Reverse osmosis device capable of switching multiple paths

Abstract

The utility model discloses a reverse osmosis device capable of switching multiple paths. The reverse osmosis device comprises a reverse osmosis water supply system, a reverse osmosis membrane stack, a reverse osmosis concentrated water side pipeline and a reverse osmosis water production side pipeline, the reverse osmosis concentrated water side pipeline comprises a concentrated water discharge pipe and a concentrated water return pipe, and the reverse osmosis produced water side pipeline comprises a produced water discharge pipe and a produced water return pipe; a concentrated water three-way valve and a produced water three-way valve are respectively arranged on the reverse osmosis concentrated water side pipeline and the reverse osmosis produced water side pipeline, and the communication states of the concentrated water three-way valve and the concentrated water discharge pipe and the concentrated water return pipe and the communication states of the produced water three-way valve and the produced water discharge pipe and the produced water return pipe are automatically switched; no matter the reverse osmosis device is in an operation, shutdown or cleaning state, one of the reverse osmosis concentrated water side pipeline and the reverse osmosis water production side pipeline is always communicated with the reverse osmosis water supply system, the requirement for opening and closing a valve of the reverse osmosis water production / concentrated water side pipeline is met, the valve normally-open action does not need to be designed in a control program, and the control cost is reduced. And the program fault risk and the system operation risk are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reverse osmosis, in particular to a multi-path switchable reverse osmosis device. Background Art

[0002] Reverse osmosis, also known as reverse osmosis, is a membrane separation process that uses pressure differentials to separate solvents from solutions. Pressure is applied to the liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent reverses its natural osmotic flow, resulting in the permeate (permeate) on the low-pressure side of the membrane and the concentrated concentrate (concentrate) on the high-pressure side. With the continuous development of industry and increasing environmental protection requirements, reverse osmosis systems have found increasing applications in industries such as food, medicine, petrochemicals, salt separation, reclaimed water reuse, and high-salt water treatment.

[0003] See Figure 1 In a conventional reverse osmosis system, two pipelines are required on both the low-pressure side (also known as the permeate side) and the high-pressure side (also known as the brine side) of the membrane. The low-pressure side piping is divided into a product water discharge line and a product water return line. The product water discharge line is connected to the product water tank, and the product water return line is connected to the cleaning water tank. The high-pressure side piping is divided into a brine discharge line and a brine return line. The brine discharge line is connected to the brine tank, and the brine return line is connected to the cleaning water tank. To ensure automated system operation, all four lines require automatic valves. Furthermore, due to the structural characteristics of the reverse osmosis membrane (i.e., its inability to withstand pressure buildup) and system safety considerations, a clear line must be maintained on both the low-pressure and high-pressure sides of the reverse osmosis system. This requires strict control of the opening and closing of the product water / brine valves in the system control program design. This control program is relatively complex. If a program error or manual error causes the product water / brine pipeline to be under pressure, it may damage the membrane elements and even cause system safety issues. Summary of the Invention

[0004] Aiming at the problems that the existing reverse osmosis system has too many automatic valves in the water production / concentrated water pipelines and the control procedures are complicated, the utility model provides a reverse osmosis device with multi-channel switching.

[0005] The technical solution adopted in this utility model is:

[0006] A multi-way switchable reverse osmosis device comprises a reverse osmosis water supply system, a reverse osmosis membrane stack, a reverse osmosis concentrate side pipeline and a reverse osmosis produced water side pipeline; the reverse osmosis concentrate side pipeline comprises a concentrate discharge pipe and a concentrate return pipe, and the reverse osmosis produced water side pipeline comprises a produced water discharge pipe and a produced water return pipe; a concentrate three-way valve and a produced water three-way valve are respectively provided on the reverse osmosis concentrate side pipeline and the reverse osmosis produced water side pipeline, and the connected state of the concentrate three-way valve with the concentrate discharge pipe and the concentrate return pipe, and the connected state of the produced water three-way valve with the produced water discharge pipe and the produced water return pipe is automatically switched, so that no matter whether the reverse osmosis device is in operation, shutdown or cleaning state, one of the reverse osmosis concentrate side pipeline and the reverse osmosis produced water side pipeline is always connected to the reverse osmosis water supply system.

[0007] Furthermore, the reverse osmosis water supply system includes a reverse osmosis water supply pump, a water supply filter and a reverse osmosis high-pressure pump which are sequentially connected through a water supply pipeline.

[0008] Furthermore, the reverse osmosis concentrate side pipeline also includes a concentrate main pipe, one end of which is connected to the concentrate outlet of the reverse osmosis membrane stack, and the other end is connected to the concentrate discharge pipe and the concentrate return pipe respectively through the concentrate three-way valve.

[0009] Furthermore, a concentrate regulating valve is provided on the concentrate main pipe for regulating the concentrate flow rate.

[0010] Furthermore, the reverse osmosis water production side pipeline also includes a water production main pipe, one end of which is connected to the water production outlet of the reverse osmosis membrane stack, and the other end is connected to the water production discharge pipe and the water production return pipe respectively through the water production three-way valve.

[0011] Furthermore, a water production one-way valve is provided on the water production main pipe.

[0012] Beneficial effects of the utility model:

[0013] 1. Introduce multi-way valves into the reverse osmosis system design and use automatic three-way valves to replace traditional automatic valves, saving control points, reducing the number of automatic valves in the system and reducing system costs.

[0014] 2. Due to the structural characteristics of the three-way valve, at least one of the product water / concentrate outlet pipelines is always in a unobstructed state, meeting the opening and closing requirements of the reverse osmosis product water / concentrate side pipeline valves. There is no need to design the valve normally open action in the control program, reducing the risk of program failure and system operation risk.

[0015] 3. As a mature product, the automatic three-way valve has dimensions, specifications and pressure ratings that can meet the design requirements of common reverse osmosis systems and is suitable for most reverse osmosis systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of an existing reverse osmosis system.

[0017] Figure 2 This is a flow chart of the reverse osmosis device of the present utility model.

[0018] Figure 3 The utility model is a schematic diagram of the three-way valve operation of the reverse osmosis device in the shutdown and cleaning states.

[0019] Figure 4 It is a working schematic diagram of the three-way valve of the reverse osmosis device of the present invention in the operating state.

[0020] The following are the descriptions of the reference numerals:

[0021] 1a reverse osmosis water feed pump, 1b water feed filter, 1c reverse osmosis high-pressure pump, 2 reverse osmosis membrane stack, 3a brine regulating valve, 3b brine three-way valve, 3c brine discharge pipeline, 3d brine return pipeline, 4a produced water one-way valve, 4b produced water three-way valve, 4c produced water discharge pipeline, 4d produced water return pipeline. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and a preferred embodiment.

[0023] See Figures 1-4 A multi-channel switchable reverse osmosis device includes: a reverse osmosis water supply system, a reverse osmosis membrane stack 2, a reverse osmosis concentrated water side pipeline and a reverse osmosis water production side pipeline.

[0024] The reverse osmosis water supply system consists of a reverse osmosis water supply pump 1a, a water supply filter 1b, and a reverse osmosis high-pressure pump 1c, connected in sequence via a water supply pipe. Water enters the system through reverse osmosis water supply pump 1a, passes through water supply filter 1b to remove large particles of impurities, and then enters reverse osmosis high-pressure pump 1c. After being pressurized by reverse osmosis high-pressure pump 1c to reach the designed membrane inlet pressure, the water enters reverse osmosis membrane stack 2.

[0025] The reverse osmosis membrane stack 2 comprises several reverse osmosis membrane elements and a pressure vessel for housing them. The pressure vessel is equipped with a membrane water inlet, a membrane water outlet, and a membrane concentrate outlet. The membrane water inlet is connected to the water supply pipe, the membrane water outlet is connected to the reverse osmosis production water pipeline, and the membrane concentrate outlet is connected to the reverse osmosis concentrate side pipeline. Incoming water is pressurized by a reverse osmosis high-pressure pump 1c and enters the reverse osmosis membrane stack 2. The concentrate enters the reverse osmosis concentrate side pipeline, and the permeate enters the reverse osmosis production water pipeline.

[0026] The reverse osmosis concentrate pipeline includes a concentrate main pipe, a concentrate regulating valve 3a, a concentrate three-way valve 3b, a concentrate discharge pipe 3c, and a concentrate return pipe 3d. The concentrate regulating valve 3a is located on the concentrate main pipe, while the concentrate three-way valve 3b is located at the end of the concentrate main pipe. One end of the concentrate discharge pipe 3c is connected to the first outlet of the concentrate three-way valve 3b and the other end is connected to the concentrate tank. The concentrate return pipe 3d is connected to the second outlet of the concentrate three-way valve 3b and the other end is connected to the rinse water tank. Both the concentrate regulating valve 3a and the concentrate three-way valve 3b are automatic valves.

[0027] The concentrate concentrated by the reverse osmosis membrane stack is regulated and depressurized by the concentrate regulating valve 3a and then enters the concentrate three-way valve 3b. The two outlets of the concentrate three-way valve 3b are respectively connected to the concentrate discharge pipe 3c and the concentrate return pipe 3d. In the shutdown and cleaning states, the first outlet of the concentrate three-way valve 3b is closed, and the second outlet is opened to connect to the concentrate return pipe 3d. In the water production state, the second outlet of the concentrate three-way valve 3b is closed, and the first outlet is opened to connect to the concentrate discharge pipe 3c.

[0028] The reverse osmosis water production piping includes a water main, a water check valve 4a, a water three-way valve 4b, a water discharge pipe 4c, and a water return pipe 4d. The water check valve 4a is installed on the water main, while the water three-way valve 4b is located at the end of the water main. The water discharge pipe 4c is connected to the first inlet of the water three-way valve 4b at one end and to the water tank at the other end. The water return pipe 4d is connected to the second inlet of the water three-way valve 4b at one end and to the rinse water tank at the other end. Both the water check valve 4a and the water three-way valve 4b are automatic valves.

[0029] After filtering through the reverse osmosis membrane stack, the permeate flows through the water production check valve 4a and into the water production three-way valve 4b. The two outlets of the water production three-way valve 4b are connected to the water production discharge pipe 4c and the water production return pipe 4d, respectively. During shutdown and cleaning, the first outlet of the water production three-way valve 4b is closed, while the second inlet is open and connected to the water production return pipe 4d. During water production, the second inlet of the water production three-way valve 4b is closed, while the first inlet is open and connected to the water production discharge pipe 4c.

[0030] The working principle of this utility model is:

[0031] See Figure 4 When the reverse osmosis is in shutdown state, the reverse osmosis water pump 1a and the reverse osmosis high-pressure pump 1c are in stopped state, the produced water three-way valve 4b is connected to the produced water return pipe 4d, and the residual permeate in the produced water main pipe is discharged to the cleaning water tank through the produced water return pipe 4d; the concentrated water three-way valve 3b is connected to the concentrated water return pipe 3d, and the concentrated water remaining in the concentrated water main pipe is discharged to the cleaning water tank through the concentrated water return pipe 3d. The system is in standby state.

[0032] See Figure 3After receiving the "run" command, the system switches the water production three-way valve 4b to connect it to the water production discharge pipe 4c, switches the concentrated water three-way valve 3b to connect it to the concentrated water discharge pipe 3c, and then starts the reverse osmosis water pump 1a and the reverse osmosis high-pressure pump 1c in sequence, and the system enters the running state.

[0033] See Figure 4 After the system receives the "cleaning" command, it first restores the valve and water pump status to the shutdown state, switches the water production three-way valve 4b to connect it to the water production return pipe 4d, switches the concentrated water three-way valve 3b to connect it to the concentrated water return pipe 3d, and then starts the reverse osmosis water pump 1a to perform system circulation cleaning.

[0034] This application realizes automatic switching of the internal pipelines of the concentrate / product water side by setting automatic multi-way valves on the reverse osmosis concentrate water side pipeline and the reverse osmosis product water side pipeline, while ensuring that there is always one internal pipeline on the concentrate / product water side in an unobstructed state.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A multi-channel switchable reverse osmosis device, comprising a reverse osmosis water supply system, a reverse osmosis membrane stack (2), a reverse osmosis concentrated water side pipeline and a reverse osmosis produced water side pipeline; the reverse osmosis concentrated water side pipeline comprises a concentrated water discharge pipe (3c) and a concentrated water return pipe (3d), and the reverse osmosis produced water side pipeline comprises a produced water discharge pipe (4c) and a produced water return pipe (4d), characterized in that: A concentrated water three-way valve (3b) and a produced water three-way valve (4b) are respectively provided on the reverse osmosis concentrated water side pipeline and the reverse osmosis produced water side pipeline. By automatically switching the connection state between the concentrated water three-way valve (3b) and the concentrated water discharge pipe (3c) and the concentrated water return pipe (3d), and the connection state between the produced water three-way valve (4b) and the produced water discharge pipe (4c) and the produced water return pipe (4d), one of the reverse osmosis concentrated water side pipeline and the reverse osmosis produced water side pipeline is always connected to the reverse osmosis water supply system regardless of whether the reverse osmosis device is in operation, shutdown or cleaning state.

2. A multi-channel switchable reverse osmosis device according to claim 1, characterized in that: The reverse osmosis water supply system comprises a reverse osmosis water supply pump (1a), a water supply filter (1b) and a reverse osmosis high-pressure pump (1c) which are connected in sequence through a water supply pipeline.

3. A multi-channel switchable reverse osmosis device according to claim 1, characterized in that: The reverse osmosis concentrated water side pipeline also includes a concentrated water main pipe, one end of which is connected to the concentrated water outlet of the reverse osmosis membrane stack (2), and the other end is connected to the concentrated water discharge pipe (3c) and the concentrated water return pipe (3d) respectively through the concentrated water three-way valve (3b).

4. A multi-channel switchable reverse osmosis device according to claim 3, characterized in that: A concentrated water regulating valve (3a) is provided on the concentrated water main pipe for regulating the concentrated water flow rate.

5. A multi-channel switchable reverse osmosis device according to claim 1, characterized in that: The reverse osmosis water production side pipeline also includes a water production main pipe, one end of which is connected to the water production outlet of the reverse osmosis membrane stack (2), and the other end of which is connected to the water production discharge pipe (4c) and the water production return pipe (4d) respectively through the water production three-way valve (4b).

6. A multi-channel switchable reverse osmosis device according to claim 5, characterized in that: A water production check valve (4a) is provided on the water production main pipe.

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