A horizontal mixed-flow turbine axial thrust device

Abstract

This utility model relates to the field of horizontal mixed-flow turbine technology, and more particularly to an axial thrust device for a horizontal mixed-flow turbine. It includes a rear cover plate main body assembly, a baffle plate assembly, and a rear cover plate filling assembly. The rear cover plate main body assembly includes a rear cover plate body. In this utility model, through the connection between the rear cover plate body, the baffle plate body, and the rear cover plate filling body, the device can lock the rear cover plate filling body, thereby locking the baffle plate body. The baffle plate body reduces the operating temperature of the thrust bearing of the combined bearing carrying thrust in the unit, improving the reliability and safety of the unit's operation. This device has a mechanical structure that facilitates disassembly and assembly, allowing workers to easily replace damaged baffle plate bodies. The rear cover plate body and undamaged baffle plate bodies can be reinstalled on the turbine for continued use. This device can effectively reduce the maintenance cost of the baffle plate body.

Description

Technical Field

[0001] This utility model relates to the field of horizontal mixed-flow turbine technology, specifically to an axial thrust device for a horizontal mixed-flow turbine. Background Technology

[0002] During the operation of a horizontal mixed-flow turbine, water flows radially into the runner from all sides and then flows out of the runner approximately axially. When the unit is running, the turbine runner generates an axial thrust along the main shaft during rotation. This thrust is transmitted to the thrust bearings through the mirror plate on the main shaft. As the turbine guide vane opening increases and the generator load increases, the stress on the thrust bearings gradually increases, leading to a rise in bearing temperature and ultimately causing a bearing failure. The axial thrust device of the horizontal mixed-flow turbine can withstand the axial water thrust, preventing excessive stress on the thrust bearings, preventing excessively high thrust bearing temperatures that could lead to bearing failure, and ensuring the reliability and safety of the unit's operation.

[0003] The utility model patent with authorization announcement number "CN 210 Rear cover plate filling assembly (3)442U" discloses an axial thrust structure for a horizontal mixed-flow turbine. This utility model increases the water pressure at the lower ring of the runner by setting a water-blocking part between the tailrace cone and the bottom of the lower ring of the runner, thereby increasing the reverse thrust of the runner and reducing the operating temperature of the combined bearing (thrust pad) of the unit with thrust, improving the reliability and safety of the unit's operation, reducing the operating and maintenance costs of the power station, and improving the economic benefits of the power station. This utility model adds to the existing conventional horizontal mixed-flow turbine... Adding a water-blocking part can reduce the temperature of the thrust bearing bearing of the unit with an extremely simple structure, which is extremely beneficial for the technical upgrading of existing turbine units and the construction of new turbine units. However, the water-blocking part of this utility model is fixedly installed on the rear cover plate of the turbine and cannot be disassembled. The water-blocking part is small in size and needs to withstand a certain water pressure. Therefore, the water-blocking part is more prone to damage than the rear cover plate. If the water-blocking part is damaged, the entire rear cover plate, i.e. the water-blocking part, needs to be replaced, which has a high maintenance cost. Therefore, in order to solve the above problems, an axial thrust device for a horizontal mixed-flow turbine is proposed. Utility Model Content

[0004] The purpose of this utility model is to provide an axial thrust device for a horizontal mixed-flow turbine, in order to solve the problem that the water-blocking part of some existing horizontal mixed-flow turbine axial thrust devices is fixedly installed on the rear cover plate of the turbine and cannot be disassembled. The water-blocking part is small in size and needs to withstand a certain water pressure. Therefore, the water-blocking part is more prone to damage than the rear cover plate. If the water-blocking part is damaged, the entire rear cover plate, i.e. the water-blocking part, needs to be replaced, which results in high maintenance costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An axial thrust device for a horizontal mixed-flow turbine includes a rear cover plate main body assembly, a baffle plate assembly, and a rear cover plate filling assembly. The rear cover plate main body assembly includes a rear cover plate body. A first limiting groove is provided on the rear side of the rear cover plate body. Multiple second limiting grooves are provided on the front side of the first limiting groove. Limiting shafts are fixedly connected to the rear side of the rear cover plate body. Multiple third limiting grooves are provided on the rear side of the rear cover plate body. Multiple reinforcing baffles are fixedly connected to the rear side of the rear cover plate body. A baffle plate assembly is provided on the rear side of the rear cover plate main body assembly. The baffle plate assembly includes multiple baffle plate bodies. A first limiting hole is provided at the middle position of each baffle plate body. Limiting protrusions are fixedly connected to both ends of each baffle plate body. A rear cover plate filling assembly is provided on the rear side of the baffle plate assembly. The rear cover plate filling assembly includes a rear cover plate filling body. Multiple second limiting holes are provided on the front side of the rear cover plate filling body. Multiple limiting baffles are fixedly connected to the outer side of the rear cover plate filling body.

[0007] Preferably, the second limiting groove, the third limiting groove, and the reinforcing baffle are all circumferentially distributed, with the second limiting groove located inside the reinforcing baffle and the third limiting groove located outside the reinforcing baffle.

[0008] Preferably, the limiting shafts are all located at the middle rear side of the second limiting groove, and the limiting shafts all pass through the first limiting hole and the second limiting hole.

[0009] Preferably, the main body of the water baffle is located within the second limiting groove, and the main body of the water baffle protrudes from the second limiting groove, with each pair of limiting protrusions located within the second limiting groove.

[0010] Preferably, the front sides of the water baffle body and the limiting protrusion are both in contact with the rear cover body, and the rear sides of the water baffle body and the limiting protrusion are both in contact with the rear cover filling body.

[0011] Preferably, the rear cover plate filling body is inserted into the first limiting groove, and the limiting baffles are all inserted into the third limiting groove, with the rear sides of the rear cover plate filling body, the limiting baffles, and the reinforcing baffles aligned.

[0012] Preferably, the limiting baffles are located between two adjacent reinforcing baffles, and both sides of the limiting baffles are in contact with the reinforcing baffles.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] In this invention, the device, consisting of a rear cover plate body, a baffle plate body, and a rear cover plate filling body, can lock the rear cover plate filling body by connecting the rear cover plate body to the end of the turbine casing, thereby locking the baffle plate body. The baffle plate body reduces the operating temperature of the thrust bearing of the combined bearing with thrust in the unit, improving the reliability and safety of the unit's operation. The device has a mechanical structure that is easy to disassemble and assemble, allowing workers to easily replace damaged baffle plate bodies. The rear cover plate body and undamaged baffle plate bodies can be reinstalled on the turbine and used again. This device can effectively reduce the maintenance cost of the baffle plate body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0017] Figure 3 This is an assembly drawing of the overall structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the main component of the rear cover plate of this utility model.

[0019] In the diagram: 1. Rear cover plate main body assembly; 11. Rear cover plate body; 12. First limiting groove; 13. Second limiting groove; 14. Limiting shaft; 15. Third limiting groove; 16. Reinforcing baffle; 2. Water baffle assembly; 21. Water baffle body; 22. First limiting hole; 23. Limiting protrusion; 3. Rear cover plate filling assembly; 31. Rear cover plate filling body; 32. Second limiting hole; 33. Limiting baffle. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution:

[0024] An axial thrust device for a horizontal mixed-flow turbine includes a rear cover plate main assembly 1, a baffle plate assembly 2, and a rear cover plate filling assembly 3. The rear cover plate main assembly 1 includes a rear cover plate body 11. A first limiting groove 12 is provided on the rear side of the rear cover plate body 11, and multiple second limiting grooves 13 are provided on the front side of the first limiting groove 12. Limiting shafts 14 are fixedly connected to the rear side of the rear cover plate body 11. Multiple third limiting grooves 15 are provided on the rear side of the rear cover plate body 11, and multiple reinforcing baffles 16 are fixedly connected to the rear side of the rear cover plate body 11. A baffle assembly 2 is provided on the rear side of the cover plate main body assembly 1. The baffle assembly 2 includes multiple baffle bodies 21. Each baffle body 21 has a first limiting hole 22 in the middle position. Both ends of the baffle body 21 are fixedly connected to limiting protrusions 23. A rear cover plate filling assembly 3 is provided on the rear side of the baffle assembly 2. The rear cover plate filling assembly 3 includes a rear cover plate filling body 31. Multiple second limiting holes 32 are provided on the front side of the rear cover plate filling body 31. Multiple limiting baffles 33 are fixedly connected to the outer side of the rear cover plate filling body 31.

[0025] The second limiting groove 13, the third limiting groove 15, and the reinforcing baffle 16 are all circumferentially distributed. The second limiting groove 13 is located inside the reinforcing baffle 16, and the third limiting groove 15 is located outside the reinforcing baffle 16. The reinforcing baffle 16 can limit the rear cover plate filling body 31. The limiting shafts 14 are all located at the middle of the rear side of the second limiting groove 13. The limiting shafts 14 all pass through the first limiting hole 22 and the second limiting hole 32. The limiting shafts 14 can limit the water baffle body 21 and the rear cover plate filling body 31. The water baffle bodies 21 are all located inside the second limiting groove 13 and protrude from the second limiting groove 13. Each pair of limiting protrusions 23 are located inside the second limiting groove 13. The second limiting groove 13 can limit the limiting protrusions 23. The front sides of the limiting protrusions 23 are in contact with the rear cover plate body 11, and the rear sides of the baffle plate body 21 and the limiting protrusions 23 are in contact with the rear cover plate filling body 31. The rear cover plate body 11 and the rear cover plate filling body 31 can lock the baffle plate body 21 and the limiting protrusions 23. The rear cover plate filling body 31 is inserted into the first limiting groove 12, and the limiting baffles 33 are all inserted into the third limiting groove 15. The rear sides of the rear cover plate filling body 31, the limiting baffles 33, and the reinforcing baffles 16 are aligned. The limiting baffles 33 can be locked by the rear cover plate body 11 and the end of the casing of the horizontal mixed-flow turbine. The limiting baffles 33 are all located between two adjacent reinforcing baffles 16, and both sides of the limiting baffles 33 are in contact with the reinforcing baffles 16. The limiting baffles 33 can be limited by the reinforcing baffles 16.

[0026] Workflow: Before use, check that all components of the device are intact. If intact, the device can be installed at the end of the horizontal mixed-flow turbine. The operator first places the baffles, consisting of multiple baffle bodies 21 and limiting protrusions 23, into the second limiting groove 13, allowing the limiting shaft 14 to pass through the first limiting hole 22. The baffle bodies 21 are positioned using the second limiting groove 13 and the limiting shaft 14. Then, the operator places the rear cover plate filling body 31 into the first limiting groove 12, allowing the limiting shaft 14 to pass through the second limiting hole 32, and inserting the limiting baffle 33 into the third limiting groove 15. 14 and the reinforcing baffle 16 can limit the rear cover plate filling body 31 and the limiting baffle 33. Then, the workers use connecting bolts to connect the rear cover plate body 11 and the end of the casing of the horizontal mixed-flow turbine, so that the rear side of the rear cover plate body 11 and the end of the casing of the horizontal mixed-flow turbine are tightly fitted. At this time, the limiting baffle 33 can be locked by the rear cover plate body 11 and the end of the casing of the horizontal mixed-flow turbine, thereby preventing the rear cover plate filling body 31 and the rear cover plate body 11 from relative displacement. The rear cover plate body 11 and the rear cover plate filling body 31 can then lock the baffle plate body 21 and the limiting protrusion 2. 3. Locking: The limiting protrusion 23 located in the second limiting groove 13 prevents the baffle plate body 21 from falling out. After the device is installed, the water pressure at the lower ring of the turbine runner can be increased through the baffle plate body 21, increasing the reverse thrust of the runner, thereby reducing the operating temperature of the thrust bearing of the combined bearing with thrust, and improving the reliability and safety of the unit operation. If the baffle plate body 21 is damaged during use, the operator can remove the rear cover plate body 11, take out the rear cover plate filling body 31 from the inside of the rear cover plate body 11, replace the damaged baffle plate body 21, and then reinstall the rear cover plate body 11. Installed on the turbine; this device can lock the rear cover plate filling body 31 by connecting the rear cover plate body 11 to the end of the turbine casing, thereby locking the baffle plate body 21. The baffle plate body 21 reduces the operating temperature of the thrust bearing of the unit with thrust, improving the reliability and safety of the unit operation. The device has a mechanical structure that is easy to disassemble and assemble, and the staff can easily replace the damaged baffle plate body 21. The rear cover plate body 11 and the undamaged baffle plate body 21 can be reinstalled on the turbine and used again. This device can effectively reduce the maintenance cost of the baffle plate body 21.

[0027] Contents not described in detail in this specification are existing technologies known to those skilled in the art. Standard parts used in this invention can all be purchased commercially, and irregularly shaped parts can be custom-made according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are already mature technologies. The machinery, parts, and equipment all use conventional models from the prior art, and the circuit connections also employ conventional connection methods from the prior art, which will not be detailed here.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An axial thrust device for a horizontal mixed-flow turbine, comprising a rear cover plate main assembly (1), a baffle plate assembly (2), and a rear cover plate filling assembly (3), characterized in that: The rear cover plate main assembly (1) includes a rear cover plate body (11). A first limiting groove (12) is provided on the rear side of the rear cover plate body (11). Multiple second limiting grooves (13) are provided on the front side of the first limiting groove (12). Limiting shafts (14) are fixedly connected to the rear side of the rear cover plate body (11). Multiple third limiting grooves (15) are provided on the rear side of the rear cover plate body (11). Multiple reinforcing baffles (16) are fixedly connected to the rear side of the rear cover plate body (11). A water baffle assembly (2) is provided on the rear side of the rear cover plate main assembly (1). The water baffle assembly (2) includes multiple baffle bodies (21), each baffle body (21) has a first limiting hole (22) in the middle, and each baffle body (21) has a limiting protrusion (23) fixedly connected to both ends. The rear side of the baffle assembly (2) is provided with a rear cover plate filling assembly (3), which includes a rear cover plate filling body (31). The front side of the rear cover plate filling body (31) has multiple second limiting holes (32), and the outer side of the rear cover plate filling body (31) is fixedly connected with multiple limiting baffles (33).

2. The axial thrust device for a horizontal mixed-flow turbine according to claim 1, characterized in that: The second limiting groove (13), the third limiting groove (15), and the reinforcing baffle (16) are all circumferentially distributed. The second limiting groove (13) is located inside the reinforcing baffle (16), and the third limiting groove (15) is located outside the reinforcing baffle (16).

3. The axial thrust device for a horizontal mixed-flow turbine according to claim 1, characterized in that: The limiting shafts (14) are all located at the middle rear side of the second limiting groove (13), and the limiting shafts (14) all pass through the first limiting hole (22) and the second limiting hole (32).

4. The axial thrust device for a horizontal mixed-flow turbine according to claim 1, characterized in that: The main body (21) of the water baffle is located in the second limiting groove (13), and the main body (21) of the water baffle protrudes from the second limiting groove (13). Each pair of limiting protrusions (23) is located in the second limiting groove (13).

5. The axial thrust device for a horizontal mixed-flow turbine according to claim 1, characterized in that: The front sides of the water baffle body (21) and the limiting protrusion (23) are both in contact with the rear cover body (11), and the rear sides of the water baffle body (21) and the limiting protrusion (23) are both in contact with the rear cover filling body (31).

6. The axial thrust device for a horizontal mixed-flow turbine according to claim 1, characterized in that: The rear cover filling body (31) is inserted into the first limiting groove (12), and the limiting baffles (33) are all inserted into the third limiting groove (15). The rear sides of the rear cover filling body (31), the limiting baffles (33), and the reinforcing baffles (16) are aligned.

7. The axial thrust device for a horizontal mixed-flow turbine according to claim 1, characterized in that: The limiting baffles (33) are all located between two adjacent reinforcing baffles (16), and both sides of the limiting baffles (33) are in contact with the reinforcing baffles (16).

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