CN1090086A - Electromagnetic heating degaussing device - Google Patents

Abstract

The invention provides an electromagnetic heating demagnetizing device, which comprises a U-shaped iron core with two vertical open ends, wherein the two vertical open ends are respectively wound with a coil, one ends of the coils are mutually connected in series, the other end of the coils is connected in parallel with an alternating current power supply with preset frequency change, the two open ends of the U-shaped iron core are simultaneously enabled to generate staggered and variable magnetic lines of force by the coils, a straight iron rod is transversely arranged on the two open ends of the U-shaped iron core and used for penetrating a bearing to heat to a proper temperature, or a non-magnetic conductive plate is arranged on the two open ends and can be used for placing a magnetic conductive vessel to heat or demagnetize a magnetized article.

Description

The invention relates to an electromagnetic device, which is used in metal heating or rapid demagnetization of magnetized objects.

The application of the present invention in metal heating is divided into two purposes, one is industrial heating and the other is commercial heating. The industrial heating application is mainly used for bearing assembly, heating to expand the volume and expand the inner hole to facilitate assembly on a shaft. In commercial application, it is mainly used for heating food or drinking water, so as to achieve the same heating function and purpose different from the structure of the existing induction cooker. The present invention can also be used for the degaussing of magnetized products, such as the rapid degaussing of audio tapes and video tapes to make them blank tapes, or the rapid degaussing of industrial product parts.

As far as the existing technology is known, the bearing must be tightly fitted during assembly. The common way is to press fit the combination with a specific tool, but in many cases it is not possible to use a special tool to press fit the bearing. Generally, if the bearing is installed by knocking, it is usually impossible to install it accurately. Positioning the bearing will affect the service life and operational flexibility of the bearing. Therefore, it is better to heat the bearing to a predetermined temperature to expand the inner hole, so that the bearing sleeve can be accurately and quickly positioned on the shaft. In the existing bearing heating method, the bearing is heated in high-temperature oil, which not only takes a long time to heat, but also uses inconvenient equipment.

As for the common electromagnetic heating furnace used for commercial purposes at present, the AC power is converted into DC power, and then the power is switched at a high frequency (about 30KHZ) by a very complicated control circuit. The current passes through an induction coil to generate an alternating magnetic field. , using the alternating magnetic field to induce the heating of the pot container above it to heat the food, the overall control circuit is very complicated and the manufacturing cost is high.

Regarding degaussing, some components in the manufacturing process of industrial products will be magnetic and must be degaussed. The usual degaussing device uses electronic circuit control-circuit switching to alternately change the direction of the current flowing through a coil, and gradually during the switching process Reduce the voltage applied to the coil until it reaches zero voltage, that is, the area of the curve formed by the hysteresis loop gradually shrinks to the origin, and then the effect of degaussing is achieved. This kind of degaussing device is also preset with a complex electronic control circuit, which of course also increases the cost and cost of the degaussing device.

The main purpose of the present invention is to provide an electromagnetic heating and degaussing device, which can achieve heating and degaussing effects on metal object components by applying the electromagnetic principle with a simple structural design, and can provide a simple metal heating device or degaussing of objects at a lower cost device.

The second object of the present invention is to provide an electromagnetic heating degaussing device, which does not require a special control circuit, and has a simple structure, small volume, convenient use and low failure rate.

Another object of the present invention is to provide an electromagnetic heating and degaussing device, which is suitable for heating and degaussing in industrial and commercial applications, and is a multi-purpose electromagnetic device.

Green is that the electromagnetic heating degaussing device of the present invention includes a U-shaped iron core, which is composed of multiple U-shaped silicon steel sheets. The iron core has a coil with an appropriate number of turns on each of its open ends. The winding directions of the two coils are the same. That is to say, the winding is clockwise or counterclockwise, one end of the two coils is connected in series, and the other end of the two coils is connected to an AC power supply in parallel, so that the open end of the U-shaped core generates a staggered magnetic field, that is, the core The open end of the core generates two magnetic lines of force in different directions at the same time, and the two magnetic fields in different directions alternately change according to the AC power supply; then a conductive magnetic bar can be placed between the open ends of the core to concentrate the direction of the magnetic force lines, and the iron bar goes up A bearing can be quickly heated to the set temperature by induction. A non-magnetic plate can be placed on the top of the U-shaped iron core. The top surface of the non-magnetic plate can be used to place a magnetic metal container to induce the staggered magnetic field. Rapidly heats up and is used to heat food or drinking water in containers. If the material of the magnetized article passes through the staggered magnetic field area at the open end of the U-shaped iron core, the regular molecular arrangement of the magnetized article will be disordered to achieve the purpose of demagnetization.

The detailed structure, composition and characteristics of the present invention can be fully understood from the following embodiments in conjunction with the accompanying drawings.

Fig. 1 is an equivalent circuit structure and a schematic diagram of a magnetic circuit of an electromagnetic heating degaussing device of the present invention;

Fig. 2 is the schematic diagram of the magnetic circuit of the electromagnetic heating degaussing device of the present invention plus load;

Figure 3 is a schematic diagram of an application of the present invention such as heating a bearing;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a schematic diagram of another application example of the present invention heating a pot;

Fig. 6 is a schematic diagram of another application example of the present invention for degaussing an item.

Please refer to Fig. 1 first, the structure of the electromagnetic heating degaussing device of this invention includes a U-shaped iron core (10) composed of a plurality of U-shaped silicon steel sheets stacked, and its two upright open ends (110, (12) are respectively wound with two Winding coils L1 and L2, the two coils L1 and L2 are connected in series and then in parallel with an AC power supply VAC, when the AC power supply is connected to a power supply with a predetermined frequency change (such as 60HZVAC), two of the U-shaped iron core (10) are opened An alternating magnetic field φ1, φ2 is generated between terminals (11) and (12), and the magnitude of the alternating magnetic field changes with the voltage and current and the frequency of the AC power supply VAC.

The above-mentioned electromagnetic heating and degaussing device uses the series-parallel connection between the two coils L1, L2 and the power supply VAC, so that the two-wire coils L1 and L2 belong to the same primary side for the power supply, and can directly generate alternating current at the open end of the U-shaped core. Magnetic field, using the alternating magnetic field to achieve the purpose of heating metal or demagnetizing.

As shown in Figure 2, when a straight iron rod (14) is placed between the two open ends of the U-shaped iron core (10), the magnetic interlaced magnetic force lines φ1 and φ2 between the two open ends (11) and (12) are obtained Concentrate through this straight rod iron rod (14), and the cross-sectional area A1 of this straight rod iron rod (14) contacting with the open end (11), (12) of this U-shaped iron core (10) is about this open end ( 11), (12) one-third of the cross-sectional area of the iron core, so as to guide the magnetic plus line to pass through the straight iron rod (14) more concentratedly, so that the metal element can be worn on the straight iron rod, which will make the metal element Eddy currents are induced to heat the metal element.

As shown in Figures 3 and 4, the straight iron rod (14) shown in Figure 2 is used to wear a bearing (15). Alternating magnetic field lines φ1, φ2 pass through the straight iron rod (14) and bearing (15) and induce eddy current to heat the bearing (15). The heating time and temperature can be changed or changed by the voltage, current and frequency of the power supply VAC. Adjustment, so the bearing can be controlled to be heated to an appropriate temperature, such as about 200°C, the diameter of the inner hole can be enlarged, and the bearing (15) can be easily installed on a shaft for positioning, so as to facilitate the precise installation of the bearing.

The above-mentioned electromagnetic heating degaussing device applied to the U-shaped core (10) of the heating bearing is small in size, and can easily and quickly heat the shaft (15) to an appropriate temperature. It is very convenient to carry and use, and it is easy to control its heating temperature range. The installation of bearings in the industry is of great help.

As shown in Figure 5, the electromagnetic heating degaussing device is provided with a non-magnetic plate (16) at the top of the open ends (11) and (12) of the U-shaped iron core (10), and the plate (16) can be used to accommodate the U-shaped A part of the shell of the iron core (10), but must be able to withstand the temperature of heating. Place a magnetically permeable pot (17) above the flat plate (16), and the interlaced magnetic field lines φ1 and φ2 between the two open ends (11) and (12) of the U-shaped iron core (10) will pass through the pot (17 ) bottom, and induce the pot (17) to generate eddy current and generate heat, which can heat the drinking water or food in the vortex (17). The heating temperature and time can also be adjusted by changing the voltage, current or frequency of the power supply VAC, which directly It is very easy to control the heating by using the AC power supply, and there is no need for a complicated control circuit that converts the AC power supply to a DC power supply and then controls its output power like a general induction cooker, and the invention achieves the purpose of heating with a simple structure, not only low production cost but also significantly reduces the use The failure rate is an excellent heating device.

As shown in Figure 6 again, the structure of the electromagnetic heating degaussing device is similar to that of Figure 5, and it is made into an appropriate volume shape to move on the flat plate (16) at the top of the two open ends (11) and (12) of the U-shaped iron core. A magnetized item (18), whose magnetic distribution is disrupted by the action of the interlaced magnetic fields φ1 and φ2, achieves the purpose of degaussing. It can be applied to rapidly degaussing audio tapes and video tapes into blank tapes, and can also be used in industrial Component degaussing works quickly.

According to the description of the above-mentioned embodiments, the external shell is omitted, but the structure and application of the electromagnetic heating degaussing device of the present invention can be fully understood. It can be widely used in heating and degaussing purposes in the industrial and commercial circles and daily life with its simple structural design , and the design is completely different from the existing electromagnetic heating or degaussing devices. Of course, the application of the above embodiments is only for illustration, and the present invention will include other equivalent applications.

To sum up, the present invention is a new invention of a heating and degaussing device, and has great industrial application value, and complies with the requirements of invention patent application, so the patent application is filed according to law.

Claims (3)

1, a kind of electromagnetic heating magnetic eraser, it is characterized in that, comprise that a U sections heart has two upright open ends, this two upright open end respectively is wound with coil, the series connection mutually of one of this two coil end, its other end is connected to an AC power to supply the alternating voltage of preset frequency variation, and this two coil makes two open ends of the U sections heart produce the staggered magnetic line of force that changes simultaneously, generates heat or demagnetizes with the magnetic conductivity object that presets of responding to this place.

2, electromagnetic heating magnetic eraser according to claim 1 is characterized in that, horizontal on these U sections heart two open ends have a straight-bar iron staff, can wear a bearing on this straight-bar iron staff and be heated to predetermined temperature.

3, electromagnetic heating magnetic eraser according to claim 1, it is characterized in that, these U sections heart two open ends are provided with a non-magnetic plate, can respond to this magnetic conductivity vessel bottom heating or make the demagnetization of magnetization article with the staggered magnetic line of force between two open ends for placing magnetic conductivity vessel or magnetized article on this non-magnetic plate.

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