Heating coil and heating method

Patent metadata

Field	Value
Publication number	US-2021321495-A1
Application number	US-201917270685-A
Country	US
Kind code	A1
Filing date	Aug 21, 2019
Priority date	Aug 23, 2018
Publication date	Oct 14, 2021
Grant date	—

Abstract

A heating coil includes a plurality of loop portions disposed coaxially along an axis, a first lead portion and a second lead portion which electrically connect to a power source, and a connection portion which connects the plurality of loop portions, the first lead portion, and the second lead portion in series.

First claim

1 . A heating coil comprising:
a plurality of loop portions disposed coaxially along an axis; a first lead portion and a second lead portion which electrically connect to a power source; and a connection portion which connects the plurality of loop portions, the first lead portion, and the second lead portion in series, wherein the plurality of loop portions includes a first end portion and a second end portion facing each other with a gap therebetween in a circumferential direction, and rotates from the first end portion toward the second end portion in the circumferential direction about the axis, wherein the gaps of the plurality of loop portions are offset from each other in the circumferential direction about the axis, wherein the connection portion includes a plurality of arc-shaped connection portions extending along an outer peripheral surface of each of the plurality of loop portions, wherein the plurality of arc-shaped connection portions includes one or more inter-loop arc-shaped connection portions, a first lead side arc-shaped connection portion, and/or a second lead side arc-shaped connection portion, wherein the one or more inter-loop arc-shaped connection portions electrically connect a second end portion of a first loop portion and a first end portion of a second loop portion in which the first loop portion and the second loop portion are adjacent, and rotate from the second end portion of the first loop portion toward the first end portion of the second loop portion in the circumferential direction about the axis, wherein a first lead side arc-shaped connection portion electrically connects a first end portion of a loop portion disposed on one end side of a series connection of the plurality of loop portions and the first lead portion, and rotates from the first lead portion toward the first end portion in the circumferential direction about the axis, wherein the second lead side arc-shaped connection portion electrically connects a second end portion of a loop portion disposed on the other end side of a series connection of the plurality of loop portions, and rotates from the second end portion toward the second lead portion in the circumferential direction about the axis.

2 . The heating coil according to claim 1 ,
wherein a sum of arc center angles of the plurality of arc-shaped connection portions is 360° or more.

3 . The heating coil according to claim 1 ,
wherein the gaps of each of the plurality of loop portions are disposed at equal angular intervals about the axis.

4 . The heating coil according to claim 1 ,
wherein the gap of at least one loop portion of the plurality of loop portions and the arc-shaped connection portion disposed along the outer peripheral surface of the loop portion overlap in the radial direction.

5 . The heating coil according to claim 1 ,
wherein the width of an inner peripheral surface of each of the plurality of loop portions is smaller than the width of the outer peripheral surface.

6 . A heating method, comprising:
inserting a workpiece into the plurality of loop portions of the heating coil according to claim 1 ; and inductively heating the workpiece by relatively moving the heating coil and the workpiece only in the axial direction in a state in which AC power is supplied to the heating coil.

Assignees

• Neturen Co Ltd

Inventors

• Yasutake Hidehiro
• Horino Takashi
• Inoue Hiroki
• Kinoshita Hiroaki

Classifications

• H05B6/44

  having more than one coil or coil segment · CPC title

• H05B6/104 Primary

  metal pieces being elongated like wires or bands · CPC title

• H05B6/102 Primary

  the metal pieces being rotated while induction heated · CPC title

• H05B6/40

  Establishing desired heat distribution, e.g. to heat particular parts of workpieces · CPC title

• Y02P10/25

  Process efficiency · CPC title