CN113731175A - Water purification system and control method thereof - Google Patents
Water purification system and control method thereof Download PDFInfo
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- CN113731175A CN113731175A CN202010481186.2A CN202010481186A CN113731175A CN 113731175 A CN113731175 A CN 113731175A CN 202010481186 A CN202010481186 A CN 202010481186A CN 113731175 A CN113731175 A CN 113731175A
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- 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
- B01D61/08—Apparatus therefor
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- 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
- B01D61/025—Reverse osmosis; Hyperfiltration
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- 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
- B01D61/027—Nanofiltration
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- 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
- B01D61/10—Accessories; Auxiliary operations
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- 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
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- 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
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- 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
- C02F2209/44—Time
- C02F2209/445—Filter life
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Abstract
The invention discloses a water purification system and a control method thereof, wherein the water purification system is characterized in that a flushing filter element is connected in parallel on a pipeline between a water outlet of a booster pump and a water inlet of a main filter element, an air inlet valve is arranged on the water inlet pipeline, and a first electromagnetic valve is arranged on the pipeline between the water outlet of the booster pump and the water inlet of the main filter element; after the water purification is finished, the water inlet valve is closed and the air inlet valve is opened, the operation of the booster pump is controlled, air enters the main filter element to discharge water in front of the membrane of the main filter element, then the air inlet valve and the first electromagnetic valve are closed, the water inlet valve is opened and the filter element wastewater electromagnetic valve is washed, raw water enters the washing filter element, the pure water generated after the washing filter element filters enters the main filter element, the membrane of the main filter element is washed, the inner side and the outer side of the membrane of the main filter element are soaked by the pure water with a lower TDS value, a first cup of water flowing out after the water purification machine is started again is the pure water with a low TDS value, and the technical problem that the TDS of the first cup of water of the existing water purification machine is higher is solved.
Description
Technical Field
The invention belongs to the technical field of water purification, and particularly relates to a water purification system and a control method thereof.
Background
RO water purification machines (or RO reverse osmosis water purification machines/RO water purification machines) are water purification machines that use the principle of reverse osmosis technology for water filtration, and RO reverse osmosis technology is widely used in various fields such as military, medical treatment, industry, civilian use, and the like. Is known as one of the six high technologies in this century.
Along with the increasing severity of environmental pollution and water pollution, the drinking water health of people is seriously threatened, and the RO machine water purification technology is a better way for preparing purified water because various harmful impurities, heavy metals, viruses, bacteria and the like in water can be removed, the efficiency is high, and the removal is thorough.
However, due to the nature of the RO membrane, the water before the membrane and the water after the membrane tend to approach each other after standing for a while by ion diffusion TSD, resulting in a higher TDS of the first cup of pure water. In addition, after a period of time of use, especially for areas with high water hardness, the high concentration of raw water ions on the raw water side of the membrane surface can cause membrane surface crystallization, wherein the joint of the RO membrane bottom and a wastewater port is easy to crystallize, and the membrane blockage is caused.
Disclosure of Invention
The invention aims to provide a water purification system and a control method thereof, which adopt a mode of emptying primary filter element pre-membrane water and flushing the primary filter element to flush the primary filter element before membrane by pure water generated by flushing the filter element, solve the technical problem that the TDS of the first cup of water of the existing water purification machine is higher, and control the TDS value of the primary filter element before membrane below a first preset value by TDS detection of a waste water port of the primary filter element during flushing, thereby realizing the technical effects of intelligently adjusting flushing time and water quantity, preventing crystallization at the joint of a membrane surface, a membrane bottom and the waste water port and avoiding membrane blockage.
In order to solve the technical problems, the invention adopts the following technical scheme:
a water purification system is proposed, comprising: a water inlet pipeline and a pure water outlet pipeline; the water inlet valve is arranged on the water inlet pipeline; a water inlet of the booster pump is connected with the water inlet pipeline; the water inlet of the main filter element is connected with the water outlet of the booster pump, and the water outlet of the main filter element is connected with the pure water outlet pipeline; further comprising: a water inlet of the flushing filter element is connected with a water outlet of the booster pump, and a water outlet of the flushing filter element is connected with a water inlet of the main filter element; a waste water opening of the filter element flushing electromagnetic valve is provided with a filter element flushing waste water electromagnetic valve which is closed when the main filter element produces water; the first electromagnetic valve is arranged on a pipeline between the water outlet of the booster pump and the water inlet of the main filter element; and the air inlet valve is arranged on the water inlet pipeline.
Further, the system further comprises: the first detection device is installed in the waste water port of the main filter element and used for detecting the TDS value of the waste water port of the main filter element.
Further, the system further comprises: and the second detection device is arranged on the water inlet pipeline and used for detecting the TDS value of the raw water.
Further, the system further comprises: and the main filter element wastewater return pipeline is connected between the main filter element wastewater return pipeline and the water inlet pipeline, and a third electromagnetic valve is installed on the main filter element wastewater return pipeline.
A control method of a water purification system is provided, which is applied to the water purification system, and the water purification system comprises: a water inlet pipeline and a pure water outlet pipeline; the water inlet valve is arranged on the water inlet pipeline; a water inlet of the booster pump is connected with the water inlet pipeline; the water inlet of the main filter element is connected with the water outlet of the booster pump, and the water outlet of the main filter element is connected with the pure water outlet pipeline; a water inlet of the flushing filter element is connected with a water outlet of the booster pump, and a water outlet of the flushing filter element is connected with a water inlet of the main filter element; a waste water opening of the filter element flushing electromagnetic valve is provided with a filter element flushing waste water electromagnetic valve which is closed when the main filter element produces water; the first electromagnetic valve is arranged on a pipeline between the water outlet of the booster pump and the water inlet of the main filter element; the air inlet valve is arranged on the water inlet pipeline; the method comprises the following steps: after the water production is stopped, closing the water inlet valve and opening the first electromagnetic valve and the air inlet valve; controlling the booster pump to operate so that air enters the main filter element and water before the air enters the main filter element and is discharged; and closing the air inlet valve and the first electromagnetic valve, and opening the water inlet valve and the flushing filter element wastewater electromagnetic valve so as to enable raw water to enter the flushing filter element, wherein the flushing filter element generates pure water to enter the main filter element to perform pre-membrane flushing.
Further, when the flushing filter element generates pure water to enter the main filter element for performing pre-membrane flushing, the method further comprises the following steps: and detecting the TDS value of the waste water port of the main filter element, and controlling the booster pump to stop running until the TDS value is smaller than a first preset value.
Further, the method further comprises: and limiting the first preset value to be less than or equal to the TDS value of the raw water.
Further, after stopping the water production, the method further comprises: and controlling the booster pump to operate after waiting for a preset time.
Further, the water purification system still includes: the main filter element wastewater return pipeline is connected between the main filter element wastewater pipeline and the water inlet pipeline, and a third electromagnetic valve is installed on the main filter element wastewater return pipeline; when pure water generated by the washing filter element enters the main filter element to perform pre-membrane washing, the method further comprises the following steps: and opening the third electromagnetic valve to enable the wastewater of the main filter element to flow back to the booster pump through the main filter element wastewater backflow pipeline and be mixed with raw water.
Further, the method further comprises: and sending prompt information for exchanging, installing and using the main filter element and the flushing filter element when the service life or the service time of the main filter element reaches a set critical value.
Compared with the prior art, the invention has the advantages and positive effects that: in the water purification system and the control method thereof, a flushing filter element is connected in parallel on a pipeline between a water outlet of a booster pump and a water inlet of a main filter element, an air inlet valve is arranged on the water inlet pipeline, and a first electromagnetic valve is arranged on the pipeline between the water outlet of the booster pump and the water inlet of the main filter element; when water is purified, the air inlet valve and the filter element flushing wastewater electromagnetic valve are closed, the first electromagnetic valve is opened, and the main filter element outputs the pure water; after the water purification is finished, close the water intaking valve and open the admission valve, control the booster pump operation, make the air get into main filter core, discharge the water before the membrane of main filter core, afterwards, close admission valve and first solenoid valve, open the water intaking valve and wash filter core waste water solenoid valve, make the raw water get into and wash the filter core, the pure water that produces after washing the filter core filtration gets into main filter core, execute to washing before the membrane of main filter core, make the main filter core inboard outside all soaked by the pure water of lower TDS value, make the first cup of water that flows after the start once more for the pure water that TDS value is low, solve the technical problem that the first cup of water TDS of current purifier is on the high side.
Furthermore, during the period that the flushing filter element flushes the main filter element, the TDS value of the waste water port of the main filter element is detected through the first detection device, along with the flushing of pure water generated by the flushing filter element, the TDS value in front of the membrane of the main filter element is further gradually reduced, namely the TDS value of the waste water port is gradually reduced, and the booster pump is controlled to stop running until the TDS value is reduced to be less than or equal to a first preset value, so that the flushing of the main filter element is finished; when the first preset value is sufficiently small, the flushing of the flushing filter element can thoroughly clean the key parts of the water channel, such as the front part of the main filter element membrane, the bottom part of the membrane, the connecting part of the wastewater port and the like, so that the water purification system is kept in a pure water TDS state before and after the main filter element membrane after standby, the membrane surface, the bottom part of the membrane and the connecting part of the wastewater port are prevented from crystallizing, the cleanness of the water channel system and the key parts is maintained to the maximum extent, and the self-cleaning effect of the water purification system is achieved.
Furthermore, compared with the existing fixed time or fixed water quantity washing mode, the method is based on the detection of the TDS value of the waste water inlet, and even under the condition of different water qualities, the method can realize that the membranes of the main filter element are all in the same pure water soaking state based on different washing time and washing water quantity by combining the limitation of the first preset value, thereby achieving the technical effect of intelligently adjusting the washing time and the water quantity, solving the problem of RO membrane surface crystallization and saving water to the maximum extent.
Further, detect the raw water TDS value of inlet channel to use the raw water TDS value to inject first default, make to wash and associate with actual quality of water, make to wash and to carry out the differentiation according to different regional quality of water difference and wash.
Further, when washing before the filter core produces the pure water and carries out the membrane to main filter core and wash, the waste water that washes mixes with the raw water before flowing back to the booster pump through main filter core waste water return line, washes the filter core and uses this muddy water to produce the pure water and carry out the membrane to main filter core and wash, plays the technological effect of saving the washing water yield.
Further, when the life of the main filter element reaches a set critical value or the service life of the main filter element reaches the replacement time, a prompt of exchanging, installing and using the main filter element and the flushing filter element is sent, a user is prompted to install the flushing filter element and the exchange position of the main filter element, the flushing filter element executes the function of the main filter element, the main filter element executes the function of the flushing filter element, and the effect of fully and reasonably utilizing the filter element is achieved.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a structural view of a first embodiment of a water purification system according to the present invention;
fig. 2 is a structural view of a second embodiment of a water purification system according to the present invention;
FIG. 3 is a flow chart of a first embodiment of a method for controlling a water purification system according to the present invention;
FIG. 4 is a flow chart illustrating a control method of a water purification system according to a second embodiment of the present invention;
fig. 5 is a system configuration diagram of a third embodiment of the water purification system according to the present invention;
fig. 6 is a system architecture diagram of a fourth embodiment of the water purification system according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The water purification system provided by the invention comprises a water inlet pipeline 1, a pure water outlet pipeline 2, a booster pump 3, a main filter element 4 and a flushing filter element 5, as shown in figure 1; a water inlet of the booster pump 3 is connected with a water inlet pipeline 1, and a water inlet valve 16 and an air inlet valve 15 are installed on the water inlet pipeline 1; the water inlet of the main filter element 4 is connected with the water outlet of the booster pump 3, and the water outlet thereof is connected with the pure water outlet pipeline 2; the water inlet of the flushing filter element 5 is connected with the water outlet of the booster pump 3, and the water outlet thereof is connected with the water inlet of the main filter element 4; a first electromagnetic valve 6 is arranged on a pipeline between the water outlet of the booster pump 3 and the water inlet of the main filter element 4.
A preposed main filter element component 01, such as a PPF primary filter, a UDF filter, a CTO filter and the like, is connected to the water inlet pipeline 1; a post main filter element component, such as a post active carbon filter, a water tap and the like, is connected to the pure water outlet pipeline 2.
The waste water port of the main filter element 4 is connected with a main filter element waste water pipeline 8, and a waste water electromagnetic valve 9 is connected on the main filter element waste water pipeline 8. A waste water port of the flushing filter element 5 is connected with a waste water pipeline 10, and a flushing filter element waste water electromagnetic valve 11 is installed on the waste water pipeline 10; a one-way valve is arranged on a pipeline between the water outlet of the flushing filter element 5 and the water inlet of the main filter element 4.
According to the water purification system provided by the invention, when water is produced, the flushing filter element wastewater electromagnetic valve 11 and the air inlet valve 15 are closed, the first electromagnetic valve 6 and the water inlet valve 16 are opened, water enters the main filter element 4 and the flushing filter element 5 through the booster pump 3, and the flushing filter element wastewater electromagnetic valve 11 is closed, so that the water inlet resistance of the flushing filter element 5 is large, water flows into the main filter element 4, flows out of the pure water outlet pipeline 2 after being filtered by the main filter element 4, and flows out of the faucet after being filtered by the rear main filter element assembly.
The main filter element 4 can be an RO membrane main filter element and also can be an NF nanofiltration main filter element. The booster pump 3 can output two kinds of power, and is respectively suitable for the application of a water production mode and a cleaning mode.
In some embodiments of the present invention, the water in front of the main filter element 4 can be discharged from the main filter element waste water pipeline 8 by controlling the opening of the air inlet valve 15, the closing of the air inlet valve 16 and the operation of the booster pump 3 after the water preparation is finished, so as to prevent the water in front of the main filter element 4 from being soaked by the water with the high TDS value, and to perform the function of reducing the TDS value of the first cup of water.
In some embodiments of the present invention, the membrane pre-flushing of the main filter element 4 by the pure water generated by the flushing filter element 5 can be realized by controlling the first solenoid valve 6 to be closed, the flushing filter element waste water solenoid valve 11 to be opened, and the operation of the booster pump 3 after the water making is finished.
In the embodiment shown in fig. 2, the water purification system of the present invention further includes a first detecting device 13 and a second detecting device 14; the first detection device 13 is installed at the waste water port of the main filter element 4 and is used for detecting the TDS value of the waste water port of the main filter element 4; the second detection device 14 is installed on the water inlet pipeline 1 and used for detecting the TDS value of the raw water. In some embodiments of the invention, the main filter element 4 and the flushing filter element 5 can be switched to work based on the detection and judgment of the TDS value of the waste water port and the TDS value of the raw water, so as to flush the filter element before the membrane, solve the problem of higher TDS value of the first cup of water, realize intelligent regulation of flushing time and water quantity, prevent crystallization at the joint of the membrane surface, the membrane bottom and the waste water port, and avoid the occurrence of membrane blockage.
Specifically, based on the above proposed architecture of the water purification system, the present invention provides a control method of the water purification system, as shown in fig. 3, comprising the following steps:
and step S31, after the water production is stopped, closing the water inlet valve and opening the first electromagnetic valve and the air inlet valve.
According to the water purification system provided by the invention, during water production, the electromagnetic valve 11 for flushing the filter element wastewater and the air inlet valve 16 are closed, the first electromagnetic valve 6 and the booster pump 3 are opened, and after water production is finished, the booster pump 3 is closed.
In the embodiment of the invention, after the water production is stopped, the water inlet valve 16 is closed, and the air inlet valve 15 is opened to prepare for emptying the water before the membrane of the main filter element 4.
The time after the water production is stopped includes any time point after the water production is stopped, for example, when the water production is stopped, waiting for a predetermined time after the water production is stopped, or before the water production is stopped next time.
Step S32: and controlling the booster pump to operate so that air enters the main filter element and water before the membrane is discharged.
After the water preparation is finished, closing the water inlet valve 16, opening the air inlet valve 15, keeping the first electromagnetic valve 6 open, starting the booster pump 3 to run, pumping air from the air inlet valve 15 to the front side of the main filter element 4 by the booster pump 3, and discharging the water in front of the main filter element 4 from the main filter element waste water pipeline 8; in the preferred embodiment of the present invention, after the water production is stopped, the water inlet valve 16 is closed and the operation of the booster pump 3 is stopped, the first solenoid valve 6 and the air inlet valve are opened after waiting for a preset time, and the booster pump 3 is controlled to operate, that is, the main filter element 4 is discharged with the water before the membrane after standing for a certain time. The predetermined time here is preferably 5 to 10 minutes.
The purpose of setting the preset standing time is as follows: on the one hand, the water source waste caused by frequent water drainage when the user frequently uses water is prevented, on the other hand, the first cup of water is guaranteed not to generate TDS exceeding within the preset time, and pure water soaking is maintained behind the front membrane of the main filter element membrane.
Step S33: and closing the air inlet valve and the first electromagnetic valve, and opening the water inlet valve and the flushing filter element wastewater electromagnetic valve so as to enable raw water to enter the flushing filter element, and enabling pure water generated by the flushing filter element to enter the main filter element to perform pre-membrane flushing.
When the water in front of the membrane of the main filter element 4 is emptied or the water discharge process in front of the membrane is carried out for a set time, the air inlet is stopped, and the air inlet valve 15 is closed. The detection of whether the membrane front water is emptied is realized by installing a flow sensor at a waste water port of the main filter element 4 or detecting a TDS value of the waste water port; the set time is limited to ensure that the water is emptied before the main filter element membrane, and the like.
Then, a water inlet valve 16 and a filter element flushing wastewater electromagnetic valve 11 are opened, raw water flows into a flushing filter element 5 through a booster pump 3, pure water filtered by the flushing filter element 5 flows into a main filter element 4, and air in front of the membrane of the main filter element 4 is discharged from a main filter element wastewater pipeline 8; the waste water for washing the filter element 5 flows out from the waste water electromagnetic valve 11 for washing the filter element.
After 4 membrane front air of main filter core were arranged completely and are extruded, soak by the pure water before the membrane of main filter core 4 for the first cup of water that flows after the start again is the pure water that the TDS value is low, solves the technical problem that the first cup of water TDS of current purifier is on the high side.
The detection that the air in front of the membrane of the main filter element 4 is completely expelled can be realized by installing a flow sensor at a waste water port of the main filter element 4 or limiting the set time of water production of the flushing filter element 5; the set time is defined in relation to the capacity of the main cartridge 4 to ensure that the air is evacuated to the limit before the main cartridge membrane.
In some embodiments of the present invention, as shown in FIG. 4, during the execution of step S33, the following step, step S34, is also executed: and detecting the TDS value of the waste water port of the main filter element, and controlling the booster pump 3 to stop running until the TDS value is smaller than a first preset value.
During the execution of step S33, when the air in front of the main filter element 4 is completely expelled, the waste water solenoid valve 9 is kept open, so that the pure water prepared by the flushing filter element 5 flushes the membrane of the main filter element 4, and the flushing water flows out through the waste water pipeline 8 of the main filter element, at this time, the water purification system obtains the TDS value of the waste water outlet detected by the first detection device 13, and the TDS value of the waste water outlet gradually decreases along with the continuous execution of step S33, and after the value decreases to the first preset value, the booster pump 3 is controlled to stop operating.
At the moment, the inner side and the outer side of the main filter element 4 membrane can be soaked by the pure water with a lower TDS value, so that the first cup of water flowing out after the water dispenser is started again is the pure water with a low TDS value.
Compared with the problems of insufficient flushing and uncontrollable flushing state in a flushing mode with fixed time or fixed water quantity in the prior art, the mode for controlling the cleaning process based on the TDS value of the waste water port has the advantages that based on the detection of the TDS value of the waste water port, even under the condition of different water qualities, the membranes of the main filter element 4 are in the same pure water soaking state by combining the limitation of a first preset value, the technical effect of intelligently adjusting the flushing time and the water quantity is achieved, the problem of RO membrane surface crystallization is solved, and meanwhile, water is saved to the maximum extent. In practical application, the upper limit of the flushing time can be limited, and the condition that flushing is ceaselessly performed due to faults or water quality is avoided.
This first default reaches best washing efficiency and effect as the principle with the pure water that satisfies to wash filter core 5 and produce to main filter core 4, general minimum is not less than the TDS value when washing filter core 5 stable system water, the maximum value does not let the first cup of water of system of stewing for a long time exceed standard, make water purification system after the standby, main filter core 4 membrane before all keep at pure water TDS state behind the membrane, thereby prevent the membrane surface, at the bottom of the membrane and waste water inlet connecting portion crystallization, furthest's the cleanness of maintaining waterway system and key parts, reach the effect of water purification system automatically cleaning.
In some embodiments of the present invention, the present invention detects the TDS value of the raw water based on the second detection device 14 installed on the water inlet pipeline, and may define the first preset value based on the TDS value of the raw water, and the first preset value is defined to be less than or equal to the TDS value of the raw water, preferably 0.15 times of the TDS value of the raw water, so as to associate the flushing with the local actual water quality, so that the flushing can be cleaned differently according to the water quality difference of different areas.
In some embodiments of the present invention, as shown in fig. 6, the water purification system further includes a main filter wastewater return line 43 connected between the main filter wastewater return line 8 and the water inlet line 1, and a third solenoid valve 44 installed on the main filter wastewater return line 43; when the flushing filter element 5 filters pure water generated after raw water enters the main filter element 4 to perform pre-membrane flushing, the third electromagnetic valve 44 is controlled to be opened, so that the flushed wastewater flows back to the water inlet in front of the booster pump 3 from the main filter element wastewater return pipeline 43 to be mixed with the raw water, the mixed water enters the flushing filter element 5 again, and the flushing filter element 5 filters the pure water to continue to perform pre-membrane flushing on the main filter element 4. The connection point of the main filter wastewater return line 43 and the main filter wastewater line 8 is between the first detection device 13 and the wastewater solenoid valve 9.
Because the waste water TDS value of itself before the membrane of main filter core 4 is washed to the pure water is different, based on this main filter core waste water return line 43 and the project organization of third solenoid valve 44, can play the purpose of using water wisely to waste water reuse.
In a preferred embodiment of the invention, the main filter element 4 and the flushing filter element 5 can be used interchangeably to achieve a sufficiently rational application of the filter elements. Generally, the service life of the main filter element 4 is long and the frequency is high, while the service life of the flushing filter element 5 is short and the frequency is low, so the service life of the main filter element is shorter than that of the flushing filter element 5, correspondingly, as shown in fig. 5, the water purification system in this embodiment further includes a prompt module 15, when the service life of the main filter element 4 reaches a set critical value, for example, the set critical value is 80% of the service life, or 80% of the service life, and the like, the water purification system sends a prompt message to a user to prompt the user to exchange positions of the flushing filter element and the main filter element for use, the two filter elements after the exchange positions, the main filter element 4 performs a function of flushing the filter element based on the remaining 20% of the service life or the service life, and the flushing filter element 5 performs a function of the main filter element.
In some embodiments of the present invention, the transposition time of the main filter element 4 and the flushing filter element 5 is adjusted to a node, which ensures that the time left by the main filter element 4 for implementing pure water flushing is the same as the time left by the flushing filter element 5 for implementing the main filter element for water purification, so as to ensure that the two filter elements are exhausted at the same time, so that the user can replace the filter elements at the same time, and the complexity of replacing the filter elements by the user is reduced.
Generally, the flushing time is determined according to the actual filter flask structure and the volume size of the flushing filter element 5, and when the flushing filter element 5 and the main filter element 4 are not used interchangeably, the flushing time is determined according to the actual filter flask structure and the volume size of the two filter elements.
It should be noted that the above-mentioned estimation of the service life of the filter element according to the present invention is implemented by using the prior art means, but the present invention does not require the limited technical means.
It should be noted that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also make changes, modifications, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A water purification system comprising:
a water inlet pipeline and a pure water outlet pipeline;
the water inlet valve is arranged on the water inlet pipeline;
a water inlet of the booster pump is connected with the water inlet pipeline;
the water inlet of the main filter element is connected with the water outlet of the booster pump, and the water outlet of the main filter element is connected with the pure water outlet pipeline;
it is characterized by also comprising:
a water inlet of the flushing filter element is connected with a water outlet of the booster pump, and a water outlet of the flushing filter element is connected with a water inlet of the main filter element; a waste water opening of the filter element flushing electromagnetic valve is provided with a filter element flushing waste water electromagnetic valve which is closed when the main filter element produces water;
the first electromagnetic valve is arranged on a pipeline between the water outlet of the booster pump and the water inlet of the main filter element;
and the air inlet valve is arranged on the water inlet pipeline.
2. The water purification system of claim 1, further comprising:
the first detection device is installed in the waste water port of the main filter element and used for detecting the TDS value of the waste water port of the main filter element.
3. The water purification system of claim 2, further comprising:
and the second detection device is arranged on the water inlet pipeline and used for detecting the TDS value of the raw water.
4. The system of claim 1, further comprising:
and the main filter element wastewater return pipeline is connected between the main filter element wastewater return pipeline and the water inlet pipeline, and a third electromagnetic valve is installed on the main filter element wastewater return pipeline.
5. A control method of a water purification system is applied to the water purification system, and the water purification system comprises:
a water inlet pipeline and a pure water outlet pipeline;
the water inlet valve is arranged on the water inlet pipeline;
a water inlet of the booster pump is connected with the water inlet pipeline;
the water inlet of the main filter element is connected with the water outlet of the booster pump, and the water outlet of the main filter element is connected with the pure water outlet pipeline; a waste water opening of the filter element flushing electromagnetic valve is provided with a filter element flushing waste water electromagnetic valve which is closed when the main filter element produces water;
a water inlet of the flushing filter element is connected with a water outlet of the booster pump, and a water outlet of the flushing filter element is connected with a water inlet of the main filter element;
the first electromagnetic valve is arranged on a pipeline between the water outlet of the booster pump and the water inlet of the main filter element;
the air inlet valve is arranged on the water inlet pipeline;
characterized in that the method comprises:
after the water production is stopped, closing the water inlet valve and opening the first electromagnetic valve and the air inlet valve;
controlling the booster pump to operate so that air enters the main filter element and water before the air enters the main filter element and is discharged;
and closing the air inlet valve and the first electromagnetic valve, and opening the water inlet valve and the flushing filter element wastewater electromagnetic valve so as to enable raw water to enter the flushing filter element, wherein the flushing filter element generates pure water to enter the main filter element to perform pre-membrane flushing.
6. The water purification system control method of claim 5, wherein when the flushing cartridge produces pure water and enters the main cartridge to perform pre-membrane flushing, the method further comprises:
and detecting the TDS value of the waste water port of the main filter element, and controlling the booster pump to stop running until the TDS value is smaller than a first preset value.
7. The water purification system control method of claim 6, further comprising:
and limiting the first preset value to be less than or equal to the TDS value of the raw water.
8. The water purification system control method of claim 5, wherein after stopping the production of water, the method further comprises:
and controlling the booster pump to operate after waiting for a preset time.
9. The water purification system control method of claim 5,
the water purification system still includes:
the main filter element wastewater return pipeline is connected between the main filter element wastewater pipeline and the water inlet pipeline, and a third electromagnetic valve is installed on the main filter element wastewater return pipeline;
when pure water generated by the washing filter element enters the main filter element to perform pre-membrane washing, the method further comprises the following steps:
and opening the third electromagnetic valve to enable the wastewater of the main filter element to flow back to the booster pump through the main filter element wastewater backflow pipeline and be mixed with raw water.
10. The water purification system control method of claim 5, further comprising:
and sending prompt information for exchanging, installing and using the main filter element and the flushing filter element when the service life or the service time of the main filter element reaches a set critical value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010481186.2A CN113731175A (en) | 2020-05-31 | 2020-05-31 | Water purification system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010481186.2A CN113731175A (en) | 2020-05-31 | 2020-05-31 | Water purification system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113731175A true CN113731175A (en) | 2021-12-03 |
Family
ID=78727884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010481186.2A Pending CN113731175A (en) | 2020-05-31 | 2020-05-31 | Water purification system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113731175A (en) |
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2020
- 2020-05-31 CN CN202010481186.2A patent/CN113731175A/en active Pending
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