| 摘要 |
An electrically powered, intermittently operated heater device (10) for heating a liquid to a predetermined temperature which comprises: a) a heat sink (22); b) an electrical resistance heating element (16) embedded within the heat sink such that when electrical power is delivered to the heating element, heat is transferred therefrom to the heat sink and when the delivery of electrical power to the heating element is temporarily interrupted, residual heat in the heating element is transferred therefrom to the heat sink, the total quantity of heat transferred to the heat sink from the heating element not exceeding the heat capacity of the heat sink so that the temperature of the heat sink remains relatively constant both when electrical power is being delivered to the heating element and when the delivery of electrical power to the heating element is temporarily interrupted; and, c) a conduit (14) for the flow of a liquid to be heated to a predetermined temperature substantially corresponding to the temperature of the heat sink, the conduit having an inlet (12) for admitting liquid at a temperature below the predetermined temperature and an outlet (13) for discharging liquid at the predetermined temperature, the conduit being embedded within the heat sink such that electrical contact between the heating element and the liquid is prevented and such that heat is transferred from the heat sink to liquid present in the conduit raising the temperature of the liquid from the temperature at the conduit inlet to the predetermined temperature at the conduit outlet and being separated in the heat sink from the heating element by a distance which is sufficient to prevent or minimize the possibility of hot spots developing in the liquid. h |
