Shaft seal device for coal mill propeller of boiler in thermal power plant
The shaft sealing device for the coal mill propeller in a thermal power plant boiler, with its multi-layer sealing structure and inclined plate design, solves the problem of poor sealing performance, achieves good sealing and stability, and avoids hot air leakage and dust pollution.
Patent Information
- Application Number
- CN202520072635.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-01-13
AI Technical Summary
The shaft sealing device of the traditional boiler coal mill propeller has poor sealing effect in high temperature, high pressure and dust environment, resulting in hot air leakage and pollution of workshop air.
It adopts a multi-layer sealing structure, including a rigid sealing ring and an elastic sealing ring, combined with an inclined plate design, to form a multi-layer sealing defense line, ensuring that the sealing ring is stable during installation and maintaining a good sealing state through the deformation of the elastic sealing ring.
It effectively prevents high-temperature hot air leakage, avoids dust pollution, improves the sealing and stability of the shaft sealing device, and keeps the workshop air clean.
Smart Images
Figure CN223594977U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of the equipment of thermal power plant, concretely is the shaft seal device of thermal power plant boiler coal mill propeller. BACKGROUND
[0002] In the daily operation of modern thermal power plant, the boiler coal mill propeller is one of the indispensable core components. Its shaft as the key pivot connecting the inside of the coal mill and the hot air box, the working condition is extremely rigorous. The hot air box is filled with high temperature airflow, the temperature is often as high as several hundred degrees Celsius, accompanied by high pressure and a large number of dust particles.
[0003] The traditional shaft seal device is only connected through the sleeve and the flange, a separate sealing ring is arranged in the sleeve, after using for a period of time, the internal sealing ring wears, the sealing effect of the sealing ring is poor, cannot effectively cope with such harsh working conditions, the problem of shaft sealing is frequent, which not only leads to a large amount of high-temperature hot air leakage, but also the leaked hot air wraps the dust and spreads to the working environment, pollutes the workshop air.
[0004] Therefore, the technical personnel in the prior art provide the shaft seal device of the thermal power plant boiler coal mill propeller to solve the problem. CONTENT OF THE UTILITY MODEL
[0005] In order to solve the above problems, the utility model provides the shaft seal device of the thermal power plant boiler coal mill propeller.
[0006] In order to realize the above purpose, the technical scheme of the utility model is as follows:
[0007] The shaft seal device of the thermal power plant boiler coal mill propeller, including the shaft, the sleeve and the flange connected through the connecting piece are sleeved on the shaft, the cavity is formed between the flange and the sleeve, the positioning block integrated with the flange is arranged on the inside of the sleeve, a plurality of hard sealing rings and elastic sealing rings are alternately arranged on the inside of the cavity on the shaft, the inner wall of the sleeve is also equiangularly fixedly installed with a plurality of inclined plates, one side of the inclined plate is provided as an inclined surface, and the width of the inclined plate is uniformly narrowed along the direction towards the flange, the inclined plate is inserted at the edge of the plurality of hard sealing rings, elastic sealing rings and positioning blocks, the space formed between the shaft, the flange and the sleeve is filled with the inclined plate, the hard sealing ring and the elastic sealing ring, and the inclined plate and the elastic sealing ring are transitionally matched.
[0008] Preferably, the annular outer side surface of the hard sealing ring is in contact with the inner wall of the sleeve, and the annular inner side surface of the hard sealing ring is in contact with the side surface of the shaft.
[0009] Preferably, the cross section of the inclined plate is provided as a right trapezoid, and the sleeve is in contact with the flange under the condition that the inclined plate is completely matched with the positioning block.
[0010] Preferably, the elastic sealing ring is provided with a plurality of circular holes, and the plurality of circular holes are uniformly arranged.
[0011] Preferably, the plurality of hard sealing rings have the same thickness, and the plurality of elastic sealing rings have the same thickness, the width of the elastic sealing ring is smaller than the width of the hard sealing ring, and the contact surfaces of the elastic sealing ring and the hard sealing ring are rough surfaces.
[0012] In summary, the utility model has the following beneficial technical effects:
[0013] The inclined plate can be aligned with the groove on the side surface of the positioning block, so that the flange and the sleeve are aligned, the mounting of the connecting piece is facilitated, the sealing ring and other components can be extruded and fixed during the mounting of the connecting piece, the mounting is more stable, and the sealing performance is better. Through the transition cooperation of the inclined plate and the elastic sealing ring, the elastic sealing ring can be deformed, the hard sealing ring is always extruded, the elastic sealing ring and the shaft and the hard sealing ring and the shaft are always in a good sealing state, good sealing can be achieved during long-term use, high-temperature hot air leakage is avoided, and the leakage of hot air carrying dust is prevented from being scattered to the working environment, thereby preventing the air in the workshop from being polluted. BRIEF DESCRIPTION OF DRAWINGS
[0014] The disclosure of the utility model will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the utility model. In the drawings, the same reference numerals are used to refer to the same parts. Among them:
[0015] Figure 1 is a schematic diagram of the overall structure of the utility model;
[0016] Figure 2 is a schematic diagram of the front view of the utility model;
[0017] Figure 3 is a schematic diagram of the side view of the utility model;
[0018] Figure 4 is a schematic diagram of the side view of the elastic sealing ring of the utility model.
[0019] Mark explanation: 1, shaft; 2, flange; 21, sleeve; 22, inclined plate; 23, positioning block; 24, hard sealing ring; 25, elastic sealing ring. DETAILED DESCRIPTION
[0020] It is easy to understand that according to the technical scheme of the utility model, a plurality of structure modes and implementation modes which can be replaced with each other can be proposed by the general skilled in the art without changing the essential spirit of the utility model. Therefore, the following specific embodiments and drawings are only exemplary description of the technical scheme of the utility model, and should not be regarded as the whole of the utility model or regarded as the limitation or restriction of the technical scheme of the utility model.
[0021] The shaft sealing device of the coal mill propeller of the boiler of the thermal power plant, referring to Figure 1 and Figure 2 , comprising the shaft 1 extending to the hot air box of the coal mill propeller, the flange 2 and the sleeve 21 connected through the connecting piece are sleeved on the shaft 1, the flange 2 is fixed on the hot air box, the tight connection with the hot air box is realized, and a stable support foundation is provided for the whole shaft sealing device, the sleeve 21 abuts against the coal mill propeller, and the effective protection of the shaft extension part is ensured.
[0022] Referring to Figure 1 , Figure 2 and Figure 3 , the cavity is formed between the flange 2 and the sleeve 21, the positioning block 23 integrated with the flange 2 is arranged on the flange 2 inside the sleeve 21, a plurality of hard sealing rings 24 and elastic sealing rings 25 are alternately arranged on the shaft 1 inside the cavity, the thicknesses of the plurality of hard sealing rings 24 are the same, the annular outer side surface of the hard sealing ring 24 is in contact with the inner wall of the sleeve 21, the annular inner side surface of the hard sealing ring 24 is in contact with the side surface of the shaft 1, the hard sealing ring 24 has good wear resistance and structural strength, can bear certain pressure and friction, effectively blocks the hot air and dust, the thicknesses of the plurality of elastic sealing rings 25 are also the same, the elastic sealing ring 25 fills the possible small gap between the hard sealing rings 24 by using the elastic property, enhances the sealing performance, and the two complement each other to build a multi-level sealing defense line, referring to Figure 4 , a plurality of round holes are arranged on the elastic sealing ring 25, and the plurality of round holes are uniformly arranged, the round holes can effectively balance the pressure difference inside and outside the elastic sealing ring 25, the width of the elastic sealing ring 25 is less than that of the hard sealing ring 24, and the contact surfaces of the elastic sealing ring 25 and the hard sealing ring 24 are rough surfaces.
[0023] Referring to Figure 1 , Figure 2 and Figure 3The inner wall of the sleeve 21 is also fixedly installed with multiple inclined plates 22 at equal angles, one side of the inclined plate 22 is provided as an inclined surface, and the width of the inclined plate 22 is uniformly narrowed along the direction towards the flange 2, the inclined plate 22 is inserted at the edge of multiple hard sealing rings 24, elastic sealing rings 25 and positioning blocks 23, the side of the multiple hard sealing rings 24, elastic sealing rings 25 and positioning blocks 23 is provided with grooves matched with the width of the inclined surface of the inclined plate 22, the inclined plate 22, the hard sealing ring 24 and the elastic sealing ring 25 fill the space formed between the shaft 1, the flange 2 and the sleeve 21, and the inclined plate 22 and the elastic sealing ring 25 are in transition fit, the cross section of the inclined plate 22 is provided as a right trapezoid, and when the inclined plate 22 is completely matched with the positioning block 23, the sleeve 21 is in contact with the flange 2, the design of the inclined plate 22 can align the inclined plate 22 with the groove on the side of the positioning block 23, thereby facilitating the alignment of the flange 2 and the sleeve 21, facilitating the installation of the connecting piece, and also being capable of extruding and fixing the sealing ring and other components during the installation of the connecting piece, so that the installation is more stable, and the sealing performance is better.
[0024] The technical scope of the utility model is not only limited to the contents in the above description, and the skilled in the art can make various deformations and modifications to the above embodiment without departing from the technical thought of the utility model, and these deformations and modifications should all belong to the protection scope of the utility model.
Claims
1. A shaft sealing device for a coal mill propeller in a thermal power plant boiler, comprising a shaft (1), characterized in that: A flange (2) and a sleeve (21) connected by a connector are fitted on the shaft (1). A cavity is formed between the flange (2) and the sleeve (21). A positioning block (23) integrally formed with the flange (2) is provided on the flange (2) inside the sleeve (21). Multiple hard sealing rings (24) and elastic sealing rings (25) are alternately arranged on the shaft (1) inside the cavity. The inner wall of the sleeve (21) is also fixedly installed with multiple inclined plates (22) at equal angles. One side of the inclined plate (22) is set as an inclined surface, and the width of the inclined plate (22) narrows uniformly along the direction towards the flange (2). The inclined plate (22) is inserted into the edge of multiple hard sealing rings (24), elastic sealing rings (25) and positioning blocks (23). The inclined plate (22), hard sealing rings (24) and elastic sealing rings (25) fill the space formed between the shaft (1), flange (2) and sleeve (21), and the inclined plate (22) and elastic sealing rings (25) are transitionally fitted.
2. The shaft sealing device for the coal mill propeller of a thermal power plant boiler according to claim 1, characterized in that: The outer annular side of the hard sealing ring (24) contacts the inner wall of the sleeve (21), and the inner annular side of the hard sealing ring (24) contacts the side of the shaft (1).
3. The shaft sealing device for the coal mill propeller of a thermal power plant boiler according to claim 2, characterized in that: The cross section of the inclined plate (22) is set as a right trapezoid, and when the inclined plate (22) and the positioning block (23) are fully engaged, the sleeve (21) contacts the flange (2).
4. The shaft sealing device for the coal mill propeller of a thermal power plant boiler according to claim 1, characterized in that: The elastic sealing ring (25) is provided with multiple round holes, and the multiple round holes are evenly arranged.
5. The shaft sealing device for the coal mill propeller of a thermal power plant boiler according to claim 4, characterized in that: The multiple hard sealing rings (24) have the same thickness, and the multiple elastic sealing rings (25) also have the same thickness. The width of the elastic sealing ring (25) is smaller than the width of the hard sealing ring (24), and the contact surfaces of the elastic sealing ring (25) and the hard sealing ring (24) are both rough surfaces.