CA1062170A - Magnetic filter element - Google Patents
Magnetic filter elementInfo
- Publication number
- CA1062170A CA1062170A CA256,539A CA256539A CA1062170A CA 1062170 A CA1062170 A CA 1062170A CA 256539 A CA256539 A CA 256539A CA 1062170 A CA1062170 A CA 1062170A
- Authority
- CA
- Canada
- Prior art keywords
- filter element
- magnetic
- fluid
- inches
- filter
- 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.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 239000006249 magnetic particle Substances 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 9
- 239000000696 magnetic material Substances 0.000 abstract description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/06—Filters making use of electricity or magnetism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/28—Magnetic plugs and dipsticks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
Abstract
MAGNETIC FILTER ELEMENT
ABSTRACT
A magnetic filter element for removing ferrous particles from a fluid includes a member constructed from a flexible magnetic material and has a multiplicity of holes formed therein for the fluid to pass therethrough.
ABSTRACT
A magnetic filter element for removing ferrous particles from a fluid includes a member constructed from a flexible magnetic material and has a multiplicity of holes formed therein for the fluid to pass therethrough.
Description
Background of the Invention This invention relates to filters and more particu-larly to a magnetic filter element for removing magnetic par-ticles from fluids used as a lubricant or in hydraulic systems.
Magnetic filters have been used for many years in fluid systems in combination with a pleated paper filter ele-ment for removing microscopic ferrous particles that pass through the paper element thereby increasing the life of the hydraulic system components. However, heretofore such magnetic filters have been constructed with conventional bar or ring magnets and are difficult to clean. Furthermore, the bar and ring magnets increase the cost of the filter such that it be-comes too expensive to be replaced on the same replacement schedule of standard oil filters.
In accordance with the invention, a magnetic filter element for removing ferromagnetic particles from a fluid com-prises a tubular cylinder of flexible permanently magnetised sheet material having a multiplicity of holes formed therein for the fluid to pass through, each hole having a diameter .
within the range from 0.25 inches to 0.38 inches and the holes providing a hole circumference to filter area ratio in the range from 5 inches to 7 inches per square inch.
This new magnetic filter element may be inexpensive to manufacture and could be used as a "throw-away" type of filter to be replaced at regular intervals. The element could be used as a separate filter for filtering ferromagnetic par-ticles from a fluid in combination with a conventional oil ;
filter which filters the nonmagnetic particles from the fluid.
Alternatively, it could be used as an integral part of a fil-ter assembly which includes a conventional porous filtering element.
Magnetic filters have been used for many years in fluid systems in combination with a pleated paper filter ele-ment for removing microscopic ferrous particles that pass through the paper element thereby increasing the life of the hydraulic system components. However, heretofore such magnetic filters have been constructed with conventional bar or ring magnets and are difficult to clean. Furthermore, the bar and ring magnets increase the cost of the filter such that it be-comes too expensive to be replaced on the same replacement schedule of standard oil filters.
In accordance with the invention, a magnetic filter element for removing ferromagnetic particles from a fluid com-prises a tubular cylinder of flexible permanently magnetised sheet material having a multiplicity of holes formed therein for the fluid to pass through, each hole having a diameter .
within the range from 0.25 inches to 0.38 inches and the holes providing a hole circumference to filter area ratio in the range from 5 inches to 7 inches per square inch.
This new magnetic filter element may be inexpensive to manufacture and could be used as a "throw-away" type of filter to be replaced at regular intervals. The element could be used as a separate filter for filtering ferromagnetic par-ticles from a fluid in combination with a conventional oil ;
filter which filters the nonmagnetic particles from the fluid.
Alternatively, it could be used as an integral part of a fil-ter assembly which includes a conventional porous filtering element.
-2-Some examples of filter elements constructed in accordance with the invention are illustrated in the accom-panying drawings in which:-Fig. 1 is a vertical section through one magnetic5 filter element in association with a filter assembly;
Fig. 2 is an elevation of the magnetic filter ele-ment at an intermediate step in its construction; and, Fig. 3 is another example of magnetic filter element.
Referring now to the drawings, a magnetic filter 10 element embodying the principles of the present invention is ~ -~
generally indicated by the reference numeral 10 in association with a filter assembly 11. The filter assembly includes a housing 12 having a generally cylindrical sidewall 13, an end wall 14 integrally secured at one end of the sidewall and a cover 16 removably secured to the opposite end of the sidewall by a plurality of bolts 17. A pair of centrally disposed pro-jections 18 and 19 extend inwardly from the end wall and cover, respectively. A first port 21 extends through the end wall and projection 18 and receives the end of a tube 22 while a second port 23 extends through the sidewall adjacent to the cover and receives the end of a tube 24. An elongated pleated paper filter element 25 is disposed within the housing with its opposite ends disposed in sealing engagement with the end wall and cover. The filter element 25 has an axially extend-ing passage 26 formed therein.
1~
.
J
1'7~
The magnetic filter element 10 of the present invention includes an elongated tubular member 27 of flexible magnetic material having a relatively thin wall thickness.
The tubular member is disposed within the passage 26 of the filter element 25 with the pro~ections 18 and 19 sealingly protruding into ~he opposite ends of the tubular member. A
multiplicity of holes 28 extend through the wall of the tubular member.
One method of making the magnetic filter element is to machine a multiplicity of holes 28 in a flat strip or sheet of the ~lexible magnetic material as shown in Fig. 2.
The sheets of flexible magnetic material are commonly formed by dispersing magnetically anisotropic particles in a non-magnetic immobilizing matrix material such as rubber, plastic or the like. One method of making the flexible magnetic ; material is described in the U.S. Patent 2,999,275 issued to W. S. Blume, Jr. on September 12, 1961. After the holes have been machined in the strip, it is formed into a cylindrical shape with its ad~acent edges then fastened together in any suitable manner such as rivetting, stapling, or the like.
In one type of filtering operation, the fluid to be filtered is pumped through the tube 22 into the center of the tubular member 27 where it passes radially outwardly through the holes 28. The magnetic attraction of the tubular member attracts and retains any ferrous particles carried by the fluid. The fluid then passes through the pleated paper filter element 26 which filters out the nonmagnetic particles with the filtered fluid then being exhausted through the port 23 and tube 24. Alternately, the fluid flow could be reverséd so that the fluid enters through the port 23, .
17(~
passes through the paper filter element and the holes in the tubular member with the fluid then being exhausted through the port 21 and tube 22. Thus, the magnetic filter element would attract only the microscopic ferrous particles that pass through the pleated paper element.
An alternate embodiment of the magnetic filter element 10 of the present invention is disclosed in Fig. 3.
In this embodiment, however, the magnetic filter element is in the form of a perforated wrapper constructed from the flexible magnetic material with the wrapper encircling a pleated paper filter element 32 as an integral part of a ; fluid filter 33. The fluid filter may be employed within a housing similar to that described above.
The magnetic filter element 10 of the present invention may also be utilized in the flat form shown in ; Fig. 2 by placing it in the flow path so that the fluid passes through the holes 28. One example of such use would be to insert such a flat magnetic filter element within the fluid tank between the inlet and outlet ports.
The size of the holes 28 is selected to maintain a minimal pressure drop in the fluid passing through the filter element 10 and is dependent upon flow rate of the fluid. Typically, the diameter d of the holes will be withln the range of from approximately 0.25 inches to Q.38 inches with the hole pattern selected to provide a hole circumference length to filter area ratio within the range of approximately 5 to 7 inches per square inch. The filter area includes the area of the holes plus the surface area of the magnetic material. For example, the hole pattern shown in Fig. 2 provides a circumference length to area ratio of _5_ , .
5.99 inches per square inch when the diameter d is 0.31 inches, the dimension A is 0.43 and the dimension B is 0.38.
In view of the foregoing, it is readily apparent that the structure of the present invention provides an improved magnetic filter element which can be economically manufactured to provide a throw-away magnetic filter. The magnetic filter element is made from a flexible magnetic material which is commercially available in inexpensive sheet form. The flexible magnetic material can be readily formed into a tubular shape as an independent filter element or as a wrapper which is an integral part of a fluid filter.
Since all the fluid passes through the holes in the filter element, any magnetic particles carried in the fluid is forced to pass through the magnetic field of the magnetic filter element and is attracted thereto. Thus, the magnetic filter element is very efficient in removing magnetic particles from the fluid.
While the invention has been described and shown with particular reference to the preferred embodiments, it will be apparent that variations might be possible that would fall within the scope of the present invention which i5 not intended to be limited except as defined in the following claims.
. . ,, , . . ' ' ' .
Fig. 2 is an elevation of the magnetic filter ele-ment at an intermediate step in its construction; and, Fig. 3 is another example of magnetic filter element.
Referring now to the drawings, a magnetic filter 10 element embodying the principles of the present invention is ~ -~
generally indicated by the reference numeral 10 in association with a filter assembly 11. The filter assembly includes a housing 12 having a generally cylindrical sidewall 13, an end wall 14 integrally secured at one end of the sidewall and a cover 16 removably secured to the opposite end of the sidewall by a plurality of bolts 17. A pair of centrally disposed pro-jections 18 and 19 extend inwardly from the end wall and cover, respectively. A first port 21 extends through the end wall and projection 18 and receives the end of a tube 22 while a second port 23 extends through the sidewall adjacent to the cover and receives the end of a tube 24. An elongated pleated paper filter element 25 is disposed within the housing with its opposite ends disposed in sealing engagement with the end wall and cover. The filter element 25 has an axially extend-ing passage 26 formed therein.
1~
.
J
1'7~
The magnetic filter element 10 of the present invention includes an elongated tubular member 27 of flexible magnetic material having a relatively thin wall thickness.
The tubular member is disposed within the passage 26 of the filter element 25 with the pro~ections 18 and 19 sealingly protruding into ~he opposite ends of the tubular member. A
multiplicity of holes 28 extend through the wall of the tubular member.
One method of making the magnetic filter element is to machine a multiplicity of holes 28 in a flat strip or sheet of the ~lexible magnetic material as shown in Fig. 2.
The sheets of flexible magnetic material are commonly formed by dispersing magnetically anisotropic particles in a non-magnetic immobilizing matrix material such as rubber, plastic or the like. One method of making the flexible magnetic ; material is described in the U.S. Patent 2,999,275 issued to W. S. Blume, Jr. on September 12, 1961. After the holes have been machined in the strip, it is formed into a cylindrical shape with its ad~acent edges then fastened together in any suitable manner such as rivetting, stapling, or the like.
In one type of filtering operation, the fluid to be filtered is pumped through the tube 22 into the center of the tubular member 27 where it passes radially outwardly through the holes 28. The magnetic attraction of the tubular member attracts and retains any ferrous particles carried by the fluid. The fluid then passes through the pleated paper filter element 26 which filters out the nonmagnetic particles with the filtered fluid then being exhausted through the port 23 and tube 24. Alternately, the fluid flow could be reverséd so that the fluid enters through the port 23, .
17(~
passes through the paper filter element and the holes in the tubular member with the fluid then being exhausted through the port 21 and tube 22. Thus, the magnetic filter element would attract only the microscopic ferrous particles that pass through the pleated paper element.
An alternate embodiment of the magnetic filter element 10 of the present invention is disclosed in Fig. 3.
In this embodiment, however, the magnetic filter element is in the form of a perforated wrapper constructed from the flexible magnetic material with the wrapper encircling a pleated paper filter element 32 as an integral part of a ; fluid filter 33. The fluid filter may be employed within a housing similar to that described above.
The magnetic filter element 10 of the present invention may also be utilized in the flat form shown in ; Fig. 2 by placing it in the flow path so that the fluid passes through the holes 28. One example of such use would be to insert such a flat magnetic filter element within the fluid tank between the inlet and outlet ports.
The size of the holes 28 is selected to maintain a minimal pressure drop in the fluid passing through the filter element 10 and is dependent upon flow rate of the fluid. Typically, the diameter d of the holes will be withln the range of from approximately 0.25 inches to Q.38 inches with the hole pattern selected to provide a hole circumference length to filter area ratio within the range of approximately 5 to 7 inches per square inch. The filter area includes the area of the holes plus the surface area of the magnetic material. For example, the hole pattern shown in Fig. 2 provides a circumference length to area ratio of _5_ , .
5.99 inches per square inch when the diameter d is 0.31 inches, the dimension A is 0.43 and the dimension B is 0.38.
In view of the foregoing, it is readily apparent that the structure of the present invention provides an improved magnetic filter element which can be economically manufactured to provide a throw-away magnetic filter. The magnetic filter element is made from a flexible magnetic material which is commercially available in inexpensive sheet form. The flexible magnetic material can be readily formed into a tubular shape as an independent filter element or as a wrapper which is an integral part of a fluid filter.
Since all the fluid passes through the holes in the filter element, any magnetic particles carried in the fluid is forced to pass through the magnetic field of the magnetic filter element and is attracted thereto. Thus, the magnetic filter element is very efficient in removing magnetic particles from the fluid.
While the invention has been described and shown with particular reference to the preferred embodiments, it will be apparent that variations might be possible that would fall within the scope of the present invention which i5 not intended to be limited except as defined in the following claims.
. . ,, , . . ' ' ' .
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A magnetic filter element for removing ferro-magnetic particles from a fluid, the element comprising a tubular cylinder of flexible permanently magnetised sheet material having a multiplicity of holes formed therein for the fluid to pass through, each hole having a diameter within the range from 0.25 inches to 0.38 inches and the holes pro-viding a hole circumference to filter area ratio in the range from 5 inches to 7 inches per square inch.
2. A magnetic filter element according to claim 1, wherein the hole diameter is substantially 0.31 inches and the hole circumference to filter area ratio is substantially 5.99 inches per square inch.
3. A filter assembly comprising a magnetic fil-ter element according to claim 1, mounted coaxially with a tubular cylindrical porous filter element.
4. A filter assembly according to claim 3, in which the porous filter element is permanently wrapped within the magnetic filter element.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US62319775A | 1975-10-16 | 1975-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062170A true CA1062170A (en) | 1979-09-11 |
Family
ID=24497145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA256,539A Expired CA1062170A (en) | 1975-10-16 | 1976-07-07 | Magnetic filter element |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5250067A (en) |
| BE (1) | BE846690A (en) |
| CA (1) | CA1062170A (en) |
| GB (1) | GB1498375A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982219A (en) * | 2010-09-07 | 2011-03-02 | 苏州世名科技股份有限公司 | Basket wet process filtering and deironing integration device |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151511B (en) * | 1983-12-22 | 1987-06-10 | Dr James Henry Peter Watson | Method of magnetically filtering radioactive particles from air or other fluids |
| GB8420668D0 (en) * | 1984-08-14 | 1984-09-19 | Int Research & Dev Co Ltd | Magnetic filter |
| JPH0632163Y2 (en) * | 1988-01-29 | 1994-08-24 | 株式会社土屋製作所 | Oil filter element |
| JPH0513366Y2 (en) * | 1988-12-15 | 1993-04-08 | ||
| WO2011155431A1 (en) * | 2010-06-08 | 2011-12-15 | インテグリス・インコーポレーテッド | Magnetic filter and impurity-collection method using same |
| DE102010035981A1 (en) * | 2010-09-01 | 2012-03-01 | Hydac Filtertechnik Gmbh | Component for a filter unit for the filtration of fluids and method for producing such a component |
| JP6121844B2 (en) * | 2013-08-13 | 2017-04-26 | 株式会社東芝 | Magnet filter |
| EP3311901B1 (en) * | 2016-10-19 | 2021-04-21 | Hydac Filtertechnik GmbH | Filter element with a permanent magnetic film and corresponding filter cassette |
| CN113350901B (en) * | 2021-05-06 | 2022-11-18 | 江苏中康环保装备有限公司 | Formula of wafing industrial workshop high dust exhaust filtration equipment |
-
1976
- 1976-06-10 GB GB24000/76A patent/GB1498375A/en not_active Expired
- 1976-07-07 CA CA256,539A patent/CA1062170A/en not_active Expired
- 1976-09-29 BE BE1007655A patent/BE846690A/en unknown
- 1976-10-07 JP JP51119905A patent/JPS5250067A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982219A (en) * | 2010-09-07 | 2011-03-02 | 苏州世名科技股份有限公司 | Basket wet process filtering and deironing integration device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1498375A (en) | 1978-01-18 |
| JPS5250067A (en) | 1977-04-21 |
| BE846690A (en) | 1977-03-29 |
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