Integrated reverse osmosis filter element and filtration system having the filter element

Abstract

An integrated reverse osmosis filter element is provided with a first reverse osmosis unit for preparing pure water, a second reverse osmosis unit for flushing the first reverse osmosis unit, and a central tube assembly. The first reverse osmosis unit and the second reverse osmosis unit of the integrated reverse osmosis filter element are rolled into a whole with the central assembly, and no additional components are added, thereby simplifying the appearance structure of the integrated reverse osmosis filter element. When the integrated reverse osmosis filter element is in flushing condition, the second reverse osmosis unit can prepare pure water alone, and use the pure water to flush the concentrated water remaining inside the first reverse osmosis unit, thereby alleviating the "first cup of water" problem caused by salt diffusion during shutdown and standing. The pure water produced by the second reverse osmosis unit backwashes the water inlet surface of the second reverse osmosis unit from the water production surface of the first reverse osmosis unit.

Description

Technical Field

[0001] The invention relates to the field of reverse osmosis, and in particular to an integrated reverse osmosis filter element and a filtering system having the filter element. Background Art

[0002] When the reverse osmosis filter is at rest, the ions on the wastewater side will penetrate into the pure water side, causing the total dissolved solids (TDS) of the pure water to rise. When the system is restarted, the ion concentration of the pure water that came out earlier is too high, forming the so-called "first cup of water" problem of the water purifier.

[0003] In the prior art, some reverse osmosis filter elements use two membrane filter elements. When the system is shut down, pure water is generated by one membrane filter element to flush the other membrane filter element, thereby alleviating the problem of first cup water. However, the disadvantage of this reverse osmosis filter element is that it has two membrane filters, which results in a larger size of the reverse osmosis filter element. Another part of the reverse osmosis filter element is provided with a water storage tank or a water storage bag, which is used to store pure water. Pure water is squeezed out of the water storage tank or the water storage bag for flushing when the system is to be shut down. This reverse osmosis filter element also adds a redundant unit, resulting in a larger size of the reverse osmosis filter element.

[0004] Therefore, in view of the shortcomings of the prior art, it is necessary to provide an integrated reverse osmosis filter element and a filtration system having the filter element to solve the shortcomings of the prior art. Summary of the invention

[0005] One of the purposes of the present invention is to avoid the shortcomings of the prior art and provide an integrated reverse osmosis filter element. The integrated reverse osmosis filter element has the advantage of solving the problem of "first cup of water".

[0006] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0007] Provided is an integrated reverse osmosis filter element, which comprises a first reverse osmosis unit for preparing pure water, a second reverse osmosis unit for flushing the first reverse osmosis unit, and a central tube assembly. The first reverse osmosis unit and the second reverse osmosis unit are rolled and integrated into a whole with the central tube assembly, and the second reverse osmosis unit is connected to the first reverse osmosis unit through the central tube assembly.

[0008] During operation, raw water enters the first reverse osmosis unit for reverse osmosis to obtain pure water A and concentrated water A, which are then discharged from the integrated reverse osmosis filter element.

[0009] During the flushing condition, the raw water enters the second reverse osmosis unit to reverse osmosis to obtain pure water B and concentrated water B. The pure water B enters the first reverse osmosis unit and then is discharged from the integrated reverse osmosis filter element, and the concentrated water B is discharged from the integrated reverse osmosis filter element.

[0010] Preferably, the first reverse osmosis unit is provided with an inlet membrane group and a concentrate membrane group, and the inlet membrane group and the concentrate membrane group are connected with each other through a pipeline.

[0011] Preferably, the water inlet membrane group is provided with S1 water inlet membranes, the concentrated water membrane group is provided with S2 concentrated water membranes, and 15>S1≥1, 15>S2≥1, and S1+S2≤15, and S1 and S2 are both positive integers.

[0012] Preferably, the above-mentioned central tube assembly is provided with a first concentrated water central tube for transporting concentrated water produced by the first reverse osmosis unit, a pure water central tube for transporting pure water produced by the first reverse osmosis unit and the second reverse osmosis unit, and a second concentrated water central tube for transporting concentrated water produced by the second reverse osmosis unit. The first concentrated water central tube is connected to the first reverse osmosis unit, the pure water central tube is connected to the first reverse osmosis unit and the second reverse osmosis unit respectively, and the second concentrated water central tube is connected to the second reverse osmosis unit.

[0013] Preferably, the water inlet membrane and the concentrated water membrane are both provided with a water production surface and a water inlet surface.

[0014] Preferably, the above-mentioned water inlet membrane is a reverse osmosis membrane folded into a double-layer rectangular structure, with the water inlet surfaces opposite, the folded edge being the short side of the rectangle, the folded edge being defined as the first width A, the short side opposite to the folded edge being defined as the second width A, and the two long sides adjacent to the folded edge being defined as the first length A and the second length A, the first length A and the second length A are respectively sealed along the water inlet surface, and the second length A leaves a concentrated water outlet away from the first width A, and the second width A is the first raw water inlet.

[0015] Preferably, the above-mentioned concentrated water membrane is a reverse osmosis membrane folded into a double-layer rectangular structure with the water inlet surfaces opposite, the folded edge is the short side of the rectangle, the folded edge is defined as the first width B, the short side opposite to the folded edge is defined as the second width B, the two long sides adjacent to the folded edge are defined as the first length B and the second length B, the first concentrated water center tube is seamlessly connected to the water inlet surface, and the first concentrated water center tube is parallel to the first width B, the first length B is sealed along the water inlet surface and a concentrated water inlet is left and away from the first width B, the second width B and the first length B are respectively sealed along the water inlet surface.

[0016] Preferably, the first concentrated water central tube is not connected to the water production surface.

[0017] Preferably, the first width A mentioned above is offset against the pure water center tube, and the pure water center tube is not connected to the water inlet surface.

[0018] Preferably, the first concentrated water central tube is provided with S2 strips, which correspond one-to-one to the concentrated water membranes.

[0019] Preferably, the second reverse osmosis unit is provided with S3 flushing membranes, S+S2≥S3≥1, and S3 is a positive integer.

[0020] Preferably, the flushing membrane is provided with a water production surface and a water inlet surface.

[0021] Preferably, the flushing membrane is a reverse osmosis membrane folded into a double-layer rectangular structure, with water inlet surfaces facing each other, the folded edge being the short side of the rectangle, the folded edge being defined as the first width C, the short side opposite to the folded edge being defined as the second width C, the two long sides adjacent to the folded edge being defined as the first length C and the second length C, the second concentrated water center tube being seamlessly connected to the water inlet surface, the second concentrated water center tube being parallel to the first width C, the first length C being sealed and leaving a second raw water inlet, and the second raw water inlet being far away from the first width C.

[0022] Preferably, the second concentrated water center tube is not connected to the water production surface.

[0023] Preferably, the second concentrated water central tube is provided with S3 strips, which correspond one to one with the flushing membranes.

[0024] When the concentrated water film, the water inlet film and the flushing membrane are unfolded, the first length A, the first length B and the first length C are located on the same side, the second length A, the second length B and the second length C are located on the same side, the first width A, the first width B and the first width C are located on the same side, and the second width A, the second width B and the second width C are located on the same side.

[0025] A first sealing device is provided along the second width A, the first length A and the second length A of the water production surface of the water inlet membrane. The sealing device is sealed and connected to the corresponding positions of the flushing membrane, the water inlet membrane or the concentrated water membrane adjacent to the water inlet membrane, respectively, to form a first pure water chamber structure with the first width A as the outlet.

[0026] A second sealing device is provided along the second width B, the first length B and the second length B of the water production surface of the concentrated water membrane. The sealing device is sealed and connected to the corresponding positions of the flushing membrane, the water inlet membrane or the concentrated water membrane adjacent to the water inlet membrane, respectively, to form a second pure water chamber structure with the first width B as the outlet.

[0027] A third sealing device is provided along the second width C, the first length C and the second length C of the water production surface of the flushing membrane. The sealing device is sealed and connected to the corresponding positions of the flushing membrane, the water inlet membrane or the concentrated water membrane adjacent to the water inlet membrane, respectively, to form a third pure water chamber structure with the first width C as the outlet.

[0028] The first width A, the first width B and the first width C are respectively offset against the pure water central tube.

[0029] During operation, raw water enters the water inlet membrane from the first raw water inlet, and the raw water is reverse osmotic through the water inlet membrane to obtain pure water A1 and concentrated water A1, pure water A1 enters the first pure water cavity structure and is discharged from the integrated reverse osmosis filter element through the pure water center tube, concentrated water A1 flows out through the concentrated water outlet and turns to flow into the concentrated water inlet, and then concentrated water A1 enters the concentrated water membrane, and concentrated water A1 is reverse osmotic through the concentrated water membrane to obtain pure water A2 and concentrated water A2, pure water A2 enters the second pure water cavity structure and is discharged from the integrated reverse osmosis filter element through the pure water center tube, and concentrated water A2 is discharged from the integrated reverse osmosis filter element through the first concentrated water center tube.

[0030] During the flushing condition, the pure water center tube is blocked, and the raw water enters the flushing membrane from the second raw water inlet. The raw water is reversely osmotic through the flushing membrane to obtain pure water B and concentrated water B. Pure water B enters the third pure water chamber structure and is reversely flushed from the water production surface to the water inlet surface. Finally, pure water B is discharged from the integrated reverse osmosis filter element from the first raw water inlet, and concentrated water B is discharged from the integrated reverse osmosis filter element through the second concentrated water center tube.

[0031] The integrated reverse osmosis filter element of the present invention is an integrated reverse osmosis filter element in which an inlet membrane, a concentrated water membrane and a flushing membrane are wound around a first concentrated water central tube, a second concentrated water central tube and a pure water central tube as axes.

[0032] The integrated reverse osmosis filter element of the present invention is also provided with an upper end cover for diverting concentrated water A1 from the concentrated water outlet to the concentrated water inlet. The upper end cover is sealingly assembled on the water inlet membrane, the concentrated water membrane and the flushing membrane and is located on the first long A side. The lower end cover is sealingly assembled on the water inlet membrane, the concentrated water membrane and the flushing membrane and is located on the second long A side.

[0033] An integrated reverse osmosis filter element of the present invention is provided with a first reverse osmosis unit for preparing pure water, a second reverse osmosis unit for flushing the first reverse osmosis unit, and a central tube assembly. The first reverse osmosis unit and the second reverse osmosis unit are rolled and integrated into a whole with the central tube assembly, and the second reverse osmosis unit is connected to the first reverse osmosis unit through the central tube assembly. The first reverse osmosis unit and the second reverse osmosis unit of the integrated reverse osmosis filter element of the present invention are rolled into a whole with the central assembly, and no additional devices are added, thereby simplifying the appearance structure of the integrated reverse osmosis filter element. When the integrated reverse osmosis filter element is in flushing condition, the second reverse osmosis unit can prepare pure water alone, and use the pure water to flush the concentrated water remaining inside the first reverse osmosis unit, thereby alleviating the "first cup of water" problem caused by salt diffusion during shutdown and standing. The pure water produced by the second reverse osmosis unit reversely flushes the water inlet surface of the second reverse osmosis unit from the water production surface of the first reverse osmosis unit. The flushing effect of this directional flushing method is better than that of the forward flushing method.

[0034] Another object of the present invention is to avoid the shortcomings of the prior art and provide a filtration system having the filter element. The filtration system has the advantage of solving the problem of "first cup of water".

[0035] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0036] Provided is a filtration system having the above-mentioned integrated reverse osmosis filter element.

[0037] A filtration system of the present invention has an integrated reverse osmosis filter element, which can be flushed when the system is stopped and stationary, thereby solving the problem of "first cup of water" and does not increase the size of the multi-filtration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0039] Figure 1 Schematic diagram of the folding process of the water inlet membrane of an integrated reverse osmosis filter element.

[0040] Figure 2 Schematic diagram of the concentrate membrane folding process of an integrated reverse osmosis filter element.

[0041] Figure 3 Schematic diagram of the flushing membrane folding process of an integrated reverse osmosis filter element.

[0042] Figure 4 Schematic diagram of the folding process between the water-producing surface and the adjacent water-producing surface.

[0043] Figure 5 Schematic diagram of water flow direction on the water inlet surface of the water inlet membrane.

[0044] Figure 6 Schematic diagram of water flow direction at the inlet surface of the concentrated water film.

[0045] Figure 7 It is a schematic diagram of the water flow direction on the water production surface during working conditions.

[0046] Figure 8 Schematic diagram of water flow direction on the water inlet surface of the membrane flushing.

[0047] Fig. 9 This is a schematic diagram of the water flow direction on the water production surface during flushing conditions.

[0048] Fig.10 It is a cross-sectional schematic diagram of the first reverse osmosis unit, the second reverse osmosis unit and the central tube assembly when they are rolled and integrated.

[0049] Fig.11 This is a schematic diagram of the structure of an integrated reverse osmosis filter element of Example 2.

[0050] Figures 1 to 11 Including:

[0051] Inlet membrane 11, first width A 111, second width A 112, first length A 113, second length A 114, concentrated water outlet 115, first raw water inlet 116,

[0052] Concentrated water film 12, first width B 121, second width B 122, first length B 123, second length B 124, concentrated water inlet 125,

[0053] Flushing membrane 2, first width C 21, second width C 22, first length C 23, second length C 24, second raw water inlet 25,

[0054] The first concentrated water center tube 31, the pure water center tube 32, the second concentrated water center tube 33,

[0055] Water production surface 4, water inlet surface 5, upper end cover 6, lower end cover 7. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described in conjunction with the following embodiments.

[0057] Example 1.

[0058] An integrated reverse osmosis filter element, such as Figures 1 to 9 As shown, a first reverse osmosis unit for preparing pure water, a second reverse osmosis unit for flushing the first reverse osmosis unit and a central tube assembly are provided. The first reverse osmosis unit and the second reverse osmosis unit are rolled and integrated into a whole with the central tube assembly, and the second reverse osmosis unit is connected to the first reverse osmosis unit through the central tube assembly.

[0059] During operation, raw water enters the first reverse osmosis unit for reverse osmosis to obtain pure water A and concentrated water A, which are then discharged from the integrated reverse osmosis filter element.

[0060] During the flushing condition, the raw water enters the second reverse osmosis unit to reverse osmosis to obtain pure water B and concentrated water B. The pure water B enters the first reverse osmosis unit and then is discharged from the integrated reverse osmosis filter element, and the concentrated water B is discharged from the integrated reverse osmosis filter element.

[0061] The first reverse osmosis unit is provided with an inlet water membrane group 11 and a concentrate water membrane group 12, and the inlet water membrane group 11 and the concentrate water membrane group 12 are connected with each other through a pipeline.

[0062] The water inlet membrane 11 group is provided with S1 water inlet membranes 11, the concentrated water membrane 12 group is provided with S2 concentrated water membranes 12, and 15>S1≥1, 15>S2≥1, and S1+S2≤15, and S1 and S2 are both positive integers.

[0063] In this embodiment, S1 is 1, and S2 is 1. It should be noted that S1 of the present invention can be 1, or 2, 3, 4, 6, 8, 12, 14, etc., and S2 of the present invention can be 1, or 2, 3, 4, 6, 8, 12, 14, etc., as long as S1+S2 is less than or equal to 15, and the specific implementation method depends on the actual situation.

[0064] The purpose of the present invention for dividing the first reverse osmosis unit into an inlet membrane group 11 and a concentrated water membrane group 12 is to extend the path of raw water flow in the first reverse osmosis unit with the same water volume and the same effective area, thereby increasing the flow rate of raw water, thereby reducing the risk of scaling and increasing the service life.

[0065] The central tube assembly is provided with a first concentrated water central tube 31 for transporting concentrated water produced by the first reverse osmosis unit, a pure water central tube 32 for transporting pure water produced by the first reverse osmosis unit and the second reverse osmosis unit, and a second concentrated water central tube 33 for transporting concentrated water produced by the second reverse osmosis unit. The first concentrated water central tube 31 is connected to the first reverse osmosis unit, the pure water central tube 32 is connected to the first reverse osmosis unit and the second reverse osmosis unit respectively, and the second concentrated water central tube 33 is connected to the second reverse osmosis unit.

[0066] Both the water inlet membrane 11 and the concentrated water membrane 12 are provided with a water production surface 4 and a water inlet surface 5 .

[0067] The water production surface 4 and the water inlet surface 5 of the present invention are common knowledge, and those skilled in the art should be aware of the functions and differences between the water production surface 4 and the water inlet surface 5, which will not be described again here.

[0068] The water inlet membrane 11 is a reverse osmosis membrane folded into a double-layer rectangular structure, with the water inlet surface 5 opposite, the folded edge being the short side of the rectangle, the folded edge is defined as a first width A 111, the short side opposite to the folded edge is defined as a second width A 112, and the two long sides adjacent to the folded edge are defined as a first length A 113 and a second length A 114, the first length A 113 and the second length A 114 are respectively sealed along the water inlet surface 5, and the second length A 114 leaves a concentrated water outlet 115 away from the first width A 111, and the second width A 112 is a first raw water inlet 116.

[0069] The concentrate membrane 12 is a reverse osmosis membrane folded into a double-layer rectangular structure with the water inlet surface 5 opposite, the folded edge is the short side of the rectangle, the folded edge is defined as the first width B121, the short side opposite to the folded edge is defined as the second width B122, and the two long sides adjacent to the folded edge are defined as the first length B123 and the second length B124. The first concentrate center tube 31 is seamlessly connected to the water inlet surface 5, and the first concentrate center tube 31 is parallel to the first width B121. The first length B123 is sealed along the water inlet surface 5 and a concentrate water inlet 125 is left and is away from the first width B121. The second width B122 and the first length B123 are sealed along the water inlet surface 5 respectively.

[0070] The first concentrated water central pipe 31 is not connected to the water production surface 4 .

[0071] The first width A 111 abuts against the pure water central tube 32 , and the pure water central tube 32 is not connected to the water inlet surface 5 .

[0072] The first concentrated water central tube 31 is provided with S2 strips, namely 1, and the first concentrated water central tube 31 corresponds to the concentrated water membrane 12 one by one.

[0073] The second reverse osmosis unit is provided with S3 flushing membranes 2, S+S2≥S3≥1, and S3 is a positive integer. The flushing membrane 2 of this embodiment is specifically 1. It should be noted that the flushing membrane 2 of the present invention can be 1, or 2, 3, 4, 5, 6, 8, 9 or 10, as long as the number of flushing membranes 2 does not exceed the total number of concentrated water membranes 12 and inlet water membranes 11, and the specific number can be determined according to actual conditions.

[0074] The flushing membrane 2 is provided with a water production surface 4 and a water inlet surface 5 .

[0075] The flushing membrane 2 is a reverse osmosis membrane folded into a double-layer rectangular structure, with the water inlet surface 5 opposite, the folded edge is the short side of the rectangle, the folded edge is defined as the first width C 21, the short side opposite to the folded edge is defined as the second width C 22, the two long sides adjacent to the folded edge are defined as the first length C 23 and the second length C 24, the second concentrated water center tube 33 is seamlessly connected to the water inlet surface 5, the second concentrated water center tube 33 is parallel to the first width C 21, the first length C 23 is sealed and a second raw water inlet 25 is left, and the second raw water inlet 25 is far away from the first width C 21.

[0076] The second concentrated water central pipe 33 is not connected to the water production surface 4 .

[0077] The second concentrated water central tube 33 is provided with S3 strips, namely 2, and the flushing membrane 2 corresponds to the second concentrated water central tube 33 one by one.

[0078] When the concentrated water membrane 12, the water inlet membrane 11 and the flushing membrane 2 are unfolded, the first length A 113, the first length B 123 and the first length C23 are located on the same side, the second length A 114, the second length B 124 and the second length C 24 are located on the same side, the first width A 111, the first width B 121 and the first width C 21 are located on the same side, and the second width A 112, the second width B 122 and the second width C 22 are located on the same side.

[0079] The water production surface 4 of the water inlet membrane 11 is provided with a first sealing device along the second width A 112, the first length A 113 and the second length A 114. The sealing device is sealed and connected to the corresponding positions of the flushing membrane 2, the water inlet membrane 11 or the concentrated water membrane 12 adjacent to the water inlet membrane 11, respectively, to form a first pure water cavity structure with the first width A 111 as the outlet.

[0080] The water production surface 4 of the concentrated water membrane 12 is provided with a second sealing device along the second width B122, the first length B123 and the second length B124. The sealing device is sealed and connected to the corresponding positions of the flushing membrane 2 adjacent to the water inlet membrane 11, the water inlet membrane 11 or the concentrated water membrane 12, respectively, to form a second pure water chamber structure with the first width B121 as the outlet.

[0081] The water production surface 4 of the flushing membrane is provided with a third sealing device along the second width C 22, the first length C 23 and the second length C 24. The sealing device is sealed and connected to the flushing membrane 2 adjacent to the water inlet membrane 11, the water inlet membrane 11 or the concentrated water membrane 12 at corresponding positions, respectively, to form a third pure water chamber structure with the first width C 21 as the outlet.

[0082] It should be noted that the first pure water chamber structure, the second pure water chamber structure or the third pure water chamber structure of the present invention is combined with the adjacent first pure water chamber structure, the second pure water chamber structure or the third pure water chamber structure to form a pure water containing chamber. For example, the first pure water chamber structure is combined with another first pure water chamber structure to form a pure water containing chamber, or the first pure water chamber structure and the second pure water chamber structure are combined to form a pure water containing chamber, or the first pure water chamber structure and the third pure water chamber structure are combined to form a pure water containing chamber, depending on whether the water inlet membrane 11 is adjacent to another water inlet membrane 11, or the concentrated water membrane 12 or the flushing water membrane. The overlapping order of the water inlet membrane 11, the concentrated water membrane 12 and the flushing water membrane of the present invention can be fixed or random.

[0083] The first width A 111 , the first width B 121 , and the first width C 21 are respectively against the pure water central tube 32 .

[0084] During operation, raw water enters the water inlet membrane 11 from the first raw water inlet 116, and the raw water is reverse osmotic through the water inlet membrane 11 to obtain pure water A1 and concentrated water A1, pure water A1 enters the first pure water cavity structure and is discharged from the integrated reverse osmosis filter element through the pure water center tube 32, concentrated water A1 flows out through the concentrated water outlet 115 and turns to flow into the concentrated water inlet 125, and then concentrated water A1 enters the concentrated water membrane 12, and concentrated water A1 is reverse osmotic through the concentrated water membrane 12 to obtain pure water A2 and concentrated water A2, pure water A2 enters the second pure water cavity structure and is discharged from the integrated reverse osmosis filter element through the pure water center tube 32, and concentrated water A2 is discharged from the integrated reverse osmosis filter element through the first concentrated water center tube 31.

[0085] During the flushing condition, the pure water center tube 32 is blocked, and the raw water enters the flushing membrane 2 from the second raw water inlet 25. The raw water is reversely osmotic through the flushing membrane 2 to obtain pure water B and concentrated water B. The pure water B enters the third pure water chamber structure and is reversely flushed from the water production surface 4 to the water inlet surface 5. Finally, the pure water B is discharged from the integrated reverse osmosis filter element from the first raw water inlet 116, and the concentrated water B is discharged from the integrated reverse osmosis filter element through the second concentrated water center tube 33.

[0086] The integrated reverse osmosis filter element of the present invention is an integrated reverse osmosis filter element in which the water inlet membrane 11, the concentrated water membrane 12 and the flushing membrane 2 are wound around the first concentrated water central tube 31, the second concentrated water central tube 33 and the pure water central tube 32 as the axis.

[0087] The first reverse osmosis unit and the second reverse osmosis unit of the integrated reverse osmosis filter element of the present invention are rolled into a whole with the central component, and no additional components are added, thereby simplifying the appearance structure of the integrated reverse osmosis filter element. When the integrated reverse osmosis filter element is in flushing condition, the second reverse osmosis unit can prepare pure water alone, and use this pure water to flush the residual concentrated water inside the first reverse osmosis unit, thereby alleviating the "first cup of water" problem caused by salt diffusion during shutdown and standing. The pure water produced by the second reverse osmosis unit is reversely flushed from the water production surface 4 of the first reverse osmosis unit to the water inlet surface 5 of the second reverse osmosis unit. The flushing effect of this directional flushing method is better than that of the forward flushing method.

[0088] Example 2.

[0089] An integrated reverse osmosis filter element, such as Fig.10 and Fig.11 As shown, other features are the same as those of Example 1, except that an upper end cover 6 is also provided for diverting concentrated water A1 from concentrated water outlet 115 to concentrated water inlet 125, the upper end cover 6 is sealingly assembled on the water inlet membrane 11, concentrated water membrane 12 and flushing membrane 2 and is located on the side of the first length A 113, and the lower end cover 7 is sealingly assembled on the water inlet membrane 11, concentrated water membrane 12 and flushing membrane 2 and is located on the side of the second length A 114.

[0090] Compared with Example 1, this embodiment ensures the integrity of the overall structure of an integrated reverse osmosis filter element, and at the same time realizes the flow direction reversal of the concentrated water A1 through the upper end cover 6, simplifying the water connection from the concentrated water outlet 115 to the concentrated water inlet 125. The setting of the lower end cover 7 can increase the sealing strength of the integrated reverse osmosis filter element.

[0091] Example 3.

[0092] An integrated reverse osmosis filter element, other features are the same as those of Example 1, except that: S1 of this embodiment is 5, and S2 is 1. It should be noted that S1 of the present invention can be 3. The flushing membrane 2 of this embodiment is specifically 3 sheets.

[0093] Compared with Example 1, the integrated reverse osmosis filter element of this embodiment has higher efficiency.

[0094] Example 4.

[0095] A filtration system having the filter element comprises the integrated reverse osmosis filter element of embodiment 1.

[0096] A filter system that can be flushed when not in use, solving the "first cup of water" problem without increasing the size of a multi-filter system.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An integrated reverse osmosis filter element, characterized in that: A first reverse osmosis unit for preparing pure water, a second reverse osmosis unit for flushing the first reverse osmosis unit and a central tube assembly are provided, the first reverse osmosis unit and the second reverse osmosis unit are rolled and integrated into a whole, and the second reverse osmosis unit is connected to the first reverse osmosis unit through the central tube assembly; In the operating condition, raw water enters the first reverse osmosis unit for reverse osmosis to obtain pure water A and concentrated water A, and the pure water A and concentrated water A are discharged from the integrated reverse osmosis filter element respectively; In the flushing condition, the raw water enters the second reverse osmosis unit for reverse osmosis to obtain pure water B and concentrated water B. The pure water B enters the first reverse osmosis unit and then is discharged from the integrated reverse osmosis filter element, and the concentrated water B is discharged from the integrated reverse osmosis filter element; the first reverse osmosis unit is provided with an inlet membrane group and a concentrated water membrane group, and the inlet membrane group and the concentrated water membrane group are connected by a pipeline; The water inlet membrane group is provided with S1 water inlet membranes, the concentrate membrane group is provided with S2 concentrate membranes, and 15>S1≥1, 15>S2≥1, and S1+S2≤15, S1 and S2 are both positive integers; the central tube assembly is provided with a first concentrate central tube for conveying concentrate produced by the first reverse osmosis unit, a pure water central tube for conveying pure water produced by the first reverse osmosis unit and the second reverse osmosis unit, and a second concentrate central tube for conveying concentrate produced by the second reverse osmosis unit, the first concentrate central tube is connected to the first reverse osmosis unit, the pure water central tube is connected to the first reverse osmosis unit and the second reverse osmosis unit respectively, and the second concentrate central tube is connected to the second reverse osmosis unit; the water inlet membrane and the concentrate membrane are both provided with a water production surface and a water inlet surface; The water inlet membrane is a reverse osmosis membrane folded in half into a double-layer rectangular structure, with the water inlet surfaces facing each other, the folded side being the short side of the rectangle, the folded side being defined as a first width A, the short side opposite to the folded side being defined as a second width A, and the two long sides adjacent to the folded side being defined as a first length A and a second length A, the first length A and the second length A being sealed along the water inlet surface respectively, and the second length A leaving a concentrated water outlet away from the first width A, and the second width A being the first raw water inlet; The concentrated water membrane is a reverse osmosis membrane folded in half into a double-layer rectangular structure with water inlet surfaces facing each other, the folded side is the short side of the rectangle, the folded side is defined as a first width B, the short side opposite to the folded side is defined as a second width B, and the two long sides adjacent to the folded side are defined as a first length B and a second length B. The first concentrated water center tube is seamlessly connected to the water inlet surface, and the first concentrated water center tube is parallel to the first width B. The first length B is sealed along the water inlet surface and a concentrated water inlet is left and is away from the first width B. The second width B and the first length B are respectively sealed along the water inlet surface; The first concentrated water central pipe is not connected to the water production surface; The first width A is offset against the pure water center tube, and the pure water center tube is not connected to the water inlet surface; The first concentrated water central tube is provided with S2 strips, and each of the concentrated water membranes corresponds to the other one; the second reverse osmosis unit is provided with S3 flushing membranes, S+S2≥S3≥1, S3 is a positive integer; the flushing membrane is provided with a water production surface and a water inlet surface; The flushing membrane is a reverse osmosis membrane folded in half into a double-layer rectangular structure, and the water inlet surfaces are opposite, the folded side is the short side of the rectangle, the folded side is defined as the first width C, the short side opposite to the folded side is defined as the second width C, and the two long sides adjacent to the folded side are defined as the first length C and the second length C. The second concentrated water center tube is seamlessly connected to the water inlet surface, the second concentrated water center tube is parallel to the first width C, the first length C is sealed and has a second raw water inlet, and the second raw water inlet is far away from the first width C; The second concentrated water central pipe is not connected to the water production surface; The second concentrated water center tube is provided with S3 strips, and they correspond to the flushing membranes one by one; when the concentrated water membrane, the water inlet membrane and the flushing membrane are unfolded, the first length A, the first length B and the first length C are located on the same side, the second length A, the second length B and the second length C are located on the same side, the first width A, the first width B and the first width C are located on the same side, and the second width A, the second width B and the second width C are located on the same side; the water production surface of the water inlet membrane is provided with a first sealing device along the second width A, the first length A and the second length A, and the sealing device is respectively sealed and connected with the corresponding positions of the flushing membrane, the water inlet membrane or the concentrated water membrane adjacent to the water inlet membrane, so as to form a first pure water cavity structure with the first width A as the outlet; A second sealing device is provided along the second width B, the first length B and the second length B of the concentrated water membrane, and the sealing device is respectively sealed and connected with the corresponding positions of the flushing membrane, the inlet membrane or the concentrated water membrane adjacent to the inlet membrane, so as to form a second pure water chamber structure with the first width B as the outlet; A third sealing device is provided along the second width C, the first length C and the second length C of the water production surface of the flushing membrane. The sealing device is respectively sealed and connected to the corresponding positions of the flushing membrane, the water inlet membrane or the concentrated water membrane adjacent to the water inlet membrane, so as to form a third pure water chamber structure with the first width C as the outlet; The first width A, the first width B and the first width C are respectively offset against the pure water central tube; In the operating condition, raw water enters the water inlet membrane from the first raw water inlet, and the raw water is reverse osmotic through the water inlet membrane to obtain pure water A1 and concentrated water A1, pure water A1 enters the first pure water cavity structure and is discharged from the integrated reverse osmosis filter element through the pure water center tube, concentrated water A1 flows out through the concentrated water outlet and turns to flow into the concentrated water inlet, and then concentrated water A1 enters the concentrated water membrane, concentrated water A1 is reverse osmotic through the concentrated water membrane to obtain pure water A2 and concentrated water A2, pure water A2 enters the second pure water cavity structure and is discharged from the integrated reverse osmosis filter element through the pure water center tube, and concentrated water A2 is discharged from the integrated reverse osmosis filter element through the first concentrated water center tube; During the flushing condition, the pure water center tube is blocked, and the raw water enters the flushing membrane from the second raw water inlet. The raw water is reversely osmotic through the flushing membrane to obtain pure water B and concentrated water B. Pure water B enters the third pure water chamber structure and is reversely flushed from the water production surface to the water inlet surface. Finally, pure water B is discharged from the integrated reverse osmosis filter element from the first raw water inlet, and concentrated water B is discharged from the integrated reverse osmosis filter element through the second concentrated water center tube.

2. The integrated reverse osmosis filter element according to claim 1, characterized in that: An integrated reverse osmosis filter element is provided for the inlet membrane, the concentrate membrane and the flushing membrane, which are wound around the first concentrate central tube, the second concentrate central tube and the pure water central tube; An upper end cover is also provided for diverting concentrated water A1 from the concentrated water outlet to the concentrated water inlet. The upper end cover is sealed and assembled on the water inlet membrane, concentrated water membrane and flushing membrane and is located on the first long A side. The lower end cover is sealed and assembled on the water inlet membrane, concentrated water membrane and flushing membrane and is located on the second long A side.

3. A filtering system, characterized in that: A reverse osmosis filter element as claimed in any one of claims 1 to 2.

Images