Shaft end sealing device of air preheater
By designing an air preheater shaft end sealing device including a cooling box and flange, and using a micro-air pump and a one-way exhaust valve to form a high-efficiency gas circulation system, the problem that the air preheater shaft end sealing device in the prior art cannot achieve good sealing in a high temperature environment, and the stable operation and long-term reliability of the equipment are achieved.
Patent Information
- Application Number
- CN202421784431.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The existing air preheater shaft end sealing device cannot achieve good sealing effect under high temperature environments, resulting in dust leakage and air leakage, short service life and frequent maintenance.
An air preheater shaft end sealing device including a cooling box and flange is designed, and a micro-air pump and one-way exhaust valve are used to form an efficient gas circulation system. By sealing the heat dissipation shell and multiple grooves, the heat exchange efficiency is improved, and the sealing assembly is ensured to stable operation in a high-temperature environment.
It realizes effective sealing in high temperature environments, extends the service life of sealing components, reduces maintenance frequency, and ensures stable operation and long-term reliability of the equipment.
Smart Images
Figure CN222772664U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sealing device manufacturing, in particular to an air preheater shaft end sealing device. Background Art
[0002] The rotary air preheater is an important heat exchange equipment for thermal power generation units. The traditional air preheater shaft end seal mainly adopts two methods: one is an aluminum sealing device; the other is a packing seal. The aluminum sealing device is two semicircular aluminum plates, the center of which is processed into a circular hole equivalent to the outer diameter of the air preheater bearing. The two semicircular aluminum plates are fixed to the shaft end through a pressure plate, and the main shaft is clamped so that there is no gap between the aluminum plate and the main shaft to achieve a sealing effect. In actual use, due to the rotation of the main shaft, wear occurs between the aluminum plate and the main shaft, and the gap becomes larger and larger, resulting in ash leakage and air leakage. The packing seal mainly presses the graphite packing in the gap between the main shaft and the bearing housing to achieve a sealing effect, but since this type of material has no elasticity, the friction between the main shaft and the main shaft will cause wear on the main shaft surface, thereby generating a gap, which not only damages the main shaft, but also causes ash leakage and air leakage, polluting the on-site environment, increasing the maintenance volume and energy consumption, and reducing the service life of the equipment. In summary, both types of sealing methods cannot achieve a good sealing effect on the bearings in the air preheater. This is mainly because the shaft of the air preheater passes through the bearing, and the ambient temperature of the end cover is around 350°C. If the shaft end is directly sealed, there is currently no elastic seal that can withstand a high temperature of 350°C. Even if it is forcibly installed, the elastic seal will age very quickly, have a short service life, and require frequent replacement and maintenance.
[0003] In summary, in order to increase the service life of the sealing component and enhance the sealing effect of the air preheater, we proposed an air preheater shaft end sealing device. Utility Model Content
[0004] The utility model aims to provide an air preheater shaft end sealing device to improve the problems of poor sealing performance and short service life of the sealing assembly proposed in the above background.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] An air preheater shaft end sealing device includes a rotating shaft, characterized in that it includes: a cooling box and a flange, the cooling box is fixedly installed above the flange, the cooling box and the flange form a cooling chamber, a micro air pump is installed on the left side of the cooling box, and a one-way exhaust valve is installed on the right side, the flange is sleeved on the outside of the rotating shaft, an elastic rubber body is installed above the flange, a pressure cover is sleeved on the outside of the elastic rubber body, a sealed heat dissipation shell is installed on the outside of the pressure cover, and the sealed heat dissipation shell is located in the cooling chamber.
[0007] Preferably, the flange is fixedly mounted on the surface of the air preheater shell.
[0008] Preferably, the micro air pump is connected to the cold air inlet of the air preheater to pump in cold air, and the one-way exhaust valve is connected to the hot air outlet of the air preheater to discharge hot air.
[0009] Preferably, an oblique annular groove is provided inside the elastic rubber body to increase elastic deformation and improve sealing performance, and a hoop is sleeved on the outside of the elastic rubber body and is tightly held.
[0010] Preferably, the gland is installed above the flange, a first annular press platform is provided below the gland, and a first sealing ring is installed between the first annular press platform and the flange to ensure the air tightness of the device.
[0011] Preferably, a plurality of grooves are provided on the side of the sealed heat dissipation shell to increase the contact area with the primary cold air.
[0012] Preferably, the sealed heat dissipation shell is fixedly installed above the flange, a second annular press platform is provided below the sealed heat dissipation shell and is located above the flange, and a second sealing ring is installed between the second annular press platform and the flange and is located outside the first annular press platform.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] The utility model adopts an innovative cooling box design, which uses a micro air pump to suck the external primary cold air into the interior of the cooling box device, thereby forming an efficient gas circulation system. This system can quickly take away the heat on the surface of the sealed heat dissipation box and discharge the heat through the air outlet. In order to ensure the unidirectionality of gas flow and prevent possible gas backflow, the utility model uses a one-way air valve. In addition, in order to further improve the heat exchange efficiency, a plurality of grooves are designed on the side of the sealed heat dissipation box. The presence of these grooves increases the surface area of the heat dissipation structure, allowing heat to be dissipated from the heat dissipation box faster and more evenly, thereby ensuring the heat exchange efficiency of the device under high-load working conditions, ensuring that the internal temperature of the sealing component will not be too high when working in a high temperature environment, ensuring the service life of the elastic rubber body, and ensuring the stable operation and long-term reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a three-dimensional diagram of an air preheater shaft end sealing device of the utility model
[0016] Figure 2 This is a disassembled diagram of an air preheater shaft sealing device of the utility model
[0017] Figure 3 This is a cross-sectional view of the sealing structure of the air preheater shaft end sealing device of the utility model.
[0018] Figure 4 This is a schematic diagram of the press table structure of the air preheater shaft sealing device of the utility model
[0019] In the figure:
[0020] 1. Rotating shaft; 2. Cooling box; 3. Micro air pump; 4. Flange; 5. One-way exhaust valve; 6. Sealed heat dissipation shell; 7. Pressure cover; 8. Elastic rubber body; 9. Hoop; 10. Second sealing ring; 11. First sealing ring; 13. First annular press platform; 14. Oblique annular groove; 15. Cooling chamber; 16. Second annular press platform. DETAILED DESCRIPTION
[0021] 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 implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.
[0022] See also Figure 1-Figure 4 , the utility model provides a technical solution:
[0023] An air preheater shaft end sealing device includes a rotating shaft, characterized in that it includes: a cooling box and a flange, the cooling box is fixedly installed above the flange, the cooling box and the flange form a cooling chamber, a micro air pump is installed on the left side of the cooling box, and a one-way exhaust valve is installed on the right side, the flange is sleeved on the outside of the rotating shaft, an elastic rubber body is installed above the flange, a pressure cover is sleeved on the outside of the elastic rubber body, a sealed heat dissipation shell is installed on the outside of the pressure cover, and the sealed heat dissipation shell is located in the cooling chamber.
[0024] The flange is fixedly installed on the surface of the air preheater shell.
[0025] The micro air pump is connected to the cold air inlet of the air preheater to pump in primary cold air, and the one-way exhaust valve is connected to the hot air outlet of the air preheater to exhaust hot air.
[0026] An oblique annular groove is arranged inside the elastic rubber body to increase elastic deformation and improve sealing performance. A hoop is sleeved on the outer side of the elastic rubber body and is tightly held.
[0027] The gland is installed above the flange, a first annular press platform is provided below the gland, and a first sealing ring is installed between the first annular press platform and the flange to ensure the air tightness of the device.
[0028] The side of the sealed heat dissipation shell is provided with multiple grooves to increase the contact area with the primary cold air.
[0029] The sealed heat dissipation shell is fixedly installed above the flange, a second annular pressing platform is arranged below the sealed heat dissipation shell and is located above the flange, a second sealing ring is installed between the second annular pressing platform and the flange and is located outside the first annular pressing platform.
Claims
1. An air preheater shaft end sealing device, comprising a rotating shaft (1), characterized in that: include: A cooling box (2) and a flange (4), wherein the cooling box (2) is fixedly mounted above the flange (4), and the cooling box (2) and the flange (4) form a cooling chamber (15). A micro air pump (3) is mounted on the left side of the cooling box (2), and a one-way exhaust valve (5) is mounted on the right side. The flange (4) is sleeved on the outside of the rotating shaft (1), an elastic rubber body (8) is mounted above the flange (4), a pressure cover (7) is sleeved on the outside of the elastic rubber body (8), a sealed heat dissipation shell (6) is mounted on the outside of the pressure cover, and the sealed heat dissipation shell (6) is located in the cooling chamber (15).
2. The air preheater shaft end sealing device according to claim 1, characterized in that: The flange (4) is fixedly mounted on the surface of the air preheater shell.
3. The air preheater shaft end sealing device according to claim 1, characterized in that: The micro air pump (3) is connected to the cold air inlet of the air preheater to pump in cold air, and the one-way exhaust valve (5) is connected to the hot air outlet of the air preheater to exhaust hot air.
4. The air preheater shaft end sealing device according to claim 1, characterized in that: An oblique annular groove (14) is provided on the inner side of the elastic rubber body (8) for increasing elastic deformation and improving sealing performance. A hoop ring (9) is sleeved on the outer side of the elastic rubber body (8) and is tightly clamped.
5. The air preheater shaft end sealing device according to claim 1, characterized in that: The gland (7) is installed above the flange (4), a first annular press platform (13) is provided below the gland (7), and a first sealing ring (11) is installed between the first annular press platform (13) and the flange (4) to ensure the air tightness of the device.
6. The air preheater shaft end sealing device according to claim 1, characterized in that: The sealed heat dissipation shell (6) is provided with a plurality of grooves on its side surface, so as to increase the contact area with the primary cold air.
7. The air preheater shaft end sealing device according to claim 6, characterized in that: The sealed heat dissipation shell (6) is fixedly mounted above the flange (4); a second annular pressing platform (16) is provided below the sealed heat dissipation shell (6) and is located above the flange (4); a second sealing ring (10) is installed between the second annular pressing platform (16) and the flange (4) and is located outside the first annular pressing platform (13).