Sealing device for rotating furnace

FIELD: construction.

SUBSTANCE: device comprises flexible casing whose one edge is secured to the unmovable chamber and the other edge is connected with the sealing ring. The edge of the sealing ring that faces the drum is made of two members that embrace the other contact ring from two sides. The contact ring is secured to the rotating drum. The device is provided with rollers mounted for permitting free rotation on the axles passing through the sealing ring.

EFFECT: enhanced reliability.

6 cl, 3 dwg

The technical field to which the invention relates.

The invention relates to the construction, chemical, metallurgical and other industries, where applicable units (rotary kilns, dryers and the like) with a rotating drum, and can be used to seal the gap between the rotating and stationary parts of the equipment.

The level of technology

Known sealing device of rotary kiln (see SU 1610215, IPC: F 27 7/24, publ. 30.11.90, bull. No. 44), comprising a fixed flange fixed to the camera, and in contact with him through the ring with antifriction coating the movable flange, made of box-shape, mounted on their shelves additional shelves box-shaped flange attached to the housing of the furnace. The annular part of the box-shaped flanges connected corrugated elements, forming a cavity coupled to a source of compressed air.

Execution and installation of box flanges can move one flange relative to the other allows the longitudinal (along the axis of the rotating drum) displacement rotary kiln about a fixed camera, with constant and equal over the entire surface of the ring contact preload is provided by the excess pressure in the cavity of the corrugated elements. However, the design of the device is tion prevents radial displacement of the furnace relative to the stationary camera and does not ensure complete tightness of the contact gap, what is significant disadvantages of this solution.

A device for sealing a rotary kiln (see SU 1151804, IPC: F 27 B 7/24, publ. 23.04.85, bull. No. 15), containing mounted on the fixed camera housing with a sealing element on the free end of which is fixed brackets installed in them supporting rollers. In the case of rotary kiln is made of a metal ring attached to the contact ring, the surface of which are rolled support rollers. On the brackets with supporting rollers placed additional sealing elements. During operation of the furnace the slip ring rotates with the kiln shell. The primary sealing element attached at one end to the casing and another end supported via the supporting rollers on the cylindrical surface of the contact ring is pressed against this surface by means of a rope with a load. However, the wear of the main sealing element in the known solution is minimized due to the introduction in the design of the rollers and installation on brackets, these rollers additional sealing element, which takes over the work of friction. Mounted on the rotary kiln and a stationary casing pilotmouse rings form a labyrinth designed to prevent the ingress of dust into the designated account is the support rollers. However, the presence of this maze does not provide integrity of such seals, the design of the sealing elements and their loose contact with the surface of the ring also causes a low degree of tightness. However, you have not solved the problem of free movement relative to each other rotating and stationary parts of the furnace, because the hardness of all parts of the construction seals and limited their mobility relative to each other prevents both longitudinal and radial displacement of the end face of the rotary drum relative to the stationary camera.

The task of ensuring the ability to move the face ends of the casing rotary kiln in the radial direction (the problem beating), as well as the possibility of longitudinal displacement relative to each other of the drum and a stationary part of the furnace solved in the design of the seal rotary kiln adopted for the prototype of the proposed device (see ed. St. SU 996826 (IPC: F 27 B 7/24, publ. 15.02.83, bull. No. 6), which contains:

- fixed to the body of the furnace and rotating together with her guide rings mounted with the formation of an annular radial groove between them;

- o-ring housed in an annular radial groove and held against rotation by means of cylindrical rollers with one end mounted in the set is cnyh nests sealing ring, and the other mounted in a longitudinal groove of a stationary camera that provides the possibility of longitudinal displacement of the drum relative to the stationary camera;

- elastic casing, through the shell connecting the sealing ring housing fixed camera.

The main drawback of the device, taken as a prototype, is the low degree of tightness, which can provide this seal. Moreover, if the seal be applied to the unit, in which the main problem is the emissions of gas component, this seal may not solve the problem, since the presence of gaps between the guide surfaces of the rings and the sealing ring makes such a device is unsuitable for solving this problem. If the seal is applied, for example, drying drums, the main drawback of this design is the low reliability, because the control balls that are designed to reduce friction between the surfaces of the rotating guide ring and the surface of the stationary sealing ring, directly in the area of the dust cloud implies that the gap between these surfaces will be immediately clogged with dust, the function of the balls will be neutralized. Will happen or jamming or friction between the sealing and guide rings, which will lead to their symptom is su and full depressurization device.

Disclosure of inventions

The claimed invention solves the problem of increasing the degree of tightness of the seal, which closes the docking area of the rotating drum and the stationary part of the machine, and increase reliability.

The problem is solved by the fact that in the sealing device of rotary kiln containing the flexible casing, one end of which is fixed to the camera, and the other is associated with the installed coaxially rotating drum sealing ring, made with means preventing its rotation, as well as containing fixed on a rotating drum rings, one of which is more distant from the end than the other ring is a guide for movement matkovich elements, according to the present invention is directed to the drum edge of the sealing ring is made of a bifurcated into parts covering two sides of another ring which, as well as guiding ring, mounted on a rotating drum, but closer to his face. This ring is in this case becomes a contact. It is continuous and provides a reliable sealing contact with the sealing ring, but not with its outer surface and inner volume (groove) o-ring, open-end edges facing the drum. This groove in the body will condense the high rings may be for example, in the form of an annular groove on the inner edge of this ring. However, it is preferable to perform the bifurcated edge of the sealing ring in the form of two additional rings attached to the outer edge to the inner edge of the main rings, missing between them. This kind of performance, on the one hand, provides the necessary contact force between the surfaces of these additional rings and side surfaces of the contact ring due to the rigidity of the mounting of additional rings to the main part of the sealing ring. On the other hand, this effort will be optimal and "self" due to the fact that the additional ring is fixed only on the outer edge (perimeter), and the inner edge are free to shift in different directions. This effect is seen most clearly if additional o-rings are made of heat-resistant rubberized material with an excellent elasticity. Unlike the prototype of this solution provides a reliable sealing of the sealing device, as excluded any gaps between the rotating contact ring and a stationary sealing ring and the friction in the design of the device is minimized, because in contrast to the known solutions (e.g., SU 1610215), in which the width of the ring is the first contact strip has a considerable size, in the inventive solution, this width may be close to the line.

Creating contact between the sealing ring and the ring, which is fixed on a rotating drum closer to its end than the guide ring, and therefore closer to the gap between the rotating drum and the stationary part, provided removal guide and chetkovich elements outside the zone of movement of dust flux and, accordingly, eliminated the entering of dust particles, resulting in improving the reliability of the device. However, the essential feature for solving the task is executing matkovich elements in the form of rollers mounted for free rotation on the axis passed through the sealing ring. This design ensured that the main reference perceiving almost the entire load, link in the device is a guide ring and rollers, i.e. excluded transmission power load due to the weight of o-rings, cover, and load caused by the beating and longitudinal displacement of the drum and the camera on a forked end part of the sealing ring, performing a primary function of the device - seal. It also improves sealing and reliability.

In a particular implementation of the proposed solutions design at the trojstva can be performed as follows. This performance can be used in the case where a still camera, for example the discharge pipe rotary kiln has a smaller diameter than the diameter of the rotating drum. In this case, the device must be provided with a flange attached to a fixed camera. When this mechanical end still camera covered face and is made of stepped form, the end of the rotating drum. Guide ring fulfill posted on the side of the drum, which has a larger diameter, and the contact ring on the end portion of the drum is made with a smaller diameter. It is desirable that the sealing ring is parallel to the flange. Then the o-ring in conjunction with elastic casing and above the flange forms a chamber with a U-shaped cross-section. The camera spans around the perimeter of the gap between the rotating drum and a stationary camera and can be performed in the lower part with outlet pipe. This particular implementation of the inventive solution is characterized by the fact that the dust in a timely manner and without additional efforts will be deleted from the volume of the sealing device.

Preferably means preventing rotation of the sealing ring in the form of a pin, one end of which may be passed through the sealing ring (or fixed N. the o-ring is another known way), and the second end is placed in the cutout made in the flange of the stationary camera. Such embodiment provides for retention of the sealing ring against rotation, however, is not fixed rigidly, which is undesirable because the o-ring must have a certain freedom of movement to ensure the possibility of bias and radial beating movable and fixed parts of the furnace. The notch in the flange of the outer side can be closed airtight cap to avoid leakage of dust into the environment.

In the particular case, the guide ring is made with a T-shaped cross-section, and the rollers with ribs, covering the horizontal shelf guide ring. This ensures the reliability of contact in the host device, performing a guiding function, while retaining the possibility of longitudinal movement of the drum relative to the stationary camera due to the fact that the rollers are placed on the axes, passed through the sealing element, which has a certain freedom of bias, as well as due to the fact that the casing is made of elastic and prevents relative displacement of the constituent elements of the device.

The execution of the contact ring on the outer edge with the side bevels makes better contact of these surfaces with covering their facilities is different rings, forming a bifurcated edge of the sealing ring, thereby increasing the degree of sealing of the device.

Brief description of drawings

The invention is illustrated by drawings, on which:

figure 1 - schematic representation of the sealing device of the drying drum, longitudinal section;

figure 2 - section a-a in figure 1, a view of the sealing ring in the plan;

figure 3 - section b-b In figure 1, illustrating the placement of the support rollers on the rotating drum.

The implementation of the invention

The sealing device of rotary kiln includes a flange 1, is fixed on the end part of the fixed camera 2, the sealing ring 3, the flexible casing 4, one edge of which is fixed on the flange 1, and the other on the sealing ring 3. On the rotating drum 5, the front end of which is made of stepped form, a fixed guide ring 6 and the contact ring 7. The rollers 8 are installed with the possibility of free rotation on the axis 9, missed and fixed on the reverse side of the sealing ring 3, and in contact with the track guide ring 6. The sealing ring 3 is made with extra rings 10 and 11, forming a forked end of the sealing ring in the form of a double seal, covering two sides of the contact ring 7. The surface is ti rings 10 and 11 due to the elasticity of the material is pressed to the side bevels of the contact ring 7. The flange 1, the flexible casing 4 and the sealing ring 3 with the contact ring 7 forming chamber 12, covering the drum 5 and the stationary camera 2 on their perimeter and the area of their connection, and the gap between their butt ends is within the scope of this camera. In the lower part of the chamber 12 is made with a conical constriction forming the outlet 13 to remove dust from camera 12. In the area of the nozzle 13 on the sealing ring 3 fixed pin 14, preventing rotation of the sealing ring 3. The free end of the pin 14 enters the groove 15 made in the flange 1. The outer side of the groove is sealed closed by a cap 16.

The device operates as follows.

The drum 5 rotates about its axis with some runout (eccentricity), and the gap Z between the fixed camera and the drum continuously varies the eccentricity. O-ring 3 rests on the roller 8 in contact with the treadmill guide ring 6, and through the pin 14 does not rotate with the drum, and only moves in the plane perpendicular to the axis of rotation of the drum by the amount of eccentricity. Flange rollers 8 hold the sealing ring 3 against axial displacement, making contact ring 7 regardless of the beating of the drum is always in contact with additional rings 10 and 11 uploaddialog the ring 3. That is, there is no relative axial and radial displacement of the contact ring 7 and the sealing ring 3 with its additional rings 10 and 11. The casing 4 through flexibility permits relative swinging movement of the sealing ring 3 and the flange 1 stationary camera, and simultaneously creates a complete seal between the inner surface of the rotating drum and a stationary camera. Dust accumulating freely discharged through the pipe 13.

1. The sealing device of rotary kiln containing the flexible casing, one end of which is fixed to the camera, and the other is associated with the installed coaxially rotating drum sealing ring, made with means preventing its rotation, mounted on a rotating drum rings, one of which is more distant from the end than the other ring is a guide for movement matkovich elements, characterized in that the facing to the drum edge of the sealing ring is made of a bifurcated into parts covering two sides of the other, mounted on a rotating drum, the contact ring, with the roller elements are in the form of rollers, mounted for free rotation on the axis passed through the o-ring.

2. The device according to claim 1, characterized in that it provided the but the flange, fixed the camera, face the end of which covered the face, made of stepped form, the end of the rotating drum, while the guide ring located on the side of the drum, which has a larger diameter, and the contact ring on the end portion of the drum, is made smaller in diameter, the seal ring is parallel to the flange and together with him and with elastic casing forming a chamber with a U-shaped cross-section, covering the perimeter of the gap between the rotating drum and a stationary camera and made in the lower part with outlet pipe.

3. The device according to claim 1 or 2, characterized in that. forked edge of the sealing ring is designed as two additional rings attached to the outer edge to the inner edge of the main rings, missing between them.

4. The device according to 3, wherein the additional ring is made of heat-resistant rubberized material.

5. The device according to claim 2, characterized in that the means preventing rotation of the sealing ring, made in the form of a pin, one end of which is passed through the sealing ring and the second end is placed in the cutout made in the flange of the stationary camera.

6. The device according to claim 1, characterized in that the guide ring is made with a T-shaped cross-section is, thus the rollers are made with flanges covering the horizontal shelf guide ring.

7. The device according to claim 1, characterized in that the contact ring on the outer edge is made with the side bevels.