US5003145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inductively operated heating apparatus for plastic materials
Assignee: E Blum GmbH and Co
•
Filing: 1989-12-15
•
Granted: 1991-03-26
•
Expires: 2009-12-15
Abstract
Abstract An inductively operated apparatus for heating plastic materials in extruders or for other purposes has a heat-transmitting housing with one or more passages for the material or materials to be heated, and an arrangement for heating the housing. The heating arrangement employs a laminated core with two legs which are magnetically coupled to the housing with the interposition of distancing elements of heat insulating material. The core is surrounded by an exciting coil. In order to prevent overheating of the coil, the heating arrangement further comprises at least one barrier which is interposed between the core and the core and is cooled by one or more streams of a gaseous or liquid coolant, such as water. The barrier can be constituted by a flat tube which is convoluted around the core and supports the coil. A second barrier can be placed around the coil so that the latter is received between two barriers. Alternatively, the barrier can employ a vessel which confines the coil, and a fluid-conveying conduit which draws heat from the vessel.
Inventors
- 👤 Eugen Nolle
- 👤 Hugo-Werner Geschka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:09
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/42; B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/83; B29C48/832; H05B6/10; H05B6/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
An inductively operated heating apparatus for plastic materials and the like, comprising a heat-transmitting housing having at least one passage for the material to be heated; and means for heating said housing including at least one laminated iron core which is magnetically coupled to said housing, said at least one core defining an open magnetic circuit and said circuit being completed by said housing, at least one coil surrounding at least a portion of said at least one core, and at least one fluid-cooled thermally conductive barrier which carries said at least one coil and is disposed between said at least one core and said at least one coil.
Claim 2
Dependent Claim
109 words
An inductively operated heating apparatus for plastic materials and the like, comprising a heat-transmitting housing having at least one passage for the material to be heated; and means for heating said housing including at least one laminated iron core which is magnetically coupled to said housing, said at least one core defining an open magnetic circuit and said circuit being completed by said housing, at least one coil surrounding at least a portion of said at least one core, and at least one fluid-cooled thermally conductive barrier which carries said at least one coil and is disposed between said at least one core and said at least one coil.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1, wherein said at least one barrier has a plurality of convolutions between said at least one coil and said at least one core.
Claim 4
Dependent Claim
18 words
The apparatus of claim 2, wherein said convolutions form part of a tube having a polygonal cross-sectional outline.
Claim 5
Dependent Claim
14 words
The apparatus of claim 3, wherein said tube has a substantially rectangular cross-sectional outline.
Claim 6
Dependent Claim
20 words
The apparatus of claim 1, further comprising a second barrier, said at least one coil being disposed between said barriers.
Claim 7
Dependent Claim
17 words
The apparatus of claim 5, wherein at least one of said barriers comprises a plurality of convolutions.
Claim 8
Dependent Claim
26 words
The apparatus of claim 1, wherein said at least one barrier includes a vessel for said at least one coil and means for cooling said vessel.
Claim 9
Dependent Claim
21 words
The apparatus of claim 7, wherein said cooling means comprises at least one coolantconveying conduit which exchanges heat with said vessel.
Claim 10
Dependent Claim
18 words
The apparatus of claim 7, wherein said vessel includes means for preventing the development of eddy currents therein.
Claim 11
Dependent Claim
17 words
The apparatus of claim 9, wherein said preventing means has at least one void in said vessel.
Claim 12
Dependent Claim
14 words
The apparatus of claim 10, wherein said at least one void is a slot.
Claim 13
Dependent Claim
14 words
The apparatus of claim 10, wherein said at least one void is an opening.
Claim 14
Dependent Claim
49 words
The apparatus of claim 1, wherein said at least one core has two end portions adjacent said housing and further comprising a body of electrically insulating material confining said at least one coil, said at least one barrier and said at least one core save for said end portions.
Claim 15
Dependent Claim
13 words
The apparatus of claim 13, wherein said body includes a hardened insulating compound.
Claim 16
Dependent Claim
19 words
The apparatus of claim 1, further comprising distancing means interposed between said at least one core and said housing.
Claim 17
Dependent Claim
16 words
The apparatus of claim 15, wherein said distancing means consists of or contains a heatinsulating material.
References Cited (Backward Citations)
US3028566A
Cited
US3764767A
Cited
US3902146A
Cited
US4247736A
Cited
US4317979A
Cited
US4673781A
Cited
US4761528A
Cited
US4856097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |