CN215905966U

CN215905966U - Water purification system

Info

Publication number: CN215905966U
Application number: CN202122171350.2U
Authority: CN
Inventors: 王汉领; 陈小波; 印彩霞
Original assignee: AO Smith China Water Heater Co Ltd; AO Smith China Environmental Products Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd; AO Smith China Environmental Products Co Ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-02-25
Anticipated expiration: 2031-09-08

Abstract

The utility model discloses a water purification system, which relates to the technical field of water treatment, and comprises: a first filter unit; a second filter unit, an inlet of which can be communicated with an outlet of the first filter unit; a pressurizing device which drives the water in the first filtering unit to flow to the second filtering unit; the two ends of the first wastewater return water path are respectively communicated with the wastewater outlet of the second filtering unit and the raw water inlet of the second filtering unit, and a first flow limiting unit is arranged on the first wastewater return water path; and the wastewater discharge waterway is communicated with the wastewater outlet of the second filtering unit and is at least provided with a second flow limiting unit. This application can reduce the discharge amount of waste water and avoid the waste of water resource when water purification system uses.

Description

Water purification system

Technical Field

The utility model relates to the technical field of water treatment, in particular to a water purification system.

Background

In the existing water purification system, when the raw water is filtered by using the filter unit which needs to discharge the waste water, because the filter unit stops being used for a long time, the raw water or partial waste water on the raw water side in the filter unit can slowly permeate through the filter membrane to reach the water purification side, thereby causing the TDS value of partial purified water which is just output by the water purification system to be higher. Therefore, the inside raw water side of the filter unit can be washed by using the purified water generated by the water purification system, so that the original raw water or part of the waste water is replaced, the purified water stays on the raw water side, and the problem that the TDS value of the part of the purified water just output by the water purification system is higher can not be caused.

However, when the raw water side in the filter unit is washed by the purified water generated by the water purification system, the filter unit needs to discharge wastewater, and the wastewater at the moment is directly discharged from the water purification system, so that the waste of water resources is caused to a certain extent.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above defects in the prior art, an embodiment of the present invention provides a water purification system, which can reduce the amount of wastewater discharged during the use of the water purification system to avoid water waste.

The specific technical scheme of the embodiment of the utility model is as follows:

a water purification system, the water purification system comprising:

a first filter unit;

a second filter unit, an inlet of which can be communicated with an outlet of the first filter unit;

a pressurizing device which drives the water in the first filtering unit to flow to the second filtering unit;

the two ends of the first wastewater return water path are respectively communicated with the wastewater outlet of the second filtering unit and the raw water inlet of the second filtering unit, and a first flow limiting unit is arranged on the first wastewater return water path;

and the wastewater discharge waterway is communicated with the wastewater outlet of the second filtering unit and is at least provided with a second flow limiting unit.

Preferably, the first wastewater return water path can be switched on and off.

Preferably, the water purification system further comprises: and the second wastewater backflow waterway is provided with a third flow limiting unit, one end of the second wastewater backflow waterway is communicated with the inlet of the first filtering unit, and the other end of the second wastewater backflow waterway is communicated with the wastewater outlet of the second filtering unit.

Preferably, the other end of the second wastewater backflow waterway is connected to the wastewater outlet of the second filtering unit;

alternatively, a second on-off valve may be provided on the first wastewater return channel, and the other end of the second wastewater return channel may be connected between the second on-off valve and the first restrictor.

Preferably, the water purification system further comprises:

the two ends of the first purified water backflow waterway are respectively communicated with the purified water outlet of the second filtering unit and the inlet of the first filtering unit.

Preferably, the water purification system has at least two states, in a first state, the purified water outlet of the second filter unit and the inlet of the first filter unit are in a communication state through the first purified water return waterway, the waste water outlet of the second filter unit and the raw water inlet of the second filter unit are in a communication state through the first waste water return waterway, and the pressure boosting device is in an open state;

in a second state, the waste water outlet of the second filtering unit and the raw water inlet of the second filtering unit are in a disconnected state through the first waste water backflow waterway, the waste water outlet of the second filtering unit and the inlet of the first filtering unit are in a communicated state through the second waste water backflow waterway, and the supercharging device is in an opened state.

Preferably, in the second state, the purified water outlet of the second filter unit and the inlet of the first filter unit are in a communication state through the first purified water return waterway.

Preferably, the water purification system further comprises:

and the two ends of the second purified water return waterway are respectively communicated with the purified water outlet of the second filtering unit and the raw water inlet of the second filtering unit.

Preferably, in the second state, the purified water outlet of the second filter unit and the inlet of the first filter unit are in a disconnected state by the first purified water return waterway.

Preferably, the first purified water return water path is provided with a first open/close valve and a first check valve which is communicated from the purified water outlet of the second filter unit to the inlet of the first filter unit.

Preferably, a second check valve communicated from the waste water outlet of the second filtering unit to the raw water inlet of the second filtering unit is arranged on the first waste water return water path.

Preferably, the third flow restriction unit includes a flow restriction hole structure.

Preferably, a third one-way valve which is communicated from the waste water outlet of the second filtering unit to the inlet of the first filtering unit is arranged on the second waste water return water path.

Preferably, the fourth flow restricting unit includes a flow restricting hole structure.

Preferably, a fourth check valve communicated from the purified water outlet of the second filtering unit to the raw water inlet of the second filtering unit is disposed on the second purified water return water path.

Preferably, the pressure boosting device is connected between the outlet of the first filtering unit and the raw water inlet of the second filtering unit, and two ends of the first wastewater backflow waterway are respectively connected with the wastewater outlet of the second filtering unit and the inlet of the pressure boosting device;

the water purification system still includes:

and the two ends of the second purified water return water channel are respectively connected with the purified water outlet of the second filtering unit and the inlet of the supercharging device.

Preferably, the pressure boosting device is connected to the downstream of the purified water outlet of the second filtering unit, and two ends of the first purified water return waterway are respectively connected to the downstream of the pressure boosting device and the inlet of the first filtering unit;

the water purification system still includes:

and the two ends of the second purified water return water channel are respectively connected with the downstream of the supercharging device and the raw water inlet of the second filtering unit.

Preferably, the water purification system further comprises:

the inlet of the third filtering unit can be communicated with the purified water outlet of the second filtering unit;

a second purified water return waterway provided with a fourth flow limiting unit, wherein two ends of the second purified water return waterway are respectively communicated with the purified water outlet of the third filtering unit and the raw water inlet of the second filtering unit;

and the two ends of the first purified water backflow waterway are respectively communicated with the outlet of the third filtering unit and the inlet of the first filtering unit.

Preferably, the third filter unit comprises a post-filter cartridge.

Preferably, the first filter unit comprises a pre-filter cartridge.

Preferably, the second filter unit comprises at least one of: a reverse osmosis membrane filter core and a nanofiltration membrane filter core.

Preferably, the first flow restriction unit includes a flow restriction hole structure; and/or the second flow restricting unit comprises a flow restricting orifice structure.

Preferably, the wastewater discharge water path is provided with a first water path and a second water path which are connected in parallel, the first water path is provided with a third opening and closing valve, the second flow limiting unit is positioned on the second water path, and the second water path is further provided with a fourth opening and closing unit.

The technical scheme of the utility model has the following remarkable beneficial effects:

the water purification system in this application can reduce the waste water discharge volume and avoid the waste of water resource when using. When water purification system need wash, open supercharging device, under the effect of the first current-limiting unit on first waste water backward flow water route, the second filter unit filters and obtains waste water, and waste water can flow back to the raw water import of second filter unit through first waste water backward flow water route. Through the mode, the waste water which is discharged by the water purification system in the stage can flow back to the raw water inlet of the second filtering unit, so that the waste of water resources can be avoided to a certain extent.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the utility model may be employed. It should be understood that the embodiments of the utility model are not so limited in scope. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the utility model as a matter of case.

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 a waste water discharge circuit in one embodiment of the present invention;

fig. 3 is a schematic structural diagram of a water purification system in another embodiment of the utility model.

Reference numerals of the above figures:

1. a water inlet valve; 2. a first filter unit; 3. a second filter unit; 4. a pressure boosting device; 5. a first purified water return waterway; 6. a first wastewater return waterway; 7. a second wastewater return waterway; 8. a third current limiting unit; 9. a second purified water return waterway; 10. a fourth current limiting unit; 11. a first check valve; 12. a second one-way valve; 13. a third check valve; 14. a fourth check valve; 15. a third filtering unit; 16. a water output mechanism; 17. a wastewater discharge waterway; 171. a first waterway; 1711. a third opening and closing valve; 172. a second waterway; 1722. a fourth opening valve; 18. a multifunctional valve; 19. a first opening/closing valve; 20. a second opening/closing valve; 21. a first current limiting unit; 22. a second current limiting unit.

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the utility model in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to reduce the discharge amount of waste water and avoid waste of water resources when the water purification system is used, a water purification system is provided in an embodiment of the present application, fig. 1 is a schematic structural diagram of the water purification system in an embodiment of the present invention, and as shown in fig. 1, the water purification system may include: a first filter unit 2; a second filtering unit 3, the inlet of which can communicate with the outlet of the first filtering unit 2; a pressurizing device 4 for driving the water in the first filter unit 2 to flow to the second filter unit 3; a first wastewater return water path 6, two ends of which are respectively communicated with a wastewater outlet of the second filtering unit 3 and a raw water inlet of the second filtering unit 3, wherein a first flow limiting unit 21 is arranged on the first wastewater return water path 6; and the waste water discharge waterway 17 can be communicated with the waste water outlet of the second filtering unit 3, and at least a second flow limiting unit 22 is arranged on the waste water discharge waterway 17.

The water purification system in this application can reduce the waste water discharge volume and avoid the waste of water resource when using. When the water purification system needs to be flushed, the supercharging device 4 is opened, the second filtering unit 3 can filter waste water under the action of the first flow limiting unit 21 on the first waste water backflow waterway 6, and the waste water can flow back to the raw water inlet of the second filtering unit 3 through the first waste water backflow waterway 6. By the mode, the waste water which is to be discharged by the water purification system in the stage can flow back to the raw water inlet of the second filtering unit 3, so that the waste of water resources can be avoided to a certain extent.

In order to be able to better understand the water purification system of the present application, it will be further explained and illustrated below. As shown in fig. 1, the water purification system may include: a first filtering unit 2, a second filtering unit 3, a pressure boosting device 4 and a first wastewater return water circuit 6. Wherein the inlet of the first filter unit 2 may be connected to a water supply, such as tap water, by connecting an inlet valve 1. The on-off between tap water and the first filtering unit 2 is controlled by the water inlet valve 1, so that the on-off of the water purifying system and a water source is controlled. A certain amount of water can be contained in the first filter unit 2 so that the purified water filtered by the second filter unit 3 can be stored, and the second filter unit 3 is washed by the part of the purified water.

As shown in fig. 1, the inlet of the second filter unit 3 can communicate with the outlet of the first filter unit 2. Wherein, the inlet of the second filter unit 3 can be directly communicated with the outlet of the first filter unit 2, or can be communicated with the outlet of the first filter unit 2 after passing through the pressure increasing device 4. The second filter unit 3 may be of the type that requires the discharge of waste water during filtration.

The second filtering unit 3 may be a filtering unit such as a reverse osmosis membrane filter element, a nanofiltration membrane filter element, etc., and the specific type of the filtering unit is not limited in this application, and only the above requirements need to be satisfied. As a matter of course, the first filter unit 2 is any type of filter unit that is capable of storing a certain amount of water. For example, the first filter unit 2 can comprise a prefilter cartridge, which serves as a preliminary filter, so that the second filter unit 3 can achieve the purpose of fine filtration.

As shown in fig. 1, the pressurizing device 4 is used to drive the water in the first filter unit 2 to flow to the second filter unit 3. As a possibility, the pressure boosting device 4 may be connected between the outlet of the first filter unit 2 and the inlet of the second filter unit 3, which may also be connected downstream of the clean water outlet of the second filter unit 3.

As shown in fig. 1, both ends of the first wastewater return waterway 6 are respectively communicated with the wastewater outlet of the second filtering unit 3 and the raw water inlet of the second filtering unit 3. Further, the first wastewater backflow waterway 6 can realize on-off function. As a practical matter, the first wastewater return water channel 6 is provided with a second on-off valve 20, and the on-off function of the first wastewater return water channel 6 is realized by opening and closing the second on-off valve 20. The first wastewater return water channel 6 is provided with a first flow limiting unit 21, the first flow limiting unit 21 is used for limiting the flow of water flowing through the first wastewater return water channel 6, so that the water can only flow through at a small flow rate, and therefore, at a certain stage of flushing the second filtering unit 3, under the action of the first flow limiting unit 21, the second filtering unit 3 can filter the water to obtain wastewater, and the wastewater can flow back to the raw water inlet of the second filtering unit 3 through the first wastewater return water channel 6. The first flow restriction unit 21 may include a flow restriction hole structure, and the wastewater outlet of the second filter unit 3 is controlled to communicate with the raw water inlet of the second filter unit 3 at a small flow rate by a proper size of the flow restriction hole. In this way, the first flow limiting unit 21 has a simple structure and low cost, and can be conveniently installed in the water purification system without increasing the volume of the water purification system.

As shown in fig. 1, the first wastewater return water path 6 may be further provided with a second check valve 12 communicated from the wastewater outlet of the second filter unit 3 to the raw water inlet of the second filter unit 3, so as to prevent water that is not filtered by the second filter unit 3 from being directly discharged through the wastewater discharge water path 17 when the water purification system is normally supplied with water to the user.

As shown in fig. 1, a waste water discharge waterway 17 is in communication with the waste water outlet of the second filter unit 3. Fig. 2 is a schematic diagram illustrating a waste water discharge circuit in one embodiment of the present invention, and as shown in fig. 2, at least a second flow restriction unit 22 is disposed on the waste water discharge circuit 17. The second flow limiting unit 22 functions to control the waste water ratio of the second filtering unit 3 when the water purification system normally produces water to be supplied to the user.

As shown in fig. 2, the waste water discharge path 17 may be provided with a first water path 171 and a second water path 172 connected in parallel. The first water passage 171 is provided with a third opening/closing valve 1711, and the second water passage 172 is provided with a second flow restricting unit 22 and a fourth opening/closing valve 1722. The waste water discharge path 17 is used for discharging waste water when the water purification system normally filters water to supply purified water to a user. The second waterway 172 may function to control a wastewater ratio and may also perform a shut-off function. The first water path 171 may perform a function in which the wastewater discharge water path 17 is directly and completely opened to discharge wastewater. Preferably, as shown in fig. 3, the waste water discharge path 17 may be provided with a multifunctional valve 18, that is, a first water path 171 and a second water path 172 connected in parallel are integrated into one multifunctional valve 18, which may simultaneously perform the functions of controlling the waste water ratio, closing the valve, and directly opening the waste water discharge path 17 completely to discharge waste water.

As a practical matter, as shown in fig. 1, the water purification system may include: and the two ends of the second wastewater backflow waterway 7 are respectively communicated with the wastewater outlet of the second filtering unit 3 and the inlet of the first filtering unit 2. And a third flow limiting unit 8 is arranged on the second wastewater return water channel 7. The third flow limiting unit 8 is used for controlling the wastewater outlet of the second filtering unit 3 to be communicated with the inlet of the first filtering unit 2 under the condition of small flow, thereby realizing the purpose of controlling the wastewater ratio of the second filtering unit 3. As a possibility, the third flow restriction unit 8 may comprise a flow restriction orifice structure.

As a possibility, in one embodiment, as shown in fig. 3, the other end of the second wastewater return water path 7 may be connected to the wastewater outlet of the second filter unit 3. In another embodiment, as shown in fig. 1, the other end of the second wastewater return water path 7 is connected between the second on-off valve 20 and the first flow restricting unit 21. In this embodiment, when the water purification system needs to be flushed, when the second on-off valve 20 of the first wastewater return channel 6 is opened, the second filtering unit filters the wastewater under the action of the first flow limiting unit 21 of the first wastewater return channel 6, and the third flow limiting unit 8 is disposed on the second wastewater return channel 7, so that most of the wastewater flows back to the raw water inlet of the second filtering unit 3 through the first wastewater return channel 6, and substantially less wastewater flows into the second wastewater return channel 7.

As shown in fig. 1, the second wastewater return water path 7 may be provided with a third check valve 13 that is connected from the wastewater outlet of the second filtering unit 3 to the inlet of the first filtering unit 2. Can avoid water purification system when normal system water through above-mentioned structure, the water at water source directly flows to waste water discharge water route 17 through second waste water backward flow water route 7, also can avoid under first state, and the water purification of first water purification backward flow water route 5 backward flow gets into first waste water backward flow water route 6 after passing through second waste water backward flow water route 7.

As shown in fig. 1, the water purification system may include, as applicable: a first purified water return waterway 5. The both ends in first water purification backward flow water route 5 communicate the water purification export of second filter unit 3 and the import of first filter unit 2 respectively, and break-make function can be realized in first water purification backward flow water route 5. As a possibility, the first purified water return water path 5 is provided with a first on-off valve 19, and the on-off function of the first purified water return water path 5 is realized by opening and closing the first on-off valve 19. The first purified water return waterway 5 may further include a first check valve 11 that is connected from the purified water outlet of the second filtering unit 3 to the inlet of the first filtering unit 2.

As shown in fig. 1, when the water purification system supplies purified water to a user by normal filtration, the third opening/closing valve 1711 is closed, the fourth opening/closing valve 1722 is opened, and the first purified water recirculation water passage 5 is in an off state. The waste water generated in the water purification system is mostly discharged from the waste water discharge waterway 17. If the first wastewater backflow waterway 6 between the wastewater outlet of the second filtering unit 3 and the raw water inlet of the second filtering unit 3 has no other flow limiting mechanism, the first wastewater backflow waterway 6 needs to be disconnected, and if the first wastewater backflow waterway 6 has other flow limiting mechanisms, the first wastewater backflow waterway 6 can be disconnected or connected, and a small amount of wastewater backflow does not affect the water purification system.

The water purification system has at least two states, in the first state, the purified water outlet of the second filter unit 3 and the inlet of the first filter unit 2 are in a communicated state through the first purified water return waterway 5, the wastewater outlet of the second filter unit 3 and the raw water inlet of the second filter unit 3 are in a communicated state through the first wastewater return waterway 6, and the supercharging device 4 is in an open state. In the second state, the wastewater outlet of the second filtering unit 3 and the raw water inlet of the second filtering unit 3 are in a disconnected state by the first wastewater return water path 6, the wastewater outlet of the second filtering unit 3 and the inlet of the first filtering unit 2 are in a communicated state by the second wastewater return water path 7, and the pressurizing device 4 is in an open state. As a possibility, in the second state, the purified water outlet of the second filter unit 3 and the inlet of the first filter unit 2 may be brought into a communicating state by the first purified water return waterway 5.

When the water purification system needs to be flushed, the water purification system enters a first state firstly, the water inlet valve 1 can be closed at the moment, and the third opening and closing valve 1711 and the fourth opening and closing valve 1722 on the wastewater discharge water channel 17 are both closed. The control pressurizing device 4 is opened, the first opening and closing valve 19 is opened, the second opening and closing valve 20 is opened, the purified water filtered by the second filtering unit 3 flows back to the first filtering unit 2 through the first purified water return water path 5, and the waste water filtered by the second filtering unit 3 mostly flows back to the raw water inlet of the second filtering unit 3 through the first waste water return water path 6, so that the time lasts for a while, so that the water stored in the first filtering unit 2 is replaced by the purified water, and the more the replacement degree is, the better the replacement degree is. After that, the wastewater enters the second state, in which the water inlet valve 1 is closed, and the third opening/closing valve 1711 and the fourth opening/closing valve 1722 on the wastewater discharge water passage 17 are both closed. The pressurization device 4 is controlled to be opened, the second one-way valve 12 is closed, the first opening and closing valve 19 is opened, the purified water obtained by filtering of the second filtering unit 3 flows back to the first filtering unit 2 through the first purified water return water path 5, the waste water obtained by filtering of the second filtering unit 3 flows back to the inlet of the first filtering unit 2 through the second waste water return water path 7, and the purified water stored in the first filtering unit 2 can be replaced out together to flush the second filtering unit 3. In this way, the waste water and the clean water that the water purification system produced have all obtained make full use of in order to realize washing to second filter unit 3, and whole washing in-process can need not to discharge any waste water, has avoided the waste of water resource like this to a certain extent, can not discharge the water purification system with the water purification that makes yet, has also avoided the waste of water resource.

As a possibility, as shown in fig. 1, the water purification system may include: and a second purified water return waterway 9 provided with a fourth flow limiting unit 10, both ends of which are respectively communicated with the purified water outlet of the second filtering unit 3 and the raw water inlet of the second filtering unit 3. The fourth flow limiting unit 10 is used to control the purified water outlet of the second filtering unit 3 to be communicated with the raw water inlet of the second filtering unit 3 at a smaller flow rate, so that most of the purified water flowing out of the purified water outlet of the second filtering unit 3 flows back to the first filtering unit 2 in the first state, and most of the purified water flowing out of the purified water outlet of the second filtering unit 3 flows back to the raw water inlet of the second filtering unit 3 in the second state. As a practical matter, the fourth flow restriction unit 10 may include a flow restriction hole structure, and the clean water outlet of the second filter unit 3 is controlled to be communicated with the raw water inlet of the second filter unit 3 at a small flow rate by a proper size of the flow restriction hole.

As a matter of course, when the pressure boosting device 4 is connected between the outlet of the first filtering unit 2 and the raw water inlet of the second filtering unit 3, as shown in fig. 1, both ends of the second purified water return waterway 9 may be connected to the purified water outlet of the second filtering unit 3 and the inlet of the pressure boosting device 4, respectively; both ends of the first wastewater return water path 6 may be connected to the wastewater outlet of the second filtering unit 3 and the inlet of the pressurizing device 4, respectively. Through the structure, the supercharging device 4 can well realize the backflow of the waste water of the second filtering unit 3 in the first state and the backflow of the purified water of the second filtering unit 3 in the second state.

As a matter of course, when the pressure boosting device 4 is connected downstream of the purified water outlet of the second filtering unit 3, both ends of the second purified water return waterway 9 may be connected downstream of the pressure boosting device 4 and the raw water inlet of the second filtering unit 3, respectively; both ends of the first purified water return waterway 5 may be connected to the downstream of the pressurizing device 4 and the inlet of the first filtering unit 2, respectively. The purified water generated by the second filtering unit 3 can flow back under the action of the pressurizing device 4 through the structure.

When the water purification system comprises the second purified water return waterway 9, in the second state, the purified water outlet of the second filter unit 3 and the inlet of the first filter unit 2 may be in a disconnected state by the first purified water return waterway 5. That is, in the second state, the purified water filtered by the second filtering unit 3 may flow back to the inlet of the second filtering unit 3 through the second purified water return water path 9, so that the part of the purified water may be mixed with the replaced purified water in the first filtering unit 2, thereby forming a greater amount of purified water to flush the second filtering unit 3, and further improving the flushing effect.

As shown in fig. 1, the second purified water return water path 9 may be provided with a fourth check valve 14 that is connected from the purified water outlet of the second filter unit 3 to the raw water inlet of the second filter unit 3. Through the structure, on one hand, when the water purification system normally produces water, the water flowing out of the first filtering unit 2 is directly supplied to a user after being mixed with the purified water discharged from the purified water outlet of the second filtering unit 3 through the second purified water backflow waterway 9, so that the quality of the purified water output by the water purification system is reduced; on the other hand, in the first state, the purified water entering the first filter unit 2 can be prevented from being polluted by the water discharged from the first filter unit 2 and the wastewater returned from the first wastewater return waterway 6 entering the first purified water return waterway 5 through the second purified water return waterway 9.

As a possibility, as shown in fig. 1, the water purification system may include: a third filter unit 15, the inlet of which can be in communication with the clean water outlet of the second filter unit 3. The third filter unit 15 may be a post-filter unit or may be another type of filter unit. The two ends of the second purified water return waterway 9 can be respectively communicated with the purified water outlet of the third filtering unit 15 and the raw water inlet of the second filtering unit 3, and the two ends of the first purified water return waterway 5 are respectively communicated with the outlet of the third filtering unit 15 and the inlet of the first filtering unit 2. After that, the purified water produced by the second filtering unit 3 is purified by the third filtering unit 15 and then returned to the first filtering unit 2 or the second filtering unit 3. In other possible embodiments, the second purified water return waterway 9 and one end of the first purified water return waterway may still be connected to the purified water outlet of the second filter unit 3. The outlet of the third filter unit 15 is adapted to be connected to a water outlet means 16 for user use, for example the water outlet means 16 may be a tap type of mechanism.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The above embodiments are only a few embodiments of the present invention, and the embodiments of the present invention are described above, but the present invention is only used for the understanding of the present invention, and is not limited to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A water purification system, its characterized in that, water purification system includes:

a first filter unit;

2. The water purification system of claim 1, wherein the first wastewater return waterway is on-off enabled.

3. The water purification system of claim 1, further comprising: and the second wastewater backflow waterway is provided with a third flow limiting unit, one end of the second wastewater backflow waterway is communicated with the inlet of the first filtering unit, and the other end of the second wastewater backflow waterway is communicated with the wastewater outlet of the second filtering unit.

4. The water purification system of claim 3, wherein the other end of the second wastewater return waterway is connected to the wastewater outlet of the second filter unit;

5. The water purification system of claim 3, further comprising:

6. The water purification system of claim 5, wherein the first wastewater return waterway is on-off; the water purification system at least has two states, in the first state, the purified water outlet of the second filtering unit and the inlet of the first filtering unit are in a communicated state through the first purified water backflow waterway, the waste water outlet of the second filtering unit and the raw water inlet of the second filtering unit are in a communicated state through the first waste water backflow waterway, and the supercharging device is in an open state;

7. The water purification system of claim 6, wherein in the second state, the purified water outlet of the second filter unit and the inlet of the first filter unit are in communication via the first purified water return waterway.

8. The water purification system of claim 5 or 6, further comprising:

9. The water purification system of claim 8, wherein in the second state, the purified water outlet of the second filter unit and the inlet of the first filter unit are in a disconnected state by the first purified water return waterway.

10. The water purification system of claim 5, wherein the first purified water return circuit is provided with a first open/close valve and a first check valve communicated from the purified water outlet of the second filter unit to the inlet of the first filter unit.

11. The water purification system of claim 1, wherein the first wastewater return water path is provided with a second check valve communicated from the wastewater outlet of the second filter unit to the raw water inlet of the second filter unit.

12. The water purification system of claim 3, wherein the third flow restricting unit comprises a flow restricting orifice structure.

13. The water purification system of claim 3, wherein the second wastewater return pathway is provided with a third one-way valve communicating from the wastewater outlet of the second filter unit to the inlet of the first filter unit.

14. The water purification system of claim 8, wherein the fourth flow restricting unit comprises a flow restricting orifice structure.

15. The water purification system of claim 14, wherein a fourth check valve is disposed on the second purified water return water path and is communicated from the purified water outlet of the second filter unit to the raw water inlet of the second filter unit.

16. The water purification system of claim 6, wherein the pressure boosting device is connected between the outlet of the first filter unit and the raw water inlet of the second filter unit, and both ends of the first wastewater return waterway are respectively connected with the wastewater outlet of the second filter unit and the inlet of the pressure boosting device;

the water purification system still includes:

17. The water purification system of claim 8, wherein the pressure boosting device is connected to the downstream of the purified water outlet of the second filter unit, and the two ends of the first purified water return waterway are respectively connected to the downstream of the pressure boosting device and the inlet of the first filter unit;

the water purification system still includes:

18. The water purification system of claim 8, further comprising:

19. The water purification system of claim 18, wherein the third filter unit comprises a post-filter cartridge.

20. The water purification system of claim 1, wherein the first filter unit comprises a pre-filter cartridge.

21. The water purification system of claim 1, wherein the second filter unit comprises at least one of: a reverse osmosis membrane filter core and a nanofiltration membrane filter core.

22. The water purification system of claim 1, wherein the first flow restricting unit comprises a flow restricting orifice structure; and/or the second flow restricting unit comprises a flow restricting orifice structure.

23. The water purification system of claim 1, wherein the wastewater discharge channel is provided with a first water channel and a second water channel which are connected in parallel, the first water channel is provided with a third opening and closing valve, the second flow limiting unit is positioned in the second water channel, and the second water channel is further provided with a fourth opening and closing unit.