Sealing device for shaft end of hot primary air regulating valve of coal mill
By designing a coal mill hot primary airtender door shaft end sealing device with seat sleeve, open disc, packing cover and packing box, the problems of poor sealing at the shaft end and easy damage to the packing are solved, and higher sealing and fault tolerance are achieved.
Patent Information
- Application Number
- CN202421230989.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The sealing device of the shaft end of the coal mill hot primary air conditioner of the door is easily damaged during long-term rotation, resulting in the problem of bearing locking and hot air leakage.
A shaft end sealing device is designed, using components such as a seat sleeve, an open disc, a packing cover and a packing box. It is fixedly connected by a screw, and a plurality of first packings and second packings are set up, and a packing press ring is installed outside the packing box to enhance sealing and protect the packing.
It effectively reduces air leakage at the shaft end, protects the pack from fly ash, ensures the normal operation of the bearing, and improves sealing and fault tolerance.
Smart Images
Figure CN222798283U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal mills, in particular to a shaft end sealing device for a hot primary air regulating door of a coal mill. Background Art
[0002] At present, in thermal power plants, the hot primary air regulating doors of coal mills are mostly adjustable damper doors. The shaft end of this regulating door is sealed by packing, and the rotation of the door shaft is supported by bearings. The temperature of the hot primary air is high, and the hot air carries fly ash. The regulating door will damage the packing during long-term back-and-forth rotation. Once the packing is damaged, the unit cannot be replaced in time during operation, and the hot air will blow directly on the bearing, and then blow the fly ash into the bearing. Under high temperature baking, the grease in the bearing and the fly ash mix, causing the bearing to lock, which leads to the failure of the hot primary air regulating door switch. Utility Model Content
[0003] The technical problem to be solved by the utility model is to study a coal mill hot primary air regulating door shaft end sealing device to enhance the sealing performance and prevent the packing from being damaged, thereby avoiding the door shaft air leakage and bearing locking.
[0004] The technical solution of the utility model to solve the above technical problems is as follows:
[0005] A coal mill hot primary air regulating valve shaft end sealing device, the shaft end is provided with a seat sleeve, an open disc and a packing gland at intervals along the extension direction, the open disc and the packing gland are fixedly connected by screws, a packing box is provided on the shaft end between the open disc and the packing gland, a plurality of first packings are provided in the packing box, two packing pressure rings are used at both sides of the packing box to respectively abut against the inner disk surface of the open disc and the inner cover surface of the packing gland; a second packing is provided on the shaft end of the packing gland away from the outlet disc, and a packing sleeve is provided outside the packing gland and the second packing.
[0006] The beneficial effects of the utility model are as follows: hot air is blown from the second packing to the direction of the seat sleeve, and by arranging the second packing in the packing sleeve, air leakage at the shaft end is reduced, and the second packing can be protected from fly ash in the hot air. A packing box is arranged next to the second packing, and the first packing is arranged in the packing box. Even if the second packing is damaged, the first packing can continue to work. At the same time, the packing pressure ring arranged outside the packing box can further reduce air leakage at the shaft end and prevent fly ash in the hot air from being blown into the seat sleeve and into the bearing. The device has strong sealing performance and high fault tolerance, and is worthy of large-scale promotion.
[0007] On the basis of the above technical solution, the present invention can also be improved as follows.
[0008] Furthermore, a packing box fixing ring with a T-shaped cross section is sleeved in the packing box, and two first packings are respectively clamped on the inner side of the T-shaped cross section of the packing box fixing ring.
[0009] Furthermore, the packing box fixing ring and the packing pressure ring are both detachably spliced by two semicircular arc Z-shaped ones; the packing box is a buckle structure, and the two sides are detachably connected by screws.
[0010] Furthermore, the seat sleeve is a tin bronze sleeve.
[0011] Furthermore, the first packing and the second packing are both made of carbon fiber graphite. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the structure of a shaft end sealing device for a hot primary air regulating valve of a coal mill according to the utility model;
[0013] Figure 2 This is a schematic diagram of a packing pressure ring of a shaft end sealing device for a hot primary air regulating valve of a coal mill according to the utility model;
[0014] Figure 3 It is a schematic diagram of a packing box fixing ring of a shaft end sealing device of a hot primary air regulating valve of a coal mill according to the utility model;
[0015] Figure 4 The utility model is a schematic diagram of a packing box of a shaft end sealing device of a hot primary air regulating door of a coal mill.
[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0017] 1. Open disc; 2. Packing pressure ring; 3. Packing box; 4. Packing box fixing ring; 5. Bushing with seat; 6. Shaft end; 7. Packing gland; 8. Packing sleeve; 9. First packing; 10. Second packing; 11. Screw. DETAILED DESCRIPTION
[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0019] like Figures 1 to 4 As shown, embodiment 1 of the utility model is a shaft end sealing device for a hot primary air regulating valve of a coal mill, wherein a shaft end 6 is provided with a seat sleeve 5, an open disc 1 and a packing gland 7 at intervals along the extending direction, the open disc 1 and the packing gland 7 are fixedly connected by a screw 11, a packing box 3 is provided on the shaft end 6 between the open disc 1 and the packing gland 7, a plurality of first packings 9 are provided in the packing box 3, and two sides of the packing box 3 are respectively abutted against the inner disk surface of the open disc 1 and the inner cover surface of the packing gland 7 through two packing pressure rings 2; a second packing 10 is provided on the shaft end 6 of the packing gland 7 facing away from the outlet disc 1, and a packing sleeve 8 is provided outside the packing gland 7 and the second packing 10.
[0020] Hot air is blown from the second packing 10 toward the seat sleeve 5. By arranging the second packing 10 in the packing sleeve 8, air leakage of the shaft end 6 is reduced, and the second packing 10 can also be protected from fly ash in the hot air. A packing box 3 is arranged next to the second packing 10, and a first packing 9 is arranged in the packing box 3. Even if the second packing 10 is damaged, the first packing 9 can continue to work. At the same time, the packing pressure ring 2 arranged outside the packing box 3 can further reduce air leakage of the shaft end 6 and prevent fly ash in the hot air from being blown into the seat sleeve 5 and into the bearing. The device has strong sealing performance and high fault tolerance, and is worthy of large-scale promotion.
[0021] Embodiment 2 of the utility model is a shaft end sealing device for a hot primary air regulating valve of a coal mill. On the basis of embodiment 1, a packing box fixing ring 4 with a T-shaped cross section is sleeved inside a packing box 3, and two first packings 9 are respectively clamped inside the T-shaped cross section of the packing box fixing ring 4. The T-shaped structure is conducive to fixing the first packing 9 and is also convenient for installation and removal.
[0022] Embodiment 3 of the utility model is a shaft end sealing device for the hot primary air regulating valve of a coal mill. On the basis of embodiment 2, the packing box fixing ring 4 and the packing pressure ring 2 are both detachably spliced by two semicircular arcs in a Z shape; the packing box 3 is a buckle structure, and the two sides are detachably connected by screws. There is no need to remove other parts at both ends of the shaft end 6, and the packing box fixing ring 4, the packing pressure ring 2 and the packing box 3 can be directly disassembled along the vertical direction of the shaft end 6, which is convenient to operate; at the same time, the Z-shaped splicing connection method forms a positive and negative stop to prevent left and right movement.
[0023] Embodiment 4 of the utility model is a coal mill hot primary air regulating valve shaft end sealing device. On the basis of embodiment 1, the seat sleeve 5 is a tin bronze sleeve. Replacing the seat bearing in the prior art with the tin bronze sleeve seat sleeve 5 can avoid damage to the bearing due to high temperature baking; tin bronze dissipates heat quickly, further avoiding high temperature damage to the bearing.
[0024] Embodiment 5 of the utility model is a coal mill hot primary air regulating valve shaft end sealing device. On the basis of embodiment 4, the first packing 9 and the second packing 10 are both made of carbon fiber graphite. Carbon fiber and graphite have good wear resistance and are suitable for use as packing materials.
[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A coal mill hot primary air regulating valve shaft end sealing device, characterized in that: The shaft end (6) is provided with a seat sleeve (5), an open disc (1) and a packing gland (7) at intervals along the extension direction. The open disc (1) and the packing gland (7) are fixedly connected by a screw (11). A packing box (3) is provided on the shaft end (6) between the open disc (1) and the packing gland (7). A plurality of first packings (9) are provided in the packing box (3). Two sides of the packing box (3) are respectively abutted against the inner disk surface of the open disc (1) and the inner cover surface of the packing gland (7) through two packing pressure rings (2); a second packing (10) is provided on the shaft end (6) on the side of the packing gland (7) away from the open disc (1), and a packing sleeve (8) is provided on the outer sleeve of the packing gland (7) and the second packing (10).
2. According to claim 1, a coal mill hot primary air regulating valve shaft end sealing device is characterized in that: The packing box (3) is sleeved with a packing box fixing ring (4) having a T-shaped cross section, and two of the first packings (9) are respectively clamped on the inner side of the T-shaped cross section of the packing box fixing ring (4).
3. The shaft end sealing device of the hot primary air regulating valve of a coal mill according to claim 2, characterized in that: The packing box fixing ring (4) and the packing pressing ring (2) are both detachably spliced by two semicircular arcs in a Z shape; the packing box (3) is a buckle structure, and the two sides are detachably connected by screws.
4. The shaft end sealing device of the hot primary air regulating valve of a coal mill according to claim 1, characterized in that: The seated shaft sleeve (5) is a tin bronze shaft sleeve.
5. A coal mill hot primary air regulating valve shaft end sealing device according to claim 4, characterized in that: The first packing (9) and the second packing (10) are both made of carbon fiber graphite material.