Water-saving type secondary purification ultra-clean water system

Abstract

The application discloses a water-saving type secondary purification super-clean water system, which comprises a tap water inlet system, a primary filtration system, a reverse osmosis filtration system, a concentrated water diversion and recovery system and a multifunctional pressure container; a tap water inlet is connected with external tap water supply; a tap water supply port is divided into two branches, one of which is connected with a tap water area inlet and outlet, and the other is connected with a primary filtration inlet; a primary filtration outlet is connected with a raw water inlet; a pure water storage and taking port is connected with a pure water area inlet and outlet; a secondary pure water storage and taking port is connected with a secondary pure water area inlet and outlet; a concentrated water outlet is connected with a recovery inlet; a recovery outlet is connected with a raw water inlet; a concentrated water storage and taking port is connected with a concentrated water area inlet and outlet; and a tap water supplement port is connected with a coarse filtration blowdown valve, a preposed ultrafiltration blowdown valve or a postposed ultrafiltration blowdown valve; the application has water taking mode, water making mode, zero standing water flushing mode, purification mode, membrane washing mode and acid washing mode; the concentrated water flow and the recovery water flow can be adjusted by adjusting the adjustable concentrated water proportion valve and the adjustable recovery proportion valve, and the reverse osmosis membrane front pressure can be controlled.

Description

Technical Field

[0001] This invention relates to the field of water treatment system technology, and in particular to a water-saving secondary purification ultrapure water system. Background Technology

[0002] Ultrafiltration and reverse osmosis membrane cartridges can effectively filter impurities in water and are used in many water purification systems.

[0003] Ultrafiltration membrane filter cartridges have a filtration precision of about 10 nanometers. During use, they trap and filter impurities such as bacteria, organic matter, and suspended solids. These impurities accumulate in the membrane module and may cause blockage after a period of time, affecting the performance of the membrane module. In severe cases, they may even contaminate the membrane module, greatly reducing its service life and affecting the normal operation of the water purification system in which it is located.

[0004] Total dissolved solids (TDS), also known as total dissolved solids, is measured in ppm or mg / L. It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more dissolved substances are contained in the water. Under the same conditions of raw water, pure water-to-waste ratio, pressure, etc., the higher the TDS of the pure water obtained after filtration by the reverse osmosis membrane cartridge, the more residues are left after filtration, indicating a poorer filtration effect.

[0005] Under pressure, reverse osmosis membrane filter cartridges produce pure water and concentrated water. However, a problem exists: when the filter cartridge is in standby mode, ions from the concentrated water side remaining inside the cartridge gradually diffuse through the membrane to the pure water side, contaminating the pure water. This contaminated pure water is generally referred to as "stale water." Stale water causes an increase in the TDS (Total Dissolved Solids) of the pure water at the filter cartridge's pure water end. When users take pure water, the high TDS at the beginning of the process fails to meet their requirements.

[0006] Due to the high concentration of concentrate inside the reverse osmosis membrane filter element, crystallization and scaling can occur on the concentrate side of the reverse osmosis membrane filter element after long-term use. Small accumulations can greatly reduce the service life of the reverse osmosis membrane filter element and affect the normal operation of the water purification system in which it is located.

[0007] People now have increasingly higher requirements for drinking water, and the TDS of pure water produced by ordinary water purification systems using reverse osmosis membrane filter cartridges for one-time filtration is gradually failing to meet these requirements.

[0008] Some existing water purification systems, in order to avoid the problem of ultrafiltration membrane cartridge clogging, default to using ultrafiltration cartridges in their design. Although this avoids the problem of ultrafiltration membrane cartridge clogging, the lack of fine filtration at the ultrafiltration stage allows impurities such as bacteria, organic matter, and suspended solids to reach the reverse osmosis stage. This affects the performance of the relatively more expensive reverse osmosis membrane cartridge, greatly reducing its lifespan and affecting the normal operation of the water purification system.

[0009] Some existing water purification systems are equipped with additional water tanks and pumps. The additional pumps can be used to draw pure water from the water tanks to perform zero-stagnant water rinsing on the reverse osmosis membranes after use, and to quickly supply pure water to users. However, as the water level in the water tanks increases or decreases, external air is drawn in and discharged, introducing additional sources of contamination.

[0010] The initial installation of reverse osmosis membrane filter cartridges requires rinsing to remove their protective solution. The pure water produced during the reverse osmosis membrane washing process is slightly contaminated and unusable. Some existing water purification systems discharge both unusable pure water and wastewater during the reverse osmosis membrane washing process. Because the washing time is long and often more pure water is produced and discharged than wastewater during the washing process, the waste of water resources is very serious.

[0011] The concentrated water produced during the water production process of reverse osmosis membrane filter cartridges has the value of reuse, but it is not recycled and reused.

[0012] Therefore, the above issues need to be optimized. Summary of the Invention

[0013] The present invention aims to at least partially solve one of the aforementioned technical problems in related technologies. To this end, the present invention proposes a water-saving secondary purification ultrapure water system.

[0014] To achieve the above objectives, the technical solution of the present invention is as follows:

[0015] An embodiment of a water-saving secondary purification ultrapure water system provided by the present invention includes: a tap water inlet system, a primary filtration system, a reverse osmosis filtration system, a concentrate diversion and recovery system, and a multi-functional pressure vessel.

[0016] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the tap water inlet system is provided with a tap water inlet, a water pressure reducing valve, a water TDS monitoring device, a water flow sensor, and a tap water supply port connected in sequence.

[0017] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the primary filtration system is provided with a primary filtration inlet, a coarse filtration module, a pre-ultrafiltration module, an activated carbon filtration module, and a post-ultrafiltration module connected in sequence. The outlet of the post-ultrafiltration module is divided into two branches, one of which is connected to the primary filtration outlet, and the other is connected in sequence to a direct-outlet primary filtration water flow sensor and a direct primary filtration water outlet. The drain port of the coarse filtration module is connected to a coarse filtration drain valve, the drain port of the pre-ultrafiltration module is connected to a pre-ultrafiltration drain valve, and the drain port of the post-ultrafiltration module is connected to a post-ultrafiltration drain valve.

[0018] According to an embodiment of the reverse osmosis filtration system of a water-saving secondary purification ultrapure water system provided by the present invention, the raw water inlet of the reverse osmosis filtration system is sequentially connected to the raw water one-way valve and the raw water inlet solenoid valve. The outlet of the inlet solenoid valve is sequentially connected to a booster pump, a reverse osmosis membrane filter element, a pure water TDS monitoring device, a reverse osmosis filter element water flow sensor, and the inlet of a pure water diversion solenoid valve. The first-stage pure water outlet of the pure water diversion solenoid valve is connected to a pure water one-way valve. The outlet of the pure water one-way valve is divided into three branches: the first branch is sequentially connected to a low-pressure switch, a zero-stagnant water flushing water flow sensor, a zero-stagnant water flushing one-way valve, and the flushing inlet of the inlet solenoid valve; the second branch is connected to a pure water storage / retrieval port; and the third branch is connected to a water intake water flow sensor and a pressure holding device. The pressure-holding check valve has three outlets: the first connects to the pure water outlet, the second connects to the membrane washing check valve and the membrane washing valve, and the third connects to the pressure relief proportional valve, the high-pressure switch, and the pressure relief solenoid valve in sequence. The secondary pure water outlet of the pure water flow solenoid valve is connected to the secondary pure water check valve. The outlet of the secondary pure water check valve has two outlets: one connects to the secondary pure water inlet and outlet, and the other connects to the secondary water flow sensor and the secondary pressure-holding check valve in sequence. The outlet of the secondary pressure-holding check valve has two outlets: one connects to the secondary pure water outlet, and the other connects to the secondary pressure relief proportional valve, the secondary high-pressure switch, and the secondary pressure relief solenoid valve in sequence. The concentrate outlet of the reverse osmosis membrane filter element is connected to the concentrate check valve and the concentrate outlet in sequence.

[0019] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the concentrate diversion and recovery system is provided with a recovery inlet, a reverse osmosis membrane pre-pressure monitoring device, and a concentrate TDS monitoring device connected in sequence. The outlet of the concentrate TDS monitoring device is divided into two branches. One branch is connected in sequence to an adjustable concentrate proportional valve and a concentrate diversion solenoid valve inlet, and the other branch is connected to an adjustable recovery proportional valve. The outlet of the adjustable recovery proportional valve is divided into three branches. The first branch is provided with a recovery check valve and a recovery outlet connected in sequence. The second branch is connected to a membrane washing water outlet, and the third branch is connected to the concentrate diversion solenoid valve recovery outlet. The drain outlet of the concentrate diversion solenoid valve is provided with a drain flow sensor and a drain check valve connected in sequence. The outlet of the drain check valve is divided into two branches. One branch is connected to a concentrate storage port, and the other branch is connected in sequence to the normally open side of a concentrate four-way valve and a concentrate reuse check valve. The outlet of the concentrate reuse check valve is divided into two branches. One branch is connected to a wastewater reuse outlet, and the other branch is connected in sequence to the normally closed side of a concentrate four-way valve and a tap water supply port.

[0020] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the multifunctional pressure vessel is provided with a concentrated water zone, a concentrated water zone inlet and outlet, a tap water zone, a tap water zone inlet and outlet, a pressure zone, a valve core, a pure water zone, a pure water zone inlet and outlet, a pure water zone outlet, a secondary pure water zone, a secondary pure water zone inlet and outlet, and a secondary pure water zone outlet. The pure water zone outlet is sequentially connected to a pure water zone outlet check valve, a pure water zone flow sensor, and a second pure water outlet. The secondary pure water zone outlet is sequentially connected to a secondary pure water zone outlet check valve, a secondary pure water zone flow sensor, and a second secondary pure water outlet.

[0021] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the tap water inlet is connected to an external tap water supply, the tap water supply outlet is divided into two branches, one branch is connected to the tap water zone inlet and the other branch is connected to the primary filter inlet, the primary filter outlet is connected to the raw water inlet, the pure water storage port is connected to the pure water zone inlet and outlet, the secondary pure water storage port is connected to the secondary pure water zone inlet and outlet, the concentrated water outlet is connected to the recovery inlet, the recovery outlet is connected to the raw water inlet, the concentrated water storage port is connected to the concentrated water zone inlet and outlet, and the tap water replenishment port is connected to the coarse filter drain valve, the pre-ultrafiltration drain valve, or the post-ultrafiltration drain valve.

[0022] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the functions of the tap water inlet system include: the inlet pressure reducing valve reduces the water supply pressure, prevents backflow, and provides a stable water supply pressure; the tap water inlet system supplies water to the primary filtration system and the multifunctional pressure vessel.

[0023] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the primary filtration system functions as follows: providing high-quality raw water to the reverse osmosis filtration system through layer-by-layer filtration via the coarse filtration module, the pre-ultrafiltration module, the activated carbon filtration module, and the post-ultrafiltration module; and providing users with high-quality, directly usable pre-filtered water through layer-by-layer filtration via the coarse filtration module, the pre-ultrafiltration module, the activated carbon filtration module, and the post-ultrafiltration module.

[0024] An embodiment of a water-saving secondary purification ultrapure water system provided by the present invention includes the following modes: Mode 1 (Water Intake Mode): When the second pure water outlet is opened, the pure water zone is driven by the water pressure from the tap water zone to discharge pure water to the second pure water outlet. When the second secondary pure water outlet is opened, the secondary pure water zone is driven by the water pressure from the tap water zone to discharge secondary pure water to the second secondary pure water outlet. Due to the presence of the pressure-holding one-way valve and the secondary pressure-holding one-way valve, the high-pressure switch and the secondary high-pressure switch are not triggered, and the reverse osmosis filtration system is not started. Mode 2 (Water Production Mode): When the pure water outlet is opened, or the pressure relief solenoid valve is switched on and off, low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into water production mode. The raw water inlet and outlet of the inlet solenoid valve are connected, the flushing inlet of the inlet solenoid valve is closed, the inlet and primary pure water outlet of the pure water diversion solenoid valve are connected, and the secondary pure water outlet of the pure water diversion solenoid valve is closed. The booster pump pumps raw water into the reverse osmosis membrane filter element for filtration. The produced pure water flows out from the pure water port of the reverse osmosis membrane filter element and flows to the pure water storage port or the pure water outlet. The generated concentrated water flows out from the concentrated water port of the reverse osmosis membrane filter element and flows to the concentrated water outlet. After the pure water outlet is closed, the produced pure water is stored in the pure water zone. When the pure water zone is full, the pressure increases, triggering the high-pressure switch to turn off, and the water production mode of the reverse osmosis filtration system ends. Mode 3 (Zero Stagnant Water Flushing Mode): When the secondary pure water outlet is opened, or the secondary pressure relief solenoid valve is switched on and off, the low water pressure triggers the secondary high-pressure switch to turn on, and the reverse osmosis filtration system enters the zero stagnant water flushing mode. The flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, the inlet and primary pure water outlet of the pure water diversion solenoid valve are connected, and the secondary pure water outlet of the pure water diversion solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter element and the pure water in the pure water zone flow to the inlet of the booster pump. The booster pump pumps the pure water into the reverse osmosis membrane filter element for zero stagnant water flushing, and discharges the concentrated water in the reverse osmosis membrane filter element to avoid the generation of stagnant water. Mode 4 (Purification Mode): In the zero-wash water flushing mode, if the pure water TDS monitoring device detects that the TDS value of the produced pure water reaches the secondary pure water standard, the zero-wash water flushing mode ends, and the reverse osmosis filtration system enters the purification mode. The flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, the inlet and secondary pure water outlet of the pure water diversion solenoid valve are connected, and the primary pure water outlet of the pure water diversion solenoid valve is closed. The booster pump pumps pure water into the reverse osmosis membrane filter element for secondary purification. The resulting concentrate flows out from the concentrate port of the reverse osmosis membrane filter element and flows to the concentrate outlet. The produced secondary pure water flows to the secondary pure water storage port or to the secondary pure water outlet one. After the secondary pure water outlet one is closed, the produced secondary pure water is stored in the secondary pure water zone. When the secondary pure water zone is full, the pressure increases, triggering the secondary high-pressure switch to disconnect, and the purification mode of the reverse osmosis filtration system ends. Mode 5 (Membrane Washing Mode): Close the pure water inlet / outlet, connect the membrane washing valve to the primary filtrate outlet, switch the pure water outlet 1 or the pressure relief solenoid valve, low water pressure triggers the high-pressure switch to turn on, start the reverse osmosis filtration system to enter the membrane washing mode, connect the raw water inlet and outlet of the inlet solenoid valve, close the flushing inlet of the inlet solenoid valve, connect the inlet and primary pure water outlet of the pure water diversion solenoid valve, close the secondary pure water outlet of the pure water diversion solenoid valve, the pure water produced by the reverse osmosis membrane filter element flows to the raw water inlet through the membrane washing valve and the primary filtrate outlet, the booster pump pumps the produced pure water and raw water into the reverse osmosis membrane filter element for membrane washing, the generated membrane washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element to the concentrate outlet, after the reverse osmosis membrane filter element has finished washing, open the pure water inlet / outlet and the pure water outlet 1 to enter the water production mode, and then close and disconnect the membrane washing valve and the primary filtrate outlet; Mode Six (Acid Washing Mode): Close the pure water inlet / outlet. Connect the membrane washing valve to the acid washing chemical loading device, then connect it to the post-ultrafiltration drain valve. Switch either the pure water outlet or the pressure relief solenoid valve. Low water pressure triggers the high-pressure switch to activate, starting the reverse osmosis filtration system into acid washing mode. Connect the raw water inlet and outlet of the inlet solenoid valve, close the flushing inlet of the inlet solenoid valve, connect the inlet and primary pure water outlet of the pure water diversion solenoid valve, and close the secondary pure water outlet of the pure water diversion solenoid valve. The reverse osmosis membrane filter element produces pure water, which flows into the acid washing device through the membrane washing valve to form acid washing solution. After acid washing the post-ultrafiltration module, the solution flows to the raw water inlet. The booster pump pumps the acid washing solution into the reverse osmosis membrane filter element for acid washing. The resulting acid washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element and flows to the concentrate outlet. After the acid washing mode is completed, the pure water storage port and the pure water outlet are opened to enter the water production mode. Then, the membrane washing valve and the post-ultrafiltration drain valve are closed and disconnected.

[0025] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, in the water production mode of the reverse osmosis filtration system, if the pure water TDS monitoring device detects that the TDS value of the produced pure water is abnormally high and reaches the standard of stagnant water, the flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, and the booster pump pumps the stagnant water into the reverse osmosis membrane filter element for further filtration. After the pure water TDS value returns to normal, the raw water inlet and outlet of the water inlet solenoid valve are connected, and the flushing inlet of the water inlet solenoid valve is closed. In the purification mode of the reverse osmosis filtration system, if the pure water TDS monitoring device detects that the TDS value of the produced secondary pure water is abnormally high and does not meet the secondary pure water standard, the inlet and the primary pure water outlet of the pure water diversion solenoid valve are connected, and the secondary pure water outlet of the pure water diversion solenoid valve is closed. The booster pump pumps the substandard secondary pure water into the reverse osmosis membrane filter element for further filtration. After the secondary pure water TDS value returns to normal, the inlet and the secondary pure water outlet of the pure water diversion solenoid valve are connected, and the primary pure water outlet of the pure water diversion solenoid valve is closed.

[0026] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the function of the concentrate diversion and recovery system includes: The reverse osmosis membrane pre-pressure monitoring device can monitor the reverse osmosis membrane pre-pressure, and adjust the size of the adjustable concentrate ratio valve and the adjustable recovery ratio valve according to the TDS value monitored by the concentrate TDS monitoring device, thereby adjusting the concentrate flow rate and the recovery water flow rate, controlling the reverse osmosis membrane pre-pressure, so that the reverse osmosis membrane filter element always works under appropriate pressure, and simultaneously adjusting the pure waste ratio during water production in a water-saving secondary purification ultrapure water system. When the TDS value detected by the concentrated water TDS monitoring device reaches the set concentrated water TDS value, the inlet and outlet of the concentrated water diversion solenoid valve are connected, and the recovery outlet of the concentrated water diversion solenoid valve is closed. The concentrated water entering the concentrated water diversion and recovery system from the recovery inlet flows to the concentrated water storage port and the recovery outlet. When the TDS value detected by the concentrate TDS monitoring device is lower than the set concentrate TDS value, the inlet and the recovery outlet of the concentrate diversion solenoid valve are connected, the drain outlet of the concentrate diversion solenoid valve is closed, and all the water entering the concentrate diversion recovery system from the recovery inlet flows to the recovery outlet. When the reverse osmosis filtration system is in water production mode, the concentrated water flowing to the recovery outlet in the concentrated water diversion and recovery system flows into the reverse osmosis filtration system for secondary filtration. In the zero-stagnant-water flushing mode and purification mode of the reverse osmosis filtration system, the water flowing to the recovery outlet in the concentrate diversion and recovery system is reversed and passed through the primary filtration system to backwash the coarse filtration module, the pre-ultrafiltration module, and the post-ultrafiltration module in the primary filtration system before being recovered and stored in the tap water area. In the membrane washing mode, the inlet and the recovery outlet of the concentrate flow solenoid valve are connected, the drain outlet of the concentrate flow solenoid valve is closed, the membrane washing water outlet is opened, and all the membrane washing water is discharged. The state of the discharged membrane washing water is used to determine whether the reverse osmosis membrane filter element has been washed. After the reverse osmosis membrane filter element has been washed, the membrane washing water outlet is closed. In the acid washing mode, the inlet and the recovery outlet of the concentrate flow solenoid valve are connected, the drain outlet of the concentrate flow solenoid valve is closed, and the recovery outlet is connected to the post-ultrafiltration drain valve. The recovered acid washing wastewater is used to circulate and acid wash the post-ultrafiltration module and the reverse osmosis membrane filter element. After the acid washing of the post-ultrafiltration module and the reverse osmosis membrane filter element is completed, the membrane washing water outlet is opened, all the acid washing wastewater is discharged, and the acid washing mode ends. When the wastewater reuse outlet is opened, the concentrated water in the concentrated water zone is driven by the water supply pressure from the tap water zone. The concentrated water discharged from the concentrated water inlet flows through the normally open side of the concentrated water four-way valve and the concentrated water reuse check valve to the wastewater reuse outlet. After the concentrated water zone is drained, the normally closed side of the concentrated water four-way valve is opened due to the pressure reduction on the normally open side of the concentrated water four-way valve. Water from the tap water inlet flows through the normally closed side of the concentrated water four-way valve to the wastewater reuse outlet.

[0027] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the functions of the multifunctional pressure vessel include: The tap water zone, the pure water zone, the concentrated water zone, and the secondary pure water zone can drive each other. When the external tap water supply is stable, the air pressure zone can release the gas through the valve core to make more usable space for other functional areas. When needed, the air pressure zone can be refilled through the valve core. When the external tap water supply is interrupted, the air pressure zone can drive other functional zones by releasing the stored pressure or filling with air. When the reverse osmosis filtration system is in zero-staple water flushing mode, the pure water used for flushing in the pure water zone will eventually be recycled and stored in the tap water zone. The tap water zone, the air pressure zone, and the pure water zone are each of the three functional zones, which can each expand to occupy the entire interior space of the multi-functional pressure vessel or be completely compressed to zero. The expansion of the secondary pure water zone and the concentrated water zone is limited.

[0028] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the raw water inlet of another structure of the reverse osmosis filtration system is sequentially connected to the raw water one-way valve and the raw water inlet of the inlet solenoid valve. The outlet of the inlet solenoid valve is sequentially connected to a booster pump, a reverse osmosis membrane filter element, a pure water TDS monitoring device, a reverse osmosis filter element water flow sensor, and a pure water one-way valve. The outlet of the pure water one-way valve is divided into three branches: the first branch is sequentially connected to a low-pressure switch, a zero-staple water flushing water flow sensor, a zero-staple water flushing one-way valve, and the flushing inlet of the inlet solenoid valve; the second branch is connected to a pure water storage port; and the third branch is sequentially connected to a water intake water flow sensor and a pressure-holding one-way valve. The outlet of the pressure-holding one-way valve is divided into three branches: the first branch is connected to a pure water outlet; the second branch is sequentially connected to a membrane washing one-way valve and a membrane washing valve; and the third branch is sequentially connected to a pressure relief proportional valve, a high-pressure switch, and a pressure relief solenoid valve. The primary pure water inlet of the secondary inlet solenoid valve is divided into two branches, one of which is connected to the outlet of the zero-staple water flushing one-way valve, and the other branch is connected to... The water replenishment check valve is connected to the reflux inlet of the secondary water inlet solenoid valve. The outlet of the secondary water inlet solenoid valve is sequentially connected to the secondary booster pump, the secondary reverse osmosis membrane filter element, and the secondary pure water TDS monitoring device. The outlet of the secondary pure water TDS monitoring device is divided into two branches. One branch is sequentially connected to the reflux check valve and the reflux inlet of the secondary water inlet solenoid valve. The other branch is sequentially connected to the secondary reverse osmosis filter element flow sensor and the secondary pure water check valve. The outlet of the secondary pure water check valve is divided into two branches. One branch is connected to the secondary pure water storage port. The other branch is sequentially connected to the secondary water intake flow sensor and the secondary pressure holding check valve. The outlet of the secondary pressure holding check valve is divided into two branches. One branch is connected to the secondary pure water outlet one. The other branch is sequentially connected to the secondary pressure relief proportional valve, the secondary high-pressure switch, and the secondary pressure relief solenoid valve. The concentrate port of the secondary reverse osmosis membrane filter element is sequentially connected to the secondary concentrate check valve and the inlet of the raw water check valve. The concentrate port of the reverse osmosis membrane filter element is sequentially connected to the concentrate check valve and the concentrate outlet.

[0029] Another embodiment of the reverse osmosis filtration system of a water-saving secondary purification ultrapure water system provided by the present invention includes the following mode: Mode 1 (Water Intake Mode): Same as Mode 1 of the reverse osmosis filtration system of the water-saving secondary purification ultrapure water system described in claim 3; Mode 2 (Water Production Mode): When the pure water outlet is opened, or the pressure relief solenoid valve is switched on and off, low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into water production mode. The raw water inlet and outlet of the water inlet solenoid valve are connected, and the flushing inlet of the water inlet solenoid valve is closed. The booster pump pumps the raw water into the reverse osmosis membrane filter element for filtration. The produced pure water flows out from the pure water port of the reverse osmosis membrane filter element and flows to the pure water storage port or the pure water outlet. The generated concentrated water flows out from the concentrated water port of the reverse osmosis membrane filter element and flows to the concentrated water outlet. After the pure water outlet is closed, the produced pure water is stored in the pure water zone. When the pure water zone is full, the pressure increases, triggering the high-pressure switch to turn off, and the water production mode of the reverse osmosis filtration system ends. Mode 3 (Zero Backwater Flushing Mode): After the reverse osmosis filtration system finishes its water production mode, it enters the zero backwater flushing mode. The flushing inlet and outlet of the inlet solenoid valve are connected, while the raw water inlet of the inlet solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter element and the pure water in the pure water zone flow to the inlet of the booster pump. The booster pump pumps the pure water into the reverse osmosis membrane filter element for zero backwater flushing, discharging the concentrated water inside the reverse osmosis membrane filter to avoid the generation of backwater. When the TDS value monitored by the concentrated water TDS monitoring device reaches the zero backwater flushing set value, the zero backwater flushing mode of the reverse osmosis filtration system ends, or it can be ended at any time as needed through the external control system. Mode 4 (Purification Mode): When the secondary pure water outlet is opened, or the secondary pressure relief solenoid valve is switched on and off, low water pressure triggers the secondary high-pressure switch to turn on, and the reverse osmosis filtration system enters the purification mode. The primary pure water inlet and outlet of the secondary water inlet solenoid valve are connected, and the reflux inlet of the secondary water inlet solenoid valve is closed. The secondary booster pump pumps the primary pure water into the secondary reverse osmosis membrane filter element for secondary purification. The resulting concentrate flows out from the concentrate outlet of the secondary reverse osmosis membrane filter element and flows to the inlet of the raw water one-way valve. The obtained secondary pure water flows to the secondary pure water storage port or to the secondary pure water outlet. After the secondary pure water outlet is closed, the obtained secondary pure water is stored in the secondary pure water zone. When the secondary pure water zone is full, the pressure increases, triggering the secondary high-pressure switch to turn off, and the purification mode of the reverse osmosis filtration system ends. Mode 5 (Membrane Washing Mode): Close the pure water inlet / outlet, connect the membrane washing valve to the primary filtrate outlet, switch the pure water outlet or the pressure relief solenoid valve, low water pressure triggers the high-pressure switch to turn on, start the reverse osmosis filtration system to enter the membrane washing mode, connect the raw water inlet and outlet of the inlet solenoid valve, close the flushing inlet of the inlet solenoid valve, the pure water produced by the reverse osmosis membrane filter element flows to the raw water inlet through the membrane washing valve and the primary filtrate outlet, the booster pump pumps the produced pure water and raw water into the reverse osmosis membrane filter element for membrane washing, and the generated membrane washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element to the concentrate outlet; Mode Six (Acid Washing Mode): The pure water inlet / outlet is closed. The membrane washing valve is connected to the acid washing chemical loading device and then to the post-ultrafiltration drain valve. The pure water outlet is switched on or off, or the pressure relief solenoid valve is switched on. Low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into acid washing mode. The raw water inlet and outlet of the water inlet solenoid valve are connected. The flushing inlet of the water inlet solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter element flows into the acid washing chemical loading device through the membrane washing valve to form acid washing solution. After acid washing the post-ultrafiltration module, it flows to the raw water inlet. The booster pump pumps the acid washing solution into the reverse osmosis membrane filter element for acid washing. The generated acid washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element and flows to the concentrate outlet.

[0030] According to another embodiment of the reverse osmosis filtration system of the water-saving secondary purification ultrapure water system provided by the present invention, in the water production mode, if the pure water TDS monitoring device detects that the TDS value of the produced pure water is abnormally high and reaches the standard of stagnant water, the flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, and the booster pump pumps the stagnant water into the reverse osmosis membrane filter element for further filtration. After the pure water TDS value returns to normal, the raw water inlet and outlet of the water inlet solenoid valve are connected, and the flushing inlet of the water inlet solenoid valve is closed. In the purification mode of the reverse osmosis filtration system, if the secondary pure water TDS monitoring device detects that the TDS value of the produced secondary pure water is abnormally high and does not meet the secondary pure water standard, the reflux inlet and outlet of the secondary water inlet solenoid valve are connected, and the primary pure water inlet of the secondary water inlet solenoid valve is closed. The substandard secondary pure water flows to the reflux inlet of the secondary water inlet solenoid valve through the reflux check valve, and the primary pure water flows to the reflux inlet of the secondary water inlet solenoid valve through the makeup water check valve. The secondary booster pump pumps the substandard secondary pure water into the secondary reverse osmosis membrane filter element for further filtration. After the secondary pure water TDS value returns to normal, the primary pure water inlet and outlet of the secondary water inlet solenoid valve are connected, and the reflux inlet of the secondary water inlet solenoid valve is closed.

[0031] According to the present invention, a water-saving secondary purification ultrapure water system is provided, wherein the inlet solenoid valve and the secondary inlet solenoid valve are two-position three-way solenoid valves with two inlets and one outlet, which can be replaced by a two-position normally closed solenoid valve and a two-position normally open solenoid valve connected in parallel at the outlet, or by a two-position four-way solenoid valve connected in parallel at the outlet; the concentrate flow solenoid valve and the pure water flow solenoid valve are two-position three-way solenoid valves with one inlet and two outlets, which can be replaced by a two-position normally closed solenoid valve and a two-position normally open solenoid valve connected in parallel at the inlet, or by a two-position four-way solenoid valve connected in parallel at the inlet.

[0032] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the tap water inlet, the tap water supply port, the primary filter inlet, the primary filter outlet, the primary filter direct outlet, the raw water inlet, the concentrated water outlet, the pure water outlet one, the pure water storage port, the secondary pure water outlet one, the secondary pure water storage port, the recovery inlet, the concentrated water storage port, the recovery outlet, the membrane washing water outlet, the tap water replenishment port, the wastewater recycling outlet, the tap water zone inlet / outlet, the concentrated water zone inlet / outlet, the pure water zone inlet / outlet, the secondary pure water zone inlet / outlet, the pure water outlet two, and the secondary pure water outlet two are all manually operated valves. Furthermore, the concentrated water zone inlet / outlet, the pure water zone inlet / outlet, and the secondary pure water zone inlet / outlet should be explosion-proof pressure relief manually operated valves.

[0033] According to an embodiment of the water-saving secondary purification ultrapure water system provided by the present invention, compared with the prior art, the present invention has the following beneficial effects: The secondary pure water obtained by the reverse osmosis filtration system can meet people's demand for high-quality drinking water. The reverse osmosis filtration system uses a zero-stagnant-water flushing mode to flush the reverse osmosis membrane with pure water, avoiding the generation of stagnant water. The reverse osmosis filtration system's zero-staple water flushing mode, in conjunction with the concentrate diversion and recovery system, backwashes the primary filtration system, extending the lifespan of the ultrafiltration module. The concentrated water diversion and recovery system recovers concentrated water through the concentrated water inlet and outlet, and then recycles it through the wastewater recycling outlet. After the concentrated water zone is drained, the water from the coarse filter drain valve, the pre-ultrafiltration drain valve, or the post-ultrafiltration drain valve flows to the tap water inlet and is recycled through the wastewater recycling outlet. The water-saving secondary purification ultrapure water system, during water production, uses the combined action of two adjustable proportional valves to ensure that the reverse osmosis membrane filter element always operates at an appropriate membrane inlet pressure and flow rate, while the pure waste ratio is adjustable. The use of the aforementioned multi-functional pressure vessel increases the water output speed; The reverse osmosis filtration system uses less water in its membrane washing mode. The acid washing mode of the reverse osmosis filtration system can remove scale that causes blockage of the post-ultrafiltration module and the reverse osmosis membrane filter element, thus extending their service life.

[0034] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the system connection of a water-saving secondary purification ultrapure water system according to the present invention; Figure 2 This is a schematic diagram of an embodiment of the tap water inlet system 001 of the water-saving secondary purification ultrapure water system of the present invention; Figure 3 This is a schematic diagram of an embodiment of the primary filtration system 002 of a water-saving secondary purification ultrapure water system of the present invention; Figure 4 This is a schematic diagram of an embodiment of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system of the present invention; Figure 5 This is a schematic diagram of an embodiment of the concentrate diversion and recovery system 004 of the water-saving secondary purification ultrapure water system of the present invention; Figure 6 This is a schematic diagram of an embodiment of a multifunctional pressure vessel 005 of a water-saving secondary purification ultrapure water system of the present invention; Figure 7 This is a schematic diagram of another embodiment of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system of the present invention; Figure 8 This is a schematic diagram of an embodiment of a solenoid valve replacement scheme for a water-saving secondary purification ultrapure water system according to the present invention.

[0037] Figure label: Water inlet system 001, primary filtration system 002, reverse osmosis filtration system 003, concentrate diversion and recovery system 004, multi-functional pressure vessel 005; Water inlet 101, water pressure reducing valve 102, water TDS monitoring device 103, water flow sensor 104, water supply outlet 105; 201 for primary filter inlet, 202 for coarse filter module, 203 for coarse filter drain valve, 204 for pre-ultrafiltration module, 205 for pre-ultrafiltration drain valve, 206 for activated carbon filter module, 207 for post-ultrafiltration module, 208 for post-ultrafiltration drain valve, 209 for primary filter outlet, 210 for direct primary filter water flow sensor, and 211 for direct primary filter water outlet. Raw water inlet 301, raw water check valve 302, booster pump 304, reverse osmosis membrane filter element 305, pure water TDS monitoring device 306, concentrate check valve 307, concentrate outlet 308, pure water check valve 311, zero stale water flushing check valve 312, water intake flow sensor 314, pressure holding check valve 315, high pressure switch 316, pure water outlet 317, pure water storage / access port 319, reverse osmosis filter element flow sensor 320, zero stale water flushing flow sensor 321, water inlet solenoid valve 324, membrane washing check valve 325, membrane washing valve 326, pressure relief solenoid valve 327, secondary pressure relief solenoid valve 3 28, Pressure relief proportional valve; 329, Secondary pressure relief proportional valve; 330, Low pressure switch; 331, Pure water flow solenoid valve; 332, Secondary pure water check valve; 333, Secondary pure water storage / access port; 334, Secondary water intake flow sensor; 335, Secondary pressure holding check valve; 336, Secondary pure water outlet; 337, Secondary high pressure switch; 338, Secondary water inlet solenoid valve; 339, Secondary booster pump; 340, Secondary reverse osmosis membrane filter element; 341, Secondary pure water TDS monitoring device; 342, Return check valve; 343, Make-up water check valve; 344, Secondary reverse osmosis filter element flow sensor; 345, Secondary concentrate check valve; 346. Recovery inlet 401, reverse osmosis membrane pre-pressure monitoring device 402, adjustable concentrate proportioning valve 403, concentrate TDS monitoring device 404, drainage flow sensor 406, recovery check valve 409, recovery outlet 410, membrane washing water outlet 411, adjustable recovery proportioning valve 412, concentrate diversion solenoid valve 413, drainage check valve 414, concentrate storage and access port 415, tap water replenishment port 416, normally open side of concentrate four-way valve 417, normally closed side of concentrate four-way valve 418, concentrate reuse check valve 419, wastewater reuse outlet 420. Tap water zone 501, air pressure zone 502, pure water zone 503, tap water zone inlet / outlet 504, pure water zone inlet / outlet 505, valve core 506, concentrated water zone 507, concentrated water zone inlet / outlet 508, secondary pure water zone 509, secondary pure water zone inlet / outlet 510, secondary pure water zone outlet 511, secondary pure water zone outlet check valve 512, secondary pure water zone flow sensor 513, secondary pure water outlet 2 514, pure water zone outlet 515, pure water zone outlet check valve 516, pure water zone flow sensor 517, pure water outlet 2 518; Two-position two-way normally closed solenoid valve 601, two-position two-way normally open solenoid valve 602, two-position four-way solenoid valve 603. Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] An example implementation of a water-saving secondary purification ultrapure water system provided by the present invention Figure 1 As shown, it includes: tap water inlet system 001, primary filtration system 002, reverse osmosis filtration system 003, concentrate diversion and recovery system 004, and multi-functional pressure vessel 005.

[0042] The present invention provides a water-saving secondary purification ultrapure water system with a tap water inlet system 001, for example. Figure 2 As shown, a water inlet 101, a water pressure reducing valve 102, a water TDS monitoring device 103, a water flow sensor 104, and a water supply outlet 105 are connected in sequence.

[0043] The present invention provides a primary filtration system 002 for a water-saving secondary purification ultrapure water system. Figure 3As shown, the system includes a pre-filtration inlet 201, a coarse filtration module 202, a pre-ultrafiltration module 204, an activated carbon filtration module 206, and a post-ultrafiltration module 207 connected in sequence. The post-ultrafiltration module 207 has two outlets, one of which is connected to the pre-filtration outlet 209, and the other is connected in sequence to the pre-filtration water flow sensor 210 and the pre-filtration water direct outlet 211. The drain port of the coarse filtration module 202 is connected to the coarse filtration drain valve 203, the drain port of the pre-ultrafiltration module 204 is connected to the pre-ultrafiltration drain valve 205, and the drain port of the post-ultrafiltration module 207 is connected to the post-ultrafiltration drain valve 208.

[0044] An example of an implementation of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system provided by the present invention. Figure 4 As shown, the raw water inlet 301 of the reverse osmosis filtration system 003 is sequentially connected to the raw water one-way valve 302 and the raw water inlet solenoid valve 324. The outlet of the inlet solenoid valve 324 is sequentially connected to the booster pump 304, the reverse osmosis membrane filter element 305, the pure water TDS monitoring device 306, the reverse osmosis filter element water flow sensor 320, and the inlet of the pure water diversion solenoid valve 332. The first-stage pure water outlet of the pure water diversion solenoid valve 332 is connected to the pure water one-way valve 311. The outlet of the pure water one-way valve 311 is divided into three branches. The first branch is sequentially connected to the low-pressure switch 331, the zero-staple water flushing water flow sensor 321, the zero-staple water flushing one-way valve 312, and the flushing inlet of the inlet solenoid valve 324. The second branch is connected to the pure water storage port 319. The third branch is connected to the water intake water flow sensor 314 and the pressure holding one-way valve 315. The outlet of the pressure holding one-way valve 315 is... The system is divided into three branches. The first branch connects to the pure water outlet 317, the second branch connects to the membrane washing check valve 325 and the membrane washing valve 326, and the third branch connects to the pressure relief proportional valve 329, the high-pressure switch 316, and the pressure relief solenoid valve 327 in sequence. The secondary pure water outlet of the pure water flow solenoid valve 332 is connected to the secondary pure water check valve 333. The outlet of the secondary pure water check valve 333 is divided into two branches. One branch connects to the secondary pure water storage port 334, and the other branch connects to the secondary water intake flow sensor 335 and the secondary pressure holding check valve 336 in sequence. The outlet of the secondary pressure holding check valve 336 is divided into two branches. One branch connects to the secondary pure water outlet 337, and the other branch connects to the secondary pressure relief proportional valve 330, the secondary high-pressure switch 338, and the secondary pressure relief solenoid valve 328 in sequence. The concentrate port of the reverse osmosis membrane filter element 305 is connected to the concentrate check valve 307 and the concentrate outlet 308 in sequence.

[0045] The present invention provides a concentrated water separation and recovery system for a water-saving secondary purification ultrapure water system. Example 004 Figure 5As shown, the system includes a recovery inlet 401, a reverse osmosis membrane pre-pressure monitoring device 402, and a concentrate TDS monitoring device 404 connected in sequence. The outlet of the concentrate TDS monitoring device 404 is divided into two branches. One branch is connected in sequence to the inlet of an adjustable concentrate proportioning valve 403 and a concentrate diversion solenoid valve 413. The other branch is connected to an adjustable recovery proportioning valve 412. The outlet of the adjustable recovery proportioning valve 412 is divided into three branches. The first branch is equipped with a recovery check valve 409 and a recovery outlet 410 connected in sequence. The second branch is connected to a membrane washing water outlet 411. The third branch is connected to the concentrate. The diversion solenoid valve 413 recovers the outlet 410. The outlet of the concentrate diversion solenoid valve 413 is provided with a drain flow sensor 406 and a drain check valve 414 connected in sequence. The outlet of the drain check valve 414 is divided into two branches. One branch is connected to the concentrate storage port 415, and the other branch is connected in sequence to the normally open side 417 of the concentrate four-way valve and the concentrate reuse check valve 419. The outlet of the concentrate reuse check valve 419 is divided into two branches. One branch is connected to the wastewater reuse outlet 420, and the other branch is connected in sequence to the normally closed side 418 of the concentrate four-way valve and the tap water supply port 416.

[0046] The present invention provides a multifunctional pressure vessel 005 for a water-saving secondary purification ultrapure water system. Figure 6 As shown, the system includes a concentrated water zone 507, a concentrated water zone inlet / outlet 508, a tap water zone 501, a tap water zone inlet / outlet 504, a pressure zone 502, a valve core 506, a pure water zone 503, a pure water zone inlet / outlet 505, a pure water zone outlet 515, a secondary pure water zone 509, a secondary pure water zone inlet / outlet 510, and a secondary pure water zone outlet 511. The pure water zone outlet 515 is sequentially connected to a pure water zone outlet check valve 516, a pure water zone flow sensor 517, and a second pure water outlet 518. The secondary pure water zone outlet 511 is sequentially connected to a secondary pure water zone outlet check valve 512, a secondary pure water zone flow sensor 513, and a second secondary pure water outlet 514.

[0047] A system connection diagram of an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention is shown below. Figure 1 As shown, the tap water inlet 101 is connected to the external tap water supply. The tap water supply outlet 105 is divided into two branches, one of which is connected to the tap water zone inlet 504, and the other is connected to the primary filter inlet 201. The primary filter outlet 209 is connected to the raw water inlet 301. The pure water storage port 319 is connected to the pure water zone inlet 505. The secondary pure water storage port 334 is connected to the secondary pure water zone inlet 510. The concentrated water outlet 308 is connected to the recovery inlet 401. The recovery outlet 410 is connected to the raw water inlet 301. The concentrated water storage port 415 is connected to the concentrated water zone inlet 508. The tap water replenishment port 416 is connected to the coarse filter drain valve 203, the pre-ultrafiltration drain valve 205, or the post-ultrafiltration drain valve 208.

[0048] The present invention provides a water-saving secondary purification ultrapure water system with a tap water inlet system 001, for example. Figure 2 As shown, the functions of the tap water inlet system 001 include: the inlet pressure reducing valve 102 reducing the water supply pressure, preventing backflow and providing a stable water supply pressure; the inlet TDS monitoring device 103 detecting the inlet TDS in conjunction with an external electronic control system; the inlet water flow sensor 104 detecting the flow rate and velocity of the inlet water in conjunction with an external electronic control system; and the tap water inlet system 001 supplying water to the primary filtration system 002 and the multifunctional pressure vessel 005.

[0049] The present invention provides a primary filtration system 002 for a water-saving secondary purification ultrapure water system. Figure 3 As shown, the primary filtration system 002 functions as follows: providing high-quality raw water to the reverse osmosis filtration system 003 through layer-by-layer filtration via the coarse filtration module 202, the pre-ultrafiltration module 204, the activated carbon filtration module 206, and the post-ultrafiltration module 207; providing users with high-quality, directly usable pre-filtered water through layer-by-layer filtration via the coarse filtration module 202, the pre-ultrafiltration module 204, the activated carbon filtration module 206, and the post-ultrafiltration module 207; the coarse filtration drain valve 203 can discharge wastewater from the coarse filtration module 202; the pre-ultrafiltration drain valve 205 can discharge wastewater from the pre-ultrafiltration module 204; the post-ultrafiltration drain valve 208 can discharge wastewater from the post-ultrafiltration module 207; and the pre-filtered water flow sensor 210, combined with an external electronic control system, can detect the flow rate and velocity of the pre-filtered water.

[0050] An example of an implementation of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system provided by the present invention. Figure 4 As shown, the following modes are included: Mode 1 (Water Intake Mode): When the second pure water outlet 518 is opened, the pure water zone 503 is driven by the water pressure from the tap water zone 501 to discharge pure water to the second pure water outlet 518. When the second secondary pure water outlet 514 is opened, the second secondary pure water zone 509 is driven by the water pressure from the tap water zone 501 to discharge secondary pure water to the second secondary pure water outlet 514. Due to the presence of the pressure-holding one-way valve 315 and the second secondary pressure-holding one-way valve 336, the high-pressure switch 316 and the second secondary high-pressure switch 338 are not triggered, and the reverse osmosis filtration system 003 is not started. The water intake flow sensor 314 and the second secondary water intake flow sensor 335, combined with the external electronic control system, can detect the flow rate and velocity of the pure water and the second secondary pure water. Mode 2 (Water Production Mode): When the pure water outlet 317 is opened, or the pressure relief solenoid valve 327 is switched on and off, low water pressure triggers the high-pressure switch 316 to turn on, starting the reverse osmosis filtration system 003 into water production mode. The raw water inlet 301 and its outlet of the water inlet solenoid valve 324 are connected, the flushing inlet of the water inlet solenoid valve 324 is closed, the inlet and its primary pure water outlet of the pure water diversion solenoid valve 332 are connected, the secondary pure water outlet of the pure water diversion solenoid valve 332 is closed, and the booster pump 304 pumps raw water into the system. The reverse osmosis membrane filter element 305 performs filtration, and the pure water produced flows out from the pure water outlet of the reverse osmosis membrane filter element 305 to the pure water storage port 319 or the pure water outlet 317. The concentrated water produced flows out from the concentrated water outlet of the reverse osmosis membrane filter element 305 to the concentrated water outlet 308. After the pure water outlet 317 is closed, the pure water produced is stored in the pure water zone 503. When the pure water zone 503 is full, the pressure increases, triggering the high-pressure switch 316 to disconnect, and the water production mode of the reverse osmosis filtration system 003 ends. Mode 3 (Zero Stagnant Water Flushing Mode): When the secondary pure water outlet 337 is opened, or the secondary pressure relief solenoid valve 328 is switched on and off, the low water pressure triggers the secondary high pressure switch 338 to turn on, and the reverse osmosis filtration system 003 enters the zero stagnant water flushing mode. The flushing inlet and outlet of the water inlet solenoid valve 324 are connected, the raw water inlet 301 of the water inlet solenoid valve 324 is closed, the inlet and primary pure water outlet of the pure water diversion solenoid valve 332 are connected, and the secondary pure water outlet of the pure water diversion solenoid valve 332 is closed. The pure water produced by the reverse osmosis membrane filter element 305 and the pure water in the pure water zone 503 flow to the inlet of the booster pump 304. The booster pump 304 pumps the pure water into the reverse osmosis membrane filter element 305 for zero stagnant water flushing, and discharges the concentrated water in the reverse osmosis membrane filter to avoid the generation of stagnant water. Mode 4 (Purification Mode): In the zero-staple water flushing mode, if the pure water TDS monitoring device 306 detects that the TDS value of the produced pure water reaches the secondary pure water standard, the zero-staple water flushing mode ends, and the reverse osmosis filtration system 003 enters the purification mode. The flushing inlet and outlet of the inlet solenoid valve 324 are connected, the raw water inlet 301 of the inlet solenoid valve 324 is closed, the inlet and secondary pure water outlet of the pure water diversion solenoid valve 332 are connected, and the primary pure water outlet of the pure water diversion solenoid valve 332 is closed. The pressurization... Pump 304 pumps pure water into the reverse osmosis membrane filter element 305 for secondary purification. The resulting concentrated water flows out from the concentrated water outlet of the reverse osmosis membrane filter element 305 and flows to the concentrated water outlet 308. The resulting secondary pure water flows to the secondary pure water storage port 334 or to the secondary pure water outlet 337. After the secondary pure water outlet 337 is closed, the resulting secondary pure water is stored in the secondary pure water zone 509. When the secondary pure water zone 509 is full, the pressure increases, triggering the secondary high-pressure switch 338 to open, and the purification mode of the reverse osmosis filtration system 003 ends. Mode 5 (Membrane Washing Mode): Close the pure water inlet / outlet 319, connect the membrane washing valve 326 to the primary filtered water outlet 211, switch the pure water outlet 317 or the pressure relief solenoid valve 327, low water pressure triggers the high-pressure switch 316 to turn on, start the reverse osmosis filtration system 003 into membrane washing mode, connect the raw water inlet 301 and its outlet of the water inlet solenoid valve 324, close the flushing inlet of the water inlet solenoid valve 324, connect the inlet and its primary pure water outlet of the pure water diversion solenoid valve 332, and close the secondary pure water outlet of the pure water diversion solenoid valve 332. The pure water produced by the reverse osmosis membrane filter element 305 flows to the raw water inlet 301 through the membrane washing valve 326 and the primary filtrate outlet 211. The booster pump 304 pumps the produced pure water and raw water into the reverse osmosis membrane filter element 305 for membrane washing. The generated membrane washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element 305 and flows to the concentrate outlet 308. After the reverse osmosis membrane filter element 305 has finished washing, the pure water storage port 319 and the pure water outlet 317 are opened to enter the water production mode. Then the membrane washing valve 326 and the primary filtrate outlet 211 are closed and disconnected. Mode Six (Acid Washing Mode): Close the pure water inlet / outlet 319. The membrane washing valve 326 is connected to the acid washing chemical loading device and then to the post-ultrafiltration drain valve 208. Switch the pure water outlet 317 or the pressure relief solenoid valve 327. Low water pressure triggers the high-pressure switch 316 to turn on, starting the reverse osmosis filtration system 003 into acid washing mode. The raw water inlet 301 and its outlet of the water inlet solenoid valve 324 are connected. The flushing inlet of the water inlet solenoid valve 324 is closed. The inlet and its primary pure water outlet of the pure water diversion solenoid valve 332 are connected. The secondary pure water outlet of the pure water diversion solenoid valve 332 is closed. When closed, the pure water produced by the reverse osmosis membrane filter element 305 flows into the acid washing container through the membrane washing valve 326 to form acid washing solution. After acid washing the post-ultrafiltration module 207, it flows to the raw water inlet 301. The booster pump 304 pumps the acid washing solution into the reverse osmosis membrane filter element 305 for acid washing. The generated acid washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element 305 and flows to the concentrate outlet 308. After the acid washing mode is completed, the pure water storage port 319 and the pure water outlet 317 are opened to enter the water production mode. Then, the membrane washing valve 326 and the post-ultrafiltration drain valve 208 are closed and disconnected.

[0051] The reverse osmosis filtration system 003 of an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention is as follows: Figure 4 As shown, in water production mode, if the pure water TDS monitoring device 306 detects that the TDS value of the produced pure water is abnormally high and reaches the standard for aged water, the flushing inlet and outlet of the water inlet solenoid valve 324 are connected, the raw water inlet 301 of the water inlet solenoid valve 324 is closed, and the booster pump 304 pumps the aged water into the reverse osmosis membrane filter element 305 for further filtration. After the pure water TDS value is normal, the raw water inlet 301 and outlet of the water inlet solenoid valve 324 are connected, and the flushing inlet of the water inlet solenoid valve 324 is closed. If the TDS value of the pure water to be produced is high for a long time, it indicates that the reverse osmosis membrane filter element 305 is faulty or the concentrate diversion and recovery system 004 is faulty. In the purification mode of the reverse osmosis filtration system 003, if the pure water TDS monitoring device 306 detects that the TDS value of the produced secondary pure water is abnormally high and does not meet the secondary pure water standard, the inlet of the pure water diversion solenoid valve 332 and its primary pure water outlet are connected, and the secondary pure water outlet of the pure water diversion solenoid valve 332 is closed. The booster pump 304 pumps the substandard secondary pure water into the reverse osmosis membrane filter element 305 for further filtration. After the secondary pure water TDS value returns to normal, the inlet of the pure water diversion solenoid valve 332 and its secondary pure water outlet are connected, and the primary pure water outlet of the pure water diversion solenoid valve 332 is closed.

[0052] The present invention provides a concentrated water separation and recovery system for a water-saving secondary purification ultrapure water system. Example 004 Figure 5 As shown, the functions of the concentrate diversion and recovery system 004 include: The reverse osmosis membrane inlet pressure monitoring device 402 can monitor the reverse osmosis membrane inlet pressure, and adjust the size of the adjustable concentrate ratio valve 403 and the adjustable recovery ratio valve 412 according to the TDS value monitored by the concentrate TDS monitoring device 404, thereby adjusting the concentrate flow rate and the recovery water flow rate, controlling the reverse osmosis membrane inlet pressure, so that the reverse osmosis membrane filter element 305 always works under appropriate pressure, and at the same time adjusting the pure waste ratio during water production in a water-saving secondary purification ultrapure water system; When the TDS value detected by the concentrate TDS monitoring device 404 reaches the set concentrate TDS value, the inlet and outlet of the concentrate diversion solenoid valve 413 are connected, and the recovery outlet 410 of the concentrate diversion solenoid valve 413 is closed. The concentrate that enters the concentrate diversion and recovery system 004 from the recovery inlet 401 flows to the concentrate storage port 415 and the recovery outlet 410. When the TDS value detected by the concentrate TDS monitoring device 404 is lower than the set concentrate TDS value, the inlet of the concentrate diversion solenoid valve 413 and its recovery outlet 410 are connected, the drain outlet of the concentrate diversion solenoid valve 413 is closed, and all the water entering the concentrate diversion and recovery system 004 from the recovery inlet 401 flows to the recovery outlet 410. The drainage flow sensor 406, combined with an external electronic control system, can detect the flow rate and velocity of the drainage water. When the reverse osmosis filtration system 003 is in water production mode, the concentrated water flowing to the recovery outlet 410 in the concentrated water diversion and recovery system 004 flows into the reverse osmosis filtration system 003 for secondary filtration. In the zero-stagnant-water flushing mode and purification mode of the reverse osmosis filtration system 003, the water flowing from the concentrate diversion and recovery system 004 to the recovery outlet 410 is reversed through the primary filtration system 002, and the water is backwashed and then recycled into the tap water area 501 after backwashing the coarse filtration module 202, the pre-ultrafiltration module 204, and the post-ultrafiltration module 207 in the primary filtration system 002. In the membrane washing mode, the inlet and the recovery outlet 410 of the concentrate diversion solenoid valve 413 are connected, the drain outlet of the concentrate diversion solenoid valve 413 is closed, the membrane washing water outlet 411 is opened, and all the membrane washing water is discharged. The state of the discharged membrane washing water determines whether the reverse osmosis membrane filter element 305 has finished washing. After the reverse osmosis membrane filter element 305 has finished washing, the membrane washing water outlet 411 is closed. In the acid washing mode, the inlet of the concentrate diversion solenoid valve 413 and its recovery outlet 410 are connected, the drain outlet of the concentrate diversion solenoid valve 413 is closed, and the recovery outlet 410 is connected to the post-ultrafiltration drain valve 208. The recovered acid washing wastewater is used to circulate and acid wash the post-ultrafiltration module 207 and the reverse osmosis membrane filter element 305. After the acid washing of the post-ultrafiltration module 207 and the reverse osmosis membrane filter element 305 is completed, the membrane washing water outlet 411 is opened, all the acid washing wastewater is discharged, and the acid washing mode ends. When the wastewater reuse outlet 420 is opened, the concentrated water in the concentrated water zone 507 is driven by the water supply pressure of the tap water zone 501. The concentrated water discharged from the concentrated water inlet 415 flows through the normally open side 417 of the concentrated water four-way valve and the concentrated water reuse check valve 419 to the wastewater reuse outlet 420. After the concentrated water zone 507 is drained, the pressure on the normally open side 417 of the concentrated water four-way valve decreases, and the normally closed side 418 of the concentrated water four-way valve is opened. Water from the tap water replenishment port 416 flows through the normally closed side 418 of the concentrated water four-way valve to the wastewater reuse outlet 420.

[0053] The present invention provides a multifunctional pressure vessel 005 for a water-saving secondary purification ultrapure water system. Figure 6 As shown, the functions of the multifunctional pressure vessel 005 include: The tap water zone 501, the pure water zone 503, the concentrated water zone 507, and the secondary pure water zone 509 can drive each other. When the external tap water supply is stable, the air pressure zone 502 can release the gas through the valve core 506 to make more usable space for other functional areas. When needed, it can be refilled through the valve core 506. When the external tap water supply is interrupted, the air pressure zone 502 can drive other functional zones by releasing the stored pressure or filling with air. When the reverse osmosis filtration system 003 is in zero-staple water flushing mode, the pure water used for flushing in the pure water zone 503 will eventually be recycled and stored in the tap water zone 501. The tap water zone 501, the air pressure zone 502, and the pure water zone 503 can each expand to occupy the entire space inside the multifunctional pressure vessel 005 or be completely compressed to zero. The expansion of the secondary pure water zone 509 and the concentrated water zone 507 is limited.

[0054] Another embodiment of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system provided by the present invention is as follows: Figure 7As shown, the raw water inlet 301 is sequentially connected to the raw water one-way valve 302 and the raw water inlet solenoid valve 324. The outlet of the inlet solenoid valve 324 is sequentially connected to the booster pump 304, the reverse osmosis membrane filter element 305, the pure water TDS monitoring device 306, the reverse osmosis filter element water flow sensor 320, and the pure water one-way valve 311. The outlet of the pure water one-way valve 311 is divided into three branches. The first branch is sequentially connected to the low-pressure switch 331, the zero-staple water flushing water flow sensor 321, the zero-staple water flushing one-way valve 312, and the flushing inlet of the inlet solenoid valve 324. The second branch is connected to the pure water inlet 314. The water inlet 319 is connected in sequence to a water flow sensor 314 and a pressure-holding check valve 315. The outlet of the pressure-holding check valve 315 is divided into three branches: the first branch is connected to the pure water outlet 317; the second branch is connected in sequence to the membrane washing check valve 325 and the membrane washing valve 326; and the third branch is connected in sequence to the pressure relief proportional valve 329, the high-pressure switch 316, and the pressure relief solenoid valve 327. The primary pure water inlet of the secondary water inlet solenoid valve 339 is divided into two branches: one branch is connected to the outlet of the zero-staple water flushing check valve 312, and the other branch is connected to the secondary water inlet solenoid valve through the water replenishment check valve 344. The return inlet of the secondary water inlet solenoid valve 339 is connected in sequence to the secondary booster pump 340, the secondary reverse osmosis membrane filter element 341, and the secondary pure water TDS monitoring device 342. The outlet of the secondary pure water TDS monitoring device 342 is divided into two branches. One branch is connected in sequence to the return one-way valve 343 and the return inlet of the secondary water inlet solenoid valve 339. The other branch is connected in sequence to the secondary reverse osmosis filter element water flow sensor 345 and the secondary pure water one-way valve 333. The outlet of the secondary pure water one-way valve 333 is divided into two branches. One branch is connected to the secondary pure water storage / access port 3. 34. Another branch is connected in sequence to the secondary water intake flow sensor 335 and the secondary pressure holding one-way valve 336. The outlet of the secondary pressure holding one-way valve 336 is divided into two branches. One branch is connected to the secondary pure water outlet 337, and the other branch is connected in sequence to the secondary pressure relief proportional valve 330, the secondary high pressure switch 338, and the secondary pressure relief solenoid valve 328. The concentrate port of the secondary reverse osmosis membrane filter element 341 is connected in sequence to the secondary concentrate one-way valve 346 and the inlet of the raw water one-way valve 302. The concentrate port of the reverse osmosis membrane filter element 305 is connected in sequence to the concentrate one-way valve 307 and the concentrate outlet 308.

[0055] Another embodiment of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system provided by the present invention is as follows: Figure 7 As shown, the following modes are included: Mode 1 (Water Intake Mode): Same as Mode 1 of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system described in claim 3; Mode Two (Water Production Mode): When the pure water outlet 317 is opened, or the pressure relief solenoid valve 327 is switched on and off, low water pressure triggers the high-pressure switch 316 to turn on, starting the reverse osmosis filtration system 003 into water production mode. The raw water inlet 301 and its outlet of the water inlet solenoid valve 324 are connected, while the flushing inlet of the water inlet solenoid valve 324 is closed. The booster pump 304 pumps the raw water into the reverse osmosis membrane filter element 305 for filtration, and the resulting pure water is then discharged from the system. The pure water flows out of the reverse osmosis membrane filter element 305 and flows to the pure water storage port 319 or the pure water outlet 317. The concentrated water produced flows out from the concentrated water port of the reverse osmosis membrane filter element 305 and flows to the concentrated water outlet 308. After the pure water outlet 317 is closed, the produced pure water is stored in the pure water zone 503. After the pure water zone 503 is full, the pressure increases, triggering the high-pressure switch 316 to open, and the water production mode of the reverse osmosis filtration system 003 ends. Mode 3 (Zero Stagnant Water Flushing Mode): After the reverse osmosis filtration system 003 finishes its water production mode, it enters the zero stagnant water flushing mode. The flushing inlet and outlet of the inlet solenoid valve 324 are connected, while the raw water inlet 301 of the inlet solenoid valve 324 is closed. The pure water produced by the reverse osmosis membrane filter element 305 and the pure water in the pure water zone 503 flow to the inlet of the booster pump 304. The booster pump 304 pumps the pure water into the reverse osmosis membrane filter element 305 for zero stagnant water flushing, discharging the concentrated water inside the reverse osmosis membrane filter to avoid the generation of stagnant water. When the TDS value monitored by the concentrated water TDS monitoring device 404 reaches the zero stagnant water flushing set value, the zero stagnant water flushing mode of the reverse osmosis filtration system 003 ends, or it can be ended at any time as needed through the external control system. Mode 4 (Purification Mode): When the secondary pure water outlet 337 is opened, or the secondary pressure relief solenoid valve 328 is switched on or off, low water pressure triggers the secondary high-pressure switch 338 to turn on, and the reverse osmosis filtration system 003 enters the purification mode. The primary pure water inlet and outlet of the secondary water inlet solenoid valve 339 are connected, and the reflux inlet of the secondary water inlet solenoid valve 339 is closed. The secondary booster pump 340 pumps the primary pure water into the secondary reverse osmosis membrane filter element 341 for secondary purification, producing... The concentrated water flows out from the concentrated water port of the secondary reverse osmosis membrane filter element 341 and flows to the inlet of the raw water one-way valve 302. The resulting secondary pure water flows to the secondary pure water storage port 334 or to the secondary pure water outlet 337. After the secondary pure water outlet 337 is closed, the resulting secondary pure water is stored in the secondary pure water zone 509. When the secondary pure water zone 509 is full, the pressure increases, triggering the secondary high-pressure switch 338 to open, and the purification mode of the reverse osmosis filtration system 003 ends. Mode 5 (Membrane Washing Mode): Close the pure water inlet 319, connect the membrane washing valve 326 to the primary filtrate outlet 211, switch the pure water outlet 317 or the pressure relief solenoid valve 327, low water pressure triggers the high pressure switch 316 to turn on, start the reverse osmosis filtration system 003 to enter the membrane washing mode, the raw water inlet 301 and its outlet of the water inlet solenoid valve 324 are connected, the flushing inlet of the water inlet solenoid valve 324 is closed, the pure water produced by the reverse osmosis membrane filter element 305 flows to the raw water inlet 301 through the membrane washing valve 326 and the primary filtrate outlet 211, the booster pump 304 pumps the produced pure water and raw water into the reverse osmosis membrane filter element 305 for membrane washing, and the generated membrane washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element 305 to the concentrate outlet 308; Mode 6 (Acid Washing Mode): Close the pure water inlet 319. The membrane washing valve 326 is connected to the acid washing chemical loading device and then to the post-ultrafiltration drain valve 208. Switch the pure water outlet 317 or the pressure relief solenoid valve 327. Low water pressure triggers the high-pressure switch 316 to turn on, starting the reverse osmosis filtration system 003 into acid washing mode. The raw water inlet 301 and its outlet of the water inlet solenoid valve 324 are connected. The flushing inlet of the water inlet solenoid valve 324 is closed. The pure water produced by the reverse osmosis membrane filter element 305 flows into the acid washing chemical loading device through the membrane washing valve 326 to form acid washing solution. After acid washing the post-ultrafiltration module 207, it flows to the raw water inlet 301. The booster pump 304 pumps the acid washing solution into the reverse osmosis membrane filter element 305 for acid washing. The generated acid washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element 305 and flows to the concentrate outlet 308.

[0056] An embodiment of another structure of the reverse osmosis filtration system 003 of the water-saving secondary purification ultrapure water system provided by the present invention is as follows: Figure 7 As shown, in water production mode, if the pure water TDS monitoring device 306 detects that the TDS value of the produced pure water is abnormally high and reaches the standard for aged water, the flushing inlet and outlet of the water inlet solenoid valve 324 are connected, the raw water inlet 301 of the water inlet solenoid valve 324 is closed, and the booster pump 304 pumps the aged water into the reverse osmosis membrane filter element 305 for further filtration. After the pure water TDS value returns to normal, the raw water inlet 301 and outlet of the water inlet solenoid valve 324 are connected, and the flushing inlet of the water inlet solenoid valve 324 is closed. In the purification mode of the reverse osmosis filtration system 003, if the secondary pure water TDS monitoring device 342 detects that the TDS value of the produced secondary pure water is abnormally high and does not meet the secondary pure water standard, the reflux inlet and outlet of the secondary water inlet solenoid valve 339 are connected, and the primary pure water inlet of the secondary water inlet solenoid valve 339 is closed. The substandard secondary pure water flows to the reflux inlet of the secondary water inlet solenoid valve 339 through the reflux check valve 343, and the primary pure water flows to the reflux inlet of the secondary water inlet solenoid valve 339 through the makeup water check valve 344. The secondary booster pump 340 pumps the substandard secondary pure water into the secondary reverse osmosis membrane filter element 341 for further filtration. After the secondary pure water TDS value returns to normal, the primary pure water inlet and outlet of the secondary water inlet solenoid valve 339 are connected, and the reflux inlet of the secondary water inlet solenoid valve 339 is closed.

[0057] An example implementation of the solenoid valve replacement scheme for a water-saving secondary purification ultrapure water system provided by this invention. Figure 8 As shown, the water inlet solenoid valve 324 and the secondary water inlet solenoid valve 339 are two-position three-way solenoid valves with two inlets and one outlet. Their functions can be replaced by a two-position two-normally closed solenoid valve 601 and a two-position two-normally open solenoid valve 602 connected in parallel at the outlet, or by a two-position four-way solenoid valve 603 connected in parallel at the outlet. The concentrate flow solenoid valve 413 and the pure water flow solenoid valve 332 are two-position three-way solenoid valves with one inlet and two outlets. Their functions can be replaced by a two-position two-normally closed solenoid valve 601 and a two-position two-normally open solenoid valve 602 connected in parallel at the inlet, or by a two-position four-way solenoid valve 603 connected in parallel at the inlet.

[0058] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, when the water intake is small, the pure water outlet 2 518 or the secondary pure water outlet 2 514 is used; when the water intake is large, or when there is little pure water in the pure water zone 503 or little secondary pure water in the secondary pure water zone 509, the pure water outlet 1 317 or the secondary pure water outlet 1 337 is used.

[0059] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the raw water check valve 302, the concentrated water check valve 307, the pure water check valve 311, the zero-staple water flushing check valve 312, the secondary pure water check valve 333, the pure water zone outlet check valve 516, the secondary pure water zone outlet check valve 512, the pressure holding check valve 315, the secondary pressure holding check valve 336, the water replenishment check valve 344, the return check valve 343, the secondary concentrated water check valve 346, the recovery check valve 409, the drainage check valve 414, and the concentrated water reuse check valve 419 are designed to prevent backflow. The omission of these check valves in the water-saving secondary purification ultrapure water system provided by the present invention is not considered an optimization of the present invention.

[0060] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the data obtained by the inlet water TDS monitoring device 103, the pure water TDS monitoring device 306, the secondary pure water TDS monitoring device 342, the concentrate TDS monitoring device 404, the reverse osmosis membrane pre-pressure monitoring device 402, the inlet water flow sensor 104, the direct outlet primary filtration water flow sensor 210, the intake water flow sensor 314, the secondary intake water flow sensor 335, the reverse osmosis filter element flow sensor 320, the secondary reverse osmosis filter element flow sensor 345, the zero stagnant water flushing water flow sensor 321, the drainage water flow sensor 406, the pure water zone flow sensor 517, and the secondary pure water zone flow sensor 513 can be conveniently viewed and managed by the user.

[0061] According to an embodiment of a water-saving secondary purification ultrapure water system provided by the present invention, the system includes: a tap water inlet 101, a tap water supply outlet 105, a primary filter inlet 201, a primary filter outlet 209, a primary filter direct outlet 211, a raw water inlet 301, a concentrated water outlet 308, a pure water outlet 317, a pure water storage / access port 319, a secondary pure water outlet 337, a secondary pure water storage / access port 334, a recovery inlet 401, a concentrated water storage / access port 415, and a recovery outlet. 410. The membrane washing water outlet 411, the tap water replenishment port 416, the wastewater recycling outlet, the tap water zone inlet / outlet 504, the concentrated water zone inlet / outlet 508, the pure water zone inlet / outlet 505, the secondary pure water zone inlet / outlet 510, the second pure water outlet 518, and the second secondary pure water outlet 514 are all manually operated valves. Furthermore, the concentrated water zone inlet / outlet 508, the pure water zone inlet / outlet 505, and the secondary pure water zone inlet / outlet 510 should be explosion-proof pressure relief manually operated valves.

[0062] According to an embodiment of the water-saving secondary purification ultrapure water system provided by the present invention, compared with the prior art, the present invention has the following beneficial effects: The secondary pure water obtained by the reverse osmosis filtration system in purification mode 003 can meet people's demand for high-quality drinking water. The reverse osmosis filtration system's 003 zero-stagnant-water flushing mode uses pure water to flush the reverse osmosis membrane, avoiding the generation of stagnant water. The reverse osmosis filtration system 003 in zero-staple water flushing mode, in conjunction with the concentrate diversion and recovery system 004, backwashes the primary filtration system, extending the lifespan of the ultrafiltration module. The concentrated water diversion and recovery system 004 recovers concentrated water through the concentrated water inlet 415 and then recycles it through the wastewater recycling outlet. After the concentrated water zone 507 is drained, the water from the coarse filter drain valve 203, the pre-ultrafiltration drain valve 205, or the post-ultrafiltration drain valve 208 flows to the tap water inlet 416 and is recycled through the wastewater recycling outlet. The water-saving secondary purification ultrapure water system, during water production, uses the combined action of two adjustable proportional valves to ensure that the reverse osmosis membrane filter element 305 always operates at an appropriate membrane inlet pressure and flow rate, while the pure waste ratio is adjustable. The use of the multi-functional pressure vessel 005 improves the water output speed; The reverse osmosis filtration system in membrane washing mode 003 uses less water. The acid washing mode 003 of the reverse osmosis filtration system can remove scale that causes blockage of the post-ultrafiltration module 207 and the reverse osmosis membrane filter element 305, thus extending their service life.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0064] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-saving secondary purification ultrapure water system, comprising a tap water inlet system, a primary filtration system, a reverse osmosis filtration system, a concentrate diversion and recovery system, and a multi-functional pressure vessel, characterized in that: The tap water inlet system is provided with a tap water inlet, a water pressure reducing valve, a water TDS monitoring device, a water flow sensor, and a tap water supply port connected in sequence. The primary filtration system is provided with a primary filter inlet, a coarse filter module, a pre-ultrafiltration module, an activated carbon filter module, and a post-ultrafiltration module connected in sequence. The outlet of the post-ultrafiltration module is divided into two branches, one of which is connected to the primary filter outlet, and the other is connected in sequence to the primary filter water flow sensor and the primary filter water direct outlet. The drain port of the coarse filter module is connected to the coarse filter drain valve, the drain port of the pre-ultrafiltration module is connected to the pre-ultrafiltration drain valve, and the drain port of the post-ultrafiltration module is connected to the post-ultrafiltration drain valve. The raw water inlet of the reverse osmosis filtration system is sequentially connected to the raw water check valve and the raw water inlet of the inlet solenoid valve. The outlet of the inlet solenoid valve is sequentially connected to the booster pump, reverse osmosis membrane filter element, pure water TDS monitoring device, reverse osmosis filter element flow sensor, and the inlet of the pure water diversion solenoid valve. The first-stage pure water outlet of the pure water diversion solenoid valve is connected to the pure water check valve. The outlet of the pure water check valve is divided into three branches: the first branch is sequentially connected to the low-pressure switch, the zero-stagnant water flushing flow sensor, the zero-stagnant water flushing check valve, and the flushing inlet of the inlet solenoid valve; the second branch is connected to the pure water storage / access port; and the third branch is connected to the water intake flow sensor and the pressure-holding check valve. The outlet of the pressure-holding check valve is divided into three branches. The first branch connects to the pure water outlet 1, the second branch connects to the membrane washing check valve and the membrane washing valve, and the third branch connects in sequence to the pressure relief proportional valve, the high-pressure switch, and the pressure relief solenoid valve. The secondary pure water outlet of the pure water flow solenoid valve is connected to the secondary pure water check valve. The outlet of the secondary pure water check valve is divided into two branches, one of which is connected to the secondary pure water storage port, and the other branch is connected in sequence to the secondary water intake flow sensor and the secondary pressure holding check valve. The outlet of the secondary pressure holding check valve is divided into two branches, one of which is connected to the secondary pure water outlet 1, and the other branch is connected in sequence to the secondary pressure relief proportional valve, the secondary high-pressure switch, and the secondary pressure relief solenoid valve. The concentrate port of the reverse osmosis membrane filter element is connected in sequence to the concentrate check valve and the concentrate outlet. The concentrate diversion and recovery system is provided with a recovery inlet, a reverse osmosis membrane pre-pressure monitoring device, and a concentrate TDS monitoring device connected in sequence. The outlet of the concentrate TDS monitoring device is divided into two branches. One branch is connected in sequence to the inlet of the adjustable concentrate proportional valve and the concentrate diversion solenoid valve. The other branch is connected to the adjustable recovery proportional valve. The outlet of the adjustable recovery proportional valve is divided into three branches. The first branch is provided with a recovery check valve and a recovery outlet connected in sequence. The second branch is connected to the membrane washing water outlet. The third branch is connected to the recovery outlet of the concentrate diversion solenoid valve. The drain outlet of the concentrate diversion solenoid valve is provided with a drain flow sensor and a drain check valve connected in sequence. The outlet of the drain check valve is divided into two branches. One branch is connected to the concentrate storage port. The other branch is connected in sequence to the normally open side of the concentrate four-way valve and the concentrate reuse check valve. The outlet of the concentrate reuse check valve is divided into two branches. One branch is connected to the wastewater reuse outlet. The other branch is connected in sequence to the normally closed side of the concentrate four-way valve and the tap water supply port. The multifunctional pressure vessel is provided with a concentrated water zone, a concentrated water zone inlet / outlet, a tap water zone, a tap water zone inlet / outlet, a pressure zone, a valve core, a pure water zone, a pure water zone inlet / outlet, a pure water zone outlet, a secondary pure water zone, a secondary pure water zone inlet / outlet, and a secondary pure water zone outlet. The pure water zone outlet is sequentially connected to a pure water zone outlet check valve, a pure water zone flow sensor, and a second pure water outlet. The secondary pure water zone outlet is sequentially connected to a secondary pure water zone outlet check valve, a secondary pure water zone flow sensor, and a second secondary pure water outlet.

2. The water-saving secondary purification ultrapure water system according to claim 1, characterized in that, The tap water inlet is connected to the external tap water supply. The tap water supply outlet is divided into two branches, one of which is connected to the tap water zone inlet and the other is connected to the primary filter inlet. The primary filter outlet is connected to the raw water inlet. The pure water storage port is connected to the pure water zone inlet and outlet. The secondary pure water storage port is connected to the secondary pure water zone inlet and outlet. The concentrated water outlet is connected to the recovery inlet. The recovery outlet is connected to the raw water inlet. The concentrated water storage port is connected to the concentrated water zone inlet and outlet. The tap water replenishment port is connected to the coarse filter drain valve, the pre-ultrafiltration drain valve, or the post-ultrafiltration drain valve.

3. The water-saving secondary purification ultrapure water system according to claim 1, characterized in that, Includes the following modes: Mode 1 (Water Intake Mode): When the second pure water outlet is opened, the pure water zone is driven by the water pressure of the tap water zone to discharge pure water to the second pure water outlet. When the second secondary pure water outlet is opened, the secondary pure water zone is driven by the water pressure of the tap water zone to discharge secondary pure water to the second secondary pure water outlet. Mode 2 (Water Production Mode): When the pure water outlet is opened, or the pressure relief solenoid valve is switched on and off, low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into water production mode. The raw water inlet and outlet of the inlet solenoid valve are connected, the flushing inlet of the inlet solenoid valve is closed, the inlet and primary pure water outlet of the pure water diversion solenoid valve are connected, and the secondary pure water outlet of the pure water diversion solenoid valve is closed. The booster pump pumps raw water into the reverse osmosis membrane filter element for filtration. The produced pure water flows out from the pure water port of the reverse osmosis membrane filter element and flows to the pure water storage port or the pure water outlet. The generated concentrated water flows out from the concentrated water port of the reverse osmosis membrane filter element and flows to the concentrated water outlet. After the pure water outlet is closed, the produced pure water is stored in the pure water zone. When the pure water zone is full, the pressure increases, triggering the high-pressure switch to turn off, and the water production mode of the reverse osmosis filtration system ends. Mode 3 (Zero Stagnant Water Flushing Mode): When the secondary pure water outlet is opened, or the secondary pressure relief solenoid valve is switched on and off, low water pressure triggers the secondary high-pressure switch to turn on, and the reverse osmosis filtration system enters the zero stagnant water flushing mode. The flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, the inlet and primary pure water outlet of the pure water diversion solenoid valve are connected, and the secondary pure water outlet of the pure water diversion solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter element and the pure water in the pure water zone flow to the inlet of the booster pump. The booster pump pumps the pure water into the reverse osmosis membrane filter element for zero stagnant water flushing, and discharges the concentrated water in the reverse osmosis membrane filter element to avoid the generation of stagnant water. Mode 4 (Purification Mode): In the zero-wash water flushing mode, if the pure water TDS monitoring device detects that the TDS value of the produced pure water reaches the secondary pure water standard, the zero-wash water flushing mode ends, and the reverse osmosis filtration system enters the purification mode. The flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, the inlet and secondary pure water outlet of the pure water diversion solenoid valve are connected, and the primary pure water outlet of the pure water diversion solenoid valve is closed. The booster pump pumps pure water into the reverse osmosis membrane filter element for secondary purification. The resulting concentrate flows out from the concentrate port of the reverse osmosis membrane filter element and flows to the concentrate outlet. The produced secondary pure water flows to the secondary pure water storage port or to the secondary pure water outlet one. After the secondary pure water outlet one is closed, the produced secondary pure water is stored in the secondary pure water zone. When the secondary pure water zone is full, the pressure increases, triggering the secondary high-pressure switch to disconnect, and the purification mode of the reverse osmosis filtration system ends. Mode 5 (Membrane Washing Mode): Close the pure water inlet / outlet, connect the membrane washing valve to the primary filtrate outlet, switch the pure water outlet one or the pressure relief solenoid valve, low water pressure triggers the high-pressure switch to turn on, start the reverse osmosis filtration system to enter the membrane washing mode, the raw water inlet and outlet of the inlet solenoid valve are connected, the flushing inlet of the inlet solenoid valve is closed, the inlet and primary pure water outlet of the pure water diversion solenoid valve are connected, the secondary pure water outlet of the pure water diversion solenoid valve is closed, the pure water produced by the reverse osmosis membrane filter element flows to the raw water inlet through the membrane washing valve and the primary filtrate outlet, the booster pump pumps the produced pure water and raw water into the reverse osmosis membrane filter element for membrane washing, and the generated membrane washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element to the concentrate outlet; Mode Six (Acid Washing Mode): Close the pure water inlet / outlet. The membrane washing valve is connected to the acid washing chemical loading device and then to the post-ultrafiltration drain valve. Switch the pure water outlet one or the pressure relief solenoid valve. Low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into acid washing mode. The raw water inlet and outlet of the water inlet solenoid valve are connected. The flushing inlet of the water inlet solenoid valve is closed. The inlet and primary pure water outlet of the pure water diversion solenoid valve are connected. The secondary pure water outlet of the pure water diversion solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter element flows into the acid washing chemical loading device through the membrane washing valve to form acid washing solution. After acid washing the post-ultrafiltration module, it flows to the raw water inlet. The booster pump pumps the acid washing solution into the reverse osmosis membrane filter element for acid washing. The generated acid washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element and flows to the concentrate outlet.

4. In the water-saving secondary purification ultrapure water system according to claim 3, if the pure water TDS monitoring device detects that the TDS value of the produced pure water is abnormally high and reaches the standard of stagnant water, the flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, and the booster pump pumps the stagnant water into the reverse osmosis membrane filter element for further filtration. After the pure water TDS value returns to normal, the raw water inlet and outlet of the water inlet solenoid valve are connected, and the flushing inlet of the water inlet solenoid valve is closed. In the purification mode of the reverse osmosis filtration system, if the pure water TDS monitoring device detects that the TDS value of the produced secondary pure water is abnormally high and does not meet the secondary pure water standard, the inlet and the primary pure water outlet of the pure water diversion solenoid valve are connected, and the secondary pure water outlet of the pure water diversion solenoid valve is closed. The booster pump pumps the substandard secondary pure water into the reverse osmosis membrane filter element for further filtration. After the secondary pure water TDS value returns to normal, the inlet and the secondary pure water outlet of the pure water diversion solenoid valve are connected, and the primary pure water outlet of the pure water diversion solenoid valve is closed.

5. The water-saving secondary purification ultrapure water system according to claim 1, wherein the concentrate diversion and recovery system is characterized in that: The reverse osmosis membrane inlet pressure monitoring device can monitor the reverse osmosis membrane inlet pressure, and adjust the size of the adjustable concentrate ratio valve and the adjustable recovery ratio valve according to the TDS value monitored by the concentrate TDS monitoring device, thereby adjusting the concentrate flow rate and the recovery water flow rate and controlling the reverse osmosis membrane inlet pressure. When the TDS value detected by the concentrate TDS monitoring device reaches the set concentrate TDS value, the inlet and outlet of the concentrate diversion solenoid valve are connected, and the recovery outlet of the concentrate diversion solenoid valve is closed. The concentrate entering the concentrate diversion and recovery system from the recovery inlet flows to the concentrate storage port and the recovery outlet. When the TDS value detected by the concentrate TDS monitoring device is lower than the set concentrate TDS value, the inlet and the recovery outlet of the concentrate diversion solenoid valve are connected, the drain outlet of the concentrate diversion solenoid valve is closed, and all the water entering the concentrate diversion recovery system from the recovery inlet flows to the recovery outlet. When the reverse osmosis filtration system is in water production mode, the concentrated water flowing to the recovery outlet in the concentrated water diversion and recovery system flows into the reverse osmosis filtration system for secondary filtration. In the zero-stagnant-water flushing mode and purification mode of the reverse osmosis filtration system, the water flowing to the recovery outlet in the concentrate diversion and recovery system is reversed and passed through the primary filtration system to backwash the coarse filtration module, the pre-ultrafiltration module, and the post-ultrafiltration module in the primary filtration system before being recovered and stored in the tap water area. In the membrane washing mode, the inlet and the recovery outlet of the concentrate diversion solenoid valve are connected, the drain outlet of the concentrate diversion solenoid valve is closed, the membrane washing water outlet is opened, and all the membrane washing water is discharged. In the acid washing mode, the inlet and the recovery outlet of the concentrate flow solenoid valve are connected, the drain outlet of the concentrate flow solenoid valve is closed, and the recovery outlet is connected to the post-ultrafiltration drain valve. The recovered acid washing wastewater is used to circulate and acid wash the post-ultrafiltration module and the reverse osmosis membrane filter element. After the acid washing of the post-ultrafiltration module and the reverse osmosis membrane filter element is completed, the membrane washing water outlet is opened, all the acid washing wastewater is discharged, and the acid washing mode ends. When the wastewater reuse outlet is opened, the concentrated water in the concentrated water zone is driven by the water pressure supplied from the tap water zone. The concentrated water discharged from the concentrated water storage port flows through the normally open side of the concentrated water four-way valve and the concentrated water reuse one-way valve to the wastewater reuse outlet. After the concentrated water zone is drained, the water from the tap water replenishment port flows through the normally closed side of the concentrated water four-way valve to the wastewater reuse outlet.

6. The water-saving secondary purification ultrapure water system according to claim 1, wherein the multifunctional pressure vessel is characterized in that: The tap water zone, the pure water zone, the concentrated water zone, and the secondary pure water zone can drive each other. When the external tap water supply is stable, the air pressure zone can release the gas through the valve core to make more usable space for other functional areas. When needed, the air pressure zone can be refilled through the valve core. When the external tap water supply is interrupted, the air pressure zone can drive other functional zones by releasing the stored pressure or filling with air. When the reverse osmosis filtration system is in zero-staple water flushing mode, the pure water used for flushing in the pure water zone will eventually be recycled and stored in the tap water zone.

7. The water-saving secondary purification ultrapure water system according to claim 1, characterized in that, It also includes another structure of the reverse osmosis filtration system: The raw water inlet of the reverse osmosis filtration system is sequentially connected to the raw water check valve and the raw water inlet of the inlet solenoid valve. The outlet of the inlet solenoid valve is sequentially connected to the booster pump, reverse osmosis membrane filter element, pure water TDS monitoring device, reverse osmosis filter element water flow sensor, and pure water check valve. The outlet of the pure water check valve is divided into three branches: the first branch is sequentially connected to the low-pressure switch, zero-staple water flushing water flow sensor, zero-staple water flushing check valve, and the flushing inlet of the inlet solenoid valve; the second branch is connected to the pure water storage port; and the third branch is sequentially connected to the water intake flow sensor and the pressure holding check valve. The outlet of the pressure holding check valve is divided into three branches: the first branch is connected to pure water outlet one; the second branch is sequentially connected to the membrane washing check valve and the membrane washing valve; and the third branch is sequentially connected to the pressure relief proportional valve, the high-pressure switch, and the pressure relief solenoid valve. The primary pure water inlet of the secondary inlet solenoid valve is divided into two branches, one of which is connected to the outlet of the zero-staple water flushing check valve, and the other branch is connected to the secondary inlet solenoid valve through the water replenishment check valve. The reflux inlet is connected in sequence to the outlet of the secondary water inlet solenoid valve, which is connected to the secondary booster pump, the secondary reverse osmosis membrane filter element, and the secondary pure water TDS monitoring device. The outlet of the secondary pure water TDS monitoring device is divided into two branches. One branch is connected in sequence to the reflux check valve and the reflux inlet of the secondary water inlet solenoid valve. The other branch is connected in sequence to the secondary reverse osmosis filter element flow sensor and the secondary pure water check valve. The outlet of the secondary pure water check valve is divided into two branches. One branch is connected to the secondary pure water storage port. The other branch is connected in sequence to the secondary water intake flow sensor and the secondary pressure holding check valve. The outlet of the secondary pressure holding check valve is divided into two branches. One branch is connected to the secondary pure water outlet one. The other branch is connected in sequence to the secondary pressure relief proportional valve, the secondary high-pressure switch, and the secondary pressure relief solenoid valve. The concentrate port of the secondary reverse osmosis membrane filter element is connected in sequence to the inlet of the secondary concentrate check valve and the raw water check valve. The concentrate port of the reverse osmosis membrane filter element is connected in sequence to the concentrate check valve and the concentrate outlet.

8. The water-saving secondary purification ultrapure water system according to claim 7, characterized in that, Another structure of the reverse osmosis filtration system includes the following mode: Mode 1 (Water Intake Mode): Same as Mode 1 of the reverse osmosis filtration system of the water-saving secondary purification ultrapure water system described in claim 3; Mode 2 (Water Production Mode): When the pure water outlet is opened, or the pressure relief solenoid valve is switched on and off, low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into water production mode. The raw water inlet and outlet of the water inlet solenoid valve are connected, and the flushing inlet of the water inlet solenoid valve is closed. The booster pump pumps the raw water into the reverse osmosis membrane filter element for filtration. The produced pure water flows out from the pure water port of the reverse osmosis membrane filter element and flows to the pure water storage port or the pure water outlet. The generated concentrated water flows out from the concentrated water port of the reverse osmosis membrane filter element and flows to the concentrated water outlet. After the pure water outlet is closed, the produced pure water is stored in the pure water zone. When the pure water zone is full, the pressure increases, triggering the high-pressure switch to turn off, and the water production mode of the reverse osmosis filtration system ends. Mode 3 (Zero Backwater Flushing Mode): After the reverse osmosis filtration system finishes its water production mode, it enters the zero backwater flushing mode. The flushing inlet and outlet of the inlet solenoid valve are connected, while the raw water inlet of the inlet solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter and the pure water in the pure water zone flow to the inlet of the booster pump. The booster pump pumps the pure water into the reverse osmosis membrane filter for zero backwater flushing, discharging the concentrated water inside the reverse osmosis membrane filter to avoid the generation of backwater. When the TDS value monitored by the concentrated water TDS monitoring device reaches the zero backwater flushing set value, the zero backwater flushing mode of the reverse osmosis filtration system ends, or it can be ended at any time as needed through the external control system. Mode 4 (Purification Mode): When the secondary pure water outlet is opened, or the secondary pressure relief solenoid valve is switched on and off, low water pressure triggers the secondary high-pressure switch to turn on, and the reverse osmosis filtration system enters the purification mode. The primary pure water inlet and outlet of the secondary water inlet solenoid valve are connected, and the reflux inlet of the secondary water inlet solenoid valve is closed. The secondary booster pump pumps the primary pure water into the secondary reverse osmosis membrane filter element for secondary purification. The resulting concentrate flows out from the concentrate outlet of the secondary reverse osmosis membrane filter element and flows to the inlet of the raw water one-way valve. The obtained secondary pure water flows to the secondary pure water storage port or to the secondary pure water outlet. After the secondary pure water outlet is closed, the obtained secondary pure water is stored in the secondary pure water zone. When the secondary pure water zone is full, the pressure increases, triggering the secondary high-pressure switch to turn off, and the purification mode of the reverse osmosis filtration system ends. Mode 5 (Membrane Washing Mode): Close the pure water inlet / outlet, connect the membrane washing valve to the primary filtrate outlet, switch the pure water outlet or the pressure relief solenoid valve, low water pressure triggers the high-pressure switch to turn on, start the reverse osmosis filtration system to enter the membrane washing mode, connect the raw water inlet and outlet of the inlet solenoid valve, close the flushing inlet of the inlet solenoid valve, the pure water produced by the reverse osmosis membrane filter element flows to the raw water inlet through the membrane washing valve and the primary filtrate outlet, the booster pump pumps the produced pure water and raw water into the reverse osmosis membrane filter element for membrane washing, and the generated membrane washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element to the concentrate outlet; Mode Six (Acid Washing Mode): The pure water inlet / outlet is closed. The membrane washing valve is connected to the acid washing chemical loading device and then to the post-ultrafiltration drain valve. The pure water outlet is switched on or off, or the pressure relief solenoid valve is switched on. Low water pressure triggers the high-pressure switch to turn on, starting the reverse osmosis filtration system into acid washing mode. The raw water inlet and outlet of the water inlet solenoid valve are connected. The flushing inlet of the water inlet solenoid valve is closed. The pure water produced by the reverse osmosis membrane filter element flows into the acid washing chemical loading device through the membrane washing valve to form acid washing solution. After acid washing the post-ultrafiltration module, it flows to the raw water inlet. The booster pump pumps the acid washing solution into the reverse osmosis membrane filter element for acid washing. The generated acid washing wastewater is discharged from the concentrate outlet of the reverse osmosis membrane filter element and flows to the concentrate outlet.

9. A water-saving secondary purification ultrapure water system according to claim 7, characterized in that, In another configuration of the reverse osmosis filtration system, under water production mode, if the pure water TDS monitoring device detects that the TDS value of the produced pure water is abnormally high and reaches the standard for aged water, the flushing inlet and outlet of the water inlet solenoid valve are connected, the raw water inlet of the water inlet solenoid valve is closed, and the booster pump pumps the aged water into the reverse osmosis membrane filter element for further filtration. After the pure water TDS value returns to normal, the raw water inlet and outlet of the water inlet solenoid valve are connected, and the flushing inlet of the water inlet solenoid valve is closed. In the purification mode of the reverse osmosis filtration system, if the secondary pure water TDS monitoring device detects that the TDS value of the produced secondary pure water is abnormally high and does not meet the secondary pure water standard, the reflux inlet and outlet of the secondary water inlet solenoid valve are connected, and the primary pure water inlet of the secondary water inlet solenoid valve is closed. The substandard secondary pure water flows to the reflux inlet of the secondary water inlet solenoid valve through the reflux check valve, and the primary pure water flows to the reflux inlet of the secondary water inlet solenoid valve through the makeup water check valve. The secondary booster pump pumps the substandard secondary pure water into the secondary reverse osmosis membrane filter element for further filtration. After the secondary pure water TDS value returns to normal, the primary pure water inlet and outlet of the secondary water inlet solenoid valve are connected, and the reflux inlet of the secondary water inlet solenoid valve is closed.

10. A water-saving secondary purification ultrapure water system according to claim 7, characterized in that, The inlet solenoid valve and the secondary inlet solenoid valve are two-position three-way solenoid valves with two inlets and one outlet. Their functions can be replaced by a two-position normally closed solenoid valve and a two-position normally open solenoid valve connected in parallel at the outlet, or by a two-position four-way solenoid valve connected in parallel at the outlet. The concentrate flow solenoid valve and the pure water flow solenoid valve are two-position three-way solenoid valves with one inlet and two outlets. Their functions can be replaced by a two-position normally closed solenoid valve and a two-position normally open solenoid valve connected in parallel at the inlet, or by a two-position four-way solenoid valve connected in parallel at the inlet.

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