Water purifier reversing valve and water purifier

Abstract

The invention relates to the technical field of water purifiers, in particular to a water purifier reversing valve and a water purifier.The water purifier reversing valve comprises a front filter, rear filters, a pure water tank, a concentrated water tank and a waste water tank, the rear filters are divided into the first rear filter and the second rear filter, and the front filter is communicated with the concentrated water tank through a pipeline; the concentrated water tank and the waste water tank are communicated with a first rear filter and a second rear filter through pipelines, the first rear filter and the second rear filter are connected with a pure water tank through pipelines, a fourth valve is arranged on the connecting pipeline, a pressure supply pump is connected to the front filter, and a first backflushing pump is arranged on the side, located on the pure water tank, of the first rear filter and the second rear filter. And a backflushing pump II is connected between the wastewater tank and the front filter. According to the water purifier, backwashing wastewater is recycled by using the internal filter, and then the used wastewater is used for continuously backwashing the front filter, so that the recycling rate of the wastewater is increased, and the use cost of the water purifier is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water purifiers, and specifically relates to a reversing valve for a water purifier and a water purifier. Background Art

[0002] An internal reverse osmosis membrane is provided in a reverse osmosis water purifier, and tap water can be directly converted into ultrapure water through reverse osmosis technology.

[0003] During the use of a reverse osmosis water purifier, in order to reduce the blockage of reverse osmosis, a pre-filter is usually provided to pre-filter the water source. The pre-filter usually mainly consists of a quartz sand filter and an activated carbon filter. Whether it is the reverse osmosis membrane or the pre-filter, after being used for a set time, backwashing treatment needs to be carried out to avoid the filter being blocked and unable to carry out the water purification work. However, when the reverse osmosis filter is backwashed, the water filtered by the pre-filter is usually used for backwashing, and when the reverse osmosis filter is washed, a large amount of water resources are consumed, which will increase the use cost of the water purifier. Therefore, in order to reduce the use cost of the water purifier, the utility model with the application number CN201922163236.8 provides a water-saving reverse osmosis membrane water purification system. This water purification system collects the backwash wastewater of the reverse osmosis filter and uses this wastewater to backwash the pre-filter, so as to improve the utilization rate of water resources and reduce the use cost of the water purifier. However, the wastewater generated by reverse osmosis has few impurities, so directly carrying out backwashing will still cause waste of water resources.

[0004] Therefore, in order to reduce the use cost of the water purifier, a reversing valve for a water purifier and a water purifier are proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a reversing valve for a water purifier and a water purifier. In order to reduce the use cost of the water purifier, the backwash wastewater of the reverse osmosis filter is recycled by using an internal reverse osmosis filter, so as to improve the recycling rate of the wastewater, reduce the loss of water resources, and solve the problem of reducing the use cost of the water purifier.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A water purifier, comprising a pre-filter, a post-filter, a pure water tank, a concentrated water tank, and a waste water tank. The post-filter is divided into a post-filter one and a post-filter two. The pre-filter is connected to the concentrated water tank through a pipeline. The concentrated water tank and the waste water tank are connected to the post-filter one and the post-filter two through pipelines. The post-filter one and the post-filter two are connected to the pure water tank through a pipeline, and a valve four is provided on the connecting pipeline. A pressure supply pump is connected to the pre-filter. A backwash pump one is provided on one side of the pure water tank where the post-filter one and the post-filter two are located. A backwash pump two is connected between the waste water tank and the pre-filter. A valve one is provided at the connecting pipeline between the pre-filter and the concentrated water tank. A valve two is provided at the connecting pipeline between the concentrated water tank and the post-filter. A valve three is provided at the connecting pipeline between the concentrated water tank and the post-filter two. The waste water tank is connected to the post-filter one and the post-filter two through a reversing valve. An air supply device is connected to the waste water tank. A liquid supply tank is connected to the reversing valve, and a flocculant is stored inside the liquid supply tank.

[0008] Through the setting of the waste water tank, during the backwashing process, the backwashing waste water can be collected. Then, through the switching of the reversing valve, the post-filter can re-filter the backwashing waste water, and then the filtered water is used to backwash the pre-filter, thereby effectively reducing the utilization rate of water resources and lowering the water purification cost. The setting of the liquid supply tank can provide flocculant into the waste water tank, so that the impurities in the waste water generated by the backwashing of the post-filter form precipitates, thus preventing the impurities from adhering to the post-filter again and causing blockage of the filter, thereby ensuring the recycling efficiency of the waste water.

[0009] A reversing valve for the above water purifier, comprising a valve body and a valve core. The valve body is provided with a first water inlet, a second water inlet, a waste water outlet, a backwash outlet, and a channel. The first water inlet, the second water inlet, the waste water outlet, and the backwash outlet are all connected to the channel. The first water inlet is connected to the post-filter one, the second water inlet is connected to the post-filter two, the waste water outlet is connected to the waste water tank, and the backwash outlet is connected to the backwash pump two. The first water inlet and the second water inlet are located on one side of the valve body, the waste water outlet and the backwash outlet are located on the other side of the valve body. The waste water outlet is located between the first water inlet and the second water inlet. The backwash outlet is coaxially arranged with the first water inlet. The valve core is slidably installed inside the channel. The valve core is provided with a first convex block, a second convex block, a third convex block, and a fourth convex block. The first convex block, the second convex block, the third convex block, and the fourth convex block are all semi-circular. The first convex block and the third convex block are located on one side of the valve core, the second convex block and the fourth convex block are located on the other side of the valve core. The same side of the first convex block and the second convex block is flush, and the opposite sides of the third convex block and the fourth convex block are flush. The valve body is provided with a first driving member and a second driving member. The first driving member is used to drive the valve core to reciprocate. The difference in length between the second convex block and the first convex block is equal to the maximum stroke of the reciprocating movement of the valve core. The second driving member is used to drive the valve core to rotate. The valve body is provided with a liquid injection assembly, and the liquid injection assembly is used to extract the flocculant inside the liquid supply tank during the movement of the valve core.

[0010] During normal operation, bump two blocks the backwash port, and bump one and bump three do not block inlet one and inlet two. At this time, the water source inside the wastewater tank can all undergo reverse osmosis filtration. During backwashing, the backwash water source enters the wastewater tank through inlet one and inlet two to collect the backwash wastewater. After the backwashing is completed, drive member one starts to push the valve core to move, so that bump one and bump three block inlet one and inlet two. At this time, bump two blocks the backwash port. After the wastewater is stationary for a set time, drive member two drives the valve core to rotate. At this time, bump two does not block inlet two, but bump two blocks inlet one, and bump one blocks the backwash port. At this time, the post-filter performs reverse osmosis treatment on the wastewater again, thereby improving the utilization rate of the wastewater. After the reuse of the wastewater is completed, drive member one starts, and the valve core slides to the other side. At this time, because the length of bump one is less than that of bump two, bump one cannot block the backwash port, and bump four blocks inlet two, and bump two blocks inlet one. At this time, the concentrated water in the wastewater tank is discharged to backwash the pre-filter. In this way, one valve can achieve wastewater collection, wastewater re-filtration, and wastewater utilization, making the water purifier cost lower and more convenient for the staff to operate.

[0011] Preferably, the liquid injection assembly includes a liquid inlet cavity and a liquid outlet cavity opened on the valve body. The liquid outlet cavity is communicated with the wastewater port. The valve core extends into the liquid inlet cavity and is slidably and sealingly connected with the liquid inlet cavity. A liquid inlet is opened on the liquid inlet cavity, and the liquid inlet is communicated with the liquid supply tank. Check valves are provided at both the communicating part of the liquid inlet and the liquid supply tank and the communicating part of the liquid outlet cavity and the wastewater port.

[0012] Through the settings of the liquid inlet cavity and the liquid outlet cavity, when the valve core moves back and forth, flocculant can be inhaled at the liquid inlet. Therefore, after the backwashing of the post-filter is completed, the backwashed wastewater can be flocculated and precipitated, so as to prevent the impurities after backwashing from adhering to the post-filter two again, thereby ensuring the working efficiency of the post-filter two and improving the filtering effect of the post-filter two, thus improving the utilization rate of the wastewater and reducing the use cost of the water purifier.

[0013] Preferably, a plurality of spiral blades are provided at the backwash port, and a filter screen frame is provided at one end of the backwash port away from the valve core. The filter screen frame is frustum-shaped, and a filter screen is provided on the side surface of the filter screen frame. The upper bottom surface of the filter screen frame faces the valve core.

[0014] Depending on the setting of the filter screen, sediment impurities inside the wastewater tank can be filtered. When the pre-filter is backwashed, these impurities enter the interior of the pre-filter, and then the impurities enter the interior of the post-filter again during the water purification process, resulting in an increased frequency of backwashing required for the post-filter. This avoids the increase in the number of backwashes from affecting the water purification efficiency and the service life of the post-filter. The spiral blade can make the water flow in a spiral manner. By relying on the centripetal force of the spiral flow, the impurities are moved to the inner wall of the backwash port. Furthermore, the middle hollow filter screen can also filter the impurities, and the hollow filter screen can avoid blocking the water flow and prevent the filter screen from being blocked and affecting the water pressure, thus ensuring the flushing effect on the pre-filter.

[0015] Preferably, a sewage discharge channel and a connection channel are provided on the valve body. One end of the connection channel is connected to the wastewater port, and the other end is connected to the backwash port on the side of the filter screen away from the valve core. The backwash port is connected to the sewage discharge channel, and solenoid valves are provided inside both the sewage discharge channel and the connection channel.

[0016] The setting of the sewage discharge channel can, through the control of the solenoid valve, rely on the discharge of wastewater to flush the filter screen, thereby avoiding impurities remaining on the filter screen and preventing the filter screen from being blocked and affecting the backwash water pressure, thus improving the flushing effect on the pre-filter and the utilization rate of wastewater.

[0017] Preferably, the filter screen frame consists of multiple swing rod assemblies. The swing rods are arranged annularly on the inner wall of the backwash port, and the swing rods are hinged to the inner wall of the backwash port. A support block that fits the swing rod is provided on the inner wall of the backwash port on the side of the swing rod away from the valve core, and a vibration spring is connected between the swing rod and the inner wall of the backwash port.

[0018] Preferably, the diameter of the swing rod gradually decreases along the axis of the backwash port. A counterweight ball is provided at one end of the swing rod along the axis of the backwash port. The cross-section of the swing rod is triangular, and the bottom surface faces downward.

[0019] The filter screen frame consists of multiple swing rods, and the swing rods are connected to the inner wall of the backwash port in a hinged manner. During backwashing, the support block supports the swing rod, which can prevent the swing rod from being damaged due to excessive torque. During sewage discharge, the water flow can push the swing rod, and under the action of the vibration spring, the swing rod can swing, making it easier for the impurities to fall off the filter screen, thereby improving the cleaning effect of the filter screen, enhancing the flushing effect on the pre-filter, and increasing the utilization rate of wastewater. The setting of the counterweight ball on the swing rod can improve the swinging effect of the swing rod, making the center of gravity of the swing rod located at the end of the swing rod. When the water flow impacts, the swing rod obtains a greater inertial force, further improving the swinging effect of the swing rod during water flow impact, and thus enhancing the cleaning effect of the filter screen.

[0020] Preferably, two limiting blocks are symmetrically arranged on the valve body. Limiting grooves are opened on the same side of the two limiting blocks. A limiting plate is arranged on the valve core. A switch one and a switch two are respectively arranged on the side walls of the two limiting grooves.

[0021] The arrangement of the limiting blocks can limit the rotation angle of the valve core and play a supporting role for the valve core, avoiding the problem that the rotation position of the valve core is offset and cannot be sealed, and avoiding the valve core from being offset under the action of water pressure, resulting in leakage of the reversing valve. The settings of switch one and switch two can control drive part one and drive part two, so that drive part one and drive part two operate in sequence, avoiding the problem that the reversing work is not carried out according to the set steps due to misoperation by the staff, which is likely to cause the outflow of waste water or the internal impurities to flow to the post-filter, resulting in the blockage of the post-filter and unable to operate normally.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Through the setting of the waste water tank, and the waste water tank is communicated with the post-filter two, the collected waste water can be filtered again, and the internal impurities are precipitated by injecting flocculant, so as to avoid the filtered impurities from adhering to the post-filter two again, thus ensuring the waste water recovery efficiency. After the waste water recovery is completed, the residual concentrated water after the waste water recovery can be used to backwash the pre-filter, so that the backwash waste water of the post-filter is recovered and then used to backwash the pre-filter, thereby improving the utilization rate of water resources.

[0024] 2. The reversing valve can be used to control multiple processes such as normal water purification operation, waste water collection, waste water static precipitation, and waste water backwashing. Therefore, when backwashing the water purifier, it is convenient for the staff to operate, and it is not easy for the staff to make operation errors resulting in damage to the internal equipment of the internal purifier.

[0025] 3. By setting the liquid injection assembly on the valve body, during the movement of the valve core, the automatic injection of the flocculant can be realized, making the operation more convenient and further improving the convenience of the staff's operation. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the water purifier of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall structure of the reversing valve of the present invention;

[0028] Figure 3 It is a cross-sectional view of the reversing valve of the present invention with the first water inlet and the second water inlet opened and the backwashing port closed;

[0029] Figure 4 It is a cross-sectional view of the reversing valve of the present invention with the first water inlet, the second water inlet and the backwashing port closed;

[0030] Figure 5 A cross-sectional view of the present invention's reversing valve with the second water inlet open and the first water inlet and the backwash port closed;

[0031] Figure 6 A cross-sectional view of the present invention's reversing valve with the first water inlet and the second water inlet closed and the backwash port open;

[0032] Figure 7 A cross-sectional view of the reversing valve of the invention;

[0033] Figure 8 is Figure 7 A partial enlarged view of part A in

[0034] In the figure: 1, pre-filter; 2, concentrated water tank; 3, pure water tank; 4, waste water tank; 5, post-filter; 51, first post-filter; 52, second post-filter; 6, supply pressure pump; 7, first backwash pump; 8, second backwash pump; 9, valve one; 10, valve two; 11, valve three; 12, supply liquid tank; 13, reversing valve; 14, valve body; 141, first water inlet; 142, second water inlet; 143, waste water port; 144, backwash port; 145, channel; 15, valve core; 151, first convex block; 152, second convex block; 153, third convex block; 154, fourth convex block; 16, first driving member; 17, second driving member; 18, liquid injection assembly; 181, liquid inlet chamber; 182, liquid outlet chamber; 183, liquid inlet port; 184, check valve; 19, spiral blade; 20, filter screen frame; 201, swing rod; 202, support block; 203, vibration spring; 204, counterweight ball; 21, filter screen; 22, sewage discharge channel; 23, connecting channel; 24, solenoid valve; 25, limit block; 26, limit groove; 27, limit plate; 28, switch one; 29, switch two; 30, valve four. Detailed implementation manners

[0035] Please refer to Figures 1 to 8 , the present invention provides a reversing valve 13 for a water purifier and a water purifier, and the technical solutions are as follows:

[0036] A water purifier includes a pre-filter 1, a post-filter 5, a pure water tank 3, a concentrated water tank 2, and a waste water tank 4. The post-filter 5 is divided into a first post-filter 51 and a second post-filter 52. The pre-filter 1 is connected to the concentrated water tank 2 through a pipeline. The concentrated water tank 2 and the waste water tank 4 are connected to the first post-filter 51 and the second post-filter 52 through pipelines. The first post-filter 51 and the second post-filter 52 are connected to the pure water tank 3 through a pipeline, and a valve four 30 is provided on the connecting pipeline. A pressure supply pump 6 is connected to the pre-filter 1. A first backwash pump 7 is provided on one side of the pure water tank 3 where the first post-filter 51 and the second post-filter 52 are located. A second backwash pump 8 is connected between the waste water tank 4 and the pre-filter 1. A valve one 9 is provided at the connecting pipeline between the pre-filter 1 and the concentrated water tank 2. A valve two 10 is provided at the connecting pipeline between the concentrated water tank 2 and the post-filter 5. A valve three 11 is provided at the connecting pipeline between the concentrated water tank 2 and the second post-filter 52. The valve one 9, the valve two 10, the valve three 11, and the valve four 30 all adopt two-way ball valves. The waste water tank 4 is connected to the first post-filter 51 and the second post-filter 52 through a reversing valve 13. An air supply device is connected to the waste water tank 4, and the air supply device is a compressed air system. A liquid supply tank 12 is connected to the reversing valve 13, and a flocculant is stored inside the liquid supply tank 12. The flocculant adopts polyacrylamide; during normal operation, the valve one 9, the valve two 10, the valve three 11, and the valve four 30 are opened. At this time, the water flow flows along the pre-filter 1, the concentrated water tank 2, the post-filter 5, and the pure water tank 3 under the transmission of the pressure supply pump 6, and the water purifier conducts water purification work. When the post-filter 5 is blocked, the valve one 9, the valve two 10, the valve three 11, and the valve four 30 are closed, and the first backwash pump 7 is started, and the reversing valve 13 is switched to connect the post-filter 5 with the waste water tank 4. At this time, the backwash pump can backwash the post-filter 5 and collect the backwash waste water. After the backwashing of the post-filter 5 is completed, the reversing valve 13 is switched to disconnect the post-filter 5 from the waste water tank 4. At this time, the valve one 9, the valve two 10, the valve three 11, and the valve four 30 can be opened for normal water purification operation. During the backwashing process, the liquid supply tank 12 injects the flocculant into the waste water tank 4. Therefore, the suspended solids in the waste water agglomerate and precipitate, so as to avoid subsequent impurities attaching to the post-filter 5 again and causing the post-filter 5 to be blocked, thereby ensuring the waste water recovery efficiency and recovery rate. After the waste water precipitation treatment is completed, the valve three 11 is closed, and the reversing valve 13 is switched to connect the waste water tank 4 with the second post-filter 52. At this time, the first post-filter 51 conducts normal operation, and the second post-filter 52 is used for waste water recovery. During the recovery process, the air supply device supplies air to the inside of the waste water tank 4 to ensure the pressure inside the waste water tank 4. After the waste water recovery is completed, the reversing valve 13 is switched to connect the waste water tank 4 with the pre-filter 1, and the waste water tank 4 is disconnected from the post-filter 5. The valve one 9 is closed, and the second backwash pump 8 is started. At this time, the pre-filter 1 can be backwashed with the recovered waste water, thereby effectively improving the utilization rate of the waste water and reducing the use cost of the water purifier.

[0037] A water purifier reversing valve 13 for the above water purifier, comprising a valve body 14 and a valve core 15. The valve body 14 is provided with a first water inlet 141, a second water inlet 142, a waste water outlet 143, a backwash outlet 144 and a channel 145. The first water inlet 141, the second water inlet 142, the waste water outlet 143 and the backwash outlet 144 are all communicated with the channel 145. The first water inlet 141 is connected to the first post-filter 51, the second water inlet 142 is connected to the second post-filter 52, the waste water outlet 143 is connected to the waste water tank 4, and the backwash outlet 144 is connected to the second backwash pump 8. The first water inlet 141 and the second water inlet 142 are located on one side of the valve body 14, the waste water outlet 143 and the backwash outlet 144 are located on the other side of the valve body 14. The waste water outlet 143 is located between the first water inlet 141 and the second water inlet 142, and the backwash outlet 144 is coaxially arranged with the first water inlet 141. The valve core 15 is slidably installed inside the channel 145. The valve core 15 is provided with a first convex block 151, a second convex block 152, a third convex block 153 and a fourth convex block 154. The first convex block 151, the second convex block 152, the third convex block 153 and the fourth convex block 154 are all semi-circular. The first convex block 151 and the third convex block 153 are located on one side of the valve core 15, and the second convex block 152 and the fourth convex block 154 are located on the other side of the valve core 15. The same side surfaces of the first convex block 151 and the second convex block 152 are flush, and the opposite side surfaces of the third convex block 153 and the fourth convex block 154 are flush. The valve body 14 is provided with a first driving member 16 and a second driving member 17. The first driving member 16 is used to drive the valve core 15 to reciprocate. The difference in length between the second convex block 152 and the first convex block 151 is equal to the maximum reciprocating stroke of the valve core 15. The second driving member 17 is used to drive the valve core 15 to rotate. The first driving member 16 adopts electromagnetic drive, and the second driving member 17 adopts pneumatic drive. The valve body 14 is provided with a liquid injection assembly 18;When backwashing the post-filter 5, the second driving member 17 drives the valve core 15 to rotate. At this time, neither the first convex block 151 nor the third convex block 153 blocks the first water inlet 141 and the second water inlet 142, while the second convex block 152 blocks the backwash port 144. At this time, the backwash wastewater of the post-filter 5 can enter the wastewater tank 4 through the reversing valve 13. After the backwashing is completed, the first driving member 16 drives the valve core 15 to move, so that the first convex block 151 and the third convex block 153 respectively block the first water inlet 141 and the second water inlet 142, and the second convex block 152 still blocks the backwash port 144. At this time, the wastewater port 143 is disconnected from both the post-filter 5 and the pre-filter 1. At this time, injecting a flocculant into the wastewater tank 4 can precipitate the wastewater. After the precipitation treatment is completed, the second driving member 17 drives the valve core 15 to rotate. At this time, the third convex block 153 and the first convex block 151 rotate to one side of the backwash port 144, while the second convex block 152 and the fourth convex block 154 rotate to the other side. At this time, the fourth convex block 154 does not block the second water inlet 142, while the backwash port 144 and the first water inlet 141 are respectively blocked by the first convex block 151 and the second convex block 152. At this time, the second water inlet 142 is opened, and at this time, the wastewater can be filtered again. After the wastewater is filtered again, the first driving member 16 is started to move the valve core 15. At this time, the fourth convex block 154 and the second convex block 152 respectively block the second water inlet 142 and the first water inlet 141, while the first convex block 151 does not block the backwash port 144. At this time, the backwash port 144 is in an open state. At this time, the backwash pump can be started to extract the wastewater in the wastewater tank 4 to backwash the pre-filter 1. In this way, one valve can realize the collection, re-filtering and utilization of wastewater, making the water purifier cost lower and more convenient for the staff to operate; two limit blocks 25 are symmetrically arranged on the valve body 14, and limit grooves 26 are opened on the same side of the two limit blocks 25. A limit plate 27 is arranged on the valve core 15, and a first switch 28 and a second switch 29 are respectively arranged on the side walls of the two limit grooves 26; when the limit plate 27 contacts the first switch 28 or the second switch 29, at this time, the first switch 28 or the second switch 29 controls that the second driving member 17 cannot be driven, and thus only the first driving member 16 can be controlled to move. When the limit plate 27 does not contact the first switch 28 and the second switch 29, at this time, the first driving member 16 is controlled not to be driven, and thus only the second driving member 17 can be controlled to move. Therefore, when the staff controls the reversing valve 13 to reverse, the first driving member 16 and the second driving member 17 operate in sequence, avoiding the problem that the staff's misoperation causes the reversing not to be carried out according to the set steps, which is likely to cause the wastewater to flow out or the internal impurities to flow to the post-filter 5, resulting in the blockage of the post-filter 5 and the inability to operate normally.;

[0038] The liquid injection assembly 18 includes a liquid inlet cavity 181 and a liquid outlet cavity 182 opened on the valve body 14. The liquid outlet cavity 182 is communicated with the waste water port 143. The valve core 15 extends into the liquid inlet cavity 181 and is slidably and sealingly connected with the liquid inlet cavity 181. A liquid inlet port 183 is opened on the liquid inlet cavity 181, and the liquid inlet port 183 is communicated with the liquid supply tank 12. One-way valves 184 are provided at both the communicating part of the liquid inlet port 183 and the liquid supply tank 12 and the communicating part of the liquid outlet cavity 182 and the waste water port 143. The communicating part of the liquid inlet port 183 and the liquid supply tank 12 uses a diaphragm one-way valve 184, and the communicating part of the liquid outlet cavity 182 and the waste water port 143 uses a spherical one-way valve 184. When the valve core 15 moves to one side of the liquid inlet cavity 181, the valve core 15 extrudes the flocculant inside the liquid inlet cavity 181. When the valve core 15 moves to the other side, the liquid inlet cavity 181 sucks in the flocculant, so that the flocculant enters the waste water tank 4. When the valve core 15 moves to one side of the liquid inlet cavity 181, at this time, the post-filter 5 is backwashed, and the waste water is precipitated. Therefore, the movement of the valve core 15 can realize the automatic addition of the flocculant, thereby ensuring the working efficiency of the post-filter two 52, improving the filtering effect of the post-filter two 52, and thus improving the utilization rate of the waste water. The setting of the one-way valve 184 can avoid the problem of the flocculant deterioration caused by the liquid backflow.

[0039] Inside the backwash port 144, there is a filter screen rack 20, and a filter screen 21 is laid on the filter screen rack 20. When backwashing the pre-filter 1, sediment impurities can be filtered by the filter screen 21 to prevent some impurities from entering the inside of the pre-filter 1, which may otherwise cause the impurities to enter the post-filter 5 again during the water purification process, resulting in an increased frequency of backwashing for the post-filter 5. This avoids the increase in the number of backwashing operations from affecting the water purification efficiency and the service life of the post-filter 5. Between the filter screen 21 and the channel 145 in the backwash port 144, there are multiple spiral vanes 19. The filter screen rack 20 is a frustum-shaped rack, making the middle of the filter screen 21 hollow. The spiral vanes 19 can cause the water flow to generate vortices, and relying on the centripetal force of the spiral flow, the impurities are thrown to the inner wall of the backwash port 144, enabling the hollow filter screen 21 to also filter impurities. Therefore, it avoids the problem of the backwash water pressure decreasing due to the blockage of the filter screen 21, which may otherwise affect the backwash effect, thereby effectively improving the utilization rate of wastewater and increasing economic benefits; on the valve body 14, there are a sewage discharge channel 22 and a connection channel 23. One end of the connection channel 23 is connected to the wastewater port 143, and the other end is connected to the backwash port 144 on the side of the filter screen 21 away from the valve core 15. The backwash port 144 is connected to the sewage discharge channel 22, and solenoid valves 24 are provided inside both the sewage discharge channel 22 and the connection channel 23; through the setting of the sewage discharge port, the solenoid valve 24 controls the opening of the sewage discharge port and connects the wastewater port 143 with the backwash port 144, thereby discharging the residual wastewater in the wastewater tank 4 and backwashing the filter screen 21, avoiding the blockage of the filter screen 21 from affecting the backwash water pressure, thus improving the flushing effect of the pre-filter 1 and the utilization rate of wastewater; the filter screen rack 20 consists of multiple swing rod 201 components. The swing rods 201 are arranged annularly on the inner wall of the backwash port 144, and the swing rods 201 are hinged to the inner wall of the backwash port 144. On the inner wall of the backwash port 144, on the side of the swing rod 201 away from the valve core 15, there is a support block 202 that fits the swing rod 201, and a vibration spring 203 is connected between the swing rod 201 and the inner wall of the backwash port 144; the filter screen rack 20 is composed of multiple swing rods 201, and the swing rods 201 are connected to the inner wall of the backwash port 144 in a hinged manner. During backwashing, the support block 202 supports the swing rod 201, preventing the swing rod 201 from being damaged due to excessive torque. During sewage discharge, the water flow can push the swing rod 201, and under the action of the vibration spring 203, the swing rod 201 can swing, making it easier for the impurities to fall off the filter screen 21, thereby improving the cleaning effect of the filter screen 21, the flushing effect of the pre-filter 1, and the utilization rate of wastewater. The setting of the counterweight ball 204 on the swing rod 201 can improve the swinging effect of the swing rod 201, making the center of gravity of the swing rod 201 located at the end of the swing rod 201. When the water flow impacts, the swing rod 201 obtains a greater inertial force, further improving the swinging effect of the swing rod 201 during water flow impact, thereby improving the cleaning effect of the filter screen 21; the cross-section of the swing rod 201 is triangular, and the bottom surface faces downward;This setting creates an inclined plane above the swing rod 201, avoiding a large impact force of the water flow on the swing rod 201, which may cause damage to the swing rod 201, and can also avoid excessive energy loss caused by the swing rod 201, thus affecting the backwashing water pressure, and ensuring the backwashing effect.

[0040] Working principle: During normal operation, valve one 9, valve two 10, valve three 11, and valve four 30 are opened. At this time, water flows along the pre-filter 1, concentrated water tank 2, post-filter 5, and pure water tank 3 under the transmission of the pressure supply pump 6, and the water purifier conducts water purification work. When the post-filter 5 becomes blocked, valve one 9, valve two 10, valve three 11, and valve four 30 are closed, the backwash pump one 7 is started, and the driving member two 17 is controlled to drive the valve core 15 to rotate. At this time, neither the first convex block 151 nor the third convex block 153 blocks the first water inlet 141 and the second water inlet 142, while the second convex block 152 blocks the backwash port 144. At this time, the backwash wastewater of the post-filter 5 can enter the wastewater tank 4 through the reversing valve 13. After the backwash is completed, the driving member one 16 drives the valve core 15 to move, so that the first convex block 151 and the third convex block 153 respectively block the first water inlet 141 and the second water inlet 142, and the second convex block 152 still blocks the backwash port 144. At this time, the wastewater port 143 is disconnected from both the post-filter 5 and the pre-filter 1. During the movement of the valve core 15, the valve core 15 squeezes the flocculant inside the liquid inlet cavity 181, so that the flocculant enters the wastewater port 143 along the liquid outlet cavity 182, and then injects the flocculant into the wastewater tank 4 to precipitate the wastewater inside the wastewater tank 4. When the precipitation treatment is carried out, valve one 9, valve two 10, valve three 11, and valve four 30 can be opened to conduct normal water purification operations. After the wastewater precipitation treatment is completed, valve three 11 is closed, and the driving member two 17 is controlled to drive the valve core 15 to rotate. At this time, the third convex block 153 and the first convex block 151 rotate to one side of the backwash port 144, while the second convex block 152 and the fourth convex block 154 rotate to the other side. At this time, the fourth convex block 154 does not block the second water inlet 142, while the backwash port 144 and the first water inlet 141 are respectively blocked by the first convex block 151 and the second convex block 152. At this time, the second water inlet 142 is opened, so that the wastewater tank 4 is communicated with the second post-filter 52. At this time, the air supply device supplies air into the wastewater tank 4 to ensure the water pressure inside the wastewater tank 4. At this time, the wastewater can be filtered again. After the wastewater is filtered again, valve one 9 is closed, and the driving member one 16 is controlled to start, so that the valve core 15 moves. At this time, the fourth convex block 154 and the second convex block 152 respectively block the second water inlet 142 and the first water inlet 141, while the first convex block 151 does not block the backwash port 144. At this time, the backwash port 144 is in an open state. At this time, the backwash pump two 8 can be started to pump the wastewater in the wastewater tank 4 to conduct backwashing on the pre-filter 1. In this way, with one valve, the collection, re-filtration, and utilization of wastewater can be realized, making the water purifier have a lower cost and enabling the staff to be more convenient during operation. After the backwashing of the pre-filter 1 is completed, the backwash pump two 8 can be closed, and valve one 9 and valve three 11 can be opened. At this time, the water purifier resumes normal operation. When it is necessary to discharge the residual wastewater, the solenoid valve 24 is opened. At this time, the sewage discharge channel 22 is opened, and the wastewater port 143 is communicated with the backwash port 144 through the connection channel 23. At this time, the water flow can discharge the wastewater tank 4, and during the discharge process,The remaining wastewater is used to backwash the filter screen 21 to prevent the filter screen 21 from being blocked.

[0041] The above has described in detail a specific embodiment of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiment. For those skilled in the art, without departing from the principle and idea of the present invention, various changes, modifications, substitutions, and variations made to these embodiments should still fall within the protection scope of the present invention.

Claims

1. A water purifier, characterized in that, It includes a pre-filter (1), a post-filter (5), a pure water tank (3), a concentrated water tank (2), and a waste water tank (4). The post-filter (5) is divided into a first post-filter (51) and a second post-filter (52). The pre-filter (1) is connected to the concentrated water tank (2) through a pipeline. The concentrated water tank (2) and the waste water tank (4) are connected to the first post-filter (51) and the second post-filter (52) through pipelines. The first post-filter (51) and the second post-filter (52) are connected to the pure water tank (3) through a pipeline, and a valve four (30) is provided on the connecting pipeline. A supply pump (6) is connected to the pre-filter (1). A first backwash pump (7) is provided on one side of the pure water tank (3) where the first post-filter (51) and the second post-filter (52) are located. A second backwash pump (8) is connected between the waste water tank (4) and the pre-filter (1). A valve one (9) is provided at the connecting pipeline between the pre-filter (1) and the concentrated water tank (2). A valve two (10) is provided at the connecting pipeline between the concentrated water tank (2) and the post-filter (5). A valve three (11) is provided at the connecting pipeline between the concentrated water tank (2) and the second post-filter (52). The waste water tank (4) is connected to the first post-filter (51) and the second post-filter (52) through a reversing valve (13). An air supply device is connected to the waste water tank (4). A liquid supply tank (12) is connected to the reversing valve (13), and a flocculant is stored inside the liquid supply tank (12).

2. A water purifier reversing valve for the water purifier described in claim 1, characterized in that, It includes a valve body (14) and a valve core (15). The valve body (14) is provided with a first water inlet (141), a second water inlet (142), a waste water outlet (143), a backwash port (144) and a channel (145). The first water inlet (141), the second water inlet (142), the waste water outlet (143) and the backwash port (144) are all communicated with the channel (145). The first water inlet (141) is connected to a first post-filter (51), the second water inlet (142) is connected to a second post-filter (52), the waste water outlet (143) is connected to a waste water tank (4), and the backwash port (144) is connected to a second backwash pump (8). The first water inlet (141) and the second water inlet (142) are located on one side of the valve body (14), the waste water (143) and the backwash port (144) are located on the other side of the valve body (14). The waste water outlet (143) is located between the first water inlet (141) and the second water inlet (142). The backwash port (144) is coaxially arranged with the first water inlet (141). The valve core (15) is slidably installed inside the channel (145). The valve core (15) is provided with a first convex block (151), a second convex block (152), a third convex block (153) and a fourth convex block (154). The first convex block (151), the second convex block (152), the third convex block (153) and the fourth convex block (154) are all semi-circular in shape. The first convex block (151) and the third convex block (153) are located on one side of the valve core (15), and the second convex block (152) and the fourth convex block (154) are located on the other side of the valve core (15). The same side of the first convex block (151) and the second convex block (152) is flush, and the opposite sides of the third convex block (153) and the fourth convex block (154) are flush. The valve body (14) is provided with a first driving member (16) and a second driving member (17). The first driving member (16) is used to drive the valve core (15) to reciprocate. The difference in length between the second convex block (152) and the first convex block (151) is equal to the maximum reciprocating stroke of the valve core (15). The second driving member (17) is used to drive the valve core (15) to rotate. The valve body (14) is provided with a liquid injection assembly (18). The liquid injection assembly (18) is used to extract the flocculant inside the liquid supply tank (12) during the movement of the valve core (15).

3. The water purifier reversing valve according to claim 2, characterized in that, The liquid injection assembly (18) includes a liquid inlet cavity (181) and a liquid outlet cavity (182) opened on the valve body (14). The liquid outlet cavity (182) is communicated with the waste water (143). The valve core (15) extends into the liquid inlet cavity (181) and is slidably and sealingly connected to the liquid inlet cavity (181). The liquid inlet cavity (181) is provided with a liquid inlet (183). The liquid inlet (183) is communicated with the liquid supply tank (12). One-way valves (184) are provided at the connection part between the liquid inlet (183) and the liquid supply tank (12) and at the connection part between the liquid outlet cavity (182) and the waste water (143).

4. The water purifier reversing valve according to claim 2, characterized in that, A plurality of spiral vanes (19) are provided at the backwashing port (144), and a filter screen frame (20) is provided at one end of the backwashing port (144) away from the valve core (15) where the spiral vanes (19) are located. The filter screen frame (20) is frustum-shaped, and a filter screen (21) is provided on the side surface of the filter screen frame (20). The upper bottom surface of the filter screen frame (20) faces the valve core (15).

5. The water purifier reversing valve according to claim 4, characterized in that, A sewage discharge channel (22) and a communication channel (23) are formed on the valve body (14). One end of the communication channel (23) is communicated with the waste water port (143), and the other end is connected to the side of the backwashing port (144) away from the valve core (15) where the filter screen (21) is located. The backwashing port (144) is communicated with the sewage discharge channel (22), and solenoid valves (24) are provided inside both the sewage discharge channel (22) and the communication channel (23).

6. The reversing valve of a water purifier according to claim 5, characterized in that, The filter screen frame (20) consists of a plurality of swing rod (201) assemblies. The swing rods (201) are annularly arranged on the inner wall of the backwashing port (144), and the swing rods (201) are hinged to the inner wall of the backwashing port (144). A support block (202) that fits the swing rod (201) is provided on the inner wall of the backwashing port (144) on the side away from the valve core (15) of the swing rod (201). A vibration spring (203) is connected between the swing rod (201) and the inner wall of the backwashing port (144).

7. The reversing valve of a water purifier according to claim 6, characterized in that, The diameter of the swing rod (201) gradually decreases along the axis of the backwashing port (144). A counterweight ball (204) is provided at one end of the swing rod (201) along the axis of the backwashing port (144). The cross-section of the swing rod (201) is triangular, and the bottom surface faces downwards.

8. The reversing valve of a water purifier according to claim 2, characterized in that Two limit blocks (25) are symmetrically provided on the valve body (14). Limit grooves (26) are formed on the same side of the two limit blocks (25). A limit plate (27) is provided on the valve core (15). A switch one (28) and a switch two (29) are respectively provided on the side walls of the two limit grooves (26).

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