Reverse osmosis device

Abstract

The utility model discloses a reverse osmosis device. The first reverse osmosis membrane assembly comprises a first water port and a second water port, the first water port is connected between the first valve and the second valve of the first pipe section, and the second water port is connected between the third valve and the fourth valve of the fourth pipe section; the reverse osmosis membrane assembly II comprises a third water port and a fourth water port, the third water port is connected between the fifth valve and the sixth valve of the second pipe section, and the fourth water port is connected between the seventh valve and the eighth valve of the fifth pipe section; the third reverse osmosis membrane assembly comprises a fifth water port and a sixth water port, the fifth water port is connected between the ninth valve and the tenth valve of the third pipe section, and the sixth water port is connected between the eleventh valve and the twelfth valve of the sixth pipe section. According to the reverse osmosis device provided by the invention, the internal directions and positions of the first-stage and second-stage reverse osmosis are dynamically adjusted, the reverse osmosis membrane assemblies are standby for each other, the concentration polarization problem of a membrane system is reduced, the use of a cleaning agent is reduced, and the recovery rate is improved.

Description

Technical Field

[0001] The present application relates to the field of osmotic recovery technology, and in particular to a reverse osmosis device. Background Art

[0002] Reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses pressure difference as a driving force to separate solvents from solutions. Because it is in the opposite direction of natural osmosis, it is called reverse osmosis.

[0003] According to the osmotic pressure of various materials, a reverse osmosis pressure greater than the osmotic pressure is used, i.e., reverse osmosis, to achieve the purpose of separation, extraction, purification, and concentration. Existing conventional reverse osmosis systems are generally arranged in a one-stage two-stage configuration. The general process is arranged as a series of flushing sections one and two, with reverse osmosis membrane assembly one, reverse osmosis membrane assembly two, and reverse osmosis membrane assembly three. Such a process configuration is relatively simple. When all valves are open, it is possible to achieve influent entering from the reverse osmosis membrane assembly one and reverse osmosis membrane assembly two (flushing section one) series, and concentrated water from the reverse osmosis membrane assembly one and reverse osmosis membrane assembly two series entering the reverse osmosis membrane assembly three (flushing section two) series. After a certain period of operation, the membrane will produce concentration polarization due to concentration, resulting in a decrease in throughput and performance degradation. Since the reverse osmosis membrane is very dense, during use, due to the presence of a certain amount of organic matter and inorganic salts in the influent, the reverse osmosis membrane will be fouled and blocked by concentration, resulting in a decrease in recovery rate, a decrease in salt rejection rate, and an increase in operating pressure. The membrane is forced to undergo chemical cleaning to restore flux, which also affects the overall throughput of the membrane system. Utility Model Content

[0004] The purpose of the present application is to provide a reverse osmosis device, which can dynamically adjust the direction and position of the two sections of the reverse osmosis stage in reverse osmosis membrane assembly 1, reverse osmosis membrane assembly 2 and reverse osmosis membrane assembly 3, so as to realize that reverse osmosis membrane assembly 1, reverse osmosis membrane assembly 2 and reverse osmosis membrane assembly 3 serve as backup for each other, reduce the concentration polarization problem of the membrane system, reduce the use of cleaning agents, increase the overall processing capacity of the reverse osmosis membrane, and improve the recovery rate.

[0005] A reverse osmosis device provided by the technical solution of the present application includes: a liquid reservoir, a flushing pipe connected to the liquid reservoir, and a liquid inlet pump connected to the flushing pipe; the flushing pipe is also connected to a first pipe section, a second pipe section, a third pipe section, a fourth pipe section, a fifth pipe section and a sixth pipe section arranged in parallel; a reverse osmosis membrane assembly one, the reverse osmosis membrane assembly one including a first water inlet and a second water inlet arranged oppositely, the first water inlet being connected between the first valve and the second valve of the first pipe section, and the second water inlet being connected between the third valve and the fourth valve of the fourth pipe section; a reverse osmosis membrane assembly two, the reverse osmosis membrane assembly two including a third water inlet and a fourth water inlet arranged oppositely, the third water inlet being connected between the fifth valve and the sixth valve of the second pipe section, and the fourth water inlet being connected between the seventh valve and the eighth valve of the fifth pipe section; a reverse osmosis membrane assembly three, the reverse osmosis membrane assembly three including a fifth water inlet and a sixth water inlet arranged oppositely, the fifth water inlet being connected between the ninth valve and the tenth valve of the third pipe section, and the sixth water inlet being connected between the eleventh valve and the twelfth valve of the sixth pipe section.

[0006] Optionally, the first pipe segment, the second pipe segment and the third pipe segment are divided into a first group of pipe segments, the fourth pipe segment, the fifth pipe segment and the sixth pipe segment are divided into a second group of pipe segments, and a thirteenth valve is provided on the portion of the flushing pipe located between the first group of pipe segments and the second group of pipe segments.

[0007] Optionally, the reverse osmosis device further includes a cleaning pipe, and the fourth pipe segment, the fifth pipe segment and the sixth pipe segment are all connected in parallel to the cleaning pipe.

[0008] Optionally, the reverse osmosis device further includes a concentrated water pipe, the first pipe section, the second pipe section, and the third pipe section are connected in parallel to the concentrated water pipe, and the cleaning pipe is connected to the concentrated water pipe.

[0009] Optionally, a fifteenth valve is provided on the concentrated water pipe.

[0010] Optionally, a fourteenth valve is provided on the cleaning pipe.

[0011] Optionally, the reverse osmosis device further comprises a washer, in which a cleaning liquid is stored. The washer is connected to the flushing pipe via a connecting pipe, and a driving pump is provided on the connecting pipe.

[0012] Optionally, the cleaning pipe is connected to the cleaner.

[0013] Optionally, the reverse osmosis device further includes a water production pipe, and outlets of the reverse osmosis membrane assembly 1, the reverse osmosis membrane assembly 2, and the reverse osmosis membrane assembly 3 are all connected in parallel to the water production pipe.

[0014] Optionally, the water production pipe is connected to the cleaner.

[0015] The above technical solution has the following beneficial effects:

[0016] The reverse osmosis device provided by the present application is realized by dynamically adjusting the direction and position of the reverse osmosis first-stage two sections in the reverse osmosis membrane assembly one, the reverse osmosis membrane assembly two and the reverse osmosis membrane assembly three, through the first pipe section, the second pipe section, the third pipe section, the fourth pipe section, the fifth pipe section and the sixth pipe section arranged in parallel on the flushing pipe, and the first valve and the second valve located on the first pipe section, the third valve and the fourth valve located on the fourth pipe section, the fifth valve and the sixth valve located on the second pipe section, the seventh valve and the eighth valve located on the fifth pipe section, the ninth valve and the tenth valve located on the third pipe section and the eleventh valve and the twelfth valve located on the sixth pipe section, so as to realize the reverse osmosis membrane assembly one, the reverse osmosis membrane assembly two and the third reverse osmosis membrane assembly to serve as a backup for each other, reduce the concentration polarization problem of the membrane system, thereby reducing the use of cleaning agents while significantly reducing the risk of raw water scaling and improving the recovery rate. While the water production meets the index requirements, it can effectively extend the reverse osmosis chemical cleaning cycle, reduce the cost of chemical consumption, increase the water production rate and reduce the discharge of concentrated water, that is, improve the utilization rate of water resources and greatly reduce the disposal cost of reverse osmosis concentrated water. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of a reverse osmosis device in one embodiment of the present application.

[0018] Figure Numbers

[0019] 1-Liquid reservoir.

[0020] 2-flushing pipe, 20-liquid inlet pump, 21-first pipe section, 210-first valve, 211-second valve, 22-second pipe section, 220-fifth valve, 221-sixth valve, 23-third pipe section, 230-ninth valve, 231-tenth valve, 24-fourth pipe section, 240-third valve, 241-fourth valve, 25-fifth pipe section, 250-seventh valve, 251-eighth valve, 26-sixth pipe section, 260-eleventh valve, 261-twelfth valve, 27-thirteenth valve.

[0021] 3-Reverse osmosis membrane assembly one.

[0022] 4-Reverse osmosis membrane assembly two.

[0023] 5-Reverse osmosis membrane assembly three.

[0024] 6-cleaning pipe, 60-fourteenth valve.

[0025] 7-concentrated water pipe, 70-fifteenth valve.

[0026] 8-cleaner, 80-connecting pipe, 81-driving pump.

[0027] 9-Water production pipe. DETAILED DESCRIPTION

[0028] The specific implementation of the present utility model will be further described below with reference to the accompanying drawings.

[0029] It is easy to understand that according to the technical solution of the present invention, a variety of structural methods and implementation methods can be replaced by those skilled in the art without changing the essential spirit of the present invention. Therefore, the following specific embodiments and drawings are only illustrative of the technical solution of the present invention and should not be regarded as the entire present invention or as a limitation or restriction of the technical solution of the utility model.

[0030] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to the structure shown in the drawings. They are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0031] like Figure 1 As shown, the present application provides a reverse osmosis device, including a liquid reservoir 1, a flushing pipe 2 connected to the liquid reservoir 1, a reverse osmosis membrane assembly 1 3, a reverse osmosis membrane assembly 2 4 and a reverse osmosis membrane assembly 3 5.

[0032] Please refer to Figure 1 The liquid reservoir 1 is connected to a flushing pipe 2, and the flushing pipe 2 is connected to a liquid inlet pump 20. The flushing pipe 2 is connected to a first pipe section 21, a second pipe section 22, a third pipe section 23, a fourth pipe section 24, a fifth pipe section 25 and a sixth pipe section 26 arranged in parallel.

[0033] The reverse osmosis membrane assembly 3 includes a first water inlet and a second water inlet arranged opposite to each other, the first water inlet is connected between the first valve 210 and the second valve 211 of the first pipe section 21, and the second water inlet is connected between the third valve 240 and the fourth valve 241 of the fourth pipe section 24.

[0034] The reverse osmosis membrane assembly 2 4 includes a third water inlet and a fourth water inlet arranged opposite to each other, the third water inlet is connected between the fifth valve 220 and the sixth valve 221 of the second pipe section 22, and the fourth water inlet is connected between the seventh valve 250 and the eighth valve 251 of the fifth pipe section 25.

[0035] The reverse osmosis membrane assembly three 5 includes a fifth water inlet and a sixth water inlet arranged relatively to each other, the fifth water inlet is connected between the ninth valve 230 and the tenth valve 231 of the third pipe section 23, and the sixth water inlet is connected between the eleventh valve 260 and the twelfth valve 261 of the sixth pipe section 26.

[0036] The material of the reverse osmosis membrane in the reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4 and reverse osmosis membrane assembly 3 5 in the embodiments of the present application is preferably a polymer material such as cellulose acetate polymer, polyamide, polyester, polyimide and vinyl polymer. The structure of the membrane can be an asymmetric structure having a micro-dense layer provided on at least one side and micropores whose pore size gradually increases from the micro-dense layer to the inside of the membrane or other sides, or it can be a composite membrane structure having a separation functional layer formed by another material and formed on the micro-dense layer of the asymmetric membrane. The thickness of the membrane is preferably 10 μm-1 mm. As representative reverse osmosis membranes, known are cellulose acetate or polyamide asymmetric membranes, composite membranes with polyamide or polyurea separation functional layers, and the like. The reverse osmosis membrane or reverse osmosis membrane assembly made of the above-mentioned reverse osmosis membrane material is installed in the housing of the reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4 and reverse osmosis membrane assembly 3 5 by a bracket.

[0037] In the embodiment of the present application, not only can the operation of reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4 → reverse osmosis membrane assembly 3 5 be realized by opening and closing the valve, but also the operation mode of reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 1 3 can be dynamically switched. When the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4 → the reverse osmosis membrane assembly 3 5 are in operation, the first valve 210, the fifth valve 220, the third valve 240, the seventh valve 250, the eleventh valve 260, and the tenth valve 231 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 2 4 are in operation, the first valve 210, the ninth valve 230, the third valve 240, the seventh valve 250, the eleventh valve 260, and the sixth valve 221 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 2 4, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 1 3 are in operation, the fifth valve 220, the ninth valve 230, the third valve 240, the seventh valve 250, the eleventh valve 260, and the second valve 211 are opened, and the remaining valves are closed.

[0038] The operation modes of the above reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4 → reverse osmosis membrane assembly 3 5, reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 1 3 are all Figure 1 The left side of the water inlet is shown. It can also include Figure 1As shown in the right side water inlet mode, after switching to the right side water inlet mode, when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4 → the reverse osmosis membrane assembly 3 5 are in operation, the thirteenth valve 27, the fourth valve 241, the eighth valve 251, the second valve 211, the sixth valve 221, the tenth valve 231, and the eleventh valve 260 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 2 4 are in operation, the thirteenth valve 27, the fourth valve 241, the twelfth valve 261, the second valve 211, the sixth valve 221, the tenth valve 231, and the seventh valve 250 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 2 4, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 1 3, the thirteenth valve 27, the eighth valve 251, the twelfth valve 261, the second valve 211, the sixth valve 221, the tenth valve 231, and the third valve 240 are opened, and the remaining valves are closed.

[0039] The reverse osmosis device provided by the present application comprises a first pipe section 21, a second pipe section 22, a third pipe section 23, a fourth pipe section 24, a fifth pipe section 25 and a sixth pipe section 26 arranged in parallel on the flushing pipe 2, a first valve 210 and a second valve 211 located on the first pipe section 21, a third valve 240 and a fourth valve 241 located on the fourth pipe section 24, a fifth valve 220 and a sixth valve 221 located on the second pipe section 22, a seventh valve 250 and an eighth valve 251 located on the fifth pipe section 25, and ... The ninth and tenth valves 230 and 231 of pipe section 23, as well as the eleventh and twelfth valves 260 and 261 located in the sixth pipe section 26, dynamically adjust the orientation and position of the reverse osmosis primary and secondary sections of reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4, and reverse osmosis membrane assembly 3 5. This allows reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4, and reverse osmosis membrane assembly 3 5 to serve as backup for each other, reducing concentration polarization in the membrane system. This reduces the use of cleaning agents, significantly reduces the risk of raw water scaling, and improves recovery rates. While meeting water production requirements, this effectively extends the reverse osmosis chemical cleaning cycle, reduces chemical consumption costs, increases water production rates, and reduces brine discharge, thereby improving water resource utilization and significantly reducing the disposal costs of reverse osmosis brine.

[0040] As an optional embodiment, the first pipe segment 21, the second pipe segment 22, and the third pipe segment 23 are divided into a first group of pipe segments, and the fourth pipe segment 24, the fifth pipe segment 25, and the sixth pipe segment 26 are divided into a second group of pipe segments. A thirteenth valve 27 is provided on the flushing pipe 2 in the portion between the first and second groups of pipe segments. In the above-described operating mode, the thirteenth valve 27 is closed. The thirteenth valve 27 can be adjusted according to actual operating conditions to optimize the switching between water inlet and concentrate water. When the system is just put into operation, the thirteenth valve 27 is in a closed state, and the above-mentioned reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4 → reverse osmosis membrane assembly 3 5, reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 1 3 are all operated in the left side water inlet mode. When the above-mentioned operating mode is completed, the right side water inlet mode is switched, and the thirteenth valve 27 is in an open state. The same operation is carried out in sequence: reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 2 4 → reverse osmosis membrane assembly 3 5, reverse osmosis membrane assembly 1 3, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 2 4, reverse osmosis membrane assembly 3 5 → reverse osmosis membrane assembly 1 3.

[0041] As an optional embodiment, the reverse osmosis device further includes a cleaning pipe 6, and the fourth pipe section 24, the fifth pipe section 25 and the sixth pipe section 26 are all connected in parallel to the cleaning pipe 6. Figure 1 As shown, the cleaning pipe 6 collects the cleaning water on the right side and processes it uniformly.

[0042] As an optional embodiment, the reverse osmosis device further includes a concentrated water pipe 7, the first pipe section 21, the second pipe section 22 and the third pipe section 23 are connected in parallel to the concentrated water pipe 7, and the cleaning pipe 6 is connected to the concentrated water pipe 7. Figure 1 As shown, the concentrated water pipe 7 collects the concentrated water on the left side and processes it in a unified manner, wherein the cleaning pipe 6 is connected to the concentrated water pipe 7, so that the water in the cleaning pipe 6 and the concentrated water pipe 7 can be centrally processed.

[0043] As an optional embodiment, a fifteenth valve 70 is provided on the concentrated water pipe 7. The fifteenth valve 70 serves as a valve of the concentrated water main pipe and is a regulating valve for regulating the amount of concentrated water. In a specific embodiment, when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4 → the reverse osmosis membrane assembly 3 5 is in operation, the first valve 210, the fifth valve 220, the third valve 240, the seventh valve 250, the eleventh valve 260, the tenth valve 231, and the fifteenth valve 70 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 2 4 is in operation, the first valve 210, the ninth valve 230, the third valve 240, the seventh valve 250, the eleventh valve 260, the sixth valve 221, and the fifteenth valve 70 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 2 4, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 1 3 is in operation, the fifth valve 220, the ninth valve 230, the third valve 240, the seventh valve 250, the eleventh valve 260, the second valve 211, and the fifteenth valve 70 are opened, and the remaining valves are closed, and the concentrated water enters the concentrated water collection and treatment device through the fifteenth valve 70.

[0044] As an optional embodiment, a fourteenth valve 60 is provided on the cleaning pipe 6. The fourteenth valve 60 in the embodiment of the present application controls the opening and closing of the cleaning pipe 6. In a specific embodiment, when the outer right water inlet mode is switched, when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4 → the reverse osmosis membrane assembly 3 5 are in operation, the thirteenth valve 27, the fourth valve 241, the eighth valve 251, the second valve 211, the sixth valve 221, the tenth valve 231, the eleventh valve 260, the fourteenth valve 60, and the fifteenth valve 70 are opened, and the remaining valves are closed; when the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 3 5 → the reverse osmosis membrane assembly 2 4 are in operation, the thirteenth valve 27, the fourth valve 241, the twelfth valve 261, the second valve 21 1. The sixth valve 221, the tenth valve 231, the seventh valve 250, the fourteenth valve 60, and the fifteenth valve 70 are open, and the remaining valves are closed. When reverse osmosis membrane assembly 2 (4), reverse osmosis membrane assembly 3 (5) → reverse osmosis membrane assembly 1 (3) are in operation, the thirteenth valve 27, the eighth valve 251, the twelfth valve 261, the second valve 211, the sixth valve 221, the tenth valve 231, the third valve 240, the fourteenth valve 60, and the fifteenth valve 70 are open, and the remaining valves are closed. Concentrate passes through the fourteenth valve 60 and the fifteenth valve 70 and enters the concentrate collection and treatment device.

[0045] As an optional embodiment, the reverse osmosis device further includes a washer 8, wherein the washer 8 stores a cleaning fluid. The washer 8 is connected to the flushing pipe 2 via a connecting pipe 80, and a drive pump 81 is provided on the connecting pipe 80. The cleaning fluid in the embodiment of the present application can be an existing agent for cleaning reverse osmosis membranes. When the drive pump 81 is turned on, the cleaning fluid is driven into the flushing pipe 2 through the connecting pipe 80 to flush the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4, and the reverse osmosis membrane assembly 3 5.

[0046] As an optional embodiment, the cleaning pipe 6 is connected to the cleaning device 8. A sixteenth valve is installed on the cleaning pipe 6 and the cleaning device 8. When the system performs chemical cleaning, the fourteenth valve 60 and the sixteenth valve are opened.

[0047] As an optional embodiment, the reverse osmosis device further includes a water production pipe 9, to which the outlets of the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4, and the reverse osmosis membrane assembly 3 5 are connected in parallel. Water filtered by the reverse osmosis membrane assembly 1 3, the reverse osmosis membrane assembly 2 4, and the reverse osmosis membrane assembly 3 5 is discharged to the water production pipe 9 and exhausted therethrough.

[0048] As an optional embodiment, the water production pipe 9 is connected to the cleaning device 8. A seventeenth valve can be provided on the connecting pipe 80 between the water production pipe 9 and the cleaning device 8. Part of the water in the water production pipe 9 can be used as a replenishing liquid for the cleaning liquid. In this case, the seventeenth valve can be opened.

[0049] The design processing capacity of the existing two-stage system is 200M 3 / H, the ratio of the first and second membranes is 2:1 (reverse osmosis membrane component 1 3, reverse osmosis membrane component 2 4 → reverse osmosis membrane component 3 5), the recovery rate of the first stage is 50%, the recovery rate of the second stage is 50%, and the overall recovery rate is 75%. After the improvement according to this method, the guaranteed recovery rate of the membrane is 85%, that is, the water production is 200*85%=170M 3 / H, reverse osmosis water pressure is 1.0MPa reverse osmosis membrane module -3, water permeability is 3%, the initial pressure difference of the membrane system is 0.15MP reverse osmosis membrane module -3. The switching situation is as follows:

[0050] When the existing membrane system operation mode (reverse osmosis membrane module 1 3, reverse osmosis membrane module 2 4 → reverse osmosis membrane module 3 5) the processing capacity is ≤ 144.5M 3 / H or the reverse osmosis water supply pressure ≥1.15MPa reverse osmosis membrane component one 3 or the water desalination rate is 3.45% or the membrane system operating pressure difference is 0.225MPa reverse osmosis membrane component one 3, switch the system to reverse osmosis membrane component one 3, reverse osmosis membrane component three 5→reverse osmosis membrane component two 4 operation mode.

[0051] When the existing membrane system operation mode (reverse osmosis membrane module 1 3, reverse osmosis membrane module 3 5 → reverse osmosis membrane module 2 4) the processing capacity is ≤ 144.5M 3 / H or the reverse osmosis water supply pressure ≥1.15MP reverse osmosis membrane component one 3 or the water desalination rate is 3.45% or the membrane system operating pressure difference is 0.225MPa reverse osmosis membrane component one 3, the system will be switched to (reverse osmosis membrane component two 4, reverse osmosis membrane component three 5→reverse osmosis membrane component one 3) operation mode.

[0052] When the existing membrane system operation mode (reverse osmosis membrane module 2 4, reverse osmosis membrane module 3 5 → reverse osmosis membrane module 1 3) the processing capacity is ≤144.5M 3 / H or the reverse osmosis water pressure is ≥1.15MPa reverse osmosis membrane component one 3 or the water desalination rate is 3.45% or the membrane system operating pressure difference is 0.225MPa reverse osmosis membrane component one 3, the system will be switched to (reverse osmosis membrane component one 3, reverse osmosis membrane component two 4 → reverse osmosis membrane component three 5) operation mode.

[0053] When the system switching time is ≤ 2 hours, it means that the system is seriously polluted and chemical cleaning should be performed. After the chemical cleaning is completed, the above operation mode can be restored.

[0054] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0055] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the scope of protection of the present invention.

Claims

1. A reverse osmosis device, characterized in that: include: A liquid reservoir, the liquid reservoir being connected to a flushing pipe, the flushing pipe being connected to a liquid inlet pump; the flushing pipe being further connected to a first pipe segment, a second pipe segment, a third pipe segment, a fourth pipe segment, a fifth pipe segment, and a sixth pipe segment arranged in parallel; A reverse osmosis membrane assembly 1, comprising a first water inlet and a second water inlet arranged opposite to each other, the first water inlet being connected between the first valve and the second valve of the first pipe section, and the second water inlet being connected between the third valve and the fourth valve of the fourth pipe section; a second reverse osmosis membrane assembly, the second reverse osmosis membrane assembly comprising a third water inlet and a fourth water inlet arranged opposite to each other, the third water inlet being connected between the fifth valve and the sixth valve of the second pipe section, and the fourth water inlet being connected between the seventh valve and the eighth valve of the fifth pipe section; Reverse osmosis membrane assembly three, the reverse osmosis membrane assembly three includes a fifth water inlet and a sixth water inlet arranged relatively to each other, the fifth water inlet is connected between the ninth valve and the tenth valve of the third pipe section, and the sixth water inlet is connected between the eleventh valve and the twelfth valve of the sixth pipe section.

2. The reverse osmosis device according to claim 1, characterized in that The first pipe segment, the second pipe segment and the third pipe segment are divided into a first group of pipe segments, the fourth pipe segment, the fifth pipe segment and the sixth pipe segment are divided into a second group of pipe segments, and a thirteenth valve is provided on the portion of the flushing pipe located between the first group of pipe segments and the second group of pipe segments.

3. The reverse osmosis device according to claim 2, characterized in that The reverse osmosis device further includes a cleaning pipe, and the fourth pipe section, the fifth pipe section, and the sixth pipe section are all connected in parallel to the cleaning pipe.

4. The reverse osmosis device according to claim 3, characterized in that The reverse osmosis device further includes a concentrated water pipe, the first pipe section, the second pipe section, and the third pipe section are connected in parallel to the concentrated water pipe, and the cleaning pipe is connected to the concentrated water pipe.

5. The reverse osmosis device according to claim 4, characterized in that A fifteenth valve is provided on the concentrated water pipe.

6. The reverse osmosis device according to claim 5, characterized in that The cleaning pipe is provided with a fourteenth valve.

7. The reverse osmosis device according to claim 5, characterized in that The reverse osmosis device further comprises a washer, in which a cleaning liquid is stored. The washer is connected to the flushing pipe via a connecting pipe, and a driving pump is provided on the connecting pipe.

8. The reverse osmosis device according to claim 7, characterized in that The cleaning pipe is connected to the cleaning device.

9. The reverse osmosis device according to claim 7, characterized in that: The reverse osmosis device further includes a water production pipe, and the reverse osmosis membrane assembly 1, the reverse osmosis membrane assembly 2, and the reverse osmosis membrane assembly 3 are all connected in parallel to the water production pipe.

10. The reverse osmosis device according to claim 9, characterized in that: The water production pipe is connected to the cleaning device.

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