CN107421072B - Air conditioner and high-temperature-resistant control method thereof - Google Patents
Air conditioner and high-temperature-resistant control method thereof Download PDFInfo
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- CN107421072B CN107421072B CN201710637086.2A CN201710637086A CN107421072B CN 107421072 B CN107421072 B CN 107421072B CN 201710637086 A CN201710637086 A CN 201710637086A CN 107421072 B CN107421072 B CN 107421072B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003507 refrigerant Substances 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 23
- 239000002826 coolant Substances 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 9
- 230000002265 prevention Effects 0.000 abstract 3
- 238000010257 thawing Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention relates to an air conditioner and a high temperature prevention control method thereof, wherein a communication branch is arranged between an exhaust port of a compressor and a liquid refrigerant circulation port of an outdoor unit heat exchanger in the air conditioner, an on-off valve is arranged on the communication branch, and a control component can be used for switching on the on-off valve when the temperature of a heat exchange tube of the outdoor unit heat exchanger is judged to be lower than a second preset temperature value after the air conditioner enters a high temperature prevention mode during heating so as to enable gaseous refrigerant at the exhaust port of the compressor to flow to the liquid refrigerant circulation port of the outdoor unit heat exchanger through the communication branch. The air conditioner can directly circulate the high-pressure gaseous refrigerant at the high-pressure side to the low-pressure side before the misdefrosting possibly occurs in the high-temperature prevention period, and quickly reduce the exhaust pressure so as to reduce the temperature of a heat exchange tube of an indoor unit heat exchanger and play a role of preventing high temperature; and the liquid refrigerant at the low-pressure side can be heated by the high-pressure gaseous refrigerant, the temperature of the refrigerant at the air suction port of the compressor is controlled within a proper range, and the phenomenon of mistaken defrosting caused by too low pressure is prevented.
Description
Technical field
The present invention relates to air conditioner technical field more particularly to a kind of air conditioner and its high temperature-proof control methods.
Background technique
Air-cooled ducted air conditioner uses working principle as shown in Figure 1 currently on the market, and side is equipped with indoor unit indoors, and indoor unit includes
Indoor set heat exchanger 5 and indoor fan 6 are equipped with compressor 1, reversal valve 4 and outdoor unit in outside, and outdoor unit includes outdoor unit
Heat exchanger 2 and outdoor fan 3.Orifice union 7 is equipped on access between indoor machine and outdoor unit.
When air conditioner needs to freeze, indoor unit goes out as evaporator, outdoor unit as condenser, indoor set heat exchanger 5
Mouthful low-temp low-pressure gaseous coolant flow through the suction end for entering compressor 1 after reversal valve 4, by the compressed high temperature of compressor 1
High-pressure gaseous refrigerant forms liquid refrigerants after reversal valve 4 is flowed in outdoor unit heat exchanger 2 and exchanged heat, and then passes through the second throttling
71 reducing pressure by regulating flow of element, and returned in indoor set heat exchanger 5 by check valve 73.
When air conditioner needs to heat, reversal valve 4 commutates, and outdoor unit is as evaporator at this time, indoor unit as condenser,
The cut-off of 73 place access of check valve the liquid refrigerants that is formed while passing through concatenated second after the heat exchange of indoor set heat exchanger 5
72 reducing pressure by regulating flow of restricting element 71 and third restricting element, returns again in outdoor unit heat exchanger 2.
Such fixed frequency air conditioner unit under high temperature environment heating operation when, delivery temperature and pressure all can be very high, but unit
It needs to continue working down, it is therefore desirable to carry out high temperature-proof processing.Currently used high temperature-proof method is by stopping outdoor wind
The method of machine 3 reduces the pressure of inspiration(Pi) of compressor 1 to prevent the tube temperature of indoor set heat exchanger 5 excessively high.It finds in practice this
Method will lead to compressor 1 during high temperature-proof and return liquid, and then defrost occurs.But because practical outdoor temperature is very high, unit
It is upper that frosting is not present, therefore this defrost process is referred to as accidentally defrost.
Summary of the invention
The purpose of the present invention is to propose to a kind of air conditioner and its high temperature-proof control methods, and air conditioner can be prevented anti-in heating
Occurs the phenomenon that accidentally defrost during high temperature.
According to an aspect of the invention, it is proposed that a kind of air conditioner, including the heat exchange of compressor, outdoor unit heat exchanger, indoor unit
The liquid refrigerants communication port of device, outdoor fan and control unit, the exhaust outlet of the compressor and the outdoor unit heat exchanger it
Between be equipped with connection branch, connected component road is equipped with on-off valve, and the control unit can be judged in air conditioner heat-production
The heat exchanger tube temperature of the indoor set heat exchanger stops the outdoor fan after being higher than the first preset temperature value, is then judging
The heat exchanger tube temperature of the outdoor unit heat exchanger connects the on-off valve when being lower than the second preset temperature value, so that the compressor
The gaseous coolant of exhaust outlet flows to the liquid refrigerant stream passage port of the outdoor unit heat exchanger by the connection branch.
Further, connected component road be additionally provided with the concatenated first throttle element of the on-off valve, for making
The liquid refrigerant stream passage port of the outdoor unit heat exchanger is circulated to after stating the gaseous coolant decompression of exhaust outlet of compressor.
It further, further include outer machine temperature detection part, the outer machine temperature detection part is located at the outdoor unit and changes
On hot device, for detecting the heat exchanger tube temperature of the outdoor unit heat exchanger.
It further, further include indoor set heat exchanger and interior machine temperature detection part, the interior machine temperature detection part is set
On the indoor set heat exchanger, for detecting the heat exchanger tube temperature of the indoor set heat exchanger.
Further, the control unit further includes temperature judgment module and on-off control module, wherein
The temperature judgment module is used to judge the heat exchanger tube temperature and the described second default temperature of the outdoor unit heat exchanger
The relationship of angle value or third preset temperature value;
The on-off control module is used to judge the heat exchanger tube of the outdoor unit heat exchanger in the temperature judgment module
Temperature connects the on-off valve when being lower than second preset temperature value, and/or judges in the temperature judgment module described
The heat exchanger tube temperature of outdoor unit heat exchanger disconnects the on-off valve when being higher than the third preset temperature value.
Further, the third preset temperature value is higher than second preset temperature value.
Further, the control unit includes temperature judgment module and blower start and stop module, wherein
The temperature judgment module is used to judge the heat exchanger tube temperature and the described first default temperature of the indoor set heat exchanger
The relationship of angle value or the 4th preset temperature value;
The blower start and stop module is used to judge the heat exchanger tube of the indoor set heat exchanger in the temperature judgment module
Temperature stops the outdoor fan when being higher than first preset temperature value, and/or judges institute in the temperature judgment module
It is normal to enter that the outdoor fan is opened when stating the heat exchanger tube temperature of indoor set heat exchanger lower than four preset temperature value
Heating mode.
Further, the 4th preset temperature value is lower than first preset temperature value.
According to another aspect of the invention, it is proposed that a kind of high temperature-proof control method for the various embodiments described above air conditioner,
Include:
In the air conditioner heat-production, the control unit judges whether the heat exchanger tube temperature of indoor set heat exchanger is higher than
One preset temperature value, if it is stops outdoor fan;
Then the control unit judges whether the heat exchanger tube temperature of the outdoor unit heat exchanger is lower than the second preset temperature
Value, if it is connects the on-off valve, so that the gaseous coolant of the exhaust outlet of compressor is circulated by the connection branch
To the liquid refrigerant stream passage port of the outdoor unit heat exchanger, otherwise remain off the on-off valve.
Further, when the control unit judges the heat exchanger tube temperature of indoor set heat exchanger not higher than the first default temperature
When angle value, further includes: the air conditioner is made to keep normal heating mode.
Further, after connecting the on-off valve, further includes:
The control unit judges whether the heat exchanger tube temperature of the outdoor unit heat exchanger is higher than third preset temperature value, such as
Fruit is to disconnect the on-off valve.
Further, further includes:
The control unit judges whether the heat exchanger tube temperature of indoor set heat exchanger is lower than the 4th preset temperature value, if it is
Then start outdoor fan so that the air conditioner switches to normal heating mode.
Further, further includes:
Outer machine temperature detection part detects the heat exchanger tube temperature of the outdoor unit heat exchanger;And/or
Interior machine temperature detection part detects the heat exchanger tube temperature of the indoor set heat exchanger.
Based on the above-mentioned technical proposal, the air conditioner of the embodiment of the present invention, by exhaust outlet of compressor and outdoor unit heat exchange
It is equipped with connection branch between the liquid refrigerants communication port of device, and after entering high temperature-proof mode in air conditioner heat-production, works as outdoor unit
The heat exchanger tube temperature of heat exchanger connects connection branch when being lower than the first preset temperature value, mistake can be likely to occur during high temperature-proof
Before defrost, on high-tension side high-pressure gaseous refrigerant is directly passed to low-pressure side, quickly reduces pressure at expulsion, to reduce indoor unit
The heat exchanger tube temperature of heat exchanger, plays the role of high temperature-proof;And it can also be by high-pressure gaseous refrigerant to the liquid refrigerants of low-pressure side
Heating controls the gaseous coolant temperature of compressor air suction mouth in OK range, prevents because outdoor fan stops for a long time
Operation causes low pressure too low and generates accidentally defrost, avoids the occurrence of high voltage protective and influences user's use, and mitigates high temperature-proof mode
Lower compressor air suction mouth returns liquid, improves the functional reliability and service life of compressor.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of air conditioner in the prior art;
Fig. 2 is the schematic diagram of one embodiment of the air condition of that present invention;
Fig. 3 is the flow diagram of one embodiment of the air condition of that present invention high temperature-proof control method;
Fig. 4 is the flow diagram of another embodiment of the air condition of that present invention high temperature-proof control method.
Description of symbols:
1, compressor;2, outdoor unit heat exchanger;3, outdoor fan;4, reversal valve;5, indoor set heat exchanger;6, indoor wind
Machine;7, orifice union;8, it is connected to branch;71, the second restricting element;72, third restricting element;73, check valve;81, first segment
Fluid element;82, on-off valve.
Specific embodiment
The present invention described further below.In the following paragraphs, the different aspect of embodiment is defined in more detail.So
The various aspects of restriction can be combined with any other one aspect or many aspects, can not be combined unless explicitly stated otherwise.Especially,
It is considered as preferred or advantageous any feature can be considered as preferred or advantageous feature group with other one or more
It closes.
The terms descriptions merely for convenience such as " first " that occurs in the present invention, " second " have same names to distinguish
Different building blocks, be not offered as successively or primary-slave relation.
Air conditioner in the prior art is after outdoor fan 3 stops working air conditioner is made to enter high temperature-proof mode, outdoor unit
Heat exchanger 2 can only be exchanged heat by free convection, not can be carried out forced-convection heat transfer, therefore the heat exchange property of evaporation side becomes
Difference, evaporator evaporation not exclusively, make refrigerant enter the air entry of compressor 1 in the form of gas-liquid mixed.Compressor 1 sucks more
Liquid refrigerants can reduce pressure of inspiration(Pi), to reduce pressure at expulsion indirectly, and then achieve the purpose that high temperature-proof controls.
But if the liquid refrigerants excessive concentration of 1 air entry of compressor sucking, it is too low to will lead to pressure of inspiration(Pi), due to
Outdoor unit corresponds to evaporation side in heating operations, and the heat exchanger tube temperature reflection of outdoor unit heat exchanger is the corresponding saturation of pressure of inspiration(Pi)
Temperature, thus the low corresponding saturation temperature of pressure of inspiration(Pi) will be low, i.e. the heat exchanger tube temperature of outdoor unit heat exchanger is lower than preset value,
At this point, system just will do it defrost processing, but since the operating ambient temperature of air conditioner is higher, the case where frosting is not present,
Also just there is accidentally defrost in high temperature-proof control period.High-temperature work environment can be temperature when spring to summer transition season
Degree, for example, indoor 27 DEG C of dry-bulb temperature, 24 DEG C outdoor.
In order to solve this problem, the invention proposes the air conditioners to the prior art to be improved, as shown in Figure 2
Air conditioner schematic diagram, including compressor 1, indoor unit, outdoor unit, reversal valve 4 and orifice union 7, wherein indoor unit includes interior
Machine heat exchanger 5 and indoor fan 6, outdoor unit includes outdoor unit heat exchanger 2 and outdoor fan 3, in outdoor unit heat exchanger 2 and interior
The access that machine heat exchanger 5 connects is equipped with orifice union 7.
On this basis, the company of being equipped between the exhaust outlet of compressor 1 and the liquid refrigerants communication port of outdoor unit heat exchanger 2
Logical branch 8, connection branch 8 are equipped with on-off valve 82.The liquid refrigerants communication port of outdoor unit heat exchanger 2 can cover following range:
The opening and outdoor unit heat exchanger 2 and orifice union 7 for liquid refrigerants disengaging opened up on outdoor unit heat exchanger 2 itself it
Between any position on pipeline.Preferably, on-off valve 82 is solenoid valve, and the on-off shape of on-off valve 82 can be controlled by control unit
State, correspondingly to control the on off operating mode of connection branch 8.
The air conditioner further includes control unit, such as controller, and control unit can judge during air conditioner heat-production
The heat exchanger tube temperature T of indoor set heat exchanger 5 outIt is interiorHigher than the first preset temperature value T1Afterwards stop outdoor fan 3 so that air conditioner into
Enter high temperature-proof mode, then control unit is in the heat exchanger tube temperature T for judging outdoor unit heat exchanger 2OutsideLower than the second preset temperature
Value T2When connect on-off valve 82 so that the gaseous coolant of 1 exhaust outlet of compressor by be connected to branch 8 flow to outdoor unit heat exchanger
2 liquid refrigerant stream passage port.
Connection branch 8 in the embodiment can at least play the work of following several respects after air conditioner enters high temperature-proof mode
With:
(1) high pressure refrigerant of 1 exhaust outlet of compressor can be directly passed to the low-pressure side of air conditioner, nothing by connection branch 8
Need to make compressor 1 be discharged partial high pressure gaseous coolant successively after reversal valve 4, indoor set heat exchanger 5 and orifice union 7 again
Low-pressure side is reached, influence of the system to the height pressure difference of refrigerant circulating resistance and compressor 1 can be reduced, to quickly reduce exhaust
Pressure, and then reduce the heat exchanger tube temperature T of indoor set heat exchanger 5It is interior, play the role of high temperature-proof.
(2) the high-temperature gas refrigerant of 1 exhaust outlet of compressor is directly passed to the low-pressure side of air conditioner by connection branch 8, can
Low temperature liquid refrigerant heating to low-pressure side, increases the evaporation capacity of the refrigerant in outdoor unit heat exchanger 2, by 1 air entry of compressor
Gaseous coolant temperature control in OK range, effectively prevent because outdoor fan 3 is out of service for a long time to lead to low pressure mistake
It is low and generate accidentally defrost.
(3) it is solving the problems, such as air conditioner after the mistake defrost under high temperature-proof mode, can be avoided air conditioner and high pressure occur
Protection guarantees user's normal use, optimizes user experience.
(4) the high-temperature gas refrigerant of 1 exhaust outlet of compressor is directly passed to the low-pressure side of air conditioner, energy by connection branch 8
It is enough to improve the liquid refrigerant temperature for entering outdoor unit heat exchanger 2, to increase the gaseous state evaporated after outdoor unit heat exchanger 2 exchanges heat
Refrigerant content, with mitigate under high temperature-proof mode mitigate compressor 1 air entry return liquid, improve compressor functional reliability and
Service life.
Further, still referring to FIG. 2, being additionally provided on connection branch 8 and the concatenated first throttle element 81 of on-off valve 82, use
In making the gaseous coolant of 1 exhaust outlet of compressor be circulated to the liquid refrigerants communication port of outdoor unit heat exchanger 2 after reducing pressure by regulating flow
Place.Preferably, first throttle element 81 is capillary or expansion valve.First throttle element 81 can reduce from high-tension side compression
1 exhaust outlet of machine is circulated to the cold medium flux of low-pressure side, to adapt to the liquid refrigerants of compressor 1 exhaust outlet and outdoor unit heat exchanger 2
Height pressure difference between communication port damages compressor 1 with preventing from whole high pressure gas is directly led to low-pressure side.
Outdoor unit may also include outer machine temperature detection part, such as temperature sensing package, and outer machine temperature detection part is located at outdoor unit
On the tube body of heat exchanger 2, for detecting the heat exchanger tube temperature T of outdoor unit heat exchanger 2Outside, TOutsideIt is able to reflect in air conditioner refrigeration
The corresponding saturation temperature of Compressor Discharge Pressure.
Indoor unit may also include interior machine temperature detection part, such as temperature sensing package, and interior machine temperature detection part is located at indoor unit
On the tube body of heat exchanger 5, for detecting the heat exchanger tube temperature T of indoor set heat exchanger 5It is interior, TIt is interiorIt is able to reflect in air conditioner refrigeration
The corresponding saturation temperature of suction pressure of compressor.
The composition of control unit and function are described below.Control unit may include signal receiving module, for connecing
Receive the heat exchanger tube temperature T of the outdoor unit heat exchanger 2 of outer machine temperature detection part detectionOutsideAnd interior machine temperature detection part detection
Indoor set heat exchanger 5 heat exchanger tube temperature TIt is interior。
Further, control unit may also include temperature judgment module and on-off control module.Wherein, temperature judgment module
It is connect with signal receiving module, for judging the heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideWith the second preset temperature value T2Or the
Three preset temperature value T3Relationship.On-off control module is connect with temperature judgment module, for judging in temperature judgment module
The heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideLower than the second preset temperature value T2When connect on-off valve 82, to connect connection branch
8, so that the gaseous coolant of 1 exhaust outlet of compressor be made to be circulated to the liquid refrigerant stream passage port of outdoor unit heat exchanger 2;And/or
Temperature judgment module judges the heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideHigher than third preset temperature value T3When disconnect on-off valve
82, so that air conditioner restores to original high temperature-proof mode, under original high temperature-proof mode, the gaseous state of 1 exhaust outlet of compressor
Refrigerant can only circulate along main circulation loop.
In the embodiment, control unit can pass through the heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideOutdoor unit is obtained in real time
Working condition, accurately to judge to be connected to the opportunity that switches on or off of branch 8, during air conditioner heat-production high temperature-proof and
When avoid the occurrence of accidentally defrost phenomenon, and eliminate accidentally defrost a possibility that after restore again to original high temperature-proof mode.
Preferably, third preset temperature value T3Higher than the second preset temperature value T2.For example, T2=-1 DEG C, T3=2 DEG C.It is such
Set-up mode can make air conditioner steady operation changing in favor of outdoor unit heat exchanger 2 for a period of time after the connection of on-off valve 82
Heat pipe temperature TOutsideA possibility that increasing, eliminating accidentally defrost as far as possible;Meanwhile in TOutside>T3Under conditions of disconnect on-off valve 82 after, also can
Air conditioner steady operation is set to be likely to occur T again afterwards for a period of timeOutside<T2, can be avoided on-off control module and frequently control and lead to
Disconnected valve 82 carries out state switching, improves the functional reliability and service life of on-off valve 82.
Further, control unit may also include blower start and stop module, and blower start and stop module and temperature judgment module connect
It connects.Wherein, temperature judgment module is also used to judge the heat exchanger tube temperature T of indoor set heat exchanger 5It is interiorWith the first preset temperature value T1Or
4th preset temperature value T4Relationship.Blower start and stop module is used to judge changing for indoor set heat exchanger 5 in temperature judgment module
Heat pipe temperature TIt is interiorHigher than the first preset temperature value T1When stop outdoor fan 3 with enter high temperature-proof mode, and/or temperature judge
Module judges the heat exchanger tube temperature T of indoor set heat exchanger 5It is interiorLower than the 4th preset temperature value T4Shi Kaiqi outdoor fan 3 with into
Enter normal heating mode.
In the embodiment, control unit can pass through the heat exchanger tube temperature T of indoor set heat exchanger 5It is interiorIndoor unit is obtained in real time
Working condition, accurately to judge the opportunity switched between high temperature-proof mode and normal heating mode when air conditioner work,
Delivery temperature and pressure are beyond safety value when to prevent air conditioner from running at higher ambient temperatures with heating mode.
Preferably, the 4th preset temperature value T4Less than the first preset temperature value T1.For example, T1=56 DEG C, T4=50 DEG C.Then
The relationship of this four preset temperature values are as follows: T2<T3<T4<T1。
Such set-up mode can make air conditioner steady operation after the entrance high temperature-proof mode out of service of outdoor fan 3
A period of time is to reduce the heat exchanger tube temperature T of indoor set heat exchanger 5It is interior, to prevent air conditioner from high voltage protective occur, in TIt is interior<T4's
Under the conditions of open outdoor fan 3 after, also air conditioner steady operation can be made to be likely to T occur afterwards for a period of timeIt is interior>T1And it needs again
Into high temperature-proof mode, it can be avoided blower start and stop module and frequently control 3 carry out state switching of outdoor fan, improve outdoor fan
3 functional reliability and service life.
In addition, the present invention also provides a kind of high temperature-proof control methods of air conditioner described based on the above embodiment, one
In a schematical embodiment, flow diagram as shown in Figure 3 includes the following steps:
Step 101, in air conditioner heat-production, control unit judges the heat exchanger tube temperature T of indoor set heat exchanger 5It is interiorIt is whether high
In the first preset temperature value T1, if it is (TIt is interior>T1) 102 are thened follow the steps, otherwise (TIt is interior≤T1) execute step 103;
Step 102, control unit stop outdoor fan 3 and work, so that air conditioner enters high temperature-proof operating mode;
Step 103 makes air conditioner keep normal heating mode;
Step 104, after outdoor fan 3 stops working, control unit judges the heat exchanger tube temperature T of outdoor unit heat exchanger 2Outside
Whether the second preset temperature value T is lower than2, if it is (TOutside<T2) 105 are thened follow the steps, otherwise (TOutside≥T2) execute step 106;
Step 105, control unit connect on-off valve 82, so that the gaseous coolant of 1 exhaust outlet of compressor passes through connection branch 8
It is circulated to the liquid refrigerant stream passage port of outdoor unit heat exchanger 2;
Step 106 remains off on-off valve 82, to keep original high temperature-proof mode.
Wherein, step 101 and 104 can be executed by temperature judgment module, and step 102 can be executed by blower start and stop module, step
Rapid 105 can be executed by on-off control module.Air conditioner starting after, can first with normal heating mode operation, step 102 and
103 is all executable when meeting corresponding condition in entire control process.In step 106, under original high temperature-proof mode, room
Outer blower 3 is out of service, the gaseous coolant of 1 exhaust outlet of compressor can only circulate along main circulation loop, i.e. 1 exhaust outlet of compressor
Gaseous coolant can only get to outdoor unit heat exchanger 2 after reversal valve 4, indoor set heat exchanger 5 and orifice union 7.
In this embodiment, temperature judgment module can pass through the heat exchanger tube temperature T of indoor set heat exchanger 5It is interiorRoom is obtained in real time
The working condition of interior machine, with what is switched between high temperature-proof mode and normal heating mode when accurately judging that air conditioner works
Opportunity, so that delivery temperature and pressure are beyond safety when preventing air conditioner from running at higher ambient temperatures with heating mode
Value.
Moreover, control unit can pass through the heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideThe work shape of outdoor unit is obtained in real time
State is likely to occur before accidentally defrost with accurately judging to be connected to the opportunity of the connection of branch 8 during high temperature-proof, directly will be high
The high-pressure gaseous refrigerant of pressure side is passed to low-pressure side, reduces pressure at expulsion, quickly to reduce the heat exchange tube temperature of indoor set heat exchanger
Degree, plays the role of high temperature-proof;And can also be heated by liquid refrigerants of the high-pressure gaseous refrigerant to low-pressure side, by compressor air suction
Mouthful gaseous coolant temperature control in OK range, prevent because outdoor fan for a long time it is out of service cause low pressure too low and
Accidentally defrost is generated, high voltage protective is avoided the occurrence of and influences user's use, and mitigates compressor air suction mouth under high temperature-proof mode and returns liquid,
Improve the functional reliability and service life of compressor.
Flow diagram as shown in Figure 4, in the heat exchanger tube temperature T for judging outdoor unit heat exchanger 2OutsideIt is default lower than second
Temperature value T2, and pass through step 105 and connect after on-off valve 82, the control method further include:
Step 201, control unit judge the heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideWhether third preset temperature value is higher than
T3, if it is (TOutside>T3) 202 are thened follow the steps, otherwise (TOutside≤T3) continue to remain turned on on-off valve 82.
Step 202, control unit disconnect on-off valve 82, to restore to original high temperature-proof mode.
Wherein, step 201 can be executed by temperature judgment module, and step 202 is executed by on-off control module.In the embodiment
In, control unit can pass through the heat exchanger tube temperature T of outdoor unit heat exchanger 2OutsideThe working condition of outdoor unit is obtained, in real time with accurately
Judge to be connected to the opportunity that branch 8 is cut off, to restore again after a possibility that eliminating accidentally defrost to original high temperature-proof mode.
Referring still to flow diagram shown in Fig. 4, during air conditioner is with normal high temperature-proof mode operation, the control
Method further include:
Step 203, control unit judge the heat exchanger tube temperature T of indoor set heat exchanger 5It is interiorWhether the 4th preset temperature value is lower than
T4, if it is (TIt is interior<T4) 204 are thened follow the steps, otherwise (TIt is interior≥T4) continue that the state of the stopping of outdoor fan 3 is kept to make at air-conditioning
In original high temperature-proof mode;
Step 204, control unit start outdoor fan 3, so that air conditioner switches to normal heating mode.
Wherein, step 203 both can be in the heat exchanger tube temperature T for judging outdoor unit heat exchanger 2 by step 104OutsideIt is not less than
Second preset temperature value T2When (TOutside≥T1), keep on-off valve 82 to be in an off state by step 106, so that air-conditioning keeps former
It is executed after some high temperature-proof modes;Can also step 202 disconnect on-off valve 82, with restore to original high temperature-proof mode it
After execute.Step 204 is executed by temperature judgment module, and step 205 is executed by blower start and stop module.
In addition, control method of the invention further include: the heat exchanger tube of outer machine temperature detection part detection outdoor unit heat exchanger 2
Temperature;And/or the heat exchanger tube temperature of interior machine temperature detection part detection indoor set heat exchanger 5.The two steps can needed arbitrarily
It executes at the time of wanting, or is executed in real time in air conditioner heat-production.
In the various embodiments described above, it is preferable that judging outdoor unit heat exchanger 2 or indoor unit in temperature judgment module
After the heat exchanger tube temperature of heat exchanger 5 meets preset condition, preset time, such as 1s are continued to monitor, if in the preset time
It is all satisfied the condition, then is acted by on-off control module control on-off valve 82, or outdoor fan 3 is controlled by blower start and stop module
Change working condition.Such mode can accurately judge outdoor unit heat exchanger 2 or the current temperature shape of indoor set heat exchanger 5
State is reached with the state in heat exchanger and is controlled again on-off valve 82 or outdoor fan 3 after stablizing, prevents frequent change
The phenomenon that state of a control.
A kind of air conditioner provided by the present invention and its high temperature-proof control method are described in detail above.Herein
Applying specific embodiment, principle and implementation of the present invention are described, the explanation of above example is only intended to
It facilitates the understanding of the method and its core concept of the invention.It should be pointed out that for those skilled in the art,
Without departing from the principles of the invention, can be with several improvements and modifications are made to the present invention, these improvement and modification are also fallen
Enter in the protection scope of the claims in the present invention.
Claims (13)
1. a kind of air conditioner, which is characterized in that including compressor (1), outdoor unit heat exchanger (2), indoor set heat exchanger (5), room
Outer blower (3) and control unit, the liquid refrigerants circulation of the exhaust outlet and the outdoor unit heat exchanger (2) of the compressor (1)
Connection branch (8) is equipped between mouthful, the connected component road is equipped with on-off valve (82), and the control unit can be in air conditioner system
Judge to stop the outdoor fan after the heat exchanger tube temperature of the indoor set heat exchanger (5) is higher than the first preset temperature value when hot
(3), it is then connected when the heat exchanger tube temperature for judging the outdoor unit heat exchanger (2) is lower than the second preset temperature value described logical
Disconnected valve (82) pass through the gaseous coolant of the compressor (1) exhaust outlet described before occurring accidentally defrost during high temperature-proof
Connection branch (8) flows directly to the liquid refrigerant stream passage port of the outdoor unit heat exchanger (2).
2. air conditioner according to claim 1, which is characterized in that be additionally provided with and the on-off on the connection branch (8)
The concatenated first throttle element (81) of valve (82), for being circulated to after being depressured the gaseous coolant of the compressor (1) exhaust outlet
The liquid refrigerant stream passage port of the outdoor unit heat exchanger (2).
3. air conditioner according to claim 1, which is characterized in that it further include outer machine temperature detection part, the outer machine temperature
Degree detection part is located on the outdoor unit heat exchanger (2), for detecting the heat exchanger tube temperature of the outdoor unit heat exchanger (2).
4. air conditioner according to claim 1, which is characterized in that further include indoor set heat exchanger (5) and the inspection of interior machine temperature
Component is surveyed, the interior machine temperature detection part is located on the indoor set heat exchanger (5), for detecting the indoor set heat exchanger
(5) heat exchanger tube temperature.
5. air conditioner according to any one of claims 1 to 4, which is characterized in that the control unit further includes temperature judgement
Module and on-off control module, wherein
The temperature judgment module be used for judge the outdoor unit heat exchanger (2) heat exchanger tube temperature and second preset temperature
The relationship of value and/or third preset temperature value;
The on-off control module is used to judge the heat exchange tube temperature of the outdoor unit heat exchanger (2) in the temperature judgment module
It is connected the on-off valve (82) when degree is lower than second preset temperature value, and/or judges institute in the temperature judgment module
The on-off valve (82) are disconnected when stating the heat exchanger tube temperature of outdoor unit heat exchanger (2) higher than the third preset temperature value.
6. air conditioner according to claim 5, which is characterized in that it is default that the third preset temperature value is higher than described second
Temperature value.
7. air conditioner according to any one of claims 1 to 4, which is characterized in that the control unit includes that temperature judges mould
Block and blower start and stop module, wherein
The temperature judgment module be used for judge the indoor set heat exchanger (5) heat exchanger tube temperature and first preset temperature
The relationship of value and/or the 4th preset temperature value;
The blower start and stop module is used to judge the heat exchange tube temperature of the indoor set heat exchanger (5) in the temperature judgment module
Degree stops the outdoor fan (3) when being higher than first preset temperature value, and/or judges institute in the temperature judgment module
Opened when stating the heat exchanger tube temperature of indoor set heat exchanger (5) lower than four preset temperature value outdoor fan (3) with into
Enter normal heating mode.
8. air conditioner according to claim 7, which is characterized in that the 4th preset temperature value is default lower than described first
Temperature value.
9. a kind of high temperature-proof control method for any air conditioner of claim 1~8 characterized by comprising
In the air conditioner heat-production, the control unit judges whether the heat exchanger tube temperature of indoor set heat exchanger (5) is higher than
One preset temperature value if it is stops outdoor fan (3);
Then the control unit judges whether the heat exchanger tube temperature of the outdoor unit heat exchanger (2) is lower than the second preset temperature
Value, if it is connects the on-off valve (82), so that the gaseous coolant of the compressor (1) exhaust outlet passes through the connected component
Road (8) is circulated to the liquid refrigerant stream passage port of the outdoor unit heat exchanger (2), otherwise remains open the on-off valve (82)
State.
10. air conditioner high temperature-proof control method according to claim 9, which is characterized in that when the control unit judges
When the heat exchanger tube temperature of indoor set heat exchanger (5) is not higher than the first preset temperature value out, further includes: keep the air conditioner just
Normal heating mode.
11. air conditioner high temperature-proof control method according to claim 9, which is characterized in that connecting the on-off valve
(82) after, further includes:
The control unit judges whether the heat exchanger tube temperature of the outdoor unit heat exchanger (2) is higher than third preset temperature value, such as
Fruit is to disconnect the on-off valve (82).
12. air conditioner high temperature-proof control method according to claim 9, which is characterized in that further include:
The control unit judges whether the heat exchanger tube temperature of indoor set heat exchanger (5) is lower than the 4th preset temperature value, if it is
Then start outdoor fan (3) so that the air conditioner switches to normal heating mode.
13. air conditioner high temperature-proof control method according to claim 9, which is characterized in that further include:
Outer machine temperature detection part detects the heat exchanger tube temperature of the outdoor unit heat exchanger (2);And/or
Interior machine temperature detection part detects the heat exchanger tube temperature of the indoor set heat exchanger (5).
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CN108375169B (en) * | 2018-02-11 | 2020-05-22 | 广东美的制冷设备有限公司 | Control method and control device, storage medium and mobile air conditioner |
CN108332378B (en) * | 2018-02-11 | 2020-05-19 | 广东美的制冷设备有限公司 | Control method and control device, storage medium and mobile air conditioner |
CN108361909A (en) * | 2018-02-11 | 2018-08-03 | 广东美的制冷设备有限公司 | Control method and control device, storage medium and mobile air-conditioner |
CN109539471B (en) * | 2018-11-05 | 2019-10-18 | 珠海格力电器股份有限公司 | Heating high-temperature-prevention adjusting method and air conditioner |
CN110044005A (en) * | 2019-05-08 | 2019-07-23 | 宁波奥克斯电气股份有限公司 | A kind of air conditioning control method, device and air-conditioning |
CN110793156B (en) * | 2019-11-19 | 2021-12-14 | 宁波奥克斯电气股份有限公司 | Air conditioner heating over-temperature protection control method and device and air conditioner |
CN111503789B (en) * | 2020-05-06 | 2021-07-16 | 宁波奥克斯电气股份有限公司 | High-temperature-prevention control method and device and air conditioner |
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