Novel thrust pad fixing structure of hydraulic generator

Abstract

The utility model discloses a novel thrust pad fixing structure of a hydro-generator, which belongs to the technical field of bearings of power generation equipment and consists of a rack, a thrust pad supporting ring, a thrust pad spacer block, a supporting pad support, a supporting pad and a thrust pad. The thrust pad supporting ring and the rack are arranged into a whole; an inner ring of the thrust pad supporting ring is arranged to be of a spigot structure, thrust pad spacer blocks are arranged above the thrust pad supporting ring, a supporting pad support, a supporting pad and a thrust pad are sequentially arranged between every two adjacent thrust pad spacer blocks, the lower portion of each supporting pad support makes contact with the thrust pad supporting ring, and the inner diameter side of each thrust pad spacer block is tightly attached to the spigot structure. And the adjacent thrust pad spacer blocks and the seam allowance structures form a structure combination for radially limiting the adjacent supporting pads. The thrust bearing fixing structure can effectively avoid the risk that thrust pad spacer block fixing bolts bear radial force and lose efficacy, the radial force bearing capacity of the thrust bearing fixing structure is enhanced, and the thrust bearing safety is improved.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology for power generation equipment, and specifically relates to a novel thrust bearing fixing structure for a hydro generator. Background Technology

[0002] In existing vertical generator thrust bearing structures, several thrust bearing limiting methods have been proposed to address the issue of the thrust bearing continuously shifting inward during start-up, shutdown, and alternating hot and cold cycles. These methods include: first, using a stop joint between the thrust bearing and the support bearing; second, installing a baffle on the inner diameter side; and third, using a T-shaped spacer block fixed to the base plate with bolts. When subjected to significant radial force, the baffle is prone to bending, causing the thrust bearing to move inward. Although the limiting screw can withstand large radial forces, when the thrust bearing is subjected to horizontal torque, it will rotate around the limiting screw, affecting the reliability of the thrust bearing.

[0003] The radial force borne by the "T"-shaped spacer is entirely borne by the fixing bolt, which poses a risk of bolt rotation or fatigue loosening. In the prior art using spacers with a "T"-shaped cross-section, Chinese Patent No. CN202023057948.0, published on August 6, 2021, discloses a generator thrust bearing limiting device. Its features include a bearing, a bearing support, and a spacer. The bearing has a groove, and the thrust bearing has a protrusion that matches the groove. The thrust bearing is embedded in the bearing, the bearing is fixed to the bearing support, the bearing support is fixed to a base component, and the spacer is fixed to the base component by screws. A stop block with a "T"-shaped cross-section is fixedly connected to the spacer to block the groove.

[0004] However, the aforementioned existing technologies have obvious shortcomings:

[0005] 1. The “T”-shaped spacer is completely fixed by bolts. The radial force transmitted from the thrust pad is entirely borne by the fixing bolts, which poses a safety risk of the thrust pad failing to limit due to bolt loosening.

[0006] 2. The contact surface between the "T" block and the thrust bearing is not perpendicular to the circumferential swing center line of the thrust bearing. During the start-up and shutdown of the hydro turbine generator, there is a risk that the swing of the thrust bearing may be restricted, thus affecting the establishment of the lubricating oil film and causing the thrust bearing to wear. Summary of the Invention

[0007] The purpose of this utility model is to overcome the above-mentioned problems in the prior art and provide a new thrust bearing fixing structure for a hydro-generator to solve the problem of thrust bearing wear caused by insufficient lubricating oil film, which affects safety.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A novel thrust bearing fixing structure for a hydro-generator is characterized by comprising a frame, a thrust bearing support ring, a thrust bearing spacer, a bearing support, a bearing, and a thrust bearing; the thrust bearing support ring and the frame are integrally formed; the inner ring of the thrust bearing support ring has a stop structure; a thrust bearing spacer is provided above the thrust bearing support ring; a bearing support, a bearing, and a thrust bearing are sequentially arranged between two adjacent thrust bearing spacers; the inner diameter side of the thrust bearing spacer is attached to the stop structure; the thrust bearing spacer and the stop structure together constitute a structural combination for radially limiting adjacent bearings; the lower part of the bearing support contacts the thrust bearing support ring.

[0010] The stop structure is an annular protrusion provided on the inner ring of the thrust bearing support ring.

[0011] The thrust pad spacer has a T-shaped structure, with adjacent thrust pad spacers located in the T-shaped grooves on both sides of the thrust pad, and the size of the T-shaped grooves is adapted to the thrust pad spacer.

[0012] The adjacent thrust pad spacer and the annular protrusion together radially limit the adjacent thrust pads.

[0013] The stop surface of the T-shaped structure is perpendicular to the centripetal centerline of the two adjacent thrust bearings.

[0014] The contact surface between the inner diameter side of the thrust bearing spacer and the annular protrusion is either a plane or an arc surface.

[0015] The thrust pad and the toe pad work together to form a male and female stop.

[0016] The male and female stop joints include: a groove provided on the inner ring side of the thrust bearing and a protrusion provided on the inner ring side of the support bearing; the groove and the protrusion contact and cooperate to limit the movement and form the male and female stop joints.

[0017] The thrust bearing spacer is fixedly connected to the thrust bearing support ring.

[0018] The thrust bearing spacer is fixed to the thrust bearing support ring by bolts.

[0019] The advantages of using this utility model are:

[0020] 1. The inner ring of the thrust bearing support ring adopts a full-circle stop structure, and the support ring is integrally welded to the frame. Together with the "T"-shaped structure of the thrust bearing spacer, it forms a combined limiting structure, which can effectively prevent the thrust bearing from shifting inward during long-term operation. It can also avoid the risk of the thrust bearing spacer fixing bolts failing due to radial force, enhance the ability of the thrust bearing fixing structure to withstand radial force, and improve the safety of the thrust bearing.

[0021] Second, the stop surfaces on both sides of the "T"-shaped structure of the thrust bearing spacer are perpendicular to the centripetal center line of the adjacent thrust bearings. During the start-up and shutdown of the hydro turbine generator, the thrust bearing swings to establish a lubricating oil film more smoothly, which can avoid thrust bearing wear and improve safety.

[0022] 3. The contact surface between the inner ring side of the thrust bearing spacer and the support ring can be a plane or an arc surface. That is, the contact form between the spacer and the support ring can be a line contact or a surface contact. The stop limit contact form can be flexibly selected according to the radial limit bearing requirements. Attached Figure Description

[0023] Figure 1 This is a top view of the thrust bearing structure of this utility model;

[0024] Figure 2 The thrust bearing structure of this utility model Figure 1 AA section view in the middle;

[0025] Figure 3 The thrust bearing structure of this utility model Figure 1 BB cross-section diagram in the middle;

[0026] Figure 4 This utility model is a thrust bearing. Figure 2 The spacer block and the CC section of the Towa.

[0027] The markings in the diagram are as follows: 1. Thrust bearing support ring, 2. Thrust bearing spacer, 3. Support bearing, 4. Thrust bearing, 5. Frame, 6. Support bearing support, 7. Stop structure, 8. Protrusion, 9. Groove, 10. T-shaped groove, 11. Centripetal center line, 12. Yin and Yang stop, 13. Annular protrusion. Detailed Implementation

[0028] Example 1

[0029] This embodiment, in conjunction with the accompanying drawings, further illustrates the structure and principle of this utility model:

[0030] A novel thrust bearing fixing structure for a hydro-generator comprises a frame 5, a thrust bearing support ring 1, a thrust bearing spacer 2, a bearing support 6, a bearing 3, and a thrust bearing 4. The thrust bearing support ring 1 and the frame 5 are integrated. The inner ring of the thrust bearing support ring 1 is provided with a stop structure 7. A thrust bearing spacer 2 is provided above the thrust bearing support ring 1. A bearing support 6, a bearing 3, and a thrust bearing 4 are sequentially arranged between two adjacent thrust bearing spacers 2. The inner diameter side of the thrust bearing spacer 2 is attached to the stop structure 7. The thrust bearing spacer 2 and the stop structure 7 together form a structural combination that radially limits the adjacent bearings 3. The lower part of the bearing support 6 contacts the thrust bearing support ring 1.

[0031] The stop structure 7 is an annular protrusion 13 provided on the inner ring of the thrust bearing support ring 1.

[0032] The thrust pad spacer 2 has a T-shaped structure, and the adjacent thrust pad spacers 2 are located in the T-shaped grooves 10 on both sides of the support pad 3, and the size of the T-shaped grooves 10 is adapted to the thrust pad spacers 2.

[0033] The adjacent thrust pad spacer 2 and the annular protrusion 13 together radially limit the adjacent thrust pad 3.

[0034] The stop surface of the T-shaped structure is perpendicular to the centripetal center line 11 of the two adjacent thrust bearings 4.

[0035] The contact surface between the inner diameter side of the thrust bearing spacer 2 and the annular protrusion 13 is either a plane or an arc surface.

[0036] The thrust bearing 4 and the toe bearing 3 work together to form the male and female stop 12.

[0037] The male and female stop 12 includes: a groove 9 provided on the inner ring side of the thrust bearing 4 and a protrusion 8 provided on the inner ring side of the support bearing 3; the groove 9 and the protrusion 8 contact and cooperate to limit the movement and form the male and female stop 12.

[0038] The thrust bearing spacer 2 is fixedly connected to the thrust bearing support ring 1.

[0039] The thrust bearing spacer 2 is fixed to the thrust bearing support ring 1 by bolts.

[0040] The following section, in conjunction with the accompanying drawings, provides a detailed explanation of this scheme. Figure 1-4 As shown, the thrust bearing support ring 1 is welded to the frame 5 as a whole. The bearing support 6 and the thrust bearing spacer 2 are both fixed on the thrust bearing support ring 1. The inner ring side of the thrust bearing support ring 1 has a stop structure 7. The inner diameter side of the thrust bearing spacer 2 is close to the annular protrusion 13 of the stop structure 7 of the thrust bearing support ring 1. The stop structure 7 restricts the thrust bearing spacer 2 from moving inward, so that the fixing bolt of the thrust bearing spacer 2 is not subjected to inward shear force. The thrust pad 4 is fixed to the support pad 3 via the male and female stop 12. The inner ring side of the thrust pad 4 has a groove 9 that mates with the protrusion 8 on the inner ring side of the support pad 3. The support pad 3 is fixed to the support pad support 6. The thrust pad spacer 2 is fixed between two adjacent support pads 3. The thrust pad spacer 2 has a "T" shaped structure and connects with the adjacent support pad 3 containing the T-shaped groove 10 structure, connecting all the thrust pads 4 on the circumference with the thrust pad spacer 2 into one unit. The thrust pad spacer 2 and the stop structure 7 together form a structural combination that radially limits the adjacent support pads 3. The stop surfaces on both sides of the "T" shaped structure of the thrust pad spacer 2 are perpendicular to the centripetal center line 11 of the adjacent thrust pads 4.

[0041] This structure fundamentally improves the fixing ability of the thrust bearing, thereby increasing the radial force that the thrust bearing can withstand. During the start-up and shutdown of the hydro-generator, it ensures smoother establishment of a lubricating oil film by the thrust bearing's swing, preventing thrust bearing wear and improving the operational safety of the thrust bearing. The structure is simple, has low manufacturing cost, and is suitable for large-scale application.

Claims

1. A novel thrust bearing fixing structure for a hydro-generator, characterized in that: It consists of a frame (5), a thrust bearing support ring (1), a thrust bearing spacer (2), a bearing support (6), a bearing (3), and a thrust bearing (4). The thrust bearing support ring (1) and the frame (5) are set as a whole. The inner ring of the thrust bearing support ring (1) is provided with a stop structure (7). A thrust bearing spacer (2) is provided above the thrust bearing support ring (1). A bearing support (6), a bearing (3), and a thrust bearing (4) are arranged in sequence between two adjacent thrust bearing spacers (2). The inner diameter side of the thrust bearing spacer (2) is attached to the stop structure (7). The thrust bearing spacer (2) and the stop structure (7) together form a structural combination that radially limits the adjacent bearings (3). The lower part of the bearing support (6) is in contact with the thrust bearing support ring (1).

2. The novel thrust bearing fixing structure for a hydro-generator according to claim 1, characterized in that: The stop structure (7) is an annular protrusion (13) provided on the inner ring of the thrust bearing support ring (1).

3. The novel thrust bearing fixing structure for a hydro-generator according to claim 1, characterized in that: The thrust pad spacer (2) has a T-shaped structure. The adjacent thrust pad spacers (2) are located in the T-shaped grooves (10) on both sides of the support pad (3), and the size of the T-shaped grooves (10) is adapted to the thrust pad spacers (2).

4. A novel thrust bearing fixing structure for a hydro-generator according to claim 1 or 2, characterized in that: The adjacent thrust pad spacer (2) and the annular protrusion (13) together radially limit the adjacent thrust pad (3).

5. The novel thrust bearing fixing structure for a hydro-generator according to claim 3, characterized in that: The stop surface of the T-shaped structure is perpendicular to the centripetal center line (11) of the two adjacent thrust bearings (4).

6. The novel thrust bearing fixing structure for a hydro-generator according to claim 4, characterized in that: The contact surface between the inner diameter side of the thrust pad spacer block (2) and the annular protrusion (13) is either a plane or an arc surface.

7. The novel thrust bearing fixing structure for a hydro-generator according to claim 1, characterized in that: The thrust pad (4) and the toe pad (3) work together to form a male-female stop (12).

8. The novel thrust bearing fixing structure for a hydro-generator according to claim 7, characterized in that: The male and female stop (12) includes: a groove (9) provided on the inner ring side of the thrust bearing (4) and a protrusion (8) provided on the inner ring side of the support bearing (3); the groove (9) and the protrusion (8) contact and cooperate to limit the movement to form the male and female stop (12).

9. A novel thrust bearing fixing structure for a hydro-generator according to claim 1, characterized in that: The thrust bearing spacer (2) is fixedly connected to the thrust bearing support ring (1).

10. A novel thrust bearing fixing structure for a hydro-generator according to claim 9, characterized in that: The thrust bearing spacer (2) is fixed to the thrust bearing support ring (1) by bolts.

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