CN106321440B - The control method of compressor, electric refrigerator and compressor - Google Patents
The control method of compressor, electric refrigerator and compressor Download PDFInfo
- Publication number
- CN106321440B CN106321440B CN201610905334.2A CN201610905334A CN106321440B CN 106321440 B CN106321440 B CN 106321440B CN 201610905334 A CN201610905334 A CN 201610905334A CN 106321440 B CN106321440 B CN 106321440B
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- compressor
- threshold
- detector unit
- temperature
- upper flange
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 26
- 235000003642 hunger Nutrition 0.000 claims abstract description 21
- 230000037351 starvation Effects 0.000 claims abstract description 21
- 239000003921 oil Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000010725 compressor oil Substances 0.000 claims description 8
- 238000005461 lubrication Methods 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses the control methods of a kind of compressor, electric refrigerator and compressor, belong to compressor and its control method technical field, are designed to solve the problems such as existing method is of high cost.Compressor of the present invention includes upper flange, stator winding and control device, detector unit is provided at the axle journal of upper flange and/or in stator winding, detector unit signal is connected to control device.Whether the control method of compressor of the present invention judges whether oil starvation is run compressor more than threshold value for the temperature value at axle journal by detecting upper flange and/or in stator winding.The control method of compressor of the present invention, electric refrigerator and compressor can judge whether oil starvation is run compressor, and at low cost, applied widely, range and measurement accuracy are guaranteed instead of existing fuel level sensor；Using safer, service life is longer.
Description
Technical field
The present invention relates to compressor and its control method technical field more particularly to a kind of compressor, including the compressor
Electric refrigerator and control method based on above-mentioned compressor.
Background technology
Inside the compressor of the electric refrigerators such as air-conditioning, refrigerator, heat can be constantly generated during the work time.Operating mode is more severe
When compressor rotating speed will be higher, internal multiple contact surface high-speed frictions and then generate huge heat, be easy to cause axis
Or the parts such as flange are seriously worn；Refrigerant or refrigeration oil are influenced that qualitative change can occur by high temperature, so as to influence overall performance
And reliability；The higher motor load of rotating speed is bigger, electric current is bigger, fever is more serious, easily causes motor demagnetization and even burns, can
The serious accidents such as explosion can be triggered.
In order to avoid because causing to generate substantial amounts of heat during friction, existing compressor need to usually be equipped with fuel level sensor, utilize
Fuel level sensor is to determine whether oil starvation is run.Unit operation oil return frequency, frequency reducing or shutdown are controlled if oil starvation.This method
Defect is：The range and precision of fuel level sensor are limited, and cost is higher, can not extensive use within the compressor.
The content of the invention
An object of the present invention is to provide a kind of compressors at low cost, measuring accuracy is high.
It is another object of the present invention to propose a kind of electric refrigerator of service life length.
The present invention's further an object is that propose a kind of pressure for substituting existing directly measurement abnormal point physical parameter mode
The control method of contracting machine.
For this purpose, on the one hand, the present invention uses following technical scheme：
A kind of compressor, including upper flange, stator winding and control device, at the axle journal of the upper flange and/or institute
It states and detector unit is provided in stator winding, the detector unit signal is connected to the control device.
Particularly, counterbore is provided on the lateral surface of the axle journal of the upper flange, the detector unit is arranged on
In the counterbore；The distance between upper end of the counterbore and the upper flange is at 0.3 times to 0.5 times of upper flange axle journal height
Between.
Further, it is arranged in the counterbore filled with binding agent, the detector unit in the binding agent.
Particularly, the detector unit by wire transmission, be wirelessly transferred or be loaded into transmission side in forceful electric power cable
Formula realization is connected with the signal of the control device.
Further, when the detector unit is connected by wire transmission mode with the control device signal,
Through hole is provided on the housing of compressor, sealing plate is provided in the through hole, binding post is inserted in the sealing plate, it is described
Binding post is connected to the detector unit by wiring.
Further, be provided with boss on the lateral surface of the sealing plate, the through hole along its axis direction in step-like,
The boss is located on the medial surface or lateral surface of the housing.
On the other hand, the present invention uses following technical scheme：
A kind of electric refrigerator, including above-mentioned compressor.
Further aspect, the present invention use following technical scheme：
A kind of control method based on above-mentioned compressor, the control method at axle journal by detecting upper flange and/
Or the temperature value in the stator winding whether more than threshold value come judge compressor whether oil starvation run.
Particularly, first threshold is provided with, is determined as that compressor lubrication is normal when temperature is less than the first threshold, institute
It states compressor and continues to execute current operation mode；It is determined as the compressor oil starvation fortune when temperature is higher than the first threshold
Row, controls the compressor shutdown.
Particularly, first threshold and second threshold are provided with, the first threshold is less than the second threshold；When temperature is low
It is determined as that compressor lubrication is normal when the first threshold, the compressor continues to execute current operation mode；When temperature height
In the first threshold and during less than the second threshold, the compressor is controlled to keep present load load or turn by reducing
Speed makes the oil return frequency of the load decline or runtime so that refrigeration oil returns to the compressor；When temperature is higher than
It is determined as the compressor oil starvation operation during second threshold, controls the compressor shutdown.
Compressor of the present invention is provided with detector unit, Ke Yidai at the axle journal of upper flange and/or in stator winding
Judge whether oil starvation is run compressor, and at low cost, applied widely, range and measurement accuracy have guarantor for existing fuel level sensor
Card；Judge whether motor overheats, judges whether motor overloads or occur stall by stator winding temperature detection, and then take
Measure avoids compressor motor overheating generation explosion accident on fire；Using safer, service life is longer.
Temperature value at axle journal of the control method of compressor of the present invention by detecting upper flange and/or in stator winding is
It is no to judge whether oil starvation is run compressor, i.e., logical overtemperature reflects that the abnormal point of compressor (is predominantly compressed more than threshold value
The core components such as the flange and motor of machine), instead of the mode of the existing physical parameter for directly measuring abnormal point, compression can be controlled
Machine system operation avoids compressor from being damaged or destroyed in safety zone and frequency range, improves the permanent reliable of compressor
Property.
Description of the drawings
Fig. 1 is the sectional view for the compressor that the preferred embodiment of the present invention one provides；
Fig. 2 is the partial enlarged view at A in Fig. 1；
Fig. 3 is the partial enlarged view at B in Fig. 1；
Fig. 4 is the structure diagram of sealing plate and second of fit system of housing that the preferred embodiment of the present invention one provides.
In figure：
1st, upper flange；2nd, stator winding；3rd, detector unit；4th, binding agent；5th, housing；6th, sealing plate；7th, binding post；
8th, wiring；11st, counterbore；51st, through hole；61st, boss.
Specific embodiment
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Preferred embodiment one：
This preferred embodiment discloses a kind of compressor, as depicted in figs. 1 and 2, the compressor include upper flange 1, stator around
Group 2 and control device are provided with detector unit 3 at the axle journal of upper flange 1, temperature inspection are provided in stator winding 2
It surveys element 3 or detector unit 3 is both provided at the axle journal of upper flange 1 and in stator winding 2, detector unit 3 is believed
Number it is connected to control device.
The necked part of upper flange 1 is not immersed in lubricating oil under normal circumstances, can be fast when rubbing with crankshaft high-speed
Speed generates substantial amounts of heat, if compressor oil drainage rate is excessive or oil-way lubrication effect difference if easily cause the axle journal position of upper flange 1
Place's oil starvation operation is put, so as to unstable wear, causes position seals failure, crankshaft breakdown or compressor damage etc. expendable
Failure.By detecting and monitoring the temperature of the upper flange in compression case body, electric machine assembly etc., can realize inside compressor
Early warning/warning function finds whether oil starvation is run compressor in time, and then improves system control strategy in time to reach protection pressure
Contracting machine is permanent on safe operating area and frequency range, reliably runs, and reduces the probability that compressor breaks down.
The control method of the compressor is to be by detecting the temperature value at the axle journal of upper flange 1 and/or in stator winding 2
It is no more than threshold value come judge compressor whether oil starvation run, unit can be adopted after judging that compressor is in oil starvation operating status
Take control measure.The control measure are intended to protection unit, include but not limited to frequency reducing, operation oil return frequency, standby and shutdown.
During temperature value at the axle journal for only detecting upper flange 1 or in stator winding 2, the temperature value and threshold value is used to carry out
Compare；When the temperature value in the temperature value and stator winding 2 detected simultaneously at the axle journal of upper flange 1, two temperature values difference
Can judge compressor oil starvation fortune when any of which temperature value is more than threshold value compared with corresponding threshold value
Row can also be that two temperature values just judge the operation of compressor oil starvation when being above threshold value.When the axle journal for detecting upper flange 1 simultaneously
During temperature value in the temperature value and stator winding 2 at place, the threshold value corresponding to two temperature values can be the same or different.
Number of thresholds corresponding to each temperature value is unlimited, can only set a threshold value, can also include at least two
Threshold value, threshold values quantity number according to system control speed, efficiency and effect and specifically determine.Threshold values quantity is more at most by threshold values
Mark off that the region quantity come is more, it will to the control logic of the selecting of threshold values, the judgement of current set state and controller
Higher is sought, the operating mode that compressor can perform is also more.
The specific mounting means of detector unit 3 is unlimited, it is preferred that is set on the lateral surface of the axle journal of upper flange 1
There is counterbore 11, detector unit 3 is arranged in counterbore 11.In view of lubricant effect at the more upward position of the axle journal of upper flange 1
It is more tested, so 0.3 times to 0.5 times in upper flange axle journal height of the distance between upper end of counterbore 11 and upper flange 1
Between.11 bottom of counterbore need to be not less than 1mm with distance of round in upper flange, ensure the reliability of upper flange inner circle intensity.
Filled with binding agent 4 in counterbore 11, detector unit 3 be arranged in binding agent 4 (can also by welding and
The modes fixed temperature detection elements 3 such as binding).The species of detector unit 3 includes but not limited to thermocouple and thermal resistance, uses
Temperature in 11 bottom of detection counterbore；Binding agent 4 needs the characteristic with high temperature resistant, resistance to refrigerant and refrigeration oil corrosion, uses
It is firmly sticked in by detector unit 3 in counterbore 11.The induction part of detector unit 3 should connect with 11 bottom of counterbore
It touches, to detect the temperature closest to upper flange inner circle, ensures that testing result is more accurate.
In view of the temperature inside stator winding 2 is generally significantly higher than the temperature of its outer surface, therefore in stator winding 2
Detector unit 3 must go deep into the inside of winding coil or during the wire winding of stator winding 2 is made in advance by temperature
Degree detecting element 3 is placed in one.
Detector unit 3 by wire transmission, be wirelessly transferred or be loaded into forceful electric power cable transmission mode and realize and control
The signal connection of device processed.
When detector unit 3 is connected by wire transmission mode with control device signal, on the housing 5 of compressor
Through hole 51 is provided with, sealing plate 6 is provided in through hole 51, binding post 7 is inserted in sealing plate 6, binding post 7 is connected by wiring 8
It is connected to detector unit 3.
The material of different sealing plate 6 in practical application, the connection mode between housing 5 can not also be same,
Including but not limited to welding, end face seal, axial seal and chemical gluing.The quantity of binding post 7 will according to number of signals
Depending on asking；Sealing is preferably realized using artistic glass sintering between binding post 7 and sealing plate 6；Between binding post 7 and sealing plate 6
By the vitreum isolated insulation of high impedance, insulation impedance value need to reach do not influence shallow temperature signal transmission standard it is (general
At 1k megohms or more), while vitreum sintering process must reach the high pressure resistant and high temperature resistant requirement as housing 5.
As shown in Figure 3 and Figure 4, there are mainly two types of the fit systems of sealing plate 6 and housing 5, set on the lateral surface of sealing plate 6
Be equipped with boss 61, through hole 51 along its axis direction in step-like, boss 61 be located on the lateral surface of housing 5 (as shown in Figure 3) or
On medial surface (as shown in Figure 4).Structure fabrication process shown in Fig. 3 is simple, but leakproofness does not have the structure shown in Fig. 4 good；By
It is acted in by internal pressure, respective outer side edges mode shown in Fig. 4 is more secured, but the processing technology of interior step is slightly complicated.
In the control method of the compressor, first threshold can be only set, be determined as when temperature is less than first threshold
Compressor lubrication is normal, and compressor continues to execute current operation mode；It is determined as that compressor lacks when temperature is higher than first threshold
Oil operation, controls compressor shutdown.
First threshold and second threshold can also be set simultaneously, wherein, first threshold is less than second threshold (such as the first threshold
It is worth for 180 DEG C, second threshold is 230 DEG C).It is determined as that compressor lubrication is normal (in normal when temperature is less than first threshold
Operation area), parts normal work, in this region, inner compressor frequency is not limited, and raising frequency or can adjust other mechanisms
Make unit Effec-tive Function, i.e. compressor continues to execute current operation mode.
Being loaded when temperature is higher than first threshold and is less than second threshold can not continue to improve, and control compressor is kept currently
Load or by reduce rotating speed make load decline or the oil return frequency of runtime so that refrigeration oil return compression
Machine, compressor and freeze oil increase, and so as to enhance lubricant effect, make the temperature of temperature anomaly position reduce.
It is determined as that compressor oil starvation is run when temperature is higher than second threshold, in order to ensure the safety of compressor, controller
Stopping signal should be sent, avoids continuing to start shooting causing compressor damage or damage.
Preferred embodiment two：
This preferred embodiment discloses a kind of electric refrigerator, including the compressor as described in preferred embodiment one.Refrigeration electricity
Device can be but be not limited to air-conditioning and refrigerator；Wherein, compressor can be but be not limited to single-stage single cylinder roller, multistage more
The products such as cylinder, vortex, linear, rotary cylinder type, piston type and screw compressor.
Note that the technical principle that above are only presently preferred embodiments of the present invention and used.Those skilled in the art can manage
Solution, the invention is not restricted to specific embodiments described here, can carry out various apparent changes for a person skilled in the art
Change, readjust and substitute without departing from protection scope of the present invention.Therefore, although by above example to the present invention into
It has gone and has been described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept,
It can also include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of compressor, including upper flange (1), stator winding (2) and control device, which is characterized in that in the upper flange
(1) detector unit (3), detector unit (3) letter are provided at axle journal and/or in the stator winding (2)
Number the control device is connected to,
When the detector unit (3) are provided at the axle journal, the detector unit (3) is used to detect and monitor
The temperature of the upper flange (1), to judge whether oil starvation is run compressor；It is examined when being provided with temperature in the stator winding (2)
When surveying element (3), the detector unit (3) is used to detect and monitor the temperature of the stator winding (2), to judge to compress
Whether oil starvation is run machine.
2. compressor according to claim 1, which is characterized in that set on the lateral surface of the axle journal of the upper flange (1)
Counterbore (11) is equipped with, the detector unit (3) is arranged in the counterbore (11)；The counterbore (11) and the upper flange
(1) the distance between upper end is between 0.3 times to 0.5 times of upper flange axle journal height.
3. compressor according to claim 2, which is characterized in that filled with binding agent (4), institute in the counterbore (11)
Detector unit (3) is stated to be arranged in the binding agent (4).
4. compressor according to any one of claims 1 to 3, which is characterized in that the detector unit (3) is by having
Line transmits, is wirelessly transferred or is loaded into transmission mode realization in forceful electric power cable and is connected with the signal of the control device.
5. compressor according to claim 4, which is characterized in that when the detector unit (3) passes through wire transmission
When mode is connected with the control device signal, through hole (51) is provided on the housing (5) of compressor, the through hole (51) is interior
Sealing plate (6) is provided with, is inserted with binding post (7) in the sealing plate (6), the binding post (7) is connected to by wiring (8)
The detector unit (3).
6. compressor according to claim 5, which is characterized in that be provided with boss on the lateral surface of the sealing plate (6)
(61), the through hole (51) is in step-like along its axis direction, and the boss (61) is located at the medial surface or outer of the housing (5)
On side.
7. a kind of electric refrigerator, which is characterized in that including such as claim 1 to 6 any one of them compressor.
A kind of 8. control method based on any one of claim 1 to 6 compressor, which is characterized in that the control method
Whether judge to press more than threshold value for temperature value at the axle journal by detecting upper flange (1) and/or in the stator winding (2)
Whether oil starvation is run contracting machine.
9. the control method of compressor according to claim 8, which is characterized in that first threshold is provided with, when temperature is low
It is determined as that compressor lubrication is normal when the first threshold, the compressor continues to execute current operation mode；When temperature height
It is determined as the compressor oil starvation operation when first threshold, controls the compressor shutdown.
10. the control method of compressor according to claim 8, which is characterized in that be provided with first threshold and the second threshold
Value, the first threshold are less than the second threshold；
It is determined as that compressor lubrication is normal when temperature is less than the first threshold, the compressor continues to execute work at present mould
Formula；When temperature is higher than the first threshold and is less than the second threshold, the compressor is controlled to keep present load load
Or make the oil return frequency of the load decline or runtime so that refrigeration oil returns to the compression by reducing rotating speed
Machine；It is determined as the compressor oil starvation operation when temperature is higher than the second threshold, controls the compressor shutdown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610905334.2A CN106321440B (en) | 2016-10-18 | 2016-10-18 | The control method of compressor, electric refrigerator and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610905334.2A CN106321440B (en) | 2016-10-18 | 2016-10-18 | The control method of compressor, electric refrigerator and compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106321440A CN106321440A (en) | 2017-01-11 |
| CN106321440B true CN106321440B (en) | 2018-06-01 |
Family
ID=57817762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610905334.2A Active CN106321440B (en) | 2016-10-18 | 2016-10-18 | The control method of compressor, electric refrigerator and compressor |
Country Status (1)
| Country | Link |
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| CN (1) | CN106321440B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519372B (en) * | 2017-09-19 | 2024-01-23 | 谷轮环境科技（苏州）有限公司 | One-way bearing assembly, oil brake device and scroll compressor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1696506A (en) * | 2004-05-13 | 2005-11-16 | 松下电器产业株式会社 | Hermetic compressors and refrigeration units |
| CN103560621A (en) * | 2013-11-25 | 2014-02-05 | 苏州贝得科技有限公司 | Assembly type sealing terminal assembly of closed type refrigeration motor temperature sensing element |
| CN206206167U (en) * | 2016-10-18 | 2017-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and electric refrigerator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001012351A (en) * | 1999-06-24 | 2001-01-16 | Daikin Ind Ltd | Hermetic compressor and refrigeration apparatus including the same |
| JP2003083258A (en) * | 2001-09-05 | 2003-03-19 | Mitsubishi Electric Corp | Hermetic compressor |
-
2016
- 2016-10-18 CN CN201610905334.2A patent/CN106321440B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1696506A (en) * | 2004-05-13 | 2005-11-16 | 松下电器产业株式会社 | Hermetic compressors and refrigeration units |
| CN103560621A (en) * | 2013-11-25 | 2014-02-05 | 苏州贝得科技有限公司 | Assembly type sealing terminal assembly of closed type refrigeration motor temperature sensing element |
| CN206206167U (en) * | 2016-10-18 | 2017-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and electric refrigerator |
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| Publication number | Publication date |
|---|---|
| CN106321440A (en) | 2017-01-11 |
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Effective date of registration: 20190103 Address after: 519070, Jinji Hill Road, front hill, Zhuhai, Guangdong Co-patentee after: GREE GREEN REFRIGERATION TECHNOLOGY CENTER Co.,Ltd. OF ZHUHAI Patentee after: GREE ELECTRIC APPLIANCES,Inc.OF ZHUHAI Address before: 519070 science and technology building, 789 Jinji Road, Qianshan, Zhuhai, Guangdong Patentee before: GREE GREEN REFRIGERATION TECHNOLOGY CENTER Co.,Ltd. OF ZHUHAI |