the M internal machines are closed in a power-off mode, the cooling electromagnetic valves corresponding to the M internal machines are powered on and opened, for example, as shown in fig. 2, the fourth internal machine 24 is in a heating operation state, the first to third internal machines 21 to 23 are in a heating standby state, the opening degrees of the indoor throttling elements EXV1 to EXV3 corresponding to the first to third internal machines 21 to 23 can be adjusted to 0, and the heating electromagnetic valves SVB1 to SVB3 corresponding to the first to third internal machines 21 to 23 are powered off, and finally, electrifying and opening the refrigeration electromagnetic valves SVA 1-SVA 3 corresponding to the first to third inner machines 21-23, wherein at the moment, the mixed liquid of the oil and the refrigerant in the first to third inner machines 21-23 is discharged to the gas-liquid separator along the refrigerant flow direction to a low-pressure gas pipe in the switching device due to the pressure difference, so that the oil in the compressor can return.
Furthermore, M internal machines in the heating standby state of the N internal machines are adjusted to the cooling standby state, after the second time period (for example, c minutes), the refrigeration electromagnetic valves corresponding to the M internal machines can be powered off and closed, simultaneously, the heating electromagnetic valves respectively corresponding to the M internal machines are electrified and opened, then the electronic expansion valves respectively corresponding to the M internal machines are opened to standby opening degrees, for example, as shown in fig. 2, the fourth indoor unit 24 is still in the heating operation state, and the first to third indoor units 21 to 23 are in the heating standby state, the refrigeration electromagnetic valves SVA 1-SVA 3 corresponding to the first to third internal machines 21-23 can be powered off and closed, meanwhile, heating electromagnetic valves SVB 1-SVB 3 corresponding to the first to third indoor units 21-23 are electrified and opened, and then indoor throttling elements EXV 1-EXV 3 corresponding to the first to third indoor units 21-23 are opened to standby opening degrees.
Therefore, under some special operation conditions, the refrigerant with a large amount of oil accumulated in the internal machine can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
In summary, according to the control method of the multi-split air conditioning system in the embodiment of the present invention, when the current working environment temperature of the multi-split air conditioning system is greater than the temperature threshold, it is detected whether the working states of the N internal machines meet the preset state, and when the working states of the N internal machines meet the preset state, the duration of the N internal machines in the preset state is recorded, and when the duration is greater than or equal to the first duration threshold, M internal machines in the heating standby state among the N internal machines are adjusted to the cooling standby state and last for the second duration. Therefore, under some special operation conditions, the refrigerant with a large amount of oil accumulated in the internal machine can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
Fig. 3 is a block schematic diagram of a control apparatus of a multi-split air conditioning system according to an embodiment of the present invention.
It should be noted that the multi-split air conditioning system in the embodiment of the present invention may include an external unit and N internal units, where N is an integer greater than or equal to 2.
As shown in fig. 3, the control apparatus of the multi-split air conditioning system according to an embodiment of the present invention may include: a detection module 100, a timing module 200, and a control module 300.
The detection module 100 is configured to detect whether the working states of the N internal machines meet a preset state when the current working environment temperature of the multi-split air conditioning system is greater than a temperature threshold; the timing module 200 is configured to record duration of the N internal machines in the preset state when the working states of the N internal machines meet the preset state; when the duration is greater than or equal to the first time threshold, the control module 300 adjusts M of the N internal machines in the heating standby state to the cooling standby state, and continues for a second time, where M is an integer less than N.
According to an embodiment of the present invention, the control module 300 is specifically configured to: closing the electronic expansion valves corresponding to the M internal machines respectively; respectively closing heating electromagnetic valves corresponding to the M internal machines in a power-off mode; and electrifying and opening the refrigeration electromagnetic valves respectively corresponding to the M internal machines.
According to an embodiment of the present invention, after adjusting M of the N internal machines in the heating standby state to the cooling standby state for the second time period, the control device 300 is further configured to: and adjusting the M internal machines to a heating standby state.
It should be noted that details that are not disclosed in the control device of the multi-split air conditioning system according to the embodiment of the present invention refer to details that are disclosed in the control method of the multi-split air conditioning system according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the control device of the multi-split air conditioning system, whether the working states of the N internal machines meet the preset state or not is detected through the detection module when the current working environment temperature of the multi-split air conditioning system is larger than the temperature threshold, the duration of the N internal machines in the preset state is recorded through the timing module when the working states of the N internal machines meet the preset state, and when the duration is larger than or equal to the first duration threshold, the M internal machines in the heating standby state of the N internal machines are adjusted to be in the cooling standby state and last for the second duration through the control module. Therefore, under some special operation conditions, the refrigerant with a large amount of oil accumulated in the internal machine can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
In addition, an embodiment of the present invention further provides an electronic device, including a memory and a processor; the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the control method of the multi-split air conditioning system.
According to the electronic equipment provided by the embodiment of the invention, by the control method of the multi-split air conditioning system, under some special operation conditions, the refrigerant with a large amount of oil dissolved in the internal machine can be discharged into the gas-liquid separator, so that the condition that the compressor is lack of oil is effectively avoided.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the multi-split air conditioning system described above.
According to the computer-readable storage medium of the embodiment of the invention, by the control method of the multi-split air-conditioning system, under some special operation conditions, the refrigerant with a large amount of oil dissolved in the indoor unit can be discharged into the gas-liquid separator, so that the condition of oil shortage of the compressor is effectively avoided.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of a multi-split air conditioning system is characterized in that the multi-split air conditioning system comprises an outer unit and N inner units, wherein N is an integer greater than or equal to 2, and the control method comprises the following steps:
when the current working environment temperature of the multi-split air conditioning system is greater than a temperature threshold value, detecting whether the working states of the N internal machines meet a preset state or not;
if yes, recording the duration of the N internal machines in the preset state;
and when the duration is greater than or equal to a first duration threshold, adjusting M of the N internal machines in the heating standby state to be in a cooling standby state, and continuing for a second duration, wherein M is an integer less than N.
2. The control method of a multi-split air conditioning system as set forth in claim 1, wherein the preset state includes:
the method comprises the following steps that M internal machines are in a heating standby working state, N-M internal machines are in a heating state, and the ratio of the total capacity Mr of the N-M internal machines to the total capacity Nr of the N internal machines is smaller than a first proportional threshold.
3. The control method of claim 1, wherein the preset state comprises:
the M internal machines are in a heating standby working state, the N-M internal machines are in a heating state, and the ratio of N-M to N is smaller than a second ratio threshold.
4. The method for controlling a multi-split air conditioning system as claimed in any one of claims 1 to 3, wherein the adjusting of M of the N internal machines, which are in a heating standby state, to a cooling standby state includes:
closing the electronic expansion valves corresponding to the M internal machines respectively;
respectively closing the heating electromagnetic valves corresponding to the M internal machines in a power-off mode;
and electrifying and opening the refrigeration electromagnetic valves respectively corresponding to the M internal machines.
5. The method for controlling a multi-split air conditioning system as claimed in any one of claims 1 to 3, wherein after adjusting M of the N internal machines in a heating standby state to a cooling standby state for a second period of time, the method further comprises:
and adjusting the M internal machines to a heating standby state.
6. The utility model provides a controlling means of multi-split air conditioning system which characterized in that, multi-split air conditioning system includes outer machine and N internal machines, and wherein, N is the integer that is greater than or equal to 2, controlling means includes:
the detection module is used for detecting whether the working states of the N internal machines meet a preset state or not when the current working environment temperature of the multi-split air conditioning system is greater than a temperature threshold value;
the timing module is used for recording the duration of the N internal machines in the preset state when the working states of the N internal machines meet the preset state;
and the control module adjusts M of the N internal machines in the heating standby state into a cooling standby state when the duration is greater than or equal to a first time threshold value, and the duration lasts for a second time, wherein M is an integer less than N.
7. The control device of a multi-split air conditioning system as claimed in claim 6, wherein the control module is specifically configured to:
closing the electronic expansion valves corresponding to the M internal machines respectively;
respectively closing the heating electromagnetic valves corresponding to the M internal machines in a power-off mode;
and electrifying and opening the refrigeration electromagnetic valves respectively corresponding to the M internal machines.
8. The control device of a multi-split air conditioning system as claimed in claim 6, wherein the control device adjusts M of the N internal machines in a heating standby state to a cooling standby state for a second period of time, and further:
and adjusting the M internal machines to a heating standby state.
9. An electronic device comprising a memory, a processor;
wherein the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory, for implementing the control method of the multi-split air conditioning system as set forth in any one of claims 1 to 5.
10. A computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements a control method of a multi-split air conditioning system as set forth in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357500.6A CN111503851B (en) | 2020-04-29 | 2020-04-29 | Control method and device of multi-split air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357500.6A CN111503851B (en) | 2020-04-29 | 2020-04-29 | Control method and device of multi-split air conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111503851A true CN111503851A (en) | 2020-08-07 |
| CN111503851B CN111503851B (en) | 2021-12-31 |
Family
ID=71873144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010357500.6A Active CN111503851B (en) | 2020-04-29 | 2020-04-29 | Control method and device of multi-split air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111503851B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465109A (en) * | 2021-06-29 | 2021-10-01 | 青岛海尔空调电子有限公司 | Low-energy-consumption standby control method, device and medium of multi-split air conditioner |
| CN113669784A (en) * | 2021-07-12 | 2021-11-19 | 浙江中广电器股份有限公司 | Control method for improving oil shortage of compressor during starting of waterless floor heating and triple co-generation system |
Citations (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110167841A1 (en) * | 2004-06-04 | 2011-07-14 | Brasscorp Limited | Compositions and methods for injection of sealants and/or drying agents into air conditioning and refrigeration systems |
| JP4847851B2 (en) * | 2006-12-14 | 2011-12-28 | ヤマハ発動機株式会社 | Multi-connection module type surface mounting apparatus and multi-connection type surface mounting machine system |
| CN104180563A (en) * | 2013-05-27 | 2014-12-03 | 珠海格力电器股份有限公司 | Method for returning oil during heating of multi-online system |
| CN104792076A (en) * | 2015-04-28 | 2015-07-22 | 广东美的暖通设备有限公司 | Three-tube multi-split air-conditioning system oil return or defrosting control method and system thereof |
| CN104833126A (en) * | 2015-03-31 | 2015-08-12 | 广东美的暖通设备有限公司 | Variable refrigerant volume system |
| JP2015222157A (en) * | 2014-05-23 | 2015-12-10 | 株式会社富士通ゼネラル | Air conditioning device |
| CN105864982A (en) * | 2016-04-25 | 2016-08-17 | 广东美的暖通设备有限公司 | Multi-split air conditioner system and control method thereof |
| CN105928059A (en) * | 2016-04-25 | 2016-09-07 | 广东美的暖通设备有限公司 | Multi-online system and control method for heating and throttling element of multi-online system |
| CN205619641U (en) * | 2016-05-05 | 2016-10-05 | 广东志高暖通设备股份有限公司 | Multi -split air conditioning system |
| CN106352472A (en) * | 2016-08-19 | 2017-01-25 | 广东美的暖通设备有限公司 | Multi-online system and linkage fault detection method thereof |
| CN106766420A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method for heating the anti-hydrops of interior machine |
| CN107860103A (en) * | 2017-10-27 | 2018-03-30 | 广东美的暖通设备有限公司 | The control method of multiple on-line system, device and there is its system |
| CN108168138A (en) * | 2018-01-02 | 2018-06-15 | 珠海格力电器股份有限公司 | Outdoor unit, air-conditioning system and control method |
| KR101898331B1 (en) * | 2016-08-19 | 2018-09-12 | 엘지전자 주식회사 | air conditioner |
| CN109357440A (en) * | 2018-10-26 | 2019-02-19 | 宁波奥克斯电气股份有限公司 | A kind of multi-connected machine heating method for controlling oil return and multi-gang air-conditioner device |
| CN109386909A (en) * | 2018-10-22 | 2019-02-26 | 广东美的暖通设备有限公司 | Outdoor unit, method for controlling oil return and air conditioner |
| CN109798644A (en) * | 2019-01-15 | 2019-05-24 | 广东美的暖通设备有限公司 | Control method and air-conditioning system |
| WO2019104967A1 (en) * | 2017-12-01 | 2019-06-06 | 青岛海尔空调电子有限公司 | Multi-connected air conditioning system noise control method and controller |
| CN110296546A (en) * | 2019-07-04 | 2019-10-01 | 宁波奥克斯电气股份有限公司 | Method for controlling oil return, oil return control device and the air conditioner of multi-gang air-conditioner device |
| CN110553339A (en) * | 2019-09-19 | 2019-12-10 | 宁波奥克斯电气股份有限公司 | Heat accumulation prevention control method and device for multi-split air conditioner and air conditioner |
| CN110579010A (en) * | 2019-09-27 | 2019-12-17 | 宁波奥克斯电气股份有限公司 | Control method and control device for electronic expansion valve of multi-split internal machine and air conditioner |
| CN110822615A (en) * | 2018-08-10 | 2020-02-21 | 青岛海尔空调电子有限公司 | Method and device for controlling expansion valve in multi-connected air conditioning system and storage medium |
-
2020
- 2020-04-29 CN CN202010357500.6A patent/CN111503851B/en active Active
Patent Citations (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110167841A1 (en) * | 2004-06-04 | 2011-07-14 | Brasscorp Limited | Compositions and methods for injection of sealants and/or drying agents into air conditioning and refrigeration systems |
| JP4847851B2 (en) * | 2006-12-14 | 2011-12-28 | ヤマハ発動機株式会社 | Multi-connection module type surface mounting apparatus and multi-connection type surface mounting machine system |
| CN104180563A (en) * | 2013-05-27 | 2014-12-03 | 珠海格力电器股份有限公司 | Method for returning oil during heating of multi-online system |
| JP2015222157A (en) * | 2014-05-23 | 2015-12-10 | 株式会社富士通ゼネラル | Air conditioning device |
| CN104833126A (en) * | 2015-03-31 | 2015-08-12 | 广东美的暖通设备有限公司 | Variable refrigerant volume system |
| CN104792076A (en) * | 2015-04-28 | 2015-07-22 | 广东美的暖通设备有限公司 | Three-tube multi-split air-conditioning system oil return or defrosting control method and system thereof |
| CN105864982A (en) * | 2016-04-25 | 2016-08-17 | 广东美的暖通设备有限公司 | Multi-split air conditioner system and control method thereof |
| CN105928059A (en) * | 2016-04-25 | 2016-09-07 | 广东美的暖通设备有限公司 | Multi-online system and control method for heating and throttling element of multi-online system |
| CN205619641U (en) * | 2016-05-05 | 2016-10-05 | 广东志高暖通设备股份有限公司 | Multi -split air conditioning system |
| KR101898331B1 (en) * | 2016-08-19 | 2018-09-12 | 엘지전자 주식회사 | air conditioner |
| CN106352472A (en) * | 2016-08-19 | 2017-01-25 | 广东美的暖通设备有限公司 | Multi-online system and linkage fault detection method thereof |
| CN106766420A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method for heating the anti-hydrops of interior machine |
| CN107860103A (en) * | 2017-10-27 | 2018-03-30 | 广东美的暖通设备有限公司 | The control method of multiple on-line system, device and there is its system |
| WO2019104967A1 (en) * | 2017-12-01 | 2019-06-06 | 青岛海尔空调电子有限公司 | Multi-connected air conditioning system noise control method and controller |
| CN108168138A (en) * | 2018-01-02 | 2018-06-15 | 珠海格力电器股份有限公司 | Outdoor unit, air-conditioning system and control method |
| CN110822615A (en) * | 2018-08-10 | 2020-02-21 | 青岛海尔空调电子有限公司 | Method and device for controlling expansion valve in multi-connected air conditioning system and storage medium |
| CN109386909A (en) * | 2018-10-22 | 2019-02-26 | 广东美的暖通设备有限公司 | Outdoor unit, method for controlling oil return and air conditioner |
| CN109357440A (en) * | 2018-10-26 | 2019-02-19 | 宁波奥克斯电气股份有限公司 | A kind of multi-connected machine heating method for controlling oil return and multi-gang air-conditioner device |
| CN109798644A (en) * | 2019-01-15 | 2019-05-24 | 广东美的暖通设备有限公司 | Control method and air-conditioning system |
| CN110296546A (en) * | 2019-07-04 | 2019-10-01 | 宁波奥克斯电气股份有限公司 | Method for controlling oil return, oil return control device and the air conditioner of multi-gang air-conditioner device |
| CN110553339A (en) * | 2019-09-19 | 2019-12-10 | 宁波奥克斯电气股份有限公司 | Heat accumulation prevention control method and device for multi-split air conditioner and air conditioner |
| CN110579010A (en) * | 2019-09-27 | 2019-12-17 | 宁波奥克斯电气股份有限公司 | Control method and control device for electronic expansion valve of multi-split internal machine and air conditioner |
Non-Patent Citations (1)
| Title |
|---|
| 林成祥; 黄民玉; 胡金彪: "变频多联式空调机组回油问题解决方法探究", 《工业技术创新》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465109A (en) * | 2021-06-29 | 2021-10-01 | 青岛海尔空调电子有限公司 | Low-energy-consumption standby control method, device and medium of multi-split air conditioner |
| CN113465109B (en) * | 2021-06-29 | 2023-06-16 | 青岛海享智科技有限公司 | Low-energy-consumption standby control method and device for multi-split air conditioner and medium |
| CN113669784A (en) * | 2021-07-12 | 2021-11-19 | 浙江中广电器股份有限公司 | Control method for improving oil shortage of compressor during starting of waterless floor heating and triple co-generation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111503851B (en) | 2021-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101917941B1 (en) | Air conditioner and control method thereof | |
| CN111442510B (en) | Multi-split air conditioning system, control method and control device thereof, and storage medium | |
| US9151522B2 (en) | Air conditioner and control method thereof | |
| US20100139312A1 (en) | Refrigeration apparatus | |
| JP4036288B2 (en) | Air conditioner | |
| CN111503851B (en) | Control method and device of multi-split air conditioning system | |
| CN112050399B (en) | Air conditioner | |
| CN107401849B (en) | Multi-split air conditioning system and control method and device of supercooling loop valve body thereof | |
| CN113405243A (en) | Control method of air conditioning system | |
| CN109392304A (en) | Air-conditioning system, air-conditioning method and control device | |
| CN109798644B (en) | Control method and air conditioning system | |
| CN111473496B (en) | Air conditioning system, control method and device thereof and storage medium | |
| CN113959010A (en) | One-driving-multiple refrigerating and heating air conditioner | |
| CN107559953B (en) | Multi-split air conditioning system and control method and device of supercooling loop valve body thereof | |
| JP2508860B2 (en) | Operation control device for air conditioner | |
| KR20190041091A (en) | Air Conditioner | |
| CN113124541A (en) | Method and device for judging reverse connection of expansion valve, controller and air conditioner | |
| KR102459591B1 (en) | Control Method of Air Conditioner | |
| CN213089945U (en) | Air conditioner | |
| CN114151935A (en) | Air conditioning system | |
| CN111322723A (en) | Multi-split air conditioning system, control method and control device thereof, and storage medium | |
| CN107940796B (en) | Multi-split air conditioner system and starting control method of outdoor unit thereof | |
| CN107356009B (en) | Multi-split air conditioning system and low-temperature control method thereof | |
| KR20110118251A (en) | Multi-refrigerating apparatus with variable refrigerants | |
| CN111609479B (en) | Air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |