SU1418374A1 - Method of cooling press roll - Google Patents

Abstract

This invention relates to a method for cooling a press roll and is primarily intended for use in pulp and paper machinery. The purpose of the invention is to intensify the heat exchange of the surface of the shaft jacket. Achieved by the fact that in the method of shaft cooling by supplying jets of coolant to the inner surface of the shaft jacket 1 with the horizontal axis of its rotation, the jet from the 4 nOvioro holes of the cylinder 3 forms upwardly relative to the axis of rotation of the shaft arc ABC, equal to 1/3 of the circumference of the shirt 1 shaft. 2 Il.

Description

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This invention relates to a method for cooling a press roll and is primarily intended for use in pulp and paper machinery.

The purpose of the invention is to intensify the heat exchange of the surface of the shaft jacket.

According to the method of cooling the press shaft by feeding jets of cooling. fluids on the inner surface of the shaft of the shaft with a horizontal axis of rotation of the coolant jet form upward relative to the axis of rotation of the shaft stream with a spray, limited arc, equal to 1/3 the length of the circumference of the shaft jacket.

FIG. 1 shows a press shaft; in fig. 2 is a section A-A in FIG. one.

The cooling liquid from the feeder enters under pressure in the hollow cylinder and the position of the holes so that they cool only the upper part of the inner surface of the metal jacket contributes to its more intensive cooling.

5, since in the upward position the rotating shirt contains the smallest amount of water held by centrifugal forces. Coolant jets bring down a part of such an attached

.Qyo, which intensifies the process of cooling the shaft. Intensification of the cooling process increases the reliability of the elastic layer, the entire pressing shaft and allows you to switch to higher pressing conditions, i.e. boost speed and linear

15 pressure, which is equivalent to increasing the productivity and efficiency of the machine.

Active heat transfer from internal to

lindr 3 and through openings 4 is fed to the top-JQ of the surface of the metal shaft of the shaft wasp

The new part of the inner surface of the metal jacket 1 is a directional flow with a spray flame limited by an arc equal to 1/3 of the length of the circumference of the shaft of the shaft. If the cooling liquid absorbs heat generated by cyclic deformation of the elastic layer 2 into the internal cavity of the metal jacket 1, evenly and simultaneously along the entire length of the metal jacket, it flows into the lower part of the metal jacket 1 and through the tube 5 is removed from the press shaft.

According to the proposed method, due to uniform cooling of the inner surface of the metal jacket, there is no temperature difference along the length of the metal jacket and the elastic layer. When the temperature of the elastic layer is constant along the length of the shaft, the constancy of the physical and mechanical properties of the material of the elastic layer (hardness, strength, adhesive strength, deformability, etc.) is ensured, which ensures the constancy of the contact area along the shaft length, the constancy of the process dewatering and, therefore, the constancy of the properties of the paper web at the exit of the press.

it exists at 1/3 of the circumference in its upper part, since for 2/3 of the circumference it is covered with a layer of attached water and water flowing under the force of gravity (Fig. 1), which makes heat exchange difficult for ABC is decisive in the overall heat balance. By increasing the heat sink, it is possible to achieve heat transfer by ABC by improving the cooling of this part by: -. surfaces directed by streams of fluid, for example, with a higher rate of fluid flow.

35

Claims (1)

Invention Formula The method of cooling the press roll of a predominantly papermaking machine by supplying jets of cooling fluid to the inner surface of the shaft work roll with a horizontal axis of rotation, characterized in that, in order to intensify heat exchange, the coolant streams are formed upwards relative to the axis of rotation. The shaft has a stream with a spray, limited by an arc, equal to 1/3 of the length of the shaft's 45 shirts. 40 The arrangement of the holes so that they cool only the upper part of the inner surface of the metal jacket contributes to its more intensive cooling, since in the upper position the rotating shirt contains the least amount of water held by centrifugal forces. Coolant jets bring some of this water down to such an extent that it intensifies the shaft cooling process. Intensification of the cooling process increases the reliability of the elastic layer, the entire pressing shaft and allows you to switch to higher pressing conditions, i.e. boost speed and linear 5 pressure, which is equivalent to increasing the productivity and efficiency of the machine. Heat transfer is active from the inner surface of the metal jacket of the shaft wasp it exists at 1/3 of the circumference in its upper part, since for 2/3 of the circumference it is covered with a layer of attached water and water flowing under the force of gravity (Fig. 1), which makes heat exchange difficult. ABC heat transfer is decisive in the overall heat balance. Increased heat removal can be achieved by intensifying heat transfer through ABC by improving the cooling of this part of the surface with directional jets of liquid, for example, with a higher flow rate of liquid. 35 Invention Formula The method of cooling the press shaft, mainly the papermaking machine, by supplying jets of coolant to the inner surface of the shaft work roll with a horizontal axis of rotation, characterized in that, in order to intensify heat exchange, the coolant streams are formed upwards relative to the axis of rotation. a shaft with a spray torch bounded by an arc equal to 1/3 of the length of the shaft shaft circumference. 40