JPS6324383Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a rotating heating roller device.

As is well known, a rotating heating roller device stores a heat source such as an induction coil, a resistor, or a heat generating heater inside a rotatable roller body, and uses this heat source to generate heat in the roller body. It consists of In order to make the temperature of the surface of the roller body uniform at this time, a jacket chamber is provided in the peripheral wall of the roller body, and a jacket chamber is vacuum-sealed with a gas-liquid two-phase heating medium.

1 and 2 show the configuration of a conventional example, where 1 is a roller body, 2 is a rotating shaft, 3 is a bearing, 4 is a heat source housed inside the roller body 1, and in the example shown in the figure, the shaft 5 Supported by The shaft 5 is supported within the rotating shaft 2 by a bearing 6. 7 indicates a lead for energization. A jacket chamber 8 is provided on the peripheral wall of the roller body 1.
is configured. As shown in FIG. 2, this jacket chamber 8 is configured as an annular chamber along the circumferential direction of the roller body 1, and a gas-liquid two-phase heat medium 9 such as water or other gas is vacuum sealed inside. The heat medium 9 evaporates in the jacket chamber 8 in a high temperature range, taking away latent heat of vaporization, and condenses in a low temperature range, giving latent heat of condensation. Through this circulation of evaporation and condensation, the surface temperature of the roller body 1 is made uniform.

By the way, according to such a configuration, when the roller main body 1 is rotating at a low speed, as shown in the figure,
Most of the liquid heat medium 9 is accumulated under the roller body 1 due to its gravity, and the liquid heat medium 9 is in contact with both the inner wall 8A and the outer wall 8B of the jacket chamber 8. Therefore, the liquid phase heat medium 9 is efficiently evaporated by the heat from the heat generation source 4, and the surface temperature of the roller body 1 is made uniform due to the latent heat transported by the heat medium vapor.

However, when the roller main body 1 is rotating at high speed, the liquid phase heating medium 9 becomes stuck to the outer wall 8B of the jacket chamber 8 due to centrifugal force, and a uniform liquid film is formed on the outer wall 8B. Therefore, latent heat is no longer transported by the heat medium vapor. A configuration in which the inner wall 8A of the jacket chamber 8 is wrapped with a porous material 10 is also known. When the roller main body 1 is rotating at a low speed, due to the capillary phenomenon of the porous material 10, a large amount of liquid heat medium also exists on the inner wall 8A that is not in contact with the liquid heat medium 9, which is not convenient. good. During high-speed rotation, even if the porous material 10 contains a liquid heat medium at the beginning, once this evaporates, it will not be replenished, so for the same reason as above, the surface temperature will decrease. Uniformity will not be achieved.

The jacket chamber 8 shown in FIGS. 1 and 2 is configured as an annular chamber along the circumferential direction of the roller body 1, but instead of this, as shown in FIG. A plurality of narrow-diameter jacket chambers 11 parallel to each other are arranged in the circumferential direction of the roller body 1, and both ends of each jacket chamber 11 are communicated with each other by an annular groove extending in the circumferential direction of the roller body 1. It is also known that the configuration is

According to this configuration, when the roller body 1 is rotating at high speed, the liquid phase heating medium 9 is stuck to the outside as seen from the center of rotation of the roller body 1 due to centrifugal force, as shown in FIG. becomes. At this time, the heat on the inner surface of the roller body 1 is conducted toward the surface, but even if some of it reaches the surface, the other part is heated by the liquid heat medium in the jacket chamber 11. is consumed, thereby causing the liquid heat transfer medium to evaporate. This steam creates a flow in the axial direction within the jacket chamber 11 to equalize the temperature in the axial direction of the roller body 1, and also equalizes the temperature in the circumferential direction of the roller body 1 by flowing through the annular groove.

However, when the roller body 1 rotates at low speed, the fourth
As shown in the figure, the liquid phase heat medium accumulates in the lower jacket chamber 11 due to gravity, and the liquid phase heat medium in the upper jacket chamber 11 returns to the lower jacket chamber 11 through the annular groove. I get tired.
As a result, only a thin liquid film of the liquid heat medium is formed on the wall surface of the upper jacket chamber 11, and after this liquid film evaporates, it becomes dry.
Not only is it impossible to generate the steam necessary for temperature equalization, but the roller body becomes overheated, and the roller body is no longer able to achieve any temperature uniformity in the axial and circumferential directions.

The purpose of this invention is to improve the structure of the jacket chamber, which is effective in equalizing the temperature during high-speed rotation, and to make it effective in equalizing the temperature even during low-speed rotation.

An embodiment of this invention will be explained with reference to FIG. 5 and subsequent figures. Note that parts given the same reference numerals as in FIGS. 1 to 4 indicate the same or corresponding parts. The embodiment shown in FIG. 5 has a plurality of jacket chambers 11 extending in the axial direction of the roller body 1, similar to the structure shown in FIG.
are arranged in the circumferential direction of the roller body 1, and the ends of each jacket chamber 11 are communicated through an annular groove 12. According to this invention, the communicating part 13 that communicates the end of the jacket chamber 11 with the annular groove 12 is made smaller in diameter than the jacket chamber 11 to form a stepped part 14.
The wall surface on the axis side of the roller body 1 is positioned closer to the axis side of the roller body 1 than the step surface of the stepped portion 14 of the communication portion 13, so that the wall surface on the axis side of the roller body 1 in the jacket chamber The stepped portion 14 becomes higher than the above.

In the above configuration, when the roller body 1 rotates at high speed, the liquid phase heating medium sticks to the outside of the jacket chamber 11, similar to the state shown in FIG. fulfill
On the other hand, during low speed rotation, most of the liquid heat medium accumulates in the lower jacket chamber 11 and annular groove 12 due to gravity. As the roller body 1 rotates, when the water level rises above the liquid phase level,
The liquid heat medium in the jacket chamber 11 is transferred to the communication section 13.
The liquid heat medium flows down through the annular groove 12 and into the jacket chamber 11, but due to the presence of the step 14, a part of the liquid heat medium remains in the jacket chamber 11 as shown in FIG. The roller main body 1 continues to rotate while remaining suspended. Therefore, even if the roller main body 1 is rotating at a low speed, it will not become dry even by heating for a time corresponding to the amount of remaining liquid heat medium, and will continue to generate steam. This achieves the required temperature equalization effect.

Generally, the temperature of this type of roller body is high at the center, and tends to decrease toward the ends.
In order to achieve uniform surface temperature even in a roller body having such a tendency, it is preferable to form the communication portion 13 long along the axial direction as shown in FIG. 7.
In this way, if the peripheral wall of the communication part 13 is made to be the main condensation area for the vapor of the heat medium, and the high temperature part in the center is made to be the main evaporation area for the residual liquid heat medium in the jacket chamber, the temperature isotherm effect can be improved. It will continue to improve.

As described in detail above, according to this invention, when a plurality of jacket chambers are formed in the peripheral wall of the roller body and communicated with each other through annular grooves, even when the roller body is in both high and low rotation states, the enclosed heat medium can be heated. This has the effect of reliably achieving a temperature equalization effect through liquid circulation.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional example, Figure 2 is a cross-sectional view of the same, Figures 3 and 4 are cross-sectional views of other conventional examples, and Figure 5 is a vertical cross-section showing an embodiment of this invention. FIG. 6 is a cross-sectional view of the same, and FIG. 7 is a longitudinal cross-sectional view showing another embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Roller body, 4... Heat generation source, 9... Heat medium, 11... Jacket chamber, 12... Annular groove, 1
3...Communication section, 14...Stepped section.

Claims (1)

[Scope of utility model registration request] A plurality of jacket chambers along the axial direction of the roller body are arranged in a circumferential direction of the roller body on the peripheral wall of the roller body, which has a heat generation source inside, and the ends of the jacket chambers are arranged in the circumferential direction of the roller body. In a rotating heating roller device that communicates with an annular groove extending in the circumferential direction and in which a gas-liquid two-phase heating medium is sealed in the jacket chamber, an end portion of the jacket chamber and the annular groove are connected to each other in the jacket chamber. , a rotary heating roller device which communicates with each other through a communication portion having a stepped portion higher than the wall surface on the axis side of the roller main body.