A sealing device for the hot air door shaft of a boiler coal mill

Abstract

The invention discloses a boiler coal mill hot air door shaft sealing device, comprising: a door shaft sleeve fixing seat, the door shaft sleeve fixing seat is sleeved on the door shaft; a wear-resistant sleeve, the wear-resistant sleeve is sleeved on the door shaft, and the bottom of the wear-resistant sleeve is embedded in the upper tube mouth of the door shaft sleeve fixing seat; an inner sealing sleeve, the inner sealing sleeve is sleeved on the top of the wear-resistant sleeve and is fixedly connected to the door shaft sleeve fixing seat, and a plurality of sealing rings are embedded at intervals on the outer peripheral wall of the inner sealing sleeve; an outer sealing sleeve, the top of the outer sealing sleeve is sleeved on the door shaft, and the bottom of the outer sealing sleeve is sleeved on the outside of the sealing ring; a tensioning assembly, the tensioning assembly is sleeved on the door shaft, the bottom end of the tensioning assembly is embedded in the upper tube mouth of the outer sealing sleeve, and is fixedly connected to the outer sealing sleeve; a labyrinth sealing structure is formed between the inner sealing sleeve, the sealing ring and the outer sealing sleeve, and the sealing effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of sealing devices, and more particularly to a hot air door shaft sealing device for a boiler coal mill. Background Art

[0002] At present, graphite packing is mostly used to seal the air duct door and door shaft of the coal mill. However, after the air duct door has been used for a period of time, due to frequent opening and closing and the high-temperature medium inside the air duct, the high temperature causes the water inside the graphite packing to evaporate and lose its elasticity, making the graphite packing at the door shaft prone to aging and deformation, shortening the service life of the graphite packing. As a result, a gap will be generated between the door shaft and the graphite packing. Under the action of the air duct pressure, the medium in the air duct overflows from the door shaft gap, resulting in air leakage and ash leakage.

[0003] Therefore, how to provide a boiler coal mill hot air door shaft sealing device with a long service life and good sealing effect is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides a boiler coal mill hot air door shaft sealing device with long service life and good sealing effect.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A hot air door shaft sealing device for a boiler coal mill, comprising:

[0007] A door shaft sleeve fixing seat, wherein the door shaft sleeve fixing seat is sleeved on the door shaft;

[0008] A wear-resistant sleeve, wherein the wear-resistant sleeve is sleeved on the door shaft, and the bottom of the wear-resistant sleeve is embedded in the upper sleeve opening of the door shaft sleeve fixing seat;

[0009] An inner sealing sleeve, which is sleeved on the top of the wear-resistant sleeve and fixedly connected to the door shaft sleeve fixing seat, and a plurality of sealing rings are embedded at intervals on the outer peripheral wall of the inner sealing sleeve;

[0010] An outer sealing sleeve, wherein the top of the outer sealing sleeve is sleeved on the door shaft, and the bottom of the outer sealing sleeve is sleeved on the outside of the sealing ring;

[0011] A tensioning assembly, wherein the tensioning assembly is sleeved on the door shaft, the bottom end of the tensioning assembly is embedded in the upper tube opening of the outer sealing sleeve, and the tensioning assembly is fixedly connected to the outer sealing sleeve;

[0012] Wherein, a labyrinth sealing structure is formed among the inner sealing sleeve, the sealing ring and the outer sealing sleeve.

[0013] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a boiler coal mill hot air door shaft sealing device, in which an outer sealing sleeve is expanded and connected to the door shaft through a tightening assembly, and rotates with the door shaft, and a plurality of sealing rings are arranged on the outside of the inner sealing sleeve. When the door shaft rotates, the outer sealing sleeve rotates relative to the inner sealing sleeve, and a labyrinth sealing structure is formed between the inner sealing sleeve, the sealing ring and the outer sealing sleeve, thereby playing a sealing role and having a good sealing effect.

[0014] Furthermore, a lap edge is provided inside the upper tube opening of the door shaft sleeve fixing seat, and the bottom end of the wear-resistant sleeve is inserted into the upper tube opening of the door shaft sleeve fixing seat and abuts against the lap edge.

[0015] The beneficial effect of adopting the above technical scheme is that the wear-resistant sleeve is easy to install, and the provision of the wear-resistant sleeve can prevent the door shaft sleeve fixing seat and the inner sealing sleeve from directly contacting the door shaft and causing wear. In later maintenance, only the wear-resistant sleeve needs to be replaced, and there is no need to replace the door shaft sleeve fixing seat and the inner sealing sleeve, thereby reducing maintenance costs.

[0016] Furthermore, a mounting groove is provided at the bottom end of the inner sealing sleeve, and the top of the door shaft sleeve fixing seat is inserted into the mounting groove and fixedly connected to the inner sealing sleeve by a first connecting bolt.

[0017] The beneficial effect of adopting the above technical solution is that the inner sealing sleeve is easy to install on the door shaft sleeve fixing seat.

[0018] Furthermore, the outer sealing sleeve includes: a first cylinder and a second cylinder, the first cylinder is sleeved on the door shaft, and the bottom of the tensioning assembly is embedded in the upper cylinder mouth of the first cylinder, the tensioning assembly is fixedly connected to the first cylinder, the inner side of the upper cylinder mouth of the second cylinder is integrally connected to the outer edge of the first cylinder, the second cylinder is sleeved on the outside of the sealing ring, and the labyrinth sealing structure is formed between the inner sealing sleeve, the sealing ring and the second cylinder.

[0019] Furthermore, the tensioning assembly comprises:

[0020] A tension sleeve, wherein the tension sleeve is sleeved on the door shaft, the bottom of the tension sleeve is embedded in the upper tube opening of the first cylinder, and the tension sleeve is fixedly connected to the top of the first cylinder;

[0021] A wedge-shaped expansion ring, which is sleeved on the door shaft and embedded in the tension sleeve;

[0022] A compression sleeve, the compression sleeve is located above the tensioning sleeve, is sleeved on the door shaft, and is fixedly connected to the tensioning sleeve. The bottom end of the compression sleeve is crimped with the top end of the tensioning sleeve and the top end of the wedge-shaped expansion ring.

[0023] The beneficial effect of adopting the above technical solution is that the wedge-shaped expansion ring is compressed by the compression sleeve to expand the wedge-shaped expansion ring, the wedge-shaped expansion ring compresses the expansion sleeve, the expansion sleeve compresses the upper cylinder, and then the outer sealing sleeve is expanded and fixed on the door shaft, and rotates with the door shaft.

[0024] Furthermore, the tension sleeve is fixedly connected to the top end of the first cylinder via a second connecting bolt, and the compression sleeve is fixedly connected to the top end of the tension sleeve via a third connecting bolt.

[0025] Furthermore, a tensioning boss is integrally formed in the middle of the bottom end of the tensioning sleeve, the tensioning boss is embedded in the upper tube opening of the first tube body, and the outer edge of the tensioning boss abuts against the inner edge of the upper tube opening of the first tube body.

[0026] The beneficial effect of adopting the above technical solution is that the outer sealing sleeve is expanded and fixed on the door shaft through the tightening boss.

[0027] Furthermore, the inner wall of the expansion sleeve is adapted in shape to the outer wall of the wedge-shaped expansion ring.

[0028] Furthermore, it also includes a lower pressure sleeve, which is arranged on the door shaft sleeve fixing seat and is fixedly connected to the bottom end of the second cylinder body through a fourth connecting bolt.

[0029] Furthermore, it also includes an upper cover plate, which is sleeved on the door shaft and located above the clamping sleeve, and the upper cover plate and the clamping sleeve are fixedly connected by a fifth connecting bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 The accompanying drawing is a schematic structural diagram of a boiler coal mill hot air door shaft sealing device provided by the present invention.

[0032] Figure 2 The attached picture is Figure 1 Schematic diagram of the enlarged structure of local A in the middle.

[0033] Figure 3 The accompanying drawing is a schematic structural diagram of the inner sealing sleeve.

[0034] Among them: 1-door shaft sleeve fixing seat, 101-lap edge, 2-wear-resistant sleeve, 3-inner sealing sleeve, 301-installation groove, 4-sealing ring, 5-outer sealing sleeve, 51-first cylinder, 52-second cylinder, 6-tensioning assembly, 61-tensioning sleeve, 611-tensioning boss, 62-wedge-shaped expansion ring, 63-pressure sleeve, 7-labyrinth sealing structure, 8-first connecting bolt, 9-second connecting bolt, 10-third connecting bolt, 11-lower pressure sleeve, 12-fourth connecting bolt, 13-upper cover plate, 14-fifth connecting bolt. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The embodiment of the present invention discloses a hot air door shaft sealing device for a boiler coal mill, comprising:

[0037] A door shaft sleeve fixing seat 1, wherein the door shaft sleeve fixing seat 1 is sleeved on the door shaft;

[0038] A wear-resistant sleeve 2, which is sleeved on the door shaft, and the bottom of the wear-resistant sleeve 2 is embedded in the upper sleeve opening of the door shaft sleeve fixing seat 1;

[0039] An inner sealing sleeve 3 is sleeved on the top of the wear-resistant sleeve 2 and fixedly connected to the door shaft sleeve fixing seat 1. A plurality of sealing rings 4 are embedded at intervals on the outer peripheral wall of the inner sealing sleeve 3. The sealing rings can be open rings.

[0040] An outer sealing sleeve 5, the top of which is sleeved on the door shaft, and the bottom of which is sleeved on the outside of the sealing ring 4;

[0041] A tensioning assembly 6, which is sleeved on the door shaft, and whose bottom end is embedded in the upper tube opening of the outer sealing sleeve 5, and the tensioning assembly 6 is fixedly connected to the outer sealing sleeve 5;

[0042] A labyrinth seal structure 7 is formed among the inner sealing sleeve 3 , the sealing ring 4 and the outer sealing sleeve 5 .

[0043] An overlapping edge 101 is arranged in the upper tube opening of the door shaft sleeve fixing seat 1 , and the bottom end of the wear-resistant sleeve 2 is inserted into the upper tube opening of the door shaft sleeve fixing seat 1 and abuts against the overlapping edge 101 .

[0044] A mounting groove 31 is provided at the bottom end of the inner sealing sleeve 3 , and the top of the door shaft sleeve fixing seat 1 is inserted into the mounting groove 301 and fixedly connected to the inner sealing sleeve 3 via a first connecting bolt 8 .

[0045] The outer sealing sleeve 5 includes: a first cylinder 51 and a second cylinder 52. The first cylinder 52 is sleeved on the door shaft, and the bottom of the tensioning assembly 6 is embedded in the upper cylinder mouth of the first cylinder 51. The tensioning assembly 6 is fixedly connected to the first cylinder 51. The inner side of the upper cylinder mouth of the second cylinder 52 is integrally connected to the outer edge of the first cylinder 51. The second cylinder 52 is sleeved on the outside of the sealing ring 4. A labyrinth sealing structure 7 is formed between the inner sealing sleeve 3, the sealing ring 4 and the second cylinder 52.

[0046] The tensioning assembly 6 comprises:

[0047] The tension sleeve 61 is sleeved on the door shaft, the bottom of the tension sleeve 61 is embedded in the upper tube opening of the first tube body 51, and the tension sleeve 61 is fixedly connected to the top of the first tube body 51;

[0048] A wedge-shaped expansion ring 62 is sleeved on the door shaft and embedded in the tension sleeve 61;

[0049] The compression sleeve 63 is located above the tensioning sleeve 61 , is sleeved on the door shaft, and is fixedly connected to the tensioning sleeve 61 . The bottom end of the compression sleeve 63 is crimped with the top end of the tensioning sleeve 61 and the top end of the wedge-shaped expansion ring 62 .

[0050] The tension sleeve 61 is fixedly connected to the top end of the first cylinder 51 via a second connecting bolt 9 , and the compression sleeve 63 is fixedly connected to the top end of the tension sleeve 61 via a third connecting bolt 10 .

[0051] A tensioning boss 611 is integrally formed at the middle of the bottom end of the tensioning sleeve 61 . The tensioning boss 611 is embedded in the upper tube opening of the first tube body 51 , and the outer edge of the tensioning boss 611 abuts against the inner edge of the upper tube opening of the first tube body 51 .

[0052] The inner wall of the expansion sleeve 61 is matched in shape with the outer wall of the wedge-shaped expansion ring 62 .

[0053] The boiler coal mill hot air door shaft sealing device also includes a lower pressure sleeve 11, which is sleeved on the door shaft sleeve fixing seat 1 and fixedly connected to the bottom end of the second cylinder 52 through a fourth connecting bolt 12.

[0054] The boiler coal mill hot air door shaft sealing device also includes an upper cover plate 13 , which is sleeved on the door shaft and located above the compression sleeve 63 . The upper cover plate 13 and the compression sleeve 63 are fixedly connected by a fifth connecting bolt 14 .

[0055] Sealing principle: The door shaft sleeve fixing seat in the hot air door shaft sealing device of the boiler mill is welded on the door shaft calliper and fixedly connected with the inner sealing sleeve. The outer sealing sleeve is fixed on the door shaft by the tensioning assembly and rotates with the door shaft. When the door shaft rotates, the outer sealing sleeve rotates compared with the inner sealing sleeve, and then a cut-off gap and an expansion cavity can be formed between the outer sealing sleeve, the sealing ring and the inner sealing sleeve, that is, a labyrinth sealing structure. When the sealed medium passes through the gap of the labyrinth, a throttling effect is generated to achieve the purpose of leakage prevention.

[0056] At the same time, all the parts in the device can be made of metal materials, such as stainless steel, which is resistant to high temperatures, has high strength and a long service life.

[0057] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0058] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot air door shaft sealing device for a boiler coal mill, characterized in that: include: A door shaft sleeve fixing seat (1), wherein the door shaft sleeve fixing seat (1) is sleeved on the door shaft; A wear-resistant sleeve (2), wherein the wear-resistant sleeve (2) is sleeved on the door shaft, and the bottom of the wear-resistant sleeve (2) is embedded in the upper sleeve opening of the door shaft sleeve fixing seat (1); An inner sealing sleeve (3), the inner sealing sleeve (3) being sleeved on the top of the wear-resistant sleeve (2) and fixedly connected to the door shaft sleeve fixing seat (1), and a plurality of sealing rings (4) being embedded at intervals on the outer peripheral wall of the inner sealing sleeve (3); An outer sealing sleeve (5), wherein the top of the outer sealing sleeve (5) is sleeved on the door shaft, and the bottom of the outer sealing sleeve (5) is sleeved on the outside of the sealing ring (4); A tensioning assembly (6), wherein the tensioning assembly (6) is sleeved on the door shaft, and the bottom end of the tensioning assembly (6) is embedded in the upper tube opening of the outer sealing sleeve (5), and the tensioning assembly (6) is fixedly connected to the outer sealing sleeve (5); Wherein, a labyrinth sealing structure (7) is formed between the inner sealing sleeve (3), the sealing ring (4) and the outer sealing sleeve (5); An overlap edge (101) is provided in the upper tube opening of the door shaft sleeve fixing seat (1), and the bottom end of the wear-resistant sleeve (2) is inserted into the upper tube opening of the door shaft sleeve fixing seat (1) and abuts against the overlap edge (101); The bottom end of the inner sealing sleeve (3) is provided with a mounting groove (301), the top of the door shaft sleeve fixing seat (1) is inserted into the mounting groove (301), and is fixedly connected to the inner sealing sleeve (3) via a first connecting bolt (8).

2. A boiler coal mill hot air door shaft sealing device according to claim 1, characterized in that: The outer sealing sleeve (5) comprises: a first cylinder (51) and a second cylinder (52), the first cylinder (51) is sleeved on the door shaft, and the bottom of the tensioning assembly (6) is embedded in the upper cylinder mouth of the first cylinder (51), the tensioning assembly (6) is fixedly connected to the first cylinder (51), the inner side of the upper cylinder mouth of the second cylinder (52) is integrally connected to the outer edge of the first cylinder (51), the second cylinder (52) is sleeved on the outside of the sealing ring (4), and the labyrinth sealing structure (7) is formed between the inner sealing sleeve (3), the sealing ring (4) and the second cylinder (52).

3. A boiler coal mill hot air door shaft sealing device according to claim 2, characterized in that: The tensioning assembly (6) comprises: A tension sleeve (61), the tension sleeve (61) is sleeved on the door shaft, the bottom of the tension sleeve (61) is embedded in the upper tube opening of the first tube body (51), and the tension sleeve (61) is fixedly connected to the top of the first tube body (51); A wedge-shaped expansion ring (62), the wedge-shaped expansion ring (62) is sleeved on the door shaft and embedded in the tension sleeve (61); A compression sleeve (63), the compression sleeve (63) is located above the tension sleeve (61), is sleeved on the door shaft, and is fixedly connected to the tension sleeve (61), and the bottom end of the compression sleeve (63) is crimped with the top end of the tension sleeve (61) and the top end of the wedge-shaped expansion ring (62).

4. A boiler coal mill hot air door shaft sealing device according to claim 3, characterized in that: The tension sleeve (61) is fixedly connected to the top end of the first cylinder (51) via a second connecting bolt (9), and the compression sleeve (63) is fixedly connected to the top end of the tension sleeve (61) via a third connecting bolt (10).

5. The hot air door shaft sealing device for a coal mill of a boiler according to claim 3, characterized in that: A tensioning boss (611) is integrally formed in the middle of the bottom end of the tensioning sleeve (61), and the tensioning boss (611) is embedded in the upper tube opening of the first tube body (51), and the outer edge of the tensioning boss (611) abuts against the inner edge of the upper tube opening of the first tube body (51).

6. A boiler coal mill hot air door shaft sealing device according to claim 3, characterized in that: The inner wall of the expansion sleeve (61) is adapted in shape to the outer wall of the wedge-shaped expansion ring (62).

7. A hot air door shaft sealing device for a coal mill of a boiler according to any one of claims 2 to 6, characterized in that: It also comprises a lower pressing sleeve (11), which is sleeved on the door shaft sleeve fixing seat (1) and fixedly connected to the bottom end of the second cylinder (52) via a fourth connecting bolt (12).

8. A boiler coal mill hot air door shaft sealing device according to any one of claims 3 to 6, characterized in that: It also comprises an upper cover plate (13), wherein the upper cover plate (13) is sleeved on the door shaft and is located above the compression sleeve (63), and the upper cover plate (13) and the compression sleeve (63) are fixedly connected via a fifth connecting bolt (14).

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