CN107399843A - A kind of water purification machine of high-performance micro computer control - Google Patents
A kind of water purification machine of high-performance micro computer control Download PDFInfo
- Publication number
- CN107399843A CN107399843A CN201710761353.7A CN201710761353A CN107399843A CN 107399843 A CN107399843 A CN 107399843A CN 201710761353 A CN201710761353 A CN 201710761353A CN 107399843 A CN107399843 A CN 107399843A
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- Prior art keywords
- water
- water quality
- filter element
- purification machine
- testing unit
- 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.)
- Pending
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 238000000746 purification Methods 0.000 title claims abstract description 47
- 238000012372 quality testing Methods 0.000 claims abstract description 41
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 5
- 241000219146 Gossypium Species 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 238000000108 ultra-filtration Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002384 drinking water standard Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002699 waste material Substances 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
- B01D35/1435—Filter condition indicators with alarm means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
- B01D37/041—Controlling the filtration by clearness or turbidity measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/12—Controlling or regulating
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
- C02F2209/008—Processes using a programmable logic controller [PLC] comprising telecommunication features, e.g. modems or antennas
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a kind of water purification machine of high-performance micro computer control, it is related to water purification machine technical field.Including pre-filtering device, high-pressure pump, RO reverse osmosis filters and the water storage device being linked in sequence, wherein institute's pre-filtering device includes first order filter element, second level filter element and the third level filter element being linked in sequence successively by pipeline, and the water inlet of the first order filter element is provided with the first magnetic valve controlled feed.The water inlet of second level filter element is provided with second solenoid valve, and third level filter element water inlet is provided with the 3rd magnetic valve.Water quality testing unit includes the first water quality testing unit and the second water quality testing unit.Present invention additionally comprises microcomputer controlling module, and it includes control unit and alarm unit, and the water quality information gathered according to water quality testing unit controls the filter type of pre-filtering device and judges whether the RO reverse osmosis filters need to change.The present invention can use the use cost of water purification machine significantly.
Description
Technical field
The present invention relates to water purification machine technical field, more particularly to a kind of water purification machine of high-performance micro computer control.
Background technology
Now with people's living standards continue to improve, people especially pay attention to the safety problem of drinking water.Therefore, permitted
More Drinking Water Filtration cleaning equipments are designed to produce, and are exactly that one of which is the most general with water purification machine made of liquid reverse osmosis principle
Logical water quality Jinhua processing equipment.At present, the pre-filtering device of most water purification machines is divided into three-level, first order PP cotton filter cores
For in water of going out compared with coarse granule impurity, the second level be granular activated carbon be used for away peculiar smell and heavy metal for being adsorbed in water etc.,
The third level is that carbon-point activated carbon further removes peculiar smell, heterochromatic etc..And the drinking water standard of country variant is different at present, such as Japan
Running water oneself can drink, filter out impurity without entering first order PP cotton filter cores.In addition, current most water purification machines
RO films are all to judge probably how many days change once by experience, it is clear that if the water quality introduced from running water is preferable, then
The time that reverse osmosis membrane can use is longer, if the simple usage time provided according to reverse osmosis membrane official is changed,
Unnecessary waste can be caused.
The content of the invention
A kind of the defects of it is an object of the invention to for prior art, there is provided pure water of high-performance micro computer control
Machine.
Especially, the invention provides a kind of water purification machine of high-performance micro computer control, including the preposition mistake being linked in sequence
Device, high-pressure pump, RO reverse osmosis filters and water storage device are filtered, wherein,
The pre-filtering device, including first order filter element, the second level filter element being linked in sequence successively by pipeline
With third level filter element, the water inlet of the first order filter element is provided with the first magnetic valve controlled feed, and described second
The water inlet of level filter element is connected with inlet channel also by pipeline and controls the inlet channel provided with second solenoid valve
Direct water filling, the third level filter element water inlet are connected with the inlet channel also by pipeline and are provided with the 3rd electromagnetism
Valve controls the direct water filling of inlet channel；
Water quality testing unit, including the first water quality testing unit and the second water quality testing unit, the first water quality monitoring unit
It is arranged at the water inlet end of the pre-filtering device, second water quality testing unit is arranged on the RO reverse osmosis filters
Water side；
Also include：
Microcomputer controlling module, including control unit and alarm unit, for what is gathered according to the water quality testing unit
Water quality information controls the filter type of the pre-filtering device and judges whether the RO reverse osmosis filters need to change.
Further, first water quality testing unit is provided with the first water quality threshold and the second water quality threshold.
Further, second water quality testing unit is provided with the 3rd water quality threshold.
Further, the filter type of the pre-filtering device includes, when first water quality testing unit collection
When water grade is less than or equal to first water quality threshold, the microcomputer controlling module controls the second solenoid valve and the 3rd
Closed electromagnetic valve, first magnetic valve is opened, so that the running water into the water purification machine passes sequentially through the first order mistake
Filter unit, second level filter element and third level filter element are filtered.
Further, the filter type of the pre-filtering device also includes, when first water quality testing unit gathers
Water grade be more than first water quality threshold and when being less than second water quality threshold, the microcomputer controlling module controls
First magnetic valve and the 3rd closed electromagnetic valve, the second solenoid valve is opened, so that the running water into the water purification machine
The second level filter element and third level filter element is passed sequentially through to be filtered.
Further, the filter type of the pre-filtering device also includes, when first water quality testing unit gathers
Water grade when being more than or equal to second water quality threshold, the microcomputer controlling module controls first magnetic valve and the
Two closed electromagnetic valves, the 3rd magnetic valve are opened, so that the tap water direct into the water purification machine connected third level filtering
Unit is filtered.
Further, when the water grade of second water quality testing unit detection is less than three water quality threshold,
The alarm for changing the RO reverse osmosis filters is sent by the alarm unit.
Further, the alarm unit includes LED and loudspeaker.
Further, the microcomputer controlling module also includes Wi-Fi module, and the microcomputer controlling module is accessed into family
Front yard Wi-Fi wireless networks, so that user controls the water purification machine by cell phone application.
Further, the first order filter element is 5 microns of PP cotton filter cores, and the second level filter element is lived for particle
Property filtration core, the third level filter element is sintering activity filtration core.
The water purification machine of the high-performance micro computer control of the present invention, by the first order filter element being sequentially connected in series, second
Level filter element and the entrance of third level filter element are separately provided magnetic valve, further according to being arranged on the pre-filtering device
Water inlet end at the first water quality testing unit detect the water grade into the running water of water purification machine, and then pass through micro computer
Control module controls the filter type of the pre-filtering device, improves the filter efficiency of the pre-filtering device.In addition, this
Water of the invention also by being detected according to second water quality testing unit being arranged at the RO reverse osmosis filters water side
Matter grade to judge whether to need to change the RO reverse osmosis filters, avoid use tradition according to processing water for judge according to
According to mode, improve judgment accuracy.
According to the accompanying drawings will be brighter to the detailed description of the specific embodiment of the invention, those skilled in the art
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
Some specific embodiments of the present invention are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that these
What accompanying drawing was not necessarily drawn to scale.In accompanying drawing：
Fig. 1 is the structural representation of the water purification machine of the high-performance micro computer control of one embodiment of the invention.
Embodiment
Fig. 1 is the structural representation of the water purification machine of the high-performance micro computer control of one embodiment of the invention.As shown in figure 1,
The water purification machine of the high-performance micro computer control of the present invention, including the pre-filtering device, high-pressure pump, the RO reverse osmosis that are linked in sequence pass through
Filter and water storage device, wherein, the pre-filtering device, including the first order filter element being linked in sequence successively by pipeline
2nd, second level filter element 3 and third level filter element 4.The water inlet of the first order filter element 2 is provided with the first electromagnetism
The control water inlet of valve 18.The water inlet of the second level filter element 3 is connected with inlet channel also by pipeline and provided with second
Magnetic valve 11 controls the direct water filling of the inlet channel.The water inlet of third level filter element 4 also by pipeline with it is described
Inlet channel connects and provided with the control direct water filling of inlet channel of the 3rd magnetic valve 21.Water quality testing unit is examined including the first water quality
Survey the water quality testing unit 7 of unit 1 and second.The first water quality monitoring unit 1 is arranged on the water inlet of the pre-filtering device
At end, second water quality testing unit 7 is arranged on the water side of the RO reverse osmosis filters 6.The water purification machine of the present invention is also
Include control unit and alarm unit including microcomputer controlling module, for the water gathered according to the water quality testing unit
Matter information controls the filter type of the pre-filtering device and judges whether the RO reverse osmosis filters 6 need to change.
The water purification machine of the high-performance micro computer control of the present invention, by the first order filter element 2, second being sequentially connected in series
The entrance of level filter element 3 and third level filter element 4 is separately provided magnetic valve, is filled further according to the prefilter is arranged on
The first water quality testing unit 1 at the water inlet end put detects the water grade into the running water of water purification machine, and then by micro-
Computer control module controls the filter type of the pre-filtering device, improves the filter efficiency of the pre-filtering device.This
Outside, the present invention according to second water quality testing unit 7 being arranged at the RO reverse osmosis filters water side also by examining
The water grade of survey avoids to judge whether to need to change the RO reverse osmosis filters 6 and uses tradition according to processing water
For the mode of basis for estimation, judgment accuracy is improved, it is to be understood that what each country or each waterworks provided
Water grade is all different, handles water using RO reverse osmosis filters 6 or processing time there will naturally be very as basis for estimation
Big error, for example, the running water of Japan is to reach the standard directly drunk, same out time or the same water of processing
The pure water of amount, it is different to change the time of RO reverse osmosis filters.
As shown in figure 1, the water purification machine water inlet 22 of the present invention is connected by pipeline and the pre-filtering device by pipeline
Connect, the water inlet of the pre-filtering device is provided with the first water quality testing unit 1, the water inlet of first water quality testing unit 1
The 4th magnetic valve 10, total magnetic valve as whole water purification machine are provided with mouthful.The first order filter element 2 is 5 microns of PP cottons
Filter core, the second level filter element 3 are granular activated carbon filter core, and the third level filter element is sintering activity filtration core.
In one embodiment, first water quality testing unit 1 of the invention is provided with the first water quality threshold and the second water quality
Threshold value.Second water quality testing unit 7 is provided with the 3rd water quality threshold.The pre-filtering device of the present invention can be operated in three kinds
Under filter type, the filter type of the pre-filtering device includes, when water quality of first water quality testing unit 1 collection etc.
When level is less than or equal to first water quality threshold, the microcomputer controlling module controls the electromagnetism of second solenoid valve 11 and the 3rd
Valve 21 is closed, and first magnetic valve 18 is opened, so that the running water into the water purification machine passes sequentially through the first order mistake
Filter unit 2, second level filter element 3 and third level filter element 4 are filtered.When first water quality testing unit 1 gathers
Water grade be more than first water quality threshold and when being less than second water quality threshold, the microcomputer controlling module controls
The magnetic valve 21 of first magnetic valve 18 and the 3rd is closed, the second solenoid valve 3 is opened so that into the water purification machine from
Water passes sequentially through the second level filter element 3 and third level filter element 4 and filtered.When the first water quality detection list
When the water grade of the collection of member 1 is more than or equal to second water quality threshold, microcomputer controlling module control first electricity
Magnet valve 18 and second solenoid valve 11 are closed, and the 3rd magnetic valve 21 is opened, so that the running water into the water purification machine is direct
Filtered by third level filter element 4.The delivery port of the third level filter element 4 is entered by pipeline and booster pump 5
The mouth of a river connects, the delivery port of the booster pump 5 by triple valve 17 respectively with the RO reverse osmosis filters and the ultrafiltration water
Case 16 connects.The 5th magnetic valve 12 is provided with pipeline between the booster pump 5 and the RO reverse osmosis filters.The threeway
Pipeline between valve 17 and the ultrafiltration water tank 16 is sequentially provided with described in the 6th magnetic valve 14 and the prevention of control ultrafiltration water break-make
The check valve 24 of ultrafiltration water backflow in ultrafiltration water tank 16.The delivery port of the ultrafiltration water tank 16 passes through pipeline and the 7th magnetic valve
It is connected to water purification machine delivery port 19.The pure water outlet of the RO reverse osmosis filters 6 is connected to High Pressure Pure Water case by pipeline
9, the High Pressure Pure Water case 9 is used to store pure water.The second water quality is provided with the pure water outlet of the RO reverse osmosis filters 6
The second check valve 13 is provided with pipeline between detection unit and the High Pressure Pure Water case 9 and the RO reverse osmosis filters 6, with
Prevent the pure water in the High Pressure Pure Water case 9 from flowing back.
The water purification machine of the present invention filters out between High Pressure Pure Water case 9 and the water purification machine delivery port 19 provided with post active carbon
Device 8, peculiar smell, impurity for further removing the pure water residual in High Pressure Pure Water case 9 etc..The RO reverse osmosis filters
Backwash valve 23 is provided with 6 wastewater outlet, waste water discharges water purification machine by pipeline 20.
Further, when the water grade of second water quality testing unit detection is less than three water quality threshold,
The alarm for changing the RO reverse osmosis filters is sent by the alarm unit.The alarm unit includes
LED and loudspeaker.The microcomputer controlling module also includes Wi-Fi module, and the microcomputer controlling module is accessed into family Wi-
Fi wireless networks, so that user controls the water purification machine by cell phone application.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple showing for the present invention
Example property embodiment, still, still can be direct according to present disclosure without departing from the spirit and scope of the present invention
It is determined that or derive many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the present invention is understood that and recognized
It is set to and covers other all these variations or modifications.
Claims (10)
1. a kind of water purification machine of high-performance micro computer control, including be linked in sequence pre-filtering device, high-pressure pump, RO counter-infiltrations
Filter and water storage device, wherein,
The pre-filtering device, including first order filter element, the second level filter element being linked in sequence successively by pipeline
With third level filter element, the water inlet of the first order filter element is provided with the first magnetic valve controlled feed, and described second
The water inlet of level filter element is connected with inlet channel also by pipeline and controls the inlet channel provided with second solenoid valve
Direct water filling, the third level filter element water inlet are connected with the inlet channel also by pipeline and are provided with the 3rd electromagnetism
Valve controls the direct water filling of inlet channel；
Water quality testing unit, including the first water quality testing unit and the second water quality testing unit, the first water quality monitoring unit
It is arranged at the water inlet end of the pre-filtering device, second water quality testing unit is arranged on the RO reverse osmosis filters
Water side；
Also include：
Microcomputer controlling module, including control unit and alarm unit, for what is gathered according to the water quality testing unit
Water quality information controls the filter type of the pre-filtering device and judges whether the RO reverse osmosis filters need to change.
2. water purification machine according to claim 1, it is characterised in that first water quality testing unit is provided with the first water quality threshold
Value and the second water quality threshold.
3. water purification machine according to claim 1, it is characterised in that second water quality testing unit is provided with the 3rd water quality threshold
Value.
4. water purification machine according to claim 2, it is characterised in that the filter type of the pre-filtering device includes, when
When the water grade of the first water quality testing unit collection is less than or equal to first water quality threshold, the micro computer controlled molding
Block controls the second solenoid valve and the 3rd closed electromagnetic valve, and first magnetic valve is opened, so that into the water purification machine
Running water passes sequentially through the first order filter element, second level filter element and third level filter element and filtered.
5. water purification machine according to claim 2, it is characterised in that the filter type of the pre-filtering device also includes,
When the water grade of first water quality testing unit collection is more than first water quality threshold and is less than the second water quality threshold
During value, the microcomputer controlling module controls first magnetic valve and the 3rd closed electromagnetic valve, and the second solenoid valve is opened,
So that the running water into the water purification machine passes sequentially through the second level filter element and third level filter element and filtered.
6. water purification machine according to claim 2, it is characterised in that the filter type of the pre-filtering device also includes,
When the water grade of first water quality testing unit collection is more than or equal to second water quality threshold, the micro computer control
Module controls first magnetic valve and second solenoid valve to close, and the 3rd magnetic valve is opened, so that into the water purification machine
Tap water direct connected third level filter element and filtered.
7. water purification machine according to claim 3, it is characterised in that when water quality of second water quality testing unit detection etc.
When level is less than three water quality threshold, the alarm for changing the RO reverse osmosis filters is sent by the alarm unit
Prompting.
8. water purification machine according to claim 7, it is characterised in that the alarm unit includes LED and loudspeaker.
9. water purification machine according to claim 1, it is characterised in that the microcomputer controlling module also includes Wi-Fi module,
The microcomputer controlling module is accessed into family's Wi-Fi wireless networks, so that user controls the water purification machine by cell phone application.
10. water purification machine according to claim 1, it is characterised in that the first order filter element is that 5 microns of PP cottons filter
Core, the second level filter element are granular activated carbon filter core, and the third level filter element is sintering activity filtration core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710761353.7A CN107399843A (en) | 2017-08-30 | 2017-08-30 | A kind of water purification machine of high-performance micro computer control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710761353.7A CN107399843A (en) | 2017-08-30 | 2017-08-30 | A kind of water purification machine of high-performance micro computer control |
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| Publication Number | Publication Date |
|---|---|
| CN107399843A true CN107399843A (en) | 2017-11-28 |
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|---|---|---|---|
| CN201710761353.7A Pending CN107399843A (en) | 2017-08-30 | 2017-08-30 | A kind of water purification machine of high-performance micro computer control |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107098508A (en) * | 2017-06-23 | 2017-08-29 | 青岛三利中德美水设备有限公司 | Direct drinking sub-prime water work and its method of supplying water |
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- 2017-08-30 CN CN201710761353.7A patent/CN107399843A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107098508A (en) * | 2017-06-23 | 2017-08-29 | 青岛三利中德美水设备有限公司 | Direct drinking sub-prime water work and its method of supplying water |
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Application publication date: 20171128 |