Combined labyrinth sealing device

Abstract

The utility model relates to the technical field of coal mills, and particularly discloses a combined labyrinth sealing device which comprises a dynamic sealing disc and a static sealing disc which are nested with each other, a high-silicon flexible sealing strip is filled between the dynamic sealing disc and the static sealing disc; the dynamic sealing disc and the static sealing disc are mutually nested and sealed, the dynamic sealing disc is fixed on the auger shaft of the spiral conveyor of the coal mill in a sealing manner, and the static sealing disc is fixed on a box body of the spiral conveyor of the coal mill, so that an original gap between a shaft and a hole is converted into a gap between the dynamic sealing disc and the static sealing disc; therefore, under the mutual nesting and grinding of the movable sealing disc and the static sealing disc, the sealing effect is better, cold and hot air cannot leak out of the stranding cage shaft, the effect of reducing air leakage and ash leakage is achieved, and the problem that an existing flexible sealing strip is poor in sealing performance due to long-term abrasion is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mills, in particular to a combined labyrinth sealing device. Background Art

[0002] A coal mill is a mechanical device used to crush coal into fine powder, and is mainly used in thermal power plants, cement plants, steel mills and other industries. The working principle of a coal mill is to use mechanical force (such as impact, extrusion, grinding, etc.) to crush large pieces of coal into fine powder suitable for combustion or industrial use.

[0003] Due to the uneven force of the coal mill screw conveyor and the frequent displacement of the cage shaft during rotation, the manufacturer reserved a 2mm gap at the cage shaft in the original design. In order to prevent air and ash leakage from the gap, soft seals such as asbestos packing are used on the joint surface here in the design. At the same time, a sealing air with higher wind pressure is installed on the sealing surface (this sealing air serves as a shaft end seal on the one hand and a cooling function on the other).

[0004] However, the above-mentioned disclosed solutions have the following shortcomings: because the screw conveyor continuously bears forces from different directions during rotation, the screw conveyor seal is often damaged and leaks air and dust, causing great trouble to safe, civilized and hygienic production on site; frequent replacement of seals not only reduces equipment reliability, but also increases the labor intensity of workers. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problems that the screw conveyor seal is often damaged and leaks air and dust because the screw conveyor continuously bears forces from different directions during its rotation, causing great trouble to safe, civilized and hygienic production on site; frequent replacement of seals not only reduces the reliability of the equipment but also increases the labor intensity of workers, and provides a combined labyrinth sealing device.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The utility model discloses a combined labyrinth sealing device, which comprises a dynamic sealing disc and a static sealing disc which are nested with each other; a high-silicon flexible sealing strip is filled between the dynamic sealing disc and the static sealing disc.

[0008] Furthermore, a first concentric groove is formed on the dynamic sealing disc; a second concentric groove is formed on the static sealing disc corresponding to the first concentric groove; and the first concentric groove and the second concentric groove are nested with each other.

[0009] Furthermore, the dynamic sealing disc is provided with a small clearance hole; the static sealing disc is provided with a large clearance hole.

[0010] Furthermore, the static sealing disk is provided with a plurality of countersunk holes.

[0011] Furthermore, the dynamic sealing disc is sealed and welded to the auger shaft of the screw conveyor.

[0012] Furthermore, the static sealing disc is fixedly connected to the box body of the coal mill screw conveyor.

[0013] The utility model provides a combined labyrinth sealing device, which has the following beneficial effects:

[0014] 1. The utility model achieves mutual sealing by nesting the dynamic sealing disc and the static sealing disc. By sealing and fixing the dynamic sealing disc on the auger shaft of the coal mill screw conveyor and the static sealing disc on the housing of the coal mill screw conveyor, the original gap between the shaft and the hole is converted into a gap between the dynamic sealing disc and the static sealing disc. As a result, the dynamic sealing disc and the static sealing disc are nested and grinded with each other, the sealing effect is improved, and hot and cold air cannot leak to the outside of the cage shaft, thereby achieving the effect of reducing air and ash leakage, and solving the problem of long-term wear and poor sealing of existing flexible sealing strips.

[0015] 2. The utility model nests the first concentric groove and the second concentric groove with a gap of two millimeters, so that even if there is shaking between the dynamic sealing disc and the static sealing disc during operation, it can be eliminated by the reserved gap of two millimeters. During operation, the dynamic sealing disc and the static sealing disc grind against each other, which makes the two joint surfaces smoother and the sealing effect better, so that hot and cold air cannot leak to the outside of the cage shaft, thereby achieving the effect of reducing air leakage and dust leakage, and solving the problem of long-term wear and poor sealing of existing flexible sealing strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings;

[0017] Figure 1 This is a first axonometric structural diagram of the present invention;

[0018] Figure 2 This is a second axonometric structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of a half-section side view of the structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the assembly cross-sectional structure of the utility model.

[0021] Explanation of the numbers in the figure: 1. Dynamic sealing disc; 2. Static sealing disc; 3. High-silicon flexible sealing strip; 4. Countersunk hole; 5. Small clearance hole; 6. Large clearance hole; 7. First concentric groove; 8. Second concentric groove. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0025] See also Figure 1-4 As shown, a combined labyrinth sealing device includes a dynamic sealing disc 1 and a static sealing disc 2 that are nested with each other; a high-silicon flexible sealing strip 3 is filled between the dynamic sealing disc 1 and the static sealing disc 2; when working, the dynamic sealing disc 1 and the static sealing disc 2 are sealed with each other, and the dynamic sealing disc 1 is sealed and fixed on the auger shaft of the coal mill screw conveyor, and the static sealing disc 2 is fixed on the box body of the coal mill screw conveyor, so that the original gap between the shaft and the hole is converted into a gap between the dynamic sealing disc 1 and the static sealing disc 2, so that the dynamic sealing disc 1 and the static sealing disc 2 are nested and ground with each other, so that the sealing effect is better, and hot and cold air cannot leak to the outside of the cage shaft, thereby achieving the effect of reducing air leakage and ash leakage, and solving the problem of long-term wear and poor sealing of the existing flexible sealing strip.

[0026] The dynamic sealing disc 1 is provided with a first concentric groove 7; the static sealing disc 2 is provided with a second concentric groove 8 corresponding to the first concentric groove 7; the first concentric groove 7 and the second concentric groove 8 are nested with each other; when working, the first concentric groove 7 and the second concentric groove 8 are nested with each other and the gap is two millimeters, so that even if there is shaking during operation of the dynamic sealing disc 1 and the static sealing disc 2, it can be eliminated by the reserved gap of two millimeters, and the dynamic sealing disc 1 and the static sealing disc 2 grind against each other during operation, which makes the two joint surfaces smoother and the sealing effect better, so that hot and cold air cannot leak to the outside of the cage shaft, thereby achieving the effect of reducing air leakage and dust leakage, and solving the problem of long-term wear and poor sealing of the existing flexible sealing strip.

[0027] A small gap hole 5 is provided on the dynamic sealing disc 1; a large gap hole 6 is provided on the static sealing disc 2; during operation, the small gap hole 5 makes it convenient to weld the dynamic sealing disc 1 to the auger shaft of the screw conveyor, thereby achieving high strength and high sealing performance, making the sealing effect of the mechanical structure itself good, and solving the problem of poor long-term sealing performance of the existing flexible sealing strip.

[0028] The static sealing disc 2 is provided with a plurality of countersunk holes 4. When in operation, the static sealing disc 2 can be fixed to the housing of the coal mill screw conveyor using fasteners through the plurality of countersunk holes 4, thereby being fixed as a fixed part.

[0029] The dynamic sealing disc 1 is sealed and welded to the screw conveyor auger shaft; during operation, the dynamic sealing disc 1 is fixed to the screw conveyor auger shaft by sealing welding, so that the dynamic sealing disc 1 can rotate along with the screw conveyor auger shaft, thereby realizing the dynamic sealing function, solving the problem that the existing flexible sealing strip does not move together with the moving structure, resulting in poor sealing and wear.

[0030] The static sealing disc 2 is fixedly connected to the housing of the coal mill screw conveyor; during operation, by fixing the static sealing disc 2 to the housing of the coal mill screw conveyor, it can be used as a fixed part, thereby enabling long-term and stable sealing and isolation, thereby solving the problem of wear and leakage of the existing single flexible sealing strip.

[0031] The present invention is characterized in that when using, the dynamic sealing disc 1 and the static sealing disc 2 are mutually nested and sealed, and the dynamic sealing disc 1 is sealed and fixed on the auger shaft of the coal mill screw conveyor, and the static sealing disc 2 is fixed on the box body of the coal mill screw conveyor, thereby realizing that the gap between the original shaft and the hole is converted into the gap between the dynamic sealing disc 1 and the static sealing disc 2. As a result, the dynamic sealing disc 1 and the static sealing disc 2 are mutually nested and ground, the sealing effect is better, and the hot and cold air cannot leak to the outside of the cage shaft, thereby reducing the effect of air leakage and ash leakage, and solving the problem of long-term wear and poor sealing of the existing flexible sealing strip; the first concentric groove 7 and the second concentric groove 8 are mutually nested and the gap is two millimeters, so that even if there is shaking during operation of the dynamic sealing disc 1 and the static sealing disc 2, it can be eliminated by the two millimeters reserved gap, and during operation, the dynamic sealing disc 1 and the static sealing disc 2 grind against each other, which makes the two joint surfaces smoother and the sealing effect is better, so that the hot and cold air cannot leak to the outside of the cage shaft, thereby reducing the leakage The effect of air leakage solves the problem of long-term wear and poor sealing of existing flexible sealing strips; the small gap hole 5 makes it convenient to weld the dynamic sealing disc 1 to the screw conveyor auger shaft, thereby achieving high strength and high sealing, making the sealing effect of the mechanical structure itself good, solving the problem of long-term poor sealing of existing flexible sealing strips; the static sealing disc 2 can be fixed to the housing of the coal mill screw conveyor using fasteners through multiple countersunk holes 4, thereby achieving fixed integration as a fixed part; the dynamic sealing disc 1 is fixed to the screw conveyor auger shaft by sealing welding, so that the dynamic sealing disc 1 can rotate with the screw conveyor auger shaft, thereby realizing the function of dynamic sealing, solving the problem that the existing flexible sealing strip does not move with the moving structure, resulting in poor sealing and wear; by fixing the static sealing disc 2 to the housing of the coal mill screw conveyor, it can be used as a fixed part, so that long-term and stable sealing isolation can be performed, solving the problem that the existing single flexible sealing strip will wear and leak.

[0032] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A combined labyrinth sealing device, characterized in that; It comprises a dynamic sealing disc (1) and a static sealing disc (2) which are nested with each other; a high-silicon flexible sealing strip (3) is filled between the dynamic sealing disc (1) and the static sealing disc (2).

2. The combined labyrinth seal device according to claim 1, characterized in that: The dynamic sealing disc (1) is provided with a first concentric groove (7); the static sealing disc (2) is provided with a second concentric groove (8) corresponding to the first concentric groove (7); the first concentric groove (7) and the second concentric groove (8) are nested with each other.

3. The combined labyrinth seal device according to claim 2, characterized in that: The dynamic sealing disc (1) is provided with a small clearance hole (5); the static sealing disc (2) is provided with a large clearance hole (6).

4. The combined labyrinth seal device according to claim 3, characterized in that: The static sealing disk (2) is provided with a plurality of countersunk holes (4).

5. The combined labyrinth seal device according to claim 4, characterized in that: The dynamic sealing disc (1) is sealed and welded and fixed on the auger shaft of the screw conveyor.

6. The combined labyrinth seal device according to claim 5, characterized in that: The static sealing disc (2) is fixedly connected to the casing of the coal mill screw conveyor.

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