阅读说明：本技术 一种过滤机及过滤方法 (Filter and filtering method ) 是由 佘勃强 王琳 南海娟 吴引江 刘吉坡 王翠翠 王淏 戚乐 董鹏 于 2021-11-03 设计创作，主要内容包括：本发明公开了一种过滤机及过滤方法,涉及固液过滤分离技术领域。用以解决现有料液过滤因滤饼厚度不断增长,导致过滤效率低和过滤耗能高的问题。该过滤机包括：空心旋转主轴,其设置在密封承压壳体内,贯穿多个烧结金属过滤盘的中心并带动所述烧结金属过滤盘水平旋转；进料总管,其一端与料液进口连接,另一端延伸至所述密封承压壳体内,且分别与多个布料管连接；所述布料管与所述烧结金属过滤盘间隔设置,其上设置刮刀；所述刮刀沿所述烧结金属过滤盘方向设置,用于在所述烧结金属过滤盘水平旋转时,将来自布料管的料液预涂在所述烧结金属过滤盘上,形成薄滤饼层,并限制薄滤饼层的厚度。(The invention discloses a filter and a filtering method, and relates to the technical field of solid-liquid filtering separation. The filter is used for solving the problems of low filter efficiency and high filter energy consumption caused by the continuous increase of the thickness of a filter cake in the existing feed liquid filtration. This filter includes: the hollow rotating main shaft is arranged in the sealed pressure-bearing shell, penetrates through the centers of the sintered metal filter discs and drives the sintered metal filter discs to rotate horizontally; one end of the feeding main pipe is connected with the feed liquid inlet, and the other end of the feeding main pipe extends into the sealed pressure-bearing shell and is respectively connected with the plurality of distributing pipes; the distributing pipe and the sintered metal filter disc are arranged at intervals, and a scraper is arranged on the distributing pipe; the scraper is arranged along the direction of the sintered metal filter disc and is used for pre-coating the feed liquid from the distributing pipe on the sintered metal filter disc when the sintered metal filter disc rotates horizontally to form a thin filter cake layer and limit the thickness of the thin filter cake layer.)

1. A filter, comprising:

the hollow rotating main shaft is arranged in the sealed pressure-bearing shell, penetrates through the centers of the sintered metal filter discs and drives the sintered metal filter discs to rotate horizontally;

one end of the feeding main pipe is connected with the feed liquid inlet, and the other end of the feeding main pipe extends into the sealed pressure-bearing shell and is respectively connected with the plurality of distributing pipes;

the distributing pipe and the sintered metal filter disc are arranged at intervals, and a scraper is arranged on the distributing pipe; the scraper is arranged along the radius direction of the sintered metal filter disc and is used for pre-coating the feed liquid from the distributing pipe on the sintered metal filter disc when the sintered metal filter disc rotates horizontally to form a thin filter cake layer and limit the thickness of the thin filter cake layer.

2. A filter according to claim 1, further comprising a rotary drive;

the rotation driving device is connected with the tail end of the hollow rotating main shaft and is used for driving the hollow rotating main shaft to rotate;

the hollow rotating main shaft is further provided with an annular shaft shoulder, the annular shaft shoulder is located below the lowermost sintered metal filter disc, and a plurality of first inner hexagonal socket head cap screws are arranged in the annular shaft shoulder.

3. The filter according to claim 2 wherein the sintered metal filter disks comprise single-sided sintered metal filter disks and double-sided sintered metal filter disks;

a plurality of second inner hexagonal socket head cap screws sequentially penetrate through the upper inner lantern ring, the sintered metal porous disc, the compact metal supporting disc and the lower inner lantern ring from top to bottom, or the plurality of second inner hexagonal socket head cap screws sequentially penetrate through the upper inner lantern ring, the compact metal supporting disc, the sintered metal porous disc and the lower inner lantern ring from top to bottom, and the inner side of the outer hoop is tightly attached to the outer peripheral sides of the sintered metal porous disc and the compact metal supporting disc to form a single-sided sintered metal filter disc;

the second hexagon socket head cap screws sequentially penetrate through the upper inner lantern ring, the sintered metal porous disc, the compact metal supporting disc, the sintered metal porous disc and the lower inner lantern ring from top to bottom, and the inner side of the outer hoop is tightly attached to the compact metal supporting disc and the outer peripheral side of the sintered metal porous disc located on the upper layer and the lower layer of the compact metal supporting disc to form the double-faced sintered metal filter disc.

4. A filter according to claim 3 wherein a circular recess is provided in the lower surface of the lower inner collar;

the number of the first inner hexagonal socket head cap screws positioned in the annular shaft shoulder is consistent with that of the circular concave holes, and the diameter of the cylinder head of each first inner hexagonal socket head cap screw is matched with that of the circular concave hole;

the quantity of the second inner hexagonal socket head cap screws in each sintered metal filter disc is consistent with the quantity of the circular concave holes in the lower inner sleeve ring, and the diameter of the cylinder heads of the second inner hexagonal socket head cap screws is matched with the diameter of the circular concave holes.

5. The filter according to claim 4, wherein the number of the first socket head cap screws is 4 to 12, the number of the second socket head cap screws is 4 to 12, and the number of the circular recesses is 4 to 12.

6. The filter according to claim 1, wherein said hollow rotating main shaft is vertically disposed in the upper and lower end enclosures of said pressure-bearing sealed housing by means of upper and lower sealing means;

an axial inner hole is formed in the middle of the hollow rotating main shaft, a plurality of transverse holes are formed in the wall of the axial inner hole and communicated with the sintered metal filter disc, and the tail end of the axial inner hole is connected with a filtered liquid outlet.

7. The filter according to claim 1, further comprising a scraper adjustment device;

two the scraper sets up respectively the upside and the downside of distributing pipe, scraper adjusting device is used for adjusting the scraper with the clearance between the sintered metal filter disc, the clearance is between 0.1 ~ 5 mm.

8. The filter according to claim 1, wherein said plurality of sintered metal filter disks are vertically stacked along said hollow rotating spindle, said sintered metal filter disks having a filtration precision of 0.1 to 30 μm;

the diameter of the sintered metal filter disc is 200-1500 mm, and the sum of the areas of the sintered metal filter discs is 20-100 m²。

9. The filter according to claim 1, wherein the closed pressure-bearing shell comprises an upper head, a cylinder, a lower head and support legs;

the upper end enclosure is welded with the cylinder; the lower end enclosure is connected with the cylinder through a flange;

a turbid liquid outlet is formed in the lower end enclosure; and the upper end enclosure is provided with an exhaust port and a replacement port.

10. A method of filtering in a filter comprising:

the hollow rotating main shaft drives the sintered metal filter discs to rotate at a low speed, feed liquid is distributed on each sintered metal filter disc through a distribution pipe, a scraper arranged on the distribution pipe uniformly scrapes the feed liquid on the sintered metal filter discs, and a thin filter cake layer is formed on the sintered metal filter discs;

switching a filtered liquid outlet pipeline valve, driving a sintered metal filter disc to rotate at a low speed by a hollow rotating main shaft, controlling the thickness of the thin filter cake layer by a scraper, filtering feed liquid by the thin filter cake layer and the sintered metal filter disc, and discharging the feed liquid from a filtered liquid outlet through an axial hole of the hollow rotating main shaft;

and switching a turbid liquid outlet pipeline valve, driving the sintered metal filter disc to rotate at a high speed by the hollow rotating main shaft, and stripping the thin filter cake layer from the sintered metal filter disc to be discharged from a turbid liquid outlet.

Technical Field

The invention relates to the technical field of solid-liquid filtering separation, in particular to a filtering machine and a filtering method.

Background

Filtration is one of the most basic chemical processes. The filter cloth is used for filtering interception objects to process feed liquid containing solid particles, clear liquid in the feed liquid passes through pore passages of the filter cloth to become filtrate under the action of external force, and solid particles in the feed liquid are intercepted and intercepted on the filter cloth to become filter cakes, so that the filtration separation is realized. In order to continue filtration, the conventional practice in the prior art is to periodically clean the filter cake, regenerate the filter and restore the filtering capacity of the filter cloth, and this practice has the disadvantage that the filtration must be interrupted for each filtration unit when the filter cake is cleaned, which is a batch operation, which is inefficient and which does not allow continuous filtration. The other method is to adopt a cross-flow filtration mode, slow down and avoid the aggregation of particulate matters by utilizing the scouring of the feed liquid flowing at a high speed along the surface of the filter material, realize the increase or not of the thickness of the filter cake at a very slow speed, thus slowing down the increase of the filtration resistance and obtaining the long-time continuous filtration, but the feed liquid flowing at a high speed needs to be provided with a circulating pump with large displacement, consumes much kinetic energy and has high energy consumption for filtration.

In conclusion, the existing feed liquid filtration has the problems of low filtration efficiency and high filtration energy consumption due to the fact that the thickness of a filter cake is continuously increased.

Disclosure of Invention

The embodiment of the invention provides a filter and a filtering method, which are used for solving the problems of low filtering efficiency and high filtering energy consumption caused by the fact that the thickness of a filter cake is continuously increased in the existing feed liquid filtering.

The embodiment of the invention provides a filter, which comprises:

the hollow rotating main shaft is arranged in the sealed pressure-bearing shell, penetrates through the centers of the sintered metal filter discs and drives the sintered metal filter discs to rotate horizontally;

one end of the feeding main pipe is connected with the feed liquid inlet, and the other end of the feeding main pipe extends into the sealed pressure-bearing shell and is respectively connected with the plurality of distributing pipes;

the distributing pipe and the sintered metal filter disc are arranged at intervals, and a scraper is arranged on the distributing pipe; the scraper is arranged along the radius direction of the sintered metal filter disc and is used for pre-coating the feed liquid from the distributing pipe on the sintered metal filter disc when the sintered metal filter disc rotates horizontally to form a thin filter cake layer and limit the thickness of the thin filter cake layer.

Preferably, the device further comprises a rotation driving device;

the rotation driving device is connected with the tail end of the hollow rotating main shaft and is used for driving the hollow rotating main shaft to rotate;

the hollow rotating main shaft is also provided with an annular shaft shoulder, the annular shaft shoulder is positioned below the lowermost sintered metal filter disc, and a plurality of first inner hexagonal socket head cap screws are arranged in the annular shaft shoulder;

the number of the first inner hexagonal socket head cap screws is 4-12.

Preferably, the sintered metal filter discs comprise single-sided sintered metal filter discs and double-sided sintered metal filter discs;

a plurality of second inner hexagonal socket head cap screws sequentially penetrate through the upper inner lantern ring, the sintered metal porous disc, the compact metal supporting disc and the lower inner lantern ring from top to bottom, or the plurality of second inner hexagonal socket head cap screws sequentially penetrate through the upper inner lantern ring, the compact metal supporting disc, the sintered metal porous disc and the lower inner lantern ring from top to bottom, and the inner side of the outer hoop is tightly attached to the outer peripheral sides of the sintered metal porous disc and the compact metal supporting disc to form a single-sided sintered metal filter disc;

a plurality of second inner hexagonal socket head cap screws sequentially penetrate through the upper inner lantern ring, the sintered metal porous disc, the compact metal supporting disc, the sintered metal porous disc and the lower inner lantern ring from top to bottom, and the inner side of the outer hoop is tightly attached to the compact metal supporting disc and the outer peripheral side of the sintered metal porous disc positioned on the upper layer and the lower layer of the compact metal supporting disc to form a double-sided sintered metal filter disc;

the number of the second inner hexagonal socket head cap screws is 4-12.

Preferably, a round concave hole is arranged in the lower surface of the lower inner lantern ring;

the number of the first inner hexagonal socket head cap screws positioned in the annular shaft shoulder is consistent with that of the circular concave holes, and the diameter of the cylinder head of each first inner hexagonal socket head cap screw is matched with that of the circular concave hole;

the quantity of the second inner hexagonal socket head cap screws in each sintered metal filter disc is consistent with the quantity of the circular concave holes in the lower inner sleeve ring, and the diameter of the cylinder heads of the second inner hexagonal socket head cap screws is matched with the diameter of the circular concave holes.

Preferably, the number of the first inner hexagonal socket head cap screws is 6, the number of the second inner hexagonal socket head cap screws is 6, and the number of the circular concave holes is 6.

Preferably, the hollow rotary main shaft is vertically arranged in an upper sealing head and a lower sealing head of the sealed pressure-bearing shell through an upper sealing device and a lower sealing device;

an axial inner hole is formed in the middle of the hollow rotating main shaft, a plurality of transverse holes are formed in the wall of the axial inner hole and communicated with the sintered metal filter disc, and the tail end of the axial inner hole is connected with a filtered liquid outlet.

Preferably, a scraper adjusting device is further included;

two the scraper sets up respectively the upside and the downside of distributing pipe, scraper adjusting device is used for adjusting the scraper with the clearance between the sintered metal filter disc, the clearance is between 0.1 ~ 5 mm.

Preferably, the plurality of sintered metal filter discs are vertically stacked and arranged along the hollow rotating main shaft, and the filtering precision of the sintered metal filter discs is 0.1-30 micrometers;

the diameter of the sintered metal filter disc is 200-1500 mm, and the sum of the areas of the sintered metal filter discs is 20-100 m²。

Preferably, the closed pressure-bearing shell comprises an upper end enclosure, a cylinder body, a lower end enclosure and supporting legs;

the upper end enclosure is welded with the cylinder; the lower end enclosure is connected with the cylinder through a flange;

a turbid liquid outlet is formed in the lower end enclosure; and the upper end enclosure is provided with an exhaust port and a replacement port.

The embodiment of the invention also provides a filtering method of the filter, which comprises the following steps:

the hollow rotating main shaft drives the sintered metal filter discs to rotate at a low speed, feed liquid is distributed on each sintered metal filter disc through a distribution pipe, a scraper arranged on the distribution pipe uniformly scrapes the feed liquid on the sintered metal filter discs, and a thin filter cake layer is formed on the sintered metal filter discs;

switching a filtered liquid outlet pipeline valve, driving a sintered metal filter disc to rotate at a low speed by a hollow rotating main shaft, controlling the thickness of the thin filter cake layer by a scraper, filtering feed liquid by the thin filter cake layer and the sintered metal filter disc, and discharging the feed liquid from the filtered liquid outlet through an axial hole of the hollow rotating main shaft;

and switching a turbid liquid outlet pipeline valve, driving the sintered metal filter disc to rotate at a high speed by the hollow rotating main shaft, and discharging the thin filter cake layer from the turbid liquid outlet after the thin filter cake layer is peeled off from the sintered metal filter disc.

The embodiment of the invention provides a filter and a filtering method, wherein the filter comprises the following components: the hollow rotating main shaft is arranged in the sealed pressure-bearing shell, penetrates through the centers of the sintered metal filter discs and drives the sintered metal filter discs to rotate horizontally; one end of the feeding main pipe is connected with the feed liquid inlet, and the other end of the feeding main pipe extends into the sealed pressure-bearing shell and is respectively connected with the plurality of distributing pipes; the distributing pipe and the sintered metal filter disc are arranged at intervals, and a scraper is arranged on the distributing pipe; the scraper is arranged along the radius direction of the sintered metal filter disc and is used for pre-coating the feed liquid from the distributing pipe on the sintered metal filter disc when the sintered metal filter disc rotates horizontally to form a thin filter cake layer and limit the thickness of the thin filter cake layer. The filter can directly pre-coat feed liquid on a sintered metal filter disc to form a thin filter cake layer on one hand through a scraper arranged on a distributing pipe; on the other hand is in filtering process, the scraper can pass through and the sintering metal filter disc between the clearance, the thickness of control thin filter cake layer, the filtration resistance increase problem that the thin filter cake layer is continuous the bodiness leads to has been avoided again in performance thin filter cake layer helps the filter effect, this thin filter cake layer can long period continuous filtration, need clear up the filter cake and lead to the problem that filtration efficiency is low in the avoidance of filtration process on the one hand, on the other hand avoids needing to be equipped with the problem that the large discharge capacity circulating pump leads to the energy consumption high. The filter has the advantages of high filtering precision, large filtering area, large bearable filtering pressure difference, compact structure and closed operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a filter according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the position of the drive connection between the hollow rotating spindle and the sintered metal filter disk according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of a method for manufacturing a filter according to an embodiment of the present invention;

the labels in the figure are: 1 is upper portion sealing device, 2 is hollow rotating main shaft, 3 is the upper cover, 4 is the interior lantern ring of going up, 5 is the porous dish of sintered metal, 6 is fine and close metal support dish, 7 is outer staple bolt, 8 is the interior lantern ring of going down, 9 is the shell ring, 10 is the main feeding pipe, 11 is the distributing pipe, 12 is the scraper, 13 is the flange, 14 is the low head, 15 is the feed liquid import, 16 is the landing leg, 17 is the rotation drive device, 18 is lower part sealing device, 19 is the filtrate export, 20 is turbid liquid export, 21 is annular shaft shoulder, 22 is first interior hexagonal cylinder head screw, 23 is circular shrinkage pool, 24 is second interior hexagonal cylinder head screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic diagram schematically illustrating a structure of a filter provided by an embodiment of the invention, and fig. 2 is a schematic diagram illustrating a position of a transmission connection between a hollow rotating main shaft and a sintered metal filter disc provided by an embodiment of the invention, and the filter mainly comprises the hollow rotating main shaft 2, a feeding main pipe 10, the sintered metal filter disc, a distribution pipe 11 and a scraper 12.

Specifically, the hollow rotating main shaft 2 is arranged in the sealed pressure-bearing shell and penetrates through inner sleeve annular holes of the sintered metal filter discs, and the sintered metal filter discs are driven to rotate horizontally when the hollow rotating main shaft 2 rotates.

One end of the feeding main pipe 10 is connected with the feed liquid inlet 15, the other end extends into the sealed pressure-bearing shell and is arranged at one side inside the shell, the feeding main pipe 10 is provided with a plurality of distributing pipes 11, namely, the feeding main pipe 10 is respectively connected with the distributing pipes 11, in the embodiment of the invention, the distributing pipes 11 are required to be arranged at intervals with the sintered metal filter discs, so that the number of the distributing pipes 11 corresponds to the number of the sintered metal filter discs.

Be provided with scraper 12 on cloth pipe 11, scraper 12 sets up along the radius direction of sintered metal filter disc, when hollow rotating main shaft 2 drove the rotation of sintered metal filter disc horizontal direction, scraper 12 can be with the even precoating of feed liquid from cloth pipe 11 on the sintered metal filter disc, form the thin filter cake layer on the sintered metal filter disc, when thin filter cake layer and sintered metal filter disc filter the feed liquid, because of the interval between scraper 12 and the sintered metal filter disc is fixed, so can play the limiting action to the thickness of bo filter cake layer.

According to the filter provided by the embodiment of the invention, the scraper 12 arranged on the distributing pipe 11 is used for directly pre-coating the feed liquid on the sintered metal filter disc to form a thin filter cake layer; on the other hand is in filtering process, scraper 12 can be through with the sintering metal filter disc between the clearance, the thickness of control thin filter cake layer, the filtration resistance increase problem that the continuous bodiness of thin filter cake layer leads to has been avoided again in performance thin filter cake layer helps the filter effect, this thin filter cake layer can long period continuous filtration, need clear up the filter cake and lead to the problem that filtration efficiency is low in the avoidance of filtering process on the one hand, on the other hand avoids needing to be equipped with the problem that the large discharge capacity circulating pump leads to the energy consumption height.

In the embodiment of the invention, the vertical closed pressure-bearing shell comprises an upper end enclosure 3, a cylinder body, a lower end enclosure 14 and supporting legs 16, specifically, the upper end enclosure 3 is connected with the cylinder body in a non-detachable welding manner, the lower end enclosure 14 is connected with the cylinder body through a flange 13, a turbid liquid outlet 20 is arranged on the lower end enclosure 14, and the upper end enclosure 3 is provided with an air outlet and a replacement port.

In one example, the filter further comprises a rotary drive 17. The hollow rotating main shaft 2 is connected with the upper seal head 3 through the upper sealing device 1 and is connected with the lower seal head 14 through the lower sealing device 18, and the upper end or the tail end of the hollow rotating main shaft 2 is connected with the rotating driving device. In one mode, the rotation driving device 17 is connected with the tail end of the hollow rotating main shaft 2 to drive the hollow rotating main shaft 2 to rotate; in another mode, the rotation driving device 17 is connected to the upper end of the hollow rotating main shaft 2 to drive the hollow rotating main shaft 2 to rotate.

In one example, an axial inner hole is formed in the middle of the hollow rotating main shaft 2, and a plurality of transverse holes are formed in the wall of one side of the axial inner hole; the hollow rotating main shaft 2 penetrates through an inner sleeve ring of the sintered metal filter disc, and a plurality of transverse holes arranged on one side of an axial inner hole are respectively contacted with the inner sleeve ring; and a transverse hole is formed in the side of the lower end of the axial inner hole of the hollow rotating main shaft 2, and the axial inner hole is communicated with a filtered liquid outlet 19 through the transverse hole.

Further, the hollow rotating main shaft 2 is further provided with an annular shoulder 21, the annular shoulder 21 is located below the lowermost sintered metal filter disc, and when the number of the sintered metal filter discs includes a plurality of ones, the annular shoulder 21 is located below one lowermost sintered metal filter disc. In the present embodiment, a plurality of first socket head cap screws 22 are provided in the annular shoulder 21.

Further, the sintered metal filter disc comprises a single-sided sintered metal filter disc and a double-sided sintered metal filter disc. Wherein, single face sintering metal filter disc includes two kinds of compound mode, mode one: a plurality of second inner hexagonal socket head cap screws 24 sequentially penetrate through the upper inner lantern ring 4, the sintered metal porous disc 5, the compact metal supporting disc 6 and the lower inner lantern ring 8 from top to bottom, and the inner side of the outer hoop 7 is tightly attached to the outer peripheral sides of the sintered metal porous disc 5 and the compact metal supporting disc 6 to form a single-sided sintered metal filtering disc; the second method comprises the following steps: a plurality of second inner hexagonal socket head cap screws 24 sequentially penetrate through the upper inner lantern ring 4, the compact metal supporting disk 6, the sintered metal porous disk 5 and the lower inner lantern ring 8 from top to bottom, and the inner side of the outer hoop 7 is tightly attached to the outer peripheral sides of the sintered metal porous disk 5 and the compact metal supporting disk 6 to form a single-sided sintered metal filtering disk.

Compared with a single-sided sintered metal filter disc, the double-sided sintered metal filter disc is provided with one more sintered metal porous disc 5, and the structure is as follows: the plurality of second inner hexagonal socket head cap screws 24 sequentially penetrate through the upper inner lantern ring 4, the sintered metal porous disc 5, the compact metal supporting disc 6, the sintered metal porous disc 5 and the lower inner lantern ring 8 from top to bottom, and the inner side of the outer hoop 7 is tightly attached to the compact metal supporting disc 6 and the outer peripheral side of the sintered metal porous disc 5 located on the upper layer and the lower layer of the compact metal supporting disc 6, so that the double-sided sintered metal filtering disc is formed.

A circular recessed hole 23 is provided in the lower surface of the lower inner collar 8.

In the embodiment of the invention, the rotation transmission between the hollow rotating main shaft 2 and the sintered metal filter discs and between two adjacent sintered metal filter discs is realized by the first inner hexagonal socket head cap screw 22, the second inner hexagonal socket head cap screw 24 and the circular concave hole 23 on the inner lantern ring.

Specifically, the number of the first socket cap screws 22 positioned in the annular shaft shoulder 21 is the same as the number of the circular concave holes 23, and the diameter of the cylindrical head of the first socket cap screw 22 is matched with the diameter of the circular concave hole 23; i.e., the socket head of each first socket cap head cap screw 22 may extend into the circular recess 23.

It should be noted that, when the hollow rotary spindle 2 is provided with a plurality of sintered metal filter disks, the diameters of the heads of the second socket head cap screws 24 included in each sintered metal filter disk are all the same, the inner diameters of the circular concave holes 23 included in each sintered metal filter disk are all the same, and the number of the second socket head cap screws 24 included in each sintered metal filter disk is the same as the number of the circular concave holes 23. I.e. the socket head of the second socket head cap screw 24 included in each sintered metal filter disc may extend into the circular recess 23.

In the embodiment of the invention, the number of the first inner hexagonal socket head cap screw 22 included in the annular shaft shoulder 21 of the hollow rotary main shaft 2, the number of the second inner hexagonal socket head cap screw 24 included in each sintered metal filter disc and the number of the circular concave holes 23 arranged on each lower inner lantern ring 8 are 4-12. Preferably, the number of the first hexagon socket head cap screws 22 included in the annular shoulder 21 of the hollow rotary main shaft 2, the number of the second hexagon socket head cap screws 24 included in each sintered metal filter disc, and the number of the circular concave holes 23 provided in each lower inner collar 8 are 6.

In one example, the filter further comprises a scraper adjusting device, wherein the scraper adjusting device is arranged on the distributing pipe 11 and used for adjusting the gap between the scraper 12 and the sintered metal filter disc. In the embodiment of the present invention, because the distributing pipe 11 and the sintered metal filter disk are arranged at an interval, when the sintered metal filter disk is a single-sided sintered metal filter disk, only one scraper 12 may be arranged on the distributing pipe 11, and the scraper 12 is used in cooperation with the single-sided sintered metal filter disk, for example, if the sintered metal porous disk 5 included in the single-sided sintered metal filter disk is located on the upper layer of the dense metal support disk 6, the scraper 12 is arranged on the lower side of the distributing pipe 11; if the single-side sintered metal filter disc comprises a sintered metal porous disc 5 positioned at the lower layer of the compact metal support disc 6, the scraper 12 is arranged at the upper side of the distributing pipe 11.

Further, when the sintered metal filter disc is a double-sided sintered metal filter disc, the scrapers 12 need to be arranged on the upper side and the lower side of the distributing pipe 11, in practical application, the thickness of the thin filter cake formed on the sintered metal filter disc is different when different feed liquids are filtered, and in order to improve the filtering effect, the gap between the scraper 12 and the sintered metal filter disc can be adjusted through the scraper adjusting device.

In the embodiment of the invention, the clearance between the scraper 12 and the sintered metal filter disc is 0.1-5 mm.

In one example, a plurality of sintered metal filter disks arranged on the hollow rotating spindle 2 are vertically stacked along the hollow rotating spindle 2, each sintered metal filter disk has a filtering precision of 0.1 to 30 micrometers, and each sintered metal filter disk has a diameter of 200 to 1500 millimeters.

In one example, the sum of the areas of a plurality of sintered metal filter discs arranged on the hollow rotating main shaft 2 is 20-100 m²。

In order to more clearly describe the filter provided by the embodiment of the invention, the filtering method of the filter is described in detail below with reference to fig. 3. Specifically, as shown in fig. 3, the filtering method includes the steps of:

101, driving a sintered metal filter disc to rotate at a low speed by a hollow rotating main shaft, distributing feed liquid to each sintered metal filter disc through a distribution pipe, uniformly coating the feed liquid on the sintered metal filter disc by a scraper arranged on the distribution pipe, and forming a thin filter cake layer on the sintered metal filter disc;

102, switching a filtered liquid outlet pipeline valve, driving a sintered metal filter disc to rotate at a low speed by a hollow rotating main shaft, controlling the thickness of the thin filter cake layer by a scraper, filtering feed liquid by the thin filter cake layer and the sintered metal filter disc, and discharging the feed liquid from the filtered liquid outlet through an axial hole of the hollow rotating main shaft;

and 103, switching a turbid liquid outlet pipeline valve, driving the sintered metal filter disc to rotate at a high speed by the hollow rotating main shaft, and stripping the thin filter cake layer from the sintered metal filter disc to be discharged from the turbid liquid outlet.

In step 101, the filter is filled with feed liquid and air in the filter is exhausted, then the rotation driving device 17 is started to drive the hollow rotating main shaft 2 and the sintered metal filter discs to rotate at a low speed, the feed liquid from the feeding main pipe 10 is distributed on each sintered metal porous disc 5 of the sintered metal filter discs through the distributing pipe 11, filtrate is collected to the center of the filter discs through the inner holes of the sintered metal porous discs 5 and then enters the axial inner hole through the transverse hole of the hollow rotating main shaft 2, then flows into a filtrate outlet 19 from a cross hole at the lower part of the axial inner hole, filtrate returns to a feed pipeline through a valve switch on a pipeline of the filtrate outlet 19 and enters a feed inlet again for precoating circulating filtration, the scraper 12 can then act as an auxiliary precoating, making the distribution of the precoated cake more uniform on the working surface of the sintered metal porous disc 5 and the establishment of a cake layer of a set thickness faster.

In step 102, after the precoating is finished, the clear and transparent solid content of the filtered clear liquid meets the requirement, a valve switch on a pipeline of a clear liquid filtering outlet 19 is switched to carry out normal filtering, at the moment, the filter disc still rotates at a low speed, the rotating sintered metal porous disc 5 and the fixed scraper 12 are matched with each other to control the thickness of a filter cake to be a set thickness in real time, the scraper 12 plays a role in limiting the thickness increase of the filter cake layer, and the filter cake layer is controlled to be maintained on the set thickness all the time, so that the long-time filtering of the thin filter cake layer is realized, and in the process, the sintered metal filter disc keeps low energy consumption required by low-speed rotation all the time.

In step 103, after long-time filtration, the cake layer for assisting filtration is not changed in thickness, but is slowly compacted under the long-time action of the filtration pressure difference, the porosity of the filter cake is reduced, the specific resistance of filtration is increased, and the filtration flux is reduced, at this time, the cake layer needs to be regenerated, the rotation driving device 17 drives the filter disc to rotate at high speed through the hollow rotating main shaft 2, the old cake layer is peeled off by the centrifugal force generated by high-speed rotation, and then the filter disc is restored to the low-speed rotation state to perform pre-coating circulation filtration to establish the cake layer and normal filtration.

The filtering method provided by the embodiment of the invention realizes the long-period thin filter cake layer filtering, plays the role of filter cake layer filtration assistance, and avoids the problem of filter resistance increase caused by continuous thickening of the filter cake layer, thereby realizing the long-period online continuous filtering and having low energy consumption.

In order to more clearly describe the filter and the filtering method provided by the embodiment of the invention, a vertical closed rotary disc filter for filtering a thin filter cake layer and a filtering method are described in detail below by taking fig. 1 as an example.

The vertical closed rotary disc filter for filtering the thin filter cake layer mainly comprises a vertical closed pressure-bearing shell, a sintered metal filter disc, a feeding main pipe 10, a distributing pipe 11, a scraper 12, a sealing device and a rotation driving device 17.

Specifically, a vertical closed pressure-bearing shell is composed of an upper end enclosure 3, a cylinder body and a lower end enclosure 14, the upper end enclosure 3 is connected with the cylinder body through welding, the lower end enclosure 14 is fixed with the cylinder body through a flange 13, the flange 13 is formed by an upper part and a lower part which are arranged in pairs, supporting legs 16 are arranged below the lower end enclosure 14, the number of the supporting legs 16 is three, turbid liquid outlets 20 are arranged below the side of the lower end enclosure 14, and the upper end enclosure 3 is provided with an air outlet and a replacement port.

The hollow rotating main shaft 2 is vertically installed in an upper seal head 3 and a lower seal head 14 of the vertical closed pressure-bearing shell through an upper sealing device 1 and a lower sealing device 18, an axial inner hole is formed in the middle of the hollow rotating main shaft 2, and a plurality of transverse holes are formed in the wall of one side of the axial inner hole. An annular shaft shoulder 21 is arranged at the outer circle of the lower part of the hollow rotating main shaft 2, and six first inner hexagonal socket head cap screws 22 are arranged on the annular shaft shoulder 21. The lower end side of the axial inner hole of the hollow rotating main shaft 2 is provided with a transverse hole, so that the inner hole of the hollow rotating shaft is communicated with a filtered liquid outlet 19, and the lowest end of the hollow rotating main shaft 2 is connected with a rotary driving device.

Two sintered metal porous disks 5, a compact metal supporting disk 6, a set of outer anchor ear 7, an upper inner lantern ring 4, a lower inner lantern ring 8 and six inner hexagonal socket head screws form a double-sided sintered metal filter disk. Specifically, the end faces of the sintered metal porous disc 5, the compact metal support disc 6, the upper inner lantern ring 4 and the lower inner lantern ring 8 are tightly attached together in parallel, a second inner hexagonal socket head cap screw 24 vertically penetrates through the sintered metal porous disc 5, the compact metal support disc 6, the sintered metal porous disc 5, the threaded through holes and the threaded holes with the same circumferential positions on the upper inner lantern ring 4 and the lower inner lantern ring 8 so as to fasten the two, and the outer hoop 7 is tightly attached along the outer circles of the sintered metal porous disc 5 and the compact metal support disc 6 to form the double-sided sintered metal filter disc.

The rotation transmission between the hollow rotating main shaft 2 and the sintered metal filter disc depends on six first inner hexagonal socket head cap screws 22 on the annular shaft shoulder 21 and six circular concave holes 23 arranged on the lower inner lantern ring 8, and when the cylindrical heads of the six first inner hexagonal socket head cap screws 22 are embedded into the six circular concave holes 23, the rotation between the hollow rotating main shaft 2 and the sintered metal filter disc can be realized;

the rotation transmission between two sintering metal filter discs which are stacked up and down is realized through six second inner hexagonal socket head cap screws 24 in the next sintering metal filter disc and six circular concave holes 23 arranged on the lower inner lantern ring 8, and when the cylindrical heads of the six second inner hexagonal socket head cap screws 24 are embedded into the six circular concave holes 23, the rotation between the two sintering metal filter discs which are stacked up and down can be realized.

Further, in the embodiment of the present invention, the filtering precision of the double-sided sintered metal filter disc is 5 microns, the diameter of the double-sided sintered metal filter disc is 1000 mm, 36 sintered metal filter discs are vertically stacked, and the total filtering area is 50 square meters.

The hollow rotating main shaft 2 is perpendicular to the sintered metal porous disc 5, penetrates through center holes of an upper inner lantern ring 4 and a lower inner lantern ring 8 of the sintered metal filter disc, a transverse hole is formed in each inner lantern ring, a feeding main pipe 10 is vertically arranged on the left side inside the shell, a material liquid inlet 15 is formed in the lower end of the feeding main pipe 10, 37 transverse distributing pipes 11 are arranged on the feeding main pipe 10, the number of the distributing pipes 11 is one more than that of the sintered metal filter disc, a scraper adjusting device and two elongated scrapers 12 are arranged on each distributing pipe 11, the scrapers 12 are arranged in a spreading mode in the radius direction of the sintered metal filter disc, and the positions of the scrapers 12 are adjusted through the scraper adjusting device so that the gaps between the scrapers 12 and the working face of the sintered metal porous disc 5 are millimeters.

When the device works, the filter is filled with feed liquid and air in the filter is exhausted, then the rotation driving device 17 is started to drive the filter discs to rotate at a low speed of 30-40 r/min, the feed liquid from the feeding main pipe 10 is distributed on each sintered metal porous disc 5 through the distributing pipe 11, filtrate is collected to the center of the filter discs through the inner holes of the sintered metal porous discs 5 and then enters the axial inner hole through the transverse hole of the hollow rotating main shaft 2, then the filtrate flows into a filtrate outlet 19 from a transverse hole at the lower part of the axial inner hole, the filtrate is switched to return to a feeding pipeline through a valve switch on the pipeline of the filtrate outlet 19, and the filtrate is subjected to precoating circulating filtration through the feeding hole again, at the moment, the scraper 12 can play a role of assisting precoating, so that the distribution of a precoating filter cake on the working surface of the sintered metal porous disc 5 is more uniform, and the establishment of a thin filter cake layer with the set thickness of 3 mm is quicker.

After the precoating is finished, the clear transparent solid content of the filtered clear liquid meets the requirement, a valve switch on a pipeline of a clear liquid filtering outlet 19 is switched to carry out normal filtering, at the moment, the filter disc still rotates at a low speed of 30-40 r/min, the rotating sintered metal porous disc 5 and the fixed scraper 12 are matched with each other to control the thickness of a filter cake to be 3 mm, the scraper 12 plays a role in limiting the thickness increase of the filter cake layer, and the filter cake layer is controlled to be always maintained at the set thickness of 3 mm of the filter cake layer, so that the long-time filtering of the filter cake layer is realized, and the energy consumption required by the low-speed rotation of the filter disc at 30-40 r/min is low and generally does not exceed 10 KW.

After long-time filtration, the thickness of the thin filter cake layer playing a role in assisting filtration is unchanged, but the thin filter cake layer is slowly compacted under the long-time action of the filtration pressure difference, the porosity of a filter cake is reduced, the specific resistance of filtration is increased, and the filtration flux is reduced, at the moment, the thin filter cake layer needs to be regenerated, the rotary driving device 17 drives the filter disc to rotate at a high speed of 150-200 r/min for 2-3 min through the hollow rotary main shaft 2, the old thin filter cake layer is peeled off by using the centrifugal force generated by high-speed rotation, and then the filter disc is restored to a low-speed rotation state to perform pre-coating circulating filtration to establish the thin filter cake layer and normal filtration.

In summary, the embodiment of the present invention provides a filter and a filtering method, the filter includes: the hollow rotating main shaft is arranged in the sealed pressure-bearing shell, penetrates through the centers of the sintered metal filter discs and drives the sintered metal filter discs to rotate horizontally; one end of the feeding main pipe is connected with the feed liquid inlet, and the other end of the feeding main pipe extends into the sealed pressure-bearing shell and is respectively connected with the plurality of distributing pipes; the distributing pipe and the sintered metal filter disc are arranged at intervals, and a scraper is arranged on the distributing pipe; the scraper is arranged along the radius direction of the sintered metal filter disc and is used for pre-coating the feed liquid from the distributing pipe on the sintered metal filter disc when the sintered metal filter disc rotates horizontally to form a thin filter cake layer and limit the thickness of the thin filter cake layer. The filter can directly pre-coat feed liquid on a sintered metal filter disc to form a thin filter cake layer on one hand through a scraper arranged on a distributing pipe; on the other hand is in filtering process, the scraper can pass through and the sintering metal filter disc between the clearance, the thickness of control thin filter cake layer, the filtration resistance increase problem that the thin filter cake layer is continuous the bodiness leads to has been avoided again in performance thin filter cake layer helps the filter effect, this thin filter cake layer can long period continuous filtration, need clear up the filter cake and lead to the problem that filtration efficiency is low in the avoidance of filtration process on the one hand, on the other hand avoids needing to be equipped with the problem that the large discharge capacity circulating pump leads to the energy consumption high. The filter has the advantages of high filtering precision, large filtering area, large bearable filtering pressure difference, compact structure and closed operation.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.