CN105371531B - The low frequency method for controlling oil return and system of air conditioner - Google Patents
The low frequency method for controlling oil return and system of air conditioner Download PDFInfo
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- CN105371531B CN105371531B CN201510867355.5A CN201510867355A CN105371531B CN 105371531 B CN105371531 B CN 105371531B CN 201510867355 A CN201510867355 A CN 201510867355A CN 105371531 B CN105371531 B CN 105371531B
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- air conditioner
- oil return
- fan
- rotating speed
- expansion valve
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 17
- 108010053481 Antifreeze Proteins Proteins 0.000 claims description 14
- 230000002528 anti-freeze Effects 0.000 claims description 14
- 238000010257 thawing Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 99
- 230000006870 function Effects 0.000 description 44
- 239000003507 refrigerant Substances 0.000 description 16
- 239000010687 lubricating oil Substances 0.000 description 10
- 230000008859 change Effects 0.000 description 8
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000010725 compressor oil Substances 0.000 description 3
- 235000003642 hunger Nutrition 0.000 description 3
- 230000037351 starvation Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003292 diminished effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/16—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/17—Speeds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2104—Temperatures of an indoor room or compartment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides a kind of the low frequency method for controlling oil return and system of air conditioner.Wherein method includes：Detect running frequency, suction superheat, indoor environment temperature and the outdoor environment temperature of compressor；When the running frequency for detecting compressor is running preset time in the case of less than default oil return frequency, air conditioner enters oil return pattern, according to the initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan in indoor environment temperature and outdoor environment temperature selection air conditioner, and the aperture for adjusting electric expansion valve is initial opening, the rotating speed for adjusting outdoor fan is initial speed, and the rotating speed for adjusting indoor fan is initial speed；According to aperture, the rotating speed of outdoor fan and the rotating speed of indoor fan of the suction superheat regulation electric expansion valve detected.It reaches the effect of oil return using pipeline pressure difference, in the case where not influenceing the refrigeration capacity requirement of low-frequency operation and operational reliability, overcomes the various unfavorable factors that traditional raising frequency spill strip comes.
Description
Technical field
The present invention relates to air-conditioner field, more particularly to the low frequency method for controlling oil return and system of a kind of air conditioner.
Background technology
Traditional air conditioner, when compressor long-play is in relatively low frequency, the refrigerant in system is because of system pressure
Power is low and makes the flow velocity step-down of refrigerant, causes the lubricating oil taken out of by refrigerant normally can not take back compressor by refrigerant,
If lubricating oil is carried over and can not return compressor normal through the tape loop of refrigerant for a long time, it is easy to cause compressor
Abrasion or burn.
In order to solve this problem, the method taken at present is that rear raising frequency carries out oil return to compressor low-frequency operation for a period of time
Control so that the lubricating oil being trapped in outside compressor take back or compressor cavity on the grease pump of compression motor spindle oil sump with
Have the function that lubrication.But air conditioner raising frequency oil return under low-frequency operation can break the stable state of environment, cause in room
Temperature change, influences user's usage comfort, and room temperature change easily causes temperature spot when reaching temperature spot stop condition
The phenomenon of shutdown, cause frequently startup-shutdown, and frequently startup-shutdown to have little time to form stable high speed gas in muffler
Stream, lubricating oil can not take back compressor by refrigerant in time, be unfavorable for oil return, and the frequently raising frequency oil return of air conditioner also results in
Unnecessary electricity wastes, and reduces the utilization ratio and performance of air conditioner.
The content of the invention
In consideration of it, providing the low frequency method for controlling oil return and system of a kind of air conditioner, air conditioner is enabled to not rise rate
In the case of can also be normally carried out oil return.
To reach goal of the invention, there is provided a kind of low frequency method for controlling oil return of air conditioner, methods described include：
Detect the indoor environment temperature of the running frequency of compressor, suction superheat and the air conditioner in air conditioner
And outdoor environment temperature；
When the running frequency for detecting the compressor is running preset time in the case of less than default oil return frequency,
The air conditioner enters oil return pattern, is selected according to the indoor environment temperature and the outdoor environment temperature in the air conditioner
The initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan, and adjust electric expansion valve
Aperture be the electric expansion valve initial opening, adjust outdoor fan rotating speed be the outdoor fan initial speed,
The rotating speed for adjusting indoor fan is the initial speed of the indoor fan；
According to the aperture of the suction superheat regulation electric expansion valve detected, the rotating speed of the outdoor fan
With the rotating speed of the indoor fan.
In one of the embodiments, the air conditioner enters oil return pattern, according to the indoor environment temperature and described
The initial opening of electric expansion valve in outdoor environment temperature selection air conditioner, the initial speed of outdoor fan and indoor fan just
Beginning rotating speed, and the aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, the rotating speed for adjusting outdoor fan is
The initial speed of the outdoor fan, adjust indoor fan rotating speed be the indoor fan initial speed the step of include：
The default aperture model of the electric expansion valve is determined according to the indoor environment temperature and the outdoor environment temperature
Enclose, the preset rotation speed scope of the outdoor fan and the preset rotation speed scope of the indoor fan；
The initial opening of the electric expansion valve is selected in the default open range of the electric expansion valve, in the room
The initial speed of the outdoor fan is selected in the range of the preset rotation speed of outer blower fan, in the preset rotation speed scope of the indoor fan
The initial speed of the interior selection indoor fan；
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is institute
The initial speed of outdoor fan is stated, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan.
In one of the embodiments, the suction superheat that the basis detects adjusts the electric expansion valve
The step of rotating speed of aperture, the rotating speed of the outdoor fan and the indoor fan, includes：
When detecting that the suction superheat reaches the first preset limit value, the rotating speed of the indoor fan is controlled to stop
Only, and the outdoor fan is controlled to be run by existing rotating speed；
When detecting that the suction superheat reaches the second preset limit value, the rotating speed of the outdoor fan is controlled to stop
Only, and the indoor fan is controlled to be run by existing rotating speed.
In one of the embodiments, if the air conditioner is run in cooling mode, after the oil return pattern is entered,
Shield the anti-freeze function of the air conditioner and reach the function of being shut down during default cryogenic temperature；
If the air conditioner operation is in a heating mode, after the oil return pattern is entered, the change of the air conditioner is shielded
White function and the function of being shut down when reaching default heating temperature.
In one of the embodiments, the suction superheat detected in the basis adjusts the electric expansion valve
Aperture, the outdoor fan rotating speed and the indoor fan rotating speed the step of after include：
Detecting that the suction superheat reaches default disengaging value or the air conditioner under the oil return pattern and run
After special time, oil return pattern is exited, completes oil return；
If the air conditioner operation is in cooling mode, after oil return is completed, recover the anti-freeze function of the air conditioner
With the function of being shut down when reaching default cryogenic temperature；
If air conditioner operation is in a heating mode, after oil return is completed, recover the defrosting function of the air conditioner with
Reach the function of being shut down during default heating temperature.
The present invention also provides a kind of low frequency oil return control system of air conditioner, and the system includes：
Detection module, for detecting the running frequency of compressor in air conditioner, suction superheat and the air conditioner
Indoor environment temperature and outdoor environment temperature；
Oil return module, for being transported when the running frequency for detecting the compressor in the case of less than default oil return frequency
During row preset time, the air conditioner enters oil return pattern, is selected according to the indoor environment temperature and the outdoor environment temperature
The initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan in the air conditioner is selected, and
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is the outdoor wind
The initial speed of machine, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan；
Adjustment module, for adjusting the aperture, described of the electric expansion valve according to the suction superheat that detects
The rotating speed of the rotating speed of outdoor fan and the indoor fan.
In one of the embodiments, the oil return module includes：
Determining unit, for determining the electric expansion valve according to the indoor environment temperature and the outdoor environment temperature
Default open range, the preset rotation speed scope of the outdoor fan and the preset rotation speed scope of the indoor fan；
Selecting unit, the initial of the electric expansion valve is selected to open in the default open range of the electric expansion valve
Degree, the initial speed of the outdoor fan is selected in the range of the preset rotation speed of the outdoor fan, in the indoor fan
The initial speed of the indoor fan is selected in the range of preset rotation speed；
Adjustment unit, the aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, outside regulation room
The rotating speed of blower fan is the initial speed of the outdoor fan, and the rotating speed for adjusting indoor fan turns for the initial of the indoor fan
Speed.
In one of the embodiments, the adjustment module includes：
First control unit, for when detecting that the suction superheat reaches the first preset limit value, described in control
The rotating speed of indoor fan stops, and controls the outdoor fan to be run by existing rotating speed；
Second control unit, for when detecting that the suction superheat reaches the second preset limit value, described in control
The rotating speed of outdoor fan stops, and controls the indoor fan to be run by existing rotating speed.
In one of the embodiments, in addition to：
First shroud module, if for air conditioner operation in cooling mode, after the oil return pattern is entered, screen
State the anti-freeze function of air conditioner and reach the function of being shut down during default cryogenic temperature in covert；
Secondary shielding module, if for air conditioner operation in a heating mode, after the oil return pattern is entered, screen
State the defrosting function of air conditioner and reach the function of being shut down during default heating temperature in covert.
In one of the embodiments, in addition to：
Module is exited in oil return, for detecting that the suction superheat reaches default disengaging value or the air conditioner in institute
State after running special time under oil return pattern, exit oil return pattern, complete oil return；
First recovery module, if for air conditioner operation in cooling mode, after oil return is completed, recovering the sky
Adjust the anti-freeze function of device and reach the function of being shut down during default cryogenic temperature；
Second recovery module, if for air conditioner operation in a heating mode, after oil return is completed, recovering the sky
Adjust the defrosting function of device and reach the function of being shut down during default heating temperature.
Beneficial effects of the present invention include：
The low frequency method for controlling oil return and system of above-mentioned air conditioner, there is no raising frequency in compressor and not influence air conditioner reliable
In the case of operation, the effect of oil return is reached using pipeline pressure difference, what is overcome due to frequent raising frequency oil return and occur frequently opens
The technical problem of shutdown, the situation of compressor oil starvation caused by avoiding frequent startup-shutdown, and will not be into temperature change in room
The uncomfortable situation of caused use, meanwhile, because compressor does not have raising frequency oil return, caused by compressor raising frequency is not present
Unnecessary electricity wastes, and greatly reduces power consumption, improves air-conditioning utilization ratio.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the low frequency method for controlling oil return of the air conditioner in one embodiment；
Fig. 2 is the structural representation of the low frequency oil return control system of the air conditioner in one embodiment.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair
The low frequency method for controlling oil return and system of air conditioner of the present invention are further elaborated.It is it should be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
In one embodiment, as shown in Figure 1, there is provided a kind of low frequency method for controlling oil return of air conditioner, this method bag
Include：
S100, detect the indoor environment of the running frequency of compressor, suction superheat and the air conditioner in air conditioner
Temperature and outdoor environment temperature.
S200, when the running frequency for detecting compressor runs preset time in the case of less than default oil return frequency
When, air conditioner enters oil return pattern, according to electric expansion valve in indoor environment temperature and outdoor environment temperature selection air conditioner
Initial opening KInitiallyB, the initial speed V of outdoor fanIt is initial outerWith the initial speed V of indoor fanIn initial, and adjust electric expansion valve
Aperture be electric expansion valve initial opening KInitiallyB, the rotating speed for adjusting outdoor fan is the initial speed V of outdoor fanIt is initial outer,
The rotating speed for adjusting indoor fan is the initial speed V of indoor fanIn initial。
S300, the aperture of electric expansion valve, the rotating speed of outdoor fan and interior are adjusted according to the suction superheat detected
The rotating speed of blower fan.
In the present embodiment, when compressor is less than default oil return frequency FOil returnPreset time T is run under (such as 20Hz)1(such as
When 1h), air conditioner enters oil return pattern, if not entering oil return pattern, air conditioner be possible to can because lack lubricating oil and by
Abrasion is even burnt out.But used in the present embodiment be not it is traditional oil return is haveed the function that by compressor raising frequency, but
The initial opening K of suitable electric expansion valve is selected by the outdoor environment temperature and indoor environment temperature of detectionInitiallyB, it is outdoor
The initial speed V of blower fanIt is initial outerWith the initial speed V of indoor fanIn initial, to ensure to have in air conditioner certain pipeline pressure difference (pressure
The pressure differential of contracting machine exhaust end and suction end), have the function that oil return using pipeline pressure difference.Indoor environment temperature and outdoor environment
Temperature has a certain impact to the system pressure of air conditioner, so in the initial opening K of selection electric expansion valveInitiallyB, outdoor wind
The initial speed V of machineIt is initial outerWith the initial speed V of indoor fanIn initialWhen taken into full account ambient temperature.For example, air conditioner
When operating in refrigeration mode, if outdoor environment temperature is relatively low, condenser is more easy to be exchanged heat with outdoor environment, therefore condenser
The system pressure of side is small when environment temperature is high than outdoor；If indoor environment temperature is higher, evaporator is more easy to and outdoor environment
Exchanged heat, the system pressure of vaporizer side is larger when low compared with indoor environment temperature.Such as：If air conditioner operates in refrigeration mode
Under, in order that air conditioner just has certain pipeline pressure difference when starting oil return, select less outdoor fan initial speed (cold
The external heat exchange of condenser is small) and less indoor fan initial speed (the external heat exchange of evaporator is small), simultaneous selection is larger
Electric expansion valve initial opening, and make the aperture of the electric expansion valve of air conditioner for the initial opening K of above-mentioned electric expansion valveInitially
B, outdoor fan rotating speed are the initial speed V of above-mentioned outdoor fanIt is initial outer, indoor fan rotating speed is that the initial of above-mentioned indoor fan turns
Fast VIn initialSo that air-conditioning system just has certain pipeline pressure difference when entering oil return pattern, and pipeline pressure difference causes refrigerant to have
Certain flow velocity, lubricating oil can be driven to return to compressor.
In the oil return running of reality, the suction superheat of compressor is changing all the time, is adjusted according to suction superheat
Save aperture, the rotating speed of outdoor fan and the rotating speed of indoor fan of electric expansion valve.When air conditioner operates in refrigeration mode, if
Suction superheat becomes big, then adjusts electric expansion valve and become big, and indoor fan rotating speed reduces, so that the drop of suction superheat appropriateness
It is low, avoid shutting down because of compressor coil temperature protection switch action caused by suction superheat is excessive, it is now, empty to ensure
The pipeline pressure difference in device is adjusted to have the function that oil return, the rotating speed of outdoor fan keeps constant；If suction superheat diminishes, adjust
Electric expansion valve diminishes, the increase of indoor fan rotating speed so that suction superheat moderately raises, avoid because suction superheat is too small and
Cause compressor hydraulic compression and damage rotor, now, to ensure that the pipeline pressure difference in air conditioner has the function that oil return, outdoor wind
The rotating speed of machine keeps constant or diminished.When air conditioner operates in heating mode, if suction superheat becomes big, electronic expansion is adjusted
Valve becomes big, and outdoor fan rotating speed diminishes, so that the reduction of suction superheat appropriateness, is avoided caused by because suction superheat is excessive
Compressor coil temperature protection switch is acted and shut down, now, to ensure that the pipeline pressure difference in air conditioner has the function that oil return,
The rotating speed of outdoor fan keeps constant；If suction superheat diminishes, adjustment electric expansion valve diminishes, and outdoor fan rotating speed increases
Greatly, so that suction superheat moderately raises, avoid causing compressor hydraulic compression because suction superheat is too small and damaging rotor, this
When, to ensure that the pipeline pressure difference in air conditioner has the function that oil return, the rotating speed of indoor fan keeps constant or diminished.
The low frequency method for controlling oil return of air conditioner in the present embodiment, in the compressor not in the case of raising frequency of air conditioner,
Refrigerant liquid is changed by the rotating speed of the aperture for the electric expansion valve for adjusting air conditioner, the rotating speed of outdoor fan and indoor fan
State ratio, the pressure of liquid refrigerant in air conditioner is improved, and then change the pressure differential of exhaust outlet of compressor and air entry, so as to
Make refrigerant that there is certain flow velocity, the lubricating oil outside air-conditioning system inner compressor, which is taken back compressor, to be lubricated, and is pressed
The pressure differential of contracting machine exhaust outlet and air entry can moisten compressor cavity on the grease pump in compression motor spindle oil sump
It is sliding.
In the embodiment, air conditioner carries out oil return, the cold need in the case where meeting air conditioner low-frequency operation using pipeline pressure difference
Ask, while not influenceing air conditioner reliability of operation, overcome the frequent startup-shutdown that occurs due to frequent raising frequency oil return
Technical problem, the situation of compressor oil starvation caused by avoiding frequent startup-shutdown, and due to not frequent startup-shutdown, therefore will not
Cause to use uncomfortable situation in room caused by temperature change, meanwhile, because compressor does not have raising frequency oil return, do not deposit
Unnecessary electricity wastes caused by compressor raising frequency, greatly reduces power consumption, improves air-conditioning utilization ratio.
Specifically, in one embodiment, step S200 includes：
The default open range of electric expansion valve is determined according to indoor environment temperature and outdoor environment temperature, outdoor fan
The preset rotation speed scope of preset rotation speed scope and the indoor fan.
The initial opening K of the electric expansion valve is selected in the default open range of electric expansion valveInitiallyB, in outdoor wind
The initial speed V of outdoor fan is selected in the range of the preset rotation speed of machineIt is initial outer, select room in the range of the preset rotation speed of blower fan indoors
The initial speed V of inner blowerIn initial。
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is institute
The initial speed of outdoor fan is stated, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan.
Before oil return control, interval combinations are carried out to outdoor environment temperature and indoor environment temperature in advance, such as with temperature
It is that an index is that outdoor environment temperature and indoor environment temperature are divided that excursion, which is 5 °, outdoor environment temperature 35~
In the range of 40 °, if the now floating of indoor environment temperature is set to first interval at 35~40 °, if now indoor environment is floating
Move and be then set to second interval at 30~35 ° ... ... between Section Eight is set to if indoor environment temperature is 0~5 °, in outdoor environment
Temperature is 30~35 °, and indoor environment temperature is 35~40 ° and is then set to the 9th space ... ..., outdoor environment temperature
For 0~5 °, indoor environment temperature is 35~40 ° and is set to X space, and each space is rule of thumb or experiment is preset with accordingly
Electronic expansion valve opening scope, the outdoor fan range of speeds and the indoor fan range of speeds, the electric expansion valve of air conditioner, room
Outer blower fan and indoor fan are operated in corresponding preset range, can ensure corresponding pipeline pressure difference, reach the effect of oil return.
In the initial speed V of selection outdoor fanIt is initial outer, indoor fan initial speed VIn initialWith electric expansion valve initial opening KInitiallyb
When, corresponding aperture and rotating speed, Ji Nengman are selected in corresponding preset range according to outdoor environment temperature and indoor environment temperature
The demand of sufficient air-conditioner hose pressure difference, operation is relatively easy again, saves the time of selection.
It is determined that the default open range of electric expansion valve, the preset rotation speed scope of outdoor fan and presetting for indoor fan
After the range of speeds, the initial opening K of an electric expansion valve is selected in the default open range of electric expansion valveInitiallyB, and
The aperture for adjusting electric expansion valve is the initial opening K of above-mentioned electric expansion valveInitiallyB, in the range of the preset rotation speed of outdoor fan
Select the initial speed V of an outdoor fanIt is initial outer, and the rotating speed for adjusting outdoor fan is the initial speed of above-mentioned outdoor fan
VIt is initial outer, indoors in the range of the preset rotation speed of blower fan select an indoor fan initial speed VIn initial, and adjust indoor fan
Rotating speed be above-mentioned indoor fan initial speed VIn initial, so that it is guaranteed that just having necessarily when air conditioner has just enter into oil return pattern
Pipeline pressure difference, realize the effect of oil return.
In a real-time example, step S200 includes：
Detecting that suction superheat reaches the first preset limit value TThe limit 1When, control the rotating speed of indoor fan to stop, and
Outdoor fan is controlled to be run by existing rotating speed；
Detecting that suction superheat reaches the second preset limit value TThe limit 2When, control the rotating speed of outdoor fan to stop, and
Indoor fan is controlled to be run by existing rotating speed.
The present embodiment is more specific embodiment, and simply one kind in embodiment preferably selects, however it is not limited to this.Its
In the first preset limit value TThe limit 1Including the first refrigeration preset limit value TRefrigerating limit 1With the first heating preset limit value THeat the limit 1.The
One refrigeration preset limit value TRefrigerating limit 1One that the suction superheat of compressor under refrigeration mode reaches is operated in for air conditioner to face
Boundary's point (suction superheat crosses the point that conference causes compressor coil temperature protection switch to act and shut down), the default pole of the first heating
Limit value THeat the limit 1Critical point (the suction superheat that the suction superheat of compressor under heating mode reaches is operated in for air conditioner
Spend the small point for causing compressor hydraulic compression).Air conditioner operation in cooling mode when, when detecting that suction superheat reaches the
One refrigeration preset limit value TRefrigerating limit 1When, control the rotating speed of indoor fan to stop, with the refrigerant slowed down in evaporator of maximum
With the heat transfer rate of external environment condition, so as to reduce suction superheat, while keep the rotating speed of outdoor fan constant, keep air conditioner
With the heat exchange of outdoor environment, it can so ensure the system pressure in air conditioner, refrigerant drives lubricating oil in liquid form
Return to compressor.Air conditioner operation in cooling mode when, when detecting that suction superheat reaches the first heating preset limit value
THeat the limit 1When, control the rotating speed of indoor fan to stop, being handed over the heat of the refrigerant slowed down in condenser of maximum and external environment condition
Throw-over degree, while keep the rotating speed of outdoor fan constant, ensureing to reach oil return effect to ensure the system pressure in air conditioner
While fruit, the refrigerant and outdoor environment that make vaporizer side keep heat transfer rate, to ensure that suction superheat is unlikely to too low.
Second preset limit value TThe limit 2Including the second refrigeration preset limit value TRefrigerating limit 2With the second heating preset limit value
THeat the limit 2.Second refrigeration preset limit value TRefrigerating limit 2The suction superheat that compressor under refrigeration mode is operated in for air conditioner reaches
A critical point (the too small point for causing compressor hydraulic compression of suction superheat), the second heating preset limit value THeat the limit 2For sky
(suction superheat crosses conference and causes to press for the critical point that the suction superheat that tune device operates in compressor under heating mode reaches
The point that contracting machine coil temperature protection switch is acted and shut down).Air conditioner operation in cooling mode when, when detecting suction superheat
Degree reaches the second refrigeration preset limit value TRefrigerating limit 2When, control the rotating speed of outdoor fan to stop, with slowing down in condenser for maximum
The heat transfer rate of refrigerant and external environment condition, while keep the rotating speed of indoor fan constant, ensure the heat exchange of air conditioner indoor environment
On the basis of, moreover it is possible to suction superheat is unlikely to too low, while also assures that the pipeline pressure difference in air conditioner, refrigeration can be made
Agent drives lubricating oil to return to compressor in liquid form.Air conditioner operation in cooling mode when, when detecting suction superheat
Degree reaches the second heating preset limit value THeat the limit 2When, control the rotating speed of outdoor fan to stop, with slowing down in evaporator for maximum
The heat transfer rate of refrigerant and external environment condition, so that suction superheat is unlikely to too high, while keep the rotating speed of indoor fan not
Become, to ensure the normal heat exchange of air conditioner and indoor environment, and also ensure the pipeline pressure difference in air conditioner simultaneously, refrigeration can be made
Agent drives lubricating oil to return to compressor in liquid form.
In one embodiment, if air conditioner operation in cooling mode, after oil return pattern is entered, shields air conditioner
Anti-freeze function and reach the function of being shut down during default cryogenic temperature.
If air conditioner is run in a heating mode, after oil return pattern is entered, shield the defrosting function of air conditioner and reach
The function of being shut down during default heating temperature.
The operational mode of air conditioner includes refrigeration mode and heating mode, shields anti-freeze function in cooling mode and reaches
The function of being shut down during to default cryogenic temperature, when avoiding the air conditioner from operating under oil return pattern, anti-freeze pattern is converted to suddenly
Or shutdown mode influences the process of air conditioner oil returning, air conditioner is avoided because can not compressor abrasion or burning caused by oil return in time
Ruin.Defrosting function is shielded under heating mode and reaches the function of being shut down during default heating temperature, avoids air conditioner from operating in oil return
When under pattern, being converted to defrost pattern or shutdown mode suddenly influences the oil return process of air conditioner, avoid air conditioner because can not and
When compressor abrasion caused by oil return or burn.
In one embodiment, include after step S300：
Detecting that suction superheat reaches after default disengaging value or air conditioner run special time under oil return pattern, moving back
Go out oil return pattern, complete oil return.
If air conditioner is run in cooling mode, after oil return is completed, recover the anti-freeze function of air conditioner and reach pre-
If the function of being shut down during cryogenic temperature.
If air conditioner is run in a heating mode, after oil return is completed, recover the defrosting function of air conditioner and reach default
Heat the function of being shut down during temperature.
Detecting that suction superheat reaches default disengaging value TExitOr air conditioner runs special time T under oil return pattern2
After (such as 3min), oil return pattern is exited, the now oil return action of air conditioner is completed.After air conditioner completes oil return action, recover empty
The corresponding function that operates under corresponding modes of device is adjusted, to ensure that air conditioner being capable of normal work, it is ensured that the safety of whole system.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
In one embodiment, as shown in Fig. 2 additionally providing a kind of low frequency oil return control system of air conditioner, the system
Including：Detection module 100, for detecting the running frequency of compressor in air conditioner, suction superheat and the air conditioner
Indoor environment temperature and outdoor environment temperature.Oil return module 200, detect the running frequency of compressor less than default for working as
When preset time is run in the case of oil return frequency, air conditioner enters oil return pattern, according to indoor environment temperature and the outdoor
The initial opening K of electric expansion valve in environment temperature selection air conditionerInitiallyB, the initial speed V of outdoor fanIt is initial outerAnd indoor fan
Initial speed VIn initial, and the aperture for adjusting electric expansion valve is the initial opening of electric expansion valve, adjusts turning for outdoor fan
Speed is the initial speed of outdoor fan, and the rotating speed for adjusting indoor fan is the initial speed of indoor fan.Adjustment module 300, use
In turn that the aperture of the electric expansion valve, the rotating speed of outdoor fan and indoor fan are adjusted according to the suction superheat detected
Speed.
In the present embodiment, the compressor of air conditioner carries out oil return using pipeline pressure difference, in the case where meeting air conditioner low-frequency operation
Refrigeration requirement, while not influenceing air conditioner reliability of operation, overcome due to frequent raising frequency oil return and occur frequent
The technical problem of startup-shutdown, the situation of compressor oil starvation caused by avoiding frequent startup-shutdown, and due to not frequent startup-shutdown,
Therefore will not cause to use uncomfortable situation in room caused by temperature change, meanwhile, because compressor does not have raising frequency oil return,
So being wasted in the absence of unnecessary electricity caused by compressor raising frequency, power consumption is greatly reduced, improves air-conditioning utilization ratio.
In one embodiment, oil return module 200 includes：Determining unit 210, for according to the indoor environment temperature and
The outdoor environment temperature determines the default open range of electric expansion valve, the preset rotation speed scope and indoor fan of outdoor fan
Preset rotation speed scope.Selecting unit 220, the initial of electric expansion valve is selected to open in the default open range of electric expansion valve
Spend KInitiallyB, the initial speed V of outdoor fan is selected in the range of the preset rotation speed of outdoor fanIt is initial outer, blower fan is default indoors
The initial speed V of selection indoor fan in the range of speedsIn initial.Adjustment unit 230, for adjusting the aperture of electric expansion valve as electricity
The initial opening of sub- expansion valve, the rotating speed for adjusting outdoor fan is the initial speed of outdoor fan, adjusts the rotating speed of indoor fan
For the initial speed of indoor fan.
In one embodiment, adjustment module 300 includes：First control unit 310, for detecting the air-breathing mistake
Temperature reaches the first preset limit value TThe limit 1When, control the rotating speed of indoor fan to stop, and control outdoor fan by existing turn
Speed operation.Second control unit 320, for detecting that suction superheat reaches the second preset limit value TThe limit 2When, control room
The rotating speed of outer blower fan stops, and controls indoor fan to be run by existing rotating speed.
In one embodiment, in addition to：First shroud module 201, if for air conditioner operation in cooling mode,
Into after the oil return pattern, shield the anti-freeze function of air conditioner and reach the function of being shut down during default cryogenic temperature.Second
Shroud module 202, if for air conditioner operation in a heating mode, after the oil return pattern is entered, shielding the change of air conditioner
White function and the function of being shut down when reaching default heating temperature.
In one embodiment, in addition to：Module 400 is exited in oil return, for detecting that suction superheat reaches default
After disengaging value or air conditioner run special time under the oil return pattern, oil return pattern is exited, completes oil return.First recovers mould
Block 401, if for air conditioner operation in cooling mode, after oil return is completed, recovering the anti-freeze function of air conditioner and reaching
The function of being shut down during default cryogenic temperature.Second recovery module 402, if for air conditioner operation in a heating mode, completing
After oil return, recover the defrosting function of air conditioner and reach the function of being shut down during default heating temperature.
It is similar to a kind of low frequency method for controlling oil return of foregoing air conditioner to solve the principle of problem due to this system, therefore should
The implementation of system may refer to the implementation of preceding method, repeats part and repeats no more.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. the low frequency method for controlling oil return of a kind of air conditioner, it is characterised in that methods described includes：
Detect the running frequency of compressor, the indoor environment temperature of suction superheat and the air conditioner and room in air conditioner
External environment temperature；
It is described when the running frequency for detecting the compressor is running preset time in the case of less than default oil return frequency
Air conditioner enters oil return pattern, and electronics in the air conditioner is selected according to the indoor environment temperature and the outdoor environment temperature
The initial speed of the initial opening of expansion valve, the initial speed of outdoor fan and indoor fan, and adjust opening for electric expansion valve
Spend for the initial opening of the electric expansion valve, the rotating speed for adjusting outdoor fan is the initial speed of the outdoor fan, is adjusted
The rotating speed of indoor fan is the initial speed of the indoor fan；
The aperture of the electric expansion valve, the rotating speed of the outdoor fan and institute are adjusted according to the suction superheat detected
State the rotating speed of indoor fan.
2. the low frequency method for controlling oil return of air conditioner according to claim 1, it is characterised in that the air conditioner enters back
Oily pattern, opened according to the initial of electric expansion valve in the indoor environment temperature and outdoor environment temperature selection air conditioner
Degree, the initial speed of outdoor fan and the initial speed of indoor fan, and the aperture for adjusting electric expansion valve is swollen for the electronics
The initial opening of swollen valve, the rotating speed for adjusting outdoor fan is the initial speed of the outdoor fan, adjusts the rotating speed of indoor fan
For the indoor fan initial speed the step of include：
The default open range of the electric expansion valve, institute are determined according to the indoor environment temperature and the outdoor environment temperature
State the preset rotation speed scope of outdoor fan and the preset rotation speed scope of the indoor fan；
The initial opening of the electric expansion valve is selected in the default open range of the electric expansion valve, in the outdoor wind
The initial speed of the outdoor fan is selected in the range of the preset rotation speed of machine, is selected in the range of the preset rotation speed of the indoor fan
Select the initial speed of the indoor fan；
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is the room
The initial speed of outer blower fan, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan.
3. the low frequency method for controlling oil return of air conditioner according to claim 1, it is characterised in that what the basis detected
The suction superheat adjusts aperture, the rotating speed of the outdoor fan and the rotating speed of the indoor fan of the electric expansion valve
The step of include：
When detecting that the suction superheat reaches the first preset limit value, the rotating speed of the indoor fan is controlled to stop, and
The outdoor fan is controlled to be run by existing rotating speed；
When detecting that the suction superheat reaches the second preset limit value, the rotating speed of the outdoor fan is controlled to stop, and
The indoor fan is controlled to be run by existing rotating speed.
4. the low frequency method for controlling oil return of the air conditioner according to any one of claims 1 to 3, it is characterised in that if described
Air conditioner is run in cooling mode, after the oil return pattern is entered, is shielded the anti-freeze function of the air conditioner and is reached
The function of being shut down during default cryogenic temperature；
If the air conditioner operation is in a heating mode, after the oil return pattern is entered, the defrost work(of the air conditioner is shielded
The function of being shut down during default heating temperature and can be reached.
5. the low frequency method for controlling oil return of air conditioner according to claim 4, it is characterised in that detected in the basis
The suction superheat adjust turning for the aperture of the electric expansion valve, the rotating speed of the outdoor fan and the indoor fan
Include after the step of speed：
Detect the suction superheat reach default disengaging value or the air conditioner run under the oil return pattern it is specific
After time, oil return pattern is exited, completes oil return；
If the air conditioner operation is in cooling mode, after oil return is completed, recovers the anti-freeze function of the air conditioner and reach
The function of being shut down during to default cryogenic temperature；
If the air conditioner operation is in a heating mode, after oil return is completed, recovers the defrosting function of the air conditioner and reach
The function of being shut down during default heating temperature.
6. the low frequency oil return control system of a kind of air conditioner, it is characterised in that the system includes：
Detection module, for detecting the interior of the running frequency of compressor, suction superheat and the air conditioner in air conditioner
Environment temperature and outdoor environment temperature；
Oil return module, for being run when the running frequency for detecting the compressor in the case of less than default oil return frequency in advance
If during the time, the air conditioner enters oil return pattern, institute is selected according to the indoor environment temperature and the outdoor environment temperature
The initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan in air conditioner is stated, and is adjusted
The aperture of electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is the outdoor fan
Initial speed, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan；
Adjustment module, for the aperture that the electric expansion valve is adjusted according to the suction superheat detected, the outdoor
The rotating speed of the rotating speed of blower fan and the indoor fan.
7. the low frequency oil return control system of air conditioner according to claim 6, it is characterised in that the oil return module bag
Include：
Determining unit, for determining the pre- of the electric expansion valve according to the indoor environment temperature and the outdoor environment temperature
If open range, the preset rotation speed scope of the outdoor fan and the preset rotation speed scope of the indoor fan；
Selecting unit, the initial opening of the electric expansion valve is selected in the default open range of the electric expansion valve,
The initial speed of the outdoor fan is selected in the range of the preset rotation speed of the outdoor fan, default in the indoor fan turns
The initial speed of the selection indoor fan in fast scope；
Adjustment unit, the aperture for adjusting electric expansion valve are the initial opening of the electric expansion valve, adjust outdoor fan
Rotating speed be the outdoor fan initial speed, adjust indoor fan rotating speed be the indoor fan initial speed.
8. the low frequency oil return control system of air conditioner according to claim 6, it is characterised in that the adjustment module bag
Include：
First control unit, for when detecting that the suction superheat reaches the first preset limit value, controlling the interior
The rotating speed of blower fan stops, and controls the outdoor fan to be run by existing rotating speed；
Second control unit, for when detecting that the suction superheat reaches the second preset limit value, controlling the outdoor
The rotating speed of blower fan stops, and controls the indoor fan to be run by existing rotating speed.
9. the low frequency oil return control system of the air conditioner according to any one of claim 6 to 8, it is characterised in that also include：
First shroud module, if for air conditioner operation in cooling mode, after the oil return pattern is entered, shielding institute
State the anti-freeze function of air conditioner and reach the function of being shut down during default cryogenic temperature；
Secondary shielding module, if for air conditioner operation in a heating mode, after the oil return pattern is entered, shielding institute
State the defrosting function of air conditioner and reach the function of being shut down during default heating temperature.
10. the low frequency oil return control system of air conditioner according to claim 9, it is characterised in that also include：
Module is exited in oil return, for detecting that the suction superheat reaches default disengaging value or the air conditioner at described time
After running special time under oily pattern, oil return pattern is exited, completes oil return；
First recovery module, if for air conditioner operation in cooling mode, after oil return is completed, recovering the air conditioner
Anti-freeze function and reach the function of being shut down during default cryogenic temperature；
Second recovery module, if for air conditioner operation in a heating mode, after oil return is completed, recovering the air conditioner
Defrosting function and reach the function of being shut down during default heating temperature.
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| CN201510867355.5A CN105371531B (en) | 2015-11-30 | 2015-11-30 | The low frequency method for controlling oil return and system of air conditioner |
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