A thrust bearing support structure for pumped storage units

Abstract

The application provides a thrust bearing support structure for pumped storage unit, comprising a thrust bearing support, a thrust pad arranged above the thrust bearing support, a thrust bearing seat arranged below the thrust bearing support, and a thrust bearing support limiting seat arranged around the side of the thrust bearing support. The position of the thrust pad remains unchanged when the unit rotates forward or reversely under the action of the circumferential radial limiting pin. The thrust bearing support changes the circumferential position to realize eccentric support during the shutdown of the unit when the rotating direction needs to be converted by rotating the thrust bearing seat to drive the thrust bearing support. The eccentric support of the thrust bearing of the unit similar to the one-way rotating unit is realized, so that the reliability of the thrust bearing of the pumped storage unit is improved.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery and energy engineering equipment technology, specifically to an eccentric thrust bearing support structure for a pumped storage unit. Background Technology

[0002] With the continuous increase in the capacity of my country's power grid system and the vigorous construction of thermal and nuclear power plants, hydropower stations and pumped storage power stations, which can conveniently regulate the power load of the grid, have also been vigorously constructed in recent decades. In particular, the further accelerated construction of pumped storage power stations will lead to an explosive growth in their number. As is well known, conventional hydropower stations are mainly composed of power generation units consisting of unidirectional hydroelectric turbine generator sets, while pumped storage power stations are composed of unit units consisting of water pumps, water turbines, and generator motors. Conventional hydro-turbine generator units are unidirectional rotating units. The thrust bearings of these units can be designed with optimal circumferential eccentric support as needed. Eccentric thrust bearings have advantages such as high load capacity, large oil film thickness, low bearing temperature, high operational reliability, and easy oil film establishment during low-speed operation. Currently, this circumferential eccentric thrust bearing technology is very mature and widely used in giant, large, medium, and small-to-medium-sized hydro-turbine generator units. Pumped storage units, on the other hand, are bidirectional rotating units. To accommodate the bidirectional rotation of the unit, the thrust bearings are typically supported centrally in the circumferential direction. This circumferential central support method results in disadvantages such as low load capacity, small oil film thickness, high bearing temperature, and poor operational reliability. Furthermore, the oil film is difficult to establish during start-up and shutdown, requiring the assistance of a high-pressure oil jacking device to help establish the oil film and prevent bearing burnout. Although pumped storage unit technology has made significant progress, technical problems with the thrust bearings of pumped storage units still occur from time to time.

[0003] For example, Chinese patent document CN114483767A discloses a heavy-duty water-lubricated thrust bearing, comprising: a stationary support ring and a rotating thrust disk; the stationary support ring is connected to a fixed base, and includes several bearing pads, several bearing pad seats, a bearing pad seat mounting ring, an elastic pad, and a bearing mounting ring. The bearing pads are fixed in the grooves of the bearing pad seats, and the two form a composite; the bearing pad seats are circumferentially distributed on the bearing pad seat mounting ring, and the annular surface formed by the upper surfaces of several bearing pads is the working surface of the stationary support ring. An elastic pad and a bearing mounting ring are sequentially installed at the bottom of the bearing pad seat mounting ring, and the bearing mounting ring is connected to the fixed base, constituting the non-rotating part of the bearing; the rotating thrust disk is the rotating part of the bearing and is connected to rotating machinery; the rotating thrust disk and the stationary support ring are concentric and directly opposite each other, and the working surface of the rotating thrust disk contacts the surface of the bearing pads to form the bearing bearing friction surface. This patented bearing is a fixed thrust bearing, which has a different operating mechanism from the tilting thrust bearing commonly used in conventional hydro-turbine generator units and pumped storage power station units. This patented thrust bearing is a non-tilting thrust bearing structure and does not have circumferential eccentricity, resulting in a low bearing load capacity. Summary of the Invention

[0004] This invention provides a thrust bearing support structure for pumped-storage units, solving problems in the aforementioned background technology such as low load-bearing capacity, lack of circumferential eccentricity in the thrust bearing pad, inability to tilt the thrust bearing pad, small thickness of the friction lubrication medium, high pad temperature, and poor operational reliability. To address these technical problems, the technical solution adopted in this invention is a thrust bearing support structure for pumped-storage units comprising a thrust bearing support, a thrust bearing pad positioned above the thrust bearing support, a thrust bearing seat positioned below the thrust bearing support, and a thrust bearing support limiting seat surrounding the side of the thrust bearing support.

[0005] The thrust bearing pad is fixed to the center body of the frame where the thrust bearing is mounted by a limit pin. During forward and reverse rotation of the unit, the position of the thrust bearing pad relative to the center body of the frame remains essentially unchanged (it only changes within the gap between the upper limit pin hole and the limit pin on the thrust bearing pad). Before the unit needs to switch to forward rotation, when the unit stops, the thrust bearing housing rotates forward to a set position under the push of the hydraulic cylinder. The rotation of the thrust bearing housing, under the action of the thrust bearing support limit seat, causes a circumferential change in the thrust bearing support, creating a positive eccentricity between the thrust bearing support and the thrust bearing pad, achieving the eccentricity required for the forward rotation of the thrust bearing. Before the unit needs to switch to reverse rotation, when the unit stops, the thrust bearing housing rotates in the opposite direction to a set position under the reverse pull of the hydraulic cylinder. The rotation of the thrust bearing housing, under the action of the thrust bearing support limit seat, causes a circumferential change in the thrust bearing support, creating a reverse eccentricity between the thrust bearing support and the thrust bearing pad, achieving the eccentricity required for the reverse rotation of the thrust bearing.

[0006] Preferably, the thrust bearing support includes an upper elastic disc that contacts the bottom surface of the thrust bearing pad and a lower elastic disc that contacts the top surface of the thrust bearing housing. The upper and lower elastic discs are a pair. The contact between the upper and lower elastic discs is spherical. The pair of elastic discs are placed directly inside the thrust bearing support limiting seat. There is a clearance between the outer diameter of the elastic disc and the inner diameter of the thrust bearing limiting seat, facilitating necessary tilting and deflection of the upper elastic disc and the thrust bearing pad. The elastic disc changes position with the circumferential position of the thrust bearing housing. The large contact area between the pair of elastic discs and the bottom surface of the thrust bearing pad and the top surface of the thrust bearing housing provides sufficient support capacity, and the elastic material is durable and resistant to damage.

[0007] Preferably, the bottom surface of the thrust pad that contacts the upper elastic disc has a boss, and the inner diameter side of the thrust pad has an inner diameter radial limiting notch, which is connected by a limiting pin and an inner diameter limiting pin seat; the outer diameter side of the thrust pad has an outer diameter limiting notch, which is connected by a limiting pin and an outer diameter limiting pin seat; the inner diameter limiting pin seat and the outer diameter limiting pin seat correspond one-to-one. The thrust pad is placed on the upper elastic disc, and the boss part is in direct contact with the surface of the upper elastic disc. The boss and the limiting notches on both sides ensure that the thrust pad itself has high strength. The shape of the limiting notch makes the installation of the limiting pin and the installation and replacement of the thrust pad more convenient and easy for the operator to operate. The bottom of the inner diameter side of the thrust pad has an inner diameter radial limiting notch, and the bottom of the outer diameter side of the thrust pad has an outer diameter limiting notch. When installing the thrust bearing, first align the inner diameter side circumferential radial limiting notch with the limiting pin fixed on the inner diameter limiting pin seat. The limiting pin is located on the inner diameter side. After the thrust bearing is in place, install the limiting pin with the axial limiting end on the outer diameter side into the limiting notch on the outer diameter side of the thrust bearing. Both the inner diameter side limiting pin and the outer diameter side limiting pin are installed and fixed on the limiting pin seat. The inner diameter side limiting pin is installed and fixed on the inner diameter limiting pin seat, and the outer diameter side limiting pin is installed and fixed on the outer diameter limiting pin seat. The function of the limiting pin and the limiting pin seat is to prevent the circumferential position of the thrust bearing from changing with the working conditions.

[0008] Preferably, the inner diameter limiting pin seat is mounted on the central body of the frame via an inner diameter side limiting pin seat fixing support; the outer diameter limiting pin seat is mounted on the central body of the frame via an outer diameter side limiting pin seat fixing support; the inner diameter side limiting pin seat fixing supports are distributed circumferentially along the inner diameter of the central body of the frame; the outer diameter side limiting pin seat fixing supports are distributed circumferentially along the outer diameter of the central body of the frame; the inner diameter side limiting pin seat fixing supports and the outer diameter side limiting pin seat fixing supports correspond one-to-one, and the limiting pin and the limiting pin seat are respectively fixed in the limiting pin seat fixing supports on the central body of the frame. The limiting pin seat fixing supports include inner diameter side limiting pin seat fixing supports distributed circumferentially along the inner diameter of the central body of the frame and outer diameter side limiting pin seat fixing supports distributed circumferentially along the outer diameter of the central body of the frame, and the inner diameter side limiting pin seat fixing supports and the outer diameter side limiting pin seat fixing supports correspond one-to-one. The position of the thrust bearing is limited by the inner and outer diameter side limit pin seats on the central body of the frame, thereby limiting the position of the thrust bearing and ensuring that the circumferential position of the thrust bearing does not change with the change of working conditions.

[0009] Preferably, a thrust mirror plate is provided above the thrust bearing. The thrust mirror plate is fixed to the lower surface of the thrust head through a thrust mirror plate stop. A mirror plate fixing bolt is provided at the connection between the thrust mirror plate and the end of the thrust head. The thrust mirror plate rotates together with the thrust head, rotor, and generator shaft. The mirror plate fixing bolt is used to reinforce the connection between the thrust mirror plate and the thrust head.

[0010] Preferably, the thrust bearing housing is a single, ring-shaped component. The thrust bearing housing is positioned within a limiting groove on the bottom via a radial limiting stop. This limiting groove is located on the central body of the frame, between corresponding inner-diameter and outer-diameter limiting pin supports. The thrust bearing housing, as a whole, is essentially nested within the central body of the frame and installed using pre-installed supports on the frame. This installation method using the limiting groove simplifies installation, saves manpower and adjustment time, and ensures a stable and well-fitting overall structure by corresponding to the central body of the frame. The integral ring structure of the thrust bearing housing allows for precise and synchronous changes in the support positions of all thrust bearings by altering their circumferential position, ensuring consistent eccentricity of all thrust bearing bearing supports.

[0011] Preferably, the thrust bearing support and limiting seat is fixed to the thrust bearing housing via a limiting groove. Several fixing screw holes are provided circumferentially on the side of the limiting groove. The thrust bearing support and limiting seat is fixed to the thrust bearing housing via the limiting groove. Several fixing screw holes for the thrust bearing support and limiting seat are provided circumferentially on the upper surface of the thrust bearing housing. A thrust bearing pad is installed on each thrust bearing support and limiting seat. The bottom surface of the thrust bearing pad does not contact the top surface of the thrust bearing support and limiting seat; the bottom surface of the thrust bearing pad only contacts the upper elastic disc support surface. This facilitates simultaneous movement of the thrust bearing support and the thrust bearing support and limiting seat along with the thrust bearing housing under the action of the thrust bearing housing when the operating conditions change (rotation direction changes). The fixing screw holes are used to assist in fixing the thrust bearing support and limiting seat. After the thrust bearing support and limiting seat is fixed in the limiting groove, it is then bolted to the thrust bearing housing through these screw holes.

[0012] Preferably, the piston rod end of the hydraulic cylinder is hinged to the thrust bearing housing, and the bottom of the hydraulic cylinder body is hinged to the hydraulic cylinder fixed hinge support. The hydraulic cylinder fixed hinge supports are evenly distributed on the central body of the frame. The piston rod end of the hydraulic cylinder is hinged and fixed to the thrust bearing housing by pin bolts, and the bottom of the hydraulic cylinder body is hinged and fixed to the fixed support of the central body of the frame by pin bolts. The thrust bearing housing is positioned in two different circumferential positions under the pushing and pulling of the hydraulic cylinders according to the unit's operating conditions. Before the unit rotates forward, the thrust bearing housing is first pushed to rotate forward by the circumferentially distributed hydraulic cylinders. The rotation of the thrust bearing housing, under the action of the thrust bearing support limit seat, causes the circumferential position of the thrust bearing support to change, so that the thrust bearing support generates a positive eccentricity relative to the thrust bearing to achieve the eccentricity required when the thrust bearing rotates forward.

[0013] Before the unit rotates in reverse, the thrust bearing housing is first rotated in the opposite direction by circumferentially distributed hydraulic cylinders. The rotation of the thrust bearing housing, under the action of the thrust bearing support limit seat, causes a change in the circumferential position of the thrust bearing support, creating a reverse eccentricity between the thrust bearing support and the thrust bearing pad, achieving the eccentricity required for the thrust bearing to rotate in reverse. The maximum stroke of the hydraulic cylinder is designed based on the position of the thrust bearing support when the unit rotates forward, and the minimum stroke (zero stroke) of the hydraulic cylinder is designed based on the position of the thrust bearing support when the unit rotates in reverse. The maximum stroke of the hydraulic cylinder is the maximum stroke when the cylinder is filled with oil in the forward direction (bottom), pushing the piston outward. The minimum stroke (zero stroke) of the cylinder is the minimum stroke when the cylinder is filled with oil in the reverse direction (top), retracting the piston to contact the bottom of the cylinder.

[0014] The beneficial effects of this invention are that the thrust bearing support structure is stable and can support large forces. Under the action of the circumferential radial limiting pin, the position of the thrust bearing remains unchanged regardless of whether the unit rotates in the forward or reverse direction. During shutdowns where the unit's rotation direction needs to be changed, the thrust bearing support is first rotated by rotating the thrust bearing seat to change its circumferential position, thus achieving eccentric support. This achieves circumferential eccentric support similar to that of a unidirectional rotating unit's thrust bearing, thereby improving the reliability of the pumped-storage unit's thrust bearing. Simultaneously, the structures of this invention have good structural strength, stable operation, simple and reasonable installation, save manpower, and effectively improve production efficiency. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the thrust bearing support assembly of the present invention.

[0016] Figure 2 This is a top view schematic diagram of the generator operating condition with the thrust bearing support assembly of the present invention.

[0017] Figure 3 This is a top view schematic diagram of the electric motor operating condition of the thrust bearing support assembly of the present invention.

[0018] Figure 4 This is a top view of the thrust bearing housing of the present invention.

[0019] Figure 5 This is a partially enlarged schematic diagram of the limiting groove of the present invention.

[0020] Figure 6 This is a cross-sectional schematic diagram of the thrust bearing housing of the present invention.

[0021] Figure 7 This is a partially enlarged schematic diagram of the thrust mirror plate and thrust head of the present invention.

[0022] Figure 8 This is a schematic diagram of the overall connection between the thrust mirror plate and the thrust head of the present invention.

[0023] Figure 9 This is a top view of the central body of the frame of the present invention.

[0024] Figure 10 This is a schematic diagram of the thrust bearing structure of the present invention.

[0025] Figure 11 This is a top view schematic diagram of the thrust bearing of the present invention.

[0026] Figure 12 This is a schematic diagram of the thrust bearing support structure of the present invention.

[0027] In the diagram: 1. Thrust bearing support; 1-1. Upper elastic disc; 1-2. Lower elastic disc; 2. Thrust bearing pad; 2-1. Boss; 2-2. Inner diameter side radial limiting notch; 2-3. Outer diameter side limiting notch; 3. Thrust bearing seat; 4. Thrust bearing support limiting seat; 5. Limiting pin; 6. Limiting pin seat; 6-1. Inner diameter limiting pin seat; 6-2. Outer diameter limiting pin seat; 7. Frame center body; 8. Thrust mirror plate; 9. Thrust head; 10. 11. Thrust mirror plate stop, 12. Mirror plate fixing bolt, 13. Radial limit stop, 14. Limit groove, 15. Fixing screw hole, 16. Hydraulic cylinder, 17. Piston rod, 18. Hydraulic cylinder fixing hinge support, 19. Limit pin seat fixing support, 10. Inner diameter side limit pin seat fixing support, 11. Outer diameter side limit pin seat fixing support, 12. Thrust bearing seat limit groove, L1. Positive eccentricity, L2. Reverse eccentricity. Detailed Implementation

[0028] The specific implementation of the technical solution of the present invention will be further described below through examples and in conjunction with the accompanying drawings.

[0029] Example 1

[0030] exist Figures 1 to 12In Embodiment 1 shown, a thrust bearing support structure for a pumped storage unit includes a thrust bearing support 1. In this embodiment, the thrust bearing support 1 is an elastic disc. A thrust bearing pad 2 is provided above the thrust bearing support 1, and a thrust bearing seat 3 is provided below the thrust bearing support 1. A thrust bearing support limiting seat 4 surrounds the side of the thrust bearing support 1. The thrust bearing support 1 includes an upper elastic disc 1-1 that contacts the bottom surface of the thrust bearing pad 2 and a lower elastic disc 1-2 that contacts the top surface of the thrust bearing seat 3. The upper elastic disc 1-1 and the lower elastic disc 1-2 are elastic discs used in pairs. There is a fitting clearance between the outer diameter of the thrust bearing support 1 and the inner diameter of the thrust bearing limiting seat 4 to facilitate the flexible deflection of the upper elastic disc 1-1. The thrust bearing support limiting seat 4 is fixed to the thrust bearing seat 3 by a limiting groove 13. Several fixing screw holes 14 are provided in the circumferential direction on the upper surface of the thrust bearing seat 3. The piston rod 15-1 of the hydraulic cylinder 15 is hinged to the thrust bearing housing 3. The bottom of the hydraulic cylinder 15 is hinged to the hydraulic cylinder fixed hinge support 16, which is evenly distributed on the central body 7 of the frame. The bottom surface of the thrust bearing 2 and the upper elastic disc 1-1 is provided with a boss 2-1. The inner diameter side of the thrust bearing 2 is provided with an inner diameter side radial limiting notch 2-2, and the outer diameter side of the thrust bearing 2 is provided with an outer diameter side limiting notch 2-3. The inner diameter side radial limiting notch 2-2 and the outer diameter side limiting notch 2-3 are pinned together by a limiting pin 5 and a limiting pin seat 6. The limiting pin seat 6 is set on the central body 7 of the frame by a limiting pin seat fixing support 17. The inner diameter side radial limiting notch 2-2 is pinned to the inner diameter limiting pin seat 6-1 via the limiting pin 5; the outer diameter side limiting notch 2-3 is pinned to the outer diameter limiting pin seat 6-2 via the limiting pin 5; the inner diameter limiting pin seat 6-1 is mounted on the central body 7 of the frame via the inner diameter side limiting pin seat fixing support 17-1; the outer diameter limiting pin seat 6-2 is mounted on the central body 7 of the frame via the outer diameter side limiting pin seat fixing support 17-2; the inner diameter side limiting pin seat fixing support 17-1 is distributed circumferentially along the inner diameter of the central body 7 of the frame; the outer diameter side limiting pin seat fixing support 17-2 is distributed circumferentially along the outer diameter of the central body 7 of the frame; the inner diameter side limiting pin seat fixing support 17-1 and the outer diameter side limiting pin seat fixing support 17-2 correspond one-to-one. The thrust bearing housing 3 is an integral ring component. The thrust bearing housing 3 is positioned within the thrust bearing housing limiting groove 18 via a radial limiting stop 12. The thrust bearing housing limiting groove 18 is located on the frame center body 7, between corresponding inner diameter side limiting pin fixing supports 17-1 and outer diameter side limiting pin fixing supports 17-2. The limiting pin fixing supports 17-1 include inner diameter side limiting pin fixing supports 17-1 distributed circumferentially along the inner diameter of the frame center body 7 and outer diameter side limiting pin fixing supports 17-2 distributed circumferentially along the outer diameter of the frame center body 7. The inner diameter side limiting pin fixing supports 17-1 and outer diameter side limiting pin fixing supports 17-2 correspond one-to-one.A thrust mirror plate 8 is provided above the thrust bearing 2. The thrust mirror plate 8 is fixed to the lower surface of the thrust head 9 through the thrust mirror plate stop 10. A mirror plate fixing bolt 11 is provided at the connection between the thrust mirror plate 8 and the end of the thrust head 9. One end of the hydraulic cylinder 15 is hinged to the hydraulic cylinder fixing hinge support 16 of the frame center body 7, and the other end, the piston rod 15-1, is hinged to the thrust bearing seat 3. The thrust bearing housing 3 is an integral ring structure, directly placed on the central body 7 of the frame through a radial limiting stop 12. The thrust bearing support limiting seat 4 is bolted to the thrust bearing housing 3 through the limiting groove 13. The upper and lower pairs of elastic discs are placed directly inside the thrust bearing support limiting seat 4. The position of the elastic discs changes with the circumferential direction of the thrust bearing housing 3 according to the unit's operating conditions. The thrust bearing pad 2 is placed on the upper elastic disc 1-1 and is in direct contact with the surface of the upper elastic disc 1-1. The thrust bearing pad 2 is limited by the inner diameter side limiting pin 5-1, the outer diameter side limiting pin 5-2, and the limiting pin seat 6, which are respectively fixed to the limiting pin seat fixing support of the central body 7 of the frame. On seat 17, the position of thrust bearing 2 does not change circumferentially with the change of operating conditions; above thrust bearing 2 is thrust mirror plate 8, which is fixed to the lower surface of thrust head 9 by thrust mirror plate stop 10 and bolts 11. Thrust mirror plate 8, thrust head 9, rotor and generator shaft rotate together; the end of piston rod 15-1 of hydraulic cylinder 15 is hinged to thrust bearing seat 3 by pin bolts, and the bottom of hydraulic cylinder 15 is hinged to hydraulic cylinder fixed hinge support 16 on frame center body 7 by pin bolts. Thrust bearing seat 3 is positioned in two different circumferential positions under the push of hydraulic cylinder 15 according to the change of unit operating conditions.

[0031] One position is the maximum stroke of hydraulic cylinder 15, which is the maximum stroke when the cylinder is filled with oil in the forward direction (bottom), pushing the piston rod 15-1 outward. The other position is the minimum stroke (zero stroke) of hydraulic cylinder 15, which is the minimum stroke when the cylinder is filled with oil in the reverse direction (top), retracting the piston rod 15-1 to contact the bottom of hydraulic cylinder 15. Each thrust bearing support limit seat 4 is equipped with a thrust bearing pad 2. The bottom surface of the thrust bearing pad 2 does not contact the top surface of the thrust bearing support limit seat 4. The bottom surface of the thrust bearing pad 2 only contacts the support surface of the upper elastic disc 1-1. This is to facilitate the simultaneous change of thrust bearing support 1 and thrust bearing support limit seat 4 along with the thrust bearing seat 3 under the action of the thrust bearing seat 3 when the operating conditions change (the rotation direction of the unit changes).

[0032] Example 2

[0033] In this embodiment, the thrust bearing 2 can also be referred to as the thrust bearing. When a unit that needs to change its rotation direction stops, the generator rotor can be appropriately lifted by a brake with a high-pressure oil lifting function (this operating mode can be achieved by simply configuring the high-pressure oil lifting device of the brake for each unit and making simple modifications to the control process of the traditional brake lifting device), so as to completely remove the gravity of the rotating parts of the unit acting on the thrust bearing, thereby reducing the frictional resistance that pushes the thrust bearing housing 3 to rotate circumferentially; of course, high-pressure oil can also be injected at the joint between the bottom of the thrust bearing housing 3 and the central body 7 of the frame to reduce the frictional resistance that pushes the thrust bearing housing 3 to rotate circumferentially, so as to push the thrust bearing housing 3 to rotate circumferentially without unloading the load of the thrust bearing.

[0034] Under the action of the inner diameter side limiting pin 5-1, the outer diameter side limiting pin 5-2, and the corresponding limiting pin seat 6, the position of the thrust bearing 2 remains unchanged regardless of whether the unit rotates forward or backward. The thrust bearing support 1, during shutdowns where the unit's rotation direction needs to be changed, first changes its circumferential position by rotating the thrust bearing seat 3 to achieve eccentric support. The limiting pin seat 6 is fixed to the frame center body 7 by the inner diameter side limiting pin seat fixing support 17-1 and the outer diameter side limiting pin seat fixing support 17-2. The inner diameter side limiting pin seat fixing support 17-1 and the outer diameter side limiting pin seat fixing support 17-2 are circumferentially distributed on the frame center body 7, forming a one-to-one correspondence. In this embodiment, there are 12 outer diameter side limiting pin seat fixing supports 17-2 and inner diameter side limiting pin seat fixing supports 17-1 circumferentially distributed on the frame center body 7.

[0035] Before the unit is prepared to rotate in the forward direction, i.e., the motor is prepared to operate under generator conditions, and this forward rotation is clockwise, the thrust bearing seat 3 is first rotated in the forward direction by the circumferentially evenly distributed hydraulic cylinders 15 when the unit is stopped. In this embodiment, there are 3 hydraulic cylinders, and correspondingly 3 hydraulic cylinder fixed hinge supports 16 are evenly distributed circumferentially on the central body 7 of the frame. The hydraulic cylinder fixed hinge supports 16 are distributed on the side of the outer diameter side limit pin seat fixed support 17-2 away from the center of the central body 7 of the frame.

[0036] The rotation of the thrust bearing housing 3, under the action of the thrust bearing support limit seat, causes the circumferential position of the thrust bearing support 1 to change, so that the thrust bearing support 1 generates a positive eccentricity relative to the thrust bearing 2, achieving the eccentricity required when the thrust bearing rotates in the forward direction; before the unit is ready to rotate in the reverse direction, that is, before the motor is ready to operate in motor mode, when the unit is stopped, the thrust bearing housing 3 is first pulled to rotate in the reverse direction by the three circumferentially distributed hydraulic cylinders 15. The rotation of the thrust bearing housing 3, under the action of the thrust bearing support limit seat 4, causes the circumferential position of the thrust bearing support 1 to change, so that the thrust bearing support 1 generates a reverse eccentricity relative to the thrust bearing 2, achieving the eccentricity required when the thrust bearing rotates in the reverse direction.

[0037] The thrust bearing housing 3 adopts an integral circular ring structure. By changing the circumferential position of the thrust bearing housing 3, the precise and synchronous change of the position of all thrust bearing supports 1 can be easily achieved, ensuring the consistency of the eccentricity of all thrust bearing pads 2 and thrust bearing supports 1. This eccentricity is... Figure 2 This is represented by L1, where L1 is the positive eccentricity.

[0038] Similarly, Figure 3 The diagram shows the motor operating condition, where the unit rotates counterclockwise. The eccentricity at this time is L2 in the diagram, which is the reverse eccentricity. The maximum stroke of hydraulic cylinder 15 is manually designed based on the position of thrust bearing support 1 when the unit rotates clockwise. The maximum stroke of hydraulic cylinder 15 is the maximum stroke when the cylinder is filled with oil in the forward direction (bottom), pushing the hydraulic cylinder piston rod 15-1 outward. The minimum stroke (zero stroke) of hydraulic cylinder 15 refers to the minimum stroke when the cylinder is filled with oil in the reverse direction (top), retracting the hydraulic cylinder piston rod 15-1 to contact the bottom of hydraulic cylinder 15. The limit pin 5 does not change its circumferential position with the change of operating condition, while the thrust bearing support 1, thrust bearing support limit seat 4, and thrust bearing seat 3 change their circumferential positions with the change of operating condition. The generator operating condition refers to the condition in which the unit drives the motor to generate electricity under the action of water. The unit generally rotates clockwise: the center of the thrust bearing support 1 is located to the right of the center of the thrust bearing 2, which is called positive eccentricity. The motor operating condition refers to the condition in which the motor pumps water in the form of a motor under the action of external power. The unit generally rotates counterclockwise: the center of the thrust bearing support 1 is located to the left of the center of the thrust bearing 2, which is called reverse eccentricity.

[0039] In addition to the embodiments described above, within the scope disclosed in the claims and specification of this invention, the technical features or technical data of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A thrust bearing support structure for a pumped-storage unit, characterized in that, Including thrust bearing support (1). A thrust bearing pad (2) is provided above the thrust bearing support (1), a thrust bearing seat (3) is provided below the thrust bearing support (1), and a thrust bearing support limiting seat (4) is provided on the side of the thrust bearing support (1). The bottom surface of the thrust bearing that contacts the upper elastic disc has a boss. The inner diameter side of the thrust bearing has an inner diameter radial limiting notch, which is connected to the inner diameter limiting pin seat by a limiting pin. The outer diameter side of the thrust bearing has an outer diameter limiting notch, which is connected to the outer diameter limiting pin seat by a limiting pin. The inner diameter limiting pin seat is fixed on the central body of the frame by an inner diameter limiting pin seat fixing support. The outer diameter limiting pin seat is fixed on the central body of the frame by an outer diameter limiting pin seat fixing support. The thrust bearing housing is an integral ring, and the thrust bearing housing is set in the limiting groove of the thrust bearing housing by a radial limiting stop.

2. The thrust bearing support structure for a pumped-storage unit according to claim 1, characterized in that, The thrust bearing support (1) includes an upper elastic disc (1-1) that contacts the bottom surface of the thrust bearing (2) and a lower elastic disc (1-2) that contacts the top surface of the thrust bearing seat (3). The upper elastic disc (1-1) and the lower elastic disc (1-2) are a pair of elastic discs.

3. The thrust bearing support structure for a pumped-storage unit according to claim 2, characterized in that, The inner diameter side limiting pin seat (6-1) and the outer diameter side limiting pin seat (6-2) correspond one-to-one.

4. A thrust bearing support structure for a pumped-storage unit according to claim 3, characterized in that, The inner diameter side limiting pin seat fixing support (17-1) is distributed circumferentially along the inner diameter of the frame center body (7); The outer diameter side limiting pin seat fixing support (17-2) is distributed circumferentially along the outer diameter of the frame center body (7); The inner diameter side limiting pin seat fixing support (17-1) and the outer diameter side limiting pin seat fixing support (17-2) correspond one-to-one.

5. A thrust bearing support structure for a pumped-storage unit according to claim 1 or 3, characterized in that, A thrust mirror plate (8) is provided above the thrust bearing (2). The thrust mirror plate (8) is fixed to the lower surface of the thrust head (9) through the thrust mirror plate stop (10). A mirror plate fixing bolt (11) is provided at the connection between the thrust mirror plate (8) and the end of the thrust head (9).

6. A thrust bearing support structure for a pumped-storage unit according to claim 1 or 4, characterized in that, The thrust bearing seat limiting groove (18) is located on the frame center body (7), between the inner diameter side limiting pin seat fixing support (17-1) and the outer diameter side limiting pin seat fixing support (17-2).

7. A thrust bearing support structure for a pumped-storage unit according to claim 1, characterized in that, The thrust bearing support limiting seat (4) is fixed on the thrust bearing seat (3) through the limiting groove (13), and the limiting groove (13) has several fixing screw holes (14) in the circumferential direction on its side.

8. A thrust bearing support structure for a pumped-storage unit according to claim 1 or 3, characterized in that, The thrust bearing seat (3) is hinged to the end of the piston rod (15-1) of the hydraulic cylinder (15). The bottom of the hydraulic cylinder (15) is hinged to the hydraulic cylinder fixed hinge support (16). The hydraulic cylinder fixed hinge support (16) is evenly distributed on the frame center body (7).

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