A filtering device

Abstract

The present invention relates to a filtering device, belonging to the field of sewage treatment. It comprises: an activated carbon filtering mechanism, a plurality of reverse osmosis membrane filtering mechanisms, a sewage inlet pipe, a clean water outlet pipe, a shell, a bottom cover, a baffle, a nut and a sewage outlet; the sewage outlet is arranged on the bottom cover, the sewage inlet pipe passes through the top of the shell, the baffle is arranged on the inner wall of the shell, the activated carbon filtering mechanism is arranged above the baffle, a plurality of reverse osmosis membrane filtering mechanisms are coaxially arranged between the baffle and the bottom cover, the reverse osmosis membrane filtering mechanism is connected to the inner wall of the shell, the clean water outlet pipe is connected to a plurality of reverse osmosis membrane filtering mechanisms, the bottom end of the clean water outlet pipe passes through the bottom cover, the nut is threadedly connected to the outer wall of the bottom end of the clean water outlet pipe, and abuts against the bottom cover. The present invention reduces the construction and use costs of the filtering equipment, and improves the sewage filtering effect and the service life of the filtering membrane.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a filtering device. Background Art

[0002] With the continuous advancement of industrialization and the deepening of environmental protection concepts, sewage or wastewater generated in industrial production must be reasonably treated before being discharged into the natural environment. Traditional sewage treatment often uses disc filters for front-end pretreatment, and injects the pretreated sewage into membrane filters for further filtration. However, the disc filter has uneven filtration accuracy for water and cannot perform deep treatment of sewage. The filter membrane assembly in the membrane filter can only encapsulate a single type of filter membrane, and the filter membrane assembly cannot be recycled. In addition, the front-end pretreatment mechanism and the membrane deep treatment mechanism must be built separately, and the mechanisms are connected by pipes. This not only leads to a large footprint of sewage treatment equipment, but also the fluctuation of water pressure during sewage transmission will cause accidents such as filter membrane breakdown, reducing the service life of the filter membrane. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a filtering device which integrates a sewage front-end pretreatment mechanism and a deep treatment mechanism, reduces the equipment footprint, and improves the service life of the filtering membrane and the sewage treatment quality.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a filtering device comprises: an activated carbon filtering mechanism, a plurality of reverse osmosis membrane filtering mechanisms, a sewage inlet pipe, a clean water outlet pipe, an outer shell, a bottom cover, a baffle, a nut and a sewage outlet; the outer shell is a hollow shell structure with an open bottom end, the bottom cover is a plate-shaped structure connected to the bottom end of the outer shell, the sewage outlet is a through hole arranged on the bottom cover, the sewage inlet pipe passes through the top end of the outer shell, the baffle is an annular plate-shaped structure arranged on the inner wall of the outer shell, the activated carbon filtering mechanism is arranged above the baffle, a plurality of reverse osmosis membrane filtering mechanisms are coaxially arranged between the baffle and the bottom cover, the reverse osmosis membrane filtering mechanism is connected to the inner wall of the outer shell, the clean water outlet pipe is connected to the plurality of reverse osmosis membrane filtering mechanisms, the bottom end of the clean water outlet pipe passes through the bottom cover, the nut is threadedly connected to the outer wall of the bottom end of the clean water outlet pipe, and abuts against the bottom cover.

[0005] The beneficial effects of the present invention are as follows: by arranging an activated carbon filtering mechanism and a plurality of reverse osmosis membrane filtering mechanisms in one housing at the same time, the floor space and construction cost of the sewage filtering equipment are reduced; at the same time, after the sewage is pre-treated at the front end by the activated carbon filtering mechanism, the coaxial arrangement of the plurality of reverse osmosis membrane filtering mechanisms up and down is conducive to multiple filtration of the sewage, which can improve the sewage filtering effect while preventing the reverse osmosis membrane from being punctured by high-pressure sewage, thereby increasing the service life of the filtering membrane; in addition, the reverse osmosis membrane in the reverse osmosis membrane filtering mechanism can be disassembled, replaced and recycled, thereby reducing the use cost.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the activated carbon filtering mechanism includes: a baffle, a plurality of steel bars, activated carbon and a filter screen, the steel bars and the baffle are vertically connected, the filter screen is arranged below the baffle and connected to the inner wall of the outer shell, and the activated carbon is arranged in the space formed by the plurality of steel bars, the space formed by the steel bars and the baffle, and the space formed by the baffle and the filter screen.

[0008] The beneficial effect of adopting the above further scheme is that the activated carbon filtration mechanism is conducive to the front-end pretreatment of sewage and the preliminary filtration of larger impurities in the sewage. The baffles and steel bars are conducive to allowing the sewage to pass through activated carbon filtration of different particle sizes in different spaces in turn, thereby improving the filtration effect of the front-end pretreatment.

[0009] Furthermore, the baffle is an inverted arched plate structure, and the height of the steel bar is lower than the height of the baffle.

[0010] The beneficial effect of adopting the above further scheme is that the setting of the steel bar height is conducive to the sewage being filtered by the corresponding activated carbon in the space formed by multiple steel bars and then overflowing into the space formed by the steel bars and baffles and then filtered by the corresponding activated carbon.

[0011] Furthermore, the sewage inlet pipe is a tubular structure with its bottom end arranged above the space formed by the plurality of steel bars.

[0012] The beneficial effect of adopting the above further scheme is that the sewage inlet pipe is conducive to sending pressurized sewage into the filtering device, and being arranged above the space formed by multiple steel bars is conducive to directly injecting the sewage entering the filtering device into the space formed by multiple steel bars for initial filtration.

[0013] Furthermore, the reverse osmosis membrane filtration mechanism includes a permeation shell, a first sewage flow channel and a second sealing ring, the permeation shell is an annular shell structure with an open top, the outer wall of the permeation shell and the inner wall of the outer shell are fixedly connected by the second sealing ring, the first sewage flow channel is an L-shaped through hole, and the two ends of the first sewage flow channel are arranged one-to-one on the inner wall and bottom of the permeation shell.

[0014] The beneficial effect of adopting the above further scheme is: the osmosis shell cooperates with the second sealing ring to prevent sewage from flowing into the next-level reverse osmosis membrane filtration mechanism from the gap between the osmosis shell and the outer shell without passing through the previous-level osmosis filtration, and the first sewage flow channel is conducive to sending part of the sewage to the next-level reverse osmosis membrane filtration mechanism when the sewage pressure is too high, thereby avoiding the reverse osmosis membrane from being punctured and damaged by high-pressure sewage, and increasing the service life of the reverse osmosis membrane.

[0015] Furthermore, the reverse osmosis membrane filtration mechanism also includes: an upper pressure plate, a reverse osmosis membrane, a lower pressure plate, multiple springs and a first sealing ring. The upper pressure plate and the lower pressure plate are plate-like structures arranged in a one-to-one correspondence at the upper and lower ends of the reverse osmosis membrane. The first sealing ring is arranged on the outer wall of the lower pressure plate and is slidably connected to the inner wall of the permeation shell. The upper and lower ends of the spring are connected in a one-to-one correspondence to the bottom end of the lower pressure plate and the inner wall of the bottom end of the permeation shell. When the spring is at an initial length, the first sealing ring is located above the first sewage flow channel arranged on the inner wall of the permeation shell.

[0016] The beneficial effects of adopting the above further scheme are: the reverse osmosis membrane is conducive to filtering high-pressure sewage, and the upper pressure plate and the lower pressure plate are conducive to providing a channel for sewage to flow through the reverse osmosis membrane on the one hand, and are conducive to disassembly and replacement of the reverse osmosis membrane on the other hand, thereby reducing the cost of use; the first sealing ring is conducive to preventing sewage from flowing into the clean water outlet pipe without being filtered by the reverse osmosis membrane filtration mechanism, resulting in contamination of the filtered clean water; the spring is conducive to receiving the upper pressure plate, reverse osmosis membrane and lower pressure plate moving downward when the sewage pressure is too high, and restoring the initial state after the high-pressure sewage flows from the first sewage flow channel into the next-level reverse osmosis membrane filtration mechanism.

[0017] Furthermore, a plurality of second sewage flow channels are provided on the upper pressing plate and the lower pressing plate, and the second sewage flow channels are through holes.

[0018] The beneficial effect of adopting the above further solution is that the second sewage flow channel provided on the upper pressure plate and the lower pressure plate is conducive to providing a channel for sewage to flow into and out of the reverse osmosis membrane.

[0019] Furthermore, the clean water outlet pipe is a tubular structure, the top end of the clean water outlet pipe is connected through the bottom end of the permeation shell in the topmost reverse osmosis membrane filtration mechanism, and the middle part of the clean water outlet pipe passes through the upper pressure plate, reverse osmosis membrane, lower pressure plate and the bottom end of the permeation shell in the remaining reverse osmosis membrane filtration mechanisms.

[0020] The beneficial effect of adopting the above further scheme is that connecting multiple reverse osmosis membrane filtration mechanisms in series to the purified water outlet pipe is conducive to outputting purified water filtered by multiple reverse osmosis membrane filtration mechanisms to the filtration device.

[0021] Furthermore, a plurality of water purification holes are arranged on the side wall of the clean water outlet pipe, and the water purification holes are through holes. The plurality of water purification holes are arranged one by one above the inner wall of the bottom end of the osmosis shell in the plurality of reverse osmosis membrane filtration mechanisms connected to the middle of the clean water outlet pipe.

[0022] The beneficial effect of adopting the above further scheme is that the clean water hole is conducive to the clean water obtained by filtration from the osmosis shell into the clean water outlet pipe and output from the filtration device after the sewage is filtered by other reverse osmosis membrane filtration mechanisms except the top reverse osmosis membrane filtration mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A cross-sectional view of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the flow of sewage and clean water during sewage filtration provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of an upper pressing plate or a lower pressing plate provided in an embodiment of the present invention.

[0026] in, Figure 2 The arrows in the figure represent the flow direction of sewage and clean water.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Activated carbon filtering mechanism; 2. Reverse osmosis membrane filtering mechanism; 3. Sewage inlet pipe; 4. Clean water outlet pipe; 5. Outer shell; 6. Bottom cover; 7. Baffle; 8. Nut; 9. Sewage outlet; 11. Baffle; 12. Steel bar; 13. Activated carbon; 14. Filter screen; 21. Upper pressure plate; 22. Reverse osmosis membrane; 23. Lower pressure plate; 24. Spring; 25. Osmosis shell; 26. First sewage flow channel; 27. First sealing ring; 28. Second sealing ring; 29. ​​Second sewage flow channel; 41. Clean water hole. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] like Figure 1 and Figure 2As shown, a filtering device comprises: an activated carbon filtering mechanism 1, a plurality of reverse osmosis membrane filtering mechanisms 2, a sewage inlet pipe 3, a clean water outlet pipe 4, a shell 5, a bottom cover 6, a baffle 7, a nut 8 and a sewage outlet 9; the shell 5 is a hollow shell structure with an open bottom end, the bottom cover 6 is a plate-like structure connected to the bottom end of the shell 5, the sewage outlet 9 is a through hole arranged on the bottom cover 6, the sewage inlet pipe 3 passes through the top of the shell 5, the baffle 7 is an annular plate-like structure arranged on the inner wall of the shell 5, the activated carbon filtering mechanism 1 is arranged above the baffle 7, a plurality of the reverse osmosis membrane filtering mechanisms 2 are coaxially arranged between the baffle 7 and the bottom cover 6, the reverse osmosis membrane filtering mechanism 2 is connected to the inner wall of the shell 5, the clean water outlet pipe 4 is connected to the plurality of the reverse osmosis membrane filtering mechanisms 2, the bottom end of the clean water outlet pipe 4 passes through the bottom cover 6, the nut 8 is threadedly connected to the outer wall of the bottom end of the clean water outlet pipe 4, and abuts against the bottom cover 6.

[0031] It should be noted that: the bottom cover 6 and the bottom end of the housing 5 must be sealed and connected, so that the sewage filtered from the bottommost reverse osmosis membrane filter mechanism 2 can be prevented from leaking from the connection gap between the bottom cover 6 and the bottom end of the housing 5. At the same time, in the technical solution of the present invention, the sewage needs to be pressurized to a certain range (2.4 to 4.5 MPa) before entering the filter device through the sewage inlet pipe 3, because in the technical solution of the present invention, the reverse osmosis membrane 22 is used to filter the sewage in the reverse osmosis membrane filter mechanism 2, and the working principle of the reverse osmosis membrane is to filter under a certain pressure, so pressurizing the sewage is conducive to the sewage passing through multiple reverse osmosis membrane filter mechanisms 2 under pressure, and the number of reverse osmosis membrane filter mechanisms 2 selected by the filter device needs to be determined according to the pressure value of the sewage after being pressurized, to ensure that the sewage can be filtered through all the reverse osmosis membrane filter mechanisms 2.

[0032] The beneficial effects of the present invention are as follows: by arranging an activated carbon filtering mechanism and a plurality of reverse osmosis membrane filtering mechanisms in one housing at the same time, the floor space and construction cost of the sewage filtering equipment are reduced; at the same time, after the sewage is pre-treated at the front end by the activated carbon filtering mechanism, the coaxial arrangement of the plurality of reverse osmosis membrane filtering mechanisms up and down is conducive to multiple filtration of the sewage, which can improve the sewage filtering effect while preventing the reverse osmosis membrane from being punctured by high-pressure sewage, thereby increasing the service life of the filtering membrane; in addition, the reverse osmosis membrane in the reverse osmosis membrane filtering mechanism can be disassembled, replaced and recycled, thereby reducing the use cost.

[0033] Preferably, Figure 1 and Figure 2As shown, the activated carbon filtering mechanism 1 includes: a baffle 11, a plurality of steel bars 12, activated carbon 13 and a filter screen 14, the steel bars 12 and the baffle 11 are vertically connected, the filter screen 14 is arranged below the baffle 11 and connected to the inner wall of the outer shell 5, and the activated carbon 13 is arranged in the space formed by the plurality of steel bars 12, the space formed by the steel bars 12 and the baffle 11, and the space formed by the baffle 11 and the filter screen 14.

[0034] It should be noted that: in a preferred embodiment of the present invention, the activated carbon 13 has two sizes. The particle size of the activated carbon 13 set in the space formed by the multiple steel bars 12 and the space formed by the steel bars 12 and the baffle 11 is 2-3mm, and the particle size of the activated carbon 13 set in the space formed by the baffle 11 and the filter 14 is 3-5mm; the gap between the multiple steel bars 12 is less than 2mm, and the diameter of the hole of the filter 14 is less than 2mm. The above-mentioned size setting is conducive to preventing the activated carbon 13 from leaking out from the gaps between the multiple steel bars 12 and the holes of the filter 14, and is also conducive to using the activated carbon 13 of different particle sizes to filter sewage multiple times according to the characteristics of the baffle.

[0035] The beneficial effects of adopting the above-mentioned preferred scheme are: the activated carbon filtration mechanism is conducive to the front-end pretreatment of sewage and the preliminary filtration of larger impurities in the sewage, wherein the baffles and steel bars are conducive to allowing the sewage to pass through activated carbon filtration of different particle sizes in different spaces in turn, thereby improving the filtration effect of the front-end pretreatment.

[0036] Preferably, Figure 1 and Figure 2 As shown, the baffle 11 is an inverted arched plate structure, and the height of the steel bar 12 is lower than the height of the baffle 11 .

[0037] It should be noted that the height of the steel bar 12 is 20%-40% of the height of the baffle 11 , which is conducive to allowing sewage to overflow from the space formed by the plurality of steel bars 12 into the space formed by the baffle 11 and the steel bar 12 .

[0038] The beneficial effect of adopting the above preferred scheme is that the setting of the steel bar height is conducive to the sewage being filtered by the corresponding activated carbon in the space formed by multiple steel bars and then overflowing into the space formed by the steel bars and baffles and then filtered by the corresponding activated carbon.

[0039] Preferably, Figure 1 and Figure 2 As shown, the sewage inlet pipe 3 is a tubular structure with its bottom end arranged above the space formed by the plurality of steel bars 12 .

[0040] The beneficial effect of adopting the above preferred scheme is that the sewage inlet pipe is conducive to sending pressurized sewage into the filtering device, and being arranged above the space formed by multiple steel bars is conducive to directly injecting the sewage entering the filtering device into the space formed by multiple steel bars for initial filtration.

[0041] Preferably, Figure 1 and Figure 2 As shown, the reverse osmosis membrane filtration mechanism 2 includes a permeation shell 25, a first sewage flow channel 26 and a second sealing ring 28. The permeation shell 25 is an annular shell structure with an open top. The outer wall of the permeation shell 25 and the inner wall of the outer shell 5 are fixedly connected by the second sealing ring 28. The first sewage flow channel 26 is an L-shaped through hole, and the two ends of the first sewage flow channel 26 are arranged on the inner wall and the bottom of the permeation shell 25 in a one-to-one correspondence.

[0042] The beneficial effects of adopting the above-mentioned preferred scheme are: the cooperation of the permeation shell with the second sealing ring is conducive to preventing sewage from flowing into the next-stage reverse osmosis membrane filtration mechanism from the gap between the permeation shell and the outer shell without passing through the previous-stage osmosis filtration, and the first sewage flow channel is conducive to sending part of the sewage to the next-stage reverse osmosis membrane filtration mechanism when the sewage pressure is too high, thereby avoiding the reverse osmosis membrane from being punctured and damaged by high-pressure sewage, and increasing the service life of the reverse osmosis membrane.

[0043] Preferably, Figure 1 and Figure 2 As shown, the reverse osmosis membrane filtration mechanism 2 also includes: an upper pressure plate 21, a reverse osmosis membrane 22, a lower pressure plate 23, a plurality of springs 24 and a first sealing ring 27. The upper pressure plate 21 and the lower pressure plate 23 are plate-like structures arranged one-to-one at the upper and lower ends of the reverse osmosis membrane 22. The first sealing ring 27 is arranged on the outer wall of the lower pressure plate 23 and is slidably connected to the inner wall of the permeate shell 25. The upper and lower ends of the spring 24 are connected one-to-one to the bottom end of the lower pressure plate 23 and the inner wall of the bottom end of the permeate shell 25. When the spring 24 is at its initial length, the first sealing ring 27 is located above the first sewage flow channel 26 arranged on the inner wall of the permeate shell 25.

[0044] The beneficial effects of adopting the above-mentioned preferred scheme are as follows: the reverse osmosis membrane is conducive to filtering high-pressure sewage. The upper pressure plate and the lower pressure plate are conducive to providing a channel for sewage to flow through the reverse osmosis membrane on the one hand, and are conducive to disassembly and replacement of the reverse osmosis membrane on the other hand, thereby reducing the cost of use; the first sealing ring is conducive to preventing sewage from flowing into the clean water outlet pipe without being filtered by the reverse osmosis membrane filtration mechanism, resulting in contamination of the filtered clean water; the spring is conducive to receiving the upper pressure plate, reverse osmosis membrane and lower pressure plate moving downward when the sewage pressure is too high, and restoring the initial state after the high-pressure sewage flows from the first sewage flow channel into the next-level reverse osmosis membrane filtration mechanism.

[0045] Preferably, Figure 3 As shown, a plurality of second sewage flow channels 29 are provided on the upper pressing plate 21 and the lower pressing plate 23, and the second sewage flow channels 29 are through holes.

[0046] The beneficial effect of adopting the above preferred solution is that the second sewage flow channel arranged on the upper pressure plate and the lower pressure plate is conducive to providing a channel for sewage to flow into and out of the reverse osmosis membrane.

[0047] Preferably, Figure 1 and Figure 2 As shown, the clean water outlet pipe 4 is a tubular structure, the top end of the clean water outlet pipe 4 is connected through the bottom end of the permeation shell 25 in the topmost reverse osmosis membrane filtration mechanism 2, and the middle part of the clean water outlet pipe 4 passes through the upper pressure plate 21, reverse osmosis membrane 22, lower pressure plate 23 and the bottom end of the permeation shell 25 in the remaining reverse osmosis membrane filtration mechanisms 2.

[0048] The beneficial effect of adopting the above preferred solution is that connecting multiple reverse osmosis membrane filtration mechanisms in series to the purified water outlet pipe is conducive to outputting purified water filtered by multiple reverse osmosis membrane filtration mechanisms to the filtration device.

[0049] Preferably, Figure 1 and Figure 2 As shown, a plurality of clean water holes 41 are arranged on the side wall of the clean water outlet pipe 4, and the clean water holes 41 are through holes. The plurality of clean water holes 41 are arranged one by one above the inner wall of the bottom end of the permeation shell 25 in the plurality of reverse osmosis membrane filtration mechanisms 2 connected to the middle of the clean water outlet pipe 4.

[0050] The beneficial effect of adopting the above preferred scheme is that the clean water hole is conducive to the clean water obtained by filtration from the osmosis shell into the clean water outlet pipe and output from the filtration device after the sewage is filtered by other reverse osmosis membrane filtration mechanisms except the top reverse osmosis membrane filtration mechanism.

[0051] The working process of the present invention is described below by an embodiment:

[0052] like Figures 1 to 3As shown, when it is necessary to filter the sewage, the sewage is first pressurized and then injected into the filter device through the sewage inlet pipe 3. At this time, the sewage enters the space formed by multiple steel bars 12. In this space, the activated carbon 13 first filters the sewage; as the sewage continues to enter, the sewage after the first filtration overflows from the space formed by multiple steel bars 12 to the space formed by the steel bars 12 and the baffles 11. In this space, the activated carbon 13 performs a second filtration on the sewage; as the sewage continues to enter, the sewage after the second filtration overflows from the space formed by the steel bars 12 and the baffles 11 to the space formed by the baffles 11 and the filter 14. In this space, the activated carbon 13 performs a third filtration on the sewage. At this point, the sewage is pre-treated by the front end of the activated carbon filter mechanism 1, and the large particle impurities in the sewage are filtered out under the action of the activated carbon 13 and the filter 14 of different particle sizes.

[0053] After being filtered by the activated carbon filter mechanism 1, the sewage flows into the top reverse osmosis membrane filter mechanism 2 (for ease of understanding, the top reverse osmosis membrane filter mechanism 2 is called the first-level reverse osmosis membrane filter mechanism 2, and the reverse osmosis membrane filter mechanism 2 below the top reverse osmosis membrane filter mechanism 2 is called the second-level reverse osmosis membrane filter mechanism 2, the third-level reverse osmosis membrane filter mechanism 2, etc.) At this time, since the sewage to be treated is in a high-pressure state, a small part of the sewage will flow into the reverse osmosis membrane 22 through the second sewage flow channel 29 on the upper pressure plate 21, and after being filtered by the reverse osmosis membrane 22, it will flow into the permeation shell 25 from the second sewage flow channel 29 on the lower pressure plate 23, and then enter the clean water outlet pipe 4 to flow out of the filtration device. Most of the sewage will press the upper pressure plate 21, the reverse osmosis membrane 22 and the lower pressure plate 23 downward under the action of high pressure, so that the first sealing ring 27 is lower than the position of the first sewage flow channel 26 on the inner wall of the permeation shell 25. At this time, the sewage will flow out of the first reverse osmosis membrane filter mechanism 2 from the first sewage flow channel 26 and enter the second reverse osmosis membrane filter mechanism 2. The sewage pressure reaching the secondary reverse osmosis membrane filtration mechanism 2 will be reduced. Similarly, a small part of the sewage will enter the inside of the permeation shell 25 after being filtered by the reverse osmosis membrane 22 in the secondary reverse osmosis membrane filtration mechanism 2 and flow into the clean water outlet pipe 4 through the clean water hole 41. Most of the sewage will flow into the next-level reverse osmosis membrane filtration mechanism 2 through the first sewage flow channel 26 in the secondary reverse osmosis membrane filtration mechanism 2, and the sewage pressure reaching the next-level reverse osmosis membrane filtration mechanism 2 will be further reduced. When the sewage reaches the last-level reverse osmosis membrane filtration mechanism 2, the sewage water pressure at this time can just press the upper pressure plate 21, the reverse osmosis membrane 22 and the lower pressure plate 23 downward to make the first sealing ring 27 lower than the position of the first sewage flow channel 26 on the inner wall of the permeation shell 25. At this time, all the sewage will flow out of the last-level reverse osmosis membrane filtration mechanism 2 through the first sewage flow channel 26 and flow out of the filtration device from the sewage outlet 9, and the filtered clean water will flow into the clean water outlet pipe 4 through multiple clean water holes 41 and flow out of the filtration device along the clean water outlet pipe 4.

[0054] At this point, the sewage filtration is completed. The pressure value for pressurizing the sewage before entering the filtration device needs to be selected according to the sewage type and process requirements, thereby determining the number of reverse osmosis membrane filtration mechanisms 2 to be installed.

[0055] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A filtering device, It is characterized in that include: An activated carbon filtering mechanism (1), a plurality of reverse osmosis membrane filtering mechanisms (2), a sewage inlet pipe (3), a purified water outlet pipe (4), a housing (5), a bottom cover (6), a baffle (7), a nut (8) and a sewage outlet (9); The shell (5) is a hollow shell structure with an open bottom end; the bottom cover (6) is a plate-like structure connected to the bottom end of the shell (5); the sewage outlet (9) is a through hole arranged on the bottom cover (6); the sewage inlet pipe (3) passes through the top end of the shell (5); the baffle (7) is an annular plate-like structure arranged on the inner wall of the shell (5); the activated carbon filtering mechanism (1) is arranged above the baffle (7); a plurality of reverse osmosis membrane filtering mechanisms (2) are coaxially arranged up and down between the baffle (7) and the bottom cover (6); the reverse osmosis membrane filtering mechanism (2) is connected to the inner wall of the shell (5); the clean water outlet pipe (4) is connected to the plurality of reverse osmosis membrane filtering mechanisms (2); the bottom end of the clean water outlet pipe (4) passes through the bottom cover (6); the nut (8) is threadedly connected to the outer wall of the bottom end of the clean water outlet pipe (4) and abuts against the bottom cover (6); The reverse osmosis membrane filtration mechanism (2) comprises a permeation shell (25), a first sewage flow channel (26) and a second sealing ring (28); the permeation shell (25) is an annular shell structure with an open top; the outer wall of the permeation shell (25) and the inner wall of the outer shell (5) are fixedly connected via the second sealing ring (28); the first sewage flow channel (26) is an L-shaped through hole; and the two ends of the first sewage flow channel (26) are arranged on the inner wall and the bottom of the permeation shell (25) in a one-to-one correspondence; The reverse osmosis membrane filtration mechanism (2) further comprises: an upper pressure plate (21), a reverse osmosis membrane (22), a lower pressure plate (23), a plurality of springs (24) and a first sealing ring (27); the upper pressure plate (21) and the lower pressure plate (23) are plate-like structures arranged one-to-one at the upper and lower ends of the reverse osmosis membrane (22); the first sealing ring (27) is arranged on the outer wall of the lower pressure plate (23) and is slidably connected to the inner wall of the permeation shell (25); the upper and lower ends of the spring (24) are connected one-to-one to the bottom end of the lower pressure plate (23) and the inner wall of the bottom end of the permeation shell (25); when the spring (24) is at an initial length, the first sealing ring (27) is located above the first sewage flow channel (26) arranged on the inner wall of the permeation shell (25).

2. A filtering device according to claim 1, It is characterized in that The activated carbon filtering mechanism (1) comprises: a baffle (11), a plurality of steel bars (12), activated carbon (13) and a filter screen (14); the steel bars (12) and the baffle (11) are vertically connected; the filter screen (14) is arranged below the baffle (11) and connected to the inner wall of the housing (5); the activated carbon (13) is arranged in a space formed by the plurality of steel bars (12), a space formed by the steel bars (12) and the baffle (11), and a space formed by the baffle (11) and the filter screen (14).

3. A filtering device according to claim 2, It is characterized in that The baffle (11) is an inverted arched plate structure, and the height of the steel bar (12) is lower than the height of the baffle (11).

4. A filtering device according to claim 2, It is characterized in that The sewage inlet pipe (3) is a tubular structure with its bottom end arranged above the space formed by the plurality of steel bars (12).

5. A filtering device according to claim 1, It is characterized in that A plurality of second sewage flow channels (29) are provided on the upper pressing plate (21) and the lower pressing plate (23), and the second sewage flow channels (29) are through holes.

6. A filtering device according to claim 1, It is characterized in that The clean water outlet pipe (4) is a tubular structure, the top end of the clean water outlet pipe (4) is connected to the bottom end of the permeation shell (25) in the uppermost reverse osmosis membrane filtration mechanism (2), and the middle part of the clean water outlet pipe (4) is connected to the upper pressure plate (21), the reverse osmosis membrane (22), the lower pressure plate (23) and the bottom end of the permeation shell (25) in the remaining reverse osmosis membrane filtration mechanisms (2).

7. A filtering device according to claim 1, It is characterized in that A plurality of water purification holes (41) are arranged on the side wall of the water purification outlet pipe (4), and the water purification holes (41) are through holes. The plurality of water purification holes (41) are arranged one by one on the upper inner wall of the bottom end of the permeation shell (25) in the plurality of reverse osmosis membrane filtration mechanisms (2) connected to the middle of the water purification outlet pipe (4).

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