Temperature-dependent switch
View Patent ↗A temperature-dependent switch having a switch housing, a temperature-dependent switching mechanism and a heating resistor component. The switch housing comprises a lower part made of electrically conductive material and a lid part which comprises a first section made of electrically conductive material and a second section made of electrically insulating material. The temperature-dependent switching mechanism comprises a movable contact part that establishes a first electrical connection between the lower part and a stationary contact part below a response temperature and interrupts the first electrical connection upon exceeding the response temperature. The heating resistor component is arranged inside the switch housing between the lid part and the lower part. The heating resistor component is electrically connected in series with the lower part and the first section of the lid part and electrically in parallel with the first electrical connection. The heating resistor component is arranged at a distance from the stationary contact part.
1 . A temperature-dependent switch, comprising:
a switch housing having a lower part that comprises an electrically conductive material, and a lid part that closes the lower part and comprises a first section and a second section fixed to the first section, the first section comprising an electrically conductive material, on which a stationary contact part is arranged, and the second section comprising an electrically insulating material and being in contact with the lower part;
a temperature-dependent switching mechanism comprising a movable contact part and being configured to switch, upon exceeding a response temperature, from a closed position, in which the temperature-dependent switching mechanism establishes a first electrical connection between the lower part and the stationary contact part by pressing the movable contact part against the stationary contact part, to an open position, in which the temperature-dependent switching mechanism interrupts the first electrical connection by lifting the movable contact part off the stationary contact part; and
a heating resistor component arranged inside the switch housing between the lid part and the lower part and being enclosed by the switch housing, wherein the heating resistor component is electrically connected in series with the lower part and the first section of the lid part and electrically in parallel with the first electrical connection, and wherein the heating resistor component is arranged at a distance from the stationary contact part;
wherein the heating resistor component rests with its bottom side facing the temperature-dependent switching mechanism on a circumferential shoulder, and wherein the first section and the second section of the lid part rest on and are in direct contact with a planar top side of the heating resistor component opposite the bottom side.
2 . The temperature-dependent switch according to claim 1 , wherein the heating resistor component comprises a ring part on which the lid part rests, the ring part comprising a ring opening through which the movable contact part presses against the stationary contact part in order to establish the first electrical connection between the lower part and the stationary contact part in the closed position.
3 . The temperature-dependent switch according to claim 1 , wherein the heating resistor component is clamped between the lid part and the lower part.
4 . The temperature-dependent switch according to claim 1 , wherein the heating resistor component is in direct contact with the lid part and the lower part, respectively.
5 . The temperature-dependent switch according to claim 1 , wherein the heating resistor component comprises a PTC material.
6 . The temperature-dependent switch according to claim 1 , wherein the temperature-dependent switching mechanism comprises a switching mechanism unit, which comprises the movable contact part and a bimetal snap-action disc coupled with the movable contact part, and a switching mechanism housing, in which the switching mechanism unit is arranged and held captively, wherein the switching mechanism housing is arranged in the switch housing.
7 . The temperature-dependent switch according to claim 6 , wherein the bimetal snap-action disc is configured to snap from a low-temperature configuration into a high-temperature configuration upon exceeding the response temperature, and wherein the bimetal snap-action disc in its high-temperature configuration is supported on a first support surface, which is arranged on an inner side of the switching mechanism housing facing the switching mechanism unit.
8 . The temperature-dependent switch according to claim 6 , wherein the switching mechanism unit further comprises a snap-action spring disc which is coupled to the movable contact part and which is, in the closed position, supported on a second support surface arranged on an inner side of the switching mechanism housing facing the switching mechanism unit.
9 . The temperature-dependent switch according to claim 6 , wherein the switching mechanism housing comprises a base body which surrounds the switching mechanism unit from a first housing side, a second housing side opposite the first housing side and a housing circumferential side extending between and transversely to the first and second housing sides, wherein the base body has an opening on the first housing side, through which the movable contact part presses against the stationary contact part in order to establish the first electrical connection between the lower part and the stationary contact part in the closed position.
10 . The temperature-dependent switch according to claim 9 , wherein the base body of the switching mechanism housing is formed in one piece.
11 . The temperature-dependent switch according to claim 9 , wherein the base body of the switching mechanism housing comprises an electrically conductive material.
12 . The temperature-dependent switch according to claim 6 , wherein the switching mechanism housing is arranged in the lower part and the heating resistor component rests on the switching mechanism housing.
13 . The temperature-dependent switch according to claim 1 , wherein the second section of the lid part is formed as a plastic ring surrounding the first section of the lid part.
14 . The temperature-dependent switch according to claim 1 , wherein the stationary contact part comprises a rivet that penetrates the lid part and captively connects the first section of the lid part with the second section of the lid part.