CN114738486A

CN114738486A - Central discharging sealing structure of rotary dryer

Info

Publication number: CN114738486A
Application number: CN202110018202.9A
Authority: CN
Inventors: 赵旭; 韩东钊; 张春丽; 路原睿; 王天宝; 董富荣; 徐澍
Original assignee: Tianhua Institute of Chemical Machinery and Automation Co Ltd
Current assignee: Tianhua Institute of Chemical Machinery and Automation Co Ltd
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2022-07-12

Abstract

The invention relates to a central discharging sealing structure of a rotary dryer, which comprises a central discharging pipe, a discharging box and a central air shaft, and is characterized in that: a central discharging pipe bearing flange, a bearing and a central air shaft flange are respectively arranged on the central discharging pipe; the inner side of the discharge box is provided with a large bearing which is fixed on the central discharge pipe through an inner side bearing support and a bearing flange of the central discharge pipe respectively; the outer side of the discharge box is respectively provided with a discharge box bearing flange and an outer side bearing support, and the outer side bearing support is connected with a bearing outer ring sliding bearing seat; the bearing outer ring sliding bearing seat is provided with an outer side bearing, and the outer side bearing is connected with the bearing and the central air shaft flange; an annular supporting plate is arranged outside the outer side bearing support, and a reinforcing rib plate is arranged between the annular supporting plate and the central air shaft. The invention has the advantages of compact structure, low manufacturing and transforming cost, stability, no leakage and convenient and quick overhaul.

Description

Central discharging sealing structure of rotary dryer

Technical Field

The invention relates to a sealing structure, in particular to a central discharging sealing structure of a rotary dryer.

Background

With the rapid development of the chemical industry and the coal chemical industry, the size of the rotary dryer is more and more required due to the large capacity demand and the satisfaction of the environmental protection requirements of energy conservation and emission reduction. Along with the volume increase of equipment, the diameter increase of center discharging pipe, sealed face diameter increase, the friction linear velocity increases, leads to the sealed condition appearance that leads to the material to reveal often appearing because excessive wear of the ejection of compact of current structure.

The existing discharging seal is a cantilever-supported structure, and has the following defects:

the method has the advantages that in the installation process of the discharging box, whether spring hanging or spring supporting is adopted, the outer diameter of a packing box of the discharging box cannot be guaranteed to be concentric with a discharging sealing shaft sleeve, and the eccentric wear phenomenon of sealing packing is caused by eccentricity;

due to the cantilever structure, friction surfaces far away from the support bearing are seriously rubbed, the heat productivity is large, and the service life of the sealing filler is short;

thirdly, the metal hole ring is dislocated due to the abrasion of the filler, so that the metal hole ring is contacted with the rotary sealing friction surface, metal scraping is further caused, the sealing friction surface is damaged, a large amount of heat is generated, and the filler is burnt;

fourthly, due to abrasion of a sealing filler, a material leakage condition occurs after the sealing part operates soon;

due to the fact that friction and the center pipe beat per se, the discharging box vibrates greatly, and the service life of a pipeline connected with the discharging box is shortened.

Disclosure of Invention

The invention aims to solve the technical problem of providing a stable and leakage-free rotary dryer central discharging sealing structure.

In order to solve the problems, the invention provides a central discharging sealing structure of a rotary dryer, which comprises a central discharging pipe, a discharging box and a central air shaft, and is characterized in that: a central discharging pipe bearing flange, a bearing and a central air shaft flange are respectively arranged on the central discharging pipe; the inner side of the discharge box is provided with a large bearing which is fixed on the central discharge pipe through an inner side bearing bracket and a central discharge pipe bearing flange respectively; the outer side of the discharge box is respectively provided with a discharge box bearing flange and an outer side bearing support, and the outer side bearing support is connected with a bearing outer ring sliding bearing seat; the bearing outer ring sliding bearing seat is provided with an outer side bearing, and the outer side bearing is connected with the bearing and the central air shaft flange; an annular supporting plate is arranged outside the outer side bearing support, and a reinforcing rib plate is arranged between the annular supporting plate and the central air shaft.

And the matching degree of the bearing flange of the central discharging pipe and the spigot of the bearing and the central gas shaft flange is matched with the concentricity of the central discharging pipe.

The outer side bearing support and the bearing outer ring sliding bearing seat are matched through a spigot and fastened through bolts, and have uniform concentricity in the circumferential direction.

The large bearing and the outer bearing are matched in concentricity.

And the annular supporting plate and the dryer cylinder are provided with inspection and repair holes.

Compared with the prior art, the invention has the following advantages:

1. the central discharging pipe is respectively provided with a central discharging pipe bearing flange, a bearing and a central gas shaft flange, the discharging box is stably supported on the central discharging pipe by adopting a two-end supporting mode, one end of the bearing is a fixed end bearing, the other end of the bearing is a sliding end, in order to ensure that the discharging box body and the central gas shaft are not in thermal expansion synchronization, the sliding end adopts a bearing seat with a sliding outer ring, so that the thermal expansion freedom of the discharging box body and the central gas shaft is ensured, the good stability is ensured, and the scraping of a metal hole ring and a rotary friction surface of a central pipe is avoided.

2. According to the invention, the annular support plate is arranged outside the outer side bearing support, and the annular support plate and the dryer cylinder are provided with the inspection access holes, so that on the premise of ensuring the strength, the leakage of the outer side seal of the discharge box can be conveniently observed, and the tightness of a packing gland bolt can be conveniently adjusted by a worker.

3. The invention adopts the two-end support, and can fundamentally solve the problems that the rotating central discharge pipe sealing friction surface is eccentric with the sealing filler in the discharge box due to the fact that the discharge box body is not concentric with the central discharge pipe caused by the previous cantilever support, so that the filler is seriously worn and has large heat productivity, and the metal hole ring is rubbed with the metal of the friction sealing surface due to the abrasion deformation of the filler, so that huge heat is generated, the filler is burnt, and finally the leakage of the material is caused by the sealing failure.

4. The discharging box is connected through the bearing, so that the discharging box is simple to install and high in installation precision, and the uniform gap and high concentricity of a sealed cavity formed by the discharging box and the central discharging pipe are ensured.

5. The invention has compact structure, low manufacturing and reconstruction cost, convenient and quick maintenance and the same sealing form with the prior arrangement.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

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

Fig. 2 is a schematic view of the inside sealing structure of the present invention.

Fig. 3 is a schematic view of an outside sealing structure of the present invention.

Fig. 4 is a schematic diagram of the outer left side view structure of the present invention.

In the figure: 1-central tapping pipe; 2-central discharge pipe bearing flange; 3-large bearing; 4-inner side bearing support; 5-discharging the material box; 6-discharging box bearing flange; 7-outer bearing support; 8-bearing outer ring sliding bearing seat; 9-outboard bearing; 10-bearing and central gas shaft flange; 11-a ring-shaped support plate; 12-reinforcing plate; 13-central gas axis.

Detailed Description

As shown in FIGS. 1 to 4, a central discharging sealing structure of a rotary dryer comprises a central discharging pipe 1, a discharging box 5 and a central air shaft 13.

A central discharging pipe bearing flange 2, a bearing and a central air shaft flange 10 are respectively arranged on the central discharging pipe 1; the inner side of the discharge box 5 is provided with a large bearing 3, and the large bearing 3 is respectively fixed on the central discharge pipe 1 through an inner side bearing support 4 and a central discharge pipe bearing flange 2; the outer side of the discharging box 5 is respectively provided with a discharging box bearing flange 6 and an outer side bearing support 7, and the outer side bearing support 7 is connected with a bearing outer ring sliding bearing seat 8; an outer side bearing 9 is arranged on the bearing outer ring sliding bearing seat 8, and the outer side bearing 9 is connected with a central air shaft flange 10; an annular supporting plate 11 is arranged outside the outer bearing support 7, and a reinforcing rib plate 12 is arranged between the annular supporting plate 11 and a central air shaft 13.

Wherein: the matching degree of the central discharging pipe bearing flange 2 and the spigot of the bearing and the central air shaft flange 10 is matched with the concentricity of the central discharging pipe 1. The central discharging pipe bearing flange 2 and the bearing and central air shaft flange 10 adopt an integral processing mode.

The outer side bearing support 7 and the bearing outer ring sliding bearing seat 8 are matched through a spigot and fastened through bolts, and have uniform concentricity in the circumferential direction.

The large bearing 3 matches the concentricity of the outer bearing 9.

The annular supporting plate 11 and the dryer cylinder are provided with inspection and repair holes.

Because the discharging box bearing flanges 6 on the two sides of the discharging box 5 are integrally processed and have good concentricity, a sealing cavity formed by the two parts has uniform clearance, and the sealing filler does not have eccentric wear.

The central tapping pipe 1 and the tapping box 5 have different thermal expansion values due to the temperature difference; the outer bearing 9 is a free end bearing, and a bearing outer ring sliding bearing seat 8 is adopted to ensure that the linear displacement caused by different expansion amounts is compensated.

Claims

1. The utility model provides a rotary dryer center ejection of compact seal structure, includes central discharging pipe (1), ejection of compact case (5) and central gas shaft (13), its characterized in that: a central discharging pipe bearing flange (2), a bearing and a central air shaft flange (10) are respectively arranged on the central discharging pipe (1); the inner side of the discharge box (5) is provided with a large bearing (3), and the large bearing (3) is fixed on the central discharge pipe (1) through an inner side bearing support (4) and the central discharge pipe bearing flange (2) respectively; a discharging box bearing flange (6) and an outer side bearing support (7) are respectively arranged on the outer side of the discharging box (5), and the outer side bearing support (7) is connected with a bearing outer ring sliding bearing seat (8); an outer side bearing (9) is arranged on the bearing outer ring sliding bearing seat (8), and the outer side bearing (9) is connected with the bearing and a central air shaft flange (10); an annular supporting plate (11) is arranged outside the outer side bearing support (7), and a reinforcing rib plate (12) is arranged between the annular supporting plate (11) and the central air shaft (13).

2. The rotary dryer central discharge seal structure of claim 1, wherein: the matching degree of the bearing flange (2) of the central discharging pipe and the spigot of the bearing and the central air shaft flange (10) is matched with the concentricity of the central discharging pipe (1).

3. The rotary dryer central discharge seal structure of claim 1, wherein: the outer side bearing support (7) and the bearing outer ring sliding bearing seat (8) are matched through a spigot and fastened through bolts, and have uniform concentricity in the circumferential direction.

4. The rotary dryer central discharge seal structure of claim 1, wherein: the large bearing (3) is matched with the outer bearing (9) in concentricity.

5. The rotary dryer central discharge seal structure of claim 1, wherein: and the annular supporting plate (11) and the dryer cylinder are provided with inspection and repair holes.