Pressure equalizing pipe for top cover of water turbine
By introducing movable anti-blocking devices and folded-diameter shock absorbing pipes into the pressure equalization pipe of the turbine, the problems of self-excitation vibration and pressure pulsation are solved, and the stable operation and efficient energy conversion of the equipment are achieved, which extends the equipment life and reduces safety hazards.
Patent Information
- Application Number
- CN202422426419.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-10-09
AI Technical Summary
During operation, the pressure equalization pipe of the turbine roof is prone to cause self-excitation vibration and pressure pulsation, resulting in water leakage on the sealing surface or even flooding the factory. The existing pressure equalization pipe cannot effectively absorb and disperse vibration energy, affecting the stability and life of the equipment.
A water turbine top cover equalization tube is designed, including the first and second pipe bodies. A movable anti-blocking device is provided in the middle folded tube. Combined with the first and second folded damping tubes, the vibration energy is absorbed through the sliding limit structure and the hindering spring, reducing structural deformation, and the conversion of water energy to mechanical energy is realized through the movable end plate and the extruded push rod.
Effectively absorb and disperse vibration energy, reduce structural deformation, improve equipment stability and life, reduce noise, improve turbine working efficiency, and maintain stable operation under different flow rates to avoid safety hazards.
Smart Images
Figure CN223062574U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field related to hydraulic turbines, and more specifically, particularly relates to a pressure equalizing pipe for a hydraulic turbine top cover. Background Technique
[0002] A hydraulic turbine is a major equipment in a hydropower station, and its operating conditions are directly related to the safety, economy, and stable operation of the power station. Among them, the hydraulic turbine top cover is one of the important components of the hydraulic turbine. Generally, a pressure equalizing pipe is provided on the top cover in a Francis turbine unit. However, during actual use, the pressure pulsation in the pressure chamber between the runner and the top cover and in the draft tube will cause corresponding self-excited vibration through the action of the pressure equalizing pipe, and the rotation of the runner and the pressure equalizing pipe connected to the draft tube will cause pressure disturbance to the water flow in the pressure chamber, thereby forming pressure pulsation of the water flow, resulting in vibration of the unit. Therefore, even after the connection section of the pressure equalizing pipe is installed, during operation, the sealing surface is prone to water leakage and even a safety accident of flooding the power house may occur.
[0003] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and a pressure equalizing pipe for a hydraulic turbine top cover is provided, with the expectation of achieving a more practical value. Content of the Utility Model
[0004] The utility model provides a pressure equalizing pipe for a hydraulic turbine top cover to overcome the above defects in the prior art.
[0005] The purpose and effect of a pressure equalizing pipe for a hydraulic turbine top cover of the utility model are achieved by the following specific technical means:
[0006] A pressure equalizing pipe for a hydraulic turbine top cover includes: a first pipe body and a second pipe body. The first pipe body is arranged above the second pipe body. A middle corrugated pipe is connected in the middle of the first pipe body and the second pipe body. A middle flow cavity is arranged inside the middle corrugated pipe. An active anti-blocking device is installed in the middle flow cavity. The active anti-blocking device includes an upper fixed plate, a movable end plate, and a pressing push rod. The upper fixed plate is fixedly installed on the inner wall of the middle flow cavity. A return spring is fixedly connected to the bottom surface of the upper fixed plate. The end of the return spring is rotatably connected to the movable end plate. A plurality of arc-shaped blades are annularly arranged on the upper side of the movable end plate. A pressing push rod is fixedly connected to the lower side of the movable end plate. A spiral guide vane is arranged outside the pressing push rod. A push plate is connected to the end of the pressing push rod.
[0007] Further technical solution, the first pipe body includes an upper connecting piece and a first corrugated shock-absorbing pipe. The upper end of the first corrugated shock-absorbing pipe is fixedly provided with an upper connecting piece. The lower end of the upper connecting piece is connected with an upper three-way connecting pipe. Both output ends of the upper three-way connecting pipe are fixedly connected with a first corrugated shock-absorbing pipe.
[0008] Further technical solution: The upper end connecting member includes a second flange connecting piece and a first flange connecting piece. The first flange connecting piece is disposed above the second flange connecting piece. A corrugated pipe is connected between the second flange connecting piece and the first flange connecting piece, and a damping spring is disposed outside the corrugated pipe.
[0009] Further technical solution: The first corrugated damping pipe includes an end flange member and an end connecting piece. The end flange member is disposed at the upper end of the end connecting piece. A damping corrugated pipe is connected between the end connecting piece and the end flange member, and a blocking spring is disposed outside the damping corrugated pipe.
[0010] Further technical solution: The second pipe body includes a lower three-way connecting pipe and a lower end connecting member, and the structure of the lower end connecting member is the same as that of the upper end connecting member.
[0011] Further technical solution: Second corrugated damping pipes are fixedly connected to both output ends of the lower three-way connecting pipe, and the two first corrugated damping pipes provided on the first pipe body are bolted to the two second corrugated damping pipes provided on the second pipe body.
[0012] Further technical solution: The first pipe body and the second pipe body are connected to form an elliptical pipe body, and a side flow cavity is provided inside the elliptical pipe body.
[0013] Further technical solution: A sliding rod assembly is slidably disposed between the first corrugated damping pipe and the second corrugated damping pipe. The sliding rod assembly includes an outer sliding threaded rod and a damping spring, and the damping spring is disposed outside the outer sliding threaded rod.
[0014] Further technical solution: A sealing ring is provided at the connection between the first corrugated damping pipe and the second corrugated damping pipe, and sealing rings are also provided at the end connections of the upper end connecting member and the lower end connecting member.
[0015] Compared with the prior art, the utility model has the following beneficial effects:
[0016] In a pressure equalizing pipe of a water turbine top cover of the present utility model, by providing a first corrugated shock-absorbing pipe and a second corrugated shock-absorbing pipe, when vibration is conducted from the water turbine to this device, it will pass through the upper connecting piece, the upper three-way connecting pipe, then to the first corrugated shock-absorbing pipe, and then be transmitted to the two second corrugated shock-absorbing pipes, and finally reach the lower connecting piece; the first flange connecting piece, the second flange connecting piece and the damping spring in the present utility model act together to relieve vibration and prevent structural deformation; the design of the shock-absorbing corrugated pipe and the position-limiting spring can effectively absorb and disperse the vibration energy, limit excessive bending, ensure that when the whole system suffers from large vibration forces, the deformation and sliding limit structure of the first corrugated shock-absorbing pipe and the second corrugated shock-absorbing pipe can reasonably guide the pressure to be conducted downward, ultimately protecting the lower connecting piece and the entire lower pipe body from being affected by excessive vibration, ensuring the safe and stable operation of the equipment under various working conditions, avoiding potential risks such as the phenomenon of machine lifting, and moreover, through the deformation and sliding limit structure of the first corrugated shock-absorbing pipe and the second corrugated shock-absorbing pipe, the vibration energy conducted from the water turbine can be effectively absorbed and dispersed, greatly reducing the vibration stress borne by the lower connecting piece and the entire lower pipe body; this not only protects the key components from damage, but also improves the operation stability of the whole system under complex working conditions, reduces potential safety hazards such as the phenomenon of machine lifting, ensures the long-term safe operation of the equipment, and the design of the shock-absorbing corrugated pipe and the position-limiting spring can limit the excessive bending of the pipeline, reduce the metal fatigue caused by vibration, thereby extending the service life of the pipeline and the connecting components, reducing the maintenance and replacement costs, and the effective vibration control can significantly reduce the noise generated during the operation of the equipment, creating a quieter working environment, which is particularly important for places close to residential areas or with strict noise requirements.
[0017] In the present utility model, a pressure equalizing pipe of a turbine cover is provided with a movable anti-blocking device. After the turbine starts, water enters through the upper connecting piece, flows through the inlet side flow cavity, and then discharges from both sides, and finally flows out through the lower connecting piece. When the water flow enters the middle flow cavity, it will pass through specific through holes and impact the movable end plate, causing it to rotate. The rotation of the movable end plate drives the arc-shaped blades to form a turbine effect, further driving the extrusion push rod to rotate. The rotation of the extrusion push rod will synchronously drive the spiral guide vane to rotate. During this process, the movable end plate is forced to move downward due to the impact of the water flow, and realizes reciprocating up and down movement by relying on the elastic restoring force of the return spring. At the same time, the extrusion push rod also rotates and moves up and down correspondingly. The water flow enters through the upper connecting piece and passes through the flow path, effectively utilizing the water energy to impact the movable end plate, and then converting it into mechanical energy. The movable end plate drives the turbine to rotate. This process realizes the efficient conversion of water energy into mechanical energy, improves the working efficiency of the turbine, and the movable end plate generates reciprocating up and down movement under the impact of the water flow, similar to an automatic regulating valve, which can self-adjust the opening according to the water flow intensity, so as to optimize the energy absorption and ensure that the turbine can maintain efficient and stable operation under different flow rates. Moreover, the linkage rotation design of the extrusion push rod and the spiral guide vane helps to smooth the power transmission and reduce the vibration and noise during operation. The application of the return spring enables the movable components to quickly return to their positions after being impacted by the water flow, maintaining the stability and continuous operation of the system. Description of the Drawings
[0018] Figure 1 is the overall structural schematic diagram of the present utility model;
[0019] Figure 2 is the front structural schematic diagram of the present utility model;
[0020] Figure 3 is the top structural schematic diagram of the present utility model;
[0021] Figure 4 is the front sectional structural schematic diagram of the present utility model;
[0022] Figure 5 is the structural schematic diagram of the movable anti-blocking device 29 in the present utility model;
[0023] Figure 6 is the front structural schematic diagram of the movable anti-blocking device 29 in the present utility model.
[0024] Description of the Reference Numerals
[0025] The first pipe body 11, the second pipe body 12, the first flange connecting piece 13, the corrugated pipe 14, the damping spring 15, the second flange connecting piece 16, the upper end connecting piece 17, the upper three-way connecting pipe 18, the shock-absorbing corrugated pipe 19, the end flange piece 20, the position-blocking spring 21, the end connecting piece 22, the middle corrugated pipe 23, the lower three-way connecting pipe 24, the lower end connecting piece 25, the first corrugated shock-absorbing pipe 26, the side flow cavity 27, the middle flow cavity 28, the movable anti-blocking device 29, the upper end fixing plate 30, the movable end plate 31, the arc-shaped blade 32, the return spring 33, the extrusion push rod 34, the spiral guide vane 35, the push plate 36, the outer sliding threaded rod 37, the shock-absorbing spring 38, the second corrugated shock-absorbing pipe 39. Detailed implementation manners
[0026] The following further describes in detail the implementation manners of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.
[0027] In the description of the present utility model, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0029] Embodiment: The present utility model provides a pressure equalizing pipe for the top cover of a water turbine. Refer to the attached Figure 1 to the attached Figure 6, including: a first tube body 11 and a second tube body 12. The first tube body 11 is disposed above the second tube body 12. A middle corrugated tube 23 is connected between the middle parts of the first tube body 11 and the second tube body 12. A middle flow cavity 28 is provided inside the middle corrugated tube 23. An active anti-blocking device 29 is installed in the middle flow cavity 28. The active anti-blocking device 29 includes an upper fixed plate 30, a movable end plate 31, and a pressing push rod 34. The upper fixed plate 30 is fixedly installed on the inner wall of the middle flow cavity 28. A return spring 33 is fixedly connected to the bottom surface of the upper fixed plate 30. The end of the return spring 33 is rotatably connected to the movable end plate 31. A plurality of arc-shaped blades 32 are annularly arranged on the upper side of the movable end plate 31. A pressing push rod 34 is fixedly connected to the lower side of the movable end plate 31. A spiral guide vane 35 is provided outside the pressing push rod 34. A push plate 36 is connected to the end of the pressing push rod 34.
[0030] Preferably, referring to the appendix Figure 2 , the first tube body 11 includes an upper connecting member 17 and a first corrugated shock-absorbing tube 26. The upper end of the first corrugated shock-absorbing tube 26 is fixedly provided with the upper connecting member 17. The lower end of the upper connecting member 17 is connected with an upper three-way connecting tube 18. Both output ends of the upper three-way connecting tube 18 are fixedly connected with the first corrugated shock-absorbing tube 26.
[0031] Preferably, referring to the appendix Figure 2 , the upper connecting member 17 includes a second flange connecting piece 16 and a first flange connecting piece 13. The first flange connecting piece 13 is disposed above the second flange connecting piece 16. A corrugated tube 14 is connected between the second flange connecting piece 16 and the first flange connecting piece 13. A damping spring 15 is provided outside the corrugated tube 14.
[0032] Preferably, referring to the appendix Figure 2 , the first corrugated shock-absorbing tube 26 includes an end flange member 20 and an end connecting piece 22. The end flange member 20 is disposed above the end connecting piece 22. A shock-absorbing corrugated tube 19 is connected between the end connecting piece 22 and the end flange member 20. A blocking spring 21 is provided outside the shock-absorbing corrugated tube 19.
[0033] Preferably, referring to the appendix Figure 2 , the second tube body 12 includes a lower three-way connecting tube 24 and a lower end connecting member 25. The structure of the lower end connecting member 25 is the same as that of the upper end connecting member 17.
[0034] Preferably, referring to the appendix Figure 2, both output ends of the lower three-way connecting pipe 24 are fixedly connected with second corrugated shock-absorbing pipes 39, and the two first corrugated shock-absorbing pipes 26 provided on the first pipe body 11 are bolted to the two second corrugated shock-absorbing pipes 39 provided on the second pipe body 12.
[0035] Preferably, referring to the attached Figure 4 , the first pipe body 11 and the second pipe body 12 are connected to form an elliptical pipe body, and a side flow cavity 27 is provided inside the elliptical pipe body.
[0036] Preferably, referring to the attached Figure 4 , a sliding rod assembly 40 is slidably provided between the first corrugated shock-absorbing pipe 26 and the second corrugated shock-absorbing pipe 39. The sliding rod assembly 40 includes an outer sliding threaded rod 37 and a shock-absorbing spring 38, and the shock-absorbing spring 38 is provided outside the outer sliding threaded rod 37.
[0037] Preferably, referring to the attached Figure 4 , a sealing ring is provided at the connection between the first corrugated shock-absorbing pipe 26 and the second corrugated shock-absorbing pipe 39, and sealing rings are also provided at the end connections of the upper end connector 17 and the lower end connector 25.
[0038] The specific usage method of the present utility model:
[0039] Before using the device of the present utility model, first conduct a comprehensive visual inspection to ensure there are no scratches, deformations or other damages, and clean the inside to remove all impurities. Then, it is necessary to install sealing rings and fasteners (such as bolts, nuts) at the interfaces of the upper end connector 17 and the lower end connector 25, and ensure that these accessories are suitable for installation. After that, accurately mark the installation points of the equalizing pipes on the top cover to ensure the rationality of the pipeline layout and avoid interference with other components. Next, assemble the pipe body spring pipe with the corresponding flanges or joints to form a closed water flow system.
[0040] The working principle of this system is as follows: After the water turbine starts, water enters through the upper end connector 17, flows into the side flow cavity 27, then discharges from both sides, and finally flows out through the lower end connector 25. When the water enters the middle flow cavity 28, it will pass through specific through-holes and impact the movable end plate 31, causing it to rotate. The rotation of the movable end plate 31 drives the arc-shaped blades 32 to form a turbine effect, further driving the extrusion push rod 34 to rotate. The rotation of the extrusion push rod 34 will synchronously drive the spiral guide vanes 35 to rotate. During this process, the movable end plate 31 is forced to move downward due to the impact of the water flow, and realizes reciprocating up and down movement by relying on the elastic restoring force of the return spring 33. At the same time, the extrusion push rod 34 also rotates and moves up and down accordingly.
[0041] When the present utility model is in use, when vibration is conducted from the water turbine to this device, it will pass through the upper connecting piece 17, the upper three-way connecting pipe 18, then to the first corrugated shock-absorbing pipe 26, and subsequently transmitted to the two second corrugated shock-absorbing pipes 39, and finally reach the lower connecting piece 25. The first flange connecting piece 13, the second flange connecting piece 16 and the damping spring 15 in the present utility model act together to relieve vibration and prevent structural deformation. The design of the shock-absorbing corrugated pipe 19 and the position-blocking spring 21 can effectively absorb and disperse vibration energy, limit excessive bending, and ensure that when the entire system is subjected to large vibration forces, the deformation and sliding limit structure of the first corrugated shock-absorbing pipe 26 and the second corrugated shock-absorbing pipe 39 can reasonably guide the pressure to be conducted downward, ultimately protecting the lower connecting piece 25 and the entire lower pipe body from being affected by excessive vibration, ensuring the safe and stable operation of the equipment under various working conditions, and avoiding potential risks such as the phenomenon of machine lifting.
[0042] The embodiments of the present utility model are given for purposes of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.
Claims
1. A pressure equalizing pipe for a water turbine top cover, comprising a first pipe body (11) and a second pipe body (12), characterized in that: The first pipe body (11) is arranged above the second pipe body (12). A middle corrugated pipe (23) is connected to the middle parts of the first pipe body (11) and the second pipe body (12). A middle flow cavity (28) is arranged inside the middle corrugated pipe (23). An active anti-blocking device (29) is installed in the middle flow cavity (28). The active anti-blocking device (29) includes an upper fixed plate (30), a movable end plate (31), and an extrusion push rod (34). The upper fixed plate (30) is fixedly installed on the inner wall of the middle flow cavity (28). A return spring (33) is fixedly connected to the bottom surface of the upper fixed plate (30). The end of the return spring (33) is rotatably connected to the movable end plate (31). A plurality of arc-shaped blades (32) are annularly arranged on the upper side of the movable end plate (31). An extrusion push rod (34) is fixedly connected to the lower side of the movable end plate (31). A spiral guide vane (35) is arranged outside the extrusion push rod (34). A push plate (36) is connected to the end of the extrusion push rod (34).
2. The equalizing pipe for the water turbine top cover according to claim 1, characterized in that: The first pipe body (11) includes an upper connector (17) and a first corrugated shock-absorbing pipe (26). The upper end of the first corrugated shock-absorbing pipe (26) is fixedly provided with the upper connector (17). The lower end of the upper connector (17) is connected to an upper three-way connecting pipe (18). Both output ends of the upper three-way connecting pipe (18) are fixedly connected to the first corrugated shock-absorbing pipe (26).
3. A pressure equalizing pipe for a water turbine top cover according to claim 2, characterized in that: The upper connector (17) includes a second flange connecting piece (16) and a first flange connecting piece (13). The first flange connecting piece (13) is arranged above the second flange connecting piece (16). A corrugated pipe (14) is connected between the second flange connecting piece (16) and the first flange connecting piece (13). A damping spring (15) is arranged outside the corrugated pipe (14).
4. A pressure equalizing pipe for a water turbine top cover according to claim 3, characterized in that: The first corrugated shock-absorbing pipe (26) includes an end flange part (20) and an end connecting piece (22). The end flange part (20) is arranged at the upper end of the end connecting piece (22). A shock-absorbing corrugated pipe (19) is connected between the end connecting piece (22) and the end flange part (20). A blocking spring (21) is arranged outside the shock-absorbing corrugated pipe (19).
5. The equalizing pipe for the water turbine top cover according to claim 4, characterized in that: The second pipe body (12) includes a lower three-way connecting pipe (24) and a lower connector (25). The structure of the lower connector (25) is the same as that of the upper connector (17).
6. A pressure equalizing pipe for a water turbine top cover according to claim 5, characterized in that: Both output ends of the lower three-way connecting pipe (24) are fixedly connected to a second corrugated shock-absorbing pipe (39). The two first corrugated shock-absorbing pipes (26) provided on the first pipe body (11) are bolted to the two second corrugated shock-absorbing pipes (39) provided on the second pipe body (12).
7. A pressure equalizing pipe for a water turbine top cover according to claim 6, characterized in that: The first pipe body (11) and the second pipe body (12) are connected to form an elliptical pipe body. A side flow cavity (27) is arranged inside the elliptical pipe body.
8. A pressure equalizing pipe for a water turbine top cover according to claim 7, characterized in that: A sliding rod assembly (40) is slidably provided between the first corrugated shock-absorbing pipe (26) and the second corrugated shock-absorbing pipe (39). The sliding rod assembly (40) includes an outer sliding threaded rod (37) and a shock-absorbing spring (38), and the shock-absorbing spring (38) is provided outside the outer sliding threaded rod (37).
9. A pressure equalizing pipe for a water turbine top cover according to claim 8, characterized in that: A sealing ring is provided at the connection between the first corrugated shock-absorbing pipe (26) and the second corrugated shock-absorbing pipe (39). Sealing rings are also provided at the end connections of the upper end connector (17) and the lower end connector (25).