CN217481968U - Medium speed pulverizer lower carriage sealing device - Google Patents

Abstract

The utility model provides a lower frame sealing device of a medium-speed coal mill, which comprises a rotating disc and a lower frame sealing component, wherein the lower frame sealing component comprises a sealing ring body and a top cover ring body, a first carbon ring is arranged in a groove at the top of an inner cavity of the sealing ring body, an upper carbon ring spring is arranged in a groove at the side edge of the outer wall of the first carbon ring, a second carbon ring and a third carbon ring are respectively arranged in two grooves at the bottom of the inner cavity of the sealing ring body, a middle carbon ring spring in the groove of the second carbon ring and a lower carbon ring spring in the groove of the third carbon ring, and the inner walls of the second carbon ring and the third carbon ring are rotatably connected with the rotating disc, through the utility model, hard objects such as pebble coal and the like can be prevented from entering the sealing ring body, the service life is greatly prolonged, the operation period of the coal mill is effectively prolonged, the equipment maintenance workload is reduced, a large number of spare parts and maintenance cost are saved, the safe and stable operation of the coal mill is ensured.

Description

Medium speed pulverizer lower carriage sealing device

Technical Field

The utility model mainly relates to the technical field of coal-fired electric power and heat energy production, specifically to a lower frame body sealing device of medium speed coal mill.

Background

The medium speed coal mill is a device with pressure (positive pressure) inside in operation, and in order to prevent the leakage of gas and coal powder inside, a carbon-refining sealing ring is generally installed on a lower frame body of the coal mill, the sealing ring is a flange ring, sealed air is introduced into the flange ring, and the sealing ring is installed on the upper surface of the lower frame body through an inner protective cover.

The existing sealing device of the lower frame body of the medium-speed coal mill comprises a sealing ring body, a carbon ring and a carbon ring spring, in order to ensure the sealing function of the middle-speed coal mill when the medium-speed coal mill operates at positive pressure, the sealing air pressure in a sealing air chamber is higher than the primary air pressure (about 200 ℃) in a chamber (delta P is more than or equal to 2kPa), the pressure difference value is monitored during operation, most of the sealing air is blown into the primary air chamber through the gap at the upper part of a sealing shell at present, only a small part of the sealing air leaks into the atmosphere, thus the effect of preventing the primary air and dust in the primary air chamber from leaking outwards is achieved, the surrounding environment of the coal mill is improved,

however, the existing sealing device for the lower frame body of the medium-speed coal mill has the following problems: when stone coal and other hard objects enter the sealing ring body, the carbon ring often generates brittle fracture, and then the sealing device fails.

Based on this, we need to develop a novel lower carriage seal assembly, add the smart formula sealing ring of upper portion charcoal in original medium speed pulverizer lower carriage seal, when the coal pulverizer moves, guarantee to get into the inside sealed wind of atmoseal room and block hot primary air on the smart formula sealing ring of upper portion charcoal, protection lower part charcoal smart formula sealing ring, when the coal pulverizer is reserve, sealed wind is closed, if hot primary air baffle is closed untight, the smart formula sealing ring of superiors charcoal can prevent that hot primary air from carrying hard matters such as stone coal to get into the seal ring body, prevent that lower part charcoal smart formula sealing ring from suffering destruction.

SUMMERY OF THE UTILITY MODEL

The utility model mainly provides a frame body sealing device under medium speed pulverizer for solve the technical problem who proposes among the above-mentioned background art.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

the utility model provides a frame body sealing device under medium speed pulverizer, includes rolling disc and lower frame body seal assembly, lower frame body seal assembly includes sealed ring body and top cap ring body, and the top cap ring body is located sealed ring body outer wall upside, sealed ring body and top cap ring body all cup joint on the rolling disc, be provided with first carbon ring in the recess at sealed ring body inner chamber top, and first carbon ring inner wall is to rotate with the rolling disc and be connected, be provided with carbon ring spring in the recess of first carbon ring outer wall lateral margin, be provided with second carbon ring and third carbon ring in two recesses of sealed ring body inner chamber bottom respectively to and the lower carbon ring spring in well carbon ring spring in the second carbon ring recess and the third carbon ring recess, and second carbon ring and third carbon ring inner wall all are the swivelling joint with the rolling disc.

Furthermore, a plurality of connecting bolts and nuts on the connecting bolts are arranged between the sealing ring body and the top cover ring body.

Furthermore, one side of the outer wall of the sealing ring body is provided with a sealing air pipe connector.

Further, the first carbon ring, the second carbon ring and the third carbon ring have the same size.

Further, the first carbon ring, the second carbon ring and the third carbon ring are antimony-impregnated carbon rings.

Furthermore, the diameters of the upper carbon ring spring, the middle carbon ring spring and the lower carbon ring spring are the same and are all 4 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a lower carriage body seal assembly has realized that can prevent hard things such as pebble coal to get into the seal ring body, and life prolongs greatly, and the effectual operating cycle who prolongs the coal pulverizer has reduced the equipment maintenance work load, has saved a large amount of spare parts and maintenance cost, has ensured the safety and stability operation of coal pulverizer.

The present invention will be explained in detail with reference to the drawings and specific embodiments.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic cross-sectional view of the local connection between the sealing ring body and the rotating disc of the present invention.

In the figure: 1. rotating the disc; 2. a lower frame body sealing assembly; 21. a seal ring body; 211. sealing the air pipe connector; 22. a first carbon ring; 221. a carbon ring spring is arranged; 23. a second carbon ring; 231. a middle carbon ring spring; 24. a third carbon ring; 241. a lower carbon ring spring; 25. a top cap ring body; 3. and connecting bolts.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings, in which several embodiments of the present invention are shown, but the present invention can be implemented in different forms, and is not limited to the embodiments described in the text, but rather, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the use of the term knowledge in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2 again, the lower frame body sealing device of the medium speed coal mill comprises a rotating disc 1 and a lower frame body sealing assembly 2, wherein the lower frame body sealing assembly 2 comprises a sealing ring body 21 and a top cover ring body 25, the top cover ring body 25 is positioned on the upper side of the outer wall of the sealing ring body 21, the sealing ring body 21 and the top cover ring body 25 are both sleeved on the rotating disc 1, a first carbon ring 22 is arranged in a groove at the top of the inner cavity of the sealing ring body 21, and the inner wall of the first carbon ring 22 is rotatably connected with the rotating disc 1, an upper carbon ring spring 221 is arranged in a groove at the side edge of the outer wall of the first carbon ring 22, a second carbon ring 23 and a third carbon ring 24 are respectively arranged in two grooves at the bottom of the inner cavity of the sealing ring body 21, as well as a middle carbon ring spring 231 in the groove of the second carbon ring 23 and a lower carbon ring spring 241 in the groove of the third carbon ring 24, and the inner walls of the second carbon ring 23 and the third carbon ring 24 are rotatably connected with the rotating disc 1.

Please refer to fig. 2 again, a plurality of connecting bolts 3 and nuts on the connecting bolts 3 are disposed between the sealing ring body 21 and the top cover ring body 25, the connection between the sealing ring body 21 and the top cover ring body 25 is realized through the connecting bolts 3, a sealing air pipe connector 211 is disposed on one side of the outer wall of the sealing ring body 21, the connection to the sealing air pipe is realized through the sealing air pipe connector 211, the first carbon ring 22, the second carbon ring 23 and the third carbon ring 24 have the same size, the first carbon ring 22, the second carbon ring 23 and the third carbon ring 24 are antimony-impregnated carbon rings, the diameters of the upper carbon ring spring 221, the middle carbon ring spring 231 and the lower carbon ring spring 241 are the same and are all 4mm, and when the springs are installed, the radial force 158.34N should be applied to the full circumference of the carbon rings.

The utility model discloses a concrete operation as follows:

add upper portion charcoal essence formula sealing ring at current medium speed coal pulverizer sealing ring body 21, including last charcoal essence ring spring 221 and first charcoal essence ring 22, go up charcoal essence ring spring 221 size and first charcoal essence ring 22 material and original charcoal essence ring spring and the fine environmental protection of charcoal and keep unchanged, all charcoal essence ring spring diameters are preferred 4mm, the fine ring of antimony charcoal is preferably adopted to soak in the fine ring of charcoal, should make the fine ring full circumference of charcoal atress 158.34N during the installation spring, if there is the discomfort, variable spring length moves, in order to guarantee to seal well.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, if the method and the technical solution of the present invention are adopted, the present invention can be directly applied to other occasions without substantial improvement, and the present invention is within the protection scope of the present invention.

Claims (6)

1. The utility model provides a frame body sealing device under medium speed coal pulverizer, includes rolling disc (1) and lower frame body seal assembly (2), its characterized in that, lower frame body seal assembly (2) is including sealed ring body (21) and top cap ring body (25), and top cap ring body (25) are located sealed ring body (21) outer wall upside, sealed ring body (21) and top cap ring body (25) all cup joint on rolling disc (1), be provided with first carbon ring (22) in the recess at sealed ring body (21) inner chamber top, and first carbon ring (22) inner wall is to rotate with rolling disc (1) and is connected, be provided with carbon ring spring (221) in the recess of first carbon ring (22) outer wall lateral margin, be provided with second carbon ring (23) and third carbon ring (24) in two recesses of sealed ring body (21) inner chamber bottom respectively to and the lower carbon ring spring (231) in the recess of the well carbon ring spring in second carbon ring (23) recess and the third carbon ring (24) recess A ring spring (241), and the inner walls of the second carbon ring (23) and the third carbon ring (24) are rotatably connected with the rotating disc (1).

2. The sealing device for the lower frame body of the medium speed coal mill is characterized in that a plurality of connecting bolts (3) and nuts on the connecting bolts (3) are arranged between the sealing ring body (21) and the top cover ring body (25).

3. The sealing device for the lower frame body of the medium speed coal mill according to claim 2, wherein one side of the outer wall of the sealing ring body (21) is provided with a sealing air pipe connector (211).

4. The sealing device for the lower frame of the medium speed coal mill according to claim 1, wherein the first carbon ring (22), the second carbon ring (23) and the third carbon ring (24) are the same size.

5. The sealing device for the lower frame body of the medium speed coal mill according to claim 4, wherein the first carbon ring (22), the second carbon ring (23) and the third carbon ring (24) are antimony-impregnated carbon rings.

6. The sealing device for the lower frame body of the medium speed coal mill according to claim 1, wherein the upper carbon ring spring (221), the middle carbon ring spring (231) and the lower carbon ring spring (241) have the same diameter and are all 4 mm.

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