JPH0141190Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to an induction heating roller device.

(Prior Art) In this type of induction heating roller device, in order to make the temperature of the roller peripheral wall uniform, instead of providing a jacket chamber in which a gas-liquid two-phase heating medium is sealed inside the peripheral wall of the roller, a jacket chamber is installed inside the peripheral wall. It is already known that a heat pipe is inserted and fixed in the. In order to install this heat pipe, a round hole is made in the peripheral wall of the roller along the axial direction of the roller, and the heat pipe is inserted into this round hole.

However, if the roller is long, for example over 1 m, the straightness, which is the processing accuracy of the round hole, will decrease and the round hole will become more curved along its axial direction. Therefore, the bending of the heat pipe inserted into the round hole becomes large, and it becomes difficult to insert the heat pipe through the round hole.

To solve this problem, the clearance for the heat pipe can be increased and a round hole can be machined. However, when processed in this way, a space is formed between the heat pipe and the inner surface of the round hole. If such a space exists, the space will act as a heat insulating layer, and the heat uniformity effect of the heat pipe will be inhibited.

In order to prevent such a decrease in the straightness of the round hole,
It is conceivable to machine round holes from both ends of the roller, but make sure that the holes drilled from one end and the holes drilled from the other end match perfectly without any misalignment. Machining each hole is extremely difficult.

(Problem that the invention aims to solve) This invention minimizes the presence of a heat insulating layer by minimizing the clearance between the two when inserting the heat pipe into the round hole. Therefore, the purpose is to ensure the temperature uniformity effect by the heat pipe.

(Means for solving the problem) This invention has a round hole provided in the peripheral wall of the roller.
Long and short heat pipes are inserted, and the abutting part of the heat pipe inserted into one of the adjacent round holes and the abutting part of the heat pipe inserted into the other are aligned in the axial direction of the roller. It is characterized by being arranged in a staggered manner along the .

(Example) An example of this invention will be explained with the help of diagrams: 1
is a roller, to which is connected a shaft 2, which is rotatably supported by a bearing 4 installed on a fixed platen 3 made of a magnetic material. This stationary platen 3 is placed opposite to the opening surface of the roller 1 so as to cover it.

A magnetic flux generating mechanism 7 is constituted by the induction coil 5 and the iron core 6, and this is arranged inside the roller 1 coaxially with the roller 1. Both the induction coil 5 and the iron core 6 are supported by the fixed platen 3. When the induction coil 5 is excited by an AC power source, a current is induced in the peripheral wall 1A of the roller 1, and the peripheral wall 1A generates heat due to this current.

8 is a round hole formed in the peripheral wall 1A so as to extend along the axial direction of the roller 1;
A plurality of rollers are installed in line in the circumferential direction of the roller 1 (see FIG. 2). And for each round hole 8,
A gas-liquid two-phase heating medium is sealed inside. Heat pipes 9 with multiple lengths (two in the example)
A and 9B are inserted. In the illustrated example, the length ratio of the heat pipes is 1:2.

Furthermore, the abutting portion 10 of both heat pipes inserted into one round hole 8 is different from the abutting portion 10 of both heat pipes inserted into another round hole 8 next to it. The abutting portions 10 are arranged so as to be offset from each other along the center direction, that is, so that the abutting portions 10 are positioned in a staggered manner (see FIG. 3).

In the above configuration, when the roller 1 generates heat by the magnetic flux heating mechanism 7, each heat pipe 9A,
Based on the phase change of the heat medium in 9B, the temperature of the peripheral wall 1A portion facing each heat pipe 9A, 9B is equalized, and the portion facing the same heat pipe has a uniform temperature distribution.

Here, the part facing the heat pipe 9A and the part facing the heat pipe 9B, which are inserted into the same round hole, come into contact with loads of different temperatures, and this load causes the surface temperature between the two parts of the roller to rise. Suppose that there is a difference between If only one heat pipe is inserted into the round hole, it is easy to understand that the surface temperature will be made uniform by that heat pipe.

However, when two heat pipes are inserted as shown in the figure, even though direct heat conduction does not occur between both heat pipes, there is heat transfer between both heat pipes via the peripheral wall 1A of roller 1. heat is conducted. Therefore, due to this heat conduction, the temperature of the portions facing both heat pipes is equalized, and thereby the temperature of the entire peripheral wall 1A is equalized.

In this case, a heat insulating effect occurs at the abutting portions 10 of the heat pipes 9A and 9B, but since the abutting portions 10 are arranged in a staggered manner as shown in the figure,
Indirect heat conduction is possible through the roller peripheral wall as described above. If these were not arranged in a staggered manner, all of the abutted parts would be lined up in the circumferential direction of the roller, so the parts facing the heat pipes 9A and 9B would be insulated from each other due to the heat insulation effect at these abutted parts. Therefore, the temperature isotherm effect as described above does not occur.

Because the roller 1 is long, when the round hole 8 is also formed long, even if its straightness is reduced, a heat pipe with a shorter length than the round hole is inserted, so the heat pipe is not as long as the round hole. does not bend.
In addition, even if a difference in level occurs because the abutting portions 10 of the holes do not match, as in the case where one round hole 8 is drilled from both sides of the roller 1, each heat pipe is inserted from each end side of the roller. if,
Each heat pipe can be inserted without any hindrance.

In any case, the heat pipe can be inserted without having to make the diameter of the round hole larger than necessary, so the clearance between the round hole and the heat pipe can be small enough, so that it can be formed there. The insulation effect of the space layer can be very small.

(Effects of the invention) As detailed above, according to this invention, when installing the heat pipe inside the peripheral wall of the roller,
Even if the straightness of the hole for insertion is reduced, the heat pipe can be inserted with a sufficiently small clearance.Therefore, the heat insulation effect due to the clearance can be suppressed as much as possible, and the heat pipe can be inserted into one hole. Even if a heat insulating effect occurs at the abutting portions due to the insertion of a plurality of heat pipes, the effect is that the inhibition of the temperature uniformity effect due to this can be reliably avoided.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is a partial cross-sectional view of the roller, and FIG. 3 is a partial exploded cross-sectional view of the roller. DESCRIPTION OF SYMBOLS 1... Roller, 1A... Peripheral wall, 7... Magnetic flux generation mechanism, 8... Hole (round hole), 9A, 9B... Heat pipe, 10... Butt portion.

Claims (1)

[Scope of utility model registration request] A plurality of holes extending in the axial direction of the roller are provided in the peripheral wall of the roller, which is equipped with a magnetic flux generating mechanism for induction heating inside, and a gas-liquid two-phase heat medium is sealed inside each hole. An induction heating roller device in which a plurality of long and short heat pipes are inserted, and abutting portions of the heat pipes inserted into adjacent holes are positioned in a staggered manner along the axial direction of the roller.