CN114074968B - Water purification system and control method thereof - Google Patents

Water purification system and control method thereof Download PDF

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Publication number
CN114074968B
CN114074968B CN202010812994.2A CN202010812994A CN114074968B CN 114074968 B CN114074968 B CN 114074968B CN 202010812994 A CN202010812994 A CN 202010812994A CN 114074968 B CN114074968 B CN 114074968B
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China
Prior art keywords
water
tds value
way valve
pure water
filter element
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CN202010812994.2A
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Chinese (zh)
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CN114074968A (en
Inventor
崔炳俊
杨磊
武中华
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Qingdao Haier Strauss Water Equipment Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Strauss Water Equipment Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202010812994.2A priority Critical patent/CN114074968B/en
Publication of CN114074968A publication Critical patent/CN114074968A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • 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
    • 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
    • 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]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/10—Location of water treatment or water treatment device as part of a potable water dispenser, e.g. for use in homes or offices

Abstract

The invention discloses a water purification system and a control method thereof, wherein the water purification system comprises an RO filter element, a waste water pipeline, a tap, a three-way valve and a drainage branch; the input end of the three-way valve is connected with the water outlet of the RO filter element through a first pipeline, and the first output end of the three-way valve is connected with a water purifying pipeline; one end of the drainage branch is connected with the second output end of the three-way valve, and the other end of the drainage branch is communicated with the waste water pipeline; during the water production, the three-way valve is controlled to be switched to the first output end for output; during non-water making, when meeting first settlement condition, control three-way valve switches to its second output and exports to realize discharging the filtration side pure water of RO filter core through the drainage branch road, first cup water when guaranteeing the user water intaking is the safe water of low TDS value, compares prior art, and this scheme can not increase the volume of product, simultaneously, because carry out the drainage during non-water making, guaranteed that the pure water of RO filter core filtration side remains in low TDS state all the time, need not the user wait when the water intaking.

Description

Water purification system and control method thereof
Technical Field
The invention belongs to the technical field of household water purification, and particularly relates to a water purification system and a control method thereof.
Background
The RO (reverse osmosis) filter element filters water based on the reverse osmosis technology principle; due to the nature of the RO membrane itself, the water before the membrane and the water after the membrane after standing for a period of time tend to approach each other by ion diffusion TSD (total dissolved solids), resulting in a higher TDS of the first cup of purified water.
In the prior art, in order to reduce the TDS value of the first cup of pure water, the following methods are generally adopted: 1. storing raw water or prepared pure water in a storage tank, and cleaning an RO filter element by using the water in the storage tank; 2. cleaning the RO filter element by using water filtered by the auxiliary filter element; 3. before using the water purification mechanism, the filter element is started for a period of time, and the water with high TDS value is discharged.
Among the above various modes, the adoption of the storage tank and the auxiliary filter element increases the cost and also leads to the overlarge volume of the product, and the mode of firstly discharging water with high TDS value increases the waiting time of users.
Disclosure of Invention
The invention aims to provide a water purification system and a control method thereof, which can use pure water with low TDS value without waiting while not increasing the volume of a product by combining a low-cost waterway structure and a control mode.
The invention is realized by adopting the following technical scheme:
a water purification system is proposed, comprising: the RO filter element comprises a water inlet, a water outlet and a waste water port; the water inlet is connected with a water source; the waste water pipeline is connected with a waste water port of the RO filter element; the water tap is connected with the water outlet of the RO filter element through a water purifying pipeline; further comprises: the three-way valve comprises an input end, a first output end and a second output end, wherein the input end is connected with the water outlet of the RO filter element through a first pipeline; the first output end is connected with the water purifying pipeline; one end of the drainage branch is connected with the second output end of the three-way valve, and the other end of the drainage branch is communicated with the waste water pipeline; during the water production, the three-way valve is switched to the first output end of the three-way valve for output; during non-water production, when pure water on the filtration side of the RO filter core is discharged through the water discharge branch, the three-way valve is switched to the second output end for output.
Further, the system further comprises: the TDS detection device is arranged at the water outlet of the RO filter element, the input end of the three-way valve or the first pipeline and is used for detecting the TDS value of pure water at the filtering side of the RO filter element; and during the non-water production period, the three-way valve is controlled to be switched or closed based on the TDS value of the pure water at the filtering side.
Further, the system further comprises: a brightness sensor for detecting the ambient light brightness of the water purification system; and during the non-water making period, the three-way valve is controlled to be switched or closed based on the ambient light brightness.
A water purification system control method is proposed, the water purification system comprising: the RO filter element comprises a water inlet, a water outlet and a waste water port; the water inlet is connected with a water source; the waste water pipeline is connected with a waste water port of the RO filter element; the water tap is connected with the water outlet of the RO filter element through a water purifying pipeline; the input end is connected with the water outlet of the RO filter element through a first pipeline; the first output end is connected with the water purifying pipeline; one end of the drainage branch is connected with the second output end of the three-way valve, and the other end of the drainage branch is communicated with the waste water pipeline; the method comprises the following steps: during the water production, the three-way valve is controlled to be switched to the first output end for output; and during the non-water making period, when the first set condition is met, the three-way valve is controlled to be switched to the second output end of the three-way valve for outputting so as to realize the discharge of pure water on the filtering side of the RO filter element through the drainage branch.
Further, the first setting condition specifically includes: the water making end meets the first set time; or the filtration side pure water TDS value of the RO filter element exceeds a first preset TDS value.
Further, the first setting condition is one of the following two conditions that are satisfied first: the water making end meets the first set time; or the filtration side pure water TDS value of the RO filter element exceeds a first preset TDS value.
Further, the first setting condition specifically includes: the ambient light brightness of the water purification system is higher than the preset brightness, the water making end meets the second set time, and/or the filtration side pure water TDS value of the RO filter element exceeds the second preset TDS value.
Further, the first setting condition further includes: the ambient light brightness of the water purification system is lower than the preset brightness, the water production end meets a third set time, and/or the filtration side pure water TDS value of the RO filter element exceeds a third preset TDS value.
Further, during the discharging of the pure water of the RO cartridge through the drain branch, the method further comprises: closing the three-way valve when a second set condition is met; the second setting condition specifically includes: the drainage meets the fourth set time; or the filtration side pure water TDS value of the RO filter core is lower than a fourth preset TDS value.
Further, during the discharging of the pure water of the RO cartridge through the drain branch, the method further comprises: closing the three-way valve when a third setting condition is met; the third setting condition is one of the following two conditions that are satisfied first: the drainage meets the fifth set time; or the filtration-side pure water TDS value of the RO filter core is lower than a fifth preset TDS value.
Compared with the prior art, the invention has the advantages and positive effects that: according to the water purification system and the control method, the three-way valve is arranged at the water outlet side of the RO filter element, the water drainage branch is additionally arranged between the second output end of the three-way valve and the waste water pipeline of the RO filter element, and the pure water with a high TDS value is discharged from the waste water pipeline in a periodical and/or detection mode of the TDS value of the pure water at the filtering side of the RO filter element during the non-water-making period of the water purification system by controlling the output passage of the three-way valve.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
Fig. 1 is a block diagram of a first embodiment of a water purification system according to the present invention;
fig. 2 is a block diagram of a second embodiment of a water purification system according to the present invention;
FIG. 3 is a block diagram of a third embodiment of a water purification system according to the present invention;
FIG. 4 is a flow chart of a control method of a water purification system according to the present invention;
FIG. 5 is a flow chart of a control method of a water purification system according to a first embodiment of the present invention;
FIG. 6 is a flow chart of a control method of a water purification system according to a second embodiment of the present invention;
FIG. 7 is a flow chart of a control method of a water purification system according to a third embodiment of the present invention;
FIG. 8 is a flow chart of a control method of a water purification system according to a fourth embodiment of the present invention;
FIG. 9 is a flow chart of a water purification system control method in a fifth embodiment of the present invention;
FIG. 10 is a flowchart of a water purification system control method according to a sixth embodiment of the present invention;
FIG. 11 is a flow chart of a control method of a water purification system according to a seventh embodiment of the present invention;
fig. 12 is a flowchart of a water purification system control method according to an eighth embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The water purification system provided by the invention aims at timely discharging high-TDS value pure water generated by permeation on the filtering side of the RO filter element in a non-water-making period through three-way valve control and combination with reconstruction of a drainage branch, so as to ensure that a user takes water to obtain high-quality pure water with a low TDS value all the time, and concretely comprises the RO filter element 1, a waste water pipeline 2, a water tap 3, a three-way valve 4 and a drainage branch 5 as shown in figure 1.
The RO filter element 1 comprises a water inlet a, a water outlet b and a wastewater outlet c; the water inlet a is connected with a water source; the waste water pipeline 2 is connected with a waste water port c of the RO filter element 1; the tap 3 is connected with the water outlet b of the RO filter element 1 through a water purifying pipeline 6.
The three-way valve 4 comprises an input end, a first output end and a second output end, wherein the input end is connected with the water outlet b of the RO filter element 1 through a first pipeline 7; the first output end is connected with a water purifying pipeline 6; one end of the drainage branch 5 is connected to the second output end of the three-way valve 4, and the other end is communicated with the waste water pipeline 2.
Based on the water purifying system proposed above, the three-way valve 4 can be switched to the first output end thereof for output during the water preparation, so that the pure water filtered by the RO filter element 1 flows out of the water tap 3; the three-way valve 4 is switched to its second output end output when discharging the pure water on the filtration side of the RO cartridge 1 through the drain branch 5 during non-water making, and a specific control method of the water purification system for discharging the pure water on the filtration side of the RO cartridge 1 through the drain branch 5 during non-water making will be described in detail later.
In some embodiments of the present invention, as shown in fig. 2, the water purification system further includes a pre-filter 8, a post-filter 9, and a booster pump 10, and the water source filtered through the pre-filter 8 is input into the RO filter 1 through the booster pump 10. The pure water filtered by the RO filter element 1 flows out of the water tap 3 after being further filtered by the post filter element 9.
In some embodiments of the present invention, as shown in fig. 3, the water purification system further includes a TDS detection device 11, which may be installed at the water outlet b of the RO filter element 1, the input end of the three-way valve 4, or the first pipeline 7, for detecting the TDS value of pure water on the filtration side of the RO filter element; during non-water production, when the TDS value of the pure water on the filtration side exceeds the standard, the pure water on the filtration side of the RO filter element 1 can be discharged from the drainage branch 5 by switching the second output end of the three-way valve 4 until the TDS value of the pure water on the filtration side is lower than the set TDS value, thereby ensuring that pure water with a low TDS value is used when a user takes water.
In some embodiments of the present invention, the water purification system further comprises a brightness sensor for detecting the ambient light brightness of the water purification system; during the non-water making period, different water draining control can be implemented according to different ambient light brightness; for example, when the ambient light level is lower than the preset level, the second output end of the three-way valve 4 may be switched according to a longer interval period or the upper limit of the standard TDS value as a condition to discharge the pure water on the filtration side of the RO cartridge 1 from the drain branch 5; when the ambient light level is higher than the preset level, the second output end of the three-way valve 4 may be switched according to a shorter interval period or the lower limit of the standard TDS value as a condition to discharge the filtered-side pure water of the RO cartridge 1 from the drain branch 5.
Based on the water purification system, the invention provides a control method of the water purification system, which aims to timely discharge pure water with high TDS value on the filtering side of the RO filter element 1 through the drainage branch 5 during non-water production period, and ensure that the obtained safe pure water with low TDS value is obtained all the time when a user takes water.
Specifically, as shown in fig. 4, the method comprises the following steps:
step S41: during the water production, the three-way valve is controlled to be switched to the first output end for output.
The system can determine the occurrence of the water making event by detecting the open state of the tap 3, or by determining the pressure of the pressure valve before the tap 3 is installed, and the present invention is not particularly limited.
And S42, during the non-water making period, when the first set condition is met, controlling the three-way valve to be switched to the second output end of the three-way valve for outputting so as to realize the discharge of pure water on the filtering side of the RO filter core through the drainage branch.
Likewise, the system may determine the stop of the water making event by detecting the closed state of the water tap 3, or may determine the stop of the water making event by determining the pressure of the pressure valve before being installed in the water tap 3, and the present invention is not particularly limited.
In some embodiments of the invention, the first setting condition is: the water making end meets the first set time; or the filtration-side pure water TDS value of the RO filter element exceeds the first preset TDS value.
In some embodiments of the present invention, the first set condition is one of the following two conditions that is satisfied first: the water making end meets the first set time; or the filtration-side pure water TDS value of the RO filter element exceeds the first preset TDS value.
In some embodiments of the invention, the first setting condition is: the ambient light brightness of the water purification system is higher than the preset brightness, and the water making end meets the second set time, and/or the filtration side pure water TDS value of the RO filter core exceeds the second preset TDS value.
In some embodiments of the invention, the first setting condition is: the ambient light brightness of the water purification system is lower than the preset brightness, the water making end meets the third set time, and/or the filtration side pure water TDS value of the RO filter core exceeds the third preset TDS value.
Step S43: and closing the three-way valve when the second setting condition is met.
During the non-water-making period, during the pure water of the RO filter core is discharged through the water discharge branch, whether the current state of the water purifying system meets a second set condition is judged, the second set condition needs to ensure that pure water with a high TDS value is completely discharged, and pure water on the filtering side of the RO filter core is safe pure water with a low TDS value.
If the second set condition is met, the three-way valve is closed, the pure water discharge is stopped, and the step S41 or S42 is returned to, so that the safety pure water with the low TDS value is ensured when the user takes water, namely, the water purification system prepares water.
The second setting condition here includes, but is not limited to, a fourth setting time; and/or the filtration-side pure water TDS value of the RO filter element is lower than the fourth preset TDS value.
In some embodiments of the present invention, the three-way valve is closed and the discharge of pure water is stopped when a third set condition is satisfied, the third set condition being one of the following two conditions that is satisfied first: fifth set time; or the filtration side pure water TDS value of the RO filter core is lower than the fifth preset TDS value
The following describes the control method of the water purification system according to several specific embodiments.
In the following embodiments, the control in step S41, that is, the control during the water production period, may be performed according to the prior art, in which the three-way valve 4 is switched to the first output end during the water production period, and the three-way valve 4 is closed when the water production is completed.
The following examples mainly detail the water purification system control method during non-water production.
Example 1
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: the water making end meets the first set time, the water discharging is finished by adopting the second set condition, and the water discharging duration through the water discharging branch 5 meets the fourth set time.
Then, as shown in fig. 5, during the non-water-making period after the water making is finished, the system detects whether the water making ending time reaches the first set time, if yes, the three-way valve 4 is switched to the second output end thereof, so that the pure water with high TDS value generated by permeation on the filtering side of the RO filter element 1 is discharged from the drainage branch 5.
When the fourth set time is satisfied, the three-way valve 4 is closed when the pure water is discharged from the drain branch 5.
Repeating the steps, namely, switching the three-way valve again to drain water from the drainage branch after the first set time, and closing the three-way valve 4 after the fourth set time of drainage until water is produced next time, so as to ensure that the TDS value of pure water on the filtration side of the RO filter element is always maintained in a safe pure water state during the non-water producing period, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
Example two
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: the filtration side pure water TDS value of the RO filter element exceeds a first preset TDS value, and the water discharge is finished by adopting a second setting condition, which is that: the filtration side pure water TDS value of the RO filter element is lower than the fourth preset TDS value.
Then, as shown in fig. 6, during the non-water-making period after the water-making is completed, the TDS detection means detects the TDS value of the pure water on the filtration side of the RO cartridge 1, and when the TDS value of the pure water on the filtration side is higher than the first preset TDS value, the three-way valve 4 is switched to the second output end thereof, so that the pure water with a high TDS value generated by permeation on the filtration side of the RO cartridge 1 is discharged from the drain branch 5.
While the pure water is discharged from the drain branch 5, the TDS detection means continues to detect the TDS value of the pure water on the filtration side of the RO cartridge 1, and when the TDS value of the pure water on the filtration side is lower than the fourth preset TDS value, the three-way valve 4 is closed.
And repeating the steps, namely, when the TDS value of the pure water on the filtering side is higher than the first preset TDS value, switching the three-way valve again to drain water from the drainage branch, and closing the three-way valve 4 after the TDS value of the pure water on the filtering side is lower than the fourth preset TDS value until water is produced next time, so as to ensure that the TDS value of the pure water on the filtering side of the RO filter element is always maintained in a safe pure water state during non-water production period, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
Example III
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: the water making end meets the first set time, and the water discharging end adopts the second set condition, which is that: the filtration side pure water TDS value of the RO filter element is lower than the fourth preset TDS value.
As shown in fig. 7, during the non-water-making period after the water making is finished, the system detects whether the water making end time reaches the first set time, if yes, the three-way valve 4 is switched to the second output end thereof, so that the pure water with high TDS value generated by the permeation on the filtering side of the RO filter element 1 is discharged from the drainage branch 5.
The TDS detection means detects the TDS value of the pure water on the filtration side of the RO cartridge 1 when the TDS value of the pure water on the filtration side is lower than a fourth preset TDS value, and closes the three-way valve 4 when the pure water is discharged from the drain branch 5.
Repeating the steps, namely, switching the three-way valve again to drain water from the drainage branch after the first set time, and closing the three-way valve 4 after the TDS value of the pure water on the filtering side is lower than the fourth preset TDS value until water is produced next time, so as to ensure that the TDS value of the pure water on the filtering side of the RO filter element is always maintained in a safe pure water state during the non-water producing period, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
Example IV
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: the filtration side pure water TDS value of the RO filter element exceeds a first preset TDS value, and the water discharge is finished by adopting a second setting condition, which is that: the duration of the drainage through the drainage branch 5 satisfies the fourth set time.
As shown in fig. 8, during non-water-making after water-making is completed, the TDS detection means detects the TDS value of pure water on the filtration side of the RO cartridge 1, and when the TDS value of pure water on the filtration side is higher than the first preset TDS value, the three-way valve 4 is switched to its second output end so that pure water with a high TDS value generated by permeation on the filtration side of the RO cartridge 1 is discharged from the drain branch 5.
The time during which pure water is discharged from the drain branch 5 is counted, and when the fourth set time is satisfied, the three-way valve 4 is closed.
And repeating the steps, namely, when the TDS value of pure water on the filtering side is higher than a first preset TDS value, switching the three-way valve again to drain water from the drainage branch, and closing the three-way valve 4 after a fourth set time of drainage until water is produced next time, so as to ensure that the TDS value of pure water on the filtering side of the RO filter element is always maintained in a safe pure water state during non-water production period, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
Example five
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: the water making end meets the first set time, or the filtration side pure water TDS value of the RO filter element exceeds the first preset TDS value, and one of the two is met; and (3) ending the water drainage by adopting a third setting condition, which is as follows: the duration of the water discharge through the water discharge branch 5 satisfies the fifth set time, or the TDS value of the pure water on the filtration side of the RO filter element is lower than the fifth preset TDS value, and the first satisfied one of the two is the criterion.
Then, as shown in fig. 9, during the non-water-making period after the water making is finished, the system counts the water making end time, and the TDS detection device detects the TDS value of the pure water on the filtering side of the RO filter element 1, if the counted time reaches the first set time, but the TDS value of the pure water on the filtering side does not reach the first preset TDS value, the three-way valve 4 is switched to the second output end thereof under the first set time as the first set condition, so that the pure water with the high TDS value generated by the permeation on the filtering side of the RO filter element 1 is discharged from the drainage branch 5; if the timing does not reach the first set time and the TDS value of the pure water on the filtration side has exceeded the first preset TDS value, the three-way valve 4 is switched to the second output end thereof under the first preset TDS value as the first set condition, so that the pure water with high TDS value generated by permeation on the filtration side of the RO filter element 1 is discharged from the drain branch 5.
The time is counted again during the pure water discharging from the water discharging branch 5, and the TDS detection means continues to detect the TDS value of the pure water on the filtration side of the RO cartridge 1, and the three-way valve 4 is closed when one of the fifth set time and the TDS value of the pure water on the filtration side is lower than the fifth preset TDS value is satisfied.
And repeating the steps, namely, when one of the first set time and the condition that the TDS value of pure water on the filtering side is higher than the first preset TDS value is met, switching the three-way valve again to drain water from the drainage branch, and when one of the fifth set time and the condition that the TDS value of pure water on the filtering side is lower than the fifth preset TDS value is met, closing the three-way valve 4 until water is produced next time, so as to ensure that the TDS value of pure water on the filtering side of the RO filter element is always maintained in a safe pure water state during non-water production, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
Example six
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: when the ambient light brightness is higher than the preset brightness, the water making end meets the second set time, and when the ambient light brightness is lower than the preset brightness, the water making end meets the third set time; the second setting condition is adopted for ending the drainage, and the method is as follows: the duration of the drainage through the drainage branch 5 satisfies the fourth set time.
Then, as shown in fig. 10, the brightness sensor detects the ambient light brightness of the water purification system, and if the ambient light brightness is higher than the preset brightness (the preset brightness is usually set as the period of frequent water use by the user when the ambient light brightness is higher than the preset brightness and the period of relatively low water use frequency by the user when the ambient light brightness is lower than the preset brightness) in the non-water-making period after the water making is finished, the system detects whether the water making end time reaches the second set time, if so, the three-way valve 4 is switched to the second output end of the three-way valve, so that the pure water with high TDS value generated by permeation on the filtering side of the RO filter element 1 is discharged from the drainage branch 5.
If the ambient light brightness is lower than the preset brightness, the system detects whether the water making ending time reaches the third set time, if yes, the three-way valve 4 is switched to the second output end of the three-way valve, so that pure water with high TDS value generated by permeation on the filtering side of the RO filter element 1 is discharged from the drainage branch 5.
In some embodiments of the present invention, the second setting time may be set to be smaller than the third setting time, so as to shorten the drainage period and improve the water quality when the ambient light brightness is higher than the preset brightness, i.e. the user uses water frequently, and to properly increase the drainage period when the ambient light continuous reading is lower than the preset brightness, i.e. the user does not use water frequently or not, so as to avoid water resource waste.
The three-way valve 4 is closed when the drain water satisfies the fourth set time, while the pure water is discharged from the drain branch 5.
And repeating the steps, namely, switching the three-way valve again to drain water from the drainage branch after the second set time or the third set time, and closing the three-way valve 4 after the fourth set time of drainage until water is produced next time, so as to ensure that the TDS value of pure water on the filtration side of the RO filter element is always maintained in a safe pure water state during the non-water production period, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
In this embodiment, the preset brightness can be set in combination with a time period, and the time period (daytime or night with illumination) for which the user frequently uses water is higher; the preset brightness is low for periods of time when the user is using little or no water (typically at night or without illumination).
Example seven
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: when the ambient light brightness is higher than the preset brightness, the filtered-side pure water TDS value of the RO filter element exceeds a second preset TDS value, and when the ambient light brightness is lower than the preset brightness, the filtered-side pure water TDS value of the RO filter element exceeds a third preset TDS value; the second setting condition is adopted for ending the drainage, and the method is as follows: the filtration side pure water TDS value of the RO filter element is lower than the fourth preset TDS value.
Then, as shown in fig. 11, the brightness sensor detects the ambient light brightness of the water purification system, and if the ambient light brightness is higher than the preset brightness (the preset brightness is usually set as the period when the user frequently uses water when the ambient light brightness is higher than the preset brightness and the period when the user uses water with relatively low frequency when the ambient light brightness is lower than the preset brightness) in the non-water-making period after the water making is finished, the system detects whether the TDS value of the pure water on the filtration side of the RO filter element exceeds the second preset TDS value, if yes, the three-way valve 4 is switched to the second output end of the three-way valve, so that the pure water with high TDS value generated by the filtration side of the RO filter element 1 is discharged from the drainage branch 5.
If the ambient light brightness is lower than the preset brightness, the system detects whether the pure water TDS value at the filtering side of the RO filter element exceeds a third preset TDS value, if so, the three-way valve 4 is switched to the second output end of the three-way valve, so that the pure water with high TDS value generated by permeation at the filtering side of the RO filter element 1 is discharged from the drainage branch 5.
In some embodiments of the present invention, the second preset TDS value may be set to be smaller than the third preset TDS value, so as to improve the quality of water when the ambient light brightness is higher than the preset brightness, i.e. the user uses water frequently, and properly reduce the quality of pure water when the ambient light brightness is lower than the preset brightness, i.e. the user does not use water frequently or not, so as to avoid the waste of water resources; here, the second preset TDS value is, for example, the minimum value of the standard pure water TDS value, and the second preset TDS value is, for example, the maximum value of the standard pure water TDS value.
While the pure water is discharged from the drain branch 5, the TDS detection means continues to detect the TDS value of the pure water on the filtration side of the RO cartridge 1, and when the TDS value of the pure water on the filtration side is lower than the fourth preset TDS value, the three-way valve 4 is closed.
And repeating the steps, namely, when the TDS value of the pure water on the filtering side is higher than the second preset TDS value or the third preset TDS value, switching the three-way valve again to drain water from the drainage branch, and closing the three-way valve 4 after the TDS value of the pure water on the filtering side is lower than the fourth preset TDS value until water is produced next time, so as to ensure that the TDS value of the pure water on the filtering side of the RO filter element is always maintained in a safe pure water state during non-water production period, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
The preset brightness can be set in combination with time, and the preset brightness is higher for a period of time (daytime or night with illumination) when the user frequently uses water; the preset brightness is low for periods of time when the user is using little or no water (typically at night or without illumination).
Example eight
In this embodiment, the first setting conditions for performing RO cartridge filtration side drainage during non-water making are: when the ambient light brightness is higher than the preset brightness, the water making end meets the second setting time or the filtration side pure water TDS value of the RO filter element exceeds the second preset TDS value, and one of the two is met; when the ambient light brightness is lower than the preset brightness, the water making end meets the third setting time or the filtration side pure water TDS value of the RO filter element exceeds the third preset TDS value, and one of the two is met; and (3) ending the water drainage by adopting a third setting condition, which is as follows: the draining time length satisfies the fifth setting time or the filtration side pure water TDS value of the RO filter core is lower than the fifth preset TDS value, and the water draining time length is determined by the first two values.
Then, as shown in fig. 12, the brightness sensor detects the ambient light brightness of the water purification system, if the ambient light brightness is higher than the preset brightness during the non-water-making period after the water making is finished, the system counts the water making time, and detects the pure water TDS value at the filtering side of the RO filter element, if the counted time reaches the second set time, but the pure water TDS value at the filtering side does not reach the second preset TDS value, the three-way valve 4 is switched to the second output end thereof by taking the second set time as the first set condition, so that the pure water with high TDS value generated by permeation at the filtering side of the RO filter element 1 is discharged from the drainage branch 5; if the timing does not reach the second set time and the TDS value of the pure water at the filtration side exceeds the second preset TDS value, the three-way valve 4 is switched to the second output end thereof under the first set condition by taking the second preset TDS value, so that the pure water with high TDS value generated by permeation at the filtration side of the RO filter element 1 is discharged from the drainage branch 5.
If the ambient light brightness is lower than the preset brightness, the system counts the time for ending the water making, and detects the pure water TDS value at the filtering side of the RO filter element, if the counted time reaches the third set time, the pure water TDS value at the filtering side does not reach the third preset TDS value, and the three-way valve 4 is switched to the second output end of the three-way valve under the first set condition of the third set time, so that the pure water with high TDS value generated by permeation at the filtering side of the RO filter element 1 is discharged from the drainage branch 5; if the timing does not reach the third set time and the TDS value of the pure water at the filtration side has exceeded the third preset TDS value, the three-way valve 4 is switched to the second output end thereof under the first set condition of the third preset TDS value, so that the pure water with high TDS value generated by permeation at the filtration side of the RO filter element 1 is discharged from the drain branch 5.
In some embodiments of the present invention, the second preset TDS value may be set to be smaller than the third preset TDS value, so as to improve the quality of water when the ambient light brightness is higher than the preset brightness, i.e. the user uses water frequently, and properly reduce the quality of pure water when the ambient light brightness is lower than the preset brightness, i.e. the user does not use water frequently or not, so as to avoid the waste of water resources; here, the second preset TDS value is, for example, the minimum value of the standard pure water TDS value, and the second preset TDS value is, for example, the maximum value of the standard pure water TDS value.
The time is counted again during the pure water discharging from the water discharging branch 5, and the TDS detection means continues to detect the TDS value of the pure water on the filtration side of the RO cartridge 1, and the three-way valve 4 is closed when one of the fifth set time and the TDS value of the pure water on the filtration side is lower than the fifth preset TDS value is satisfied.
Repeating the above steps, namely, when one of the second set time and the TDS value of the pure water on the filtering side is higher than the second preset TDS value is met, or when one of the third set time and the TDS value of the pure water on the filtering side is higher than the third preset TDS value is met, switching the three-way valve again to drain water from the drainage branch, and when one of the fifth set time and the TDS value of the pure water on the filtering side is lower than the fifth preset TDS value is met, closing the three-way valve 4 until the next water production; in order to ensure that the TDS value of pure water at the filtering side of the RO filter element is always maintained in a safe pure water state during non-water making, and ensure that the first cup of water taken by a user is safe water with a low TDS value.
The preset brightness can be set in combination with time, and the preset brightness is higher for a period of time (daytime or night with illumination) when the user frequently uses water; the preset brightness is low for periods of time when the user is using little or no water (typically at night or without illumination).
It should be noted that the above description is not intended to limit the invention, but rather the invention is not limited to the above examples, and that variations, modifications, additions or substitutions within the spirit and scope of the invention will be within the scope of the invention.

Claims (3)

1. A water purification system control method, the water purification system comprising:
the RO filter element comprises a water inlet, a water outlet and a waste water port; the water inlet is connected with a water source;
the waste water pipeline is connected with a waste water port of the RO filter element;
the water tap is connected with the water outlet of the RO filter element through a water purifying pipeline;
the three-way valve comprises an input end, a first output end and a second output end, wherein the input end is connected with the water outlet of the RO filter element through a first pipeline; the first output end is connected with the water purifying pipeline;
one end of the drainage branch is connected with the second output end of the three-way valve, and the other end of the drainage branch is communicated with the waste water pipeline;
characterized in that the method comprises:
during the water production, the three-way valve is controlled to be switched to the first output end for output;
during non-water production, when a first set condition is met, the three-way valve is controlled to be switched to a second output end of the three-way valve for outputting so as to realize that pure water on the filtration side of the RO filter element is discharged through the drainage branch;
the first setting condition specifically includes:
the ambient light brightness of the water purification system is higher than the preset brightness, the water making end meets the second set time, and/or the filtration side pure water TDS value of the RO filter element exceeds the second preset TDS value;
the first setting condition further includes:
the ambient light brightness of the water purification system is lower than the preset brightness, the water production end meets a third set time, and/or the filtration side pure water TDS value of the RO filter element exceeds a third preset TDS value;
wherein the second preset TDS value is smaller than the third preset TDS value.
2. The water purification system control method according to claim 1, wherein during the discharge of pure water of the RO cartridge through the drain branch, the method further comprises:
closing the three-way valve when a second set condition is met;
the second setting condition specifically includes:
the drainage meets the fourth set time; or alternatively, the first and second heat exchangers may be,
the filtration side pure water TDS value of the RO filter core is lower than a fourth preset TDS value.
3. The water purification system control method according to claim 1, wherein during the discharge of pure water of the RO cartridge through the drain branch, the method further comprises:
closing the three-way valve when a third setting condition is met;
the third setting condition is one of the following two conditions that are satisfied first:
the drainage meets the fifth set time; or the filtration-side pure water TDS value of the RO filter core is lower than a fifth preset TDS value.
CN202010812994.2A 2020-08-13 2020-08-13 Water purification system and control method thereof Active CN114074968B (en)

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