Electric heating device

Abstract

Electric heating device (10), with: a body (20); and a heating head (30) connected to the body (20) and comprising an electric heating wire (31) and a heat storage element (32), wherein the electric heating wire (31) has a first section (311) and a second section (312) with a proximal end connected to the first section (311), wherein the first section (311) is made of pure nickel and the second section (312) is made of ferrochrome, and wherein the heat storage element (32) is mounted around a radial outer circumference of the second section (312), and wherein the heat storage element (32) is made of china clay.

Description

Background of the invention

[0001] The present invention relates to heating appliances and in particular to electric heating devices.

[0002] A typical soldering iron consists of a heated metal tip and an insulated handle. Heating is often achieved electrically by passing an electric current through a resistance heating element via a metal wire, such as a copper wire. Because the melting point of copper wire is low, the metal wire can easily break or be damaged by the thermal effects of the high temperature of the heated metal tip.

[0003] DE 10 2015 109 491 A1 describes a portable multi-functional heating device comprising a body which has a power connection element and a battery, wherein a power connector is mounted on the power connection element and has a first and a second electrode.

[0004] DE 198 10 519 A1 describes a heating element and sensor combination consisting of a heated first metal element, an unheated element which optionally includes the first metal, and an unheated second metal element, wherein the heated first metal element is connected to the front end of the unheated second metal element.

[0005] DE 12 48 829 A describes a method for manufacturing electrically insulated soldering tip carrier tubes with heating coils for internally heated miniature soldering irons for use with a low-voltage supply, comprising forms of a tube made of woven fiberglass fabric which is longer than several carrier tubes joined together and has an outer diameter which is slightly larger than the inner diameter of the carrier tubes.

[0006] Therefore, there is a need for a novel electric heating device to reduce and / or eliminate the above disadvantages. Brief description of the invention

[0007] An electric heating device according to the invention comprises a body and a heating head connected to the body. The heating head includes an electric heating wire and a heat storage element. The electric heating wire has a first section and a second section with a proximal end connected to the first section. The first section is made of pure nickel and the second of ferrochrome. The heat storage element is mounted around a radial outer circumference of the second section and is made of kaolin. Brief description of the drawings Fig. Figure 1 shows a perspective view of an electric heating device according to the invention; Fig. Figure 2 shows a perspective exploded view of the electric heating device of Fig. 1; Fig. Figure 3 shows a cross-sectional view of the electric heating device of Fig. 1; and Fig. Figure 4 shows a partial cross-sectional exploded view of a heating head of the electric heating device of Fig. 1. Detailed description of the invention

[0008] The Fig. Figures 1-4 show an electric heating device 10 according to the invention. The electric heating device 10 has a body 20 and a heating head 30 connected to the body 20. A head end 21 with a recess 22 is provided at one end of the body 20. A first electrode 23 is arranged on a bottom surface of the recess 22, and a second electrode 24 is arranged on an inner wall extending around the bottom surface of the recess 22.

[0009] The heating head 30 comprises an electric heating wire 31, a heat storage element 32, and an outer sleeve 33. The electric heating wire 31 has a first section 311 and a second section 312 with a proximal end connected to the first section 311. In this embodiment, the second section 312 can be permanently welded to the first section 311. The first section 311 is made of pure nickel, and the second section 312 is made of ferrochrome. The heat storage element 32 is mounted around a radial outer circumference of the second section 312 and is made of kaolin. The outer sleeve 33 is made of an electrically conductive material and is mounted around the heat storage element 32. A distal end of the second section 312, opposite the proximal end, is connected to the outer sleeve 33.At the distal end of the second section 312 is a flat section 313, which extends radially outward from the second section 312, and an end edge of the flat section 313 is connected to an end face of the outer sleeve 33. In the embodiment, the flat section 313 can have a circular cross-section and can be connected to the end face of the outer sleeve 33 by spot welding.

[0010] The heating head 30 further comprises a power supply connector 34, which is detachably connected to the body 20, and a connecting seat 35, which is mounted at one end of the power supply connector 34. The power supply connector 34 has a third electrode 341, which is electrically connected to the first electrode 23, and a fourth electrode 342, which is electrically connected to the second electrode 24. The fourth electrode 342 can be connected to the second electrode 24 by screwing. The first section 311 is electrically connected to the third electrode 341. An end of the outer sleeve 33 opposite the flat section 313 is connected to a connecting element 331 made of an electrically conductive material. One end of the connecting element 331 is electrically connected to the fourth electrode 342, and the connecting element 331 is formed in a spiral shape by winding.The connecting seat 35 has a through hole 351 extending through it, and the through hole 351 is mounted around a section of a radial outer circumference of the outer sleeve 33.

[0011] Therefore, the electric heating wire 31 is connected by sections made of three different materials: pure nickel, ferrochrome, and kaolin. When the heating head 30 is energized, the resistance of the first section 311 is low, so no excessive heat energy is generated. When the current flows through the second section 312, it can be converted into heat energy to increase the temperature. The second section 312 is covered by the heat storage element 32 made of kaolin, so the heating head 30 can be heated to a very high temperature without being damaged, resulting in extremely high heat generation efficiency. Furthermore, the first section 311 is made of pure nickel with good heat resistance, so it does not easily melt due to the high temperature generated by the second section 312.Therefore, the electric heating device 10 is not easily damaged by a high temperature.

Claims

[1] Electric heating device (10), comprising: a body (20); and a heating head (30) connected to the body (20) and comprising an electric heating wire (31) and a heat storage element (32), wherein the electric heating wire (31) has a first section (311) and a second section (312) with a proximal end connected to the first section (311), wherein the first section (311) is made of pure nickel and the second section (312) is made of ferrochrome, and wherein the heat storage element (32) is mounted around a radial outer circumference of the second section (312), and wherein the heat storage element (32) is made of china clay. [2] Electric heating device (10) according to claim 1, wherein the second section (312) is welded firmly to the first section (311). [3] Electric heating device (10) according to claim 2, wherein the heating head (30) has an outer sleeve (33) made of an electrically conductive material and mounted around the heat storage element (32), and wherein a distal end of the second section (312) opposite the proximal end is connected to the outer sleeve (33). [4] Electric heating device (10) according to claim 3, wherein a flat section (313) is provided at the distal end of the second section (312) extending radially outwards from the second section (312), and wherein an end edge of the flat section (313) is connected to an end surface of the outer sleeve (33). [5] Electric heating device (10) according to claim 4, wherein the flat section (313) is connected to the end surface of the outer sleeve (33) by spot welding. [6] Electric heating device (10) according to claim 4, wherein the flat section (313) has a circular cross-section. [7] Electric heating device (10) according to claim 4, wherein an end of the body (20) has a head end (21) with a recess (22), wherein a first electrode (23) is provided on a bottom surface of the recess (22), wherein a second electrode (24) is arranged on an inner wall extending around the bottom surface of the recess (22), wherein the heating head (30) has a power supply connector (34) which is detachably connected to the body (20), and wherein a third electrode (341) is provided on the power supply connector (34) which is electrically connected to the first electrode (23), and a fourth electrode (342) which is electrically connected to the second electrode (24). [8] Electric heating device (10) according to claim 7, wherein the heating head (30) has a connecting seat (35) mounted at one end of the power supply connector (34), wherein a through hole (351) extending through the connecting seat (35) is formed, and wherein the through hole (351) is mounted around a section of a radial outer circumference of the outer sleeve (33). [9] Electric heating device (10) according to claim 7, wherein the fourth electrode (342) is connected to the second electrode (24) by screwing it together. [10] Electric heating device (10) according to claim 7, wherein the first section (311) is electrically connected to the third electrode (341), wherein an end of the outer sleeve (33) opposite the flat section (313) is connected to a connecting element (331) made of an electrically conductive material, wherein an end of the connecting element (331) is electrically connected to the fourth electrode (342), and wherein the connecting element (331) is formed by winding in a spiral shape.

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