TWM517089U - Magnetic shielding induction heating module - Google Patents

Description

Magnetic shielding induction heating module

The present invention relates to a heating module, and more particularly to a magnetic shielding induction heating module.

In general, most of today's injection molding machines use resistive heating to heat the material tube. The disadvantage of this method is that the heating rate is slow, and it is often about 30% to 70% during heating. Energy consumption, excess energy consumption will result in increased manufacturing costs. Therefore, an induction heating method utilizing an electromagnetic induction effect has been employed to improve the disadvantages of the resistive heating method.

The so-called induction heating method is to generate an alternating magnetic field in the vicinity of the induction coil after a high-frequency current is applied to an induction coil. When the magnetically conductive workpiece approaches the induction coil, the electromagnetic induction occurs. The surface of the piece generates an electromotive force which generates an eddy current on the surface of the workpiece, and the eddy current generates heat due to the resistance of the heating member, so that the workpiece is heated.

The above induction heating technology uses the magnetic field generated by the induction coil of current to directly inductively heat the surface of the workpiece, which can be said to be a non-contact heating method, and the heating speed is higher than that of the conventional contact heating method using resistance heating. Faster.

However, how to effectively control the uniform distribution of the magnetic field of the induction coil is particularly important because the different positions on the workpiece to be heated are different from the distance of the induction coil, and the problem of uneven heating is likely to occur. For example, the closer the distance between the workpiece to be heated and the induction coil is, the greater the density of the magnetic field on the workpiece to be heated. In other words, the better the heating effect, the higher the temperature after heating, and vice versa. When the distance between the workpiece to be heated and the induction coil is further, the density of the magnetic field on the workpiece to be heated will be The smaller the heating effect is, the lower the heating temperature is, and the induced magnetic field itself will have the proximity effect of the magnetic field repulsive if the coil current direction is opposite, which leads to uneven heating and lower heating efficiency.

Referring to Figures 1, 2, and 3, most of the induction coils are currently inductively heated by a single layer of overlying induction coils 7 or vortex induction coils 8. The single layer of overlying induction coils 7 cannot be made by the proximity effect. Heating, so it is often necessary to match with a plurality of magnetic field concentrators 700 to improve, and the vortex induction coil 8 is also difficult to be heated because of the center of the coil, so that it is more uniform in the center where a few turns of the coil are needed. heating. In this way, whether the single-layer overlying induction coil 7 or the vortex induction coil 8 tends to make the design of the coil more difficult, and also causes an increase in manufacturing cost.

In general, although induction heating has the advantage of faster heating speed, it has the problem of poor heating uniformity. Moreover, in order to solve the problem of poor heating uniformity, it is necessary to increase the setting of the induction coil and cause a substantial increase in cost. . Therefore, how to find a method that can have better heating uniformity and save heating cost is one of the topics worthy of study.

Therefore, the object of the present invention is to provide a magnetic shield induction heating module suitable for an induction heater and comprising a material tube, an insulating sleeve, at least one induction coil, and a magnetic shielding sleeve.

The insulating sleeve is disposed on an outer surface of the tube. The induction coil is wound around the outer surface of the insulating sleeve and has a first end and a second end. The first and second ends are electrically connected to the induction heater.

The magnetic shielding sleeve is disposed to include a plurality of magnetic shielding spacers disposed on opposite sides of the induction coil. When the induction heater outputs an alternating current to the induction coil, an induced current is generated in the material tube, thereby generating Thermal energy.

Another technical means of the novel is in the above magnetic screen The shielding sleeve further comprises at least one magnetic shielding tube disposed on the outer layer of the induction coil.

Another technical means of the present invention is that the magnetic shielding tube body and the magnetic shielding spacer are made of a ferrite.

A further technical means of the present invention is that the induction coil is disposed between the two magnetic shielding spacers.

Another technical means of the present invention is that the magnetic shielding tube body is connected between the two magnetic shielding spacers.

The utility model has the advantages that the magnetic shielding sleeve and the insulating sleeve are used to wrap the induction coil, so that the magnetic lines of the alternating magnetic field in the vicinity of the induction coil are restricted by the magnetic shielding sleeve of the ferrite material to be non-dispersive. In turn, the induced electromotive force and the induced current are better, the heating effect on the tube is better, and the required current amount can be effectively saved. In addition, by means of the ferrite sleeve and the coating of the material tube, the magnetic lines of force can be completely covered, so that the magnetic field received by each part of the material tube is more uniform, so that the heating effect of the material tube is more Uniform, compared to the prior art, the present invention can obtain better and more uniform temperature distribution results.

5‧‧‧Magnetic Shield Induction Heating Module

51‧‧‧ material tube

52‧‧‧Insulation sleeve

53‧‧‧Induction coil

531‧‧‧ first end

532‧‧‧ second end

54‧‧‧Magnetic shielding sleeve

541‧‧‧Magnetic shielded body

542‧‧‧Magnetic shielding spacers

6‧‧‧Induction heater

1 is a schematic view of a device, illustrating a single-layer overlying induction coil of the prior art; FIG. 2 is a schematic view of a device illustrating a vortex induction coil of the prior art; FIG. 3 is a schematic view of the device, illustrating that the device is provided with a A single layer of overlying induction coil of a magnetic field concentrator; FIG. 4 is an exploded view of the apparatus to illustrate a preferred embodiment of the present invention; and FIG. 5 is a combination of apparatus for illustrating a combination of the preferred embodiment.

Relevant patent application features and technologies related to this new model The detailed description of the preferred embodiments with reference to the drawings will be clearly described below.

4 and 5, a preferred embodiment of the magnetic shielding induction heating module 5 of the present invention is applicable to an induction heater 6 and includes a material tube 51, an insulating sleeve 52, and at least one induction coil 53. And a magnetic shielding sleeve 54.

The insulating sleeve 52 is disposed on the outer surface of the tube 51, and the tube 51 is sleeved therein. The induction coil 53 is disposed on the outer surface of the insulating sleeve 52 and has a first end 531 and a second end 532. The first and second ends 531 and 532 are electrically connected to the induction heater 6 . When the material tube 51 is long, a plurality of induction coils 53 may be arranged, and each of the induction coils 53 is electrically connected to an induction heater 6.

The magnetic shielding sleeve 54 includes at least one magnetic shielding tube body 541 disposed on the outer layer of the induction coil, and a plurality of magnetic shielding spacers 542 disposed on opposite sides of the induction coil 53. The magnetic shielding tube body 541 is connected to the second The magnetic shielding spacers 542 are disposed between the two magnetic shielding spacers 542. The magnetic shielding sleeves 54 cooperate with the insulating sleeves 52 to wrap the induction coils 53.

In addition, the magnetic shielding tube body 541 is disposed between the two magnetic shielding spacers 542. When the material tube 51 is long and needs to be heated in sections, a plurality of induction coils 53 can be disposed on the material tube 51, and each Two magnetic shielding spacers 542 are disposed on two sides of an induction coil 53 , and the magnetic shielding tube body 541 is disposed between the two magnetic shielding spacers 542 so that magnetic lines of force generated by each of the induction coils 53 do not mutually The interference flows in the magnetic shielding tube body 541, the magnetic shielding spacer 542, and the material tube 5.

Preferably, the magnetic shielding tube body 541 and the magnetic shielding spacer 542 of the magnetic shielding sleeve 54 are made of a ferrite material, and the ferrite material is made of nickel-zinc ferrite (Ni-Zn ferrite) or It is composed of Mn-Zn ferrite. In actual implementation, it can also be made of other magnetic shielding materials, and should not be limited to this.

When the induction heater 6 sends an alternating current (high-cycle current), when the first end 531 and the second end 532 flow into the induction coil 53, an alternating magnetic field is generated around the induction coil 53. Since the magnetic shielding sleeve 54 cooperates with the material tube 51 to wrap the induction coil 53 , the induction coil 53 forms an induced electromotive force in the material tube 51, thereby generating an induced current (commonly known as eddy current). When the induced current in the tube 51 flows in the resistance in the material of the tube 51, heat is generated, causing the tube 51 to generate a high temperature to provide a heating effect.

It is worth mentioning that the magnetic shielding sleeve 54 of the preferred embodiment shields the magnetic force generated by the induction coil 53 and concentrates and covers most of the magnetic lines of force, thereby increasing the strength of the induced magnetic field. And uniformity, when the induced current is generated, the induced current can be effectively utilized to generate thermal energy, so that the tube 51 has better heating speed, energy efficiency and temperature uniformity to provide optimum heating efficiency.

It should be noted that the material tube 51 is often divided into multi-stage heating and multi-stage temperature control under the heating requirement of plastic plasticizing. When the material tube 51 is divided into multiple sections, it is easy to cause the adjacent two induction coils 53. The generated magnetic fields interfere with each other or are offset.

Therefore, the present invention is provided with two magnetic shielding spacers 542 at both ends of each induction coil 53, which can effectively isolate the magnetic lines of the segment induction coils 53 to avoid interference of the magnetic field generated by each induction coil 53 or The offset effects are offset, and the heating effect at the junction of the induction coils 53 is greatly reduced.

Please refer to Annexes 1 and 2. This Annex 1 is the magnetic flux distribution diagram of the heating module that does not normally use magnetic shielding. The accessory 2 is the temperature distribution diagram of the material tube which is generally not used for magnetic shielding. The magnetic lines of force are almost formed outwardly, resulting in a poor effect of the induced electromotive force (ie, induced current), which requires a large amount of current. In addition, the magnetic lines of force generated by the two adjacent induction coils 53 are mutually influential, so that the heating temperature in the tube 51 cannot be uniform. Evenly, the temperature near the two coils in the center of the tube 51 is still almost below 275 degrees Celsius, and only the temperature on both sides of the tube is between 280 and 290 degrees.

Referring to the attachments 3 and 4, the attachment 3 is a magnetic line distribution diagram of the preferred embodiment, and the attachment 4 is a temperature distribution diagram of the preferred embodiment. The magnetic shield sleeve 54 used in the present invention is fully covered. The two induction coils 53 are respectively wrapped therein, and the magnetic lines of force can be enclosed and concentrated, which has the effect of reducing power consumption.

The two magnetic shielding spacers 542 completely isolate the two magnetic fields generated by the two induction coils 53 to avoid mutual interference of the coils of different sections, so that the heating temperature of the material tube 51 is uniform at about 290 degrees, except The material tube 51 has a small portion on both sides of the tube 51. Therefore, it can be seen that the novel heating method has better heating effect and is more energy-saving.

In summary, the present invention utilizes the magnetic shielding sleeve 52 to cover the induction coil, so that the magnetic lines of the alternating magnetic field around the induction coil 53 can be covered therein without being dispersed outward, thereby causing the induced electromotive force generated. The induction current effect is better, the heating effect of the material tube 51 is better, and the required power consumption can be saved. In addition, the induction coils of each section can be further used by the plurality of magnetic shielding spacers 542. The magnetic lines of the 53 are separated to prevent the two magnetic fields from interfering with each other and offsetting, so that the magnetic field received by each of the tubes 51 is more uniform, and the heating effect of the tube 51 is more uniform, so the new type can be achieved. The purpose.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent.

5‧‧‧Magnetic Shield Induction Heating Module

51‧‧‧ material tube

52‧‧‧Insulation sleeve

53‧‧‧Induction coil

531‧‧‧ first end

532‧‧‧ second end

54‧‧‧Magnetic shielding sleeve

541‧‧‧Magnetic shielded body

542‧‧‧Magnetic shielding spacers

Claims (5)

A magnetic shielding induction heating module is suitable for an induction heater and comprises: a material tube; an insulating sleeve disposed on an outer surface of the material tube; at least one induction coil wound around the insulating sleeve The surface has a first end and a second end, the first end and the second end are electrically connected to the induction heater; and a magnetic shielding sleeve includes a plurality of magnetic shielding intervals disposed on opposite sides of the induction coil When the induction heater outputs an alternating current to the induction coil, an induced current is generated in the tube to generate thermal energy. The magnetic shielding induction heating module of claim 1, wherein the magnetic shielding sleeve further comprises at least one magnetic shielding tube disposed on the outer layer of the induction coil. The magnetic shielding induction heating module according to claim 2, wherein the magnetic shielding tube body and the magnetic shielding spacer are made of a ferrite. The magnetic shielding induction heating module of claim 3, wherein the induction coil is disposed between the two magnetic shielding spacers. The magnetic shield induction heating module of claim 4, wherein the magnetic shield tube is connected between the two magnetic shield spacers.