Auxiliary construction device for bearing of rotary air preheater of power plant boiler
By installing side plates and thrust bearing support units on the outer wall of the rotary air preheater bearing housing, combined with a tilt fine-tuning device and differential screw drive, the problem of bearing housing level deviation was solved, achieving high-precision thrust bearing adjustment and meeting the concentricity requirements of the equipment during high-speed operation.
Patent Information
- Application Number
- CN202522508022.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-11-26
AI Technical Summary
During the construction of rotary air preheaters, deviations in the levelness of the bearing housing can lead to problems such as bearing failure, shaft bending, seal failure, energy loss, and increased vibration. Existing technologies make it difficult to achieve precise levelness adjustment.
An auxiliary construction device for bearings in a rotary air preheater of a power plant boiler was designed. By setting multiple sets of side plates and thrust bearing support units on the outer wall of the bearing housing, and using an inclination fine-tuning device and differential screw drive, the horizontality of the thrust bearing can be finely adjusted to ensure uniform contact between the bearing rolling elements and the raceway.
This achieved high-precision, low-step adjustment of the thrust bearing, improving construction efficiency, reducing operational complexity, and ensuring the concentricity of the equipment and high-speed operation requirements.
Smart Images
Figure CN224679929U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an auxiliary construction device for bearings of a rotary air preheater in a power plant boiler, belonging to the field of rotary air preheater construction technology. Background Technology
[0002] In industrial equipment installation projects, rotating machinery is widely used as power conversion equipment. For example, rotary air preheaters are the core equipment of large power plant boilers. However, current technology is not comprehensive, and their construction process has the following drawbacks: Rotary air preheaters are precision rotating equipment in boiler systems. The bearing housings must be kept horizontal and concentric during operation. The rotation of the transmission components and the transmitted components must be on the same rotation center. Otherwise, it will lead to problems such as bearing failure, shaft bending, seal failure, energy loss, and increased vibration, ultimately causing the equipment to fail to work properly.
[0003] To solve one of the above problems, there is an urgent need for an auxiliary construction device for the bearings of a rotary air preheater in a power plant boiler. Utility Model Content
[0004] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to accurately correct the horizontal deviation of the thrust bearing by independently adjusting one or more tilt fine-tuning devices. To this end, an auxiliary construction device for the bearing of a rotary air preheater in a power plant boiler is provided.
[0005] The auxiliary construction device for bearings of rotary air preheaters in power plant boilers according to this utility model includes a bearing housing, in which a thrust bearing is installed. The device is characterized in that: multiple sets of side plates are spaced apart on the outer wall of the bearing housing, the side plates are arranged around the center line of the thrust bearing and the included angle between adjacent sets is equal, a thrust bearing support unit is detachably installed between two adjacent sets of side plates, and a tilt adjustment device is installed on the thrust bearing support unit. The bottom end of the tilt adjustment device is supported on a thrust bearing support plate below the bearing housing.
[0006] Each thrust bearing support unit is equipped with a tilt adjustment device. The bottom end of the tilt adjustment device acts directly on the thrust bearing support plate. The support height of the adjustment device can be changed by rotating the adjustment component of the tilt adjustment device.
[0007] Because the thrust bearing support units are equidistantly distributed along the bearing centerline, the levelness deviation of the thrust bearing can be accurately corrected by independently adjusting one or more tilt adjustment devices. Specifically, when a tilt in a certain direction is detected, raising the corresponding side adjustment device or lowering the opposite side device allows the bearing housing to gradually bring the thrust bearing to the designed level accuracy, ensuring uniform contact between the bearing rolling elements and the raceway, and meeting the concentricity requirements for high-speed operation of rotary equipment.
[0008] Preferably, in any of the above embodiments, the side plates are provided in four sets: a first side plate, a second side plate, a third side plate, and a fourth side plate. The first, second, third, and fourth side plates are all welded to the outer wall of the thrust bearing. The first, second, third, and fourth side plates are arranged around the vertical centerline of the thrust bearing, with an included angle of 90 degrees between adjacent plates. The spacing between adjacent side plates is uniform, providing sufficient and regular operating space for the installation and disassembly of the thrust bearing support unit.
[0009] In any of the above embodiments, it is preferred that a set of thrust bearing support units is detachably installed between the first side plate and the second side plate, between the second side plate and the third side plate, between the third side plate and the fourth side plate, and between the fourth side plate and the first side plate. This satisfies the requirement for quick assembly and disassembly of the thrust bearing support units.
[0010] In any of the above embodiments, preferably, the thrust bearing support unit includes a vertical arc-shaped plate attached to the outer wall of the bearing housing. Connecting end plates A and B are integrally formed on both sides of the vertical arc-shaped plate. Connecting end plates A and B are detachably connected to their respective side plates via first connecting bolts and second connecting bolts. A horizontal arc-shaped plate is provided on the outer wall of the middle portion of the vertical arc-shaped plate. Multiple sets of tilt adjustment devices are installed on the horizontal arc-shaped plate, and through holes are provided on the horizontal arc-shaped plate to cooperate with the tilt adjustment devices. The multiple sets of adjustment devices work together to evenly distribute the load borne by the horizontal arc-shaped plate, preventing overload damage to a single adjustment device and improving the overall load-bearing capacity of the support unit.
[0011] In any of the above embodiments, it is preferred that the two ends of the horizontal arc-shaped plate are welded to the connecting end plate A and the connecting end plate B, respectively.
[0012] In any of the above embodiments, preferably, the tilt adjustment device includes an outer tube, a tail screw, a smooth rod, a front screw, and a lifting slide rod. The upper part of the outer tube passes through a through hole, and a connecting ring is integrally provided on the outer wall of the upper part of the outer tube. The connecting ring is fixedly connected to the horizontal arc plate by a third connecting bolt assembly. The upper inner part of the outer tube is provided with a threaded hole A that is threaded to the tail screw. The lower inner part of the outer tube is provided with a guide hole that cooperates with the lifting slide rod. The guide hole has a square cross-section. The upper part of the lifting slide rod is provided with a threaded hole B that cooperates with the front screw. The tail screw and the front screw are connected by a smooth rod. The threaded holes A and B have the same direction of rotation. The tail screw and the front screw have a first external thread and a second external thread, respectively. The lead of the first external thread is greater than the lead of the second external thread.
[0013] Differential screw drive can be used to make micro-adjustments to the lifting slide, thereby enabling fine-tuning of the thrust bearing's level. This meets the core requirements of "high precision and small step size" for thrust bearing leveling, avoiding precision deviations caused by excessive adjustment step size.
[0014] In any of the above embodiments, it is preferred that the tail screw, the smooth rod, and the front screw are integrally formed.
[0015] In any of the above embodiments, preferably, the bottom end of the lifting slide rod is hemispherical, the bottom end of the lifting slide rod is inserted into the connecting groove of the support foot, the upper end of the tail screw has an external hexagonal bolt head, the external hexagonal bolt head cooperates with the corresponding wrench to facilitate driving the tail screw to rotate, the tail screw drives the front screw to rotate through the smooth rod, the tail screw cooperates with the threaded hole A on the outer sleeve, the front screw cooperates with the threaded hole B on the lifting slide rod, and the tail screw rotates one revolution, driving the lifting slide rod to move a distance equal to the difference between the lead of the first external thread and the lead of the second external thread.
[0016] Compared with the prior art, the present invention has the following beneficial effects: The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model is equipped with a tilt adjustment device on each thrust bearing support unit. The bottom end of the tilt adjustment device acts directly on the thrust bearing support plate. The support height of the adjustment device can be changed by rotating the adjustment component of the tilt adjustment device, which has high construction efficiency and reduces operation complexity.
[0017] The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model has the ability to accurately correct the horizontal deviation of the thrust bearing by means of the thrust bearing support units being equidistantly distributed along the bearing centerline, through independent adjustment of one or more tilt fine-tuning devices.
[0018] The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model has a uniform spacing between adjacent side plates, providing sufficient and regular operating space for the installation and disassembly of the thrust bearing support unit.
[0019] The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model utilizes differential screw transmission to enable the lifting slide bar to achieve micro-adjustment, thereby achieving fine adjustment of the level of the thrust bearing, meeting the requirements for fine adjustment of the level of the thrust bearing, and avoiding the problem of accuracy deviation caused by excessive adjustment step. Attached Figure Description
[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0021] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the tilt adjustment device of this utility model; Figure 3 A schematic diagram of the structure of the thrust bearing support unit; Figure 4 for Figure 2 Cross-sectional view of AA.
[0022] In the diagram: 1. Bearing housing; 2. Thrust bearing support plate; 3. Thrust bearing; 4. External hexagonal bolt head; 5. Side plate; 6. Thrust bearing support unit; 6.1. Vertical arc plate; 6.2. Connecting end plate A; 6.3. Connecting end plate B; 6.4. First connecting bolt; 6.5. Second connecting bolt; 6.6. Horizontal arc plate; 6.7. Through hole; 7. Inclination fine adjustment device; 8. Outer sleeve; 9. Connecting ring; 10. Third connecting bolt assembly; 11. Tail end screw; 12. Smooth rod; 13. Front end screw; 14. Lifting slide rod; 15. Threaded hole A; 16. Threaded hole B; 17. Guide hole; 18. Support foot; 19. External hexagonal bolt head. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0024] Example 1, as Figure 1 and Figure 3As shown, the auxiliary construction device for the bearing of a rotary air preheater in a power plant boiler includes a bearing housing 1. A thrust bearing 3 is installed inside the bearing housing 1. Multiple sets of side plates 5 are spaced apart on the outer wall of the bearing housing 1. The side plates 5 are arranged around the center line of the thrust bearing 3, and the included angle between adjacent sets is equal. A thrust bearing support unit 6 is detachably installed between two adjacent sets of side plates 5. A tilt adjustment device 7 is installed on the thrust bearing support unit 6. The bottom end of the tilt adjustment device 7 is supported on a thrust bearing support plate 2 below the bearing housing 1. Each set of thrust bearing support units 6 is equipped with a tilt adjustment device 7. The bottom end of the tilt adjustment device 7 acts directly on the thrust bearing support plate 2. The support height of the tilt adjustment device can be changed by rotating the adjusting component of the tilt adjustment device 7.
[0025] Because the thrust bearing support units 6 are equidistantly distributed along the bearing centerline, the horizontal deviation of the thrust bearing can be accurately corrected by independently adjusting one or more tilt adjustment devices 7. That is, when the bearing is detected to be tilted in a certain direction, by raising the corresponding side adjustment device or lowering the opposite side device, the bearing housing drives the thrust bearing to gradually reach the designed horizontal accuracy, ensuring uniform contact between the bearing rolling elements and the raceway, and meeting the concentricity requirements of high-speed operation of rotary equipment.
[0026] Example 2, as Figure 1 As shown, the auxiliary construction device for the bearing of a rotary air preheater in a power plant boiler includes a bearing housing 1. A thrust bearing 3 is installed inside the bearing housing 1. Multiple sets of side plates 5 are spaced apart on the outer wall of the bearing housing 1. The multiple sets of side plates 5 are arranged around the center line of the thrust bearing 3, and the included angle between adjacent sets of side plates 5 is equal. A thrust bearing support unit 6 is detachably installed between two sets of adjacent side plates 5. A tilt adjustment device 7 is installed on the thrust bearing support unit 6. The bottom end of the tilt adjustment device 7 is supported on the thrust bearing support plate 2 below the bearing housing 1.
[0027] Furthermore, the side plates 5 are provided in four sets: a first side plate, a second side plate, a third side plate, and a fourth side plate. All four side plates are welded to the outer wall of the thrust bearing 3. The first, second, third, and fourth side plates are arranged around the vertical center line of the thrust bearing 3, with an included angle of 90 degrees between adjacent plates. The spacing between adjacent side plates is uniform, providing ample and regular operating space for the installation and disassembly of the thrust bearing support unit.
[0028] Furthermore, a set of thrust bearing support units 6 is detachably installed between the first side plate and the second side plate, between the second side plate and the third side plate, between the third side plate and the fourth side plate, and between the fourth side plate and the first side plate. This meets the requirement of quick assembly and disassembly of the thrust bearing support units 6.
[0029] Furthermore, the thrust bearing support unit 6 includes a vertical arc-shaped plate 6.1 attached to the outer wall of the bearing housing 1. Connecting end plates A6.2 and B6.3 are integrally formed on both sides of the vertical arc-shaped plate 6.1. Connecting end plates A6.2 and B6.3 are detachably connected to the corresponding side plates 5 via first connecting bolts 6.4 and second connecting bolts 6.5, respectively. A horizontal arc-shaped plate 6.6 is provided on the outer wall of the middle part of the vertical arc-shaped plate 6.1. Multiple sets of tilt adjustment devices 7 are installed on the horizontal arc-shaped plate 6.6, and through holes 6.7 are provided on the horizontal arc-shaped plate 6.6 to cooperate with the tilt adjustment devices 7. The multiple sets of adjustment devices work together to evenly distribute the load on the horizontal arc-shaped plate, preventing overload damage to a single adjustment device and improving the overall load-bearing capacity of the support unit.
[0030] Furthermore, the two ends of the horizontal arc plate 6.6 are welded to the connecting end plate A6.2 and the connecting end plate B6.3, respectively.
[0031] Furthermore, referring to Figure 2 , Figure 3 and Figure 4 The tilt adjustment device 7 includes an outer tube 8, a tail screw 11, a smooth rod 12, a front screw 13, and a lifting slide rod 14. The upper part of the outer tube 8 passes through the through hole 6.7, and a connecting ring 9 is integrally provided on the outer wall of the upper part of the outer tube 8. The connecting ring 9 is fixedly connected to the horizontal arc plate 6.6 by a third connecting bolt assembly 10. The upper inner part of the outer tube 8 is provided with a threaded hole A15 for threaded connection with the tail screw 11, and the lower inner part of the outer tube 8 is provided with a threaded hole A15 for threaded connection with the tail screw 11. A guide hole 17 is provided to mate with the lifting slide rod 14. The guide hole 17 has a square cross-section. The upper part of the lifting slide rod 14 is provided with a threaded hole B16 to mate with the front screw 13. The tail screw 11 and the front screw 13 are connected by a smooth rod 12. The threaded holes A15 and B16 have the same direction of rotation. The tail screw 11 and the front screw 13 have a first external thread and a second external thread, respectively. The lead of the first external thread is greater than the lead of the second external thread. By using differential screw drive, the lifting slide rod 14 can be adjusted in a small amount, thereby enabling fine adjustment of the level of the thrust bearing 3. This meets the core requirements of "high precision and small step distance" for the level adjustment of the thrust bearing 3, avoiding the accuracy deviation problem caused by excessive adjustment step distance.
[0032] Furthermore, the lead of the first external thread is 1.5 mm, and the lead of the second external thread is 1.25 mm.
[0033] Furthermore, the tail screw 11, the smooth rod 12, and the front screw 13 are integrally formed.
[0034] Furthermore, the bottom end of the lifting slide rod 14 is hemispherical, and the bottom end of the lifting slide rod 14 is inserted into the connecting groove of the support foot 18. The upper end of the tail screw 11 has an external hexagonal bolt head 4, which cooperates with the corresponding wrench to facilitate driving the tail screw 11 to rotate. The tail screw 11 drives the front screw 13 to rotate through the smooth rod 12. The tail screw 11 cooperates with the threaded hole A15 on the outer sleeve 8, and the front screw 13 cooperates with the threaded hole B16 on the lifting slide rod 14. When the tail screw 11 rotates one revolution, it drives the lifting slide rod 14 to move a distance equal to the difference between the lead of the first external thread and the lead of the second external thread.
[0035] Furthermore, after the bearing housing 1 is adjusted, an existing fixed base is set between the bearing housing 1 and the thrust bearing support plate 2. The bearing housing 1 is fixed to the thrust bearing support plate 2 by the fixed base. Finally, the thrust bearing support unit 6 can be removed and reused.
[0036] The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model is equipped with a tilt adjustment device on each thrust bearing support unit. The bottom end of the tilt adjustment device acts directly on the thrust bearing support plate, and the support height of the adjustment device can be changed by rotating the adjustment component of the tilt adjustment device.
[0037] The auxiliary construction device for the bearing of the rotary air preheater in a power plant boiler described in this utility model, because the thrust bearing support units are equidistantly distributed along the bearing centerline, can accurately correct the horizontal deviation of the thrust bearing by independently adjusting one or more tilt fine-tuning devices. Specifically, when a tilt in a certain direction is detected, raising the corresponding side fine-tuning device or lowering the opposite side device gradually brings the bearing housing and thrust bearing to the designed horizontal accuracy, ensuring uniform contact between the bearing rolling elements and the raceway, and meeting the concentricity requirements for high-speed operation of rotary equipment.
[0038] The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model has a uniform spacing between adjacent side plates, providing sufficient and regular operating space for the installation and disassembly of the thrust bearing support unit.
[0039] The auxiliary construction device for the bearing of the rotary air preheater of the power plant boiler described in this utility model utilizes differential screw transmission to enable the lifting slide bar to achieve micro-adjustment, thereby achieving fine adjustment of the level of the thrust bearing, meeting the requirements for fine adjustment of the level of the thrust bearing, and avoiding the problem of accuracy deviation caused by excessive adjustment step.
[0040] The foregoing has shown and described 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 the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
[0041] Any aspects of this invention not described in detail are well-known to those skilled in the art.
Claims
1. An auxiliary construction device for bearings in a rotary air preheater of a power plant boiler, comprising a bearing housing, wherein a thrust bearing is installed within the bearing housing, characterized in that: Multiple sets of side plates are spaced apart on the outer wall of the bearing housing. The multiple sets of side plates are arranged around the center line of the thrust bearing and the included angle between adjacent sets is equal. A thrust bearing support unit is detachably installed between two sets of adjacent side plates. A tilt adjustment device is installed on the thrust bearing support unit. The bottom end of the tilt adjustment device is supported on the thrust bearing support plate below the bearing housing.
2. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 1, characterized in that, The side plates are provided in four sets, namely the first side plate, the second side plate, the third side plate and the fourth side plate. The first side plate, the second side plate, the third side plate and the fourth side plate are all welded to the outer wall of the thrust bearing. The first side plate, the second side plate, the third side plate and the fourth side plate are arranged around the vertical center line of the thrust bearing and the included angle between adjacent ones is 90 degrees.
3. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 2, characterized in that, A set of thrust bearing support units is detachably installed between the first side plate and the second side plate, between the second side plate and the third side plate, between the third side plate and the fourth side plate, and between the fourth side plate and the first side plate.
4. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 3, characterized in that, The thrust bearing support unit includes a vertical arc-shaped plate attached to the outer wall of the bearing housing. Connecting end plate A and connecting end plate B are integrally formed on both sides of the vertical arc-shaped plate. Connecting end plate A and connecting end plate B are detachably connected to the corresponding side plates by a first connecting bolt and a second connecting bolt, respectively. A horizontal arc-shaped plate is provided on the outer wall of the middle part of the vertical arc-shaped plate. Multiple sets of tilt adjustment devices are installed on the horizontal arc-shaped plate. Through holes that cooperate with the tilt adjustment devices are opened on the horizontal arc-shaped plate.
5. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 4, characterized in that, The two ends of the horizontal arc-shaped plate are welded to connecting end plate A and connecting end plate B, respectively.
6. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 5, characterized in that, The tilt adjustment device includes an outer tube, a tail screw, a smooth rod, a front screw, and a lifting slide rod. The upper part of the outer tube passes through a through hole, and a connecting ring is integrally provided on the outer wall of the upper part of the outer tube. The connecting ring is fixedly connected to a horizontal arc plate by a third connecting bolt assembly. The upper inner part of the outer tube is provided with a threaded hole A that is threaded to the tail screw. The lower inner part of the outer tube is provided with a guide hole that mates with the lifting slide rod. The guide hole has a square cross-section. The upper part of the lifting slide rod is provided with a threaded hole B that mates with the front screw. The tail screw and the front screw are connected by a smooth rod. The threaded holes A and B have the same direction of rotation. The tail screw and the front screw have a first external thread and a second external thread, respectively. The lead of the first external thread is greater than the lead of the second external thread.
7. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 6, characterized in that, The tail screw, the smooth rod, and the front screw are integrally formed.
8. The auxiliary construction device for bearings of a power plant boiler rotary air preheater according to claim 7, characterized in that, The bottom end of the lifting slide rod is hemispherical, and the bottom end of the lifting slide rod is inserted into the connecting groove of the support foot. The upper end of the tail screw has an external hexagonal bolt head.