CN105987484B - Defrosting control method and system when the frequent high temperature-proof of air-conditioning heating is protected - Google Patents
Defrosting control method and system when the frequent high temperature-proof of air-conditioning heating is protected Download PDFInfo
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- CN105987484B CN105987484B CN201510091153.6A CN201510091153A CN105987484B CN 105987484 B CN105987484 B CN 105987484B CN 201510091153 A CN201510091153 A CN 201510091153A CN 105987484 B CN105987484 B CN 105987484B
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Abstract
Defrosting control method and system when high temperature-proof protection frequent the present invention relates to a kind of air-conditioning heating.For air-conditioning of the present invention in heating operation, whether detection air-conditioning is in frequent high temperature-proof guard mode, if so, detection outdoor environment temperature TOuter ring, outdoor coil temperature Te, pass through outdoor coil temperature Te≤TSettingCumulative time tbWith setting time tSettingRelationship judge whether to enter defrosting, indoor coil pipe fluctuates the influence to outdoor coil temperature when can be avoided air-conditioning frequent high temperature-proof guard mode, achievees the purpose that accurately to defrost.
Description
Technical field
The invention belongs to air-conditioner defrosting control technology fields, specifically, being to be related to a kind of frequent high temperature-proof of air-conditioning heating
Defrosting control method and system when protection.
Background technique
Air-conditioning heating operation at low ambient temperatures, when outdoor heat exchanger surface temperature is in subzero, and it is empty lower than environment
When gas dew-point temperature, it may appear that frost influences air-conditioning heating effect, needs to defrost to it.Convertible frequency air-conditioner one at present
As the defrosting control method that is combined using time and temperature: for example, under certain outdoor environment temperature, operation of air conditioner is more than setting
After time, such as continuous a period of time (such as: 2min) detects that outdoor coil temperature lower than set temperature, judges air-conditioning frosting, needs
To enter defrosting.
In actual use, there are following situations for air-conditioning: when space is excessive, locating space heat insulating ability is poor, room
Interior environment temperature is not achieved set temperature, air-conditioning can under a certain environment temperature lower than set temperature continuous service.At this point, if
Air conditioner indoor unit air inlet or heat exchanger then will lead to that inside pressure is higher, and indoor coil pipe is bigger than normal there are dirty stifled, air-conditioning meeting
It is protected into high temperature-proof, compressor frequency reducing is until indoor coil pipe is lower than high temperature-proof frequency reducing temperature；But since environment temperature reaches
Less than set temperature, the target frequency of compressor can be still gradually increased, and indoor coil pipe is caused to increase, and be again introduced into high temperature-proof
Protection constantly repeats, the fluctuation being frequent.Due in air conditioning chamber, outdoor unit pass through connecting tube connect, indoor coil pipe wave
It is dynamic to also result in outdoor pipe coil temperature and also fluctuate accordingly, at this point, if outdoor unit frosting is thicker, but due to indoor coil temperature
Influence of the degree fluctuation to outdoor coil temperature, is unable to reach into defrosting condition, can not defrost.Actual test discovery,
Inside 27(dry-bulb temperature)/- (wet-bulb temperature), and outside -7(dry-bulb temperature)/- 8(wet-bulb temperature) operating condition, high wind operation, half is stifled
Interior machine two sides air inlet, outdoor coil temperature start frequent fluctuation after running 5min, and outdoor coil temperature exists after running 30min
Temperature is minimized to during raised again, starts the case where lower than set temperature occur, in subsequent operational process, even
It is continuous gradually stable lower than the time of set temperature, but it is (such as: 2min) low to be unable to reach defrosting continuous detection a period of time always
In the requirement of set temperature, although at this point, outer machine frosting is thicker, not can enter defrosting.
Summary of the invention
Defrosting control method when high temperature-proof protection frequent the purpose of the present invention is to provide a kind of air-conditioning heating, solves
When the existing frequent high temperature-proof of air-conditioning heating is protected, in the case where outdoor heat exchanger frosting, the technical issues of defrosting can not be entered.
In order to solve the above technical problems, the present invention is achieved by the following scheme:
Defrosting control method when a kind of frequent high temperature-proof protection of air-conditioning heating, described method includes following steps:
(1) air-conditioning heating is run, and detects indoor coil pipe Tk;
(2) if in a period of time taInterior continuous n times detect Tk=THigh temperature-proof frequency reducing, enter step (3)；
(3) outdoor environment temperature T is detectedOuter ring, outdoor coil temperature Te, calculate outdoor coil temperature Te≤TSettingIt is accumulative when
Between tbIf tb≥tSetting, then enter defrosting.
Enter the accuracy of defrosting Rule of judgment, the outdoor environment temperature T in order to further enhance air-conditioningOuter ringAt least set
It is set to two temperature ranges, outdoor environment temperature TOuter ringT when in a temperature rangeSettingAnd tSettingFor fixed value, TSettingAnd tSetting
According to TOuter ringThe variation of locating temperature range and change.
Further, the TOuter ringT when positioned at the high temperature range of temperatureSettingGreater than TOuter ringThe humidity province low positioned at temperature
Between when TSetting.The TOuter ringT when positioned at the high temperature range of temperatureSettingLess than or equal to TOuter ringThe temperature range low positioned at temperature
When tSetting。
Preferably, the outdoor environment temperature is divided into 4 temperature ranges.
The design of defrosting control method when high temperature-proof protection frequent based on above-mentioned air-conditioning heating, the invention also provides one
Kind control system, comprising:
Timing unit, for recording time ta、tb, and it is transmitted to control unit；
Temperature detecting unit, for detecting indoor coil pipe Tk, outdoor environment temperature TOuter ring, outdoor coil temperature Te, and
It is transmitted to control unit；
Control unit, in time taInterior continuous n times detect Tk=THigh temperature-proof frequency reducingAfterwards, outdoor coil temperature Te≤TSetting's
Cumulative time tb≥tSettingWhen, control air-conditioning enters defrosting.
Compared with prior art, the advantages and positive effects of the present invention are: air-conditioning of the present invention is in heating operation, detection is empty
It adjusts and whether is in frequent high temperature-proof guard mode, if so, detection outdoor environment temperature TOuter ring, outdoor coil temperature Te, pass through room
Outer coil temperature Te≤TSettingCumulative time tbWith setting time tSettingRelationship judge whether enter defrosting, can be avoided air-conditioning
Indoor coil pipe fluctuates the influence to outdoor coil temperature when frequent high temperature-proof guard mode, achievees the purpose that accurately to defrost.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
Fig. 1 is the flow chart of the specific embodiment of the invention.
Fig. 2 is indoor coil pipe and outdoor coil temperature variable condition schematic diagram in the specific embodiment of the invention.
Fig. 3 is the functional block diagram of the specific embodiment of the invention.
Specific embodiment
A specific embodiment of the invention is described in detail with reference to the accompanying drawing.
When air-conditioning heating is run, machine air inlet or heat exchanger will lead to inside pressure there are in situation dirty plugging indoors
Higher, indoor coil pipe is bigger than normal, at this point, air-conditioning, which can enter high temperature-proof, protects stage, i.e. control compressor frequency reducing until indoor
Coil temperature is lower than high temperature-proof frequency reducing temperature.And at this point, if air conditioner indoor unit be in excessive space or thermal insulation property compared with
When the space of difference, there can be the case where set temperature is not achieved in environment temperature always, the target frequency of compressor is made to continue to increase,
Cause indoor coil pipe to increase, is again introduced into the high temperature-proof protection stage, constantly repeats, be frequent high temperature-proof guard mode.
At this point, if outdoor heat exchanger surface temperature in subzero, and be lower than surrounding air dew-point temperature when, the meeting of outdoor heat exchanger surface
There is frosting, influences the heating effect of air-conditioning.However, due in air conditioning chamber, outdoor unit pass through connecting tube connect, indoor coil temperature
Cause outdoor coil temperature also to fluctuate accordingly while degree fluctuation, at this point, if outer machine frosting is thicker, but due to indoor coil
Influence of the temperature fluctuation to outdoor coil temperature, outdoor coil temperature can not be low always in continuous a period of time (such as: 2min)
It in set temperature, is unable to reach into defrosting condition, can not defrost.The present invention is exactly to be directed to changing for above situation progress
Into, when air-conditioning is in and operates normally, defrosted using existing defrosting condition, such as continuous a period of time (such as: 2min) inspection
Outdoor coil temperature is measured lower than set temperature, air-conditioning frosting is judged, into defrosting mode；Frequent high temperature-proof is in air-conditioning to protect
When shield state, using outdoor coil temperature lower than the cumulative time of set temperature judge air-conditioning whether frosting, into defrosting mode,
Preferably to improve the heating effect of air-conditioning.
Specifically, as shown in Figure 1, 2, defrosting control method when the frequent high temperature-proof of the present embodiment air-conditioning heating is protected includes
Following steps:
S1, air-conditioning are opened, into heating operation mode.
S2, detection indoor coil pipe Tk；
If S3, in a period of time taInterior continuous n times detect Tk=THigh temperature-proof frequency reducing, illustrate that air-conditioning is in frequent high temperature-proof protection shape
State, wherein time taThe arbitrary value of 25-35min, preferably 30min, n are at least 3.
S4, detection outdoor environment temperature TOuter ring, outdoor coil temperature Te, calculate outdoor coil temperature Te≤TSettingIt is accumulative when
Between tb。
If S5, tb≥tSetting, enter step S6.
S6, into defrosting.
Wherein, outdoor environment temperature TOuter ringSet at least to two temperature ranges, outdoor environment temperature TOuter ringIn a temperature
Spend T when sectionSettingAnd tSettingFor fixed value, TSettingAnd tSettingAccording to TOuter ringThe variation of locating temperature range and change.TOuter ringPositioned at temperature
Spend T when high temperature rangeSettingGreater than TOuter ringT when positioned at the low temperature range of temperatureSetting。TOuter ringThe humidity province high positioned at temperature
Between when tSettingLess than or equal to TOuter ringT when positioned at the low temperature range of temperatureSetting。
Outdoor environment temperature is divided into 4 temperature ranges by the present embodiment:
TOuter ring≥TOuter ring 1DEG C, TSetting= TSetting 1DEG C, tSetting= tSetting 1min；
TOuter ring 2℃≤TOuter ring< TOuter ring 1DEG C, TSetting= TSetting 2DEG C, tSetting= tSetting 2min；
TOuter ring 3℃≤TOuter ring< TOuter ring 2DEG C, TSetting= TSetting 3DEG C, tSetting= tSetting 3min；
TOuter ring< TOuter ring 3DEG C, TSetting= TSetting 4DEG C, tSetting= tSetting 4min。
Wherein, TSetting 1> TSetting 2> TSetting 3> TSetting 4, tSetting 1< tSetting 2< tSetting 3=tSetting 4。
Preferably,
TOuter ring>=-1 DEG C, TSetting=-5 DEG C, tSetting=7min；
-5℃≤TOuter ring< -1 DEG C, TSetting=-10 DEG C, tSetting=10min；
-7℃≤TOuter ring< -5 DEG C, TSetting=-13 DEG C, tSetting=12min；
TOuter ring< -7 DEG C, TSetting=-15 DEG C, tSetting=12min。
The design of defrosting control method when high temperature-proof protection frequent based on above-mentioned air-conditioning heating, the present embodiment also proposed
Defrosting control system when a kind of frequent high temperature-proof protection of air-conditioning heating, including timing unit, temperature detecting unit and control
Unit.The temperature parameter and preset condition of time parameter, temperature detecting unit detection that control unit is recorded according to timing unit
It is compared, when meeting preset condition, control air-conditioning enters defrosting mode.
Specifically, as shown in figure 3, defrosting control system when the frequent high temperature-proof of the present embodiment air-conditioning heating is protected includes:
Timing unit, for recording time ta、tb, and it is transmitted to control unit；
Temperature detecting unit, including the temperature sensor being installed on indoor heat exchanger coil pipe, for detecting indoor coil
Temperature Tk；It is installed on outdoor outdoor environment temperature sensor, for detecting outdoor environment temperature TOuter ring；It is installed on outdoor heat exchange
Temperature sensor on device coil pipe, for detecting outdoor coil temperature Te, and it is transmitted to control unit；
Control unit, for receiving the clock signal of timing unit transmission, the temperature signal of temperature detecting unit detection.?
Time taInterior continuous n times detect Tk=THigh temperature-proof frequency reducingAfterwards, as outdoor coil temperature Te≤TSettingCumulative time tb≥tSettingWhen, control
Air-conditioning processed enters defrosting.
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 (4)
- Defrosting control method when 1. a kind of frequent high temperature-proof of air-conditioning heating is protected, which is characterized in that the method includes as follows Step:(1) air-conditioning heating is run, and detects indoor coil pipe Tk;(2) if in a period of time taInterior continuous n times detect Tk=THigh temperature-proof frequency reducing, into (3)；(3) outdoor environment temperature T is detectedOuter ring, outdoor coil temperature Te, calculate outdoor coil temperature Te≤TSettingCumulative time tb, If tb≥tSetting, then enter defrosting；The outdoor environment temperature TOuter ringSet at least to two temperature ranges, outdoor environment temperature TOuter ringIn a temperature range When TSettingAnd tSettingFor fixed value, TSettingAnd tSettingAccording to TOuter ringThe variation of locating temperature range and change.
- Defrosting control method when 2. the frequent high temperature-proof of air-conditioning heating according to claim 1 is protected, which is characterized in that institute State TOuter ringT when positioned at the high temperature range of temperatureSettingGreater than TOuter ringT when positioned at the low temperature range of temperatureSetting。
- Defrosting control method when 3. the frequent high temperature-proof of air-conditioning heating according to claim 1 is protected, which is characterized in that institute State TOuter ringT when positioned at the high temperature range of temperatureSettingLess than or equal to TOuter ringT when positioned at the low temperature range of temperatureSetting。
- Defrosting control method when 4. the frequent high temperature-proof of air-conditioning heating according to claim 1 is protected, which is characterized in that institute It states outdoor environment temperature and is divided into 4 temperature ranges.
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