US3581898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic filter
Assignee: US Philips Corp
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Filing: 1969-05-19
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Granted: 1971-06-01
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Expires: 1989-05-19
Abstract
Abstract A magnetic filter for use in a pipeline which separates ferromagnetic particles from the fluid within the pipeline. Filtering grids arranged within two pipes are energized by externally surrounding coils, such that the flux generated in one pipe is carried by the other pipe.
Inventors
- 👤 Arthur James Tyrrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:44
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/025; B01; B01D; B01D35/00; B01D35/02; B01D35/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
247 words
A magnetic filter for separating ferromagnetic particles from a fluid comprising a pair of conduit pipes arranged side-by-side for passing therethrough the fluid to be filtered, said pipes being made of ferromagnetic material, upper and lower yoke members of ferromagnetic material clamped about said pipes for connecting said pipes in a rigid parallel relationship, a pair of slotted gratings of ferromagnetic material secured within each of said pipes said gratings being axially spaced apart positioned parallel to each other and oriented in a plane perpendicular to the longitudinal axis of each pipe, a plurality of filtering grids carried within each of said pipes between said gratings, each of said grids comprising a plurality of screen elements comprising parallel strips of ferromagnetic material having spaces therebetween and a plurality of nonferromagnetic support bars arranged perpendicular to said strips being secured thereto to form a rigid screen element, said screen elements being positioned parallel to each other and oriented in planes perpendicular to the plane of said gratings so that said supporting bars extend in a direction parallel to the longitudinal axis of said pipes, and means for inducing a magnetic field in said grids whereby said ferromagnetic particles will be attracted to and trapped in said screen elements, said means comprising a plurality of energizing coils surrounding each of said pipes and means for energizing said coils so that a magnetic circuit is established whereby the flux generated in one pipe will be carried by the other pipe.
Claim 2
Dependent Claim
247 words
A magnetic filter for separating ferromagnetic particles from a fluid comprising a pair of conduit pipes arranged side-by-side for passing therethrough the fluid to be filtered, said pipes being made of ferromagnetic material, upper and lower yoke members of ferromagnetic material clamped about said pipes for connecting said pipes in a rigid parallel relationship, a pair of slotted gratings of ferromagnetic material secured within each of said pipes said gratings being axially spaced apart positioned parallel to each other and oriented in a plane perpendicular to the longitudinal axis of each pipe, a plurality of filtering grids carried within each of said pipes between said gratings, each of said grids comprising a plurality of screen elements comprising parallel strips of ferromagnetic material having spaces therebetween and a plurality of nonferromagnetic support bars arranged perpendicular to said strips being secured thereto to form a rigid screen element, said screen elements being positioned parallel to each other and oriented in planes perpendicular to the plane of said gratings so that said supporting bars extend in a direction parallel to the longitudinal axis of said pipes, and means for inducing a magnetic field in said grids whereby said ferromagnetic particles will be attracted to and trapped in said screen elements, said means comprising a plurality of energizing coils surrounding each of said pipes and means for energizing said coils so that a magnetic circuit is established whereby the flux generated in one pipe will be carried by the other pipe.
Claim 3
Dependent Claim
69 words
The magnetic filter according to claim 1, wherein said energizing coils comprises two strips of electrically conductive material each of said strips being wound in a flat spiral arrangement of opposite directions, said spiral strips being covered with insulating material and coaxially arranged, the inner ends of said spirally wound strips being connected together, the outer ends of said strips being connected with the outer ends of adjacent coils.
Claim 4
Dependent Claim
81 words
The magnetic filter as claimed in claim 2, wherein the coils surrounding each pipe are held in position by spacer rings each formed on one side with a rebate which extends about the outer periphery of the ring, the rings being arranged in the pipe in contact with one another and with the rebates in adjacent rings facing in opposite directions so that the rebate in successive pairs of adjacent rings form grooves for receiving the inner peripheries of the coils.
Claim 5
Dependent Claim
18 words
The magnetic filter as claimed in claim 3, wherein the spacer rings are made of a heat-insulating material.
Claim 6
Dependent Claim
43 words
The magnetic filter as claimed in claim 4, further comprising means for cooling the coils when high-temperature fluids are passed through the pipes, said means comprising a fan and ducting which enshrouds the coils so as to direct the forced air over them.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |