CN215112564U - Novel combustor swing actuating mechanism of power station boiler - Google Patents
Novel combustor swing actuating mechanism of power station boiler Download PDFInfo
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- CN215112564U CN215112564U CN202120973040.XU CN202120973040U CN215112564U CN 215112564 U CN215112564 U CN 215112564U CN 202120973040 U CN202120973040 U CN 202120973040U CN 215112564 U CN215112564 U CN 215112564U
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Abstract
The utility model provides a novel combustor swing actuating mechanism of power plant boiler, include the turning arm subassembly and fix the external bearing subassembly in the turning arm subassembly outside. The middle rotating part of the utility model is transferred from the inside of the secondary air box of the boiler to the outside of the secondary air box and has a longer distance, the working environment is greatly improved, and the jamming risk is reduced; the crank arm assembly and the crank arm shaft are in key connection instead, the crank arm assembly and the crank arm shaft rotate integrally, a small fit clearance can be adopted between the hole and the shaft, relative rotation is avoided during operation, the fit clearance cannot be increased, and the adjustment precision of the burner swing actuating mechanism is improved; the packing chamber is used for sealing between the secondary air box plate and the crank arm shaft, so that secondary air is prevented from leaking outwards to pollute the external environment and cause overhigh operating temperature of a bearing assembly to influence the service life of the bearing; the crank arm is changed from an original Q235 iron casting into a #20 steel crank arm, so that the brittleness of the crank arm assembly is reduced while the strength of the crank arm assembly is improved.
Description
Technical Field
The utility model belongs to the swing mechanism field, concretely relates to novel combustor swing actuating mechanism of power plant boiler.
Background
The ultra-supercritical Pi-shaped boiler hearth produced and manufactured by Harbin boiler plants at present is of a rectangular structure, 8 burners are arranged on the front wall and the rear wall of the boiler hearth, four burners are arranged on the front wall, four burners are arranged on the rear wall, and the burners are arranged anticlockwise and are No. 1-No. 8 in sequence. At present, a low-nitrogen burner is transformed into most boilers, and a thick-thin separation burner is transformed into the low-NOX-MPM burner. When in modification, the original primary air thick coal powder nozzle and the lower DUMMY air chamber are combined to be changed into the current larger primary air nozzle. The original primary air light coal powder nozzle is changed into a secondary air nozzle. Other corresponding secondary air nozzles are also correspondingly modified. The oil spout was not modified. The secondary air flap is not modified. The external actuating mechanism, the main connecting rod, the internal big crank arm and the segmented T-shaped steel assembly are not changed.
After the low-nitrogen combustor is reformed, the phenomena of locking and damage of a crank arm occur for many times, so that the nozzle is not adjusted in place, the problem is not thoroughly solved all the time, and the metal wall temperature of the heating surface of the boiler and the temperature of main reheat steam are difficult to adjust. The research shows that the swinging actuating mechanism of the burner is jammed and the crank arm is locked and damaged as a common problem by professional personnel of a plurality of power station boilers of the same type, and negative influence is caused on the operation safety and the economical efficiency of the boilers.
The reason for the jamming of the original burner swing actuating mechanism is analyzed as follows:
(1) the clearance between the external shaft of the original burner swing actuating mechanism and the crank arm hole is 0-0.05mm, the clearance is small, and the swing actuating mechanism is easy to deform and jam due to thermal expansion because the working temperature of the burner swing actuating mechanism is more than 300 ℃;
(2) because the crank arm (rotating part) and the shaft (fixing part) of the burner swing executing mechanism are matched in a sliding mode, dust is more in the working environment, the matching gap between the shaft and the crank arm hole is smaller, once dust or magazines enter the matching gap, the rotating resistance is easily increased, and the jamming is further caused;
(3) the crank arm of the original burner actuating mechanism is an iron casting, and once the resistance is increased, the crank arm is easy to break, so that the tilt angle of the burner cannot be adjusted directly and cannot be processed during operation.
Therefore, it is an urgent need to solve the above problems by those skilled in the art to develop a burner oscillation actuator capable of effectively preventing the seizure.
Disclosure of Invention
In order to solve the problem, the utility model discloses a novel combustor swing actuating mechanism of power plant boiler.
In order to achieve the above object, the utility model provides a following technical scheme:
a novel burner swing actuating mechanism of a power station boiler comprises a crank arm assembly and an external bearing assembly fixed on the outer side of the crank arm assembly; the external bearing assembly comprises a crank arm shaft, a bearing assembly and a packing assembly; one end of the crank arm shaft is fixed on the outer side of the crank arm assembly, and the other end of the crank arm shaft is matched with a bearing assembly; the bearing assembly comprises a bearing and a bearing gland; the bearing is arranged at one end of the crank arm shaft away from the crank arm assembly in a matching way; the bearing gland is arranged at two ends of the bearing in a matching way; the packing assembly comprises a packing chamber and a packing gland; the packing chamber is arranged on the surface of the middle part of the crank arm shaft in a surrounding way, a packing cavity is formed in one side of the packing chamber and filled with packing, and a packing gland is installed at the other end of the packing chamber in a matching way.
Furthermore, one end of the crank arm shaft corresponding to the crank arm assembly is provided with a key groove and a key which are matched with each other, and the crank arm shaft and the crank arm assembly are fixed through the key groove and the key which are matched with each other.
Further, the crank arm shaft is fixedly welded with the outer side of the crank arm assembly.
Further, the bearing assembly also comprises a bearing seat; the bearing block is sleeved at one end of the crank arm shaft, which is far away from the crank arm assembly; the bearing is arranged in the bearing seat in a matching way; the bearing gland is respectively arranged at the bottom of the bearing seat and the top of the bearing seat, and the bearing gland positioned at the top of the bearing seat is sealed with the bearing through an oil seal.
Further, the crank arm assembly is composed of several #20 steel crank arms.
Compared with the prior art, the utility model, following beneficial effect has:
1. the crank arm assembly is changed from the original sliding mode rotation between the shaft and the hole into the whole crank arm assembly to rotate in a rolling mode through the external bearing assembly, and the rolling friction resistance is greatly reduced compared with the sliding friction resistance;
2. the rotating part is transferred to the outside of the secondary air box from the inside of the secondary air box of the boiler and has a longer distance, so that the working environment is greatly improved, and the jamming risk is reduced;
3. the crank arm assembly and the crank arm shaft are in key connection instead, the crank arm assembly and the crank arm shaft rotate integrally, a small fit clearance can be adopted between the hole and the shaft, relative rotation is avoided during operation, the fit clearance cannot be increased, and the adjustment precision of the burner swing actuating mechanism is improved;
4. the packing chamber is used for sealing between the secondary air box plate and the crank arm shaft, so that secondary air is prevented from leaking outwards to pollute the external environment and cause overhigh operating temperature of a bearing assembly to influence the service life of the bearing;
5. the crank arm is changed from an original Q235 iron casting into a #20 steel crank arm, so that the brittleness of the crank arm assembly is reduced while the strength of the crank arm assembly is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
list of reference numerals: the device comprises a crank arm shaft 1, a bearing 2, a bearing gland 3, a packing chamber 4, a packing gland 5, packing 6, a key groove 7, a bearing seat 8 and an oil seal 9.
Detailed Description
The technical solutions provided by the present invention will be described in detail with reference to specific embodiments, and it should be understood that the following specific embodiments are only used for illustrating the present invention and are not used for limiting the scope of the present invention.
The utility model relates to a novel combustor swing actuating mechanism of power plant boiler, include the turning arm subassembly and fix the external bearing subassembly in the turning arm subassembly outside.
The external bearing assembly comprises a crank arm shaft 1, a bearing assembly and a packing assembly; the corresponding one end of turning arm axle 1 and turning arm subassembly is equipped with matched with keyway 7 and key respectively, cooperates with the key through keyway 7, realizes turning arm axle 1 and turning arm subassembly and fixes mutually, and the other end cooperation installation bearing subassembly.
The bearing assembly comprises a bearing 2 and a bearing gland 3; the bearing 2 is arranged at one end of the crank arm shaft 1 far away from the crank arm assembly in a matching way; the bearing gland 3 is arranged at two ends of the bearing 2 in a matching way; the packing assembly comprises a packing chamber 4 and a packing gland 5; the packing chamber 4 is arranged on the surface of the middle part of the crank shaft 1 in a surrounding way, a packing cavity is formed in one side of the packing chamber, packing 6 is filled in the packing chamber, and a packing gland 5 is installed at the other end of the packing chamber in a matching way.
The bearing assembly also comprises a bearing seat 8; the bearing seat 8 is sleeved at one end of the crank arm shaft 1 far away from the crank arm assembly; the bearing 2 is arranged in the bearing seat 8 in a matching way; the bearing gland 3 is respectively installed at the bottom of the bearing seat 8 and the top of the bearing seat 8, and the bearing gland and the bearing at the top of the bearing seat are sealed through an oil seal 9.
And the bearing seat 8 is welded and fixed on a secondary air box body at the outer side of the crank arm component of the burner swing actuating mechanism.
The crank arm assembly consists of a plurality of #20 steel crank arms.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that those modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all should be covered in the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a novel combustor swing actuating mechanism of power plant boiler which characterized in that: the crank arm assembly comprises a crank arm assembly and an external bearing assembly fixed on the outer side of the crank arm assembly; the external bearing assembly comprises a crank arm shaft (1), a bearing assembly and a packing assembly; one end of the crank arm shaft (1) is fixed on the outer side of the crank arm assembly, and the other end of the crank arm shaft is matched with a bearing assembly; the bearing assembly comprises a bearing (2) and a bearing gland (3); the bearing (2) is arranged at one end of the crank arm shaft (1) far away from the crank arm assembly in a matching way; the bearing gland (3) is arranged at two ends of the bearing (2) in a matching way; the packing assembly comprises a packing chamber (4) and a packing gland (5); the packing chamber (4) is arranged on the surface of the middle part of the crank arm shaft (1) in a surrounding mode, a packing cavity is formed in one side of the packing chamber, packing (6) is filled in the packing chamber, and a packing gland (5) is installed at the other end of the packing chamber in a matching mode.
2. The utility boiler novel burner swing actuator of claim 1, characterized in that: one end of the crank arm shaft (1) corresponding to the crank arm assembly is provided with a key groove (7) and a key which are matched with each other, and the crank arm shaft (1) is fixed with the crank arm assembly through the matching of the key groove (7) and the key.
3. The utility boiler novel burner swing actuator of claim 2, characterized in that: the crank arm shaft (1) is also welded and fixed with the outer side of the crank arm component.
4. The utility boiler novel burner swing actuator of claim 1, characterized in that: the bearing assembly further comprises a bearing seat (8); the bearing seat (8) is sleeved at one end of the crank arm shaft (1) far away from the crank arm assembly; the bearing (2) is arranged in the bearing seat (8) in a matching way; the bearing gland (3) is respectively arranged at the bottom of the bearing seat (8) and the top of the bearing seat (8), and the bearing gland and the bearing at the top of the bearing seat are sealed through an oil seal (9).
5. The utility boiler novel burner swing actuator of claim 1, characterized in that: the crank arm assembly consists of a plurality of #20 steel crank arms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120973040.XU CN215112564U (en) | 2021-05-08 | 2021-05-08 | Novel combustor swing actuating mechanism of power station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120973040.XU CN215112564U (en) | 2021-05-08 | 2021-05-08 | Novel combustor swing actuating mechanism of power station boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215112564U true CN215112564U (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120973040.XU Active CN215112564U (en) | 2021-05-08 | 2021-05-08 | Novel combustor swing actuating mechanism of power station boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215112564U (en) |
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2021
- 2021-05-08 CN CN202120973040.XU patent/CN215112564U/en active Active
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