Water purification system

Abstract

The utility model discloses a water purification system relates to water supply field, the water purification system includes: water inlet port, water outlet port of water purification, at least one first filter unit, the import of first filter unit can communicate with water inlet port, the water purification export of first filter unit can communicate with water outlet port of water purification, at least one second filter unit, the import of second filter unit can communicate with water inlet port, the wastewater export of first filter unit respectively, the water purification export of second filter unit can communicate with water outlet port of water purification. The application can solve the problem of the rapid attenuation of the second filter unit under high hardness water quality.

Description

Technical Field

[0001] This utility model relates to the field of water supply, and in particular to a water purification system. Background Technology

[0002] In large-scale water treatment systems, increasing the purified water flow rate and the system's purified water recovery rate are core design objectives. To achieve this, the industry commonly adopts a multi-unit series fine filtration system configuration. Its core design logic is to connect the inlet of at least one second filtration unit to the wastewater outlet of at least one first filtration unit, allowing the substandard wastewater (concentrated water) discharged from the first filtration unit to enter the second filtration unit for secondary filtration. This connection method, through cascaded wastewater recovery, expands the effective purified water production path, significantly increasing the purified water flow rate per unit time; on the other hand, it reduces wastewater discharge, resulting in a substantial improvement in the system's purified water recovery rate, aligning with the industry trend of water conservation and efficient utilization.

[0003] However, the aforementioned conventional series process faces significant limitations in water quality adaptability in practical applications, especially in areas with high-hardness water, where system performance suffers severe degradation and fails to meet design expectations. Specifically, in the wastewater (concentrated water) of the first filtration unit, the concentration of pollutants increases significantly after initial interception, typically several times or even tens of times higher than that of the raw water. When this high-concentration wastewater enters the second filtration unit, it causes rapid performance degradation: on the one hand, the purified water flux decreases significantly, failing to maintain the designed purified water flow rate standard and affecting the overall system treatment efficiency; on the other hand, the membrane material of the filter unit ages rapidly, its filtration performance deteriorates irreversibly, and its service life is drastically shortened (usually only 30%-60% of that in conventional water quality scenarios). This not only increases the frequency of membrane replacement and maintenance, raising operating costs, but may also affect the continuous and stable operation of the water treatment system due to frequent downtime for maintenance.

[0004] The shortcomings of existing cascaded filtration unit technology in areas with high-hardness water have become a key technical bottleneck restricting the efficient and stable operation of large-scale water treatment systems. There is an urgent need for an optimized solution that can take into account water flow rate, recovery rate and water quality adaptability to solve the industry pain point of rapid degradation of the second filtration unit under high-hardness water conditions. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a water purification system that can solve the problem of rapid degradation of the second filter unit under high hardness water quality.

[0006] The specific technical solution of this utility model embodiment is as follows:

[0007] A water purification system, the water purification system comprising:

[0008] Water inlet port; purified water outlet port;

[0009] At least one first filter unit, wherein the inlet of the first filter unit is connected to the water inlet port, and the purified water outlet of the first filter unit is connected to the purified water outlet port.

[0010] At least one second filter unit, the inlet of which can be connected to the water inlet port and the wastewater outlet of the first filter unit, and the clean water outlet of the second filter unit can be connected to the clean water outlet port.

[0011] Preferably, the water purification system has a first working mode, in which the inlet of the second filter unit is connected to the wastewater outlet of the first filter unit, and the inlet of the second filter unit is disconnected from the water inlet port.

[0012] Preferably, the water purification system has a second working mode, in which the inlet of the second filter unit is connected to the water inlet port, and the inlet of the second filter unit is disconnected from the wastewater outlet of the first filter unit.

[0013] Preferably, the inlet of the second filtration unit and the wastewater outlet of the first filtration unit have a first control mechanism capable of enabling on / off switching.

[0014] In the first working mode, the first control mechanism is in a connected state;

[0015] In the second operating mode, the first control mechanism is in the disconnected state.

[0016] Preferably, a first check valve is provided between the inlet of the second filter unit and the wastewater outlet of the first filter unit;

[0017] In the first working mode, the first check valve can be opened from the wastewater outlet of the first filter unit to the inlet of the second filter unit;

[0018] In the second operating mode, the first check valve is in the off state.

[0019] Preferably, the wastewater outlet of the first filtration unit is connected to a first functional valve with wastewater ratio function and on / off function; the wastewater outlet of the second filtration unit is connected to a second functional valve with wastewater ratio function.

[0020] In the first working mode, the first functional valve is in the off state or the wastewater ratio function state, and the second functional valve is in the wastewater ratio function state.

[0021] In the second operating mode, the first functional valve is in the wastewater ratio function state, and the second functional valve is in the wastewater ratio function state.

[0022] Preferably, the wastewater outlet of the first filtration unit and the wastewater outlet of the second filtration unit are connected to a first functional valve with a wastewater ratio function.

[0023] In the first working mode, the first functional valve is in the wastewater ratio function state;

[0024] In the second operating mode, the first functional valve is in the wastewater ratio function state.

[0025] Preferably, the inlet of the second filter unit and the water inlet port have a second control mechanism that can realize the on / off function.

[0026] Preferably, the wastewater outlet of the second filtration unit can be connected to the inlet of the first filtration unit.

[0027] Preferably, the water purification system has a third working mode, in which the inlet of the second filter unit is connected to the water inlet port, the wastewater outlet of the second filter unit is connected to the inlet of the first filter unit, and the water inlet port is disconnected from the inlet of the first filter unit.

[0028] Preferably, a second check valve is provided between the wastewater outlet of the second filter unit and the inlet of the first filter unit, and the second check valve can be opened from the wastewater outlet of the second filter unit to the inlet of the first filter unit.

[0029] Preferably, a third control mechanism capable of switching on and off is provided between the wastewater outlet of the second filtration unit and the inlet of the first filtration unit.

[0030] Preferably, the water purification system includes: a fourth control mechanism for controlling the connection and disconnection between the water inlet port and the inlet of the first filter unit, and between the water inlet port and the inlet of the second filter unit;

[0031] The fourth control mechanism includes a switching valve, or the fourth control mechanism includes a first on / off valve located between the water inlet port and the inlet of the first filter unit and a second on / off valve located between the water inlet port and the inlet of the second filter unit.

[0032] Preferably, there are multiple first filter units, and the multiple first filter units are connected in parallel.

[0033] Preferably, there are multiple second filter units, and the multiple second filter units are connected in parallel.

[0034] Preferably, the water purification system includes:

[0035] A flow detection unit is used to detect the flow rate of purified water output from the purified water outlet port.

[0036] Preferably, the water purification system includes: a control unit, which is electrically connected to the flow detection unit, and the control unit controls the switching of the working mode of the water purification system based on the flow detection unit.

[0037] Preferably, the water purification system includes:

[0038] A water quality detection unit is used to detect the water quality of the raw water flowing in from the inlet port. The control unit is electrically connected to the water quality detection unit and controls the switching of the working mode of the water purification system based on the flow detection unit and the water quality detection unit.

[0039] Preferably, the water quality testing unit includes a TDS testing unit.

[0040] Preferably, the water purification system includes:

[0041] A filter unit life detection unit is electrically connected to the control unit and is used to detect the lifespan of the filter unit.

[0042] The control unit controls the water purification system based on the filter unit life detection unit, the flow detection unit, and the water quality detection unit.

[0043] Preferably, the control mechanism includes at least one of the following: an on / off valve and a switching valve.

[0044] The technical solution of this utility model has the following significant beneficial effects:

[0045] The water purification system of this application allows the inlet of the second filter unit to be connected to the water inlet port, while the inlet of the second filter unit is disconnected from the wastewater outlet of the first filter unit. This allows the second filter unit to directly filter the raw water, thereby reducing the rate of degradation of the second filter unit and extending its lifespan. Furthermore, the water purification system can also allow the inlet of the second filter unit to be connected to the wastewater outlet of the first filter unit, while the inlet of the second filter unit is disconnected from the water inlet port. Therefore, the water purification system can switch between these two states to balance the lifespan of the first and second filter units, ensuring that both the first and second filter units achieve their expected lifespans.

[0046] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0047] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0048] Figure 1 This is a schematic diagram of the water purification system in the first embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the water purification system in the second embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the water purification system in the third embodiment of this utility model;

[0051] Figure 4 This is a schematic diagram of the water purification system in the fourth embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of the water purification system in the fifth embodiment of this utility model.

[0053] The reference numerals in the above figures are as follows:

[0054] 1. Water inlet port; 2. Clean water outlet port; 3. First filter unit; 4. Second filter unit; 5. First check valve; 6. First functional valve; 7. Second functional valve; 8. First control mechanism; 9. Second check valve; 10. Second control mechanism; 11. Third control mechanism; 12. Fourth control mechanism; 13. Flow detection unit; 14. Water quality detection unit; 15. Boosting device. Detailed Implementation

[0055] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0056] To address the issue of rapid degradation of the second filtration unit in high-hardness water, this application proposes a water purification system. Figure 1 This is a schematic diagram of the water purification system in the first embodiment of the present invention, as shown below. Figure 1 As shown, the water purification system may include: a water inlet port 1; a purified water outlet port 2; at least one first filter unit 3, the inlet of the first filter unit 3 being able to communicate with the water inlet port 1, and the purified water outlet of the first filter unit 3 being able to communicate with the purified water outlet port 2; at least one second filter unit 4, the inlet of the second filter unit 4 being able to communicate with the water inlet port 1 and the wastewater outlet of the first filter unit 3 respectively, and the purified water outlet of the second filter unit 4 being able to communicate with the purified water outlet port 2.

[0057] The water purification system of this application allows the inlet of the second filter unit 4 to be connected to the water inlet port 1, while the inlet of the second filter unit 4 is disconnected from the wastewater outlet of the first filter unit 3. This allows the second filter unit 4 to directly filter the raw water, thereby reducing the rate of degradation of the second filter unit 4 and extending its lifespan. Furthermore, the water purification system can also allow the inlet of the second filter unit 4 to be connected to the wastewater outlet of the first filter unit 3, while the inlet of the second filter unit 4 is disconnected from the water inlet port 1. Therefore, the water purification system can switch between these two states to balance the lifespan of the first filter unit 3 and the second filter unit 4, ensuring that both the first filter unit 3 and the second filter unit 4 achieve their expected lifespans.

[0058] like Figure 1As shown, the water purification system includes: an inlet port 1; a purified water outlet port 2; at least one first filter unit 3; and at least one second filter unit 4. The inlet port 1 is used to connect to a water source to obtain raw water. The purified water outlet port 2 is used to output purified water to supply purified water to users. The first filter unit 3 is used to filter water to form purified water. During the filtration process, the first filter unit 3 discharges wastewater (also known as concentrated water) from the wastewater outlet. This application does not limit the specific type of the first filter unit 3, as long as it discharges wastewater from the wastewater outlet during filtration. The second filter unit 4 is used to filter water to form purified water. This application does not limit the specific type of the second filter unit 4. Further, the second filter unit 4 can be a filter unit that discharges wastewater from the wastewater outlet during the filtration process.

[0059] When there are multiple first filter units 3, the multiple first filter units 3 can be connected in parallel. Similarly, when there are multiple second filter units 4, the multiple second filter units 4 can be connected in parallel.

[0060] The inlet of the first filter unit 3 can be connected to the water inlet port 1, and the purified water outlet of the first filter unit 3 can be connected to the purified water outlet port 2. The inlet of the second filter unit 4 can be connected to both the water inlet port 1 and the wastewater outlet of the first filter unit 3, and the purified water outlet of the second filter unit 4 can be connected to the purified water outlet port 2. In this application, the connection and disconnection of the inlet of the first filter unit 3 with the water inlet port 1, the connection and disconnection of the purified water outlet of the first filter unit 3 with the purified water outlet port 2, the connection and disconnection of the inlet of the second filter unit 4 with both the water inlet port 1 and the wastewater outlet of the first filter unit 3, and the connection and disconnection of the purified water outlet of the second filter unit 4 with the purified water outlet port 2 can be achieved through various types of control mechanisms, without any limitation.

[0061] In one optional implementation, the water purification system may have a first operating mode. In this first operating mode, the inlet of the second filter unit 4 is connected to the wastewater outlet of the first filter unit 3, while the inlet of the second filter unit 4 is disconnected from the water inlet port 1. In this first operating mode, raw water enters the first filter unit 3 for filtration, and the resulting purified water is sent to the purified water outlet port 2. The resulting wastewater is sent to the inlet of the second filter unit 4. After being filtered by the second filter unit 4, the wastewater is discharged from the water purification system, such as into a sewer pipe, while the purified water from the second filter unit 4 is sent to the purified water outlet port 2.

[0062] In one optional implementation, the water purification system may have a second operating mode. In this second operating mode, the inlet of the second filter unit 4 is connected to the water inlet port 1, while the inlet of the second filter unit 4 is disconnected from the wastewater outlet of the first filter unit 3. In this second operating mode, raw water enters the first filter unit 3 for filtration, and the purified water is sent to the purified water outlet port 2, while the wastewater is discharged from the water purification system, such as into a sewer pipe. Alternatively, raw water may also enter the second filter unit 4 for filtration, and the purified water is sent to the purified water outlet port 2, while the wastewater is discharged from the water purification system.

[0063] In one feasible implementation, such as Figure 1 As shown, a first control mechanism 8 capable of switching on and off is provided between the inlet of the second filter unit 4 and the wastewater outlet of the first filter unit 3. In the first operating mode, the first control mechanism 8 is in a connected state; in the second operating mode, the first control mechanism 8 is in a disconnected state. For example, the first control mechanism 8 may include at least one of the following: an on / off valve, a switching valve, etc.

[0064] In another feasible implementation, Figure 2 This is a schematic diagram of the water purification system in the second embodiment of this utility model, as shown below. Figure 2 As shown, a first check valve 5 is provided between the inlet of the second filter unit 4 and the wastewater outlet of the first filter unit 3. In the first operating mode, the first check valve 5 allows flow from the wastewater outlet of the first filter unit 3 to the inlet of the second filter unit 4. In the second operating mode, the first check valve 5 is in the open state. The open state of the first check valve 5 can be understood as the valve core in the check valve being in a state of abutting the valve seat and not being pushed open and detached from the valve seat under fluid pressure. Since the inlet of the second filter unit 4 is connected to the inlet port 1 in the second operating mode, a large amount of raw water can be input into the inlet of the second filter unit 4. Because the first functional valve 6 is in the wastewater specific function state, the wastewater discharged from the wastewater outlet of the first filter unit 3 will be directly discharged from the water purification system and will basically not overcome the resistance of the first check valve 5 to flow to the inlet of the second filter unit 4.

[0065] In the above embodiments, the wastewater outlet of the first filtration unit 3 is connected to a first functional valve 6, which has both wastewater ratio and on / off functions; the wastewater outlet of the second filtration unit 4 is connected to a second functional valve 7, which has a wastewater ratio function. In the first operating mode, the first functional valve 6 is either in the off state or in the wastewater ratio function state, while the second functional valve 7 is in the wastewater ratio function state. When the first functional valve 6 is in the wastewater ratio function state, part of the wastewater output from the wastewater outlet of the first filtration unit 3 can flow to the inlet of the second filtration unit 4, and part can be discharged from the water purification system after passing through the first functional valve 6. In the second operating mode, both the first functional valve 6 and the second functional valve 7 are in the wastewater ratio function state.

[0066] In the above-described implementation methods Figure 5 This is a schematic diagram of the water purification system in the fifth embodiment of this utility model, as shown below. Figure 5 As shown, the wastewater outlet of the first filtration unit 3 is connected to a first functional valve 6, which has both wastewater ratio and on / off functions; the wastewater outlet of the second filtration unit 4 is connected to the inlet of the first functional valve 6. In both the first and second operating modes, the first functional valve 6 is in the wastewater ratio function state.

[0067] In one feasible implementation, such as Figure 1 and Figure 2 As shown, the second filter unit 4 has a second control mechanism 10 between its inlet and the water inlet port 1, which is capable of enabling on / off switching. For example, the second control mechanism 10 may include at least one of the following: an on / off valve, a switching valve, etc.

[0068] In one feasible implementation, Figure 3 This is a schematic diagram of the water purification system in the third embodiment of this utility model, as shown below. Figure 3 As shown, the wastewater outlet of the second filtration unit 4 can be connected to the inlet of the first filtration unit 3.

[0069] In this embodiment, as feasible, the water purification system may have a third working mode. In the third working mode, the inlet of the second filter unit 4 is connected to the water inlet port 1, the wastewater outlet of the second filter unit 4 is connected to the inlet of the first filter unit 3, and the water inlet port 1 is disconnected from the inlet of the first filter unit 3.

[0070] In this embodiment, in order to prevent the raw water from the inlet port 1 from being discharged directly into the water purification system through the downstream of the wastewater outlet of the second filter unit 4, a second one-way valve 9 is provided between the wastewater outlet of the second filter unit 4 and the inlet of the first filter unit 3. The second one-way valve 9 can be opened from the wastewater outlet of the second filter unit 4 to the inlet of the first filter unit 3.

[0071] In this embodiment, a third control mechanism 11 capable of switching on and off is provided between the wastewater outlet of the second filter unit 4 and the inlet of the first filter unit 3. For example, the third control mechanism 11 may include at least one of the following: an on / off valve, a switching valve, etc.

[0072] In this embodiment, such as Figure 3 As shown, the water purification system may include a fourth control mechanism 12 for controlling the on / off connection between the inlet port 1 and the inlet of the first filter unit 3, and between the inlet port 1 and the inlet of the second filter unit 4. In one feasible embodiment, the fourth control mechanism 12 may include a switching valve. In another feasible embodiment, the fourth control mechanism 12 may include a first on / off valve located between the inlet port 1 and the inlet of the first filter unit 3, and a second on / off valve located between the inlet port 1 and the inlet of the second filter unit 4.

[0073] In one feasible implementation, Figure 4 This is a schematic diagram of the water purification system in the fourth embodiment of this utility model, as shown below. Figure 3 and Figure 4 As shown, the water purification system may include: a flow detection unit 13, which detects the purified water flow rate output from the purified water outlet port 2. Based on the changes in the purified water flow rate detected by the flow detection unit 13, the water purification system switches its operating mode accordingly. Specifically, the water purification system may include: a control unit, which is electrically connected to the flow detection unit 13, and controls the switching of the water purification system's operating mode based on the flow detection unit 13.

[0074] For example, the water purification system can have a first state and a second state. In the first state, the water purification system can be in a first operating mode, and the purified water flow rate detected by the flow detection unit 13 at the purified water outlet port 2 exceeds a first preset value. In the second state, when the water purification system is in a second operating mode, the purified water flow rate detected by the flow detection unit 13 at the purified water outlet port 2 is lower than the first preset value.

[0075] like Figure 3 and Figure 4 As shown, the water purification system may include a water quality detection unit 14, which is used to detect the water quality of the raw water flowing in from the inlet port 1. A control unit is electrically connected to the water quality detection unit 14, and the control unit controls the switching of the water purification system's operating mode based on the flow detection unit 13 and the water quality detection unit 14. For example, the water quality detection unit 14 may include a TDS detection unit; of course, in other feasible embodiments, the water quality detection unit 14 may also be other types of detection units.

[0076] In the above embodiments, for example, in the first state, the water purification system is in a first operating mode. The purified water flow rate detected by the flow detection unit 13 at the purified water outlet port 2 exceeds a first preset value, and the water quality of the raw water flowing in from the inlet port 1 detected by the water quality detection unit 14 meets a first standard. At this time, it can be considered that the water purification system meets the regional inlet water quality preference, and the performance of the first filter unit 3 and the second filter unit 4 is good, allowing for a high purified water flow rate. In the second state, the water purification system is in a second operating mode. The purified water flow rate detected by the flow detection unit 13 at the purified water outlet port 2 is lower than the first preset value, and the water quality of the raw water flowing in from the inlet port 1 detected by the water quality detection unit 14 meets the first standard. At this time, it can be considered that the water purification system meets the regional inlet water quality preference, but the performance of the second filter unit 4 has decreased to a certain extent. Therefore, the raw water input from the inlet port 1 is directly fed into the second filter unit 4, thereby reducing the rate of performance degradation of the second filter unit 4. In this embodiment, as feasible, in the second state, the remaining lifespan of the first filter unit 3 and the second filter unit 4 is greater than a preset lifespan value. This ensures that the performance degradation of the second filter unit 4 is due to poor water quality in the area where the water purification system is located, ultimately resulting in a lower-than-preset flow rate of purified water output port 2. It also eliminates false alarms caused by improper installation leading to partial blockage of the water path, which could also cause the flow rate to be lower than the first preset value. Correspondingly, the water purification system may include a filter unit lifespan detection unit, electrically connected to the control unit, used to detect the lifespan of the filter units. The control unit controls the water purification system based on the filter unit lifespan detection unit, flow rate detection unit 13, and water quality detection unit 14. The filter unit lifespan detection unit can use methods such as calculating the usage time of the filter units or calculating the total amount of purified water output by the filter units.

[0077] Furthermore, the water purification system can have a third state and a fourth state. In the third state, the water purification system is in the first working mode. The water quality of the raw water flowing in from the inlet port 1, as detected by the water quality detection unit 14, is lower than the first standard, and the purified water flow rate output from the purified water outlet port 2, as detected by the flow detection unit 13, exceeds the second preset value. At this time, it can be considered that the water purification system is in a state of regional water quality deviation, but the performance of the first filter unit 3 and the second filter unit 4 is good, and a high purified water flow rate can be output. In the fourth state, the water purification system is in the second working mode. The water quality of the raw water flowing in from the inlet port 1, as detected by the water quality detection unit 14, is lower than the first standard, and the purified water flow rate output from the purified water outlet port 2, as detected by the flow detection unit 13, is lower than the second preset value. At this time, it can be considered that the water purification system is in a state of regional water quality deviation, but the performance of the second filter unit 4 has deteriorated to a certain extent. Therefore, the raw water input from the inlet port 1 is directly fed into the second filter unit 4, thereby reducing the rate of performance degradation of the second filter unit 4.

[0078] In all the above embodiments, as feasible, such as Figure 3 and Figure 4 As shown, the water purification system may include a booster device 15, which may be connected upstream of the inlet of the first filter unit 3 and the inlet of the second filter unit 4, thereby increasing the inlet water pressure and thus improving the water purification rate of the first filter unit 3 and the second filter unit 4.

[0079] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple 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 can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A water purification system, characterized in that, The water purification system includes: Water inlet port; purified water outlet port; At least one first filter unit, wherein the inlet of the first filter unit is connected to the water inlet port, and the purified water outlet of the first filter unit is connected to the purified water outlet port. At least one second filter unit, the inlet of which can be connected to the water inlet port and the wastewater outlet of the first filter unit, and the clean water outlet of the second filter unit can be connected to the clean water outlet port.

2. The water purification system according to claim 1, characterized in that, The water purification system has a first working mode. In the first working mode, the inlet of the second filter unit is connected to the wastewater outlet of the first filter unit, and the inlet of the second filter unit is disconnected from the water inlet port.

3. The water purification system according to claim 2, characterized in that, The water purification system has a second working mode. In the second working mode, the inlet of the second filter unit is connected to the water inlet port, and the inlet of the second filter unit is disconnected from the wastewater outlet of the first filter unit.

4. The water purification system according to claim 3, characterized in that, The inlet of the second filtration unit and the wastewater outlet of the first filtration unit have a first control mechanism that can realize the on / off function. In the first working mode, the first control mechanism is in a connected state; In the second operating mode, the first control mechanism is in the disconnected state.

5. The water purification system according to claim 3, characterized in that, A first check valve is provided between the inlet of the second filtration unit and the wastewater outlet of the first filtration unit; In the first working mode, the first check valve can be opened from the wastewater outlet of the first filter unit to the inlet of the second filter unit; In the second operating mode, the first check valve is in the off state.

6. The water purification system according to claim 4 or 5, characterized in that, The wastewater outlet of the first filtration unit is connected to a first functional valve with wastewater ratio function and on / off function; the wastewater outlet of the second filtration unit is connected to a second functional valve with wastewater ratio function. In the first working mode, the first functional valve is in the off state or the wastewater ratio function state, and the second functional valve is in the wastewater ratio function state. In the second operating mode, the first functional valve is in the wastewater ratio function state, and the second functional valve is in the wastewater ratio function state.

7. The water purification system according to claim 4 or 5, characterized in that, The wastewater outlets of the first filtration unit and the second filtration unit are connected to a first functional valve with a wastewater ratio function. In the first working mode, the first functional valve is in the wastewater ratio function state; In the second operating mode, the first functional valve is in the wastewater ratio function state.

8. The water purification system according to claim 3, characterized in that, The second filter unit has a second control mechanism between its inlet and the water inlet port, which enables the on / off function.

9. The water purification system according to claim 2, characterized in that, The wastewater outlet of the second filtration unit can be connected to the inlet of the first filtration unit.

10. The water purification system according to claim 9, characterized in that, The water purification system has a third working mode. In the third working mode, the inlet of the second filter unit is connected to the water inlet port, the wastewater outlet of the second filter unit is connected to the inlet of the first filter unit, and the water inlet port is disconnected from the inlet of the first filter unit.

11. The water purification system according to claim 9, characterized in that, A second check valve is provided between the wastewater outlet of the second filter unit and the inlet of the first filter unit. The second check valve can be opened from the wastewater outlet of the second filter unit to the inlet of the first filter unit.

12. The water purification system according to claim 9, characterized in that, A third control mechanism capable of switching on and off is provided between the wastewater outlet of the second filtration unit and the inlet of the first filtration unit.

13. The water purification system according to claim 10, characterized in that, The water purification system includes a fourth control mechanism for controlling the connection and disconnection between the water inlet port and the inlet of the first filter unit, and between the water inlet port and the inlet of the second filter unit. The fourth control mechanism includes a switching valve, or the fourth control mechanism includes a first on / off valve located between the water inlet port and the inlet of the first filter unit and a second on / off valve located between the water inlet port and the inlet of the second filter unit.

14. The water purification system according to claim 1, characterized in that, There are multiple first filter units, and the multiple first filter units are connected in parallel.

15. The water purification system according to claim 1, characterized in that, There are multiple second filter units, and the multiple second filter units are connected in parallel.

16. The water purification system according to claim 3, characterized in that, The water purification system includes: A flow detection unit is used to detect the flow rate of purified water output from the purified water outlet port.

17. The water purification system according to claim 16, characterized in that, The water purification system includes a control unit, which is electrically connected to the flow detection unit. The control unit controls the switching of the working mode of the water purification system based on the flow detection unit.

18. The water purification system according to claim 17, characterized in that, The water purification system includes: A water quality detection unit is used to detect the water quality of the raw water flowing in from the inlet port. The control unit is electrically connected to the water quality detection unit and controls the switching of the working mode of the water purification system based on the flow detection unit and the water quality detection unit.

19. The water purification system according to claim 18, characterized in that, The water quality testing unit includes a TDS testing unit.

20. The water purification system according to claim 18, characterized in that, The water purification system includes: A filter unit life detection unit is electrically connected to the control unit and is used to detect the lifespan of the filter unit. The control unit controls the water purification system based on the filter unit life detection unit, the flow detection unit, and the water quality detection unit.

21. The water purification system according to claim 4, 8, or 12, characterized in that, The control mechanism includes at least one of the following: on / off valve, switching valve.

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