CN106871382B - Defrosting operation method for air conditioner without stopping - Google Patents
Defrosting operation method for air conditioner without stopping Download PDFInfo
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- CN106871382B CN106871382B CN201710214514.0A CN201710214514A CN106871382B CN 106871382 B CN106871382 B CN 106871382B CN 201710214514 A CN201710214514 A CN 201710214514A CN 106871382 B CN106871382 B CN 106871382B
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- 238000010257 thawing Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 239000003507 refrigerant Substances 0.000 description 35
- 230000008569 process Effects 0.000 description 13
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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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- 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
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- Mechanical Engineering (AREA)
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Atmospheric Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting operation method without shutdown of an air conditioner. The defrosting method for the air conditioner without stopping the machine comprises the following steps: controlling the heating operation of the air conditioner; detecting the temperature of the outdoor coil pipe; adjusting the working state of the outdoor heat exchanger according to the temperature of the outdoor coil pipe; detecting a temperature deviation between an indoor temperature and a set temperature when the outdoor heat exchanger is adjusted to a preset condition; and adjusting the working state of the outdoor heat exchanger according to the temperature deviation, so that one of the first outdoor heat exchanger and the second outdoor heat exchanger operates to absorb heat, and the other one operates to release heat and defrost. According to the technical scheme, the air conditioner can be operated in a defrosting mode without stopping, and the comfort level of the air conditioner is improved.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a defrosting operation method without shutdown of an air conditioner.
Background
The existing air conditioner has the possibility of frosting in the heating operation process, and defrosting is needed after the frosting reaches a certain degree, otherwise, the heating effect is increasingly poor, but the indoor heating of the existing air conditioner is stopped in the defrosting process, even the indoor temperature is reduced, namely, the existing air conditioner is uncomfortable and cannot save energy.
Disclosure of Invention
The invention aims to provide a defrosting operation method without stopping an air conditioner, which can enable the air conditioner to defrost without stopping the air conditioner and improve the comfort level of the air conditioner.
According to an aspect of the present invention, there is provided a defrosting method for an air conditioner without stopping operation, comprising: controlling the heating operation of the air conditioner; detecting the temperature of the outdoor coil pipe; adjusting the working state of the outdoor heat exchanger according to the temperature of the outdoor coil pipe; detecting a temperature deviation between an indoor temperature and a set temperature when the outdoor heat exchanger is adjusted to a preset condition; and adjusting the working state of the outdoor heat exchanger according to the temperature deviation, so that one of the first outdoor heat exchanger and the second outdoor heat exchanger operates to absorb heat, and the other one operates to release heat and defrost.
Preferably, the step of adjusting the operating condition of the outdoor heat exchanger according to the outdoor coil temperature comprises: and when b < a < T1 or b < T1< a, controlling the first control valve, the fourth control valve, the fifth control valve and the seventh control valve to be opened, controlling the second control valve, the third control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to absorb heat, and controlling the second outdoor heat exchanger to release heat and defrost, wherein a is the coil temperature of the first outdoor heat exchanger, b is the coil temperature of the second outdoor heat exchanger, and T1 is the set temperature.
Preferably, the preset conditions include: the coil temperature of the second outdoor heat exchanger is greater than T2 for more than time T1.
Preferably, the step of adjusting the operation state of the outdoor heat exchanger according to the temperature deviation includes:
and when the temperature deviation pn is less than or equal to T3, controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be opened, controlling the first control valve, the fourth control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to release heat and defrost, and controlling the second outdoor heat exchanger to absorb heat.
Preferably, the step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: when the temperature deviation pn is larger than T3, the second outdoor heat exchanger stops defrosting operation, and the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to absorb heat simultaneously and last for T2 time; and the second control valve, the third control valve, the fifth control valve and the seventh control valve are controlled to be opened, the first control valve, the fourth control valve and the sixth control valve are controlled to be closed, the first outdoor heat exchanger is controlled to release heat and defrost, and the second outdoor heat exchanger is controlled to absorb heat.
Preferably, the step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: detecting the coil temperature of the first outdoor heat exchanger; and when the coil temperature of the first outdoor heat exchanger is more than T4 and the duration exceeds T3, controlling the third control valve, the fifth control valve and the sixth control valve to be opened, controlling the first control valve, the second control valve, the fourth control valve and the seventh control valve to be closed, and controlling the first outdoor heat exchanger and the second outdoor heat exchanger to absorb heat.
Preferably, the step of adjusting the operating condition of the outdoor heat exchanger according to the outdoor coil temperature comprises: and when b < a < T1 or b < T1< a is not satisfied, controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be opened, controlling the first control valve, the fourth control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to release heat and defrost, and controlling the second outdoor heat exchanger to absorb heat, wherein a is the coil temperature of the first outdoor heat exchanger, b is the coil temperature of the second outdoor heat exchanger, and T1 is the set temperature.
Preferably, the preset conditions include: the coil temperature of the first outdoor heat exchanger is greater than T5 for more than time T4.
Preferably, the step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: and when the temperature deviation pn is less than or equal to T6, controlling the first control valve, the fourth control valve, the fifth control valve and the seventh control valve to be opened, controlling the second control valve, the third control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to absorb heat, and controlling the second outdoor heat exchanger to release heat and defrost.
Preferably, the step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: when the temperature deviation pn is larger than T6, the first outdoor heat exchanger stops defrosting operation, and the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to absorb heat simultaneously and last for T5 time; and controlling the first control valve, the fourth control valve, the fifth control valve and the seventh control valve to be opened, controlling the second control valve, the third control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to absorb heat, and controlling the second outdoor heat exchanger to release heat and defrost.
Preferably, the step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: detecting the coil temperature of the second outdoor heat exchanger; and when the coil temperature of the second outdoor heat exchanger is greater than T7 and the duration exceeds T6, controlling the third control valve, the fifth control valve and the sixth control valve to be opened, controlling the first control valve, the second control valve, the fourth control valve and the seventh control valve to be closed, and controlling the first outdoor heat exchanger and the second outdoor heat exchanger to absorb heat.
According to the technical scheme, in the running process of the air conditioner, the coil temperature of the outdoor heat exchanger is detected, the defrosting sequence of the first outdoor heat exchanger and the second outdoor heat exchanger is adjusted according to the temperature of the outdoor coil, so that the outdoor heat exchanger with serious frost problem is defrosted firstly, and then the outdoor heat exchanger with slight frost problem is defrosted, so that the first outdoor heat exchanger and the second outdoor heat exchanger are defrosted alternately, and defrosting without stopping the machine is realized; when the outdoor heat exchangers are adjusted to the preset conditions, the defrosting of the two outdoor heat exchangers is completed, so that the indoor temperature deviation can be detected, the air conditioner can be further adjusted according to the detection result, the indoor temperature can be rapidly adjusted on the basis of keeping high operation energy efficiency, the indoor temperature can rapidly meet the user requirements, the operation energy efficiency of the air conditioner is improved, and the operation cost is reduced.
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 invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flow chart of a defrosting method for an air conditioner without stopping operation according to an embodiment of the present invention;
fig. 3 is a flowchart of a defrosting method for an air conditioner without stopping operation according to an embodiment of the present invention.
Description of reference numerals: 110. a compressor; 120. a four-way valve; 130. an indoor heat exchanger; 140. a first throttling device; 150. a first outdoor heat exchanger; 160. a second outdoor heat exchanger; 170. a second throttling device; 181. a first control valve; 182. a second control valve; 183. a third control valve; 184. a fourth control valve; 185. a fifth control valve; 186. a sixth control valve; 187. a seventh control valve.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Referring to fig. 1 in combination, an embodiment of the present invention provides an air conditioner, including a compressor 110, a four-way valve 120, an indoor heat exchanger 130, an outdoor heat exchanger, and a first throttling device 140, where the first throttling device 140 is disposed between the indoor heat exchanger 130 and the outdoor heat exchanger, the outdoor heat exchanger includes a first outdoor heat exchanger 150 and a second outdoor heat exchanger 160, and when the air conditioner is in heating operation, the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 have a first operating state in which the first outdoor heat exchanger 150 absorbs heat and the second outdoor heat exchanger 160 releases heat, a second operating state in which the first outdoor heat exchanger 150 releases heat and the second outdoor heat exchanger 160 absorbs heat, and a third operating state in which both the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 absorb heat, where a heat exchange area of the first outdoor heat exchanger 150 is S1, a heat exchange area of the second outdoor heat exchanger 160 is S2, wherein S1> S2.
When the second outdoor heat exchanger 160 needs defrosting, the air conditioner can be controlled to be in the first working state, at this time, the high-temperature and high-pressure refrigerant compressed by the compressor 110 firstly releases heat through the second outdoor heat exchanger 160 and the indoor heat exchanger 130, the refrigerant is used for indoor heating and defrosting of the second outdoor heat exchanger 160, and the refrigerant after heat exchange returns to the compressor 110 after absorbing heat through the first outdoor heat exchanger 150; when the first outdoor heat exchanger 150 needs defrosting, the air conditioner can be controlled to be in the second working state, at this time, the high-temperature and high-pressure refrigerant compressed by the compressor 110 firstly releases heat through the first outdoor heat exchanger 150 and the indoor heat exchanger 130, the refrigerant is used for indoor heating and defrosting of the first outdoor heat exchanger 150, and the refrigerant after heat exchange returns to the compressor 110 after absorbing heat through the second outdoor heat exchanger 160; when the outdoor unit of the air conditioner does not need defrosting, the air conditioner may be controlled to be in the third operating state, at this time, the high-temperature and high-pressure refrigerant compressed by the compressor 110 first releases heat through the indoor heat exchanger 130 for indoor heating, and the heat-exchanged refrigerant returns to the compressor 110 after absorbing heat through the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160.
The heat exchange area of the first outdoor heat exchanger 150 is S1, the heat exchange area of the second outdoor heat exchanger 160 is S2, the heat exchange area S of the outdoor heat exchanger is S1+ S2, optionally S1 is 70% S, and S2 is 30% S. The sizes of S1 and S2 can be set by those skilled in the art according to actual needs, S1 and S2 can be the same, and the heat exchange areas of the two outdoor heat exchangers are set to different values, so that the air conditioner can be adjusted according to different heat exchange amounts of indoor requirements, the indoor heating requirement can be met, and the outdoor heat exchangers can be ensured to defrost alternately, and the comfort level of the air conditioner can be improved.
According to the above technical scheme, when the air conditioner is operated for heating, when the outdoor heat exchange is required to be defrosted, the second outdoor heat exchanger 160 can be defrosted firstly, namely, the air conditioner is in the first working state, or the first outdoor heat exchanger 150 can be defrosted firstly, namely, the air conditioner is in the second working state, after the defrosting of the firstly defrosted outdoor heat exchanger is finished, the other outdoor heat exchanger is defrosted, so that when the air conditioner is defrosted, the indoor heating is not stopped, the indoor heat exchanger 130 is always in the heat release working state, and the comfort level of the air conditioner is improved.
As shown in fig. 1, an embodiment of the present invention provides an air conditioner, wherein a first end C of a first outdoor heat exchanger 150 is connected to a first interface a of a four-way reversing valve through a first pipeline, and is connected to a second interface B of the four-way reversing valve through a second pipeline, a first end E of a second outdoor heat exchanger 160 is connected to the first interface a of the four-way reversing valve through a third pipeline, and is connected to the second interface B of the four-way reversing valve through a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline are included between an indoor heat exchanger 130 and an outdoor heat exchanger, a first end G of the fifth pipeline is connected to a first end of the indoor heat exchanger 130, first ends of the sixth pipeline and the seventh pipeline are commonly connected to a second end H of the fifth pipeline, a second end of the sixth pipeline is connected to the first end C of the first outdoor heat exchanger 150, a second end of the seventh pipeline is respectively connected to a first branch and a second branch, the first branch is connected to the second end D of the first outdoor heat exchanger 150, the second branch is connected to the second end F of the second outdoor heat exchanger 160, the first pipeline is provided with a first control valve 181, the second pipeline is provided with a second control valve 182, the third pipeline is provided with a third control valve 183, the fourth pipeline is provided with a fourth control valve 184, the fifth pipeline is provided with a fifth control valve 185 and a first throttling device 140, the sixth pipeline is provided with a sixth control valve 186, the seventh pipeline is provided with a seventh control valve 187, and the second branch is provided with a second throttling device 170.
The fifth control valve 185 is used to cut off the paths of the indoor heat exchanger 130 and the outdoor heat exchanger, so that no new refrigerant flows into the outdoor heat exchanger after the refrigerant flows back to the compressor during later air-conditioning maintenance.
When the air conditioner is in heating operation, a high-temperature and high-pressure refrigerant flows out from the second interface B of the four-way valve 120, the first end C of the first outdoor heat exchanger 150 is connected with the second interface B of the four-way valve 120 through a second pipeline, the second control valve 182 is used for controlling the high-temperature and high-pressure refrigerant to flow through the first outdoor heat exchanger 150 to release heat and defrosting the first outdoor heat exchanger 150, meanwhile, the first end C of the first outdoor heat exchanger 150 is connected with the first interface a of the four-way valve 120 through a first pipeline, the first control valve 181 is used for controlling the refrigerant absorbing heat through the first outdoor heat exchanger 150 to flow back to the compressor 110, when the first outdoor heat exchanger 150 normally works, the second control valve 182 is closed, the first control valve 181 is opened, and when the first outdoor heat exchanger 150 needs defrosting, the second control valve 182 is opened and the first control valve 181 is. The first end E of the second outdoor heat exchanger 160 is connected to the second interface B of the four-way valve 120 through a fourth pipeline, the fourth control valve 184 is configured to control a high-temperature and high-pressure refrigerant to flow through the second outdoor heat exchanger 160 for heat release, and is used for defrosting the second outdoor heat exchanger 160, meanwhile, the first end E of the second outdoor heat exchanger 160 is connected to the first interface a of the four-way valve 120 through a third pipeline, the third control valve 183 is configured to control a refrigerant that absorbs heat through the second outdoor heat exchanger 160 to flow back to the compressor 110, when the second outdoor heat exchanger 160 normally operates, the fourth control valve 184 is closed, the third control valve 183 is opened, and when the second outdoor heat exchanger 160 needs defrosting, the fourth control valve 184 is opened, and the third control valve 183 is closed.
In the air heating defrosting operation process, when the air conditioner is in the first operating state, the first control valve 181, the fourth control valve 184, the fifth control valve 185 and the seventh control valve 187 are opened, the second control valve 182, the third control valve 183 and the sixth control valve 186 are closed, the refrigerant compressed by the compressor 110 flows out through the second interface B of the four-way valve 120, a part of the refrigerant flows into the second outdoor heat exchanger 160 to release heat, a part of the refrigerant flows into the indoor heat exchanger 130 to release heat, the refrigerant flowing through the second outdoor heat exchanger 160 returns to the first outdoor heat exchanger 150 to absorb heat after passing through the second throttling device 170, the high-temperature and high-pressure refrigerant flowing through the indoor heat exchanger 130 also returns to the first outdoor heat exchanger 150 to absorb heat after passing through the first throttling device 140, and the refrigerant flows back to the compressor 110 after absorbing heat from the first outdoor heat exchanger 150 through the first interface a of the four-way valve 120; when the air conditioner is in the second operating state, the second control valve 182, the third control valve 183, the fifth control valve 185, and the seventh control valve 187 are opened, the first control valve 181, the fourth control valve 184, and the sixth control valve 186 are closed, the refrigerant compressed by the compressor 110 flows out through the second port B of the four-way valve 120, a portion of the refrigerant flows into the first outdoor heat exchanger 150 to release heat, a portion of the refrigerant flows into the indoor heat exchanger 130 to release heat, the refrigerant flowing through the first outdoor heat exchanger 150 flows through the second throttling device 170 and then returns to the first outdoor heat exchanger 150 to absorb heat, the refrigerant flowing through the indoor heat exchanger 130 flows back to the second outdoor heat exchanger 160 through the second throttling device 170 again after passing through the first throttling device 140 to absorb heat, and the refrigerant flows back to the compressor 110 after absorbing heat from the second outdoor heat exchanger 160 through the first port a of the four-way valve 120.
In the heating non-defrosting operation process of the air conditioner, when the air conditioner is in a third operation state, when the air conditioner is in the third operation state, the third control valve 183, the fifth control valve 185 and the sixth control valve 186 are opened, the first control valve 181, the second control valve 182, the fourth control valve 184 and the seventh control valve 187 are closed, the refrigerant compressed by the compressor 110 flows out through the second interface B of the four-way valve 120, all flows into the indoor heat exchanger 130 to release heat, the refrigerant flowing out of the indoor heat exchanger 130 firstly absorbs heat through the first outdoor heat exchanger 150 after passing through the first throttling device 140, and then absorbs heat through the second outdoor heat exchanger 160 after passing through the second throttling device 170, and all the refrigerants are throttled twice and are gasified more thoroughly; the air conditioner can be in a fourth working state during the heating and defrosting-free working process, when the air conditioner is in the fourth working state, the first control valve 181, the third control valve 183, the fifth control valve 185 and the seventh control valve 187 are opened, the second control valve 182, the fourth control valve 184 and the sixth control valve 186 are closed, the refrigerant compressed by the compressor 110 flows out through the second interface B of the four-way valve 120, all flows into the indoor heat exchanger 130 to release heat, the refrigerant flowing out of the indoor heat exchanger 130 firstly passes through the indoor heat exchanger 130 to release heat, after passing through the first throttling device 140, a part of the refrigerant absorbs heat through the first outdoor heat exchanger 150 and directly returns to the compressor 110 through the first interface a of the four-way valve 120, the other part of the refrigerant absorbs heat through the second outdoor heat exchanger 160 after passing through the second throttling device 170 and then returns to the compressor 110 through the first interface a of the four-way valve 120, and the refrigerant passing through the second outdoor heat exchanger is throttled, the gasification is more thorough.
As shown in fig. 2 and fig. 3, an embodiment of the present invention further provides a defrosting method for an air conditioner without shutdown, including: controlling the heating operation of the air conditioner; detecting the temperature of the outdoor coil pipe; adjusting the working state of the outdoor heat exchanger according to the temperature of the outdoor coil pipe; detecting a temperature deviation between an indoor temperature and a set temperature when the outdoor heat exchanger is adjusted to a preset condition; and adjusting the working state of the outdoor heat exchanger according to the temperature deviation, so that one of the first outdoor heat exchanger and the second outdoor heat exchanger operates to absorb heat, and the other one operates to release heat and defrost.
In the running process of the air conditioner, the coil temperature of the outdoor heat exchanger is detected, the defrosting sequence of the first outdoor heat exchanger and the second outdoor heat exchanger is adjusted according to the temperature of the outdoor coil, so that the outdoor heat exchanger with serious frost problem is defrosted firstly, and then the outdoor heat exchanger with slight frost problem is defrosted, so that the first outdoor heat exchanger and the second outdoor heat exchanger are defrosted alternately, and defrosting without stopping the machine is realized; when the outdoor heat exchangers are adjusted to the preset conditions, the defrosting of the two outdoor heat exchangers is completed, so that the indoor temperature deviation can be detected, the air conditioner can be further adjusted according to the detection result, the indoor temperature can be rapidly adjusted on the basis of keeping high operation energy efficiency, the indoor temperature can rapidly meet the user requirements, the operation energy efficiency of the air conditioner is improved, and the operation cost is reduced.
The step of adjusting the operating condition of the outdoor heat exchanger according to the outdoor coil temperature comprises: when b < a < T1 or b < T1< a, the first control valve 181, the fourth control valve 184, the fifth control valve 185 and the seventh control valve 187 are controlled to be opened, the second control valve 182, the third control valve 183 and the sixth control valve 186 are controlled to be closed, the first outdoor heat exchanger 150 is controlled to absorb heat, and the second outdoor heat exchanger 160 is controlled to release heat and defrost, wherein a is the coil temperature of the first outdoor heat exchanger, b is the coil temperature of the second outdoor heat exchanger, and T1 is the set temperature.
When b < a < T1 or b < T1< a, it indicates that the surface temperature of the second outdoor heat exchanger 160 and the surface temperature of the first outdoor heat exchanger 150 both reach the frost condensation temperature, but the temperature of the second outdoor heat exchanger 160 is lower, so the frost formation problem is more serious, the heat exchange effect is worse, or the surface temperature of the second outdoor heat exchanger 160 reaches the frost condensation temperature and the surface temperature of the first outdoor heat exchanger 150 does not reach the frost condensation temperature, in both cases, the first outdoor heat exchanger 150 with a larger heat exchange amount can absorb heat, and the second outdoor heat exchanger 160 with a smaller heat exchange amount can release heat and defrost. For the condition that b is less than a and less than T1, because the defrosting time of the first outdoor heat exchanger 150 is longer than that of the second outdoor heat exchanger 160, the second outdoor heat exchanger 160 is controlled to defrost earlier than the first outdoor heat exchanger 150, the defrosting time can be reduced in the process of heating the indoor space, the influence of outdoor frost on air-conditioning heating is reduced, the smooth operation of the indoor heating is ensured, meanwhile, the stable heating of the indoor space is ensured through the first outdoor heat exchanger 150 with larger heat exchange amount, the defrosting treatment of the second outdoor heat exchanger 160 can be synchronously completed on the basis of realizing the efficient energy-saving operation of the air conditioner, and the defrosting operation of the second outdoor heat exchanger 160 is not stopped.
The preset conditions include: the coil temperature of the second outdoor heat exchanger 160 is greater than T2 for more than time T1. When the coil temperature of the second outdoor heat exchanger 160 is greater than T2 and continues to exceed the time T1, it indicates that the defrosting temperature and defrosting time of the second outdoor heat exchanger 160 are sufficient to provide enough defrosting heat to satisfy the heat requirement of the second outdoor heat exchanger 160 for sufficient defrosting, and therefore, it can be considered that the second outdoor heat exchanger 160 has finished defrosting.
The step of adjusting the working state of the outdoor heat exchanger according to the temperature deviation comprises: and when the temperature deviation pn is less than or equal to T3, controlling the second control valve 182, the third control valve 183, the fifth control valve 185 and the seventh control valve 187 to be opened, controlling the first control valve 181, the fourth control valve 184 and the sixth control valve 186 to be closed, controlling the first outdoor heat exchanger 150 to release heat and defrost, and controlling the second outdoor heat exchanger 160 to absorb heat. After the second outdoor heat exchanger 160 completes defrosting, if the indoor temperature deviation is smaller than the preset value, the indoor heating requirement can be met with less heat, and even if only the second outdoor heat exchanger 160 absorbs heat, enough heat can be provided for indoor heating. Therefore, at this time, after it is determined that the second outdoor heat exchanger 160 has finished defrosting, the first outdoor heat exchanger 150 may be controlled to release heat for defrosting, and the second outdoor heat exchanger 160 may be controlled to absorb heat for heating the indoor space, so as to ensure normal operation of indoor heating and achieve non-stop defrosting operation of the outdoor heat exchanger.
The step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: when the temperature deviation pn is greater than T3, the second outdoor heat exchanger 160 stops defrosting operation, and the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 are controlled to simultaneously absorb heat for T2 time; the second control valve 182, the third control valve 183, the fifth control valve 185, and the seventh control valve 187 are controlled to be opened, the first control valve 181, the fourth control valve 184, and the sixth control valve 186 are controlled to be closed, the first outdoor heat exchanger 150 is controlled to release heat and defrost, and the second outdoor heat exchanger 160 is controlled to absorb heat.
If the temperature deviation pn is greater than T3, it indicates that there is a large difference between the indoor temperature and the set temperature, so when the indoor temperature needs to be adjusted quickly and reaches the user set temperature as soon as possible, it is necessary that the outdoor heat exchanger can provide a large amount of heat to meet the heating requirement of the indoor heat exchanger 130, at this time, the amount of heat which can be provided by only the first outdoor heat exchanger 150 or the second outdoor heat exchanger 160 is not enough to meet the indoor heating requirement, so at this time, after the second outdoor heat exchanger 160 completes defrosting, defrosting and heat releasing of the second outdoor heat exchanger 160 can be stopped, at the same time, the first outdoor heat exchanger 150 is temporarily not controlled to perform heat releasing and defrosting, so that the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 absorb heat at the same time to ensure the indoor heating requirement, when the two outdoor heat exchangers absorb heat at the same time for a period of time, at this time, can only rely on second outdoor heat exchanger 160 to provide the heat transfer heat for indoor, consequently can release heat to first outdoor heat exchanger 150 this moment and change the frost, also can reduce the influence that causes the room temperature regulation when taking this kind of operating condition, reduce uncomfortable when the user uses and go, improve user's use impression.
The step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: detecting a coil temperature of the first outdoor heat exchanger 150; when the coil temperature of the first outdoor heat exchanger 150 is greater than T4 and the duration exceeds T3, the third control valve 183, the fifth control valve 185 and the sixth control valve 186 are controlled to be opened, the first control valve 181, the second control valve 182, the fourth control valve 184 and the seventh control valve 187 are controlled to be closed, and the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 are controlled to absorb heat. When the coil temperature of the first outdoor heat exchanger 150 is greater than T4 and the duration exceeds T3, it indicates that the defrosting of the first outdoor heat exchanger 150 has continued for a sufficient time, and it can be ensured that the defrosting of the first outdoor heat exchanger 150 is completed, at this time, both the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 complete one defrosting cycle, and both the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 can be controlled to absorb heat, so as to increase the regulation speed of the indoor temperature, and the indoor temperature can meet the requirements of users as soon as possible.
The step of adjusting the operating condition of the outdoor heat exchanger according to the outdoor coil temperature comprises: when b < a < T1 or b < T1< a is not satisfied, the second control valve 182, the third control valve 183, the fifth control valve 185 and the seventh control valve 187 are controlled to be opened, the first control valve 181, the fourth control valve 184 and the sixth control valve 186 are controlled to be closed, the first outdoor heat exchanger 150 is controlled to release heat and defrost, and the second outdoor heat exchanger 160 is controlled to absorb heat, wherein a is the coil temperature of the first outdoor heat exchanger, b is the coil temperature of the second outdoor heat exchanger, and T1 is the set temperature. When b < a < T1 is not satisfied, there are cases such as a < b < T1, or a < T1< b, or T1< a < b, etc. Under the conditions, because the surface temperature of the first outdoor heat exchanger 150 is lower, the possibility of frost condensation is higher, in the heating operation process of the air conditioner, the first outdoor heat exchanger 150 needs to be controlled preferentially to release heat and defrost, the second outdoor heat exchanger 160 absorbs heat, one of the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 is defrosted, and the other provides heat required by indoor heating, the non-stop defrosting operation of the air conditioner is realized, meanwhile, the great influence on indoor temperature regulation is avoided, the indoor temperature can be kept in a proper range all the time, and the requirement of comfort level of a human body is met.
When the first outdoor heat exchanger 150 is first defrosted, the preset conditions include: the coil temperature of the first outdoor heat exchanger 150 is greater than T5 for more than time T4. When the coil temperature of the first outdoor heat exchanger is greater than T5 and lasts for more than time T4, it indicates that the defrosting temperature and defrosting time of the first outdoor heat exchanger 150 are sufficient to provide enough defrosting heat to satisfy the heat requirement of the first outdoor heat exchanger 150 for sufficient defrosting, and thus the first outdoor heat exchanger 150 can be considered to have finished defrosting.
The step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: and when the temperature deviation pn is less than or equal to T6, controlling the first control valve 181, the fourth control valve 184, the fifth control valve 185 and the seventh control valve 187 to be opened, controlling the second control valve 182, the third control valve 183 and the sixth control valve 186 to be closed, controlling the first outdoor heat exchanger 150 to absorb heat, and controlling the second outdoor heat exchanger 160 to release heat and defrost. After the first outdoor heat exchanger 150 completes defrosting, if the difference between the indoor environment temperature and the set temperature is within the preset value range, it is indicated that the indoor environment temperature is basically adjusted in place, and only a small amount of heat is needed to meet the indoor heating requirement, that is, only the first outdoor heat exchanger 150 absorbs heat, and enough heat can be provided for indoor heating, therefore, at this moment, after it is determined that the first outdoor heat exchanger 150 completes defrosting, the second outdoor heat exchanger 160 can be controlled to release heat and defrost, and at the same time, the first outdoor heat exchanger 150 is controlled to absorb heat to heat indoors, so that normal operation of indoor heating is ensured, and meanwhile, non-stop defrosting operation of the outdoor heat exchanger is realized.
The step of adjusting the operating state of the outdoor heat exchanger according to the temperature deviation further includes: when the temperature deviation pn is greater than T6, the first outdoor heat exchanger 150 stops defrosting operation, and the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 are controlled to simultaneously absorb heat for T5 time; the first control valve 181, the fourth control valve 184, the fifth control valve 185 and the seventh control valve 187 are controlled to be opened, the second control valve 182, the third control valve 183 and the sixth control valve 186 are controlled to be closed, the first outdoor heat exchanger 150 is controlled to absorb heat, and the second outdoor heat exchanger 160 releases heat and defrosts.
If the difference between the indoor environment temperature and the set temperature exceeds the preset value range, the difference between the indoor environment temperature and the set temperature is large, and the heat which can be provided by only the first outdoor heat exchanger 150 is not enough to meet the requirement of quickly adjusting the indoor temperature, so that the defrosting and heat releasing of the first outdoor heat exchanger 150 can be stopped after the first outdoor heat exchanger 150 completes defrosting, and simultaneously the second outdoor heat exchanger 160 is not controlled to release heat and defrost temporarily, so that the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 absorb heat simultaneously, the indoor heating requirement is ensured, when the two outdoor heat exchangers absorb heat simultaneously for a period of time, the indoor temperature deviation is reduced, the heat exchange heat can be provided for the indoor by only the first outdoor heat exchanger 150, therefore, the heat releasing and defrosting can be performed on the second outdoor heat exchanger 160 at the moment, and the influence on the indoor temperature adjustment when the working state is adopted can also be reduced, the discomfort of the user during the use is reduced, and the use feeling of the user is improved.
The step of adjusting the working state of the outdoor heat exchanger according to the outdoor ambient temperature further comprises: detecting the coil temperature of the second outdoor heat exchanger 160; when the coil temperature of the second outdoor heat exchanger 160 is greater than T7 and the duration exceeds T6, the third control valve 183, the fifth control valve 185 and the sixth control valve 186 are controlled to be opened, the first control valve 181, the second control valve 182, the fourth control valve 184 and the seventh control valve 187 are controlled to be closed, and the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 are controlled to absorb heat. When the coil temperature of the second outdoor heat exchanger 160 is greater than T7 and the duration exceeds T6, it indicates that the defrosting of the second outdoor heat exchanger 160 has continued for a sufficient time, and it can be ensured that the defrosting of the second outdoor heat exchanger 160 is completed, at this time, both the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 complete one defrosting cycle, and both the first outdoor heat exchanger 150 and the second outdoor heat exchanger 160 can be controlled to absorb heat, so as to increase the adjustment speed of the indoor temperature, and the indoor temperature can meet the requirements of users as soon as possible.
Among the above parameters, T1 is, for example, -5 ℃, T2 is, for example, 6 ℃, T3 is, for example, 2 ℃, T4 is, for example, 6 ℃, T5 is, for example, 6 ℃, T6 is, for example, 2 ℃, T7 is, for example, 6 ℃, T1 is, for example, 1min, T2 is, for example, 10min, T3 is, for example, 1min, T4 is, for example, 1min, T5 is, for example, 15min, and T6 is, for example, 1 min.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. A defrosting method for an air conditioner running without stopping the machine is disclosed, wherein the air conditioner comprises a first outdoor heat exchanger, a second outdoor heat exchanger, a four-way reversing valve and an indoor heat exchanger; the first end of the first outdoor heat exchanger is connected with the first interface of the four-way reversing valve through a first pipeline and is connected with the second interface of the four-way reversing valve through a second pipeline, the first end of the second outdoor heat exchanger is connected with the first interface of the four-way reversing valve through a third pipeline and is connected with the second interface of the four-way reversing valve through a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline are arranged between the indoor heat exchanger and the outdoor heat exchanger, the first end of the fifth pipeline is connected with the first end of the indoor heat exchanger, the first ends of the sixth pipeline and the seventh pipeline are connected to the second end of the fifth pipeline together, the second end of the sixth pipeline is connected with the first end of the first outdoor heat exchanger, and the second end of the seventh pipeline is connected with a first branch and a second branch respectively, the first branch is connected to the second end of the first outdoor heat exchanger, the second branch is connected to the second end of the second outdoor heat exchanger, a first control valve is arranged on the first pipeline, a second control valve is arranged on the second pipeline, a third control valve is arranged on the third pipeline, a fourth control valve is arranged on the fourth pipeline, a fifth control valve is arranged on the fifth pipeline, a sixth control valve is arranged on the sixth pipeline, and a seventh control valve is arranged on the seventh pipeline, and the method is characterized by comprising the following steps:
controlling the heating operation of the air conditioner;
detecting the temperature of the outdoor coil pipe;
adjusting the working state of the outdoor heat exchanger according to the temperature of the outdoor coil pipe;
detecting a temperature deviation between an indoor temperature and a set temperature when the outdoor heat exchanger is adjusted to a preset condition;
adjusting the working state of the outdoor heat exchanger according to the temperature deviation, so that one of the first outdoor heat exchanger and the second outdoor heat exchanger operates to absorb heat, and the other one operates to release heat and defrost;
wherein, adjust the operating condition of outdoor heat exchanger according to outdoor coil pipe temperature, include: when b < a < T1 or b < T1< a, controlling the first control valve, the fourth control valve, the fifth control valve and the seventh control valve to be opened, controlling the second control valve, the third control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to absorb heat, and controlling the second outdoor heat exchanger to release heat and defrost, wherein a is the coil temperature of the first outdoor heat exchanger, b is the coil temperature of the second outdoor heat exchanger, and T1 is the set temperature; and/or when b < a < T1 or b < T1< a is not satisfied, controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be opened, controlling the first control valve, the fourth control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to release heat and defrost, and controlling the second outdoor heat exchanger to absorb heat, wherein a is the coil temperature of the first outdoor heat exchanger, b is the coil temperature of the second outdoor heat exchanger, and T1 is the set temperature.
2. The defrosting method without stopping operation of an air conditioner according to claim 1, wherein when b < a < T1 or b < T1< a, the preset conditions include:
the coil temperature of the second outdoor heat exchanger is greater than T2 for more than time T1.
3. The defrosting method without stopping operation of an air conditioner according to claim 2, wherein the step of adjusting the operation state of the outdoor heat exchanger according to the temperature deviation includes:
and when the temperature deviation pn is less than or equal to T3, controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be opened, controlling the first control valve, the fourth control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to release heat and defrost, and controlling the second outdoor heat exchanger to absorb heat.
4. The defrosting method without stopping operation of an air conditioner according to claim 2, wherein the step of adjusting the operation state of the outdoor heat exchanger according to the temperature deviation further comprises:
when the temperature deviation pn is larger than T3, the second outdoor heat exchanger stops defrosting operation, and the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to absorb heat simultaneously and last for T2 time;
and the second control valve, the third control valve, the fifth control valve and the seventh control valve are controlled to be opened, the first control valve, the fourth control valve and the sixth control valve are controlled to be closed, the first outdoor heat exchanger is controlled to release heat and defrost, and the second outdoor heat exchanger is controlled to absorb heat.
5. The defrosting method without shutdown operation of an air conditioner according to claim 3 or 4, wherein when the temperature deviation pn is less than or equal to T3, or when the first outdoor heat exchanger and the second outdoor heat exchanger absorb heat simultaneously and last for T2 time, after controlling the first outdoor heat exchanger to release heat and defrost and the second outdoor heat exchanger to absorb heat, further comprising:
detecting the coil temperature of the first outdoor heat exchanger;
and when the coil temperature of the first outdoor heat exchanger is more than T4 and the duration exceeds T3, controlling the third control valve, the fifth control valve and the sixth control valve to be opened, controlling the first control valve, the second control valve, the fourth control valve and the seventh control valve to be closed, and controlling the first outdoor heat exchanger and the second outdoor heat exchanger to absorb heat.
6. The defrosting method without stop operation of an air conditioner according to claim 1, wherein when b < a < T1 or b < T1< a is not satisfied, the preset condition includes:
the coil temperature of the first outdoor heat exchanger is greater than T5 for more than time T4.
7. The defrosting method without stopping operation of an air conditioner according to claim 6, wherein the step of adjusting the operation state of the outdoor heat exchanger according to the temperature deviation further comprises:
and when the temperature deviation pn is less than or equal to T6, controlling the first control valve, the fourth control valve, the fifth control valve and the seventh control valve to be opened, controlling the second control valve, the third control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to absorb heat, and controlling the second outdoor heat exchanger to release heat and defrost.
8. The defrosting method without stopping operation of an air conditioner according to claim 6, wherein the step of adjusting the operation state of the outdoor heat exchanger according to the temperature deviation further comprises:
when the temperature deviation pn is larger than T6, the first outdoor heat exchanger stops defrosting operation, and the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to absorb heat simultaneously and last for T5 time;
and controlling the first control valve, the fourth control valve, the fifth control valve and the seventh control valve to be opened, controlling the second control valve, the third control valve and the sixth control valve to be closed, controlling the first outdoor heat exchanger to absorb heat, and controlling the second outdoor heat exchanger to release heat and defrost.
9. The defrosting method without shutdown of an air conditioner according to claim 7 or 8, wherein when the temperature deviation pn is less than or equal to T6, or when the first outdoor heat exchanger and the second outdoor heat exchanger absorb heat simultaneously and last for T5 time, after controlling the first outdoor heat exchanger to absorb heat and the second outdoor heat exchanger to release heat and defrost, the method further comprises:
detecting the coil temperature of the second outdoor heat exchanger;
and when the coil temperature of the second outdoor heat exchanger is greater than T7 and the duration exceeds T6, controlling the third control valve, the fifth control valve and the sixth control valve to be opened, controlling the first control valve, the second control valve, the fourth control valve and the seventh control valve to be closed, and controlling the first outdoor heat exchanger and the second outdoor heat exchanger to absorb heat.
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| EP2600082B1 (en) * | 2010-07-29 | 2018-09-26 | Mitsubishi Electric Corporation | Heat pump |
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| CN104011485A (en) * | 2012-01-24 | 2014-08-27 | 三菱电机株式会社 | Air-Conditioning Unit |
| CN105247302A (en) * | 2013-05-31 | 2016-01-13 | 三菱电机株式会社 | Air conditioner |
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