SK278409B6 - The seal with sliding ring for tightening the rotating tube opposite case - Google Patents

Abstract

A seal is tightening the rotating tube (1) according to the standing case (2a, 2b). The tightening ring (3) is connected with the tube (1) rotating together with this tube. The opposed ring (5, 5a, 5b) is connected with the case (2a, 2b) through the flexible compensatory (4a, 4b). The opposed ring (5, 5a, 5b) and the compensatory (4a and 4b) are drifted on the circuit area closed to the opposite (5, 5a, 5b) with the use of arranged rollers (6, 6a, 6b), the rotating axes of which are perpendicular to the circuit of the opposite ring (5, 5a, 5b). The rollers (6, 6a, 6b) are supported and are able of a rolling motion on the rails (7, 7a, 7b, 7c, 7d) being fixed on the standing case (2a, 2b). These rails can be inclined to the tightening ring (3) and they are able to create an inclined plane for the rollers (6, 6a, 6b). The opposite ring (5, 5a, 5b) is held, having very little requirements for space, and it is pressed to the tightening ring (3), with the use of the roller (6, 6a, 6b) located on the inclined plane.

Description

Technical field

The invention relates to a slide ring seal for sealing a rotary pipe against a standing cabinet.

BACKGROUND OF THE INVENTION

Such a slide ring seal and suitable methods for sealing the rotary pipe against a standing cabinet are known. As a rule, a compensator is used which is made of a flexible material, for example an impregnated fabric. This compensator is necessary to compensate for the different thermal expansion of the pipe and cabinet and to prevent damage to any of the components. Different thermal expansion of the oven and cabinet can be expected especially if there are temperature changes in the oven due to combustion. The pipe which is associated with the housing may, for example, form a known drum for a low-pressure combustion apparatus of EP-A 0 302 310. This device has a gas space in the standing cabinet, which must be sealed with a sliding ring seal against the inner space of the oven where low-temperature waste incineration takes place. The low-temperature combustion drum is part of a device for making a low-temperature combustion method.

Since the counter ring has known slip ring seals connected to the housing only by means of a flexible compensator that does not constitute a rigid connection, it is necessary to maintain the counter ring and compensator in the desired position by suitable means. To date, a variety of load-bearing structures have been used for this purpose. For example, a microphone crane is arranged above the device comprising the cabinet and the oven on which the cat is movable. A counter ring is then hung on the cat via ropes or chains. It is also possible to support the counter ring by means of a movably arranged structure which is arranged on the floor of the space where the entire device is stored.

The opposite ring changing its position must, in addition, be pressed by suitable means for the sealing ring. Only this allows the gas-tight closure. Until now, mechanical, pneumatic or hydraulic means have been used for this purpose. Conventional means are clamps that embrace the sealing ring and the counter ring on their circumference. These clamps have mechanical springs, pneumatic cylinders, or hydraulic cylinders which press against each other the sealing ring and the counter ring.

Conventional support structures or support devices for the counter ring and compensator require very costly inspection, since they must be guided equally when shifting the counter ring, which is conditioned by thermal conditions. In particular, care should be taken to ensure that the counter ring is held firmly in the carrier and that it cannot slip off the carrier. Conventional means for urging the opposite ring against the sealing ring also require constant inspection. In particular, care must be taken to ensure that the force of compression of the mechanical spring, pneumatic cylinder or hydraulic cylinder is always sufficiently high.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sliding ring seal in which the continuous ring 5 is sufficiently centered on the sealing ring without having to check the position of the support device. In addition, a sliding ring seal should be provided which does not need any means to press the opposite ring against the sealing ring to require frequent inspection.

The object of the invention is to provide a sealing ring according to the invention which is provided with such a sealing ring which is connected to the pipe, is coaxial with it and is rotatable with the pipe, as well as against the 15 light ring which is connected to the housing via a flexible compensator for compensating for pipe length variations, and which, with its face sealing face, is compressible on the face sealing face of the sealing ring for sealing the housing against the pipe, in particular with a single roller arranged to carry the opposite ring and compensating on the circumferential face and at least one rail which is mounted on a standing cabinet and on which at least one roller is supported and supported by a roller.

The main advantage of this solution is that the counter ring and compensator are held with very little space requirement. In addition, there is no need for a parallel guide of the carrier. In the event of a possible thermal elongation of the pipe, which results in a displacement of the sealing ring in the axial direction, the counter ring which is pressed against the sealing ring is simultaneously entrained. The rollers move on the rails. 35 This pulley and rail system provides good support for the pulleys in every position. Thus, no expensive guide of the lifting device is required for axial displacement of the sealing ring and the counter ring, which is conditioned by thermal expansion. 40 Thus, relatively expensive motor-driven devices are also dispensed with for such subsequent guidance.

In addition to holding the counter ring and compensator only with very little space requirement, optimal support is provided without any subsequent guidance of the lifting device.

An advantageous embodiment of the invention consists in that one face sealing face of one of the two opposing rings is pressed against the sealing ring on both opposing faces. 50 In this way, it is possible to seal the oven against two cabinets. In this case, each of the two opposite rings is connected to its housing by means of a separate compensator. Likewise, rollers are provided on each opposite ring, which can move along rails mounted on the housing. Thus, the slide ring seal for sealing the rotary pipe against two standing cabinets corresponds to a mirror-symmetrical duplication of the slide ring seal for one pipe and one cabinet. Opposite rings are connected to the single sealing ring 60 of the single pipe and connected to the housing by means of expansion joints.

Such a sliding ring seal is advantageously applicable, in particular, when two gas streams need to be separated from each other. In this case, the incoming gas and the off-gas can be used in the combustion, in particular in the aforesaid low-temperature combustion method.

The rails are preferably inclined in the direction of the axis of the rotatable sealing ring with a slope from the housing to the sealing ring. This creates an inclined plane for the pulleys. Thereby a gravity component is directed on the rollers in the direction of the sealing ring. By this force, the opposite ring is pressed against the sealing ring. With a suitable inclination of the rails, for example a slope of 15 ° to 40 °, in particular 25 °, with respect to the horizontal line, a force component of gravity is sufficient to press the opposite ring against the sealing ring gas-tight.

By means of the means for pressing the counter ring against the sealing ring, the advantage is that a sufficiently high contact force is available at any time, without the need to use pressure means such as mechanical springs, pneumatic or hydraulic cylinders, the function of which must be monitored continuously. A further advantage is that no additional means, such as compressors, are required for the operation of the pneumatic cylinders.

According to another advantageous embodiment, a further rail, such as a guide rail, is arranged parallel to the rail on which the pulley moves, such that the roller is guided between the two rails. The roller in conjunction with the two rails provides a lock against rotation of the opposite ring. As a result, the counter ring cannot be rotated about its axis by external forces. This precludes that the compensator cannot be damaged or even destroyed by such movement. Rotating the counter ring could cause the compensator to burst.

The pulley preferably has on its one side or on both sides a rim for guiding on the rail or on the guide rail. It is therefore possible to build a pulley similar to a railway car wheel. It can also have two rims and then actually has the form of a spindle wheel. A pulley equipped with a rim cannot be pushed out of the rail in the event of a radial condition of the opposite ring which may arise. When using only one rim, the pulley is held in a radial direction with respect to the opposite ring. Moreover, when using two wreaths, it is also held in the opposite direction. This achieves the advantage that the pulley cannot be lifted or away from the rail either in the rotary movement of the counter ring or in the radial lateral movement of the counter ring.

Preferably, the pulley has a rim on both sides, wherein the spacing of the rims and hence the width of the contact surface of the pulley is slightly greater than the width of the rail or guide rail. This creates a slight play for the radial movement of the opposite ring.

The distance between the rail and the guide rail is preferably slightly greater than the rolling diameter of the pulley. This allows a slight rotational movement of the opposite ring. The play of the pulleys between the rails prevents stresses in the material. At the same time, such a slight rotary movement cannot cause damage to the compensator. The pulley is held between the rails in spite of said play, since the overall diameter of the pulley with the rim is greater than the distance between the rail and the guide rail.

Preferably, the counter ring has a groove for the lubricant or glidant on its sealing ring facing the contact side. The use of a lubricant or glidant ensures both a gas-tight seal between the sealing ring and the counter ring, as well as easy sliding of the rings one after the other.

According to a preferred embodiment, the grooves on the counter ring are evenly distributed and are arranged obliquely with respect to the diameter of the counter ring. This ensures an optimal distribution of the lubricant or the lubricant.

A further advantageous embodiment of the seal according to the invention is that the rails are connected to the standing cabinet by means of a joint, whereby their inclination angle can be varied with respect to the axis of the rotatable sealing ring. This achieves the advantage that the amount of pressing force that presses the counter ring against the sealing ring is also variable. This contact force can be advantageously adapted to the instantaneous requirements by varying the inclination angle. This inclination angle can be varied even during operation, i.e. when the oven is rotating.

The main advantages of the slip ring seal according to the invention are that it requires only a small space and that a reliable seal is created without the need for the following support devices and costly compression means such as hydraulic cylinders and engines.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to the drawing.

In FIG. 1 is a schematic illustration of a slide ring seal in which the rotary tube is sealed against a standing cabinet.

In FIG. 2 shows a further embodiment of a slide ring seal in which the rotary tube is fixed against a standing cabinet.

In FIG. 3 shows a gasket in which the rotary tube is sealed against two standing cabinets.

In FIG. 4 shows another embodiment of a slide ring seal in which the rotary tube is fixed against two standing cabinets.

In FIG. 5 is a schematic cross-sectional view of a pulley equipped with two rims.

Fig. 6 schematically shows a counter ring provided with grooves.

In FIG. 7 shows the joint through which the rail is mounted on the housing as part of the slide ring seal.

DETAILED DESCRIPTION OF THE INVENTION

As seen in FIG. 1, a sealing ring 3 is attached to the pipe 1 to seal around its longitudinal axis of the rotary pipe 1 against the standing cabinet 2a. The sealing ring 3 is rotated together with the pipe 1. A counter ring 5a is connected to the standing cabinet 2a by means of a flexible pipe compensator 4a. . The flexible compensator 4a is made of a gas-tight flexible fabric. In order to hold the counter ring 5a in the correct position with respect to the sealing ring 3, a roller 6a is rotatably arranged on the peripheral surface of the counter ring 5a, the axis of rotation of which is perpendicular to the axis of the counter ring 5a. At least one first rail 7a is associated with the roller 6a. The roller 6a is supported on the rail 7a. The first rail 7a is arranged obliquely with respect to the axis of the pipe 1 and is fixedly connected to the housing 2a. The roller 6a and the first rail 7a are arranged such that the opposite ring 5a has a central position on the sealing ring 3. In order to prevent the roller 6a from moving up in the plane of the drawing, a second rail 5 is designated as a guide rail 8a. . The latter is arranged parallel to the rail 7a and is also rigidly connected to the housing 2a. In order not only to be pressed centrally with respect to the sealing ring 3 but also to the sealing ring 3, the rail 5a and the guide rail 8a, if any, are arranged obliquely with respect to the axis of the pipe 1. 8a from the housing 2a in the direction of the counter ring 5a. The angle to the horizontal line or to the axis of the pipe 1 is, for example, between 15 ° and 30 °. In particular, a value of 25 ° is preferred. The rail 7a forms an inclined plane for the roller 6a. The weight component of the roller 6a, the counter ring 5a and partly the compensator 4a presses the counter ring 5a onto the sealing ring 3 in the construction shown. The pressure force is so great that no additional fasteners are required. On the opposite side of the compensator 4, which is not shown in FIG. 1, a further identical arrangement of the rail 7a and the pulley 6a, and optionally the guide rails 8a, is provided. The sliding ring gasket is also sufficient for the i-25 ba with one rail 7a on both sides.

As seen in FIG. 2, the first rail 7b for the roller 6a can also be arranged parallel to the axis of the pipe 1, which in this case indicates horizontally. Furthermore, a second horizontal guide rail 8b can be arranged parallel to the horizontally arranged rail 7b, as shown in FIG. 2 also shown. When using the horizontal rail 7a and possibly the guide rail 8a, additional means must be provided to press the opposite ring 5a onto the sealing ring 3. For example, a known spring-loaded clamp 9 or a spring clamp is suitable for this purpose. The other slide ring seal arrangement of FIG. 2 is structurally identical to that of the slide ring seal of FIG. 1. 40

According to FIG. 3, the slide ring 1 is sealed with a dotted ring seal, rotating tube 1 against two standing cabinets 2a and 2b. A slip-on sealing ring 3 is connected to the pipe 1 and rotates with the pipe 1. A first opposing ring 5a is connected to the first housing 2a by means of the first flexible compensator 45a, the front side of which is associated with and facing the face of the sealing ring 3. Similarly, the second opposing ring 5b is connected by the second flexible compensator 4b. The face of the second opposing ring 5b is associated and facing the face of the sealing ring 3 which faces away from the first opposing ring 5a. To hold the opposing rings 5a and 5b and the flexible compensators 4a and 4b, a first pulley 6a is arranged perpendicular to the circumferences of the first opposing ring 5a, and likewise a second pulley 6b is rotatably mounted on the circumference of the second opposing ring 5b. The first roller 6a is supported on the lower side on the first horizontal rail 7b, which is arranged parallel to the axis of the pipe 1 from the outside of the compensator 4a, and 60 which is connected to the first housing 2a. Similarly, a second pulley 6b is supported at the bottom on the second horizontal rail 7c, which is connected to the second housing 2b. Similar to FIG. 1 and 2, parallel guide rails 8b and 65 8c, respectively, are associated with the rails 7b and 7c.

The two rails 7b and 7c may extend from the first cabinet 2a to the second cabinet 2b and may be connected to the two cabinets 2a and 2b, unless it is necessary to anticipate the movement of the two cabinets 2a and 2b against each other which could be caused by different temperatures by extensibility of cabinets 2a and 2b. The distance between the two rails 7b and 7c can be selected such that the first rail 7b with the guide rail 8c of the second roller 6b forms one rail. As the upper guide rail 8b of the first roller 6a, a third rail can be arranged at a suitable distance above the first rail 7b. When horizontal rails 7b, 7c and guide rails 8b, 8c are used, the rollers 6a and 6b serve only to center the two opposite rings 5a and 5b centered. In order to press the opposing rings 5a and 5b onto the sealing ring 3, for example, known U-shaped, commercially available terminals 9 need to be provided. 3, it is not apparent that on the side of the opposing rings 5a and 5b and the compensators 4a and 4b opposite to the pulleys 6a and 6b, the rollers 6a and 6b and the same rails 7b, 7c and possibly the guide rails 8b and 8c are arranged.

In the arrangement of FIG. 4 is a first pulley 6a, similar to the embodiment of FIG. 1, supported on the inclined first rail 7a, and in this slide ring seal, the clamps 9 are not required to press the two opposing rings 5a and 5b onto the sealing ring 3. The first rail 7a has a slope that points towards the sealing ring 3. Similarly, a second pulley 6b supported on the second inclined rail 7d, which also has a slope in the direction of the sealing ring 3. As already shown in FIG. 1, the gravity components of the pulleys 6a and 6b are sufficient to press both opposing rings 5a and 5b from opposite directions onto the sealing ring 3. For guiding the pulleys 6a and 6b, a guide rail 8a or 6b may be associated with each pulley 6a and 6b. 8d connected to a corresponding housing 2a or 2b, respectively. The rails 7a and 7d as well as the guide rails 8a and 8d are arranged at an inclination against each other. On the opposite side of the opposite rings 5a and 5b and the compensators 4a and 4b, which is not visible, further rollers 6a and 6b as well as additional rails are provided. 7a and 7d and optionally further guide rails 8a and 8d. The opposing rings 5a and 5b are as in FIG. 3 connected to associated boxes 2a or 2b by means of flexible compensators 4a and 4b.

The pulley 6 shown in FIG. 5, has a rim 10 and 11 on both sides. The pulley 6 moves along the lower rail 7, which has a circular cross-section. The guide rail 8, which also has a circular cross-section and which is arranged above the pulley 6, prevents the pulley 6 from being lifted above the rail 7. The rims 10, 11 prevent the pulley 6 from slipping from the rail 7 or from the rail 7 and the guide rail 8. only in one direction, it is sufficient to form a rim 10 on the pulley 6 on one side only. In order to keep a slight movement clearance for the roller 6, it is advantageous to make the rolling diameter of the roller 6 slightly smaller than the distance between the rail 7 and the guide rail 8. Similarly, the distance a between the two rims 10 and 11 of the roller 6 should be slightly larger than the diameter of the rail 7 and a guide rail 8. This creates a lateral movement clearance for the pulleys 6.

As seen in FIG. 6, are provided on the opposite ring 5 for receiving the glidant or lubricant, which permits a particularly good tight seal,

The grooves 12 are arranged, for example, at an angle to the diameter of the counter ring 5. However, the edges of the counter ring 5 do not touch. In FIG. 7 shows a joint 13 through which the rails 7a, 7d shown in FIG. 1 and 4 associated with housing 2a, 2b. This joint makes it possible to vary the inclination of the rails 7a, 7d. The joint 13 of FIG. 7 consists of a flat body 14 which is formed on the rail 7 and which is connected to the housing 2 in the form of a rod by means of a pin 15 which forms the pivot axis. A slot 16 is formed in the body 14, which has the shape of a circular arc that surrounds the pin 15. This slot 16 is fitted with a fastening screw 17 which is fixedly connected to the component 20. The inclination of the rail 7 can be varied continuously. In this case, the rail 7 is always fastened by means of a fastening screw 17. If necessary, the guide rail 8 can be fixedly coupled to the rail 7 at the desired distance.

In summary, in order to seal the rotary tube 1 against one or two standing cabinets 2a, 2b, one or two non-moving opposite rings 5, 5a, 5b which are connected to the sealing ring 3 which is connected to the pipe 1 are assigned. with housing 2a, 2b by means of compensators 4a, 4b. The opposite ring 5, 5a, 5b is held centered with respect to the sealing ring 3 by rollers 6, 6a, 6b which are arranged on its circumference and which are supported on the rails of the grooves 7, 7a, 7b, 7c, 7d. The opposing ring 5, 5a, 5b is pressed against the sealing ring 3 by the weight component of the pulleys 6, 6a, 6b, the opposing ring 5, 5a, 5b and the compensator 4a, 4b. Therefore, the pulley 6, 6a, 6b is supported on a rail 7, 7a, 7d which is connected to the housing 2a, 2b and which is inclined in the direction of the opposite ring 5, 5a, 5b.

Lifting of the rollers 6, 6a, 6b above the rails 7, 7a, 7b, 7c, 7d is prevented by the guide rails 8, 8a, 8b, 8c, 8d, which are arranged parallel to the rails 7, 7a, 7b, 7c, 7d.

The sliding ring seal requires very little space and does not require costly resources.

Claims (10)

PATENT CLAIMS Sliding ring seal for sealing a rotary pipe against a standing cabinet, characterized in that it is equipped with a sealing ring (3) which is connected to the pipe (1), is coaxial with it and is with the pipe (1) rotatable, on the other hand, opposite ring (5, 5a, 5b), which is connected to the housing (2a, 2b) by means of a flexible compensator (4a, 4b) to compensate for pipe length changes (1) and which is compressible by its face a sealing ring surface (3) for sealing the housing (2a, 2b) against the pipe (1) and at least one roller (6, 6a, 6b) arranged to carry the opposite ring (5, 5a, 5b) and compensator (4a) 4b) on the circumferential surface of the counter ring (5, 5a, 5b), and whose axis of rotation is arranged perpendicular to the circumferential surface of the counter ring (5, 5a, 5b), and at least one rail (7, 7a, 7b, 7c, 7d), which is mounted on a standing cabinet (2a, 2b), and on which at least one roller (6, 6a, 6b) is supported and supported by a roller. Sliding ring seal according to claim 1, characterized in that one face sealing surface of one of the two opposite sealing rings (5, 5a, 5b) can be pressed onto the sealing ring (3) on its two opposing face faces. pipe (1) against two cabinets (2a, 2b). Sliding ring seal according to either of Claims 1 or 2, characterized in that the rail (7, 7a, 7d) is inclined in the direction of pressing the opposite ring (5, 5a, 5b) onto the sealing ring (3). the axis of the rotatable sealing ring (3) inclined to the sealing ring (3) and forms an inclined plane for the rollers (6, 6a, 6b). Sliding ring seal according to one of Claims 1 to 3, characterized in that an additional rail is provided parallel to the rail (7, 7a, 7b, 7c, 7d) as a guide rail (8, 8a, 8b, 8c, 8d). and that the rollers (6, 6a, 6b) are guided between the two rails (7 and 8, 7a and 8a, 7b and 8b, 7c and 8c, 7d and 8d). Sliding ring seal according to one of Claims 1 to 4, characterized in that the roller 6 has a rim (10, 11) on one side or on both sides thereof, for guiding on the rail (7) or on the rail (7). and on the guide rail (8). Sliding ring seal according to claim 5, characterized in that the distance of the rail (7) from the guide rail (8) is slightly greater than the rolling diameter (d) of the roller (6). Slide ring seal according to one of claims 5 or 6, characterized in that the roller (6) has a rim (10 and 11) on both sides and that the distance (a) between the rims (10 and 11) is slightly larger than the width of the rail (7) or the rail (7) and the guide rail (8). Sliding ring seal according to one of Claims 1 to 7, characterized in that the counter ring (5) has a grease or sliding groove (12) on its contact side facing the sealing ring (3). Sliding ring seal according to claim 8, characterized in that the grooves (12) are evenly distributed over the counter ring (5) and are arranged obliquely with respect to the diameter of the counter ring (5). Slide ring seal according to one of Claims 1 to 9, characterized in that the rail (7) is connected to the standing box (2) by means of a joint (13) and that its inclination angle is variable relative to the axis of the rotatable sealing ring (3). ).