| 摘要 |
The heating device (10) has an inner metal case (11) and an outer metal case (14) arranged with respect to each other such that a space is formed between the inner and outer metal cases and filled with powder or granulated material e.g. magnesium oxide, glass sand and ceramic compound. A heat conductor (13) is arranged in the space between the inner and outer cases. Two spacers (12) are arranged between the heat conductor and the inner metal case and guided over a section of the heat conductor. The spacers are formed from electrically insulated material. |
