CN109574288B

CN109574288B - Water purification system

Info

Publication number: CN109574288B
Application number: CN201710906613.5A
Authority: CN
Inventors: 桂鹏; 蔡雪刚; 赵汉旭; 谈菲
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Priority date: 2017-09-28
Filing date: 2017-09-28
Publication date: 2024-02-20
Anticipated expiration: 2037-09-28
Also published as: CN109574288A

Abstract

The invention discloses a water purification system, which comprises: the membrane filter core is provided with a raw water port connected with a raw water pipe, a pure water port connected with a pure water pipe and a waste water port connected with a waste water pipe; the water pump is arranged on the raw water pipe; the water inlet valve is arranged on a raw water pipe at the water inlet side of the water pump; the first valve body is arranged on the pure water pipe; the ion exchange filter element is arranged on the pure water pipe between the membrane filter element and the first valve body; the water inlet end of the second valve body is communicated with the pure water pipe between the ion exchange filter element and the first valve body; the water outlet end is communicated with a raw water pipe; before the water purification system starts to produce water, and when the membrane filter element meets preset flushing conditions, the water inlet valve and the first valve body are closed, the second valve body is opened, and the water pump is started to drive pure water in the membrane filter element to flow back into the membrane filter element after passing through the ion exchange filter element, so that the membrane filter element is filled with pure water. By the arrangement, the water quality of the first cup of pure water prepared by the water purification system is improved.

Description

Water purification system

Technical Field

The invention relates to the technical field of water purification, in particular to a water purification system.

Background

The drinking water problem is a very serious problem for people, and the fact that a lot of substances which are bad for health in water are not contentious is also a main reason for strengthening the consciousness of healthy drinking water, and is also a root cause of fire explosion in the market of water purifying equipment.

In the existing water purifying equipment, raw water is filtered and pure water is generated mainly by means of a membrane filter element, however, when the water purifying equipment is in a standby state, raw water, waste water and pure water are simultaneously present in the membrane filter element of the water purifying equipment, the concentration of TDS in the raw water and waste water is far higher than that of the pure water, if the water purifying equipment is in the standby state for a long time, the TDS in the raw water and waste water in the membrane filter element can be caused to permeate into the pure water of the membrane filter element, so that the TDS concentration of the first cup of pure water prepared by the water purifying equipment can be higher when the water purifying equipment is started to prepare the pure water next time, and the user experience is affected.

Disclosure of Invention

The invention mainly aims to provide a water purifying system which aims at improving the quality of first-cup pure water prepared by the water purifying system.

In order to achieve the above object, the present invention provides a water purification system, comprising:

the membrane filter core is provided with a raw water port connected with a raw water pipe, a pure water port connected with a pure water pipe and a waste water port connected with a waste water pipe;

the water pump is arranged on the raw water pipe;

the water inlet valve is arranged on a raw water pipe at the water inlet side of the water pump;

the first valve body is arranged on the pure water pipe;

the ion exchange filter element is arranged on the pure water pipe between the membrane filter element and the first valve body; the method comprises the steps of,

The water inlet end of the second valve body is communicated with the pure water pipe between the ion exchange filter element and the first valve body; the water outlet end of the water inlet pipe is communicated with the raw water pipe;

before the water purification system starts to produce water, and when the membrane filter core meets preset flushing conditions, the water inlet valve and the first valve body are closed, the second valve body is opened, and the water pump is started, so that pure water in the membrane filter core is driven to flow back into the membrane filter core after passing through the ion exchange filter core, and the membrane filter core is filled with pure water.

Preferably, the water purification system further comprises a controller, wherein the controller is electrically connected with the water pump, the water inlet valve, the first valve body and the second valve body respectively, and before the water purification system starts to produce water, and when the membrane filter core meets preset flushing conditions, the controller controls the water inlet valve and the first valve body to be closed, simultaneously controls the second valve body to be opened and controls the water pump to be opened.

Preferably, the water purifying system further comprises a first timer electrically connected with the controller, wherein the first timer is used for detecting the time interval of two adjacent power-up times before and after the water purifying system;

before the water purification system starts to produce water, and when the time interval detected by the first timer is greater than or equal to a first preset time interval, the membrane filter core meets a preset flushing condition.

Preferably, the water purifying system further comprises a third valve body and a fourth valve body which are respectively and electrically connected with the controller; the third valve body is arranged on a pure water pipe between the membrane filter element and the ion exchange filter element, the water inlet end of the fourth valve body is communicated with the pure water pipe between the membrane filter element and the third valve body, and the water outlet end of the fourth valve body is communicated with the water inlet end of the second valve body;

before the water purification system starts to produce water, and when the time interval detected by the first timer is greater than or equal to a first preset time interval, closing the water inlet valve, the first valve body and the fourth valve body, simultaneously opening the second valve body and the third valve body, and starting the water pump;

before the water purification system starts to produce water, and when the time interval detected by the first timer is smaller than a first preset time interval and is larger than or equal to a second preset time interval, the water inlet valve, the first valve body and the third valve body are closed, the second valve body and the fourth valve body are opened, and the water pump is started.

Preferably, the water purifying system further comprises a second timer electrically connected with the controller, wherein the second timer is used for detecting the standby time of the water purifying system;

Before the water purification system starts to produce water, and when the standby time detected by the second timer is longer than or equal to the first preset time, the membrane filter core meets preset flushing conditions.

Preferably, the water purifying system further comprises a third valve body and a fourth valve body which are electrically connected with the controller; the third valve body is arranged on a pure water pipe between the membrane filter element and the ion exchange filter element, the water inlet end of the fourth valve body is communicated with the pure water pipe between the membrane filter element and the third valve body, and the water outlet end of the fourth valve body is communicated with the water inlet end of the second valve body;

the water purification system further comprises a first TDS detection probe electrically connected with the controller, and the first TDS detection probe is installed in the membrane filter core to detect the TDS value of pure water in the membrane filter core;

when the standby time detected by the second timer is longer than or equal to the first preset time and the TDS value of the pure water detected by the first TDS detection probe is smaller than the first preset TDS value, closing the water inlet valve, the first valve body and the third valve body, simultaneously opening the second valve body and the fourth valve body, and starting the water pump;

When the standby time detected by the second timer is longer than or equal to the first preset time and the TDS value of the pure water detected by the first TDS detection probe is greater than or equal to the first preset TDS value, the water inlet valve, the first valve body and the fourth valve body are closed, the second valve body and the third valve body are opened, and the water pump is started.

Preferably, the water purification system further comprises a second TDS detection probe electrically connected with the controller, wherein the second TDS detection probe is installed at a pure water port of the membrane filter element or on a pure water pipe between the membrane filter element and a water inlet end of the fourth valve body so as to detect a TDS value of pure water discharged from the membrane filter element;

the controller is also used for closing the second valve body and the fourth valve body and opening the first valve body and the third valve body when the second TDS detection probe detects that the TDS value of the pure water is larger than or equal to a second preset TDS value in the water production process of the water purification system;

the controller is also used for closing the second valve body and the third valve body and opening the first valve body and the fourth valve body when the TDS value of the pure water detected by the second TDS detection probe is smaller than a second preset TDS value in the water production process of the water purification system.

Preferably, the water purifying system further comprises a third timer electrically connected with the controller, and the third timer is used for detecting the working time length of the water purifying system;

the controller is further used for closing the second valve body and the fourth valve body and opening the first valve body and the third valve body when the working time detected by the third timer is less than a second preset time in the water production process of the water purification system;

the controller is also used for closing the second valve body and the third valve body and opening the fourth valve body and the first valve body when the working time length detected by the third timer is greater than or equal to a second preset time length in the water production process of the water purification system.

Preferably, the water purifying system further comprises a flowmeter electrically connected with the controller, and the flowmeter is arranged at the pure water port of the membrane filter element so as to detect the pure water flow value passing through the pure water port;

the controller is also used for closing the second valve body and the fourth valve body and opening the first valve body and the third valve body when the pure water flow value detected by the flowmeter is smaller than a preset flow value in the water production process of the water purification system;

The controller is also used for closing the second valve body and the third valve body and opening the fourth valve body and the first valve body when the pure water flow value detected by the flowmeter is larger than or equal to a preset flow value in the water production process of the water purification system.

Preferably, the water purification system further comprises a waste water flushing valve;

before the second valve body is opened, opening the water inlet valve and the waste water flushing valve to enable raw water to flush the membrane filter element; and after the membrane filter element is washed by raw water for a preset washing time period, the water inlet valve and the waste water washing valve are closed.

Preferably, the water purification system further comprises a wastewater reflux valve, wherein the water inlet end of the wastewater reflux valve is communicated with the wastewater pipe, and the water outlet end of the wastewater reflux valve is communicated with the raw water pipe.

Preferably, the water purification system further comprises a pre-filter element, and the pre-filter element is mounted on the raw water pipe.

Preferably, the water purification system further comprises a post-filter element mounted on a pure water pipe between the membrane filter element and the ion exchange filter element.

Preferably, the water purification system further comprises a one-way valve mounted on the pure water pipe between the post-filter element and the ion exchange filter element.

According to the technical scheme, the membrane filter element of the water purifying system is respectively communicated with a raw water pipe, a pure water pipe and a waste water pipe, wherein a water pump and a water inlet valve are arranged on the raw water pipe, the water inlet valve is arranged on the raw water pipe at the water inlet side of the water pump, an ion exchange filter element and a first valve body are arranged on the pure water pipe, the ion exchange filter element is arranged on the pure water pipe between the membrane filter element and the first valve body, the water purifying system further comprises a second valve body, the water inlet end of the second valve body is communicated with the pure water pipe between the ion exchange filter element and the first valve body, and the water outlet end of the second valve body is communicated with the raw water pipe. Before the water purification system starts to produce water, and when the membrane filter core meets preset flushing conditions, closing the water inlet valve and the first valve body, opening the second valve body, and starting the water pump; at this time, the water pump can drive pure water in the membrane filter core to flow into the membrane filter core after sequentially passing through the ion exchange filter core, the second valve body and the water pump; since the ion exchange filter element can remove salt in water, the salt mixed in the pure water can be removed as much as possible when the pure water passes through the ion exchange filter element, so that the TDS concentration of the pure water flowing back into the membrane filter element can be reduced; when pure water flows back into the membrane filter element, part of raw water and part of wastewater in the membrane filter element are discharged into the wastewater pipe through the wastewater port of the membrane filter element, and the other part of raw water and the other part of wastewater form pure water under the filtration of the membrane filter element; meanwhile, one part of pure water flowing back into the membrane filter element is used for flushing the membrane filter element so as to flush away raw water and wastewater in the membrane filter element, and the other part of pure water is filtered by the membrane filter element to form pure water. The membrane filter element is filled with pure water after being circulated for a plurality of times, so that the problem that the membrane filter element is subjected to bidirectional permeation due to raw water, waste water and pure water with different concentrations in the membrane filter element is solved, and the water quality of first cup of pure water which is prepared by a water purification system every time can be guaranteed to meet the demands of users.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a water purification system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another embodiment of a water purification system according to the present invention;

FIG. 3 is a schematic view of a water purification system according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a water purification system according to another embodiment of the present invention.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

In order to improve the quality of the first-cup purified water generated by each water production of the water purification system, the present invention provides a water purification system, and referring to fig. 1, fig. 1 shows a schematic structure diagram of an embodiment of the water purification system of the present invention.

The water purification system 100 includes:

a membrane cartridge 10 having a raw water port connected to a raw water pipe a, a pure water port connected to a pure water pipe b, and a waste water port connected to a waste water pipe c;

a water pump 15 mounted on the raw water pipe a;

a water inlet valve 20 mounted on a raw water pipe a of the water pump 15 on a water inlet side;

a first valve body 25 mounted on the pure water pipe b;

an ion exchange cartridge 30 mounted on the pure water pipe b between the membrane cartridge 10 and the first valve body 25; the method comprises the steps of,

a second valve body 35 having a water inlet end communicating with the pure water pipe b between the ion exchange cartridge 30 and the first valve body 25; the water outlet end of the water outlet pipe is communicated with the raw water pipe a.

Specifically, the membrane filter element 10 has a raw water port, a pure water port and a waste water port; the raw water pipe a can be a tap water pipe or a water pipe communicated with other water sources; the pure water port is communicated with the pure water pipe b, so that pure water generated by filtering by the membrane filter core 10 can be discharged through the pure water pipe b; the waste water gap is communicated with the waste water pipe c, so that the waste water generated by filtering the membrane filter core 10 can be intensively discharged through the waste water pipe c, the water outlet end of the waste water pipe c can be communicated with the waste water tank, the waste water can be conveniently collected, the waste water collected in the waste water tank can be used as other waste water, and the waste of water resources is avoided.

The water pump 15 is installed on the raw water pipe a, and is mainly used for pressurizing raw water in the raw water pipe a, so that the water pressure of raw water entering the membrane filter element 10 through the raw water pipe a is ensured to be high enough, and the water making speed of the membrane filter element 10 is improved. Preferably, the water pump 15 is a variable frequency water pump 15, and since the rotation speed of the variable frequency water pump 15 is adjustable, the water making speed of the membrane filter core 10 can be adjusted, that is, the user can adjust the rotation speed of the variable frequency water pump 15 according to the requirement. When the rotation speed of the variable-frequency water pump 15 is higher, the amount of raw water passing through the variable-frequency water pump 15 in the same time period is more, so that the amount of raw water passing through the membrane filter element 10 in the same time period is increased, and the water making speed of the membrane filter element 10 is improved; when the rotation speed of the variable frequency water pump 15 is low, the amount of raw water passing through the variable frequency water pump 15 in the same time period is small, so that the amount of raw water passing through the membrane filter element 10 in the same time period is small, the water making speed of the membrane filter element 10 is slowed down, but raw water passing through the membrane filter element 10 can be sufficiently filtered, and the use rate of raw water is improved.

The ion exchange resin filter core mainly aims at removing salt substances (namely various anions and cations) in water, when the water passes through the ion exchange resin filter core, cations in the water are combined with anions in the ion exchange resin filter core to generate H ions, meanwhile, anions in the water are combined with cations in the ion exchange resin filter core to generate OH ions, and the H ions and the OH ions are combined with each other after being generated to form HO, so that when pure water passes through the ion exchange resin filter core, the TDS of the pure water can be greatly reduced, and the requirements of users can be met.

The water inlet valve 20, the first valve body 25 and the second valve body 35 are all used for controlling the on-off of the pipeline where the water inlet valve 20, the first valve body 25 and the second valve body 35 are located, and may be manual valves or electric valves, and the water inlet valve 20, the first valve body 25 and the second valve body 35 are not particularly limited herein.

Before the water purification system 100 starts to produce water, and when the membrane filter cartridge 10 meets a preset flushing condition, the water inlet valve 20 and the first valve body 25 are closed, the second valve body 35 is opened, and the water pump 15 is started; at this time, the whole water purification system 100 is only smooth in the water path formed by the water pump 15, the membrane filter 10, the ion exchange filter 30 and the second valve 35, that is, when the pure water in the membrane filter 10 passes through the ion exchange filter 30, the second valve 35, the water pump 15 and the raw water pipe a between the membrane filter 10 and the water pump 15 flows into the membrane filter 10 to flush the membrane filter 10, while the water purification system 100 is in a standby state, bi-directional permeation occurs in the membrane filter 10 to increase the concentration of pure water in the membrane filter 10, but when the pure water in the membrane filter 10 passes through the ion exchange filter 30, cations in the pure water are combined with anions in the ion exchange filter 30 and H ions are generated, anions in the pure water are combined with cations in the ion exchange filter 30 and OH ions are also generated, and the H ions and OH ions are combined with each other to form, so that when the pure water passes through the ion exchange filter 30, the pure water in the membrane filter 10 is removed, and even all the pure water in the membrane filter 30 is removed; when the pure water passing through the ion exchange filter element 30 flows back into the membrane filter element 10, a part of raw water and a part of waste water in the membrane filter element 10 are discharged into the waste water pipe c through a waste water port of the membrane filter element 10, and the other part of the waste water forms pure water under the filtration of the membrane filter element 10; meanwhile, a part of the pure water flowing back into the membrane filter element 10 is used for flushing the membrane filter element 10 so as to flush away the raw water and the wastewater in the membrane filter element 10, and the other part of the pure water is filtered by the membrane filter element 10 to form pure water. The circulation is repeated for a plurality of times, so that the membrane filter core 10 is filled with pure water, and the problem that the membrane filter core 10 is subjected to bidirectional permeation due to the raw water, the waste water and the pure water with different concentrations in the membrane filter core 10 is solved, thereby ensuring that the water quality of the first cup of pure water which is prepared by the water purification system 100 each time can meet the demands of users.

It should be noted that the preset flushing condition of the membrane filter 10 may be a standby time of the water purification system 100, a water quality of a region where the water purification system 100 is used, a time interval between two water producing processes of the water purification system 100, etc., which are not specifically described herein, and a user may control the water purification system 100 according to these conditions to flush the membrane filter 10 of the water purification system 100.

According to the technical scheme of the invention, the membrane filter element 10 of the water purification system 100 is respectively communicated with a raw water pipe a, a pure water pipe b and a waste water pipe c, wherein the raw water pipe a is provided with a water pump 15 and a water inlet valve 20, the water inlet valve 20 is arranged on the raw water pipe a at the water inlet side of the water pump 15, the pure water pipe b is provided with an ion exchange filter element 30 and a first valve body 25, the ion exchange filter element 30 is arranged on the pure water pipe b between the membrane filter element 10 and the first valve body 25, the water purification system 100 further comprises a second valve body 35, the water inlet end of the second valve body 35 is communicated with the pure water pipe b between the ion exchange filter element 30 and the first valve body 25, and the water outlet end of the second valve body 35 is communicated with the raw water pipe a. Before the water purification system 100 starts to produce water, and when the membrane filter cartridge 10 meets a preset flushing condition, the water inlet valve 20 and the first valve body 25 are closed, the second valve body 35 is opened, and the water pump 15 is started; at this time, the water pump 15 may drive the pure water inside the membrane filter 10 to flow into the membrane filter 10 after sequentially passing through the ion exchange filter 30, the second valve 35, and the water pump 15; since the ion exchange cartridge 30 can remove salt in water, it allows the salt mixed in pure water to be removed as much as possible when pure water passes through the ion exchange cartridge 30, so that the concentration of pure water flowing back into the membrane cartridge 10 can be reduced; when pure water flows back into the membrane filter element 10, part of raw water and part of waste water in the membrane filter element 10 are discharged into the waste water pipe c through the waste water port of the membrane filter element 10, and the other part of raw water and the other part of waste water form pure water under the filtration of the membrane filter element 10; meanwhile, a part of the pure water flowing back into the membrane filter element 10 is used for flushing the membrane filter element 10 so as to flush away the raw water and the wastewater in the membrane filter element 10, and the other part of the pure water is filtered by the membrane filter element 10 to form pure water. The membrane filter core 10 is filled with pure water after the circulation for a plurality of times, so that the problem that the membrane filter core 10 is subjected to bi-directional permeation due to raw water, waste water and pure water with different concentrations in the membrane filter core 10 is solved, and the water quality of the first cup of pure water which is prepared by the water purification system 100 each time can be ensured to meet the demands of users.

In addition, the membrane filter core 10 is washed by pure water, impurities attached to the reverse osmosis membrane sheet inside the membrane filter core 10 can be washed away, and therefore the phenomenon that the reverse osmosis membrane sheet inside the membrane filter core 10 is blocked due to the fact that the impurities are blocked on the reverse osmosis membrane sheet inside the membrane filter core 10 is avoided, and further the service life of the membrane filter core 10 is prolonged.

The water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35 may be opened or closed manually; the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35 can be opened or closed by a controller; of course, one or more of the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35 may be opened or closed manually, and the other may be opened or closed by a controller. Here, the manner in which the water pump 15, the water inlet valve 20, the first valve body 25, and the second valve body 35 are opened or closed is not particularly limited.

In one embodiment of the present invention, the water pump 15, the water inlet valve 20, the first valve body 25, and the second valve body 35 are all opened or closed by a controller. Specifically, the water purification system 100 further includes a controller, which may be a single-chip microcomputer or a PWM controller. The controller is electrically connected to the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35, that is, the controller is electrically connected to the control circuits of the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35, so as to control the opening or closing of the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35.

Specifically, before the water purification system 100 starts to produce water, and when the membrane filter core 10 meets a preset flushing condition, the controller triggers the control circuits of the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35 to control the water inlet valve 20 and the first valve body 25 to be closed, simultaneously controls the second valve body 35 to be opened, and controls the water pump 15 to be opened, so that pure water in the membrane filter core 10 flows back into the membrane filter core 10 after sequentially passing through the ion exchange filter core 30, the second valve body 35 and the water pump 15 under the driving of the water pump 15, so as to flush the membrane filter core 10.

In an embodiment of the present invention, the preset flushing condition of the membrane filter cartridge 10 is a time interval between two adjacent power-up processes before and after the water purification system 100. The water inlet valve 20 and the first valve body 25 are powered on and opened when the water purification system 100 is used for preparing water, and the water inlet valve 20 and the first valve body 25 are powered off and closed when the water purification system 100 is in standby, that is, the time interval between two adjacent power-on times before and after the water purification system 100 can be determined by detecting the time interval between two adjacent power-on times before and after one of the water inlet valve 20 or the first valve body 25. In order to facilitate detection of the time interval between two adjacent power-up processes of the water purification system 100, the water purification system 100 further includes a first timer (not shown), and the controller is electrically connected to the first timer and controls the operation of the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35 according to the detection result of the first timer.

Specifically, before the water purification system 100 starts to produce water, and when the first timer detects that the time interval between the power-up of the water purification system 100 and the power-up of the water purification system 100 is greater than or equal to the first preset time interval, the membrane filter 10 meets a preset flushing condition, at this time, the controller controls the water inlet valve 20 and the first valve body 25 to be closed, simultaneously controls the second valve body 35 to be opened, and controls the water pump 15 to be opened, so as to flush the membrane filter 10, so that the membrane filter 10 is filled with raw water. Thus, the water quality of the first cup of pure water prepared when the water purification system 100 is started to prepare water next time can be ensured to meet the requirements of users; and the flushing of the membrane cartridge 10 is entirely controlled by the controller and the first timer, so that a user operation is not required, thereby facilitating the use of the water purification system 100 by a user.

It should be noted that, after the water purification system 100 is powered on, water preparation is not performed immediately, and a water preparation instruction is usually input or corresponding components are manually started to perform water preparation, that is, after the water purification system 100 is powered on, there is an idle time, and when the first timer detects that the time interval between two adjacent power-on steps before and after the water inlet valve 20 is greater than or equal to a preset time interval, the controller triggers the control circuits of the water pump 15, the water inlet valve 20, the first valve body 25 and the second valve body 35 to control the water inlet valve 20 and the first valve body 25 to be closed, simultaneously control the second valve body 35 to be opened, and control the water pump 15 to be opened to flush the membrane filter core 10. By the arrangement, on one hand, the raw water and the high-concentration wastewater in the membrane filter element 10 are replaced by pure water, and further, the water quality of the first cup of pure water prepared by opening the membrane filter element 10 each time can meet the requirements of users; on the other hand, the idle time of the water purification system 100 is fully utilized, so that the flushing process of the membrane filter element 10 is performed under the condition that a user does not find the flushing process, and the influence of the flushing process of the membrane filter element 10 on the water production process of the water purification system 100 is avoided.

Further, the water purifying system 100 further includes a third valve body 40 and a fourth valve body 45 electrically connected to the controller, respectively; the third valve body 40 is mounted on the pure water pipe b between the membrane filter core 10 and the ion exchange filter core 30, the water inlet end of the fourth valve body 45 is communicated with the pure water pipe b between the membrane filter core 10 and the third valve body 40, and the water outlet end of the fourth valve body 45 is communicated with the water inlet end of the second valve body 35. By the arrangement, pure water can flow back to the membrane filter core 10 through the ion exchange filter core 30 or the fourth valve body 45, so that the ion exchange filter core 30 is prevented from being in a working state all the time, and the service life of the ion exchange filter core 30 is prolonged.

In order to control the backflow waterway of the pure water into the membrane filter cartridge 10 conveniently, the controller also controls the opening or closing of the water inlet valve 20, the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 according to the detection result of the first timing.

Specifically, when the time interval detected by the first timer is greater than or equal to a first preset time interval, the controller triggers the control circuits of the water inlet valve 20, the first valve body 25, the second valve body 35, the third valve body 40, the fourth valve body 45 and the water pump 15 to control the water inlet valve 20, the first valve body 25 and the fourth valve body 45 to be closed, simultaneously control the second valve body 35 and the third valve body 40 to be opened and control the water pump 15 to be opened. It should be noted that, if the downtime of the water purifying system 100 is greater than the first preset time interval, bi-directional permeation of raw water, waste water and pure water in the membrane filter core 10 occurs, that is, the concentration of pure water in the membrane filter core 10 increases, and if the membrane filter core 10 is rinsed with pure water having a higher concentration, multiple rinsing of the membrane filter core 10 is required, so that the rinsing duration of the membrane filter core 10 is prolonged, and the normal use of the water purifying system 100 by a user is affected. The first valve body 25 and the fourth valve body 45 are closed, so that pure water can only flow back into the membrane filter core 10 after passing through the ion exchange filter core 30, salt ions contained in the pure water can be removed by the ion exchange filter core 30 when the pure water passes through the ion exchange filter core 30, and therefore the quality of the pure water flowing back into the membrane filter core 10 is better, and the pure water flowing back into the membrane filter core 10 can be circulated for several times, so that the membrane filter core 10 is filled with the pure water with compound requirements, and the washing time of the membrane filter core 10 is shortened.

When the time interval detected by the first timer is smaller than the first preset time interval and is greater than or equal to the second preset time interval, at this time, since the standby time of the water purification system 100 is relatively short, in the shorter time interval, less ions permeate into the pure water of the membrane filter 10 and even the raw water, the waste water and the pure water in the membrane filter 10 cannot permeate in both directions, so that the pure water in the membrane filter 10 can be directly used to flush the membrane filter 10, that is, the controller triggers the control circuits of the water inlet valve 20, the first valve 25, the second valve 35, the third valve 40, the fourth valve 45 and the water pump 15, so as to control the water inlet valve 20, the first valve 25 and the third valve 40 to be closed, and simultaneously control the second valve 35 and the fourth valve 45 to be opened and control the water pump 15 to be opened. By the arrangement, the membrane filter core 10 can be quickly washed, and meanwhile, the ion exchange filter core 30 can be prevented from being always in a working state when the membrane filter core 10 is washed, so that the service life of the membrane filter core 10 is effectively prolonged.

It should be noted that, when the first timer detects that the time interval between two adjacent power-up processes before and after the water inlet valve 20 is smaller than the second preset time interval, that is, the time interval between two adjacent water-making processes before and after the water purifying system 100 is relatively short, raw water, waste water and pure water in the membrane filter core 10 cannot bi-directionally permeate, and at this time, the controller controls the water pump 15, the water inlet valve 20, the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 to be kept in the closed state, so that the water resource waste is reduced.

In an embodiment of the present invention, the preset flushing condition of the membrane filter cartridge 10 is a standby period of the water purification system 100. It should be noted that, the standby time period of the membrane filter core 10 is a time period when the membrane filter core 10 stops producing water, in the whole water purification system 100, the water inlet valve 20 and the first valve body 25 are both in an open state when the water purification system 100 produces water, and are both in a closed state when the water purification system 100 stops producing water, that is, the standby time period of the water purification system 100 may be determined by detecting the closing time period of one of the water inlet valve 20 and the first valve body 25. The following description will be made specifically taking as an example the detection of the closing time period of the water inlet valve 20.

In order to facilitate detection of the closing duration of the water inlet valve 20, the water purification system 100 further includes a second timer electrically connected to the controller, where the second timer is used to detect the closing duration of the water inlet valve 20, and the controller triggers the opening or closing of the water inlet valve 20, the first valve body 25, the second valve body 35, the third valve body 40, the fourth valve body 45, and the water pump 15 according to the detection result of the second timer.

Specifically, when the second timer detects that the closing time of the water inlet valve 20 reaches the first preset time, the controller triggers the control circuits of the water inlet valve 20, the first valve body 25, the second valve body 35 and the water pump 15 to control the water inlet valve 20 and the first valve body 25 to be closed, simultaneously controls the second valve body 35 to be opened and controls the water pump 15 to be opened, so as to drive pure water in the membrane filter core 10 to flow back into the membrane filter core 10 after passing through the ion exchange filter core 30, and wash the membrane filter core 10, so that the membrane filter core 10 is filled with the pure water. Thus, the water quality of the first cup of pure water prepared when the water purification system 100 is started to prepare water next time can be ensured to meet the requirements of users; and the flushing of the membrane cartridge 10 is entirely controlled by the controller and the second timer, so that a user operation is not required, thereby facilitating the use of the water purification system 100 by the user.

It should be noted that, after the membrane filter core 10 is rinsed once, since the inside of the membrane filter core 10 is filled with pure water, bi-directional permeation does not occur in the membrane filter core 10, so that the second timer may stop working after detecting that the standby time of the water purification system 100 reaches the preset time and sending the detected electric signal to the controller, and the second timer may be started again when the water purification system 100 finishes the next water preparation.

In addition, it should be noted that, the first preset duration may be set according to the water quality of the water purification system 100 in the use area, and if the water quality of the water purification system 100 in the use area is relatively good, the first preset duration may be set relatively long, so that the problem that the membrane filter element 10 needs to be washed each time the water purification system 100 is in the standby state is avoided; if the water quality of the water purification system 100 is relatively poor, the first preset time period can be set relatively short, so that on one hand, the water quality of the first cup of pure water which is prepared by the water purification system 100 each time can be ensured, and meanwhile, raw water and waste water in the membrane filter element 10 can be washed away, so that impurities and dirt in the waste water are prevented from accumulating in the membrane filter element 10, and the problem that the membrane filter element 10 is blocked is solved, and the service life of the membrane filter element 10 is prolonged.

In order to conveniently control the backflow waterway of the pure water into the membrane filter core 10, the water purifying system 100 further comprises a first TDS detection probe (not shown) electrically connected with the controller, wherein the first TDS detection probe is installed in the membrane filter core 10 to detect the TDS value of the pure water in the membrane filter core 10. The controller controls the opening or closing of the water inlet valve 20, the first valve body 25, the second valve body 35, the third valve body 40, and the fourth valve body 45 according to the detection results of the second timer and the first TDS detection probe.

Specifically, the standby time detected by the second timer is longer than or equal to the first preset time, and when the first TDS detection probe detects that the TDS value of the pure water in the membrane filter core 10 is greater than or equal to the first preset TDS value, that is, bi-directional osmosis occurs between the raw water, the waste water and the pure water in the membrane filter core 10, the concentration of the pure water in the membrane filter core 10 is relatively high, if the membrane filter core 10 is rinsed with the pure water with relatively high concentration, the membrane filter core 10 needs to be rinsed for multiple times, so that the rinsing time of the membrane filter core 10 is prolonged, and the normal use of the pure water by the user can be affected. The water inlet valve 20, the first valve body 25 and the fourth valve body 45 are closed, and the second valve body 35 and the third valve body 40 are opened, so that pure water in the membrane filter core 10 can only flow back into the membrane filter core 10 through the ion exchange filter core 30, and salt ions in the pure water can be removed by the ion exchange filter core 30 when the pure water passes through the ion exchange filter core 30, so that the quality of the pure water flowing back into the membrane filter core 10 is better, and the pure water flowing back into the membrane filter core 10 can be filled with the pure water with compound requirements for several times, thereby shortening the flushing time of the membrane filter core 10.

When the standby time detected by the second timer is longer than or equal to the first preset time, and when the first TDS detection probe detects that the TDS value of the pure water in the membrane filter cartridge 10 is smaller than the first preset TDS value, that is, only less salt ions in the raw water and the waste water in the membrane filter cartridge 10 permeate into the pure water in the membrane filter cartridge 10, and even no bi-directional permeation occurs between the raw water, the waste water and the pure water in the membrane filter cartridge 10, the pure water in the membrane filter cartridge 10 can be directly used for flushing the membrane filter cartridge 10, that is, the controller triggers the control circuits of the water inlet valve 20, the first valve body 25, the second valve body 35, the third valve body 40, the fourth valve body 45 and the water pump 15, so as to control the water inlet valve 20, the first valve body 25 and the third valve body 40 to be closed, and simultaneously control the second valve body 35 and the fourth valve body 45 to be opened, and control the water pump 15 to be opened. By the arrangement, the membrane filter core 10 can be quickly washed, and meanwhile, the ion exchange filter core 30 can be prevented from being always in a working state when the membrane filter core 10 is washed, so that the service life of the membrane filter core 10 is effectively prolonged.

Based on the above embodiments, it should be noted that, if the power-up time of the water purification system 100 is relatively short, or the standby time of the water purification system 100 is relatively short, the water purification system 100 will not flush the membrane filter cartridge 10, but the water quality of the first cup of pure water produced by the water purification system 100 will be affected if bi-directional permeation occurs between the raw water, the waste water and the pure water in the membrane filter cartridge 10 during the time period when the water purification system 100 is in the standby state, and in view of this problem, in an embodiment of the present invention, please refer to fig. 2, the water purification system 100 further includes a second TDS detection probe 50 electrically connected to the controller, wherein the second TDS detection probe 50 is installed at the pure water port of the membrane filter cartridge 10 or on the pure water pipe b between the water inlet end of the membrane filter cartridge 10 and the fourth valve 45 to detect the TDS value of the pure water discharged from the membrane filter cartridge 10. The controller controls the opening or closing of the first, second, third and fourth valve bodies 25, 35, 40, 45 according to the detection result of the second TDS detection probe 50.

When the water purification system 100 is in the process of producing water, the water inlet valve 20 and the water pump 15 are both in an open state, so that the continuous inflow of raw water into the membrane filter cartridge 10 for filtration is ensured, and pure water is formed to flow into the pure water pipe b from the pure water port of the membrane filter cartridge 10. When the pure water passes through the pure water port of the membrane filter cartridge 10 or the pure water pipe b between the water inlet ends of the membrane filter cartridge 10 and the fourth valve body 45, the second TDS detection probe 50 detects the TDS value of the pure water, and if the second TDS detection probe 50 detects that the TDS value of the pure water is greater than or equal to the second preset TDS value, the controller triggers the control circuits of the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 to control the second valve body 35 and the fourth valve body to close, and control the first valve body 25 and the third valve body 40 to open, and at this time, the pure water with higher concentration passes through the ion exchange filter cartridge 30 and then is discharged through the first valve body 25. Because the salt ions contained in the purified water can be removed by the ion exchange filter element 30 as much as possible when the purified water passes through the ion exchange filter element 30, the concentration of the purified water passing through the ion exchange filter element 30 can be reduced to be in the range meeting the requirements of users, and the first cup of purified water which is prepared by the water purification system 100 every time can be ensured to meet the requirements of users. If the TDS value of the pure water detected by the second TDS detection probe 50 is smaller than the second preset TDS value, it is indicated that the quality of the pure water discharged from the membrane filter cartridge 10 is better, and at this time, the controller triggers the control circuits of the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 to control the second valve body 35 and the third valve body 40 and control the first valve body 25 and the fourth valve body to be opened. Thus, the ion exchange filter element 30 is prevented from being always in a working state when the water purifying system 100 is in a water producing state, and the service life of the ion exchange filter element 30 can be effectively prolonged.

The difference between the first TDS detection probe and the second TDS detection probe 50 is that the first TDS detection probe operates when the water purification system 100 is in a standby state, and the second TDS detection probe 50 operates during the water purification and washing process, and the two do not affect each other. In addition, in view of the cost, the water purifying system 100 may only be provided with one TDS detection probe, and only a corresponding control circuit is required to control the TDS detection probe.

Obviously, the second TDS detection probe 50 in the above embodiment may be replaced with a third timer (not shown). Specifically, the third timer is configured to detect a working time of the water purification system 100. It should be noted that, the working time of the membrane filter core 10 is the water making time of the membrane filter core 10, in the whole water purifying system 100, the water inlet valve 20 and the first valve body 25 are both in an open state when the water purifying system 100 makes water, and are both in a closed state when the water purifying system 100 stops making water, that is, the working time of the water purifying system 100 can be determined by detecting one of the water inlet valve 20 and the first valve body 25. The controller controls the first, second, third and fourth valve bodies 25, 35, 40 and 45 to be opened or closed according to the detection result of the third timer.

Specifically, in the water production process of the water purification system 100, and when the working time detected by the third timer is less than the second preset time, that is, the water purification system 100 is just boiled for a short time, the pure water with higher concentration is discharged from the membrane filter core 10, and in order to ensure that the pure water discharged from the water purification system 100 can meet the requirement of the user, the pure water with higher concentration needs to be desalted. After receiving the detection electric signal of the third timer, the controller triggers the control circuits of the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 to control the second valve body 35 and the fourth valve body 45 to be closed and control the first valve body 25 and the third valve body 40 to be opened, so that pure water discharged from the membrane filter core 10 passes through the ion exchange filter core 30 and is supplied to a user, and as salt ions contained in the pure water are removed by the ion exchange filter core 30 as much as possible when the pure water passes through the ion exchange filter core 30, the concentration of the pure water passing through the ion exchange filter core 30 is reduced to a range meeting the requirements of the user, and the first cup of pure water which is manufactured by the water purification system 100 each time is ensured to meet the requirements of the user.

In the water production process of the water purification system 100, and when the working time detected by the third timer is longer than the second preset time, at this time, pure water with higher concentration inside the membrane filter core 10 is discharged, and the concentration of the newly prepared pure water meets the user requirement, after receiving the detection electric signal of the third timer, the controller triggers the control circuits of the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 to control the second valve body 35 and the third valve body 40 to be closed and control the first valve body 25 and the fourth valve body 45 to be opened, so that the ion exchange filter core 30 is prevented from being always in the working state when the water purification system 100 is in the water production state, and the service life of the ion exchange filter core 30 can be effectively prolonged.

Furthermore, the second TDS detection probe 50 in the above embodiment may be replaced with a flow meter 55. Specifically, referring to fig. 3, the flow meter 55 is mounted on the pure water port of the membrane filter element 10 or the flow meter 55 is mounted on the pure water pipe b between the water inlet ends of the membrane filter element 10 and the fourth valve body 45, and is used for detecting the pure water amount produced by the water purification system 100. The controller is electrically connected to the flow meter 55, and controls the first, second, third and fourth valve bodies 25, 35, 40 and 45 to be opened or closed according to the detection result of the flow meter 55.

Specifically, in the water production process of the water purification system 100, and when the flow meter 55 detects that the amount of pure water produced by the water purification system 100 is smaller than the preset amount of pure water, that is, the water purification system 100 is just boiled for a short time, the pure water with higher concentration is discharged from the membrane filter core 10, and in order to ensure that the pure water discharged from the water purification system 100 can meet the requirements of users, the pure water with higher concentration needs to be desalted. After receiving the detection electric signal of the flow meter 55, the controller triggers the control circuits of the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 to control the second valve body 35 and the fourth valve body 45 to be closed and control the first valve body 25 and the third valve body 40 to be opened, so that pure water discharged from the membrane filter core 10 passes through the ion exchange filter core 30 and is supplied to a user, and as salt ions contained in the pure water are removed by the ion exchange filter core 30 as much as possible when the pure water passes through the ion exchange filter core 30, the concentration of the pure water passing through the ion exchange filter core 30 is reduced to a range meeting the user requirement, and the first cup of pure water prepared by the water purification system 100 each time can meet the user requirement.

In the water production process of the water purification system 100, and when the flow meter 55 detects that the pure water produced by the water inlet system is equal to or greater than the preset pure water amount, that is, when the pure water with higher concentration inside the membrane filter core 10 is discharged, the concentration of the newly produced pure water meets the user requirement, the controller triggers the control circuits of the first valve body 25, the second valve body 35, the third valve body 40 and the fourth valve body 45 after receiving the detection electric signal of the flow meter 55, so as to control the second valve body 35 and the third valve body 40 to be closed, and control the first valve body 25 and the fourth valve body 45 to be opened, thereby avoiding that the ion exchange filter core 30 is always in a working state when the water purification system 100 is in a water production state, and further effectively prolonging the service life of the ion exchange filter core 30.

In an embodiment of the present invention, referring to fig. 1, 2 or 3, the water purification system 100 further includes a waste water flushing valve 65, the waste water flushing valve 65 is used for controlling on/off of the waste water pipe c, and the waste water flushing valve 65 may be a manual valve or an electromagnetic valve electrically connected to the controller. Preferably, the waste water flushing valve 65 is a solenoid valve, so that the opening or closing of the waste water flushing valve 65 can be controlled by the controller.

Before the water purification system 100 is in a standby state and before the second valve body 35 is opened, that is, before pure water in the membrane filter element 10 flows back into the membrane filter element 10 to flush the membrane filter element 10, the water inlet valve 20 and the waste water flushing valve 65 are opened, so that raw water in the raw water pipe a can enter the membrane filter element 10 and initially flush the membrane filter element 10, at this time, raw water and waste water in the membrane filter element 10 are both replaced under the flushing of raw water, and impurities and dirt remained in the membrane filter element 10 are flushed out together, so that the membrane filter element 10 is initially cleaned. And, after the membrane filter cartridge 10 is rinsed with raw water for a preset rinsing period, the water inlet electromagnetic valve and the wastewater rinsing valve 65 are closed. That is, the subsequent flushing of the membrane cartridge 10 is performed by the pure water inside the membrane cartridge 10 flowing back into the membrane cartridge 10. By the arrangement, on one hand, the membrane filter element 10 can be prevented from being blocked by impurities and dirt, and further the service life of the membrane filter element 10 can be prolonged; on the other hand, the membrane filter element 10 is primarily rinsed by raw water, so that when the membrane filter element 10 is rinsed by the subsequent pure water, the raw water and the pure water in the membrane filter element 10 are replaced, that is, when the membrane filter element 10 is rinsed by the pure water, impurities and dirt in the membrane filter element 10 are removed, and therefore, the frequency of rinsing the membrane filter element 10 by the pure water is reduced, and the rinsing time of the membrane filter element 10 is shortened; in addition, the waste water flushing valve 65 is closed, so that pure water flowing back into the membrane filter cartridge 10 can be prevented from being discharged through the waste water pipe c, and waste of water resources is saved.

In an embodiment of the present invention, referring to fig. 4, the water purification system 100 further includes a waste water return valve 70, a water inlet end of the waste water return valve 70 is connected to the waste water pipe c, and a water outlet end of the waste water return valve 70 is connected to the raw water pipe a. The waste water return valve 70 may be a manual valve or a solenoid valve, and preferably the waste water return valve 70 is a solenoid valve electrically connected to the controller.

When the waste water return valve 70 is opened, the waste water pipe c can be communicated with the raw water pipe a through the waste water return valve 70, and at this time, part of waste water in the waste water pipe c can be returned into the raw water pipe a through the waste water return valve 70 and flows into the membrane filter cartridge 10 again through the raw water pipe a for filtration.

Further, the opening degree of the wastewater reflux valve 70 is set to be adjustable, when the water purification system 100 is used in a region with better water quality, the opening degree of the wastewater reflux valve 70 can be increased, so that most of wastewater generated by filtering the membrane filter element 10 can be refluxed into the raw water pipe a through the wastewater reflux valve 70 and enter the membrane filter element 10 again for filtering; when the water purification system 100 is used in a region with poor water quality, the opening of the waste water flushing valve 65 can be reduced, so that waste water with more impurities can be reduced from flowing back into the membrane filter element 10, and the filtration can be performed again, thereby preventing the membrane filter element 10 from being blocked. The arrangement of the waste water reflux valve 70 greatly reduces the waste water discharge amount of the water purification system 100, which is beneficial to improving the water production rate of the water purification system 100 and reducing the waste of water resources.

The waste water return valve 70 is closed when the membrane filter element 10 is flushed, so that the problem that waste water flushing the membrane filter element 10 is returned to the membrane filter element 10 again is avoided. Of course, a valve body may be disposed on the waste water pipe c between the membrane filter core 10 and the water inlet end of the waste water return valve 70 to control the on-off of the waste water pipe c, so that when the membrane filter core 10 is flushed, the waste water pipe c and the waste water electromagnetic valve 70 can be cut off simultaneously only by closing the valve body.

In one embodiment of the present invention, the water purification system 100 further includes a pre-filter 75, and the pre-filter 75 is mounted on the raw water pipe a. The pre-filter 75 may be a PP cotton filter, an activated carbon filter, or other filter with pure water function, which is not particularly limited herein. The front filter element 75 is arranged in front of the raw water pipe a, so that large particle impurities in raw water can be effectively filtered, and the problem that the membrane filter element 10 is blocked due to the fact that the particle impurities in the raw water are attached to the inside of the membrane filter element 10 is avoided. Preferably, the pre-filter 75 is a composite filter, and the composite filter comprises three layers of non-woven fabrics, carbon fibers and PP cotton, that is, the composite filter integrates the functions of the carbon fiber filter and the PP cotton filter, that is, one filter can replace two filters, so that the number of pre-filter 75 is reduced, and the installation space required by the whole water purification system 100 is smaller.

In one embodiment of the present invention, the water purification system 100 further includes a post-filter cartridge 80, and the post-filter cartridge 80 is mounted on the pure water pipe b between the membrane cartridge 10 and the ion exchange cartridge 30. The rear filter element 80 can be an activated carbon filter element, and the activated carbon filter element mainly uses activated carbon as a main raw material, so that residual chlorine, peculiar smell and the like in water can be removed, and meanwhile, the taste of the water can be improved, so that the user experience can be improved.

Further, the water purification system 100 further includes a check valve 85, and the check valve 85 is installed on the pure water pipe b between the post-filter 80 and the ion exchange filter 30. By this arrangement, the problem that the pure water in the rear filter element 80 flows back to the membrane filter element 10 when the water purifying system 100 is in the standby state is avoided.

In an embodiment of the present invention, the water purifying system 100 further includes a pressure detecting device, preferably a high-pressure switch 90, the high-pressure switch 90 is installed on the pure water pipe b on the water outlet side of the first valve body 25, and the high-pressure switch 90 is further electrically connected to the controller, and the controller further controls the opening or closing of the water inlet valve 20, the water pump 15, the first valve body 25 and the second valve body 35 according to the detection result of the high-pressure switch 90.

Specifically, when the water outlet end of the pure water pipe b is opened, since pure water flows to the water outlet end, the pressure at the high-pressure switch 90 is reduced, which indicates that the user needs water, and at this time, the controller triggers the control circuits of the water inlet valve 20, the water pump 15, the first valve body 25 and the second valve body 35 according to the detection electric signal of the high-pressure switch 90, so as to control the second valve body 35 to be closed, simultaneously control the water inlet valve 20 and the first valve body 25 to be opened, and control the water pump 15 to be opened, so that external raw water can enter the membrane filter core 10 through the raw water pipe a, and the pure water is filtered by the membrane filter core 10 to be discharged from the pure water pipe b for the user to take. When the water outlet end of the pure water pipe b is closed, pure water in the membrane filter core 10 continuously flows to the water outlet end of the pure water pipe b until the pure water pipe b is filled, so that the pressure in the pure water pipe b is increased, and when the high-pressure switch 90 detects that the pressure in the pure water pipe b is increased to a preset water pressure value, the controller triggers the control circuits of the water inlet valve 20, the water pump 15, the first valve body 25 and the second valve body 35 according to the detection electric signal of the high-pressure switch 90, so as to control the water inlet valve 20, the water pump 15, the first valve body 25 and the second valve to be closed. By the arrangement, the opening and closing of the water purifying system 100 are intelligently controlled, and the water purifying system is convenient for a user to use.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. A water purification system, comprising:

the water pump is arranged on the raw water pipe; the water pump is a variable-frequency water pump;

the first valve body is arranged on the pure water pipe;

before the water purification system starts to produce water, and when the membrane filter core meets preset flushing conditions, the water inlet valve and the first valve body are closed, the second valve body is opened, and the water pump is started to drive pure water in the membrane filter core to flow back into the membrane filter core after passing through the ion exchange filter core, so that the membrane filter core is filled with pure water;

The water purification system further comprises a controller, wherein the controller is electrically connected with the water pump, the water inlet valve, the first valve body and the second valve body respectively, and before the water purification system starts to produce water, and when the membrane filter element meets the preset flushing condition, the controller controls the water inlet valve and the first valve body to be closed, simultaneously controls the second valve body to be opened and controls the water pump to be opened;

the water purification system further comprises a first timer electrically connected with the controller, wherein the first timer is used for detecting the time interval of two adjacent power-up times before and after the water purification system;

before the water purification system starts to produce water, and when the time interval detected by the first timer is greater than or equal to a first preset time interval, the membrane filter core meets a preset flushing condition;

the water purification system further comprises a third valve body and a fourth valve body which are respectively and electrically connected with the controller; the third valve body is arranged on a pure water pipe between the membrane filter element and the ion exchange filter element, the water inlet end of the fourth valve body is communicated with the pure water pipe between the membrane filter element and the third valve body, and the water outlet end of the fourth valve body is communicated with the water inlet end of the second valve body;

2. The water purification system of claim 1, further comprising a second timer electrically connected to the controller, the second timer configured to detect a standby period of the water purification system;

before the water purification system starts to produce water, and when the standby time length detected by the second timer is greater than or equal to a first preset time length, the membrane filter core meets a preset flushing condition.

3. The water purification system of claim 2, further comprising a first TDS detection probe electrically connected to the controller, the first TDS detection probe being mounted within the membrane cartridge to detect a TDS value of pure water within the membrane cartridge;

4. A water purification system according to claim 1 or 3, further comprising a second TDS detection probe electrically connected to the controller, the second TDS detection probe being mounted at the pure water port of the membrane cartridge or on the pure water pipe between the membrane cartridge and the water inlet end of the fourth valve body to detect the TDS value of the pure water discharged from the membrane cartridge;

5. The water purification system of claim 1 or 3, further comprising a third timer electrically connected to the controller, the third timer configured to detect an operating time of the water purification system;

6. A water purification system according to claim 1 or 3, further comprising a flow meter electrically connected to the controller, the flow meter being mounted at the pure water port of the membrane cartridge to detect a pure water flow value through the pure water port;

7. A water purification system according to any one of claims 1-3, further comprising a waste water flush valve;

8. A water purification system as claimed in any one of claims 1 to 3, further comprising a waste water return valve, the water inlet end of the waste water return valve being in communication with the waste water pipe and the water outlet end of the waste water return valve being in communication with the raw water pipe.

9. A water purification system as claimed in any one of claims 1 to 3, further comprising a pre-filter element mounted to the raw water pipe.

10. A water purification system as claimed in any one of claims 1 to 3, further comprising a post-filter element mounted to a pure water pipe between the membrane element and the ion exchange element.

11. The water purification system of claim 10, further comprising a one-way valve mounted on the pure water pipe between the post-cartridge and the ion exchange cartridge.