CN112984621B - Control method for exhaust superheat degree of parallel multi-split air conditioner - Google Patents

Control method for exhaust superheat degree of parallel multi-split air conditioner Download PDF

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CN112984621B
CN112984621B CN202110353233.XA CN202110353233A CN112984621B CN 112984621 B CN112984621 B CN 112984621B CN 202110353233 A CN202110353233 A CN 202110353233A CN 112984621 B CN112984621 B CN 112984621B
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expansion valve
side expansion
split
exhaust
liquid
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CN112984621A (en
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杨彦图
刘青
杨焕弟
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Guangdong Jiwei Technology Co Ltd
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Guangdong Jiwei Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

Abstract

A control method for exhaust superheat degree of a parallel multi-split air conditioner comprises a step S1 to a step S4, in the step S1 to the step S4, exhaust temperature TpB of a second compressor is increased while exhaust temperature TpA of a first compressor is reduced, exhaust superheat degree Ts1 of a first multi-split air conditioner system and exhaust superheat degree Ts2 of the second multi-split air conditioner system are maintained in a range of 15-25, exhaust superheat degree Ts1 of the first multi-split air conditioner system and exhaust superheat degree Ts2 of the second multi-split air conditioner system are enabled to be average, and therefore operation reliability of the parallel multi-split air conditioner system is guaranteed.

Description

Control method for exhaust superheat degree of parallel multi-split air conditioner
Technical Field
The invention relates to the technical field of parallel multi-split air conditioners, in particular to a control method of exhaust superheat degree of a parallel multi-split air conditioner.
Background
Generally, when multiple multi-split air conditioners are operated in parallel, the size of a heat exchanger and the size of the suction volume of a compressor of each multi-split air conditioner are possibly different, the use environment and the system load can be changed constantly along with time, and the output capacity of the multiple multi-split air conditioners are different due to different installation standard degrees, so that the quantity of refrigerant flowing in each multi-split air conditioner is uneven, the exhaust superheat degree of part of the multi-split air conditioners is larger, the exhaust superheat degree of part of the multi-split air conditioners is lower, the exhaust temperature deviation of different multi-split air conditioners is large, and the reliable operation of the parallel multi-split air conditioners is influenced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for controlling the superheat degree of exhaust gas of a parallel multi-split air conditioner.
In order to achieve the aim, the scheme provided by the invention is a control method of the exhaust superheat degree of a parallel multi-split air conditioner, wherein the parallel multi-split air conditioner comprises a first outdoor heat exchanger, a second outdoor heat exchanger, an indoor unit, a first compressor and a second compressor; the outdoor heat exchanger, the first compressor, the first air-side expansion valve, the first liquid-side expansion valve and the indoor unit form a first multi-split system, and the second outdoor heat exchanger, the second compressor, the second air-side expansion valve, the second liquid-side expansion valve and the indoor unit form a second multi-split system; the first multi-split system detects the exhaust superheat Ts1 and the exhaust temperature TpA of the first multi-split system when in operation; the second multi-split system detects the exhaust superheat Ts2 and the exhaust temperature TpB of the second multi-split system when in operation; the control method comprises the following steps:
step S1: electrifying and starting the parallel multi-split air conditioner, and setting the opening degree of the first air side expansion valve and the opening degree of the second air side expansion valve as initial preset opening degrees; setting both the opening degree of the first liquid side expansion valve and the opening degree of the second liquid side expansion valve to be maximum opening degrees;
step S2: after the parallel multi-split air conditioner is electrified and started to a preset time, the first multi-split air conditioner system detects the exhaust temperature TpA of the first compressor and the exhaust superheat Ts1 of the first multi-split air conditioner system once in each interval time; the second multi-split system detects the exhaust temperature TpB of the second compressor and the exhaust superheat Ts2 of the second multi-split system once in each interval time;
step S3: in step S2, if it is detected that Ts1 is greater than or equal to a first difference, the first gas-side expansion valve is made to increase in opening degree according to an adjustment rule, and the first liquid-side expansion valve is made to maintain a maximum opening degree, and meanwhile, in step S2, if it is detected that Ts2 is smaller than a second difference, the second gas-side expansion valve and the second liquid-side expansion valve are made to decrease in opening degree according to an adjustment rule;
step S4: in step S2, if it is detected that Ts1 is smaller than a first difference, enabling the first air side expansion valve to perform free adjustment according to the operation requirement of the first multi-split air-conditioning system; if the Ts2 is detected to be larger than or equal to a second difference value, enabling the second gas-side expansion valve and the second liquid-side expansion valve to be freely adjusted according to the operation requirement of the second multi-split system;
the regulation rule is as follows:
in step S2, when TpA-TpB is detected to be equal to or greater than the first temperature, the first gas side expansion valve is made to increase the first opening degree, and the second gas side expansion valve and the second liquid side expansion valve are made to decrease the first opening degree; when the first temperature is detected to be greater than or equal to the second temperature TpA-TpB, the first gas-side expansion valve is enabled to increase the second opening degree, and the second gas-side expansion valve and the second liquid-side expansion valve are enabled to decrease the second opening degree; when the second temperature is detected to be greater than or equal to the third temperature TpA-TpB, the first gas-side expansion valve is enabled to increase the third opening degree, and the second gas-side expansion valve and the second liquid-side expansion valve are enabled to decrease the third opening degree; and when the TpA-TpB is detected to be less than the third temperature, keeping the opening degrees of the first gas-side expansion valve, the second gas-side expansion valve and the second liquid-side expansion valve unchanged.
Further, the first opening degree, the second opening degree and the third opening degree are linearly and sequentially reduced.
Further, the first gas-side expansion valve, the first liquid-side expansion valve, the second gas-side expansion valve, and the second liquid-side expansion valve are all electronic expansion valves.
Further, the initial preset opening degree is 352P, and the maximum opening degree is 480P; the first difference is 15 and the second difference is 25. The first temperature is 10 ℃, the second temperature is 7 ℃, and the third temperature is 5 ℃.
Further, the exhaust port of the first compressor and the first outdoor heat exchanger are respectively provided with a temperature sensor for the first multi-split system to respectively detect the exhaust temperature TpA of the first compressor and the evaporation temperature of the first outdoor heat exchanger, so that the first multi-split system can detect and calculate the exhaust superheat Ts1 of the first multi-split system.
Further, the exhaust port of the second compressor and the second outdoor heat exchanger are respectively provided with a temperature sensor for the second multi-split system to respectively detect the exhaust temperature TpB of the second compressor and the evaporation temperature of the second outdoor heat exchanger, so that the second multi-split system can detect and calculate the exhaust superheat degree Ts2 of the second multi-split system.
Further, the exhaust port of the first compressor is connected to one end of a first outdoor heat exchanger, and the other end of the first outdoor heat exchanger is connected to one end of a first gas-side expansion valve; an air inlet of the first compressor is connected to one end of the first liquid-side expansion valve.
Further, the exhaust port of the second compressor is connected to one end of a second outdoor heat exchanger, and the other end of the second outdoor heat exchanger is connected to one end of the second gas-side expansion valve; and the air inlet of the second compressor is connected to one end of the second liquid-side expansion valve.
Further, the other end of the first air side expansion valve and the other end of the second air side expansion valve are connected in parallel to one end of the indoor unit.
Further, the other end of the first liquid side expansion valve and the other end of the second liquid side expansion valve are connected in parallel to the other end of the indoor unit.
The invention has the beneficial effects that: the exhaust temperature TpB of the second compressor is increased while the exhaust temperature TpA of the first compressor is reduced, and the exhaust superheat Ts1 of the first multi-split system and the exhaust superheat Ts2 of the second multi-split system are maintained in the range of 15-25, so that the exhaust superheat Ts1 of the first multi-split system and the exhaust superheat Ts2 of the second multi-split system are relatively average, and the operation reliability of the parallel multi-split system is guaranteed.
Drawings
Fig. 1 is a schematic diagram of the steps of the control method.
Fig. 2 is a schematic diagram of a parallel multi-split air conditioner.
Fig. 3 is a schematic diagram of the regulation law.
The system comprises a first compressor, a first outdoor heat exchanger, a first gas-side expansion valve, a first liquid-side expansion valve, a second compressor, a second outdoor heat exchanger, a second gas-side expansion valve, a second liquid-side expansion valve and an indoor unit, wherein the first compressor is 11, the first outdoor heat exchanger is 12, the first gas-side expansion valve is 13, the first liquid-side expansion valve is 14, the second compressor is 21, the second outdoor heat exchanger is 22, the second gas-side expansion valve is 23, the second liquid-side expansion valve is 24, and the indoor unit is 3.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 2, in the present embodiment, a control method 2 for balancing discharge temperatures of a parallel multi-split air conditioner includes a first outdoor heat exchanger 12, a second outdoor heat exchanger 22, an indoor unit 3, a first compressor 11, a second compressor 21, a first air-side expansion valve 13, a first liquid-side expansion valve 14, a second air-side expansion valve 23, and a second liquid-side expansion valve 24. A discharge port of the first compressor 11 is connected to one end of a first outdoor heat exchanger 12, and the other end of the first outdoor heat exchanger 12 is connected to one end of a first gas-side expansion valve 13; an intake port of the first compressor 11 is connected to one end of a first liquid-side expansion valve 14. A discharge port of the second compressor 21 is connected to one end of the second outdoor heat exchanger 22, and the other end of the second outdoor heat exchanger 22 is connected to one end of the second gas-side expansion valve 23; an intake port of the second compressor 21 is connected to one end of the second liquid-side expansion valve 24. The other end of the first gas-side expansion valve 13 and the other end of the second gas-side expansion valve 23 are connected in parallel to one end of the indoor unit 3; the other end of the first liquid side expansion valve 14 and the other end of the second liquid side expansion valve 24 are connected in parallel to the other end of the indoor unit 3. The first outdoor heat exchanger 12, the first compressor 11, the first gas-side expansion valve 13, the first liquid-side expansion valve 14 and the indoor unit 3 form a first multi-split system; the second outdoor heat exchanger 22, the second compressor 21, the second gas-side expansion valve 23, the second liquid-side expansion valve 24, and the indoor unit 3 constitute a second multi-split system. In the present embodiment, the first gas-side expansion valve 13, the first liquid-side expansion valve 14, the second gas-side expansion valve 23, and the second liquid-side expansion valve 24 are all electronic expansion valves.
In this embodiment, the exhaust port of the first compressor 11 and the first outdoor heat exchanger 12 are respectively provided with a temperature sensor for the first multi-split system to respectively detect the exhaust temperature TpA of the first compressor 11 and the evaporation temperature of the first outdoor heat exchanger 12, so that the first multi-split system detects and calculates the exhaust superheat Ts1 of the first multi-split system. The exhaust port of the second compressor 21 and the second outdoor heat exchanger 22 are respectively provided with a temperature sensor for the second multi-split system to respectively detect the exhaust temperature TpB of the second compressor 21 and the evaporation temperature of the second outdoor heat exchanger 22, so that the second multi-split system detects and calculates the exhaust superheat Ts2 of the second multi-split system.
Referring to fig. 1, in the present example, the control method includes the steps of:
step S1: electrifying and starting the parallel multi-split air conditioner, and setting the opening degree of the first air side expansion valve 13 and the opening degree of the second air side expansion valve 23 as initial preset opening degrees; the opening degree of the first liquid side expansion valve 14 and the opening degree of the second liquid side expansion valve 24 are both set to the maximum opening degree; in this embodiment, the initial preset opening degree is 352P, and the maximum opening degree is 480P.
Step S2: after the parallel multi-split air conditioner is electrified and started to the preset time, the first multi-split air conditioner system detects the exhaust temperature TpA of the first compressor 11 and the exhaust superheat Ts1 of the first multi-split air conditioner system once in each interval time; the second multi-split system detects the discharge temperature TpB of the second compressor 21 and the discharge superheat Ts2 of the second multi-split system at a time every interval. In this embodiment, the preset time is 30 minutes, and the interval time is 2 minutes.
Step S3: in step S2, if it is detected that Ts1 is greater than or equal to the first difference, the opening degree of the first air-side expansion valve 13 is increased according to an adjustment rule, so that the refrigerant flow rate of the first multi-split air-conditioning system is increased, and the first liquid-side expansion valve 14 is kept at the maximum opening degree, so that the refrigerant flow rate flowing back to the first compressor 11 from the indoor unit 3 is ensured to be the maximum flow rate, thereby reducing the exhaust temperature TpA of the first compressor 11 and the exhaust superheat degree Ts1 of the first multi-split air-conditioning system; meanwhile, if it is detected in step S2 that Ts2 is smaller than the second difference, the opening degrees of the second gas-side expansion valve 23 and the second liquid-side expansion valve 24 are decreased according to an adjustment rule, so that the flow rate of the refrigerant flowing from the second compressor 21 to the indoor unit 3 and the flow rate of the refrigerant flowing back from the indoor unit 3 to the second compressor 21 are decreased, and the exhaust temperature TpB of the second compressor 21 and the exhaust superheat degree Ts2 of the second multi-split air-conditioning system are increased. In this embodiment, the first difference is 15 and the second difference is 25.
Step S4: in step S2, if it is detected that Ts1 is smaller than the first difference, the first air-side expansion valve 13 is made to perform free adjustment according to the operation requirement of the first multi-split air-conditioning system; and if the Ts2 is detected to be larger than or equal to the second difference value, enabling the second gas-side expansion valve 23 and the second liquid-side expansion valve 24 to be freely adjusted according to the operation requirement of the second multi-split system.
Referring to fig. 3, in the present embodiment, the regulation rule is: in step S2, when the TpA-TpB is detected to be equal to or greater than the first temperature, the first gas-side expansion valve 13 is increased by the first opening degree, and the second gas-side expansion valve 23 and the second liquid-side expansion valve 24 are decreased by the first opening degree; in this embodiment, the first temperature is 10 ℃, and the first opening degree is 24P. When the first temperature is detected to be greater than or equal to the second temperature TpA-TpB, the first gas-side expansion valve 13 is increased by a second opening degree, and the second gas-side expansion valve 23 and the second liquid-side expansion valve 24 are decreased by the second opening degree; in the present embodiment, the second temperature is 7 ℃, and the second opening degree is 16P. When the second temperature is detected to be greater than or equal to the third temperature TpA-TpB, the first gas-side expansion valve 13 is increased by a third opening degree, and the second gas-side expansion valve 23 and the second liquid-side expansion valve 24 are decreased by the third opening degree; in this embodiment, the third temperature is 5 ℃, and the third opening is 8P. When the TpA-TpB < the third temperature, i.e., TpA-TpB < 5 ℃, is detected, the opening degrees of the first gas-side expansion valve 13, the second gas-side expansion valve 23, and the second liquid-side expansion valve 24 are kept unchanged. Through the regulation law, the exhaust temperature TpA of the first compressor 11 is reduced, the exhaust temperature TpB of the second compressor 21 is increased, the exhaust superheat degree Ts1 of the first multi-split air-conditioning system and the exhaust superheat degree Ts2 of the second multi-split air-conditioning system are maintained in the range of 15-25, the exhaust superheat degree Ts1 of the first multi-split air-conditioning system and the exhaust superheat degree Ts2 of the second multi-split air-conditioning system are relatively average, and therefore the operation reliability of the parallel multi-split air-conditioning system is guaranteed.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.

Claims (9)

1. The utility model provides a control method of parallel multi-connected air conditioning exhaust superheat degree, parallel multi-connected air conditioning exhaust superheat degree including first outdoor heat exchanger (12), second outdoor heat exchanger (22), indoor set (3), first compressor (11) and second compressor (21), its characterized in that: the outdoor air conditioning system is characterized by further comprising a first air side expansion valve (13), a first liquid side expansion valve (14), a second air side expansion valve (23) and a second liquid side expansion valve (24), wherein the first outdoor heat exchanger (12), the first compressor (11), the first air side expansion valve (13), the first liquid side expansion valve (14) and the indoor unit (3) form a first multi-split system, and the second outdoor heat exchanger (22), the second compressor (21), the second liquid side expansion valve (23), the second liquid side expansion valve (24) and the indoor unit (3) form a second multi-split system; the first multi-split system detects the exhaust superheat Ts1 and the exhaust temperature TpA of the first multi-split system when in operation; the second multi-split system detects the exhaust superheat Ts2 and the exhaust temperature TpB of the second multi-split system when in operation; the control method comprises the following steps:
step S1: electrifying and starting the parallel multi-split air conditioner, and setting the opening degree of the first air side expansion valve (13) and the opening degree of the second air side expansion valve (23) as initial preset opening degrees; setting both the opening degree of the first liquid side expansion valve (14) and the opening degree of the second liquid side expansion valve (24) to a maximum opening degree;
step S2: after the parallel multi-split air conditioner is electrified and started to a preset time, the first multi-split air conditioner system detects the exhaust temperature TpA of the first compressor (11) and the exhaust superheat Ts1 of the first multi-split air conditioner system once in each interval time; the second multi-split system detects the exhaust temperature TpB of the second compressor (21) and the exhaust superheat Ts2 of the second multi-split system once in each interval time;
step S3: in step S2, if it is detected that Ts1 is greater than or equal to a first difference, the first gas-side expansion valve (13) is made to increase in opening degree according to an adjustment rule, and the first liquid-side expansion valve (14) is made to maintain a maximum opening degree, and meanwhile, in step S2, if it is detected that Ts2 is less than a second difference, the second gas-side expansion valve (23) and the second liquid-side expansion valve (24) are made to decrease in opening degree according to an adjustment rule;
step S4: in step S2, if it is detected that Ts1 is smaller than a first difference, enabling the first air-side expansion valve (13) to perform free adjustment according to the operation requirement of the first multi-split air-conditioning system; if the Ts2 is detected to be larger than or equal to a second difference value, enabling the second gas-side expansion valve (23) and the second liquid-side expansion valve (24) to be freely adjusted according to the operation requirement of the second multi-split system;
the regulation rule is as follows:
in step S2, when it is detected that TpA-TpB is equal to or greater than the first temperature, the first gas-side expansion valve (13) is caused to increase in first opening degree, and the second gas-side expansion valve (23) and the second liquid-side expansion valve (24) are caused to decrease in first opening degree; when the first temperature is detected to be greater than or equal to the second temperature TpA-TpB, the first gas-side expansion valve (13) is enabled to increase the second opening degree, and the second gas-side expansion valve (23) and the second liquid-side expansion valve (24) are enabled to decrease the second opening degree; when the second temperature is detected to be greater than or equal to the third temperature TpA-TpB, the first gas-side expansion valve (13) is enabled to increase the third opening degree, and the second gas-side expansion valve (23) and the second liquid-side expansion valve (24) are enabled to decrease the third opening degree; when the TpA-TpB is detected to be less than the third temperature, the opening degrees of the first gas-side expansion valve (13), the second gas-side expansion valve (23) and the second liquid-side expansion valve (24) are kept unchanged; the first opening degree, the second opening degree and the third opening degree are linearly and sequentially reduced.
2. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the first air side expansion valve (13), the first liquid side expansion valve (14), the second air side expansion valve (23) and the second liquid side expansion valve (24) are all electronic expansion valves.
3. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the initial preset opening degree is 352P, and the maximum opening degree is 480P; the first difference is 15 and the second difference is 25; the first temperature is 10 ℃, the second temperature is 7 ℃, and the third temperature is 5 ℃.
4. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the exhaust port of the first compressor (11) and the first outdoor heat exchanger (12) are respectively provided with a temperature sensor for the first multi-split system to respectively detect the exhaust temperature TpA of the first compressor (11) and the evaporation temperature of the first outdoor heat exchanger (12), so that the first multi-split system can detect and calculate the exhaust superheat Ts1 of the first multi-split system.
5. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: and the exhaust port of the second compressor (21) and the second outdoor heat exchanger (22) are respectively provided with a temperature sensor for the second multi-split system to respectively detect the exhaust temperature TpB of the second compressor (21) and the evaporation temperature of the second outdoor heat exchanger (22), so that the second multi-split system can detect and calculate the exhaust superheat Ts2 of the second multi-split system.
6. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the exhaust port of the first compressor (11) is connected to one end of a first outdoor heat exchanger (12), and the other end of the first outdoor heat exchanger (12) is connected to one end of a first air-side expansion valve (13); an inlet port of the first compressor (11) is connected to one end of the first liquid-side expansion valve (14).
7. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the discharge port of the second compressor (21) is connected to one end of a second outdoor heat exchanger (22), and the other end of the second outdoor heat exchanger (22) is connected to one end of the second gas-side expansion valve (23); an air inlet of the second compressor (21) is connected to one end of the second liquid-side expansion valve (24).
8. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the other end of the first air side expansion valve (13) and the other end of the second air side expansion valve (23) are connected in parallel to one end of the indoor unit (3).
9. The control method for the superheat degree of exhaust gas of the parallel multi-split air conditioner as claimed in claim 1, wherein: the other end of the first liquid side expansion valve (14) and the other end of the second liquid side expansion valve (24) are connected in parallel to the other end of the indoor unit (3).
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