Automatic flushing type reverse osmosis filtering device

Abstract

The invention discloses an automatic flushing type reverse osmosis filtering device which comprises a filtering device and pipelines connected with the filtering device, the filtering device comprises a shell and a membrane assembly, and the pipelines comprise a pipeline I, a pipeline II, a pipeline III, a pipeline IV and a pipeline V; the membrane assembly is mounted in the shell and comprises a central pipe and a reverse osmosis membrane element, the reverse osmosis membrane element is wound on the periphery of the central pipe, the central pipe is provided with a central pipe I and a central pipe II which are mutually independent, the reverse osmosis membrane element consists of an outer membrane bag and an inner membrane bag, and the inner membrane bag is positioned in the outer membrane bag; the reverse osmosis membrane element disclosed by the invention is provided with the two flow channels for filtering and the common flow channel for collecting the pure solution, and the on-off control of a plurality of pipelines is adopted, so that the continuous filtering of one filtering flow channel of the device can be realized, and meanwhile, the other filtering flow channel can be automatically flushed without interruption; the service life of the reverse osmosis membrane is greatly prolonged, the resource recycling of the pure solution is realized, the washing cost is reduced, and the operation mode is flexible and diversified.

Description

Technical Field

[0001] The invention belongs to the technical field of membrane filtration separation devices, and in particular relates to an automatic flushing reverse osmosis filtration device. Background Art

[0002] With the development of reverse osmosis membrane filtration and separation technology, reverse osmosis membranes have been applied to various fields such as water purification, chemistry, biology, and pharmaceuticals. As we all know, reverse osmosis membrane filtration is selective and directional. A filtration layer is provided on one side of the membrane. The original solution flows through the membrane surface and performs reverse osmosis under the action of pressure. The solvent enters the other side of the membrane, while the solute is intercepted to form a concentrated solution. However, with long-term filtration, the solute in the solution will be deposited on the surface of the membrane filtration layer, causing the filtration efficiency of the membrane to gradually decrease until it is blocked. Therefore, it usually stops working after a period of filtration, and then the pressure in the filtration channel is not held down, so that The flow rate of the solution is accelerated, so that the membrane is cleaned for a short period of time; in the filtration separation of different industries or products, some need to separate solvents, while others need solutes; in the prior art, in the concentration and separation of chemical reagents, it goes without saying that the concentrated solution needs to be retained, and the pure solution filtered out will usually be discharged. At the same time, in order to prevent the reverse osmosis membrane from being blocked too quickly, the usual practice is to stop the filtration work and perform a short period of rapid flushing by the above method; however, according to the characteristics of high-precision filtration of the reverse osmosis membrane, the pure solution obtained by filtration has a high purity and can be used to flush the membrane; Therefore, the above-mentioned existing technologies for concentration and separation have the following problems: (1) the filtered solution with higher purity is directly discharged without being utilized, resulting in a waste of resources; (2) the filtration cannot be continuously operated for a long time and needs to be stopped before the flushing process can be carried out, and the effect of flushing only by speeding up the water flow for a short period of time is poor; (3) when selecting the flushing liquid, the cost of special flushing liquid is high, and the use of general purity water for cleaning may cause other pollution to the flow channel. Summary of the invention

[0003] In view of the above technical problems existing in the prior art, an embodiment of the present invention provides an automatic flushing reverse osmosis filtration device.

[0004] In order to solve the above technical problems, the technical solution adopted in the embodiments of the present invention is: A kind of automatic flushing reverse osmosis filtration device, including a filtration device and a pipeline connected thereto, the filtration device including: a shell membrane assembly, installed in a shell, including a central tube and a reverse osmosis membrane element, the reverse osmosis membrane element is wound around the outer circumference of the central tube, the central tube has a central tube 1 and a central tube 2 which are independent of each other, and the central tube 1 and the central tube 2 are both open at one end and closed at the other end; the reverse osmosis membrane element is composed of an outer membrane bag and an inner membrane bag, the inner membrane bag is located inside the outer membrane bag, the outer membrane bag is composed of a membrane sheet 1 and a membrane sheet 2 arranged with their front faces facing each other, and the inner membrane bag is composed of a membrane sheet 3 and a membrane sheet 4 arranged with their front faces facing each other; a first flow channel is formed inside the inner membrane bag and is connected to the central tube 1, the side opening of the inner membrane bag away from the central tube is arranged to be connected to the outside of the reverse osmosis membrane element and the other sides are sealed, the outer membrane bag is provided with a first flow channel, and the inner membrane bag is provided with a first flow channel, and the first flow channel is connected to the central tube 1, and the side opening of the inner membrane bag away from the central tube is arranged to be connected to the outside of the reverse osmosis membrane element and the other sides are sealed, The membrane bag is sealed all around, and a second flow channel is formed inside it and is connected to the central tube 2; after the membrane element is spirally wound around the outer circumference of the central tube, an annular gap is formed between the outer surfaces of the outer membrane bag along the length direction of the central tube to constitute the third flow channel, and a sealing adhesive is set at the gap port located at the outermost circumference; a sealing sleeve is provided on the outermost surface of the reverse osmosis membrane element, and the sealing sleeve does not block the side opening of the inner membrane bag; the pipeline includes: pipeline one, which is used to connect to the central tube 1 and can be selectively opened and closed; pipeline two, which is used to connect to the side opening of the inner membrane bag away from the central tube and can be selectively opened and closed; pipeline three and pipeline four, which are used to connect to the two ports of the third flow channel respectively and can be selectively opened and closed; pipeline five, which is used to connect the central tube 2 with the central tube 1 and any port of the third flow channel respectively and can be selectively opened and closed.

[0005] Preferably, the upper and lower sides of the outer film bag and the inner film bag are sealed and bonded as a whole, the sides of the outer film bag and the inner film bag close to the central tube are sealed and bonded separately, and the side of the inner film bag close to the central tube is shrunk inside the outer film bag, and the inner film bag is opened on one side away from the central tube, and the side of the outer film bag film sheet 1 away from the central tube and the side of the inner film bag film sheet 3 away from the central tube are sealed by adhesive, and the side of the outer film bag film sheet 2 away from the central tube and the side of the inner film bag film sheet 4 away from the central tube are sealed by adhesive.

[0006] Preferably, the shell is provided with water inlet 1, water inlet 2, water inlet 3, water inlet 4 and water inlet 5, the water inlet 1 is independently connected to the central pipe 1, the water inlet 2 is independently connected to the gap between the membrane assembly and the shell, the water inlet 3 is independently connected to the upper end surface of the reverse osmosis membrane element, the water inlet 4 is independently connected to the lower end surface of the reverse osmosis membrane element, and the water inlet 5 is independently connected to the central pipe 2; the pipeline 1 is connected to the water inlet 1, the pipeline 2 is connected to the water inlet 2, the pipeline 3 and the pipeline 4 are respectively connected to the water inlet 3 and the water inlet 4, and the pipeline 5 is used to connect the water inlet 5 with the water inlet 1 and the water inlet 4 respectively.

[0007] Preferably, the pipeline one is connected in series with a water inlet solenoid valve one, the pipeline two is connected in series with a concentrated water solenoid valve two, the pipeline three is connected in series with a water inlet solenoid valve three, the pipeline four is connected in series with a concentrated water solenoid valve four, the branch of the pipeline five used to communicate with the water outlet one is connected in series with a water inlet solenoid valve five, and the branch of the pipeline five used to communicate with the water outlet four is connected in series with a water inlet solenoid valve six.

[0008] Preferably, the membrane assembly further comprises: a sleeve, which is sleeved on the outer circumference of the sealing sleeve and has a long strip of water on the side, and the upper and lower ends of the sleeve are sealed with glue to the sealing sleeve; an upper end cover and a lower end cover, which are respectively covered on the upper and lower ends of the reverse osmosis membrane element, and a seal is set between the side wall and the outer wall of the sleeve.

[0009] Preferably, the shell includes a filter cartridge and a filter cartridge cover, the filter cartridge cover is provided with two inner and outer circles of annular convex wall one and convex wall two, the bottom of the filter cartridge is provided with two inner and outer circles of annular convex wall three and convex wall four; the opening end of the center tube one is sealed and plugged with the annular convex wall one, and the upper end of the upper end cover is sealed and plugged with the annular convex wall two; the opening end of the center tube two is sealed and plugged with the annular convex wall three, and the upper end of the lower end cover is sealed and plugged with the annular convex wall four.

[0010] Preferably, the water inlet solenoid valve one, water inlet solenoid valve three and water inlet solenoid valve six are opened, the concentrated water solenoid valve two is half opened, the concentrated water solenoid valve four and water inlet solenoid valve five are closed, the original solution enters the first flow channel through pipeline one for filtration, the concentrated solution flows out through pipeline two, the pure solution enters the second flow channel through pipeline five and enters water outlet four, and is discharged from pipeline three after flushing the third flow channel.

[0011] Preferably, the water inlet solenoid valve 2 and the water inlet solenoid valve 5 are opened, the concentrated water solenoid valve 4 is half opened, the concentrated water solenoid valve 2 is fully opened, the water inlet solenoid valve 1 and the water inlet solenoid valve 6 are closed, the original solution enters the third flow channel through pipeline 2 for filtration, the concentrated solution flows out through pipeline 4, the pure solution enters the second flow channel and enters the water outlet 1 through pipeline 5, and is discharged from pipeline 2 after flushing the first flow channel.

[0012] Preferably, the central tube composed of the central tube one and the central tube two is cylindrical.

[0013] Preferably, the pipeline 5 is also provided with a branch independently connected to the outside for discharging pure solution, and the branch is provided with a water inlet solenoid valve 7.

[0014] Preferably, the reverse osmosis membrane element further comprises a grid-shaped flow channel network, and the flow channel network is fixedly sandwiched between any two adjacent membrane sheets.

[0015] Compared with the prior art, the automatic flushing reverse osmosis filtration device provided by the embodiment of the present invention has the following beneficial effects: (1) Through the unique design of the reverse osmosis membrane element, it is composed of an outer membrane bag and an inner membrane bag. The inner membrane bag is located inside the outer membrane bag. The outer membrane bag is composed of membrane sheets 1 and 2 arranged with their front faces facing each other, and the inner membrane bag is composed of membrane sheets 3 and 4 arranged with their front faces facing each other. In this way, after the membrane element is wound on the central tube, two flow channels for filtration (the first flow channel and the third flow channel) and a common flow channel for collecting pure solution (the second flow channel) are formed inside. In addition, the on-off control of multiple pipelines allows one of the flow channels to be used for filtration during concentration and separation, and the filtered pure solution can be directly discharged to the central tube. The first filter channel is connected to another filter channel for automatic and continuous solubility high-efficiency flushing; the two filter channels can be used alternately, so that the device can achieve continuous and uninterrupted filtering work while the other filter channel is also flushed automatically and uninterruptedly, which greatly improves the life of the reverse osmosis membrane and realizes the resource reuse of pure solution and reduces the flushing cost; (2) by adding an independent branch connected to the outside in pipeline five for discharging pure solution, when it is necessary to improve the filtering efficiency, the two filter channels can also be used at the same time, making the use of the device more flexible and diverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the automatic flushing reverse osmosis filtration device provided by the embodiment of the present invention is shown in FIG. Figure 1 . Figure 2 This is a structural exploded view of the filtering device provided in an embodiment of the present invention. Figure 3 A cross-sectional view of a filtering device provided in an embodiment of the present invention. Figure 4 A top view of a cross-sectional view of a membrane assembly provided in an embodiment of the present invention. Figure 5 The structure of the membrane assembly provided by the embodiment of the present invention Figure 1 (Reverse osmosis membrane element expanded state). Figure 6 A is a partial enlarged view of a reverse osmosis membrane element provided in an embodiment of the present invention. Figure 7 The structure of the membrane assembly provided by the embodiment of the present invention Figure 2 (Reverse osmosis membrane element rolled up). Figure 8 The structure of the automatic flushing reverse osmosis filtration device provided by the embodiment of the present invention is shown in FIG. Figure 2 (The first channel is in filtering state, the third channel is in flushing state). Fig. 9 The structure of the automatic flushing reverse osmosis filtration device provided by the embodiment of the present invention is shown in FIG. Figure 3 (The third channel is filtering, the first channel is flushing state). Fig.10 Schematic diagram of electrical connection of the automatic flushing reverse osmosis filtration device provided in an embodiment of the present invention Figure 1 . Fig.11 The structure of the automatic flushing reverse osmosis filtration device provided by the embodiment of the present invention is shown in FIG. Figure 4 (The first channel is filtering and the third channel is filtering at the same time). Fig.12 Schematic diagram of the electrical connection of the automatic flushing reverse osmosis filtration device provided in the embodiment of the present invention Figure 2 .

[0017] In the figure: 100-filter device; 101-membrane assembly; 102-housing; 201-inner membrane bag; 202-outer membrane bag; 1-central tube; 2-reverse osmosis membrane element; 3-sleeve; 4-upper end cover; 5-lower end cover; 6-filter cartridge cover; 7-filter cartridge; 8-electric control board; 9-sealing sleeve; 11-central tube 1; 12-central tube 2; 21-diaphragm 1; 22-diaphragm 2; 23-diaphragm 3; 24-diaphragm 4; 25-gap port; 26-flow channel network; 61-convex wall 1; 62-convex wall 2; 71-convex wall Wall three; 72-convex wall four; D1-water inlet solenoid valve one; D2-concentrated water solenoid valve two; D3-water inlet solenoid valve three; D4-concentrated water solenoid valve four; D5-water inlet solenoid valve five; D6-water inlet solenoid valve six; D7-water inlet solenoid valve seven; K1-water inlet one; K2-water inlet two; K3-water inlet three; K4-water inlet four; K5-water inlet five; L1-first flow channel; L2-second flow channel; L3-third flow channel; E1-pipeline one; E2-pipeline two; E3-pipeline three; E4-pipeline four; E5-pipeline five. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up” and “down” are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0020] like Figures 1 to 7As shown, an embodiment of the present invention discloses an automatic flushing reverse osmosis filtration device, including a filtration device 100 and a pipeline connected thereto, the filtration device 100 includes a shell 102 and a membrane assembly 101, the pipeline includes a pipeline 1 E1, a pipeline 2 E2, a pipeline 3 E3, a pipeline 4 E4 and a pipeline 5 E5; the membrane assembly 101 is installed in the shell 102, including a central tube 1 and a reverse osmosis membrane element 2, the reverse osmosis membrane element is wound around the outer periphery of the central tube 1, the central tube 1 has a central tube 11 and a central tube 2 12 that are independent of each other, and the central tube 1 11 and the central tube 2 12 are both open at one end and closed at the other end; the reverse osmosis membrane element 2 is composed of an outer membrane bag 202 and an inner membrane bag 201, the inner membrane bag 201 is located in the outer membrane bag 20 2, the outer membrane bag 202 is composed of a membrane sheet 1 21 and a membrane sheet 2 22 arranged in front of each other, the inner membrane bag 201 is composed of a membrane sheet 3 23 and a membrane sheet 4 24 arranged in front of each other, a first flow channel L1 is formed inside the inner membrane bag 201 and is connected to the central tube 1 11, the side opening of the inner membrane bag 201 away from the central tube 1 is arranged to be connected to the outside of the reverse osmosis membrane element 2 and the other sides are sealed, the outer membrane bag 202 is sealed all around, a second flow channel L2 is formed inside it and is connected to the central tube 2 12, after the membrane element is spirally wound around the outer periphery of the central tube 1, an annular gap is formed between the outer surfaces of the outer membrane bag 202 along the length direction of the central tube 1, forming a third flow channel L3, and the gap port 25 located at the outermost periphery is sealed with adhesive; The outermost surface of the reverse osmosis membrane element 2 is provided with a sealing sleeve 9, and the sealing sleeve 9 does not block the side opening of the inner membrane bag 201. The setting of the sealing sleeve 9 only needs to isolate the outer surface of the outermost side wall of the reverse osmosis membrane element 2 from the outside, and ensure that the side opening of the inner membrane bag 201, namely the first flow channel L1, can be connected to the outside of the membrane assembly 101. All those that meet the intention of the present invention belong to the protection scope of this application. The specific setting method of the sealing sleeve 9 of the present application is to wrap the sealing sleeve 9 from the glue position of the gap port 25 to the side of the outer membrane bag 202 located at the periphery, and the starting end and the end of the sealing sleeve 9 are both glue-sealed and fixed to the outer surface of the reverse osmosis membrane element 2; the first flow channel L1 and the third flow channel L3 A flow channel for filtration is formed, the original solution passes through the first flow channel L1 or the third flow channel L3, is filtered through the corresponding membrane, and the pure solution enters the second flow channel L2, and the second flow channel L2 is used to collect the pure solution separated by the first flow channel L1 and the third flow channel L3; the pipeline E1 is used to connect the central tube 11 and can be selectively opened and closed, the pipeline E2 is used to connect the side opening of the inner membrane bag 201 away from the central tube 1 and can be selectively opened and closed, the pipeline E3 and the pipeline E4 are used to respectively connect the two ports of the third flow channel L3 and can both be selectively opened and closed, and the pipeline E5 includes two branches, which are used to connect the central tube 2 12 with the central tube 11 and any port of the third flow channel L3, respectively, and the two branches can both be selectively opened and closed;In a preferred embodiment, in order to make the flow channel smoother, the reverse osmosis membrane element further includes a grid-shaped flow channel network 26, and the flow channel network 26 is fixedly clamped between any two adjacent membrane sheets. ;

[0021] In an optional embodiment, the specific edge sealing method of the outer film bag 202 and the inner film bag 201 is as follows: the outer walls of the central tube 11 and the central tube 2 12 are both provided with water holes. First, the central tube 1 11 is clamped between the diaphragm 3 23 and the diaphragm 4 24 of the inner film bag 201 in parallel with the side of the inner film bag 201, and then the central tube 2 12 and the central tube 1 11 are assembled into the central tube 1. Finally, the above-mentioned integral body with the inner film bag 201 is clamped in parallel between the diaphragm 1 21 and the diaphragm 2 22 of the outer film bag 202; the upper and lower sides of the outer film bag 202 and the inner film bag 201 are sealed and bonded as a whole, and the sides of the outer film bag 202 and the inner film bag 201 close to the central tube are independently sealed and bonded, and the side of the inner film bag 201 close to the central tube shrinks Inside the outer membrane bag 202, ensure that there is a gap between the two side edges of the inner membrane bag 201 and the outer membrane bag 202 close to the central tube, so that an integrally connected second flow channel L2 is formed inside the outer membrane bag 202; the inner membrane bag 201 is opened on one side away from the central tube 1, and the side of the membrane sheet 1 21 of the outer membrane bag 202 away from the central tube 1 is sealed with the side of the membrane sheet 3 23 of the inner membrane bag 201 away from the central tube 1 by adhesive, and the side of the membrane sheet 22 of the outer membrane bag 202 away from the central tube 1 is sealed with the side of the membrane sheet 4 24 of the inner membrane bag 201 away from the central tube 1 by adhesive; in this way, the central tube 1 11 is connected to the interior of the inner membrane bag 201, that is, the first flow channel L1, and the central tube 2 12 is connected to the interior of the outer membrane bag 202, that is, the second flow channel L2.

[0022] In an optional embodiment, a water inlet K1, a water inlet K2, a water inlet K3, a water inlet K4 and a water inlet K5 are provided on the shell 102, the water inlet K1 is independently connected to the central pipe 11, the water inlet K2 is independently connected to the gap between the membrane assembly 101 and the shell 102, the water inlet K3 is independently connected to the upper end surface of the reverse osmosis membrane element 2, the water inlet K4 is independently connected to the lower end surface of the reverse osmosis membrane element 2, and the water inlet K5 is independently connected to the central pipe 2 12; in a further preferred embodiment, the shell 102 includes a filter cartridge 7 and a filter cartridge cover 6, the filter cartridge cover 6 is provided with inner and outer annular convex walls 1 61 and convex walls 2 62, and the bottom of the filter cartridge 7 is provided with an inner The outer two ring-shaped convex wall three 71 and convex wall four 72, the water inlet one K1, the water inlet two K2 and the water inlet three K3 are arranged on the filter cartridge cover 6, the water inlet one K1 is connected to the inside of the convex wall one 61, the water inlet two K2 is connected to the annular area between the convex wall one 61 and the convex wall two 62, the water inlet three K3 is connected to the outer area of ​​the convex wall two 62, the water inlet four K4 and the water inlet five K5 are arranged on the inner bottom of the filter cartridge 7, the water inlet four K4 is connected to the annular area between the convex wall three 71 and the convex wall four 72, and the water inlet five K5 is connected to the inside of the convex wall four 72; the membrane assembly 101 also includes a sleeve 3, an upper end cover 4 and a lower end cover 5, the sleeve 3 is sleeved on the outer periphery of the sealing sleeve 9, and its upper and lower ends are connected to the sealing sleeve 9. The sleeve 9 is sealed with glue to lock the periphery of the reverse osmosis element to prevent the reverse osmosis membrane element 2 from being debonded due to outward tension, and a long strip-shaped water hole is provided on the side so that the solution in the first flow channel L1 can pass through the water hole to enter the outside of the membrane assembly 101. The upper end cover 4 and the lower end cover 5 are respectively covered on the upper and lower ends of the reverse osmosis membrane element 2, and the side wall is sealed with the outer wall of the sleeve 3. The open end of the central tube 11 is sealed and plugged with the annular convex wall 1 61, the upper end of the upper end cover 4 is sealed and plugged with the annular convex wall 2 62, the open end of the central tube 2 12 is sealed and plugged with the annular convex wall 3 71, and the upper end of the lower end cover 5 is sealed and plugged with the annular convex wall 3 71. The annular convex wall 4 72 is sealed and plugged; in this way, a gap is formed between the membrane assembly 101 and the shell 102 to form an independent water channel, and the side opening of the first flow channel L1 is connected to the water inlet 2 K2, an independent water channel is formed in the central tube 11, and the water inlet 1 K1 is connected to the first flow channel L1, an independent flow channel is formed between the upper end cover 4 and the central tube 1, and the water inlet 3 K3 is connected to the upper end face of the reverse osmosis membrane element 2, an independent flow channel is formed between the lower end cover 5 and the central tube 1, and the water inlet 4 K4 is connected to the lower end face of the reverse osmosis membrane element 2, and an independent water channel is formed in the central tube 2 12, and the water inlet 5 K5 is connected to the second flow channel L2; In an optional embodiment, pipeline 1 E1 is connected to water inlet 1 K1, pipeline 2 E2 is connected to water inlet 2 K2, pipeline 3 E3 and pipeline 4 E4 are connected to water inlet 3 K3 and water inlet 4 K4 respectively, pipeline 5 E5 includes two branches, one for connecting water inlet 5 K5 with water inlet 1 K1, and the other for connecting water inlet 5 K5 with water inlet 4 K4 respectively; in order to ensure that each pipeline has a selective on-off function, an on-off valve needs to be set on each pipeline, and the on-off valves on pipeline 2 E2 and pipeline 4 E4 need to have the function of controlling the concentration ratio, that is, they have three states of fully open, half open and closed, and the on-off valves of other pipelines only need to meet the on-off function, and meet the The above functional requirements and on-off valves that meet the intention of the present invention all belong to the protection scope of the present invention; the solenoid valves used in this embodiment are solenoid valves, the water inlet solenoid valve has only an on-off function, and the concentrated water solenoid valve has three functions: fully open, half open and closed. The specific settings are: a water inlet solenoid valve D1 is connected in series on pipeline E1, a concentrated water solenoid valve D2 is connected in series on pipeline E2, a water inlet solenoid valve D3 is connected in series on pipeline E3, a concentrated water solenoid valve D4 is connected in series on pipeline E4, a water inlet solenoid valve D5 is connected in series on the branch line used for connecting to water outlet K1 in pipeline E5, and a water inlet solenoid valve D6 is connected in series on the branch line used for connecting to water outlet K4.

[0023] In a preferred embodiment, the central tube 1 composed of the central tube 1 11 and the central tube 2 12 is cylindrical, which is convenient for winding the reverse osmosis membrane element.

[0024] In an optional embodiment, if Fig.10 As shown, for the convenience of control, the water inlet solenoid valve 1 D1, the concentrated water solenoid valve 2 D2, the water inlet solenoid valve 3 D3, the concentrated water solenoid valve 4 D4, the water inlet solenoid valve 5 D5 and the water inlet solenoid valve 6 D6 are all electrically connected to the electronic control board 8, and the state of each solenoid valve is controlled by the electronic control board.

[0025] The working principle and control method are described in detail below: (1) The first flow channel L1 is used for filtering, and the third flow channel L3 is used for flushing: Figure 3 , Figure 4 and Figure 8As shown, the water inlet solenoid valve D1, the water inlet solenoid valve D3 and the water inlet solenoid valve D6 are controlled to be open, the concentrated water solenoid valve D2 is half-opened, and the concentrated water solenoid valve D4 and the water inlet solenoid valve D5 are closed. In this way, the pressurized original solution enters through the pipeline E1, passes through the water inlet K1 and the water hole of the central tube 11, enters the first flow channel L1 for filtration, and the concentrated solution flows out through the side opening of the inner membrane bag 201 and enters between the membrane element 101 and the shell 102 , and finally flows out of pipeline two E2 through water inlet two K2 for collection; the pure solution passes through the inner membrane bag 201 into the second flow channel L2 and then enters the central tube two 12, enters pipeline five E5 through water inlet five K5, and enters water inlet four K4 through the branch in pipeline five E5 connected to water inlet four K4. The pure solution enters the third flow channel L3 through the lower end surface of the reverse osmosis membrane element 2 to flush, and then flows out from the upper end surface of the reverse osmosis membrane element 2 and is discharged from pipeline three E3 through water inlet three K3; (2) The third flow channel L3 is filtered and the first flow channel L1 is flushed: Figure 3 , Figure 4 and Fig. 9 As shown, the water inlet solenoid valve 2 and the water inlet solenoid valve 5 D5 are controlled to be open, the concentrated water solenoid valve 4 D4 is half-opened, the concentrated water solenoid valve 2 D2 is fully opened, the water inlet solenoid valve 1 D1 and the water inlet solenoid valve 6 D6 are closed, the pressurized original solution enters through the pipeline 2 E2, passes through the upper end face of the reverse osmosis membrane element 2 through the water inlet 2 K2 and enters the third flow channel L3 for filtration, the concentrated solution flows out through the lower end face of the reverse osmosis membrane element 2, enters the pipeline 4 E4 through the water inlet 4 K4 and flows out for collection; the pure solution passes through the outer membrane bag 202 and enters the second flow channel L2, enters the pipeline 5 E5 through the central tube 2 12 and the water inlet 5 K5, enters the water inlet 1 K1 through the branch in the pipeline 5 E5 connected to the water inlet 1 K1, enters the inner membrane bag 201 through the central tube 1 11 to flush the first flow channel L1, and finally flows out from the side opening of the inner membrane bag 201 and is discharged from the pipeline 2 E2 through the water inlet 2 K2.

[0026] In a preferred embodiment, Figure 3 , Figure 4 , Fig.11 and Fig.12As shown, in order to increase the diversity and flexibility of application, a branch for independently connecting the water inlet five K5 to the outside for discharging pure solution can be further provided in the pipeline five E5, and a water inlet solenoid valve seven D7 is provided on the branch, and the water inlet solenoid valve seven D7 is electrically connected to the electric control board; when it is necessary to improve the filtering efficiency, the third flow channel L3 and the first flow channel L1 work at the same time, specifically: the water inlet solenoid valve five D5 and the water inlet solenoid valve six D6 are controlled to be closed, the other water inlet solenoid valves are all opened, the concentrated water solenoid valve is half-opened, the pressurized original solution enters through the pipeline one E1 and the pipeline three E3, is filtered through the first flow channel L1 and the third flow channel L3, the concentrated solution is discharged from the pipeline two E2 and the pipeline four E4, and the pure solution is discharged through the water inlet five K5 through the branch connected to the outside in the pipeline five E5; when it is necessary to use the first flow channel L1 or the third flow channel L3 alone, it is only necessary to control the solenoid valve seven to be closed at the same time based on the working principle and control method described above, and the details will not be repeated.

[0027] The beneficial effects of the present invention are as follows: through the unique design of the reverse osmosis membrane element 2, it is composed of an outer membrane bag 202 and an inner membrane bag 201, the inner membrane bag 201 is located inside the outer membrane bag 202, the outer membrane bag 202 is composed of a membrane sheet 1 21 and a membrane sheet 22 arranged in front of each other, and the inner membrane bag 201 is composed of a membrane sheet 3 23 and a membrane sheet 4 24 arranged in front of each other; in this way, after the membrane element is wound on the central tube, two flow channels (the first flow channel L1 and the third flow channel L3) for filtering and a common flow channel (the second flow channel L2) for collecting pure solution are formed inside; coupled with the on-off control of multiple pipelines, it can be used for concentration and separation When filtering is performed in one of the flow channels, the filtered pure solution can directly enter the other filtering flow channel for automatic and continuous solubility and high-efficiency flushing; the two filtering flow channels can be used alternately, so that the device can achieve continuous and uninterrupted filtering work while the flushing of the other filtering flow channel is also carried out uninterruptedly and automatically, which greatly improves the life of the reverse osmosis membrane, realizes the resource reuse of the pure solution, and reduces the flushing cost; by adding an independent branch connected to the outside in the pipeline five E5 for discharging the pure solution, when it is necessary to improve the filtering efficiency, the two filtering flow channels can also be used at the same time, making the use of the device more flexible and diverse.

[0028] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. An automatic flushing reverse osmosis filter device, comprising a filter device and a pipeline connected thereto, characterized in that: The filtering device comprises: a shell; a membrane assembly, which is installed in the shell and comprises a central tube and a reverse osmosis membrane element, wherein the reverse osmosis membrane element is wound around the outer periphery of the central tube, wherein the central tube has a central tube 1 and a central tube 2 which are independent of each other, and the central tube 1 and the central tube 2 are both open at one end and closed at the other end; the reverse osmosis membrane element is composed of an outer membrane bag and an inner membrane bag, wherein the inner membrane bag is located inside the outer membrane bag, wherein the outer membrane bag is composed of a membrane sheet 1 and a membrane sheet 2 arranged with their front faces facing each other, and the inner membrane bag is composed of a membrane sheet 3 and a membrane sheet 4 arranged with their front faces facing each other; a first flow channel is formed inside the inner membrane bag and is connected to the central tube 1, a side opening of the inner membrane bag away from the central tube is arranged to be connected to the outside of the reverse osmosis membrane element and the other sides are sealed, and the outer membrane bag is sealed all around to form a flow channel inside the inner membrane bag. The second flow channel is connected with the central tube two; after the membrane element is spirally wound around the outer periphery of the central tube, an annular gap is formed between the outer surfaces of the outer membrane bags along the length direction of the central tube to constitute the third flow channel, and a sealing adhesive is set at the gap port located at the outermost periphery; a sealing sleeve is provided on the outermost surface of the reverse osmosis membrane element, and the sealing sleeve does not block the side opening of the inner membrane bag; the pipeline includes: pipeline one, which is used to connect to the central tube one and can be selectively opened and closed; pipeline two, which is used to connect to the side opening of the inner membrane bag away from the central tube and can be selectively opened and closed; pipeline three and pipeline four, which are used to connect to the two ports of the third flow channel respectively and can be selectively opened and closed; pipeline five, which is used to connect the central tube two with the central tube one and any port of the third flow channel respectively and can be selectively opened and closed.

2. The automatic flushing reverse osmosis filtration device according to claim 1, characterized in that: The upper and lower sides of the outer film bag and the inner film bag are sealed and bonded as a whole, and the sides of the outer film bag and the inner film bag close to the central tube are sealed and bonded separately, and the side of the inner film bag close to the central tube is shrunk inside the outer film bag, and the inner film bag is opened on one side away from the central tube, and the side of the outer film bag film sheet 1 away from the central tube and the side of the inner film bag film sheet 3 away from the central tube are sealed by adhesive, and the side of the outer film bag film sheet 2 away from the central tube and the side of the inner film bag film sheet 4 away from the central tube are sealed by adhesive.

3. The automatic flushing reverse osmosis filtration device according to claim 1, characterized in that: The shell is provided with water inlet 1, water inlet 2, water inlet 3, water inlet 4 and water inlet 5, the water inlet 1 is independently connected to the central pipe 1, the water inlet 2 is independently connected to the gap between the membrane assembly and the shell, the water inlet 3 is independently connected to the upper end surface of the reverse osmosis membrane element, the water inlet 4 is independently connected to the lower end surface of the reverse osmosis membrane element, and the water inlet 5 is independently connected to the central pipe 2; the pipeline 1 is connected to the water inlet 1, the pipeline 2 is connected to the water inlet 2, the pipeline 3 and the pipeline 4 are respectively connected to the water inlet 3 and the water inlet 4, and the pipeline 5 is used to connect the water inlet 5 with the water inlet 1 and the water inlet 4 respectively.

4. The automatic flushing reverse osmosis filtration device according to claim 3, characterized in that: The pipeline one is connected in series with a water inlet solenoid valve one, the pipeline two is connected in series with a concentrated water solenoid valve two, the pipeline three is connected in series with a water inlet solenoid valve three, the pipeline four is connected in series with a concentrated water solenoid valve four, the branch line of the pipeline five used for communicating with the water outlet one is connected in series with a water inlet solenoid valve five, and the branch line used for communicating with the water outlet four is connected in series with a water inlet solenoid valve six.

5. The automatic flushing reverse osmosis filtration device according to claim 1, characterized in that: The membrane assembly also includes: a sleeve, which is sleeved on the outer circumference of the sealing sleeve and has a long strip of water holes on the side, and the upper and lower ends of the sleeve are sealed with glue; an upper end cover and a lower end cover, which are respectively covered on the upper and lower ends of the reverse osmosis membrane element, and the side wall is sealed with the outer wall of the sleeve.

6. The automatic flushing reverse osmosis filtration device according to claim 5, characterized in that: The shell includes a filter cartridge and a filter cartridge cover. The filter cartridge cover is provided with two inner and outer circles of annular convex wall one and convex wall two. The bottom of the filter cartridge is provided with two inner and outer circles of annular convex wall three and convex wall four. The opening end of the center tube one is sealed and plugged with the annular convex wall one, and the upper end of the upper end cover is sealed and plugged with the annular convex wall two. The opening end of the center tube two is sealed and plugged with the annular convex wall three, and the upper end of the lower end cover is sealed and plugged with the annular convex wall four.

7. The automatic flushing reverse osmosis filtration device according to claim 4, characterized in that: The water inlet solenoid valve one, water inlet solenoid valve three and water inlet solenoid valve six are opened, the concentrated water solenoid valve two is half opened, the concentrated water solenoid valve four and water inlet solenoid valve five are closed, the original solution enters the first flow channel through pipeline one for filtration, the concentrated solution flows out through pipeline two, the pure solution enters the second flow channel through pipeline five and enters water outlet four, and is discharged from pipeline three after flushing the third flow channel.

8. The automatic flushing reverse osmosis filtration device according to claim 4, characterized in that: The water inlet solenoid valve 2 and the water inlet solenoid valve 5 are opened, the concentrated water solenoid valve 4 is half opened, the concentrated water solenoid valve 2 is fully opened, the water inlet solenoid valve 1 and the water inlet solenoid valve 6 are closed, the original solution enters the third flow channel through pipeline 2 for filtration, the concentrated solution flows out through pipeline 4, the pure solution enters the second flow channel and enters the water outlet 1 through pipeline 5, and is discharged from pipeline 2 after flushing the first flow channel.

9. The automatic flushing reverse osmosis filtration device according to claim 1, characterized in that: The central tube composed of the central tube one and the central tube two is cylindrical.

10. The automatic flushing reverse osmosis filtration device according to claim 4, characterized in that: The pipeline 5 is also provided with a branch line which is independently connected to the outside and used for discharging the pure solution, and the branch line is provided with a water inlet solenoid valve 7.

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