CN111322723A - Multi-split air conditioning system, control method and control device thereof, and storage medium - Google Patents
Multi-split air conditioning system, control method and control device thereof, and storage medium Download PDFInfo
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- CN111322723A CN111322723A CN202010167405.XA CN202010167405A CN111322723A CN 111322723 A CN111322723 A CN 111322723A CN 202010167405 A CN202010167405 A CN 202010167405A CN 111322723 A CN111322723 A CN 111322723A
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- preset
- conditioning system
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/70—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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
- 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
- F25B49/022—Compressor control arrangements
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Abstract
The invention discloses a multi-split air conditioning system and a control method, a control device and a storage medium thereof, wherein the control method comprises the following steps: detecting that the multi-split air-conditioning system is in a defrosting period, finishing the reversing of the four-way valve for the second time, and controlling the opening of an outdoor unit main valve of the multi-split air-conditioning system to be reduced to a first preset opening; and in the process of controlling the opening of the main valve of the outdoor unit to be reduced to a first preset opening, controlling the frequency of the press to be increased to a preset frequency, and maintaining the preset frequency until the exhaust superheat degree of the multi-split air conditioning system is detected to be increased to a preset value. According to the control method, the frequency of the main valve of the outdoor unit and the press is controlled during defrosting, the risk of oil shortage of the press caused by no exhaust superheat degree of the system for a long time can be avoided, the oil level of the press during defrosting of the system is improved, and therefore the reliability of the operation of the system is guaranteed.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner system, a control method, a control device and a storage medium thereof.
Background
When the multi-split air conditioning system operates in a heating mode, outdoor temperature and humidity meet certain conditions, the outdoor heat exchanger is inevitably frosted, and at the moment, defrosting operation is needed. Common defrosting modes include a reverse-cycle refrigeration defrosting method, a hot-gas bypass defrosting method and a heat storage defrosting method, and the reverse-cycle refrigeration defrosting method is generally adopted in the existing heat pump multi-split air conditioning system. The reverse circulation refrigeration defrosting method is characterized in that a system firstly judges a defrosting condition, then starts a defrosting action when the defrosting condition is met, changes over through a four-way valve, switches a heating operation mode into a refrigeration operation mode, stops an indoor fan and an outdoor fan at the moment, sends a high-temperature gaseous refrigerant of a compressor into an outdoor heat exchanger for defrosting, changes over again through the four-way valve after the defrosting is finished, and continues to circularly and repeatedly operate in a mode of returning to the heating mode.
In the reverse circulation refrigeration defrosting method, a complete defrosting period needs to be completed by two times of four-way valve reversing, and after the system is reversed into a heating mode by the second four-way valve, the liquid level of the gas-liquid separator can be quickly and obviously increased to a larger extent. Meanwhile, the system has a frequency increasing process again, if the frequency control of the main valve of the outdoor unit and the frequency of the press is not appropriate, the system can keep a long time without exhaust superheat degree, the frequency of the press in the period is continuously increased, a large amount of oil is discharged from the press, the risk of oil shortage of the press is possibly caused, and the reliability of the operation of the system is influenced.
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 avoid the risk of oil shortage due to a large amount of oil discharged from a press, and improve the oil level of the press during defrosting by controlling the frequency of an outdoor main valve and the press during defrosting, thereby ensuring the reliability of system operation.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the present invention is to provide a control apparatus for a multi-split air conditioning system.
A fourth object of the present invention is to provide a multi-split air conditioning system.
In order to achieve the above object, a first embodiment of the present invention provides a control method for a multi-split air conditioning system, where the control method includes: detecting that the multi-split air-conditioning system is in a defrosting period, finishing the reversing of the four-way valve for the second time, and controlling the opening of an outdoor unit main valve of the multi-split air-conditioning system to be reduced to a first preset opening; and in the process of controlling the opening of the main valve of the outdoor unit to be reduced to the first preset opening, controlling the frequency of the press to be increased to a preset frequency, and maintaining the preset frequency until the exhaust superheat degree of the multi-split air conditioning system is detected to be increased to a preset value.
According to the control method of the multi-split air-conditioning system, when the multi-split air-conditioning system is detected to be in a defrosting period and the four-way valve reversing is completed for the second time, the opening degree of the main valve of the outdoor unit of the multi-split air-conditioning system is controlled to be reduced to the first preset opening degree, the frequency of the press is controlled to be increased to the preset frequency in the process of controlling the main valve of the outdoor unit to be reduced to the first preset opening degree, and the preset frequency is maintained until the exhaust superheat degree of the multi-split air-conditioning system is detected to be increased to the preset value. Therefore, by controlling the frequency of the main valve of the outdoor unit and the press during defrosting, the control method can avoid the risk of oil shortage of the press caused by no exhaust superheat degree of the system for a long time, improve the oil level of the press during defrosting of the system, and ensure the reliability of the operation of the system.
In addition, the control method of the multi-split air conditioning system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, after controlling the opening degree of the outdoor main valve to decrease to the first preset opening degree, the first preset opening degree is maintained for a first preset time, and after the first preset time, the outdoor main valve is released to allow the opening degree of the outdoor main valve to be freely adjusted.
According to one embodiment of the invention, after the fact that the exhaust superheat degree of the multi-split air conditioning system is increased to a preset value is detected, PI control is carried out on the frequency of the press.
According to an embodiment of the present invention, the controlling the frequency of the press to rise to a preset frequency comprises: and controlling the frequency of the press to rise to the preset frequency according to a preset rate.
In order to achieve the above object, a second aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the method for controlling a multi-split air conditioning system according to the first aspect of the present invention.
According to the computer-readable storage medium of the embodiment of the invention, when the computer program stored on the computer-readable storage medium is executed by the processor, the risk of oil shortage of the press caused by no exhaust superheat degree for a long time of the system can be avoided, and the oil level of the press during defrosting of the system is improved, so that the reliability of the operation of the system is ensured.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides a control device of a multi-split air conditioning system, the control device including: the control system comprises a first control module, a second control module and a control module, wherein the first control module is used for controlling the opening of a main valve of an outdoor unit of the multi-split air-conditioning system to be reduced to a first preset opening when the multi-split air-conditioning system is detected to be in a defrosting period and the second four-way valve reversing is completed; and the second control module is used for controlling the frequency of the press to be increased to a preset frequency in the process of controlling the opening degree of the main valve of the outdoor unit to be reduced to the first preset opening degree, and maintaining the preset frequency until the exhaust superheat degree of the multi-split air-conditioning system is detected to be increased to a preset value.
According to the control device of the multi-split air-conditioning system, when the multi-split air-conditioning system is detected to be in a defrosting period and the reversing of the four-way valve is completed for the second time, the opening degree of the main valve of the outdoor unit of the multi-split air-conditioning system is controlled to be reduced to the first preset opening degree through the first control module, in the process, the frequency of the press is controlled to be increased to the preset frequency through the second control module, and the preset frequency is maintained until the exhaust superheat degree of the multi-split air-conditioning system is detected to be increased to the preset value. Therefore, the control device can avoid the risk of oil shortage of the press caused by no exhaust superheat degree for a long time by controlling the frequency of the main valve of the outdoor unit and the press during defrosting, improve the oil level of the press during defrosting of the system and ensure the reliability of the operation of the system.
In addition, the control device of the multi-split air conditioning system according to the above embodiment of the present invention may further have the following technical features:
according to an embodiment of the invention, the first control module is further configured to: after the opening of the outdoor unit main valve is controlled to be reduced to the first preset opening, maintaining the first preset opening for a first preset time, and after the first preset time, releasing the outdoor unit main valve to enable the opening of the outdoor unit main valve to be freely adjusted.
According to an embodiment of the invention, the second control module is further configured to: and after detecting that the exhaust superheat degree of the multi-split air conditioning system is increased to a preset value, carrying out PI control on the frequency of the press.
According to an embodiment of the present invention, when the second control module controls the frequency of the press to increase to a preset frequency, the second control module is specifically configured to: and controlling the frequency of the press to rise to the preset frequency according to a preset rate.
In order to achieve the above object, a fourth aspect of the present invention provides a multi-split air conditioning system including a control device of the multi-split air conditioning system according to the third aspect of the present invention.
According to the multi-split air conditioning system provided by the embodiment of the invention, the control device of the multi-split air conditioning system controls the frequency of the main valve and the press of the outdoor unit during defrosting, so that the risk of oil shortage of the press caused by no exhaust superheat degree of the system for a long time can be avoided, the oil level of the press of the system during defrosting is improved, and the reliability of the operation of the system is ensured.
Drawings
Fig. 1 is a schematic structural view of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a configuration of a control apparatus of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 4 is a block diagram 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 multi-split air conditioning system, a control method thereof, a control device thereof, and a storage medium according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic configuration diagram of a multi-split air conditioning system according to an embodiment of the present invention. As shown in fig. 1, the multi-split air conditioning system includes an outdoor unit provided with an outdoor main valve EXVA, and a plurality of indoor units (four indoor units are shown in fig. 1: a first indoor unit 1, a second indoor unit 2, a third indoor unit 3, and a fourth indoor unit 4), each provided with a cooling solenoid valve and a heating solenoid valve. Referring to fig. 1, the first indoor unit 1 corresponds to the cooling solenoid valve SVA1 and the heating solenoid valve SVB1, the second indoor unit 2 corresponds to the cooling solenoid valve SVA2 and the heating solenoid valve SVB2, the third indoor unit 3 corresponds to the cooling solenoid valve SVA3 and the heating solenoid valve SVB3, and the fourth indoor unit 4 corresponds to the cooling solenoid valve SVA4 and the heating solenoid valve SVB 4.
The multi-split air conditioning system according to the embodiment of the present invention may be a heat pump multi-split air conditioning system or a heat recovery type multi-split air conditioning system, and referring to fig. 1, the system may be a three-pipe heat recovery type multi-split air conditioning system including an external machine side, an MS (refrigerant flow direction switching device between an external machine and an internal machine) side, and an internal machine side. It can be understood that three main pipes of the three-pipe heating recovery type multi-split air conditioning system are respectively a liquid pipe, a high-pressure air pipe and a low-pressure air pipe from small to large according to the pipe diameter, the liquid pipe and the low-pressure air pipe can be used for the indoor unit (the refrigerating indoor unit) operating in the refrigerating mode, the liquid pipe and the high-pressure air pipe can be used for the indoor unit (the heating indoor unit) operating in the heating mode, the state of a refrigerant flowing in the liquid pipe is a liquid state or a gas-liquid two-phase state refrigerant which is in a high-pressure state after being condensed by a condenser, and the air pipe is selected according to the operating mode of the indoor unit, that is, a refrigerating electromagnetic valve or a heating electromagnetic valve in the MS device is opened according to the.
It should be noted that, two four-way valve switchovers are required to complete a complete defrosting cycle, when the first four-way valve switch is forward (i.e., the second four-way valve switch is backward), that is, the multi-split air conditioning system operates in the heating mode, the high-temperature and high-pressure gaseous refrigerant compressed by the press enters each indoor unit along the high-pressure gas pipe through the opened heating solenoid valves SVB 1-SVB 4, the high-temperature and high-pressure gaseous refrigerant is condensed into high-temperature and high-pressure liquid refrigerant on the inner machine side, the condensed high-temperature and high-pressure liquid refrigerant flows to the main valve EXVA of the outdoor unit along the liquid pipe, and is throttled into low-temperature and low-pressure gas-liquid two-phase refrigerant by the main valve EXVA of the outdoor unit, and enters the outdoor heat exchanger to be evaporated into low.
When the four-way valve is reversed for the first time, the indoor unit is converted into the evaporator by the condenser, the condensate of the original indoor unit can directly return to the gas-liquid separator, meanwhile, during the reversing defrosting, the indoor air outlet comfort is considered, the indoor fan can be in the off state and the forced convection heat transfer stops, the refrigerant flowing to the indoor unit can not be completely evaporated at the moment, so that the liquid refrigerant which is not completely evaporated directly returns to the gas-liquid separator, therefore, the liquid level of the gas-liquid separator can be increased to a certain degree, but the main connecting pipe of the multi-unit machine is a long pipe, and a part of liquid refrigerant can be stored in the main connecting pipe, so that the liquid level of the gas-liquid separator can not be increased greatly after.
After the four-way valve is switched for the first time, the multi-split air-conditioning system is in a refrigerating running state, at the moment, the indoor and outdoor fans stop running, the inner and outer main valves are all opened to the maximum set value (the maximum opening degree which can be borne by the inner and outer main valves in different multi-split air-conditioning systems), high-temperature and high-pressure gaseous refrigerants compressed by the press flow to the outdoor heat exchanger used as a condenser for condensation, then flow to the indoor machine heat exchanger (indoor machine) along the liquid pipe for evaporation, and then flow to the gas-liquid separator along the refrigerating electromagnetic valves SVA 1-SVA 4 to return to the press for recomp.
When the four-way valve is reversed for the second time, the outdoor heat exchanger is changed from the condenser to the evaporator, on one hand, the distance between the outdoor heat exchanger and the gas-liquid separator is short when the outdoor heat exchanger is used as the evaporator, and a large amount of condensate of the outdoor heat exchanger before the four-way valve is reversed can quickly and directly return to the gas-liquid separator, so that the liquid level of the gas-liquid separator can quickly and greatly and obviously rise after the four-way valve is reversed for the; on the other hand, in order to ensure the reliability of the system for reversing the four-way valve, the four-way valve needs to be reversed in a low-frequency state of the press, so that the multi-split air conditioning system has a large frequency rising process after the four-way valve is reversed for the second time, namely, the multi-split air conditioning system is switched back to the heating mode, at this time, if the control of the outdoor unit main valve EXVA and the frequency of the press is improper, the system will have no exhaust superheat degree for a long time, and the continuously rising frequency of the press can cause a large amount of oil discharge of the press, so that. Therefore, after the second four-way valve is switched back to the heating mode in the defrosting process of the multi-split air conditioning system, namely within a period of time after the second four-way valve is switched, the press machine may run in an oil shortage mode, and the running reliability of the system is affected.
Therefore, the embodiment of the invention provides a control method of a multi-split air conditioning system to avoid the risk of oil shortage operation of a press, so that the reliability of the operation of the system is ensured. This will be described below.
Fig. 2 is a flowchart of a control method of a multi-split air conditioning system according to an embodiment of the present invention. As shown in fig. 2, the control method includes:
detecting that the multi-split air-conditioning system is in a defrosting period, finishing the reversing of the four-way valve for the second time, and controlling the opening of an outdoor unit main valve of the multi-split air-conditioning system to be reduced to a first preset opening; and in the process of controlling the opening of the main valve of the outdoor unit to be reduced to a first preset opening, controlling the frequency of the press to be increased to a preset frequency, and maintaining the preset frequency until the exhaust superheat degree of the multi-split air conditioning system is detected to be increased to a preset value.
Specifically, whether the multi-split air-conditioning system is in a defrosting period or not can be detected, the four-way valve reversing for the second time is completed, then when the multi-split air-conditioning system is detected to be in the defrosting period and the four-way valve reversing for the second time is completed, the opening of an outdoor unit main valve of the multi-split air-conditioning system is controlled to be reduced to a smaller first preset opening A from a maximum set value in the defrosting period, so that the pressure difference between an inlet and an outlet of an outdoor heat exchanger is reduced, and the backflow (backflow to the gas-liquid separator) of a large amount of condensate of the outdoor heat exchanger before the four-way valve reversing is buffered, namely, a small amount of condensate in the outdoor heat exchanger flows back to the gas-liquid separator slowly, so that the liquid. At the moment, because the system is switched into a heating mode, a large amount of refrigerants on the low-pressure side (including an outdoor heat exchanger and a gas-liquid separator) can be transferred to the high-pressure side (an indoor unit) by the press, and the refrigerants on the high-pressure side need to flow to the low-pressure side through an outdoor main valve with the opening degree of a first preset value A, so that more discharged liquid of the refrigerants on the low-pressure side is less, namely, less returned refrigerants flow back to the gas-liquid separator, the liquid level of the gas-liquid separator can slowly drop until excessive refrigerants in the gas-liquid separator are discharged, and the multi-split air conditioning system starts to establish exhaust superheat degree. The first preset values a in different multi-split air conditioning systems may be different, and therefore, the first preset values a need to be determined through experiments.
The process of reducing the outdoor unit main valve to the first preset value A requires time, at this time (when the time is not reduced to the first preset value A), a part of a large amount of condensate of the outdoor heat exchanger before the second four-way valve reversing directly and quickly returns to the gas-liquid separator, and correspondingly, the liquid level of the gas-liquid separator quickly and greatly rises until the opening degree of the outdoor unit main valve is reduced to the first preset value A.
When the opening of the main valve of the control outdoor unit is reduced to a first preset opening A, the frequency of the control press is increased to a preset frequency C (middle frequency) from a lower frequency when the four-way valve is reversed, and the press is enabled to maintain the preset frequency C to run. In the frequency increasing process, the liquid level of the gas-liquid separator is high, the system does not have exhaust superheat degree, the oil discharge rate of the press can be continuously increased in the period without the exhaust superheat degree until the gas-liquid separator discharges excessive refrigerants (namely, the opening degree of an outdoor unit main valve is reduced to A), the exhaust superheat degree is established by the multi-split air conditioning system at the moment, when the exhaust superheat degree is increased to a preset value D, the oil discharge rate of the press can be obviously reduced, and the oil shortage risk of the press caused by the fact that the oil discharge of the press is too fast is avoided. It will be appreciated that the preset frequency C is maintained to prevent the frequency of the press from increasing to a high frequency when the superheat of the exhaust gas from the system is not yet established, so that a higher oil discharge rate of the press results in starvation operation of the press.
The preset frequency C can be determined according to the actual requirements of the multi-split air conditioning system, and cannot be too high or too low, if the preset frequency C is too low, the exhaust superheat degree of the system is too long, the corresponding cold air preventing time for the heating inner unit to exit is too long, and if the preset frequency C is too high, the oil discharge rate of the press is rapidly and obviously increased, so that the oil shortage phenomenon of the press occurs during the frequency rising period.
Therefore, by controlling the frequency of the main valve of the outdoor unit and the press during defrosting, the control method can avoid the risk of oil shortage of the press caused by no exhaust superheat degree of the system for a long time, improve the oil level of the press during defrosting of the system, and ensure the reliability of the operation of the system.
In one embodiment of the present invention, after controlling the opening degree of the outdoor main valve to decrease to the first preset opening degree, the first preset opening degree is maintained for a first preset time, and after the first preset time, the outdoor main valve is released to allow the opening degree of the outdoor main valve to be freely adjusted.
Specifically, after the opening degree of the main valve of the outdoor unit is controlled to be reduced to a first preset opening degree A, the first preset opening degree A is maintained for a first preset time B, the gas-liquid separator discharges excessive refrigerants to enable the system to establish the exhaust superheat degree as soon as possible, the main valve of the outdoor unit is released after the first preset time B to enable the opening degree of the main valve of the outdoor unit to be freely adjusted, namely the main valve of the outdoor unit is released to run freely, and at the moment, the main valve of the outdoor unit can be controlled according to double control which gives consideration to the exhaust superheat degree and the evaporation superheat degree of an outdoor heat exchanger, so that the normal operation of the multi-split air.
Therefore, the exhaust superheat degree of the multi-split air conditioning system is established as soon as possible by controlling the opening degree of the outdoor main valve, and the condition that the system does not have the exhaust superheat degree for a long time is avoided.
In one embodiment of the invention, after the exhaust superheat degree of the multi-split air conditioning system is detected to be increased to a preset value, the frequency of the press machine is subjected to PI control.
Specifically, after the exhaust superheat degree of the multi-split air conditioning system is increased to a preset value D, the oil discharge rate of the press can be obviously reduced, the press can be controlled to exit from a preset frequency C, and then PI (proportional integral) control is performed on the frequency of the press, so that the frequency of the press is increased to a target value, and the problem of oil shortage caused by too fast oil discharge of the press is avoided.
In one embodiment of the present invention, controlling the frequency of the press to increase to the preset frequency may include: and controlling the frequency of the press to rise to a preset frequency according to a preset speed.
Specifically, while the opening of the main valve of the outdoor unit is reduced to the first preset value a, the frequency of the press machine is increased, and at this time, the preset rate is controlled to slowly increase the frequency of the press machine to the preset frequency C, and the preset frequency C is maintained to operate. Thereby, a rapid, significant increase in the oil drainage rate of the press is avoided.
In summary, according to the control method of the multi-split air conditioning system in the embodiment of the present invention, when the second four-way valve reversing is completed during the defrosting period, the opening of the main valve of the outdoor unit is controlled to be decreased, and the frequency of the press is controlled to be good, so that the excessive refrigerant in the gas-liquid separator is discharged, the exhaust superheat degree of the system is established as fast as possible, and the control of the frequency of the press is also taken into consideration, so that the risk of oil shortage caused by a large amount of oil discharged from the press can be avoided, the oil level of the press during the defrosting period of the system is improved, and the reliability of the.
The present invention also provides a computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the control method of the multi-split air conditioning system described above.
The computer readable storage medium, when the computer program stored on the computer readable storage medium is executed by the processor, can avoid the risk of oil shortage of the press caused by no exhaust superheat degree for a long time of the system, and improve the oil level of the press during defrosting of the system, thereby ensuring the reliability of the operation of the system.
The present invention also provides a control device of a multi-split air conditioning system, and fig. 3 is a block diagram of the control device of the multi-split air conditioning system according to an embodiment of the present invention.
As shown in fig. 3, the control device 100 of the multi-split air conditioning system includes: a first control module 10 and a second control module 20.
The first control module 10 is configured to control an opening of an outdoor unit main valve EXVA of the multi-split air-conditioning system to decrease to a first preset opening when detecting that the multi-split air-conditioning system is in a defrosting period and finishing a second four-way valve reversing; the second control module 20 is configured to control the frequency of the press to increase to a preset frequency and maintain the preset frequency until detecting that the exhaust superheat degree of the multi-split air conditioning system increases to a preset value in the process of controlling the opening degree of the outdoor unit main valve EXVA to decrease to a first preset opening degree.
Specifically, whether the multi-split air conditioning system is in a defrosting period or not can be detected through the control device 100 of the multi-split air conditioning system, the four-way valve reversing for the second time is completed, then when the multi-split air conditioning system is detected to be in the defrosting period and the four-way valve reversing for the second time is completed, the opening of the main valve of the outdoor unit of the multi-split air conditioning system is controlled by the first control module 10 to be reduced from the maximum set value in the defrosting period to the smaller first preset opening a so as to reduce the pressure difference between the inlet and the outlet of the outdoor heat exchanger, and the backflow (backflow to the gas-liquid separator) of a large amount of condensate of the outdoor heat exchanger before the four-way valve reversing is buffered, that is, a small amount of condensate in the outdoor heat exchanger flows back to the gas-liquid separator slowly, so that. At the moment, because the system is switched into a heating mode, a large amount of refrigerants on the low-pressure side (including an outdoor heat exchanger and a gas-liquid separator) can be transferred to the high-pressure side (an indoor unit) by the press, and the refrigerants on the high-pressure side need to flow to the low-pressure side through an outdoor main valve with the opening degree of a first preset value A, so that more discharged liquid of the refrigerants on the low-pressure side is less, namely, less returned refrigerants flow back to the gas-liquid separator, the liquid level of the gas-liquid separator can slowly drop until excessive refrigerants in the gas-liquid separator are discharged, and the multi-split air conditioning system starts to establish exhaust superheat degree. The first preset values a in different multi-split air conditioning systems may be different, and therefore, the first preset values a need to be determined through experiments.
The process of reducing the outdoor unit main valve to the first preset value A requires time, at the moment, a part of a large amount of condensate of the outdoor heat exchanger before the reversing of the four-way valve for the second time directly and quickly returns to the gas-liquid separator, and correspondingly, the liquid level of the gas-liquid separator can quickly and greatly rise until the opening degree of the outdoor unit main valve is reduced to the first preset value A.
In the process of controlling the opening of the main valve of the outdoor unit to be reduced to the first preset opening a (not reduced to the first preset opening a), the second control module 20 controls the frequency of the press to be increased to a preset frequency C (intermediate frequency) from a lower frequency when the four-way valve is reversed, and the press is enabled to operate at the preset frequency C. In the frequency increasing process, the liquid level of the gas-liquid separator is high, the system does not have exhaust superheat degree, the oil discharge rate of the press can be continuously increased in the period without the exhaust superheat degree until the gas-liquid separator discharges excessive refrigerants (namely, the opening degree of an outdoor unit main valve is reduced to A), the exhaust superheat degree is established by the multi-split air conditioning system at the moment, when the exhaust superheat degree is increased to a preset value D, the oil discharge rate of the press can be obviously reduced, and the oil shortage risk of the press caused by the fact that the oil discharge of the press is too fast is avoided. It will be appreciated that the preset frequency C is maintained to prevent the frequency of the press from increasing to a high frequency when the superheat of the exhaust gas from the system is not yet established, so that a higher oil discharge rate of the press results in starvation operation of the press.
The preset frequency C can be determined according to the actual requirements of the multi-split air conditioning system, and cannot be too high or too low, if the preset frequency C is too low, the exhaust superheat degree of the system is too long, the corresponding cold air preventing time for the heating inner unit to exit is too long, and if the preset frequency C is too high, the oil discharge rate of the press is rapidly and obviously increased, so that the oil shortage phenomenon of the press occurs when the exhaust superheat degree is not established in the frequency raising period.
Therefore, the control device can avoid the risk of oil shortage of the press caused by no exhaust superheat degree for a long time by controlling the frequency of the main valve of the outdoor unit and the press during defrosting, improve the oil level of the press during defrosting of the system and ensure the reliability of the operation of the system.
In one embodiment of the present invention, the first control module 10 is further operable to: after the opening of the outdoor main valve EXVA is controlled to be reduced to the first preset opening, the first preset opening is maintained for a first preset time, and after the first preset time, the outdoor main valve is released to enable the opening of the outdoor main valve to be freely adjusted.
Specifically, after controlling the opening degree of the outdoor unit main valve to decrease to the first preset opening degree a, the first control module 10 maintains the first preset opening degree a for a first preset time B, so that the gas-liquid separator discharges excessive refrigerant to enable the system to establish the exhaust superheat degree as soon as possible, and releases the outdoor unit main valve after the first preset time B to enable the opening degree of the outdoor unit main valve to be freely adjusted, that is, the outdoor unit main valve is released to run freely, and at this time, the outdoor unit main valve can be controlled according to double control which takes account of the exhaust superheat degree and the evaporation superheat degree of the outdoor heat exchanger, so as to ensure the normal operation of the multi-split air conditioning system.
Therefore, the exhaust superheat degree of the multi-split air conditioning system is established as soon as possible by controlling the opening degree of the outdoor main valve, and the condition that the system does not have the exhaust superheat degree for a long time is avoided.
In one embodiment of the present invention, the second control module 20 is further operable to: and after detecting that the exhaust superheat degree of the multi-split air conditioning system is increased to a preset value, performing PI control on the frequency of the press.
Specifically, after the exhaust superheat degree of the multi-split air conditioning system is increased to a preset value D, the oil discharge rate of the press can be obviously reduced, at the moment, the second control module 20 can control the press to exit from the preset frequency C, and then PI (Proportional Integral) control is performed on the frequency of the press, so that the frequency of the press is increased to a target value, and the problem of oil shortage caused by too fast oil discharge of the press is avoided.
In an embodiment of the present invention, when the frequency of the control press is increased to the preset frequency, the second control module 20 may be specifically configured to: and controlling the frequency of the press to rise to a preset frequency according to a preset speed.
Specifically, while the first control module 10 reduces the opening of the outdoor main valve to the first preset value a, the press frequency is increased, and at this time, the second control module 20 needs to control the preset rate to slowly increase the press frequency to the preset frequency C and maintain the preset frequency C to operate. Thereby, a rapid, significant increase in the oil drainage rate of the press is avoided.
In summary, according to the control method of the multi-split air conditioning system in the embodiment of the present invention, when the second four-way valve reversing is completed during the defrosting period, the opening of the main valve of the outdoor unit is controlled to be decreased, and the frequency of the press is controlled to be good, so that the excessive refrigerant in the gas-liquid separator is discharged, the exhaust superheat degree of the system is established as fast as possible, and the control of the frequency of the press is also taken into consideration, so that the risk of oil shortage caused by a large amount of oil discharged from the press can be avoided, the oil level of the press during the defrosting period of the system is improved, and the reliability of the.
Fig. 4 is a block diagram of a multi-split air conditioning system according to an embodiment of the present invention. As shown in fig. 4, the multi-split air conditioning system 1000 includes the control device 100 of the multi-split air conditioning system of the above embodiment.
According to the multi-split air conditioning system provided by the embodiment of the invention, the control device of the multi-split air conditioning system provided by the embodiment of the invention controls the frequency of the main valve of the outdoor unit and the press during defrosting, so that the risk of oil shortage of the press caused by no exhaust superheat degree of the system for a long time can be avoided, the oil level of the press during defrosting of the system is improved, and the reliability of the operation of the system is ensured.
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.
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.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
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. 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.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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.
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, the control method comprising:
detecting that the multi-split air-conditioning system is in a defrosting period, finishing the reversing of the four-way valve for the second time, and controlling the opening of an outdoor unit main valve of the multi-split air-conditioning system to be reduced to a first preset opening; and
and in the process of controlling the opening of the main valve of the outdoor unit to be reduced to the first preset opening, controlling the frequency of the press to be increased to a preset frequency, and maintaining the preset frequency until the exhaust superheat degree of the multi-split air conditioning system is detected to be increased to a preset value.
2. The method of claim 1, wherein the first preset opening degree is maintained for a first preset time after controlling the opening degree of the outdoor main valves to be decreased to the first preset opening degree, and the outdoor main valves are released to allow the opening degree of the outdoor main valves to be freely adjusted after the first preset time.
3. The control method of a multi-split air conditioning system as set forth in claim 1, wherein the frequency of the press is PI-controlled after detecting that the degree of superheat of exhaust air of the multi-split air conditioning system rises to a preset value.
4. The method of controlling a multi-split air conditioning system as set forth in claim 1, wherein the controlling the frequency of the press to be increased to a preset frequency comprises:
and controlling the frequency of the press to rise to the preset frequency according to a preset rate.
5. A computer-readable storage medium having a computer program stored thereon, wherein the computer 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 4.
6. A control device of a multi-split air conditioning system, comprising:
the control system comprises a first control module, a second control module and a control module, wherein the first control module is used for controlling the opening of a main valve of an outdoor unit of the multi-split air-conditioning system to be reduced to a first preset opening when the multi-split air-conditioning system is detected to be in a defrosting period and the second four-way valve reversing is completed; and
and the second control module is used for controlling the frequency of the press to be increased to a preset frequency and maintaining the preset frequency in the process of controlling the opening of the main valve of the outdoor unit to be reduced to the first preset opening until the exhaust superheat degree of the multi-split air-conditioning system is detected to be increased to a preset value.
7. The control method of a multi-split air conditioning system as set forth in claim 6, wherein the first control module is further configured to:
after the opening of the outdoor unit main valve is controlled to be reduced to the first preset opening, the first preset opening is maintained for a first preset time, and after the first preset time, the outdoor unit main valve is released to enable the opening of the outdoor unit main valve to be freely adjusted.
8. The control method of a multi-split air conditioning system as set forth in claim 6, wherein the second control module is further configured to:
and after detecting that the exhaust superheat degree of the multi-split air conditioning system is increased to a preset value, carrying out PI control on the frequency of the press.
9. The control method of a multi-split air conditioning system as claimed in claim 6, wherein the second control module, when controlling the frequency of the press to rise to a preset frequency, is specifically configured to:
and controlling the frequency of the press to rise to the preset frequency according to a preset rate.
10. A multi-split air conditioning system comprising the control device of the multi-split air conditioning system as set forth in any one of claims 6 to 9.
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