CN109354227A - Water purification system and water purifier - Google Patents
Water purification system and water purifier Download PDFInfo
- Publication number
- CN109354227A CN109354227A CN201811200348.XA CN201811200348A CN109354227A CN 109354227 A CN109354227 A CN 109354227A CN 201811200348 A CN201811200348 A CN 201811200348A CN 109354227 A CN109354227 A CN 109354227A
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- Prior art keywords
- water
- water purification
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- flow
- guiding structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 213
- 238000000746 purification Methods 0.000 title claims abstract description 94
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 56
- 239000012528 membrane Substances 0.000 claims abstract description 45
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000001223 reverse osmosis Methods 0.000 claims description 36
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 238000001728 nano-filtration Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 6
- 238000005374 membrane filtration Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 2
- 238000005406 washing Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The application relates to a water purification system and water purifier includes: the pretreatment unit comprises an ultrafiltration filter element; the ultrafiltration membrane of the ultrafiltration filter core is a washable ultrafiltration membrane; the water inlet of the ultrafiltration filter element is arranged to be of a spray type structure. On the milipore filter of well ultrafiltration filter core with pretreatment units sets up the basis into flushable milipore filter, the department of intaking of ultrafiltration filter core sets up to fountain structure, when using the water purification system of this application to carry out the water purification, because the existence of fountain structure, when the raw water enters, the shearing force can increase, can increase the impact of milipore filter, and, the membrane silk intensity that can wash the milipore filter is great, can bear the dynamics of washing, therefore, the magazine of the milipore filter raw water side of intaking just is difficult to adhere to on the milipore filter, the worry effect that can guarantee the milipore filter basically maintains unchangeably, the cycle of changing the ultrafiltration filter core has been prolonged, the life of water purification system has been prolonged.
Description
Technical field
This application involves technical field of water purification more particularly to a kind of water purification system and water purifiers.
Background technique
As the improvement of people's living standards, the requirement to quality of life is also higher and higher, due to present water pollution problems
More serious, therefore, people increasingly focus on quality problem.
The water of preferable water quality in order to obtain is generally filtered water using water purification system, and existing water purification system is general
Raw water is pre-processed using ultra filtration unit, then carries out secondary treatment to by pretreated water using reverse osmosis units
Obtain pure water.But after stating water purification system in use for a period of time, the impurity concentration meeting of the raw water influent side of ultra filtration unit
It increases, the ultrafiltration membrane of ultra filtration unit can adhere to impurity, cause the effect of filtering to be deteriorated, the service life of water purification system is caused to become
It is short.
Summary of the invention
To be overcome the problems, such as present in the relevant technologies at least to a certain extent, the application provides a kind of water purification system and net
Hydrophone.
According to a first aspect of the present application, a kind of water purification system is provided, comprising:
The pretreatment unit includes ultra-filtration element；The ultrafiltration membrane of the ultra-filtration element is flushable ultrafiltration membrane；
Spray structure is set as at the water inlet of the ultra-filtration element.
Optionally, the pretreatment unit further includes carbon fiber filter core, and the carbon fiber filter core and the ultra-filtration element are multiple
Synthesize composite filter element.
It optionally, further include reverse osmosis units；
The reverse osmosis units include filter core, and the filter core includes diaphragm, central tube and flow-guiding structure, and the diaphragm is anti-
Permeable membrane or nanofiltration membrane；
The diaphragm and flow-guiding structure are on the central tube.
Optionally, the reverse osmosis units include water purification entrance, pure water outlet and water purification outlet；
The flow-guiding structure includes water purification flow-guiding structure and pure water flow-guiding structure；
The water purification entrance is connected with the entrance of the water purification flow-guiding structure, the outlet of the water purification flow-guiding structure and institute
Water purification outlet is stated to be connected；
The both ends of the central tube are connected with the pure water outlet.
Optionally, the reverse osmosis units include water purification entrance, pure water outlet and water purification outlet；
The flow-guiding structure includes water purification flow-guiding structure and pure water flow-guiding structure；
One end of the central tube is connected with the water purification entrance, and the other end is connected with the water purification outlet；
The outlet of the pure water flow-guiding structure is connected with the pure water outlet.
It optionally, further include tap；
The tap is double taps；
Double taps include the first water inlet and the second water inlet；
The water purification outlet is connected with first water inlet, and the pure water outlet is connected with second water inlet
It connects.
Optionally, postposition filter core is provided between the pure water outlet and second water inlet.
Optionally, the reverse osmosis units further include concentrated water outlet, the concentrated water outlet and the water purification flow-guiding structure
Outlet is connected.
It optionally, further include concentrated water branch, the concentrated water branch is connected with concentrated water outlet, the concentrated water branch road
It is provided with valve.
Optionally, the reverse osmosis membrane or nanofiltration membrane are the big flux diaphragm of ultralow pressure.
Optionally, the ultrafiltration membrane is external-compression type PVDF ultrafiltration membrane.
According to a second aspect of the present application, a kind of water purifier is provided, including the water purification as described in the first aspect such as the application
System.
Technical solution provided by the present application can include the following benefits: by the super of the middle ultra-filtration element of pretreatment unit
Filter membrane is set as on the basis of flushable ultrafiltration membrane, is set as spray structure at the water inlet of ultra-filtration element, is using the application
Water purification system carry out water purification when, due to the presence of spray structure, when raw water enters, shearing force be will increase, to ultrafiltration membrane
Impact will increase, also, the film wire intensity of flushable ultrafiltration membrane is larger, can bear the dynamics rinsed, therefore, ultrafiltration membrane raw water
The magazine of influent side is just not easy to be attached on ultrafiltration membrane, it is ensured that the misgivings effect of ultrafiltration membrane remains unchanged substantially, extends
In the period of replacement ultra-filtration element, extend the service life of water purification system.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and together with specification it is used to explain the principle of the application.
Fig. 1 is a kind of structural schematic diagram for water purification system that embodiments herein provides.
Fig. 2 is the structural schematic diagram of filter core in a kind of reverse osmosis units of embodiments herein offer.
Fig. 3 is the schematic diagram in the direction of water flow in a kind of reverse osmosis units of embodiments herein offer.
Fig. 4 is the schematic diagram in the direction of water flow in another reverse osmosis units of embodiments herein offer.
Appended drawing reference: pretreatment unit -1；Ultra-filtration element -2；Carbon fiber filter core -3；Reverse osmosis units -4；Diaphragm -5；In
Heart pipe -6；Water purification flow-guiding structure -71；Pure water flow-guiding structure -72；Water purification entrance -8；Pure water outlet -9；Water purification outlet -10；The fire hose
Head -11；First water inlet -12；Second water inlet -13；Postposition filter core -14；Concentrated water outlet -15；Concentrated water branch -16；Valve-
17。
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent device of some aspects be described in detail in claims, the application.
Embodiment
Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram for water purification system that embodiments herein provides.
As shown in Figure 1, water purification system provided in this embodiment includes pretreatment unit 1, wherein can wrap with processing unit
Ultra-filtration element 2 is included, the ultrafiltration membrane of ultra-filtration element is flushable ultrafiltration membrane, is set as spray structure at the water inlet of ultra-filtration element.
On the basis of setting flushable ultrafiltration membrane for the ultrafiltration membrane of the middle ultra-filtration element of pretreatment unit, ultrafiltration filter
It is set as spray structure at the water inlet of core, when carrying out water purification using the water purification system of the application, due to spray structure
In the presence of when raw water enters, shearing force be will increase, and will increase to the impact of ultrafiltration membrane, also, the film wire intensity of flushable ultrafiltration membrane
It is larger, the dynamics rinsed can be born, therefore, the magazine of ultrafiltration membrane raw water influent side is just not easy to be attached on ultrafiltration membrane, can
To guarantee that the misgivings effect of ultrafiltration membrane remains unchanged substantially, the period of replacement ultra-filtration element is extended, water purification system is extended
Service life.
In addition, pretreatment unit can also include carbon fiber filter core 3, in order to reduce the volume with processing unit, can incite somebody to action
Carbon fiber filter core and ultra-filtration element are combined into composite filter element, specific complex method can with but be not limited only to as nested type or folded
Add formula, as long as advantageously reducing the volume of pretreatment unit and the complex method for not influencing filter core performance is ok.Due to multiple
After conjunction, the volume of filter core becomes smaller, and can wait in quantity is all one, therefore pipe fitting can also tail off therewith, early period installation and after
The step of phase safeguards is reduced, and installation maintenance is more convenient.
Referring to Fig. 2, Fig. 2 is the structural schematic diagram of filter core in a kind of reverse osmosis units of embodiments herein offer.
Further, as shown in Fig. 2, water purification system can also include being connected along water (flow) direction with the pretreatment unit
Reverse osmosis units 4, wherein reverse osmosis units may include filter core, and filter core may include diaphragm 5, central tube 6 and water conservancy diversion knot
Structure, diaphragm can be reverse osmosis membrane or nanofiltration membrane, and diaphragm and flow-guiding structure are on central tube.Wherein, it reverse osmosis membrane or receives
Filter membrane can be the big flux diaphragm of ultralow pressure
The big flux diaphragm of ultralow pressure and flow-guiding structure are fixed on central tube using the method for winding, one side ultralow pressure
Big flux diaphragm can provide biggish flux, and on the other hand, filter core made of the mode of winding can provide biggish surface
Product, it is thereby achieved that water purification system is without pump hair flow production water under the pressure condition of municipal tap water.
Further, in order to stablize water purification system ground pressure, pressure stabilizing can be set in pretreatment unit and reverse osmosis units
Pump, wherein stabilized pressure pump pressure stabilizing direction be consistent with water (flow) direction.
Fig. 3 and Fig. 4 are please referred to, Fig. 3 is the direction of water flow in a kind of reverse osmosis units of embodiments herein offer
Schematic diagram.Fig. 4 is the schematic diagram in the direction of water flow in another reverse osmosis units of embodiments herein offer.It needs to illustrate
, the direction of water flow can be as shown in Figure 3 from filter core lateral inflow, the water outlet of central tube both ends in reverse osmosis units；?
Can be it is as shown in Figure 4 from central tube both ends intake, from filter core side be discharged.
Wherein, reverse osmosis units include water purification entrance 8, pure water outlet 9 and water purification outlet 10；Flow-guiding structure may include net
Water flow-guiding structure 1 and pure water flow-guiding structure 2.Flow-guiding structure can be flow-guiding screen.
When the water (flow) direction in reverse osmosis units is from filter core lateral inflow, when central tube both ends are discharged, the water purification enters
Mouth is connected with the entrance of the water purification flow-guiding structure, and the outlet of the water purification flow-guiding structure is connected with the water purification outlet；
The both ends of the central tube are connected with the pure water outlet.
When the water (flow) direction in reverse osmosis units is to intake from central tube both ends, when being discharged from filter core side, the center
One end of pipe is connected with the water purification entrance, and the other end is connected with the water purification outlet；The pure water flow-guiding structure goes out
Mouth is connected with the pure water outlet.
As shown in Figure 1, embodiments herein further includes tap 11, wherein the tap is double taps, double water
Faucet includes the first water inlet 12 and the second water inlet 13；The water purification outlet is connected with first water inlet, described pure
Water out is connected with second water inlet.Postposition filter can be set between the pure water outlet and second water inlet
Core 14.
In addition, reverse osmosis units further include concentrated water outlet 15, the outlet of the concentrated water outlet and the water purification flow-guiding structure
It is connected.Water purification system further includes concentrated water branch 16, and the concentrated water branch is connected with concentrated water outlet, the concentrated water branch
On be provided with valve 17.
When double taps toggle it to out the side of water purification, raw water becomes water purification by pretreatment unit, water purification using
Water purification flow-guiding structure flows into the first water inlet of double taps from water purification outlet, at this point, flowing out in double taps is water purification.?
During water purification processed, since the water purification come out from pretreatment unit can directly wash away the diaphragm adjacent with water purification flow-guiding structure,
Film surface concentration polarization can be mitigated, pollution abatement extends the service life of the filter core in reverse osmosis units.
When double taps toggle it to out the side of pure water, raw water becomes water purification by pretreatment unit, and water purification is again successively
It is flowed into postposition filter core by water purification flow-guiding structure, reverse osmosis membrane or nanofiltration membrane, pure water flow-guiding structure from pure water outlet, through later
After setting filter element filtering, the second water inlet of double taps is flowed into, at this point, flowing out in double taps is pure water.In pure water processed,
It can be adjusted according to valve of the impure degree of local tap water to concentrated water branch road, to be adapted to different regions water quality item
The system rate of recovery under part extends service life of the filter core in reverse osmosis units under severe condition of water quality.
It should be noted that ultrafiltration membrane can select external-compression type PVDF ultrafiltration membrane, the material of reverse osmosis membrane or nanofiltration membrane can
Think aromatic polyamide composite material.
Embodiments herein provides a kind of water purifier, and water purifier provided in this embodiment includes as above such as institute in embodiment
The water purification system stated.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that term " first ", " second " etc. are used for description purposes only in the description of the present application, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present application, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the application.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although embodiments herein has been shown and described above, it is to be understood that above-described embodiment is example
Property, it should not be understood as the limitation to the application, those skilled in the art within the scope of application can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (13)
1. a kind of water purification system, which is characterized in that including pretreatment unit；
The pretreatment unit includes ultra-filtration element；
The ultrafiltration membrane of the ultra-filtration element is flushable ultrafiltration membrane；
Spray structure is set as at the water inlet of the ultra-filtration element.
2. water purification system according to claim 1, which is characterized in that the pretreatment unit further includes carbon fiber filter core,
The carbon fiber filter core and the ultra-filtration element are combined into composite filter element.
3. water purification system according to claim 2, which is characterized in that further include along water (flow) direction and the pretreatment unit
The reverse osmosis units being connected；
The reverse osmosis units include filter core, and the filter core includes diaphragm, central tube and flow-guiding structure, and the diaphragm is reverse osmosis
Film or nanofiltration membrane；
The diaphragm and flow-guiding structure are on the central tube.
4. water purification system according to claim 3, which is characterized in that the pretreatment unit and the reverse osmosis units it
Between be provided with stabilized pressure pump.
5. water purification system according to claim 3, which is characterized in that the reverse osmosis units include water purification entrance, pure water
Outlet and water purification outlet；
The flow-guiding structure includes water purification flow-guiding structure and pure water flow-guiding structure；
The water purification entrance is connected with the entrance of the water purification flow-guiding structure, the outlet of the water purification flow-guiding structure and described net
Water out is connected；
The both ends of the central tube are connected with the pure water outlet.
6. water purification system according to claim 3, which is characterized in that the reverse osmosis units include water purification entrance, pure water
Outlet and water purification outlet；
The flow-guiding structure includes water purification flow-guiding structure and pure water flow-guiding structure；
One end of the central tube is connected with the water purification entrance, and the other end is connected with the water purification outlet；
The outlet of the pure water flow-guiding structure is connected with the pure water outlet.
7. according to the described in any item water purification systems of claim 5 or 6, which is characterized in that further include tap；
The tap is double taps；
Double taps include the first water inlet and the second water inlet；
The water purification outlet is connected with first water inlet, and the pure water outlet is connected with second water inlet.
8. water purification system according to claim 7, which is characterized in that between the pure water outlet and second water inlet
It is provided with postposition filter core.
9. according to the described in any item water purification systems of claim 5 or 6, which is characterized in that the reverse osmosis units further include dense
Water out, the concentrated water outlet are connected with the outlet of the water purification flow-guiding structure.
10. water purification system according to claim 9, which is characterized in that it further include concentrated water branch, the concentrated water branch and institute
It states concentrated water outlet to be connected, the concentrated water branch road is provided with valve.
11. water purification system according to claim 3, which is characterized in that the reverse osmosis membrane or nanofiltration membrane are big for ultralow pressure
Flux diaphragm.
12. water purification system according to claim 1, which is characterized in that the ultrafiltration membrane is external-compression type PVDF ultrafiltration membrane.
13. a kind of water purifier, which is characterized in that including such as described in any item water purification systems of claim 1-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811200348.XA CN109354227A (en) | 2018-10-15 | 2018-10-15 | Water purification system and water purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811200348.XA CN109354227A (en) | 2018-10-15 | 2018-10-15 | Water purification system and water purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109354227A true CN109354227A (en) | 2019-02-19 |
Family
ID=65349472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811200348.XA Pending CN109354227A (en) | 2018-10-15 | 2018-10-15 | Water purification system and water purifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109354227A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101711949A (en) * | 2009-12-23 | 2010-05-26 | 孙厚钧 | Filter membrane device with fluid automatically controlled oscillating jet washing function |
| CN202148216U (en) * | 2011-02-25 | 2012-02-22 | 四川久润环保科技有限公司 | Membrane bioreactor (MBR) membrane group device capable of washing on line |
| CN204619501U (en) * | 2015-04-15 | 2015-09-09 | 王桂林 | Self-cleaning effluent filter |
| CN204724029U (en) * | 2015-07-03 | 2015-10-28 | 杭州凯宏膜技术有限公司 | A kind of vehicular hollow fiber membrane stack with spray function |
| CN107337290A (en) * | 2017-07-25 | 2017-11-10 | 珠海格力电器股份有限公司 | Pump-free water purification system and water purifier |
-
2018
- 2018-10-15 CN CN201811200348.XA patent/CN109354227A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101711949A (en) * | 2009-12-23 | 2010-05-26 | 孙厚钧 | Filter membrane device with fluid automatically controlled oscillating jet washing function |
| CN202148216U (en) * | 2011-02-25 | 2012-02-22 | 四川久润环保科技有限公司 | Membrane bioreactor (MBR) membrane group device capable of washing on line |
| CN204619501U (en) * | 2015-04-15 | 2015-09-09 | 王桂林 | Self-cleaning effluent filter |
| CN204724029U (en) * | 2015-07-03 | 2015-10-28 | 杭州凯宏膜技术有限公司 | A kind of vehicular hollow fiber membrane stack with spray function |
| CN107337290A (en) * | 2017-07-25 | 2017-11-10 | 珠海格力电器股份有限公司 | Pump-free water purification system and water purifier |
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Application publication date: 20190219 |
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