Water wheel maintenance after the volute water filling system

Abstract

The application provides a water turbine maintenance post-volute water filling system, which comprises a pump body and a water filling pipe connected with a pump-out pipe of the pump body, an outlet block is arranged at an end of the water filling pipe away from the pump-out pipe, a first cavity is arranged in the outlet block, the water filling pipe is communicated with the first cavity, an outlet is further arranged on the outlet block and communicated with the first cavity, a first pressure sensor is further arranged on the outlet block and located outside the first cavity, a second pressure sensor is further arranged on the water filling pipe and located at an end of the water filling pipe close to the pump-out pipe, and a moving wheel and a floating plate are further arranged on the outlet block. The application solves the problem that the water turbine equipment may be damaged due to direct water flushing by opening a valve in the prior art.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment for the maintenance of hydro-generator sets, and in particular to a water filling system for the spiral casing after turbine maintenance. Background Technology

[0002] During major overhauls of hydro-generator units, the water inside the spiral casing needs to be drained to facilitate maintenance work. After the overhaul, before starting the unit for testing, the spiral casing needs to be refilled with water; otherwise, the strong water flow and pressure can significantly impact the power generation equipment, potentially damaging the turbine. Current technology typically involves directly introducing water through a valve, but this still causes water to impact the turbine, potentially damaging it. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a water filling system for the spiral casing after turbine maintenance, which solves the problem that directly flushing water by opening valves may damage the turbine equipment in existing technologies.

[0004] According to an embodiment of the present invention, a turbine casing water filling system after maintenance includes a pump body and a water filling pipe connected to the pump outlet pipe of the pump body. A water outlet block is installed at the end of the water filling pipe opposite to the pump outlet pipe. A first cavity is provided inside the water outlet block, and the water filling pipe communicates with the first cavity. A water outlet port communicating with the first cavity is also provided on the water outlet block. A first pressure sensor located outside the first cavity is also installed on the water outlet block, and a second pressure sensor located near the pump outlet pipe is also installed on the water filling pipe. The water outlet block is also equipped with a moving wheel and a floating plate.

[0005] In the above embodiments, the water outlet block can be pushed deep into the volute through the water filling pipe. Then, the pump body pumps water into the volute, and after passing through the water filling pipe, the water outlet block deep into the volute enters the volute. The water is gradually injected from the inside out and the liquid level rises. This water filling is more gentle, so the impact on the turbine equipment is smaller, which solves the problem that the turbine equipment may be damaged by directly flushing water by opening the valve in the prior art.

[0006] Furthermore, a pair of mounting plates are fixedly connected to the water outlet block, and a mounting shaft is fixedly connected between the two mounting plates. The movable wheel includes a pair of wheels that are rotatably mounted on the mounting shaft and located at both ends of the mounting shaft. The floating plate is located on the side of the water outlet block opposite to the movable wheel.

[0007] Furthermore, a recessed plate located between the water outlet block and the mounting shaft is also fixedly connected to the water outlet block.

[0008] Furthermore, it also includes a connecting block, which has a second cavity. The end of the water filling pipe facing away from the water outlet block is connected to the second cavity. The second pressure sensor is installed on the connecting block and connected to the second cavity. A connecting pipe connected to the second cavity is also fixedly connected to the connecting block. The pump outlet pipe is connected to the connecting pipe.

[0009] Furthermore, the outer wall of the connecting pipe is provided with an external thread section, and the pump outlet pipe is also threadedly connected with a mating sleeve, and the inner wall of the mating sleeve is provided with an internal thread section that mates with the external thread section.

[0010] Furthermore, an elastic ring that abuts against the connecting block is fixedly connected to the outside of the connecting pipe, and the mating sleeve includes a mating surface that abuts against the elastic ring.

[0011] Furthermore, the elastic ring has a recessed annular groove surrounding the connecting pipe on the side that contacts the mating surface. A metal ring is fitted into the annular groove, and the metal ring includes a portion located outside the annular groove. A mating groove is recessed on the mating surface to accommodate the portion of the metal ring located outside the annular groove.

[0012] Furthermore, the metal ring includes a wedge-shaped portion and an arc-shaped portion, the wedge-shaped portion being engaged in the ring groove, and the arc-shaped portion being engaged in the mating groove.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The water pumped in through the filling pipe enters the volute from deep within it, which is gentler than direct water injection and causes less impact on the turbine equipment. This solves the problem of potential damage to the turbine equipment caused by directly flushing water through valve opening in existing technologies. By comparing the values ​​between the first and second pressure sensors, the water pressure inside the volute can be clearly understood. When the two values ​​are equal, the flushing can be stopped to better prevent over-flushing and save time while improving efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the water outlet block structure according to an embodiment of the present invention;

[0017] Figure 3 for Figure 1 Enlarged schematic diagram of a local structure at point A;

[0018] Figure 4 This is a schematic diagram of the connecting pipe and mating sleeve structure according to an embodiment of the present invention;

[0019] In the above attached figures:

[0020] Pump body 1, pump outlet pipe 2, water filling pipe 3, water outlet block 4, first cavity 5, first pressure sensor 6, second pressure sensor 7, moving wheel 8, floating plate 9, volute 10, mounting plate 11, mounting shaft 12, sink plate 13, connecting block 14, second cavity 15, connecting pipe 16, docking sleeve 17, elastic ring 18, metal ring 19. Detailed Implementation

[0021] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0023] like Figure 1 , 2 As shown in Figure 3, this embodiment provides a water filling system for the spiral casing after turbine maintenance, which includes a pump body 1 and a water filling pipe 3 connected to the pump outlet pipe 2 of the pump body 1. A water outlet block 4 is installed at the end of the water filling pipe 3 away from the pump outlet pipe 2. A first cavity 5 is provided inside the water outlet block 4. The water filling pipe 3 communicates with the first cavity 5. A water outlet port communicating with the first cavity 5 is also provided on the water outlet block 4. A first pressure sensor 6 located outside the first cavity 5 is also installed on the water outlet block 4. A second pressure sensor 7 located near the pump outlet pipe 2 is also installed on the water filling pipe 3. The water outlet block 4 is also equipped with a moving wheel 8 and a floating plate 9.

[0024] In the above embodiment, the water outlet block 4 is pushed deep into the volute 10 via the water filling pipe 3. Water is then pumped in by the pump body 1, passes through the water filling pipe 3, and enters the volute 10 through the water outlet block 4 deep within the volute 10. The water gradually flows from the inside out, causing the liquid level to rise. This gentler filling process reduces the impact on the turbine equipment, solving the problem in the prior art where direct water flushing by opening valves could damage the turbine equipment. Specifically, the first pressure sensor 6 at the water outlet block 4 measures the water pressure inside the volute 10, and the second pressure sensor 7 at the other end measures the water pressure during water inflow. When the pressure and volume are roughly equal, water filling can be stopped to avoid excessive water pressure and to indicate that water filling is complete, allowing for subsequent operations. In a more detailed implementation plan, the moving wheels 8 on the water outlet block 4 assist in allowing the water outlet block 4 to enter the volute 10 more smoothly. Specifically, the water outlet block 4 is fed inward through the water filling pipe 3, and the moving wheels 8 cause the water outlet block 4 to move in a rolling manner. At the same time, the water filling pipe 3 is flexible and has certain mechanical properties (e.g., the water filling pipe 3 can be a plastic pipe with a steel mesh), allowing it to move and bend within the volute 10, thus enabling the water outlet block 4 to enter the volute. The deepest part of the shell 10 (the volute 10 has a snail shell structure, and the deepest part is adjacent to the entrance) is where water is first filled to avoid greater impact from the cement. In a more detailed implementation, the floating plate 9 provides buoyancy to the water outlet block 4, allowing it to rise with the water level. This prevents the water outlet block 4 from hitting the bottom of the volute 10 when pulled out, making it easier to pull out of the volute 10 after filling. In a further implementation, a pair of mounting plates 11 are fixedly connected to the water outlet block 4. A mounting shaft 12 is fixedly connected between the two. The movable wheel 8 includes a pair of wheels rotatably mounted on the mounting shaft 12 and located at both ends of the mounting shaft 12. The floating plate 9 is located on the side of the water outlet block 4 away from the movable wheel 8. A sinking plate 13 is fixedly connected to the water outlet block 4 between it and the mounting shaft 12. The sinking plate 13 is provided so that the density of the water outlet block 4 is close to that of water (slightly less than that of water), so that it can submerge slightly when pulled out, be in the upper part of the water and not contact the top surface of the volute 10, thus making it easier to pull outward.

[0025] like Figure 1 , 3As shown in Figure 4, in another embodiment, the turbine casing water filling system after maintenance also includes a connecting block 14. The connecting block 14 has a second cavity 15. The end of the water filling pipe 3 facing away from the water outlet block 4 is connected to the second cavity 15. The second pressure sensor 7 is installed on the connecting block 14 and connected to the second cavity 15. The connecting block 14 is also fixedly connected to a connecting pipe 16 that communicates with the second cavity 15. The pump outlet pipe 2 is connected to the connecting pipe 16. Specifically, the outer wall of the connecting pipe 16 is provided with an external thread section. The pump outlet pipe 2 is also threadedly connected to a mating sleeve 17, and the inner wall of the mating sleeve 17 is provided with an internal thread section that mates with the external thread section. In this way, the water filling pipe 3 and the pump body 1 are detachably connected, and the second pressure sensor 7 measures the water pressure of the second cavity 15, which is more stable than the front end of the pump body 1 (the water pressure is more stable after entering the second cavity 15 than before entering).

[0026] In a more detailed embodiment, an elastic ring 18 that abuts against the connecting block 14 is also fixedly connected to the outside of the connecting pipe 16. The mating sleeve 17 includes a mating surface that abuts against the elastic ring 18. As the mating sleeve 17 rotates, it can contact the elastic ring 18 and gradually tighten the mating surface and the elastic ring 18, thereby preventing water leakage at the threaded connection. Furthermore, an annular groove surrounding the connecting pipe 16 is recessed on the side of the elastic ring 18 that contacts the mating surface. A metal ring 19 is fitted into the annular groove, and the metal ring 19 includes a portion located outside the annular groove. A mating groove is recessed on the mating surface for the portion of the metal ring 19 located outside the annular groove to accommodate. The metal ring 19 is located between the mating surface and the elastic ring 18. As the mating sleeve 17 is tightened, the metal ring 19 is pressed between the two, assisting in the sealing function. In addition, the metal ring 19 also serves as a reinforcing element. The metal ring 19 serves as a support to prevent damage from overpressure to the elastic ring 18. In a more specific embodiment, the metal ring 19 includes a wedge-shaped portion and an arc-shaped portion. The wedge-shaped portion is inserted into the ring groove, and the arc-shaped portion is inserted into the mating groove. The wedge-shaped portion is first inserted into the ring groove to fix the metal ring 19. As the mating sleeve 17 rotates, the arc-shaped portion gradually enters the mating groove (initially without contact, gradually making contact) and eventually slides into contact. Further tightening of the mating sleeve 17 continues until the arc-shaped portion is pressed against the mating groove, at which point a better leak-proof effect is achieved. In a further embodiment, the pump outlet pipe 2 is also provided with the external threaded section. During connection, the mating sleeve 17 is first separated from both external threaded sections (i.e., rotated and fitted onto the pump outlet pipe 2), then aligned with the pump outlet pipe 2 and the connecting pipe 16, and the mating sleeve 17 is rotated so that the internal threaded section engages with both external threaded sections, finally pressing against the metal ring 19.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A water filling system for the spiral casing of a water turbine after maintenance, characterized in that, The device includes a pump body and a water filling pipe connected to the pump body's outlet pipe. A water outlet block is installed at the end of the water filling pipe opposite to the pump outlet pipe. A first cavity is provided inside the water outlet block, and the water filling pipe communicates with the first cavity. An outlet port communicating with the first cavity is also provided on the water outlet block. A first pressure sensor located outside the first cavity is also installed on the water outlet block, and a second pressure sensor located near the pump outlet pipe is also installed on the water filling pipe. The water outlet block is also equipped with moving wheels and a floating plate. A pair of mounting plates are fixedly connected to the water outlet block, and a mounting shaft is fixedly connected between the two mounting plates. The moving wheels include a pair rotatably mounted on the mounting shaft and located at both ends of the mounting shaft. The floating plate is located on the side of the water outlet block opposite to the moving wheels. A recessed plate is also fixedly connected to the water outlet block between itself and the mounting shaft.

2. The turbine casing water filling system after maintenance as described in claim 1, characterized in that, It also includes a connecting block, which has a second cavity. The end of the water filling pipe away from the water outlet block is connected to the second cavity. The second pressure sensor is installed on the connecting block and connected to the second cavity. A connecting pipe connected to the second cavity is also fixedly connected to the connecting block. The pump outlet pipe is connected to the connecting pipe.

3. The turbine casing water filling system after maintenance as described in claim 2, characterized in that, The outer wall of the connecting pipe is provided with an external thread section, and the pump outlet pipe is also threadedly connected with a mating sleeve, and the inner wall of the mating sleeve is provided with an internal thread section that mates with the external thread section.

4. The turbine casing water filling system after maintenance as described in claim 3, characterized in that, An elastic ring that abuts against the connecting block is also fixedly connected to the outside of the connecting pipe, and the mating sleeve includes a mating surface that abuts against the elastic ring.

5. The turbine casing water filling system after maintenance as described in claim 4, characterized in that, The elastic ring has a recessed groove on the side that contacts the mating surface, which surrounds the connecting pipe. A metal ring is fitted into the groove, and the metal ring includes a portion located outside the groove. A mating groove is recessed on the mating surface to accommodate the portion of the metal ring located outside the groove.

6. The turbine casing water filling system after maintenance as described in claim 5, characterized in that, The metal ring includes a wedge-shaped portion and an arc-shaped portion, the wedge-shaped portion being inserted into the ring groove and the arc-shaped portion being inserted into the mating groove.

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