Sealing structure for air door shaft end of air duct of coal mill

Abstract

The utility model relates to the technical field of thermal mechanical equipment in the electric power industry, and discloses a coal mill air duct air door shaft end sealing structure which comprises a shaft end, a sealing structure is arranged outside the shaft end, the sealing structure comprises a bottom cover, the bottom cover is externally arranged on the shaft end in a sleeving mode, a lower sealing cavity is installed on the bottom cover in a fastening mode through a bolt, and the lower sealing cavity is provided with an upper sealing cavity. And the lower sealing cavity is fixedly provided with an upper sealing cavity through a bolt. According to the utility model, the shaft end sealing material is externally arranged; the first layer of filler adopts a ceramic fiber sealing ring which is high in strength, good in impact resistance and high-temperature-resistant; the second layer is a floating copper sleeve; the third layer is a sealed cooling device (matched with a sealed hose); the fourth layer adopts a sulfonated graphite metal fiber sealing ring; and the fifth layer adopts an elastic composite self-lubricating solid sealing ring, and the sealing ring has excellent sealing, lubricating and rebound resilience, so that the sealing effect is achieved, and the effects of reducing the jamming condition of the air door and reducing the sealing leakage of the air door are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal mechanical equipment in the electric power industry, in particular to a shaft end sealing structure of a damper of a coal mill air duct. Background Art

[0002] The hot primary air of the coal mill in the boiler of a thermal power plant carries a lot of dust. The shaft end seal of the air duct damper is sealed with a copper sleeve of the door shaft and a graphite packing. Due to the gap between the door shaft and the copper sleeve, dust is easily trapped in the gap after long-term operation, causing the damper switch to be stuck. At the same time, the hot air is easy to leak out after the packing is worn. For this reason, we provide a shaft end seal structure for the damper of the coal mill air duct, a stuffing box with a reasonable shaft end seal design, a metal pressure seal, and a floating sleeve structure, so as to reduce the occurrence of damper jams and reduce the leakage of damper seals. Utility Model Content

[0003] The utility model aims to provide a shaft end sealing structure of a damper of a coal mill air duct to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal mill air duct damper shaft end sealing structure, including a shaft end, the shaft end is externally provided with a sealing structure, the sealing structure includes a bottom cover, the bottom cover is externally sleeved on the shaft end, the bottom cover is fastened with a lower sealing cavity by bolts, the lower sealing cavity is fastened with an upper sealing cavity by bolts, the lower sealing cavity and the upper sealing cavity are both externally sleeved on the shaft end, the upper sealing cavity is provided with a pressure cover, and the pressure cover is externally sleeved on the shaft end.

[0005] Preferably, a multi-layer sealing composite filler is built inside the lower sealing cavity and the upper sealing cavity.

[0006] Preferably, the multi-layer sealing composite filler located inside the lower sealing cavity includes a ceramic fiber sealing ring and a floating copper sleeve.

[0007] Preferably, the multi-layer sealing composite filler located inside the upper sealing cavity includes a sealing cooling device, a sulfonated graphite metal fiber sealing ring, and an elastic composite self-lubricating solid sealing ring.

[0008] Preferably, the ceramic fiber sealing ring is sleeved on the shaft end, and the ceramic fiber sealing ring is made of a material with high strength, good impact resistance and high temperature resistance.

[0009] Preferably, the floating copper sleeve is mounted on the shaft end and rotates relative to the shaft.

[0010] Preferably, the sealed cooling device is provided with a sealed hose, and a sealed air interface is provided at the bottom of the sealed cooling device.

[0011] Preferably, the sulfonated graphite metal fiber sealing ring and the elastic composite self-lubricating solid sealing ring are both sleeved on the shaft end.

[0012] Preferably, the gland is fastened to the upper sealing cavity by long bolts and nuts, so that the sealing ring is evenly stressed in the radial and axial directions and is tightly sealed with the shaft, and there is no situation in which the damper is stuck due to excessive sealing force or loose sealing that causes dust to enter and accumulate.

[0013] The utility model provides a shaft end sealing structure for a wind door of a coal mill air duct, which has the following beneficial effects:

[0014] (1) The utility model adopts external shaft end sealing materials: the first layer of filler adopts a ceramic fiber sealing ring with high strength, good impact resistance and high temperature resistance; the second layer is a floating copper sleeve; the third layer is a sealing cooling device (equipped with a sealing hose); the fourth layer adopts a sulfonated graphite metal fiber sealing ring; the fifth layer adopts an elastic composite self-lubricating solid sealing ring, which has excellent sealing, lubrication and resilience, and achieves a sealing effect, so as to reduce the occurrence of damper jamming and reduce the leakage of damper seal.

[0015] (2) The utility model ensures the sealing effect through multi-layer sealing composite filling; the metal sleeve of the sealing ring adopts a split structure, which is tightened together with the pressure cover, so that the sealing ring is evenly stressed in the radial and axial directions, and is tightly sealed with the shaft, and there is no situation where the air door is stuck due to excessive sealing force or loose sealing and dust accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the shaft end sealing structure of the utility model.

[0017] In the figure: 1 bottom cover, 2 lower sealing cavity, 3 ceramic fiber sealing ring, 4 floating copper sleeve, 5 sealing cooling device, 6 sulfonated graphite metal fiber sealing ring, 7 elastic composite self-lubricating solid sealing ring, 8 upper sealing cavity, 9 pressure cover, 10 sealing air interface. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The preferred embodiment of the coal mill air duct damper shaft end sealing structure provided by the utility model is as follows Figure 1 As shown: the shaft end sealing structure of the air duct damper of the coal mill includes a shaft end, a sealing structure is arranged outside the shaft end, the sealing structure includes a bottom cover 1, the bottom cover 1 is externally sleeved on the shaft end, the bottom cover 1 is fastened with a lower sealing cavity 2 by bolts, the lower sealing cavity 2 is fastened with an upper sealing cavity 8 by bolts, the lower sealing cavity 2 and the upper sealing cavity 8 are both externally sleeved on the shaft end, and the upper sealing cavity 8 is provided with a pressure cover 9, which is externally sleeved on the shaft end;

[0021] The lower sealing cavity 2 and the upper sealing cavity 8 are both internally provided with multi-layer sealing composite fillers. The multi-layer sealing composite fillers located inside the lower sealing cavity 2 include a ceramic fiber sealing ring 3 and a floating copper sleeve 4. The multi-layer sealing composite fillers located inside the upper sealing cavity 8 include a sealing cooling device 5, a sulfonated graphite metal fiber sealing ring 6, and an elastic composite self-lubricating solid sealing ring 7.

[0022] The ceramic fiber sealing ring 3 is sleeved on the shaft end. The ceramic fiber sealing ring 3 is made of a material with high strength, good impact resistance and high temperature resistance (>450℃);

[0023] The floating copper sleeve 4 is sleeved on the shaft end and rotates relative to the shaft;

[0024] The sealed cooling device 5 is equipped with a sealed hose, and a sealed air interface 10 is provided at the bottom of the sealed cooling device 5; the external shaft end seal is designed with a sealed air duct, which is supplied with compressed air to seal the hot primary air from leaking out.

[0025] The sulfonated graphite metal fiber sealing ring 6 and the elastic composite self-lubricating solid sealing ring 7 are both sleeved on the shaft end;

[0026] The pressure cover 9 is fastened to the upper sealing cavity 8 by long bolts and nuts, so that the sealing ring is evenly stressed in the radial and axial directions and is tightly sealed with the shaft, and there will be no situation where the air door is stuck due to excessive sealing force or loose sealing and dust accumulation.

[0027] Working principle: When in use, the bottom cover 1, the lower sealing cavity 2, the upper sealing cavity 8 and the pressure cover 9 are pre-placed on the outer wall of the shaft end, wherein the ceramic fiber sealing ring 3 and the floating copper sleeve 4 inside the lower sealing cavity 2, the sealing cooling device 5, the sulfonated graphite metal fiber sealing ring 6 and the elastic composite self-lubricating solid sealing ring 7 inside the upper sealing cavity 8 are arranged correspondingly, through the external shaft end sealing material, the first layer of filler adopts a ceramic fiber sealing ring with high strength, good impact resistance and high temperature resistance; the second layer is a floating copper sleeve; the third layer is a sealing cooling device 5, the sulfonated graphite metal fiber sealing ring 6 and the elastic composite self-lubricating solid sealing ring 7 are arranged correspondingly, and the external shaft end sealing material is used. The cooling device is sealed with a sealed air duct, which is supplied by compressed air to seal the hot primary air from leaking out; the fourth layer adopts sulfonated graphite metal fiber sealing ring; the fifth layer adopts elastic composite self-lubricating solid sealing ring, which has excellent sealing, lubrication and resilience, achieving the sealing effect, so as to reduce the occurrence of damper jamming and reduce the purpose of damper seal leakage, and solve the problem that there is a gap between the door shaft and the copper sleeve, and dust is easily trapped in the gap after long-term operation, causing the damper switch to jam, and hot air is easily leaked after the packing is worn.

[0028] In summary, the device has a simple design structure, is easy to install, has no electric device, has high reliability, and has no subsequent maintenance costs, which greatly reduces the investment cost of production equipment; reduces the occurrence of damper jamming, ensures the reliable operation of the coal mill, reduces damper seal leakage, and improves the level of civilized production on site.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A coal mill air duct damper shaft end sealing structure, including a shaft end, characterized in that: The shaft end is provided with a sealing structure externally, the sealing structure comprising a bottom cover (1), the bottom cover (1) being externally sleeved on the shaft end, the bottom cover (1) being fastened with a lower sealing cavity (2) by bolts, the lower sealing cavity (2) being fastened with an upper sealing cavity (8) by bolts, the lower sealing cavity (2) and the upper sealing cavity (8) being both externally sleeved on the shaft end, the upper sealing cavity (8) being provided with a pressure cover (9), the pressure cover (9) being externally sleeved on the shaft end.

2. The coal mill air duct damper shaft end sealing structure according to claim 1 is characterized in that: The lower sealed cavity (2) and the upper sealed cavity (8) are both internally provided with multi-layered sealing composite fillers.

3. The coal mill air duct damper shaft end sealing structure according to claim 1, characterized in that: The multi-layer sealing composite filler located inside the lower sealing cavity (2) comprises a ceramic fiber sealing ring (3) and a floating copper sleeve (4).

4. The coal mill air duct damper shaft end sealing structure according to claim 1, characterized in that: The multi-layer sealing composite filler located inside the upper sealing cavity (8) comprises a sealing cooling device (5), a sulfonated graphite metal fiber sealing ring (6), and an elastic composite self-lubricating solid sealing ring (7).

5. The coal mill air duct damper shaft end sealing structure according to claim 3, characterized in that: The ceramic fiber sealing ring (3) is sleeved on the shaft end, and the ceramic fiber sealing ring (3) is made of a material with high strength, good impact resistance and high temperature resistance.

6. The coal mill air duct damper shaft end sealing structure according to claim 3, characterized in that: The floating copper sleeve (4) is sleeved on the shaft end and rotates relative to the shaft.

7. The coal mill air duct damper shaft end sealing structure according to claim 4, characterized in that: The sealed cooling device (5) is equipped with a sealed hose, and a sealed air interface (10) is provided at the bottom of the sealed cooling device (5).

8. The coal mill air duct damper shaft end sealing structure according to claim 4, characterized in that: The sulfonated graphite metal fiber sealing ring (6) and the elastic composite self-lubricating solid sealing ring (7) are both sleeved on the shaft end.

9. The coal mill air duct damper shaft end sealing structure according to claim 1, characterized in that: The gland (9) is fastened to the upper sealing cavity (8) by means of long bolts and nuts, so that the sealing ring is evenly stressed in the radial and axial directions and is tightly sealed with the shaft, and the damper is not stuck due to excessive sealing force or loose sealing and dust accumulation.

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