CN111425949A - Heat pump air conditioning system and control method thereof - Google Patents
Heat pump air conditioning system and control method thereof Download PDFInfo
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- CN111425949A CN111425949A CN202010168224.9A CN202010168224A CN111425949A CN 111425949 A CN111425949 A CN 111425949A CN 202010168224 A CN202010168224 A CN 202010168224A CN 111425949 A CN111425949 A CN 111425949A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010257 thawing Methods 0.000 claims abstract description 98
- 238000005338 heat storage Methods 0.000 claims description 40
- 238000005485 electric heating Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000003507 refrigerant Substances 0.000 description 40
- 238000010586 diagram Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
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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
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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
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
According to the heat pump air-conditioning system and the control method thereof, the heat exchange loop is provided with the first external machine heat exchanger and the second external machine heat exchanger in parallel, and the second throttling device is additionally arranged in front of the second external machine heat exchanger, so that the temperature of a working medium flowing through the second external machine heat exchanger is lower than that of a working medium flowing through the first external machine heat exchanger during heating; and the air flow which is subjected to heat exchange by the first and second external machine heat exchangers firstly flows through the second external machine heat exchanger for heat exchange and then is subjected to heat exchange with the first external machine heat exchanger. After the air current flows through the second outer machine heat exchanger, the humidity of the air current is obviously reduced, so that the frosting of the first outer machine heat exchanger can be reduced, and the heating effect is ensured to a certain extent. According to the invention, preferably, the defrosting pipeline is arranged at the outlet of the compressor, so that the conversion between bypass defrosting and non-bypass defrosting can be realized, the heat pump air conditioning system continuously supplies heat during defrosting, and the comfort level of a user is improved.
Description
Technical Field
The invention belongs to the field of air conditioners, and particularly relates to a heat pump air conditioning system and a control method thereof.
Background
In an outdoor low-temperature environment, when the heat pump air conditioner operates in a heating mode, the surface temperature of an outdoor heat exchanger is low, and when the surface temperature is lower than 0 ℃, the surface of the heat exchanger is easy to frost, so that the heating effect of the air conditioner is seriously influenced. In the related art, the defrosting mode mostly utilizes the exhaust temperature of a compressor to carry out hot gas defrosting, and the four-way valve is used for reversing and converting the exhaust temperature into a refrigeration mode, so that an outdoor heat exchanger releases heat and an indoor heat exchanger absorbs heat, the indoor environment temperature is reduced in such a mode, and in a cold environment, the room temperature is suddenly cooled and suddenly heated, so that the comfort is reduced; in the environment with higher relative humidity, frosting is easy to occur, so that frequent defrosting of the unit is caused, heat supply is influenced, and meanwhile, the service life of the four-way valve and other devices is also influenced.
The existing heat pump air conditioner has the following problems: 1. the external machine heat exchanger is easy to frost and cannot ensure the heating effect; 2. stopping the compressor during defrosting in a conventional defrosting mode; 3. the heat supply is stopped indoors during defrosting in a conventional defrosting mode, and the comfort level of the room is reduced; 4. the conventional defrosting speed is slow, so that the defrosting time is long, and the heating performance of the heat pump is influenced; 5. in a low-temperature environment, the performance of the heat pump air conditioner is reduced, and the heat supply amount is insufficient.
Disclosure of Invention
In view of the above, the present invention provides a heat pump air conditioning system and a control method thereof, wherein a heat exchange loop is provided with a first external machine heat exchanger and a second external machine heat exchanger in parallel, and a second throttling device is additionally arranged in front of the second external machine heat exchanger, so that the temperature of a working medium flowing through the second external machine heat exchanger is lower than that of a working medium flowing through the first external machine heat exchanger during heating; and the air flow which is subjected to heat exchange by the first and second external machine heat exchangers firstly flows through the second external machine heat exchanger for heat exchange and then is subjected to heat exchange with the first external machine heat exchanger. After the air current flows through the second outer machine heat exchanger, the humidity of the air current is obviously reduced, so that the frosting of the first outer machine heat exchanger can be reduced, and the heating effect is ensured to a certain extent. According to the invention, preferably, the defrosting pipeline is arranged at the outlet of the compressor, so that the conversion between bypass defrosting and non-bypass defrosting can be realized, the heat pump air conditioning system continuously supplies heat during defrosting, and the comfort level of a user is improved.
Specifically, the method comprises the following steps: the utility model provides a heat pump air conditioning system, air conditioning system includes compressor, cross valve, interior quick-witted heat exchanger, first outer quick-witted heat exchanger, second outer quick-witted heat exchanger, first throttling arrangement, second throttling arrangement: an outlet H of the compressor is communicated with a first port of the four-way valve through a first pipeline; a second port of the four-way valve is communicated with a port A of the inner machine heat exchanger, a port B of the inner machine heat exchanger is communicated with a port M of the first throttling device, and a first branch and a second branch are connected in parallel between a port N of the first throttling device and a fourth port of the four-way valve; a first external machine heat exchanger is arranged on the first branch, a second throttling device and a second external machine heat exchanger are arranged on the second branch, and the second throttling device is positioned between the interface N and the external machine heat exchanger; a third port of the four-way valve is communicated with an inlet G of the compressor through a third pipeline; the air flow exchanging heat with the first and second external machine heat exchangers firstly flows through the second external machine heat exchanger to exchange heat, and then exchanges heat with the first external machine heat exchanger.
Preferably, the air conditioner further comprises an outer machine fan, and the outer machine fan enables the air flow to exchange heat with the second outer machine heat exchanger firstly and then exchange heat with the first outer machine heat exchanger.
Preferably, the third pipeline is also provided with a gas-liquid separator.
Preferably, the indoor air conditioner further comprises internal electromechanical auxiliary heat for providing auxiliary heat to the indoor space.
Preferably, a second pipeline connected with the first pipeline in parallel is further arranged between the outlet H of the compressor and the first port of the four-way valve, and the second pipeline is further provided with a first valve, a heat storage device and a second valve;
the first valve is arranged between the outlet H of the compressor and the heat storage device, and the second valve is arranged between the heat storage device and the first port of the four-way valve; alternatively, the first valve is provided between the heat storage device and the second valve, and the second valve is provided between the first valve and the first port of the four-way valve.
Preferably, a fourth pipeline is further included;
one end of the fourth pipeline is communicated with the second pipeline, and the connection point is arranged between the heat storage device of the second pipeline and the second valve; or one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the first valve and the second valve of the second pipeline;
and a three-way valve is further arranged between the second external machine heat exchanger and the fourth port on the second branch, the first port of the three-way valve is communicated with the second external machine heat exchanger, the second port of the three-way valve is communicated with the fourth port, and the third port of the three-way valve is communicated with the other end of the fourth pipeline.
Preferably, the device further comprises a fourth pipeline, and a fourth valve is arranged on the fourth pipeline;
one end of the fourth pipeline is communicated with the second pipeline, and the connection point is arranged between the heat storage device of the second pipeline and the second valve; or one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the first valve and the second valve of the second pipeline;
a third valve is further arranged between the second external machine heat exchanger and the fourth port on the second branch; the other end of the fourth pipeline is communicated between the second external machine heat exchanger of the second branch and the third valve.
Preferably, the heat storage device also has an electric heating element.
In addition, the invention also provides a control method of the air conditioning system, which controls the opening or closing of the first valve and the second valve to enable part of exhaust gas of the compressor to pass through the second pipeline or not to pass through the second pipeline, so that heat is provided or not provided for the heat storage device.
The invention also provides a control method of the air conditioning system, which switches the air conditioning system between bypass flow diversion defrosting and non-bypass flow diversion defrosting by controlling the first valve, the second valve and the three-way valve; wherein, when the bypass flow is divided into frost: the first valve is opened and the second valve is closed; the first interface and the third interface of the three-way valve are communicated, and the second interface is disconnected, so that the fourth pipeline is communicated with the second external machine heat exchanger, and the second external machine heat exchanger is disconnected with the fourth interface of the four-way valve; when the defrosting is carried out without bypass flow diversion: the first valve is opened, the second valve is opened, the first interface and the second interface of the three-way valve are communicated, and the third interface is disconnected, so that the fourth pipeline is disconnected with the second external machine heat exchanger, and the second external machine heat exchanger is communicated with the fourth port of the four-way valve.
The invention further provides a control method of the air conditioning system, which is characterized in that the air conditioning system is switched between the bypass flow-dividing defrosting mode and the non-bypass flow-dividing defrosting mode by controlling the first valve, the second valve, the third valve and the fourth valve; wherein, when the bypass flow is divided into frost: the first valve is opened, the second valve is closed, the third valve is opened, and the fourth valve is opened; when the defrosting is carried out without bypass flow diversion: the first valve is open, the second valve is open, the third valve is open, and the fourth valve is closed.
Preferably, when the defrosting is not bypassed: the throttling function of the first throttling device is weakened, and the internal electromechanical auxiliary heat is opened.
Preferably, when the first external machine heat exchanger does not frost and the frost layer is only distributed on the second external machine heat exchanger, the bypass flow diversion defrosting is executed; when the first outer machine heat exchanger and the second outer machine heat exchanger are frosted, the bypass flow diversion defrosting is executed.
Has the advantages that:
according to the invention, by designing the air conditioning system, the heat pump air conditioning system can continuously supply heat to the indoor space during defrosting, so that the indoor comfort is not influenced by defrosting, the indoor environment temperature and the comfort are ensured during defrosting, meanwhile, the defrosting speed of the outdoor unit is accelerated, and the performance of the heat pump is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic view of a heating cycle of a heat pump air conditioning system according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a bypass split defrosting cycle of a heat pump air conditioning system according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a bypass-free defrosting cycle of a heat pump air conditioning system according to a first embodiment of the present invention.
Fig. 4 is a schematic view of a heating cycle of a heat pump air conditioning system according to a second embodiment of the present invention.
Fig. 5 is a schematic view of a bypass split defrosting cycle of a heat pump air conditioning system according to a second embodiment of the present invention.
Fig. 6 is a schematic diagram of a non-bypass split defrosting cycle of a heat pump air conditioning system according to a second embodiment of the present invention.
Wherein: 1-compressor, 2-four-way valve, 3-internal machine heat exchanger, 31-internal machine electric auxiliary heat, 41-first throttling device, 42-second throttling device, 51-first external machine heat exchanger, 52-second external machine heat exchanger, 53-external machine fan, 61-first valve, 62-second valve, 63-third valve, 64-fourth valve, 7-heat storage device, 71-electric heating element, 8-three-way valve and 9-gas-liquid separator.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various structures, these structures should not be limited by these terms. These terms are used to distinguish one structure from another structure. Thus, a first structure discussed below may be termed a second structure without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It is to be understood by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present disclosure and are, therefore, not intended to limit the scope of the present disclosure.
The following detailed description of embodiments of the invention is provided in conjunction with the accompanying figures 1-6:
example one
As shown in fig. 1 to 3, the present invention provides a heat pump air conditioning system, which can ensure that at least one outdoor unit heat exchanger therein does not frost or has little frost. According to the invention, the defrosting pipeline is arranged, so that heat can be continuously supplied to the indoor space during defrosting, the indoor heat is improved, the indoor comfort during defrosting is ensured, meanwhile, the defrosting speed of the outdoor unit is accelerated, and the performance of the heat pump is improved.
As shown in fig. 1 to 3, the heat pump air conditioning system of the present invention includes a compressor 1, a four-way valve 2, an internal heat exchanger 3, a first external heat exchanger 51, a second external heat exchanger 52, a first throttling device 41, and a second throttling device 42: an outlet H of the compressor 1 is communicated with a first port of the four-way valve 2 through a first pipeline; a second port of the four-way valve 2 is communicated with a port A of the inner machine heat exchanger 3, a port B of the inner machine heat exchanger 3 is communicated with a port M of the first throttling device 41, and a first branch and a second branch are connected in parallel between a port N of the first throttling device 41 and a fourth port of the four-way valve 2; a first external machine heat exchanger 51 is arranged on the first branch, a second throttling device 42 and a second external machine heat exchanger 52 are arranged on the second branch, and the second throttling device 42 is positioned between the interface N and the external machine heat exchanger; a third port of the four-way valve 2 is communicated with an inlet G of the compressor 1 through a third pipeline; the air flow exchanging heat with the first and second outdoor heat exchangers 52 passes through the second outdoor heat exchanger 52 for heat exchange, and then exchanges heat with the first outdoor heat exchanger 51. Wherein, the outlet H is an exhaust port H, and the inlet G is an air inlet G; the interface A is an inlet A, and the interface B is an outlet B; interface M is import M, and interface N is export N.
The heat pump air-conditioning system of the invention divides the external machine heat exchanger into two parts, namely a first external machine heat exchanger 51 and a second external machine heat exchanger 52; the second outdoor unit heat exchanger 52 is connected in parallel with the first outdoor unit heat exchanger 51 in the system. The heat pump air-conditioning system is provided with two throttling devices, wherein a first throttling device 41 is arranged between the inner machine heat exchanger 3 and the outer machine heat exchanger; the second throttling device 42 is arranged between the first throttling device 41 and the second external machine heat exchanger 52 and is connected with the second external machine heat exchanger 52 in series. The air conditioner further comprises an outer machine fan 53, and the outer machine fan 53 enables the air flow to firstly exchange heat with the second outer machine heat exchanger 52 and then exchange heat with the first outer machine heat exchanger 51.
And a third pipeline of the heat pump air-conditioning system is also provided with a gas-liquid separator 9. An internal electromechanical auxiliary heat 31 may also be included to assist the internal machine heat exchanger 3 in providing heat.
A second pipeline connected with the first pipeline in parallel is further arranged between the outlet H of the compressor 1 of the heat pump air-conditioning system and the first port of the four-way valve 2, and a first valve 61, a heat storage device 7 and a second valve 62 are further arranged on the second pipeline; the first valve 61 is provided between the outlet H of the compressor 1 and the heat storage device 7, and the second valve 62 is provided between the heat storage device 7 and the first port of the four-way valve 2; alternatively, the first valve 61 is provided between the thermal storage device 7 and the second valve 62, and the second valve 62 is provided between the first valve 61 and the first port of the four-way valve 2 (i.e., alternatively, the first valve 61 in fig. 1 may be provided on the outlet side of the thermal storage device 7).
The heat pump air conditioning system may further comprise a fourth pipeline; one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the heat storage device 7 and the second valve 62 of the second pipeline; alternatively, one end of the fourth line is communicated with the second line, and the connection point is between the first valve 61 and the second valve 62 of the second line; and a three-way valve 8 is further arranged between the second external machine heat exchanger 52 and the fourth port on the second branch, a first interface of the three-way valve 8 is communicated with the second external machine heat exchanger 52, a second interface of the three-way valve 8 is communicated with the fourth port, and a third interface of the three-way valve 8 is communicated with the other end of the fourth pipeline.
The heat storage device 7 of the invention is arranged on a branch pipeline of an exhaust pipeline of the compressor 1; the thermal storage device 7 includes: the heat accumulator is provided with a heat accumulating material and an electric heating member 71.
As shown in fig. 1-3, the heat pump air conditioning system of the present invention comprises a compressor 1, an internal machine heat exchanger 3, two throttling devices, a three-way valve 8, a four-way valve 2, two-way valves, two external machine heat exchangers, and a heat storage device 7, wherein the number of the external machine heat exchangers is at least two, the external machine heat exchangers are respectively a first external machine heat exchanger 51 and a second external machine heat exchanger 52, the first external machine heat exchanger 51 is close to an external machine blade, and the second external machine heat exchanger 52 is located on the windward side; the first throttling device 41 is positioned between the inner machine heat exchanger 3 and the outer machine heat exchanger, the second throttling device 42 is positioned between the first throttling device 41 and the second outer machine heat exchanger 52, and the first throttling device and the second outer machine heat exchanger 52 are connected in series in the system; meanwhile, a pipeline where the second throttling device 42 and the second outdoor unit heat exchanger 52 are located is connected with the first outdoor unit heat exchanger 51 in parallel; one end of the three-way valve 8 is connected with the second external machine heat exchanger 52, the other end is connected with the bypass pipeline, and the third end is connected with the four-way valve 2; first valve 61 and heat accumulation device 7 set up on the branch way at compressor 1 exhaust pipe, parallelly connected with the pipeline at second valve 62 place simultaneously, through the control to the system, make heat pump air conditioning system to lasting heat supply indoor during defrosting, make indoor travelling comfort not receive the influence of defrosting to guarantee indoor ambient temperature and travelling comfort during defrosting, accelerate outdoor unit defrosting speed simultaneously, promote the heat pump performance.
As shown in fig. 1 to 3, the present invention additionally provides a control method of an air conditioning system, which provides or does not provide heat to the heat storage device 7 by controlling the opening or closing of the first valve 61 and the second valve 62 to allow a part of the discharge air of the compressor 1 to pass through the second line or not.
During heating, the refrigerant is divided into two paths after coming out of the compressor 1, wherein one path of high-temperature exhaust gas flows into the heat storage device 7 for heat storage, when the heat is stored sufficiently, the first valve 61 and the second valve 62 are closed, and then the exhaust gas only flows to the indoor heat exchanger (the indoor heat exchanger 3) to provide heat for the indoor space; the refrigerant enters the second outdoor unit heat exchanger 52 after being throttled by the second throttling device 42, and the temperature of the refrigerant entering the second outdoor unit heat exchanger 52 becomes lower due to the throttling function, so that the air can be dehumidified, the air passing through the first outdoor unit heat exchanger 51 is drier, and thus the frost layer is mainly distributed on the second outdoor unit heat exchanger 52, and the first outdoor unit heat exchanger 51 has almost no frost layer.
During defrosting, two defrosting modes are available, and hot gas bypass flow is divided into defrosting modes: the refrigerant is divided into two paths after coming out of the compressor 1, one path of refrigerant continuously supplies heat to the indoor space through the inner machine heat exchanger 3, the other path of refrigerant passes through the heat storage device 7, and meanwhile, the heat storage device 7 releases heat to the refrigerant passing through the heat storage device, so that the temperature of the refrigerant entering the second outer machine heat exchanger 52 is further improved, the defrosting efficiency is improved, the defrosting effect is improved, and the defrosting is more thorough. Defrosting by bypassing hot gas: the refrigerant coming out of the compressor 1 directly defrosts the first and second external heat exchangers 52, so that the defrosting is more efficient and more thorough. And during defrosting, the system controls the stop or rotation of the inner fan and the outer fan according to the frosting condition of the outdoor unit, and meanwhile, the inner fan is electrically and electrically heated, so that continuous heat supply to the indoor is realized while the outdoor unit is efficiently defrosted, and the indoor comfort during defrosting is improved.
The control method of the air conditioning system of the invention, through controlling the first valve 61, the second valve 62 and the three-way valve 8, make the air conditioning system switch over and operate between by-pass shunting defrosting and not by-pass shunting defrosting; wherein, when the bypass flow is divided into frost: the first valve 61 is open and the second valve 62 is closed; the first interface and the third interface of the three-way valve 8 are connected, and the second interface is disconnected, so that the fourth pipeline is communicated with the second outdoor unit heat exchanger 52, and the second outdoor unit heat exchanger 52 is disconnected with the fourth interface of the four-way valve 2; when the defrosting is carried out without bypass flow diversion: the first valve 61 is opened, the second valve 62 is opened, the first port and the second port of the three-way valve 8 are connected, and the third port is disconnected, so that the fourth pipeline is disconnected from the second outdoor heat exchanger 52, and the second outdoor heat exchanger 52 is communicated with the fourth port of the four-way valve 2.
Preferably, when the defrosting is not bypassed: the throttling function of the first throttling device 41 is weakened, and the internal electromechanical auxiliary heat is opened. Preferably, when the first outdoor unit heat exchanger 51 is not frosted and the frost layer is distributed only on the second outdoor unit heat exchanger 52, the bypass flow diversion defrosting is performed; when both the first outdoor unit heat exchanger 51 and the second outdoor unit heat exchanger 52 are frosted, the non-bypass flow diversion defrosting is performed.
Referring to fig. 1 to 3, in the air conditioning system of the present invention, the system cycle of the heat pump air conditioner of the present invention during heating is as shown in fig. 1, and the first valve 61 and the second valve 62 are opened. The refrigerant is divided into two paths after coming out of the compressor 1, one path of high-temperature exhaust gas flows into the heat storage device 7, and the coming-out refrigerant is converged with the other path of refrigerant and flows into the indoor heat exchanger together to supply heat to the indoor space; the refrigerant passes through the inner machine heat exchanger 3 and then enters the first throttling device 41, a part of the throttled low-temperature and low-pressure refrigerant enters the first outer machine heat exchanger 51 to exchange heat with outside air, the other part of the refrigerant passes through the second throttling device 42, the refrigerant passes through the second throttling device and then enters the second outer machine heat exchanger 52 to exchange heat with the outside air, the refrigerant coming out of the first outer machine heat exchanger 51 and the second outer machine heat exchanger 52 is converged and then returns to the suction port of the compressor 1 through the four-way valve 2, and a heating cycle of the refrigerant is completed. The refrigerant entering the second external machine heat exchanger 52 is throttled twice by the first throttling device 41 and the second throttling device 42, so that the temperature of the refrigerant entering the second external machine heat exchanger 52 is lower, the air can be dehumidified, the temperature of the refrigerant entering the second external machine heat exchanger 52 is low, the temperature of a pipeline flowing through is lower, when the air flows through the surface of the pipeline, the air with certain humidity mainly frosts on the second external machine heat exchanger 52, and the moisture content of the air entering the inner side heat exchanger is greatly reduced; the reason for drying the air passing through the first outdoor unit heat exchanger 51 to cause the outdoor heat exchanger to frost is mainly the moisture content of the air, and thus the moisture content of the air in contact with the heat exchanger is reduced; since the wet air having a certain moisture content is condensed into frost after the air passes through the second outdoor unit heat exchanger 52, the air passing through the first outdoor unit heat exchanger 51 is drier, that is, the moisture content of the air is reduced, which can greatly reduce the frosting rate thereof), such a frost layer is mainly distributed on the second outdoor unit heat exchanger 52, while the first outdoor unit heat exchanger 51 has almost no frost layer (when the moisture content of the air is reduced, the frosting amount is reduced; when the heat storage device 7 has sufficient heat storage, the first valves 61 and 2 are closed, and the exhaust gas of the compressor 1 only flows to the indoor heat exchanger to supply heat to the indoor.
During defrosting, the invention is divided into two defrosting modes according to the frosting condition of the first and second external heat exchangers 52, namely hot gas bypass flow-dividing defrosting and hot gas non-bypass flow-dividing defrosting respectively, and the implementation and operation of the two defrosting modes can be judged by the pipe temperature of the outdoor heat exchanger.
Hot gas bypass flow diversion defrosting: when the first external machine heat exchanger 51 does not frost and the frost layer is only distributed on the second external machine heat exchanger 52, the system operates the hot gas bypass flow diversion defrosting mode, the first valve 61 is opened, the second valve 62 is closed, and the system circulates during defrosting as shown in fig. 2. During defrosting, the compressor 1 continuously operates, the four-way valve 2 does not change direction, the refrigerant is divided into two paths after coming out of the compressor 1, one path of refrigerant passes through the inner machine heat exchanger 3, the first throttling device 41 and the first outer machine heat exchanger 51 and finally returns to the compressor 1, and one refrigerant cycle for supplying heat to the indoor space is completed; the other path passes through the first valve 61, the heat storage device 7, the three-way valve 8, the second external machine heat exchanger 52, the second throttling device 42 and the first external machine heat exchanger 51, and the first throttling device 41 does not need to be closed or a control valve does not need to be added, because the pressure of the refrigerant coming out of the second throttling device 42 is relatively low, the refrigerant cannot flow to the first throttling device 41 and finally returns to the compressor 1, and one refrigerant cycle of defrosting is completed. Meanwhile, during defrosting, one path of refrigerant from the compressor 1 passes through the inner machine heat exchanger 3 to continuously supply heat to the indoor, and meanwhile, the inner machine is started to supply auxiliary heat, so that the indoor heat supply amount is increased; after the other path of the refrigerant passes through the heat storage device 7, the heat storage device 7 releases heat to the refrigerant passing through the heat storage device, so that the temperature of the refrigerant before entering the outdoor heat exchanger is further improved, and the defrosting efficiency is improved; according to outer machine condition of frosting during the defrosting, the rotation of inside and outside fan of system control or stop, continuous heat supply indoor when realizing the high-efficient defrosting of outer machine promotes indoor travelling comfort during the defrosting.
Defrosting by bypassing hot gas: when the first external machine heat exchanger 51 and the second external machine heat exchanger 52 are frosted, the hot gas of the operation of the system does not bypass the shunting defrosting mode, and the circulation diagram of the defrosting system is shown in fig. 3. During defrosting, the compressor 1 continuously operates, the four-way valve 2 is not reversed, after the refrigerant comes out of an exhaust port of the compressor 1, the refrigerant continuously supplies heat to the indoor space through the inner machine heat exchanger 3, and meanwhile, the inner machine is started to supply electric auxiliary heat so as to improve the indoor heat supply amount; the refrigerant enters the first throttling device 41 after passing through the inner machine heat exchanger 3, at the moment, the throttling function of the throttling device is weakened, the refrigerant is divided into two parts after coming out from the first throttling device 41, one part of the refrigerant directly enters the first outer machine heat exchanger 51 for defrosting, the other part of the refrigerant passes through the second throttling device 42 and enters the second outer machine heat exchanger 52 for defrosting, the refrigerant coming out from the first outer machine heat exchanger 51 and the second outer machine heat exchanger 52 is converged and then returns to the suction port of the compressor 1 through the four-way valve 2, and one cycle of the refrigerant is completed. While during defrosting a part of the compressor 1 discharge air is passing through the heat storage 7 to store heat, when the heat storage is sufficient, the first valves 61, 2 are closed. According to outer machine condition of frosting during the defrosting, the rotation of inside and outside fan of system control or stop, continuous heat supply indoor when realizing the high-efficient defrosting of outer machine promotes indoor travelling comfort during the defrosting.
Example two
As shown in fig. 4-6, the three-way valve 8 of the first embodiment of the present invention is replaced by two-way valves, and the system cycle is as shown in fig. 4, 5 and 6.
The second embodiment differs from the first embodiment in the structure in that a fourth valve 64 is provided in the fourth line; one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the heat storage device 7 and the second valve 62 of the second pipeline; alternatively, one end of the fourth line is communicated with the second line, and the connection point is between the first valve 61 and the second valve 62 of the second line; a third valve 63 is further arranged on the second branch between the second external machine heat exchanger 52 and the fourth port; the other end of the fourth line communicates between the second outdoor heat exchanger 52 of the second branch and the third valve 63.
As shown in fig. 4, a control method of an air conditioning system according to a second embodiment is illustrated, in which a flow manner of a working medium during a heating cycle is illustrated, which is the same as the flow manner of fig. 1 according to the first embodiment.
As shown in fig. 5 and 6, illustrating a control method of an air conditioning system according to a second embodiment of the present invention, the air conditioning system is switched between the bypass-diversion-defrosting mode and the non-bypass-diversion-defrosting mode by controlling a first valve 61, a second valve 62, a third valve 63 and a fourth valve 64; wherein, when the bypass flow is divided into frost: the first valve 61 is open, the second valve 62 is closed, the third valve 63 is open, and the fourth valve 64 is open; when the defrosting is carried out without bypass flow diversion: the first valve 61 is open, the second valve 62 is open, the third valve 63 is open, and the fourth valve 64 is closed. Wherein, fig. 5 and 6 show the flow direction of working media (refrigerants) in two defrosting modes, and the circulation mode is the same as that in the first embodiment (fig. 2 and 3).
The forms of the first throttling device 41 and the second throttling device 42 are not limited in the invention, and can be capillary throttling, short throttling pipe throttling, electronic expansion valve throttling and the like, and meanwhile, the first throttling device 42 and the second throttling device 42 can be combined by using different throttling devices or can also use the same throttling device. The form of the external machine heat exchanger is not limited, and the external machine heat exchanger can be a tube-fin heat exchanger, a microchannel heat exchanger and the like, and is specifically selected according to the use condition. The form of the electric heating member 71 in the heat storage device 7 of the present invention is not limited, and may be an electric heating tube or an electric heating rod. The first, second, third, and fourth valves 64 of the present invention may be two-way valves; the indoor heat exchanger 3 of the invention can be an indoor heat exchanger, and the outdoor heat exchanger can be an outdoor heat exchanger.
Has the advantages that:
in the heat pump air-conditioning system and the control method thereof, the heat exchange loop is provided with the first outdoor unit heat exchanger 52 and the second outdoor unit heat exchanger 52 in parallel, and the second throttling device 42 is additionally arranged in front of the second outdoor unit heat exchanger 52, so that the temperature of a working medium flowing through the second outdoor unit heat exchanger 52 is lower than that of a working medium flowing through the first outdoor unit heat exchanger 51 during heating; and the air flow which is subjected to heat exchange by the first and second external machine heat exchangers 52 firstly flows through the second external machine heat exchanger 52 for heat exchange, and then is subjected to heat exchange with the first external machine heat exchanger 51. After the air flow passes through the second outdoor unit heat exchanger 52, the humidity of the air flow is obviously reduced, so that the frost formation of the first outdoor unit heat exchanger 51 can be reduced, and the heating effect can be ensured to a certain extent. According to the invention, preferably, the defrosting pipeline is arranged at the outlet of the compressor 1, so that the conversion between bypass defrosting and non-bypass defrosting can be realized, the heat pump air conditioning system continuously supplies heat during defrosting, and the comfort level of a user is improved.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (13)
1. The utility model provides a heat pump air conditioning system, air conditioning system includes compressor (1), cross valve (2), interior quick-witted heat exchanger (3), first outer quick-witted heat exchanger (51), second outer quick-witted heat exchanger (52), first throttling arrangement (41), second throttling arrangement (42), its characterized in that:
an outlet H of the compressor (1) is communicated with a first port of the four-way valve (2) through a first pipeline;
a second port of the four-way valve (2) is communicated with a port A of the inner machine heat exchanger (3), a port B of the inner machine heat exchanger (3) is communicated with a port M of the first throttling device (41), and a first branch and a second branch are connected in parallel between a port N of the first throttling device (41) and a fourth port of the four-way valve (2); a first external machine heat exchanger (51) is arranged on the first branch, a second throttling device (42) and a second external machine heat exchanger (52) are arranged on the second branch, and the second throttling device (42) is positioned between the interface N and the external machine heat exchanger;
a third port of the four-way valve (2) is communicated with an inlet G of the compressor (1) through a third pipeline;
the air flow exchanging heat with the first and second external machine heat exchangers (52) firstly flows through the second external machine heat exchanger (52) to exchange heat, and then exchanges heat with the first external machine heat exchanger (51).
2. The air conditioning system of claim 1, wherein: the heat exchanger further comprises an outer machine fan (53), and the outer machine fan (53) enables the airflow to firstly exchange heat with the second outer machine heat exchanger (52) and then exchange heat with the first outer machine heat exchanger (51).
3. The air conditioning system of claim 1, wherein: a gas-liquid separator (9) is also arranged on the third pipeline.
4. The air conditioning system of claim 1, wherein: also included is an internal electromechanical auxiliary heat (31) for providing auxiliary heat to the room.
5. The air conditioning system according to any one of claims 1 to 4, wherein: a second pipeline connected with the first pipeline in parallel is further arranged between the outlet H of the compressor (1) and the first port of the four-way valve (2), and a first valve (61), a heat storage device (7) and a second valve (62) are further arranged on the second pipeline;
a first valve (61) is provided between the outlet H of the compressor (1) and the heat storage device (7), and a second valve (62) is provided between the heat storage device (7) and the first port of the four-way valve (2); alternatively, the first valve (61) is provided between the heat storage device (7) and the second valve (62), and the second valve (62) is provided between the first valve (61) and the first port of the four-way valve (2).
6. The air conditioning system of claim 5, wherein: the device also comprises a fourth pipeline;
one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the heat storage device (7) and the second valve (62) of the second pipeline; or one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the first valve (61) and the second valve (62) of the second pipeline;
and a three-way valve (8) is further arranged between the second external machine heat exchanger (52) and the fourth port on the second branch, a first interface of the three-way valve (8) is communicated with the second external machine heat exchanger (52), a second interface of the three-way valve (8) is communicated with the fourth port, and a third interface of the three-way valve (8) is communicated with the other end of the fourth pipeline.
7. The air conditioning system of claim 5, wherein: the device also comprises a fourth pipeline, and a fourth valve (64) is arranged on the fourth pipeline;
one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the heat storage device (7) and the second valve (62) of the second pipeline; or one end of the fourth pipeline is communicated with the second pipeline, and the connection point is between the first valve (61) and the second valve (62) of the second pipeline;
a third valve (63) is further arranged between the second external machine heat exchanger (52) and the fourth port on the second branch; the other end of the fourth pipeline is communicated between a second external heat exchanger (52) of the second branch and a third valve (63).
8. The air conditioning system of claim 5, wherein: the heat storage device (7) also has an electric heating element (71).
9. A control method of an air conditioning system according to any one of claims 5 to 8, characterized in that: and part of exhaust gas of the compressor (1) passes through the second pipeline or does not pass through the second pipeline by controlling the opening or closing of the first valve (61) and the second valve (62), so that heat is provided or not provided for the heat storage device (7).
10. A control method of an air conditioning system according to claim 6, characterized in that: the air conditioning system is switched to operate between bypass flow diversion defrosting and non-bypass flow diversion defrosting by controlling a first valve (61), a second valve (62) and a three-way valve (8);
wherein, when the bypass flow is divided into frost: the first valve (61) is open and the second valve (62) is closed;
the first interface and the third interface of the three-way valve (8) are communicated, and the second interface is disconnected, so that the fourth pipeline is communicated with the second outdoor machine heat exchanger (52), and the second outdoor machine heat exchanger (52) is disconnected with the fourth port of the four-way valve (2);
when the defrosting is carried out without bypass flow diversion: the first valve (61) is opened and the second valve (62) is opened;
the first interface and the second interface of the three-way valve (8) are communicated, the third interface is disconnected, so that the fourth pipeline and the second outdoor machine heat exchanger (52) are disconnected, and the second outdoor machine heat exchanger (52) is communicated with the fourth port of the four-way valve (2).
11. A control method of an air conditioning system according to claim 7, characterized in that: switching operation of the air conditioning system between bypass-diversion defrost and non-bypass-diversion defrost by controlling the first valve (61), the second valve (62), the third valve (63) and the fourth valve (64);
wherein, when the bypass flow is divided into frost: the first valve (61) is opened, the second valve (62) is closed, the third valve (63) is opened, and the fourth valve (64) is opened;
when the defrosting is carried out without bypass flow diversion: the first valve (61) is open, the second valve (62) is open, the third valve (63) is open, and the fourth valve (64) is closed.
12. The control method according to any one of claims 10 and 11, characterized in that: when the defrosting is carried out without bypass flow diversion: the throttling action of the first throttling device (41) is weakened, the internal electromechanical auxiliary heat (31) is opened, and auxiliary heat is provided for the indoor space.
13. The control method according to any one of claims 10 and 11, characterized in that: when the first external machine heat exchanger (51) does not frost and the frost layer is only distributed on the second external machine heat exchanger (52), the bypass flow diversion defrosting is executed; when the first external machine heat exchanger (51) and the second external machine heat exchanger (52) are frosted, the defrosting without bypass flow division is carried out.
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Effective date of registration: 20210318 Address after: No.789, Jinji Road, Qianshan, Xiangzhou District, Zhuhai City, Guangdong Province Applicant after: GREE GREEN REFRIGERATION TECHNOLOGY CENTER Co.,Ltd. OF ZHUHAI Address before: 519070 golden hill west road, Qianshan, Xiangzhou District, Zhuhai, Guangdong Applicant before: GREE ELECTRIC APPLIANCES,Inc.OF ZHUHAI |
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