CN106642771A - Oil return control method and device of refrigeration house multi-connected unit and refrigeration house multi-connected unit - Google Patents
Oil return control method and device of refrigeration house multi-connected unit and refrigeration house multi-connected unit Download PDFInfo
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- CN106642771A CN106642771A CN201611069113.2A CN201611069113A CN106642771A CN 106642771 A CN106642771 A CN 106642771A CN 201611069113 A CN201611069113 A CN 201611069113A CN 106642771 A CN106642771 A CN 106642771A
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- freezer
- joint unit
- oil return
- unit
- joint
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Classifications
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
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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
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
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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
- F25B2700/03—Oil level
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides an oil return control method and device of a refrigeration house multi-connected unit and the refrigeration house multi-connected unit. The oil return control method of the refrigeration house multi-connected unit comprises the steps that an operating state of the refrigeration house multi-connected unit is detected; the step of detecting the operating state of the refrigeration house multi-connected unit includes the sub-step of detecting the operating load of the refrigeration house multi-connected unit and starting times of the refrigeration house multi-connected unit; whether the refrigeration house multi-connected unit is in an oil shortage state or not is judged according to the detected operating state of the refrigeration house multi-connected unit; if the refrigeration house multi-connected unit is in the oil shortage state, the refrigeration house multi-connected unit is controlled to execute oil return operation. According to the technical scheme, an intelligent oil return control mode is adopted, the problem of parallel connection unit oil return brought by long-term partial load operation and frequent starting is very well solved, and the operating reliability of the unit can be greatly improved.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly to a kind of method for controlling oil return of the multi-joint unit of freezer, device and
The multi-joint unit of freezer.
Background technology
In large cold storage, typically multiple compressors are lowered the temperature to multiple storehouses.Due to the change of freezer load, compressor
Startup-shutdown quantity also changes therewith, and the operation of freezer unit Partial shrinkage machine is referred to as unit operation at part load.Large cold storage unit
Oepration at full load situation is less, is chronically at operation at part load state, and inspiratory flow rate is low during operation at part load, can bring machine
Group oil starvation problem.Therefore, how to solve the problems, such as that long term portion load operation unit oil starvation is urgently to solve at present in unit design
Problem certainly.
The content of the invention
In view of this, the invention provides a kind of method for controlling oil return of the multi-joint unit of freezer, including：Detection freezer is multi-joint
The running status of unit；The running status for detecting the multi-joint unit of freezer includes：Detect the operation of the multi-joint unit of the freezer
The number of starts of load and the multi-joint machine set compressor of the freezer；According to the running status of the multi-joint unit of the freezer for detecting
Judge the multi-joint unit of the freezer whether in oil starvation state；If the multi-joint unit of the freezer is in oil starvation state, control is described
The multi-joint unit of freezer performs oil return operation.
Alternatively, the operating load of the multi-joint unit of the detection freezer includes：In detecting the multi-joint unit of the freezer
The running current of each compressor, judges that the operation of the multi-joint unit of the freezer is born according to the running current of each compressor
Lotus.
Alternatively, the running status of the multi-joint unit of freezer for detecting described in the basis judges the multi-joint unit of the freezer
Whether oil starvation state is in, including：If it is negative less than or equal to default first in operating load to detect the multi-joint unit of the freezer
The time for adding up operation under conditions of lotus lower limit has reached default oil return detection time, then judge at the multi-joint unit of the freezer
In oil starvation state；With, if detecting in default oil return detection time, the number of starts of the multi-joint machine set compressor of the freezer
More than or equal to default startup upper limit number of times, then judge that the multi-joint unit of the freezer is in oil starvation state.
Alternatively, it is before the multi-joint unit execution oil return operation of the freezer is controlled, the accumulative run time is clear
Zero；There is high pressure after controlling the multi-joint unit execution oil return operation of the freezer and completing or performing before oil return operation is completed
When unloading or high pressure hold mode, restart to add up the run time.
Alternatively, the execution oil return operation includes：Unloading magnetic valve is closed, when controlled loading magnetic valve is with Preset Time
Every periodically powering on；And/or the quantity of the compressor of increase running status, until the operating load of the multi-joint unit of the freezer reaches
To default second load lower limit.
Alternatively, it is additionally included in and meets following condition arbitrarily for the moment, stops performing the oil return operation：(1) use and open
Put row power-off operation into, the switch includes hand switch, time switch or remote switch；(2) at the multi-joint unit of the freezer
In low-voltage variation holding state；(3) quantity of the multi-joint unit of the freezer in the compressor of normal condition is numerically less than
Default first load lower limit；(4) the multi-joint unit of the freezer is in failsafe state, and the error protection is protected including high pressure
The high protection of shield, low-voltage variation, overcurrent protection or compressor winding temperature；(5) time that continuously carries out of oil return operation reach
To default oil return run time threshold value.
Another aspect of the present invention provides a kind of oil return control device of the multi-joint unit of freezer again, including：Detection module,
For detecting the running status of the multi-joint unit of freezer；The running status for detecting the multi-joint unit of freezer includes：Detect described cold
The operating load of the multi-joint unit in storehouse and the number of starts of the multi-joint machine set compressor of the freezer；Judge module, for according to described
Whether the running status of the multi-joint unit of freezer for detecting judges the multi-joint unit of the freezer in oil starvation state；Oil return module,
In the case of being in oil starvation state in the multi-joint unit of the freezer, control the multi-joint unit of the freezer and perform oil return operation.
Alternatively, the detection module includes operating load detector unit, for detecting the fortune of the multi-joint unit of the freezer
Row load；The operating load for detecting the multi-joint unit of the freezer includes：Detect each compression in the multi-joint unit of the freezer
The running current of machine, according to the running current of each compressor the operating load of the multi-joint unit of the freezer is judged；It is described
Detection module also includes number of starts detector unit, for detecting the number of starts of the multi-joint machine set compressor of the freezer.
Alternatively, the judge module includes：Operating load judging unit, is used for：If detecting the freezer multi-connected machine
The time that group adds up to run under conditions of operating load is less than or equal to default first load lower limit has reached default oil return
Detection time, then judge that the multi-joint unit of the freezer is in oil starvation state；Number of starts judging unit, is used for：If detecting
In default oil return detection time, the number of starts of the multi-joint machine set compressor of the freezer is more than or equal to the default startup upper limit time
Number, then judge that the multi-joint unit of the freezer is in oil starvation state.
Alternatively, the judge module includes timing unit, is used for：Oil return behaviour is performed the multi-joint unit of the freezer is controlled
Before work, the accumulative run time is reset；Control the multi-joint unit of the freezer perform after oil return operation is completed or
When there is high pressure unloading or high pressure hold mode before execution oil return operation is completed, when restarting to add up the operation
Between.
Alternatively, the oil return module includes performance element, and for closing unloading magnetic valve, controlled loading magnetic valve is with pre-
If the time is after periodically powering on；And/or the quantity of the compressor of increase running status, until the fortune of the multi-joint unit of the freezer
Row load reaches default second load lower limit.
Alternatively, the oil return module also includes exiting unit, for meeting following condition arbitrarily for the moment, stops holding
The row oil return operation：(1) power-off operation is carried out using switch, the switch includes hand switch, time switch or remotely opens
Close；(2) the multi-joint unit of the freezer is in low-voltage variation holding state；(3) the multi-joint unit of the freezer is in normal condition
The quantity of compressor is numerically less than default first load lower limit；(4) the multi-joint unit of the freezer is in error protection shape
State, the error protection includes the high protection of high voltage protective, low-voltage variation, overcurrent protection or compressor winding temperature；(5) it is described
The time that continuously carries out of oil return operation reaches default oil return run time threshold value.
Another aspect of the invention additionally provides a kind of multi-joint unit of freezer, with the freezer multi-connected machine described in any of the above item
The oil return control device of group.
The technical scheme that the present invention is provided adopts a kind of control mode of intelligent oil return, solves well in long-term portion
The Parallel sets problem of oil return for dividing load operation and frequent starting to bring, greatly improves unit operation reliability.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the general frame figure of the method for controlling oil return of the multi-joint unit of freezer that the present invention is provided；
Fig. 2 is a kind of flow chart of preferred embodiment of the method for controlling oil return of the multi-joint unit of freezer that the present invention is provided；
Fig. 3 is the overall structure figure of the oil return control device of the multi-joint unit of freezer that the present invention is provided；
Fig. 4 is a kind of structural representation of preferred embodiment of the oil return control device of the multi-joint unit of freezer that the present invention is provided
Figure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Corresponding accompanying drawing is clearly and completely described to technical solution of the present invention.Obviously, described embodiment is only the present invention one
Section Example, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, belong to the scope of protection of the invention.
It should be noted that description and claims of this specification and the term " first " in above-mentioned accompanying drawing, "
Two " it is etc. the object for distinguishing similar, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating here or
Order beyond those of description is implemented.Additionally, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, and for example, process, method, system, product or the equipment for containing series of steps or unit is not necessarily limited to
Those steps clearly listed or unit, but may include clearly not list or for these processes, method, product
Or intrinsic other steps of equipment or unit.
The invention provides a kind of method for controlling oil return of the multi-joint unit of freezer.Fig. 1 is that the freezer that the present invention is provided is multi-joint
The general frame figure of the method for controlling oil return of unit.As shown in figure 1, the method for controlling oil return bag of the multi-joint unit of freezer of the present invention
Include：Step S110, detects the running status of the multi-joint unit of freezer；The running status for detecting the multi-joint unit of freezer includes：Inspection
Survey the operating load of the multi-joint unit of the freezer and the number of starts of the multi-joint machine set compressor of the freezer；Step S120, according to
Whether the running status of the multi-joint unit of the freezer for detecting judges the multi-joint unit of the freezer in oil starvation state；Step
S130, if the multi-joint unit of the freezer is in oil starvation state, controls the multi-joint unit of the freezer and performs oil return operation.The present invention is carried
For technical scheme by the pressure and current value under the different operating modes of detection, whether intelligent decision unit is in oil starvation state.Such as
Fruit unit is in oil starvation state, is quickly loaded by compressor, increases compressor mode, makes unit heavy-duty service oil return.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, the detection freezer is more
Online group of operating load includes：The running current of each compressor in the multi-joint unit of the freezer is detected, according to described each
The running current of compressor judges the operating load of the multi-joint unit of the freezer.
Multi-joint unit is used in large cold storage, and multiple compressors are lowered the temperature to multiple storehouses.In step s 110, on the one hand
The operating load of the multi-joint unit of detection freezer, unit load is all compressor load sums in unit, and after start, unit is without reason
Hinder and the normal feed flow of storehouse, then the running current of each compressor of real-time detection, so as to judge the operating load of unit；It is another
Aspect will detect the number of starts of the multi-joint machine set compressor of freezer, any one compressor in Parallel sets system from it is standby to
During operation, then unit starting number of times is 1 time.The operating load and the multi-joint machine set compressor of freezer of the multi-joint unit of freezer for detecting
The number of starts judge unit whether in the foundation of oil starvation state as next step.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, detect described in the basis
The running status of the multi-joint unit of freezer judge the multi-joint unit of the freezer whether in oil starvation state, including：If detecting institute
State the multi-joint unit of freezer operating load be less than or equal to default first load lower limit under conditions of add up operation time reach
Default oil return detection time, then judge that the freezer multi-joint unit is in oil starvation state；With if detecting at default time
In oily detection time, the number of starts of the multi-joint machine set compressor of the freezer is then sentenced more than or equal to default startup upper limit number of times
The multi-joint unit of the freezer that breaks is in oil starvation state.That is, unit long-time is in operation at part load state, Huo Zhe
In the case that high frequent starts, then unit is judged in oil starvation state, next step will perform oil return operation.
Fig. 2 is a kind of flow chart of preferred embodiment of the method for controlling oil return of the multi-joint unit of freezer that the present invention is provided.
As shown in Fig. 2 first trip execution step S201 detection unit load, and step S202 detection compressor start number of times.In step
After S201 and step S202, execution step S203 judges unit whether operation at part load or frequent start-stop.If then performing
Oil return operates (S205 the step of after step S204), if otherwise still in refrigeration mode (step S206).Above-mentioned enforcement
In example, while unit load and compressor start number of times are detected, as long as meeting one of above-mentioned two condition, it is possible to judge described
The multi-joint unit of freezer is in oil starvation state.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, controlling, the freezer is multi-joint
Unit is performed before oil return operation (step S205), and the accumulative run time is reset (such as the step S204 institute in Fig. 2
Show).Complete after controlling multi-joint unit execution oil return operation (step S205) of the freezer and completing or oil return operation is performed
When occurring high pressure unloading or high pressure hold mode before, restart to add up the run time (such as step S207 in Fig. 2
It is shown).Just restart to add up the run time when there is high pressure unloading or high pressure hold mode, can make next time
Conclusion when judging whether in oil starvation state is more accurate, it is ensured that in oil starvation state when perform oil return operation in time, to the greatest extent
Possibly accomplish intelligent oil return.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, the execution oil return operation
(i.e. step S205 in Fig. 2) includes：Unloading magnetic valve is closed, controlled loading magnetic valve is logical after periodicity with Preset Time
Electricity；And/or increase the quantity of the compressor of running status, until the operating load of the multi-joint unit of the freezer reaches default the
Two load lower limits.By wire by electromagnetic valve body interior loop input pulse signal, magnetic valve is controlled periodically by pulse signal
Open and close, the time of opening and closing can pre-set according to actual conditions.According to actual conditions, default second load
Lower limit can be with identical with above-mentioned default first load lower limit, it is also possible to different, and the second load lower limit can also be negative more than first
Lotus lower limit.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, it is additionally included in and meets following bar
Part arbitrarily for the moment, stops performing oil return operation (i.e. step S208 in Fig. 2)：(1) power-off operation is carried out using switch,
The switch includes hand switch, time switch or remote switch；(2) the multi-joint unit of the freezer is in the standby shape of low-voltage variation
State；(3) quantity of the multi-joint unit of the freezer in the compressor of normal condition is numerically less than under default first load
Limit；(4) the multi-joint unit of the freezer is in failsafe state, and the error protection includes high voltage protective, low-voltage variation, excessively electric
Stream protection or the high protection of compressor winding temperature；(5) time that continuously carries out of oil return operation reach default oil return operation
Time threshold.When above several situations are in shutdown, when standby, error protection and when the oil return operation duration is long,
Be not suitable for being further continued for carrying out oil return operation in the case of these, so stop oil return operation；Also in the multi-joint unit of freezer in just
In the case that often the quantity of the compressor of state is numerically less than default first load lower limit, even if being now completely in just
Often the compressor of state is all in the state of operating at full capacity, and unit can not reach default first load lower limit, therefore this
In the case of also need not perform again oil return operation.
Another aspect of the present invention is again there is provided a kind of oil return control device of the multi-joint unit of freezer.Fig. 3 is that the present invention is carried
For the multi-joint unit of freezer oil return control device overall structure figure.As shown in figure 3, the oil return of the multi-joint unit of freezer of the present invention
Control device includes：Detection module 100, for detecting the running status of the multi-joint unit of freezer；It is described to detect the multi-joint unit of freezer
Running status include：Detect the operating load of the multi-joint unit of the freezer and the startup time of the multi-joint machine set compressor of the freezer
Number；Judge module 200, for judging the multi-joint unit of the freezer according to the running status of the multi-joint unit of the freezer for detecting
Whether oil starvation state is in；Oil return module 300, in the case of being in oil starvation state in the multi-joint unit of the freezer, control
The multi-joint unit of the freezer performs oil return operation.
Fig. 4 is a kind of structural representation of preferred embodiment of the oil return control device of the multi-joint unit of freezer that the present invention is provided
Figure.As shown in figure 4, the detection module 100 includes operating load detector unit 110, for detecting the multi-joint unit of the freezer
Operating load；The operating load for detecting the multi-joint unit of the freezer includes：Detect each in the multi-joint unit of the freezer
The running current of compressor, according to the running current of each compressor the operating load of the multi-joint unit of the freezer is judged；
The detection module also includes number of starts detector unit 120, for detecting the startup time of the multi-joint machine set compressor of the freezer
Number.
According to a kind of embodiment of the oil return control device of the multi-joint unit of freezer of the present invention, the judge module 200 is wrapped
Include：Operating load judging unit 210, is used for：If detecting the multi-joint unit of the freezer in operating load less than or equal to default
The time for adding up operation under conditions of first load lower limit has reached default oil return detection time, then judge that the freezer is multi-joint
Unit is in oil starvation state；Number of starts judging unit 220, is used for：It is described if detecting in default oil return detection time
The number of starts of the multi-joint machine set compressor of freezer then judges the multi-joint unit of the freezer more than or equal to default startup upper limit number of times
In oil starvation state.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, the judge module 200 is wrapped
Timing unit 230 is included, is used for：Controlling before the multi-joint unit of the freezer performs oil return operation, by during the accumulative operation
Between reset；Occur after controlling the multi-joint unit execution oil return operation of the freezer and completing or performing before oil return operation is completed
When high pressure unloading or high pressure hold mode, restart to add up the run time.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, the oil return module 300 is wrapped
Performance element 310 is included, for closing unloading magnetic valve, controlled loading magnetic valve is with Preset Time after periodically powering on；And/or
Increase the quantity of the compressor of running status, until the operating load of the multi-joint unit of the freezer is reached under default second load
Limit.
According to a kind of embodiment of the method for controlling oil return of the multi-joint unit of freezer of the present invention, the oil return module 300 is also
Including unit 320 is exited, for meeting following condition arbitrarily for the moment, stop performing the oil return operation：(1) using switch
Power-off operation is carried out, the switch includes hand switch, time switch or remote switch；(2) the multi-joint unit of the freezer is in
Low-voltage variation holding state；(3) quantity of the multi-joint unit of the freezer in the compressor of normal condition is numerically less than pre-
If the first load lower limit；(4) the multi-joint unit of the freezer is in failsafe state, and the error protection is protected including high pressure
The high protection of shield, low-voltage variation, overcurrent protection or compressor winding temperature；(5) time that continuously carries out of oil return operation reach
To default oil return run time threshold value.
Another aspect of the invention additionally provides a kind of multi-joint unit of freezer, with the freezer multi-connected machine described in any of the above item
The oil return control device of group.
The technical scheme that the present invention is provided adopts a kind of control mode of intelligent oil return, solves well in long-term portion
The Parallel sets problem of oil return for dividing load operation and frequent starting to bring, greatly improves unit operation reliability.
Function described herein can be implemented in hardware, the software by computing device, firmware or its any combinations.
If implemented in the software by computing device, then computer can be stored in using function as one or more instructions or code
Transmitted on readable media or via computer-readable media.Other examples and embodiment will in of the invention and appended right
Ask in the scope and spirit of book.For example, be attributed to the property of software, function described above can use by processor,
Hardware, firmware, hardwired or the software that the combination of whichever is performed of appointing in these are implemented.Additionally, each functional unit can be with integrated
In a processing unit, or unit is individually physically present, it is also possible to which two or more units are integrated in
In one unit.
In several embodiments provided herein, it should be understood that disclosed technology contents, can pass through other
Mode is realized.Wherein, device embodiment described above is only schematic, such as the division of described unit, Ke Yiwei
A kind of division of logic function, can there is an other dividing mode when actually realizing, such as multiple units or component can with reference to or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
Connect, can be electrical or other forms.
It is described as separating component explanation unit can be or may not be it is physically separate, as control dress
The part put can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On unit.Some or all of unit therein can according to the actual needs be selected to realize the purpose of this embodiment scheme.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used
When, during a computer read/write memory medium can be stored in.Based on such understanding, technical scheme is substantially
The part for contributing to prior art in other words or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or network equipment etc.) perform the whole of each embodiment methods described of the invention or
Part steps.And aforesaid storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. are various can be with store program codes
Medium.
Embodiments of the invention are the foregoing is only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within scope of the presently claimed invention.
Claims (13)
1. the method for controlling oil return of the multi-joint unit of a kind of freezer, it is characterised in that include：
The running status of the multi-joint unit of detection freezer；The running status for detecting the multi-joint unit of freezer includes：Detect described cold
The operating load of the multi-joint unit in storehouse and the number of starts of the multi-joint machine set compressor of the freezer；
Judge the multi-joint unit of the freezer whether in oil starvation shape according to the running status of the multi-joint unit of the freezer for detecting
State；
If the multi-joint unit of the freezer is in oil starvation state, controls the multi-joint unit of the freezer and perform oil return operation.
2. method according to claim 1, it is characterised in that the operating load bag of the multi-joint unit of the detection freezer
Include：The running current of each compressor in the multi-joint unit of the freezer is detected, is sentenced according to the running current of each compressor
The operating load of the multi-joint unit of the disconnected freezer.
3. method according to claim 1 and 2, it is characterised in that the multi-joint unit of freezer detected described in the basis
Running status judge the multi-joint unit of the freezer whether in oil starvation state, including：
If detecting the multi-joint unit of the freezer to add up under conditions of operating load is less than or equal to default first load lower limit
The time of operation has reached default oil return detection time, then judge that the multi-joint unit of the freezer is in oil starvation state；With,
If detecting in default oil return detection time, the number of starts of the multi-joint machine set compressor of the freezer is more than or equal to pre-
If startup upper limit number of times, then judge the multi-joint unit of the freezer be in oil starvation state.
4. method according to claim 3, it is characterised in that also include：
Before the multi-joint unit execution oil return operation of the freezer is controlled, the accumulative run time is reset；
There is height after controlling the multi-joint unit execution oil return operation of the freezer and completing or performing before oil return operation is completed
When pressure unloading or high pressure hold mode, restart to add up the run time.
5. the method according to any one of claim 1-4, it is characterised in that the execution oil return operation includes：Close
Unloading magnetic valve, controlled loading magnetic valve is with Preset Time after periodically powering on；And/or increase the compressor of running status
Quantity, until the operating load of the multi-joint unit of the freezer reaches default second load lower limit.
6. the method according to any one of claim 1-5, it is characterised in that be additionally included in meet following condition arbitrarily it
For the moment, stop performing the oil return operation：
(1) power-off operation is carried out using switch, the switch includes hand switch, time switch or remote switch；
(2) the multi-joint unit of the freezer is in low-voltage variation holding state；
(3) quantity of the multi-joint unit of the freezer in the compressor of normal condition is numerically less than under default first load
Limit；
(4) the multi-joint unit of the freezer is in failsafe state, and the error protection includes high voltage protective, low-voltage variation, mistake
Current protection or the high protection of compressor winding temperature；
(5) time that continuously carries out of oil return operation reach default oil return run time threshold value.
7. the oil return control device of the multi-joint unit of a kind of freezer, it is characterised in that include：
Detection module, for detecting the running status of the multi-joint unit of freezer；The running status bag for detecting the multi-joint unit of freezer
Include：Detect the operating load of the multi-joint unit of the freezer and the number of starts of the multi-joint machine set compressor of the freezer；
Judge module, for judging that the multi-joint unit of the freezer is according to the running status of the multi-joint unit of the freezer for detecting
It is no in oil starvation state；
Oil return module, in the case of being in oil starvation state in the multi-joint unit of the freezer, controls the multi-joint unit of the freezer
Perform oil return operation.
8. device according to claim 7, it is characterised in that the detection module includes：
Operating load detector unit, for detecting the operating load of the multi-joint unit of the freezer；It is described to detect that the freezer is multi-joint
The operating load of unit includes：The running current of each compressor in the multi-joint unit of the freezer is detected, according to described each pressure
The running current of contracting machine judges the operating load of the multi-joint unit of the freezer；
Number of starts detector unit, for detecting the number of starts of the multi-joint machine set compressor of the freezer.
9. the device according to claim 7 or 8, it is characterised in that the judge module includes：
Operating load judging unit, is used for：If detecting the multi-joint unit of the freezer in operating load less than or equal to default the
The time for adding up operation under conditions of one load lower limit has reached default oil return detection time, then judge the freezer multi-connected machine
Group is in oil starvation state；
Number of starts judging unit, is used for：If detecting in default oil return detection time, the multi-joint unit compression of the freezer
The number of starts of machine then judges that the multi-joint unit of the freezer is in oil starvation state more than or equal to default startup upper limit number of times.
10. device according to claim 9, it is characterised in that the judge module includes timing unit, is used for：
Before the multi-joint unit execution oil return operation of the freezer is controlled, the accumulative run time is reset；
There is height after controlling the multi-joint unit execution oil return operation of the freezer and completing or performing before oil return operation is completed
When pressure unloading or high pressure hold mode, restart to add up the run time.
11. devices according to any one of claim 7-10, it is characterised in that the oil return module includes performing list
Unit, for closing unloading magnetic valve, controlled loading magnetic valve is with Preset Time after periodically powering on；And/or increase operation shape
The quantity of the compressor of state, until the operating load of the multi-joint unit of the freezer reaches default second load lower limit.
12. devices according to any one of claim 7-11, it is characterised in that the oil return module also includes exiting list
Unit, for meeting following condition arbitrarily for the moment, stops performing the oil return operation：
(1) power-off operation is carried out using switch, the switch includes hand switch, time switch or remote switch；
(2) the multi-joint unit of the freezer is in low-voltage variation holding state；
(3) quantity of the multi-joint unit of the freezer in the compressor of normal condition is numerically less than under default first load
Limit；
(4) the multi-joint unit of the freezer is in failsafe state, and the error protection includes high voltage protective, low-voltage variation, mistake
Current protection or the high protection of compressor winding temperature；
(5) time that continuously carries out of oil return operation reach default oil return run time threshold value.
A kind of multi-joint unit of 13. freezers, the oil return control with the multi-joint unit of freezer as any one of claim 7-12
Device processed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611069113.2A CN106642771A (en) | 2016-11-29 | 2016-11-29 | Oil return control method and device of refrigeration house multi-connected unit and refrigeration house multi-connected unit |
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| CN201611069113.2A CN106642771A (en) | 2016-11-29 | 2016-11-29 | Oil return control method and device of refrigeration house multi-connected unit and refrigeration house multi-connected unit |
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| CN106642771A true CN106642771A (en) | 2017-05-10 |
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| CN201611069113.2A Pending CN106642771A (en) | 2016-11-29 | 2016-11-29 | Oil return control method and device of refrigeration house multi-connected unit and refrigeration house multi-connected unit |
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| CN107990597A (en) * | 2017-10-25 | 2018-05-04 | 珠海格力电器股份有限公司 | Refrigeration system method for controlling oil return and device |
| CN108759205A (en) * | 2018-06-08 | 2018-11-06 | 广东美的暖通设备有限公司 | The method for controlling oil return of air-conditioning system and air-conditioning system, device |
| CN109084499A (en) * | 2018-08-15 | 2018-12-25 | 广东美的暖通设备有限公司 | Air conditioner oil return control method, air-conditioning and computer readable storage medium |
| CN110857809A (en) * | 2018-08-24 | 2020-03-03 | 青岛海尔空调器有限总公司 | Air conditioner and oil return control method thereof |
| CN111023416A (en) * | 2019-12-24 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Oil return control method and device and multi-split air conditioner |
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| CN113418327A (en) * | 2021-05-28 | 2021-09-21 | 青岛海尔空调电子有限公司 | Oil return control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113432343A (en) * | 2021-05-28 | 2021-09-24 | 青岛海尔空调电子有限公司 | Oil return control method of refrigeration and freezing unit and refrigeration and freezing unit |
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| CN111023416B (en) * | 2019-12-24 | 2021-08-24 | 宁波奥克斯电气股份有限公司 | Oil return control method and device and multi-split air conditioner |
| CN112032827A (en) * | 2020-08-28 | 2020-12-04 | 青岛海尔空调电子有限公司 | Oil return control method of multi-split air conditioning system |
| CN113418327A (en) * | 2021-05-28 | 2021-09-21 | 青岛海尔空调电子有限公司 | Oil return control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113432343A (en) * | 2021-05-28 | 2021-09-24 | 青岛海尔空调电子有限公司 | Oil return control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113432343B (en) * | 2021-05-28 | 2023-02-03 | 青岛海尔空调电子有限公司 | Oil return control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113418327B (en) * | 2021-05-28 | 2023-02-28 | 青岛海尔空调电子有限公司 | Oil return control method of refrigeration and freezing unit and refrigeration and freezing unit |
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Application publication date: 20170510 |