Shaft hole sealing device for flap valve of preheater

Abstract

The utility model provides a preheater flap valve shaft hole sealing device which is characterized by comprising a flap valve outer shell, a protective shell welded to a shaft hole of the flap valve outer shell, a shaft rod and a sealing assembly. The gap between the protective shell and the shaft rod is larger than the gap between the shaft hole of the original shell; the sealing assembly comprises three graphite packings with the thickness of 12 mm, the space between the protective shell and the shaft rod is sequentially filled with the graphite packings, and the graphite packings are limited and fixed through an end face baffle. The baffle is pressed tightly through screws and nuts which are evenly distributed on the periphery of the baffle, and adjustable sealing press fit is achieved. Compared with a traditional single-layer 3mm asbestos plate sealing structure, the sealing service life is prolonged by more than three times by enlarging the space of the sealing cavity and arranging multiple layers of graphite packing, meanwhile, the gap between the baffle and the shaft rod is reduced, and the problem of air leakage at the shaft end is effectively solved. The device is simple in structure and particularly suitable for long-term stable sealing of the shaft end of the flap valve under the high-temperature working condition.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, and in particular to a sealing device for the shaft hole of a preheater flap valve. Background Technology

[0002] In cement kiln production systems, flap valves are installed on the feed pipes of each stage of the preheater, with their core functions being material feeding and airlocking. In existing technologies, 3mm thick asbestos boards are typically used as sealing materials at the flap valve shaft holes. However, due to the frequent movement of the flap valve shaft, the asbestos boards are prone to mechanical wear and failure, leading to external air leakage at the shaft holes. This leakage not only increases system energy consumption but also causes internal crust buildup, resulting in frequent equipment failures. Furthermore, in existing designs, the gap between the outermost fixing plate and the shaft is only 3mm, further exacerbating the leakage problem. Although existing technologies attempt to achieve sealing through asbestos board sealing and the design of the fixing plate gap, their material durability and structural rationality have significant shortcomings. An optimized solution is urgently needed that can adapt to the dynamic movement of the shaft while significantly reducing the risk of air leakage. Utility Model Content

[0003] The purpose of this invention is to provide a sealing device for the shaft hole of a preheater flap valve to solve the air leakage problem in the prior art.

[0004] This utility model is achieved by the following technical solution: a sealing device for the shaft hole of a preheater flap valve, characterized in that it includes a flap valve outer shell, a protective shell, a baffle, a shaft, and graphite packing. The protective shell is disposed at the connection hole between the flap valve outer shell and the shaft, the shaft is inserted into the protective shell, the graphite packing is filled between the protective shell and the shaft, and the baffle is disposed on the end face of the protective shell, thereby confining the graphite packing within the protective shell.

[0005] Furthermore, the protective shell is welded to the outer shell of the flap valve.

[0006] Furthermore, there are three graphite packings, which are sequentially filled between the protective shell and the shaft.

[0007] Furthermore, the baffle is connected to the outer casing of the flap valve via a screw and nut.

[0008] Furthermore, the outer side of the protective shell is provided with several screws, and the baffle is provided with multiple holes that cooperate with the screws. The screws are inserted into the corresponding holes on the baffle and tightened by nuts to fix the baffle.

[0009] Furthermore, the screw is welded to the outer casing of the flap valve.

[0010] Furthermore, the thickness of the graphite packing is 12 mm.

[0011] The preheater flap valve shaft hole sealing device described in this utility model has the following advantages:

[0012] The protective cover is filled with three layers of 12mm graphite packing instead of the traditional single-layer asbestos board. Graphite packing has excellent wear resistance, self-lubrication and high-temperature stability. After being tightly filled, it forms a multi-level dynamic sealing interface, which increases the sealing life by more than 3 times compared with asbestos board, and significantly reduces maintenance frequency and cost. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a sealing device for the shaft hole of a preheater flap valve;

[0015] In the diagram, 1-valve housing, 2-protective shell, 3-baffle, 4-shaft, 5-graphite packing, 6-screw, 7-nut. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a sealing device for the shaft hole of a preheater flap valve includes a flap valve housing 1, a protective shell 2, a baffle 3, a shaft 4, and graphite packing 5. The protective shell 2 is welded to the connection hole between the flap valve housing 1 and the shaft 4. The shaft 4 is inserted into the protective shell 2, and the graphite packing 5 fills the space between the protective shell 2 and the shaft 4. The baffle 3 is disposed on the end face of the protective shell 2, and the graphite packing 5 is confined within the protective shell 2 by the baffle 3.

[0019] There are three graphite packings 5, which are sequentially filled between the protective shell 2 and the shaft 4. Since the gap between the protective shell 2 and the shaft 4 is larger than the gap between the flap valve outer shell 1 and the shaft 4, thicker graphite packings 5 ​​can be inserted to provide better sealing and support.

[0020] Several screws 6 are provided on the outer side of the protective shell 2. The screws 6 are welded to the outer shell 1 of the flap valve. The baffle 3 is provided with multiple holes that cooperate with the screws 6. The screws 6 are inserted into the corresponding holes on the baffle 3 and tightened by nuts 7 to fix the baffle 3.

[0021] The original asbestos board between the shaft 4 and the flap valve housing 1 was 3mm thick. Because the shaft 4 moves frequently, the asbestos board was easily damaged, leading to air leakage. Therefore, three layers of 12mm thick graphite packing 5 were added between the protective cover 2 and the shaft 4, providing a good seal. Furthermore, the sealing effect of the three layers of graphite packing 3 is more than three times longer than that of a single layer of asbestos board.

[0022] Since the asbestos board between the original shaft 4 and the flap valve housing 1 has been removed, the gap between the baffle 3 and the shaft 4 can be further reduced, thereby reducing air leakage caused by excessive gap.

[0023] The above embodiments describe the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Modifications and variations made by those skilled in the art without departing from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A preheater flapper valve shaft bore seal apparatus, characterized by, The application relates to a flashboard valve outer shell (1), a protective shell (2), a baffle (3), a shaft (4) and graphite packing (5), the protective shell (2) is arranged at the connecting hole of the flashboard valve outer shell (1) and the shaft (4), the shaft (4) is inserted into the protective shell (2), the graphite packing (5) is filled between the protective shell (2) and the shaft (4), the baffle (3) is arranged at the end face of the protective shell (2), and the graphite packing (5) is limited in the protective shell (2) through the baffle (3).

2. A preheater flap valve shaft hole sealing device according to claim 1, characterized in that, The protective shell (2) is welded with the flashboard valve outer shell (1).

3. A preheater flap valve shaft hole sealing device according to claim 1, characterized in that, The graphite packing (5) is three in total and is sequentially filled between the protective shell (2) and the shaft (4).

4. A preheater flap valve shaft bore seal apparatus as defined in claim 1, wherein, The baffle (3) is connected with the flashboard valve outer shell (1) through a screw nut.

5. A preheater flap valve shaft bore seal apparatus as defined in claim 4, wherein, The protective shell (2) is externally provided with a plurality of screws (6), the baffle (3) is provided with a plurality of holes matched with the screws (6), the screws (6) are inserted into the corresponding holes of the baffle (3) and are fastened through nuts (7), and the fixation of the baffle (3) is realized.

6. A preheater flap valve shaft bore seal apparatus as defined in claim 5, wherein, The screw (6) is welded with the flashboard valve outer shell (1).

7. A preheater flap valve shaft bore seal apparatus as defined in claim 1 wherein, The thickness of the graphite packing (5) is 12 mm.

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