CN112897725A - Filtering system and filtering device - Google Patents

Abstract

The invention relates to a filtering system and a filtering device. Ceramic filter layer, active carbon filter layer and receive filter membrane and set gradually, and there is first buffering space ceramic filter layer deviates from one side of active carbon filter layer, and first buffering space is used for being linked together with the inlet tube. The ceramic filter layer is integrated sintered ceramic, the uniformity of filter pore diameter is good, the ceramic filter layer is fixed, disordered layers cannot be caused by installation or backwashing process, the cleaning process of the ceramic filter layer is simple, compressed air can be used for mixing and backwashing, the ceramic filter layer is convenient to integrally replace at one time, the weight is small, layered filling is not needed, and the operation cost can be greatly reduced and the maintenance work can be conveniently carried out. In addition, compared with the traditional softener, the nanofiltration membrane is made of polyamide materials, the processing technology is better than the filling material filling uniformity, and the nanofiltration membrane does not need a sodium chloride regeneration technology, so that the operation cost and the environmental pollution pressure are reduced.

Description

Filtering system and filtering device

Technical Field

The invention relates to the technical field of purified water preparation, in particular to a filtering system and a filtering device.

Background

Traditionally, in the purified water preparation technology, the front-stage pre-filtration treatment device is generally used for removing suspended matters, colloid, residual chlorine, salts and other substances in raw water, and the water after filtration treatment is sent into a reverse osmosis membrane system for further filtration treatment, and is further filtered by the reverse osmosis membrane system to obtain purified water. The pre-filtering treatment device in the front stage of purified water preparation usually includes, for example, a multi-media filter, an activated carbon filter and a softener, and the three filters are connected in series in sequence to pre-filter raw water. Wherein, multi-media filter belongs to pressure filter, through the manual not filler of equidimension of adding in the scene in order to pile up and form the filter layer, and the filter layer packing homogeneity is poor, the filter effect depends on the complete degree that the filter layer was filled, multi-media filter needs the backwash regularly simultaneously, improper control of backwash intensity can lead to filling indiscriminate layer, finally influence the filter effect, on the other hand, because the filler mainly is heavier materials such as quartz sand, cobblestone, it is relatively complicated when filling and changing, make running cost high and maintain complicacy. In addition, the interior of the softener is filled with Na-type cation resin to replace divalent salt ions such as Ca2+, Mg2+ and the like in raw water so as to prevent the divalent salt from scaling in the back-end reverse osmosis process, however, the Na-type cation resin in the softener needs to be regenerated by periodically using sodium chloride, so that a large amount of sodium chloride is consumed in regeneration, and a large amount of sewage is generated, so that the operation cost is high and the maintenance is complicated.

Disclosure of Invention

In view of the foregoing, there is a need to overcome the shortcomings of the prior art and to provide a filtration system and filtration apparatus that reduces the cost of operation and facilitates maintenance.

The technical scheme is as follows: a filter device, the filter device comprising: ceramic filter layer, active carbon filter layer and receive the filter membrane, ceramic filter layer active carbon filter layer with receive the filter membrane and set gradually, ceramic filter layer deviate from in one side of active carbon filter layer has first buffering space, ceramic filter layer sintering pottery as an organic whole, first buffering space is used for being linked together with the inlet tube, ceramic filter layer towards one side of active carbon filter layer with there is second buffering space between the active carbon filter layer, the active carbon filter layer with receive and be equipped with third buffering space between the filter membrane.

When the filter device is used, raw water enters the first buffer space through the water inlet pipe, the ceramic filter layer filters large-particle suspended matters in the raw water and then enters the second buffer space, the active carbon filter layer filters residual chlorine and other organic matters in the raw water and then enters the third buffer space, the nanofiltration membrane filters divalent salt ions such as Ca2+, Mg2+ in the raw water and then enters the rear-end treatment process, and the divalent salt scaling of the rear-end reverse osmosis process can be prevented. Wherein, ceramic filter layer is integration sintered pottery, and it is good to filter the aperture homogeneity, and ceramic filter layer is fixed, can not lead to indiscriminate layer because of installation or backwash technology, and ceramic filter layer cleaning process is simple, can use compressed air to mix the backwash, and ceramic filter layer is convenient for the whole disposable change of being convenient for simultaneously, and weight is less, and does not need the layering to fill, can greatly reduced running cost with be convenient for carry out maintenance work. In addition, compared with the traditional softener, the nanofiltration membrane is made of polyamide materials, the processing technology is better in filling uniformity and better in long-term operation stability compared with the filler, and the nanofiltration membrane does not need a sodium chloride regeneration technology, so that the operation cost and the environmental pollution pressure are reduced.

In one embodiment, the filter device further comprises a PTFE filter layer arranged between the activated carbon filter layer and the nanofiltration membrane; the PTFE filter layer is of an integrated sintering structure; the PTFE filter layer divides the third buffer space into a fourth buffer space and a fifth buffer space.

In one embodiment, the activated carbon filter layer is an integrated sintered activated carbon structure.

In one embodiment, the filtering precision of the ceramic filtering layer is 8-15 um; the filtering precision of the PTFE filtering layer is 3um-5 um; the filtration precision of the nanofiltration membrane is not more than 1 nm.

In one embodiment, the filter device further comprises a housing, and the ceramic filter layer, the activated carbon filter layer and the PTFE filter layer are all sleeve-shaped; the ceramic filter layer is embedded in the shell, and the outer wall of the ceramic filter layer and the inner wall of the shell enclose the first buffer space; the active carbon filter layer is embedded in the ceramic filter layer, and the outer wall of the active carbon filter layer and the inner wall of the ceramic filter layer enclose the second buffer space; the PTFE filter layer is embedded in the activated carbon filter layer, and the outer wall of the PTFE filter layer and the inner wall of the activated carbon filter layer enclose the fourth buffer space; the nanofiltration membrane is embedded in the PTFE filter layer, the outer wall of the nanofiltration membrane and the inner wall of the PTFE filter layer are enclosed to form the fifth buffer space.

In one embodiment, the housing is provided with two opposite open ends, the filtering device further comprises two end cover plates which are respectively arranged at the two open ends in a one-to-one correspondence manner, and the end cover plates are in sealing contact with the open ends, the end parts of the ceramic filtering layer, the activated carbon filtering layer and the PTFE filtering layer.

In one embodiment, the inside of receiving the filter membrane is equipped with the core pipe, be equipped with the first hole that passes through of a plurality of on the pipe wall of core pipe, the one end of core pipe is connected with first calandria, first calandria runs through receive filter membrane and one of them the end cover board stretches out the outside of shell.

In one embodiment, the other end of the core pipe is connected with a second drain pipe, and the second drain pipe penetrates through the nanofiltration membrane and the other end cover plate and extends out of the shell.

In one embodiment, a sixth buffer space is formed between the end face of the nanofiltration membrane and the end cover plate at an interval, and the sixth buffer space is communicated with the fifth buffer space.

In one embodiment, the filter device further comprises a first mouthpiece and a second mouthpiece; the first interface tube and the second interface tube are respectively arranged on the two end cover plates, and the first interface tube and the second interface tube are communicated with the sixth buffer space.

In one embodiment, the end cover plate comprises a middle plate and a peripheral plate, and the peripheral plate is arranged around the periphery of the middle plate; the peripheral plate is respectively in sealing contact with the opening end, the end part of the ceramic filter layer, the end part of the activated carbon filter layer and the end part of the PTFE filter layer; the middle plate and the nanofiltration membrane are arranged at intervals, the middle plate is provided with a positioning piece, and the positioning piece is connected with the nanofiltration membrane.

In one embodiment, the filter device further comprises a support pipe embedded in the PTFE filter layer, a plurality of second through holes are formed in the pipe wall of the support pipe, and the outer wall of the support pipe is connected with the inner wall of the PTFE filter layer; the nanofiltration membrane is embedded in the supporting tube.

In one embodiment, the filter device further comprises a discharge pipe communicated with the first buffer space, the water inlet pipe is arranged on one of the end cover plates, and the discharge pipe is arranged on the other end cover plate.

A filtering system comprises the filtering device.

When the filter system is used, raw water enters the first buffer space through the water inlet pipe, the ceramic filter layer filters large-particle suspended matters in the raw water and then enters the second buffer space, the active carbon filter layer filters residual chlorine and other organic matters in the raw water and then enters the third buffer space, the nanofiltration membrane filters divalent salt ions such as Ca2+, Mg2+ in the raw water and then enters the rear-end treatment process, and the rear-end reverse osmosis process divalent salt scaling can be prevented. Wherein, ceramic filter layer is integration sintered pottery, and it is good to filter the aperture homogeneity, and ceramic filter layer is fixed, can not lead to indiscriminate layer because of installation or backwash technology, and ceramic filter layer cleaning process is simple, can use compressed air to mix the backwash, and ceramic filter layer is convenient for the whole disposable change of being convenient for simultaneously, and weight is less, and does not need the layering to fill, can greatly reduced running cost with be convenient for carry out maintenance work. In addition, compared with the traditional softener, the nanofiltration membrane is made of polyamide materials, the processing technology is better in filling uniformity and better in long-term operation stability compared with the filler, and the nanofiltration membrane does not need a sodium chloride regeneration technology, so that the operation cost and the environmental pollution pressure are reduced.

In one embodiment, the number of the filtering devices is more than two, and the more than two filtering devices are arranged in parallel.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a filtering apparatus according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

FIG. 3 is an enlarged schematic view of FIG. 1 at B;

FIG. 4 is an enlarged schematic view of FIG. 1 at C;

FIG. 5 is a top view of a filter assembly according to one embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a filter device according to another embodiment of the present invention;

fig. 7 is a schematic structural diagram of a filtering system according to an embodiment of the present invention.

10. A filtration device; 11. a ceramic filter layer; 12. an activated carbon filter layer; 13. a nanofiltration membrane; 141. a first buffer space; 142. a second buffer space; 143. a third buffer space; 144. a fourth buffer space; 145. a fifth buffer space; 146. a sixth buffer space; 151. a water inlet pipe; 152. a first drain pipe; 153. a second drain pipe; 154. a first interface tube; 155. a second mouthpiece; 156. a discharge pipe; 16. a PTFE filter layer; 17. a housing; 18. an end cover plate; 181. a middle plate; 1811. a positioning member; 182. a peripheral plate; 191. a first seal member; 192. a second seal member; 193. and (5) supporting the tube.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1, 2 and 5, fig. 1 shows a schematic structural diagram of a filter device 10 according to an embodiment of the present invention, fig. 2 shows an enlarged schematic structural diagram at a of fig. 1, and fig. 5 shows a top view of the filter device 10 according to an embodiment of the present invention. In an embodiment of the present invention, a filtering apparatus 10 includes a ceramic filtering layer 11, an activated carbon filtering layer 12, and a nanofiltration membrane 13. Ceramic filter layer 11, active carbon filter layer 12 and receive filter membrane 13 and set gradually, and there is first buffer space 141 ceramic filter layer 11 deviates from one side of active carbon filter layer 12, and first buffer space 141 is used for being linked together with inlet tube 151. The ceramic filter layer 11 is made of an integrated sintered ceramic, and a second buffer space 142 is formed between the side of the ceramic filter layer 11 facing the activated carbon filter layer 12 and the activated carbon filter layer 12. A third buffer space 143 is arranged between the activated carbon filter layer 12 and the nanofiltration membrane 13.

When the filtering device 10 is used, raw water enters the first buffering space 141 through the water inlet pipe 151, large-particle suspended matters in the raw water are filtered by the ceramic filtering layer 11 and then enter the second buffering space 142, residual chlorine and other organic matters in the raw water are filtered by the activated carbon filtering layer 12 and then enter the third buffering space 143, and then divalent salt ions such as Ca2+, Mg2+ in the raw water are filtered by the nanofiltration membrane 13 and then enter the rear-end treatment process, so that the divalent salt in the rear-end reverse osmosis process can be prevented from scaling. Wherein, ceramic filter layer 11 is integration sintered pottery, and it is good to filter the aperture homogeneity, and ceramic filter layer 11 is fixed, can not lead to indiscriminate layer because of installation or backwash technology, and ceramic filter layer 11 washs simple process, can use compressed air to mix the backwash, and ceramic filter layer 11 is convenient for the whole disposable change simultaneously, and weight is less, and does not need the layering to fill, can greatly reduced running cost with be convenient for maintain the work. In addition, the nanofiltration membrane 13 is made of polyamide materials compared with a traditional softener, the processing technology is better in filling uniformity and better in long-term operation stability compared with a filler, and the nanofiltration membrane 13 does not need a sodium chloride regeneration technology, so that the operation cost and the environmental pollution pressure are reduced.

Referring to fig. 1, 2 and 5, the filter device 10 further includes a PTFE (polytetrafluoroethylene) filter layer disposed between the activated carbon filter layer 12 and the nanofiltration membrane 13. The PTFE filter layer 16 is a unitary sintered structure. The PTFE filter layer 16 divides the third buffer space 143 into a fourth buffer space 144 and a fifth buffer space 145. So, enter into fourth buffer space 144 after filtering surplus chlorine and other organic matters in the former aquatic through active carbon filter layer 12, enter into fifth buffer space 145 after further filtering through PTFE filter layer 16 to the impurity such as the large granule suspended solid in the former aquatic, then carry out filtration treatment by receiving filter membrane 13 again, just so can guarantee the suspended particle in the former aquatic and filter completely as far as possible, can avoid receiving filter membrane 13 in the working process, impurity such as the suspended particle of not filtering is attached to receiving filter membrane 13 on the surface and is influenced and damage receiving filter membrane 13. In addition, the PTFE filter layer 16 is an integrated sintering structure, namely, the PTFE raw material is sintered at high temperature and high pressure, so that the PTFE filter layer has good filtering performance, and the conventional filtering precision is 0.1um to 30um, so that impurities such as suspended particles entering the raw water of the continuous process are reduced.

Generally speaking, in a traditional front-stage pre-filtration treatment device for purified water preparation, granular activated carbon is usually filled in a shell of an activated carbon filter, residual chlorine in water is adsorbed by activated carbon particles, the activated carbon particles are easy to breed microorganisms due to the special porous structure of the activated carbon particles, regular pasteurization is required, and the activated carbon particles are easy to break after repeated pasteurization to form fine activated carbon powder, so that rear-end process parts are polluted and blocked.

In one embodiment, the activated carbon filter layer 12 is a unitary sintered activated carbon structure. In this way, for example, activated carbon particles having a high iodine value (a high iodine value, for example, 2000 or more) are used, and after forming by bonding, they are baked at a high temperature to carbonize the binder and form micropores. For traditional activated carbon filter, the filter core main part 100% of integration sintering activated carbon structure is the activated carbon material, and its contact surface area is bigger, and the aperture is tortuous, and the pollutant carrying capacity is stronger, can filter former aquatic chlorine residue and other organic matters better, and the filter core tolerates many times pasteurization, can not produce the dirty stifled rear end technology of activated carbon powder, but the whole change does not need loaded down with trivial details packing, can greatly reduced running cost with be convenient for carry out maintenance work.

Of course, as an alternative, the activated carbon filter layer 12 may also be a conventional activated carbon filter, but the filtering effect, product performance, and assembly and maintenance difficulty of the activated carbon filter are all weaker than those of the integrated sintered activated carbon structure.

In one embodiment, the ceramic filter layer 11 has a filter fineness of 8um to 15 um; the filtering precision of the PTFE filtering layer 16 is 3um-5 um; the filtration precision of the nanofiltration membrane 13 is not more than 1 nm. Therefore, the filtering effect on raw water can be ensured. The filtering accuracy of the ceramic filter layer 11 is not limited to 8um to 15um, and may be in other ranges. Likewise, the filtration accuracy of the PTFE filtration layer 16 is not limited to 3um to 5um, but may be in other ranges.

Referring to fig. 2 to 5, fig. 3 is an enlarged schematic view of fig. 1 at B, and fig. 4 is an enlarged schematic view of fig. 1 at C. Further, the filter device 10 further comprises a housing 17. The ceramic filter layer 11, the activated carbon filter layer 12 and the PTFE filter layer 16 are all sleeve-shaped. The ceramic filter layer 11 is embedded in the housing 17, and the outer wall of the ceramic filter layer 11 and the inner wall of the housing 17 enclose a first buffer space 141. The activated carbon filter layer 12 is embedded in the ceramic filter layer 11, and the outer wall of the activated carbon filter layer 12 and the inner wall of the ceramic filter layer 11 enclose a second buffer space 142. The PTFE filter layer 16 is embedded in the activated carbon filter layer 12, and a fourth buffer space 144 is defined by the outer wall of the PTFE filter layer 16 and the inner wall of the activated carbon filter layer 12. The nanofiltration membrane 13 is embedded in the PTFE filter layer 16, and a fifth buffer space 145 is defined by the outer wall of the nanofiltration membrane 13 and the inner wall of the PTFE filter layer 16. Therefore, the first buffer space 141 is annular around the ceramic filter layer 11, the second buffer space 142 is annular around the activated carbon filter layer 12, the fourth buffer space 144 is annular around the PTFE filter layer 16, the fifth buffer space 145 is annular around the nanofiltration membrane 13, the filtering direction is sequentially from outside to inside, and finally the center of the nanofiltration membrane 13 is led out, so that the size of the filtering device 10 is small, the occupied space is small, and the arrangement is flexible.

Referring to fig. 2 to 4, in one embodiment, the housing 17 has two opposite open ends, and the filter device 10 further includes two end cover plates 18 respectively disposed at the two open ends in a one-to-one correspondence. The end cap plate 18 sealingly abuts the open end, the end of the ceramic filter layer 11, the end of the activated carbon filter layer 12, and the end of the PTFE filter layer 16. Thus, water in the first buffer space 141, the second buffer space 142, and the fourth buffer space 144 can be prevented from leaking to the outside, and the sealing performance is good.

Referring to fig. 1, 2 and 4, in one embodiment, a core tube is disposed inside the nanofiltration membrane 13. The pipe wall of the core pipe is provided with a plurality of first through holes, and one end of the core pipe is connected with a first drainage pipe 152. The first drain pipe 152 extends through the nanofiltration membrane 13 and one of the end cap plates 18 to the outside of the housing 17. Therefore, raw water enters the core pipe after being filtered by the nanofiltration membrane 13, and the core pipe is discharged outwards through the first water discharge pipe 152. As an optional scheme, a rear-end water treatment device may be disposed inside the nanofiltration membrane 13, and water filtered by the nanofiltration membrane 13 is further filtered by the rear-end water treatment device and then discharged to the outside.

Referring to fig. 1, 2 and 4, a second drain pipe 153 is further connected to the other end of the core pipe. The second water outlet pipe 153 extends through the nanofiltration membrane 13 and the other end cover plate 18 to the outside of the housing 17. Thus, in general, the first drain pipe 152 is in an open state to discharge the water filtered by the nanofiltration membrane 13, the first drain pipe 152 is located above the nanofiltration membrane 13, the air in the core pipe can be completely discharged by discharging the water through the first drain pipe 152, and the second drain pipe 153 is in a closed state. When the maintenance is needed, the second water drainage pipe 153 is opened because the second water drainage pipe 153 is located below the nanofiltration membrane 13, and the water in the nanofiltration membrane 13 can be completely discharged outwards after the second water drainage pipe 153 is opened.

Referring to fig. 1, 2 and 4, a sixth buffer space 146 is formed between the end surface of the nanofiltration membrane 13 and the end cover plate 18 at an interval, and the sixth buffer space 146 is communicated with the fifth buffer space 145.

Referring to fig. 1, 2 and 4, in one embodiment, the filter device 10 further includes a first mouthpiece 154 and a second mouthpiece 155. The first mouthpiece 154 and the second mouthpiece 155 are respectively disposed on the two end cover plates 18, and both the first mouthpiece 154 and the second mouthpiece 155 are communicated with the sixth buffer space 146. Specifically, a first mouthpiece 154 is provided on the endcover 18 at a top portion of the housing 17 and a second mouthpiece 155 is provided on the endcover 18 at a bottom portion of the housing 17. Thus, in specific operation, raw water enters the fifth buffer space 145 and the sixth buffer space 146 after passing through the PTFE filter layer 16, and the nanofiltration membrane 13 further filters divalent salt ions such as Ca2+, Mg2+, and the like, so that the divalent salt ions such as Ca2+, Mg2+, and the like are retained in the fifth buffer space 145 and the sixth buffer space 146, which increases the divalent salt ion concentration of the raw water in the fifth buffer space 145 and the sixth buffer space 146, and a part of the raw water with a higher concentration can be discharged outwards through the first interface tube 154, so that the divalent salt ion concentration in the raw water can be reduced, and the undesirable phenomenon that the divalent salt ions scale on the outer surface of the nanofiltration membrane 13 can be avoided. In addition, the filtering apparatus 10 further includes a first circulation line (not shown in the drawings) connecting the first mouthpiece 154 and the second mouthpiece 155, the first circulation line can provide a suction force to draw out the raw water in the sixth buffer space 146 through the first mouthpiece 154 and return the raw water to the sixth buffer space 146 through the second mouthpiece 155, so as to increase the flow rate of the raw water in the fifth buffer space 145 and the sixth buffer space 146, perform a scouring action on the outer surface of the nanofiltration membrane 13, and avoid the undesirable phenomenon of scaling on the outer surface of the nanofiltration membrane 13. In addition, when the maintenance is stopped, the raw water in the fifth buffer space 145 and the sixth buffer space 146 may be discharged to the outside through the second mouthpiece 155.

Referring to fig. 1, 2 and 4, further, the end cover plate 18 includes a middle plate 181 and a peripheral plate 182. The peripheral plate 182 is disposed around the periphery of the central plate 181. The peripheral plate 182 sealingly abuts the open end, the end of the ceramic filter layer 11, the end of the activated carbon filter layer 12, and the end of the PTFE filter layer 16, respectively. The middle plate 181 and the nanofiltration membrane 13 are arranged at intervals, the middle plate 181 is provided with a positioning element 1811, and the positioning element 1811 is connected with the nanofiltration membrane 13. Specifically, the peripheral plate 182 is configured to contact the open end, the end of the ceramic filter layer 11, the end of the activated carbon filter layer 12, and the end of the PTFE filter layer 16 with the first seal member 191, thereby ensuring the sealing performance of the first buffer space 141, the second buffer space 142, and the fourth buffer space 144. Similarly, a second sealing member 192 is provided at a portion where the middle plate 181 is connected to the peripheral plate 182, so that the sealability of the sixth buffer space 146 can be ensured. In addition, the middle plate 181 is connected to the nanofiltration membrane 13 through the positioning member 1811, which has a positioning function on the nanofiltration membrane 13 and prevents the nanofiltration membrane 13 from moving in the axial direction of the support tube 193.

It should be noted that, in infringement comparison, the "middle plate 181" may be a part of the "peripheral plate 182", that is, the "middle plate 181" and the "other part of the peripheral plate 182" are integrally formed; or a separate member that is separable from the other portions of peripheral plate 182, i.e., central plate 181 can be manufactured separately and then integrated with the other portions of peripheral plate 182.

It should be noted that in infringement comparison, the "positioning member 1811" may be a "portion of the middle plate 181", that is, the "positioning member 1811" is integrally formed with "other portions of the middle plate 181"; alternatively, a separate member may be provided that is separable from the other portions of the middle plate 181. that is, the positioning member 1811 may be separately manufactured and then integrated with the other portions of the middle plate 181.

Referring to fig. 2-4, in one embodiment, the filter assembly 10 further includes a support tube 193 embedded within the PTFE filter layer 16. The wall of the support pipe 193 is provided with a plurality of second through holes, and the outer wall of the support pipe 193 is connected with the inner wall of the PTFE filter layer 16. The nanofiltration membrane 13 is embedded inside the support pipe 193. So, the stay tube 193 plays the supporting role to PTFE filter layer 16, also plays the positioning action to nanofiltration membrane 13 simultaneously, can avoid appearing damaging in the stay tube 193 use to and prolong filter equipment 10's life.

Referring to fig. 2 to 4, in one embodiment, the filter device 10 further includes a discharge pipe 156 communicating with the first buffer space 141. The inlet pipe 151 is provided on one of the end closure plates 18 and the outlet pipe 156 is provided on the other end closure plate 18. Specifically, the inlet pipe 151 is located on the end cover plate 18 at the bottom portion of the housing 17, and the outlet pipe 156 is located on the end cover plate 18 at the top portion of the housing 17. The filtering apparatus 10 is further provided with a second circulation line through which the discharge pipe 156 communicates with the water inlet pipe 151. The second circulation pipeline can provide suction and outwards take out the raw water in with first buffer space 141 through delivery pipe 156, and send back to first buffer space 141 through inlet tube 151 simultaneously in, inlet tube 151 is more than the raw water that lets in external world like this, simultaneously can also send back the raw water of second circulation pipeline to first buffer space 141, and then can increase the velocity of flow of raw water in first buffer space 141, play the scouring action to the surface of ceramic filter layer 11, the bad phenomenon of piling up particulate matter impurity appears on the surface of ceramic filter layer 11.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a filter device 10 according to another embodiment of the present invention. Unlike the filtering device 10 illustrated in fig. 1 to 5, which is cylindrical as a whole, and the ceramic filter layer 11, the activated carbon filter layer 12, and the PTFE filter layer 16, which are sleeve-shaped, as an alternative, the ceramic filter layer 11, the activated carbon filter layer 12, the PTFE filter layer 16, and the nanofiltration membrane 13 are all plate-shaped and are sequentially arranged from top to bottom.

Referring to fig. 1, fig. 2 and fig. 7, fig. 7 is a schematic structural diagram of a filtering system according to an embodiment of the invention. In one embodiment, a filtration system includes a filtration device 10.

When the filtering system is used, raw water enters the first buffering space 141 through the water inlet pipe 151, large-particle suspended matters in the raw water are filtered by the ceramic filtering layer 11 and then enter the second buffering space 142, residual chlorine and other organic matters in the raw water are filtered by the activated carbon filtering layer 12 and then enter the third buffering space 143, and then divalent salt ions such as Ca2+, Mg2+ in the raw water are filtered by the nanofiltration membrane 13 and then enter the rear-end treatment process, so that the divalent salt scaling of the rear-end reverse osmosis process can be prevented. Wherein, ceramic filter layer 11 is integration sintered pottery, and it is good to filter the aperture homogeneity, and ceramic filter layer 11 is fixed, can not lead to indiscriminate layer because of installation or backwash technology, and ceramic filter layer 11 washs simple process, can use compressed air to mix the backwash, and ceramic filter layer 11 is convenient for the whole disposable change simultaneously, and weight is less, and does not need the layering to fill, can greatly reduced running cost with be convenient for maintain the work. In addition, the nanofiltration membrane 13 is made of polyamide materials compared with a traditional softener, the processing technology is better in filling uniformity and better in long-term operation stability compared with a filler, and the nanofiltration membrane 13 does not need a sodium chloride regeneration technology, so that the operation cost and the environmental pollution pressure are reduced.

Referring to fig. 7, in one embodiment, there are more than two filtering devices 10, and the more than two filtering devices 10 are disposed in parallel.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (15)

1. A filter device, comprising:

ceramic filter layer, active carbon filter layer and receive the filter membrane, ceramic filter layer active carbon filter layer with receive the filter membrane and set gradually, ceramic filter layer deviate from in one side of active carbon filter layer has first buffering space, ceramic filter layer sintering pottery as an organic whole, first buffering space is used for being linked together with the inlet tube, ceramic filter layer towards one side of active carbon filter layer with there is second buffering space between the active carbon filter layer, the active carbon filter layer with receive and be equipped with third buffering space between the filter membrane.

2. The filtration device of claim 1, further comprising a PTFE filter layer disposed between the activated carbon filter layer and the nanofiltration membrane; the PTFE filter layer is of an integrated sintering structure; the PTFE filter layer divides the third buffer space into a fourth buffer space and a fifth buffer space.

3. The filtration device of claim 2, wherein the activated carbon filtration layer is a unitary sintered activated carbon structure.

4. The filter device according to claim 2, wherein the ceramic filter layer has a filtration precision of 8-15 um; the filtering precision of the PTFE filtering layer is 3um-5 um; the filtration precision of the nanofiltration membrane is not more than 1 nm.

5. The filtration device of claim 2, further comprising a housing, wherein the ceramic filter layer, the activated carbon filter layer, and the PTFE filter layer are all sleeve-shaped; the ceramic filter layer is embedded in the shell, and the outer wall of the ceramic filter layer and the inner wall of the shell enclose the first buffer space; the active carbon filter layer is embedded in the ceramic filter layer, and the outer wall of the active carbon filter layer and the inner wall of the ceramic filter layer enclose the second buffer space; the PTFE filter layer is embedded in the activated carbon filter layer, and the outer wall of the PTFE filter layer and the inner wall of the activated carbon filter layer enclose the fourth buffer space; the nanofiltration membrane is embedded in the PTFE filter layer, the outer wall of the nanofiltration membrane and the inner wall of the PTFE filter layer are enclosed to form the fifth buffer space.

6. The filter device according to claim 5, wherein the housing has two opposite open ends, and the filter device further comprises two end cover plates respectively disposed at the two open ends in a one-to-one correspondence, and the end cover plates are in sealing contact with the open ends, the ends of the ceramic filter layer, the ends of the activated carbon filter layer, and the ends of the PTFE filter layer.

7. The filtering device as claimed in claim 6, wherein a core tube is disposed inside the nanofiltration membrane, a plurality of first through holes are disposed on a wall of the core tube, one end of the core tube is connected to a first drainage pipe, and the first drainage pipe penetrates through the nanofiltration membrane and one of the end cover plates extends out of the housing.

8. The filtration apparatus of claim 7, wherein a second drain pipe is connected to the other end of the core pipe, and the second drain pipe penetrates through the nanofiltration membrane and the other end cover plate and extends to the outside of the housing.

9. The filtering device as claimed in claim 6, wherein a sixth buffer space is formed between the end face of the nanofiltration membrane and the end cover plate at an interval, and the sixth buffer space is communicated with the fifth buffer space.

10. The filtration device of claim 9, further comprising a first mouthpiece and a second mouthpiece; the first interface tube and the second interface tube are respectively arranged on the two end cover plates, and the first interface tube and the second interface tube are communicated with the sixth buffer space.

11. The filter apparatus of claim 10, wherein said end cap plate includes a central plate and a peripheral plate, said peripheral plate being disposed about a periphery of said central plate; the peripheral plate is respectively in sealing contact with the opening end, the end part of the ceramic filter layer, the end part of the activated carbon filter layer and the end part of the PTFE filter layer; the middle plate and the nanofiltration membrane are arranged at intervals, the middle plate is provided with a positioning piece, and the positioning piece is connected with the nanofiltration membrane.

12. The filter device as claimed in claim 5, further comprising a support tube embedded in the PTFE filter layer, wherein a plurality of second through holes are arranged on the wall of the support tube, and the outer wall of the support tube is connected with the inner wall of the PTFE filter layer; the nanofiltration membrane is embedded in the supporting tube.

13. A filter device as claimed in any one of claims 5 to 12, wherein the filter device further comprises a discharge pipe communicating with the first buffer space, the inlet pipe being provided in one of the end closure plates and the discharge pipe being provided in the other end closure plate.

14. A filtration system, characterized in that it comprises a filtration device according to any one of claims 1 to 13.

15. The filtration system of claim 14, wherein the filtration device is two or more, and wherein the two or more filtration devices are arranged in parallel.

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