CN106679106B - A kind of air conditioner defrosting control method and device - Google Patents
A kind of air conditioner defrosting control method and device Download PDFInfo
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- CN106679106B CN106679106B CN201710020248.8A CN201710020248A CN106679106B CN 106679106 B CN106679106 B CN 106679106B CN 201710020248 A CN201710020248 A CN 201710020248A CN 106679106 B CN106679106 B CN 106679106B
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- heat exchange
- defrost
- exchange branch
- branch
- air conditioner
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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
- F24F11/62—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
-
- 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
-
- 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
-
- 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
-
- 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
- F24F11/62—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
Abstract
The present invention relates to air conditioner controlling technology field more particularly to a kind of air conditioner defrosting control methods and device.Air conditioner defrosting control method includes: S0, and air conditioner enters defrost pattern；S1, from, to select a progress defrost in defrost heat exchange branch, the heat exchange branch and air conditioner refrigerant pipeline connection in defrost, remaining heat exchange branch are disconnected with refrigerant line in a plurality of heat exchange branch in parallel；S2 obtains the actual pressure for the branch that exchanges heat in defrost；S3 compares the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；The heat exchange branch defrost is completed if being more than, and executes step S4；Otherwise, step S2 is executed；S4 judges whether that the return step S1 if there is also the branch that exchanges heat to defrost thens follow the steps S5 if all completing to the defrost of defrost heat exchange branch there is also to defrost heat exchange branch；S5, air conditioner terminate defrost pattern.Defrost is thoroughly and defrost speed is fast.
Description
Technical field
The present invention relates to air conditioner controlling technology field more particularly to a kind of air conditioner defrosting control methods and device.
Background technique
In the prior art, air-conditioning system at low ambient temperatures heating operation when, outdoor heat exchanger would generally frosting, shadow
Ring the efficiency of heat exchange.
Medium-and-large-sized air conditioner multithread pipeline heat exchanger flow path is more, especially high energy efficiency product, and compressor displacement is small, heat exchanger
Big and flow path is more, the sordid problem of heat exchanger middle and lower part defrosting often occurs.It defrosts the incipient stage, the gaseous state of high temperature and pressure is cold
The frost of matchmaker and heat exchanger is since temperature differencies form violent heat exchange, but after 1,2 minute, refrigerant starts to be layered, high temperature
The high-pressure gaseous refrigerant inflow heat exchanger upper half, temperature is higher and higher, and low temperature liquid refrigerant is due to gravity inflow heat exchanger
Lower half, since liquid flow resistance is larger, the refrigerant of lower half does not flow substantially, that is to say, that the liquid refrigerants in pipe can not
The temperature difference can not be formed with the frost outside pipe, can not acutely be exchanged heat, causes lower half heat exchanger that can not defrost, even if defrosting time is again
It is long, but also to consider 20% of defrost time no more than the defrost period, the unclean position of defrost is not still changed.For a long time
Bottom defrost is not clean and the defrost period is longer, causes bottom frosting thicker, vicious circle, leads to heating capacity decline, sky
Draught temperature reduction is recalled, the comfort of user is influenced.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is to solve the problems, such as that air conditioner defrosting is sordid in the prior art.
(2) technical solution
In order to solve the above-mentioned technical problems, the present invention provides a kind of air conditioner defrosting control method,
Air conditioner enters defrost pattern, which comprises
S0, air conditioner enter defrost pattern；
S1, from outdoor heat exchanger it is a plurality of be arranged in parallel heat exchange branch in defrost heat exchange branch in selection one into
Row defrost, heat exchange branch and air conditioner refrigerant pipeline connection in the defrost, remaining heat exchange branch are disconnected with refrigerant line
It opens；
S2 obtains the actual pressure for the branch that exchanges heat in defrost in real time；
S3 compares the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；If being changed in above-mentioned defrost
When the actual pressure of hot branch is more than the preset pressure of the heat exchange branch, then the heat exchange branch defrost is completed, and executes step S4；It is no
Then, step S2 is executed；
S4, judge whether there is also to defrost exchange heat branch, if there is also to defrost exchange heat branch if return step S1, if
It is all completed to the defrost of defrost heat exchange branch, thens follow the steps S5；
S5, air conditioner terminate defrost pattern.
According to the present invention, it in step S1, is successively chosen according to by the sequence of positions at the top of the outdoor heat exchanger to bottom
The branch that exchanges heat carries out defrost.
According to the present invention, the heat exchange branch be equipped with two, respectively first heat exchange branch and second heat exchange branch；It is described
Control method comprising steps of
S0 ', air conditioner enter defrost pattern；
S1 ', the first heat exchange branch carry out defrost；
S2 ' obtains the actual pressure of the first heat exchange branch in real time；
S3 ', the actual pressure of comparison the first heat exchange branch and the preset pressure of the first heat exchange branch；If the first heat exchange branch
Actual pressure be more than first heat exchange branch preset pressure, then first heat exchange branch defrost complete, execute step S4 '；Otherwise,
Execute step S2 '；
S4 ', the second heat exchange branch carry out defrost；
S5 ' obtains the actual pressure of the second heat exchange branch in real time；
S6 ', the actual pressure of comparison the second heat exchange branch and the preset pressure of the second heat exchange branch；If the second default heat exchange
The actual pressure of branch is more than that the preset pressure of the second heat exchange branch thens follow the steps S7 '；Otherwise, step S5 ' is continued to execute；
S7 ', air conditioner terminate defrost pattern.
According to the present invention, the first heat exchange branch is located at the top of the outdoor heat exchanger, second heat exchange branch position
In the outdoor heat exchanger bottom.
According to the present invention, the first heat exchange branch and the second heat exchange branch pass through three-way magnetic valve and the refrigerant pipe
Road connection.
According to the present invention, the volume of the first heat exchange branch and the second heat exchange branch is all larger than the first heat exchange branch
With the 30% of the second heat exchange branch total volume.
According to the present invention, every heat exchange branch road is equipped with pressure sensor.
According to the present invention, the actual pressure of every heat exchange branch road is obtained when heating mode, and described is changed a plurality of
Compared with minimum value in the actual pressure of hot branch defrosts pressure with setting, if in the actual pressure of a plurality of heat exchange branch
Minimum value then controls air conditioner less than setting defrosting pressure and enters defrosting mode, otherwise keeps heating mode.
According to the present invention, judge whether that there is also to defrost heat exchange branch in step S4, comprising: the judgement heat exchange branch of defrost
Whether the number on road is equal to the total number of heat exchange branch, if the number of the heat exchange branch of defrost is equal to the total number of heat exchange branch
There is no to defrost heat exchange branch, otherwise exist to defrost heat exchange branch.
The present invention also provides a kind of air conditioner defrosting control devices, including
Defrosting mode is opened or terminated to mode control module for controlling air conditioner；
Pipeline control module, for being propped up from exchanging heat in a plurality of heat exchange branch being arranged in parallel of outdoor heat exchanger to defrost
A progress defrost is selected in road, at this time the heat exchange branch in the defrost and air conditioner refrigerant pipeline connection, remaining heat exchange branch
Lu Junyu refrigerant line disconnects；
Detection module, for obtaining the actual pressure for the branch that exchanges heat in defrost in real time；
Judgment module, for comparing the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；
If the actual pressure for the branch that exchanges heat in above-mentioned defrost is more than the preset pressure of the heat exchange branch, the heat exchange branch
Frost is completed, and further determines whether to control if there is also the branch that exchanges heat to defrost to pipeline there is also to defrost heat exchange branch
Module issues defrost instruction, if all completing to the defrost of defrost heat exchange branch, issuing terminates defrost pattern instruction；
To detection module when if the actual pressure for the branch that exchanges heat in above-mentioned defrost is no more than the preset pressure of the heat exchange branch
Issue detection instruction.
(3) beneficial effect
Above-mentioned technical proposal of the invention has the advantages that air-conditioning provided in an embodiment of the present invention compared with prior art
Device defrosting control method solves Air Conditioner under low temperature environment and defrosts not by carrying out defrost respectively to a plurality of heat exchange branch
The clean and low problem of rate that defrosts, ensure that the heating capacity and heating effect of air-conditioning, and since the defrost time is short, reduces
Influence during defrost to room temperature, effectively prevents the fluctuation of room temperature.And pass through in the embodiment of the present invention
Pressure judges whether each heat exchange branch defrosts completely, more intuitive accurate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the air conditioner of the embodiment of the present invention one and embodiment two；
Fig. 2 is the flow diagram for the air conditioner defrosting control method that the embodiment of the present invention one provides；
Fig. 3 is the flow diagram of air conditioner defrosting control method provided by Embodiment 2 of the present invention.
In figure, 1: compressor；2: outdoor heat exchanger；21: heat exchange branch；3: indoor heat exchanger；4: pressure sensor；5: four
Logical reversal valve；6: triple valve.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
The embodiment of the present invention one provides a kind of defrosting control method of air conditioner, as shown in Figure 1, air conditioner includes passing through
Compressor 1, outdoor heat exchanger 2, indoor heat exchanger 3 and the four-way reversing valve 5 of refrigerant line connection, in outdoor heat exchanger 2
Including a plurality of heat exchange branch 21 being arranged in parallel, every heat exchange branch 21 is optionally connected to refrigerant line.
As shown in Fig. 2, the control method includes:
S0, air conditioner enter defrost pattern；
S1, from outdoor heat exchanger it is a plurality of be arranged in parallel heat exchange branch in defrost heat exchange branch in selection one into
Row defrost, heat exchange branch and air conditioner refrigerant pipeline connection in the defrost, remaining heat exchange branch are disconnected with refrigerant line
It opens；Heat exchange branch is successively preferably chosen according to by the sequence of positions at the top of outdoor heat exchanger to bottom in the present embodiment
Frost；The heat exchange branch on preferential selection top carries out defrost to the heat exchange branch of lower part after carrying out defrost, avoids lower part heat exchange branch
Road defrost is completed to have the outer surface lower part heat exchange again again that water flow to lower part heat exchange branch when the heat exchange branch defrost of upper back
Road surfaces condensation, influences defrosting effect；
S2 obtains the actual pressure for the branch that exchanges heat in defrost in real time；
S3 compares the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；If being changed in above-mentioned defrost
When the actual pressure of hot branch is more than the preset pressure of the heat exchange branch, then the heat exchange branch defrost is completed, and executes step S4；It is no
Then, step S2 is executed；
S4, judge whether there is also to defrost exchange heat branch, if there is also to defrost exchange heat branch if return step S1, if
It is all completed to the defrost of defrost heat exchange branch, thens follow the steps S5；
S5, air conditioner terminate defrost pattern.
When practical application, the preset pressure of every heat exchange branch refers to should when only opening heat exchange branch connection refrigerant line
Loine pressure when the branch defrost that exchanges heat is clean, the preset pressure value can be obtained by passing through experiment before air conditioner factory,
And be recorded in controller, for the judgement during defrosting control.The actual pressure of heat exchange branch when defrosting control
It can be obtained by the way that pressure sensor 4 is arranged on every heat exchange branch road.
Air conditioner defrosting control method provided in an embodiment of the present invention is solved by carrying out defrost respectively to a plurality of heat exchange branch
Air Conditioner defrosting under low temperature environment of having determined is not clean and the low problem of rate that defrosts, and ensure that the heating capacity and system of air-conditioning
Thermal effect, and since the defrost time is short reduces the influence during defrost to room temperature, effectively prevents room temperature
Fluctuation.And judge whether each heat exchange branch defrosts completely by pressure in the embodiment of the present invention, it is more intuitive accurate.
Further, in this embodiment obtaining the actual pressure of every heat exchange branch road when heating mode, and changed a plurality of
Compared with minimum value in the actual pressure of hot branch defrosts pressure with setting, if the minimum in the actual pressure of a plurality of heat exchange branch
Value then controls air conditioner less than setting defrosting pressure and enters defrosting mode, otherwise keeps heating mode.When heat exchange branch frosting compared with
When more, the pressure for the branch that exchanges heat reduces.The actual pressures of multiple heat exchange branches may be because the flow of heat exchange branch it is different or its
The actual pressure of his reason, multiple heat exchange branches is not fully consistent, when the actual pressure of a certain item heat exchange branch is less than setting
When the pressure that defrosts, then needs air-conditioning to enter defrost pattern and carry out defrost.Judge whether to need defrost by the pressure for the branch that exchanges heat
It is more accurate to judge, can carry out defrost by the heat exchange branch to outdoor heat exchanger in time, ensure that the heating effect of air-conditioning.
Further, in this embodiment judging whether that there is also to defrost heat exchange branch in step S4, comprising: judgement has been changed
Whether the number of frost heat exchange branch is equal to the total number of heat exchange branch, if the number of the heat exchange branch of defrost is equal to heat exchange branch
Total number is then not present to defrost heat exchange branch, otherwise exists to defrost heat exchange branch.Judge whether that there is also exchange heat to defrost
The method of branch is not limited to this, and when carrying out heat exchange branch defrost according to the sequence of setting 1-N, can also pass through judgement upper one
Whether the heat exchange branch serial number of secondary defrost is equal to N to determine whether in the presence of to defrost heat exchange branch.
Embodiment two
Air conditioner defrosting control method provided by Embodiment 2 of the present invention, heat exchange branch is set in the outdoor heat exchanger of air conditioner
There are two, the respectively first heat exchange branch and the second heat exchange branch, the first heat exchange branch and the second heat exchange branch pass through triple valve 6
It is connect with refrigerant line；As shown in figure 3, control method comprising steps of
S0 ', air conditioner enter defrost pattern；
S1 ', the first heat exchange branch carry out defrost, i.e., the first heat exchange branch is connected to refrigerant line, the second heat exchange branch
It is disconnected with refrigerant line；
S2 ' obtains the actual pressure of the first heat exchange branch in real time；
S3 ', the actual pressure of comparison the first heat exchange branch and the preset pressure of the first heat exchange branch；If the first heat exchange branch
Actual pressure be more than first heat exchange branch preset pressure, then first heat exchange branch defrost complete, execute step S4 '；Otherwise,
Execute step S2 '.
S4 ', the second heat exchange branch carry out defrost, i.e., disconnect the first heat exchange branch and refrigerant line, connection second is changed
Hot branch and refrigerant line；
S5 ' obtains the actual pressure of the second heat exchange branch in real time；
S6 ', the actual pressure of comparison the second heat exchange branch and the preset pressure of the second heat exchange branch；If the second default heat exchange
The actual pressure of branch is more than that the preset pressure of the second heat exchange branch thens follow the steps S7 '；Otherwise, step S5 ' is continued to execute；
S7 ', air conditioner terminate defrost pattern.
When practical application, the preset pressure of the preset pressure of the first heat exchange branch and the second heat exchange branch can be by sky
It is obtained, and is recorded in controller by experiment before adjusting device factory, for the judgement during defrosting control.It changes when first
The first preset pressure and the second preset pressure are equal when hot branch is identical as the second heat exchange volume of branch.
Air conditioner defrosting control method provided by Embodiment 2 of the present invention by carrying out defrost respectively to two heat exchange branches,
Solve the problems, such as under low temperature environment that Air Conditioner defrosting is not clean and defrosting rate is low, ensure that air-conditioning heating capacity and
Heating effect, and since the defrost time is short reduces the influence during defrost to room temperature, effectively prevents Indoor Temperature
The fluctuation of degree.And judge whether each heat exchange branch defrosts completely by pressure in the embodiment of the present invention, it is more intuitive accurate.
Preferably, the first heat exchange branch is located outside at the top of heat exchanger in the present embodiment, and the second heat exchange branch is located outside
Exchanger base.Avoiding the water generated first to the first heat exchange branch defrost after the completion of the second heat exchange branch defrost can runner the
The surface of two heat exchange branches influences the defrosting effect of the second heat exchange branch.
Preferably, in the present embodiment first heat exchange branch and second heat exchange branch volume be all larger than the first heat exchange branch and
The 30% of second heat exchange branch total volume.The volume of preferably first heat exchange branch and the second heat exchange branch is equal.Avoid some
The volume of heat exchange branch is too small, is when the too small heat exchange branch of the volume is individually connected to will cause when refrigerant line carries out defrost
Pressure of uniting is excessive, causes compressor shutdown.The volume of first heat exchange branch and the second heat exchange branch is all larger than the first heat exchange branch
With the 30% of the second heat exchange branch total volume, the normal operation of system when ensure that each heat exchange branch independent defrost.
Embodiment three
The embodiment of the present invention three provides a kind of air conditioner defrosting control device, it is characterised in that: including scheme control mould
Defrosting mode is opened or terminated to block for controlling air conditioner；
Pipeline control module, for being propped up from exchanging heat in a plurality of heat exchange branch being arranged in parallel of outdoor heat exchanger to defrost
A progress defrost is selected in road, at this time the heat exchange branch in the defrost and air conditioner refrigerant pipeline connection, remaining heat exchange branch
Lu Junyu refrigerant line disconnects；
Detection module, for obtaining the actual pressure for the branch that exchanges heat in defrost in real time；
Judgment module, for comparing the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；
If the actual pressure for the branch that exchanges heat in above-mentioned defrost is more than the preset pressure of the heat exchange branch, the heat exchange branch
Frost is completed, and further determines whether to control if there is also the branch that exchanges heat to defrost to pipeline there is also to defrost heat exchange branch
Module issues defrost instruction, if all completing to the defrost of defrost heat exchange branch, terminates to mode control module sending
Defrost pattern instruction；
To detection module when if the actual pressure for the branch that exchanges heat in above-mentioned defrost is no more than the preset pressure of the heat exchange branch
Issue detection instruction.
It should be noted that the air conditioner defrosting control device that the embodiment of the present invention three provides is based in embodiment one and two
Air conditioner defrosting control method realize, all technical features including embodiment one and two, therefore can solve identical skill
Art problem reaches identical technical effect, and detailed content may refer to the content of above-described embodiment, and details are not described herein.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of air conditioner defrosting control method, it is characterised in that:
S0, air conditioner enter defrost pattern；
S1, from being changed in a plurality of heat exchange branch being arranged in parallel of outdoor heat exchanger to selection one in defrost heat exchange branch
Frost, heat exchange branch and air conditioner refrigerant pipeline connection in the defrost, remaining heat exchange branch are disconnected with refrigerant line, are pressed
Defrost is carried out according to heat exchange branch is successively chosen by the sequence of positions at the top of the outdoor heat exchanger to bottom；
S2 obtains the actual pressure for the branch that exchanges heat in defrost in real time；
S3 compares the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；If exchanging heat branch in above-mentioned defrost
When the actual pressure on road is more than the preset pressure of the heat exchange branch, then the heat exchange branch defrost is completed, and executes step S4；Otherwise,
Execute step S2；
S4 judges whether that there is also to defrost heat exchange branch, the return step S1 if there is also the branch that exchanges heat to defrost, if all
It is completed to the defrost of defrost heat exchange branch, thens follow the steps S5；
S5, air conditioner terminate defrost pattern.
2. air conditioner defrosting control method according to claim 1, it is characterised in that: the heat exchange branch is equipped with two,
Respectively first heat exchange branch and the second heat exchange branch；The control method comprising steps of
S0 ', air conditioner enter defrost pattern；
S1 ', the first heat exchange branch carry out defrost；
S2 ' obtains the actual pressure of the first heat exchange branch in real time；
S3 ', the actual pressure of comparison the first heat exchange branch and the preset pressure of the first heat exchange branch；If the reality of the first heat exchange branch
Border pressure is more than the preset pressure of the first heat exchange branch, then the first heat exchange branch defrost is completed, and executes step S4 '；Otherwise, it executes
Step S2 '；
S4 ', the second heat exchange branch carry out defrost；
S5 ' obtains the actual pressure of the second heat exchange branch in real time；
S6 ', the actual pressure of comparison the second heat exchange branch and the preset pressure of the second heat exchange branch；If the second default heat exchange branch
Actual pressure be more than second heat exchange branch preset pressure then follow the steps S7 '；Otherwise, step S5 ' is continued to execute；
S7 ', air conditioner terminate defrost pattern.
3. air conditioner defrosting control method according to claim 2, it is characterised in that: the first heat exchange branch is located at institute
It states at the top of outdoor heat exchanger, the second heat exchange branch is located at the outdoor heat exchanger bottom.
4. air conditioner defrosting control method according to claim 2, it is characterised in that: the first heat exchange branch and second
Heat exchange branch is connected to by three-way magnetic valve with the refrigerant line.
5. air conditioner defrosting control method according to claim 2, it is characterised in that: the first heat exchange branch and second
The volume of heat exchange branch is all larger than the 30% of the first heat exchange branch and the second heat exchange branch total volume.
6. air conditioner defrosting control method according to claim 1, it is characterised in that: every heat exchange branch road is all provided with
There is pressure sensor.
7. air conditioner defrosting control method according to claim 1, it is characterised in that: obtained described in every when heating mode
The actual pressure of heat exchange branch road, and by the minimum value in the actual pressure of a plurality of heat exchange branch and set defrosting pressure ratio
Compared with controlling air conditioner if the minimum value in the actual pressure of a plurality of heat exchange branch is less than setting defrosting pressure and enter defrosting
Otherwise mode keeps heating mode.
8. air conditioner defrosting control method according to claim 1, which is characterized in that judge whether in step S4 there is also
To defrost heat exchange branch, comprising: whether the number of the judgement heat exchange branch of defrost is equal to the total number of heat exchange branch, if defrost
Heat exchange branch number be equal to heat exchange branch total number be then not present to defrost exchange heat branch, otherwise exist to defrost exchange heat branch
Road.
The control device 9. a kind of air conditioner defrosts, it is characterised in that: including
Defrosting mode is opened or terminated to mode control module for controlling air conditioner；
Pipeline control module, for from the branch that exchanges heat to defrost in a plurality of heat exchange branch being arranged in parallel of outdoor heat exchanger
A progress defrost is selected, at this time the heat exchange branch in the defrost and air conditioner refrigerant pipeline connection, remaining heat exchange branch is equal
It is disconnected with refrigerant line；
Detection module, for obtaining the actual pressure for the branch that exchanges heat in defrost in real time；
Judgment module, for comparing the actual pressure for the branch that exchanges heat in defrost and the preset pressure of the heat exchange branch；
If the actual pressure for the branch that exchanges heat in above-mentioned defrost is more than the preset pressure of the heat exchange branch, the heat exchange branch defrost is complete
At further determining whether there is also exchanging heat branch to defrost, to pipeline control module if there is also the branch that exchanges heat to defrost
Defrost instruction is issued, if all completing to the defrost of defrost heat exchange branch, issuing to mode control module terminates defrost
Mode instruction；
If the actual pressure for the branch that exchanges heat in above-mentioned defrost issues when being no more than the preset pressure of the heat exchange branch to detection module
Detection instruction.
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| CN114110929A (en) * | 2021-11-12 | 2022-03-01 | 珠海格力电器股份有限公司 | Defrosting control method of air conditioner and air conditioner using same |
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