CN215773631U

CN215773631U - Concave device for inductively heating a workpiece made of electrically conductive material

Info

Publication number: CN215773631U
Application number: CN202121581279.9U
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: 2021-07-13
Filing date: 2021-07-13
Publication date: 2022-02-08
Anticipated expiration: 2031-07-13

Abstract

The utility model discloses a concave surface device for inductively heating a workpiece made of conductive material, comprising a gap inductor and the workpiece, wherein a longitudinal gap is upwards arranged on a shell of the gap inductor, the boundary of the longitudinal gap is respectively composed of two lateral tooth surfaces and a bottom, at least one induction coil matched with the shell in shape is arranged in the shell, the workpiece made of the conductive material moving on a production line is inductively heated, the wire turns of the induction coil at least have a group of wire turns with selected cross-sectional shapes, and the wire turns are arranged in parallel facing to the effective induction surface of the workpiece to be heated in a clamping state, the current flow direction of the current is consistent, and the current flows are connected with each other in a spiral or screw winding mode through other wire turn sections, and forms an open air space or a coil core surrounding the flux guide, which can be adapted to the geometry of the workpiece.

Description

Concave device for inductively heating a workpiece made of electrically conductive material

Technical Field

The utility model relates to the field of induction heating, in particular to a concave device for induction heating of 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 object of the present invention is to solve the above-mentioned problems of the prior art by providing a concave device for inductively heating a workpiece made of electrically conductive material.

In order to achieve the purpose, the utility model provides the following technical scheme: the concave surface device for inductively heating a workpiece made of conductive materials comprises a gap inductor and the workpiece, wherein a longitudinal gap is formed in the shell of the gap inductor upwards, the boundary of the longitudinal gap is respectively composed of two lateral tooth surfaces and a bottom, at least one induction coil matched with the shell in shape is arranged in the shell, the induction coil generates magnetic field lines, an air blower is installed on the side surface of the gap inductor, and a plurality of shell openings are formed in the shell.

As a preferred embodiment of the present invention, the induction coils each have a plurality of turns made of winding wire, the turns of the induction coil are in two sets of turn sections in the lateral tooth surface region of the housing, and after being boosted, are arranged side by side in the same current direction of the induction surface facing the longitudinal slot, and are connected to each other by the turns in the cross section in a spirally wound manner so as to surround the open rectangular opening.

In a preferred embodiment of the utility model, a clamping surface consisting of a set of turns is present below the induction surface, the magnetic field lines for heating the workpiece being arranged in the air space adjacent thereto, the induction surfaces of the turns of the selected cross-sectional shape being arranged laterally at a distance from one another and facing one another, together forming a first air space in the form of a slot which surrounds and is parallel to the longitudinal slot in the housing.

In a preferred embodiment of the utility model, the winding group is bounded on its outer side facing away from the induction surface by a magnetically conductive flux guide which is made of ferromagnetic material and has electrically insulating properties.

In a preferred embodiment of the utility model, the flux guide is located on the outer side thereof facing away from the air space, and is partially bounded by a magnetically conductive flux guide, which is made of a ferrite material or a ferromagnetic composite material.

In a preferred embodiment of the present invention, the slot inductor has two induction coils inside a housing, and windings of the two induction coils are connected in series through a cable.

The utility model has the beneficial effects that: the utility model 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 representation of a slot inductor-induction heating apparatus;

FIG. 2 is a vertical cross-section of the slot coil of FIG. 1;

fig. 3 is a side view of a first coil configuration of the slot inductor shown in fig. 1 and 2;

fig. 4 is a side view of a second coil configuration of the slot inductor shown in fig. 1 and 2;

FIG. 5a is a vertical cross-section of FIG. 2;

fig. 5b shows a side view of a third coil configuration of the slot inductor shown in fig. 1 and 5 a.

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 utility model more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the utility model.

Example (b): referring to fig. 1, the present invention provides a technical solution: a concave device for inductively heating a workpiece made of conductive material comprises a gap inductor 10 and a workpiece 24, wherein a longitudinal gap 14 is formed upwards in a shell 12 of the gap inductor 10, the boundary of the longitudinal gap 14 is respectively formed by two lateral tooth surfaces 16 and a bottom 18, at least one induction coil 20 matched with the shell 12 in shape is arranged in the shell 12, the induction coil 20 generates magnetic field lines 22, a blower 26 is arranged on the side surface of the gap inductor 10, and a plurality of shell openings 30 are formed in the shell 12.

The induction coils 20 each have a plurality of turns 32 of winding wire, the turns 32 of the induction coil 20 having two sets of turn sections 34 in the region of the lateral flanks 16 of the housing 12, and the current flow direction is identical when the turns are arranged side by side on the induction surface 36 facing the longitudinal slot 14 after the voltage has been raised, and they are connected to one another by turns of cross-section in a helically wound manner, surrounding an open rectangular opening 42. Below the induction surface 36 there is a clamping surface formed by a set of turns of wire, the magnetic field lines 22 for heating the workpiece 24 being arranged in the air space adjacent thereto, the induction surfaces of the turns of wire of the selected cross-sectional shape being spaced laterally apart and arranged opposite each other, together forming a first air space in the shape of a slit, which surrounds and is parallel to the longitudinal slit 14 in the housing 12. The group of turns 32 is bounded on its outer side facing away from the sensing surface 36 by a magnetically conductive flux element 52, the flux element 52 being of ferromagnetic material and having electrically insulating properties. On its outer side facing away from the air space, the flux guide 52 is partially bounded by a magnetically conductive flux guide, the flux guide 52 being made of a ferrite material or a ferromagnetic composite material. The slot inductor 10 has two induction coils 20 inside the housing 12, the windings of which are opened in series by a cable.

The working principle is as follows: concave device for inductively heating a workpiece made of electrically conductive material, in fig. 1 a gap inductor (10) is shown, whose housing (12) has a longitudinal opening (14) facing upwards,

the boundary of the magnetic field is composed of two lateral tooth surfaces (16) and a bottom (18), and at least one alternating current induction coil (20, 20') matched with the shape of the shell (12) is arranged in the shell (12) to generate a high-frequency alternating magnetic field B, and a part of magnetic field lines (22) of the magnetic field is shown in figure 1. The alternating magnetic field B causes an induction flow in the workpiece (24) located in the gap space (14), which induction flow heats the workpiece to a predetermined temperature, the excitation current having a frequency of 10-100 kHz is generated by a motor, not shown, and fig. 1 also shows a blower (26) from which cold air is blown into the housing, the cold air entering along a channel (28) and cooling the induction coils (20, 20'), and the heated air being discharged through the housing openings (30).

Fig. 2-5 b indicate the induction coils (20, 20') of the slot inductor (10). Each induction coil (20, 20') has a plurality of turns (32) of winding wire, preferably high frequency litz wire due to its high excitation frequency. The turns (32) of the induction coil (20, 20 ') are in the form of two groups of turns (34, 34') of selected cross-section in the region of the lateral flanks (16) of the housing (12), are arranged, after boosting, side by side on the active induction faces (36, 36 ') facing the longitudinal opening (14) with the same direction of current flow, and are connected to one another by turns (38, 38', 40) of other cross-sectional shapes in a helically wound manner, surrounding an open air space (42). A clamping surface consisting of a set of turns is present below the active induction surface (36, 36'), and the magnetic field lines (22) for heating the workpiece (24) are arranged in the air space adjacent thereto. The active sensing surfaces (36, 36 ') of the selected cross-sectional shape of the turns (34, 34 ') are laterally spaced and arranged toward one another to together form a slot-shaped air space (14 ') which surrounds and is parallel to the longitudinal slot in the housing (12).

In fig. 2 and 3, it can be seen that the turns (34, 34') of the selected cross-sectional shape and the same

The shaped section (38, 38', 40) of the turns forms a flat rectangular spiral (42) with a rectangular opening in the middle at the reserved, open bottom, and the ends of the adjacent sections of the turns, which are folded back at 90 DEG on the rectangular side of the turns, together form a chamfer (44). In the erected state, the two active induction surface coil groups (36, 36 ') formed by the selected cross-sectional shape of the turns (34, 34 ') and part of the other turn cross-sections (38, 38 ') are folded by 90 DEG from the reserved blanking opening layer surface to one side into bending lines (48) parallel to the turn cross-sections (34, 34 ') and perpendicular to the turn cross-sections (38, 38 '). The bend line (48) is spaced from the aperture edge (46) and extends through the central aperture of the open air space (42). The other wire-loop cross-section (40) is delimited at both ends of the induction coil (20, 20') and delimits a bottom region of the longitudinal slot (14) parallel to the bottom (18) in the reserved underfeed layer (50).

The magnetic field lines (22) of the alternating magnetic field B, which are partially shown in fig. 1, are generated by the active inductive surfaces (36, 36'). One feature of the configuration shown in fig. 2-5 b is that the other coil sections (38, 38', 40) can be clamped on their side facing the inside of the gap against the workpiece (24) to be heated facing the induction surface. In this region, the magnetic field lines are on the turn cross-section (38, 38', 40) depending on the direction of the current.

In order to optimize the efficiency and avoid unacceptable heating in the peripheral region, the turns of the selected cross-sectional shape

The group (34, 34 ') is bounded on its outer side facing away from the effective sensing surface (36, 36') by a magnetically conductive flux guide (52) which is of ferromagnetic material and has electrically insulating properties. In a further development, the flux guide (38, 38', 40) is bounded in part by a magnetic flux guide (54, 56) on its outer side facing away from the air space. The flux meter (52, 54, 56) is made of ferrite material or ferromagnetic composite material, and has the characteristics of magnetic conduction and electric insulation. Thus, the heating of the magnetic field can be ensured without generating eddy current under the action of the alternating magnetic field.

The difference between the example of construction of fig. 4 and fig. 3 is that the slot inductor has two induction coils (20, 20') inside the housing (12), the windings of which are opened in series by a cable (60). The advantage of this arrangement is that if the slot inductor is long, the operation of the winding can be simplified and the winding can be additionally optimized to fit the workpiece to be heated.

Fig. 5b shows a further embodiment of a slot inductor, which differs from the embodiment of fig. 3 in that the winding density differs in the different turn sections (34, 38). The windings (32) are closely spaced in the selected cross-sectional shape of the group of turns (34), while the windings (32) are spaced apart in the

cross-sectional shapes

38 and 40. Different winding cross sections can in principle have a multilayer winding. In this case, different flux densities can be present inside the slot inductor, which additionally increases the possibility of adapting the heating requirements.

The inductors shown in fig. 1-5 b are particularly suitable for stripping coated metal workpieces from a process line.

The utility model 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 (20) which carries an alternating current and 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 (32) of the induction coil (20) according to the utility model have at least one set of turns (34, 34 ') of a selected cross-sectional shape, which are arranged in parallel in the clamped state on the active induction surface (36, 36 ') facing the workpiece to be heated, have a uniform current flow direction and are connected to one another by further turn cross-sections (38, 38 ', 40) in the form of a spiral or helical winding and form an open air space (42) or a coil core (42) 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 to be construed as limiting the scope of the utility model. 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. Concave device for inductively heating a workpiece made of electrically conductive material, comprising a gap inductor (10) and a workpiece (24), characterized in that: the slot inductor comprises a slot inductor (10), wherein a longitudinal slot (14) is formed in the upward direction of an outer shell (12) of the slot inductor (10), the boundary of the longitudinal slot (14) is formed by two lateral tooth surfaces (16) and a bottom (18) respectively, at least one induction coil (20) matched with the outer shell (12) in shape is arranged in the outer shell (12), magnetic field lines (22) are generated by the induction coil (20), an air blower (26) is installed on the side surface of the slot inductor (10), and a plurality of outer shell openings (30) are formed in the outer shell (12).

2. Concave apparatus for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the induction coils (20) each have a plurality of windings (32) made of winding wire, the windings (32) of the induction coils (20) having two sets of winding cross sections (34) in the region of the lateral flanks (16) of the housing (12), and after the voltage has been increased, the current directions of the windings arranged side by side on the induction surfaces (36) facing the longitudinal slot (14) are identical, and they are connected to one another by means of the windings of the cross section in a helically wound manner, surrounding an open rectangular opening (42).

3. Concave apparatus for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: a clamping surface consisting of a set of turns is present below the induction surface (36), magnetic field lines (22) for heating the workpiece (24) being arranged in the air space adjacent thereto, the induction surfaces of the turns of the selected cross-sectional shape being arranged laterally at a distance from one another and facing one another, together forming a slot-shaped first air space which surrounds and is parallel to the longitudinal slot (14) in the housing (12).

4. Concave apparatus for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the group of turns (32) is limited on its outer side facing away from the sensing surface (36) by a magnetically conductive gauge (52), the gauge (52) being of ferromagnetic material and having electrically insulating properties.

5. Concave apparatus for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the flux device (52) is arranged on the outer side of the flux device, which is opposite to the air space, and a part of the flux device is limited by the magnetic conductive flux device, and the flux device (52) adopts ferrite material or ferromagnetic composite material.

6. Concave apparatus for inductively heating a workpiece made of electrically conductive material as recited in claim 1, wherein: the gap inductor (10) is provided with two induction coils (20) inside a shell (12), and windings of the two induction coils are connected in series through a cable.