CN107033849A - A kind of preparation technology of absorption type core refrigerant composition - Google Patents
A kind of preparation technology of absorption type core refrigerant composition Download PDFInfo
- Publication number
- CN107033849A CN107033849A CN201710248618.3A CN201710248618A CN107033849A CN 107033849 A CN107033849 A CN 107033849A CN 201710248618 A CN201710248618 A CN 201710248618A CN 107033849 A CN107033849 A CN 107033849A
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- Prior art keywords
- refrigerant
- pressure
- solution
- absorption type
- type core
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
- C09K5/047—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for absorption-type refrigeration systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- 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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a cycle
-
- 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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/007—Details for charging or discharging refrigerants; Service stations therefor characterised by the weighing of refrigerant or oil
Abstract
The invention belongs to absorption type core technical field, and in particular to a kind of preparation technology of absorption type core refrigerant composition.The preparation technology is including step：1）Prepare refrigerant solution；2）Agitation Tank injects refrigerant solution；3）Movement adds refrigerant solution；Wherein, described refrigerant solution, as mass fraction, liquefied ammonia 33.8~35.6%, sodium chromate 2.86~3.75%, distilled water 60.65~63.34%.The present invention is in the step of absorption type core adds refrigerant solution, the vacuum of movement have selected 200Pa, under conditions of existing filing provision precision, effectively increase hydrogen mobility in movement container, ensure that absorption refrigerator refrigerating chamber performance under 43 degree of operating modes of high temperature is not higher than 6 degree, instead of and this requirement can be only achieved using the additional radiator fan technique of absorber in the prior art.
Description
Technical field
The invention belongs to absorption type core technical field, and in particular to a kind of preparation of absorption type core refrigerant composition
Technique.
Background technology
Absorption refrigerator has the distinguishing feature such as noiseless, environmentally friendly, long lifespan, multiple-energy-source, and it is without compressor, without fluorine profit
Hold high, without mechanical loss, and want to obtain higher refrigerating efficiency, not only to have rational structure, it is often more important that how to select
Optimal working medium and parameter.Research shows：Even if existing rational structure, if fluid properties choose improper, refrigerating efficiency can be very low,
Do not freeze even.
The property of binary solution is different from the property of neat liquid, when neat liquid evaporates at a given pressure, the temperature of evaporation
Degree immobilizes, and solution is when evaporating at a given pressure, if the timely fluid infusion that can not stablize, its concentration is with the liter of temperature
High and gradually reduce, the concentration of solute can also be reduced in evaporation.For example from ammonia solution, the ammonia density in evaporation will be reduced,
Refrigeration can be reduced gradually, and power consumption will increase.Therefore, if to increase refrigerating efficiency, it is necessary to improve in solution
The concentration of ammonia.But, solubility of the ammonia in water is again relevant directly with the concentration of ammonia solution.At a certain temperature, ammonia exists
Solubility in water is directly proportional to the pressure, and pressure will then be improved by improving concentration, but this is again by the working characteristics institute of the refrigeration system
Restriction.On the other hand, liquid concentration is improved, temperature can also be reduced, i.e., to substantially reduce the environment temperature for filling tank solution, and
Actual environment temperature again limit fill the temperature of tank solution can not be too low, otherwise can increase the gaseous phase partial pressure of ammonia in evaporator,
Reduce ammoniacal liquor evaporation rate in evaporator, so that refrigeration is reduced.
The gross pressure of system operatio is in diffusion absorption type refrigeration system it is considered that constant, operating pressure between each several part
Difference be only drag losses that liquid flows in the duct, but this loss in head very little, in analysis, calculate in can be neglected not
Meter.The numerical value of gross pressure is determined by filling pressure tank and operating temperature.And pressure tank is filled by ammonia partial pressure and hydrogen dividing potential drop two parts
Composition.After ammonia density is selected, ammonia partial pressure is determined that.System is filled pressure tank and just determined by the hydrogen amount added.When filling
Hydrogen amount too increases, although improve the diffusion velocity in system, but gross pressure is also improved, necessarily strong to the metal material of device
Degree has higher requirement, certainly will increase mass of system, complicated, and cost is improved.If above-mentioned unfavorable but system stagnation pressure is too low
Part thus can avoid, but the thing followed is the reduction for the amount of being flushed with hydrogen, and reduces the diffusion velocity in system.
In addition, the Composition Control of working medium is it will be apparent that even if each parameter is all optimal to its performance impact, but work
How many pairs of refrigerations of matter momentum also have large effect.Because the replenishment cycles of concentrated solution are to come real by hydrostatic potential difference pressure head
Existing.Working medium is filled less, it is meant that static pressure difference reduces, the concentrated solution in generator cannot be supplemented in time.Generator position it is dense
Solution concentration is gradually thinning, and the ammonia amount evaporated is reduced, and occurs temperature and increases, vapour content increases.Meanwhile, thermal siphon
Hoisting depth increase, cause refrigeration it is bad；Conversely, working medium fills many, refrigeration is also undesirable.Because supplementing the dynamic of concentrated solution
Power-hydrostatic head increase, concentrated solution supplement is too fast, and hoisting depth diminishes, and carries serious in lifting process secretly, destroys in riser
Flow regime, that is, destroy the slug flow of siphon pipe.
In the prior art, may be due to vacuum height under high temperature under worst hot case, container inner pressure is high, the stream of hydrogen
Dynamic property is poor so that the refrigeration poor-performing of absorption refrigerator.
The content of the invention
It is an object of the invention to asking for poor-performing is refrigerated under worst hot case for absorption refrigerator in the prior art
Inscribe and a kind of preparation technology of absorption type core refrigerant composition is provided.
The technical scheme realized the object of the invention and used for：A kind of preparation work of absorption type core refrigerant composition
Skill, the preparation technology includes step：1）Prepare refrigerant solution；2）Agitation Tank injects refrigerant solution；3）Movement adds refrigerant solution；
Wherein, described refrigerant solution, as mass fraction, liquefied ammonia 33.8~35.6%, sodium chromate 2.86~3.75%, distilled water
60.65~63.34%.
Technical scheme is preferable to carry out as the present invention one, described refrigerant solution, as mass fraction, liquefied ammonia 34.5%, chromium
Sour sodium 2.92%, distilled water 62.58%.
Technical scheme, the preparation refrigerant solution are preferable to carry out as the present invention one, its preparation steps is：1）Fluid reservoir is arranged
Gas；2）Refrigerator cools；3）Configure chromium acid sodium solution；4）Chromium acid sodium solution is evacuated into fluid reservoir to be well mixed；5）In fluid reservoir
Liquefied ammonia is injected, wherein, temperature is no more than 35 DEG C in control fluid reservoir and pressure inside the tank is no more than 0.2MPa.
Technical scheme is preferable to carry out as the present invention one, the Agitation Tank injects refrigerant solution, and its implantation step is：
1）The general supply of connection equipment is opened, liquid feeding system vacuum is observed, proceeds by and adds when vacuum reaches preset value
Liquid；
2）Open refrigerant：Refrigerant on Agitation Tank is switched and opened, refrigerant pressure table on observation refrigerant supercharging equipment, when refrigerant pressure
Power carries out liquid feeding when reaching preset value, while pressing refrigerant high pressure button, whether observation refrigerant high pressure is higher than refrigerant pressure；
3）Open gas cylinder switch：Gas cylinder switch is opened, required pressure is arrived into the regulation of gas Hydrogen Vapor Pressure, pressure is more than required pressure
Filling operation is just carried out during power, prevents refrigerant return into gas cylinder pipeline；
4）Into liquid feeding system, start Agitation Tank injection refrigerant solution.
Wherein, step 1）Described in liquid feeding system vacuum preset value be 0.02MPa, step 2）Described in refrigerant pressure
Preset value be 1.5~2.0MPa, step 3）Described in gas Hydrogen Vapor Pressure be not less than 2.4MPa.
Technical scheme is preferable to carry out as the present invention one, the movement adds refrigerant solution, and its implantation step is：
1）Liquid feeding electromechanical source, gas switch are opened, movement pressurize gas is discharged with liquid feeding handle；
2）Tape swapping tin valve plug, weighs together with movement, zero setting；
3）Valve plug is loaded in valve pocket, valve plug is opened with liquid feeding handle, liquid volume added is inputted, liquid filler joint and liquid feeding handle are connected
Connect；
4）The filling button in inflator head is clicked, is vacuumized and is acted with filling；
5）The gas charge button pressed in inflator head is not put, and observes gas gauge, when display pressure reaches requirement filling
During pressure value, button actions are pressed in release button, repetition, and gas meter is injected in observation, and whether confirmation filling gas pressure reaches will
Ask；
6）Electronic scale display screen is watched, confirms the ammoniacal liquor weight of filling in control range；
7）Liquid feeding valve core is locked, liquid feeding handle is removed, is tightened with torque wrench.
Wherein, step 4）In, movement is vacuumized and concretely comprised the following steps with filling：First click filling in inflator head by
Button, machine vacuumize for the first time, and when movement internal vacuum is to 1000Pa, machine is vacuumized for the second time, is evacuated to
Machine stops vacuumizing during 200Pa, carries out filling ammoniacal liquor.
The technical effects of the invention are that：
1）The vacuum of movement is evacuated to by the present invention during absorption type core adds refrigerant solution by secondary vacuum pumping
200Pa, under conditions of existing filing provision precision, effectively increases hydrogen mobility in movement container, it is ensured that absorption
Refrigerator refrigerating chamber performance under 43 degree of operating modes of high temperature is not higher than 6 degree, instead of and uses the additional radiation air of absorber in the prior art
Fan technique can be only achieved this requirement.
2）The present invention improves the mobility of movement internal hydrogen under worst hot case, and then improves the diffusion model of high-purity liquefied ammonia
Enclose, refrigerator cold-storage is reached optimum efficiency at high temperature.
3）The refrigerant solution that the present invention is prepared, has taken into full account that ammoniacal liquor easily resolves into H after mixing2O and NH3, cause ammoniacal liquor
Each component sodium chromate, distilled water, liquefied ammonia in change in concentration and the influence for causing refrigerant performance, the refrigerant solution that the present invention is configured
Well mixed, injection purity is than more consistent.
Brief description of the drawings
Fig. 1 is the mean temperature graph of a relation under the different vacuums of 43 degree of operating mode refrigerating boxes.
Fig. 2 is the mean temperature graph of a relation under the different vacuums of 25 degree of operating mode household freezers.
Embodiment
The present invention is described further with reference to embodiment.
A kind of preparation technology of absorption type core refrigerant composition of the present invention, including preparation process：1）Prepare refrigerant molten
Liquid；2）Agitation Tank injects refrigerant solution；3）Movement adds refrigerant solution；Described refrigerant solution, as mass fraction, liquefied ammonia
33.8~35.6%, sodium chromate 2.86~3.75%, distilled water 60.65~63.34%.
Most preferably refrigerant solution of the invention, as mass fraction, liquefied ammonia 34.5%, sodium chromate 2.92%, distilled water
62.58%。
The preparation technology of absorption type core refrigerant composition of the present invention, specific preparation process is as follows：
（One）Prepare refrigerant solution：
1）Fluid reservoir top vent valve is opened, air pressure in fluid reservoir is closed valve after being in standard atmospheric pressure；
2）Check whether each joint of tubing is solid and reliable, forbids have loosening, leakage phenomenon；
3）Refrigerator battery main switch is opened successively, and the temperature of refrigerator itself is down to less than 5 degree by refrigerator switch；
4）The sodium chromate for accounting for refrigerant solution 2.92% is poured into water container, uniform stirring after distilled water to be added；
5）The distilled water for accounting for refrigerant solution 62.58% is poured into uniform stirring in water container, chromium acid sodium solution is made；
6）Pump switch and water inlet valve are opened, and checks whether other valves close, chromium acid sodium solution is evacuated to fluid reservoir
In, close valve after the chromium acid sodium solution of matched somebody with somebody proportion is all evacuated in fluid reservoir；
7）Valve and fluid reservoir display tube upper end valve are opened, makes pot liquid circulation, sodium chromate is uniformly blended in
In liquid；
8）Raw material band, and Screw joint are sticked on liquefied ammonia bottle neck, by one end jointing of liquid ammonia tube, and the set that is tightened；
9）Liquefied ammonia bottle valve and fluid reservoir upper end liquefied ammonia valve are turned on, liquefied ammonia is slowly injected in fluid reservoir（Total proportion shared by liquefied ammonia
For 34.5%）Liquefied ammonia injection rate passes through electronic scale control；
10）When temperature slowly rises in fluid reservoir, coolant valve and Control of Chiller panel charging pump compressor button are opened.
When in tank temperature more than 35 degree or during pressure >=0.2MPA, must temporary close liquefied ammonia bottle valve, stop filling liquefied ammonia.Open liquid storage
Tank top air pressure valve or cooling-water machine cooling method fall pressure, then carry out filling operation.
11）After the completion of liquefied ammonia injection, close liquefied ammonia bottle and fluid reservoir upper end liquefied ammonia valve and unload liquefied ammonia sebific duct, liquefied ammonia
Bottle is placed into determined location.
12）When temperature drop is to 10~15 DEG C or so in fluid reservoir, close cycle button and cold air on cooling-water machine control panel,
Total power button, way circuit switch.
13）Switch off the pump switch and each valve.
（Two）Agitation Tank injects refrigerant solution：
The Agitation Tank injects refrigerant solution, and it includes the start of injection refrigerant implanter and refrigerant implanter two steps of shutdown.
Refrigerant implanter start step is：
1）The general supply of connection equipment is opened, liquid feeding system vacuum is observed, vacuum will reach that preset value 0.02MPa can just enter
Row liquid feeding.
2）Open refrigerant：Refrigerant on Agitation Tank is switched and opened, refrigerant pressure table, pressure on observation refrigerant supercharging equipment
Between 1.5~2.0Mpa just can liquid feeding, while to press refrigerant high pressure button, whether observation refrigerant high pressure is higher than refrigerant pressure
Power.
3）Open gas cylinder switch：Gas cylinder switch is opened, required pressure is arrived into gas pressure regulation, it is necessary to first open gas cylinder
Switch, when pressure is more than required pressure（6 cubes of movement Hydrogen Vapor Pressure 2.4MPa）, filling operation can be just carried out, refrigerant is prevented
It is back in gas cylinder pipeline.
4）Open computer and enter software liquid feeding system, the green button is starts, and red button is to stop.
The refrigerant implanter shutdown procedures are：
1）Stop liquid feeding, press red button.
2）Close the general supply of connection equipment.
3）Close refrigerant：The refrigerant switch closed on Agitation Tank.
4）Close gas：Close gas switch.
（Three）The movement adds refrigerant solution：
1）Liquid feeding electromechanical source, gas switch are opened, movement pressurize gas is discharged with liquid feeding handle.
2）Tape swapping tin valve plug, weighs together with movement, zero setting.
3）Valve plug is loaded in valve pocket, valve plug is opened with liquid feeding handle, liquid volume added is inputted（Display interface is operated）.Liquid filler is connect
On head and the connection of liquid feeding handle.
4）The green filling button in inflator head is clicked, is vacuumized and is acted with filling, by the extraction vacuum of movement
Degree is set to 0.02MPa.
5）Press the filling button of the green gases in inflator head not put, observe gas gauge, wanted when display pressure reaches
When seeking the pressure value of filling, button actions are pressed in release button, repetition, and observation injection gas meter confirms that filling gas pressure is
It is no to reach requirement.
6）Watching electronic scale display screen confirms the ammoniacal liquor weight of filling in control range.
7）Liquid feeding valve core is locked, liquid feeding handle is removed, is tightened with torque wrench.
The absorption type core that the refrigerant solution of most preferred embodiment configuration of the present invention will be filled with is tested.Fig. 1 is 43
Mean temperature graph of a relation of the operating mode refrigerating box under different vacuums is spent, it can be found that：Absorption type core vacuum is lower, its property
Can be better.Preferably movement vacuum of the invention is 200Pa, and it meets use requirement well：43 degree of operating mode refrigerating box requirements
Refrigerated case temperature is not higher than 6 degree.
But found in actual production process, when movement vacuum is less than 200Pa, it is suitable to filing provision required precision
Height, the pumpdown time is long, has had a strong impact on production efficiency, especially, when movement vacuum is 80Pa, refrigerating box performance
Also improved without any.
Fig. 2 is mean temperature graph of a relation of 25 degree of operating mode household freezers under different vacuums, it is seen that when vacuum is 80Pa
When, absorption refrigerator household freezer slightly inferior properties.Therefore, in preparation technology of the invention, preferably movement vacuum is 200Pa.
To sum up, the refrigerant solution selected by the present invention, preferably movement vacuum are 200Pa, are applied in absorption type core
In after, its preferably meet in actually required requirement, alternative currently available technology use the additional radiator fan technique of absorber
It can be only achieved this requirement.
In particular, in the step of configuring refrigerant solution, described refrigerant solution also can be according to the following formulation
Amount configuration：As mass fraction, liquefied ammonia 33.8%, sodium chromate 2.86%, distilled water 63.34%；Or liquefied ammonia 35.6%, sodium chromate
3.75%, distilled water 60.65%.The change made under other any Spirit Essences and principle without departing from the present invention, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, are included within protection scope of the present invention.
Claims (8)
1. a kind of preparation technology of absorption type core refrigerant composition, including preparation process：1）Prepare refrigerant solution；2）With liquid
Tank injects refrigerant solution；3）Movement adds refrigerant solution；It is characterized in that：Described refrigerant solution, as mass fraction, liquefied ammonia
33.8~35.6%, sodium chromate 2.86~3.75%, distilled water 60.65~63.34%.
2. the preparation technology of absorption type core refrigerant composition according to claim 1, it is characterised in that：Described is cold
Matchmaker's solution, as mass fraction, liquefied ammonia 34.5%, sodium chromate 2.92%, distilled water 62.58%.
3. the preparation technology of absorption type core refrigerant composition according to claim 1 or 2, it is characterised in that：It is described
Refrigerant solution, its preparation steps is：1）Fluid reservoir is vented；2）Refrigerator cools；3）Configure chromium acid sodium solution；4）By sodium chromate
Solution is evacuated to fluid reservoir and is well mixed；5）Injection liquefied ammonia in fluid reservoir.
4. the preparation technology of absorption type core refrigerant composition according to claim 3, it is characterised in that：In step 5）
In, temperature is no more than 35 DEG C in control fluid reservoir and liquid storage pressure inside the tank is no more than 0.2MPa.
5. the preparation technology of absorption type core refrigerant composition according to claim 1, it is characterised in that：It is described to match somebody with somebody liquid
Tank injects refrigerant solution, and its implantation step is：
The general supply of connection equipment is opened, liquid feeding system vacuum is observed, liquid feeding is proceeded by when vacuum reaches preset value；
Open refrigerant：Refrigerant on Agitation Tank is switched and opened, refrigerant pressure table on observation refrigerant supercharging equipment works as refrigerant pressure
Liquid feeding is carried out when reaching preset value, while pressing refrigerant high pressure button, whether observation refrigerant high pressure is higher than refrigerant pressure；
Open gas cylinder switch：Gas cylinder switch is opened, required pressure is arrived into the regulation of gas Hydrogen Vapor Pressure, pressure is more than required pressure
When just carry out filling operation, prevent refrigerant return into gas cylinder pipeline；
Into liquid feeding system, start Agitation Tank injection refrigerant solution.
6. the preparation technology of absorption type core refrigerant composition according to claim 5, it is characterised in that：Step 1）In
The preset value of the liquid feeding system vacuum is 0.02MPa, step 2）Described in refrigerant pressure preset value for 1.5~
2.0MPa, step 3）Described in gas Hydrogen Vapor Pressure be not less than 2.4MPa.
7. the preparation technology of absorption type core refrigerant composition according to claim 1, it is characterised in that：The movement
Refrigerant solution is added, its implantation step is：
Liquid feeding electromechanical source, gas switch are opened, movement pressurize gas is discharged with liquid feeding handle；
Tape swapping tin valve plug, weighs together with movement, zero setting；
3）Valve plug is loaded in valve pocket, valve plug is opened with liquid feeding handle, liquid volume added is inputted, liquid filler joint and liquid feeding handle are connected
Connect；
4）The filling button in inflator head is clicked, is vacuumized and is acted with filling；
5）The gas charge button pressed in inflator head is not put, and observes gas gauge, when display pressure reaches requirement filling
During pressure value, button actions are pressed in release button, repetition, and gas meter is injected in observation, and whether confirmation filling gas pressure reaches will
Ask；
6）Electronic scale display screen is watched, confirms the ammoniacal liquor weight of filling in control range；
7）Liquid feeding valve core is locked, liquid feeding handle is removed, is tightened with torque wrench.
8. the preparation technology of absorption type core refrigerant composition according to claim 7, it is characterised in that：Step 4）
In, movement is vacuumized and concretely comprised the following steps with filling：The filling button in inflator head is first clicked, machine take out for the first time
Vacuum, when movement internal vacuum is to 1000Pa, machine is vacuumized for the second time, and machine stops taking out true when being evacuated to 200Pa
Sky, carries out filling ammoniacal liquor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248618.3A CN107033849A (en) | 2017-04-17 | 2017-04-17 | A kind of preparation technology of absorption type core refrigerant composition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248618.3A CN107033849A (en) | 2017-04-17 | 2017-04-17 | A kind of preparation technology of absorption type core refrigerant composition |
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| Publication Number | Publication Date |
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| CN107033849A true CN107033849A (en) | 2017-08-11 |
Family
ID=59535383
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Address after: 215513 Haicheng Industrial Park, Xingda Road, Changshu Economic and Technological Development Zone, Suzhou City, Jiangsu Province, No. 9 Applicant after: Setford (Changshu) Refrigeration Equipment Co., Ltd. Address before: 215513 Haicheng Industrial Park, Xingda Road, Changshu Economic and Technological Development Zone, Suzhou City, Jiangsu Province, No. 9 Applicant before: Tai Meida Electrical Appliances Co., Ltd of Suzhou City |
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Application publication date: 20170811 |
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