Water purifier

Abstract

The utility model provides a water purifier which is characterized in that a first valve is arranged on a first water outlet channel, a water inlet of the first water outlet channel is communicated with a water outlet of a filter element, and a water outlet of the first water outlet channel is communicated with an upstream port of a filter screen assembly; the second valve is arranged on the second water outlet channel, a water inlet of the second water outlet channel is communicated with a water outlet of the filter element, and a water outlet of the second water outlet channel is communicated with a downstream port of the filter screen assembly; the third valve is arranged on the second wastewater channel, a water inlet of the second wastewater channel is communicated with an upstream port of the filter screen assembly, and a water outlet of the first wastewater channel is communicated with a water outlet of the second wastewater channel; the upstream port of the filter screen assembly and the downstream port of the filter screen assembly are located on the two sides of the filter screen in the water flow direction respectively. According to the utility model, the filter screen is cleaned in a manner of backwashing the filter screen by water flow, the water flow blockage at the filter screen can be effectively prevented under the condition that the mesh number of the filter screen is not reduced, and the water outlet flow is ensured while the filtering quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water purification, especially relates to a water purifier. BACKGROUND

[0002] In the existing water purifier, due to the problems such as filter core structure first flushing or filter core leakage after long time use, it can cause the pollution of the back end water outlet, and the particle impurities in the filter core affect the daily use experience of the user. Therefore, in the existing water purifier structure, a filter screen is generally arranged at the water outlet end behind the filter core to block the impurities. However, after the filter screen is blocked, the water flow will be affected, and more seriously, the function and service life of the subsequent components will be affected. In the existing structure, in order to prevent the filter screen from being blocked and affecting the service life of the subsequent components and the water quantity in the waterway, the mesh number of the filter screen is usually reduced to achieve the purpose, but the mesh number of the filter screen will reduce the filtering quality. SUMMARY

[0003] The utility model wants to solve the technical problem that the existing technology reduces the water flow blockage by reducing the mesh number of the filter screen, which leads to the defect of reducing the filtering quality, and provides a water purifier.

[0004] The utility model solves the above technical problem through the following technical scheme:

[0005] A water purifier, the water purifier includes a filter core, a filter screen assembly, a first valve, a second valve, a third valve, a water inlet channel, a first water outlet channel, a second water outlet channel, a first waste water channel and a second waste water channel;

[0006] The water outlet of the water inlet channel is connected and communicated with the water inlet of the filter core, and the water inlet of the first waste water channel is connected and communicated with the waste water outlet of the filter core;

[0007] The first valve is arranged on the first water outlet channel, the water inlet of the first water outlet channel is connected and communicated with the water outlet of the filter core, and the water outlet of the first water outlet channel is connected and communicated with the upstream port of the filter screen assembly;

[0008] The second valve is arranged on the second water outlet channel, the water inlet of the second water outlet channel is connected and communicated with the water outlet of the filter core, and the water outlet of the second water outlet channel is connected and communicated with the downstream port of the filter screen assembly;

[0009] The third valve is arranged on the second waste water channel, the water inlet of the second waste water channel is connected and communicated with the upstream port of the filter screen assembly, and the water outlet of the first waste water channel and the water outlet of the second waste water channel are connected and communicated;

[0010] The filter screen assembly comprises a filter screen, and an upstream port of the filter screen assembly and a downstream port of the filter screen assembly are respectively located on two sides of the filter screen in the water flow direction.

[0011] In the present scheme, when the user normally uses water, the first valve is always open, and the second valve and the third valve are always closed. The water filtered by the filter element flows into the first water outlet channel. The water filtered by the filter screen flows from the upstream to the downstream of the filter screen assembly, and then flows to the water use end of the water purifier. When it is necessary to continue to backwash the filter screen, the first valve is always closed, and the second valve and the third valve are always open. The water filtered by the filter element flows into the second water outlet channel, and flows reversely from the downstream to the upstream of the filter screen assembly to flush the filter screen. The waste water generated by the flushing is discharged through the second waste water channel. The present scheme realizes the cleaning of the filter screen by reversing the water flow to wash the filter screen. The water flow blockage at the filter screen can be effectively prevented without reducing the mesh number of the filter screen. The filtering quality and the water outlet flow are ensured.

[0012] Preferably, the first valve, the second valve and the third valve are all solenoid valves, and the water purifier further comprises a control unit configured to control the closing state of the first valve to be opposite to the closing state of the second valve and the third valve.

[0013] In the present scheme, the electrically driven mode can save labor cost. The solenoid valve has fast response speed, high control precision and high reliability. The closing state of the first valve is opposite to the closing state of the second valve and the third valve to guide the water flow direction and prevent the waste water generated after washing the filter screen from flowing into the filter element through the first water outlet channel.

[0014] Preferably, the water purifier further comprises a first check valve arranged on the second water outlet channel, the first check valve is arranged upstream of the second valve, and a water outlet of the first check valve is in communication with a water inlet of the second valve.

[0015] Preferably, the water purifier further comprises a second check valve arranged on the second waste water channel, the second check valve is arranged upstream of the third valve, and a water outlet of the second check valve is in communication with a water inlet of the third valve.

[0016] In the present scheme, the first check valve and the second check valve are used to prevent water flow backflow, guide the water flow direction, and ensure that the waste water generated after washing the filter screen can be smoothly discharged without polluting other channels.

[0017] Preferably, the water purifier further comprises a water valve assembly and a third water outlet channel, the water valve assembly is arranged on the third water outlet channel, and a water inlet of the third water outlet channel is connected and communicated with the downstream port of the filter screen assembly.

[0018] In the present solution, the water valve assembly is used to control the passage of the overall water path, open the water path when the user uses water, and close the water path when the user does not use water to prevent water leakage of the water purifier.

[0019] Preferably, the water purifier further comprises a flow meter, which is arranged on the third water outlet channel and located downstream of the water valve assembly.

[0020] In the present solution, the flow meter is used to count the water flow in the water path, facilitating the adjustment of the flushing water amount and frequency.

[0021] Preferably, the water purifier further comprises a drive pump, which is arranged on the third water outlet channel and located downstream of the flow meter.

[0022] In the present solution, the drive pump is used to provide water pressure to ensure smooth water outlet of the water purifier.

[0023] Preferably, the filter assembly further comprises a pipe body, the inside of the pipe body forms a water flow channel, the pipe body has a first water inlet, a second water inlet, a first water outlet and a second water outlet, the first water inlet of the pipe body is connected and communicated with the water outlet of the first water outlet channel, the second water inlet of the pipe body is connected and communicated with the water outlet of the second water outlet channel, the first water outlet is connected and communicated with the water inlet of the second waste water channel, and the second water outlet is connected and communicated with the water inlet of the third water outlet channel.

[0024] The filter screen is arranged in the inside of the pipe body, the first water inlet and the first water outlet are located on one side of the filter screen in the water flow direction, and the second water inlet and the second water outlet are located on the other side of the filter screen in the water flow direction.

[0025] In the present solution, the above arrangement makes the water flow in the water path of the water purifier pass through the filter screen whether it is normal water outlet or backwashing, so that the water flow can be subjected to secondary filtration by the filter screen during normal water outlet, and the filter screen can be washed during backwashing, reducing the accumulation of impurities on the filter screen.

[0026] Preferably, the pipe body comprises a first connecting section, a second connecting section and a third connecting section in sequence along the water flow direction, the filter screen is arranged in the second connecting section, the first water inlet and the first water outlet are arranged on the first connecting section, and the second water inlet and the second water outlet are arranged on the third connecting section.

[0027] The inner diameter of the second connecting section is smaller than the inner diameter of the first connecting section, and / or the inner diameter of the second connecting section is smaller than the inner diameter of the third connecting section.

[0028] In the scheme, the water pressure at the second connecting section is greater than the water pressure at the first connecting section and / or the third connecting section, so that the washing force of the water flow on the filter screen can be improved in the backwashing procedure, and the cleaning effect of impurities on the filter screen can be improved.

[0029] Preferably, the pipe body is a symmetrical structure.

[0030] In the scheme, the symmetrical pipe body is convenient to install and improves the installation efficiency.

[0031] Preferably, the axis of the second water inlet and the first water outlet is parallel to the vertical direction, the opening of the second water inlet is upward, and the opening of the first water outlet is downward.

[0032] In the scheme, the wastewater after washing the filter screen can flow under the action of gravity, and the driving force is reduced.

[0033] The utility model discloses a positive progress effect lies in: the utility model discloses a water flow backflushing filter screen mode realizes the cleaning of filter screen, can effectively prevent the water flow blockage at filter screen under the condition of not reducing the filter screen mesh number, guarantees the water flow when guaranteeing the filtration quality. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is the internal structure schematic view of water purifier of an embodiment of the utility model.

[0035] Figure 2 It is the three -dimensional structure schematic view of filter screen subassembly of an embodiment of the utility model.

[0036] Figure 3 It is the internal structure schematic view of filter screen subassembly of an embodiment of the utility model.

[0037] Figure 4 It is the working flow schematic view of water purifier of an embodiment of the utility model.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] Filter core 1

[0040] Filter screen subassembly 2

[0041] Filter screen 21

[0042] Pipe body 22

[0043] First connecting section 221

[0044] Second connecting section 222

[0045] Third connecting section 223

[0046] First water inlet 224

[0047] Second water inlet 225

[0048] First outlet 226

[0049] Second outlet 227

[0050] First transition section 228

[0051] Second transition section 229

[0052] Water valve assembly 31

[0053] Flow meter 32

[0054] Drive pump 33

[0055] Water inlet channel 41

[0056] First water outlet channel 42

[0057] Second water outlet channel 43

[0058] Third water outlet channel 44

[0059] First wastewater channel 45

[0060] Second wastewater channel 46

[0061] Water end 47

[0062] First valve 51

[0063] Second valve 52

[0064] Third valve 53

[0065] First check valve 54

[0066] Second check valve 55 Detailed Implementation

[0067] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0068] like Figure 1 As shown, this embodiment discloses a water purifier, including a filter element 1, a filter screen assembly 2, a water valve assembly 31, a drive pump 33, a water inlet channel 41, a first water outlet channel 42, a third water outlet channel 44, and a first wastewater channel 45.

[0069] like Figure 1As shown, the inlet of the water inlet channel 41 is connected to tap water, and the outlet of the water inlet channel 41 is connected to the inlet of the filter element 1. The inlet of the first wastewater channel 45 is connected to the wastewater outlet of the filter element 1. The inlet of the first outlet channel 42 is connected to the outlet of the filter element 1, and the outlet of the first outlet channel 42 is connected to the upstream port of the filter screen assembly 2. The inlet of the third outlet channel 44 is connected to the downstream port of the filter screen assembly 2, and the outlet of the third outlet channel 44 is connected to the water supply end 47 of the water purifier. The water valve assembly 31 and the drive pump 33 are both installed on the third outlet channel 44, with the drive pump 33 located downstream of the water valve assembly 31. The water valve assembly 31 controls the overall water circuit, opening the water circuit when the user uses water and closing it when the user does not use water to prevent leakage from the water purifier. The drive pump 33 provides water pressure to ensure smooth water output from the water purifier.

[0070] When the user uses water normally, the water valve assembly 31 is in the open state, and tap water flows into the filter element 1 through the inlet channel 41 for filtration. The filtered clean water flows into the first outlet channel 42, and after secondary filtration by the filter screen assembly 2, it flows into the third outlet channel 44. Then, it flows out from the water outlet 47 of the water purifier through the outlet of the third outlet channel 44 for the user's use. Wastewater filtered by the filter element 1 is discharged through the first wastewater channel 45.

[0071] It should be noted that in this embodiment, the upstream and downstream of the filter assembly 2 and the downstream of the water valve assembly 31 are divided according to the upstream and downstream direction of the water flow when the user uses water normally.

[0072] In this embodiment, the drive pump 33 is a DC pump. In other alternative embodiments, the drive pump 33 may also adopt other drive structures that can achieve the above functions.

[0073] Furthermore, such as Figure 1 As shown, the water purifier also includes a first valve 51, a second valve 52, a third valve 53, a first check valve 54, a second check valve 55, a second water outlet channel 43, and a second wastewater channel 46.

[0074] like Figure 1As shown, the water inlet of the second water outlet channel 43 is connected and communicated with the water outlet of the filter core 1, and the water outlet of the second water outlet channel 43 is connected and communicated with the downstream port of the filter screen assembly 2. The water inlet of the second waste water channel 46 is connected and communicated with the upstream port of the filter screen assembly 2, and the water outlet of the first waste water channel 45 and the water outlet of the second waste water channel 46 are connected and communicated. The first valve 51 is arranged on the first water outlet channel 42, the second valve 52 and the first one-way valve 54 are arranged on the second water outlet channel 43, and the third valve 53 and the second one-way valve 55 are arranged on the second waste water channel 46. The first one-way valve 54 is arranged upstream of the second valve 52, and the water outlet of the first one-way valve 54 is communicated with the water inlet of the second valve 52. The second one-way valve 55 is arranged upstream of the third valve 53, and the water outlet of the second one-way valve 55 is communicated with the water inlet of the third valve 53.

[0075] It should be noted that the upstream of the second valve 52 and the upstream of the third valve 53 in the embodiment are divided according to the upstream and downstream of the water flow direction after the water purifier enters the backwashing program.

[0076] As shown in Figures 1-3 , the filter screen assembly 2 includes a filter screen 21 and a pipe body 22, the filter screen 21 is arranged inside the pipe body 22, and the upstream port of the filter screen assembly 2 and the downstream port of the filter screen assembly 2 are located on both sides of the filter screen 21 in the water flow direction.

[0077] Specifically, as shown in Figure 2 and Figure 3 , the inside of the pipe body 22 forms a water flow channel, the pipe body 22 includes a first connecting section 221, a second connecting section 222 and a third connecting section 223 in sequence along the water flow direction, the filter screen 21 is arranged in the second connecting section 222, and the first connecting section 221 forms the upstream end of the filter screen assembly 2 at the end away from the second connecting section 222 in the water flow direction. The third connecting section 223 forms the downstream end of the filter screen assembly 2 at the end away from the second connecting section 222 in the water flow direction.

[0078] As shown in Figure 2 and Figure 3 , the pipe body 22 has a first water inlet 224, a second water inlet 225, a first water outlet 226 and a second water outlet 227, the first water inlet 224 and the first water outlet 226 are arranged on the first connecting section 221, and the second water inlet 225 and the second water outlet 227 are arranged on the third connecting section 223. The first water inlet 224 of the pipe body 22 is connected and communicated with the water outlet of the first water outlet channel 42, the second water inlet 225 of the pipe body 22 is connected and communicated with the water outlet of the second water outlet channel 43, the first water outlet 226 is connected and communicated with the water inlet of the second waste water channel 46, and the second water outlet 227 is connected and communicated with the water inlet of the third water outlet channel 44.

[0079] In the embodiment, no matter whether the water purifier is in normal water output or backwashing, the water flow in the water path will pass through the filter screen 21, so that the water flow can be secondarily filtered by the filter screen 21 in normal water output, and the water flow can flush the filter screen 21 to reduce the impurities accumulated on the filter screen 21 in backwashing.

[0080] Specifically, when the user normally uses water, the first valve 51 is always open, the second valve 52 and the third valve 53 are always closed, and the water filtered by the filter element 1 flows into the first water outlet channel 42, and is filtered by the filter screen 21 from upstream to downstream of the filter screen assembly 2, and then flows to the water use end 47 of the water purifier. When it is needed to continue backwashing the filter screen 21, the first valve 51 is always closed, the second valve 52 and the third valve 53 are always open, and the water filtered by the filter element 1 flows into the second water outlet channel 43, and reversely flows from downstream to upstream of the filter screen assembly 2 to flush the filter screen 21, and the waste water generated by the flushing is discharged through the second waste water channel 46.

[0081] In the embodiment, when the user normally uses water, the impurities filtered by the filter screen 21 are accumulated on one side of the filter screen 21 facing the first connecting section 221, so that in the backwashing program of the water purifier, the water flow reversely flows from the third connecting section 223 to the first connecting section 221, which can flush the impurities accumulated on the filter screen 21 to clean the filter screen 21, so that the water flow blockage at the filter screen 21 can be effectively prevented without reducing the mesh number of the filter screen 21, and the water flow rate is ensured while the filtering quality is ensured.

[0082] The first one-way valve 54 and the second one-way valve 55 are used to prevent the water flow from flowing back, to guide the water flow, and to ensure that the waste water generated after flushing the filter screen 21 can be smoothly discharged without polluting other channels.

[0083] In other alternative embodiments, the first one-way valve 54 can also not be arranged on the second water outlet channel 43, and / or the second one-way valve 55 can also not be arranged on the second waste water channel 46.

[0084] Further, the first valve 51, the second valve 52 and the third valve 53 in the embodiment are all solenoid valves, and the water purifier further comprises a control unit, which is used to control the closing state of the first valve 51 to be opposite to the closing state of the second valve 52 and the third valve 53, that is, when the first valve 51 is open, the second valve 52 and the third valve 53 are closed; when the first valve 51 is closed, the second valve 52 and the third valve 53 are open. The electric driving mode can save labor cost, and the solenoid valve has fast response speed, high control precision and high reliability. The closing state of the first valve 51 is opposite to the closing state of the second valve 52 and the third valve 53 to guide the water flow, and to prevent the waste water generated after flushing the filter screen 21 from flowing into the filter element 1 from the first water outlet channel 42.

[0085] Further, as shown in FIG. 6, the water purifier can further comprise a water level sensor 56 arranged on the water use end 47 of the water purifier, and the control unit is further used to control the first valve 51 to be closed and the second valve 52 and the third valve 53 to be opened when the water level sensor 56 detects that the water level of the water use end 47 is lower than a preset water level, and to control the first valve 51 to be opened and the second valve 52 and the third valve 53 to be closed when the water level sensor 56 detects that the water level of the water use end 47 is higher than the preset water level. Figure 3As shown, the inner diameter of the second connecting section 222 is smaller than that of the first connecting section 221, and the inner diameter of the second connecting section 222 is smaller than that of the third connecting section 223. The pipe body 22 further comprises a first transition section 228 and a second transition section 229, the first transition section 228 is connected between the first connecting section 221 and the second connecting section 222, and the second transition section 229 is connected between the third connecting section 223 and the second connecting section 222, the diameters of the first transition section 228 and the second transition section 229 gradually change from large to small, so as to realize the connection between the first transition section 228 and the second transition section 229 and between the third connecting section 223 and the second connecting section 222.

[0086] In other alternative embodiments, the first transition section 228 and the second transition section 229 can also not be designed, the diameters of the first connecting section 221, the second connecting section 222 and the third connecting section 223 are the same, or only one of the first connecting section 221 and the third connecting section 223 has an inner diameter larger than that of the second connecting section 222. In the embodiment, the inner diameter of the second connecting section 222 is designed to be smaller than that of the first connecting section 221 and the third connecting section 223, so as to increase the water pressure at the second connecting section 222 (i.e. the filter screen 21), so that the washing force of the water flow on the filter screen 21 can be improved in the backwashing program, and the cleaning effect of impurities on the filter screen 21 can be improved.

[0087] Further, as shown in Figure 1 The water purifier further comprises a flow meter 32, the flow meter 32 is arranged on the third water outlet channel 44, and the flow meter 32 is arranged downstream of the water valve assembly 31 and upstream of the driving pump 33. The flow meter 32 is used to count the water flow in the waterway, so as to facilitate the adjustment of the washing water amount and the number of times.

[0088] Further, as shown in Figure 2 In the embodiment, the pipe body 22 is of a symmetrical structure, and the symmetrical pipe body 22 facilitates installation and improves installation efficiency.

[0089] Further, as shown in Figure 2 and Figure 3 The axes of the second water inlet 225 and the first water outlet 226 are parallel to the vertical direction, the opening of the second water inlet 225 is upward, and the opening of the first water outlet 226 is downward. The waste water after washing the filter screen 21 can flow under the action of gravity, so as to reduce the driving force.

[0090] In other alternative embodiments, the axes of the second water inlet 225 and the first water outlet 226 can also be designed in other directions, for example, parallel to the horizontal plane.

[0091] As shown in Figure 4 According to the structure of the water purifier in the above embodiment, the working process of the water purifier is briefly described.

[0092] When the user uses water normally, the first valve 51 is always open, the second valve 52 and the third valve 53 are closed, and the filtered water after the filter core 1 is filtered passes through the first valve 51 and then passes through the filter screen 21 for secondary filtration, and then flows out from the water outlet 47 of the water purifier to form pure water.

[0093] When the water purifier starts the backwashing program, the first valve 51 is closed, the second valve 52 and the third valve 53 are opened, and the filtered water after the filter core 1 is filtered flows from the downstream of the filter screen assembly 2 to the upstream of the filter screen assembly 2 through the second valve 52 to clean the impurities accumulated on the filter screen 21.

[0094] Further, the scenarios in which the backwashing program is used include:

[0095] First, after the filter core 1 is flushed and normal water is discharged, the backwashing is performed to prevent the impurities flushed from the filter core 1 for the first time from being blocked in front of the filter screen 21.

[0096] Second, when the filter core 1 is used for a period of time or the water flow rate of the water outlet 47 reaches a certain value, the automatic backwashing program is started.

[0097] Third, when the filter core 1 is used for more than a certain period of time or flow rate, the frequency of backwashing is increased.

[0098] Further, the flushing stage is controlled by a position PID algorithm, specifically:

[0099] U(t) = Kp*e(t) + Ki*Σe(t) + Kd*( e(t) - e(t-1))

[0100] e(t) is the difference between the water flow rate of the flow meter 32 and the water flow rate of the next stage, that is, the target value minus the actual value;

[0101] e(t-1) is the flow rate difference calculated after the last detection;

[0102] Kp, Ki, and Kd are set coefficients, which are set according to the water hardness and other conditions in different regions.

[0103] When the flow rate used by the flow meter 32 exceeds the set value, the set coefficients Kp, Ki, and Kd can be modified to increase the frequency of backwashing.

[0104] In the description of the utility model, need understanding is, the term "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and so on indicate the orientation or positional relationship is based on the orientation or positional relationship of the device or assembly shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or assembly indicated must have a particular orientation, with a particular orientation structure and operation, therefore can not be understood as the restriction of the utility model.

[0105] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only illustrative, the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, but these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A water purifier, characterized in that, The water purifier includes a filter element, a filter screen assembly, a first valve, a second valve, a third valve, a water inlet channel, a first water outlet channel, a second water outlet channel, a first wastewater channel, and a second wastewater channel; The outlet of the water inlet channel is connected to and communicates with the inlet of the filter element, and the inlet of the first wastewater channel is connected to and communicates with the wastewater outlet of the filter element. The first valve is installed on the first water outlet channel, the inlet of the first water outlet channel is connected and communicates with the outlet of the filter element, and the outlet of the first water outlet channel is connected and communicates with the upstream port of the filter screen assembly. The second valve is installed on the second water outlet channel. The inlet of the second water outlet channel is connected to and communicates with the outlet of the filter element. The outlet of the second water outlet channel is connected to and communicates with the downstream port of the filter screen assembly. The third valve is installed on the second wastewater channel. The inlet of the second wastewater channel is connected to and communicates with the upstream port of the filter assembly. The outlet of the first wastewater channel is connected to and communicates with the outlet of the second wastewater channel. The filter assembly includes a filter screen, with its upstream port and downstream port located on opposite sides of the filter screen in the direction of water flow.

2. The water purifier as described in claim 1, characterized in that, The first valve, the second valve, and the third valve are all solenoid valves. The water purifier also includes a control unit, which controls the closing state of the first valve to be opposite to the closing state of the second valve and the third valve.

3. The water purifier as described in claim 1, characterized in that, The water purifier also includes a first one-way valve, which is disposed on the second water outlet channel. The first one-way valve is located upstream of the second valve, and the outlet of the first one-way valve is connected to the inlet of the second valve. And / or, the water purifier further includes a second one-way valve, which is disposed on the second wastewater channel, located upstream of the third valve, and the outlet of the second one-way valve is connected to the inlet of the third valve.

4. The water purifier as described in claim 1, characterized in that, The water purifier also includes a water valve assembly and a third water outlet channel. The water valve assembly is disposed on the third water outlet channel, and the inlet of the third water outlet channel is connected and communicates with the downstream port of the filter assembly.

5. The water purifier as described in claim 4, characterized in that, The water purifier also includes a flow meter, which is installed on the third water outlet channel and located downstream of the water valve assembly.

6. The water purifier as described in claim 5, characterized in that, The water purifier also includes a drive pump, which is located on the third water outlet channel and downstream of the flow meter.

7. The water purifier as described in any one of claims 1-6, characterized in that, The filter assembly also includes a tube body, the inside of which a water flow channel is formed. The tube body has a first inlet, a second inlet, a first outlet, and a second outlet. The first inlet of the tube body is connected to and communicates with the outlet of the first outlet channel. The second inlet of the tube body is connected to and communicates with the outlet of the second outlet channel. The first outlet is connected to and communicates with the inlet of the second wastewater channel. The second outlet is connected to and communicates with the inlet of the third outlet channel. The filter screen is located inside the pipe body. The first inlet and the first outlet are located on one side of the filter screen in the direction of water flow, and the second inlet and the second outlet are located on the other side of the filter screen in the direction of water flow.

8. The water purifier as described in claim 7, characterized in that, The pipe body includes a first connecting section, a second connecting section and a third connecting section in sequence along the water flow direction. The filter screen is disposed in the second connecting section. The first water inlet and the first water outlet are disposed on the first connecting section, and the second water inlet and the second water outlet are disposed on the third connecting section. The inner diameter of the second connecting segment is smaller than the inner diameter of the first connecting segment, and / or the inner diameter of the second connecting segment is smaller than the inner diameter of the third connecting segment.

9. The water purifier as described in claim 8, characterized in that, The tube has a symmetrical structure.

10. The water purifier as described in claim 9, characterized in that, The axes of the second inlet and the first outlet are parallel to the vertical direction, with the opening of the second inlet facing upwards and the opening of the first outlet facing downwards.

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