CN219588095U

CN219588095U - Baffle door shaft sealing structure

Info

Publication number: CN219588095U
Application number: CN202321305240.3U
Authority: CN
Inventors: 冯一骏
Original assignee: Huadian Power International Co ltd Shiliquan Power Plant
Current assignee: Huadian Power International Co ltd Shiliquan Power Plant
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-08-25
Anticipated expiration: 2033-05-26

Abstract

The utility model belongs to the technical field of sealing structures, and relates to a door shaft seal of a baffle door of a thermal power plant, in particular to a door shaft seal structure of a baffle door. According to the utility model, the shaft sleeve, the copper bush, the elastic sealing ring and the flange gland are sequentially overlapped and compressed, so that the joint of the graphite packing and the shaft is further mechanically sealed, the pressure and dust resistance are reduced, the auxiliary effect on the sealing of the graphite packing is achieved, the extrusion of the graphite packing caused by high-strength rotation of the shaft is reduced, the abrasion of the graphite packing is reduced, and the service life of the graphite packing is prolonged.

Description

Baffle door shaft sealing structure

Technical Field

The utility model belongs to the technical field of sealing structures, relates to a door shaft seal of a baffle door of a thermal power plant, and particularly relates to a door shaft seal structure of a baffle door.

Background

The thermal power plant is a factory for producing electric energy by using combustible matters (such as coal) as fuel, in the thermal power plant, a hot air baffle door for controlling medium flow is arranged in a hot air box for connecting a boiler, a coal mill and other equipment, the existing hot air baffle door shaft is mostly soft sealed by adopting graphite packing, the graphite packing is sleeved on the door shaft and is rotationally connected with the door shaft through a bearing, the graphite packing seals a gap between the door shaft and the baffle door, so that the packing is tightly contacted with the door shaft and the shaft sleeve to achieve a sealing effect, and particularly as shown in fig. 4, the graphite packing is extruded and worn in the repeated rotation process of the door shaft, and a certain gap is generated between the door shaft and the graphite packing after a period of operation due to easy abrasion of the graphite packing, so that the door shaft of the baffle door is damaged in sealing, ash leakage and low reliability.

The door shaft sealing damage to graphite packing wearing and tearing lead to, and current solution is the periodic replacement graphite packing, and economy and maintenance cost are higher, still prevent ash leakage through increasing baffle door shaft packing gland and through the compactness of adjustment graphite packing, and the problem of leakage of ash and air, and nevertheless the sealed clearance grow between graphite packing wearing and tearing and the door shaft after the long-term operation of graphite packing can not be effectively overcome to above-mentioned scheme to the scheme to cause environmental pollution around and.

Disclosure of Invention

The utility model aims to provide a baffle door shaft sealing structure, which aims to solve the problems that the graphite packing wear and the sealing gap between door shafts are increased and ash and air leakage are caused in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a baffle door shaft seal structure, includes graphite packing and auxiliary seal structure, graphite packing and auxiliary seal structure cover are established on the door shaft, graphite packing and auxiliary seal structure set up in parallel.

Further, the auxiliary sealing structure comprises a sealing gland and an elastic sealing ring, the sealing gland is of a sealing structure, the sealing gland cover is arranged at the joint of the graphite packing and the door shaft, the sealing gland cover is sleeved on the door shaft, an annular sealing cavity is formed between the sealing gland and the door shaft, and the elastic sealing ring is arranged in the annular sealing cavity.

Further, a plurality of elastic sealing rings are arranged, and the plurality of elastic sealing rings are arranged in parallel along the axial direction of the door shaft.

Further, the elastic sealing ring is arranged at intervals through the limiting piece, the whole limiting piece is of an annular structure, the limiting piece is integrally sleeved on the door shaft, the limiting piece is provided with a plurality of limiting grooves along the axial direction, and the elastic sealing ring is arranged in the limiting grooves.

Further, the elastic sealing ring is a spring energy storage sealing ring.

Further, the auxiliary sealing structure is rotationally connected with the door shaft through a shaft sleeve, and the shaft sleeve is sleeved on the door shaft; the two ends of the shaft sleeve are respectively abutted against the sealing gland and the graphite packing, the shaft sleeve is fastened with the sealing gland through bolts, and the elastic sealing ring is arranged between the shaft sleeve and the sealing gland.

Further, copper tiles are arranged at the gaps between the shaft sleeve and the end parts of the door shaft, and are sleeved on the door shaft.

Further, the shaft sleeve is provided with a supporting seat, and the supporting seat is fixed around the circumference of the shaft sleeve.

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

1. the auxiliary sealing structure is arranged at the joint of the gate shaft and the graphite packing, so that the joint of the graphite packing and the gate shaft is further mechanically sealed, and the auxiliary sealing structure is used for further reducing pressure and preventing dust, so that the problems of ash leakage and air leakage after the sealing gap between the abrasion of the graphite packing and the gate shaft is enlarged and environmental pollution are prevented after the graphite packing runs for a long time; meanwhile, the sealing of the graphite packing is achieved, extrusion of high-strength rotation of the door shaft to the graphite packing is reduced, abrasion of the graphite packing is reduced, the service life of the graphite packing is prolonged, and reliability of the device is improved.

2. The rotary type multi-layer metal sealing piece is structurally pressed and comprises a shaft sleeve, a copper bush, an elastic sealing ring and a sealing gland which are sequentially overlapped, wherein the metal sealing piece has the performances of high temperature resistance, corrosion resistance, scouring resistance and the like, can adapt to severe environments such as high temperature, fly ash and the like, and is also suitable for working conditions of high-strength rotary sealing; the sealing assembly is rotationally connected with the door shaft through the shaft sleeve, the shaft sleeve is suitable for being applied to the working condition of high-strength rotary sealing, and the friction heating value generated by rotation is small, so that the sealing assembly is suitable for most high-temperature and low-temperature sealing environments.

3. The sealing assembly comprises a spring energy storage sealing ring, the spring energy storage sealing ring is provided with a plurality of groups, the spring can store energy infinitely, the problem of packing abrasion is avoided, and long-term and thorough sealing is achieved.

Drawings

FIG. 1 is a cross-sectional view of a flapper door shaft seal of the present utility model;

FIG. 2 is a schematic cross-sectional view of a seal assembly;

FIG. 3 is a schematic perspective view of a seal assembly;

FIG. 4 is a schematic diagram of a conventional graphite packing seal structure;

the device comprises a 1-door shaft, a 2-sealing gland, a 3-elastic sealing ring, a 31-spring energy storage sealing ring, a 32-limiting piece, a 4-copper bush, a 5-shaft sleeve, a 6-supporting seat, a 7-sealing plate, an 8-compression bolt, a 9-fastening bolt, a 10-channel steel, an 11-baffle door and a 12-graphite packing.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, but the present utility model is not limited to the embodiments described below.

Examples

Referring to fig. 1, this embodiment provides a door shaft sealing structure of a baffle door, including graphite packing 12 and auxiliary sealing structure, connect through the bearing between graphite packing 12 and the door shaft 1, form soft seal between graphite packing and the door shaft and the baffle door, because graphite packing is easy wearing and tearing, the sealed clearance grow between the door shaft after the graphite packing wearing and tearing, leads to the medium to reveal, consequently set up auxiliary sealing structure in graphite packing 12 and door shaft 1 junction, graphite packing 12 and auxiliary sealing structure set up side by side on door shaft 1, auxiliary sealing structure rotates with door shaft 1 to be connected.

Specifically, the whole auxiliary sealing structure is rotationally connected with the door shaft 1 through the shaft sleeve 5, one end of the shaft sleeve 5 is abutted against the graphite packing 12, the friction heating value generated by rotation is small, and a cooling device is not required to be arranged; when the door shaft 1 rotates, the auxiliary sealing structure does not rotate along with the door shaft, the sealing gland 2 is arranged at the other end of the shaft sleeve 5, the sealing gland 2 is preferably a flange cover to serve as a shaft seal, the shaft sleeve 5 and the flange cover are fastened through the compression bolt 8, the shaft sleeve 5 and the flange cover are integrally sleeved on the door shaft 1, the shaft sleeve 5 and the flange cover form an annular sealing cavity, and a sealing assembly is arranged in the sealing cavity to form an integral auxiliary sealing structure.

Specifically, referring to fig. 2 and 3, the sealing assembly includes a limiting member 32 and an elastic sealing ring 3, the limiting member 32 is in an annular structure, the limiting member 32 is sleeved on the door shaft 1, the limiting member 32 is axially provided with a plurality of limiting grooves, the elastic sealing ring 3 is correspondingly provided in a plurality of limiting grooves, and the elastic sealing ring 3 is arranged in the limiting grooves; in practice, the number of the limiting grooves and the number of the elastic sealing rings can be set according to the bearing strength of the door bearing, and in this embodiment, the number of the limiting parts is 3, and the number of the elastic sealing rings is correspondingly set to 3.

The elastic sealing ring is preferably a spring energy storage sealing ring 31, the spring energy storage sealing ring 31 is preferably an O-shaped structure, the spring energy storage sealing ring 31 is sleeved on the door spindle 1, the spring energy storage sealing ring is composed of a polymeric material sealing shell and a corrosion-resistant stainless steel metal spring, the spring energy storage sealing ring can be suitable for wide high and low temperature ranges, the sealing ring is arranged in a limit groove, the spring is pressed to form outward tension, the sealing lip is made to be clung to the limit groove, and the spring can permanently provide elasticity for the sealing lip to compensate for abrasion and eccentricity of matched parts to form sealing; the door spindle pressure can assist the spring to store energy, and the greater the pressure is, the more fully the sealing lip is attached to the limit groove, so that the sealing is formed;

the spring energy storage sealing ring has small friction heating value, is suitable for most high-temperature and low-temperature sealing cavities, can solve the problems of air leakage and ash leakage of the door shaft of the baffle door 11 existing at the parts with higher temperature and wind pressure such as a smoke duct of a thermal power plant, ensures the sealing effect, can store energy infinitely, avoids the problems of ageing and abrasion of filling materials, and achieves the long-term sealing effect.

The end part of the shaft sleeve 5 and the end part of the door shaft 1 are provided with gaps, the gaps of the end parts are provided with copper tiles 4, the copper tiles 4 play a role in reducing the gaps between the door shaft 1 and the shaft sleeve 5, and the friction force between the door shaft 1 and the shaft sleeve 5 is reduced while the sealing effect is ensured.

In order to assist the stability of the sealing structure, a supporting seat 6 is arranged, the supporting seat 6 is further arranged to be of a sealing structure, the supporting seat 6 is covered at the joint of the graphite packing 12 and the door shaft 1, the supporting seat 6 is fixedly arranged around the shaft sleeve 5 to support the shaft sleeve 5, and meanwhile, the joint of the graphite packing 12 and the door shaft 1 is further sealed; in order to enhance the connection strength between the supporting seat 6 and the shaft sleeve 5, a sealing plate 7 is arranged at the connection part of the supporting seat 6 and the shaft sleeve 5, the shaft sleeve 5 is simultaneously supported by the sealing plate 7, and the supporting seat 6 and the sealing plate 7 are fastened through fastening bolts 9.

Further, the channel steel 10 is arranged between the supporting seat 6 and the bearing seat of the graphite packing, and channel steel of different types can be selected according to the number and the size of the arranged elastic sealing rings, so that the distance between the supporting seat 6 and the graphite packing 12 is adjusted.

The baffle door shaft sealing structure of the embodiment has the following working principle: through axle sleeve, copper bush, elastic sealing circle and flange gland stack in proper order and compress tightly, carry out further mechanical seal to graphite packing and door axle junction for step down and hinder dirt, play the auxiliary role to graphite packing is sealed simultaneously, reduce the high-strength rotation of door axle and to the extrusion of graphite packing, reduce the wearing and tearing of graphite packing, extension graphite packing's life.

Claims

1. A baffle door shaft seal structure which characterized in that: the sealing device comprises a graphite packing (12) and an auxiliary sealing structure, wherein the graphite packing (12) and the auxiliary sealing structure are sleeved on a door shaft (1), and the graphite packing (12) and the auxiliary sealing structure are arranged in parallel.

2. The flapper door shaft seal of claim 1 wherein: the auxiliary sealing structure comprises a sealing gland (2) and an elastic sealing ring (3), wherein the sealing gland (2) is of a sealing structure, the sealing gland (2) is covered at the joint of the graphite packing (12) and the door shaft (1), the sealing gland (2) is sleeved on the door shaft (1), an annular sealing cavity is formed between the sealing gland (2) and the door shaft, and the elastic sealing ring (3) is arranged in the annular sealing cavity.

3. The flapper door shaft seal of claim 2 wherein: the elastic sealing rings (3) are arranged in plurality, and the elastic sealing rings (3) are arranged in parallel along the axial direction of the door shaft (1).

4. A flapper door shaft seal as claimed in claim 3 wherein: elastic sealing ring (3) are arranged at intervals through limiting pieces (32), the whole limiting pieces (32) are of annular structures, the limiting pieces (32) are integrally sleeved on a door shaft, a plurality of limiting grooves are formed in the limiting pieces (32) along the axial direction, and the elastic sealing ring (3) is arranged in the limiting grooves.

5. The flapper door shaft seal of claim 4 wherein: the elastic sealing ring (3) is a spring energy storage sealing ring (31).

6. The flapper door shaft seal assembly of any of claims 2-5 wherein: the auxiliary sealing structure is rotationally connected with the door shaft (1) through a shaft sleeve (5), and the shaft sleeve (5) is sleeved on the door shaft (1); the two ends of the shaft sleeve (5) are respectively abutted against the sealing gland (2) and the graphite packing (12), the shaft sleeve (5) is fastened with the sealing gland (2) through bolts, and the elastic sealing ring (3) is arranged between the shaft sleeve (5) and the sealing gland (2).

7. The flapper door shaft seal of claim 6 wherein: the shaft sleeve (5) is provided with a copper bush (4) in a clearance with the end part of the door shaft (1), and the copper bush (4) is sleeved on the door shaft (1).

8. The flapper door shaft seal of claim 7 wherein: the shaft sleeve (5) is provided with a supporting seat (6), and the supporting seat is fixed around the circumference of the shaft sleeve (5).