CN108716784B - Multi-split system and control method thereof - Google Patents

Multi-split system and control method thereof Download PDF

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Publication number
CN108716784B
CN108716784B CN201810579677.3A CN201810579677A CN108716784B CN 108716784 B CN108716784 B CN 108716784B CN 201810579677 A CN201810579677 A CN 201810579677A CN 108716784 B CN108716784 B CN 108716784B
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Prior art keywords
refrigerant
temperature
throttle valve
heat exchanger
gas
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CN108716784A (en
Inventor
卜其辉
许永锋
梁伯启
李宏伟
吴孔祥
董世龙
吴晓鸿
张宇
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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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
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention discloses a multi-split system and a control method thereof, wherein the multi-split system comprises an outdoor unit, a plurality of indoor units and a refrigerant quantity adjusting device, wherein the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and an outdoor throttle valve; the refrigerant quantity adjusting device comprises an intermediate heat exchanger, an adjustable throttle valve, an electromagnetic valve and a gas-liquid separator, and is used for controlling the opening of the electromagnetic valve and adjusting the opening of the adjustable throttle valve to enable the refrigerant quantity to reach a proper state when the refrigerant quantity of the multi-split air-conditioning system is too much or too little. According to the multi-split system provided by the embodiment of the invention, the energy efficiency of system operation can be improved, the problem of liquid impact caused by liquid return of the compressor can be avoided, and the reliability of system operation is improved.

Description

Multi-split system and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner system and a control method of the multi-split air conditioner system.
Background
Generally, a multi-split air-conditioning system is provided with a plurality of indoor units by an outdoor unit, so that the amount of refrigerant required by the actual operation of the system is changed under different working conditions and different loads, and the refrigerant filling amount of the multi-split air-conditioning system is determined according to a full load design value in the installation process, but the actual refrigerant circulation amount cannot be changed according to the actual load in the operation process of the system, so that the refrigerant amount of the system is too much or too little, the energy efficiency of the system operation is reduced, liquid slugging caused by liquid returning of a compressor is possibly caused, and the reliability of the system operation is reduced.
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, an object of the present invention is to provide a multi-split system, which can control the solenoid valve to open and adjust the opening of the adjustable throttle valve to adjust the refrigerant quantity to a proper state when the refrigerant quantity of the multi-split system is too large or too small, thereby improving the energy efficiency of the system operation, avoiding the liquid impact problem caused by the liquid return of the compressor, and improving the reliability of the system operation.
Another object of the present invention is to provide a method for controlling a multi-split system.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a multi-split system, including an outdoor unit, a plurality of indoor units, and a refrigerant amount adjusting device, where the outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor throttle valve, a first port of the compressor is connected to a first port of the four-way valve, a second port of the four-way valve is connected to a first end of the outdoor heat exchanger, a second end of the outdoor heat exchanger is connected to a first end of the outdoor throttle valve, and a fourth port of the four-way valve is connected to a gas-side stop valve; the refrigerant quantity adjusting device comprises an intermediate heat exchanger, an adjustable throttle valve, an electromagnetic valve and a gas-liquid separator, wherein the first end of a first heat exchange flow path of the intermediate heat exchanger is connected with the second end of the outdoor throttle valve, the second end of the first heat exchange flow path of the intermediate heat exchanger is respectively connected with a liquid side stop valve and the first end of the adjustable throttle valve, the first end of a second heat exchange flow path of the intermediate heat exchanger is respectively connected with a second port of the compressor and the first end of the electromagnetic valve, the second end of the second heat exchange flow path of the intermediate heat exchanger is connected with the second end of the adjustable throttle valve, the second end of the electromagnetic valve is respectively connected with a third connector of the four-way valve and the first end of the gas-liquid separator, and the second end of the gas-liquid separator is connected with the third port; the refrigerant quantity adjusting device is used for controlling the electromagnetic valve to be opened and adjusting the opening of the adjustable throttle valve simultaneously when the refrigerant quantity of the multi-split air conditioning system is too much or too little so as to enable the refrigerant quantity to reach a proper state.
According to the multi-split air-conditioning system provided by the embodiment of the invention, the refrigerant quantity adjusting device comprising the intermediate heat exchanger, the adjustable throttle valve, the electromagnetic valve and the gas-liquid separator is additionally arranged, so that when the refrigerant quantity of the multi-split air-conditioning system is too much or too little, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is adjusted at the same time, so that the refrigerant quantity reaches a proper state, the energy efficiency of system operation can be improved, the liquid impact problem caused by liquid return of the compressor can be avoided, and the reliability of system operation is improved.
In addition, the multi-split system proposed according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, when the multi-split air conditioning system operates in a cooling or heating mode, wherein when the refrigerant quantity is excessive, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is simultaneously adjusted to be larger so as to store the refrigerant through the gas-liquid separator; when the amount of the refrigerant is too small, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is reduced at the same time, so that the refrigerant in the gas-liquid separator is correspondingly added into a refrigeration or heating cycle.
According to an embodiment of the present invention, the increasing the opening degree of the adjustable throttle valve includes: acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; adjusting the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; the reducing the opening degree of the adjustable throttle valve comprises the following steps: acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; and carrying out reduction control on the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger.
According to an embodiment of the present invention, when the discharge pressure of the compressor is greater than a first preset discharge pressure and the discharge temperature is less than a first preset discharge temperature, it is determined that the refrigerant amount is excessive.
According to an embodiment of the present invention, when the discharge pressure of the compressor is less than a second preset discharge pressure and the discharge temperature is greater than a second preset discharge temperature, it is determined that the refrigerant quantity is too small, where the second preset discharge pressure is less than the first preset discharge pressure and the second preset discharge temperature is greater than the first preset discharge temperature.
In order to achieve the above object, an embodiment of another aspect of the present invention provides a method for controlling a multi-split system, including: judging the refrigerant quantity of the multi-split system; and if the refrigerant quantity of the multi-split air-conditioning system is too much or too little, controlling the opening of the electromagnetic valve, and simultaneously adjusting the opening of the adjustable throttle valve to enable the refrigerant quantity to reach a proper state.
According to the control method of the multi-split system provided by the embodiment of the invention, the refrigerant quantity of the multi-split system is judged, the solenoid valve is controlled to be opened when the refrigerant quantity of the multi-split system is too much or too little, and the opening degree of the adjustable throttle valve is adjusted at the same time, so that the refrigerant quantity reaches a proper state, the energy efficiency of system operation can be improved, the liquid impact problem caused by liquid return of a compressor can be avoided, and the reliability of system operation is improved.
In addition, the control method of the multi-split system proposed by the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, when the multi-split air conditioning system operates in a cooling or heating mode, wherein when the refrigerant quantity is excessive, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is simultaneously adjusted to be larger so as to store the refrigerant through the gas-liquid separator; when the amount of the refrigerant is too small, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is reduced at the same time, so that the refrigerant in the gas-liquid separator is correspondingly added into a refrigeration or heating cycle.
According to an embodiment of the present invention, the increasing the opening degree of the adjustable throttle valve includes: acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; adjusting the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; the reducing the opening degree of the adjustable throttle valve comprises the following steps: acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; and carrying out reduction control on the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger.
According to an embodiment of the present invention, the method for controlling a multiple split air conditioner system further includes: and when the exhaust pressure of the compressor is greater than the first preset exhaust pressure and the exhaust temperature is less than the first preset exhaust temperature, judging that the refrigerant quantity is excessive.
According to an embodiment of the present invention, the method for controlling a multiple split air conditioner system further includes: and when the exhaust pressure of the compressor is smaller than a second preset exhaust pressure and the exhaust temperature is greater than a second preset exhaust temperature, judging that the refrigerant quantity is too small, wherein the second preset exhaust pressure is smaller than the first preset exhaust pressure, and the second preset exhaust temperature is greater than the first preset exhaust temperature.
Drawings
Fig. 1 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention;
fig. 2 is a refrigerant flow diagram when a multi-split system according to an embodiment of the present invention operates in a cooling mode and the amount of refrigerant is appropriate;
fig. 3 is a refrigerant flow diagram when a multi-split system according to an embodiment of the present invention operates in a cooling mode and an amount of refrigerant is excessive or insufficient;
fig. 4 is a refrigerant flow diagram when a multi-split system operates in a heating mode and a refrigerant quantity is appropriate according to an embodiment of the present invention;
fig. 5 is a refrigerant flow diagram when a multi-split system operates in a heating mode and an excessive or insufficient amount of refrigerant is present according to an embodiment of the present invention; and
fig. 6 is a flowchart of a control method of a multi-split 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.
The multi-split system and the control method of the multi-split system according to the embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a multi-split system according to an embodiment of the present invention. As shown in fig. 1, the multi-split system may include: an outdoor unit 10, a plurality of indoor units 20, and a refrigerant amount adjusting device 30.
The indoor units 20 may include a first indoor heat exchanger 21, a second indoor heat exchanger 22, a first indoor throttle 23, and a second indoor throttle 24, the outdoor unit 10 may include a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, and an outdoor throttle 14, a first port of the compressor 11 is connected to a first port a of the four-way valve 12, a second port b of the four-way valve 12 is connected to a first end of the outdoor heat exchanger 13, a second end of the outdoor heat exchanger 13 is connected to a first end of the outdoor throttle 14, and a fourth port d of the four-way valve 12 is connected to a first end of the air-side cut-off valve 40. The second end of the gas side stop valve 40 is connected to the first end of the first indoor heat exchanger 21 and the first end of the second indoor heat exchanger 22, respectively, and the second end of the first indoor heat exchanger 21 and the second end of the second indoor heat exchanger 22 are connected to the second end of the liquid side stop valve 50 through the corresponding first indoor throttle valve 23 and the second indoor throttle valve 24, respectively.
The refrigerant amount adjusting device 30 may include an intermediate heat exchanger 31, an adjustable throttle valve 32, a solenoid valve 33, and a gas-liquid separator 34, wherein a first end of a first heat exchange flow path of the intermediate heat exchanger 31 is connected to a second end of the outdoor throttle valve 14, a second end of the first heat exchange flow path of the intermediate heat exchanger 31 is connected to a first end of the liquid side stop valve 50 and a first end of the adjustable throttle valve 32, respectively, a first end of a second heat exchange flow path of the intermediate heat exchanger 31 is connected to a second port of the compressor 11 and a first end of the solenoid valve 33, a second end of the second heat exchange flow path of the intermediate heat exchanger 31 is connected to a second end of the adjustable throttle valve 32, a second end of the solenoid valve 33 is connected to a third port c of the four-way valve 12 and a first end of the gas-liquid separator 34, respectively.
The refrigerant amount adjusting device 30 is configured to open the solenoid valve 33 and adjust the opening of the adjustable throttle valve 32 to adjust the refrigerant amount to a suitable state when the refrigerant amount of the multi-split air conditioning system is excessive or insufficient.
That is to say, when the refrigerant quantity of the multi-split air-conditioning system is too much or too little, the refrigerant quantity of the system needs to be adjusted, at this time, the control solenoid valve 33 is in an open state, and the opening degree of the adjustable throttle valve 32 is adjusted and controlled to realize the storage and release of the refrigerant, so that the actual circulation quantity of the refrigerant can be adjusted to enable the actual circulation quantity of the refrigerant to reach a proper state, thereby not only improving the energy efficiency of the system operation, but also avoiding the liquid impact problem caused by the liquid return of the compressor, and improving the reliability of the system operation.
According to an embodiment of the present invention, when the multi-split system operates in a cooling or heating mode, in which when the amount of refrigerant is excessive, the solenoid valve 33 is controlled to be opened while the opening degree of the adjustable flow valve 32 is adjusted to be large to store the refrigerant through the gas-liquid separator 34; when the refrigerant amount is too small, the electromagnetic valve 33 is controlled to be opened, and the opening degree of the adjustable throttle valve 32 is adjusted to be small, so that the refrigerant in the gas-liquid separator 34 is correspondingly added into the refrigeration or heating cycle.
In an embodiment of the present invention, the increasing the opening of the adjustable flow valve 32 may include: obtaining the temperature of the second end of the gas-liquid separator 34 and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger 31; the opening degree of the adjustable throttle valve 32 is controlled to be increased in accordance with the acquired temperature of the second end of the gas-liquid separator 34 and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger 31. Reducing the opening of the adjustable throttle 32 may include: obtaining the temperature of the second end of the gas-liquid separator 34 and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger 31; the opening degree of the adjustable throttle valve 32 is controlled to be reduced in accordance with the acquired temperature at the second end of the gas-liquid separator 34 and the acquired temperature at the first end of the second heat exchange flow path of the intermediate heat exchanger 31.
Specifically, when the multi-split system is operated in the cooling mode, the following may occur:
the first method comprises the following steps: when the amount of refrigerant is appropriate, the control solenoid valve 33 is closed, and the refrigerant circulates as shown by the arrow direction in fig. 2, and the refrigerant circulation amount is not adjusted.
And the second method comprises the following steps: when the amount of the refrigerant is excessive, the solenoid valve 33 is controlled to be opened, and the opening degree of the adjustable throttle valve 32 is adjusted to be large so that the refrigerant is stored in the gas-liquid separator 34, and the refrigerant circulates as shown by the arrow direction in fig. 3. Specifically, when the refrigerant quantity is excessive, the electromagnetic valve 33 is controlled to be opened, the temperature T35 at the second end of the gas-liquid separator 34 is obtained through the temperature sensor 35 arranged at the second end of the gas-liquid separator 34, and the temperature T36 at the first end of the second heat exchange flow path of the intermediate heat exchanger 31 is obtained through the temperature sensor 36 arranged at the first end of the second heat exchange flow path of the intermediate heat exchanger 31, if T35 is greater than T36, the liquid refrigerant in the gas-liquid two-phase refrigerant in the gas-liquid separator 34 is evaporated into a gas refrigerant to participate in the refrigeration cycle, at the moment, the opening degree of the adjustable throttle valve 32 is controlled to be increased until T35 is less than or equal to T36, and meanwhile, the T35 is ensured to have a superheat degree, so that a part of the liquid refrigerant supercooled by the intermediate heat exchanger 31 passes through the.
And the third is that: when the amount of refrigerant is too small, the solenoid valve 33 is controlled to open, and the opening of the adjustable throttle valve 32 is adjusted to decrease the refrigerant in the gas-liquid separator 34 to be fed into the refrigeration cycle, the cycle of the refrigerant being as shown by the arrow direction in fig. 3. Specifically, when the refrigerant amount is too small, the electromagnetic valve 33 is controlled to be opened, the temperature T35 at the second end of the gas-liquid separator 34 is obtained through the temperature sensor 35 arranged at the second end, and the temperature T36 at the first end of the second heat exchange flow path of the intermediate heat exchanger 31 is obtained through the temperature sensor 36 arranged at the first end of the second heat exchange flow path of the intermediate heat exchanger 31, if T35 is less than or equal to T36, the gaseous refrigerant in the gas-liquid two-phase refrigerant in the gas-liquid separator 34 is condensed into the liquid refrigerant to be stored therein, and at this time, the opening degree of the adjustable throttle valve 32 is controlled to be reduced until T35 is greater than T36, so that the liquid refrigerant in the gas-liquid two-phase refrigerant in.
When the multi-split system is operating in heating mode, the following may also occur:
the first method comprises the following steps: when the amount of refrigerant is appropriate, the control solenoid valve 33 is closed, and the refrigerant circulates as shown by the arrow direction in fig. 4, and the refrigerant circulation amount is not adjusted.
And the second method comprises the following steps: when the amount of refrigerant is excessive, the solenoid valve 33 is controlled to be opened and the opening degree of the adjustable throttle valve 32 is increased so that the refrigerant is stored in the gas-liquid separator 34, and the refrigerant circulates as shown by the arrow direction in fig. 5. Specifically, when the refrigerant quantity is excessive, the electromagnetic valve 33 is controlled to be opened, the temperature T35 at the second end of the gas-liquid separator 34 is obtained through the temperature sensor 35 arranged at the second end of the gas-liquid separator 34, and the temperature T36 at the first end of the second heat exchange flow path of the intermediate heat exchanger 31 is obtained through the temperature sensor 36 arranged at the first end of the second heat exchange flow path of the intermediate heat exchanger 31, if T35 is greater than T36, the liquid refrigerant in the gas-liquid two-phase refrigerant in the gas-liquid separator 34 is evaporated into a gas refrigerant to participate in a heating cycle, at the moment, the opening degree of the adjustable throttle valve 32 is controlled to be increased until T35 is less than or equal to T36, and the T35 is ensured to have a superheat degree, so that a part of the liquid refrigerant after heat exchange by the first indoor heat exchanger 21 and the second indoor heat exchanger 22 passes through the adjustable throttle.
And the third is that: when the amount of refrigerant is too small, the solenoid valve 33 is controlled to open and the opening of the variable throttle valve 32 is adjusted to be small, so that the refrigerant in the gas-liquid separator 34 is fed into the heating cycle, and the cycle of the refrigerant is shown by the arrow direction in fig. 5. Specifically, when the refrigerant amount is too small, the electromagnetic valve 33 is controlled to be opened, the temperature T35 at the second end of the gas-liquid separator 34 is obtained through the temperature sensor 35 arranged at the second end, and the temperature T36 at the first end of the second heat exchange flow path of the intermediate heat exchanger 31 is obtained through the temperature sensor 36 arranged at the first end of the second heat exchange flow path of the intermediate heat exchanger 31, if T35 is less than or equal to T36, the gaseous refrigerant in the gas-liquid two-phase refrigerant in the gas-liquid separator 34 is condensed into the liquid refrigerant to be stored therein, and at this time, the opening degree of the adjustable throttle valve 32 is controlled to be reduced until T35 is greater than T36, so that the liquid refrigerant in the gas-liquid two-phase refrigerant in.
According to an embodiment of the present invention, when the discharge pressure of the compressor is greater than the first preset discharge pressure and the discharge temperature is less than the first preset discharge temperature, it is determined that the refrigerant amount is excessive. The first preset exhaust pressure and the first preset exhaust temperature can be set according to actual conditions.
According to an embodiment of the present invention, when the discharge pressure of the compressor is less than the second preset discharge pressure and the discharge temperature is greater than the second preset discharge temperature, it is determined that the refrigerant amount is too small. The second preset exhaust pressure and the second preset exhaust temperature can be set according to actual conditions.
Specifically, during the operation of the multi-split air conditioning system in the cooling or heating mode, the discharge pressure P16 at the first port of the compressor 11 is obtained in real time through the pressure sensor 16, and the discharge temperature T15 at the first port of the compressor 11 is obtained in real time through the temperature sensor 15. Then, the refrigerant quantity is judged according to the magnitude relation between P16 and the first preset exhaust pressure P1 and the second preset exhaust pressure P2 and the magnitude relation between T15 and the first preset exhaust temperature T1 and the second preset exhaust temperature T2. If P16 is more than P1 and T15 is less than T1, judging that the refrigerant amount is excessive; if P16 is less than P2 and T15 is more than T2, judging that the refrigerant quantity is too small; the refrigerant quantity is judged to be appropriate if P2 is not less than P16 not less than P1 and T1 is not less than T15 not less than T2.
When the refrigerant quantity of the multi-split air-conditioning system is too much or too little and needs to be adjusted, the opening degree of the adjustable throttle valve 32 is adjusted through opening and closing the electromagnetic valve 33, so that the storage and the release of the refrigerant are realized, the actual circulation quantity of the refrigerant can be adjusted, and the actual circulation quantity of the refrigerant reaches a proper state, so that the energy efficiency of the system operation can be improved, the liquid impact problem caused by liquid return of a compressor can be avoided, and the reliability of the system operation is improved.
It should be noted that, in other embodiments of the present invention, it may also be determined whether the refrigerant amount is too much or too little according to the load of the operation of the multi-split air-conditioning system, where when the load of the operation of the multi-split air-conditioning system is reduced, it is determined that the refrigerant amount is too much; when the load of the multi-split system is increased, judging that the refrigerant quantity is too small; and when the load of the multi-split system is not changed, judging that the refrigerant quantity is appropriate.
In summary, according to the multi-split air-conditioning system provided by the embodiment of the invention, by adding the refrigerant quantity adjusting device including the intermediate heat exchanger, the adjustable throttle valve, the solenoid valve and the gas-liquid separator, when the refrigerant quantity of the multi-split air-conditioning system is too large or too small, the solenoid valve is controlled to be opened, and the opening degree of the adjustable throttle valve is adjusted at the same time, so that the refrigerant quantity reaches a proper state, thereby not only improving the energy efficiency of system operation, but also avoiding the liquid impact problem caused by liquid return of the compressor, and improving the reliability of system operation.
Fig. 6 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention. As shown in fig. 6, the control method of the multi-split system may include the steps of:
and S1, judging the refrigerant quantity of the multi-split system.
And S2, if the refrigerant quantity of the multi-split air-conditioning system is too much or too little, controlling the electromagnetic valve to be opened, and simultaneously adjusting the opening of the adjustable throttle valve to enable the refrigerant quantity to reach a proper state.
According to an embodiment of the invention, when the multi-split air conditioning system operates in a cooling or heating mode, wherein when the refrigerant quantity is excessive, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is simultaneously adjusted to be larger so as to store the refrigerant through the gas-liquid separator; when the amount of the refrigerant is too small, the electromagnetic valve is controlled to be opened, and the opening degree of the adjustable throttle valve is reduced at the same time, so that the refrigerant in the gas-liquid separator is correspondingly added into a refrigeration or heating cycle.
According to an embodiment of the present invention, the increasing the opening degree of the adjustable throttle valve includes: acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; adjusting the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; the reducing the opening degree of the adjustable throttle valve comprises the following steps: acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger; and carrying out reduction control on the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger.
According to an embodiment of the present invention, the method for controlling a multiple split air conditioner system further includes: and when the exhaust pressure of the compressor is greater than the first preset exhaust pressure and the exhaust temperature is less than the first preset exhaust temperature, judging that the refrigerant quantity is excessive.
According to an embodiment of the present invention, the method for controlling a multiple split air conditioner system further includes: and when the exhaust pressure of the compressor is smaller than a second preset exhaust pressure and the exhaust temperature is greater than a second preset exhaust temperature, judging that the refrigerant quantity is too small, wherein the second preset exhaust pressure is smaller than the first preset exhaust pressure, and the second preset exhaust temperature is greater than the first preset exhaust temperature.
It should be noted that details that are not disclosed in the control method of the multi-split air-conditioning system according to the embodiment of the present invention refer to details that are disclosed in 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 method of the multi-split system provided by the embodiment of the invention, the refrigerant quantity of the multi-split system is judged, the solenoid valve is controlled to be opened when the refrigerant quantity of the multi-split system is too much or too little, and the opening degree of the adjustable throttle valve is adjusted at the same time, so that the refrigerant quantity reaches a proper state, the energy efficiency of system operation can be improved, the liquid impact problem caused by liquid return of a compressor can be avoided, and the reliability of system operation is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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 (6)

1. A multi-split system is characterized by comprising an outdoor unit, a plurality of indoor units and a refrigerant quantity adjusting device, wherein,
the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and an outdoor throttle valve, wherein a first port of the compressor is connected with a first interface of the four-way valve, a second interface of the four-way valve is connected with a first end of the outdoor heat exchanger, a second end of the outdoor heat exchanger is connected with a first end of the outdoor throttle valve, and a fourth interface of the four-way valve is connected with an air side stop valve;
the refrigerant quantity adjusting device comprises an intermediate heat exchanger, an adjustable throttle valve, an electromagnetic valve and a gas-liquid separator, wherein the first end of a first heat exchange flow path of the intermediate heat exchanger is connected with the second end of the outdoor throttle valve, the second end of the first heat exchange flow path of the intermediate heat exchanger is respectively connected with a liquid side stop valve and the first end of the adjustable throttle valve, the first end of a second heat exchange flow path of the intermediate heat exchanger is respectively connected with a second port of the compressor and the first end of the electromagnetic valve, the second end of the second heat exchange flow path of the intermediate heat exchanger is connected with the second end of the adjustable throttle valve, the second end of the electromagnetic valve is respectively connected with a third connector of the four-way valve and the first end of the gas-liquid separator, and the second end of the gas-liquid separator is connected with the third port;
the refrigerant quantity adjusting device is used for controlling the electromagnetic valve to be opened and adjusting the opening of the adjustable throttle valve simultaneously when the refrigerant quantity of the multi-split air conditioning system is too much or too little so as to enable the refrigerant quantity to reach a proper state;
wherein, when the multi-split air conditioning system operates in a cooling or heating mode, wherein,
when the amount of the refrigerant is excessive, controlling the electromagnetic valve to be opened, and simultaneously increasing the opening degree of the adjustable throttle valve so as to store the refrigerant through the gas-liquid separator;
when the amount of the refrigerant is too small, controlling the electromagnetic valve to be opened, and simultaneously reducing the opening degree of the adjustable throttle valve so as to enable the refrigerant in the gas-liquid separator to be correspondingly added into a refrigeration or heating cycle;
wherein the increasing the opening degree of the adjustable throttle valve includes:
acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger;
adjusting the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger;
the reducing the opening degree of the adjustable throttle valve comprises the following steps:
acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger;
and carrying out reduction control on the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger.
2. The multi-split system as claimed in claim 1, further comprising:
and when the exhaust pressure of the compressor is greater than a first preset exhaust pressure and the exhaust temperature is less than a first preset exhaust temperature, judging that the refrigerant quantity is excessive.
3. The multi-split system as claimed in claim 1, further comprising:
and when the exhaust pressure of the compressor is less than a second preset exhaust pressure and the exhaust temperature is greater than a second preset exhaust temperature, judging that the refrigerant quantity is too small, wherein the second preset exhaust pressure is less than the first preset exhaust pressure, and the second preset exhaust temperature is greater than the first preset exhaust temperature.
4. A control method of a multi-split system as set forth in any one of claims 1 to 3, comprising the steps of:
judging the refrigerant quantity of the multi-split system;
if the refrigerant quantity of the multi-split air-conditioning system is too much or too little, controlling the electromagnetic valve to open, and simultaneously adjusting the opening of the adjustable throttle valve to enable the refrigerant quantity to reach a proper state;
wherein, when the multi-split air conditioning system operates in a cooling or heating mode, wherein,
when the amount of the refrigerant is excessive, controlling the electromagnetic valve to be opened, and simultaneously increasing the opening degree of the adjustable throttle valve so as to store the refrigerant through the gas-liquid separator;
when the amount of the refrigerant is too small, controlling the electromagnetic valve to be opened, and simultaneously reducing the opening degree of the adjustable throttle valve so as to enable the refrigerant in the gas-liquid separator to be correspondingly added into a refrigeration or heating cycle;
wherein the increasing the opening degree of the adjustable throttle valve includes:
acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger;
adjusting the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger;
the reducing the opening degree of the adjustable throttle valve comprises the following steps:
acquiring the temperature of the second end of the gas-liquid separator and the temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger;
and carrying out reduction control on the opening degree of the adjustable throttle valve according to the acquired temperature of the second end of the gas-liquid separator and the acquired temperature of the first end of the second heat exchange flow path of the intermediate heat exchanger.
5. The method of controlling a multi-split system as set forth in claim 4, further comprising:
and when the exhaust pressure of the compressor is greater than the first preset exhaust pressure and the exhaust temperature is less than the first preset exhaust temperature, judging that the refrigerant quantity is excessive.
6. The method of controlling a multi-split system as set forth in claim 4, further comprising:
and when the exhaust pressure of the compressor is less than a second preset exhaust pressure and the exhaust temperature is greater than a second preset exhaust temperature, judging that the refrigerant quantity is too small, wherein the second preset exhaust pressure is less than the first preset exhaust pressure, and the second preset exhaust temperature is greater than the first preset exhaust temperature.
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