Electrical heater with temperature cutout
阅读：758发布：2023-10-28
专利汇可以提供Electrical heater with temperature cutout专利检索，专利查询，专利分析的服务。并且A temperature cutout for an electrical heater of the cartridge type having a resistance element wound on an insulating core disposed within a metal sheath and surrounded by insulating material, a first conductor in electrical contact with said resistance element and a second conductor freely disposed within said core, having one end portion normally in electrical contact with said first conductor, said second conductor having a relatively lower coefficient of expansion than said sheath and being sized electrically for self-heating and axial extension and retraction responsive to the current flow, whereby upon attaining a preselected first temperature during heating, contact between said conductors will be broken and said second conductor will cool and contract for rapidly separating said conductors; and upon reaching a relatively lower second temperature during cooling, contact between conductors will be reestablished and said second conductor will heat and extend for rapidly engaging said conductor so that cycling is reduced and arcing is substantially eliminated.，下面是Electrical heater with temperature cutout专利的具体信息内容。
1. An electrical heater comprising a metal sheath, an insulating core disposed within said sheath, first conductor means provided with said core, second conductor means provided with said core, each of said first and second conductor means having an inner terminal and an outer terminal, a source of power, the outer terminal of each conductor means being in circuit with said source of power for supplying current through said conductor means, the inner terminal of each conductor means being normally in electrical contact, one of said conductor means having a length sized electrically for axial extension and retraction responsive to current flow therethrough, and said sheath and one of said conductor means being differentially temperature responsive for effecting disengagement of said inner terminals upon attainment of a predetermined temperature.
2. An electrical device as defined in claim 1 and further characterized by said second conductor means being slidably disposed within said core for relative movement therein responsive to temperature and current flow for effecting substantially instantaneous engagement and disengagement of said inner terminals.
3. An electrical device as defined in claim 2 and further characterized by a tube positioned within said core, said second conductor means received within said tube, said tube having an inner diameter greater than the diameter of said second conductor means for permitting slideable movement therein.
4. An electrical device as defined in claim 3 and further characterized by said second conductor means being bimetallic, having a first portion and a second portion, said first portion being fabricated of a relatively low expansive metal, and said second portion being fabricated of a relatively high expansive metal.
5. An electrical device as defined in claim 4 and further characterized by said first portion being comprised of molybdenum and said second portion being comprised of nichrome.
6. An electrical device as defined in claim 4 and further characterized by said first portion being comprised of invar and said second portion being comprised of nichrome.
7. An electrical device as defined in claim 4 and further characterized by said second conductor means having a coefficient of expansion relatively less than that of said sheath so that as the temperature of the heater increases, the sheath will expand at a greater rate than said second conductor means for effecting disengagement of the inner terminals of said first and second conductor means upon attainment of a predetermined temperature.
8. An electrical device as defined in claim 2 and further characterized by said sheath having a closed end, said insulating core being positioned spacedly from said closed end for defining a compartment, the inner terminals of each first and second conductor means projecting into compartment, said first conductor inner terminal having a hook portion, a contact on said hook portion being axially aligned with said second conductor means.
9. An electrical device as defined in claim 8 and further characterized by said first conductor means comprising a resistance element wound around said core, said resistance element having opposite ends, a first pin constituting said inner terminal within said core engaging one end of said resistance element and projecting into said compartment, a second pin constituting said outer terminal within said core engaging the other resistance element end and projecting endwise of said sheath.
10. An electrical device as defined in claim 4 and further characterized by said second portion having a length and diameter sized electrically for effecting axial extension and retraction responsive to current flow.
11. An electrical device as defined in claim 3 and further characterized by said first conductor means including a resistance element wound around said core; said second conductor means comprising a first portion having a length positioned within said core and a second portion having a length projecting beyond said core; said first portion being axially extended and retracted responsive to the temperature of said resistance element, and said second portion being axially extended and retracted responsive to the current flow therethrough.
12. An electrical device as defined in claim 11 and further characterized by said second conductor means being bimetallic said first portion being fabricated from a relatively low expansive metal, and said second portion being fabricated from a relatively high expansive metal.
13. An electrical device as defined in claim 2 and further characterized by said first conductor means including a resistance element wound around said insulating core, said resistance element having end portions presented at opposite ends of said insulating core, the inner and outer terminals of said first conductor means engaging the related end portions of said resistance element, a spacer core disposed within said sheath and receiving said outer terminals of said first and second conductor means; said second conductor means having a first portion and a second portion, said second portion of said second conductor means constituting said current sensitive portion and being located within said spacer core so as to be unaffected by the sheath temperature.
14. An electrical heater comprising a metal sheath, an insulating core disposed within said sheath, a resistance heater element wound around said insulating core, said resistance heater element having end portions presented at opposite ends of said insulating core, first conductor means provided with said core, second conductor means provided with said core, each of said first and second conductor means having an inner terminal and an outer terminal, the inner and outer terminals of said first conductor means being in electrical contact with related end portions of said resistance element, a source of power, the outer terminal of each conductor means being in circuit with said source of power for supplying current through said conductor means, said conductor means being slidably engageable relative to one another, the inner terminal of each conductor means being normally in electrical contact, one of said conductor means having a length including a first current sensitive portion having a greater resistivity and a smaller diameter than a second portion thereof for effecting axial extensioN and retraction of said conductor means responsive to current flow therethrough, and said sheath and one of said conductor means being differentially temperature responsive for effecting disengagement of said inner terminals upon attainment of a predetermined temperature.
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