CN111486532A - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
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- CN111486532A CN111486532A CN202010315407.9A CN202010315407A CN111486532A CN 111486532 A CN111486532 A CN 111486532A CN 202010315407 A CN202010315407 A CN 202010315407A CN 111486532 A CN111486532 A CN 111486532A
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- heat exchanger
- indoor heat
- refrigerant
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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
- 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
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- 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]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The application discloses air conditioning system relates to air conditioning technology field for solve current air conditioning system heat effect poor, user experience poor to and current air source heat pump water system's heat exchange efficiency, the poor problem of reliability. The air conditioning system provided by the application comprises a refrigerant loop and a refrigerant branch; the refrigerant loop comprises a four-way valve, wherein the first end of the four-way valve, the outdoor heat exchanger, the first throttling element, the first indoor heat exchanger and the third end of the four-way valve are sequentially connected end to end, the second end of the four-way valve is communicated with an exhaust port of the compressor, and the fourth end of the four-way valve is communicated with a suction port of the compressor; the refrigerant branch comprises a second indoor heat exchanger and a second throttling element which are connected in series, one end, far away from the second throttling element, of the second indoor heat exchanger is connected between the air suction port and the fourth end, and one end, far away from the second indoor heat exchanger, of the second throttling element is connected between the first throttling element and the outdoor heat exchanger. The air conditioning system is used for cooling or heating.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to an air conditioning system.
Background
An air conditioning system generally comprises a refrigerant circulation loop formed by connecting four basic components including a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling device through pipelines, wherein a refrigerant continuously circulates and flows in the refrigerant circulation loop, changes state and exchanges heat with the outside, and therefore refrigeration or heating is achieved.
An air conditioning system in the prior art includes a compressor 01, a four-way valve 02, an outdoor heat exchanger 03, a throttling device 04, and an indoor heat exchanger 05, wherein a first end of the four-way valve 02, the outdoor heat exchanger 03, the throttling device 04, the indoor heat exchanger 05, and a third end of the four-way valve 02 are sequentially connected end to end, a second end of the four-way valve 02 is communicated with an exhaust port of the compressor 01, a fourth end of the four-way valve 02 is connected with an air suction port of the compressor 01, and the four-way valve 02 is used for controlling a refrigerant discharged from the exhaust port of the compressor 01 to flow into the outdoor heat exchanger.
When the air conditioning system operates in a heating mode, high-temperature and high-pressure refrigerant gas discharged from an exhaust port of the compressor 01 enters the indoor heat exchanger 05 through the four-way valve 02 to be condensed, the refrigerant gas is radiated to the surrounding air, the heated air is blown out from an air outlet of the air conditioner to realize heating of the indoor air, the condensed refrigerant flows into the throttling device 04 to be throttled and decompressed, then flows into the outdoor heat exchanger 02 to be evaporated, and the evaporated refrigerant returns to an air suction port of the compressor 01 again. However, heating is realized by a heating mode of blowing hot air, because cold air sinks and hot air rises, the temperature of air of indoor air close to the ground is low, feet of a user still feel cold, the requirement of human body heating comfort of 'head cold and foot hot' is not met, and the heating effect is poor. Moreover, realize heating, can make indoor dry through hot-blast heating system, lead to the user to use and experience poor.
Meanwhile, the prior art also provides an air source heat pump water system which comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, a gas cooler, a floor heating unit and a fan coil, wherein the gas cooler comprises a refrigerant flow channel and a water path flow channel which exchange heat with each other, an exhaust port of the compressor is communicated with a second end of the four-way valve, an air suction port of the compressor is connected with a fourth end of the four-way valve, a first end of the four-way valve, the outdoor heat exchanger, the throttling device, the refrigerant flow channel of the gas cooler and a third end of the four-way valve are sequentially connected end to end, the four-way valve is used for controlling the refrigerant discharged from the exhaust port of the compressor to flow into the refrigerant flow channel of the outdoor heat exchanger or the gas.
However, when the air source heat pump water system operates in the heating mode, the refrigerant exchanges heat with water in the water path flow channel in the refrigerant flow channel of the gas cooler, and then the hot water after heat exchange flows into the ground heating and releases heat to the ambient air, i.e., the water in the air source heat pump water system successively exchanges heat twice, and the heat exchange efficiency is low, and meanwhile, because the water exists in the air source heat pump water system, the water can generate scale under the long-time use condition, so that the water system is easy to block, and the water can be frozen under the condition of low temperature, so that the air source heat pump water system cannot normally operate, thereby causing poor reliability of the air source heat pump water system.
Disclosure of Invention
The air conditioning system provided by the embodiment of the application is used for solving the problems that the existing air conditioning system is poor in heating effect and user experience, and the existing air source heat pump water system is low in heat exchange efficiency and poor in reliability.
The air conditioning system provided by the embodiment of the application comprises a refrigerant circuit and a refrigerant branch circuit; the refrigerant loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling element and a first indoor heat exchanger, wherein the first end of the four-way valve, the outdoor heat exchanger, the first throttling element, the first indoor heat exchanger and the third end of the four-way valve are sequentially connected end to end, the second end of the four-way valve is communicated with an exhaust port of the compressor, and the fourth end of the four-way valve is communicated with an air suction port of the compressor; the refrigerant branch comprises a second indoor heat exchanger and a second throttling element which are connected in series, one end, far away from the second throttling element, of the second indoor heat exchanger is connected between a suction port of the compressor and the fourth end of the four-way valve, and one end, far away from the second indoor heat exchanger, of the second throttling element is connected between the first throttling element and the outdoor heat exchanger.
The air conditioning system that this application embodiment provided is when operation cooling mode, the cross valve outage, and the first end and the second end intercommunication of cross valve, the third end and the fourth end intercommunication of cross valve, first throttling element close to with the refrigerant circuit disconnection, the second throttling element is opened, in order to communicate the refrigerant branch road. The high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor flows into the outdoor heat exchanger through the four-way valve to be condensed, the condensed refrigerant flows into the second indoor heat exchanger through the second throttling element, is evaporated in the second indoor heat exchanger to absorb heat in ambient air so as to realize refrigeration, and the evaporated refrigerant returns to the air suction port of the compressor through the four-way valve again. The air conditioning system that this application embodiment provided is when operation mode of heating, the cross valve is electrified, the first end and the fourth end intercommunication of cross valve, the second end and the third end intercommunication of cross valve, first throttling element opens, in order to communicate the refrigerant circuit, second throttling element closes, thereby with the disconnection of refrigerant branch road, the high-temperature high-pressure refrigerant of the gas vent exhaust of compressor flows into first indoor heat exchanger through the cross valve and condenses, dispel the heat to the air on every side, in order to realize heating, the refrigerant after the condensation flows into second indoor heat exchanger through first throttling element, the refrigerant after the evaporation heat absorption gets back to the induction port of compressor again through the cross valve in the second indoor heat exchanger.
Compared with the prior art, the air conditioning system provided by the embodiment of the application comprises the first indoor heat exchanger and the second indoor heat exchanger, the first indoor heat exchanger acts in a heating mode, and the second indoor heat exchanger acts in a cooling mode, so that the heating end and the heating end are separated, wherein the first indoor heat exchanger can be matched with a common air conditioning end (namely, an air system for heat exchange) to realize the cooling of indoor air, and the cooling effect is good; the second indoor heat exchanger can be the fin or lay the capillary in the below ground to realize the radiation heating, reach the heating effect that warms up, and then satisfied the human heating travelling comfort requirement of "head cold foot is hot", improve user's use and experience. Meanwhile, when the air conditioning system operates in a heating mode, a high-temperature and high-pressure refrigerant discharged by the compressor directly enters the second indoor heat exchanger through the four-way valve to exchange heat with ambient air, so that secondary heat exchange does not exist, the heating efficiency is high, moreover, the air conditioning system does not have a water system, the problems that water can generate scale and is easy to freeze when the temperature is low can be avoided, and the reliability of the air conditioning system is improved.
In some embodiments of the present application, further comprising an oil separator, the oil separator comprising a refrigerant inlet, a refrigerant outlet, and an oil return, the refrigerant inlet being in communication with the discharge port of the compressor, the refrigerant outlet being in communication with the fourth end of the four-way valve; the oil return port is connected to a pipeline between the second indoor heat exchanger and the air suction port of the compressor and is positioned on the refrigerant loop to separate lubricating oil in high-temperature and high-pressure refrigerant discharged by the compressor so as to ensure that the compressor can safely and efficiently operate.
In some embodiments of the present application, the refrigerant cycle further includes an oil return branch, one end of the oil return branch is connected to the oil return port, and the other end of the oil return branch is connected to a pipe between the second indoor heat exchanger and the suction port of the compressor and located on the refrigerant loop; and the capillary tube is connected in series on the oil return branch path to adjust the oil return amount of the oil separator.
In some embodiments of the present application, the oil return device further comprises a first filter element disposed in the pipe of the oil return branch and located between the oil return port and the capillary tube.
In some embodiments of the present application, the refrigerant separator further comprises a pressure switch, and the pressure switch is disposed on a pipeline between the exhaust port of the compressor and the refrigerant inlet in the oil separator, so as to prevent the exhaust pressure of the compressor from being too high, which may result in abnormal pressure of the air conditioning system.
In some embodiments of the present application, the air conditioner further comprises a pressure sensor, wherein the pressure sensor is disposed on a connecting pipeline between the third end of the four-way valve and the first indoor heat exchanger, so as to detect a suction pressure of the air conditioning system when the air conditioning system operates in a cooling mode, and detect a discharge pressure of the air conditioning system when the air conditioning system operates in a heating mode.
In some embodiments of the application, the first indoor heat exchanger and the second indoor heat exchanger are both multiple, multiple parallel connection is performed between the first indoor heat exchangers, multiple parallel connection is performed between the second indoor heat exchangers, so that the effect of 'one drags more' is achieved, only one outdoor unit (namely one outdoor heat exchanger) needs to be arranged, the outdoor unit can be placed on the roof, and the structure is compact, attractive and space-saving.
In some embodiments of the present application, the refrigerant flow control device further includes a plurality of third throttling elements, and at least one third throttling element is disposed on a parallel branch where each of the second indoor heat exchangers is located, so as to achieve a split flow of refrigerant flowing through the plurality of second indoor heat exchangers.
In some embodiments of the present application, further comprising a second filter element disposed between the first indoor heat exchanger and the outdoor heat exchanger and within the tubes of the refrigerant circuit.
In some embodiments of the present application, further comprising a third filter element disposed within the duct between the first indoor heat exchanger and the first throttling element; a fourth filter element disposed in a duct between the second indoor heat exchanger and the second throttling element.
Drawings
FIG. 1 is a schematic diagram of a prior art air conditioning system;
FIG. 2 is a schematic structural diagram of an air conditioning system according to the present application;
FIG. 3 is a schematic diagram illustrating a flow direction of a refrigerant in a cooling mode of the air conditioning system of the present application;
FIG. 4 is a schematic diagram illustrating a flow direction of a refrigerant in a heating mode of the air conditioning system according to the present application;
FIG. 5 is a second schematic diagram of an air conditioning system according to the present application;
fig. 6 is a schematic structural diagram of an air conditioning system including a plurality of first indoor heat exchangers and a plurality of second indoor heat exchangers according to the present application.
Reference numerals:
01-a compressor; 02-a four-way valve; 03-outdoor heat exchanger; 04-a throttling device; 05-indoor heat exchanger; 1-a refrigerant circuit; 10-a compressor; 11-a four-way valve; 12-an outdoor heat exchanger; 13-a first throttling element; 14-a first indoor heat exchanger; 15-an oil separator; 16-a pressure switch; 17-a pressure sensor; 18-a second filter element; 19-a third filter element; 101-gas-liquid separator; 102-a first shut-off valve; 103-a second stop valve; 2-refrigerant branch; 20-a second indoor heat exchanger; 21-a second restriction element; 22-a fourth filter element; 23-a third stop valve; 24-a fourth stop valve; 25-a third throttling element; 3-an oil return branch; 31-an oil return capillary; 32-first filter element.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioning system performs a refrigeration cycle of the air conditioning system by using a compressor, a condenser, a throttling element, and an evaporator in the present application. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The throttling element expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the throttling element and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioning system may regulate the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and a throttling element may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The air conditioner is used as a heater in a heating mode when the indoor heat exchanger is used as a condenser, and as a cooler in a cooling mode when the indoor heat exchanger is used as an evaporator.
Referring to fig. 2 to 4, an air conditioning system provided in an embodiment of the present application includes a refrigerant circuit 1 and a refrigerant branch circuit 2; the refrigerant loop 1 comprises a compressor 10, a four-way valve 11, an outdoor heat exchanger 12, a first throttling element 13 and a first indoor heat exchanger 14, wherein the first end of the four-way valve 11, the outdoor heat exchanger 12, the first throttling element 13, the first indoor heat exchanger 14 and the third end of the four-way valve 11 are sequentially connected end to end, the second end of the four-way valve 11 is communicated with an exhaust port of the compressor 10, and the fourth end of the four-way valve 11 is communicated with an air suction port of the compressor 10; the refrigerant branch 2 includes a second indoor heat exchanger 20 and a second throttling element 21 connected in series with each other, an end of the second indoor heat exchanger 20 remote from the second throttling element 21 is connected between a suction port of the compressor 10 and a fourth end of the four-way valve 11, and an end of the second throttling element 21 remote from the second indoor heat exchanger 20 is connected between the first throttling element 13 and the outdoor heat exchanger 12.
When the air conditioning system provided by the embodiment of the application runs in a refrigeration mode, the four-way valve 11 is powered off, the first end and the second end of the four-way valve 11 are communicated, the third end and the fourth end of the four-way valve 11 are communicated, the first throttling element 13 is closed, so that the refrigerant loop 1 is disconnected, and the second throttling element 21 is opened, so that the refrigerant branch 2 is communicated. The high-temperature and high-pressure refrigerant discharged from the discharge port of the compressor 10 flows into the outdoor heat exchanger 12 through the four-way valve 11 to be condensed, the condensed refrigerant flows into the second indoor heat exchanger 20 through the second throttling element 21, and is evaporated in the second indoor heat exchanger 20 to absorb heat in ambient air to realize refrigeration, and the evaporated refrigerant returns to the suction port of the compressor 10 through the four-way valve 11 again, as shown in fig. 3, where the direction indicated by the arrow in fig. 3 is the flow direction of the refrigerant in the air conditioning system. When the air conditioning system provided in the embodiment of the present application operates in the heating mode, the four-way valve 11 is powered on, the first end and the fourth end of the four-way valve 11 are communicated, the second end and the third end of the four-way valve 11 are communicated, the first throttling element 13 is opened to communicate the refrigerant circuit 1, the second throttling element 21 is closed to disconnect the refrigerant branch 2, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 10 flows into the first indoor heat exchanger 14 through the four-way valve 11 to be condensed, heat is dissipated into the surrounding air to achieve heating, the condensed refrigerant flows into the second indoor heat exchanger 20 through the first throttling element 13, the refrigerant after evaporating and absorbing heat in the second indoor heat exchanger 20 returns to the suction port of the compressor 10 through the four-way valve 11 again, as shown in fig. 4, and the direction indicated by the arrow in fig. 4 is the flow direction of the.
Compared with the prior art, the air conditioning system provided by the embodiment of the application comprises the first indoor heat exchanger 14 and the second indoor heat exchanger 20, the first indoor heat exchanger 14 acts in a heating mode, and the second indoor heat exchanger 20 acts in a cooling mode, so that heating and heating ends are separated, wherein the first indoor heat exchanger 14 can be matched with a common air conditioning end (namely, a wind system for heat exchange) to realize the cooling of indoor air, and the cooling effect is good; the second indoor heat exchanger 20 can be the fin or lay the capillary in the below ground to realize the radiation heating, reach the heating effect that warms up, and then satisfied the human heating travelling comfort requirement of "head cold foot is hot", improve the user and use experience. Meanwhile, when the air conditioning system operates in a heating mode, a high-temperature and high-pressure refrigerant discharged by the compressor 10 directly enters the second indoor heat exchanger 20 through the four-way valve 11 to exchange heat with ambient air, so that secondary heat exchange does not exist, the heating efficiency is high, moreover, the air conditioning system does not have a water system, the problems that water can generate scale and the water is easy to freeze when the temperature is low can be avoided, and the reliability of the air conditioning system is further improved.
When the air conditioner is used specifically, the installation position of the first indoor heat exchanger 14 can be arranged below the second indoor heat exchanger 20, wherein the second indoor heat exchanger 20 is the tail end of the common air conditioner, the first indoor heat exchanger 10 can be selected to be a floor heating or radiating fin, and the floor heating is a copper capillary tube laid below the ground. Wherein, a refrigerant inlet end of the first indoor heat exchanger 14 is provided with a distributor to divide the refrigerant discharged from the discharge port of the compressor 10 and introduce the divided refrigerant into a plurality of copper capillaries arranged at intervals, respectively.
It should be noted that: if the refrigerant capacity of the first indoor heat exchanger 14 and the refrigerant capacity of the second indoor heat exchanger 20 are both equal to the refrigerant capacity of the outdoor heat exchanger 12, when the air conditioning system operates in the cooling mode, the user may also open the first throttling element 13 and close the second throttling element 21 according to his/her own needs, so that the refrigerant evaporates in the first indoor heat exchanger 14, and absorbs heat in the ambient air, thereby achieving the cooling effect.
Or, if the sum of the refrigerant capacity of the first indoor heat exchanger 14 and the refrigerant capacity of the second indoor heat exchanger 20 is equal to the refrigerant capacity of the outdoor heat exchanger 12, the air conditioning system can simultaneously open both the first throttling element 13 and the second throttling element 21 during the cooling mode, so that the refrigerant enters the first indoor heat exchanger 14 and the second indoor heat exchanger 20 respectively to evaporate, thereby cooling the indoor air.
During the operation of the compressor 10, part of the lubricant in the compressor 10 flows into the air conditioning system along with the refrigerant, which results in a decrease in the amount of lubricant in the compressor 10, and further causes problems such as friction and wear of the compressor 10, and loud operating noise of the compressor 10. Therefore, the air conditioning system provided by the embodiment of the application further comprises: the oil separator 15, the oil separator 15 includes refrigerant inlet, refrigerant outlet and oil return port, the refrigerant inlet communicates with air vent of the compressor 10, the refrigerant outlet communicates with fourth end of the four-way valve 11; the oil return port is connected to a pipe between the second indoor heat exchanger 20 and the suction port of the compressor 10, and is located in the refrigerant circuit 1, as shown in fig. 6. In the embodiment of the present application, the oil separator 15 is additionally provided to separate the lubricating oil in the high-temperature and high-pressure refrigerant discharged from the compressor 10 and return the separated lubricating oil to the compressor 10 again, so as to ensure that the compressor 10 operates safely and efficiently, as shown in fig. 5.
Referring to fig. 5, the air conditioning system further includes an oil return branch 3, one end of the oil return branch 3 is connected to an oil return port of the oil separator 15, and the other end of the oil return branch 3 is connected to a pipe between the second indoor heat exchanger 20 and the air suction port of the compressor 10 and is located on the refrigerant circuit 1; the oil return capillary 31 is arranged on the oil return branch 3 in series, so as to adjust the oil return amount of the oil separator 15, and avoid the system short circuit caused by the overlarge oil return amount entering the compressor 10 through the oil return port of the oil separator 15.
Because the inner diameter of the oil return capillary 31 is too small, the oil return capillary 31 is prevented from being blocked by impurities carried in the lubricating oil flowing out from the oil return port of the oil separator 15, and the air conditioning system further comprises a first filter element 32, wherein the first filter element 32 is arranged in the pipeline of the oil return branch 3 and is positioned between the oil return port of the oil separator 15 and the oil return capillary 31.
In some embodiments of the present application, the air conditioning system further includes a pressure switch 16, the pressure switch 16 is disposed on a pipeline between the exhaust port of the compressor 10 and the refrigerant inlet of the oil separator 15, and when the pressure of the refrigerant discharged from the exhaust port of the compressor 10 is too high, the pressure switch 16 is turned off, so that the compressor 10 stops operating, the exhaust pressure of the compressor 10 is prevented from being too high, and the air conditioning system can be safely operated.
Meanwhile, the pressure switch 16 is disposed on the pipe before the refrigerant inlet of the oil separator 15, and compared to the pipe after the refrigerant outlet of the oil separator 15, the discharge pressure of the compressor 10 detected by the pressure switch 16 in the former scheme is more accurate than that in the latter scheme because of the pressure loss of the refrigerant during the flow in the refrigerant pipe.
In some embodiments of the present application, the air conditioning system further includes a pressure sensor 17, the pressure sensor 17 is disposed on a connection pipeline between the third end of the four-way valve 11 and the first indoor heat exchanger 14, the suction pressure of the air conditioning system can be detected by disposing one pressure sensor 17 when the air conditioning system operates in the cooling mode, the discharge pressure of the air conditioning system is detected when the air conditioning system operates in the heating mode, and the normal operation of the air conditioning system is ensured.
Of course, the air conditioning system may also include a plurality of pressure sensors, the plurality of pressure sensors are disposed at intervals on a connection pipeline between the third end of the four-way valve 11 and the first indoor heat exchanger 14, and at this time, the suction pressure and the discharge pressure of the air conditioning system are average values of pressure values detected by the plurality of pressure sensors, so that the pressure values detected by the pressure sensors are more accurate.
Referring to fig. 6, there are a plurality of first indoor heat exchangers 14 and a plurality of second indoor heat exchangers 20, the plurality of first indoor heat exchangers 14 are connected in parallel, and the plurality of second indoor heat exchangers 20 are connected in parallel, and since the above arrangement only needs to set one outdoor unit (i.e. only needs to set one outdoor heat exchanger 12), one indoor unit (the first indoor heat exchanger 14 or the second indoor heat exchanger 20) can be independently started to operate, and a plurality of indoor units can also be simultaneously started, so that the control of the air conditioning system is more flexible and energy-saving.
In some embodiments of the present application, the air conditioning system further includes a plurality of third throttling elements 25, and at least one third throttling element 25 is disposed on the parallel branch where each second indoor heat exchanger 20 is located, so as to realize the diversion of the refrigerant flowing through the plurality of second indoor heat exchangers 20, so that the refrigerant flow in each second indoor heat exchanger 20 is more matched with the heat exchange amount of the second indoor heat exchanger 20 on the parallel branch where the second indoor heat exchanger 20 is located, and the heat exchange effect of the second indoor heat exchanger 20 is improved.
In some embodiments of the present application, the air conditioning system further includes a plurality of fourth throttling elements, and at least one fourth throttling element is disposed on the parallel branch where each first indoor heat exchanger 14 is located, so as to realize the diversion of the refrigerant flowing through the plurality of first indoor heat exchangers 14, so that the refrigerant flow in each first indoor heat exchanger 14 is more matched with the heat exchange amount of the first indoor heat exchanger 14 on the parallel branch where the refrigerant flow is located, and the heat exchange effect of the first indoor heat exchanger 14 is improved.
The first throttling element 13, the second throttling element 21, the third throttling elements 25 and the fourth throttling elements may be throttling capillary tubes or electronic expansion valves, and since the throttling effect of the throttling capillary tubes is related to the inner diameter and the length of the throttling capillary tubes and the flow of the refrigerant cannot be adjusted in real time, the first throttling element 13, the second throttling element 21, the third throttling elements 25 and the fourth throttling elements in the embodiment of the present application are all electronic expansion valves.
Referring to fig. 5 and 6, the air conditioning system further includes a second filter element 18, and the second filter element 18 is disposed between the first indoor heat exchanger 14 and the outdoor heat exchanger 12 and in a pipe of the refrigerant circuit 1, so as to prevent impurities of the refrigerant and lubricating oil mixed in the refrigerant from causing blockage of the first throttling element 13 and/or the second throttling element 21 when the refrigerant enters the first indoor heat exchanger 14 and/or the second indoor heat exchanger 20 after being condensed by the outdoor heat exchanger 12 in the cooling mode of the air conditioning system.
With continued reference to fig. 5, the air conditioning system further includes a third filter element 19, the third filter element 19 being disposed in the duct between the first indoor heat exchanger 14 and the first throttling element 13; and a fourth filter element 22, wherein the fourth filter element 22 is arranged in the pipeline between the second indoor heat exchanger 20 and the second throttling element 21, the third filter element 19 is arranged to prevent impurities in the refrigerant from blocking the first throttling element 13 when the air conditioning system is in a heating mode, and the fourth filter element 22 is arranged to further filter the impurities in the refrigerant flowing through the compressor 10, so as to reduce the impurities in the whole refrigerant circuit 1 and the refrigerant branch circuit 2 and prevent pipelines in the air conditioning system from being blocked.
Wherein, above-mentioned filter element is filter screen or filter bag, or other filter equipment, as long as can play the filter effect can, and this application embodiment does not do any restriction to the concrete structure of filter element.
In some embodiments of the present application, the air conditioning system further includes a gas-liquid separator 101, the gas-liquid separator 101 is disposed between the suction port of the compressor 10 and the second indoor heat exchanger 20 and is located on the refrigerant loop 1, the gas-liquid separator 101 not only can perform a gas-liquid separation function on the refrigerant in a gas-liquid two-phase state discharged by the second indoor heat exchanger 20 to prevent the compressor 10 from sucking gas and carrying liquid, but also can buffer the pressure of the refrigerant compared with the fact that the refrigerant discharged by the second indoor heat exchanger 20 directly returns to the suction port of the compressor 10, thereby ensuring that the suction pressure of the compressor 10 is stable and the operation is safe and reliable.
For the scheme that the air conditioning system comprises the gas-liquid separator 101, the oil separator 15 and the oil return branch 3, one end of the oil return branch 3, which is far away from an oil return opening, is connected to a pipeline between the gas-liquid separator 101 and an air suction opening of the compressor 10, so that the situation that lubricating oil separated by the oil separator 15 flows into the gas-liquid separator 101 and cannot return to the interior of the compressor 10 as soon as possible to cause abrasion of the compressor 10 is avoided.
In some embodiments of the present application, the air conditioning system further includes a first cut-off valve 102, a second cut-off valve 103, a third cut-off valve 23, and a fourth cut-off valve 24, the first cut-off valve 102 is disposed between the first indoor heat exchanger 14 and the third end of the four-way valve 11, the second cut-off valve 103 is disposed between the first indoor heat exchanger 14 and the first throttling element 13, the third cut-off valve 23 is disposed on the refrigerant branch 2 and at an end of the second indoor heat exchanger 20 remote from the second throttling element 21, and the fourth cut-off valve 24 is disposed between the second indoor heat exchanger 20 and the second throttling element 21, and the components of the air conditioning system located in the indoor unit and the components of the air conditioning system located in the outdoor unit can be connected through the four cut-off valves, thereby facilitating transportation of the indoor unit and the outdoor unit.
It should be noted that: in the air conditioning system including the first cut-off valve 102, the second cut-off valve 103, the third cut-off valve 23, the fourth cut-off valve 24, and the pressure sensor 17, the pressure sensor 17 is provided in the pipe between the first cut-off valve 102 and the third end of the four-way valve 11.
Further, with the arrangement including both the second and fourth cut-off valves 103 and 24 and the third and fourth filter elements 19 and 22 in the air conditioning system, the second cut-off valve 103 is installed between the first indoor heat exchanger 14 and the third filter element 19 so that the third filter element 19 is located within the indoor unit, facilitating replacement and maintenance thereof. Likewise, a fourth cut-off valve 24 is provided between the second indoor heat exchanger 20 and the fourth filter element 22.
In some embodiments of the present application, a diameter of a pipe between the first indoor heat exchanger 14 and the first cutoff valve 102 in the air conditioning system is larger than a diameter of a pipe between the first indoor heat exchanger 14 and the second cutoff valve 103. Similarly, in the air conditioning system, the diameter of the pipe between the second indoor heat exchanger 20 and the third stop valve 23 is larger than the diameter of the pipe between the second indoor heat exchanger 20 and the fourth stop valve 24, that is, the diameter of the refrigerant gas pipe is larger than the diameter of the refrigerant liquid pipe.
Accordingly, the diameter of the first shutoff valve 102 is equal to the diameter of the pipe between the first indoor heat exchanger 14 and the first shutoff valve 102, the diameter of the second shutoff valve 103 is equal to the diameter of the pipe between the second indoor heat exchanger 20 and the second shutoff valve 103, and the diameter of the first shutoff valve 102 is larger than the diameter of the second shutoff valve 103. The third stop valve 23 has a diameter equal to the diameter of the pipe between the second indoor heat exchanger 20 and the third stop valve 23, and the fourth stop valve 24 has a diameter equal to the diameter of the pipe between the first indoor heat exchanger 14 and the fourth stop valve 24, that is, the third stop valve 23 has a diameter greater than the diameter of the fourth stop valve 24.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An air conditioning system includes a refrigerant circuit and a refrigerant branch;
the refrigerant loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling element and a first indoor heat exchanger, wherein the first end of the four-way valve, the outdoor heat exchanger, the first throttling element, the first indoor heat exchanger and the third end of the four-way valve are sequentially connected end to end, the second end of the four-way valve is communicated with an exhaust port of the compressor, and the fourth end of the four-way valve is communicated with an air suction port of the compressor;
the refrigerant branch comprises a second indoor heat exchanger and a second throttling element which are connected in series, one end, far away from the second throttling element, of the second indoor heat exchanger is connected between a suction port of the compressor and the fourth end of the four-way valve, and one end, far away from the second indoor heat exchanger, of the second throttling element is connected between the first throttling element and the outdoor heat exchanger.
2. The air conditioning system of claim 1, further comprising:
the oil separator comprises a refrigerant inlet, a refrigerant outlet and an oil return port, the refrigerant inlet is communicated with an exhaust port of the compressor, and the refrigerant outlet is communicated with the fourth end of the four-way valve; the oil return port is connected to a pipeline between the second indoor heat exchanger and the air suction port of the compressor and is positioned on the refrigerant loop.
3. The air conditioning system of claim 2, further comprising:
one end of the oil return branch is connected with the oil return port, and the other end of the oil return branch is connected to a pipeline between the second indoor heat exchanger and the air suction port of the compressor and is positioned on the refrigerant loop;
and the oil return capillary tube is arranged on the oil return branch in series.
4. The air conditioning system of claim 3, further comprising:
the first filter element is arranged in a pipeline of the oil return branch and is positioned between the oil return port and the capillary tube.
5. The air conditioning system according to any one of claims 2 to 4, further comprising:
a pressure switch disposed on a conduit between a discharge port of the compressor and the refrigerant inlet in the oil separator.
6. The air conditioning system of claim 1, further comprising:
and the pressure sensor is arranged on a connecting pipeline between the third end of the four-way valve and the first indoor heat exchanger.
7. The air conditioning system of claim 1, further comprising: the first indoor heat exchangers and the second indoor heat exchangers are multiple, the first indoor heat exchangers are connected in parallel, and the second indoor heat exchangers are connected in parallel.
8. The air conditioning system of claim 7, further comprising:
and at least one third throttling element is arranged on a parallel branch where each second indoor heat exchanger is positioned.
9. The air conditioning system of claim 1, further comprising:
a second filter element disposed between the first indoor heat exchanger and the outdoor heat exchanger and within a conduit of the refrigerant circuit.
10. The air conditioning system according to claim 1 or 9, further comprising:
a third filter element disposed in a duct between the first indoor heat exchanger and the first throttling element;
a fourth filter element disposed in a duct between the second indoor heat exchanger and the second throttling element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010315407.9A CN111486532A (en) | 2020-04-21 | 2020-04-21 | Air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010315407.9A CN111486532A (en) | 2020-04-21 | 2020-04-21 | Air conditioning system |
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| CN111486532A true CN111486532A (en) | 2020-08-04 |
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| CN202010315407.9A Pending CN111486532A (en) | 2020-04-21 | 2020-04-21 | Air conditioning system |
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| CN112361525A (en) * | 2020-11-02 | 2021-02-12 | 海信（山东）空调有限公司 | Air conditioner dehumidification method and air conditioner |
| CN114294713A (en) * | 2020-09-21 | 2022-04-08 | 海信（山东）空调有限公司 | Multi-connected air conditioning system |
| CN114294712A (en) * | 2020-09-21 | 2022-04-08 | 海信（山东）空调有限公司 | Multi-connected air conditioning system |
| CN116358182A (en) * | 2023-02-28 | 2023-06-30 | 珠海格力电器股份有限公司 | Cold and warm combined supply system and control method |
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| CN2554527Y (en) * | 2002-03-15 | 2003-06-04 | 张沈杰 | Variable frequence domestic central air conditioner |
| CN110220257A (en) * | 2018-03-01 | 2019-09-10 | 维谛技术有限公司 | The progress control method and device of air-conditioning system, air-conditioning system |
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Application publication date: 20200804 |