CN218596186U - Flow adjustable water purification system - Google Patents

Abstract

The utility model discloses a water purification system with adjustable flow, which comprises a membrane filter medium, wherein the membrane filter medium is provided with a water inlet end, a pure water end and a waste water end, the water inlet end is connected with a raw water pipeline, the pure water end is connected with a pure water pipeline, and the waste water end is connected with a waste water pipeline; a pure water discharge valve component is arranged on the pure water production path, a pure water return pipeline is arranged between the pure water production path and the raw water pipeline, and a pure water return valve component for controlling the return flow of the pure water is arranged on the pure water return pipeline; a waste water return pipeline is also arranged between the waste water pipeline and the raw water pipeline, and a waste water return valve component for controlling the waste water return flow is arranged on the waste water return pipeline; the pure water pipeline is also provided with a first flow detection device for detecting pure water discharge flow to adjust the pure water backflow valve component and the wastewater backflow valve component, so as to solve the problem of overhigh overall pressure of the water channel caused by the fact that pure water and wastewater cannot be discharged quickly, and enable the water channel to be in a safe and reliable working state.

Description

Flow adjustable water purification system

Technical Field

The utility model relates to a water purification technology field especially relates to a flow adjustable water purification system.

Background

With the rapid development of water purification technology, water purification systems that perform filtration through devices such as reverse osmosis pressure membranes are becoming more popular.

The reverse osmosis pressure membrane of water purification system when realizing filtering capability, treats that the water of filtration side needs to possess certain water pressure, for this reason needs to set up supercharging device in the upstream side of reverse osmosis pressure membrane to make the raw water can pass through reverse osmosis pressure membrane smoothly, so, when pure water and/or waste water through the filtration reposition of redundant personnel of reverse osmosis pressure membrane can not discharge fast, can make whole water route pressure be in a higher state, have the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above prior art at least one kind of defect, the utility model provides a flow adjustable water purification system aims at guaranteeing that water route pressure can not be too high to make the water route be in a safe and reliable's operating condition.

The utility model discloses a solve the technical scheme that its problem adopted and be:

a flow adjustable water purification system, comprising: the membrane filter medium is provided with a water inlet end, a pure water end and a waste water end, the water inlet end is connected with a raw water pipeline, the pure water end is connected with a pure water pipeline, the waste water end is connected with a waste water pipeline, and the raw water pipeline is provided with a supercharging device; a pure water return pipeline is arranged between the pure water pipeline and the raw water pipeline, a pure water return valve component for controlling pure water return flow is arranged on the pure water return pipeline, a connection point of the pure water return pipeline and the pure water pipeline is a first pure water return intersection, and a pure water discharge valve component is arranged between the first pure water return intersection and a discharge port of the pure water pipeline; a waste water return pipeline is arranged between the waste water pipeline and the raw water pipeline, and a waste water return valve component for controlling waste water return flow is arranged on the waste water return pipeline; and a first flow detection device for detecting pure water discharge flow is arranged between the first pure water backflow intersection point and the pure water discharge valve assembly so as to adjust the opening or closing of the pure water backflow valve assembly and the wastewater backflow valve assembly.

The utility model discloses a flow adjustable water purification system, the aperture through adjusting pure water discharge valve subassembly is with control pure water discharge flow, on this basis, through first flow detection device detection pure water discharge flow to control pure water return valve subassembly and waste water return valve subassembly's switch or aperture. When the pure water discharge flow is judged to be equal to the maximum water production flow, the pure water discharge valve assembly is not completely opened at the moment, and the pure water return valve assembly is closed, so that the pure water discharge of the pure water discharge pipeline is at the highest efficiency; when judging that pure water discharge is lower than the maximum water making flow, the pure water discharge valve component is not completely opened at the moment, the switch or the opening degree of the pure water backflow valve component and the wastewater backflow valve component is adjusted, so that partial pure water flows back through the pure water backflow pipeline, partial wastewater flows back through the wastewater backflow pipeline, so that the pressure of the whole water channel is in a reasonable range, so that the whole water channel is in a safe and reliable working state, and the partial pure water flow back to the upstream of the membrane filter medium, the flow velocity of the upstream of the membrane filter medium is ensured, the membrane surface of the membrane filter medium can be washed more fully, a cleaning effect is achieved, the service life of the membrane filter medium is prolonged favorably, on the other hand, when making water at low flow, the discharge amount of the wastewater is reduced through the backflow of partial wastewater, energy conservation and emission reduction are realized, and the water production rate is improved.

As an optional implementation mode, in the embodiment of the utility model, be equipped with leading water storage device on the former water pipeline, the pure water return line with the tie point of former water pipeline is second pure water backward flow intersect, second pure water backward flow intersect is located leading water storage device's upper reaches, leading water storage device is used for the buffer memory former water pipeline the raw water with the pure water of pure water return line backward flow.

So set up, leading water storage device is used for the raw water of buffer memory former water pipeline and the pure water of pure water return line backward flow to make water pressure reduce, also can be used to the leading filtration of raw water.

As an optional implementation manner, in an embodiment of the present invention, a second flow rate detection device for detecting a pure water backflow flow rate is disposed on the pure water backflow pipeline; and a third flow detection device for detecting the wastewater backflow flow is arranged on the wastewater backflow pipeline.

So set up, detect pure water backward flow through this second flow detection device to adjust pure water backward flow valve member's aperture, thereby can further adjust pure water backward flow, detect waste water backward flow through this third flow detection device, with the aperture of adjusting waste water backward flow valve member, thereby can further adjust waste water backward flow, thereby make water path pressure safe more reasonable.

As an optional implementation manner, in an embodiment of the present invention, the connection point of the pure water return pipeline and the raw water pipeline is a second pure water return intersection, the connection point of the wastewater return pipeline and the raw water pipeline is a second wastewater return intersection, and the second pure water return intersection and the second wastewater return intersection are located upstream of the pressure boosting device.

So set up, the water pressure of supercharging device's the upper reaches is lower to it is easier to make the pure water backward flow and waste water backward flow.

As an optional implementation manner, in an embodiment of the present invention, a first check valve for preventing backflow of the water body is disposed on the pure water return line;

with this arrangement, the first check valve prevents the pure water from flowing back toward the first pure water return intersection when the water pressure in the pure water return line is low, or prevents the raw water in the raw water line from flowing from the second pure water return intersection toward the first pure water return intersection.

As an optional implementation manner, in an embodiment of the present invention, a second check valve for preventing the backflow of the water body is disposed on the wastewater backflow pipeline.

So set up, the second check valve prevents because of when waste water return line water pressure is lower, and waste water flows back to first waste water backward flow intersect, perhaps prevents that the raw water on the former water pipe way from the second waste water backward flow intersect to first waste water backward flow intersect and flow.

As an alternative, in the embodiment of the present invention, a post-filter medium is disposed between the membrane filter medium and the pure water discharge valve assembly.

So set up, rearmounted filter medium is located pure water road's arbitrary point, rearmounted filter medium has the function of buffering head cup water total dissolved solid value, is favorable to guaranteeing that the pure water total dissolved solid value of output is in lower level.

As an optional implementation manner, in an embodiment of the present invention, the first flow rate detecting device is a flow meter or a valve assembly opening degree detector.

So set up, through installing valve assembly opening detector on pure water discharge valve assembly with the switch or the aperture of detecting pure water discharge valve assembly, perhaps, through set up the flowmeter between the pure water discharge port of producing the way at first pure water backward flow intersect and pure water with detection pure water discharge flow, simple structure, the function is realized easily, low in production cost.

As an optional implementation manner, in an embodiment of the present invention, a connection point of the wastewater return line and the wastewater production line is a first wastewater return intersection, and a wastewater discharge valve assembly for controlling a wastewater discharge flow rate is disposed between the first wastewater return intersection and a wastewater discharge port of the wastewater production line.

So set up, through adjusting the waste water discharge valve assembly the switch or the aperture controllable waste water discharge flow.

As an alternative embodiment, in the embodiment of the present invention, a fourth flow detection device for detecting the discharge flow of the waste water is disposed between the first waste water backflow intersection and the waste water discharge valve assembly.

So set up, detect the waste water discharge flow through the fourth flow detection device to adjust the switch or the aperture of waste water discharge valve subassembly.

To sum up, the utility model provides a pair of flow adjustable water purification system has following beneficial technological effect at least: set up the pure water return line of the former water pipe of intercommunication on pure water production way, on this basis, still be equipped with the first flow detection device who is used for detecting pure water discharge between first pure water backward flow crosspoint and the pure water discharge valve subassembly, after first flow detection device detects the numerical value of pure water discharge, adopt the intelligent control mode, control the switch or the aperture of pure water return valve subassembly and waste water return valve subassembly, make partial pure water get into the pure water return line, make partial waste water get into waste water return line, effectively solve when pure water and/or waste water that filter the reposition of redundant personnel through membrane filter medium can not discharge fast, the problem that whole waterway pressure is higher can be made, the emission of reduction waste water that can the at utmost, the maximize saves water, and the upstream velocity of flow of membrane filter medium has been guaranteed, can be more abundant wash membrane filter medium's membrane surface, in order to play clean effect, be favorable to prolonging membrane filter medium's life-span.

Drawings

Fig. 1 is a schematic view of a first structure of a first embodiment of a water purification system of the present invention.

Fig. 2 is a second schematic structural view of the first embodiment of the water purification system of the present invention.

Fig. 3 is a third schematic structural view of the first embodiment of the water purification system of the present invention.

Fig. 4 is a schematic view of a second embodiment of the water purification system of the present invention.

Fig. 5 is a second schematic structural diagram of a second embodiment of the water purification system of the present invention.

Wherein the reference numerals have the following meanings:

1-a membrane filtration medium; 2-raw water valve assembly; 3-a supercharging device; 4-pure water discharge valve assembly; 5-a pure water return valve assembly; 6-a waste water discharge valve assembly; 7-a waste water return valve assembly; 8-a first flow detection device; 9-a second flow detection device; 10-a third flow detection device; 11-a fourth flow detection device; 12-a first non-return valve; 13-a second non-return valve; 14-a front water storage device; 15-post filter media; a-a first pure water reflux intersection; b-a second pure water reflux intersection; c-first wastewater return crossover point; d-second wastewater return intersection.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example one

As shown in fig. 1-3, the utility model discloses a water purification system with adjustable flow, which comprises a membrane filter medium 1, wherein the membrane filter medium 1 is provided with a water inlet end, a pure water end and a waste water end, the water inlet end is connected with a raw water pipeline, the pure water end is connected with a pure water pipeline, and the waste water end is connected with a waste water pipeline;

the raw water pipeline is provided with a raw water valve assembly 2, a second pure water backflow intersection B, a second wastewater backflow intersection D and a supercharging device 3, the supercharging device 3 is positioned at the downstream of the second pure water backflow intersection B and the second wastewater backflow intersection D, namely the second pure water backflow intersection B and the second wastewater backflow intersection D can be positioned at any point of the upstream of the supercharging device 3; wherein the supercharging device 3 is a water pump.

A pure water discharge valve component 4 is arranged on the pure water production path, a first pure water backflow intersection A is arranged between the membrane filter medium 1 and the pure water discharge switch, a pure water backflow pipeline is arranged between the first pure water backflow intersection A and the second pure water backflow intersection B, and a pure water backflow valve component 5 is arranged on the pure water backflow pipeline;

a wastewater discharge valve component 6 is arranged on the wastewater production path, a first wastewater backflow intersection C is arranged between the membrane filter medium 1 and the wastewater discharge valve component 6, a wastewater backflow pipeline is arranged between the first wastewater backflow intersection C and the second wastewater backflow intersection D, and a wastewater backflow valve component 7 is arranged on the wastewater backflow pipeline;

wherein, still be equipped with the first flow detection device 8 that is used for detecting pure water discharge flow between first pure water backward flow intersect A and the pure water discharge valve subassembly 4, specifically, first flow detection device 8 is the flowmeter, adopts the intelligent control mode to make first flow detection device 8 obtain after detecting numerical value, the switch or the aperture of automatic control pure water backward flow valve subassembly 5 and waste water backward flow valve subassembly 7, and is simple and convenient, and the technical personnel in the field can understand, and the aperture refers to the size that the switch was opened. Specifically, the first flow rate detection device 8 detects the flow rate of the pure water discharge valve assembly 4 and outputs a detection signal to the intelligent control unit, and the intelligent control unit analyzes the detection signal to complete logic determination and outputs a control signal to the pure water return valve assembly 5 and the wastewater return valve assembly 7, thereby adjusting the return flow rates of the pure water return line and the wastewater return line.

The utility model discloses during the use, outside raw water source switch-on raw water pipeline. When water is produced, the raw water valve assembly 2, the pure water discharge valve assembly 4 and the waste water discharge valve assembly 6 are opened. Thus, raw water enters the raw water pipeline under the action of water pressure and is pressurized through the pressurizing device 3, so that the raw water enters the membrane filter medium 1 from the water inlet end, the raw water is filtered by the membrane filter medium 1, pure water is prepared at the pure water end, and waste water is prepared at the waste water end, wherein the pure water is directly discharged from the pure water discharge pipeline for users, and the waste water is directly discharged from the waste water discharge pipeline.

Importantly, the pure water discharge flow is controlled by adjusting the opening degree of the pure water discharge valve assembly 4, and on the basis, after the first flow detection device 8 detects the numerical value of the pure water discharge flow, the intelligent control mode is adopted to control the opening and closing of the pure water return valve assembly 5 and the wastewater return valve assembly 7. When the pure water discharge flow is judged to be equal to the maximum water production flow, the pure water discharge valve assembly is fully opened at the moment, and the pure water return valve assembly 5 is closed, so that the pure water discharge of the pure water discharge pipeline is at the highest efficiency; when judging pure water discharge flow and being less than the biggest system water flow, pure water discharge valve subassembly was not opened completely this moment, adjusted pure water backward flow valve subassembly 5 and waste water backward flow valve subassembly 7's switch or aperture for partly pure water flows back through the pure water return line, makes partly waste water flow back through waste water return line, thereby makes whole waterway pressure at reasonable within range, so that whole waterway is in a safe and reliable's operating condition.

More specifically, the pure water gets into the pure water road from the pure water end, when the aperture of adjusting pure water discharge valve subassembly 4 makes pure water discharge flow be less than the biggest system water flow, adopt intelligent control, open pure water backward flow valve subassembly 5 or increase the aperture of pure water backward flow valve subassembly 5, therefore under the water pressure effect, partial pure water gets into the pure water return line through first pure water backward flow crosspoint A, and flow back to second pure water backward flow crosspoint B with reentrant former water road and flow to membrane filter medium 1, realize the circulatory flow of pure water. The device has the advantages that the water pressure of the pure water pipeline is reduced through pure water backflow, so that the overall pressure of the water pipeline is in a reasonable range, and potential safety hazards are eliminated; further, partial pure water flows back to the upper reaches of membrane filtration medium 1, has guaranteed the upstream velocity of flow of membrane filtration medium 1, can be more abundant wash the membrane surface of membrane filtration medium 1 to play clear effect, be favorable to prolonging membrane filtration medium 1's life-span, wherein, partial pure water backward flow can dilute the water concentration who gets into membrane filtration medium 1 and intake the end, realizes washing repeatedly soaking membrane filtration medium 1, and then reduces the total dissolved solid value of pure water end pure water.

More specifically, wastewater enters the wastewater pipeline from the wastewater end, when the opening of the pure water discharge valve component 4 is adjusted to enable the pure water discharge flow to be lower than the maximum water production flow, intelligent control is adopted to open the wastewater backflow valve component 7 or increase the opening of the wastewater backflow valve component 7, and at the moment, the wastewater discharge valve component 6 is partially or completely opened to enable the wastewater to be directly discharged; therefore, under the action of water pressure, part of wastewater enters the wastewater return pipeline through the first wastewater return intersection C, and returns to the second wastewater return intersection D to reenter the original water pipeline and flow to the membrane filter medium 1, the wastewater circularly flows, the repeated filtration of the membrane filter medium 1 can be realized, the wastewater concentration is improved, and in the low-flow water production process, the discharge amount of the wastewater is reduced through returning part of the wastewater, the energy is saved, the emission is reduced, the water production rate is improved, part of the wastewater returns to the upstream of the membrane filter medium 1, the upstream flow rate of the membrane filter medium 1 can also be improved, and the membrane surface of the membrane filter medium 1 can be more fully scoured.

Preferably, a preposed water storage device 14 is further arranged on the raw water pipeline, and the preposed water storage device 14 can be arranged at any position on the upstream of the supercharging device 3.

Referring to fig. 1, in a preferred embodiment, a second pure water return intersection B, a pre-water storage device 14 and a second wastewater return intersection D are located upstream of the pressurizing device 3, and the pre-water storage device 14 is located downstream of the second pure water return intersection B and upstream of the second wastewater return intersection D. The advantage of so setting up is that second pure water backward flow intersect B and leading water storage device 14 all are located the upper reaches of second waste water backward flow intersect D, so can reduce the possibility that pure water backward flow pipeline pollutes and take place to make leading water storage device 14 can buffer more pure water that flows backward, thereby make the effect that pure water backward flow pipeline reduces water pressure improve.

Referring to fig. 2, in a preferred embodiment, the pre-water storage means 14 is located downstream of the second pure water return intersection B and the second wastewater return intersection D and upstream of the pressure boosting means 3. The benefit that so sets up is, when pure water and waste water circulation reflux respectively, assemble on former water pipeline, the leading water storage device 14 that sets up this moment is equivalent to the blender of pure water and waste water, makes the mixture of pure water and waste water comparatively abundant, and the quality of water of intaking of buffer membrane filter medium 1 to membrane filter medium 1, be favorable to even quality of water, in order to keep stable play water quality of water, and then guarantee that 1 operational environment of membrane filter medium is stable, guarantee to go out the water performance steady.

Referring to fig. 3, in a preferred embodiment, the second wastewater return intersection D, the pre-water storage device 14 and the second pure water return intersection are located upstream of the pressure boosting device 3, and the pre-water storage device 14 is located downstream of the second wastewater return intersection D and upstream of the second pure water return intersection B. The advantage of so setting up is that the waste water of backward flow can be backed up to the pure water of backward flow and the priority gets into membrane filtration medium 1, effectively delays the time that waste water got into membrane filtration medium 1 like this to make the concentration of the water that gets into membrane filtration medium 1 keep lower level, and retrieved partial waste water simultaneously, reached the water conservation purpose.

The front water storage device 14 is a container with a certain volume, and can be any device with a certain volume and capable of containing water, such as a filter element, a tank body, a pipeline and the like.

Preferably, the post-filter medium 15 is arranged between the membrane filter medium 1 and the pure water discharge valve assembly 4, the water quality and taste of the pure water are further improved through the post-filter medium 15, and in addition, the post-filter medium 15 has the function of buffering the total dissolved solid value of the head cup water, so that the total dissolved solid value of the produced pure water is favorably ensured to be at a lower level. Wherein, the post-filter 15 can be arranged at any position between the membrane filter 1 and the pure water discharge valve assembly 4.

As shown in fig. 1-3, in a preferred embodiment, the post-filter 15 is disposed between the first pure water backflow junction a and the pure water discharge valve assembly 4, so as to prevent pure water from passing through the post-filter 15 each time pure water flows back, thereby reducing the number of times the post-filter 15 filters, and advantageously prolonging the service life of the post-filter 15.

Wherein, the membrane filtering medium 1 can be made of materials such as RO membrane, ultrafiltration and nanofiltration, etc.

Wherein, the pure water discharge valve component 4, the pure water return valve component 5, the wastewater discharge valve component 6, the wastewater return valve component 7 and the raw water valve component 2 can be regulating valves, check valves, combination valves and the like.

The first flow rate detecting device 8 is provided in various manners, for example, the first flow rate detecting device 8 is an opening degree detector provided in the pure water discharge valve assembly 4, and for example, the first flow rate detecting device 8 is a flow meter provided between the first pure water return intersection a and the pure water discharge valve assembly 4.

Therefore, the utility model provides a flow adjustable water purification system, pure water produces the pure water return line that sets up intercommunication water pipeline on the way, on this basis, still be equipped with the first flow detection device 8 that is used for detecting pure water discharge flow between first pure water backward flow intersect A and the pure water discharge valve subassembly 4, after first flow detection device 8 detects the numerical value of pure water discharge flow, adopt the intelligent control mode, control the opening or closing of pure water return valve subassembly 5, make partial pure water get into the pure water return line, effectively solve when the pure water of shunting through reverse osmosis pressure membrane filtration can not discharge fast, can make the higher problem of whole water route pressure ratio; further, through set up the waste water return line that communicates former water pipeline on waste water produces the way, after first flow detection device 8 detects the numerical value of pure water discharge flow, adopt the intelligent control mode, control waste water backflow valve subassembly 7 switches or aperture for partial waste water gets into waste water return line, has reduced water channel pressure, the emission of reduction waste water that can the at utmost, the maximize saves the water.

Example two

On the basis of the first embodiment, as shown in fig. 4 to 5, a second flow rate detection device 9 for detecting a pure water backflow flow rate is arranged on the pure water backflow pipeline; the wastewater return pipeline is provided with a third flow detection device 10 for detecting the wastewater return flow; a fourth flow rate detecting means 11 for detecting a discharge flow rate of the waste water is provided between the first waste water returning cross point C and the waste water discharge valve assembly. The advantage of so setting up is, detect the pure water backflow flowrate through this second flow detection device 9, adopt the intelligent control in order to further adjust the aperture of the backflow valve assembly 5 of pure water, thus can adjust the pure water backflow flowrate; the third flow detection device 10 is used for detecting the wastewater backflow flow, and intelligent control is adopted to further adjust the opening degree of the wastewater backflow valve assembly 7, so that the wastewater backflow flow can be adjusted; the discharge flow rate of the waste water is detected by the fourth flow detecting means 11, and the intelligent control is adopted to further adjust the opening degree of the waste water discharge valve assembly 6. Therefore, the waterway pressure is in a safer and more reasonable state.

Referring to fig. 5, in a preferred embodiment, the pure water return line is provided with a first check valve 12 for preventing the water from flowing back; and a second check valve 13 for preventing the water body from flowing back is arranged on the wastewater return pipeline. Thus, the first check valve 12 prevents the pure water from flowing back to the first pure water return intersection a when the water pressure in the pure water return line is low, or prevents the raw water in the raw water line from flowing from the second pure water return intersection B to the first pure water return intersection a; the second check valve 13 prevents the wastewater from flowing back toward the first wastewater backflow intersection C due to a low water pressure of the wastewater backflow line, or prevents the raw water on the raw water line from flowing toward the first wastewater backflow intersection C from the second wastewater backflow intersection D.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by combining the above technical features at will. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims (10)

1. The utility model provides a flow adjustable water purification system which characterized in that includes:

the membrane filtration device comprises a membrane filtration medium (1), wherein a water inlet end, a pure water end and a waste water end are arranged on the membrane filtration medium (1), the water inlet end is connected with a raw water pipeline, the pure water end is connected with a pure water pipeline, the waste water end is connected with a waste water pipeline, and the raw water pipeline is provided with a supercharging device (3);

a pure water return pipeline is arranged between the pure water pipeline and the raw water pipeline, a pure water return valve component (5) for controlling pure water return flow is arranged on the pure water return pipeline, a connection point of the pure water return pipeline and the pure water pipeline is a first pure water return intersection, and a pure water discharge valve component (4) is arranged between the first pure water return intersection and a discharge port of the pure water pipeline;

a waste water return pipeline is arranged between the waste water pipeline and the raw water pipeline, and a waste water return valve assembly (7) for controlling the return flow of waste water is arranged on the waste water return pipeline;

and a first flow detection device (8) for detecting pure water discharge flow is further arranged between the first pure water reflux intersection point and the pure water discharge valve assembly (4) so as to adjust the opening and closing of the pure water reflux valve assembly (5) and the wastewater reflux valve assembly (7).

2. The water purification system according to claim 1, wherein a pre-water storage device (14) is disposed on the raw water pipeline, a connection point of the pure water return pipeline and the raw water pipeline is a second pure water return cross point, the second pure water return cross point is disposed upstream of the pre-water storage device (14), and the pre-water storage device (14) is configured to buffer raw water in the raw water pipeline and pure water returned by the pure water return pipeline.

3. The water purification system of claim 1, wherein the pure water return line is provided with a second flow detection device (9) for detecting the return flow of pure water; and a third flow detection device (10) for detecting the return flow of the wastewater is arranged on the wastewater return pipeline.

4. Water purification system according to claim 1, wherein the connection point of the pure water return line to the raw water line is a second pure water return intersection point, and the connection point of the waste water return line to the raw water line is a second waste water return intersection point, the second pure water return intersection point and the second waste water return intersection point being located upstream of the pressure boosting device (3).

5. Water purification system according to claim 1, wherein a post filter medium (15) is provided between the membrane filter medium (1) and the pure water discharge valve assembly (4).

6. A water purification system as claimed in claim 1, wherein the pure water return line is provided with a first non-return valve (12) for preventing the backflow of the water body.

7. A water purification system as claimed in claim 1, wherein the waste water return line is provided with a second non-return valve (13) for preventing the backflow of the body of water.

8. Water purification system according to claim 1, wherein the first flow detection means (8) is a flow meter or a valve assembly opening detector.

9. The water purification system of claim 1, wherein the connection point of the wastewater return line and the wastewater production line is a first wastewater return intersection, and a wastewater discharge valve assembly (6) for controlling a wastewater discharge flow rate is provided between the first wastewater return intersection and a wastewater discharge port of the wastewater production line.

10. The water purification system of claim 9, wherein a fourth flow detection means (11) for detecting a discharge flow of wastewater is provided between the first wastewater return junction and the wastewater discharge valve assembly (6).

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