CN101864792A - A device and method for automatically filling a toilet with drained water from a washing machine - Google Patents
A device and method for automatically filling a toilet with drained water from a washing machine Download PDFInfo
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- CN101864792A CN101864792A CN201010203124A CN201010203124A CN101864792A CN 101864792 A CN101864792 A CN 101864792A CN 201010203124 A CN201010203124 A CN 201010203124A CN 201010203124 A CN201010203124 A CN 201010203124A CN 101864792 A CN101864792 A CN 101864792A
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Abstract
本发明公开了一种用洗衣机排出水自动给马桶上水的装置及方法，该装置包括洗衣机、蓄水箱、马桶及其水位判断模块，所述的蓄水箱通过进水管与洗衣机的排水通道连通，蓄水箱底部设有排水泵，排水泵引出的排水管通过一三通与自来水管道及马桶进水管相连，三通内设有一牵引阀，蓄水箱底部的电源板通过控制牵引阀与排水泵实现用洗衣水自动给马桶上水。本发明可以将洗衣机排水的洗衣水充分循环利用，经济又环保，该装置简单且采用全自动控制，有利于推广使用。
The invention discloses a device and method for automatically filling a toilet with drained water from a washing machine. The device includes a washing machine, a water storage tank, a toilet and a water level judging module thereof. The water storage tank is connected to the drainage channel of the washing machine through a water inlet pipe Connected, there is a drain pump at the bottom of the water storage tank, and the drain pipe from the drain pump is connected with the tap water pipe and the toilet water inlet pipe through a three-way connection. The drain pump realizes automatic filling of the toilet with laundry water. The invention can fully recycle the washing water drained from the washing machine, is economical and environment-friendly, and the device is simple and adopts automatic control, which is favorable for popularization and use.
Description
Technical field
The present invention relates to the washing machine field, particularly a kind of with the washing machine discharge water automatically to the device and method of water on the toilet.
Background technology
On January 12nd, 2009, the World Bank has issued " water that solves China is rare: about the suggestion of the some problems of water resources management " at the water resource disappearance present situation that China faced since 3 years.It is not unique, but has its counterpart, and February 2, the annual meeting of Davos World Economic Forum proposes, and the whole world will sink into " water resource bankruptcy " in 20 years, so perhaps water can more have investment value than oil.Flush toilet is the indispensable sanitary equipment in Modern Family's life, yet the horse water consumption that draws water also is a problem too much., in resident's household water, the water of flushing the toilet has accounted for 27% of total water amount.Rough calculation is used the saving flush toilet of 5 liters of types once, according to (every day 4 urine, 1 stool/people), water supply volume will 15 liters/people, family of three, average daily water supply volume will 45 liters. and all water supply volumes will reach about 300 liters, if calculate according to non-water-saving toilet, water supply volume is doubled at least.
Washing machine also is the indispensable household electrical appliance in the modern life at present, common rotary drum washing machine is washed about 150 liters of clothes water consumption, calculate for 2 times according to week laundry, just need about 300 premium on currency, but relatively say, the use water quality requirement of flush toilet is not very high, therefore it is feasible being used for towards toilet with the water after the laundry, if because washings are dirtier, requirement to water increases, and is satisfactory fully with carrying out flush toilet after the filtration of the process of the water after the rinsing, the virus killing antibacterial treatment.
By above-mentioned analysis, if use the mode using water wisely of washing machine and toilet combination, be of practical significance very much for one family, more importantly be to do one's bit the theory of advocating environment protection, water saving in real life for solving the problem that country, earth freshwater resources day by day lack.
The utility model patent of the patent No.: ZL200520132059.2 discloses a kind of type water-saving toilet that utilizes once more, on toilet, increase the influent waste water pipeline, can utilize the waste water of washbasin outflow and the waste water flush toilet of washing machine, reach the purpose of water saving, the deficiency of this invention is there is not special waste water storing unit, waste water is flowed directly into water tank, and tap water has been filled with water tank in nearly all situation, the waste water that enters pollutes the water in the case and can't deposit, directly flow out by overflow pipe, not only not conserve water, contaminant water on the contrary.
The patent of invention of patent application 200510030052.4 discloses a kind of family expenses water recovery apparatus, form by gutter, pipe pressurizing pump, last water tank, lower water tank, reuse water pipe, washing machine and bathing can be dashed the water of the comparatively cleaning of drenching the later stage by water plug and water return pipeline, enter prefabricated water tank deposit, for follow-up flush toilet uses.The problem of this device is can not control automatically between water in the water storage box and the toilet, makes troubles therefore for people's use, can't promote the use of.
In view of this, special proposition the present invention.
Summary of the invention
The object of the present invention is to provide a kind of with the washing machine discharge water automatically to the device of water on the toilet, for realizing first purpose, the present invention adopts following technical scheme:
A kind of with the washing machine discharge water automatically to the device of water on the toilet, comprise washing machine, water storage box, toilet and water level judge module thereof, described water storage box is communicated with the drainage channel of washing machine by water inlet pipe, the water storage box bottom is provided with drainage pump, the gutter that drainage pump is drawn links to each other with water supply pipe and toilet water inlet pipe by a threeway, be provided with a drawing valve in the threeway, the power panel of water storage box bottom is realized with laundry water automatically to water on the toilet by control drawing valve and drainage pump.
Described toilet water level judge module comprises a cover switch and a tongue tube, and this switch is located in the water-closet tank, and the height of float and the water level of water tank are consistent; The toilet outside also is provided with a tongue tube, and the height of this tongue tube is 0.8-1 a times of water-closet tank peak level.
Described water storage box bottom is provided with a constant close contact, and this constant close contact is made up of a pair of pole plate, a bottommost that is installed in water storage box, and one is higher than this pole plate 10mm, and a side of pole plate respectively has a lead-out wire to link to each other with power panel.
Described water storage box sidewall is equipped with the water pipe that communicates with the water storage box water level, establishes the float that has magnet in this water pipe, and the position of float is consistent with the water storage box middle water level; The lowest part of water storage box also is provided with a tongue tube, and the lead-out wire of tongue tube links to each other with power panel.
Described power panel comprises the power supply conversion portion, and this power supply conversion portion changes into low-voltage DC with the 220V AC high voltage and gives relay K 1, K2 and switching signal power supply thereof, thereby makes the power on/off of power panel control drawing valve and drainage pump.
Be provided with an one way valve in the gutter that described drainage pump is drawn, laundry water can only be by the unidirectional water-closet tank that drains into of water storage box.
The inventive system comprises washing machine, water storage box, toilet and water level judge module thereof.Washing machine is a washing machine of going up draining, conveniently the water of washing machine is got in the water storage box.The optional filter that is provided with in the water inlet of water storage box, filter among the present invention is the gauze of 3-5 layer, be provided with the solid slow-release disinfecting substance in the gauze, its body shape is sheet, bulk, cylindrical shape, Powdered, its constituent is identical with existing disinfectant, can be the chlorine dioxide slow-release sheet as this slow release disinfecting substance.This filter can filter the impurity in the laundry water and laundry water be carried out sterilizing handle, and laundry water is stored in the water storage box after processing such as sterilizing.
The bottom of water storage box also is provided with drainage pump, and the gutter that this drainage pump is drawn links to each other with the water inlet pipe of water supply pipe, toilet by a threeway.Be provided with an one way valve in the gutter that drainage pump is drawn, this one way valve can be controlled water can only flow to toilet from water storage box, and can not flow back into water storage box from toilet or water supply pipe.One drawing valve is installed in the threeway, and this drawing valve can be realized the water in the water storage box and the switching of tap water.Promptly when water storage box had water, power panel control drawing valve cut off the power supply, and valve plug is blocked water supply pipe, and water storage box supplies water to toilet; When water storage box does not have water, the energising of power panel control drawing valve, valve plug draws back, and is supplied water to toilet by water supply pipe.
Toilet among the present invention is a flush toilet of the prior art, and the water level judge module is installed on toilet, and this water level judge module comprises a cover switch and a tongue tube.This switch is installed in the inside of toilet, and float can fluctuate along with water level, and magnet is installed on the float; Tongue tube is installed on the outer wall at toilet rear portion, after the flush toilets, and drawdown, the magnet float descends, and tongue tube is in off-state; After last water was full, the magnet float rose, and the tongue tube closure has realized the isolation of water power like this, does not have potential safety hazard.
The sidewall of water storage box is equipped with the water pipe that communicates with the water storage box water level, is provided with a float that has magnet in the water pipe, and this float can fluctuate along with the variation of water level.The water level lowest part of water storage box is installed a tongue tube simultaneously, when the position of tongue tube can guarantee that float drops down onto lowest part, just in time with the magnet induction, makes the reed switch contact closure.The lead-out wire of tongue tube is connected on the power panel of installing the water storage box bottom.Also be provided with a constant close contact in the water storage box, this constant close contact is made up of two pole plates, and a bottommost that is installed in water storage box, another piece are higher than this pole plate 10mm, and two pole plates are installed in cistern interior, and the one side respectively has a lead-out wire to be connected on the power panel.When water storage box has water and its highly to be higher than two pole plates, because water is conductor, two closings of contact; Drainage pump work can be supplied water to toilet; When drawdown to bucket during the end, this contact disconnects, then drainage pump outage, drainage pump idle running when having avoided water storage box anhydrous.Power panel comprises the power supply conversion portion, and this power supply conversion portion changes into low-voltage DC with the 220V AC high voltage and gives relay K 1, K2 and switching signal power supply thereof, thereby makes the power on/off of power panel control drawing valve and drainage pump, thereby finishes automatic loading water.
In addition, the top of water storage box also is provided with an overflow pipe, and when the water level of water-closet tank and water storage box all reaches peak, the water that washing machine is discharged can directly drain into sewer by overflow pipe.
Second purpose of the present invention be to provide a kind of with the laundry water automatically to the control method of water on the toilet, for realizing second purpose of the present invention, adopt following technical scheme:
A kind of method of using said apparatus to water on the toilet, this method comprises the steps:
(1) toilet drawdown;
(2) judge whether water is arranged in the water storage box, if water storage box has water, execution in step (3), water storage box is anhydrous, execution in step (4);
(3) water is arranged in water storage box, the outage of power panel control drawing valve, the laundry water in the water storage box drains into water-closet tank by drainage pump, and toilet water level judge module is judged the water level in the water-closet tank, when water level reaches peak, the outage of power panel control drainage pump; Work as drawdown, execution in step (2);
(4) anhydrous in water storage box, the energising of power panel control drawing valve disconnects the drainage pump power supply, and water supply pipe supplies water to water-closet tank; Toilet water level judge module judges the water level in the water-closet tank, and when water level reaches peak, power panel control drawing valve and drainage pump cut off the power supply simultaneously; Work as drawdown, execution in step (2).
Described toilet water level judge module being judged as water level: height and its water level of float are consistent in the water tank, and when water level and float decline, the tongue tube at toilet top is in off-state; When toilet water level and float rise to highest point, the tongue tube closure, power panel judges whether and need supply water to water-closet tank by the disconnection and the closure of tongue tube.
Height and its water level of float are consistent in the water storage box, water level in water storage box is in minimum, and float drops down onto bottom position and makes the tongue tube closure, when water level rises, thereby float rises tongue tube is disconnected, and power panel judges according to the disconnection and the closure of tongue tube whether water is arranged in the water storage box.
Being controlled to be of described power panel: when toilet tongue tube closure and water tank also had water, relay K 1 coil was charged, the constant open contact closure of K1, and drainage pump leads to the 220V alternating current, to water on the toilet; When the tongue tube of water tank was closed, relay K 2 coils were charged, constant open contact K2 closure, and drawing valve leads to the 220V alternating current, water supply pipe is opened, and to water on the toilet, this moment, the constant close contact of water tank disconnected the K1 coil blackout by tap water, the K1 constant open contact disconnects, and the drainage pump outage quits work.
Control method of the present invention is as follows:
When in the water storage box water being arranged, to drawing valve outage, close water supply pipe, if the drawdown in this moment water-closet tank, the tongue tube on the toilet disconnects, the energising of plumbing this moment pump, drainage pump drains into toilet with the washing machine in the water storage box; When the water-closet tank middle water level reaches highest point, tongue tube closure, then drainage pump outage.
When not having water in the water storage box, the drawing valve energising is opened, and is directly supplied water to toilet by water supply pipe, simultaneously drainage pump is cut off the power supply.
Specific to circuit control, as shown in Figure 3, K1, K2 are auxiliary reclays.When the toilet tongue tube disconnects and water storage box when also having water, relay K 1 coil is charged, the constant open contact closure of K1, and drainage pump 11 logical 220V alternating currents are to water on the toilet; When the tongue tube of water storage box was closed, relay K 2 coils were charged, constant open contact K2 closure, drawing valve leads to the 220V alternating current, water supply pipe is opened, by tap water to water on the toilet.Simultaneously, the constant close contact of water storage box disconnects, the K1 coil blackout, and the K1 constant open contact disconnects, and the drainage pump outage quits work.
Adopt technique scheme, the present invention has following beneficial effect:
1, control method is simple and practical, all adopts hardware controls, and cost is cheap and reliability is high.
2, the present invention can make full use of the laundry water that washing machine is discharged, and has saved water resource greatly, has considerable economic and social benefit.
Description of drawings
Fig. 1 structural representation of the present invention
The flow chart of Fig. 2 collection method of the present invention
Fig. 3 circuit controling drawing of the present invention
The critical element explanation
1 washing machine, 2 water storage boxes, 3 toilets, 4 water inlet pipes, 5 pole plates, 6 pole plates, 7 power panels, 8 water pipes, 9 floats, 10 tongue tubes, 11 drainage pumps, 12 overflow pipes, 13 gutters, 14 one way valves, 15 threeways, 16 water supply pipes, 17 drawing valves, 18 tongue tubes, 19 water pipes, 20 floats
The specific embodiment
Below in conjunction with embodiment the present invention is described in more detail.
Embodiment 1
Usefulness washing machine discharge water as shown in Figure 1 comprises washing machine 1, water storage box 2, toilet 3 and water level judge module thereof automatically to the device of water on the toilet.Washing machine 1 is a washing machine of going up draining, conveniently the water of washing machine 1 is got in the water storage box 2.Water storage box 2 is communicated with the drainage channel of washing machine 1 by water inlet pipe 4.The bottom of water storage box 2 also is provided with drainage pump 11, and the gutter 13 that this drainage pump 11 is drawn links to each other with the water inlet pipe of water supply pipe 16, toilet by a threeway 15.Be provided with an one way valve 14 in the gutter 13 that drainage pump is drawn, this one way valve 14 can be controlled water can only flow to toilet 3 from water storage box 2, and can not flow back into water storage box 2 from toilet 3 or water supply pipe 16.One drawing valve 17 is installed in the threeway 15, and this drawing valve 17 can be realized the water of 2 li of water storage boxes and the switching of tap water.Promptly when water storage box 2 had water, power panel 7 control drawing valves 17 cut off the power supply, and valve plug is blocked water supply pipe 16, and water storage box 2 supplies water for toilet 3; When water storage box 2 does not have water, 17 energisings of power panel 7 control drawing valves, valve plug draws back, and supplies water for toilet 3 by water supply pipe 16.
The sidewall of water storage box 2 is equipped with the water pipe 8 that communicates with the water storage box water level, is provided with a float 9 that has magnet in the water pipe 8, and this float 9 can fluctuate along with the variation of water level.The water level lowest part of water storage box 2 is installed a tongue tube 10 simultaneously, when the position of tongue tube 10 can guarantee that float drops down onto lowest part, just in time with the magnet induction, makes tongue tube 10 closings of contact.The lead-out wire of tongue tube 10 is connected on the power panel of installing water storage box 2 bottoms 7.Also be provided with a constant close contact in the water storage box 2, this constant close contact is made up of two pole plates 5,6, and pole plate 6 is installed in the bottommost of water storage box, and another piece pole plate 5 is higher than this pole plate 10mm, two pole plates are installed in water storage box 2 inside, and the one side respectively has a lead-out wire to be connected on the power panel 7.When water storage box 2 has water and its highly to be higher than two pole plates, because water is conductor, two closings of contact; Drainage pump 11 work can be supplied water to toilet 3; When drawdown to bucket during the end, this contact disconnects, then drainage pump 11 outages, drainage pump idle running when having avoided water storage box 2 anhydrous.Power panel 7 comprises the power supply conversion portion, this power supply conversion portion changes into low-voltage DC with the 220V AC high voltage and gives relay K 1, K2 and switching signal power supply thereof, thereby make the power on/off of power panel 7 control drawing valves 17 and drainage pump 11, thereby finish automatic loading water.
In addition, the top of water storage box 2 also is provided with an overflow pipe 12, and when the water level of water-closet tank and water storage box 2 all reaches peak, the water that washing machine is discharged can directly drain into sewer by overflow pipe 12.
As shown in Figure 2, control method of the present invention is as follows:
When in the water storage box 2 water being arranged, give drawing valve 17 outages, close water supply pipe 16, if the drawdown in this moment water-closet tank, the tongue tube 18 on the toilet 3 disconnects, 11 energisings of plumbing this moment pump, drainage pump 11 drains into toilet 3 with the laundry water in the water storage box 2; When the water-closet tank middle water level reaches highest point, tongue tube 18 closures, then drainage pump 11 outages.
When not having water in the water storage box 2, drawing valve 17 energisings are opened, and supply water directly for toilet 3 by water supply pipe 16, simultaneously with drainage pump 11 outages.
Specific to circuit control, as shown in Figure 3, K1, K2 are auxiliary reclays.When toilet tongue tube 18 disconnects and water storage box 2 when also having water, relay K 1 coil is charged, the constant open contact closure of K1, and drainage pump 11 logical 220V alternating currents are given water on the toilet 3; When the tongue tube 10 of water storage box 2 was closed, relay K 2 coils were charged, constant open contact K2 closure, and drawing valve 17 logical 220V alternating currents draw back water supply pipe 16, give water on the toilet 3 by tap water.Simultaneously, the constant close contact of water storage box 2 disconnects, the K1 coil blackout, and the K1 constant open contact disconnects, and drainage pump 11 outages quit work.
Compare with embodiment, distinctive points only is: tongue tube 18 is installed on the outer wall at toilet 3 rear portions, and the height of this tongue tube 18 is 1 times of water-closet tank peak level.
Compare with embodiment, distinctive points only is: tongue tube 18 is installed on the outer wall at toilet 3 rear portions, and the height of this tongue tube 18 is 0.9 times of water-closet tank peak level.And the water inlet of water storage box 2 also is provided with a filter, and this filter is 5 layers a gauze, is provided with the solid slow-release disinfecting substance in the gauze, and this slow release disinfecting substance is the chlorine dioxide slow-release sheet.This filter can filter the impurity in the laundry water and laundry water be carried out sterilizing handle, and laundry water is stored in the water storage box 2 after processing such as sterilizing.
Claims (10)
- One kind with the washing machine discharge water automatically to the device of water on the toilet, comprise washing machine, water storage box, toilet and water level judge module thereof, it is characterized in that: described water storage box is communicated with the drainage channel of washing machine by water inlet pipe, the water storage box bottom is provided with drainage pump, the gutter that drainage pump is drawn links to each other with water supply pipe and toilet water inlet pipe by a threeway, be provided with a drawing valve in the threeway, the power panel of water storage box bottom is realized with laundry water automatically to water on the toilet by control drawing valve and drainage pump.
- 2. device according to claim 1 is characterized in that: described toilet water level judge module comprises a cover switch and a tongue tube, and this switch is located in the water-closet tank, and the height of float and the water level of water tank are consistent; The toilet outside also is provided with a tongue tube, and the height of this tongue tube is 0.8-1 a times of water-closet tank peak level.
- 3. device according to claim 1, it is characterized in that: described water storage box bottom is provided with a constant close contact, and this constant close contact is made up of a pair of pole plate, a bottommost that is installed in water storage box, one is higher than this pole plate 10mm, and a side of pole plate respectively has a lead-out wire to link to each other with power panel.
- 4. device according to claim 3 is characterized in that: described water storage box sidewall is equipped with the water pipe that communicates with the water storage box water level, establishes the float that has magnet in this water pipe, and the position of float is consistent with the water storage box middle water level; The lowest part of water storage box also is provided with a tongue tube, and the lead-out wire of tongue tube links to each other with power panel.
- 5. device according to claim 4, it is characterized in that: described power panel comprises the power supply conversion portion, this power supply conversion portion changes into low-voltage DC with the 220V AC high voltage and gives relay K 1, K2 and switching signal power supply thereof, thereby makes the power on/off of power panel control drawing valve and drainage pump.
- 6. device according to claim 5 is characterized in that: be provided with an one way valve in the gutter that described drainage pump is drawn, laundry water can only be by the unidirectional water-closet tank that drains into of water storage box.
- 7. one kind with the method for the described device of claim 1 to water on the toilet, and it is characterized in that: this method comprises the steps:(1), toilet drawdown;(2), judge whether water is arranged in the water storage box, if water storage box has water, execution in step (3), water storage box is anhydrous, execution in step (4);(3), water is arranged in water storage box, the outage of power panel control drawing valve, the laundry water in the water storage box drains into water-closet tank by drainage pump, and toilet water level judge module is judged the water level in the water-closet tank, when water level reaches peak, the outage of power panel control drainage pump; Work as drawdown, execution in step (2);(4), anhydrous in water storage box, the energising of power panel control drawing valve disconnects the drainage pump power supply, water supply pipe supplies water to water-closet tank; Toilet water level judge module judges the water level in the water-closet tank, when water level reaches peak, and the outage of power panel control drawing valve; Work as drawdown, execution in step (2).
- 8. method according to claim 7 is characterized in that: described toilet water level judge module being judged as water level: height and its water level of float are consistent in the water tank, and when water level and float decline, the tongue tube at toilet top is in off-state; When toilet water level and float rise to highest point, the tongue tube closure, power panel judges whether and need supply water to water-closet tank by the disconnection and the closure of tongue tube.
- 9. method according to claim 8, it is characterized in that: height and its water level of float are consistent in the water storage box, water level in water storage box is in minimum, float drops down onto bottom position and makes the tongue tube closure, when water level rises, thereby float rises tongue tube is disconnected, and power panel judges according to the disconnection and the closure of tongue tube whether water is arranged in the water storage box.
- 10. method according to claim 9 is characterized in that: being controlled to be of described power panel: when the toilet tongue tube disconnects and water storage box when water is arranged, relay K 1 coil is charged, the constant open contact closure of K1, and drainage pump leads to the 220V alternating current, to water on the toilet; When the tongue tube of water storage box is closed, relay K 2 coils are charged, constant open contact K2 closure, drawing valve leads to the 220V alternating current, and water supply pipe is opened, by tap water to water on the toilet, this moment, the constant close contact of water storage box disconnected, the K1 coil blackout, and the K1 constant open contact disconnects, the drainage pump outage quits work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010203124.1A CN101864792B (en) | 2010-06-18 | 2010-06-18 | A kind of washing machine discharges water automatically to the device and method of water on toilet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010203124.1A CN101864792B (en) | 2010-06-18 | 2010-06-18 | A kind of washing machine discharges water automatically to the device and method of water on toilet |
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| Publication Number | Publication Date |
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| CN101864792A true CN101864792A (en) | 2010-10-20 |
| CN101864792B CN101864792B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010203124.1A Expired - Fee Related CN101864792B (en) | 2010-06-18 | 2010-06-18 | A kind of washing machine discharges water automatically to the device and method of water on toilet |
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| CN106555425A (en) * | 2015-09-25 | 2017-04-05 | 青岛经济技术开发区海尔热水器有限公司 | Water saving device and water saving control method |
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| CN103526518A (en) * | 2013-10-24 | 2014-01-22 | 张文艺 | Automatic roller washing machine with recyclable washing water |
| CN103526518B (en) * | 2013-10-24 | 2016-01-20 | 张文艺 | A kind of laundry water can reuse drum automatic washing machine |
| CN106555425A (en) * | 2015-09-25 | 2017-04-05 | 青岛经济技术开发区海尔热水器有限公司 | Water saving device and water saving control method |
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| CN101864792B (en) | 2015-11-25 |
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Effective date of registration: 20160819 Address after: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee after: QINGDAO HAIER WASHING MACHINE Co.,Ltd. Address before: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee before: HAIER Group Corp. Patentee before: QINGDAO HAIER WASHING MACHINE Co.,Ltd. |
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