CN213575547U

CN213575547U - Novel sealing ring for coal mill

Info

Publication number: CN213575547U
Application number: CN202022713735.2U
Authority: CN
Inventors: 高壮; 李照扩; 李赞
Original assignee: Hebei Handan Power Generation Co Ltd
Current assignee: Hebei Handan Power Generation Co Ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-06-29
Anticipated expiration: 2030-11-20

Abstract

The utility model discloses a novel sealing ring for a coal mill, which comprises a circular ring body; the ring body is provided with a plurality of through holes, and all the through holes are parallel to the central axis of the ring body and are distributed at equal intervals along the circumferential direction of the ring body; the side surface of the ring body is provided with an annular step surface, and the step surface is communicated with the inner diameter of the ring body; the thickness of the ring body is 11-12mm, and the thickness between the step surface and the other side surface of the ring body is 6-7 mm. The utility model provides the high life of sealing washer saves consumptive material expenses such as lubricating oil, filter screen.

Description

Novel sealing ring for coal mill

Technical Field

The utility model relates to a coal pulverizer technical field, concretely relates to novel sealing washer for coal pulverizer.

Background

The double-inlet double-outlet low-speed cylindrical steel ball coal mill is suitable for grinding bituminous coal and lean coal, and comprises two symmetrical and independent grinding loops, wherein raw coal is unloaded from a raw coal bin through the coal feeder, and the coal enters a grinding cylinder body through a trunnion by the rotation of a spiral conveying device. The steel balls with different sizes are arranged in the barrel, when the barrel rotates, the steel balls are lifted to a certain height under the action of centrifugal force and friction force, and fall under the action of self gravity, and the coal is impacted, smashed and ground by the steel balls which fall freely to form coal powder. Hot primary air enters the coal mill through the central tube of the spiral conveying device to dry coal, the hot primary air carries coal powder out of the coal mill through the annular channel of the conveying device in the opposite direction of the raw coal, the qualified coal powder is directly conveyed to a boiler by the primary air after being separated by the separator to be combusted, and the unqualified coal powder returns to the coal mill to be ground again.

The gudgeon of coal pulverizer includes gudgeon rotating ring and gudgeon quiet ring, is equipped with the sealing washer between gudgeon rotating ring and the gudgeon quiet ring, and the material of sealing washer is the asbestos, and the effect of sealing washer lies in preventing that debris, steel ball bits, the coal cinder in the barrel from getting into between gudgeon pipe and the gudgeon, causes gudgeon internal surface and the wearing and tearing of gudgeon pipe. However, because the working temperature is high, and the working medium is fluidized coal powder, the asbestos sealing ring bears strong scouring, and belongs to an easily-worn part. The thickness of sealing washer design usually is 6(+0.5) mm, change the cycle and be 6-8 months usually, nevertheless open and stop comparatively frequently because of the coal pulverizer, long time inequality factor in operation, the wearing and tearing of coal pulverizer trunnion sealing washer cause sealed wind pressure to leak, the barrel is taken place when the powder phenomenon is run by the seal chamber, when polluting coal pulverizer room environment, also bring the maintenance pressure of equipment, the buggy that leaks pollutes coal pulverizer lubricating oil, the frequency of coal pulverizer change lubricating oil has been increased, and the expense of changing the low pressure lubricating oil filter screen, influence the normal operating of coal pulverizer, especially increased the unit area load of operation daytime.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the service life of the sealing ring is prolonged, and the material consumption cost of lubricating oil, a filter screen and the like is saved, the utility model provides a novel sealing ring for a coal mill, which comprises a circular ring body; the ring body is provided with a plurality of through holes, and all the through holes are parallel to the central axis of the ring body and are distributed at equal intervals along the circumferential direction of the ring body; the side surface of the ring body is provided with an annular step surface, and the step surface is communicated with the inner diameter of the ring body; the thickness of the ring body is 11-12mm, and the thickness between the step surface and the other side surface of the ring body is 6-7 mm.

The beneficial effects of the utility model are embodied in:

the sealing ring installation method comprises the following steps: the end face of the ring body and the trunnion static ring is fixed through bolts, the step face of the ring body is just opposite to the end face of the trunnion moving ring, and then the part of the ring body provided with the step face is located in a gap between the trunnion moving ring and the trunnion static ring, and the ring body of the rest part is located on the outer side of the gap and shields the gap.

After the sealing ring is used for a period of time, part of the ring body provided with the step surface is worn, the rest part of the ring body positioned outside the gap wraps the gap to form an annular sealing structure, the coal ball machine can be used for a longer period of time, so that the service life of the whole sealing ring can be prolonged to more than 12 months, and compared with the service life of the existing sealing ring, the service life of the sealing ring is prolonged by more than one time. In addition, after the service life of the sealing ring is prolonged, about 2 million yuan of lubricating oil, a filter screen, labor cost and the like are saved for each coal mill because the sealing ring is prevented from leaking, spare parts, materials and labor cost of 12 coal mills can be saved by 24 million yuan each year, the more equipment is, the more cost is saved, and the economic burden of an enterprise is reduced.

Preferably, the ring body with the thickness of 11-12mm is an outer ring body, and the ring body with the thickness of 6-7mm is an inner ring body; all the through holes are positioned in the outer ring body.

The thickness of the outer exchanger is close to twice of that of the inner ring, which is beneficial to improving the durability.

Preferably, the material of the ring body is asbestos.

Preferably, the inner part of the inner ring body is inlaid with copper wires.

Preferably, the inner part of the inner ring body is embedded with nickel wires.

After copper wires or nickel wires are added into the inner ring body, the wear resistance of the inner ring body is improved, and the service life of the whole sealing ring is further prolonged.

Preferably, a part of the side surface of the outer ring body extends along the axial direction, thereby forming an extension; the extension is annular in shape.

Preferably, the extension part is arranged on the same side as the step surface.

Preferably, the extension portion, the outer ring body and the inner ring body are integrated, and the end surface of the extension portion is a slope facing the circumferential side wall of the ring body.

Preferably, all the through holes are positioned on the outer ring body except the extension part.

Preferably, the extension portion has an inner diameter equal to an inner diameter of the outer ring body.

The extension extends towards the direction of trunnion rotating ring, has guaranteed that outer annular body covers the gap between trunnion rotating ring and the trunnion quiet ring completely, has increased simultaneously with the area of contact of trunnion rotating ring circumference lateral wall, has improved sealed effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic view of an extension portion of the present embodiment;

fig. 4 is a schematic structural diagram after the installation is completed in this embodiment.

In the drawing, a through hole 1, a step surface 2, an inner ring 3, an outer ring 4, an extension part 5, a trunnion movable ring 6 and a trunnion static ring 7.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1 and 2, the present embodiment provides a novel seal ring for a coal pulverizer, which includes a circular ring body made of asbestos. The ring body is equipped with a plurality of through-holes 1, and all through-holes 1 all are parallel with the center pin of ring body and along the equidistant distribution of circumference of ring body. The through hole 1 is used for a bolt to pass through for positioning and installation. The number of the through holes 1 is consistent according to the number of the bolts of the trunnion moving ring 6 and corresponds to one another. The side face of the ring body is provided with an annular step face 2, the step face 2 is communicated with the inner diameter of the ring body, the thickness of the ring body is 11-12mm, and the thickness between the step face 2 and the other side face of the ring body is 6-7 mm. The ring body with the thickness of 11-12mm is an outer ring 4 body, and the ring body with the thickness of 6-7mm is an inner ring 3 body; all the through holes 1 are positioned on the outer ring 4 body. The thickness of the outer exchanger is close to twice of that of the inner ring 3, which is beneficial to improving the durability.

As shown in fig. 4, the seal ring mounting method: the ring body passes through the bolt fastening with the terminal surface of trunnion quiet ring 7, and the step face 2 of ring body just faces with the terminal surface of trunnion rotating ring 6, and then makes the partial ring body that is equipped with step face 2 be located the gap between trunnion rotating ring 6 and the trunnion quiet ring 7, and the ring body of remaining part is located the outside in gap and shelters from the gap. After the sealing ring is used for a period of time, part of the ring body provided with the step surface 2 is worn away, the rest ring body positioned outside the gap wraps the gap to form an annular sealing structure, and the coal ball machine can be further normally used for a longer period of time, so that the service life of the whole sealing ring can be prolonged.

In order to prolong the service life of the inner ring 3, copper wires or nickel wires are embedded in the inner part of the inner ring 3. After copper wires or nickel wires are added into the inner ring 3, the wear resistance of the inner ring is improved, and the service life of the whole sealing ring is further prolonged.

As shown in fig. 3, in order to further improve the sealing effect, a part of the side surface of the outer ring 4 extends along the axial direction, and further forms an extension 5; the extension 5 is annular in shape. Specifically, the extension 5 is on the same side as the step surface 2. The extension part 5, the outer ring 4 and the inner ring 3 are integrated, and the end face of the extension part 5 is an inclined plane facing the circumferential side wall of the ring body. All the through holes 1 are located on the outer ring 4 body except the extension part 5, and the inner diameter of the extension part 5 is equal to that of the outer ring 4 body. Extension 5 extends toward trunnion rotating ring 6's direction, has guaranteed that the outer loop 4 body covers the gap between trunnion rotating ring 6 and the trunnion quiet ring 7 completely, has increased simultaneously with the area of contact of 6 circumference lateral walls of trunnion rotating ring, has improved sealed effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides a novel sealing washer for coal pulverizer which characterized in that: comprises a circular ring body; the ring body is provided with a plurality of through holes, and all the through holes are parallel to the central axis of the ring body and are distributed at equal intervals along the circumferential direction of the ring body; the side surface of the ring body is provided with an annular step surface, and the step surface is communicated with the inner diameter of the ring body; the thickness of the ring body is 11-12mm, and the thickness between the step surface and the other side surface of the ring body is 6-7 mm.

2. The novel seal ring for a coal pulverizer as defined in claim 1, wherein: the ring body with the thickness of 11-12mm is an outer ring body, and the ring body with the thickness of 6-7mm is an inner ring body; all the through holes are positioned in the outer ring body.

3. The novel seal ring for a coal pulverizer as defined in claim 1, wherein: the ring body is made of asbestos.

4. The novel seal ring for a coal pulverizer as defined in claim 2, wherein: and a copper wire is embedded in the inner ring body.

5. The novel seal ring for a coal pulverizer as defined in claim 2, wherein: and a nickel wire is embedded in the inner ring body.

6. The novel seal ring for a coal pulverizer as defined in claim 2, wherein: part of the side surface of the outer ring body extends along the axial direction, and an extension part is further formed; the extension is annular in shape.

7. The novel seal ring for a coal pulverizer as defined in claim 6, wherein: the extension part is arranged on the same side as the step surface.

8. The novel seal ring for a coal pulverizer as defined in claim 7, wherein: the extension part, the outer ring body and the inner ring body are integrated, and the end face of the extension part is an inclined plane facing to the circumferential side wall of the ring body.

9. The novel seal ring for a coal pulverizer as defined in claim 8, wherein: all the through holes are positioned on the outer ring body outside the extension part.

10. The novel seal ring for a coal pulverizer as defined in claim 9, wherein: the inner diameter of the extension part is equal to the inner diameter of the outer ring body.