High-stability bearing housing and flue gas turbine

Abstract

The invention relates to the technical field of bearing boxes, in particular to a high-stability bearing box and a flue gas turbine. The invention provides a high-stability bearing box body which comprises a bearing seat and a bearing box cover covering the bearing seat, and two cylinder parts used for rotatably installing bearings are formed between the bearing seat and the bearing box cover. The bearing box body is arranged to be of the two cylindrical structures, the vibration absorption capacity and the deformation resistance capacity can be enhanced, and therefore the stability of the bearing box body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing housings, and in particular to a high-stability bearing housing and a flue gas turbine. Background Art

[0002] The flue gas turbine is a key equipment in the regeneration flue gas energy recovery system of the catalytic cracking unit in the oil refining process. It works in a harsh working environment at a high temperature of 600-760℃ and in corrosive oil flue gas. The bearing housing of the flue gas turbine is an important part of the flue gas turbine. The flue gas turbine rotor transmits the alternating stress generated by the axial thrust, the weight of the rotor itself, the operating vibration, and various external impact loads to the bearing housing through the bearing. Therefore, the bearing housing must have sufficient rigidity and stability.

[0003] The original structure of the flue gas turbine bearing box adopts a straight-through type or structural design up and down, and a rectangular structure design at the front and back. This structural design has problems such as small box stiffness margin, weak thermal shock resistance, and poor self-stability; secondly, due to the narrow space of the volute inside the shell, the front side of the bearing box extends into the inner volute, resulting in a narrow installation and maintenance space; and due to the poor air convection in the volute, the temperature difference between the front side of the box and the rear side of the bearing box is relatively high, and the box thermal expansion causes the rotor to lift up, affecting the normal operation of the smoke machine. In severe cases, it will also cause dynamic and static friction and lead to shutdown accidents. In view of the above three situations, it is necessary to design a high-stability bearing box.

[0004] The utility model patent with the authorization announcement number CN201461004U discloses a flue gas turbine tower bearing housing, the upper part of the housing inner cavity is the flue gas turbine rotor installation room, the lower part of the housing inner cavity is the oil collection chamber, the bottom wall of the oil collection chamber is a horizontal plane, the front side wall is a plumb plane, the rear side wall is an inclined plane, and the left and right side walls are inclined planes and symmetrical to the center line of the bearing housing. When the bearing housing is subjected to compression or shear stress, stress concentration may occur at the four corners, which may cause local deformation. Based on this, the existing technology still needs to be improved. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a high-stability bearing housing, and a flue gas turbine used in conjunction with the high-stability bearing housing, so as to at least solve the problem of structural instability of the existing bearing housing.

[0006] The invention provides a high-stability bearing housing, which comprises a bearing seat and a bearing housing cover covering the bearing seat, wherein two cylindrical parts for rotatably mounting the bearing are formed between the bearing seat and the bearing housing cover.

[0007] Further, the two cylindrical parts include a first cylindrical part and a second cylindrical part; the bearing housing includes a first semi-cylindrical part and a first arcuate cylinder. The first semi-cylindrical part is arranged on the front side of the first arcuate cylinder. The diameter of the first arcuate cylinder is larger than that of the first semi-cylindrical part, and the bottom of the first arcuate cylinder is lower than the bottom of the first semi-cylindrical part; the bearing housing cover includes a second semi-cylindrical part and a second arcuate cylinder. The second semi-cylindrical part cooperates with the first semi-cylindrical part to form the first cylindrical part; the second arcuate cylinder cooperates with the first arcuate cylinder to form the second cylindrical part.

[0008] Further, the high-stability bearing housing further includes a support frame, and the support frame includes a support part and a lower bottom plate; the support part is arranged below the first arcuate cylinder and is used for supporting the first arcuate cylinder; the lower bottom plate is arranged at the bottom of the support part and extends to the front, rear, left, and right sides of the support part. The projection of the lower bottom plate in the up-down direction is outside the projection plane of the first arcuate cylinder in the up-down direction.

[0009] Further, the high-stability bearing housing further includes an oil inlet pipe, and the oil inlet pipe is arranged inside the bearing housing. The oil inlet end of the oil inlet pipe penetrates through the first arcuate cylinder and extends to the outside of the first arcuate cylinder.

[0010] Further, an oil drain port is arranged at the bottom of the first arcuate cylinder. The high-stability bearing housing further includes an oil drain pipe, and the oil drain pipe is arranged below the first arcuate cylinder and is communicated with the oil drain port.

[0011] Further, the high-stability bearing housing further includes an aerosol heat insulation structure, and the aerosol heat insulation structure is arranged on the front side of the first arcuate cylinder and below the first semi-cylindrical part.

[0012] Further, the high-stability bearing housing further includes a vibration monitoring element, and the vibration monitoring element and its extended connection line are built inside the bearing housing.

[0013] Further, the support part includes a left side plate and a right side plate that are symmetrically arranged with respect to a reference vertical plane. The reference vertical plane passes through the axis of the first arcuate cylinder; the lower ends of the left side plate and the right side plate are fixed to the lower bottom plate, and the upper ends of the left side plate and the right side plate are fixed to the first arcuate cylinder; the distance from the upper ends of the left side plate and the right side plate to the reference vertical plane is less than the distance from the lower ends of the left side plate and the right side plate to the reference vertical plane, and the lower ends of the left side plate and the right side plate extend to the outside of the projection plane of the first arcuate cylinder in the up-down direction; the oil drain pipe penetrates through the left side plate or the right side plate.

[0014] Further, a plurality of air heat exchange holes are arranged on both the left side plate and the right side plate.

[0015] Further, the support part further includes an inner support plate; the inner support plate is arranged on the reference vertical plane, and both sides of the inner support plate are connected to the lower bottom plate through stabilizing members.

[0016] Furthermore, a plurality of reinforcing ribs for facilitating the support of the first semi-cylindrical tube are provided at the connection between the first semi-cylindrical tube and the first arcuate tube.

[0017] A gas turbine of the present invention includes the above-mentioned high-stability bearing housing.

[0018] Furthermore, the front end of the lower bottom plate of the high-stability bearing housing includes two horizontally arranged anchor claws; mounting channels for facilitating the passing through and fixing of the anchor claws are provided on the left and right sides of the gas turbine.

[0019] The beneficial effects of the present invention are as follows: By setting the bearing housing into two cylindrical structures, the present invention can enhance the vibration absorption ability and the resistance to deformation. Since the cross-sectional moment of inertia of the cylindrical structure is larger than that of other shapes, this means that when subjected to an external torque, the cylindrical housing can more effectively disperse and resist this torque, thereby reducing the deformation of the bearing housing and improving the stability of the bearing housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Fig. shows a side cross-sectional view of a high-stability bearing housing provided by an embodiment of the present invention;

[0021] Figure 2 Fig. shows a front view of a high-stability bearing housing provided by an embodiment of the present invention;

[0022] Figure 3 Fig. shows a rear view of a high-stability bearing housing provided by an embodiment of the present invention;

[0023] Figure 4 Fig. shows a top view of a bearing seat of a high-stability bearing housing provided by an embodiment of the present invention;

[0024] Figure 5 Fig. shows a bottom view of a bearing housing cover of a high-stability bearing housing provided by an embodiment of the present invention;

[0025] Figure 6 Fig. shows a side view of a bearing housing cover of a high-stability bearing housing provided by an embodiment of the present invention.

[0026] DESCRIPTION OF THE REFERENCE NUMERALS:

[0027] 1. First semi-cylindrical tube; 2. First arcuate tube; 3. Second semi-cylindrical tube; 4. Second arcuate tube; 5. Lower bottom plate; 6. Oil inlet pipe; 7. Oil drain port; 8. Oil drain pipe; 9. Aerosol heat insulation structure; 10. Vibration monitoring element; 11. Left side plate; 12. Air heat exchange hole; 13. Inner support plate; 14. Reinforcing rib; 15. Anchor claw; 16. Bearing support; 17. Front side plate; 18. Horizontal cross plate; 19. Support vertical plate; 20. Split surface flange edge; 21. Right side plate; 22. Rear side plate. Detailed implementation mode

[0028] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments of the present invention are described in detail, those skilled in the art can easily understand that various modifications are feasible without substantially departing from the teachings of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other substitutions, modifications, variations and deletions can be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0029] As Figures 1 to 6 shown, an embodiment of the present invention provides a high-stability bearing housing, including: a bearing seat and a bearing cover covering above the bearing seat, and two cylindrical portions for rotatably mounting a bearing are formed between the bearing seat and the bearing cover. Compared with the prior art, the bearing housing of the present invention is set into two cylindrical structures, which can enhance the vibration absorption ability and the deformation resistance ability. Since the sectional moment of inertia of the cylindrical structure is larger than that of other shapes, this means that when subjected to an external torque, the cylindrical housing can more effectively disperse and resist this torque, thereby reducing deformation.

[0030] In some embodiments, the two cylindrical portions include a first cylindrical portion and a second cylindrical portion; the bearing seat includes a first semi-cylindrical body 1 and a first arcuate cylinder 2, the first semi-cylindrical body 1 is arranged on the front side of the first arcuate cylinder 2, the diameter of the first arcuate cylinder 2 is larger than that of the first semi-cylindrical body 1, and the bottom of the first arcuate cylinder 2 is lower than the bottom of the first semi-cylindrical body 1. The bearing cover includes a second semi-cylindrical body 3 and a second arcuate cylinder 4, the second semi-cylindrical body 3 and the first semi-cylindrical body 1 cooperate to form the first cylindrical portion; the second arcuate cylinder 4 and the first arcuate cylinder 2 cooperate to form the second cylindrical portion. The first arcuate cylinder 2 is a superior arcuate cylinder with a central angle greater than 180°, and the second arcuate cylinder 4 is an inferior arcuate cylinder with a central angle less than 180°. A bearing support 16 is arranged on both the first semi-cylindrical body 1 and the first arcuate cylinder 2, and both ends of the bearing are rotatably mounted on a bearing support 16. A support cavity for accommodating the bearing support 16 is arranged on both the second semi-cylindrical body 3 and the second arcuate cylinder 4. A split surface flange 20 is arranged on the circumferences of the mounting end faces of the first semi-cylindrical body 1, the second semi-cylindrical body 3, the first arcuate cylinder 2 and the second arcuate cylinder 4, through holes for facilitating the installation of fastening bolts are arranged on the split surface flange 20, and the bearing seat and the bearing cover are fixedly connected by bolts and nuts.

[0031] In some embodiments, the high-stability bearing housing further includes a support frame, and the support frame includes a support portion and a lower base plate 5. The support portion is disposed below the first arcuate cylinder 2 for supporting the first arcuate cylinder 2; the lower base plate 5 is disposed at the bottom of the support portion and extends towards the front and rear sides and the left and right sides of the support portion. The projection of the lower base plate 5 in the vertical direction is outside the projection plane of the first arcuate cylinder 2 in the vertical direction. By providing the lower base plate 5, the present invention ensures that the overall center of gravity of the rotor and the bearing housing falls within the bottom surface of the bearing housing, greatly enhancing the stability of the bearing housing and significantly improving the stability of the bearing housing.

[0032] In some embodiments, as Figure 4 shown, the high-stability bearing housing further includes an oil inlet pipe 6. The oil inlet pipe 6 conveys lubricating oil from the oil tank to the bearing to achieve lubrication and cooling of the bearing, reduce friction, and extend the service life of the bearing. The oil inlet pipe 6 is disposed inside the bearing seat. The oil inlet end of the oil inlet pipe 6 penetrates through the first arcuate cylinder 2 and extends to the outside of the first arcuate cylinder 2. A seal is provided at the connection position between the oil inlet pipe 6 and the first arcuate cylinder 2 to prevent lubricating oil leakage. The present invention changes the original external bearing oil inlet pipe 6 to an internal structure, eliminating the safety hazard that the external oil inlet pipe 6 is vulnerable to corrosion by high-temperature flue gas and cracking, and the lubricating oil may leak and cause a fire.

[0033] In some embodiments, an oil drain port 7 is provided at the bottom of the first arcuate cylinder 2. The high-stability bearing housing further includes an oil drain pipe 8. The main function of the oil drain pipe 8 is to drain the used lubricating oil to reduce the accumulation of lubricating oil and prevent the normal operation of the equipment due to excessive lubricating oil. In addition, in certain specific situations, such as when the bearing overheats, the high-temperature lubricating oil can also be drained in time through the oil drain pipe 8 to avoid further damage to the equipment. The oil drain pipe 8 is disposed below the first arcuate cylinder 2 and is communicated with the oil drain port 7 to prevent the oil drain pipe 8 from being vulnerable to corrosion by high-temperature flue gas and cracking and facilitating the drainage of the converged lubricating oil. Specifically, a seal ring for preventing lubricating oil leakage is also provided at the connection position between the oil drain pipe 8 and the oil drain port 7.

[0034] In some embodiments, the high-stability bearing housing further includes an aerosol heat insulation structure 9, which is disposed on the front side of the first arcuate cylinder 2 and below the first semi-cylindrical cylinder 1. When the gas turbine is operating normally, the high-temperature flue gas at 700 °C passes through the gas turbine, and part of the heat heats the volute. The volute heats the front end of the bearing housing closest to it by means of thermal radiation, so that the temperature difference between the front end and the rear end of the bearing housing reaches 60-70 °C. Due to the large temperature difference between the front and rear ends of the bearing housing, the thermal expansion at both ends is different, and the thermal expansion of the front end of the bearing housing is greater than that of the rear end. The elevations of the front and rear bearings in the bearing housing are also different, with the front bearing being higher than the rear bearing, and the two sets of bearings cannot be kept on the same horizontal line. The rotor is installed on the two sets of bearings, and the front bearing heats up relatively, which causes the phenomenon of rotor lifting, which is called by professionals in this field. If the rotor lifting exceeds a certain range, it will seriously affect the normal operation of the gas turbine, such as causing friction between the gas seal and the rotor; causing collisions between the disk and the housing, and accelerating the damage of the two sets of bearings. The present invention adopts the aerosol heat insulation structure 9, which can suppress the phenomenon of rotor lifting, and can eliminate the problem of heat insulation failure caused by water corrosion and leakage, greatly improving the heat insulation and heat preservation effect. Since the aerosol heat insulation structure 9 is lighter in weight than the existing cooling water jacket structure, it can greatly reduce the weight of the front bearing housing and improve the stability of the bearing housing.

[0035] In some embodiments, the high-stability bearing housing further includes a vibration monitoring element 10 for detecting the working state of the bearing. The vibration monitoring element 10 and its extended connection line are built into the bearing seat. Compared with the prior art in which the vibration monitoring element 10 is arranged outside the bearing housing, it can prevent damage to the vibration monitoring element 10 by high-temperature flue gas and improve the monitoring reliability of the bearing.

[0036] In some embodiments, the support portion includes a left side plate 11 and a right side plate 21 symmetrically arranged with respect to a reference vertical plane. The reference vertical plane passes through the axis of the first arcuate cylinder 2. The lower ends of the left side plate 11 and the right side plate are fixed to the lower bottom plate 5, and the upper ends of the left side plate 11 and the right side plate 21 are fixed to the first arcuate cylinder 2 for supporting the bearing housing. The distance from the upper ends of the left side plate 11 and the right side plate 21 to the reference vertical plane is less than the distance from the upper ends of the left side plate 11 and the right side plate 21 to the reference vertical plane, and the lower ends of the left side plate 11 and the right side plate 21 extend to the outside of the vertical projection plane of the first arcuate cylinder 2 in the up and down direction, so that the support area of the left side plate 11 and the right side plate 21 for the bearing housing is large, greatly improving the stability of the bearing housing. The drain pipe 8 passes through the left side plate 11, facilitating the support for the drain pipe 8. Further, the support portion further includes a front side plate 17 and a rear side plate 22 provided on the front and rear sides and the lower part of the first arcuate cylinder 2. The upper end of the front side plate 17 is fixedly connected to the front outer wall of the first arcuate cylinder 2 and the middle flange edge 20 on both sides of the first semi-cylindrical tube 3, and the upper end of the rear side plate 22 is fixedly connected to the rear outer wall of the first arcuate cylinder 2 and the middle flange edge 20 on both sides of the first arcuate cylinder 2. The lower ends of the front side plate 17 and the rear side plate 22 are connected to the lower bottom plate 5 to further support the bearing housing.

[0037] In some embodiments, a plurality of air heat exchange holes 12 are provided on each of the left side plate 11, the right side plate 21, the front side plate 17, and the rear side plate 22. The provision of the plurality of air heat exchange holes 12 is for dissipating heat from the bearing housing, further effectively reducing the operating temperature of the bearing.

[0038] In some embodiments, the support portion further includes an inner support plate 13; the inner support plate 13 is arranged on the reference vertical plane, and both sides of the inner support plate 13 are connected to the lower bottom plate 5 through stabilizing members. Specifically, the stabilizing members include a horizontal cross plate 18 and two support vertical plates 19 provided below the horizontal cross plate 18 for supporting the horizontal cross plate 18, so as to enhance the structural stability of the inner support plate 13 and further improve the stability of the bearing housing.

[0039] In some embodiments, a plurality of reinforcing ribs 14 for facilitating the support of the first semi-cylindrical tube 1 are provided at the connection between the first semi-cylindrical tube 1 and the first arcuate cylinder 2 to improve the structural stability of the first semi-cylindrical tube 1.

[0040] The present invention also provides a gas turbine including the high-stability bearing housing described in any one of the above embodiments.

[0041] In some embodiments, the front end of the lower bottom plate 5 of the high-stability bearing housing includes two horizontally arranged anchor claws 15; mounting channels for facilitating the passing through and fixing of the anchor claws 15 are provided on the left and right sides of the gas turbine, so as to facilitate the cooperation with the high-stability bearing housing.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention; any modifications or equivalent replacements made to the present invention without departing from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A highly stable bearing housing, characterized in that, Comprising: A bearing housing and a bearing housing cover covering above the bearing housing, and two cylindrical parts for rotatably mounting a bearing are formed between the bearing housing and the bearing housing cover.

2. The highly stable bearing housing according to claim 1, wherein The two cylindrical parts include a first cylindrical part and a second cylindrical part; the bearing housing includes a first semi-cylindrical part (1) and a first arcuate cylinder (2), the first semi-cylindrical part (1) is arranged on the front side of the first arcuate cylinder (2), the diameter of the first arcuate cylinder (2) is larger than the diameter of the first semi-cylindrical part (1), and the bottom of the first arcuate cylinder (2) is lower than the bottom of the first semi-cylindrical part (1); the bearing housing cover includes a second semi-cylindrical part (3) and a second arcuate cylinder (4), the second semi-cylindrical part (3) cooperates with the first semi-cylindrical part (1) to form the first cylindrical part; the second arcuate cylinder (4) cooperates with the first arcuate cylinder (2) to form the second cylindrical part.

3. The high-stability bearing housing according to claim 2, wherein It further includes a support frame, and the support frame includes a support part and a lower bottom plate (5); the support part is arranged below the first arcuate cylinder (2) for supporting the first arcuate cylinder (2); the lower bottom plate (5) is arranged at the bottom of the support part and extends to the front, rear, left and right sides of the support part, and the projection of the lower bottom plate (5) in the up and down direction is outside the projection plane of the first arcuate cylinder (2) in the up and down direction.

4. The highly stable bearing housing according to claim 2, wherein It further includes an oil inlet pipe (6), the oil inlet pipe (6) is arranged inside the bearing housing, and the oil inlet end of the oil inlet pipe (6) penetrates through the first arcuate cylinder (2) and extends to the outside of the first arcuate cylinder (2).

5. The highly stable bearing housing according to claim 3, characterized in that, An oil drain port (7) is arranged at the bottom of the first arcuate cylinder (2), and the high-stability bearing housing further includes an oil drain pipe (8), the oil drain pipe (8) is arranged below the first arcuate cylinder (2) and is communicated with the oil drain port (7).

6. The high-stability bearing housing according to claim 2, characterized in that, It further includes an aerosol heat insulation structure (9), and the aerosol heat insulation structure (9) is arranged on the front side of the first arcuate cylinder (2) and below the first semi-cylindrical part (1).

7. The highly stable bearing housing according to claim 1, characterized in that, It further includes a vibration monitoring element (10), and the vibration monitoring element (10) and its extended connection line are built inside the bearing housing.

8. The high-stability bearing housing according to claim 5, characterized in that, The support part includes a left side plate (11) and a right side plate (21) symmetrically arranged with respect to a reference vertical plane, and the reference vertical plane passes through the axis of the first arcuate cylinder (2); the lower ends of the left side plate (11) and the right side plate (21) are fixed to the lower bottom plate (5), and the upper ends of the left side plate (11) and the right side plate (21) are fixed to the first arcuate cylinder (2); the distance from the upper ends of the left side plate (11) and the right side plate (21) to the reference vertical plane is less than the distance from the lower ends of the left side plate (11) and the right side plate (21) to the reference vertical plane, and the lower ends of the left side plate (11) and the right side plate (21) extend to the outside of the projection plane of the first arcuate cylinder (2) in the up and down direction; the oil drain pipe (8) penetrates through the left side plate (11) or the right side plate (21).

9. The high-stability bearing housing according to claim 8, wherein, A plurality of air heat exchange holes (12) are arranged on both the left side plate (11) and the right side plate (21).

10. The highly stable bearing housing according to claim 8, characterized in that, The supporting part further includes an inner support plate (13); the inner support plate (13) is arranged on the reference vertical plane, and both sides of the inner support plate (13) are connected to the lower bottom plate (5) through stabilizing members.

11. The high-stability bearing housing according to claim 2, wherein, A plurality of reinforcing ribs (14) for facilitating the support of the first semi-cylindrical barrel (1) are arranged at the connection of the first semi-cylindrical barrel (1) and the first arcuate barrel (2).

12. A gas turbine, characterized in that, It includes the high-stability bearing housing according to any one of claims 1 to 11.

13. The gas turbine according to claim 12, wherein The front end of the lower bottom plate (5) of the high-stability bearing housing includes two horizontally arranged anchor claws (15); installation channels for facilitating the passing through and fixing of the anchor claws (15) are arranged on the left and right sides of the gas turbine.

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