A rotary dryer center discharge sealing structure

Abstract

The present invention relates to a central discharge sealing structure for a rotary dryer, comprising a central discharge pipe, a discharge box, and a central air shaft, characterized in that: the central discharge pipe is provided with a central discharge pipe bearing flange, a bearing, and a central air shaft flange; the inner side of the discharge box is provided with a large bearing, which is fixed to the central discharge pipe via an inner bearing bracket and the central discharge pipe bearing flange; the outer side of the discharge box is provided with a discharge box bearing flange and an outer bearing bracket, the outer bearing bracket being connected to a bearing outer ring sliding bearing seat; the bearing outer ring sliding bearing seat is provided with an outer bearing, the outer bearing being connected to the bearing and the central air shaft flange; the outer side of the outer bearing bracket is provided with an annular support plate, and a reinforcing rib plate is provided between the annular support plate and the central air shaft. The present invention has a compact structure, low manufacturing and modification costs, is stable, leak-free, and is convenient and quick to maintain.

Description

Technical Field

[0001] The invention relates to a sealing structure, in particular to a central discharge sealing structure of a rotary dryer. Background Art

[0002] With the rapid development of the chemical and coal chemical industries, the demand for rotary dryers is increasing due to the high production capacity and the need to meet environmental protection requirements of energy conservation and emission reduction. As the size of the equipment increases, the diameter of the central discharge pipe increases, the diameter of the sealing surface increases, and the friction line speed increases. As a result, the discharge seal of the existing structure often suffers from excessive wear and tear, resulting in material leakage.

[0003] The existing discharge seal is a cantilever support structure, which has the following disadvantages:

[0004] (1) During the installation of the discharge box, whether it is suspended by springs or supported by springs, it cannot ensure that the outer diameter of the stuffing box of the discharge box is concentric with the discharge sealing sleeve, which will inevitably cause eccentric wear of the sealing packing due to eccentricity;

[0005] (2) The cantilever structure causes severe friction and high heat generation on the friction surface away from the supporting bearing, and shortens the life of the sealing packing;

[0006] (3) Due to the wear of the packing, the metal hole ring is dislocated, causing the metal hole ring to contact the friction surface of the rotating seal, which in turn causes metal scratches, damages the sealing friction surface, generates a lot of heat, and burns the packing;

[0007] (4) Due to the wear of the sealing packing at the sealing point, material leakage occurs shortly after operation;

[0008] ⑸ Due to friction and the vibration of the center tube itself, the cantilever structure causes large vibration of the discharge box, which reduces the life of the pipeline connected to the discharge box. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a stable and leak-free central discharge sealing structure for a rotary dryer.

[0010] In order to solve the above problems, the present invention provides a central discharge sealing structure of a rotary dryer, comprising a central discharge pipe, a discharge box and a central air shaft, and is characterized in that: the central discharge pipe is respectively provided with a central discharge pipe bearing flange, a bearing and a central air shaft flange; a large bearing is provided on the inner side of the discharge box, and the large bearing is fixed to the central discharge pipe through an inner bearing bracket and the central discharge pipe bearing flange; a discharge box bearing flange and an outer bearing bracket are respectively provided on the outer side of the discharge box, and the outer bearing bracket is connected with a bearing outer ring sliding bearing seat; an outer bearing is provided on the bearing outer ring sliding bearing seat, and the outer bearing is connected to the bearing and the central air shaft flange; an annular support plate is provided on the outside of the outer bearing bracket, and a reinforcing rib plate is provided between the annular support plate and the central air shaft.

[0011] The fit between the center discharge pipe bearing flange, the bearing and the center air shaft flange is matched with the concentricity of the center discharge pipe.

[0012] The outer bearing bracket and the bearing outer ring sliding bearing seat are matched with each other and fastened with bolts, and have uniform concentricity in the circumferential direction.

[0013] The concentricity of the large bearing is matched to that of the outer bearing.

[0014] Inspection holes are provided on the annular support plate and the dryer cylinder.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention is respectively provided with a center discharge pipe bearing flange, a bearing and a center air shaft flange on the center discharge pipe, and adopts a two-end support method to stably support the discharge box on the center discharge pipe. The bearing at one end is a fixed end bearing, and the bearing at the other end is a sliding end. In order to ensure that the thermal expansion of the discharge box and the center air shaft is not synchronized, the sliding end adopts a bearing seat with a sliding outer ring to ensure that the thermal expansion of the two is free, thereby ensuring good stability and avoiding scratches between the metal hole ring and the rotating friction surface of the center pipe.

[0017] 2. In the present invention, an annular support plate is provided on the outside of the outer bearing bracket. Inspection holes are provided on the annular support plate and the dryer cylinder. Under the premise of ensuring strength, it is convenient to observe whether the outer seal of the discharge box is leaking, and it is convenient for workers to adjust the tightness of the packing cover bolts.

[0018] 3. The present invention adopts two-end support to fundamentally solve the problem that the discharge box and the center discharge pipe are not concentric due to the previous cantilever support, which causes the rotating center discharge pipe sealing friction surface and the sealing filler inside the discharge box to be eccentric, resulting in serious wear of the filler and high heat generation. The metal hole ring is deformed due to filler wear, resulting in metal friction with the friction sealing surface, generating huge heat, burning the filler, and finally the seal fails and causes material leakage.

[0019] 4. The present invention uses bearing connection to make the discharging box easy to install and have high installation accuracy, ensuring that the gap between the sealing cavity formed with the central discharging pipe is uniform and the concentricity is high.

[0020] 5. The present invention has a compact structure, low manufacturing and modification costs, and is easy and quick to maintain, while maintaining the same sealing form as the existing arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the inner sealing structure of the present invention.

[0024] Figure 3 It is a schematic diagram of the outer sealing structure of the present invention.

[0025] Figure 4 It is a schematic diagram of the outer left side structure of the present invention.

[0026] In the figure: 1-center discharge pipe; 2-center discharge pipe bearing flange; 3-large bearing; 4-inner bearing bracket; 5-discharge box; 6-discharge box bearing flange; 7-outer bearing bracket; 8-bearing outer ring sliding bearing seat; 9-outer bearing; 10-bearing and center air shaft flange; 11-annular support plate; 12-reinforcement rib plate; 13-center air shaft. DETAILED DESCRIPTION

[0027] like Figures 1 to 4 As shown, a central discharge sealing structure of a rotary dryer includes a central discharge pipe 1, a discharge box 5 and a central air shaft 13.

[0028] The center discharge pipe 1 is respectively provided with a center discharge pipe bearing flange 2 and a bearing and center air shaft flange 10; a large bearing 3 is provided on the inner side of the discharge box 5, and the large bearing 3 is fixed on the center discharge pipe 1 through the inner bearing bracket 4 and the center discharge pipe bearing flange 2 respectively; a discharge box bearing flange 6 and an outer bearing bracket 7 are respectively provided on the outer side of the discharge box 5, and the outer bearing bracket 7 is connected to the bearing outer ring sliding bearing seat 8; an outer bearing 9 is provided on the bearing outer ring sliding bearing seat 8, and the outer bearing 9 is connected to the bearing and center air shaft flange 10; an annular support plate 11 is provided on the outside of the outer bearing bracket 7, and a reinforcing rib plate 12 is provided between the annular support plate 11 and the center air shaft 13.

[0029] The fit between the center discharge pipe bearing flange 2 and the bearing and center air shaft flange 10 is consistent with the concentricity of the center discharge pipe 1. The center discharge pipe bearing flange 2 and the bearing and center air shaft flange 10 are processed as a whole.

[0030] The outer bearing bracket 7 and the bearing outer ring sliding bearing seat 8 are fitted with stoppers and fastened with bolts, and have uniform concentricity in the circumferential direction.

[0031] The concentricity of the large bearing 3 and the outer bearing 9 is matched.

[0032] Inspection holes are provided on the annular support plate 11 and the dryer cylinder.

[0033] Since the discharge box bearing flanges 6 on both sides of the discharge box 5 are also integrally machined and have good concentricity, the sealing cavity formed by the two components has a uniform gap, and there is no eccentric wear of the sealing filler therein.

[0034] Since there is a temperature difference between the central discharge pipe 1 and the discharge box 5, there are different thermal expansion amounts; the outer bearing 9 is a free-end bearing, and a bearing outer ring sliding bearing seat 8 is used to ensure compensation for the linear displacement caused by the different expansion amounts.

Claims

1. A rotary dryer central discharge sealing structure, comprising a central discharge pipe (1), a discharge box (5) and a central air shaft (13), characterized in that: The central discharge pipe (1) is provided with a central discharge pipe bearing flange (2), a bearing and a central air shaft flange (10); a large bearing (3) is provided on the inner side of the discharge box (5), and the large bearing (3) is fixed to the central discharge pipe (1) through an inner bearing bracket (4) and the central discharge pipe bearing flange (2); a discharge box bearing flange (6) and an outer bearing bracket (7) are provided on the outer side of the discharge box (5), and the outer bearing bracket (7) is connected to a bearing outer ring sliding bearing seat (8); an outer bearing (9) is provided on the bearing outer ring sliding bearing seat (8) The outer bearing (9) is connected to the bearing and central air shaft flange (10); an annular support plate (11) is provided on the outside of the outer bearing bracket (7), and a reinforcing rib plate (12) is provided between the annular support plate (11) and the central air shaft (13); the stopper fit between the central discharge pipe bearing flange (2) and the bearing and central air shaft flange (10) matches the concentricity of the central discharge pipe (1); the outer bearing bracket (7) and the bearing outer ring sliding bearing seat (8) are stopper-fitted and bolt-fastened, and have uniform concentricity in the circumferential direction.

2. The central discharge sealing structure of a rotary dryer according to claim 1, characterized in that: The concentricity of the large bearing (3) and the outer bearing (9) is matched.

3. The central discharge sealing structure of a rotary dryer according to claim 1, characterized in that: Inspection holes are provided on the annular support plate (11) and the dryer cylinder.

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