Water quality purification system based on two-stage membrane treatment and control method thereof

Abstract

The invention discloses a water quality purification system based on two-stage membrane treatment and a control method thereof, and belongs to the technical field of water quality purification. The water quality purification system comprises a filtering tank, the right side of the filtering tank is connected with a reclaimed water tank, the lower end of the reclaimed water tank is connected with a security filter, and the left end of the security filter is connected with a high-pressure pump; the water pipe between the security filter and the high-pressure pump is connected with a second electric valve, the left end of the high-pressure pump is connected with a third electric valve, the left end of the third electric valve is connected with two groups of membrane shells, the upper ends of the membrane shells are connected with a fifth electric valve and a fourth electric valve, and the left end of the fifth electric valve is connected with two groups of pure water tanks; the lower end of the pure water tank is connected with the second electric valve, the upper end of the fourth electric valve is connected with the first electric valve, and automatic switching of single-stage and double-stage water purification is achieved through automatic switching of the second electric valve, the third electric valve, the fourth electric valve and the fifth electric valve, and timing flushing circulation of a membrane shell is achieved.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, specifically to a water purification system based on two-stage membrane treatment and its control method. Background Technology

[0002] Reverse osmosis concentrate recirculation is a water-saving treatment technology that uses reverse osmosis membranes to filter and re-concentrate concentrate, thereby achieving water resource recycling and reducing concentrate discharge, which is beneficial to water conservation.

[0003] However, existing water purification systems use a single membrane for recirculation and filtration. Although they have a membrane flushing function, their structure and flushing methods are limited, which can lead to membrane fouling, frequent replacement, deterioration of water quality, and increased maintenance costs.

[0004] Based on this, the present invention designs a water purification system and its control method based on dual-membrane treatment to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a water purification system based on two-stage membrane treatment and its control method.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A water purification system based on two-stage membrane treatment includes a filter tank and a PLC controller; A medium-water tank is fixedly connected to the right side of the filter tank. A security filter is fixedly connected to the lower end of the medium-water tank. A high-pressure pump is fixedly connected to the left end of the security filter. A second electric valve is fixedly connected to the water pipe between the security filter and the high-pressure pump. A third electric valve is fixedly connected to the left end of the high-pressure pump. Two sets of membrane housings are fixedly connected to the left end of the third electric valve. A fifth electric valve and a fourth electric valve are fixedly connected to the upper end of each membrane housing. Two sets of pure water tanks are fixedly connected to the left end of the fifth electric valve. The lower end of the pure water tank is fixedly connected to the second electric valve. A first electric valve is fixedly connected to the upper end of the fourth electric valve. A concentrated water drain pipe is fixedly connected to the left end of the first electric valve. A tap water pipe is fixedly connected to the upper end of the first electric valve. An ultraviolet sterilizer is fixedly connected to the right end of the tap water pipe. The right end of the ultraviolet sterilizer is fixedly connected to the filter tank. Circulation flushing valves are fixedly connected to both sides of the filter tank. The left and right ends of the circulation flushing valves are fixedly connected to and communicate with the water pipes on the left and right sides of the filter tank, respectively.

[0007] Furthermore, a conductivity sensor is fixedly connected inside the water tank.

[0008] Further, the first electric valve, the high-pressure pump, the second electric valve, the electric conductivity sensor, the third electric valve, the fourth electric valve and the fifth electric valve are electrically connected with the PLC controller through lines.

[0009] Further, the membrane shell comprises a vortex reverse osmosis assembly and a quick dismounting joint, the upper end of the vortex reverse osmosis assembly is fixedly connected with the fifth electric valve and the fourth electric valve, the lower end of the vortex reverse osmosis assembly is connected with the quick dismounting joint, and the lower end of the quick dismounting joint is connected with the third electric valve.

[0010] Further, the vortex reverse osmosis assembly comprises a shell, a vortex reverse osmosis membrane, a pure water pipe and a concentrated water outlet pipe, the concentrated water outlet pipe is fixedly connected with the opening in the middle of the top plate of the shell, the shell is without a bottom plate, the middle of the concentrated water outlet pipe is connected with the pure water outlet pipe, the lower end of the pure water outlet pipe penetrates through the top plate of the shell and the height of the bottom of the pure water outlet pipe is the same as the height of the inner top of the shell, the lower end of the pure water outlet pipe is clamped with the pure water pipe through a clamping block and a clamping groove, the pure water pipe is connected with the pure water outlet pipe, the outer end of the pure water pipe is fixedly connected with the vortex reverse osmosis membrane, the outer end of the vortex reverse osmosis membrane is in contact with the inner wall of the shell, the top of the vortex reverse osmosis membrane is in contact with the inner top of the shell, the vortex reverse osmosis membrane is of a hollow structure and the inner end of the vortex reverse osmosis membrane is connected with the pure water pipe, and the lower end of the vortex reverse osmosis membrane and the pure water pipe is connected with the quick dismounting joint.

[0011] Further, the quick dismounting joint comprises a clamping ring, a fixing ring, a bottom cover, a top plate, a connecting slide rod, an inlet pipe and a threaded extrusion block, the lower end of the shell is clamped with the clamping ring through an annular clamping groove and an annular clamping block, the outer wall upper end of the clamping ring and the outer wall lower end of the shell are fixedly connected with the fixing ring, the two groups of fixing rings are fixedly connected through bolts, the inner end of the clamping ring is clamped with the bottom cover, the middle of the bottom cover is fixedly connected with the inlet pipe, the upper end of the inlet pipe is threadedly connected with the threaded extrusion block on the outer side, the upper end of the threaded extrusion block is in contact with the top ring, the upper end of the inlet pipe penetrates through the top ring, the top of the top ring is fixedly connected with a plurality of groups of connecting slide rods, the connecting slide rods penetrate through the bottom cover and are in sliding connection with the bottom cover, the top of the connecting slide rods is fixedly connected with the top plate, and the top of the top plate is in contact with the vortex reverse osmosis membrane and the pure water pipe.

[0012] Further, the diameter of the top plate is smaller than the cross-sectional diameter of the shell, and the diameter of the top plate is larger than the diameter of the opening in the middle of the top plate of the shell.

[0013] In order to better achieve the purpose of the present application, the present application further provides a control method of a water quality purification system based on a double-stage membrane treatment, comprising the following steps: Step one: the tap water from the tap into the filter tank, while through the ultraviolet sterilizer disinfection of tap water, tap water through the filter tank and into the water tank, through the water tank for temporary storage and at the same time through the conductivity sensor for water in the water tank detection, then the water through the security filter again and through the high pressure pump and water pipe to the shell of the lower end, at this time the water through the top plate of the outside into the vortex reverse osmosis membrane interval, due to the vortex reverse osmosis membrane upper end outside is covered by the top plate of the shell, so that the water along the vortex reverse osmosis membrane vortex direction to the inner end of the vortex reverse osmosis membrane movement, in the process of vortex reverse osmosis membrane on the water continuously reverse osmosis filtration, so that the pure water continuously into the vortex reverse osmosis membrane inside and into the pure water pipe, when the water movement to the concentrated water outlet pipe below through the concentrated water outlet pipe is allocated, pure water into the pure water outlet pipe and is discharged, concentrated water through the concentrated water outlet pipe and water pipe into the first electric valve and through the ultraviolet sterilizer in the next cycle, pure water through the fifth electric valve is sent into the pure water tank for storage; Step two: when the need to replace the vortex reverse osmosis membrane loose bolt so that the snap ring and the shell is separated, at this time remove the vortex reverse osmosis membrane and pure water pipe for replacement can be, after the replacement of the vortex reverse osmosis membrane and the shell through the fixed ring and bolted together, at this time rotate the threaded block, threaded block drive top ring up movement, top ring drive connection slide bar and top plate up movement, so that the top plate extrusion pure water pipe and vortex reverse osmosis membrane up movement, so that the pure water pipe and pure water outlet pipe card joint, when the vortex reverse osmosis membrane top fit inside the top of the shell, complete the fixation of the vortex reverse osmosis membrane; Step three: when the need to clean the membrane shell through the PLC controller control the first electric valve to the concentrated water drain pipe and tap pipe closed, PLC controller controls the cycle flush valve open and control the fifth electric valve is disconnected with the pure water tank, at this time increase the high pressure pump power, high pressure pump using the water tank in the water continuously circulation to the membrane shell flushing, during which do not stop using the conductivity sensor detection conductivity, when the conductivity sensor detects the conductivity of the water tank reaches the set value, stop flushing, at this time the impurities in the membrane shell are mostly washed out, at this time close the cycle flush valve and through the water tank in the water to the filter tank and flush the flushing water through the concentrated water drain pipe, in the process of instrument operation through the PLC controller control the second electric valve switch to high pressure pump and pure water tank connected and disconnect the high pressure pump and security filter communication, so that the pure water tank in the pure water through the high pressure pump is sent to the membrane shell inside the membrane shell flushing, flushing after the impurities from the fourth electric valve is discharged, flushing after the pure water into the water tank again, so as to realize the cycle flushing of the membrane shell, after flushing control the second electric valve switch to high pressure pump and security filter communication; Step four: when the quality of tap water is poor, the third electric valve is switched to the high pressure pump by the PLC controller to be connected to one set of membrane shells and the fifth electric valve is switched to the working membrane shell to be connected to the lower set of pure water tanks. When the water level in the set of pure water tanks reaches the high level, the second electric valve is switched to the lower set of pure water tanks to be connected to the high pressure pump by the PLC controller and the third electric valve is switched to the high pressure pump to be connected to the other set of membrane shells. At this time, the once purified pure water in the lower set of pure water tanks is filtered again by the other set of membrane shells and is sent to the upper set of pure water tanks by the high pressure pump. Step five: when purifying tap water, the third electric valve is switched to connect the high pressure pump to two sets of membrane shells at the same time by the PLC controller when a higher purification speed is needed. At this time, the tap water is purified by two sets of membrane shells at the same time. When a too high water purification speed is not needed, the third electric valve is switched to connect the high pressure pump to only one set of membrane shells. At this time, only one set of membrane shells purifies the water. When one set of membrane shells is damaged, the third electric valve is switched to connect the high pressure pump to the other set of membrane shells. At this time, the damaged membrane shells can be repaired. Beneficial effects

[0014] 1、When the water needs to be purified, the tap water is sent into the filter tank from the tap water pipeline, and the tap water is disinfected by the ultraviolet sterilizer at the same time. The tap water is filtered by the filter tank and enters the reclaimed water tank. The reclaimed water is temporarily stored in the reclaimed water tank, and the conductivity sensor detects the reclaimed water in the reclaimed water tank at the same time. Then the reclaimed water is filtered again by the security filter and is sent to the lower end of the shell by the high-pressure pump and the water inlet pipe. At this time, the reclaimed water enters the interval of the vortex reverse osmosis membrane through the outside of the top plate. Since the upper end of the vortex reverse osmosis membrane is blocked by the top plate of the shell, the reclaimed water moves along the vortex direction of the vortex reverse osmosis membrane to the inner end of the vortex reverse osmosis membrane. In this process, the vortex reverse osmosis membrane continuously performs reverse osmosis filtration on the reclaimed water, so that pure water continuously enters the inside of the vortex reverse osmosis membrane and enters the pure water pipe. When the reclaimed water moves to the lower end of the concentrated water outlet pipe, it is discharged through the concentrated water outlet pipe. The pure water enters the pure water outlet pipe and is discharged. The vortex flow of the reclaimed water is realized by the vortex reverse osmosis membrane, and the water flows out from the middle part to realize the extension of the reverse osmosis time of the reclaimed water, and greatly increase the contact area of the vortex reverse osmosis membrane and the reclaimed water, so that the reverse osmosis of the reclaimed water is more perfect. The concentrated water enters the first electric valve through the concentrated water outlet pipe and the water pipe and is subjected to the next cycle in the ultraviolet sterilizer. The pure water is sent into the pure water tank by the fifth electric valve for storage, so as to complete the purification of the water quality. When the vortex reverse osmosis membrane needs to be replaced, the bolt is loosened to separate the snap ring from the shell. At this time, the vortex reverse osmosis membrane and the pure water pipe are removed for replacement. After replacement, the vortex reverse osmosis membrane and the shell are fixed together by the fixing ring and the bolt. At this time, the threaded extrusion block is rotated, the threaded extrusion block drives the top ring to move upward, the top ring drives the connecting slide rod and the top plate to move upward, so that the top plate extrudes the pure water pipe and the vortex reverse osmosis membrane to move upward, so that the pure water pipe is clamped with the pure water outlet pipe. When the top of the vortex reverse osmosis membrane is attached to the inner top of the shell, the fixation of the vortex reverse osmosis membrane is completed. At this time, the fixation of the vortex reverse osmosis membrane is completed, and the bottom inner end of the vortex reverse osmosis membrane is sealed. Since the height of the adjustable top plate can be adjusted, various lengths of vortex reverse osmosis membranes can be used, and the replacement of the vortex reverse osmosis membrane is simple. When the membrane shell needs to be cleaned, the PLC controller controls the first electric valve to close the concentrated water drain pipe and the tap water pipeline. The PLC controller controls the circulating flushing valve to open and controls the fifth electric valve to disconnect the connection with the pure water tank at the same time. At this time, the power of the high-pressure pump is increased. The high-pressure pump uses the reclaimed water in the reclaimed water tank to continuously circulate to flush the membrane shell. During this period, the conductivity sensor detects the conductivity. When the conductivity sensor detects that the conductivity in the reclaimed water tank reaches the set value, the flushing is stopped. At this time, most of the impurities in the membrane shell are flushed out. At this time, the circulating flushing valve is closed, and the filter tank is flushed by the reclaimed water in the reclaimed water tank and the flushing water is discharged through the concentrated water drain pipe, so as to realize the automatic flushing of the membrane shell and the filter tank. Moreover, the reclaimed water in the reclaimed water tank is used for flushing, which reduces the waste of pure water.And the second electric valve is switched to connect the high-pressure pump with the pure water tank and disconnect the high-pressure pump from the safety filter by the PLC controller during the operation of the instrument, so that the pure water in the pure water tank is sent to the membrane shell by the high-pressure pump to flush the membrane shell, and the impurities after flushing are discharged from the fourth electric valve, and the pure water after flushing enters the middle water tank again, so that the circulation flushing of the membrane shell is realized, and when the flushing is completed, the second electric valve is switched to connect the high-pressure pump with the safety filter, so that the timing flushing of the membrane shell is realized, the stable work of the membrane shell is ensured, the quality of the pure water is improved, and the waste of the pure water is avoided because the flushing cycle is in the whole water purification cycle.

[0015] 2. When the quality of tap water is poor, the third electric valve is switched to connect the high-pressure pump with one group of membrane shells and the fifth electric valve is switched to connect the working membrane shell with the next group of pure water tanks by the PLC controller, when the water level in the group of pure water tanks reaches the high position, the second electric valve is switched to connect the next group of pure water tanks with the high-pressure pump and the third electric valve is switched to connect the high-pressure pump with the other group of membrane shells by the PLC controller, at this time, the pure water in the next group of pure water tanks is filtered again by the other group of membrane shells and is sent to the upper group of pure water tanks by the high-pressure pump, so that the double-stage water production is realized, and then the automatic single-stage and double-stage free switching is realized, so that the purification of different water quality can be realized.

[0016] 3. When purifying tap water, if higher purification speed is needed, the third electric valve is switched to connect the high-pressure pump with two groups of membrane shells by the PLC controller, at this time, the tap water is purified by the two groups of membrane shells at the same time, so that the water purification efficiency is greatly improved, when the water purification speed is not too high, the third electric valve is switched to connect the high-pressure pump with one group of membrane shells, at this time, the water is purified by only one group of membrane shells, so that the free switching of different water purification efficiency is realized, and when one group of membrane shells is damaged, the third electric valve is switched to connect the high-pressure pump with the other group of membrane shells, at this time, the damaged membrane shell can be repaired without affecting the work of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0018] Figure 1 It is a structure schematic diagram of a water quality purification system based on double-stage membrane treatment. Figure 2A membrane shell structure diagram of a water purification system based on two-stage membrane treatment according to the present application; Figure 3 A pure water pipe structure diagram of a water purification system based on two-stage membrane treatment according to the present application; Figure 4 A Figure 3 An enlarged view of A in FIG. 1; Figure 5 A Figure 3 An enlarged view of B in FIG. 1; Figure 6 A vortex reverse osmosis membrane structure diagram of a water purification system based on two-stage membrane treatment according to the present application.

[0019] The reference numbers in the figures represent: 1, a first electric valve; 2, an ultraviolet sterilizer; 3, a filter tank; 4, a reclaimed water tank; 5, a security filter; 6, a high-pressure pump; 7, a membrane shell; 71, a vortex reverse osmosis assembly; 711, an outer shell; 712, a vortex reverse osmosis membrane; 713, a pure water pipe; 714, a concentrated water outlet pipe; 715, a pure water outlet pipe; 72, a quick disassembly joint; 721, a snap ring; 722, a fixing ring; 723, a bottom cover; 724, a top plate; 725, a connecting slide rod; 726, a top ring; 727, a water inlet pipe; 728, a threaded extrusion block; 8, a pure water tank; 9, a second electric valve; 10, a tap water pipeline; 11, a concentrated water drainage pipeline; 12, an electric conductivity sensor; 13, a PLC controller; 14, a circulating flushing valve; 15, a third electric valve; 16, a fourth electric valve; 17, a fifth electric valve. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0021] The present application will be further described below in combination with the embodiments.

[0022] Embodiment One Please refer to the accompanying drawings in the description Figures 1-6 A water purification system based on two-stage membrane treatment, comprising a filter tank 3 and a PLC controller 13; The right side of the filter tank 3 is fixedly connected with a middle water tank 4, the lower end of the middle water tank 4 is fixedly connected with a security filter 5, the left end of the security filter 5 is fixedly connected with a high-pressure pump 6, the water pipe between the security filter 5 and the high-pressure pump 6 is fixedly connected with a second electric valve 9, the left end of the high-pressure pump 6 is fixedly connected with a third electric valve 15, the left end of the third electric valve 15 is fixedly connected with two groups of membrane shells 7, the upper end of the membrane shell 7 is fixedly connected with a fifth electric valve 17 and a fourth electric valve 16, the left end of the fifth electric valve 17 is fixedly connected with two groups of pure water tanks 8, the lower end of the pure water tank 8 is fixedly connected with the second electric valve 9, the upper end of the fourth electric valve 16 is fixedly connected with a first electric valve 1, the left end of the first electric valve 1 is fixedly connected with a concentrated water drainage pipeline 11, the upper end of the first electric valve 1 is fixedly connected with a tap water pipeline 10, the right end of the tap water pipeline 10 is fixedly connected with an ultraviolet sterilizer 2, the right end of the ultraviolet sterilizer 2 is fixedly connected with the filter tank 3, the left and right sides of the filter tank 3 are fixedly connected with a circulating flushing valve 14, the left and right ends of the circulating flushing valve 14 are respectively fixedly connected with the water pipes on the left and right sides of the filter tank 3 and are in communication; The inside of the middle water tank 4 is fixedly connected with an electric conductivity sensor 12; The first electric valve 1, the high-pressure pump 6, the second electric valve 9, the electric conductivity sensor 12, the third electric valve 15, the fourth electric valve 16 and the fifth electric valve 17 are electrically connected with a PLC controller 13 through lines; The membrane shell 7 comprises a vortex reverse osmosis assembly 71 and a quick dismounting joint 72, the upper end of the vortex reverse osmosis assembly 71 is fixedly connected with the fifth electric valve 17 and the fourth electric valve 16, the lower end of the vortex reverse osmosis assembly 71 is connected with the quick dismounting joint 72, and the lower end of the quick dismounting joint 72 is connected with the third electric valve 15; The vortex reverse osmosis assembly 71 comprises a shell 711, a vortex reverse osmosis membrane 712, a pure water pipe 713 and a concentrated water outlet pipe 714, the concentrated water outlet pipe 714 is fixedly connected at the middle opening of the top plate of the shell 711, the shell 711 has no bottom plate, the middle part of the concentrated water outlet pipe 714 is connected with the pure water outlet pipe 715, the lower end of the pure water outlet pipe 715 penetrates through the top plate of the shell 711 and the height of the bottom of the pure water outlet pipe 715 is the same as the height of the inner top of the shell 711, the lower end of the pure water outlet pipe 715 is clamped with the pure water pipe 713 through the clamping block and the clamping groove, the pure water pipe 713 is in communication with the pure water outlet pipe 715, the outer end of the pure water pipe 713 is fixedly connected with the vortex reverse osmosis membrane 712, the outer end of the vortex reverse osmosis membrane 712 is in contact with the inner wall of the shell 711, the top of the vortex reverse osmosis membrane 712 is in contact with the inner top of the shell 711, the vortex reverse osmosis membrane 712 is a hollow structure and the inner end of the vortex reverse osmosis membrane 712 is in communication with the pure water pipe 713, the lower end of the vortex reverse osmosis membrane 712 and the pure water pipe 713 is connected with the quick disassembly joint 72; The quick disassembly joint 72 comprises a clamping ring 721, a fixed ring 722, a bottom cover 723, a top plate 724, a connecting slide rod 725, a top ring 726, an inlet pipe 727 and a threaded extrusion block 728, the lower end of the shell 711 is clamped with the clamping ring 721 through the annular clamping groove and the annular clamping block, the outer wall upper end of the clamping ring 721 and the outer wall lower end of the shell 711 are both fixedly connected with the fixed ring 722, the two groups of fixed rings 722 are fixedly connected through bolts, the inner end of the clamping ring 721 is clamped with the bottom cover 723, the middle part of the bottom cover 723 is fixedly connected with the inlet pipe 727, the upper end of the inlet pipe 727 is threadedly connected with the threaded extrusion block 728 on the outside, the upper end of the threaded extrusion block 728 is in contact with the top ring 726, the upper end of the inlet pipe 727 penetrates through the top ring 726, the top of the top ring 726 is fixedly connected with a plurality of groups of connecting slide rods 725, the connecting slide rods 725 penetrate through the bottom cover 723 and are in sliding connection with the bottom cover 723, the top of the connecting slide rods 725 is fixedly connected with the top plate 724, the top of the top plate 724 is in contact with the vortex reverse osmosis membrane 712 and the pure water pipe 713; The diameter of the top plate 724 is smaller than the cross-sectional diameter of the shell 711, and the diameter of the top plate 724 is larger than the diameter of the middle opening of the top plate of the shell 711; When the water needs to be purified, the tap water is sent into the filter tank 3 from the tap water pipeline 10, and the tap water is disinfected by the ultraviolet sterilizer 2, the tap water is filtered by the filter tank 3 and enters the reclaimed water tank 4, the reclaimed water is temporarily stored by the reclaimed water tank 4 and detected by the conductivity sensor 12 at the same time, then the reclaimed water is filtered again by the security filter 5 and sent to the lower end of the shell 711 by the high-pressure pump 6 and the water inlet pipe 727, at this time the reclaimed water enters the interval of the vortex reverse osmosis membrane 712 through the outside of the top plate 724, because the upper end of the vortex reverse osmosis membrane 712 is blocked by the top plate of the shell 711, so that the reclaimed water moves along the vortex direction of the vortex reverse osmosis membrane 712 to the inner end of the vortex reverse osmosis membrane 712, in this process the vortex reverse osmosis membrane 712 continuously performs reverse osmosis filtration on the reclaimed water, so that pure water continuously enters the inside of the vortex reverse osmosis membrane 712 and enters the pure water pipe 713, when the reclaimed water moves to the lower side of the concentrated water outlet pipe 714, it is discharged through the concentrated water outlet pipe 714, the pure water enters the pure water outlet pipe 715 and is discharged, the vortex reverse osmosis membrane 712 makes the reclaimed water flow in a vortex shape and flow out from the middle to the outside, which prolongs the reverse osmosis time of the reclaimed water and greatly increases the contact area between the vortex reverse osmosis membrane 712 and the reclaimed water, so that the reverse osmosis of the reclaimed water is more perfect, the concentrated water enters the first electric valve 1 through the concentrated water outlet pipe 714 and the water pipe and is subjected to the next cycle in the ultraviolet sterilizer 2, the pure water is sent into the pure water tank 8 by the fifth electric valve 17 for storage, so the purification of the water quality is completed, when the vortex reverse osmosis membrane 712 needs to be replaced, the bolt is loosened to separate the snap ring 721 from the shell 711, at this time the vortex reverse osmosis membrane 712 and the pure water pipe 713 are removed for replacement, after the replacement is completed, the vortex reverse osmosis membrane 712 and the shell 711 are fixed together by the fixing ring 722 and the bolt, at this time the threaded extrusion block 728 is rotated, the threaded extrusion block 728 drives the top ring 726 to move upward, the top ring 726 drives the connecting slide rod 725 and the top plate 724 to move upward, so that the top plate 724 extrudes the pure water pipe 713 and the vortex reverse osmosis membrane 712 to move upward, so that the pure water pipe 713 is clamped with the pure water outlet pipe 715, when the vortex reverse osmosis membrane 712 is attached to the inner top of the shell 711, the fixing of the vortex reverse osmosis membrane 712 is completed, at this time the fixing of the vortex reverse osmosis membrane 712 is completed and the blocking of the bottom inner end of the vortex reverse osmosis membrane 712 is completed, because the height of the adjustable top plate 724 can be adjusted, so that vortex reverse osmosis membranes 712 of various lengths can be used, and the simple replacement of the vortex reverse osmosis membrane 712 is realized, when the membrane shell 7 needs to be cleaned, the first electric valve 1 is controlled by the PLC controller 13 to close the concentrated water drain pipeline 11 and the tap water pipeline 10, the PLC controller 13 controls the circulating flushing valve 14 to be opened and controls the fifth electric valve 17 to be disconnected from the pure water tank 8 at the same time, at this time the power of the high-pressure pump 6 is increased, the high-pressure pump 6 uses the reclaimed water in the reclaimed water tank 4 to continuously circulate and flush the membrane shell 7,During this period, the conductivity sensor 12 detects the conductivity, and when the conductivity sensor 12 detects that the conductivity in the reclaimed water tank 4 reaches the set value, the flushing is stopped, at this time, the impurities in the membrane shell 7 are mostly flushed out, at this time, the circulating flushing valve 14 is closed and the filter tank 3 is flushed by the reclaimed water in the reclaimed water tank 4 and the flushing water is discharged through the concentrated water drain pipe 11, thereby realizing automatic flushing of the membrane shell 7 and the filter tank 3, and the flushing is carried out by using the reclaimed water in the reclaimed water tank 4, reducing the waste of pure water, and during the operation of the instrument, the PLC controller 13 controls the second electric valve 9 to switch to connect the high-pressure pump 6 with the pure water tank 8 and disconnect the high-pressure pump 6 from the security filter 5, so that the pure water in the pure water tank 8 is sent to the inside of the membrane shell 7 through the high-pressure pump 6 to flush the membrane shell 7, and the impurities after flushing are discharged from the fourth electric valve 16, and the pure water after flushing enters the reclaimed water tank 4 again, thereby realizing the circulating flushing of the membrane shell 7, and when the flushing is completed, the second electric valve 9 is controlled to switch to connect the high-pressure pump 6 with the security filter 5, thereby realizing the timing flushing of the membrane shell 7, ensuring the stable work of the membrane shell 7, improving the quality of the pure water, and since the flushing cycle is in the whole water purification cycle, the waste of pure water is avoided. When the quality of tap water is poor, the PLC controller 13 controls the third electric valve 15 to switch to connect the high-pressure pump 6 with one group of membrane shells 7 and controls the fifth electric valve 17 to switch to connect the working membrane shell 7 with the pure water tank 8 below, when the water level in the pure water tank 8 reaches the high position, the PLC controller 13 controls the second electric valve 9 to switch to connect the pure water tank 8 below with the high-pressure pump 6 and controls the third electric valve 15 to switch to connect the high-pressure pump 6 with another group of membrane shells 7, at this time, the pure water in the pure water tank 8 below which has been purified once is filtered by another group of membrane shells 7 and is sent to the pure water tank 8 above, thereby realizing the double-stage water production from tap water, and further realizing the automatic free switching between single-stage and double-stage, so that the purification of different water quality can be realized. When purifying tap water, when a higher purification speed is needed, the PLC controller 13 controls the third electric valve 15 to switch to connect the high-pressure pump 6 with two groups of membrane shells 7 at the same time, at this time, the tap water is purified by two groups of membrane shells 7 at the same time, greatly improving the efficiency of water purification, when the water purification speed is not too high, the third electric valve 15 is switched to connect the high-pressure pump 6 with one group of membrane shells 7, at this time, only one group of membrane shells 7 is used for water purification, thereby realizing the free switching of different water purification efficiency, and when one group of membrane shells 7 is damaged, the third electric valve 15 is switched to connect the high-pressure pump 6 with another group of membrane shells 7, at this time, the damaged membrane shell 7 can be repaired without affecting the operation of the equipment.

[0023] Example two Please refer to the drawings in the specification Figures 1-6A control method of a water purification system based on a two-stage membrane treatment, comprising the following steps: Step one: tap water is sent into the filter tank 3 from the tap water pipeline 10, and the tap water is disinfected by the ultraviolet sterilizer 2, the tap water is filtered by the filter tank 3 and enters the reclaimed water tank 4, the reclaimed water is temporarily stored by the reclaimed water tank 4 and detected by the conductivity sensor 12 at the same time, then the reclaimed water is filtered again by the security filter 5 and sent to the lower end of the shell 711 by the high-pressure pump 6 and the water inlet pipe 727, at this time the reclaimed water enters the interval of the vortex reverse osmosis membrane 712 outside the top plate 724, since the upper end outside of the vortex reverse osmosis membrane 712 is blocked by the top plate of the shell 711, the reclaimed water moves along the vortex direction of the vortex reverse osmosis membrane 712 to the inner end of the vortex reverse osmosis membrane 712, in this process the vortex reverse osmosis membrane 712 continuously performs reverse osmosis filtration on the reclaimed water, so that pure water continuously enters the inside of the vortex reverse osmosis membrane 712 and enters the pure water pipe 713, when the reclaimed water moves below the concentrated water outlet pipe 714, it is discharged through the concentrated water outlet pipe 714, the pure water enters the pure water outlet pipe 715 and is discharged, the concentrated water enters the first electric valve 1 through the concentrated water outlet pipe 714 and the water pipe and is subjected to the next cycle in the ultraviolet sterilizer 2, the pure water is sent into the pure water tank 8 by the fifth electric valve 17 for storage; Step two: when the vortex reverse osmosis membrane 712 needs to be replaced, loosen the bolt to separate the snap ring 721 from the shell 711, at this time remove the vortex reverse osmosis membrane 712 and the pure water pipe 713 for replacement, after replacement, fix the vortex reverse osmosis membrane 712 and the shell 711 together through the fixing ring 722 and the bolt, at this time rotate the threaded extrusion block 728, the threaded extrusion block 728 drives the top ring 726 to move upward, the top ring 726 drives the connecting slide rod 725 and the top plate 724 to move upward, so that the top plate 724 extrudes the pure water pipe 713 and the vortex reverse osmosis membrane 712 to move upward, so that the pure water pipe 713 is clamped with the pure water outlet pipe 715, when the top of the vortex reverse osmosis membrane 712 is attached to the top of the shell 711, the fixation of the vortex reverse osmosis membrane 712 is completed; Step three: when the membrane shell 7 needs to be cleaned, the first electric valve 1 is controlled by the PLC controller 13 to close the concentrated water drainage pipe 11 and the tap water pipe 10, the PLC controller 13 controls the circulating flushing valve 14 to open and controls the fifth electric valve 17 to disconnect with the pure water tank 8, at this time, the power of the high-pressure pump 6 is increased, the high-pressure pump 6 uses the middle water in the middle water tank 4 to continuously circulate to flush the membrane shell 7, during which the electric conductivity sensor 12 detects the electric conductivity, when the electric conductivity sensor 12 detects that the electric conductivity in the middle water tank 4 reaches the set value, the flushing is stopped, at this time, the impurities in the membrane shell 7 are mostly flushed out, at this time, the circulating flushing valve 14 is closed and the filter tank 3 is flushed by the middle water in the middle water tank 4 and the flushing water is discharged through the concentrated water drainage pipe 11, during the operation of the instrument, the second electric valve 9 is controlled by the PLC controller 13 to switch to the high-pressure pump 6 connected with the pure water tank 8 and disconnect the high-pressure pump 6 from the security filter 5, so that the pure water in the pure water tank 8 is sent to the inside of the membrane shell 7 by the high-pressure pump 6 to flush the membrane shell 7, the impurities after flushing are discharged from the fourth electric valve 16, and the pure water after flushing enters the middle water tank 4 again, so that the circulating flushing of the membrane shell 7 is realized, and when the flushing is completed, the second electric valve 9 is controlled to switch to the high-pressure pump 6 connected with the security filter 5; Step four: when the tap water quality is poor, the third electric valve 15 is controlled by the PLC controller 13 to switch to the high-pressure pump 6 connected with one group of membrane shells 7 and the fifth electric valve 17 is controlled to switch to the working membrane shell 7 connected with the next group of pure water tanks 8, when the water level in the group of pure water tanks 8 reaches the high position, the second electric valve 9 is controlled by the PLC controller 13 to switch to the next group of pure water tanks 8 connected with the high-pressure pump 6 and the third electric valve 15 is controlled to switch to the high-pressure pump 6 connected with the other group of membrane shells 7, at this time, the pure water in the next group of pure water tanks 8 purified once is filtered by the other group of membrane shells 7 and sent to the above group of pure water tanks 8; Step five: when purifying tap water, when a higher purification speed is needed, the third electric valve 15 is controlled by the PLC controller 13 to switch to connect the high-pressure pump 6 with two groups of membrane shells 7 at the same time, at this time, the tap water is purified by two groups of membrane shells 7 at the same time, when a too high water purification speed is not needed, the third electric valve 15 is switched to connect the high-pressure pump 6 with one group of membrane shells 7, at this time, only one group of membrane shells 7 purifies water, when one group of membrane shells 7 is damaged, the third electric valve 15 is switched to connect the high-pressure pump 6 with the other group of membrane shells 7, at this time, the damaged membrane shell 7 can be repaired.

[0024] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water quality purification system based on two-stage membrane treatment, comprising a filter tank (3) and a PLC controller (13), characterized in that: The right side of the filter tank (3) is fixedly connected with a reclaimed water tank (4), the lower end of the reclaimed water tank (4) is fixedly connected with a security filter (5), the left end of the security filter (5) is fixedly connected with a high-pressure pump (6), a second electric valve (9) is fixedly connected on the water pipe between the security filter (5) and the high-pressure pump (6), the left end of the high-pressure pump (6) is fixedly connected with a third electric valve (15), the left end of the third electric valve (15) is fixedly connected with two groups of membrane shells (7), the upper ends of the membrane shells (7) are fixedly connected with a fifth electric valve (17) and a fourth electric valve (16), the left end of the fifth electric valve (17) is fixedly connected with two groups of pure water tanks (8), the lower end of the pure water tank (8) is fixedly connected with the second electric valve (9), the upper end of the fourth electric valve (16) is fixedly connected with a first electric valve (1), the left end of the first electric valve (1) is fixedly connected with a concentrated water drainage pipeline (11), the upper end of the first electric valve (1) is fixedly connected with a tap water pipeline (10), the right end of the tap water pipeline (10) is fixedly connected with an ultraviolet sterilizer (2), the right end of the ultraviolet sterilizer (2) is fixedly connected with the filter tank (3), the left and right sides of the filter tank (3) are fixedly connected with a circulating flushing valve (14), the left and right ends of the circulating flushing valve (14) are respectively fixedly connected with the water pipes on the left and right sides of the filter tank (3) and are in communication.

2. The water quality purification system based on a two-stage membrane treatment according to claim 1, characterized by, The inside of the reclaimed water tank (4) is fixedly connected with an electric conductivity sensor (12).

3. The water quality purification system based on a two-stage membrane treatment according to claim 2, characterized by, The first electric valve (1), the high-pressure pump (6), the second electric valve (9), the electric conductivity sensor (12), the third electric valve (15), the fourth electric valve (16), and the fifth electric valve (17) are all electrically connected with the PLC controller (13) through lines.

4. The water quality purification system based on a two-stage membrane treatment according to claim 3, characterized by, The membrane shell (7) comprises a vortex reverse osmosis assembly (71) and a quick disassembly connector (72), the upper end of the vortex reverse osmosis assembly (71) is fixedly connected with the fifth electric valve (17) and the fourth electric valve (16), the lower end of the vortex reverse osmosis assembly (71) is connected with the quick disassembly connector (72), and the lower end of the quick disassembly connector (72) is connected with the third electric valve (15).

5. The water quality purification system based on a two-stage membrane treatment according to claim 4, characterized by The vortex reverse osmosis assembly (71) comprises a shell (711), a vortex reverse osmosis membrane (712), a pure water pipe (713) and a concentrated water outlet pipe (714), the concentrated water outlet pipe (714) is fixedly connected at the middle opening of the top plate of the shell (711), the shell (711) is without a bottom plate, the middle part of the concentrated water outlet pipe (714) is connected with the pure water outlet pipe (715), the lower end of the pure water outlet pipe (715) penetrates through the top plate of the shell (711) and the height of the bottom of the pure water outlet pipe (715) is the same as the height of the inner top of the shell (711), the lower end of the pure water outlet pipe (715) is clamped with the pure water pipe (713) through a clamping block and a clamping groove, the pure water pipe (713) is connected with the pure water outlet pipe (715), the outer end of the pure water pipe (713) is fixedly connected with the vortex reverse osmosis membrane (712), the outer end of the vortex reverse osmosis membrane (712) is connected with the inner wall of the shell (711), the top of the vortex reverse osmosis membrane (712) is connected with the inner top of the shell (711), the vortex reverse osmosis membrane (712) is of a hollow structure and the inner end of the vortex reverse osmosis membrane (712) is connected with the pure water pipe (713), the vortex reverse osmosis membrane (712) and the lower end of the pure water pipe (713) are connected with the quick dismounting joint (72).

6. The water quality purification system based on a two-stage membrane treatment according to claim 5, characterized by The quick dismounting joint (72) comprises a clamping ring (721), a fixing ring (722), a bottom cover (723), a top plate (724), a connecting slide rod (725), a top ring (726), a water inlet pipe (727) and a threaded extrusion block (728), the lower end of the shell (711) is clamped with the clamping ring (721) through an annular clamping groove and an annular clamping block, the outer wall upper end of the clamping ring (721) and the outer wall lower end of the shell (711) are fixedly connected with the fixing ring (722), the two groups of fixing rings (722) are fixedly connected through bolts, the inner end of the clamping ring (721) is clamped with the bottom cover (723), the middle part of the bottom cover (723) is fixedly connected with the water inlet pipe (727), the upper end of the water inlet pipe (727) is threadedly connected with the threaded extrusion block (728) on the outer side, the upper end of the threaded extrusion block (728) is connected with the top ring (726), the upper end of the water inlet pipe (727) penetrates through the top ring (726), the top of the top ring (726) is fixedly connected with a plurality of groups of connecting slide rods (725), the connecting slide rods (725) penetrate through the bottom cover (723) and are slidingly connected with the bottom cover (723), the top of the connecting slide rods (725) is fixedly connected with the top plate (724), the top of the top plate (724) is connected with the vortex reverse osmosis membrane (712) and the pure water pipe (713) in a close contact manner.

7. The water quality purification system based on a two-stage membrane treatment according to claim 6, characterized by The diameter of the top plate (724) is smaller than the cross-sectional diameter of the shell (711), and the diameter of the top plate (724) is larger than the diameter of the middle opening of the top plate of the shell (711).

8. A control method of a water quality purification system based on a two-stage membrane treatment according to claim 7, characterized by: The specific steps are as follows: Step one: the tap water from the tap water pipeline (10) into the filter tank (3), while the tap water through ultraviolet sterilizer (2) disinfection, tap water through filter tank (3) and enter the water tank (4), through the water tank (4) to the water storage and at the same time through the conductivity sensor (12) to the water in the water tank (4) detection, then the water through the security filter (5) again and through the high pressure pump (6) and water pipe (727) to the shell (711) of the lower end, at this time the water through the top plate (724) of the outside into the vortex reverse osmosis membrane (712) in the interval, due to the vortex reverse osmosis membrane (712) of the upper end outside the top plate of the shell (711) is shielded, so that the water along the vortex direction of the vortex reverse osmosis membrane (712) to the inner end of the vortex reverse osmosis membrane (712) movement, in the process of the vortex reverse osmosis membrane (712) to the water continuously reverse osmosis filtration, so that the pure water continuously into the vortex reverse osmosis membrane (712) inside and into the pure water pipe (713), when the water movement to the concentrated water outlet pipe (714) below through the concentrated water outlet pipe (714) is out, pure water into the pure water outlet pipe (715) and is discharged, the concentrated water through the concentrated water outlet pipe (714) and water pipe into the first electric valve (1) and through the ultraviolet sterilizer (2) in the next cycle, the pure water through the fifth electric valve (17) is sent into the pure water tank (8) for storage; Step two: when the need to replace the vortex reverse osmosis membrane (712) loosen the bolt so that the snap ring (721) and the shell (711) is separated, at this time remove the vortex reverse osmosis membrane (712) and pure water pipe (713) for replacement can be, after the replacement of the vortex reverse osmosis membrane (712) and the shell (711) through the fixed ring (722) and bolted together, at this time rotate the threaded extrusion block (728), threaded extrusion block (728) drive the top ring (726) up movement, top ring (726) drive the connection slide bar (725) and top plate (724) up movement, so that the top plate (724) extrusion pure water pipe (713) and the vortex reverse osmosis membrane (712) up movement, so that the pure water pipe (713) and pure water outlet pipe (715) card joint, when the vortex reverse osmosis membrane (712) top fit in the top of the shell (711) when the completion of the vortex reverse osmosis membrane (712) fixed; Step three: when the membrane shell (7) needs to be cleaned, the first electric valve (1) is controlled by the PLC controller (13) to close the concentrated water drainage pipe (11) and the tap water pipe (10), the PLC controller (13) controls the circulating flushing valve (14) to open and controls the fifth electric valve (17) to disconnect with the pure water tank (8), at this time, the power of the high-pressure pump (6) is increased, the high-pressure pump (6) uses the middle water in the middle water tank (4) to continuously circulate to flush the membrane shell (7), and the electric conductivity sensor (12) is not stopped during this period. When the electric conductivity sensor (12) detects that the electric conductivity in the middle water tank (4) reaches the set value, stop flushing, at this time, most of the impurities in the membrane shell (7) are flushed out, at this time, the circulating flushing valve (14) is closed and the middle water in the middle water tank (4) is used to flush the filter tank (3) and the flushing water is discharged through the concentrated water drainage pipe (11), during the operation of the instrument, the second electric valve (9) is controlled by the PLC controller (13) to switch to the high-pressure pump (6) and the pure water tank (8) is connected and the high-pressure pump (6) and the safety filter (5) are disconnected, so that the pure water in the pure water tank (8) is sent to the inside of the membrane shell (7) by the high-pressure pump (6) to flush the membrane shell (7), and the impurities after flushing are discharged from the fourth electric valve (16), and the pure water after flushing enters the middle water tank (4) again, so that the circulating flushing of the membrane shell (7) is realized, and when the flushing is completed, the second electric valve (9) is controlled to switch to the high-pressure pump (6) and the safety filter (5) is connected; Step four: when the tap water quality is poor, the third electric valve (15) is switched to the high-pressure pump (6) to be connected with one group of membrane shells (7) by the PLC controller (13), and the fifth electric valve (17) is switched to the working membrane shell (7) and the next group of pure water tanks (8) are connected, when the water level in the group of pure water tanks (8) reaches the high position, the second electric valve (9) is controlled by the PLC controller (13) to switch to the next group of pure water tanks (8) and the high-pressure pump (6) is connected, and the third electric valve (15) is controlled to switch to the high-pressure pump (6) and the other group of membrane shells (7) are connected, at this time, the high-pressure pump (6) is used to filter the pure water in the next group of pure water tanks (8) which has been purified once and send it to the upper group of pure water tanks (8); Step five: when purifying tap water, when a higher purification speed is needed, the third electric valve (15) is switched to simultaneously connect the high-pressure pump (6) and the two groups of membrane shells (7) by the PLC controller (13), at this time, the tap water is purified by the two groups of membrane shells (7) at the same time, when the water purification speed is not too high, the third electric valve (15) is switched to the high-pressure pump (6) and only one group of membrane shells (7) are connected, at this time, only one group of membrane shells (7) is used for water purification, when one group of membrane shells (7) is damaged, the third electric valve (15) is switched to the high-pressure pump (6) and the other group of membrane shells (7) are connected, at this time, the damaged membrane shell (7) can be repaired.

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