CN102271428A

CN102271428A - Solid medium heat transfer roller

Info

Publication number: CN102271428A
Application number: CN201010190296XA
Authority: CN
Inventors: 单昶; 丁廷刚; 沈炳荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-03
Filing date: 2010-06-03
Publication date: 2011-12-07

Abstract

The invention discloses a solid medium heat transfer roller, which comprises a roller tube body, a center shaft positioned in the roller tube body, close covers positioned at the two ends of the roller tube body and a plurality of tubular electric heating elements arranged in the roller tube body. The solid medium heat transfer roller is characterized in that: the roller tube body comprises a first roller tube and a second roller tube arranged in the first roller tube; an annular cavity is formed between the first and second roller tubes; and a solid heat conducting medium is arranged in the annular cavity. The solid medium heat transfer roller has the advantages of simple structure, uniform roller body surface temperature, high heat transfer efficiency and substantially no maintenance requirements.

Description

The solid dielectric heat transfer roll

Technical field

The present invention relates to a kind of solid dielectric heat transfer roll, relate in particular to the high solid dielectric heat transfer roll of a kind of heat transfer efficiency.

Background technology

At present, need hot-rolling usually in industrial production such as papermaking, weaving and transfer printing equipments, this hot-rolling plays effects such as pressing to material, stretching, extension, drying, typing, heat transfer in process of production, and its inner hollow is used to load heat transfer medium.Adorn gas or liquid in the existing hot-rolling as heat transfer medium, yet the heat transfer efficiency of gas, liquid is lower.For example, when adopting air as heat transfer medium, the hot-rolling surface is bigger with the inner temperature difference, and its surface is heated inhomogeneous, and when inner air reached 300 ℃-400 ℃ usually, heat was rolled just about 200 ℃ of surface temperatures, and the temperature difference is bigger, and the heat energy utilization rate is lower; And when adopting liquid (as oil) as heat transfer medium, though that the hot-rolling surface is heated is more even, internal-external temperature difference is still bigger, in addition, contain moisture or other impurity in the oil easily, in heating process, easily produce big pressure in the roller body, make the roller body explosion cause accident easily.

Summary of the invention

At the deficiencies in the prior art, the purpose that the present invention solves provides a kind of solid dielectric heat transfer roll, and it can effectively improve heat transfer efficiency.

For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that a kind of solid dielectric heat transfer roll, comprise roller body, be positioned at the central shaft of roller body, the capping that is positioned at the roller body two ends and some electrothermal tubes that is installed on roller body, described roller body comprises first roller, is located at second interior roller of first roller and the annular chamber between described first, second roller, and the solid conductive heat medium is housed in the described annular chamber.

Described electrothermal tube is longitudinal, and the calorific capacity at its two ends is higher than the centre and is nonlinear change.

Described solid conductive heat medium is Powdered nonmetal.

Described solid conductive heat medium is a metal powder.

Described electrothermal tube is located in the described annular chamber, and is equidistantly along the circumferencial direction of described central shaft and arranges.

Be provided with collet between described second roller and the described central shaft.

Described central shaft one end extends described roller body and is connected with a collector ring, and described collector ring is connected with described electrothermal tube.

The invention has the beneficial effects as follows: the roll body surface temperature is even, heat transfer efficiency is high, the electrothermal tube life-span is long.

Description of drawings

Fig. 1 is an expression solid dielectric heat transfer roll longitudinal profile structural representation of the present invention;

Fig. 2 is an expression solid dielectric heat transfer roll horizontal section structural representation of the present invention;

Reference numeral:

1 roller body, 2 annular chambers, 3 electrothermal tubes

6 cappings of 4 collets, 5 central shafts

7 protective covers, 8 collector rings, 11 first rollers

12 second rollers

Embodiment

As Fig. 1 is the longitudinal profile structural representation of solid dielectric heat transfer roll of the present invention, described solid dielectric heat transfer roll comprises roller body 1, is positioned at the central shaft 5 of roller body 1, the capping 6 that is positioned at the roller body two ends and some electrothermal tubes 3 that is installed on roller body 1.

As Fig. 2 is solid dielectric heat transfer roll horizontal section structural representation of the present invention, roller body 1 is that the concentric roller by two different-diameters is nested and forms, described roller body 1 comprises first roller 11, is located at second roller 12 and the annular chamber 2 between described first,

second roller

11,12 in described first roller 11, be provided with electrothermal tube 3 in the annular chamber 2, electrothermal tube 3 is located in the described annular chamber 2 and along the circumferencial direction equal intervals of described central shaft and is arranged, be wound with the heating wire (not shown) of decreasing worm-pitch on the described electrothermal tube 3, in order to play heat effect.Fill full solid heat transfer medium in the described heat transfer roll annular chamber 2.Described central shaft 5 is located in described second roller 12, and overheated in order to prevent described central shaft 5, the outer surface of described central shaft 5 is provided with collet 4.Vertical two ends of described roller body 1 are located in described capping 6, also are provided with protective cover 7 in the outside of described two cappings 6.Described central shaft 5 passes two ends capping 6 and protective cover extends roller body 1, is provided with the collector ring 8 that is connected with described electrothermal tube 3 at an end of central shaft 5, and this collector ring 8 is positioned at the outer end of roller body 1.

In addition, solid dielectric heat transfer roll of the present invention generally is used in papermaking, in industrial production such as weaving and the transfer printing equipment, material is flattened, stretch, dry, typing, heat shifts, but because the heat transfer roll surface radiating is inhomogeneous state, usually the heat dissipation capacity in the middle of the heat dissipation capacity at two ends can be higher than, in order to make the axial and radial surface temperature uniformity of heat transfer roll, make the solid dielectric heat transfer roll can adapt to the feature of hot-rolling surface uneven heat dissipation, heat transfer roll of the present invention has been carried out special setting to electrothermal tube 3, promptly on the electrothermal tube 3 of longitudinal, be wound with the heating wire of decreasing worm-pitch, and the pitch in the middle of the pitch ratio of the heating wire at electrothermal tube 3 two ends is little, so, make the calorific capacity at two ends of electrothermal tube 3 greater than the calorific capacity in centre position, and be nonlinear change, the electrothermal tube 3 of this inhomogeneous heating is necessary in solid dielectric heat transfer roll of the present invention, the rate of finished products in the time of can improving production operation.

Below briefly introduce two specific embodiments of heat transfer roll of the present invention, with the enhancement of explanation the present invention with respect to the technology effect of prior art.

In the present embodiment, the external diameter of described roller body 1 is 420mm, roller is long to be 1800mm, fill the heat conduction copper powder in the heat transfer roll annular chamber 2, electrothermal tube 3 adopts is in the middle of the two ends calorific capacity is higher than and is the heat-generating pipe of nonlinear change, electrothermal tube 3 rises to 250 ℃ to the hot-rolling surface temperature from 20 ℃ of room temperatures, only need 30 minutes, and the error of hot-rolling surface temperature has only ± and 1.5 ℃, described solid dielectric heat transfer roll is applied to digit printing thermal transfer printing machine, owing to adopted the higher copper powder of heat transfer efficiency as heat transfer medium, removed the conduction oil that generally uses in the prior art from, stopped the potential safety hazard of heat conduction water content in oil vaporization explosion.

In another embodiment, the external diameter 500mm of described roller body 1, the long 2500mm of roller, fill conductive powder powder magnesium oxide in the heat transfer roll annular chamber 2, electrothermal tube 3 adopts is in the middle of the two ends calorific capacity is higher than and is the heat-generating pipe of nonlinear change, electrothermal tube 3 rises to 150 ℃ to the hot-rolling surface temperature from 20 ℃ of room temperatures, only need 20 minutes, and the error of hot-rolling surface temperature has only ± and 1.0 ℃, described solid dielectric heat transfer roll is applied to the soft pressing of speciality paper coating machine, has removed the vapour system such as boiler, pipeline, swivel joint, valve of former usefulness from.

Solid dielectric heat transfer roll of the present invention is by filling solid conductive heat medium (as copper powder, Powdered magnesium oxide, non-metal powder etc.) in the annular chamber 2 of inside, make its heat transfer property be better than gas and solid greatly, and the heat that electrothermal tube 3 produces can be delivered to the surface of heat transfer roll soon, and internal-external temperature difference is less, so, electrothermal tube 3 need not hot operation just can make the operation of described heat transfer roll energy ordinary production, not only improve the life-span and the heat transfer efficiency of electrothermal tube 3, also reduced preventive maintenance time and expense.

Although be the example purpose, preferred implementation of the present invention is disclosed, but those of ordinary skill in the art will recognize that under situation about not breaking away from by the disclosed scope and spirit of the present invention of appending claims, various improvement, increase and replacement are possible.

Claims

1. solid dielectric heat transfer roll, comprise roller body, be positioned at the central shaft of roller body, the capping that is positioned at the roller body two ends and some electrothermal tubes that is installed on roller body, it is characterized in that: described roller body comprises first roller, is located at second interior roller of first roller and the annular chamber between described first, second roller, and the solid conductive heat medium is housed in the described annular chamber.

2. according to the heat transfer roll of solid dielectric described in the claim 1, it is characterized in that: described electrothermal tube is longitudinal, and the calorific capacity at its two ends is higher than the centre and is nonlinear change.

3. according to the heat transfer roll of solid dielectric described in the claim 1, it is characterized in that: described solid conductive heat medium is Powdered nonmetal.

4. according to the heat transfer roll of solid dielectric described in the claim 1, it is characterized in that: described solid conductive heat medium is a metal powder.

5. according to the heat transfer roll of solid dielectric described in the claim 1, it is characterized in that: described electrothermal tube is located in the described annular chamber, and is equidistantly along the circumferencial direction of described central shaft and arranges.

6. according to the heat transfer roll of solid dielectric described in the claim 1, it is characterized in that: be provided with collet between described second roller and the described central shaft.

7. according to the heat transfer roll of solid dielectric described in the claim 1, it is characterized in that: described central shaft one end extends described roller body and is connected with a collector ring, and described collector ring is connected with described electrothermal tube.