CN113365378A

CN113365378A - Planar device for inductively heating workpieces made of electrically conductive material

Info

Publication number: CN113365378A
Application number: CN202110673898.9A
Authority: CN
Inventors: 董卫列
Original assignee: Shanghai Dewei Krypton Automation Engineering Co ltd
Current assignee: Shanghai Dewei Krypton Automation Engineering Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2021-09-07

Abstract

The invention discloses a plane device for inductively heating a workpiece made of conductive material, comprising a plane inductor body, wherein the plane inductor body is provided with a shell, the top of the shell is provided with a metal object, an induction coil is arranged in the shell, the induction coil generates an alternating magnetic field B corresponding to a field line in an inlet area of the workpiece, the inlet of the workpiece is arranged above the top of an air space, the plane device inductively heats the workpiece made of the conductive material moving on a production line, the turns of the induction coil are provided with at least one group of turns with selected cross section shapes, the turns are arranged in parallel facing to an effective induction surface of the workpiece to be heated in a clamping state, the current flow directions are consistent, the turns are mutually connected together in a spiral or screw winding mode through other turns, and form an open air space or a coil iron core surrounding a magnetic conductive flux device, the geometry of the workpiece can be adapted.

Description

Planar device for inductively heating workpieces made of electrically conductive material

Technical Field

The invention relates to the field of induction heating, in particular to a plane device for inductively heating a workpiece made of conductive materials.

Background

An induction heater (inductor for short) is an inductance coil, can meet various heating processes by reasonably distributing induction magnetic fields, is a key component for realizing various induction heating processes, is also a necessary component, and has the performance directly related to the excellence of the heating processes. The basic working principle is that an alternating current is used to generate an alternating magnetic field, and the alternating magnetic field generates eddy currents in a metal conductor, so that a metal workpiece can rapidly generate heat. In the process of induction heating, the temperature is only the metal part of the heated workpiece, the induction heater can also have heat, cooling water is needed to be introduced for cooling in the use work of most inductors, and the non-metal part of the heated workpiece does not generate heat. The existing induction heater has single function and poor flexibility, can not heat workpieces made of conductive materials and moving on a production line, and can not heat workpieces in different shapes. The magnetic field is concentrated in the conductive areas and can connect the voids or connect the spaces in the dispersed areas. In the induction device described above, the workpiece is located mainly in the region of the inductively heated coil poles, in which case, although the maximum magnetic flux inside the coil can be used for heating, it is often not possible to achieve optimum heating if workpieces with complex geometries are encountered.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems of the prior art by providing a planar device for inductively heating a workpiece made of electrically conductive material.

In order to achieve the purpose, the invention provides the following technical scheme: planar device for inductively heating a workpiece made of electrically conductive material, comprising a planar inductor body, on which a housing is provided, on the top of which a metal object is provided, inside which an induction coil is arranged, which induction coil generates an alternating magnetic field B corresponding to field lines in a region of an inlet of the workpiece arranged above the top of an air space, the turns of the induction coil being wound on a plate-type coil former, adjacent turns being arranged side by side transversely in the plate-type coil former, the cross-sectional turn group being clamped towards the upper air space to form an effective induction surface, the cross-sectional turn group being interconnected by means of a further turn section a and a turn section B in the form of a helical winding, the coil poles surrounding the ends being formed by a coil core made of track material, the plate-type coil former being mounted on the shell wall of the housing, the two cover plates of the shell are respectively a cover plate A and a cover plate B, a cooling channel is arranged between the cover plate A and the cover plate B, a blower is installed at the bottom of the cooling channel, and a magnetic conduction insulation flux meter is added to the induction coil in the direction that the coil pole of the induction coil faces the shell wall.

In a preferred embodiment of the present invention, the geometry of the induction coil is a longitudinally stretched planar rectangular coil.

In a preferred embodiment of the present invention, the cover plates a and B are made of a high temperature resistant insulating material.

As a preferred embodiment of the present invention, the cooling channel is connected to the outside through an air gap.

In a preferred embodiment of the present invention, the flux sensor is made of ferrite material or ferromagnetic composite material, and the flux sensor is arranged on a wider side inside the induction coil.

In a preferred embodiment of the invention, the metal object on the top of the planar inductor body overlaps the seal of the joint seam, the metal object flows through the workpiece inlet area above the active induction surface, and the coating of the metal object is inductively heated.

The invention has the beneficial effects that: the invention relates to an induction heating device for inductively heating a workpiece moving on a production line, made of electrically conductive material, by means of at least one induction coil with alternating current, consisting of a plurality of windings of winding wire, the windings of which have at least one winding with a selected cross-sectional shape, which are arranged in parallel in the clamped state facing the active induction surface of the workpiece to be heated, have a uniform current flow direction, are connected to one another by means of further winding cross-sections in the form of a spiral or helical winding, and form an open air space or a coil core surrounding a magnetic flux guide, which can be adapted to the geometry of the workpiece.

Drawings

FIG. 1 is a schematic view of a planar inductor apparatus for inductively heating a metal object;

FIG. 2 is a vertical cross-section of the planar inductor of FIG. 1;

FIG. 3 is a top view of the planar inductor coil shown in FIGS. 1 and 2;

fig. 4 is a vertical longitudinal view of the planar inductor shown in fig. 1, 2 and 3.

In the figure: planar inductor body 110, housing 112, cover plate a113, cover plate B114, cooling channel 115, rectangular coil form 116, air gap 117, induction coil 120, field lines 122, bond seam 123, metal object 124, air space 125, blower 126, width 129, length 130, turns 132, turn group 134, induction surface 136, turn section a138, turn section B140, coil pole 144, flux 152.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention.

Example (b): referring to fig. 1-4, the present invention provides a technical solution: a planar device for inductively heating a workpiece made of electrically conductive material, comprising a planar inductor body 110, a housing 112 arranged on the planar inductor body 110, a metal object 124 arranged on the top of the housing 112, an induction coil 120 arranged inside the housing 112, the induction coil 120 generating an alternating magnetic field B corresponding to field lines 122 at the entrance area of the workpiece, the entrance of the workpiece arranged above the top of an air space 125, turns 132 of the induction coil 120 wound around a plate coil former 116, adjacent turns 132 arranged laterally side by side in the plate coil former 116, a cross-sectional turn group 134 clamped against the upper air space 125 to form an effective induction surface 136, the cross-sectional turn group 134 interconnected by means of a further turn section A138 and a turn section B140 in a helical fashion, the coil poles 114 surrounding the ends made of a coil core made of a magnetic track material, the plate-type coil frame 116 is mounted on the wall of the housing 112, the cover plate of the housing 112 has two cover plates a113 and B114, respectively, a cooling channel 115 is provided between the cover plate a113 and the cover plate B114, a blower 126 is mounted at the bottom of the cooling channel 115, and the induction coil 120 is provided with a magnetically conductive and insulating flux guide 152 at its coil pole 144 facing the wall of the housing.

The geometry of the induction coil 120 is a longitudinally stretched flat rectangular coil.

The material of the covering plate A113 and the covering plate B114 is a high-temperature resistant insulating material.

The cooling channel 115 is connected to the outside via an air gap 117.

The flux sensor 152 is made of a ferrite material or a ferromagnetic composite, and the flux sensor 154 is arranged on the wider side inside the induction coil 120.

The metal object 124 at the top of the planar inductor body 110 overlaps the seal of the joint seam 123, the metal object 124 flows through the workpiece entrance area above the active induction surface 136, and the coating of the metal object 124 is inductively heated.

The working principle is as follows: planar device for inductively heating a workpiece made of electrically conductive material, comprising a planar inductor body 110, a housing 112, a cover plate a113, a cover plate B114, a cooling channel 115, a rectangular coil former 116, an air gap 117, an induction coil 120, field lines 122, a joint seam 123, a metal object 124, an air space 125, a blower 126, a width 129, a length 130, turns 132, a turn group 134, a sensing surface 136, a turn section a138, a turn section B140, coil poles 144, a flux former 152, the inductor comprising a housing 112 of substantially the shape of a longitudinally elongated cuboid, in which the induction coil 120 is arranged, the geometry of the induction coil 120 being a longitudinally elongated planar rectangular coil which generates an alternating magnetic field B corresponding to the field lines 122 in the workpiece, the entrance of the workpiece being arranged above the top of the air space 125, the entrance area 132 of the induction coil 120 being wound over the length 130 and the width 129 of the plate-type coil former 116, adjacent turns 132 are juxtaposed transversely in the plate form coil former 116 with an upwardly directed group 134 of turns of selected cross-sectional shape clamped facing the upper air space 125 to form an effective inductive surface 136; the turns 134 of the selected cross-sectional shape are interconnected in a helical fashion by additional turn sections 138, the coil core of track material surrounding the end coil pole 114, and the plate formers 116 are mounted to the walls of the housing 112. The cover plate of the housing 112 has two cover plates, i.e., a cover plate a113 and a cover plate B114, which are made of a high temperature resistant insulating material. Between the two

cover plates

113, 114 there is a cooling channel 115, to which cooling air is fed by means of a blower 126, which cooling channel is open to the outer space through an air gap 117; to avoid heating the housing, the induction coil has magnetically permeable insulated flux meters 152 with its coil poles 144 facing the housing wall; the flux sensors 152, like pole pieces, are made of ferrite material or ferromagnetic composite, and other flux sensors 154 can be arranged on the wider side of the inside of the induction coil 120, and the planar inductor is particularly suitable for overlapping the metal object 124 and sealing the joint seam 123, especially the outer sealing strip of a cylindrical can. As the sheet metal object flows through the workpiece entrance area above the active sensing surface 136, its seam coated with a molten coating is inductively heated.

The invention relates to an induction heating device for inductively heating a workpiece moving on a production line, which is made of an electrically conductive material, by means of at least one induction coil 120 with alternating current, which is formed from a plurality of winding wire turns. In order to be able to adapt optimally to the geometry of the workpiece, the turns 132 of the induction coil 120 according to the invention have at least one group of turns 134 of a selected cross-sectional shape, which are arranged in parallel in the clamped state on the active induction surface 136 facing the workpiece to be heated, have a uniform current flow direction and are connected to one another by further

turn cross sections

138, 140 in the form of a spiral or helical winding and form an open air space 125 or a coil core surrounding the magnetic conductivity measuring device.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. Planar device for inductively heating a workpiece made of electrically conductible material, comprising a planar inductor body (110), characterized in that: the planar inductor body (110) is provided with a shell (112), a metal object (124) is arranged on the top of the shell (112), an induction coil (120) is arranged in the shell (112), the induction coil (120) generates an alternating magnetic field B corresponding to field lines (122) in a workpiece inlet area, the workpiece inlet is arranged above the top of an air space (125), turns (132) of the induction coil (120) are wound on a plate-type coil frame (116), adjacent turns (132) are transversely juxtaposed in the plate-type coil frame (116), a cross-section-shaped turn group (134) is clamped towards an upper air space (125) to form an effective induction surface (136), the cross-section-shaped turn group (134) is mutually connected in a screw winding mode through other turn section A (138) and turn section B (140), a coil core made of a magnetic track material surrounds a coil pole (114) of the end head, plate-type coil frame (116)) is installed on the shell wall of a shell (112), the two cover plates of the shell (112) are respectively a cover plate A (113) and a cover plate B (114), a cooling channel (115) is arranged between the cover plate A (113) and the cover plate B (114), a blower (126) is installed at the bottom of the cooling channel (115), and a magnetic conduction insulation flux meter (152) is added to the induction coil (120) in the direction of a coil pole (144) of the induction coil facing the shell wall.

2. A planar device for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the geometry of the induction coil (120) is a longitudinally stretched planar rectangular coil.

3. A planar device for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the material of the covering plate A (113) and the covering plate B (114) is a high-temperature-resistant insulating material.

4. A planar device for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the cooling channel (115) is connected to the outside via an air gap (117).

5. A planar device for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the flux meter (152) is made of ferrite material or ferromagnetic composite substance, and the flux meter (154) is arranged on the wider side inside the induction coil (120).

6. A planar device for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: a metal object (124) on top of the planar inductor body (110) overlaps the seal of the joint seam (123), the metal object (124) flows through the workpiece entrance area above the active induction surface (136), and the coating of the metal object (124) is inductively heated.