RU1781524C - Device for sealing space between rotating drum and fixed chamber - Google Patents

Abstract

Usage: in chemical engineering in devices with rotating drums used in the chemical, petrochemical, cement and other industries. SUMMARY OF THE INVENTION A number of annular partitions are mounted on a fixed chamber and on a furnace body. The partitions of the fixed chamber are corrugated with protrusions along the perimeter on one side and annular grooves on the opposite side. The movable devices, in the form of rollers fixed to the walls of the rotating shell, are in contact with the protrusions of the walls of the fixed chamber. The protrusions of adjacent partitions are offset and partially overlap each other. 2 ill.

Description

The invention relates to chemical engineering, in particular to rotary drum furnaces used for heat treatment of bulk materials, and can be used to seal the gaps between the rotary drum of the furnace and stationary chambers.

Devices are known for sealing the gap between a rotating drum and a stationary chamber, in which the annular gap is sealed by overlapping it with rigid or elastic parts, the principle of which is based on the formation of friction pairs.

A disadvantage of the known devices is wear of rubbing pairs, design complexity and increased metal consumption, especially for large diameter furnaces, which reduces the tightness of the seals.

The closest technical solution to the invention in terms of technical essence and the achieved result is a device for sealing the gap between the rotating drum and the stationary chamber, containing rotating partitions and stationary partitions pressed against them.

The disadvantages of the prototype are:

the occurrence of friction sliding upon contact of moving and stationary parts, leading to wear of a friction pair;

insufficient tightness of contact points of contacting flat sections;

high metal consumption of the device due to the presence of a large number of metal parts.

The purpose of the invention is to increase the tightness, reduce metal consumption

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This goal is achieved by the fact that in the device for sealing the gap between the rotary kiln and the stationary chamber, comprising a stationary shell secured to the latter, a rotational shell secured to the rotary kiln body, ring partitions mounted on the shells, and clamping devices, fixed chamber partitions are corrugated with protrusions around the perimeter on one side and Koltbtsovym grooves on the opposite side, while the protrusions of adjacent corrugated partitions are offset relative to each other specifically, a friend with a partial overlap in the plane of the cross section and facing the pressure devices made in the form of rollers fixed to the walls of the rotating shell.

In FIG. 1 shows a device for sealing the gap between a rotating drum and a stationary chamber, a longitudinal section; in FIG. 2 is a section AA in FIG. 1,

The device comprises a fixed shell 3 and a rotating shell 4 fixed on a stationary chamber 1 and a rotating drum 2.

A number of partitions 5 made of corrugated flexible material are rigidly attached to the inner surface of the stationary shell 3, and a number of partitions 6 are rigidly fixed to the outer surface of the rotating shell 4.

Partitions 5 and 6 are made circular and installed with a gap with respect to the shells 4 and 3, respectively, alternating between each other in the axial direction.

On one of the side surfaces of the partitions 5 (depending on the type of execution - right or left) from the side of the rotating shell 4, it is arranged evenly around the circumference of a number of protrusions 7. The properties of the material of the protrusions should provide a constant length of the protrusions and the distances between them, and to compensate for the shift of the rotating partitions 6, for which the protrusions 7 can be made hollow or from a material having bulk elasticity.

The time of one contact corresponds to a certain rotation angle of the rotating drum, which can be determined by the formula - p arccos {Kp2 + 1 - (1 +

+ Ј) 2.Kg2 (KR-1) (2Kr)},

where Kp is a coefficient numerically equal to the ratio of the radius of the stationary shell 3 to the radius of the rotating shell 4;

Kg is a coefficient numerically equal to the ratio of the width of the ring of the partition 5 of elastic material with straightened corrugations to the width of this ring in a free state;

the e-relative longitudinal deformation of the elastic material is equal to the relative increment of the length of the flat stretched material to its length before stretching;

p is the Central angle of rotation of the drum 2 for one contact of the partitions 5 and 6, deg. On the opposite side of the protrusions 7 of the partition 5, annular grooves 8 are placed, which make it possible to improve the contact of the interacting surfaces of the partitions 5 and 6. On the lateral surfaces of the rotating annular partitions 6 facing the protrusions 7, there are clamping devices made in the form of a series of rollers 9, mounted on the brackets 10 radially and evenly around the circumference so that the number of rollers is equal to the protrusions. The rollers are equipped with flanges 11 to prevent the shift of the pressed annular corrugated partition 5

relative to the annular rotating partition 6.

During rotation of the drum 2 with a rotating shell 4, each of the pairs of partitions 5 and 6 alternately covers the gap

between the stationary and rotating shells 3 and 4, thereby ensuring the tightness of the seal over time.

The duration of contact of one pair of partitions 5 and 6 is determined by the frequency

rotation of the drum with the length of an individual protrusion 7, the number of pairs of partitions 5 and 6, the width of the ring of the partition 5, the number of corrugations and the elastic properties of the elastic material from which the partitions 5 are made.

The minimum number of pairs of partitions is equal to two; an increase in the number of pairs of partitions helps to increase the tightness of the device for sealing and to reduce the frequency of contacts of pairs.

Between the rotating and stationary shells 4 and 3, on the side of the stationary chamber 1, a cooling chamber 12 is located, provided with inlets and outlets of the heat carrier 13 and 14, protecting the partition 5 from radiation from the side of the stationary chamber 1.

A device for sealing the gap between the rotating drum and the stationary chamber operates as follows.

When the drum rotates, a series of rollers 9 placed on one of the rotating annular partitions 6 creeps onto a number of protrusions placed on the corresponding corrugated annular partition and presses it against the other partition 6.

When the rollers 9 roll over the protrusions 7, the annular partition 5, being rigidly connected to the stationary shell 3 on one side and pressed against the rotating partition 6 on the other hand, undergoes twisting, leading to stretching of the corrugated elastic material of the partition 5 along the chords rings.

After the rollers 9 come off the protrusions 7, the partition 5 returns to its original position due to the elastic forces of the elastic material of the partition 5, and this leads to a violation of the tightness of this pair of partitions 5 and 6.

Since the protrusions 7 of the adjacent partitions 5 are offset and partially overlapping each other in the plane of the cross-section, then before the rollers 9 exit from the protrusions 7 of one partition b, a number of rollers 9 creep in another rotating partition 6 onto the corresponding protrusions 7 of the other corrugated partition 5 and its pressure against the corresponding partition 6. what ensures

Seals a constant overlap of the gap between the stationary 3 and the rotating 4 rims.

To protect the partitions 5 from overheating, especially when operating under excessive pressure in the furnace, cold coolant is supplied to the cooling chamber 12 through the nozzle 13.

Claims (1)

SUMMARY OF THE INVENTION A device for sealing the gap between a rotating drum and a fixed chamber, comprising a fixed shell, a rotary shell, mounted on a rotary kiln body, annular partitions mounted on the shells, pressing devices, characterized in that, in order to increase the tightness, reduce metal, the walls of the fixed chamber are corrugated with protrusions around the perimeter on one side and annular grooves on the opposite side, when In this volume, the protrusions of the adjacent corrugated partitions are offset relative to each other with a partial overlap in the plane of the cross section and face towards the clamping devices made in the form of rollers fixed to the walls of the rotating shell. FIG. / I g 1 (rig. 2