A heating element unit for an electric resistance heater comprises: a casing; a heating element within the casing; an electrical supply pin in electrical contact with the heating element; an electrically insulating filler between the heating element and the casing; and an electrically insulating barrier provided between portions of the heating element, the electrical supply pin and/or the casing. The electrically insulating barrier has a greater dielectric strength than the electrically insulating filler, and the dielectric strength of the electrically insulating barrier is greater than about 1500 kV/m (greater than about 40 V/mil).

A heating element unit for an electric resistance heater comprises: a casing; a heating element within the casing; an electrical supply pin in electrical contact with the heating element; an electrically insulating filler between the heating element and the casing; and an electrically insulating barrier provided between portions of the heating element, the electrical supply pin and/or the casing. The electrically insulating barrier has a greater dielectric strength than the electrically insulating filler, and the dielectric strength of the electrically insulating barrier is greater than about 1500 kV/m (greater than about 40 V/mil).

Provided is a rotor blade of a wind turbine including a leading edge section with a leading edge and a trailing edge section with a trailing edge, wherein the leading edge and the trailing edge divide the surface of the rotor blade into a suction side and a pressure side. The rotor blade further includes a blade shell for defining the outer shape of the rotor blade and a heating mat for anti-icing and/or deicing purposes which is arranged upon the blade shell. In the outboard region of the rotor blade, the heating mat is substantially or completely covered by a protective shield made of an electrically insulating polymer material. Use of a protective shield made of electrically insulating polymer material for electrical insulation of a heating mat in particular, against lightning strikes is also provided.

Provided is a rotor blade of a wind turbine including a leading edge section with a leading edge and a trailing edge section with a trailing edge, wherein the leading edge and the trailing edge divide the surface of the rotor blade into a suction side and a pressure side. The rotor blade further includes a blade shell for defining the outer shape of the rotor blade and a heating mat for anti-icing and/or deicing purposes which is arranged upon the blade shell. In the outboard region of the rotor blade, the heating mat is substantially or completely covered by a protective shield made of an electrically insulating polymer material. Use of a protective shield made of electrically insulating polymer material for electrical insulation of a heating mat in particular, against lightning strikes is also provided.

A heater system includes a plurality of heater cores defining zones, a plurality of power pins extending through each of the heater cores and made of different conductive materials, and at least one jumper connected between two of the plurality of power pins being made of dissimilar materials. The jumper is in communication with a controller to obtain a temperature reading of the heater system proximate the jumper.

A heater system includes a plurality of heater cores defining zones, a plurality of power pins extending through each of the heater cores and made of different conductive materials, and at least one jumper connected between two of the plurality of power pins being made of dissimilar materials. The jumper is in communication with a controller to obtain a temperature reading of the heater system proximate the jumper.

A circumferentially heating type curing needle is adapted for an E-cigarette and comprises a curing needle head that is built-in with a heating element. The curing needle head is externally plated with a non-stick coating which is a polytetrafluoroethylene (PTFE) coating or a PTFE non-stick nano coating. The curing needle head is further provided with a fixed support and a ceramic base, the ceramic base is secured into the fixed support, and the curing needle head is fixedly inserted into the ceramic base. The E-cigarette is provided with the aforesaid circumferentially heating type curing needle.

A circumferentially heating type curing needle is adapted for an E-cigarette and comprises a curing needle head that is built-in with a heating element. The curing needle head is externally plated with a non-stick coating which is a polytetrafluoroethylene (PTFE) coating or a PTFE non-stick nano coating. The curing needle head is further provided with a fixed support and a ceramic base, the ceramic base is secured into the fixed support, and the curing needle head is fixedly inserted into the ceramic base. The E-cigarette is provided with the aforesaid circumferentially heating type curing needle.

The present invention relates generally to a method of manufacturing far-infrared radiation thermal wire and far-infrared radiation thermal wire thereby, more particularly, a method of manufacturing far-infrared radiation thermal wire and far-infrared radiation thermal wire manufactured thereby, in which electric power is supplied with a predetermined resistance value. According to an embodiment of the present invention, a method of manufacturing far-infrared radiation thermal wire comprise steps of: making microfine wire that emits far-infrared radiation as it generates heat according to the resistance value when electricity is flowed in; making one strand of thermal wire by bundling many strands of the microfine wire that are in contact of each other; and making two or more groups each of the groups having different resistance value and comprising one or more microfine wires that have identical resistance value in order to make the bundle into an effective geometric structure that well radiates electric dipole radiation while emitting far-infrared radiation.

Disclosed are a ceramic electric heating element having a two-layer structure, and an electric soldering iron. The electric heating element having a two-layer ceramic structure comprises an inner conducting layer and an outer insulating layer; the insulating layer wraps the conducting layer, and the conducting layer is exposed outside the insulating layer at the head and tail of the electric heating element. In addition, the ceramic electric heating element having a two-layer structure is used to the electric soldering iron. The present invention allows the miniaturization in the manufacture of ceramic electric heating bodies, with low production cost and low difficulty in respect of the process.