JPH1050465A - Induction heater-and cooling pat-united work coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heating efficiency. SOLUTION: Cooling water is led into pipe coils 7, 7a... made of a conductive metal, and at the same time wire coils and the pipe coils 7, 7a... are electrically connected to give a work coil, so that a current can be carried to the pipe coils 7, 7a..., which are cooling parts and alternating magnetic fluxes are generated from the pipe coils 7, 7a.... The wire coils and the pie coils 7, 7a... are alternately arranged from the inner circumferential side to the outer circumferential side to compose one work coil, both of the inner and the outer circumferences of respective wire coils are made to be cooling parts and heat radiated in the entire body of the wire coils is absorbed in the cooling water which is led into the neighboring pipe coils 7, 7a... and then discharged outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work coil in which an induction heating furnace for heat-treating metal parts before processing and a cooling unit are integrated.

[0002]

2. Description of the Related Art Conventionally, an induction heating furnace is, as shown in FIG.
A plurality of work coils w, wa ... and cooling units c, ca ... are arranged alternately and in a row, and the work coils w, wa ... are energized to generate an alternating magnetic flux, and the work coils w, wa ... And by passing the components through the cooling sections c, ca,..., The alternating magnetic flux penetrates the components and induces a very high density eddy current on the component surface, which heats the component in a short time. I am doing it.

As shown in FIGS. 9 and 10, the cooling sections c, ca... Have a hole d in the center of a copper disk b and a cut from the outer periphery of the disk b to the hole d. A cooling pipe g is provided so as to extend along the outer peripheral shape of the heat absorbing plate f formed with the heat sink e, and the radiant heat from the work coils w, wa,. And cooling pipe g
It is absorbed into the cooling water inside and discharged outside, and the work coil w,
In order to prevent overheating of wa ..., the amount of current supplied to the work coils w, wa ... was kept constant.

However, in the induction heating furnace, since no alternating magnetic flux is generated from the cooling portions c, ca,... Between the work coils w, wa,. The magnetic flux can be increased to some extent by reducing the distance between wa ..., but the functions of the cooling units c, ca ... are reduced and the work coils w, wa ... are overheated.
As a measure for suppressing overheating of wa ..., the amount of current supplied to the work coils w, wa ... must be suppressed to a low level, and as a result, the magnetic flux does not increase.

Conversely, the overheating prevention effect of the work coils w, wa ... by the cooling units c, ca ... weakens as the distance from the cooling units c, ca ... decreases. In order to improve the overheating prevention function of the cooling units c, ca.
Must be narrowed or the widths of the cooling sections c, ca... Must be increased, which leads to an increase in the occupied space of the cooling sections c, ca, and a decrease in the total number of turns of the work coils w, wa. As a result, the magnetic flux is reduced, and the heating efficiency of the induction heating furnace is reduced.

Accordingly, in an induction heating furnace in which a plurality of work coils w, wa,... And cooling sections c, ca,. , Wa ... and the cooling units c, ca ... for cooling the work coils w, wa ... are mutually contradictory in terms of improving the operation and effect thereof, that is, configured to increase the generated magnetic flux. If the work coils w, wa ... overheat,
Conversely, if the work coils w, wa... Are configured to prevent overheating, there is a disadvantage that the generated magnetic flux is reduced.

[0007]

SUMMARY OF THE INVENTION The present invention integrates an induction heating furnace and a cooling unit for realizing one or both of increasing the generated magnetic flux and improving the overheating prevention function. A work coil is not provided.

[0008]

According to the present invention, there is provided an induction heating furnace based on the above-mentioned prior art, in which a plurality of work coils and cooling units are arranged alternately in a row. In view of the problem that it is not possible to simultaneously increase the amount of cooling and improve the cooling efficiency of the work coil, cooling water is passed through the pipe coil made of conductive metal, and the pipe coil and wire coil are electrically connected to form a work coil. Also, by supplying electricity to the pipe coil which is a cooling unit, an alternating magnetic flux is also generated at the pipe coil portion, that is, an alternating magnetic flux is generated from all the constituent members of the work coil.

Further, the wire coil and the pipe coil are alternately arranged from the inner circumference side to the outer circumference side so that the wire coil is arranged between the pipe coils to form one work coil. Is a cooling unit, in which the heat generated by the entire wire coil is absorbed by cooling water passing through the inside of the pipe coil and is discharged to the outside, thereby solving the above-mentioned problem.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an induction heating furnace for performing heat treatment before processing a metal part P;
, A plurality of work coils 3, 3a,... Arranged in the longitudinal direction of the casing 2 to form an induction heating furnace 1 by a heating section 4 and a transport section 5 for transporting components P in the heating section 4. ing.

Each of the work coils 3, 3a... Alternately includes wire coils 6, 6a... Made of a rectangular copper wire coated with insulation and pipe coils 7, 7a. Coil 6, 6a ... and pipe coil 7, 7a
Are connected so that a current flows in the same circumferential direction on a plane orthogonal to the transport direction of the transport section 5.

Specifically, the wire coils 6, 6a... And the pipe coils 7, 7a... From the inner circumferential side to the outer circumferential side of each work coil 3, 3a. ,
6a ... and the pipe coils 7,
7a project from both side surfaces of each work coil 3, 3a.

The winding directions of the wire coils 6, 6a ... and the pipe coils 7, 7a ... need not be all the same. For example, in the case of the wire coil 6 and the pipe coil 7 having different winding directions, the whole The current flow direction viewed from one end of the wire coil 6 and the pipe coil 7 in such a connected state is the same circling direction by connecting such that the current flow direction is reversed.

In the drawings, the wire coils 6, 6a are double-wound and the pipe coils 7, 7a are single-wound, but the number of turns is not limited at all. 7 may be connected so that a current flows in the same circumferential direction. In particular, as shown in FIGS. 4, 5, and 6, the wire coils 6, 6a. ,
When the pipe coils 7, 7a are wound in a single winding, the pipe coils 7, 7a are arranged on at least one of the inner and outer peripheral sides of the wire coils 6, 6a.
The overheat prevention function of ... is improved.

Also, the projecting portions of the respective work coils 3, 3a... And their respective pipe coils 7, 7a.

One end of each of the pipe coils 7, 7a is an inlet 10 for cooling water, and the other end is an outlet 10a. The inlet 10 of each pipe coil 7, 7a in each work coil 3, 3a. And the outlet 10a are united and connected to the water supply pipe 11 and the drain pipe 11a, and a power supply (not shown) is connected to the end of the work coil 3, 3a. The connection terminal 22 to the positive electrode is provided at the end on the outlet 10a side of the innermost pipe coil 7 of the work coil 3, 3a.

Also, one of the innermost pipe coils 7 on the starting end side of the adjacent work coils 3, 3a,.
Are connected to the connection terminal 22a at the end on the side of the outlet 10a at the end of the work coil 3, and the connection terminal 22 at the end on the side of the entrance 10 of the other outermost pipe coil 7c. The connection terminal 22 at the end on the inlet 10 side of the outer pipe coil 7c and the positive terminal of the power supply are connected to the connection terminal on the outlet 10a side end of the innermost pipe coil 7 of the last one.
The heating unit 4 may be formed by electrically connecting the work coils 3, 3a,.

Next, the transport unit 5 will be described.
Reference numeral 12a denotes an inner top plate and an inner bottom plate which are vertically arranged in the heating unit 4. The inner top plate 12 and the inner bottom plate 12a are respectively connected to both sides and the center between the inner top plate 12 and the inner bottom plate 12a. .. Are provided at predetermined intervals in the longitudinal direction to be integrated with each other, and the support members 13, 13a.
14 and 14a, and transport conveyors 1
5 and 15a, and the conveyor 1
The mounting plates 17, 17a,... Of the components P are fixedly mounted on the outer peripheral side of the endless chain 16, respectively.

The mounting plates 1 are provided on both sides of each of the transport paths 14 and 14a.
7, 17a... The receiving bases 18, 18a are provided on both sides, and the mounting plates 17, 17a are provided on the receiving bases 18, 18a.

Protective plates 20, 21, 21a are fixedly provided on the upper and both sides of each of the transport paths 14, 14a.

The members constituting the transfer section 5 have a high magnetic flux permeability to perform induction heating, and are made of a material that does not react with alternating magnetic flux and does not generate heat, such as an electrical insulator.
A material that is unrelated to magnetism and that allows the alternating magnetic flux to pass through without any support, specifically, the inner top plate 12, the inner bottom plate 12a, the columns 13, 13a
… And the pedestals 18, 18a are made of epoxy resin,
The chain 16, the mounting plates 17, 17a,..., The receiving plates 19, 19a and the protective plates 20, 21, 21a are made of SUS304 or inorganic ceramic having a predetermined thickness or more.

The transport section 5 is composed of two transport paths 14 and 14a, but may be one or two or more.

Next, the operation of the work coil according to the present invention will be described. When the induction heating furnace 1 is started, the part P is carried into the heating unit 4 by the transfer unit 5, and the wire coils in the work coils 3, 3a. , 6a... And pipe coils 7, 7a... Are supplied with alternating current of high frequency (not limited to high frequency) to generate an alternating magnetic flux. The eddy current is guided to the surface of the component P, and the surface of the component P is heated in a short time.

The work coils 3, 3a are connected from the water supply pipe 11 to the work coils 3, 3a.
To supply cooling water into the pipe coils 7, 7a at ...
In the process in which the cooling water passes through the pipe coils 7, 7a, the radiant heat from the wire coils 6, 6a is absorbed by the cooling water, and is discharged from the outlet 10a side to the outside through the drain pipe 11a. An increase in electric resistance due to overheating of the coils 6, 6a... Is suppressed, and the amount of current flowing through the work coils 3, 3a.

[0025]

In short, the present invention relates to an alternating magnetic flux generator for generating an alternating magnetic flux when energized, in which a current flows in a line coil 6, 6a... And a pipe coil 7, 7a. Are electrically connected so that the current flows through the pipe coils 7, 7a,..., Which are the cooling portions, so that an alternating magnetic flux can be generated.
By generating alternating magnetic fluxes from all of the constituent members 3a, heating efficiency can be improved, and the component P can be quickly heated.

Also, since one end of each of the pipe coils 7, 7a... Is connected to the water supply pipe 11 and the other end thereof is connected to the drain pipe 11a, the pipe coils 7, 7a. I can do it.

The wire coils 6, 6a,.
Are arranged alternately from the inner peripheral side to the outer peripheral side, so that the wire coils 6, 6a.
.. Are located between each other, the overheating prevention function of the pipe coils 7, 7a can be reliably exerted on the entire wire coils 6, 6a, that is, heat generated from the wire coils 6, 6a is generated by the pipe coils 7, 6a. 7a ... can be absorbed by the cooling water passing through and can be discharged to the outside, so that the wire coils 6, 6a ... are cooled and the electric resistance of the wire coils 6, 6a ... . Can be continuously generated from the wire coils 6, 6a..., And therefore, the wire coils 6, 6a.
…) Can fully utilize the magnetic flux generation function,
The component P can be quickly heated.

Also, wire coils 6, 6a,.
And the pipe coils 7, 7a... Are alternately arranged from the inner circumferential side to the outer circumferential side, and are electrically connected so that current flows in the same circumferential direction, so that the work coils 3, 3a. That is, since it is possible to improve the heating efficiency and to fully utilize the magnetic flux generation function of the work coils 3, 3a,..., The component P can be heated more quickly.

Also, the work coils 3, 3a... Are arranged in series, and a heating section 4 having both ends of each work coil 3, 3a. , And one end of each of the pipe coils 7, 7a... Is connected to a water supply pipe 11, and the other end is connected to a drain pipe 11.
a, respectively, to enable rapid overheating by generating alternating magnetic flux from both the constituent materials of the heating unit 4, ie, the wire coils 6, 6a... and the pipe coils 7, 7a. However, it is possible to provide the induction heating furnace 1 with one or both functions of enabling the wire coils 6, 6a... To generate a large amount of magnetic flux that causes overheating, so that the induction heating furnace 1 can be safely and efficiently provided. Its practical effect is extremely large, for example, it can be operated.

[Brief description of the drawings]

FIG. 1 is a front view of an induction heating furnace according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an enlarged view of a main part of a section taken along line XX of FIG. 2;

FIG. 4 is a front view of a work coil in which a cooling unit is integrated.

FIG. 5 is a plan view showing a state in which a water supply / drainage pipe is provided in the work coil of FIG. 4;

FIG. 6 is a sectional view taken along line YY of FIG. 4;

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a schematic side view showing a state in which work coils and cooling units in a conventional induction heating furnace are alternately arranged.

FIG. 9 is a front view of a conventional cooling unit.

FIG. 10 is a sectional view taken along the line ZZ of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction heating furnace 2 Casing 3, 3a ... Work coil 4 Heating part 5 Conveying part 6, 6a ... Wire coil 7, 7a ... Pipe coil 11 Water supply piping 11a Drainage piping

Claims (4)

[Claims] 1. An alternating magnetic flux generator for generating an alternating magnetic flux by energization, wherein a wire coil and a pipe coil made of a conductive metal are electrically connected so that a current flows in the same circumferential direction. Characterized in that one end is connected to a water supply pipe and the other end is connected to a drain pipe, respectively. 2. An alternating magnetic flux generator in an induction heating furnace for heating a metal part by generating an alternating magnetic flux by energization, wherein a wire coil and a pipe coil made of a conductive metal are formed.
A work coil integrated with a cooling part, wherein one end of a pipe coil is alternately arranged from an inner peripheral side to an outer peripheral side, and one end of a pipe coil is connected to a water supply pipe and the other end is connected to a drainage pipe. 3. An alternating magnetic flux generator for generating an alternating magnetic flux by energization, wherein a wire coil and a pipe coil made of a conductive metal are alternately arranged from an inner circumferential side to an outer circumferential side, and a current flows in the same circumferential direction. A work coil integrated with a cooling part, characterized in that it is electrically connected so as to flow, and one end of a pipe coil is connected to a water supply pipe and the other end is connected to a drain pipe. 4. An induction heating furnace for heating a metal part by generating an alternating magnetic flux when energized, wherein the induction heating furnace is a heating furnace.
In addition to arranging the work coils, a heating unit in which both ends of each work coil are connected to a power source is provided in the casing,
An induction heating furnace, wherein a transfer section for metal parts is disposed in a heating section, and one end of a pipe coil is connected to a water supply pipe, and the other end is connected to a drain pipe.