SU1672178A1 - Seal of rotating furnace - Google Patents

Abstract

The invention relates to a sealing technique for rotating drums operating under vacuum and can be used in the building materials industry. The purpose of the invention is to increase compaction efficiency and reliability of operation. For this, the seal comprises a composite sealing ring made of alternating blocks 5 of antifriction material and wedge blocks of wear-resistant material clamped with springs between the shells 1 and 2 of the fixed chamber 3. While the wedge blocks 6 are made with grooves 9, which include a closed flexible element 7, covering blocks 5 and connected with blocks 6 clamps 10. 1 Cp. f-ly, 2 ill.

Description

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FIG. one

This invention relates to a compaction technique for rotating drums operating under vacuum, and can be used in the building materials industry.

The aim of the invention is to increase the efficiency of compaction and reliability of operation.

Figure 1 shows the seal, a longitudinal section; FIG. 2 is a section A-A in FIG. 1. FIG.

The rotary kiln seal contains a composite seal installed between the shells 1, 2 of the fixed chamber 3 and the furnace housing 1, a ring of alternating blocks of antifriction material (for example, graphite or cast iron) with parallel ends and wedge blocks 6 of wear-resistant material. The mechanism of pressing the blocks to the furnace body 4 is made in the form of a closed spring-loaded flexible element 7 (for example, a cable) enclosing the blocks of antifriction material with springs 8 that ensure contact of the blocks 5, 6 with the furnace and between themselves. The wedge blocks are made with grooves 9 on the outer surface, in which a closed flexible element 7 is located, which is connected to the blocks by springs 10.

To secure the flexible element 7 relative to the blocks 5, pins 11 are fixed on it, which enter the grooves 9 on the blocks 5. On the blocks 6 there are guides 12 with axes 13 on which the springs 10 are put on, another end is fixed to the flexible element 7. Composite a sealing ring of blocks 5, 6 is pressed against the ring 2 by means of a shell 1 through springs 14, which are put on the fingers 15, fixed at one end in the shell 2, and having nuts on the other.

Thus, one of the shells of the fixed chamber — the shell 2 — is attached to the shell 1 movably with possibility of movement in the axial direction and spring-loaded. The size of the gap between the furnace body and the fixed chamber 3 with the shell is chosen from the condition of excluding their contact with any beat of the furnace body. The size of the blocks 5 along the radius is chosen 2-4 times larger than the gap between the furnace and the chamber. The dimensions of the blocks 5 around the circumference between the parallel edges are taken constructively, taking into account obtaining the minimum allowable gap between the block 5 and the furnace body 5 if the latter is ovular (the larger the block size and the greater the oven ovality, the greater the gap that occurs). The thickness of the blocks 5 is chosen constructively. The size of blocks 6 around the circumference at the place of their contact with the furnace is selected not more than 10 cm and is specified from the condition of obtaining in

the sum, together with blocks 5, of a circle equal to the circumference of furnace 1. The angle of the wedge of blocks 6 is chosen to be 360 ° / n, where the n-number of blocks is 5 or 6 (their number is the same). The thickness of the blocks 6 is equal to the thickness of the blocks 5.

0 The size of blocks 6 along the radius is chosen smaller than the sizes of blocks 5 by the amount of permissible wear of the latter. The location of the axes 13 relative to the blocks 6 is determined from the condition of the location

5 springs 10 between axles 13 and cable 7, which always ensure that blocks 6 are pressed against the furnace.

The dimensions and characteristics of the springs 8 are determined by the calculation of the constant pressing of the blocks 5 to the furnace, taking into account the permissible amount of wear of the blocks 5 from the friction of the furnace. The outer dimensions of the shells 1, 2 are selected from the condition of the block 6 between them taking into account their radial movements and fingers 15. The dimensions and characteristics of the springs 14 are determined by calculation from the condition that the blocks 5, 6 are clamped between the shells 1, 2, the other dimensions are determined constructively

0 and tested for strength and operability.

The compaction of the rotary kiln operates as follows.

Composite O-Ring

5 blocks 5, 6 all the time in contact with the furnace. since the blocks 5 are pressed to it by means of a flexible element with springs 8, and the blocks 6 by springs 10 - through the axes 13. The blocks 5, 6 are clamped between the shells 1,

0 2, When the furnace rotates and there is a beating of its axis, the blocks 5, 6 all the time move in the radial direction by the amount of this beating, but all the time they are in contact with it and the shells 2, which ensures

5 seal, including when the block 5 is worn out within acceptable limits.

The proposed seal design provides increased reliability due to the absence of guides, which reduces manufacturing costs and maintenance costs, and the absence of a gap between blocks 5, 6 and shells 1, 2 eliminates cold air leaks, which reduces fuel consumption.

Claims (2)

1. Sealing a rotary kiln containing a composite sealing ring installed between the shell of the fixed chamber and a furnace enclosing the furnace body of alternating blocks of antifriction material with parallel ends and wedge blocks of wear-resistant material and a mechanism pressing the blocks to the furnace body with springs characterized in that in order to increase compaction efficiency and reliability of operation, wedge blocks are made with grooves on the outer surface, and the block pressure mechanism is in the form of 12 o / blocks of antifriction material of a closed spring-loaded flexible element located in the grooves of the wedge blocks and connected to them by springs. 2. A seal according to claim 1, characterized in that one of the shells of the fixed chamber is attached to the other movably with the possibility of movement in the axial direction and is spring-loaded. Aa 7 / /five eight FIG. 2