A purified water production device that can recycle rinsing water

Abstract

This utility model discloses a purified water production device capable of recycling flushing water, comprising: a raw water tank, a primary reverse osmosis unit, a first switching valve group, a secondary reverse osmosis unit, a second switching valve group, an electro-deionization unit, a third switching valve group, a main discharge pipe, and a return water pipe; the raw water tank is provided with an inlet and an outlet; the return water pipe is connected to the inlet of the raw water tank; the primary reverse osmosis unit is provided with a first inlet end, a first concentrate end, and a first product water end, the first inlet end being connected to the outlet of the raw water tank; the first switching valve group is provided with a first valve group inlet, a first reflux port, and a first output port, the first valve group inlet being connected to the first product water end, and the first reflux port being connected to the return water pipe. This utility model enables the recycling and reuse of flushing water, reducing water waste and lowering production costs.

Description

Technical Field

[0001] This utility model relates to a purified water production device that can recycle rinse water. Background Technology

[0002] Currently, the pharmaceutical industry has increasingly stringent requirements for purified water quality. Purified water preparation systems typically include multi-stage reverse osmosis units and electro-deionization units. During the purified water production process, when the equipment switches from energy-saving mode to production mode, the conductivity of residual water in the pipelines increases due to the prolonged period of inactivity. Therefore, it is necessary to flush the first-stage reverse osmosis unit, the second-stage reverse osmosis unit, and the electro-deionization unit to ensure that the conductivity of the produced water meets the required standards.

[0003] In traditional purified water preparation systems, the flushing water from each stage of the equipment is typically discharged directly into the wastewater pipe, resulting in a significant waste of water resources. This is especially problematic for high-capacity purified water machines, as it does not comply with national energy conservation and emission reduction requirements.

[0004] After searching the existing technology, Chinese patent CN218969018U was found to disclose a high-recovery-rate pure water treatment device, which achieves the recycling of concentrated water by setting up a concentrated water recovery device and multiple control valves. However, this device mainly targets the recovery of concentrated water during normal production processes and fails to solve the problem of water waste during the equipment start-up and flushing phase. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a purified water production equipment that can recycle rinsing water, thereby reducing water waste and lowering production costs.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a purified water production equipment that can recycle flushing water, including: a raw water tank, a primary reverse osmosis device, a first switching valve group, a secondary reverse osmosis device, a second switching valve group, an electro-deionization device, a third switching valve group, a discharge main pipe and a return water pipe.

[0007] The raw water tank is equipped with an inlet and an outlet;

[0008] The return water pipe is connected to the inlet of the raw water tank;

[0009] The first-stage reverse osmosis device is provided with a first inlet end, a first concentrate end and a first product water end, and the first inlet end is connected to the outlet of the raw water tank;

[0010] The first switching valve group is provided with a first valve group inlet, a first reflux port and a first output port. The first valve group inlet is connected to the first water production end, the first reflux port is connected to the return water pipe, and the first switching valve group is adapted to switch between the first water production end being connected to the return water pipe and the first water production end being connected to the first output port.

[0011] The secondary reverse osmosis device is provided with a second inlet, a second concentrate, and a second product water. The second inlet is connected to the first output port of the first switching valve group, and the second concentrate is connected to the first inlet.

[0012] The second switching valve group is provided with a second valve group inlet, a flushing return port and a second output port. The second valve group inlet is connected to the second water production end, and the flushing return port is connected to the return water pipe. The second switching valve group is adapted to switch between the second water production end being connected to the return water pipe and the second water production end being connected to the second output port.

[0013] The electro-deionization device is provided with an electro-deionization inlet, a concentrate outlet, and a desalination outlet. The electro-deionization inlet is connected to the second output port of the second switching valve group, and the concentrate outlet is connected to the inlet of the raw water tank.

[0014] The third switching valve group is provided with a third valve group inlet, a third reflux port and a pure water outlet. The third valve group inlet is connected to the fresh water outlet, the third reflux port is connected to the return water pipe, and the third switching valve group is adapted to switch between the fresh water outlet being connected to the return water pipe and the fresh water outlet being connected to the pure water outlet.

[0015] The main discharge pipe is connected to the first concentrated water end.

[0016] Furthermore, the purified water production equipment that can recycle rinsing water also includes a controller;

[0017] The first switching valve group includes a first conductivity detector, a first control valve, and a second control valve;

[0018] The first conductivity detector is installed at the first product water end of the first-stage reverse osmosis unit. The first conductivity detector is adapted to detect the conductivity of the product water at the first product water end and emit a first conductivity signal.

[0019] The inlet of the first control valve is connected to the first water production end, and the outlet of the first control valve is connected to the return water pipe.

[0020] The inlet of the second control valve is connected to the first water production end, and the outlet of the second control valve is connected to the second water inlet end;

[0021] The controller is connected to the first conductivity detector, the first control valve, and the second control valve respectively. The controller is adapted to control the first control valve and the second control valve to operate according to the first conductivity signal of the first conductivity detector.

[0022] Wherein, the inlet of the first valve group is the inlet of the first control valve and the second control valve, the first reflux port is the outlet of the first control valve, and the first output port is the outlet of the second control valve.

[0023] Furthermore, a specific structure of a second switching valve group is provided, the second switching valve group including a second conductivity detector, a fourth control valve and a fifth control valve;

[0024] The second conductivity detector is installed at the inlet of the second valve group. The second conductivity detector is adapted to detect the conductivity of the product water at the second product water end and send out a second conductivity signal.

[0025] The inlet of the fourth control valve is connected to the second water production end, and the outlet of the fourth control valve is connected to the return water pipe.

[0026] The inlet of the fifth control valve is connected to the second water production end, and the outlet of the fifth control valve is connected to the electro-deionization inlet.

[0027] The controller is connected to the second conductivity detector, the fourth control valve, and the fifth control valve respectively. The controller is adapted to control the operation of the fourth control valve and the fifth control valve according to the second conductivity signal of the second conductivity detector.

[0028] Wherein, the inlet of the second valve group is the inlet of the fourth control valve and the fifth control valve, the flushing return port is the outlet of the fourth control valve, and the second output port is the outlet of the fifth control valve.

[0029] Furthermore, a specific structure of a third switching valve group is provided, the third switching valve group including a third conductivity detector, a sixth control valve and a seventh control valve;

[0030] The third conductivity detector is installed at the freshwater outlet of the electro-deionization device. The third conductivity detector is adapted to detect the conductivity of the product water at the freshwater outlet and emit a third conductivity signal.

[0031] The inlet of the sixth control valve is connected to the fresh water outlet, and the outlet of the sixth control valve is connected to the return water pipe.

[0032] The inlet of the seventh control valve is connected to the fresh water outlet, and the outlet of the seventh control valve is a pure water output port.

[0033] The controller is connected to the third conductivity detector, the sixth control valve, and the seventh control valve respectively. The controller is adapted to control the sixth control valve and the seventh control valve to operate according to the third conductivity signal of the third conductivity detector.

[0034] Wherein, the inlet of the third valve group is the inlet of the sixth control valve and the seventh control valve, the third reflux port is the outlet of the sixth control valve, and the pure water output port is the outlet of the seventh control valve.

[0035] Furthermore, a specific structure of a fourth switching valve group is provided. The purified water production equipment for recovering flushing water also includes a fourth switching valve group. The fourth switching valve group is provided with a fourth valve group inlet, an electro-deionized concentrate return port, and a concentrate flushing discharge port. The fourth valve group inlet is connected to the concentrate outlet, the electro-deionized concentrate return port is connected to the inlet of the raw water tank, and the concentrate flushing discharge port is connected to the discharge main pipe. The fourth switching valve group is adapted to switch between the connection between the concentrate outlet and the raw water tank and the connection between the concentrate outlet and the discharge main pipe.

[0036] Furthermore, the fourth switching valve group includes an eighth control valve and a ninth control valve;

[0037] The inlet of the eighth control valve is connected to the concentrated water outlet, and the outlet of the eighth control valve is connected to the inlet of the raw water tank.

[0038] The inlet of the ninth control valve is connected to the concentrate outlet, and the outlet of the ninth control valve is connected to the discharge main pipe;

[0039] Wherein, the inlet of the fourth valve group is the inlet of the eighth control valve and the ninth control valve, the electro-deionized concentrate reflux port is the outlet of the eighth control valve, and the concentrate flushing discharge port is the outlet of the ninth control valve.

[0040] Furthermore, the purified water production equipment for recyclable flushing water also includes a first check valve, a second check valve, and a third check valve;

[0041] The first check valve is installed on the pipeline connecting the first return port and the return water pipe;

[0042] The second check valve is installed on the pipeline connecting the flushing return port and the return water pipe;

[0043] The third check valve is installed on the pipeline connecting the third return port and the return water pipe.

[0044] By adopting the above technical solution, this utility model has the following beneficial effects:

[0045] In this invention, before production, the conductivity of the equipment increases due to prolonged inactivity. To reduce the conductivity to the acceptable level, raw water enters the first inlet of the primary reverse osmosis unit from the outlet of the raw water tank. The water produced at the first product water end is switched via a first switching valve group according to the water quality. When the water quality is substandard, the first switching valve group connects the first product water end to the return water pipe, allowing the flushing water to flow back to the inlet of the raw water tank. When the water quality is acceptable, the first switching valve group connects the first product water end to the first outlet, allowing the qualified water to enter the second inlet of the secondary reverse osmosis unit. The water treated by the secondary reverse osmosis unit flows out from the second product water end and undergoes a similar path switch via the second switching valve group. Unacceptable water flows into the return water pipe for recycling through the flushing return port, while qualified water enters the electro-deionization inlet of the electro-deionization unit through the second outlet. After treatment by the electrodeionization unit, the fresh water flows out from the fresh water outlet and undergoes a final path switching via the third switching valve group. Unqualified water enters the return water pipeline through the third reflux port, while qualified water is output from the pure water outlet as the finished purified water. Simultaneously, the second concentrate end of the secondary reverse osmosis unit is connected to the first inlet end for concentrate reuse, and the concentrate outlet of the electrodeionization unit is connected to the raw water tank inlet for concentrate recovery. The first concentrate end of the primary reverse osmosis unit is connected to the discharge main pipe to discharge wastewater.

[0046] The first check valve is installed on the pipeline connecting the first return port and the return water pipe to prevent water in the return water pipe from flowing back into the first switching valve group. The second check valve is installed on the pipeline connecting the flushing return port and the return water pipe to prevent water in the return water pipe from flowing back into the second switching valve group. The third check valve is installed on the pipeline connecting the third return port and the return water pipe to prevent water in the return water pipe from flowing back into the third switching valve group, ensuring unidirectional flow in the system.

[0047] In summary, this invention not only ensures the quality of produced water but also reduces water waste, achieving the recycling of rinsing water during the purified water production process. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the structure of the purified water production equipment for recyclable rinsing water according to this utility model;

[0049] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0050] Figure 3 for Figure 1 A magnified view of part B in the middle section;

[0051] Figure 4 for Figure 1 A magnified view of part C in the middle;

[0052] Figure 5 for Figure 1A magnified view of part D in the middle. Detailed Implementation

[0053] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0054] Example 1: As Figure 1-5 As shown, a purified water production equipment that can recycle flushing water includes: a raw water tank 1, a primary reverse osmosis unit 2, a first switching valve group, a secondary reverse osmosis unit 3, a second switching valve group, an electro-deionization unit 4, a third switching valve group, a discharge main pipe 5, and a return water pipe 6.

[0055] The raw water tank 1 is equipped with an inlet and an outlet;

[0056] The return water pipe 6 is connected to the inlet of the raw water tank 1;

[0057] The first-stage reverse osmosis unit 2 is provided with a first inlet end 21, a first concentrate end 22 and a first product water end 23. The first inlet end 21 is connected to the outlet of the raw water tank 1.

[0058] The first switching valve group is provided with a first valve group inlet, a first reflux port and a first output port. The first valve group inlet is connected to the first water production end 23, and the first reflux port is connected to the return water pipe 6. The first switching valve group is suitable for switching between the first water production end 23 being connected to the return water pipe 6 and the first water production end 23 being connected to the first output port.

[0059] The secondary reverse osmosis unit 3 is provided with a second inlet 31, a second concentrate 32 and a second product water 33. The second inlet 31 is connected to the first output port of the first switching valve group, and the second concentrate 32 is connected to the first inlet 21.

[0060] The second switching valve group is provided with a second valve group inlet, a flushing return port and a second output port. The second valve group inlet is connected to the second water production end 33, and the flushing return port is connected to the return water pipe 6. The second switching valve group is suitable for switching between the second water production end 33 being connected to the return water pipe 6 and the second water production end 33 being connected to the second output port.

[0061] The electro-deionization device 4 is equipped with an electro-deionization inlet 41, a concentrate outlet 42, and a desalination outlet 43. The electro-deionization inlet 41 is connected to the second output port of the second switching valve group, and the concentrate outlet 42 is connected to the inlet of the raw water tank 1.

[0062] The third switching valve group is equipped with a third valve group inlet, a third reflux port and a pure water outlet. The third valve group inlet is connected to the fresh water outlet 43, and the third reflux port is connected to the return water pipe 6. The third switching valve group is suitable for switching between the fresh water outlet 43 being connected to the return water pipe 6 and the fresh water outlet 43 being connected to the pure water outlet.

[0063] The main discharge pipe 5 is connected to the first concentrated water end 22.

[0064] In this embodiment, as Figure 1-2 As shown, before production, the conductivity of the equipment increases due to prolonged inactivity. To reduce the conductivity to the acceptable level, raw water enters the first inlet 21 of the first-stage reverse osmosis unit 2 from the outlet of the raw water tank 1. The water produced at the first product water end 23 is switched via a first switching valve group according to the water quality. When the water quality is substandard, the first switching valve group connects the first product water end 23 to the return water pipe 6, allowing the flushing water to flow back to the inlet of the raw water tank 1 via the return water pipe 6. When the water quality is acceptable, the first switching valve group connects the first product water end 23 to the first outlet, allowing the acceptable water to enter the second inlet 31 of the second-stage reverse osmosis unit 3. The water treated by the second-stage reverse osmosis unit 3 flows out from the second product water end 33 and undergoes a similar path switching via the second switching valve group. Unacceptable water flows into the return water pipe 6 for recycling via the flushing return port, while acceptable water enters the electro-deionization inlet 41 of the electro-deionization unit 4 via the second outlet. After treatment by the electrodeionization unit 4, the fresh water flows out from the fresh water outlet 43 and undergoes a final path switch via the third switching valve group. Unqualified water enters the return water pipe 6 through the third return port, while qualified water is output from the pure water outlet as the finished purified water. Simultaneously, the second concentrate end 32 of the secondary reverse osmosis unit 3 is connected to the first inlet end 21 for concentrate reuse. The concentrate outlet 42 of the electrodeionization unit 4 is connected to the inlet of the raw water tank 1 to recover the concentrate. The first concentrate end 22 of the primary reverse osmosis unit 2 is connected to the discharge main pipe 5 to discharge wastewater.

[0065] Specifically, such as Figure 1-2 As shown, the purified water production equipment that can recycle rinsing water also includes a controller;

[0066] The first switching valve group includes a first conductivity detector 71, a first control valve 72, and a second control valve 73;

[0067] The first conductivity detector 71 is installed at the first product water end 23 of the first-stage reverse osmosis unit 2. The first conductivity detector 71 is adapted to detect the conductivity of the product water at the first product water end 23 and send out a first conductivity signal.

[0068] The inlet of the first control valve 72 is connected to the first water production end 23, and the outlet of the first control valve 72 is connected to the return water pipe 6.

[0069] The inlet of the second control valve 73 is connected to the first water production end 23, and the outlet of the second control valve 73 is connected to the second water inlet end 31.

[0070] The controller is connected to the first conductivity detector 71, the first control valve 72, and the second control valve 73 respectively. The controller is adapted to control the first control valve 72 and the second control valve 73 to operate according to the first conductivity signal of the first conductivity detector 71.

[0071] The first valve group inlet is the inlet of the first control valve 72 and the second control valve 73, the first return port is the outlet of the first control valve 72, and the first output port is the outlet of the second control valve 73.

[0072] In this embodiment, as Figure 1-2 As shown, the first switching valve group monitors the conductivity of the water produced by the first-stage reverse osmosis unit 2 in real time through the first conductivity detector 71. When the equipment switches from energy-saving mode to production mode initially, due to the high conductivity of the residual water in the pipeline, the controller judges the water quality based on the first conductivity signal sent by the first conductivity detector 71. When the detected conductivity value is higher than the set threshold, the controller controls the first control valve 72 to open, while the second control valve 73 closes. At this time, the flushing water produced by the first water production end 23 flows into the return water pipe 6 through the first control valve 72 and finally returns to the inlet of the raw water tank 1. After flushing for a period of time, when the first conductivity detector 71 detects that the conductivity value has decreased to the acceptable range, the controller controls the first control valve 72 to close and the second control valve 73 to open. The acceptable water from the first water production end 23 flows to the second inlet 31 of the second-stage reverse osmosis unit 3 through the second control valve 73 for further processing.

[0073] In this embodiment, the controller is a PLC controller.

[0074] Specifically, such as Figure 1-2 As shown, the second switching valve group includes a second conductivity detector 81, a fourth control valve 83, and a fifth control valve 84;

[0075] The second conductivity detector 81 is installed at the inlet of the second valve group. The second conductivity detector 81 is adapted to detect the conductivity of the produced water at the second produced water end 33 and send out a second conductivity signal.

[0076] The inlet of the fourth control valve 83 is connected to the second water production end 33, and the outlet of the fourth control valve 83 is connected to the return water pipe 6.

[0077] The inlet of the fifth control valve 84 is connected to the second product water end 33, and the outlet of the fifth control valve 84 is connected to the electro-deionization inlet 41.

[0078] The controller is connected to the second conductivity detector 81, the fourth control valve 83 and the fifth control valve 84 respectively. The controller is adapted to control the operation of the fourth control valve 83 and the fifth control valve 84 according to the second conductivity signal of the second conductivity detector 81.

[0079] The second valve group inlet is the inlet of the fourth control valve 83 and the fifth control valve 84, the flushing return port is the outlet of the fourth control valve 83, and the second output port is the outlet of the fifth control valve 84.

[0080] In this embodiment, as Figure 1-2 As shown, the working principle of the second switching valve group is similar to that of the first switching valve group. The conductivity of the permeate water from the secondary reverse osmosis unit 3 is monitored by the second conductivity detector 81. When the secondary reverse osmosis unit 3 starts receiving water from the first output port of the first switching valve group, the controller controls the fourth control valve 83 to open and the fifth control valve 84 to close according to the second conductivity signal from the second conductivity detector 81. This allows the flushing water from the second permeate end 33 to flow into the return water pipe 6 for recycling through the fourth control valve 83. When the second conductivity detector 81 detects that the conductivity has reached the set standard, the controller controls the fourth control valve 83 to close and the fifth control valve 84 to open. The qualified permeate water flows through the fifth control valve 84 to the deionization inlet 41 of the deionization unit 4.

[0081] This embodiment also includes a third control valve 82. The inlet of the third control valve 82 is connected to the second product water end 33, and the outlet is connected to the first water inlet 21 of the first-stage reverse osmosis device 2. The controller can close the fourth control valve 83 and the fifth control valve 84 and open the third control valve 82 for product water reflux to dilute the inlet water.

[0082] Specifically, such as Figure 1-2 As shown, the third switching valve group includes a third conductivity detector 91, a sixth control valve 92, and a seventh control valve 93;

[0083] The third conductivity detector 91 is installed at the fresh water outlet 43 of the electro-deionization device 4. The third conductivity detector 91 is suitable for detecting the conductivity of the product water at the fresh water outlet 43 and emitting a third conductivity signal.

[0084] The inlet of the sixth control valve 92 is connected to the fresh water outlet 43, and the outlet of the sixth control valve 92 is connected to the return water pipe 6.

[0085] The inlet of the seventh control valve 93 is connected to the fresh water outlet 43, and the outlet of the seventh control valve 93 is a pure water output port.

[0086] The controller is connected to the third conductivity detector 91, the sixth control valve 92 and the seventh control valve 93 respectively. The controller is adapted to control the sixth control valve 92 and the seventh control valve 93 to operate according to the third conductivity signal of the third conductivity detector 91.

[0087] The inlet of the third valve group is the inlet of the sixth control valve 92 and the seventh control valve 93, the third return port is the outlet of the sixth control valve 92, and the pure water output port is the outlet of the seventh control valve 93.

[0088] In this embodiment, as Figure 1-2 As shown, when the electro-deionization device 4 begins receiving water from the second output port of the second switching valve group, the controller first controls the sixth control valve 92 to open and the seventh control valve 93 to close, allowing the water from the freshwater outlet 43 to flow into the return water pipe 6 for recycling via the sixth control valve 92. During the rinsing process, the third conductivity detector 91 monitors the conductivity of the produced water at the freshwater outlet 43 and sends a third conductivity signal to the controller. The controller judges the water quality based on the received conductivity signal. When the conductivity value meets the requirements, the controller controls the sixth control valve 92 to close and the seventh control valve 93 to open, switching the flow path to normal production mode.

[0089] Specifically, such as Figure 1-2 As shown, the purified water production equipment that can recycle flushing water also includes a first check valve 74, a second check valve 85, and a third check valve 94;

[0090] The first check valve 74 is installed on the pipeline connecting the first return port and the return water pipe 6;

[0091] The second check valve 85 is installed on the pipeline connecting the flushing return port and the return water pipe 6;

[0092] The third check valve 94 is installed on the pipeline connecting the third return port and the return water pipe 6.

[0093] In this embodiment, as Figure 1-2 As shown, the first check valve 74 is installed on the connecting pipe between the outlet of the first control valve 72 and the return water pipe 6. When the first control valve 72 is closed, the first check valve 74 prevents the return water discharged from other switching valve groups in the return water pipe 6 from flowing back into the first switching valve group. The second check valve 85 is installed on the connecting pipe between the outlet of the fourth control valve 83 and the return water pipe 6 to prevent the return water from flowing back into the second switching valve group. The third check valve 94 is installed on the connecting pipe between the outlet of the sixth control valve 92 and the return water pipe 6 to prevent the return water from flowing back into the third switching valve group.

[0094] Example 2 is basically the same as Example 1, except that:

[0095] Specifically, such as Figure 1-2 As shown, the purified water production equipment with recyclable flushing water also includes a fourth switching valve group. The fourth switching valve group is equipped with a fourth valve group inlet, an electro-deionized concentrate return port, and a concentrate flushing discharge port. The fourth valve group inlet is connected to the concentrate outlet 42, the electro-deionized concentrate return port is connected to the inlet of the raw water tank 1, and the concentrate flushing discharge port is connected to the discharge main pipe 5. The fourth switching valve group is suitable for switching between the concentrate outlet 42 being connected to the raw water tank 1 and the concentrate outlet 42 being connected to the discharge main pipe 5.

[0096] Specifically, such as Figure 1-2 As shown, the fourth switching valve group includes an eighth control valve 101 and a ninth control valve 102;

[0097] The inlet of the eighth control valve 101 is connected to the concentrate outlet 42, and the outlet of the eighth control valve 101 is connected to the inlet of the raw water tank 1.

[0098] The inlet of the ninth control valve 102 is connected to the concentrate outlet 42, and the outlet of the ninth control valve 102 is connected to the discharge main pipe 5.

[0099] The inlet of the fourth valve group is the inlet of the eighth control valve 101 and the ninth control valve 102, the electro-deionized concentrate return port is the outlet of the eighth control valve 101, and the concentrate flushing discharge port is the outlet of the ninth control valve 102.

[0100] In this embodiment, as Figure 1-2 As shown, in the normal production mode of the equipment, the controller controls the eighth control valve 101 to open and the ninth control valve 102 to close. At this time, the concentrated water discharged from the concentrated water outlet 42 of the electro-deionization unit 4 flows into the inlet of the raw water tank 1 through the eighth control valve 101 for recycling. In the equipment flushing mode, especially when restarting after a long period of shutdown, the controller controls the eighth control valve 101 to close and the ninth control valve 102 to open. The concentrated water is directly discharged into the discharge main pipe 5 through the ninth control valve 102 to discharge the system.

[0101] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A purified water production device capable of recovering rinse water, characterized in that, include: Raw water tank (1), primary reverse osmosis unit (2), first switching valve group, secondary reverse osmosis unit (3), second switching valve group, electro-deionization unit (4), third switching valve group, main discharge pipe (5) and return water pipe (6); The raw water tank (1) is equipped with an inlet and an outlet; The return water pipe (6) is connected to the inlet of the raw water tank (1); The first-stage reverse osmosis device (2) is provided with a first water inlet (21), a first concentrate end (22) and a first product water end (23), and the first water inlet (21) is connected to the outlet of the raw water tank (1); The first switching valve group is provided with a first valve group inlet, a first reflux port and a first output port. The first valve group inlet is connected to the first water production end (23), the first reflux port is connected to the return water pipe (6), and the first switching valve group is adapted to switch between the first water production end (23) being connected to the return water pipe (6) and the first water production end (23) being connected to the first output port. The secondary reverse osmosis device (3) is provided with a second inlet (31), a second concentrate (32) and a second product water (33). The second inlet (31) is connected to the first output port of the first switching valve group, and the second concentrate (32) is connected to the first inlet (21). The second switching valve group is provided with a second valve group inlet, a flushing return port and a second output port. The second valve group inlet is connected to the second water production end (33), and the flushing return port is connected to the return water pipe (6). The second switching valve group is adapted to switch between the second water production end (33) being connected to the return water pipe (6) and the second water production end (33) being connected to the second output port. The electro-deionization device (4) is provided with an electro-deionization inlet (41), a concentrate outlet (42) and a desalination outlet (43). The electro-deionization inlet (41) is connected to the second output port of the second switching valve group, and the concentrate outlet (42) is connected to the inlet of the raw water tank (1). The third switching valve group is provided with a third valve group inlet, a third reflux port and a pure water outlet. The third valve group inlet is connected to the fresh water outlet (43), the third reflux port is connected to the return water pipe (6), and the third switching valve group is adapted to switch between the fresh water outlet (43) being connected to the return water pipe (6) and the fresh water outlet (43) being connected to the pure water outlet. The main discharge pipe (5) is connected to the first concentrated water end (22).

2. The purified water production equipment for recyclable rinsing water according to claim 1, characterized in that: It also includes the controller; The first switching valve group includes a first conductivity detector (71), a first control valve (72), and a second control valve (73); The first conductivity detector (71) is installed at the first product water end (23) of the first-stage reverse osmosis device (2). The first conductivity detector (71) is adapted to detect the product water conductivity of the first product water end (23) and emit a first conductivity signal. The inlet of the first control valve (72) is connected to the first water production end (23), and the outlet of the first control valve (72) is connected to the return water pipe (6). The inlet of the second control valve (73) is connected to the first water production end (23), and the outlet of the second control valve (73) is connected to the second water inlet end (31); The controller is connected to the first conductivity detector (71), the first control valve (72) and the second control valve (73) respectively. The controller is adapted to control the first control valve (72) and the second control valve (73) to operate according to the first conductivity signal of the first conductivity detector (71). Wherein, the inlet of the first valve group is the inlet of the first control valve (72) and the second control valve (73), the first return port is the outlet of the first control valve (72), and the first output port is the outlet of the second control valve (73).

3. The purified water production equipment for recyclable rinsing water according to claim 2, characterized in that: The second switching valve group includes a second conductivity detector (81), a fourth control valve (83) and a fifth control valve (84). The second conductivity detector (81) is installed at the inlet of the second valve group. The second conductivity detector (81) is adapted to detect the conductivity of the produced water at the second produced water end (33) and send out a second conductivity signal. The inlet of the fourth control valve (83) is connected to the second water production end (33), and the outlet of the fourth control valve (83) is connected to the return water pipe (6). The inlet of the fifth control valve (84) is connected to the second water production end (33), and the outlet of the fifth control valve (84) is connected to the electro-deionization inlet (41). The controller is connected to the second conductivity detector (81), the fourth control valve (83) and the fifth control valve (84) respectively. The controller is adapted to control the fourth control valve (83) and the fifth control valve (84) to operate according to the second conductivity signal of the second conductivity detector (81). Wherein, the inlet of the second valve group is the inlet of the fourth control valve (83) and the fifth control valve (84), the flushing return port is the outlet of the fourth control valve (83), and the second output port is the outlet of the fifth control valve (84).

4. The purified water production equipment for recyclable rinsing water according to claim 2, characterized in that: The third switching valve group includes a third conductivity detector (91), a sixth control valve (92), and a seventh control valve (93). The third conductivity detector (91) is installed at the fresh water outlet (43) of the electro-deionization device (4). The third conductivity detector (91) is adapted to detect the conductivity of the product water at the fresh water outlet (43) and emit a third conductivity signal. The inlet of the sixth control valve (92) is connected to the fresh water outlet (43), and the outlet of the sixth control valve (92) is connected to the return water pipe (6). The inlet of the seventh control valve (93) is connected to the fresh water outlet (43), and the outlet of the seventh control valve (93) is a pure water output port; The controller is connected to the third conductivity detector (91), the sixth control valve (92) and the seventh control valve (93) respectively. The controller is adapted to control the sixth control valve (92) and the seventh control valve (93) to operate according to the third conductivity signal of the third conductivity detector (91). The inlet of the third valve group is the inlet of the sixth control valve (92) and the seventh control valve (93), the third reflux port is the outlet of the sixth control valve (92), and the pure water outlet is the outlet of the seventh control valve (93).

5. The purified water production equipment for recyclable rinsing water according to claim 2, characterized in that: It also includes a fourth switching valve group, which is provided with a fourth valve group inlet, an electro-deionized concentrate return port and a concentrate flushing discharge port. The fourth valve group inlet is connected to the concentrate outlet (42), the electro-deionized concentrate return port is connected to the inlet of the raw water tank (1), and the concentrate flushing discharge port is connected to the discharge main pipe (5). The fourth switching valve group is adapted to switch between the connection between the concentrate outlet (42) and the raw water tank (1) and the connection between the concentrate outlet (42) and the discharge main pipe (5).

6. The purified water production equipment for recyclable rinsing water according to claim 5, characterized in that: The fourth switching valve group includes an eighth control valve (101) and a ninth control valve (102). The inlet of the eighth control valve (101) is connected to the concentrated water outlet (42), and the outlet of the eighth control valve (101) is connected to the inlet of the raw water tank (1). The inlet of the ninth control valve (102) is connected to the concentrated water outlet (42), and the outlet of the ninth control valve (102) is connected to the discharge main pipe (5). The inlet of the fourth valve group is the inlet of the eighth control valve (101) and the ninth control valve (102), the electro-deionized concentrate return port is the outlet of the eighth control valve (101), and the concentrate flushing discharge port is the outlet of the ninth control valve (102).

7. The purified water production equipment for recyclable rinsing water according to claim 1, characterized in that: It also includes a first check valve (74), a second check valve (85) and a third check valve (94); The first check valve (74) is installed on the pipeline connecting the first return port and the return water pipe (6); The second check valve (85) is installed on the pipeline connecting the flushing return port and the return water pipe (6); The third check valve (94) is installed on the pipeline connecting the third return port and the return water pipe (6).

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