JPS591840B2 - Hot air supply device to dryer pocket in paper machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supplying hot air to a dryer pocket in a paper machine, which is installed in a dryer section of a paper machine and is used to ventilate moisture accumulated in pockets in the dryer. .

To explain the dryer section of the paper machine with reference to FIG. 1, 1 is a roll-shaped dryer, 2 is a canvas that is divided into two groups and handed over to the dryer 1, and 3 is a section between all dryers 1 and canvases 2. 4 is a dryer pocket.

Hot air is supplied to each dryer pocket 4 via a hot air supply roll 5 and a canvas 2 to assist in drying the wet paper 3 and to adjust the moisture profile of the wet paper 3 in the width direction.

In the conventional hot air supply roll 5, as shown in FIG. Bearing 7
The structure is complicated, and there are disadvantages in that there are many accidents such as oil leakage from the labyrinth 8 and damage to the bearing 7 itself.

The present invention simplifies the structure of the hot air supply roll by preventing a duct from passing through the bearing that supports the hot air roll, thereby preventing the above-mentioned accident from occurring.
A hollow perforated roll that contacts the canvas of a paper machine, a partition plate that divides the inside of the roll into a plurality of chambers lined up in the longitudinal direction of the roll, and a partition plate that partitions the inside of the roll into a plurality of chambers arranged in the longitudinal direction of the roll, and a hot air supply header facing the perforated roll; a partition plate that partitions the inside of the hot air supply heg 21 into a plurality of chambers facing the plurality of chambers of the perforated roll; and a partition plate provided in each chamber of the hot air supply header. A paper machine comprising: a perforated plate parallel to the axis of the roll; a plurality of hot air supply ducts each communicating with the chambers of the hot air supply header; and a damper provided for each hot air supply duct. The gist is a device for supplying hot air to a dryer pocket in a machine.

Next, an embodiment of the present invention will be explained with reference to FIGS. 3 and 4. 11 is a roll (
The roll is a perforated roll (hereinafter referred to as a perforated roll), is hollow inside, and has a large number of holes 12 in its cylindrical surface.

An internal roll partition plate 13 is provided inside the perforated roll 11, and divides the inside of the perforated roll 11 into a plurality of chambers 14 arranged in the longitudinal direction.

Both longitudinal ends of the perforated roll 11 are closed and rotatably supported by a bearing 16 via a solid shaft 15.

17 is a housing of the bearing 16, and 18 is a bearing retainer.

The canvas 2 is in contact with one side (the upper side in FIG. 4) of the perforated roll 110 cylinder.

On the side opposite to the side where the perforated roll 11 contacts the canvas 2 (lower side in FIGS. 3 and 4), there is a perforated roll 1
A hot air supply header 19 is supported by a bracket 20 so as to face the hot air supply header 19 .

A labyrinth seal 21 or a contact type seal is provided between the hot air supply header 19 and the perforated roll 11, as shown in an enlarged view in FIG.

Inside the hot air supply header 19, there is a roll internal partition plate 13.
A partition plate 22 is provided so as to be located on the same plane as the hot air supply header 19, and divides the inside of the hot air supply header 19 into a plurality of chambers 23 arranged in the longitudinal direction of the perforated roll 11.

A hot air supply duct 24 is connected to each chamber 23, and a damper 25 provided in each hot air supply duct 24 sends hot air while adjusting the supply amount to each chamber 23. .

A perforated plate 26 is installed inside the chamber 23 facing the perforated roll 11, so that the pressure distribution of the hot air within each chamber 23 is made equal.

As shown in FIG. 6, a cylindrical reinforcing shell 27 is provided concentrically inside the perforated roll 11.
It is also possible to increase the strength of the perforated roll 110 by connecting the perforated rib 28 to the reinforcing shell 27.

In the hot air supply device described above, when the amount of hot air adjusted by the damper 25 is sent to each hot air supply duct 24, this hot air passes through the perforated plate 26 in the chamber 23 and is distributed to each chamber 23. The pressure is evenly distributed, and the perforated roll 11
The air passes through the canvas 2 (see FIG. 4) and blows out toward the dryer pocket 4 (see FIG. 1).

Since this hot air path does not pass through the inside of the bearing as in the conventional case, the structure of the bearing portion is simplified, which has the effect of preventing oil leakage and damage to the bearing.

In addition, the inside of the perforated roll and the inside of the hot air supply header are divided into a plurality of chambers lined up in the longitudinal direction of the perforated roll, and the amount of hot air can be adjusted for each chamber using a damper. Since the pressure distribution in each chamber is made uniform, the amount of hot air blown in the width direction of the canvas can be easily and reliably adjusted.

[Brief explanation of drawings]

FIG. 1 is a side view showing the dryer section of a paper machine, FIG. 2 is a partial sectional view of a conventional hot air supply roll, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. Figure IV-I
5 is an enlarged sectional view showing a labyrinth seal portion between the perforated roll and the hot air supply header, and FIG. 6 is a sectional view of another embodiment of the perforated roll. 2...Canvas, 4...Dryer pocket, 11...Perforated roll, 19...
・Hot air supply header, 22... Partition plate, 23.
...Room, 24...Hot air supply duct, 25
······damper.

Claims (1)

[Claims] 1. A hollow perforated roll in contact with the paper machine canvas,
a partition plate that divides the inside of the roll into a plurality of chambers arranged in the longitudinal direction of the roll; a hot air supply header that faces the perforated roll from a side opposite to the side of the perforated roll that contacts the canvas; and a hot air supply header that faces the perforated roll from the side opposite to the side that contacts the canvas; a partition plate that divides the inside of the header into a plurality of chambers facing the plurality of chambers of the perforated roll; a perforated plate provided in each chamber of the hot air supply header and parallel to the axis of the perforated roll; 1. A hot air supply device to a dryer pocket in a paper machine, comprising a plurality of hot air supply ducts each communicating with a chamber of a hot air supply header, and a damper provided for each hot air supply duct.