GB2170732A - A filter process and its device - Google Patents
A filter process and its device Download PDFInfo
- Publication number
- GB2170732A GB2170732A GB08503072A GB8503072A GB2170732A GB 2170732 A GB2170732 A GB 2170732A GB 08503072 A GB08503072 A GB 08503072A GB 8503072 A GB8503072 A GB 8503072A GB 2170732 A GB2170732 A GB 2170732A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- wire
- filter
- screw thread
- thread portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 10
- 239000010419 fine particle Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 18
- 239000012535 impurity Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
- B01D29/48—Edge filtering elements, i.e. using contiguous impervious surfaces of spirally or helically wound bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/18—Filters characterised by the openings or pores
- B01D2201/184—Special form, dimension of the openings, pores of the filtering elements
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
A filter process and its device consist of a double filtration system, i.e. a superficial filtration by means of coating of a filter medium (M) and an edge filtration by forming a large number of recesses (R) between adjacent wires (14) wrapped round a screw thread portion (12) of the outer circumference of a cylinder (11). The section of the wire is isosceles triangle and the exposed corners (14c) are cut off to form recesses (R) of preferred profile between adjacent wires. Longitudinal passages (13b) and lateral paths (13a) communicate with a cavity inside the cylinder (11). <IMAGE>
Description
SPECIFICATION
A filter process and its device
This invention relates to a filter process and its device which consist of a superficial filtration by means of coating of a filter medium and a cubical filtration by use of an isosceles triangular wire.
Generally, the term "filter" means to remove suspended impurities by passing liquid through any substance such as cloth, paper, porous porcelain or the like. It is required to increase a filtering degree in combination of a filtering paper or a network with a porous sintered metal or a fibre. In order to carry out more accurate filtration, e.g. a filter process as shown in Figure 1 has been introduced conventionally.
A filter device A for superficial filtration comprises a cylinder body 1, a screw thread portion 2 on its outer circumference and a plurality of pores 3 perforated in a zigzag form on the outer circumference. The plurality of pores 3 are communicated with a cavity la of the cylinder 1. Numeral 4 is an approximately isosceles triangular wire having a base 4a, a base surface 4b and a vertical angle a.
The wire 4 is wrapped up round a screw bottom 2b in such a manner that the length e of the base 4a of the wire 4 is slightly smaller than a pitch P between adjacent screw crests 2a, and the vertical angle a of the wire 4 is identical with an angle a between adjacent screw threads. Then, a slit S is formed between adjacent wires 4, 4 and a filter element E is formed, through which a liquid Li containing impurities passes as shown by arrows, and a purified liquid
Lo is produced. A width w of the slit S is obtained by deducting the length e of the base 4a from the pitch
P.
However, one disadvantage of such conventional filter method is that it is not always possible to pass some solid impurities through the filter element E
because the slit S is a lengthy gap. Another dis
advantage thereof is that some liquid impurities may
pass through the filter element E since its passing
area is large. A further disadvantage thereof is that
some screw summits 2a or some screw bottom 2b
may be deformed at an edge 3a where a direction of the screw thread 2 contacts an edge of each pore 3.
Accordingly, the wire 4 is not always uniformly wrapped up above the plurality of pores 3, thereby
the width w of the slit S may be irregular.
In Figure 2 there is shown another conventional filter device B, in which numeral 5 is a porous
stainless steel plate of 5mm~ as the lowest layer,
numeral 6 is a filter paper 6 disposed thereupon and
numeral 7 is a resinous layer precoated on the filter
paper 6. Thus, liquid impurities can be removed one
after another by the resinous layer 7, the filter paper
6 and the porous stainless steel plate 5 respectively.
However, most of the impurities are filtered by the
resinous layer 7 and each pore of the filter paper 6
and the porous stainless steel 5 is small in diamter.
Therefore, the filter paper 6 and the porous stainless steel plate 5 are susceptible of clogging, so that the durability of the filter device B is short-range. In addition, it is not available to use a scraper to prevent clogging and to carry out back-flow cleaning. Further, if the resinous layer 7 is made of powdered resins, it is difficult to recycle it, so that it will be thrown away by one time use.
The task of this invention is to remove the aforementioned disadvantage of the conventional art.
According to one aspect of this invention, a filter process comprises the following steps: forming a screw thread portion on the outer circumference of a cylinder having a plurality of passages communicated with a cavity of said cylinder; wrapping up a summit of an isosceles triangular wire round screw bottoms of said screw thread portion and approximately flattening said screw thread portion; forming a recess of preferred profile between adjacent wires by cutting off respective bottom corners of said adjacent wires; coating a filter medium of fine particles on a base of each wire and in above said recess and forming a multilayer of the filter medium; and carrying out a filter operation by passing a liquid through said multilayer.
According to another aspect of this invention, a filter apparatus comprises the following steps: a cylinder having a plurality of longitudinal passages spaced with each other and formed along the outer periphery of said cylinder, and a plurality of lateral paths communicated with said plurality of longitudinal passages and a cavity of said cylinder; a screw thread portion formed on said outer periphery of said cylinder; a wire of isosceles triangular in section to be wrapped up round screw bottoms of said screw thread portion by inserting a summit of said wire in said screw bottoms; and a recess of preferred profile formed between adjacent wires by cutting off respective corners of said adjacent wires.
This invention will be further described, by way of example, with reference to the accompanying drawings, in which:
Figure 1A is a partial perspective view of a conventional filter device;
Figure 18 is a partial perspective view of a wire which is to be wound up on a screw thread portion of the filter device in Figure 1.
Figure 7C is an expanded section view taken on line lil - ill of the filter device in Figure 1, in which the wire is wound up on the screw thread portion;
Figure 2 is a section view of another conventional filter device;
Figure 3 is a vertical section view of an example of a filter device according to this invention;
Figure 4A is a section view of a wire of which corner is not yet cut off;
Figure 4B is a section view of a wire of which corner is already cut off for practical use;
Figures 5A, 5B, 5C and 5D are modifications of the wires having various sectional profiles as well as the recesses formed between adjacent wires;
Figure 6 is a view of the condition in which particles of a filter medium are adhered to the recesses;;
Figure 7 is a section view of the wire which is wrapped up on one longitudinal passage formed along the outer circumference of a cylinder, and shows a filtration process according to this inven tion.
A preferred example of the invention will be described with reference to Figures 3 to 7.
In Figure 3 there is shown a filter device C according to this invention. The filter device C comprises a cylinder body 11, a screw thread portion 12 on its outer circumference, a plurality of longitudinal passages 13b formed on the outer circumference and spaced with each other, a plurality of lateral paths 13a spaced with each other and communicated with a cavity 11 a and the plurality of longitudinal passages 13b.
Numeral 14 is a metal wire of which material is the same as that of the cylinder body 11. As shown in
Figures 4A and 4B, the section of the wire 14 is isosceles triangle. The wire 14 having a base 14a and a summit 14b is wrapped up round respective screw bottoms 12b of the screw thread portion 12 in such a manner that the summit 14b of the wire 14 is fit in the screw bottom 12b of the screw thread portion 12, and a base portion of the wire 14forms a nearly flattened surface of the cylinder 11. Then, a slit S is formed spirally between adjacent wires 14, and a filter element E1 is formed. Symbol R shows a recess between adjacent wires 14.
Figures 5A to 5D show respective modifications of the recess R, wherein each profile of the wire 14 is pre-determined before mounting it in the screw bottom 12b. For example, in Figure 5A a corner 1 4c of the wire 14 is cut off with an acute angle p. In
Figure 5B the corner 14c is curved. In Figure 5C one corner of the wire 14 is cut off with a different angle x. In Figure 5D one end of the wire 14 is cut off at a right angle relative to the bottom 14a line, while the other end thereof is cut off with the angle p.
Preferably, the material of the cylinder 11 is the same as that of the wire 14. For example, it may be made of the same kind of stainless steel or titanium in order to prevent imbalance of the width w of the slit
S or disengagement between the wire 14 and the screw threads that may be caused by thermal expansion.
A filter process of this invention will be described with reference to Figures 6 and 7.
Prior to the filter process, a filter medium M of fine particles is coated on the surface of the filter element
E1 thereby the particles are formed as a layer m in the recess R.
The filter medium M may be made of the following materials.
(1) Organic substance of starch particles coated with resin.
(2) Particles obtained by pulverizing a hydrophilic and repellent fiber matrix.
(3) Diatomaceous earth particles
(4) Ceramic particles such as alumina particles
(5) Lipophilic and hydrophobic fiber
(6) Stainless steel particles or the like
(7) Chaff charcoal or coconut husk charcoal
Under such circumstances, when a liquid Li containing impurities is fed into the filter element E1,the impurities contained in the liquid Li are filtered by the layer m and then the slits S, thereby a purified liquid Lo is supplied into the cavity 1 1a by way of the longitudinal passages 13b and lateral paths 13a.
In order to increase the filter capacity further, it is desirable to coat the filter medium M in a crosswise or spiral form. Further, when the filter element E, is clogged with the impurities, it is desirable to mount a scraper outside the filter element E1 and actuate it intermittently. Alternatively, it is optional to remove clogging with the impurities by providing ultrasonic vibration while rotating the filter device C or by means of back-flow cleaning.
As described above, the process of this invention includes a first filtration by means of coating of a filter medium and a second filtration by forming a large number of recesses between adjacent wires to be wrapped up round screw bottoms. In other words, the present process consists of a double filtration system, i.e. a superficial filtration and a cubical filtration, thereby the filtering accuracy is enhanced greatly. For example, whereas the width w of the slit S is 10 > , a gap between adjacent particles as the filter medium becomes 1 1ffi. Further, although the filtering area of the slits is narrowed, the coating area is wide, so that the filtering area is enlarged remarkably.
Further, since the filter medium particles m are multilayered as shown in Figure 7, the slit is never opened even if they are slided along the slit S.
As many apparently widely different examples of this invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the specific examples thereof except as defined in the appended
Claims (4)
1. A filter process comprising:
forming a screw thread portion on the outer circumference of a cylinder having a plurality of passages communicated with a cavity of said cylinder;
wrapping up an isosceles triangular wire round screw bottoms of said screw thread portion and nearly flattening said screw thread portion;
forming a recess of preferred profile between adjacent wires by cutting off respective bottom corners of said adjacent wires;
coating a filter medium of fine particles on a base of each wire and in and above said recess and forming a multilayer of the filter medium; and
carrying out a filter operation by passing a liquid through said multilayer.
2. The filter process as described with reference to Figures 3, 4A, 48, 5A, 5B, 5C, 5D, 6 and 7.
3. Afilter device comprising:
a cylinder having a plurality of longitudinal passages spaced with each other and formed along the outer periphery of said cylinder, and a plurality of lateral paths communicated with said plurality of longitudinal passages and a cavity of said cylinder;
a screw thread portion formed on said outer periphery of said cylinder;
a wire of isosceles triangle in section to be wrapped up round screw bottoms of said screw thread portion by inserting a summit of said wire in said screw bottoms; and
a recess of preferred profile formed between adjacent wires by cutting off respective corners of said adjacent wires.
4. The filter device constructed and adapted to operate substantially as herein described with reference to and as illustrated in Figures 3, 4A, 4B, 5A, SB, SC, SD, 6 and 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08503072A GB2170732B (en) | 1985-02-07 | 1985-02-07 | A filter process and its device |
| DE19853504740 DE3504740A1 (en) | 1985-02-07 | 1985-02-12 | Process and filter for filtering liquids |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08503072A GB2170732B (en) | 1985-02-07 | 1985-02-07 | A filter process and its device |
| DE19853504740 DE3504740A1 (en) | 1985-02-07 | 1985-02-12 | Process and filter for filtering liquids |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8503072D0 GB8503072D0 (en) | 1985-03-13 |
| GB2170732A true GB2170732A (en) | 1986-08-13 |
| GB2170732B GB2170732B (en) | 1988-11-30 |
Family
ID=25829317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08503072A Expired GB2170732B (en) | 1985-02-07 | 1985-02-07 | A filter process and its device |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3504740A1 (en) |
| GB (1) | GB2170732B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2203669A (en) * | 1987-04-20 | 1988-10-26 | Arai Machinery Corp | Filter element |
| GB2203961A (en) * | 1987-04-21 | 1988-11-02 | Arai Machinery Corp | Filter element |
| GB2346822A (en) * | 1999-02-18 | 2000-08-23 | Aquafine Corp | Continuous filament matrix for magnetic separator |
| GB2360001A (en) * | 2000-03-07 | 2001-09-12 | Stephen David Rivers | Filter screen for storm water system |
| WO2004043571A1 (en) * | 2002-11-14 | 2004-05-27 | Ryazanov, Dmitry Anatolievich | Filtering element |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19605422A1 (en) * | 1996-02-14 | 1997-08-21 | Passavant Werke | Process for the preparation of drinking water for consumption |
| DE19741905C2 (en) * | 1997-09-23 | 2001-04-19 | Kurt Taupadel | Gap filter element and method for its production |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2084433A (en) * | 1934-10-27 | 1937-06-22 | Chorlton Frank Oscar Levi | Filter, strainer, and the like |
| DE1747431U (en) * | 1954-11-09 | 1957-06-27 | Alfred Knecht | DEVICE FOR SPOOLING EDGE FILTER BODIES. |
| NL7400613A (en) * | 1974-01-17 | 1975-07-21 | Stamicarbon | METHOD AND DEVICE FOR FILTERING MEDIA. |
| DE8135058U1 (en) * | 1981-12-02 | 1982-04-22 | Holstein Und Kappert Gmbh, 4600 Dortmund | SLIT FILTER ELEMENT |
| JPH0625168A (en) * | 1992-07-10 | 1994-02-01 | Nippon Bayeragrochem Kk | Fungicidal benzylpyridines |
-
1985
- 1985-02-07 GB GB08503072A patent/GB2170732B/en not_active Expired
- 1985-02-12 DE DE19853504740 patent/DE3504740A1/en active Granted
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2203669A (en) * | 1987-04-20 | 1988-10-26 | Arai Machinery Corp | Filter element |
| GB2203669B (en) * | 1987-04-20 | 1991-05-22 | Arai Machinery Corp | Filter elements |
| GB2203961A (en) * | 1987-04-21 | 1988-11-02 | Arai Machinery Corp | Filter element |
| GB2203961B (en) * | 1987-04-21 | 1991-05-29 | Arai Machinery Corp | Filter elements |
| GB2346822A (en) * | 1999-02-18 | 2000-08-23 | Aquafine Corp | Continuous filament matrix for magnetic separator |
| US6180005B1 (en) | 1999-02-18 | 2001-01-30 | Aquafine Corporation | Continuous filament matrix for magnetic separator |
| US6224777B1 (en) | 1999-02-18 | 2001-05-01 | Aquafine Corporation | Continuous filament matrix for magnetic separator |
| GB2346822B (en) * | 1999-02-18 | 2002-06-26 | Aquafine Corp | Continuous filament matrix for magnetic separator |
| GB2360001A (en) * | 2000-03-07 | 2001-09-12 | Stephen David Rivers | Filter screen for storm water system |
| GB2360001B (en) * | 2000-03-07 | 2002-09-04 | Stephen David Rivers | Storm water screen |
| WO2004043571A1 (en) * | 2002-11-14 | 2004-05-27 | Ryazanov, Dmitry Anatolievich | Filtering element |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3504740C2 (en) | 1987-09-17 |
| GB8503072D0 (en) | 1985-03-13 |
| DE3504740A1 (en) | 1986-08-14 |
| GB2170732B (en) | 1988-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960207 |