JPS5836839B2 - Heating device using a rotating tube that generates heat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device using a heat-generating rotary cylinder that heats an object to be heated housed inside the cylinder while rotating it, which generates heat by Joule heat based on an electric current generated by electromagnetic induction. , the object is to uniformly heat the object to be heated.

To explain this invention based on the drawings, a cylinder 1 is made of a metal such as a magnetic material such as carbon steel or aluminum, and a sealed annular cylinder is formed inside the peripheral wall 2 (inside the thick part). A chamber 3 is formed along the entire length of the peripheral wall 2.

To form the cylinder 1 having such a chamber 3, an inner cylinder 4 and an outer cylinder 5 are formed, and the outer surface of the inner cylinder 4 or the outer cylinder is formed so that the chamber 3 is formed between the two cylinders 4 and 5. The inner surface of the inner cylinder 5 may be made thinner by leaving the ends intact, and then the inner cylinder 4 may be fitted and fixed to the outer cylinder 5.

Hollow rotating shaft portions 6 at both ends of the cylinder 1 are rotatably supported by bearings and rotated by an appropriate rotational drive source.

A heated body 7 is housed inside the cylinder 1 .

The object to be heated 7 may be a gas, a liquid, or a fluid such as powder or granules.

Conversely, the present invention is suitable for use in heating such fluids.

A heating medium 8 is housed within the chamber 3.

The heating medium 8 is a fluid that is heated and vaporized by the cylinder 1 that generates heat as described later.
Water is used when heating at around 150-250°C, and mineral oil with a boiling point of about 140-200°C is used when heating at around 150-250°C.

The heating medium 8 must not be stored so much that it fills the chamber 3.

During heating, both ends of the cylinder 10 are sealed, but depending on the type of object to be heated, they may be left open, or the object to be heated may be continuously introduced from one rotating shaft 6, and the other end may be closed. The heated object may be continuously discharged from the shaft portion 6.

It is best to keep chamber 3 in a vacuum.
It is effective in lowering the vaporization temperature of

An induction coil 1 is installed on the outer periphery of the cylinder 1 so as to surround the cylinder 1.
0 is installed.

The induction coil 10 is arranged with a gap from the outer periphery, and a yoke 11 serving as a magnetic path is arranged outside the induction coil 10 so as to bridge both ends of the induction coil 100.

Both ends of the yoke 11 face the outer periphery of the circumferential wall of the cylinder 10 with a gap in between.

The yoke 11 may be cylindrical, but it may also be configured with a plurality of bar-shaped yokes 11 as shown in the figure.

The induction coil 10 and the yoke 11 do not rotate like the cylinder 1.

Therefore, these are appropriately fixed, for example, to a fixed frame.

In the above configuration, when the induction coil 10 is energized by an AC power source, the alternating magnetic flux induced by this is generated in the cylinder 1.
That is, it alternately passes through a closed magnetic path consisting of the peripheral walls of the inner cylinder 4 and the outer cylinder 5 along the axial direction, and the yoke 11 bridging these.

Here, the peripheral wall along the circumferential direction of the cylinder 10 acts as a closed circuit interlinked with the alternating magnetic flux directed in the axial direction of the cylinder 10, and thus a secondary short-circuit current is induced in this closed circuit.

This induced current generates Joule heat in the peripheral wall of the cylinder 10, which causes the entire peripheral wall to generate heat.

When the outer cylinder 5 generates heat, the heat medium 8 in the chamber 3 is heated, and when the heat generation temperature becomes equal to or higher than the vaporization temperature of the heat medium 8, the heat medium 8 begins to vaporize and fills the chamber 3. The temperature becomes uniform.

When the vaporized heat medium 8 comes into contact with the surface 4A of the inner cylinder 4, it generates heat of condensation and condenses.

The condensed heat medium 8 travels along the surface 4A and flows back into the liquid phase portion that is still in a liquid phase state.

As described above, the inner cylinder 4 is heated by generating condensation heat at the surface 4A.

However, the temperature in chamber 3 is uniform, and the vaporized heat medium 8
By filling the inner cylinder 4 with water, the inner cylinder 4 is heated uniformly over its entire length by the heat of condensation.

Of course, as described above, the inner cylinder 4 also generates heat based on Joule heat caused by the induced current, and therefore, the inner cylinder 4 receives heat from both.

The object to be heated 7 inside the cylinder 4 is heated by this heat.

Since the cylinder 1, and therefore the inner and outer cylinders 4 and 5, are rotated, the portion of the peripheral wall of the inner cylinder 4 that is in contact with the object to be heated 7 changes continuously.

That is, when this peripheral wall portion comes into contact with the object to be heated 7, the heat of the peripheral wall portion is applied to the object to be heated 7 to heat it.

When the peripheral wall portion separates from the heated body as it rotates, heat is applied by Joule heat and condensation heat due to the induced current, as described above, and its temperature rises.

Then, as the rotation continues, it comes into contact with the object to be heated 7 again and heats it.

This will be repeated below. As described above, since the inner cylinder 4 generates both types of heat uniformly, the object to be heated 7 is heated evenly, and local overheating does not occur.

The above explanation is based on the case where the cylinder 1 is rotating at a relatively low speed, but when it rotates at a high speed, both the heating medium 8 and the heated body 7 are caused by centrifugal force to move around the entire inner surface of the outer cylinder 5. It rotates together with both cylinders 4 and 5 as if attached to the entire circumference of the circumference and the inner surface of the inner cylinder 4.

Even in this case, the heating medium 8 is vaporized and condensed in contact with the inner surface 4A to heat the inner cylinder 4, but the condensed heating medium 8 is blown away by centrifugal force and flows back into the liquid phase portion.

As shown in FIG. 3, the surface 4A of the inner cylinder 4 comes into contact with the vaporized heating medium over its entire circumference.

Therefore, the object to be heated 7 is the inner cylinder 4 to which condensation heat is applied.
Since they come into contact with each other evenly, the object to be heated 7 is evenly heated in this case as well.

As described above, according to the present invention, a cylinder generates heat based on an induced current, a heating medium is stored in a chamber formed in the peripheral wall of the cylinder, and the temperature is uniformly maintained by the heat of condensation during condensation. Since the temperature is increased, the object to be heated housed in the cylinder can be heated uniformly and with high precision by the rotation of the cylinder, and this has the effect of eliminating concerns about localized overheating.

[Brief Description of the Drawings] Fig. 1 is a side sectional view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a longitudinal sectional view of a rotating cylinder. It is. 1...tube, 3...chamber, 7...
Heated object, 8... Heat medium, 9... Induction heating mechanism, 10... Coil, 11... Yoke.

Claims (1)

[Scope of Claims] 1. An induction heating mechanism is provided on the outer periphery of a rotating cylinder that houses a heated object therein to induce a secondary short-circuit current flowing along the circumferential direction in the peripheral wall of the cylinder, and the peripheral wall of the cylinder is Inside,
A heating device using a heat-generating rotary cylinder, which forms an annular sealed chamber along its circumferential direction, and stores a heat medium that is vaporized by the heat generated by the cylinder inside this chamber. 2. The induction heating mechanism includes an induction coil that is arranged to surround a cylinder and is energized by an AC power supply, and an induction heating mechanism that is arranged outside of this induction coil and that is induced when the induction coil is energized. 2. A heating device using a heat-generating rotary tube according to claim 1, which comprises a peripheral wall and a yoke forming a part of a closed magnetic path for alternating magnetic flux passing along the axial direction of the peripheral wall. 3. A heating device using a heat-generating rotary cylinder according to claim 1, wherein the chamber is evacuated.