Electric Heating Device with Tolerance PTC Heating Element
First Claim
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1. An auxiliary electric heater for a motor vehicle, comprising:
- a plurality of heat stages with at least one PTC heating element each, all of the PTC heating elements having the same, first rated heating power, and a plurality of radiator elements for dissipating the generated heat to a medium flowing through the radiator elements, wherein at least one of the heat stages contains a tolerance PTC heating element with a second rated heating power for correcting departures of the heating power of the at least one PTC heating element from the first rated heating power due to differences in manufacture, the second rated heating power being lower than the first rated heating power.
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Abstract
For avoiding the selection and storage of PTC heating elements with different departures from rated heating power, additional tolerance PTC heating elements are held ready which uniformly have a lower rated heating power, preferably one half or third of the rated heating power, compared to the standard or primary PTC heating element. By the use of a second standardized heating element, i. e. the tolerance PTC heating element, the storage of a high number of PTC heating elements with different departures can be dispensed with and a cheaper manufacture can be permitted.
18 Citations
23 Claims
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1. An auxiliary electric heater for a motor vehicle, comprising:
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a plurality of heat stages with at least one PTC heating element each, all of the PTC heating elements having the same, first rated heating power, and a plurality of radiator elements for dissipating the generated heat to a medium flowing through the radiator elements, wherein at least one of the heat stages contains a tolerance PTC heating element with a second rated heating power for correcting departures of the heating power of the at least one PTC heating element from the first rated heating power due to differences in manufacture, the second rated heating power being lower than the first rated heating power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An auxiliary electric heater for a motor vehicle, comprising:
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a plurality of heat stages each having at least one primary PTC heating element each, all of the primary PTC heating elements having the same, first rated heating power, wherein at least one of the heat stages contains a tolerance PTC heating element with a second rated heating power, the tolerance PTC heating element correcting departures of the heating power of the at least one primary PTC heating element from the first rated heating power, the second rated heating power being lower than the first rated heating power, and a plurality of radiator elements that dissipate the heat generated by the heat stages to a medium flowing through the radiator elements. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A process comprising the steps of:
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a. assembling an electric heater to form a layered structure of a plurality of alternating levels of PTC heating elements and radiator elements, wherein each of the levels with PTC heating elements comprises at least one primary PTC heating element, and wherein all of the primary PTC heating elements have the same, first rated heating power; and
b. compensating for departures from an actual heating power of the PTC heating elements of each level by inserting at least one tolerance PTC heating element in the level, the tolerance PTC heating element having a second rated heating power that is lower than the first rated heating power. - View Dependent Claims (22, 23)
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Specification