CN106524593B - The method for controlling oil return and device of air-cooled heat-pump air-conditioner group and its compressor - Google Patents
The method for controlling oil return and device of air-cooled heat-pump air-conditioner group and its compressor Download PDFInfo
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- CN106524593B CN106524593B CN201610982208.7A CN201610982208A CN106524593B CN 106524593 B CN106524593 B CN 106524593B CN 201610982208 A CN201610982208 A CN 201610982208A CN 106524593 B CN106524593 B CN 106524593B
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- compressor
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- cooled heat
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- 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
- F25B31/004—Lubrication oil recirculating arrangements
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- 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
- F25B49/022—Compressor control arrangements
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- 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
- F25B2600/02—Compressor control
-
- 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
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- 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
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- 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 invention discloses a kind of air-cooled heat-pump air-conditioner group and its method for controlling oil return and device of compressor; it the described method comprises the following steps: during compressor carries out oil return; if air-cooled heat-pump air-conditioner group meets set temperature halt condition; it then controls the restricting element in air-cooled heat-pump air-conditioner group to open to preset maximum opening, and obtains the present mode of operation of air-cooled heat-pump air-conditioner group；If present mode of operation is heating mode, then reduced step by step according to the running frequency that the pressure at expulsion of compressor controls compressor, if present mode of operation is refrigeration mode, then reduced step by step according to the running frequency that the back pressure of compressor controls compressor, until control compressor exits oil return process when the running frequency of compressor is less than or equal to the oil return time of the first predeterminated frequency or compressor more than or equal to the first preset time.To achieve the purpose that real oil return, and guarantee unit stable operation in oil return.
Description
Technical field
The present invention relates to field of home appliance technology, in particular to the oil return of compressor in a kind of air-cooled heat-pump air-conditioner group
The oil return control device of compressor and a kind of air-cooled heat with the device in control method, a kind of air-cooled heat-pump air-conditioner group
Pump air-conditioner set.
Background technique
In Air-Cooled Heat Pump Unit, when the operation of system long-time low-load, since the running frequency of compressor is low, arranging
Refrigeration oil can be taken out of while gas out, it is therefore desirable to carry out oil return control.During compressor carries out oil return, compressor
With the operation of higher frequency, when unit reaches set temperature, it is out of service that unit will be controlled, to be unable to reach real oil return
Purpose.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of oil return controlling parties of compressor in air-cooled heat-pump air-conditioner group
Method passes through the accurate of the running frequency of aperture and compressor to restricting element after unit meets set temperature halt condition
Control, enables unit to achieve the purpose that real oil return, while guaranteeing unit stable operation in oil return.
It is another object of the present invention to the oil return control devices for proposing compressor in a kind of air-cooled heat-pump air-conditioner group.
Yet another object of the invention is that proposing a kind of air-cooled heat-pump air-conditioner group.
To achieve the above object, one aspect of the present invention embodiment proposes compressor in a kind of air-cooled heat-pump air-conditioner group
Method for controlling oil return, comprising the following steps: S1, during the compressor carries out oil return, if the air-cooled heat pump is empty
Unit is adjusted to meet set temperature halt condition, then the restricting element controlled in the air-cooled heat-pump air-conditioner group is opened to preset
Maximum opening, and obtain the present mode of operation of the air-cooled heat-pump air-conditioner group；S2, if the air-cooled heat-pump air-conditioner group
Present mode of operation be heating mode, then controlled according to the pressure at expulsion of the compressor running frequency of the compressor by
Grade reduces, until the running frequency of the compressor is less than or equal to the first predeterminated frequency or the oil return time of the compressor is big
When being equal to the first preset time, controls the compressor and exit oil return process；S3, if the air-cooled heat-pump air-conditioner group
Present mode of operation is refrigeration mode, then controls the running frequency of the compressor step by step according to the back pressure of the compressor
It reduces, until the running frequency of the compressor is less than or equal to the oil return time of first predeterminated frequency or the compressor
When more than or equal to first preset time, controls the compressor and exit oil return process.
The method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention is carried out in compressor
During oil return, if air-cooled heat-pump air-conditioner group meets set temperature halt condition, air-cooled heat-pump air-conditioner group is controlled
In restricting element open to preset maximum opening, and obtain the present mode of operation of air-cooled heat-pump air-conditioner group.If wind
The present mode of operation of cold-heat pump air-conditioner set is heating mode refrigeration mode, then is controlled and compressed according to the pressure at expulsion of compressor
The running frequency of machine reduces step by step, if the present mode of operation of air-cooled heat-pump air-conditioner group is refrigeration mode, according to compression
The running frequency of the back pressure control compressor of machine reduces step by step, presets until the running frequency of compressor is less than or equal to first
When the oil return time of frequency or compressor is more than or equal to the first preset time, control compressor exits oil return process.Thus
After unit meets set temperature halt condition, by the accurate control of the running frequency of aperture and compressor to restricting element,
Enable unit to achieve the purpose that real oil return, while guaranteeing unit stable operation in oil return.
According to one embodiment of present invention, the pressure at expulsion according to the compressor controls the fortune of the compressor
Line frequency reduces step by step, it may include: S11, the running frequency for controlling the compressor reduce the second predeterminated frequency；S12, delay the
After two preset times, judge whether the pressure at expulsion of the compressor is more than or equal to the first preset pressure；S13, if the pressure
The pressure at expulsion of contracting machine is less than first preset pressure, then repeats step S12；S14, if the exhaust of the compressor
Pressure be more than or equal to first preset pressure, then repeat step S11-S13 so that the running frequency of the compressor by
Grade reduces.
According to one embodiment of present invention, the back pressure according to the compressor controls the fortune of the compressor
Line frequency reduces step by step, it may include: S21, the running frequency for controlling the compressor reduce third predeterminated frequency；S22, delay the
After three preset times, judge whether the back pressure of the compressor is more than or equal to the second preset pressure；S23, if the pressure
The back pressure of contracting machine is less than second preset pressure, then repeats step S22；S24, if the return-air of the compressor
Pressure be more than or equal to second preset pressure, then repeat step S21-S23 so that the running frequency of the compressor by
Grade reduces.
According to one embodiment of present invention, in above-mentioned air-cooled heat-pump air-conditioner group compressor method for controlling oil return,
Further include: judge whether the compressor needs oil return；If the compressor needs oil return, it is empty to control the air-cooled heat pump
It adjusts the present mode of operation of unit to remain unchanged, and controls the compressor and run with the 4th predeterminated frequency, and described in control
Restricting element is opened to the first default aperture so that the compressor starts carry out oil return, wherein the 4th predeterminated frequency is big
In first predeterminated frequency.
It is according to one embodiment of present invention, described to judge whether the compressor needs oil return, it may include: described in judgement
Whether the running frequency of compressor is less than or equal to first predeterminated frequency and continues the 4th preset time；If the compressor
Running frequency be less than or equal to first predeterminated frequency and continue the 4th preset time, then judge the compressor needs
Oil return.
To achieve the above object, another aspect of the present invention embodiment proposes compressor in a kind of air-cooled heat-pump air-conditioner group
Oil return control device, comprising: pressure acquisition module, for obtain the compressor pressure at expulsion or the compressor
Back pressure；Control module, the control module are connected with the pressure acquisition module, and the control module is used in the pressure
During contracting machine carries out oil return, if the air-cooled heat-pump air-conditioner group meets set temperature halt condition, described in control
Restricting element in air-cooled heat-pump air-conditioner group is opened to preset maximum opening, and obtains the air-cooled heat-pump air-conditioner group
Present mode of operation, wherein if the present mode of operation of the air-cooled heat-pump air-conditioner group is heating mode, the control mould
Block is then reduced according to the running frequency that the pressure at expulsion of the compressor controls the compressor step by step, until the compressor
When running frequency is less than or equal to the oil return time of the first predeterminated frequency or the compressor more than or equal to the first preset time, control
It makes the compressor and exits oil return process；If the present mode of operation of the air-cooled heat-pump air-conditioner group is refrigeration mode, institute
State control module then reduces according to the running frequency that the back pressure of the compressor controls the compressor step by step, until described
The running frequency of compressor is less than or equal to the oil return time of first predeterminated frequency or the compressor more than or equal to described
When the first preset time, controls the compressor and exit oil return process.
The oil return control device of compressor in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention is carried out in compressor
During oil return, if air-cooled heat-pump air-conditioner group meets set temperature halt condition, control module if, controls air-cooled heat pump
Restricting element in air-conditioner set is opened to preset maximum opening, and obtains the current operation mould of air-cooled heat-pump air-conditioner group
Formula.If the present mode of operation of air-cooled heat-pump air-conditioner group is heating mode, according to the exhaust pressure of compressor if control module
The running frequency of power control compressor reduces step by step, if the present mode of operation of air-cooled heat-pump air-conditioner group is refrigeration mode,
Control module is then reduced according to the running frequency that the back pressure of compressor controls compressor step by step, until the operation frequency of compressor
When rate is less than or equal to the oil return time of the first predeterminated frequency or compressor more than or equal to the first preset time, control compressor is moved back
Oil return process out.To pass through the fortune of aperture and compressor to restricting element after unit meets set temperature halt condition
The accurate control of line frequency, enables unit to achieve the purpose that real oil return, while guaranteeing unit stable operation in oil return.
According to one embodiment of present invention, the control module controls the pressure according to the pressure at expulsion of the compressor
When the running frequency of contracting machine reduces step by step, wherein it is pre- that the running frequency that the control module controls the compressor reduces by second
If frequency, and after second preset time that is delayed, judge whether the pressure at expulsion of the compressor is more than or equal to the first default pressure
Power, wherein if the pressure at expulsion of the compressor is less than first preset pressure, continue default in delay described second
Judge whether the pressure at expulsion of the compressor is more than or equal to first preset pressure after time, until the row of the compressor
When atmospheric pressure is more than or equal to first preset pressure, the running frequency for controlling the compressor reduces described second again and presets
Frequency, and after second preset time of being delayed continues to judge whether the pressure at expulsion of the compressor is more than or equal to described
First preset pressure, circuits sequentially, so that the running frequency of the compressor reduces step by step.
According to one embodiment of present invention, the control module controls the pressure according to the back pressure of the compressor
When the running frequency of contracting machine reduces step by step, wherein it is pre- that the running frequency that the control module controls the compressor reduces third
If frequency, and after the third preset time that is delayed, judge whether the back pressure of the compressor is more than or equal to the second default pressure
Power, wherein if the back pressure of the compressor is less than second preset pressure, continue default in the third that is delayed
Judge whether the back pressure of the compressor is more than or equal to second preset pressure after time, until the compressor returns
When atmospheric pressure is more than or equal to second preset pressure, the running frequency for controlling the compressor reduces the third again and presets
Frequency, and after the third preset time of being delayed continues to judge whether the back pressure of the compressor is more than or equal to described
Second preset pressure, circuits sequentially, so that the running frequency of the compressor reduces step by step.
According to one embodiment of present invention, the control module is also used to judge whether the compressor needs oil return,
If the compressor needs oil return, the present mode of operation that control module if controls the air-cooled heat-pump air-conditioner group is protected
It holds constant, and controls the compressor and run with the 4th predeterminated frequency, and the control restricting element is opened to first default
Aperture is so that the compressor starts carry out oil return, wherein the 4th predeterminated frequency is greater than first predeterminated frequency.
According to one embodiment of present invention, when the control module judges whether the compressor needs oil return, wherein
The control module judges whether the running frequency of the compressor is less than or equal to first predeterminated frequency and continues the 4th in advance
If the time, if the running frequency of the compressor be less than or equal to first predeterminated frequency and continue it is described 4th it is default when
Between, the control module then judges that the compressor needs oil return.
In addition, the embodiment of the present invention also proposed a kind of air-cooled heat-pump air-conditioner group comprising above-mentioned air-cooled heat pump
The oil return control device of compressor in air-conditioning unit.
The air-cooled heat-pump air-conditioner group of the embodiment of the present invention meets set temperature in unit by above-mentioned control device
After halt condition, by the accurate control of the running frequency of aperture and compressor to restricting element, unit is reached
The purpose of real oil return, while guaranteeing unit stable operation in oil return.
Detailed description of the invention
Fig. 1 is the process of the method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention
Figure；
Fig. 2 is the oil return control of air-cooled heat pump compressor in air-conditioning unit under heating mode according to an embodiment of the invention
The flow chart of method processed；And
Fig. 3 is that the box of the oil return control device of compressor in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention shows
It is intended to.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings in the air-cooled heat-pump air-conditioner group to describe the embodiment of the present invention compressor oil return controlling party
The oil return control device of compressor and the air-cooled heat-pump air-conditioner group with the device in method, air-cooled heat-pump air-conditioner group.
Fig. 1 is the process of the method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention
Figure.As shown in Figure 1, the method for controlling oil return of compressor can comprise the following steps that in the air-cooled heat-pump air-conditioner group
S1, during compressor carries out oil return, if air-cooled heat-pump air-conditioner group meets set temperature halt condition,
It then controls the restricting element in air-cooled heat-pump air-conditioner group to open to preset maximum opening, and obtains air-cooled heat-pump air-conditioner group
Present mode of operation.
Wherein, set temperature is the temperature of user setting, and preset maximum opening can be demarcated according to the actual situation, example
Such as, preset maximum opening can be 480P.
S2, if the present mode of operation of air-cooled heat-pump air-conditioner group is heating mode, according to the exhaust pressure of compressor
The running frequency of power control compressor reduces step by step, until the running frequency of compressor is less than or equal to the first predeterminated frequency or pressure
When the oil return time of contracting machine is more than or equal to the first preset time, control compressor exits oil return process.Wherein, the first predeterminated frequency
It can be demarcated according to the actual situation with the first preset time.
S3, if the present mode of operation of air-cooled heat-pump air-conditioner group is refrigeration mode, according to the return-air pressure of compressor
The running frequency of power control compressor reduces step by step, until the running frequency of compressor is less than or equal to the first predeterminated frequency or pressure
When the oil return time of contracting machine is more than or equal to the first preset time, control compressor exits oil return process.
Specifically, refrigeration oil can be pumped out, and be needed at this time when air-cooled heat-pump air-conditioner group long-time low-frequency operation
Carry out oil return.During oil return, compressor is run with higher running frequency, is set when air-cooled heat-pump air-conditioner group meets
When temperature halt condition, if control compressor emergency shutdown, will be unable to achieve the purpose that oil return.Therefore, meet set temperature in unit
When halt condition, by by the aperture regulation of the restricting element in unit to preset maximum opening, and according to the current of unit
Operational mode reduces the running frequency of compressor step by step, until the running frequency of compressor is reduced to the first default frequency
Rate then controls compressor and exits oil return process, and continue to work as alternatively, the oil return time of compressor reaches the first preset time
The operation of preceding operational mode, to not only can achieve the purpose of oil return, but also can guarantee unit can stable operation always, make
It obtains leaving water temperature and fluctuates very little.
According to one embodiment of present invention, it is dropped step by step according to the running frequency that the pressure at expulsion of compressor controls compressor
It is low, it may include:
S11, the running frequency for controlling compressor reduce the second predeterminated frequency.
S12, be delayed the second preset time after, judge whether the pressure at expulsion of compressor is more than or equal to the first preset pressure.
S13, if the pressure at expulsion of compressor repeats step S12 less than the first preset pressure.
S14 repeats step S11-S13 if the pressure at expulsion of compressor is more than or equal to the first preset pressure, with
Make the running frequency of compressor reduces step by step.
Wherein, the second predeterminated frequency, the second preset time and the first preset pressure can be demarcated according to the actual situation, example
Such as, the value range of the second predeterminated frequency can be 2-4Hz, and the value range of the second preset time can be 5-15s, preferably
Ground, the second preset time are 10s.
Specifically, when unit is run with heating mode, and unit satisfaction is set during compressor carries out oil return
When determining temperature halt condition, the restricting element first in control unit is opened to preset maximum opening (such as 480P), and will pressure
The running frequency of contracting machine reduces the second predeterminated frequency F2.It is delayed after the second preset time t 2 (such as 10s), judges the exhaust of compressor
Whether pressure Pd is less than the first preset pressure Pd1, if Pd < Pd1, after second preset time t 2 that is delayed, judgement is pressed again
Whether the pressure at expulsion Pd of contracting machine is less than the first preset pressure Pd1.If the pressure at expulsion Pd of compressor is default still less than first
Pressure Pd1 then continues to judge, and if Pd >=Pd1, the running frequency of compressor is reduced into the second predeterminated frequency again
F2, and after second preset time t 2 that is delayed, judge the pressure at expulsion Pd of compressor whether less than the first preset pressure Pd1 ...,
It is repeated according to above-mentioned steps, until the running frequency of compressor is less than or equal to the first predeterminated frequency F1 or compressor returns
The time M of oil is more than or equal to the first preset time M1, and control compressor exits oil return program.
Therefore, in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention compressor method for controlling oil return, in unit
After meeting set temperature halt condition, by the aperture regulation of restricting element in control unit to preset maximum opening, and root
The running frequency of compressor is reduced step by step according to the pressure at expulsion of compressor, so that unit achievees the purpose that oil return,
Guarantee that unit continues stable operation with heating mode simultaneously.
According to one embodiment of present invention, it is dropped step by step according to the running frequency that the back pressure of compressor controls compressor
It is low, it may include:
S21, the running frequency for controlling compressor reduce third predeterminated frequency.
S22, be delayed third preset time after, judge whether the back pressure of compressor is more than or equal to the second preset pressure.
S23, if the back pressure of compressor repeats step S22 less than the second preset pressure.
S24 repeats step S21-S23 if the back pressure of compressor is more than or equal to the second preset pressure, with
Make the running frequency of compressor reduces step by step.
Wherein, third predeterminated frequency, third preset time and the second preset pressure can be demarcated according to the actual situation, example
Such as, the value range of third predeterminated frequency can be 2-4Hz, and the value range of third preset time can be 5-15s, preferably
Ground, the second preset time are 10s.
Specifically, when unit is run in a chiller mode, and unit satisfaction is set during compressor carries out oil return
When determining temperature halt condition, the restricting element first in control unit is opened to preset maximum opening (such as 480P), and will pressure
The running frequency of contracting machine reduces third predeterminated frequency F3.It is delayed after third preset time t 3 (such as 10s), judges the return-air of compressor
Whether pressure Pe is less than the second preset pressure Pe1, if Pe < Pe1, after the third preset time t 3 that is delayed, judgement is pressed again
Whether the back pressure Pe of contracting machine is less than the second preset pressure Pe1.If the back pressure Pe of compressor is default still less than second
Pressure Pe1 then continues to judge, and if Pe >=Pe1, the running frequency of compressor is reduced into third predeterminated frequency again
F3, and after the third preset time t 3 that is delayed, judge the back pressure Pe of compressor whether less than the second preset pressure Pe1 ...,
It is repeated according to above-mentioned steps, until the running frequency of compressor is less than or equal to the first predeterminated frequency F1 or compressor returns
The time M of oil is more than or equal to the first preset time M1, and control compressor exits oil return program.
Therefore, in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention compressor method for controlling oil return, in unit
After meeting set temperature halt condition, by the aperture regulation of restricting element in control unit to preset maximum opening, and root
The running frequency of compressor is reduced step by step according to the back pressure of compressor, so that unit achievees the purpose that oil return,
Guarantee that unit continues stable operation in a chiller mode simultaneously.
It should be noted that in an embodiment of the present invention, either unit is run with heating mode or with the mould that freezes
Formula operation, if unit does not meet set temperature halt condition, directly judges whether needs according to the oil return time M of compressor
Oil return program is exited, i.e., when the oil return time M of compressor is more than or equal to the first preset time M1, control compressor exits oil return
Program.
In addition, if it is determined that unit defrosts, then exiting oil return when compressor carries out oil return with heating mode
Program, and enter defrosting control.
In addition, when unit is protected, then controlling compressor during compressor carries out oil return and exiting back
Oily program, and execute corresponding defencive function.
According to one embodiment of present invention, the method for controlling oil return of compressor is also in above-mentioned air-cooled heat-pump air-conditioner group
It include: to judge whether compressor needs oil return；If compressor needs oil return, the current fortune of air-cooled heat-pump air-conditioner group is controlled
Row mode remains unchanged, and controls compressor and run with the 4th predeterminated frequency, and control restricting element is opened to first and preset
Aperture is so that compressor starts carry out oil return.Wherein, the 4th predeterminated frequency is greater than the first predeterminated frequency, the 4th predeterminated frequency and the
One default aperture can be demarcated according to the actual situation.
Further, according to one embodiment of present invention, judging whether compressor needs oil return includes: judgement compressor
Running frequency whether be less than or equal to the first predeterminated frequency and continue the 4th preset time；If the running frequency of compressor is less than
Equal to the first predeterminated frequency and continue the 4th preset time, then judges that compressor needs oil return.Wherein, the 4th preset time can root
It is demarcated according to actual conditions.
Specifically, unit with heat or refrigeration mode run during, if the running frequency F of compressor is less than
Equal to the first predeterminated frequency F1, and duration H is greater than the 4th preset time H1, then can determine whether that compressor needs oil return, at this time
Controlling unit keeps present mode of operation constant, and the running frequency of compressor is turned up to the 4th predeterminated frequency F4, simultaneously will
The aperture regulation of restricting element is to the first default aperture P1 (if the aperture P of restricting element is default more than or equal to first in unit
Aperture P1, then the aperture of restricting element remains unchanged) so that compressor starts oil return.
To make those skilled in the art more clearly understand the present invention, Fig. 2 is heating according to an embodiment of the invention
The flow chart of the method for controlling oil return of air-cooled heat pump compressor in air-conditioning unit under mode.As shown in Fig. 2, the method for controlling oil return
It can comprise the following steps that
S101 starts.
S102, judges whether the running frequency F of compressor is less than or equal to the first predeterminated frequency F1, and duration H is greater than
4th preset time H1.If so, step S103 is executed, if not, return step S102.
S103 executes oil return program, and the runing time H of compressor is reset.
S104 keeps present mode of operation constant, and compressor operating frequency F is adjusted to the 4th predeterminated frequency F4, together
When the aperture P of restricting element is adjusted to the first default aperture P1.
S105, judges whether unit meets set temperature halt condition.If so, executing step S106；If not, executing
Step S110.
The aperture P of restricting element is adjusted to preset maximum opening 480P, and the running frequency of compressor is reduced by S106
Second predeterminated frequency F2.
S107 under heating mode, after second preset time t 2 that is delayed, judges whether the pressure at expulsion Pd of compressor is greater than
In the first preset pressure Pd1.If so, return step S106；If not, executing step S108.
S108, judges whether the running frequency F of compressor is less than or equal to the oil return of the first predeterminated frequency F1 or compressor
Time M is more than or equal to the first preset time M1.If so, executing step S109；If not, return step S107.
S109 exits oil return process.
The aperture P of S110, the running frequency F and restricting element that keep compressor are constant.
S111, judges whether the oil return time M of compressor is more than or equal to the first preset time M1.If so, executing step
S112；If not, return step S110.
S112 exits oil return program, and the runing time H of compressor is reset.
It is understood that under refrigeration mode the oil return process of compressor and compressor under heating mode oil return process phase
Seemingly, I will not elaborate.
In conclusion in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention compressor method for controlling oil return,
During compressor carries out oil return, if air-cooled heat-pump air-conditioner group meets set temperature halt condition, air-cooled heat is controlled
Restricting element in pump air-conditioner set is opened to preset maximum opening, and obtains the current operation mould of air-cooled heat-pump air-conditioner group
Formula.If the present mode of operation of air-cooled heat-pump air-conditioner group is heating mode refrigeration mode, according to the exhaust pressure of compressor
The running frequency of power control compressor reduces step by step, if the present mode of operation of air-cooled heat-pump air-conditioner group is refrigeration mode,
Then according to the back pressure of compressor control compressor running frequency reduce step by step, until compressor running frequency be less than etc.
When the oil return time of the first predeterminated frequency or compressor being more than or equal to the first preset time, control compressor exits oil return
Journey.To after unit meets set temperature halt condition, pass through the running frequency of aperture and compressor to restricting element
Accurate control so that unit is so as to achieve the purpose that real oil return, while guaranteeing unit stable operation in oil return.
Fig. 3 is that the box of the oil return control device of compressor in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention shows
It is intended to.As shown in figure 3, in the air-cooled heat-pump air-conditioner group compressor oil return control device can include: pressure acquisition module 10
With control module 20.
Wherein, pressure acquisition module 10 is used to obtain the pressure at expulsion Pd of the compressor or back pressure Pe of compressor.
Control module 20 is connected with pressure acquisition module 10, and control module 20 is used for during compressor carries out oil return, if wind
Cold-heat pump air-conditioner set meets set temperature halt condition, then controls the restricting element in air-cooled heat-pump air-conditioner group and open to pre-
If maximum opening, and obtain the present mode of operation of air-cooled heat-pump air-conditioner group.If air-cooled heat-pump air-conditioner group is current
Operational mode is heating mode, and control module 20 then controls the running frequency of compressor step by step according to the pressure at expulsion Pd of compressor
It reduces, until the running frequency F of compressor is less than or equal to the first predeterminated frequency F1 or the oil return time M of compressor is more than or equal to
When the first preset time M1, control compressor exits oil return process；If the present mode of operation of air-cooled heat-pump air-conditioner group is
Refrigeration mode, control module 20 are then reduced according to the running frequency that the back pressure Pe of compressor controls compressor step by step, until
The running frequency F of compressor is less than or equal to the first predeterminated frequency F1 or the oil return time M of compressor is default more than or equal to first
When time M1, control compressor exits oil return process.
According to one embodiment of present invention, control module 20 controls the fortune of compressor according to the pressure at expulsion Pd of compressor
When line frequency reduces step by step, wherein the running frequency that control module 20 controls compressor reduces the second predeterminated frequency F2, and is prolonging
When the second preset time t 2 after, judge whether the pressure at expulsion Pd of compressor is more than or equal to the first preset pressure Pd1, if compression
The pressure at expulsion Pd of machine then continues the row that compressor is judged after being delayed the second preset time t 2 less than the first preset pressure Pd1
Whether atmospheric pressure Pd is more than or equal to the first preset pressure Pd1, until the pressure at expulsion Pd of compressor is more than or equal to the first default pressure
When power Pd1, the running frequency for controlling compressor reduces the second predeterminated frequency F2 again, and after second preset time t 2 that is delayed,
Continue to judge whether the pressure at expulsion Pd of compressor is more than or equal to the first preset pressure Pd1, circuit sequentially, so that the fortune of compressor
Line frequency reduces step by step.
According to one embodiment of present invention, control module 20 controls the fortune of compressor according to the back pressure Pe of compressor
When line frequency reduces step by step, wherein the running frequency that control module 20 controls compressor reduces third predeterminated frequency F3, and is prolonging
When third preset time t 3 after, judge whether the back pressure Pe of compressor is more than or equal to the second preset pressure Pe1, if compression
The back pressure Pe of machine then continues to judge returning for compressor after being delayed third preset time t 3 less than the second preset pressure Pe1
Whether atmospheric pressure Pe is more than or equal to the second preset pressure Pe1, until the back pressure Pe of compressor is more than or equal to the second default pressure
When power Pe1, the running frequency for controlling compressor reduces third predeterminated frequency F3 again, and after the third preset time t 3 that is delayed,
Continue to judge whether the back pressure Pe of compressor is more than or equal to the second preset pressure Pe1, circuit sequentially, so that the fortune of compressor
Line frequency reduces step by step.
According to one embodiment of present invention, control module 20 is also used to judge whether compressor needs oil return, if pressure
Contracting machine needs oil return, and the present mode of operation that control module 20 then controls air-cooled heat-pump air-conditioner group remains unchanged, and controls pressure
Contracting machine is run with the 4th predeterminated frequency F4, and control restricting element open to the first default aperture P1 so that compressor starts into
Row oil return, wherein the 4th predeterminated frequency F4 is greater than the first predeterminated frequency F1.
Further, according to one embodiment of present invention, when control module 20 judges whether compressor needs oil return,
In, control module 20 judge the running frequency F of compressor whether be less than or equal to the first predeterminated frequency F1 and continue the 4th it is default when
Between H1, if the running frequency F of compressor is less than or equal to the first predeterminated frequency F1 and continue the 4th preset time H1, control module
20 judge that compressor needs oil return.
It should be noted that undisclosed in the oil return control device of compressor in the air-cooled heat-pump air-conditioner group of the disclosure
Details please refers to details disclosed in the method for controlling oil return of compressor in disclosure air-cooled heat-pump air-conditioner group, it is specific this
In repeat no more.
In conclusion in air-cooled heat-pump air-conditioner group according to an embodiment of the present invention compressor oil return control device,
During compressor carries out oil return, if air-cooled heat-pump air-conditioner group meets set temperature halt condition, control module if, is controlled
Restricting element in air-cooled heat-pump air-conditioner group processed is opened to preset maximum opening, and obtains working as air-cooled heat-pump air-conditioner group
Preceding operational mode.If the present mode of operation of air-cooled heat-pump air-conditioner group is heating mode, according to compressor if control module
Pressure at expulsion control compressor running frequency reduce step by step, if the present mode of operation of air-cooled heat-pump air-conditioner group be system
Cold mode, control module is then reduced according to the running frequency that the back pressure of compressor controls compressor step by step, until compressor
Running frequency when being less than or equal to oil return time of the first predeterminated frequency or compressor and being more than or equal to the first preset time, control
Compressor exits oil return process.To pass through the aperture and pressure to restricting element after unit meets set temperature halt condition
The accurate control of the running frequency of contracting machine, enables unit to achieve the purpose that real oil return, while guaranteeing unit in oil return
Stable operation.
In addition, the embodiment of the present invention also proposed a kind of air-cooled heat-pump air-conditioner group comprising above-mentioned air-cooled heat pump
The oil return control device of compressor in air-conditioning unit.
The air-cooled heat-pump air-conditioner group of the embodiment of the present invention meets set temperature in unit by above-mentioned control device
After halt condition, by the accurate control of the running frequency of aperture and compressor to restricting element, unit is reached
The purpose of real oil return, while guaranteeing unit stable operation in oil return.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (11)
1. the method for controlling oil return of compressor in a kind of air-cooled heat-pump air-conditioner group, which comprises the following steps:
S1, during the compressor carries out oil return, if the air-cooled heat-pump air-conditioner group meets set temperature shutdown
Condition, then the restricting element controlled in the air-cooled heat-pump air-conditioner group is opened to preset maximum opening, and obtains the wind
The present mode of operation of cold-heat pump air-conditioner set；
S2, if the present mode of operation of the air-cooled heat-pump air-conditioner group is heating mode, according to the row of the compressor
The running frequency that atmospheric pressure controls the compressor reduces step by step, until the running frequency of the compressor is less than or equal to first in advance
If the oil return time of frequency or the compressor is more than or equal to the first preset time, controls the compressor and exit oil return
Journey；
S3, if the present mode of operation of the air-cooled heat-pump air-conditioner group is refrigeration mode, according to returning for the compressor
The running frequency that atmospheric pressure controls the compressor reduces step by step, until the running frequency of the compressor is less than or equal to described the
When the oil return time of one predeterminated frequency or the compressor is more than or equal to first preset time, controls the compressor and move back
Oil return process out.
2. the method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group as described in claim 1, which is characterized in that described
It is reduced step by step according to the running frequency that the pressure at expulsion of the compressor controls the compressor, comprising:
S11, the running frequency for controlling the compressor reduce the second predeterminated frequency；
S12, be delayed the second preset time after, judge whether the pressure at expulsion of the compressor is more than or equal to the first preset pressure；
S13 repeats step S12 if the pressure at expulsion of the compressor is less than first preset pressure；
S14 repeats step S11- if the pressure at expulsion of the compressor is more than or equal to first preset pressure
S13, so that the running frequency of the compressor reduces step by step.
3. the method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group as described in claim 1, which is characterized in that described
It is reduced step by step according to the running frequency that the back pressure of the compressor controls the compressor, comprising:
S21, the running frequency for controlling the compressor reduce third predeterminated frequency；
S22, be delayed third preset time after, judge whether the back pressure of the compressor is more than or equal to the second preset pressure；
S23 repeats step S22 if the back pressure of the compressor is less than second preset pressure；
S24 repeats step S21- if the back pressure of the compressor is more than or equal to second preset pressure
S23, so that the running frequency of the compressor reduces step by step.
4. the method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group as claimed in any one of claims 1-3, special
Sign is, further includes:
Judge whether the compressor needs oil return；
If the compressor needs oil return, the present mode of operation for controlling the air-cooled heat-pump air-conditioner group is remained unchanged,
And control the compressor and run with the 4th predeterminated frequency, and the control restricting element open to the first default aperture so that
The compressor starts carry out oil return, wherein the 4th predeterminated frequency is greater than first predeterminated frequency.
5. the method for controlling oil return of compressor in air-cooled heat-pump air-conditioner group as claimed in claim 4, which is characterized in that described
Judge whether the compressor needs oil return, comprising:
Judge whether the running frequency of the compressor is less than or equal to first predeterminated frequency and continues the 4th preset time；
If the running frequency of the compressor is less than or equal to first predeterminated frequency and continues the 4th preset time,
Judge that the compressor needs oil return.
6. the oil return control device of compressor in a kind of air-cooled heat-pump air-conditioner group characterized by comprising
Pressure acquisition module, for obtaining the pressure at expulsion of the compressor or the back pressure of the compressor；
Control module, the control module are connected with the pressure acquisition module, and the control module is used in the compressor
During carrying out oil return, if the air-cooled heat-pump air-conditioner group meets set temperature halt condition, control described air-cooled
Restricting element in heat pump air conditioner unit is opened to preset maximum opening, and obtains the current of the air-cooled heat-pump air-conditioner group
Operational mode, wherein
If the present mode of operation of the air-cooled heat-pump air-conditioner group is heating mode, according to the pressure if control module
The running frequency that the pressure at expulsion of contracting machine controls the compressor reduces step by step, until the compressor running frequency be less than etc.
When the oil return time of the first predeterminated frequency or the compressor being more than or equal to the first preset time, controls the compressor and move back
Oil return process out；
If the present mode of operation of the air-cooled heat-pump air-conditioner group is refrigeration mode, according to the pressure if control module
The running frequency that the back pressure of contracting machine controls the compressor reduces step by step, until the compressor running frequency be less than etc.
When the oil return time of first predeterminated frequency or the compressor being more than or equal to first preset time, described in control
Compressor exits oil return process.
7. the oil return control device of compressor in air-cooled heat-pump air-conditioner group as claimed in claim 6, which is characterized in that described
When control module reduces step by step according to the running frequency that the pressure at expulsion of the compressor controls the compressor, wherein
The running frequency that the control module controls the compressor reduces the second predeterminated frequency, and in second preset time that is delayed
Afterwards, judge whether the pressure at expulsion of the compressor is more than or equal to the first preset pressure, wherein if the exhaust of the compressor
Pressure is less than first preset pressure, then continues the exhaust pressure that the compressor is judged after being delayed second preset time
Whether power is more than or equal to first preset pressure, until the pressure at expulsion of the compressor is more than or equal to the described first default pressure
When power, the running frequency for controlling the compressor reduces by second predeterminated frequency again, and when delay described second is default
Between after, continue to judge whether the pressure at expulsion of the compressor is more than or equal to first preset pressure, circuit sequentially, so that institute
The running frequency for stating compressor reduces step by step.
8. the oil return control device of compressor in air-cooled heat-pump air-conditioner group as claimed in claim 6, which is characterized in that described
When control module reduces step by step according to the running frequency that the back pressure of the compressor controls the compressor, wherein
The running frequency that the control module controls the compressor reduces third predeterminated frequency, and in delay third preset time
Afterwards, judge whether the back pressure of the compressor is more than or equal to the second preset pressure, wherein if the return-air of the compressor
Pressure is less than second preset pressure, then continues the return-air pressure that the compressor is judged after being delayed the third preset time
Whether power is more than or equal to second preset pressure, until the back pressure of the compressor is more than or equal to the described second default pressure
When power, the running frequency for controlling the compressor reduces the third predeterminated frequency again, and when the third that is delayed is default
Between after, continue to judge whether the back pressure of the compressor is more than or equal to second preset pressure, circuit sequentially, so that institute
The running frequency for stating compressor reduces step by step.
9. the oil return control device of compressor in the air-cooled heat-pump air-conditioner group as described in any one of claim 6-8, special
Sign is that the control module is also used to judge whether the compressor needs oil return, if the compressor needs oil return, institute
State control module and then control the present mode of operation of the air-cooled heat-pump air-conditioner group and remain unchanged, and control the compressor with
The operation of 4th predeterminated frequency, and the control restricting element is opened to the first default aperture so that the compressor starts carry out
Oil return, wherein the 4th predeterminated frequency is greater than first predeterminated frequency.
10. the oil return control device of compressor in air-cooled heat-pump air-conditioner group as claimed in claim 9, which is characterized in that institute
When stating control module and judging whether the compressor needs oil return, wherein
The control module judges whether the running frequency of the compressor is less than or equal to first predeterminated frequency and continues
Four preset times, if the running frequency of the compressor is less than or equal to first predeterminated frequency and the lasting described 4th presets
Time, the control module then judge that the compressor needs oil return.
11. a kind of air-cooled heat-pump air-conditioner group, which is characterized in that including the air-cooled heat as described in any one of claim 6-10
Pump the oil return control device of compressor in air-conditioning unit.
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| EP4170250A4 (en) * | 2020-09-28 | 2023-12-06 | GD Midea Air-Conditioning Equipment Co., Ltd. | Air conditioner, and method for controlling electronic expansion valve of indoor unit thereof, and device |
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| CN107560255B (en) * | 2017-08-23 | 2018-11-30 | 珠海格力电器股份有限公司 | Heat pump unit and control method thereof |
| CN107588513B (en) * | 2017-09-15 | 2020-01-07 | 广东美的暖通设备有限公司 | Air conditioning system, control method and control device of air conditioning system |
| CN110608520B (en) * | 2019-09-26 | 2021-07-16 | 广东美的制冷设备有限公司 | Air conditioner, control method thereof and readable storage medium |
| CN110762901B (en) * | 2019-11-11 | 2022-01-18 | 宁波奥克斯电气股份有限公司 | Auxiliary oil return control method and device and air conditioner |
| CN111271900B (en) * | 2019-12-10 | 2021-08-13 | 宁波奥克斯电气股份有限公司 | Compressor oil return control method and system and air conditioner |
| CN115978738B (en) * | 2022-12-13 | 2024-05-10 | 珠海格力电器股份有限公司 | Oil return control method and air conditioning system |
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