A guide bearing inner circulation structure

Abstract

The application discloses a guide bearing inner circulation structure and belongs to the technical field of generators, which comprises an oil tank, a cooler, a bearing seat, guide bearing pads and a sliding rotor, and is characterized in that it further comprises a viscous pump plate and a guide pad support ring, the viscous pump plate is fixed at the bottom of the guide pad support ring, the viscous pump plate corresponds to the lower plane of the sliding rotor, an oil collecting cavity is arranged on the guide pad support ring, a plurality of radial oil guiding holes are arranged on the outer side of the oil collecting cavity, the radial oil guiding holes are communicated with the oil collecting cavity, an oil injection pipe is arranged between two adjacent guide bearing pads, the upper part of the radial oil guiding hole is communicated with the oil injection pipe, and a drain port is formed on the bearing seat. The application circulates lubricating oil by using the viscous pump principle, directly introduces the lubricating oil into the cooler through the drain port formed at the rear end of the bearing seat, greatly shortens the lubricating oil path, adopts the direct injection lubrication structure for the lubrication of the guide bearing pad, effectively improves the cooling effect and the cooling efficiency of the guide bearing pad, and has a good inhibitory effect on the generation of oil groove oil mist.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and more particularly to a guide bearing internal circulation structure. Background Technology

[0002] Guide bearings typically employ an internal circulation lubrication method. This involves placing an oil guide ring under the sliding rotor to guide oil through the gap between the two bearing shells, causing the oil to circulate out from behind the bearing shells and then be cooled by a cooler for further lubrication. However, because the oil passage between the bearing shells is uncontrolled, the lubricating oil experiences severe turbulence. Oil mist accumulation in the oil sump can easily cause oil mist to overflow, thus contaminating the stator and rotor.

[0003] Chinese patent document CN205173221U, published on April 20, 2016, discloses a mixed-flow turbine guide bearing, comprising a bearing body and tilting pads disposed on the bearing body. The tilting pads are located between the bearing body and the rotating shaft. The tilting pads are provided with a Babbitt alloy layer, which cooperates with the rotating shaft. Two adjacent tilting pads, the rotating shaft, and the bearing body form a cavity. The cavity is characterized by: a nozzle being provided within it; the bearing body having a mounting hole for mounting the nozzle, which is connected to an external oil supply circuit; the nozzle having an oil spray hole for spraying lubricating oil, which is perpendicular to the rotating shaft, and the axis of the oil spray hole is in the same plane as the axis of the rotating shaft; and the Babbitt alloy layer of the tilting pads having several parallel arc-shaped oil grooves located between the Babbitt alloy layer and the rotating shaft, each arc-shaped oil groove being parallel or coplanar with the cross-section of the rotating shaft, with both ends of the arc-shaped oil groove penetrating the Babbitt alloy layer.

[0004] The mixed-flow turbine guide bearing disclosed in this patent document can promptly discharge the lubricant located between the shaft and the Babbitt alloy layer, and can increase the actual amount of lubricating oil entering the area between the shaft and the Babbitt alloy layer, thereby reducing the bearing temperature. However, the lubrication method and lubrication path are suboptimal, affecting the cooling effect and cooling efficiency.

[0005] Chinese patent document CN211449422U, published on September 8, 2020, discloses a sliding bearing with an oil passage device. The bearing is characterized by comprising a cooling device and a thrust head, thrust bearing pad, and pressure plate sleeved outside the rotating shaft. The thrust head includes an integrally connected large end and a small end. The two end faces of the large end are respectively connected to the thrust bearing pad and the pressure plate. There is a first gap between the large end and the thrust bearing pad, and a second gap between the large end and the pressure plate. The cooling device is located inside an oil tank containing lubricating oil. The cooling device includes an outer partition and multiple cooling pipes. The outer partition forms a space with an inlet and outlet connected to the oil tank. The multiple cooling pipes are located within the space enclosed by the outer partition. One end of the first gap and one end of the second gap are both connected to the space enclosed by the outer partition. The other ends of the first gap and the other ends of the second gap are both connected to the oil tank through channels opened on the bearing.

[0006] The patent document discloses a sliding bearing with an oil passage device. When the thrust head rotates, the thrust head and pressure plate rotate relative to each other, and the thrust head and thrust bearing rotate relative to each other, forming two planar viscous pumps that provide driving force. This causes lubricating oil to flow along the first and second oil passages, with the flow direction from the first or second gap towards the oil tank, thus lubricating and cooling the sliding bearing. However, the lubricating oil path is poor, affecting the cooling effect and failing to effectively suppress the generation of oil mist in the oil tank. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, this invention provides an internal circulation structure for a guide bearing. This invention circulates lubricating oil by setting an oil spray pipe between the guide bearing pads and utilizing the principle of a viscous pump. The lubricating oil is directly introduced into the cooler through an oil drain port at the rear end of the bearing housing, which greatly shortens the lubricating oil path. At the same time, the guide bearing pad lubrication adopts a direct injection lubrication structure, which effectively improves the cooling effect and efficiency of the guide bearing pads and also has a good suppressive effect on the generation of oil mist in the oil sump.

[0008] This invention is achieved through the following technical solution:

[0009] An internal circulation structure for a guide bearing includes an oil tank, a cooler, a bearing housing, guide bearing pads, and a sliding rotor that rotates with the main shaft. The guide bearing pads are mounted on the bearing housing, which is mounted on the oil tank. The structure is characterized by further including a viscous pump plate and a guide bearing support ring. The viscous pump plate is fixed to the bottom of the guide bearing support ring and corresponds to the lower plane of the sliding rotor. The guide bearing support ring has an oil collecting chamber with its opening facing the sliding rotor. Multiple radial oil guide holes are provided on the outer side of the oil collecting chamber, communicating with the oil collecting chamber. An oil injection pipe is provided between two adjacent guide bearing pads, with the upper part of the radial oil guide holes communicating with the oil injection pipe. An oil drain port is provided on the bearing housing.

[0010] An oil baffle ring is provided between the upper part of the cooler and the guide bearing support ring.

[0011] The upper part of the oil collecting chamber is equipped with a labyrinth seal.

[0012] The number of radial oil guide holes is the same as the number of guide bearing shells.

[0013] The oil drain port is located above the cooler.

[0014] The bottom of the oil tank is detachably connected to an oil trough chassis.

[0015] The beneficial effects of this invention are mainly reflected in the following aspects:

[0016] I. This invention comprises a viscous pump plate fixed to the bottom of a guide bearing support ring. The guide bearing support ring has an oil collection chamber with its opening facing the sliding rotor side. Multiple radial oil guide holes are located on the outer side of the oil collection chamber and communicate with it. An oil injection pipe is installed between two adjacent guide bearings, with the upper part of the radial oil guide holes connected to the oil injection pipe. An oil drain port is located on the bearing seat. Compared to existing technologies, by installing an oil injection pipe between the guide bearings, a gap viscous pump is formed by the relative movement between the lower plane of the sliding rotor and the viscous pump plate. The lubricating oil is circulated using the viscous pump principle, and the lubricating oil is directly introduced into the cooler through an oil drain port at the rear end of the bearing seat, greatly shortening the lubricating oil path. Simultaneously, the guide bearing lubrication adopts a direct injection lubrication structure, effectively improving the cooling effect and efficiency of the guide bearings and also effectively suppressing the generation of oil mist in the oil sump.

[0017] Second, in this invention, an oil baffle ring is provided between the upper part of the cooler and the guide bearing support ring, which can fully cool the lubricating oil and improve the cooling effect of the guide bearing.

[0018] Third, in this invention, a labyrinth seal is provided at the upper part of the oil collecting chamber, which has a good sealing effect and can effectively prevent insufficient oil supply between the bearings due to insufficient pressure of the viscous pump.

[0019] Fourth, in this invention, the number of radial oil guide holes is the same as the number of guide bearing shells, which helps to ensure the cooling effect of each guide bearing shell.

[0020] Fifth, in this invention, the oil drain port is located above the cooler, which can quickly introduce lubricating oil into the cooler, shorten the lubricating oil circulation path, and help improve the cooling efficiency of the guide bearing shell.

[0021] VI. In this invention, the bottom of the oil tank is detachably connected to an oil trough chassis, which facilitates cleaning, maintenance, disassembly, and replacement. Attached Figure Description

[0022] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] The markings in the diagram are: 1. Oil tank, 2. Cooler, 3. Bearing housing, 4. Guide bearing shell, 5. Main shaft, 6. Sliding rotor, 7. Stick pump plate, 8. Guide bearing support ring, 9. Oil collection chamber, 10. Radial oil guide hole, 11. Oil injection pipe, 12. Oil drain port, 13. Oil baffle ring, 14. Labyrinth seal, 15. Oil tank chassis. Detailed Implementation

[0026] Example 1

[0027] See Figure 1 and Figure 2 A guide bearing internal circulation structure includes an oil tank 1, a cooler 2, a bearing housing 3, a guide bearing shell 4, and a sliding rotor 6 that rotates with a main shaft 5. The guide bearing shell 4 is mounted on the bearing housing 3, which is mounted on the oil tank 1. The structure also includes a viscous pump plate 7 and a guide bearing support ring 8. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8 and corresponds to the lower plane of the sliding rotor 6. The guide bearing support ring 8 is provided with an oil collecting chamber 9, the opening of which faces the sliding rotor 6. The outer side of the oil collecting chamber 9 is provided with multiple radial oil guiding holes 10, which communicate with the oil collecting chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing shells 4, and the upper part of the radial oil guiding hole 10 is connected to the oil injection pipe 11. The bearing housing 3 has an oil drain port 12.

[0028] This embodiment is the most basic implementation. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8. The guide bearing support ring 8 is provided with an oil collection chamber 9. The opening of the oil collection chamber 9 faces the sliding rotor 6. Multiple radial oil guide holes 10 are provided on the outer side of the oil collection chamber 9. The radial oil guide holes 10 are connected to the oil collection chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing pads 4. The upper part of the radial oil guide hole 10 is connected to the oil injection pipe 11. An oil drain port 12 is opened on the bearing seat 3. Compared with the prior art, by setting the oil injection pipe 11 between the guide bearing pads 4, the relative movement between the lower plane of the sliding rotor 6 and the viscous pump plate 7 forms a gap viscous pump. The lubricating oil is circulated using the principle of the viscous pump. The lubricating oil is directly introduced into the cooler 2 through the oil drain port 12 at the rear end of the bearing seat 3, which greatly shortens the lubricating oil path. At the same time, the lubrication of the guide bearing pads 4 adopts a direct injection lubrication structure, which effectively improves the cooling effect and cooling efficiency of the guide bearing pads 4 and also has a good suppressive effect on the generation of oil mist in the oil tank.

[0029] Example 2

[0030] See Figure 1 and Figure 2 A guide bearing internal circulation structure includes an oil tank 1, a cooler 2, a bearing housing 3, a guide bearing shell 4, and a sliding rotor 6 that rotates with a main shaft 5. The guide bearing shell 4 is mounted on the bearing housing 3, which is mounted on the oil tank 1. The structure also includes a viscous pump plate 7 and a guide bearing support ring 8. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8 and corresponds to the lower plane of the sliding rotor 6. The guide bearing support ring 8 is provided with an oil collecting chamber 9, the opening of which faces the sliding rotor 6. The outer side of the oil collecting chamber 9 is provided with multiple radial oil guiding holes 10, which communicate with the oil collecting chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing shells 4, and the upper part of the radial oil guiding hole 10 is connected to the oil injection pipe 11. The bearing housing 3 has an oil drain port 12.

[0031] An oil baffle ring 13 is provided between the upper part of the cooler 2 and the guide bearing support ring 8.

[0032] This embodiment is a preferred implementation. An oil baffle ring 13 is provided between the upper part of the cooler 2 and the guide bearing support ring 8, which can fully cool the lubricating oil and improve the cooling effect of the guide bearing bearing 4.

[0033] Example 3

[0034] See Figure 1 and Figure 2 A guide bearing internal circulation structure includes an oil tank 1, a cooler 2, a bearing housing 3, a guide bearing shell 4, and a sliding rotor 6 that rotates with a main shaft 5. The guide bearing shell 4 is mounted on the bearing housing 3, which is mounted on the oil tank 1. The structure also includes a viscous pump plate 7 and a guide bearing support ring 8. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8 and corresponds to the lower plane of the sliding rotor 6. The guide bearing support ring 8 is provided with an oil collecting chamber 9, the opening of which faces the sliding rotor 6. The outer side of the oil collecting chamber 9 is provided with multiple radial oil guiding holes 10, which communicate with the oil collecting chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing shells 4, and the upper part of the radial oil guiding hole 10 is connected to the oil injection pipe 11. The bearing housing 3 has an oil drain port 12.

[0035] An oil baffle ring 13 is provided between the upper part of the cooler 2 and the guide bearing support ring 8.

[0036] Furthermore, a labyrinth seal 14 is provided on the upper part of the oil collecting cavity 9.

[0037] This embodiment is another preferred implementation. A labyrinth seal 14 is provided on the upper part of the oil collecting chamber 9, which has a good sealing effect and can effectively prevent insufficient oil supply between the bearings due to insufficient pressure of the viscous pump.

[0038] Example 4

[0039] See Figure 1 and Figure 2 A guide bearing internal circulation structure includes an oil tank 1, a cooler 2, a bearing housing 3, a guide bearing shell 4, and a sliding rotor 6 that rotates with a main shaft 5. The guide bearing shell 4 is mounted on the bearing housing 3, which is mounted on the oil tank 1. The structure also includes a viscous pump plate 7 and a guide bearing support ring 8. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8 and corresponds to the lower plane of the sliding rotor 6. The guide bearing support ring 8 is provided with an oil collecting chamber 9, the opening of which faces the sliding rotor 6. The outer side of the oil collecting chamber 9 is provided with multiple radial oil guiding holes 10, which communicate with the oil collecting chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing shells 4, and the upper part of the radial oil guiding hole 10 is connected to the oil injection pipe 11. The bearing housing 3 has an oil drain port 12.

[0040] An oil baffle ring 13 is provided between the upper part of the cooler 2 and the guide bearing support ring 8.

[0041] The upper part of the oil collecting chamber 9 is provided with a labyrinth seal 14.

[0042] The number of radial oil guide holes 10 is the same as the number of guide bearing shells 4.

[0043] This embodiment is another preferred implementation. The number of radial oil guide holes 10 is the same as the number of guide bearing shells 4, which helps to ensure the cooling effect of each guide bearing shell 4.

[0044] Example 5

[0045] See Figure 1 and Figure 2 A guide bearing internal circulation structure includes an oil tank 1, a cooler 2, a bearing housing 3, a guide bearing shell 4, and a sliding rotor 6 that rotates with a main shaft 5. The guide bearing shell 4 is mounted on the bearing housing 3, which is mounted on the oil tank 1. The structure also includes a viscous pump plate 7 and a guide bearing support ring 8. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8 and corresponds to the lower plane of the sliding rotor 6. The guide bearing support ring 8 is provided with an oil collecting chamber 9, the opening of which faces the sliding rotor 6. The outer side of the oil collecting chamber 9 is provided with multiple radial oil guiding holes 10, which communicate with the oil collecting chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing shells 4, and the upper part of the radial oil guiding hole 10 is connected to the oil injection pipe 11. The bearing housing 3 has an oil drain port 12.

[0046] An oil baffle ring 13 is provided between the upper part of the cooler 2 and the guide bearing support ring 8.

[0047] The upper part of the oil collecting chamber 9 is provided with a labyrinth seal 14.

[0048] The number of radial oil guide holes 10 is the same as the number of guide bearing shells 4.

[0049] Furthermore, the oil drain port 12 is located above the cooler 2.

[0050] This embodiment is another preferred implementation. The oil drain port 12 is located above the cooler 2, which can quickly introduce lubricating oil into the cooler 2, shorten the lubricating oil circulation path, and help improve the cooling efficiency of the guide bearing 4.

[0051] Example 6

[0052] See Figure 1 and Figure 2 A guide bearing internal circulation structure includes an oil tank 1, a cooler 2, a bearing housing 3, a guide bearing shell 4, and a sliding rotor 6 that rotates with a main shaft 5. The guide bearing shell 4 is mounted on the bearing housing 3, which is mounted on the oil tank 1. The structure also includes a viscous pump plate 7 and a guide bearing support ring 8. The viscous pump plate 7 is fixed to the bottom of the guide bearing support ring 8 and corresponds to the lower plane of the sliding rotor 6. The guide bearing support ring 8 is provided with an oil collecting chamber 9, the opening of which faces the sliding rotor 6. The outer side of the oil collecting chamber 9 is provided with multiple radial oil guiding holes 10, which communicate with the oil collecting chamber 9. An oil injection pipe 11 is provided between two adjacent guide bearing shells 4, and the upper part of the radial oil guiding hole 10 is connected to the oil injection pipe 11. The bearing housing 3 has an oil drain port 12.

[0053] An oil baffle ring 13 is provided between the upper part of the cooler 2 and the guide bearing support ring 8.

[0054] The upper part of the oil collecting chamber 9 is provided with a labyrinth seal 14.

[0055] The number of radial oil guide holes 10 is the same as the number of guide bearing shells 4.

[0056] The oil drain port 12 is located above the cooler 2.

[0057] The bottom of the oil tank 1 is detachably connected to an oil trough chassis 15.

[0058] This embodiment is the best implementation method. The bottom of the oil tank 1 is detachably connected to the oil tank chassis 15, which facilitates cleaning, maintenance and disassembly replacement.

[0059] The principle of this invention is as follows:

[0060] A gap viscous pump is formed by the relative movement between the lower plane of the sliding rotor 6 and the viscous pump plate 7. The lubricating oil is pressurized by the viscous pump and reaches the oil collection chamber 9 below the guide bearing shell 4. The oil collection chamber 9 is set on the guide bearing support ring 8 and forms a U-shaped cavity with the viscous pump plate 7. The opening of the oil collection chamber 9 faces the sliding rotor 6. Several radial oil guide holes 10 are opened on the outer diameter side of the oil collection chamber 9 and are connected to the oil collection chamber 9. The number of radial oil guide holes 10 is the same as the number of guide bearing shells 4. The upper part of the radial oil guide holes 10 is connected to the oil spray pipe 11. The oil spray pipe 11 is set between adjacent guide bearing shells 4 so that the lubricating oil is directly sprayed onto the surface of the sliding rotor 6, thereby lubricating the guide bearing shell 4. Since the guide bearing shell 4 uses a direct spray lubrication structure, there is no need to store lubricating oil between the sliding rotor 6 and the bearing seat 3. An oil drain port 12 is set at the rear end of the bearing seat 3 to introduce the lubricating oil into the cooler 2, shortening the lubricating oil circulation path.

[0061] The specific oil circulation process of this invention is as follows:

[0062] The sliding rotor 6 rotates with the main shaft 5. The relative movement between the lower plane of the sliding rotor 6 and the viscous pump plate 7 forms a gap viscous pump. The lubricating oil is pressurized by the viscous pump to provide power for the oil circuit circulation. The lubricating oil reaches the oil collection chamber 9, and then enters the oil injection pipe 11 through the radial oil guide hole 10. The oil injection pipe 11 sprays onto the surface of the sliding rotor 6 to lubricate the guide bearing shell 4. Finally, the lubricating oil enters the cooler 2 through the oil outlet 12 at the rear end of the bearing seat 3. After being cooled by the cooler 2, it flows back to the bottom of the sliding rotor 6, completing the entire lubricating oil circulation process.

Claims

1. A hydrodynamic internal circulation structure comprising an oil tank (1), a cooler (2), a bearing seat (3), a hydrodynamic bearing pad (4) and a sliding runner (6) rotating with a main shaft (5), the hydrodynamic bearing pad (4) being arranged on the bearing seat (3), the bearing seat (3) being arranged on the oil tank (1), characterized in that: Also include the viscous pump plate (7) and guide tile support ring (8), the viscous pump plate (7) is fixed in the bottom of guide tile support ring (8), the viscous pump plate (7) corresponds with the lower plane of slide rotor (6), the guide tile support ring (8) is provided with oil collecting cavity (9), the opening of oil collecting cavity (9) faces the side of slide rotor (6), the outside of oil collecting cavity (9) is equipped with multiple radial oil guide holes (10), radial oil guide hole (10) is communicated with oil collecting cavity (9), two adjacent guide bearing tile (4) is provided with oil injection pipe (11), the upper part of radial oil guide hole (10) is communicated with oil injection pipe (11), the bearing seat (3) is opened and is discharged oil port (12);Slide rotor (6) rotates with main shaft (5), the relative motion between the lower plane of slide rotor (6) and viscous pump plate (7) forms clearance viscous pump, lubricating oil is pressurized by viscous pump, lubricating oil reaches oil collecting cavity (9), then passes through radial oil guide hole (10) into oil injection pipe (11), oil injection pipe (11) is injected to the surface of slide rotor (6) and lubricates guide bearing tile (4), after lubricating oil finally passes through the back end of bearing seat (3) oil discharge port (12) enters cooler (2), after cooling by cooler (2), backflow to the lower of slide rotor (6).

2. A journal bearing internal circulation arrangement according to claim 1, characterised in that: The upper part of cooler (2) and guide tile support ring (8) are provided with oil retaining ring (13).

3. A journal bearing internal circulation arrangement according to claim 1, wherein: The upper part of oil collecting cavity (9) is provided with labyrinth seal (14).

4. A journal bearing internal circulation arrangement as claimed in claim 1, wherein: The number of radial oil guide hole (10) is same with the number of guide bearing tile (4).

5. A journal bearing internal circulation arrangement as claimed in claim 1, wherein: The oil discharge port (12) is located above the cooler (2).

6. A journal bearing internal circulation arrangement as claimed in claim 1, wherein: The bottom of oil tank (1) is detachably connected with oil tank bottom plate (15).

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