KR100345157B1 - heating roll with 3-phase induction coil for decreasing the difference of surface temperature and increasing the efficiency of power supply - Google Patents

Abstract

The present invention is to install the induction coil and core of the induction heating heating roll in three blocks, and by applying three-phase alternating current to connect each phase to each coil block, the magnetic force lines generated in the outer cylinder by the induction coil to each three blocks It is to generate power, and to control the power of each phase separately to supply more power to the coils in the left and right outward direction where the temperature is lowered to make the entire longitudinal temperature distribution even more uniform. In addition, the use of three-phase power than the use of single-phase power is higher in terms of power efficiency, to reduce the capacity of the induction coil and the like used.

Description

Heating roll with 3-phase induction coil for decreasing the difference of surface temperature and increasing the efficiency of power supply}

The present invention relates to a heating roll made of a three-phase induction coil for reducing surface temperature variation and increasing power efficiency in an induction heating type heating roll by an induction coil.

Many cylinder rolls are used in the fabrication and processing of various fabrics in the soft packaging, textiles, and sheet metal coil industries. Among them, heat is applied to the cylinder rolls to conduct heat to the fabric for surface processing or heat treatment such as laminating, seasoning, and coating. Heating rolls are used. In the heating method of such a heating roll, in Korea, a heating roll has been manufactured and used by inserting a heater into the cylinder to apply heat or heating oil to a boiler to circulate the inside of the cylinder. Heating rolls of this type are easy to manufacture and are inexpensive, so they are manufactured and used by many domestic companies. Meanwhile, Japan's Tokuden and Kano manufacture and sell an induction heating type heating roll which is a self-heating method by induction current which is a much more advanced method. This induction heating type heating roll has the advantages of uniform surface temperature distribution, excellent thermal efficiency, good durability, and simple peripheral equipment.

When heat is transferred to the fabric by the heating roll, it is very important that the temperature is uniformly transmitted to the left and right sides of the fabric contacting the heating roll. If there is a temperature deviation in the center portion and the edge of the heating roll that the fabric touches, the heat treatment of the fabric does not become uniform, causing problems in quality.

The temperature deviation of the heating roll occurs because heat is concentrated at the central portion of the heating roll, and at the edge, heat is deprived by a side bracket or the like.

When the length of the heating roll is long, such a temperature deviation becomes more severe, causing serious problems in the quality of the fabric. The temperature deviation of the heater insertion or oil circulation type rolling roll is very large, about 10 ° C. In the case of the single-phase induction heating type heating roll, the temperature of the central portion is high because the density of the induction current is theoretically higher than that of the edge. The deviation is somewhat large.

Therefore, in order to solve this problem, a Japanese induction heating heating roll manufacturing company inserts a heat pipe, which is a high-efficiency heat conduction method, into the outer cylinder of the heating roll to spread the temperature of the central portion rapidly, thereby reducing the overall temperature deviation by 1 to 2 ° C. In order to compensate for this problem, the Korean patent application 17956 also shows a technique of inserting a thermal diffusion structure into the outer cylinder.

The present invention separates and mounts the induction coil and the core of the induction heating type heating roll into three blocks, and connects each phase to each coil block by applying three-phase alternating current, thereby generating magnetic force lines generated in the outer cylinder by the induction coil. It is to generate a block, and to separately control the power of each phase to supply more power to the coil in the left and right outward direction where the temperature is lowered so that the entire longitudinal temperature distribution is more uniform. In addition, the use of three-phase power than the use of single-phase power is higher in terms of power efficiency, to reduce the capacity of the induction coil and the like used.

1 is a cross-sectional view of a conventional single-phase induction heating roll

2 is a structural cross-sectional view of the AC three-phase power heating roll of the present invention

<Description of the symbols for the main parts of the drawings>

(1): outer cylinder (2): bobbin

(3): core (4): induction coil

(5,6,7): Induction coil (8,9,10,11): Ring

(12) Temperature sensor

1 is a cross-sectional view of a conventional single-phase induction heating roll. The side bracket shown in the figure is not related to this technology and thus is simplified unlike the actual structure. The slip ring structure is also omitted.

2 is a structure of the AC three-phase power heating roll adopted in the present technology. The outer cylinder (1) is a cylinder of the heating roll to which the fabric touches, and becomes the surface of the heating roll to which the fabric directly touches. As a general iron material, it is treated with chrome coating or Teflon coating according to the type of heat treatment of the fabric and thus high hardness and roughness are achieved. Keep it. In the case of the induction heating method, when an AC current flows through the induction coil inside the outer cylinder 1, a magnetic force line is generated in the outer cylinder 1, and a current is induced in the direction perpendicular to the magnetic force line, thereby generating heat. Therefore, the induction heating heating roll is heat generated by the outer cylinder 1 itself, the thermal efficiency is good and the surface temperature distribution is uniform. The core 3 and the induction coil 4 are wound around the bobbin 2, and when an alternating current flows therethrough, magnetic lines of force are generated in the outer cylinder 1. In Fig. 2, unlike in Fig. 1, the length of the heating roll is divided into three equal parts, and the same guide coils 5, 6, and 7 are inserted into the respective parts. The rings (8), (9), (10) and (11) are made of ferromagnetic material, such as pure iron, which separates the divided induction coils (5), (6), (7) and the core (3) from each other.

The temperature sensor 12 measures the temperature inside the outer cylinder 1 to control the amount of induction current by the temperature controller to control the heating temperature.

Example

In the induction heating type heating roll as shown in Fig. 2, the induction coils 5, 6, 7 and the core 3 are divided into three blocks on the bobbin 2. Between the block and the block is fitted with rings (8, 9, 10, 11) of a material close to the ferromagnetic material such as pure iron to separate the adjacent induction coil and the core. Subsequently, three-phase alternating current is applied to each induction coil so that an alternating current corresponding to each phase flows to each coil block.

In the case of the induction coil (5), when current flows in this coil, the magnetic force lines generated along the inner core are bent in the ring (8) to be transferred directly to the outer cylinder (1) and flow back into the core through the opposite ring (9) to become independent. Magnetic circuits are constructed. In the case of the induction coil (6), magnetic lines of force flow through the rings (9) and (10), and in the case of the induction coil (7), flow through the rings (10) and (11). As a result, magnetic lines of force occur separately in each of the three blocks. At this time, the rings (8) (9) (10) and (11) have a minimum distance from the outer cylinder (1) so that the magnetic force lines can flow well into the outer cylinder (1) while avoiding contact with the rotating outer cylinder (1). Good to do.

By using this phenomenon, the power of each phase can be controlled separately. For example, if the power is compensated for by further supplying power to the coils in the left and right outward directions where the temperature decreases, the entire longitudinal temperature distribution can be made uniform. .

In addition, the use of three-phase power than the use of single-phase power can be higher in terms of power efficiency, it is possible to reduce the capacity of the induction coil, etc. to be used, and thus to enable the use of a small diameter coil.

This 3-phase induction heating roll is equipped with 3 blocks of induction coil and core inside. When 3-phase alternating current is applied, internal magnetic circuit is generated by 3 blocks. This makes the longitudinal temperature distribution uniform. For long heating rolls this structure is more effective and the number of blocks can be further increased according to this principle. In addition, the use of three-phase power than the use of single-phase power is higher in terms of power efficiency, it is possible to reduce the capacity of the induction coil and the like.

(Variants, applications and legal interpretations)

The present invention is not limited to the structure of the embodiments, but modifications and applicable design modification structures are also included in the claims.

According to the present invention, by induction coil and core of the induction heating type heating roll in the three-phase method, even in the case of long length heating roll can further reduce the surface temperature deviation can be expected to improve the quality of the fabric, single phase Compared to the power efficiency, the capacity of the induction coil can be reduced.

Claims (3)

Induction heating type heating roll by induction coil, Each induction coil (5) (6) (7) and the core (3) are wound in three blocks on the bobbin (2), and between each block a ring of ferromagnetic material (8) (9) (10) (11) Heating roll made of three-phase induction coil to reduce surface temperature deviation and increase power efficiency, characterized by an independent magnetic circuit by inserting delete When current flows in the induction coil 5, the magnetic force lines generated along the inner core are bent in the ring 8 and immediately transferred to the outer cylinder 1, and flow back into the core through the opposite ring 9 to form an independent magnetic circuit. In the case of (6), the lines of magnetic force flow through the rings (9) and (10), and in the case of the induction coil (7), the lines of force flow through the rings (10) and (11). , The ring (8) (9) (10) (11) is installed so that the magnetic force line flows well to the outer cylinder while preventing the contact with the rotating outer cylinder (1) to minimize the gap with the outer cylinder (1) Heating roll with 3-phase induction coil to reduce surface temperature deviation and increase power efficiency