CN112444003A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
- Publication number
- CN112444003A CN112444003A CN202011373391.3A CN202011373391A CN112444003A CN 112444003 A CN112444003 A CN 112444003A CN 202011373391 A CN202011373391 A CN 202011373391A CN 112444003 A CN112444003 A CN 112444003A
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- CN
- China
- Prior art keywords
- outdoor heat
- heat exchanger
- defrosting
- flow path
- throttling device
- Prior art date
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Classifications
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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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
- 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
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/029—Control issues
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
Abstract
The invention discloses an air conditioner, comprising: indoor set and off-premises station, the off-premises station includes: a compressor; a flow path throttling device; two outdoor heat exchangers arranged in parallel; two defrosting switching devices, each corresponding to an outdoor heat exchanger, for switching the outdoor heat exchanger corresponding to the defrosting switching device to be communicated with the flow path throttling device, or communicated with the gas-liquid separator, or communicated with the exhaust side of the compressor; two liquid pipe throttling devices; one end of the throttling device is connected with the position where one liquid pipe throttling device is connected with the liquid side of the corresponding outdoor heat exchanger, and the other end of the throttling device is connected with the position where the other liquid pipe throttling device is connected with the corresponding outdoor heat exchanger; when one outdoor heat exchanger in the outdoor unit needs defrosting, the control device controls the outdoor heat exchanger to be defrosted to be executed as the outdoor heat exchanger to be defrosted, and the other outdoor heat exchanger to be executed as the evaporator. The invention realizes the alternate defrosting of the outdoor heat exchanger to be defrosted, realizes the indoor uninterrupted heating and improves the indoor thermal comfort.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner.
Background
The technology of air source heat pumps is becoming mature and is widely used in the domestic and commercial fields. The air source heat pump comprises indoor units and outdoor units, wherein each indoor unit is provided with a plurality of indoor heat exchangers and corresponding indoor fans, the indoor heat exchangers are arranged in parallel, each outdoor unit is provided with a variable frequency compressor, a four-way valve, a throttling element, at least one outdoor heat exchanger and an outdoor fan, which are communicated through connecting pipelines, and when at least two outdoor heat exchangers exist in one outdoor unit, the outdoor heat exchangers are arranged in parallel.
The air source heat pump has a big problem in heating operation: when outdoor temperature and humidity reach certain conditions, outdoor heat exchanger air side can frost, and along with the increase of the volume of frosting, the evaporimeter surface can be blockked up gradually, leads to outdoor heat exchanger surface heat transfer coefficient to reduce, and the gas flow resistance increases, seriously influences the machine effect of heating, consequently, the unit needs regularly to defrost.
At present, a reverse defrosting mode is mostly adopted, the reversing is mainly realized by opening a four-way valve, an outdoor unit is switched into a condenser, the defrosting is realized by utilizing the sensible heat and the latent heat of condensation of a high-temperature and high-pressure refrigerant, the defrosting speed is high, and the reliability is good. However, the heating operation is stopped during defrosting, and meanwhile, heat is absorbed from the indoor space due to the fact that the indoor heat exchanger is switched to the evaporator, the indoor temperature is obviously reduced, and indoor thermal comfort is seriously affected.
In order to solve the problems, hot gas bypass defrosting is arranged, namely, under the condition of not changing the flow direction of a system refrigerant, the exhaust gas of a compressor is led into one outdoor heat exchanger to be defrosted by using a bypass branch to defrost, and other outdoor heat exchangers still maintain heating operation, so that uninterrupted heating is realized,
The uninterrupted heating defrosting mode has the following defects: 1. the heat converted by the power consumption of the compressor is utilized for defrosting, which belongs to low-pressure defrosting, and the heat is less and the defrosting time is long; 2. when the hot gas bypass defrosting is carried out, low-pressure sensible heat is utilized for defrosting, the temperature is lower, the heat exchange temperature difference with a frost layer is small, and the defrosting reliability is poor; 3. although the flow direction of the refrigerant is not changed during defrosting, the flow rate of the refrigerant of the indoor unit is very small, the system does not supply heat to the indoor unit, the indoor temperature is reduced during defrosting, and the user comfort is poor.
Disclosure of Invention
The embodiment of the invention provides an air conditioner, which can realize pressure control defrosting of an outdoor heat exchanger to be defrosted while the air conditioner continuously heats, improves defrosting efficiency, ensures the capacity of an indoor unit to be maximized, and improves indoor thermal comfort.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
an air conditioner comprising:
an indoor unit;
an outdoor unit, comprising:
a compressor;
a flow path switching device for switching a flow path of the refrigerant discharged from the compressor;
a flow path throttling device for throttling part of the refrigerant from the compressor, the amount of the refrigerant being controlled by switching of the flow path switching device;
two outdoor heat exchangers are arranged in parallel;
the defrosting switching devices are provided with 2 devices, are respectively connected with one outdoor heat exchanger and are used for switching the outdoor heat exchanger corresponding to the defrosting switching devices to be communicated with the flow path throttling device, or communicated with the gas-liquid separator, or communicated with the exhaust side of the compressor;
the two liquid pipe throttling devices are respectively connected with the corresponding outdoor heat exchanger;
one end of the throttling device is connected with the position where one liquid pipe throttling device is connected with the liquid side of the corresponding outdoor heat exchanger, and the other end of the throttling device is connected with the position where the other liquid pipe throttling device is connected with the corresponding outdoor heat exchanger;
the control device controls the flow path switching device, the flow path throttling device, the defrosting switching device, the liquid pipe throttling device and the throttling device when one outdoor heat exchanger in the outdoor unit needs defrosting, so that the outdoor heat exchanger to be defrosted is used as the outdoor heat exchanger to be defrosted to be executed, and the rest outdoor heat exchanger is used as an evaporator to be executed;
when the outdoor heat exchanger is defrosted, the control device controls the flow path switching device to be powered on; controlling to open the flow path throttling device; controlling the defrosting switching device corresponding to the outdoor heat exchanger to be defrosted to be electrified, so that the refrigerant flowing out of the flow path throttling device is communicated with the outdoor heat exchanger to be defrosted; controlling a liquid pipe throttling device communicated with the outdoor heat exchanger to be defrosted to be closed; controlling the throttling device to be opened.
In some embodiments of the present application, the control device is further configured to:
when in refrigeration operation, the flow path switching device and the defrosting switching device are controlled to be in a power-off state, the flow path throttling device is controlled to be disconnected, and the two liquid pipe throttling devices are opened;
when the air conditioner runs in a heating mode, the flow path switching device is controlled to be powered on, the defrosting switching device is controlled to be in a power-off state, the flow path throttling device is controlled to be disconnected, and the two liquid pipe throttling devices are opened.
In some embodiments of the present application, the flow path switching device is a four-way valve, and the defrost switching device is a four-way valve or a three-way valve.
In some embodiments of the present application, the flow path throttling device is an expansion valve or a throttling capillary tube.
In some embodiments of the present application, in defrosting the outdoor heat exchanger to be defrosted, the control device is configured to:
controlling to open the throttling device, and controlling and adjusting the opening degree of the throttling device according to the outlet supercooling degree of the outdoor heat exchanger to be defrosted and the target outlet supercooling degree range;
and controlling to open the flow path throttling device, and controlling and adjusting the opening of the flow path throttling device according to the defrosting pressure and the target defrosting pressure range.
In some embodiments of the present application, the throttle device is controlled to be opened, and the opening degree of the throttle device is controlled and adjusted according to the outlet supercooling degree of the outdoor heat exchanger to be defrosted and the target outlet supercooling degree range, specifically:
setting a target outlet supercooling degree range of the outdoor heat exchanger to be defrosted;
calculating the supercooling degree of an outlet of the outdoor heat exchanger to be defrosted;
comparing whether the outlet supercooling degree is within the target outlet supercooling degree range, if so, keeping the current opening degree of the throttling device, and if not, adjusting the opening degree of the throttling device;
controlling to open the flow path throttling device, and controlling the opening degree of the flow path throttling device according to the defrosting pressure and the target defrosting pressure range, specifically:
setting a target defrosting pressure range;
calculating the defrosting pressure of the outdoor heat exchanger to be defrosted;
and comparing whether the defrosting pressure is in the target defrosting pressure range, if so, keeping the opening degree of the flow path throttling device, and if not, adjusting the opening degree of the flow path throttling device.
In some embodiments of the present application, the opening degree of the throttling device is adjusted, specifically:
when the outlet supercooling degree is larger than the upper limit value of the target outlet supercooling degree range, increasing the opening degree of the throttling device;
when the outlet supercooling degree is smaller than the lower limit value of the target outlet supercooling degree range, reducing the opening degree of the throttling device;
adjusting the opening degree of the flow path throttling device, specifically:
reducing the opening degree of the flow path throttling device when the defrosting pressure is larger than the upper limit value of the target defrosting pressure range;
and increasing the opening degree of the flow path throttling device when the defrosting pressure is smaller than the lower limit value of the target defrosting pressure range.
In some embodiments of the present application, the control device is configured to:
when the outdoor heat exchanger to be defrosted is defrosted, if the first preset defrosting time is reached, or
And if the outlet temperature of the outdoor heat exchanger to be defrosted is greater than or equal to a first temperature preset value and is maintained for a certain time period, controlling the outdoor heat exchanger to be defrosted to exit the defrosting process and enter a normal heating operation process.
In some embodiments of the present application, the outdoor unit further includes:
the two outdoor fans respectively correspond to the two outdoor heat exchangers and are connected with the control device, and each outdoor fan and the corresponding outdoor heat exchanger form an air field;
a separation device for separating adjacent wind farms;
and when defrosting is performed, the control device controls to close the outdoor fan corresponding to the outdoor heat exchanger to be defrosted.
In some embodiments of the present application, when one of the outdoor heat exchangers in the outdoor unit is defrosting, the control device controls to increase the rotation speed corresponding to the other outdoor heat exchanger.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
When the air conditioner provided by the invention is used for defrosting the outdoor heat exchanger, the control device controls the flow path switching device to be opened; controlling to open the flow path throttling device; controlling the defrosting switching device to enable the refrigerant flowing out of the flow path throttling device to be communicated with a main air pipe of the outdoor heat exchanger to be defrosted; controlling a liquid pipe throttling device communicated with the outdoor heat exchanger to be defrosted to be closed; controlling the throttling device to be opened. When the air conditioner performs alternate defrosting, the control flow path switching device is controlled to be opened, the control liquid pipe throttling device is cut off, the control flow path throttling device is controlled to be opened, the control defrosting switching device enables the refrigerant flowing out of the flow throttling device to be communicated with a main air pipe of the outdoor heat exchanger to be defrosted, the control throttling device is controlled to be opened, the defrosting pressure of the outdoor heat exchanger to be defrosted can be controlled, so that the defrosting is achieved by using latent heat of the refrigerant, the defrosting speed is high, the capacity of an indoor unit is maximized, uninterrupted heating of the air conditioner is achieved, the thermal comfort of a user is met, and the indoor temperature rising speed after defrosting is.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a system structure diagram of an embodiment of an air conditioner according to the present invention;
FIG. 2 is a flow chart of defrosting an outdoor heat exchanger in an embodiment of the air conditioner according to the present invention;
fig. 3 is a refrigerant flow diagram corresponding to a refrigeration state of an embodiment of the air conditioner provided by the invention;
fig. 4 is a refrigerant flow diagram corresponding to a heating state in an embodiment of the air conditioner of the present invention;
fig. 5 is a graph showing the variation of indoor temperature when the air conditioner of the present invention is in different defrosting modes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
[ basic operation principle of air conditioner ]
A refrigeration cycle of an air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. 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 expansion valve 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 expansion valve 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 conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of an air conditioner refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the indoor unit of an air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit of an air conditioner.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
[ air-conditioner ]
In the present application, the outdoor unit is the air conditioning outdoor unit described above.
The air conditioner includes an indoor unit and an outdoor unit.
The indoor unit may correspondingly include a plurality of indoor heat exchangers, for example, in some embodiments, the indoor unit includes 2 indoor heat exchangers, which are the indoor heat exchangers 191 and 192 and an indoor fan (not shown), and 2, 2 indoor fans are provided and used to blow cold air or hot air generated by the indoor heat exchangers 191 and 192 to the indoor space.
The air conditioner also comprises an outdoor unit.
The outdoor unit comprises a compressor, a flow path switching device, a flow path throttling device, two outdoor heat exchangers arranged in parallel, two defrosting switching devices corresponding to the two outdoor heat exchangers, two liquid pipe throttling devices, two outdoor fans, a throttling device and a gas-liquid separator.
The number of the outdoor heat exchangers in the outdoor unit is two.
The outdoor unit includes a compressor 1, a flow path switching device 33, a flow path throttling device 4, two outdoor heat exchangers 61 and 62 arranged in parallel, two defrosting switching devices 31 and 32 corresponding to the outdoor heat exchangers 61 and 62, two liquid pipe throttling devices 71 and 72, two outdoor fans 121 and 122, one throttling device 8, and a gas-liquid separator 2, respectively.
The flow path switching device 33 switches the flow path of the refrigerant discharged from the compressor 1 to the indoor unit or the outdoor heat exchanger. In the present application, the flow path switching device 33 is a four-way valve having four terminals C, D, S and E. The flow path switching device 33 may be a pilot type three-way valve or another low resistance three-way valve.
When the flow switching device 33 is powered off, the default is that C and D are connected and S and E are connected, so that the indoor heat exchangers 191 and 192 function as evaporators and the outdoor heat exchangers 61 and 62 function as condensers, and the air conditioner performs cooling.
When the four-way valve is electrically switched, C is connected to S, and D is connected to E, so that the indoor heat exchangers 191 and 192 are used as condensers, the outdoor heat exchangers 61 and 62 are used as evaporators, and the air conditioner heats.
In the present application, when the outdoor heat exchanger 61 and the outdoor heat exchanger 62 in the outdoor unit perform defrosting, the defrosting is performed alternately, that is, when the outdoor heat exchanger 61 performs defrosting, the outdoor heat exchanger 62 performs heating operation, and when the outdoor heat exchanger performs defrosting, the outdoor heat exchanger 61 performs heating operation, thereby achieving uninterrupted heating for defrosting.
Referring to fig. 1, the number of the outdoor heat exchangers is the same as that of the outdoor fans and corresponds to one another.
In the present application, the flow path expansion device 4, the liquid pipe expansion device 71/72, and the expansion device 8 may be each a fixed opening degree expansion element such as an electronic expansion valve, a two-way thermostatic expansion valve, or a capillary tube.
The flow path throttling device 4 and the throttling device 8 can be matched with each other, and are used for adjusting defrosting pressure when one outdoor heat exchanger is defrosted, so that heat waste caused by overhigh defrosting pressure is further prevented.
In the outdoor unit, the defrosting switching device 31/32 is a four-way valve having four terminals C, D, S and E, and when power is off by default, C and D are connected and S and E are connected, and when power is on, C and S are connected and D and E are connected. The two defrost switching devices 31 and 32 may also be pilot type three-way valves or other low resistance three-way valves.
Referring to fig. 1, when the refrigerant discharged from the compressor 1 flows out through the check valve 2 and is switched by the flow switching device 33, the refrigerant enters the outdoor side, and first passes through the flow throttling device 4.
The refrigerant throttled by the flow throttling device 4 selectively enters the outdoor heat exchanger 61 or 62, i.e., alternately flows into the outdoor heat exchangers 61 and 62, depending on the state of the defrosting switching device 31/32 of the outdoor heat exchanger 61/62.
The part of the refrigerant discharged from the compressor 1 switched by the flow path switching device 33 can be throttled to an appropriate pressure by the flow path throttling device 4 and enters the outdoor heat exchanger 61 through the defrosting switching device 31 to be subjected to heat exchange defrosting.
The part of the refrigerant discharged from the compressor 1 switched by the flow path switching device 33 can be throttled to an appropriate pressure by the flow path throttling device 4 and enters the outdoor heat exchanger 62 through the defrosting switching device 32 to be subjected to heat exchange defrosting.
The control means is for controlling the flow path switching means 33, the flow path throttling means 4, the first control valve 18, the defrosting switching means 31 and 32, the liquid pipe throttling means 71 and 72, and the throttling means 8 in the outdoor unit to defrost one outdoor heat exchanger in the outdoor unit.
[ operation mode of air conditioner ]
Referring to fig. 1, the air conditioner has a normal heating operation mode, a normal cooling operation mode, a reverse defrosting operation mode, and a shift defrosting operation mode.
Heating mode of operation in general
The heating operation mode is not different from the common heating operation mode of the air conditioner.
Referring to fig. 1, in some embodiments, when the air conditioner is in the normal heating operation mode, the flow path switching device 33 is controlled to be powered on, the flow path throttling device 4 is opened, the defrosting switching devices 31 and 32 are both powered off and closed, the liquid pipe throttling devices 71 and 72 are both opened, the outdoor fans 121 and 122 are both opened, and the throttling device 8 is closed.
Namely correspondingly: c and E of the defrost switching devices 31 and 32 are communicated, and E and S are communicated.
In some embodiments, flow switching device 33 is electrically switched such that D and E are in communication and C and S are in communication. The exhaust gas of the high-temperature and high-pressure compressor 1 flows to the indoor heat exchangers 191 and 192 after passing through the flow path switching device 33, the stop valve 13, and the indoor-outdoor machine connecting pipe 16, the refrigerant is cooled to a high-pressure and medium-temperature liquid refrigerant in the indoor heat exchangers 191 and 192 and is heated, the refrigerant flows back to the outdoor machine after passing through the expansion valve 201/202, the indoor-outdoor machine connecting pipe 117, and the stop valve 14, the refrigerant is throttled by the expansion valves 71 and 72 in the outdoor machine and is changed into a low-temperature and low-pressure two-phase refrigerant, the two-phase refrigerant enters the outdoor heat exchangers 61 and 62 and is evaporated into a low-temperature and low-pressure gaseous refrigerant, and the evaporated refrigerant flows to the gas-liquid splitter 2.
The refrigerant coming out of the outdoor heat exchangers 61 and 62 enters the gas-liquid separator 2 through C and S of the defrosting switching devices 31 and 32, and is finally sucked into the compressor 1 to be compressed, thereby completing the heating cycle.
The outdoor fans 121 and 122 are always turned on throughout the normal heating operation mode.
Normal cooling mode of operation
The normal cooling operation mode is the same as the normal cooling operation mode of the air conditioner.
When the air conditioner is in a normal cooling operation mode, the flow path switching device 33 and the defrosting switching devices 31 and 32 are controlled to be in a power-off state, the liquid pipe throttling devices 71 and 72 are both opened, the outdoor fans 121 and 122 are both opened, and the throttling device 8 is switched off.
Wherein D and C and S and E in the defrost switching devices 31 and 32 are communicated.
The flow path switching device 33 is turned off and closed, default D and C are communicated and E and S are communicated, the high temperature and high pressure compressor discharge air flows to the outdoor heat exchangers 61, 62 through the C, D end of the flow path switching device 33 and the S, E end of the defrost switching devices 31 and 32, the refrigerant is cooled to a high-pressure medium-temperature liquid refrigerant in the outdoor heat exchangers 61 and 62, flows to the indoor unit through the expansion valve 71/72, the stop valve 14 and the indoor-outdoor unit connecting pipe 117, the refrigerant is throttled by the expansion valves 201 and 202 in the indoor unit and then changed into a low-temperature and low-pressure two-phase refrigerant, the two-phase refrigerant enters the indoor unit heat exchangers 191 and 192 to be evaporated into a low-temperature and low-pressure gaseous refrigerant and cool the indoor environment, and the evaporated refrigerant enters the gas-liquid separator 2 through the indoor and outdoor unit connecting pipe 16, the stop valve 13 and the ends E and S of the flow switching device 33 and enters the compressor to be compressed, so that the refrigeration cycle is completed.
The outdoor fans 121 and 122 are always turned on throughout the normal cooling operation mode.
Reverse defrost mode of operation
When the control device of the air conditioner detects that it is determined that the outdoor heat exchanger 61 or 62 needs defrosting, the compressor 1 first performs down-conversion or directly stops, and the indoor fans and the outdoor fans 121 and 122 in the outdoor unit stop operating.
Thereafter, the air conditioner is operated in the normal cooling operation mode, all the outdoor heat exchangers 61 and 62 are operated as condensers, and defrosting is started, that is, heating of all the indoor units is stopped and all the outdoor heat exchangers are defrosted.
After the defrosting is completed, the air conditioner re-enters the normal heating operation mode.
The reverse defrosting operation mode has the advantages of clean defrosting, but also has a plurality of defects (1) that the heating operation is stopped during defrosting, the indoor temperature is obviously reduced, and the use comfort of users is influenced; (2) during defrosting, the flow direction of the refrigerant needs to be changed, and particularly during heating operation after defrosting, because a large amount of refrigerant is stored in the gas-liquid separator 2 in the defrosting process, the high-low pressure difference is slowly established after defrosting, the heating capacity is low, and the heating cycle capacity of the sound is severe.
Alternate defrost mode of operation
The alternate defrosting operation mode is operated under the conditions that the outdoor heat exchanger needs to be defrosted and the indoor unit still needs to have certain heating capacity, so that the air conditioner can keep heating continuously while the outdoor heat exchanger to be defrosted (namely, the outdoor heat exchanger to be defrosted) is defrosted, the indoor temperature fluctuation is reduced, and the heating comfort of a user is enhanced.
In the defrosting process, the defrosting pressure of the outdoor heat exchanger to be defrosted is controlled, the latent heat of the refrigerant is utilized for defrosting, compared with hot gas bypass defrosting, sensible heat defrosting is utilized, the defrosting efficiency is high, the defrosting time is short, the heat acquired by the indoor unit is large, and the user comfort level is high.
When 2 outdoor heat exchangers of the outdoor unit need defrosting, the 2 outdoor heat exchangers to be defrosted execute a rotation defrosting operation mode.
In some embodiments, referring to fig. 1, an example of the outdoor heat exchangers 61 and 62 in the outdoor unit performing the defrosting operation alternately is described, in which both the outdoor heat exchangers 61 and 62 of the outdoor unit perform a normal heating operation mode.
S1: the process begins.
S2: the air conditioner performs a general heating operation mode.
S3: it is determined whether or not the outdoor heat exchangers 61 and 62 satisfy the defrosting condition, and if so, the routine proceeds to S4, and if not, the normal heating operation mode of S2 is continuously performed.
The defrosting condition can be judged according to the existing judgment basis, for example, the running time of the compressor 1 and the temperature difference between the ambient temperature and the outdoor unit coil temperature are taken as the criterion.
S4: and sequentially executing a rotation defrosting operation mode aiming at a plurality of outdoor heat exchangers to be defrosted.
The outdoor heat exchangers 61 and 62 are alternately defrosted according to the frosting amount of the outdoor heat exchangers 61 and 62 to be defrosted.
The outdoor heat exchangers 61 and 62 may be sequentially defrosted in order of the frost formation amount from large to small.
The judgment of the frosting amount can be performed by detecting an index indicative of the frosting amount by a detection means (not shown), for example, at least one of the heating capacity of the outdoor heat exchangers 61 and 62, the evaporation temperature of the refrigerant, the indoor-unit blow-out temperature, the liquid pipe temperature of the outdoor heat exchanger, and the like, and predicting the frosting amount of the outdoor heat exchangers 62 and 62 based on the variation of the detection value.
For example, the frost formation amount is determined by the liquid pipe temperature of the outdoor heat exchanger, and the frost formation amount increases as the liquid pipe temperature of the outdoor heat exchanger decreases.
Assuming that the frost formation amount of the outdoor heat exchanger 61 is greater than that of the outdoor heat exchanger 62, the outdoor heat exchanger 61 should be defrosted first to avoid the normal operation of the outdoor heat exchanger 61 being affected by excessive frost formation. The outdoor heat exchanger 62 is in the normal heating operation mode at this time.
That is, the outdoor heat exchanger 61 is implemented as an outdoor heat exchanger to be defrosted, and the outdoor heat exchanger 62 is implemented as an evaporator.
After the defrosting of the outdoor heat exchanger 61 is completed and the normal heating operation mode is entered, the outdoor heat exchanger 62 is defrosted.
That is, switching the outdoor heat exchanger 62 is performed as an outdoor heat exchanger to be defrosted, and the outdoor heat exchanger 61 is performed as an evaporator.
The reverse defrosting operation mode may be selected to perform a defrosting operation on the outdoor heat exchangers 61 and 62 by turns for a plurality of times, so as to completely defrost the outdoor heat exchangers 61 and 62. Of course, the reverse defrost mode of operation may be selected under other conditions.
The process of defrosting the outdoor heat exchanger to be defrosted is described as follows.
S41: the flow path switching device 33 is controlled to be powered on, the flow path throttling device 4 and the defrosting switching device 31/32 are controlled to make part of the refrigerant discharged from the compressor 1 enter the outdoor heat exchanger to be defrosted through the flow path throttling device 4 and the defrosting switching device 31/32, the liquid pipe throttling device communicated with the outdoor heat exchanger to be defrosted is cut off, the throttling device 8 is controlled to be opened, and the other outdoor heat exchanger is operated as an evaporator.
The description will be given taking as an example that the outdoor heat exchanger 61 in the outdoor unit module is implemented as an outdoor heat exchanger to be defrosted to enter a defrosting process, and the outdoor heat exchanger 62 is implemented as an evaporator to maintain a normal heating operation process.
The flow path switching device 33 is kept in the power-on open state, the control flow path throttling device 4 is opened, the defrosting switching device 31 is powered on and opened, the defrosting switching device 32 is powered off and closed, the outdoor fan 121 is turned off, the liquid pipe throttling device 71 is turned off, the throttling device 8 is opened, and the rest of the devices are kept in the same state as in the normal heating operation mode.
The flow path switching device 33, the flow path throttling device 4, the defrosting switching device 32/31, the outdoor fan 121, the liquid pipe throttling device 71, and the throttling device 8 are all components in the outdoor unit.
When entering the alternate defrosting operation mode, the high-temperature and high-pressure compressor exhaust (2 point) is divided into two paths: one path of the refrigerant enters the indoor unit through the flow path switching device 33, the stop valve 13 and the connecting pipe 16 to be condensed and heated (2-3 processes), the heated medium-temperature high-pressure liquid refrigerant flows to the outdoor unit, and is throttled by the liquid pipe throttling device 72 to become a low-temperature low-pressure gas-liquid two-phase refrigerant (4 points); the other path of the refrigerant is throttled by the expansion valve 4 and becomes a medium-pressure high-temperature gaseous refrigerant (5 points), and enters the outdoor heat exchanger 61 through the defrosting switching device 31 to be condensed and release heat for defrosting (5-6 processes), and the condensed medium-pressure medium-temperature liquid refrigerant is throttled by the throttling device 8 and becomes a low-temperature low-pressure gas-liquid two-phase refrigerant (7 points); the two low-temperature low-pressure gas-liquid two-phase refrigerants are mixed ((4 + 7) → 8) in the main liquid pipe of the outdoor heat exchanger 62 and then enter the main liquid pipe 62 to be evaporated, and the evaporated low-temperature low-pressure gas refrigerant flows to the gas-liquid splitter 2 through the defrosting switching device 32 and the flow path switching device 33 and then enters the compressor to be compressed.
When one outdoor heat exchanger in the outdoor unit is defrosted, aiming at the outdoor heat exchanger to be defrosted, such as the outdoor heat exchanger 61, the opening degree of the throttling device 8 is controlled and adjusted according to the outlet supercooling degree of the outdoor heat exchanger 61 and the target outlet supercooling degree range, so that the outlet supercooling degree of the outdoor heat exchanger 61 tends to be maintained in the target outlet supercooling degree range; according to the defrosting pressure and the target defrosting pressure range, the opening degree of the flow path throttling device 4 is controlled and adjusted, so that the defrosting pressure of the compressor 1 tends to be maintained in the target defrosting pressure range, the outlet temperature and the defrosting pressure of the heat exchanger are ensured, the defrosting time is shortened, the defrosting speed and efficiency are improved, the capacity of an indoor unit can be maximized when the air conditioner continuously heats and defrosts, and the indoor thermal comfort of a user is improved.
When defrosting the outdoor heat exchanger 61, the opening degrees of the expansion device 8 and the flow path expansion device 4 are controlled.
Before entering the defrosting process, it is necessary to set the initial opening degrees of the defrosting time throttle device 8 and the flow path throttle device 4.
For example, since both the pre-defrosting flow path throttling device 4 and the throttling device 8 are off, it is necessary to set an initial opening degree (for example, fully open) of the flow path throttling device 4 and an initial opening degree (for example, fully open) of the throttling device 8 during defrosting before defrosting.
S1': a target outlet supercooling degree range of the outdoor heat exchanger 61 and a target defrosting pressure range are set.
In the present application, there is a range for the target outlet supercooling degree Te1sco, for example, 0 ℃ C. ltoreq. Te1 sco. ltoreq.10 ℃.
A target outlet supercooling degree range (Te 1sco- λ, Te1sco + λ) is set, for example, 0 ℃ < λ < 3 ℃ based on the target outlet supercooling degree Te1 sco.
In the present application, the target defrosting pressure Pfo is a function Pfo = f (T) of the ambient temperature T, and the function Pfo = f (T) may be a preset function determined when the air conditioner is commissioned.
When the ambient temperature sensor detects the ambient temperature T, the target defrosting pressure Pfo can be known from the function f (T).
A target defrosting pressure range (Pfo-delta, Pfo + delta) is set, for example, 0MP < delta < 0.5MP, based on the target defrosting pressure Pfo.
S2': the outlet supercooling degree Te1sco of the outdoor heat exchanger 61 is calculated.
The outlet supercooling degree Te1sc of the outdoor heat exchanger 61 is calculated by the defrosting pressure Pf (detected by the pressure sensor 231) and the outlet temperature Te1 (detected by the temperature sensor 231) of the outdoor heat exchanger 61.
That is, Te1sc = Tec-Te 1, where Tec is the corresponding saturation temperature at the defrost pressure Pf, which can be obtained by prior art queries.
S3': comparing whether the outlet supercooling degree Te1sc is in the target outlet supercooling degree range;
s31': if the outlet supercooling degree Te1sc is in the target outlet supercooling degree range, keeping the opening degree of the throttling device 8 and executing to S4'; if not, the opening degree of the throttle device 8 is adjusted, and the process proceeds to S4'.
The procedure of specifically adjusting the opening degree of the throttle device 8 is described as follows.
S32': if the outlet supercooling degree Te1sc is larger than the upper limit value of the target outlet supercooling degree range, the opening degree of the throttle device 8 is increased by one adjustment step number, and execution is carried out to S4'.
That is, the next opening degree EV8(n +1) = EV8(n) - Δ EV8 of the throttle device 8, where Δ EV8 is the number of adjustment steps, where the number of adjustment steps can be selected to be 0.1% -10% pls (i.e., the number of steps) of the total opening degree.
S33': if the outlet supercooling degree Te1sc is smaller than the lower limit value of the target outlet supercooling degree range, the opening degree of the throttle device 8 is decreased by one adjustment step number, and execution is carried out to S4'.
That is, the next opening degree EV8(n +1) = EV8(n) + Δ EV8 of the throttle device 8, where Δ EV8 is the number of adjustment steps, where the number of adjustment steps can be selected to be 0.1% -10% pls (i.e., the number of steps) of the total opening degree.
S4': whether the defrosting pressure Pf is within the target defrosting pressure range is compared, if so, the opening degree of the flow path throttling means 4 is maintained, and execution goes to S42, and if not, the opening degree of the flow path throttling means 4 is adjusted, and execution goes to S42.
The process of specifically adjusting the opening degree of the flow path throttling device 4 is described below.
S41': if the defrosting pressure Pf is within the target defrosting pressure range, the opening degree of the flow path throttling device 4 is maintained, and the process proceeds to S42.
S42': if the defrosting pressure Pf is greater than the upper limit value of the target defrosting pressure range, the opening degree of the flow path throttling means 4 is decreased by one adjustment step number, and execution proceeds to S42.
That is, the next opening degree EV1117(n +1) = EV1117(n) - Δ EV1117 of the flow path throttling device 4, where Δ EV1117 is the number of adjustment steps, where the number of adjustment steps can be selected to be 0.1% to 10% pls (i.e., the number of steps) of the total opening degree.
S43': if the defrosting pressure Pf is less than the lower limit value of the target defrosting pressure range, the opening degree of the flow path throttling means 4 is increased by one adjustment step number, and execution proceeds to S42.
That is, the next opening degree EV1117(n +1) = EV1117(n) + Δ EV1117 of the flow path throttling device 4, where Δ EV1117 is the number of adjustment steps, where the number of adjustment steps can be selected to be 0.1% to 10% pls (i.e., the number of steps) of the total opening degree.
S42: and judging whether defrosting is finished or not, if so, exiting the defrosting process, otherwise, returning to S2', and adjusting the opening degrees of the throttling device 8 and the flow path throttling device 4 again.
As the defrosting end condition, it may be determined whether the defrosting time period T1 reaches a first preset time T1, or whether the outlet temperature Te1 of the outdoor heat exchanger 61 is equal to or greater than a first preset temperature Tef (e.g., 2 ℃ < Tef < 32 ℃) and is maintained for a certain time period T; and if one of the two conditions is met, indicating that the defrosting is finished, otherwise, continuing to judge.
Of course, the defrosting end condition is not limited to this, and for example, it may be determined by using whether or not the air pipe temperature Tg of the outdoor heat exchanger 61 is equal to or higher than the set temperature Tn and whether or not the suction pressure Ps of the compressor 1 is equal to or higher than the set pressure Po; alternatively, the number of times of adjusting the opening degrees of the throttle device 8 and the flow path throttle device 4 may be used.
Although S3 'is performed before S4' as described above, the order of S3 'and S4' is not limited, i.e., S4 'may also be performed before S3'.
After the defrosting of the outdoor heat exchanger 61 is finished, the defrosting process is exited, and thereafter, the normal heating operation process is performed.
The outdoor heat exchanger 61 exits the defrosting process and enters the normal heating operation process, which at least comprises the following steps:
(1) controlling the defrosting switching device 31 to be electrically opened, and enabling the gas side of the outdoor heat exchanger 61 to be defrosted to be communicated with the gas-liquid separator 2;
(2) turning on the outdoor fan 121;
(3) opening the tube restriction 71;
as for the throttle device 8, it is possible to select an arbitrary opening degree (preferably, close) when the outdoor heat exchanger 61 enters the normal heating operation process.
As for the flow path throttling means 4, if the outdoor heat exchanger 61 exits the defrosting process without defrosting the other outdoor heat exchangers, and thereafter enters the normal heating operation process, the flow path throttling means 4 may be at an arbitrary opening degree.
During defrosting, the indoor side throttling devices 201 and 202 maintain control before defrosting, the throttling device 72 maintains normal heating control, namely, the outlet superheat degree Ts2 of the outdoor heat exchanger 62 is controlled, namely, the temperature sensor 233 detects the exhaust temperature Td2, the pressure sensor 222 detects the exhaust pressure Pd2, the outlet superheat degree Ts2 of the outdoor heat exchanger 62 is the difference between the exhaust temperature Td2 and the saturation temperature corresponding to the exhaust pressure Pd2, and the outlet superheat degree Ts2 is controlled within 0-2 ℃.
Similarly, when the outdoor heat exchanger 61 exits defrosting and the outdoor heat exchanger 62 performs defrosting, the throttle device 71 is also used to control the outlet superheat degree of the outdoor heat exchanger 61 to be within 0-2 ℃.
Thereafter, the outdoor heat exchanger 62, which is an outdoor heat exchanger to be defrosted, enters the defrosting process, and the outdoor heat exchanger 61, which is an evaporator, maintains the normal heating operation process.
The flow path switching device 33 is maintained in the open power-on state, the flow path throttling device 4 is kept open and the first control valve 18 is closed, the defrosting switching device 32 is closed by controlling the power-off, the throttling device 8 is opened, the outdoor fan 122 and the pipe throttling device 72 are closed, and the rest of the devices are maintained in the same state as in the normal heating operation mode.
The defrosting process of the outdoor heat exchanger 62 is referred to as the defrosting process of the outdoor heat exchanger 61.
When the outdoor heat exchanger 62 performs defrosting, the outdoor heat exchanger 61 performs a normal heating operation process.
[ separation of wind field ]
Since the corresponding outdoor fan 122 of the outdoor heat exchanger 62 is kept in operation during defrosting of the outdoor heat exchanger 61, in order to avoid the situation that the outdoor heat exchanger 61 cannot be effectively defrosted due to the wind field generated by the outdoor fan 122 blowing through the outdoor heat exchanger 61, in the present application, a partition device 101 for partitioning the wind field is provided (see patent document No. 26261027117447.2 entitled "outdoor unit of air conditioner").
In the present application, the outdoor fans 121 and 122 are respectively and independently controlled by the control device, and the outdoor heat exchanger 61 and the outdoor fan 121 form a first wind field, and the outdoor heat exchanger 62 and the outdoor fan 122 form a second wind field, and the partition device 101 is used to separate the first wind field and the second wind field.
That is, it does not blow wind to the outdoor heat exchanger 62 when the outdoor fan 121 is operated and the outdoor fan 122 is not operated, and it does not blow wind to the outdoor heat exchanger 61 when the outdoor fan 122 is operated and the outdoor fan 121 is not operated.
In this way, when the outdoor heat exchanger 61 performs defrosting, the partition 101 separates the first wind field and the second wind field, and therefore, even if the outdoor fan 122 is still operating, the first wind field is not affected.
Therefore, the situation that the air blows over the surface of the outdoor heat exchanger 61 when defrosting is carried out is effectively avoided, the situation that the defrosting cannot be effectively carried out due to overlarge condensation load when the outdoor temperature is low is further prevented, and uninterrupted heating of the full-temperature area can be achieved.
In addition, when the outdoor fan 121 stops operating (i.e., the outdoor heat exchanger 61 is defrosting), the rotation speed of the outdoor fan 122 can be appropriately increased, the heating effect is further enhanced, the indoor temperature fluctuation is reduced, and the heating capacity of the air conditioner and the heating comfort of users are greatly improved.
And when the outdoor heat exchanger 61 exits the defrosting process and enters the normal heating operation process, the outdoor fan 122 of the outdoor heat exchanger 62 is turned off corresponding to the turning on of the outdoor fan 121.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. An air conditioner, comprising:
an indoor unit;
an outdoor unit, comprising:
a compressor;
a flow path switching device for switching a flow path of the refrigerant discharged from the compressor;
a flow path throttling device for throttling part of the refrigerant from the compressor, the amount of the refrigerant being controlled by switching of the flow path switching device;
two outdoor heat exchangers are arranged in parallel;
the defrosting switching devices are provided with 2 devices, are respectively connected with one outdoor heat exchanger and are used for switching the outdoor heat exchanger corresponding to the defrosting switching devices to be communicated with the flow path throttling device, or communicated with the gas-liquid separator, or communicated with the exhaust side of the compressor;
the two liquid pipe throttling devices are respectively connected with the corresponding outdoor heat exchanger;
one end of the throttling device is connected with the position where one liquid pipe throttling device is connected with the liquid side of the corresponding outdoor heat exchanger, and the other end of the throttling device is connected with the position where the other liquid pipe throttling device is connected with the corresponding outdoor heat exchanger;
the control device controls the flow path switching device, the flow path throttling device, the defrosting switching device, the liquid pipe throttling device and the throttling device when one outdoor heat exchanger in the outdoor unit needs defrosting, so that the outdoor heat exchanger to be defrosted is used as the outdoor heat exchanger to be defrosted to be executed, and the rest outdoor heat exchanger is used as an evaporator to be executed;
when the outdoor heat exchanger is defrosted, the control device controls the flow path switching device to be powered on; controlling to open the flow path throttling device; controlling the defrosting switching device corresponding to the outdoor heat exchanger to be defrosted to be electrified, so that the refrigerant flowing out of the flow path throttling device is communicated with the outdoor heat exchanger to be defrosted; controlling a liquid pipe throttling device communicated with the outdoor heat exchanger to be defrosted to be closed; controlling the throttling device to be opened.
2. The air conditioner of claim 1, wherein the control device is further configured to:
when in refrigeration operation, the flow path switching device and the defrosting switching device are controlled to be in a power-off state, the flow path throttling device is controlled to be disconnected, and the two liquid pipe throttling devices are opened;
when the air conditioner runs in a heating mode, the flow path switching device is controlled to be powered on, the defrosting switching device is controlled to be in a power-off state, the flow path throttling device is controlled to be disconnected, and the two liquid pipe throttling devices are opened.
3. The air conditioner according to claim 1, wherein the flow path switching means is a four-way valve, and the defrosting switching means is a four-way valve or a three-way valve.
4. The air conditioner according to claim 1, wherein the flow path throttling means is an expansion valve or a throttling capillary tube.
5. The air conditioner according to claim 1,
when defrosting the outdoor heat exchanger to be defrosted, the control device is configured to:
controlling to open the throttling device, and controlling and adjusting the opening degree of the throttling device according to the outlet supercooling degree of the outdoor heat exchanger to be defrosted and the target outlet supercooling degree range;
and controlling to open the flow path throttling device, and controlling and adjusting the opening of the flow path throttling device according to the defrosting pressure and the target defrosting pressure range.
6. The air conditioner according to claim 5,
controlling and opening the throttling device, and controlling and adjusting the opening degree of the throttling device according to the outlet supercooling degree of the outdoor heat exchanger to be defrosted and the target outlet supercooling degree range, wherein the method specifically comprises the following steps:
setting a target outlet supercooling degree range of the outdoor heat exchanger to be defrosted;
calculating the supercooling degree of an outlet of the outdoor heat exchanger to be defrosted;
comparing whether the outlet supercooling degree is within the target outlet supercooling degree range, if so, keeping the current opening degree of the throttling device, and if not, adjusting the opening degree of the throttling device;
controlling to open the flow path throttling device, and controlling the opening degree of the flow path throttling device according to the defrosting pressure and the target defrosting pressure range, specifically:
setting a target defrosting pressure range;
calculating the defrosting pressure of the outdoor heat exchanger to be defrosted;
and comparing whether the defrosting pressure is in the target defrosting pressure range, if so, keeping the opening degree of the flow path throttling device, and if not, adjusting the opening degree of the flow path throttling device.
7. The air conditioner according to claim 6,
adjusting the opening degree of the throttling device, specifically:
when the outlet supercooling degree is larger than the upper limit value of the target outlet supercooling degree range, increasing the opening degree of the throttling device;
when the outlet supercooling degree is smaller than the lower limit value of the target outlet supercooling degree range, reducing the opening degree of the throttling device;
adjusting the opening degree of the flow path throttling device, specifically:
reducing the opening degree of the flow path throttling device when the defrosting pressure is larger than the upper limit value of the target defrosting pressure range;
and increasing the opening degree of the flow path throttling device when the defrosting pressure is smaller than the lower limit value of the target defrosting pressure range.
8. The air conditioner according to any one of claims 5 to 7, wherein the control device is configured to:
when the outdoor heat exchanger to be defrosted is defrosted, if the first preset defrosting time is reached, or
And if the outlet temperature of the outdoor heat exchanger to be defrosted is greater than or equal to a first temperature preset value and is maintained for a certain time period, controlling the outdoor heat exchanger to be defrosted to exit the defrosting process and enter a normal heating operation process.
9. The air conditioner as claimed in claim 8, wherein the outdoor unit further comprises:
the two outdoor fans respectively correspond to the two outdoor heat exchangers and are connected with the control device, and each outdoor fan and the corresponding outdoor heat exchanger form an air field;
a separation device for separating adjacent wind farms;
and when defrosting is performed, the control device controls to close the outdoor fan corresponding to the outdoor heat exchanger to be defrosted.
10. The air conditioner according to claim 7,
when one of the outdoor heat exchangers in the outdoor unit is defrosting, the control device controls the rotating speed corresponding to the other outdoor heat exchanger to be increased.
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| CN114484741A (en) * | 2022-01-29 | 2022-05-13 | 青岛海尔空调电子有限公司 | Defrosting control method for air conditioning system and air conditioning system |
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