CN106839493B - Air conditioning system and defrosting control method thereof - Google Patents

Air conditioning system and defrosting control method thereof Download PDF

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Publication number
CN106839493B
CN106839493B CN201611047333.5A CN201611047333A CN106839493B CN 106839493 B CN106839493 B CN 106839493B CN 201611047333 A CN201611047333 A CN 201611047333A CN 106839493 B CN106839493 B CN 106839493B
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China
Prior art keywords
outdoor heat
heat exchanger
way valve
defrosting
branch
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CN201611047333.5A
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CN106839493A (en
Inventor
张阳
徐如好
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
    • B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3202—Cooling devices using evaporation, i.e. not including a compressor, e.g. involving fuel or water evaporation
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0251—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units being defrosted alternately
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • 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
    • F25B2347/021—Alternate defrosting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The invention provides an air conditioning system and a defrosting control method thereof, wherein the air conditioning system comprises a compressor (1), a four-way valve (2), a throttling device (4), an indoor heat exchanger unit (6) and an outdoor heat exchanger unit (3), the outdoor heat exchanger unit (3) comprises more than two outdoor heat exchangers, the inlet end and the outlet end of each outdoor heat exchanger are respectively provided with a control valve component, the control valve components can be used for controlling the indoor heat exchanger unit to heat and simultaneously the outdoor heat exchangers needing to be defrosted can be heated and defrosted, and the rest outdoor heat exchangers can be used for evaporating and refrigerating. According to the invention, when the outdoor heat exchanger needs defrosting, the control valve assembly is controlled to enable the high-temperature and high-pressure refrigerant at the exhaust end of the compressor to flow through the outdoor heat exchanger needing defrosting in addition to indoor heating, so that the indoor heating effect can be continuously maintained during defrosting, the indoor (preferably in-car) temperature cannot be reduced, and the comfort of the indoor environment cannot be influenced.

Description

Air conditioning system and defrosting control method thereof
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning system and a defrosting control method thereof.
Background
At present, the traditional passenger car adopts gasoline, natural gas, diesel oil and the like as fuels to drive an engine to provide driving force. The power of the traditional passenger car air conditioner is also derived from the driving force output by the engine, and the opening type (or semi-closed type) air conditioner compressor is driven to work through the action of the clutch, so that the refrigeration effect in summer is realized. In addition, the traditional passenger car adopts cooling water of an automobile engine as a heat source in winter, and hot air is provided for heating the carriage, so that heat supply of an air conditioning system in winter is realized.
Because no waste heat generated by an engine in the electric motor coach can be utilized, the heating of the air conditioning system of the electric motor coach is a difficult problem, the problem is solved by a heat pump technology and a PTC electric heating device in the industry at present, the energy efficiency of the heat pump system is far higher than that of PTC electric heating, and the heat pump is more economical to use. When the ambient temperature is high, a heat pump is mainly used; and under the lower condition of ambient temperature, the evaporating temperature of the heat pump system is lower, the surface of the heat exchanger is easy to frost, when the frost layer is thickened, the heat exchange of the heat exchanger is deteriorated, and the air flow resistance is increased, so that the unit heating quantity is reduced, and the unit stops running when serious, so that the heat pump needs to defrost frequently, and the defrosting can cause temperature fluctuation in the vehicle, the riding comfort is reduced, and PTC electric heating is mainly used when the ambient temperature is lower.
Therefore, the technology of improving defrosting and delaying frosting on the evaporation side is one of effective ways of improving the heating performance and the system stability of the heat pump type bus air conditioning system in a low-temperature environment. The defrosting mode commonly used at present mainly comprises reverse circulation defrosting. The reverse circulation defrosting is to reverse the flow of refrigerant along the loop through the reversing of the four-way valve, convert the heat pump from heating working condition to refrigerating working condition, absorb heat from the vehicle and discharge the heat pump to the outdoor heat exchanger to melt the frost on the surface of the heat pump. Reverse circulation defrosting is simple and easy to implement, defrosting effect is good, but high-low pressure butt joint process can generate serious impact on all parts of the system during defrosting, and system reliability is affected. If the defrosting control system is not perfect, even false defrosting can be caused. And when the environmental condition is lower, defrosting period is relatively longer, and the temperature in the vehicle can be obviously reduced, so that the comfort of the environment in the vehicle is seriously influenced.
Because the high-low pressure butt joint process in the defrosting of the air conditioning system in the prior art can generate serious impact on each part of the system, the reliability of the system is affected; the imperfect defrosting control system can cause false defrosting; and when the environmental working condition is lower, the defrosting period is relatively longer, the temperature in the vehicle is obviously reduced, and the technical problems of comfort of the environment in the vehicle and the like are seriously influenced, so the invention designs an air conditioning system and a defrosting control method thereof.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the temperature in the vehicle is obviously reduced in the defrosting period of the air conditioning system in the prior art, so as to provide the air conditioning system and the defrosting control method thereof.
The invention provides an air conditioning system which comprises a compressor, a four-way valve, a throttling device, an indoor heat exchanger unit and an outdoor heat exchanger unit, wherein the outdoor heat exchanger unit comprises more than two outdoor heat exchangers, the inlet end and the outlet end of each outdoor heat exchanger are respectively provided with a control valve component, the outdoor heat exchangers which can be used for controlling the indoor heat exchanger unit to heat and simultaneously are required to be defrosted can be used for heating and defrosting, and the remaining outdoor heat exchangers can be used for evaporating and refrigerating.
Preferably, the D end of the four-way valve is connected to the outlet of the compressor, and the S end of the four-way valve is connected to the inlet of the compressor, and has:
the outlet ends of more than two outdoor heat exchangers are connected to the C end of the four-way valve after being converged through respective main outlet pipelines, and the inlet ends of more than two outdoor heat exchangers are connected to one end of the throttling device after being converged through respective main inlet pipelines;
Or, the outlet ends of the two or more outdoor heat exchangers are connected to one end of the throttling device after being converged through respective main outlet pipelines, and the inlet ends of the two or more outdoor heat exchangers are connected to the C end of the four-way valve after being converged through respective main inlet pipelines.
Preferably, the device further comprises a liquid storage tank connected to the other end of the throttling device,
an outlet branch is branched from the main outlet pipe at the outlet end of each outdoor heat exchanger, and an inlet branch is branched from the main inlet pipe at the inlet end of each outdoor heat exchanger, and comprises:
more than two outlet branches are connected into the liquid storage tank after being converged, and more than two inlet branches are connected to the E end of the four-way valve after being converged; or more than two outlet branches are connected to the E end of the four-way valve after being converged, and more than two inlet branches are connected to the liquid storage tank after being converged.
Preferably, a control valve assembly at the outlet end of each of said outdoor heat exchangers is used to control the outlet end to open the main outlet line, or to open the outlet branch;
and/or a control valve assembly at the inlet end of each of said outdoor heat exchangers for controlling the inlet end to open into the main inlet line, or to open into the inlet branch.
Preferably, the outdoor heat exchanger unit comprises two outdoor heat exchangers, namely a first outdoor heat exchanger and a second outdoor heat exchanger:
the first end of the first outdoor heat exchanger is connected to the C end of the four-way valve after being converged with a third main path connected with the third end of the second outdoor heat exchanger through a first main path;
and/or the second end of the first outdoor heat exchanger is connected to the one end of the throttling device after being converged with a fourth main path connected with the fourth end of the second outdoor heat exchanger through a second main path.
Preferably, a first branch is connected to the first end of the first outdoor heat exchanger and branched from the first main path, a third branch is connected to the third end of the second outdoor heat exchanger and branched from the third main path, and the first branch and the third branch are connected to the liquid storage tank after being converged;
and/or the second end of the first outdoor heat exchanger is branched with the second main path and is connected with a second branch path, the third end of the second outdoor heat exchanger is branched with the fourth main path (14) and is connected with a fourth branch path, and the second branch path and the fourth branch path are converged and then are connected to the E end of the four-way valve.
Preferably, the control valve assembly includes:
the first three-way valve is arranged at the first end of the first outdoor heat exchanger, the A1 end of the first three-way valve is connected with the first end, the B1 end of the first three-way valve is connected with the first main path, and the C1 end of the first three-way valve is connected with the first branch path;
and/or a second three-way valve arranged at the second end of the first outdoor heat exchanger, wherein the A2 end of the second three-way valve is connected with the second end, the B2 end of the second three-way valve is connected with the second main path, and the C2 end of the second three-way valve is connected with the second branch path;
and/or a third three-way valve arranged at the third end of the second outdoor heat exchanger, wherein the A3 end of the third three-way valve is connected with the third end, the B3 end of the third three-way valve is connected with the third main path, and the C3 end of the third three-way valve is connected with the third branch path;
and/or a fourth three-way valve arranged at the fourth end of the second outdoor heat exchanger, wherein the A4 end of the fourth three-way valve is connected with the fourth end, the B4 end of the fourth three-way valve is connected with the fourth main path, and the C4 end of the fourth three-way valve is connected with the fourth branch path.
Preferably, the control valve assembly includes:
a first on-off valve arranged on the first main path and a second on-off valve arranged on the first branch path;
and/or a third cut-off valve arranged on the second main path and a fourth cut-off valve arranged on the second branch path;
And/or a fifth on-off valve arranged on the third main path and a sixth on-off valve arranged on the third branch path;
and/or a seventh on-off valve arranged on the fourth main path and an eighth on-off valve arranged on the fourth branch path.
Preferably, the indoor heat exchanger unit comprises two indoor heat exchangers, namely a first indoor heat exchanger and a second indoor heat exchanger;
and/or one end of the first indoor heat exchanger and one end of the second indoor heat exchanger are joined and then connected to the E end of the four-way valve, and the other ends of the first indoor heat exchanger and the second indoor heat exchanger are joined and then connected to the liquid storage tank.
Preferably, the air conditioning system is an electric bus air conditioning system.
The present invention also provides a defrosting control method of the aforementioned air conditioning system, wherein when at least one outdoor heat exchanger in the outdoor heat exchanger unit needs defrosting, the control valve assemblies at the inlet end and the outlet end of the outdoor heat exchanger needing defrosting are controlled to act, so that at least one outdoor heat exchanger can be heated for defrosting.
Preferably, when the outdoor heat exchanger unit includes two outdoor heat exchangers, and the control valve assembly includes first, second, third, and fourth three-way valves:
If the first outdoor heat exchanger needs defrosting, controlling the A1 end of the first three-way valve to be communicated with the C1 end, controlling the A2 end of the second three-way valve to be communicated with the C2 end, controlling the A3 end of the third three-way valve to be communicated with the B3 end and controlling the A4 end of the fourth three-way valve to be communicated with the B4 end;
if the second outdoor heat exchanger needs defrosting, the A3 end of the third three-way valve is controlled to be communicated with the C3 end, the A4 end of the fourth three-way valve is controlled to be communicated with the C4 end, the A1 end of the first three-way valve is controlled to be communicated with the B1 end, and the A2 end of the second three-way valve is controlled to be communicated with the B2 end.
Preferably, when the outdoor heat exchanger unit includes two outdoor heat exchangers, and the control valve assembly includes first, second, third, fourth, fifth, sixth, seventh, and eighth on-off valves:
if the first outdoor heat exchanger needs defrosting, the first and third on-off valves are controlled to be closed, the second and fourth on-off valves are controlled to be opened, the fifth and seventh on-off valves are controlled to be opened, and the sixth and eighth on-off valves are controlled to be closed;
and if the second outdoor heat exchanger needs defrosting, controlling the first and third on-off valves to be opened, controlling the second and fourth on-off valves to be closed, and controlling the fifth and seventh on-off valves to be closed and controlling the sixth and eighth on-off valves to be opened.
The air conditioning system and the defrosting control method thereof have the following beneficial effects:
1. According to the air conditioning system and the defrosting control method thereof, when one or more outdoor heat exchangers need defrosting, the control valve assembly can be controlled to enable high-temperature and high-pressure refrigerant at the exhaust end of the compressor to flow through the outdoor heat exchangers needing defrosting in addition to the indoor heat exchanger set for heating, and other outdoor heat exchangers not needing defrosting are used for evaporating and absorbing heat for refrigeration so as to absorb heat from the outdoor, so that the indoor heating effect can be kept continuously during defrosting, the indoor (preferably in-vehicle) temperature is not reduced, and the comfort of the indoor (preferably in-vehicle) environment is not affected;
2. the air conditioning system and the defrosting control method thereof effectively eliminate the situation that the high-low pressure butt joint process generates serious impact on each part of the system during defrosting, and ensure the running reliability of the system; the perfection degree of the defrosting control system is improved, and the occurrence of false defrosting is prevented; and when the environmental condition is low, the defrosting period is not relatively longer.
Drawings
Fig. 1 is a schematic structural view of an air conditioning system of the present invention.
The reference numerals in the drawings are as follows:
1-compressor, 2-four-way valve, 3-outdoor heat exchanger unit, 301-first outdoor heat exchanger, 3011-first end, 3012-second end, 302-second outdoor heat exchanger, 3021-third end, 3022-fourth end, 4-throttle device, 5-liquid storage tank, 6-indoor heat exchanger unit, 601-first indoor heat exchanger, 602-second indoor heat exchanger, 7-gas-liquid separator, 801-first three-way valve, 802-second three-way valve, 803-third three-way valve, 804-fourth three-way valve, 9-outdoor fan, 10-indoor fan, 11-first main path, 12-second main path, 13-third main path, 14-fourth main path, 15-first branch, 16-second branch, 17-third branch, 18-fourth branch.
Detailed Description
Example 1
As shown in fig. 1, the invention provides an air conditioning system, which comprises a compressor 1, a four-way valve 2, a throttling device 4, an indoor heat exchanger unit 6 and an outdoor heat exchanger unit 3, wherein the outdoor heat exchanger unit 3 comprises more than two outdoor heat exchangers (which can be mutually connected in parallel), the inlet end and the outlet end of each outdoor heat exchanger are respectively provided with a control valve component, the outdoor heat exchangers which can be used for controlling the indoor heat exchanger unit to heat and simultaneously need to be frosted can be heated and frosted, and the residual outdoor heat exchangers are used for evaporation refrigeration (the residual outdoor heat exchangers are more than or equal to 1).
Through more than two outdoor heat exchangers, the inlet end and the outlet end of each outdoor heat exchanger are provided with a control valve assembly, when one or more than one outdoor heat exchanger needs defrosting, the control valve assembly can be controlled to enable high-temperature and high-pressure refrigerant at the exhaust end of the compressor to flow through the outdoor heat exchanger needing defrosting besides the indoor heat exchanger unit for heating, and the rest outdoor heat exchangers not needing defrosting are used for evaporating and absorbing heat for refrigeration so as to absorb heat from the outdoor, so that the indoor heating effect can be kept continuously during defrosting, the indoor (preferably in-vehicle) temperature can not be reduced, and the comfort of the indoor (preferably in-vehicle) environment can not be affected;
The invention effectively eliminates the situation that the high-low pressure butt joint process generates more serious impact on each component of the system during defrosting (the existing defrosting technology stops the compressor and enters the defrosting process after the high pressure and the low pressure are balanced; the perfection degree of the defrosting control system is improved, and the occurrence of the situation of false defrosting is prevented (the temperature of a pipe can be detected by additionally arranging a temperature sensor at the outdoor heat exchanger to judge which outdoor heat exchanger or condenser needs to defrost, so that the false defrosting is prevented); and when the environment working condition is lower, the defrosting period is not longer (the four-way valve is generally adopted for reversing defrosting in the conventional machine type, when the environment temperature is lower, the defrosting period is as long as tens of minutes, the temperature in the vehicle is obviously reduced, and PTC electric heating is generally required to be started at the moment.
When the heat pump type electric bus air conditioner is used for heating, the four-way valve is used for reversing defrosting, and the temperature in the bus fluctuates, so that the comfort is affected. According to the invention, by providing a novel defrosting structure, when the air conditioning unit enters a defrosting mode, the four-way valve is not reversed, the in-vehicle fan still blows hot air, so that the fluctuation of the temperature in the vehicle is reduced, and the heating performance is improved.
The invention can provide a stable heat source when the bus air conditioning system heats and operates, obviously reduces the influence of defrosting on the temperature in the vehicle, improves the heating performance of the system and the working reliability of the air conditioning system, avoids the impact of frequent start and stop of the air conditioner on a battery, has small fluctuation of the temperature in the vehicle, and can effectively improve the low-temperature heating performance of the system.
Preferably, the D end of the four-way valve 2 (the four-way valve 2 includes four ends, namely, C end, D end, E end and S end) is connected to the outlet of the compressor 1, and the S end of the four-way valve 2 is connected to the inlet of the compressor 1, and has:
the outlet ends of more than two outdoor heat exchangers are connected to the C end of the four-way valve after being converged through respective main outlet pipelines, and the inlet ends of more than two outdoor heat exchangers are connected to one end of the throttling device 4 after being converged through respective main inlet pipelines;
Or, the outlet ends of the two or more outdoor heat exchangers are connected to one end of the throttling device 4 after being converged through respective main outlet pipelines, and the inlet ends of the two or more outdoor heat exchangers are connected to the C end of the four-way valve after being converged through respective main inlet pipelines.
The air conditioning system has the advantages that the outlet ends of more than two outdoor heat exchangers are connected to the throttling device or the four-way valve through the main outlet pipeline, and the inlet ends of more than two outdoor heat exchangers are connected to the throttling device or the four-way valve through the main inlet pipeline, so that the outdoor heat exchangers can be connected to other parts of the air conditioning circulating system such as a compressor, the throttling device and the like, the outdoor heat exchangers can perform condensation heat release in a refrigerating mode and evaporation heat absorption in a heating mode, and refrigeration or heating circulation of the air conditioning system is completed.
Preferably, a liquid storage tank 5 connected to the other end of the throttling device 4,
an outlet branch (i.e. an outlet end connected to a main outlet line or outlet branch) is branched from the main outlet line at the outlet end of each of the outdoor heat exchangers, and an inlet branch (i.e. an inlet end connected to a main inlet line or inlet branch) is branched from the main inlet line at the inlet end of each of the outdoor heat exchangers, and has:
More than two outlet branches are joined and then connected into the liquid storage tank 5, more than two inlet branches are connected to the E end of the four-way valve 2 after being converged; alternatively, more than two outlet branches are joined and then connected to the E end of the four-way valve 2, and more than two inlet branches are joined and then connected to the liquid storage tank 5.
The invention is characterized in that the outlet ends of more than two outdoor heat exchangers of the air conditioning system are provided with outlet branches and are connected to a liquid storage tank or a four-way valve through the outlet branches, and the inlet ends of more than two outdoor heat exchangers are provided with inlet branches and are connected to the liquid storage tank or the four-way valve through the inlet branches, so that each outdoor heat exchanger can be connected to a high-pressure exhaust end of a compressor through the inlet branches when defrosting is needed, so that high-temperature and high-pressure refrigerant is utilized to condense and release heat in the outdoor heat exchanger needing defrosting, and flows back to the liquid storage tank through the outlet branches to enter circulation, thereby achieving the purpose of defrosting.
Preferably, a control valve assembly at the outlet end of each of said outdoor heat exchangers is used to control the outlet end to open the main outlet line, or to open the outlet branch;
a control valve assembly at the inlet end of each of said outdoor heat exchangers is used to control the inlet end to open the main inlet line, or to open the inlet branch.
Through the control valve component that is used for controlling the exit end switch-on main export pipeline or export branch road of setting up in outdoor heat exchanger exit and the control valve component that is used for controlling the entrance end switch-on main import pipeline or import branch road of setting up in entrance point department, can make the purpose that realizes normal refrigeration mode or heating mode when outdoor heat exchanger export intercommunication main export pipeline, entrance point connect main import pipeline, can realize the purpose and the effect of heating defrosting to this outdoor heat exchanger when outdoor heat exchanger exit end intercommunication export branch road and entrance point intercommunication import branch road, accomplished the effect that carries out accurate regulation and control according to actual defrosting needs.
Example 2
As shown in fig. 1, this example is a preferred implementation based on example 1,
the outdoor heat exchanger unit comprises two outdoor heat exchangers which are connected in parallel, namely a first outdoor heat exchanger 301 and a second outdoor heat exchanger 302 (the heat exchange areas of the two outdoor heat exchangers are preferably equal):
The first end 3011 of the first outdoor heat exchanger 301 is connected to the C-end of the four-way valve 2 after being converged by the first main path 11 and the third main path 13 connected to the third end 3021 of the second outdoor heat exchanger 302;
the second end 3012 of the first outdoor heat exchanger 301 is connected to the one end of the throttling device 4 (preferably an electronic expansion valve) by a second main circuit 12 merging with a fourth main circuit 14 connected to the fourth end 3022 of the second outdoor heat exchanger 302.
The outdoor heat exchanger unit of the air conditioning system comprises two outdoor heat exchangers, wherein one ends (a first end and a third end respectively) of the two outdoor heat exchangers are connected to a throttle device or a four-way valve through a first main path and a third main path respectively after being converged, and one ends (a second end and a fourth end respectively) of the two outdoor heat exchangers are connected to the throttle device or the four-way valve through a second main path and a fourth main path respectively after being converged, so that the two outdoor heat exchangers can be connected to other parts of the air conditioning circulation system such as a compressor, the throttle device and the like, each outdoor heat exchanger can conduct condensation heat release under a refrigerating mode, evaporation heat absorption under a heating mode, and refrigeration or heating circulation of the air conditioning system is completed.
Preferably, the method comprises the steps of,
a first branch line 15 is connected to the first end 3011 of the first outdoor heat exchanger 301 and the first main line 11 in a branching manner, a third branch line 17 is connected to the third end 3021 of the second outdoor heat exchanger 302 and the third main line 13 in a branching manner, and the first branch line 15 and the third branch line 17 are connected to the liquid storage tank 5 (see fig. 1, in which three pipes are inserted, three pipes are connected) after being joined;
the second end 3012 of the first outdoor heat exchanger 301 is branched from the second main path 12 and connected to a second branch 16, the third end 3021 of the second outdoor heat exchanger 302 is branched from the fourth main path 14 and connected to a fourth branch 18, and the second branch 16 merges with the fourth branch 18 and is connected to the E end of the four-way valve 2.
The air conditioning system comprises a preferred structural form of two outdoor heat exchangers, a specific connection mode that one end (a first end and a third end respectively) of each of the two outdoor heat exchangers is provided with an outlet branch (comprising a first branch and a third branch) and is connected to a liquid storage tank or a four-way valve after being converged by the first branch and the third branch respectively, and a specific connection mode that one end (a second end and a fourth end respectively) of each of the two outdoor heat exchangers is provided with an inlet branch (comprising a second branch and a fourth branch) and is connected to the liquid storage tank or the four-way valve after being converged by the second branch and the fourth branch respectively, so that the purposes that when defrosting and defrosting are needed, each outdoor heat exchanger can be connected to a high-pressure exhaust end of a compressor by utilizing high-temperature high-pressure refrigerant in the outdoor heat exchanger to be defrosted, and can be returned to the liquid storage tank by the first branch or the third branch to enter circulation are achieved, and when the first outdoor heat exchanger is defrosted, the second outdoor heat exchanger is not normally connected to a main heat absorption part of the main heat exchanger through the second branch and the four-way valve; when the second outdoor heat exchanger is used for defrosting, the first outdoor heat exchanger does not perform defrosting and normal evaporation and heat absorption, and is still connected to the compressor, the four-way valve and other components through the first main path and the second main path.
Preferably, the control valve assembly includes:
the first three-way valve 801 disposed at the first end 3011 of the first outdoor heat exchanger 301, where an A1 end (the first three-way valve includes three ends, namely, an A1 end, a B1 end, and a C1 end) of the first three-way valve 801 is connected to the first end, the B1 end is connected to the first main path 11, and the C1 end is connected to the first branch path 15;
a second three-way valve 802 disposed at the second end 3012 of the first outdoor heat exchanger 301, wherein an A2 end (the second three-way valve includes three ends, namely, an A2 end, a B2 end and a C2 end) of the second three-way valve 802 is connected to the second end, the B2 end is connected to the second main path 12, and the C2 end is connected to the second branch path 16;
a third three-way valve 803 disposed at the third end 3021 of the second outdoor heat exchanger 302, wherein an A3 end (the third three-way valve includes three ends, namely, an A3 end, a B3 end and a C3 end) of the third three-way valve 803 is connected to the third end, the B3 end is connected to the third main path 13, and the C3 end is connected to the third branch path 17;
the fourth three-way valve 804 disposed at the fourth end 3022 of the second outdoor heat exchanger 302, where an A4 end (the fourth three-way valve includes three ends, namely an A4 end, a B4 end, and a C4 end) of the fourth three-way valve 804 is connected to the fourth end, the B4 end is connected to the fourth main path 14, and the C4 end is connected to the fourth branch path 18.
The first three-way valve arranged at the first end of the first outdoor heat exchanger and used for controlling the first end to be connected with the first main path or the first branch path and the second three-way valve arranged at the second end and used for controlling the second end to be connected with the second main path or the second branch path can judge whether the first outdoor heat exchanger frosts or not according to the needs, if so, the first three-way valve is controlled to control the end A1 to be connected with the end C1, the end A2 of the second three-way valve is controlled to be connected with the end C2, and if not, the end A1 is controlled to be connected with the end B1, and the end A2 is controlled to be connected with the end B2, so that the intelligent switching between defrosting and normal refrigerating and heating modes is finished;
the third three-way valve arranged at the third end of the second outdoor heat exchanger and used for controlling the third end to be connected with a third main path or a third branch path and the fourth three-way valve arranged at the fourth end and used for controlling the fourth end to be connected with a fourth main path or a fourth branch path can judge whether the second outdoor heat exchanger frosts or not according to the needs, if so, the third three-way valve is controlled to control the end A3 to be connected with the end C3, the end A4 of the fourth three-way valve is controlled to be connected with the end C4, and if not, the end A3 is controlled to be connected with the end B3, and the end A4 is controlled to be connected with the end B4, so that the intelligent switching between defrosting and normal refrigerating and heating modes is finished;
Therefore, the purposes and effects of heating and defrosting any one of the two outdoor heat exchangers and evaporating and absorbing heat of the other outdoor heat exchanger are achieved, and the effect of accurately adjusting and controlling according to actual defrosting needs is achieved.
1. Refrigeration mode
In the cooling mode, the first three-way valve 801, the second three-way valve 802, the third three-way valve 803, and the fourth three-way valve 804 are connected in the direction a and B, and the direction C is closed, so that the four-way valve 2 is not energized and is not commutated. The exhaust gas of the compressor sequentially passes through the four-way valve 2 and is split into two paths: one path flows through the first three-way valve 801, the first outdoor heat exchanger 301, the second three-way valve 802; the other path flows through the third three-way valve 803, the second outdoor heat exchanger 302, and the fourth three-way valve 804. Then the two paths are converged and then flow through the throttling device 4 and the liquid storage tank 5, and are divided into two paths again to flow through the first indoor heat exchanger 601 and the second indoor heat exchanger 602 respectively, and then flow through the four-way valve 2 and the gas-liquid separator 7 and return to the compressor 1. The first, second, third and fourth three-way valves are preferably all electromagnetic three-way valves, as follows.
2. Heating mode
When the heating mode is operated, the first three-way valve 801, the second three-way valve 802, the third three-way valve 803 and the fourth three-way valve 804 are communicated with each other in the A direction and the B direction, the C direction is closed, and the four-way valve 2 is electrified and commutated. The exhaust gas of the compressor sequentially passes through the four-way valve 2, one path of the exhaust gas after being split flows through the first indoor heat exchanger 601, one path of the exhaust gas after being split flows through the second indoor heat exchanger 602, and the exhaust gas after being combined flows through the liquid storage tank 5 and the throttling device 4 and is split into two paths: one path flows through the second three-way valve 802, the first outdoor heat exchanger 301, the first three-way valve 801; one path flows through the fourth three-way valve 804, the second outdoor heat exchanger 302, and the third three-way valve 803. Then the two paths are converged and then flow through the four-way valve 2 and the gas-liquid separator 7 to return to the compressor 1. During this operation, the accumulator 5 serves to store excess refrigerant when the system is over-filled with circulating refrigerant.
3. Defrosting mode
When the surface of the outdoor heat exchanger unit 3 frosts to a certain extent, the unit enters a defrosting mode.
1) The first three-way valve 801 and the second three-way valve 802 are connected in the direction a and the direction C, and the direction B is closed. The third three-way valve 803 and the fourth three-way valve 804 are communicated with each other in the direction A and B, the direction C is closed, and the four-way valve 2 is still in an energized reversing state. The exhaust gas of the compressor sequentially passes through the four-way valve 2 to be respectively divided into three paths: two paths respectively flow through the first indoor heat exchanger 601 and the second indoor heat exchanger 602 and then are converged into the liquid storage tank 5; the third flow passes through the second three-way valve 802, the first outdoor heat exchanger 301, the first three-way valve 801, and also returns to the reservoir tank 5. Then flows through the throttling device 4, the fourth three-way valve 804, the second outdoor heat exchanger 302, the third three-way valve 803, the four-way valve 2 and the gas-liquid separator 7, and returns to the compressor 1.
2) The first three-way valve 801 and the second three-way valve 802 are connected in the direction a and the direction B, and the direction C is closed. The third three-way valve 803 and the fourth three-way valve 804 are communicated with each other in the direction A and the direction C, the direction B is closed, and the four-way valve 2 is still in an energization reversing state. The exhaust gas of the compressor sequentially passes through the four-way valve 2 to be respectively divided into three paths: two paths respectively flow through the first indoor heat exchanger 601 and the second indoor heat exchanger 602 and then are converged into the liquid storage tank 5; the third flow passes through the fourth three-way valve 804, the second outdoor heat exchanger 302, the third three-way valve 803, and also returns to the reservoir tank 5. Then flows through the throttling device 4, the second three-way valve 802, the first outdoor heat exchanger 301, the first three-way valve 801, the four-way valve 2 and the gas-liquid separator 7, and returns to the compressor 1.
In the process, the flow direction of the refrigerant is changed by controlling the switch of the three-way valve, so that a part of exhaust gas can continuously flow into the evaporator to continuously supply heat for the interior of the vehicle; while introducing a portion of the exhaust gas into the partial condenser so that the partial condenser can defrost normally. After the partial defrosting is finished, continuing to finish defrosting of the next partial condenser through reversing of the electromagnetic three-way valve until the defrosting process of all condensers is finished, and exiting the mode. Therefore, the problem that the air conditioner stops heating when the system is defrosted and the temperature fluctuation in the vehicle is large is effectively solved.
Example 3
The present embodiment is a modified embodiment performed under the specific implementation manner of the three-way valve in embodiment 2, and mainly, the three-way valve is replaced by an on-off valve (not shown in the figure) disposed on two pipelines, so as to achieve the function of the original three-way valve, and the on-off valve is preferably an electromagnetic valve, so that the reliability of system control is higher.
Preferably, the control valve assembly includes:
a first on-off valve arranged on the first main path 11 and a second on-off valve arranged on the first branch path 15; the first end of the first outdoor heat exchanger is connected with the first main circuit or the first branch circuit;
A third on-off valve provided on the second main circuit 12 and a fourth on-off valve provided on the second branch circuit 16); the second end of the first outdoor heat exchanger is connected with the second main path or the second branch path;
a fifth on-off valve provided on the third main path 13 and a sixth on-off valve provided on the third branch path 17; the third end for controlling the second outdoor heat exchanger is connected with the third main path or the third branch path;
a seventh on-off valve provided on the fourth main path 14 and an eighth on-off valve provided on the fourth branch path 18. The fourth end for controlling the second outdoor heat exchanger is connected to the fourth main circuit or to the fourth branch circuit.
Example 4
As shown in fig. 1, preferably, the indoor heat exchanger unit includes two indoor heat exchangers connected in parallel, namely a first indoor heat exchanger 601 and a second indoor heat exchanger 602;
one end of the first indoor heat exchanger 601 and one end of the second indoor heat exchanger 602 are joined and then connected to the E end of the four-way valve, and the other ends of the two are joined and then connected to the liquid storage tank 5.
The indoor heat exchanger unit of the air conditioning system specifically comprises two indoor heat exchangers, a specific connection mode that one ends of the two outdoor heat exchangers are respectively converged and then connected to a liquid storage tank or a four-way valve, and a specific connection mode that the other ends of the two outdoor heat exchangers are respectively converged and then connected to the four-way valve or the liquid storage tank, so that the two outdoor heat exchangers can be connected to other parts of the air conditioning circulating system such as a compressor, the liquid storage tank and the like, each outdoor heat exchanger can absorb heat by evaporation in a refrigerating mode, absorb heat by condensation in a heating mode, and absorb heat by condensation in a defrosting mode, and refrigeration, heating and defrosting of the air conditioning system can be effectively completed.
Preferably, the air conditioning system is an electric bus air conditioning system. The air conditioning system is a specific preferable structural form and application place, namely, the air conditioning system can be applied to an electric bus to defrost when being used for heating the environment in the electric bus, so that the environment temperature in the electric bus is not reduced, and the comfort level of passengers in the electric bus is improved.
According to the structural characteristics of the electric bus air conditioner, the outdoor heat exchanger is generally divided into two parts, and an electric three-way valve device is added between the inlet and the outlet of each part of the outdoor heat exchanger, so that the outdoor heat exchanger of each part can defrost in turn, meanwhile, the heat pump device can be ensured to continuously work, the temperature in the bus is stable, the PTC electric heating is reduced, the driving mileage of the bus air conditioner is prolonged, and the system performance can be effectively improved.
The invention also provides a defrosting control method of the air conditioning system, when at least one outdoor heat exchanger in the outdoor heat exchanger unit needs defrosting, the control valve assemblies at the inlet end and the outlet end of the outdoor heat exchanger needing defrosting are controlled to act, so that at least one outdoor heat exchanger can be heated for defrosting.
Due to the adoption of the air conditioning system, when the outdoor heat exchanger needs defrosting, the control valve assembly at the inlet end or the outlet end of the outdoor heat exchanger can be controlled, so that the inlet of the outdoor heat exchanger can be connected to the high-pressure exhaust end of the compressor, and the high-pressure high-temperature refrigerant can enter the compressor, so that the outdoor heat exchanger needing defrosting realizes the effect and the process of heating and condensing, further achieves the effect and the purpose of removing the frosting on the surface of the outdoor heat exchanger, and the four-way valve is not changed at the moment, so that the condensation and heating effect of the original indoor heat exchanger is still unchanged, only a little needs to be ensured, and at least one outdoor heat exchanger provides the effect of evaporating and absorbing heat so as to absorb heat from the environment and provide the indoor heat exchanger needing defrosting. Therefore, the indoor environment temperature is not reduced in the defrosting period, and the indoor comfort level is effectively improved.
Preferably, when the outdoor heat exchanger unit comprises two outdoor heat exchangers and the control valve assembly comprises first, second, third and fourth three-way valves 801, 802, 803, 804:
if the first outdoor heat exchanger needs defrosting, controlling the A1 end of the first three-way valve 801 to be communicated with the C1 end and controlling the A2 end of the second three-way valve 802 to be communicated with the C2 end, so that the first end of the first outdoor heat exchanger is communicated with the first branch, the second end of the first outdoor heat exchanger is communicated with the second branch, and the first outdoor heat exchanger heats and defrostes; the end A3 of the third three-way valve 803 is controlled to be communicated with the end B3, the end A4 of the fourth three-way valve 804 is controlled to be communicated with the end B4, so that the third end of the second outdoor heat exchanger is communicated with a third main path, the fourth end of the second outdoor heat exchanger is communicated with a fourth main path, and the second outdoor heat exchanger is used for refrigerating, evaporating and absorbing heat;
if the second outdoor heat exchanger needs defrosting, controlling the A3 end and the C3 end of the third three-way valve 803 to be communicated and controlling the A4 end and the C4 end of the fourth three-way valve 804 to be communicated, so that the third end and the third branch of the second outdoor heat exchanger are communicated, the fourth end and the fourth branch of the second outdoor heat exchanger are communicated, and the second outdoor heat exchanger heats and defrostes; the end A1 of the first three-way valve 801 is controlled to be communicated with the end B1, the end A2 of the second three-way valve 802 is controlled to be communicated with the end B2, so that the first end of the first outdoor heat exchanger is communicated with a first main path, the second end of the first outdoor heat exchanger is communicated with a second main path, and the first outdoor heat exchanger is used for refrigerating, evaporating and absorbing heat;
The air conditioning system comprises two outdoor heat exchangers and comprises a specific control method and control steps when four three-way valves, so that the first outdoor heat exchanger can conduct condensation heat release when defrosting is needed, the second outdoor heat exchanger can conduct evaporation heat absorption, the second outdoor heat exchanger can conduct condensation heat release when defrosting is needed, the first outdoor heat exchanger can conduct evaporation heat absorption, and the purpose and effect of selectively and effectively controlling defrosting are achieved.
Preferably, when the outdoor heat exchanger unit includes two outdoor heat exchangers, and the control valve assembly includes first, second, third, fourth, fifth, sixth, seventh, and eighth on-off valves:
if the first outdoor heat exchanger needs defrosting, the first and third on-off valves are controlled to be closed, and the second and fourth on-off valves are controlled to be opened, so that the first end of the first outdoor heat exchanger is communicated with the first branch, the second end of the first outdoor heat exchanger is communicated with the second branch, and the first outdoor heat exchanger heats and defrostes; the fifth on-off valve and the seventh on-off valve are controlled to be opened, and the sixth on-off valve and the eighth on-off valve are controlled to be closed, so that the third end of the second outdoor heat exchanger is communicated with the third main path, the fourth end of the second outdoor heat exchanger is communicated with the fourth main path, and the second outdoor heat exchanger is used for refrigerating, evaporating and absorbing heat;
If the second outdoor heat exchanger needs defrosting, the first and third three-way shut-off valves are controlled to be opened, and the second and fourth three-way shut-off valves are controlled to be closed, so that the third end of the second outdoor heat exchanger is communicated with the third branch, the fourth end of the second outdoor heat exchanger is communicated with the fourth branch, and the second outdoor heat exchanger heats and defrostes; the fifth on-off valve and the seventh on-off valve are controlled to be closed, and the sixth on-off valve and the eighth on-off valve are controlled to be opened, so that the first end of the first outdoor heat exchanger is communicated with the first main path, the second end of the first outdoor heat exchanger is communicated with the second main path, and the first outdoor heat exchanger is used for refrigerating, evaporating and absorbing heat;
the air conditioning system comprises two outdoor heat exchangers, and comprises a specific control method and control steps when eight on-off valves, so that the first outdoor heat exchanger can conduct condensation heat release when defrosting is needed, the second outdoor heat exchanger can conduct evaporation heat absorption, the second outdoor heat exchanger can conduct condensation heat release when defrosting is needed, the first outdoor heat exchanger can conduct evaporation heat absorption, and the purpose and effect of selectively and effectively controlling defrosting are achieved.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (11)

1. An air conditioning system, characterized in that: the indoor heat exchanger comprises a compressor (1), a four-way valve (2), a throttling device (4), an indoor heat exchanger unit (6) and an outdoor heat exchanger unit (3), wherein the outdoor heat exchanger unit (3) comprises more than two outdoor heat exchangers, the inlet end and the outlet end of each outdoor heat exchanger are respectively provided with a control valve component, the outdoor heat exchangers which can be used for controlling the indoor heat exchanger unit to heat and are required to be frosted can be used for heating and defrosting, and the rest outdoor heat exchangers can be used for evaporating and refrigerating;
the end D of the four-way valve (2) is connected with the outlet of the compressor (1), the end S of the four-way valve (2) is connected with the inlet of the compressor (1), and the four-way valve comprises:
the outlet ends of more than two outdoor heat exchangers are connected to the C end of the four-way valve after being converged through respective main outlet pipelines, and the inlet ends of more than two outdoor heat exchangers are connected to one end of the throttling device (4) after being converged through respective main inlet pipelines;
or, the outlet ends of the two or more outdoor heat exchangers are connected to one end of the throttling device (4) after being converged through respective main outlet pipelines, and the inlet ends of the two or more outdoor heat exchangers are connected to the C end of the four-way valve after being converged through respective main inlet pipelines;
The device also comprises a liquid storage tank (5) connected to the other end of the throttling device (4);
an outlet branch is branched from the main outlet pipe at the outlet end of each outdoor heat exchanger, and an inlet branch is branched from the main inlet pipe at the inlet end of each outdoor heat exchanger, and comprises:
more than two outlet branches are connected into the liquid storage tank (5) after being converged, and more than two inlet branches are connected to the E end of the four-way valve (2) after being converged; or more than two outlet branches are connected to the E end of the four-way valve (2) after being combined, and more than two inlet branches are connected to the liquid storage tank (5) after being combined.
2. An air conditioning system according to claim 1, wherein: a control valve assembly at the outlet end of each of said outdoor heat exchangers for controlling the outlet end to open to the main outlet line, or to open to the outlet branch;
and/or a control valve assembly at the inlet end of each of said outdoor heat exchangers for controlling the inlet end to open into the main inlet line, or to open into the inlet branch.
3. An air conditioning system according to claim 1, wherein:
the outdoor heat exchanger unit comprises two outdoor heat exchangers, namely a first outdoor heat exchanger (301) and a second outdoor heat exchanger (302):
The first end (3011) of the first outdoor heat exchanger (301) is connected to the C end of the four-way valve (2) after being converged by the first main path (11) and the third main path (13) connected with the third end (3021) of the second outdoor heat exchanger (302);
and/or the second end (3012) of the first outdoor heat exchanger (301) is connected to the one end of the throttling device (4) after merging with a fourth main path (14) connected with the fourth end (3022) of the second outdoor heat exchanger (302) through a second main path (12).
4. An air conditioning system according to claim 3, characterized in that:
a first branch (15) is connected to the first end (3011) of the first outdoor heat exchanger (301) and the first main path (11) in a branching manner, a third branch (17) is connected to the third end (3021) of the second outdoor heat exchanger (302) and the third main path (13) in a branching manner, and the first branch (15) and the third branch (17) are connected to the liquid storage tank (5) after being converged;
and/or, the second end (3012) of the first outdoor heat exchanger (301) is branched from the second main path (12) and connected with a second branch path (16), the third end (3021) of the second outdoor heat exchanger (302) is branched from the fourth main path (14) and connected with a fourth branch path (18), and the second branch path (16) and the fourth branch path (18) are converged and then connected to the E end of the four-way valve (2).
5. An air conditioning system according to claim 4, wherein: the control valve assembly includes:
a first three-way valve (801) disposed at the first end (3011) of the first outdoor heat exchanger (301), wherein an A1 end of the first three-way valve (801) is connected to the first end, a B1 end is connected to the first main path (11), and a C1 end is connected to the first branch path (15);
and/or a second three-way valve (802) disposed at the second end (3012) of the first outdoor heat exchanger (301), wherein an A2 end of the second three-way valve (802) is connected to the second end, a B2 end is connected to the second main path (12), and a C2 end is connected to the second branch path (16);
and/or a third three-way valve (803) disposed at the third end (3021) of the second outdoor heat exchanger (302), wherein an A3 end of the third three-way valve (803) is connected to the third end, a B3 end is connected to the third main path (13), and a C3 end is connected to the third branch path (17);
and/or a fourth three-way valve (804) arranged at the fourth end (3022) of the second outdoor heat exchanger (302), wherein the end A4 of the fourth three-way valve (804) is connected with the fourth end, the end B4 is connected with the fourth main path (14), and the end C4 is connected with the fourth branch path (18).
6. An air conditioning system according to claim 4, wherein: the control valve assembly includes:
A first on-off valve arranged on the first main path (11) and a second on-off valve arranged on the first branch path (15);
and/or a third on-off valve arranged on the second main path (12) and a fourth on-off valve arranged on the second branch path (16);
and/or a fifth on-off valve arranged on the third main path (13) and a sixth on-off valve arranged on the third branch path (17);
and/or a seventh on-off valve arranged on the fourth main path (14) and an eighth on-off valve arranged on the fourth branch path (18).
7. An air conditioning system according to any of claims 1-6, characterized in that: the indoor heat exchanger unit comprises two indoor heat exchangers, namely a first indoor heat exchanger (601) and a second indoor heat exchanger (602);
and/or one end of the first indoor heat exchanger (601) and one end of the second indoor heat exchanger (602) are connected to the E end of the four-way valve after being converged, and the other ends of the two are connected to the liquid storage tank (5) after being converged.
8. An air conditioning system according to any of claims 1-6, characterized in that: the air conditioning system is an electric bus air conditioning system.
9. A defrosting control method of an air conditioning system according to any one of claims 1 to 8, characterized in that: when at least one outdoor heat exchanger in the outdoor heat exchanger unit needs defrosting, a control valve assembly at the inlet end and the outlet end of the outdoor heat exchanger needing defrosting is controlled to act, so that at least one outdoor heat exchanger can be heated for defrosting.
10. The defrosting control method of claim 9, wherein: when the outdoor heat exchanger unit comprises two outdoor heat exchangers and the control valve assembly comprises first, second, third and fourth three-way valves (801, 802, 803, 804):
if the first outdoor heat exchanger needs defrosting, controlling the A1 end of the first three-way valve (801) to be communicated with the C1 end, controlling the A2 end of the second three-way valve (802) to be communicated with the C2 end, controlling the A3 end of the third three-way valve (803) to be communicated with the B3 end and controlling the A4 end of the fourth three-way valve (804) to be communicated with the B4 end;
if the second outdoor heat exchanger needs defrosting, the A3 end of the third three-way valve (803) is controlled to be communicated with the C3 end, the A4 end of the fourth three-way valve (804) is controlled to be communicated with the C4 end, the A1 end of the first three-way valve (801) is controlled to be communicated with the B1 end, and the A2 end of the second three-way valve (802) is controlled to be communicated with the B2 end.
11. The defrosting control method of claim 9, wherein: when the outdoor heat exchanger unit includes two outdoor heat exchangers and the control valve assembly includes first, second, third, fourth, fifth, sixth, seventh, and eighth on-off valves:
if the first outdoor heat exchanger needs defrosting, the first and third on-off valves are controlled to be closed, the second and fourth on-off valves are controlled to be opened, the fifth and seventh on-off valves are controlled to be opened, and the sixth and eighth on-off valves are controlled to be closed;
And if the second outdoor heat exchanger needs defrosting, controlling the first and third on-off valves to be opened, controlling the second and fourth on-off valves to be closed, and controlling the fifth and seventh on-off valves to be closed and controlling the sixth and eighth on-off valves to be opened.
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