CN115342482A - Defrosting control method and air conditioner - Google Patents
Defrosting control method and air conditioner Download PDFInfo
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- CN115342482A CN115342482A CN202211010619.1A CN202211010619A CN115342482A CN 115342482 A CN115342482 A CN 115342482A CN 202211010619 A CN202211010619 A CN 202211010619A CN 115342482 A CN115342482 A CN 115342482A
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- 238000010257 thawing Methods 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005338 heat storage Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 12
- 239000011232 storage material Substances 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000004378 air conditioning Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 30
- 230000005494 condensation Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a defrosting control method and an air conditioner, comprising the following steps of: when the heating operation time reaches the accumulated operation time t0, allowing to enter a defrosting mode; according to the defrost temperature T def And the ambient temperature T Ring(s) Identifying a frosting degree; when the frosting degree is first grade, hot gas bypass defrosting is adopted; when the frosting degree is second grade, heat storage defrosting is adopted; when the frosting degree is three-level, the reverse defrosting is adopted. By arranging the hot gas bypass branch and the defrosting branch, when the frosting degree is not serious, defrosting is carried out by utilizing hot gas bypass and compressor heat, defrosting is not reversed, the air conditioner can continuously heat, the using comfort is improved to the maximum extent on the premise of meeting the defrosting requirement, and energy waste is reduced; and meanwhile, a plurality of defrosting modes are set, so that the operation reliability of the air-conditioning system is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and an air conditioner.
Background
When the air conditioner operates and heats in winter, because of low evaporation temperature, when the temperature is lower than dew point temperature and lower than 0 ℃, the outdoor heat exchanger can frost after long-time operation, the efficiency of the heat exchanger is influenced, and therefore defrosting is needed in time when frosting is detected. When the existing air conditioner is in defrosting operation, the four-way valve is reversed, and a high-temperature and high-pressure refrigerant of the outdoor unit enters the outdoor unit to release heat and defrost, and then is throttled to evaporate and absorb heat in the indoor unit; the minimum temperature of an indoor fan pipe during defrosting can reach-30 ℃, and in order to avoid cold air from blowing people and ensure comfort, the indoor fan is in a closed state during defrosting. Therefore, the fluctuation of rooms is large in the defrosting process, and the comfort of the air conditioner in winter is greatly influenced.
The prior art discloses an air conditioner defrosting control method, which comprises the following steps: when the defrosting condition is met, a non-stop defrosting mode is switched in and operated, and the operation of the non-stop defrosting mode comprises the following steps: the refrigerant main loop continues to run a heating cycle, and the defrosting bypass branch is utilized to introduce defrosting refrigerant from the refrigerant main loop to enter the outdoor heat exchanger so as to defrost the outdoor heat exchanger; acquiring operation parameters under the operation of the non-stop defrosting mode; judging whether the operation of the non-stop defrosting mode is abnormal or not according to the operation parameters; when judging that the abnormity occurs, switching the defrosting of the air conditioner into a reverse defrosting mode, wherein the reverse defrosting mode comprises the following operation steps: the refrigerant main loop runs the refrigeration cycle, and the defrosting bypass branch is not utilized. Although the reliability of the operation of the air conditioner can be guaranteed to a certain extent in the prior art, the defrosting of the mode can not be carried out according to the frosting degree, the same defrosting mode is adopted when the frosting is thick and a small amount of frosting is carried out, and the use comfort of a user is easily influenced.
Disclosure of Invention
In view of this, the present invention aims to provide a defrosting control method and an air conditioner, so as to solve the problems that the fluctuation of indoor rooms is large and the use comfort of users is affected due to defrosting in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a defrost control method comprising the steps of:
when the heating operation time reaches the accumulated operation time t0, allowing to enter a defrosting mode;
according to the defrost temperature T def And ambient temperature T Ring(s) Identifying a frosting degree;
when the frosting degree is the first grade, hot gas bypass defrosting is adopted; when the frosting degree is in the second level, heat storage defrosting is adopted; when the frosting degree is three-level, the reverse defrosting is adopted. When the frosting degree is not serious, defrosting is carried out by utilizing the hot gas bypass and the heat of the compressor (waste heat), the defrosting is not reversed, the air conditioner can continuously heat, the use comfort is improved to the maximum extent on the premise of meeting the defrosting requirement, and the energy waste is reduced; and meanwhile, multiple defrosting modes are set, so that the operation reliability of the air-conditioning system is ensured.
Further, at T def < 0, and T Ring (C) -b＜T def ≤T Ring (C) When a, hot gas bypass defrosting is adopted;
at T def < 0, and T Ring (C) -c＜T def ≤T Ring (C) When the air is subjected to the defrosting, heat accumulation defrosting is adopted;
at T def < 0, and T def ＜T Ring (C) And when the temperature is-c, reversing defrosting is adopted.
Further, the hot gas bypass defrosting comprises the following steps: and adjusting the opening k of the main electronic expansion valve outside the small chamber, and opening the hot gas bypass electromagnetic valve. The high-pressure refrigerant passing through the hot gas bypass branch after being exhausted by the compressor is converged with the refrigerant throttled by the main electronic expansion valve of the outdoor unit, so that the low-pressure and the refrigerant evaporation temperature are improved.
Further, the opening k of the outdoor main electronic expansion valve is 20% to 40% of the maximum opening.
Further, according to the actual superheat SH of the outdoor heat exchanger In fact Controlling the opening degree of the outdoor main electronic expansion valve by delta P to control SH In fact ＞SH Target So as to ensure that the liquid does not return to the compressor, namely, the refrigerant flowing through the outdoor heat exchanger is completely evaporated; at the actual degree of superheat SH Practice of ＜SH Target According to SH Practice of And SH Target And adjusting the opening of the outdoor main electronic expansion valve by a small quantity delta P.
And further, controlling the inlet temperature of the outdoor heat exchanger to be higher than e ℃, and when the inlet temperature of the outdoor heat exchanger is lower than e, adjusting the opening of the outdoor main electronic expansion valve by a small quantity delta P according to the inlet temperature of the outdoor heat exchanger. The flow of the outdoor main electronic expansion valve is reduced, the flow of the hot gas bypass branch is improved, and defrosting is facilitated.
Further, the heat storage defrosting comprises the following steps:
operating the fan gear of the indoor unit to be adjusted to the lowest gear, and simultaneously opening the electronic expansion valve of the indoor unit to the maximum opening; the heat exchange quantity of the indoor unit is reduced; meanwhile, the opening of the outdoor main electronic expansion valve is opened to the maximum opening, and the defrosting electromagnetic valve is closed; and then the defrosting electronic expansion valve of the outdoor unit is opened. The indoor unit and the outdoor unit are both positioned on a condensation side, the condensation and heat dissipation of the indoor unit are used for heating the indoor unit, and the condensation side of the outdoor unit is used for defrosting; after being throttled by an outdoor unit defrosting electronic expansion valve, the condensed liquid refrigerant passes through a coil pipe coiled around the compressor to absorb the heat of a heat storage material of the compressor and is evaporated into a gaseous refrigerant, so that the refrigerant circulation is realized; during the defrosting, the four-way valve is not reversed, and the indoor unit can continuously heat.
Further, the reversing defrosting comprises the following steps: the four-way valve is reversed, and the high-temperature and high-pressure gaseous refrigerant discharged by the compressor passes through the four-way valve and then firstly passes through the outdoor heat exchanger to release heat so as to defrost the outdoor heat exchanger; meanwhile, the defrosting electronic expansion valve of the outdoor unit is opened, and the condensed liquid refrigerant absorbs heat through the heat storage material and the indoor unit.
Further, the process of correcting the present defrosting entry mode includes: at the actual defrosting time t (n-1) And when the standard time t is less than the standard time t, the defrosting mode selection is decreased progressively. When the last defrosting time is long, the frost formation is thick, so that the defrosting needs to be carried out for a longer time. The judgment of the current frosting thickness has certain error and needs to be corrected, and the operation is changed into the operation according to the heat storage defrosting mode according to the temperature and the need of defrosting according to the hot gas bypass; and defrosting according to the temperature requirement and heat storage is carried out according to the reversing defrosting.
Compared with the prior art, the defrosting control method has the following advantages:
1) When the frosting degree is not serious, the defrosting is carried out by utilizing the hot gas bypass and the heat of the compressor (waste heat), the defrosting is not reversed, the air conditioner can continuously heat, the use comfort is improved to the maximum extent, and the energy waste is reduced; meanwhile, a plurality of defrosting modes are set, so that the operation reliability of the air-conditioning system is ensured;
2) The defrosting mode is adaptively corrected according to actual conditions, frequent defrosting is avoided, reversing defrosting is further reduced, and the comfort level is improved.
The invention also provides an air conditioner, which comprises a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, an outdoor main electronic expansion valve and a hot gas bypass branch, wherein one end of the hot gas bypass branch is connected to a compressor exhaust pipe, the other end of the hot gas bypass branch is connected between the outdoor heat exchanger and the outdoor main electronic expansion valve, a defrosting branch is also arranged between the outdoor heat exchanger and the compressor, an outdoor defrosting electronic expansion valve is arranged on the defrosting branch and used for controlling the flow of a refrigerant on the defrosting branch, a coil pipe and a heat storage material wrapping the compressor are arranged on the periphery of the compressor, the refrigerant flowing through the coil pipe can absorb the heat of the heat storage material, and the air conditioner can execute the defrosting control method.
Compared with the prior art, the air conditioner and the defrosting control method have the same advantages, and the detailed description is omitted.
Drawings
Fig. 1 is a schematic view illustrating a flow direction of a refrigerant in a heating mode according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a refrigerant flow direction in the reverse defrosting mode according to an embodiment of the present invention.
Description of reference numerals:
1-compressor, 2-four-way valve, 3-outdoor heat exchanger, 4-gas-liquid separator, 5-oil separator, 6-high pressure sensor, 7-low pressure sensor, 8-hot gas bypass branch, 9-hot gas bypass solenoid valve, 10-defrosting solenoid valve, 11-outdoor unit defrosting electronic expansion valve, 12-outdoor main electronic expansion valve, 13-ambient temperature bulb, 14-defrosting bulb, 15-outdoor fan, 16-defrosting branch and 101-heat storage material
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment provides a defrosting control method, which comprises the following steps:
s100, identifying frosting degree according to defrosting temperature and environment temperature
Specifically, in order to avoid the influence of frequent defrosting on the use comfort of a user, on the premise of ensuring reliability, the accumulated operation time t0 is set, and when the heating operation time of the air conditioner reaches the accumulated operation time t0, the air conditioner is allowed to enter a defrosting mode.
After the accumulated running time is met, the defrosting temperature T is determined def And ambient temperature T Ring (C) The step of judging the frosting degree by the difference value comprises the following steps:
S101. at T def < 0, and T Ring (C) -b＜T def ≤T Ring(s) A, the frosting degree is first grade, namely the frosting amount is thinner;
s102, at T def < 0, and T Ring (C) -c＜T def ≤T Ring (C) When the frost formation amount is-b, the frost formation degree is two-grade, namely the frost formation amount is moderate;
s103, at T def < 0, and T def ＜T Ring(s) And c indicates that the frosting degree is three levels, namely the frosting amount is thicker.
Wherein a, b and c are constants, and can be stored in a storage system of the air conditioner before the air conditioner leaves a factory. Or may be set according to the use environment. A is more than b and less than c, the value range of a is 3-7, and the preferred value is 5; b ranges from 7 to 12, and the preferred value is 9; c ranges from 12 to 15, preferably 13; d ranges from 5 to 15, preferably 8. The value range of the priority value is determined according to parameter selection, sensor installation position and the like during product development, the values of different scenes are different, so the range is selected, and the optimal value is set to be the maximum acceptable bearing capacity under the conditions of not influencing comfort, reliability and the like.
And S200, selecting different defrosting modes according to the frosting degree.
S201, when frost is thin, hot gas bypass defrosting is adopted. The hot gas bypass defrosting comprises the following steps: and adjusting the opening k of the main electronic expansion valve outside the chamber, opening the hot gas bypass electromagnetic valve, and converging the high-pressure refrigerant passing through the hot gas bypass branch after the compressor exhausts the air and the refrigerant throttled by the main electronic expansion valve outside the chamber. Adjusting the opening k of a main electronic expansion valve outside the chamber to reduce the refrigerant circulation amount of a main flow path, and simultaneously opening a hot gas bypass electromagnetic valve; the low-pressure and the refrigerant evaporation temperature are improved by converging the refrigerant throttled by the compressor exhaust and the outdoor main electronic expansion valve, and when the inlet temperature of the evaporator is higher than 0 ℃, a frost layer begins to melt, so that the defrosting effect of the heat exchanger is realized. Meanwhile, as the four-way valve is not reversed, the indoor unit can continuously heat without influencing the comfort level of indoor users.
Further, the opening k of the outdoor main electronic expansion valve is 20% to 40%, preferably 30%, of the maximum opening.
Further, according to the actual superheat SH of the outdoor heat exchanger In fact The adjustment quantity delta P of the opening of the outdoor main electronic expansion valve and the actual superheat SH of the outdoor heat exchanger are controlled In fact = outdoor heat exchanger outlet temperature-outdoor heat exchanger inlet temperature.
Specifically, SH is controlled In fact ＞SH Target So as to ensure that the liquid does not return to the compressor, namely, the refrigerant flowing through the outdoor heat exchanger is completely evaporated. At the actual degree of superheat SH In fact ＜SH Target According to SH Practice of And SH Target And adjusting the opening of the outdoor main electronic expansion valve by a small quantity delta P. Preferably, SH Target The preset value is stored in a storage system of the air conditioner before the air conditioner leaves a factory.
And controlling the inlet temperature of the outdoor heat exchanger to be more than e ℃ (e is more than 0). When the inlet temperature of the outdoor heat exchanger is less than e, the opening of the outdoor main electronic expansion valve is adjusted by a small quantity delta P according to the inlet temperature of the outdoor heat exchanger, so that the flow of the outdoor main electronic expansion valve is reduced, the flow of a hot gas bypass branch is improved, and defrosting is facilitated. Preferably, e is a preset value, and is stored in a storage system of the air conditioner before the air conditioner leaves a factory.
Further, when the defrosting temperature T is detected def And d, indicating that the defrosting is finished, restoring the outdoor main electronic expansion valve to be normally controlled, closing the hot gas bypass electromagnetic valve, and withdrawing the defrosting of the whole machine.
And S202, when the frosting is moderate, heat storage defrosting is adopted. The heat storage defrosting method comprises the following steps:
operating the fan gear of the indoor unit, adjusting to the lowest gear, and simultaneously opening the electronic expansion valve of the indoor unit to the maximum opening; the heat exchange quantity of the indoor unit is reduced; meanwhile, the opening of the outdoor unit main electronic expansion valve is opened to the maximum opening, and the defrosting electromagnetic valve is closed; and then the defrosting electronic expansion valve of the outdoor unit is opened. The indoor unit and the outdoor unit are both positioned on a condensation side, the condensation and heat dissipation of the indoor unit are used for heating the indoor unit, and the condensation side of the outdoor unit is used for defrosting; after being throttled by an outdoor unit defrosting electronic expansion valve, the condensed liquid refrigerant passes through a coil pipe coiled around the compressor to absorb the heat of a heat storage material of the compressor and is evaporated into a gaseous refrigerant, so that the refrigerant circulation is realized; during the defrosting period, the four-way valve does not change direction, and the indoor unit can continuously heat.
During this period, when the defrosting temperature T is detected def And d, when the defrosting is finished, the outdoor main electronic expansion valve is restored to normal control, the defrosting electromagnetic valve is opened, the defrosting electronic expansion valve is closed, the whole machine is defrosted, and the electronic expansion valve of the indoor machine and the fan gear are restored to normal control.
And S203, when the frost is thick, hot gas bypass defrosting and heat storage defrosting cannot meet the defrosting requirement, and reversing defrosting is needed at the moment. Specifically, the reversing defrosting comprises the following steps: the four-way valve is used for reversing, and high-temperature and high-pressure gaseous refrigerant discharged by the compressor passes through the four-way valve and then flows through the outdoor heat exchanger to release heat so as to defrost the outdoor heat exchanger; meanwhile, the defrosting electronic expansion valve of the outdoor unit is opened, and the condensed liquid refrigerant absorbs heat through the heat storage and the indoor unit. Quickening the defrosting effect, and defrosting is often carried out in short time.
And S300, correcting the defrosting entering mode according to the time consumed by the last defrosting.
Specifically, the defrosting entry mode is corrected according to the analysis of the time consumed by the last defrosting, and when the last defrosting time is long, the frosting is thicker, so that the defrosting needs to be carried out for a longer time. And also shows that certain error exists in the judgment of the current frost formation thickness and needs to be corrected. Further, the correction method comprises the following steps:
s301, frosting degree and ambient temperature T Ring (C) High pressure Pd, evaporator surface temperature T def Based on the correlation, the defrosting standard time T = f (T) is established by combining the influence shadows when the whole machine is delivered from the factory Ring (C) 、Pd、T def )。
In actual operation, the actual time of last defrosting is detected and compared with the standard time t,
when the last actual defrosting time t (n-1) If t, the defrost mode selection is incremented, for example: defrosting according to the temperature requirement by hot gas bypass, and then operating according to a heat storage defrosting mode; and defrosting according to the temperature requirement and heat storage is carried out according to the reversing defrosting.
When actual defrosting time t (n-1) If t is less than t, the defrosting mode is selectedAlternative decreasing, example: defrosting according to the temperature requirement and reversing, and then, performing heat storage defrosting; and defrosting according to the temperature requirement and heat exchange is converted into hot gas bypass defrosting.
The standard time t ranges from 5 min to 10min, and the optimal value is 8min.
As part of the embodiment of the present invention, an air conditioner is further provided, which includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an indoor heat exchanger (not shown in the figure) and an outdoor main electronic expansion valve 12, wherein an ambient temperature bulb 13 is disposed on an air inlet side of the outdoor heat exchanger 3, and is used for detecting and obtaining an ambient temperature. The outdoor heat exchanger 3 is also provided with a defrosting thermal bulb 14 for detecting and acquiring defrosting temperature. Preferably, the ambient temperature bulb 13 is disposed near the outdoor fan 15.
A hot gas bypass branch 8 is also arranged, one end of the hot gas bypass branch 8 is connected to the exhaust pipe of the compressor, and the other end is connected between the outdoor heat exchanger 3 and the outdoor main electronic expansion valve 12. A coil and a heat storage material 101 wrapping the compressor are provided around the compressor 1, and a refrigerant flowing through the coil can absorb heat of the heat storage material 101.
Further, a hot gas bypass electromagnetic valve 9 is further arranged on the hot gas bypass branch 8, and the hot gas bypass electromagnetic valve 9 is used for controlling the on-off of the hot gas bypass branch 8. A defrost solenoid valve 10 is further provided between the outdoor heat exchanger 3 and the four-way valve 2. A defrosting branch 16 is further disposed between the outdoor heat exchanger 3 and the compressor, and an outdoor defrosting electronic expansion valve 11 is disposed on the defrosting branch 16 and is used for controlling the flow rate of the refrigerant on the defrosting branch 16.
The air conditioner described in this embodiment further includes an oil separator 5 and a gas-liquid separator 4, the oil separator 5 is disposed on an exhaust pipe of the compressor and is used for separating oil phases such as lubricating oil in the refrigerant, and the gas-liquid separator 4 is disposed on a return pipe of the compressor and is used for performing gas-liquid separation on the refrigerant in the return pipe to avoid liquid impact on the compressor. The exhaust pipe of the compressor is also provided with a high pressure sensor 6 for detecting the high pressure of the refrigerant, and the muffler of the compressor is also provided with a low pressure sensor 7 for detecting the low pressure.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A defrost control method, comprising the steps of:
when the heating operation time reaches the accumulated operation time t0, allowing to enter a defrosting mode;
according to the defrost temperature T def And ambient temperature T Ring (C) Identifying a frosting degree;
when the frosting degree is first grade, hot gas bypass defrosting is needed; when the frosting degree is in the second grade, heat storage defrosting is needed; when the frosting degree is three-level, reversing defrosting is needed;
and correcting the defrosting entering mode according to the time consumed by the last defrosting.
2. The defrost control method of claim 1,
at T def < 0, and T Ring(s) -b＜T def ≤T Ring (C) When the air is heated, the air is heated to be discharged;
at T def < 0, and T Ring(s) -c＜T def ≤T Ring (C) When the air is subjected to the defrosting, heat accumulation defrosting is adopted;
at T def < 0, and T def ＜T Ring(s) And when the temperature is-c, reversing defrosting is adopted.
3. The defrost control method of claim 1, wherein said hot gas bypass defrost comprises the steps of: and adjusting the opening k of the main electronic expansion valve outside the small chamber, and opening the hot gas bypass electromagnetic valve.
4. The defrost control method of claim 3, wherein the outdoor main electronic expansion valve opening k is 20% to 40% of a maximum opening.
5. Defrost control method according to claim 3, characterized in that the actual superheat SH of the outdoor heat exchanger is used as a function of Practice of Controlling the opening degree of the outdoor main electronic expansion valve by delta P to control SH In fact ＞SH Target (ii) a At the actual degree of superheat SH Practice of ＜SH Target According to SH Practice of And SH Target And adjusting the opening of the outdoor main electronic expansion valve by a small quantity delta P.
6. The defrosting control method according to claim 3, wherein the inlet temperature of the outdoor heat exchanger is controlled to be higher than e ℃, and when the inlet temperature of the outdoor heat exchanger is lower than e, the opening of the outdoor main electronic expansion valve is adjusted by a small amount Δ P according to the inlet temperature of the outdoor heat exchanger.
7. The defrost control method of claim 1, wherein the heat storage defrost comprises the steps of:
operating the fan gear of the indoor unit to be adjusted to the lowest gear, and simultaneously opening the electronic expansion valve of the indoor unit to the maximum opening; the heat exchange quantity of the indoor unit is reduced; meanwhile, the opening of the outdoor unit main electronic expansion valve is opened to the maximum opening, and the defrosting electromagnetic valve is closed; and then the defrosting electronic expansion valve of the outdoor unit is opened.
8. The defrost control method of claim 1 wherein said reverse defrost includes the steps of: the four-way valve is used for reversing, and high-temperature and high-pressure gaseous refrigerant discharged by the compressor passes through the four-way valve and then flows through the outdoor heat exchanger to release heat so as to defrost the outdoor heat exchanger; meanwhile, the defrosting electronic expansion valve of the outdoor unit is opened, and the condensed liquid refrigerant absorbs heat through the heat storage material and the indoor unit.
9. The defrost control method of claim 1, wherein said modifying the present defrost access mode comprises: at the actual defrosting time t (n-1) And when the standard time t is less than, the defrosting mode selection is decreased progressively.
10. An air conditioner is characterized by comprising a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, an outdoor main electronic expansion valve and a hot gas bypass branch, wherein one end of the hot gas bypass branch is connected to a compressor exhaust pipe, the other end of the hot gas bypass branch is connected between the outdoor heat exchanger and the outdoor main electronic expansion valve, a defrosting branch is further arranged between the outdoor heat exchanger and the compressor, the defrosting branch is provided with an outdoor defrosting electronic expansion valve and used for controlling the flow of a refrigerant on the defrosting branch, a coil pipe and a heat storage material wrapping the compressor are arranged on the periphery of the compressor, the refrigerant flowing through the coil pipe can absorb the heat of the heat storage material, and the air conditioner can execute the defrosting control method according to any one of claims 1 to 9.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123147A (en) * | 2013-03-27 | 2013-05-29 | 宁波奥克斯空调有限公司 | Variable refrigerant flow air conditioning system and control method thereof |
| CN104251580A (en) * | 2013-06-26 | 2014-12-31 | 珠海格力电器股份有限公司 | Air conditioning system |
| CN104633836A (en) * | 2013-11-14 | 2015-05-20 | 珠海格力电器股份有限公司 | Defrosting control method for air conditioner |
| CN109959120A (en) * | 2019-03-21 | 2019-07-02 | 宁波奥克斯电气股份有限公司 | The Defrost method and air conditioner of air conditioner |
| CN109990517A (en) * | 2019-04-15 | 2019-07-09 | 宁波工程学院 | Air conditioner intelligence quickly defrosting and protection control method |
| WO2022110761A1 (en) * | 2020-11-30 | 2022-06-02 | 青岛海信日立空调系统有限公司 | Air conditioner |
-
2022
- 2022-08-23 CN CN202211010619.1A patent/CN115342482A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123147A (en) * | 2013-03-27 | 2013-05-29 | 宁波奥克斯空调有限公司 | Variable refrigerant flow air conditioning system and control method thereof |
| CN104251580A (en) * | 2013-06-26 | 2014-12-31 | 珠海格力电器股份有限公司 | Air conditioning system |
| CN104633836A (en) * | 2013-11-14 | 2015-05-20 | 珠海格力电器股份有限公司 | Defrosting control method for air conditioner |
| CN109959120A (en) * | 2019-03-21 | 2019-07-02 | 宁波奥克斯电气股份有限公司 | The Defrost method and air conditioner of air conditioner |
| CN109990517A (en) * | 2019-04-15 | 2019-07-09 | 宁波工程学院 | Air conditioner intelligence quickly defrosting and protection control method |
| WO2022110761A1 (en) * | 2020-11-30 | 2022-06-02 | 青岛海信日立空调系统有限公司 | Air conditioner |
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