CN109210698A - A kind of control method of air-conditioning freeze protection - Google Patents
A kind of control method of air-conditioning freeze protection Download PDFInfo
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- CN109210698A CN109210698A CN201811052858.7A CN201811052858A CN109210698A CN 109210698 A CN109210698 A CN 109210698A CN 201811052858 A CN201811052858 A CN 201811052858A CN 109210698 A CN109210698 A CN 109210698A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004378 air conditioning Methods 0.000 title claims abstract description 14
- 230000008676 import Effects 0.000 claims abstract description 56
- 230000007423 decrease Effects 0.000 claims description 8
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000001704 evaporation Methods 0.000 abstract description 13
- 210000005239 tubule Anatomy 0.000 abstract description 6
- 239000002826 coolant Substances 0.000 abstract description 4
- 108010053481 Antifreeze Proteins Proteins 0.000 abstract description 3
- 230000002528 anti-freeze Effects 0.000 abstract description 3
- 230000007812 deficiency Effects 0.000 abstract description 3
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- 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
- F24F11/43—Defrosting; Preventing freezing of indoor units
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of control methods of air-conditioning freeze protection, belong to air-conditioner field, when air conditioner freezes or dehumidify operation, obtain the temperature value at indoor set heat exchanger import and export；It is compared according to the absolute difference of temperature value at import and export with the first temperature preset value, and press frequency is controlled according to comparison result；Then it is compared according to the absolute difference of temperature value at import and export with second temperature preset value, frozen region is judged according to comparison result and starts corresponding freeze protection mechanism.The present invention passes through temperature difference absolute value at heat exchanger for air-conditioner indoor machine import and export two and temperature difference positive and negative values; both can clearly determine to freeze because of the tubule side that excessively throttling or coolant quantity deficiency cause the reduction of evaporating pressure and evaporating temperature to generate; it can clearly determine to freeze because of the extra heavy pipe side that pipeline flow dividing is bad or the larger crushing of flow passage structure deformation bring generates again; and by preset temperature and preset time, anti-freeze protection is targetedly carried out respectively.
Description
Technical field
The invention belongs to air-conditioner fields, more particularly to a kind of control method of air-conditioning freeze protection.
Background technique
When air conditioner refrigeration or dehumidifying operation, the heat exchanger of indoor unit is in the lower state of temperature always, it is easy to produce
Raw freezeout, and then air conditioner refrigeration effect is influenced, keep its refrigerating capacity more and more weaker.Therefore, freeze or dehumidify in air conditioner
When operation, therefore, to assure that the indoor set heat exchanger of air conditioner is not in freeze.
In order to which the freezeout to indoor unit coil pipe is monitored, existing air conditioner usually all can be indoors on the coil pipe of machine
Mounting temperature sensor, air conditioner to pass through the coil temperature of indoor unit to judge indoor unit coil pipe freezes situation,
So that when freezeout occurs in indoor unit coil pipe, air conditioner can in time be handled icing.
But there is monitoring limitation in above-mentioned existing monitoring method, first is that the accuracy of this monitoring method needs to rely on
In the tapping condition of heat exchanger, i.e., when the tapping condition of indoor set heat exchanger is bad, only relies on and be provided with temperature sensor
What one branch was difficult to the entire indoor unit coil pipe of accurate judgement freezes situation；Second is that after freezing to appear in coil pipe set-point
Position when (extra heavy pipe end), can not also monitor indoor set heat exchanger in time freezes situation.It follows that air conditioner only relies on
Inner coil pipe temperature is difficult effectively to judge the bulk freezing situation of indoor unit；Therefore, air conditioner also just can not be to indoor unit
Icing is handled in time, then seriously affects the heat exchange efficiency of air conditioner, so as to cause user experience decline.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide one kind can be to interior
The control method for the air-conditioning freeze protection that the bulk freezing situation of machine is effectively judged.
To achieve the above object, it the present invention provides a kind of control method of air-conditioning freeze protection, sequentially includes the following steps:
A1, the temperature value when air conditioner freezes or dehumidifying is run, at acquisition indoor set heat exchanger import and export；
A2, it is compared according to the absolute difference of temperature value at the import and export with the first temperature preset value, and according to
Comparison result controls press frequency；
A3, be compared according to the absolute difference of temperature value at the import and export with second temperature preset value, according to than
Relatively result judges frozen region and starts corresponding freeze protection mechanism；
A4, it is compared according to the absolute difference of temperature value at the import and export with third temperature preset value, and according to
Comparison result exits freeze protection mechanism.
Preferably, the step A2 is sequentially included the following steps:
Step 1: it is default continuously to judge whether the absolute difference of temperature value at import and export described in n times is greater than the first temperature
Value；When the continuous n times of absolute difference of the import and export temperature value are greater than the first temperature preset value, press frequency is according to setting
Constant speed rate continues to decline；Otherwise press keeps current frequency operation；
Step 2: judging the absolute difference of the import and export temperature value whether less than the first temperature preset value, when described
When the absolute difference of import and export temperature value is less than the first temperature preset value, press keeps current frequency operation；Otherwise press frequency
Rate continues to continue to decline according to setting rate；
Step 3: judge the absolute difference of the import and export temperature value it is whether lower than the first temperature preset value 2 DEG C and with
On；When the absolute difference of the import and export temperature value is than low 2 DEG C of the first temperature preset value or more, press is according to setting
Then running frequency of the rate recovery into step 1 before frequency reducing performs the next step rapid；Otherwise it directly performs the next step rapid.
Preferably, the step A3 is sequentially included the following steps:
Judge the absolute difference of the import and export temperature value whether less than the second preset value and the duration reaches B；
When the absolute difference of the import and export temperature value is less than the second preset value and the duration reaches B, judge
Existing freezeout is inlet side or outlet side and starts corresponding freeze protection mechanism；Otherwise A2 is returned to step.
Preferably, when the import and export temperature value absolute difference is less than the second preset value and the duration reaches B
When, if inlet temperature is less than outlet temperature, inlet side freezes, and starts inlet side freeze protection mechanism；
When the absolute difference of the import and export temperature value is less than the second preset value and the duration reaches B, if import
Temperature is greater than outlet temperature, then outlet side freezes, and starts outlet side freeze protection mechanism；
Preferably, the inlet side freeze protection mechanism are as follows: open electric expansion valve to default aperture, press frequency is reduced to
Predeterminated frequency operation；Inlet side freeze protection mechanism runs the t1 time.
Preferably, the outlet side freeze protection mechanism are as follows: press is out of service, is handled with room temperature wind progress ice；Out
Mouth side freeze protection mechanism runs the t2 time.
Preferably, the step A4 is sequentially included the following steps:
Judge whether the absolute difference of the import and export temperature value is less than third preset value；When the import and export temperature
When the absolute difference of value is less than third preset value, freeze protection mechanism, press starting are exited；Otherwise step A4 is continued to execute,
Until the absolute difference of the import and export temperature value is less than third preset value.
The beneficial effects of the present invention are: the present invention by temperature difference absolute value at heat exchanger for air-conditioner indoor machine import and export two with
Temperature difference positive and negative values both can clearly determine because excessively throttling or coolant quantity deficiency cause the reduction of evaporating pressure and evaporating temperature to produce
Raw tubule side is freezed, and can clearly be determined because pipeline flow dividing is bad or flow passage structure deforms what the larger crushing of bring generated
Extra heavy pipe side is freezed, and by preset temperature and preset time, targetedly carries out anti-freeze protection respectively.Invention operation letter
It is single, it is easily used to implement, solves the limitation of single coil temperature control monitoring, can clearly freeze producing cause, and can
Anti-freeze measure is targetedly taken respectively.
Detailed description of the invention
Fig. 1 is the flow diagram of the embodiment of the invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
As shown in Figure 1, a kind of control method of air-conditioning freeze protection, sequentially includes the following steps:
A1, the temperature value when air conditioner freezes or dehumidifying is run, at acquisition indoor set heat exchanger import and export；
A2, it is compared according to the absolute difference of temperature value at the import and export with the first temperature preset value, and according to
Comparison result controls press frequency；It is sequentially included the following steps:
Step 1: it is default continuously to judge whether the absolute difference of temperature value at import and export described in n times is greater than the first temperature
Value；When the continuous n times of absolute difference of the import and export temperature value are greater than the first temperature preset value, press frequency is according to setting
Constant speed rate continues to decline；Otherwise press keeps current frequency operation；N is positive integer.
Step 2: judging the absolute difference of the import and export temperature value whether less than the first temperature preset value, when described
When the absolute difference of import and export temperature value is less than the first temperature preset value, press keeps current frequency operation；Otherwise press frequency
Rate continues to continue to decline according to setting rate；
Step 3: judge the absolute difference of the import and export temperature value it is whether lower than the first temperature preset value 2 DEG C and with
On；When the absolute difference of the import and export temperature value is than low 2 DEG C of the first temperature preset value or more, press is according to setting
Then running frequency of the rate recovery into step 1 before frequency reducing executes step A3；Otherwise step A3 is directly executed.
A3, be compared according to the absolute difference of temperature value at the import and export with second temperature preset value, according to than
Relatively result judges frozen region and starts corresponding freeze protection mechanism；It is sequentially included the following steps:
Judge the absolute difference of the import and export temperature value whether less than the second preset value and the duration reaches B；B>
0。
When the import and export temperature value absolute difference less than the second preset value and the import and export temperature value difference
When value absolute value reaches B less than the duration of the second preset value, judge that freezeout occur is inlet side or outlet side
And start corresponding freeze protection mechanism；Otherwise be it is normal, return to step A2.
If inlet temperature is less than outlet temperature (i.e. temperature difference is negative value), inlet side freezes, and starting inlet side freezes
Tie protection mechanism；The Freezing Cause and mechanism are mainly because excessively throttling or coolant quantity is because the reasons such as leakage reduce by two kinds of situations productions
It is raw, cause tubule section after throttling, the evaporating pressure in evaporator section to reduce, the evaporating temperature under its evaporating pressure is caused to reduce,
There is the case where evaporator tubule side is freezed first.
If inlet temperature is greater than outlet temperature (i.e. temperature difference is positive value), outlet side freezes, and starting outlet side freezes
Tie protection mechanism；The Freezing Cause and mechanism be mainly because shunt it is bad caused by a certain group of pipeline evaporating pressure is low causes to freeze,
And because manufacture, external force intervention cause pipeline or elbow to occur caused by Non-smooth surface is bent or deforms, local crushing is excessive for part, causes
The decline of subsequent evaporation pressure, which generates, to be freezed.
Inlet side freeze protection mechanism in the present embodiment are as follows: open electric expansion valve to default aperture, reduce throttling；Together
When, press frequency is reduced to predeterminated frequency and carries out low-frequency operation；Increase evaporating pressure, improves the processing of evaporating temperature progress ice.Into
Mouth side freeze protection mechanism runs t1 time, t1 > 0.
The mechanism of outlet side freeze protection described in the present embodiment are as follows: press is out of service, is handled with room temperature wind progress ice；
Outlet side freeze protection mechanism runs t2 time, t2 > 0.
A4, it is compared according to the absolute difference of temperature value at the import and export with third temperature preset value, and according to
Comparison result exits freeze protection mechanism:
Judge whether the absolute difference of the import and export temperature value is less than third preset value；When the import and export temperature
When the absolute difference of value is less than third preset value, freeze protection mechanism, press starting are exited；Otherwise step A4 is continued to execute,
Until the absolute difference of the import and export temperature value is less than third preset value.
The present invention passes through inlet and outlet by acquisition air conditioner room unit heat exchanger import and export temperature (tubule, extra heavy pipe temperature)
It temperature gap and is compared, both can have clearly been determined because excessively throttling or coolant quantity deficiency lead to evaporating pressure with preset temperature
And the tubule side that the reduction of evaporating temperature generates is freezed, and can clearly be determined because pipeline flow dividing is bad or flow passage structure Zona transformans comes
Larger crushing generate extra heavy pipe side freeze, and the time by reaching preset temperature be arranged, determine whether enter freeze protection
State and end freeze protection state.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (7)
1. a kind of control method of air-conditioning freeze protection, it is characterized in that sequentially including the following steps:
A1, the temperature value when air conditioner freezes or dehumidifying is run, at acquisition indoor set heat exchanger import and export；
A2, it is compared according to the absolute difference of temperature value at the import and export with the first temperature preset value, and according to comparing
As a result press frequency is controlled；
A3, it is compared according to the absolute difference of temperature value at the import and export with second temperature preset value, is tied according to comparing
Fruit judges frozen region and starts corresponding freeze protection mechanism；
A4, it is compared according to the absolute difference of temperature value at the import and export with third temperature preset value, and according to comparing
As a result freeze protection mechanism is exited.
2. a kind of control method of air-conditioning freeze protection as described in claim 1, it is characterized in that: the step A2 presses following step
It is rapid to carry out:
Step 1: continuously judging whether the absolute difference of temperature value at import and export described in n times is greater than the first temperature preset value；
When the continuous n times of absolute difference of the import and export temperature value are greater than the first temperature preset value, press frequency is according to setting speed
Rate continues to decline；Otherwise press keeps current frequency operation；
Step 2: judge the absolute difference of the import and export temperature value whether less than the first temperature preset value, when it is described into,
When the absolute difference of Outlet Temperature value is less than the first temperature preset value, press keeps current frequency operation；Otherwise press frequency
Continue to continue to decline according to setting rate；
Step 3: judging the absolute difference of the import and export temperature value whether than low 2 DEG C of the first temperature preset value or more；
When the absolute difference of the import and export temperature value is than low 2 DEG C of the first temperature preset value or more, press is according to setting rate
Restore the running frequency into step 1 before frequency reducing, then performs the next step rapid；Otherwise it directly performs the next step rapid.
3. a kind of control method of air-conditioning freeze protection as claimed in claim 1 or 2, it is characterized in that: the step A3 press with
Lower step carries out:
Judge the absolute difference of the import and export temperature value whether less than the second preset value and the duration reaches B；
When the absolute difference of the import and export temperature value is less than the second preset value and the duration reaches B, judge to freeze
Knot phenomenon is inlet side or outlet side and starts corresponding freeze protection mechanism；Otherwise A2 is returned to step.
4. a kind of control method of air-conditioning freeze protection as claimed in claim 3, it is characterized in that:
When the absolute difference of the import and export temperature value is less than the second preset value and the duration reaches B, if inlet temperature
Less than outlet temperature, then inlet side freezes, and starts inlet side freeze protection mechanism；
When the absolute difference of the import and export temperature value is less than the second preset value and the duration reaches B, if inlet temperature
Greater than outlet temperature, then outlet side freezes, and starts outlet side freeze protection mechanism.
5. a kind of control method of air-conditioning freeze protection as claimed in claim 4, it is characterized in that: the inlet side freeze protection
Mechanism are as follows: open electric expansion valve to default aperture, press frequency is reduced to predeterminated frequency operation；Inlet side freeze protection mechanism fortune
The row t1 time.
6. a kind of control method of air-conditioning freeze protection as claimed in claim 4, it is characterized in that: the outlet side freeze protection
Mechanism are as follows: press is out of service, is handled with room temperature wind progress ice；Outlet side freeze protection mechanism runs the t2 time.
7. a kind of control method of air-conditioning freeze protection as described in claim 1, it is characterized in that: the step A4 presses following step
It is rapid to carry out:
Judge whether the absolute difference of the import and export temperature value is less than third preset value；When the import and export temperature value
When absolute difference is less than third preset value, freeze protection mechanism, press starting are exited；Otherwise step A4 is continued to execute, until
The absolute difference of the import and export temperature value is less than third preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811052858.7A CN109210698B (en) | 2018-09-10 | 2018-09-10 | Control method for air conditioner freezing protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811052858.7A CN109210698B (en) | 2018-09-10 | 2018-09-10 | Control method for air conditioner freezing protection |
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| Publication Number | Publication Date |
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| CN109210698A true CN109210698A (en) | 2019-01-15 |
| CN109210698B CN109210698B (en) | 2020-11-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260467A (en) * | 2019-05-28 | 2019-09-20 | 青岛海尔空调电子有限公司 | Air conditioner and its anti-freeze protection control method and control device |
| CN110736219A (en) * | 2019-09-20 | 2020-01-31 | 青岛海尔空调器有限总公司 | Anti-freezing control method for indoor unit of air conditioner |
| CN111578413A (en) * | 2020-05-25 | 2020-08-25 | 广东美的制冷设备有限公司 | Radiation air conditioner and heat exchanger protection control method and device |
| CN112577155A (en) * | 2019-09-27 | 2021-03-30 | 广东美的制冷设备有限公司 | Control method of air conditioner, air conditioner and computer readable storage medium |
| CN115654661A (en) * | 2022-08-19 | 2023-01-31 | 珠海格力电器股份有限公司 | Air conditioner anti-freezing control method and air conditioner |
| WO2023015883A1 (en) * | 2021-08-09 | 2023-02-16 | 青岛海尔空调器有限总公司 | Air conditioner control method and apparatus, electronic device, storage medium, and air conditioner |
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| CN112577155A (en) * | 2019-09-27 | 2021-03-30 | 广东美的制冷设备有限公司 | Control method of air conditioner, air conditioner and computer readable storage medium |
| CN111578413A (en) * | 2020-05-25 | 2020-08-25 | 广东美的制冷设备有限公司 | Radiation air conditioner and heat exchanger protection control method and device |
| CN111578413B (en) * | 2020-05-25 | 2021-12-21 | 广东美的制冷设备有限公司 | Radiation air conditioner and heat exchanger protection control method and device |
| WO2023015883A1 (en) * | 2021-08-09 | 2023-02-16 | 青岛海尔空调器有限总公司 | Air conditioner control method and apparatus, electronic device, storage medium, and air conditioner |
| CN115654661A (en) * | 2022-08-19 | 2023-01-31 | 珠海格力电器股份有限公司 | Air conditioner anti-freezing control method and air conditioner |
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Effective date of registration: 20201030 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |