CN115968068A

CN115968068A - Heating coil and heating device

Info

Publication number: CN115968068A
Application number: CN202211643550.6A
Authority: CN
Inventors: 李福囤; 董磊; 徐杰; 刘磊; 胡楠; 范高峰
Original assignee: Henan Enthalpy New Material Co ltd
Current assignee: Henan Enthalpy New Material Co ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-04-14

Abstract

The invention provides a heating coil and a heating device, which relate to the technical field of heating coils, and comprise a coil body, wherein the coil body is constructed into a metal induction coil pipeline wound by double-circuit parallel pipelines and is provided with a parallel first spiral section, a second spiral section integrally formed with the first spiral section and a bending section for connecting the first spiral section and the second spiral section, one end of the first spiral section, which is far away from the bending section, is provided with a first outlet, and the bending section is provided with a first inlet, so that a cooling working medium is input from the first inlet and is output from the first outlet; the cooling medium is respectively input from the first inlet and the second inlet of the coil body, and the cooling medium is output from the first outlet and the second outlet, so that the path of the cooling medium passing through the coil body is shortened, the cooling effect of the coil body is improved, and the temperature of the cooling medium finally discharged to the outside of the coil body is reduced.

Description

Heating coil and heating device

Technical Field

The invention relates to the technical field of heating coils, in particular to a heating coil with a good cooling effect and a heating device.

Background

The coil is generally spiral, the spiral coil is sleeved outside the metal workpiece, and after the coil is electrified, the temperature of the metal workpiece can be rapidly raised according to the electromagnetic induction principle, for example, when the metal spiral finned tube is rolled, the coil can intermittently work for facilitating the rolling forming of the subsequent spiral finned tube;

as is well known, when a coil is used for heating a metal workpiece, the temperature of the coil is high, the thermal resistance of the coil is high, electric energy is wasted, and the service life of the coil is shortened, so that air cooling or water cooling of the coil is very necessary;

for example, chinese patent CN107567126B discloses an electromagnetic heating coil with an automatic cooling effect, the coil body is a metal hollow tube, air enters from one end of the coil, and is discharged from the other end, thereby absorbing the heat of the coil and improving the cooling effect;

for another example, the chinese patent CN113993238A relates to a high-frequency heating induction coil, the induction coil body is an induction coil pipe wound by double-loop parallel pipes, the parallel pipes are mutually communicated at the tail end 11, the head ends of the parallel pipes are respectively provided with an inlet port 12 and an outlet port 13, the induction coil body is wound on the heated object when heating, the induction coil body is heated, the working medium inside the induction coil pipe absorbs heat, the working medium enters the radiator after being heated and expanded to perform heat dissipation and cooling, and automatic circulation heat dissipation is performed through the communication between the induction coil pipe and the radiator pipe;

however, both the air cooling and water cooling methods have a problem of poor cooling effect of the coil, and a cooling medium (air or liquid) is input from one end of the coil at a low temperature, so that the cooling effect is optimal, the self temperature of the cooling medium is increased after the cooling medium and the coil are sufficiently heat-exchanged as the cooling medium flows in the coil, and when the cooling medium reaches the second half spiral section of the coil, the heat absorption capacity of the cooling medium is greatly reduced, the whole spiral coil cannot be sufficiently cooled, and of course, the temperature of the cooling medium finally discharged from the coil is also high, so that a heating coil with good cooling effect is provided.

Disclosure of Invention

The invention aims to provide a heating coil and a heating device, and aims to solve the problems that in the prior art, the temperature of a cooling medium conveyed to the tail end of the heating coil is high, and the cooling effect of the heating coil is poor.

In order to realize the purpose, the invention adopts the following technical scheme: a heating coil comprises a coil body, wherein the coil body is constructed into a metal induction coil pipeline wound by double-loop parallel pipelines and is provided with a parallel first spiral section, a second spiral section integrally formed with the first spiral section and a bending section for connecting the first spiral section and the second spiral section, one end of the first spiral section, far away from the bending section, is provided with a first outlet, and the bending section is provided with a first inlet for a cooling working medium to be input from the first inlet and output from the first outlet; and a second outlet is formed in one end, far away from the bent section, of the second spiral section, and a second inlet is formed in the bent section, so that a cooling working medium can be input from the second inlet and output from the second outlet.

According to a further technical scheme, the first spiral section is communicated with the second spiral section through the bending section.

According to a further technical scheme, the first inlet is connected with a first connecting pipe, and the inlet is connected with a second connecting pipe.

According to the further technical scheme, a first conducting strip is connected to the position close to the first outlet, and a second conducting strip is connected to the position close to the second outlet.

The further technical scheme of the invention is that the cooling medium passing through the coil body is air or water.

According to a further technical scheme, the coil is made of copper.

According to a further technical scheme, the cross section of the coil body is circular or square.

According to a further technical scheme, the diameter of the first spiral section is the same as that of the second spiral section.

A further technical solution of the present invention is that the diameter of the first helical section is larger than the diameter of the second helical section.

A further aspect of the invention is that the first helical section is arranged outside the helix of the second helical section and at least partially covers the second helical section.

According to a further technical scheme, the first spiral section is not in contact with the second spiral section.

The further technical scheme of the invention is that the coil body is provided with an outer insulating layer, and the first spiral section is in contact with or not in contact with the second spiral section.

A heating device comprising the heating coil of any one of the above.

The invention has the beneficial effects that:

the cooling medium is respectively input from the first inlet and the second inlet of the coil body, the cooling medium input through the first inlet is output from the first outlet, and the cooling medium input through the second inlet is output from the second outlet, so that the path of the cooling medium passing through the coil body is shortened, the cooling effect of the coil body is improved, and the temperature of the cooling medium finally discharged to the outside of the coil body is reduced.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of a heating coil of the present invention;

fig. 2 is another perspective view of the first embodiment of the heating coil of the present invention;

fig. 3 is a schematic view of still another perspective structure of the first embodiment of the heating coil of the present invention;

fig. 4 is a schematic perspective view of a second embodiment of a heating coil of the present invention;

fig. 5 is another perspective view illustrating a second embodiment of a heating coil according to the present invention;

FIG. 6 is a schematic side view of a heating coil of a second embodiment of the present invention;

fig. 7 is a schematic perspective view of a heating coil according to a third embodiment of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

Referring to fig. 1 to 3, which are first embodiments of the present invention, an electromagnetic induction heating coil includes a coil body 1, the coil body 1 is a metal induction coil pipe wound by a double-loop parallel pipe, and has a parallel first spiral section 11 and a second spiral section 12 integrally formed with the first spiral section 11, the first spiral section 11 and the second spiral section 12 are communicated with each other at a bent section 13, two ends of the coil body 1 are a first outlet 11a and a second outlet 12a, respectively, the bent section 13 is provided with a first inlet 11b and a second inlet 12b, that is, the first outlet 11a, the second outlet 12a, the first inlet 11b and the second inlet 12b are communicated with each other, and it is emphasized that: the first spiral section 11 and the second spiral section 12 may also be disconnected at the bend 13, thereby separating the first inlet 11b and the second inlet 12 b.

The coil body 1 is a metal hollow pipe shape, the cross section of the coil body can be in various shapes such as a circle, a square and the like, the heating coil can heat a metal workpiece in a high-frequency or medium-frequency heating mode, a first connecting pipe 16 is fixed at a first inlet 11b in a welding mode, a second connecting pipe 17 is fixed at a second inlet 12b in a welding mode, a first conducting strip 20 is welded at a position close to a first outlet 11a, and a second conducting strip 30 is welded at a position close to a second outlet 12a, so that the first conducting strip 20 and the second conducting strip 30 are respectively connected to the positive electrode and the negative electrode of a circuit.

When the high-frequency or low-frequency alternating current coil is in work, when high-frequency or low-frequency alternating current passes through the coil body 1, an alternating magnetic field surrounding the coil body 1 is generated, a metal workpiece is prevented from being arranged in the coil body 1, the workpiece belongs to a conductor, the magnetic field penetrates through the workpiece in the coil body 1 to generate induced current, a closed loop is formed, namely, eddy current is formed, when the eddy current flows in the metal workpiece, electrons in the workpiece are very active, friction heating is caused, and the conductor can be rapidly heated.

During cooling, the metal workpiece is inserted into the coil body 1, the temperature of the metal workpiece is raised by the electromagnetic induction principle, when the coil body 1 is cooled, gaseous or liquid cooling medium (water or air) is respectively input from the first inlet 11b and the second inlet 12b, the cooling medium input through the first inlet 11b is output from the first outlet 11a, and the cooling medium input through the second inlet 12b is output from the second outlet 12a, so that the path of the cooling medium passing through the coil body 1 is shortened, the cooling effect of the coil body 1 is improved, and the temperature of the cooling medium finally discharged to the outside of the coil body 1 is reduced.

In this embodiment, the first helical section 11 and the second helical section 12 have substantially the same diameter.

Referring to fig. 4 and 6, a second embodiment of the present invention is shown, which is different in that the first spiral section 11 and the second spiral section 12 have different diameters and the spiral directions are the same; the diameter of the first helical section 11 is larger than the diameter of the second helical section 12 and the first helical section 11 is arranged outside the helix of the second helical section 12, the first helical section at least partially covering the second helical section, specifically explained as the first helical section 11 can partially or completely cover the second helical section 12, seen from a side view of the coil body 1; other structures are basically consistent, and the embodiment has the advantages that: the length of the whole heating coil can be greatly shortened, and the heating efficiency of the metal workpiece is improved.

It should be noted that: the first spiral section 11 and the second spiral section 12 in the above two embodiments of the coil body 1 may not contact each other, or may contact each other partially or completely, and when the first spiral section 11 and the second spiral section 12 contact each other at least partially, the coil body 1 needs to be provided with an outer insulating layer (not shown in the figure).

Referring to fig. 7, a third embodiment of an electromagnetic induction heating coil is the same as the second embodiment in that the diameters of the first spiral section 11 and the second spiral section 12 are different, the diameter of the first spiral section 11 is larger than the diameter of the second spiral section 12, and the first spiral section 11 is arranged outside the spiral of the second spiral section 12, the first spiral section at least partially covering the second spiral section;

the difference lies in that: the spiral directions of the first spiral section 11 and the second spiral section 12 are different, the first spiral section 11 is in a positive spiral direction, and the second spiral section 12 is in a negative spiral direction; the tail part of the first spiral section 11 is provided with a first contact section 111, the second spiral section 12 is provided with a second contact section 121, one ends of the first contact section 111 and the second contact section 121 are basically in the same direction, and the first contact section 111 and the second contact section 121 are partially connected into a whole; the embodiment can also greatly shorten the length of the whole heating coil and improve the heating efficiency of the metal workpiece.

The invention also provides a heating device, which comprises the coil body 1.

Claims

1. A heating coil characterized by: the metal induction coil comprises a metal induction coil pipeline which is formed by winding a coil body into a double-loop parallel pipeline, and comprises a parallel first spiral section and a second spiral section which is integrally formed with the first spiral section, wherein a first outlet and a second outlet are respectively arranged at two ends of the coil body, and an inlet is arranged at the joint of the first spiral section and the second spiral section, so that a cooling working medium enters from the inlet and is output from the first outlet and the second outlet.

2. The heating coil of claim 1 wherein the first helical segment communicates with the second helical segment through a bend segment.

3. The heating coil of claim 2 wherein the bend section is provided with a first inlet and a second inlet, and wherein the cooling medium is capable of entering the first helical section tangentially from the first inlet and the cooling medium enters the second helical section tangentially from the second inlet.

4. The heating coil of claim 3 wherein said first inlet is connected to a first connecting tube, said second inlet is connected to a second connecting tube, a first conductive strip is connected adjacent said first outlet, and a second conductive strip is connected adjacent said second outlet.

5. The heating coil of claim 1 wherein the cooling medium passing through the coil body is air or water and the coil is copper.

6. The heating coil according to any one of claims 1 to 5 wherein the diameter of the first helical section is the same as the diameter of the second helical section.

7. The heating coil of claim 1 wherein the diameter of the first helical section is greater than the diameter of the second helical section.

8. The heating coil of claim 7 wherein the first helical segment is disposed outside of and at least partially covers the helix of the second helical segment, and the direction of the helix of the first helical segment is the same as the direction of the helix of the second helical segment.

9. The heating coil of claim 7 wherein the first helical segment is disposed outside of and at least partially overlapping the helix of the second helical segment, and the first helical segment has an opposite helical direction to the second helical segment.

10. The heating coil according to any one of claims 1 to 5 wherein the first helical segment is not in contact with the second helical segment.

11. The heating coil according to any one of claims 1 to 5, wherein the coil body has an outer insulation layer, and the first helical section is at least partially in contact with or not in contact with the second helical section.

12. A heating device, characterized in that it comprises a heating coil according to any one of claims 1 to 11.