Top cover of pump turbine

Abstract

The utility model relates to the technical field of hydroelectric equipment, in particular to a pump turbine top cover which comprises a lower annular plate and a plurality of rib plates arranged on the lower annular plate. A guide vane connecting piece, a control ring connecting piece and a water guide bearing connecting piece which are sequentially connected with the upper surface of the rib plate are further included in the radial direction of the lower ring plate; the guide vane connecting piece, the control ring connecting piece and the water guide bearing connecting piece are annular and are arranged at intervals. Through the top cover, the problems of poor fatigue strength and small operation space can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water and electricity equipment, in particular to a water pump water turbine top cover. BACKGROUND

[0002] The conventional top cover is divided into two halves, has an upper ring plate and an outer stand. The gusset plate is relatively thin and is welded to the outer stand, the inner stand, the upper ring plate and the lower ring plate. In recent years, the demand for peak load shifting of the power grid is increasing. In order to facilitate the scheduling of the power grid, the working condition of the water pump water turbine gradually tends to long-term wide load operation, the working condition is complex and changes rapidly, resulting in complex deformation and vibration of the top cover and other components. The top cover needs better rigidity and strength to eliminate harmful vibration and deformation. At the same time, the weak parts such as pipes are more prone to fatigue failure, water leakage and even rupture. After the pipeline is damaged, the internal space of the top cover is small due to the size limitation of the machine pit, and maintenance is difficult. Especially for the top cover flat compression pipe, the traditional scheme welds steel on the gusset plate, and then uses a pipe clamp to fix the flat compression pipe on the steel, which is more easily affected by the deformation and vibration of the top cover. In addition, when the flat compression pipe is flat compressed, the working medium often contains a large amount of silt, and the weld is more prone to damage due to erosion.

[0003] In the prior art, a Chinese invention patent document with publication number CN117889029A and publication date of April 16, 2024 is also proposed. The technical solution disclosed in the patent document is as follows: A water turbine top cover and a water turbine, the water turbine top cover comprising: an outer top cover comprising a first upper ring plate, a first lower ring plate and a first rib plate, the first upper ring plate and the first lower ring plate being oppositely arranged, and the opposite ends of the first rib plate being connected with the first upper ring plate and the first lower ring plate respectively; an inner top cover nested with the outer top cover, the inner top cover comprising a second upper ring plate, a second lower ring plate and a second rib plate, the second upper ring plate and the second lower ring plate being oppositely arranged, and the opposite ends of the second rib plate being connected with the second upper ring plate and the second lower ring plate respectively, the outer edge of the second upper ring plate being connected with the inner edge of the first upper ring plate, and the outer edge of the second lower ring plate being connected with the inner edge of the first lower ring plate.

[0004] The above technical solution divides the top cover into an outer top cover and an inner top cover, and the split design makes the connecting components prone to fatigue failure, and the operation space is small. It is very difficult for workers to enter the interior after installation is completed, and it is difficult to observe and maintain without disassembling the machine. SUMMARY

[0005] To solve the above technical problems, the utility model provides a water pump water turbine top cover, which can effectively solve the problems of poor fatigue strength and small operation space.

[0006] The utility model is implemented by adopting the following technical solutions:

[0007] A water pump water turbine top cover, comprising a lower ring plate and a plurality of rib plates arranged on the lower ring plate, and further comprising, along the radial direction of the lower ring plate, a guide vane connecting piece, a control ring connecting piece and a water guide bearing connecting piece connected to the upper surface of the rib plate in sequence, wherein the guide vane connecting piece, the control ring connecting piece and the water guide bearing connecting piece are annular and spaced from each other.

[0008] The lower ring plate and the rib plate are integrally formed.

[0009] The rib plate is provided with a plurality of reserved holes.

[0010] The guide vane connecting piece, the control ring connecting piece and the water guide bearing connecting piece are integrally formed.

[0011] The guide vane connecting piece, the control ring connecting piece and the water guide bearing connecting piece are respectively in a split structure connected through connecting flanges.

[0012] Further comprising a top cover flange located at the outer end of the lower ring plate, wherein the top cover flange is connected to the lower ring plate and the rib plate respectively.

[0013] Further comprising a fixed ring plate located at the inner end of the lower ring plate, wherein the fixed ring plate is connected to the lower ring plate and the rib plate respectively.

[0014] The inner end of the rib plate is provided with a clamping groove matched with the fixed ring plate, and the rib plate is clamped on the upper surface of the fixed ring plate through the clamping groove.

[0015] The top cover flange, the fixed ring plate and the lower ring plate are integrally formed.

[0016] The lower surface of the fixed ring plate is further provided with an annular groove.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1、In the utility model, the guide vane connecting piece, the control ring connecting piece and the water guide bearing connecting piece are respectively and spaced arranged on the upper surface of the rib plate, which greatly increases the observation and operation space of workers, facilitates the installation of various pipelines, and is easy to maintain after installation; and according to finite element calculation, the part connected between each ring has less influence on stress, the utility model can reduce the processing and welding workload, and the fatigue strength of the top cover of the utility model is strong.

[0019] 2、The lower ring plate and the rib plate are integrally formed, and the setting of the components makes the steel plate welding amount in the utility model much smaller than that in the conventional scheme, the welding amount is only about 10% of that in the traditional scheme, the welding deformation is small, the processing amount reserved during design is less, and the production cycle can be effectively shortened.

[0020] 3. In this utility model, the stiffening plate is provided with several reserved holes, so that various pipeline structures, including water and gas pipelines, measuring pipelines, sensing lines, etc., can be reserved in the stiffening plate. This allows the pipelines in this utility model to be formed by casting the stiffening plate. Due to the large thickness of the stiffening plate, its strength far exceeds that of conventional top cover pipelines, and fatigue failure will not occur.

[0021] 4. The guide vane connector, control ring connector, and water guide bearing connector are all integrally formed, resulting in high strength.

[0022] 5. The guide vane connector, control ring connector, and water guide bearing connector are all of the split structure. In case of damage, any corresponding component can be replaced individually, reducing maintenance costs.

[0023] 6. The interplay of stiffening plates, top cover flanges, fixing ring plates, and lower ring plates makes the structural layout more rational, improving the overall strength and stability of the structure. The slot design facilitates better positioning and enhances the stability of the connection between the stiffening plates and the fixing ring plates.

[0024] 7. The annular groove facilitates better connection of the top cover leak-proof ring. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of the structure of the present invention. Figure One ;

[0027] Figure 2 This is a schematic diagram of the structure of the present invention. Figure Two ;

[0028] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0029] Marked in the image:

[0030] 1. Lower ring plate, 2. Rib plate, 3. Guide vane connector, 4. Control ring connector, 5. Water guide bearing connector, 6. Reserved hole, 7. Top cover flange, 8. Fixed ring plate, 9. Slot, 10. Annular groove. Detailed Implementation

[0031] Example 1

[0032] As a basic embodiment of this utility model, the utility model includes a water pump turbine top cover, comprising a lower ring plate 1 and a plurality of stiffening plates 2. The stiffening plates 2 are respectively arranged at intervals along the circumference of the lower ring plate 1. Each stiffening plate 2 is arranged along the radial direction of the lower ring plate 1, that is, the length direction of the stiffening plate 2 is the same as the radial direction of the lower ring plate 1.

[0033] Further comprising, along the radial direction of the lower ring plate 1, in sequence, a guide vane connecting piece 3, a control ring connecting piece 4 and a water guide bearing connecting piece 5 connected to the upper surface of the rib plate 2.

[0034] Embodiment 2

[0035] As a preferred embodiment of the utility model, the utility model discloses a water pump water turbine top cover, including lower ring plate 1 and the several rib plate 2 of setting on lower ring plate 1. Further comprising, along the radial direction of the lower ring plate 1, in sequence, a guide vane connecting piece 3, a control ring connecting piece 4 and a water guide bearing connecting piece 5 connected to the upper surface of the rib plate 2.

[0036] The lower ring plate 1 and the rib plate 2 are integrally formed. The guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 are also integrally formed. The lower ring plate 1 is further provided with a top cover flange 7 and a fixed ring plate 8 welded at both ends respectively, and the both ends of the rib plate 2 are welded with the top cover flange 7 and the fixed ring plate 8 respectively.

[0037] Embodiment 3

[0038] As another preferred embodiment of the utility model, the utility model discloses a water pump water turbine top cover, including lower ring plate 1 and the several rib plate 2 of setting on lower ring plate 1. Further comprising, along the radial direction of the lower ring plate 1, in sequence, a guide vane connecting piece 3, a control ring connecting piece 4 and a water guide bearing connecting piece 5 connected to the upper surface of the rib plate 2.

[0039] The lower ring plate 1 and the rib plate 2 are integrally formed. The guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 are integrally formed through connecting flanges. The guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 can be two-part structure, or the number of parts can be determined by the number of guide vanes.

[0040] Embodiment 4

[0041] As still another preferred embodiment of the utility model, refer to the description attached Figure 1 and the description attached Figure 2The utility model discloses a water pump water turbine top cover, including lower ring plate 1, the web 2, the guide vane connecting piece 3, the control ring connecting piece 4, the water guide bearing connecting piece 5, the top cover flange 7, the fixed ring plate 8 and a plurality of webs 2. Among them, a plurality of webs 2 are spaced apart along the circumferential direction of lower ring plate 1 respectively, and every web 2 is arranged along the radial direction of lower ring plate 1 respectively, that is, the length direction of web 2 is same with the radial direction of lower ring plate 1. In the embodiment, the thickness of web 2 is thickening design. Specifically, the thickness of conventional web 2 is generally 100mm-150mm, and in the embodiment, the thickness of web 2 is more than 280mm, and the maximum thickness of web 2 is limited by guide vane distribution circle and guide vane size.

[0042] Referring to the drawings Figure 3 The top cover flange 7 and the fixed ring plate 8 are located at the inner and outer ends of the lower ring plate 1 respectively. The inner end of the web 2, i.e. the side close to the fixed ring plate 8, is provided with a clamping groove 9 matched with the fixed ring plate 8, one end of the web 2 is connected with the top cover flange 7, and the other end is clamped on the upper surface of the fixed ring plate 8 through the clamping groove 9. Further, the lower ring plate 1, the top cover flange 7, the fixed ring plate 8 and the plurality of webs 2 can be casted into one body by casting, and the structural strength is ensured by the thickened web 2. Still further, the lower surface of the fixed ring plate 8 is further provided with an annular groove 10. The annular groove 10 is used for connecting a top cover leakage stop ring.

[0043] Along the radial direction of the lower ring plate 1, the guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 are sequentially arranged on the upper surface of the web 2 and are connected with the upper surface of the web 2 respectively. The guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 are annular and are spaced apart from each other, that is, the inner diameters of the guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 are sequentially reduced. The control ring connecting piece 4 is in a stepped shape in cross section.

[0044] Among them, in order to improve the strength, the guide vane connecting piece 3 can be integrally formed, the control ring connecting piece 4 can be integrally formed, and the water guide bearing connecting piece 5 can also be integrally formed.

[0045] Still further, a plurality of reserved holes 6 are arranged in the web 2, so that various pipeline structures, including water and gas pipelines, measurement pipelines, sensing lines and the like, can be reserved in the web 2, and physical pipelines are no longer arranged separately in the top cover.

[0046] During machining, the lower ring plate 1, the top cover flange 7, the fixed ring plate 8 and the plurality of webs 2 are casted into one body by casting, and the top cover bottom, the top cover web and the movable guide vane middle shaft sleeve seat are preliminarily completed; then the guide vane connecting piece 3, the control ring connecting piece 4 and the water guide bearing connecting piece 5 are welded to complete the connection with the web 2.

[0047] Through the above structure, the problems of large welding amount, long production cycle, strength improvement, pipeline damage and difficult maintenance of the existing water pump water turbine top cover can be overcome.

[0048] In summary, the ordinary skilled in the art after reading the utility model file, according to the technical scheme and technical concept of the utility model without creative mental labor makes other various corresponding transformation schemes, all belong to the range of the utility model.

Claims

1. A water pump turbine top cover, comprising a lower ring plate (1) and a plurality of rib plates (2) arranged on the lower ring plate (1); characterized in that: Along the radial direction of the lower ring plate (1), further comprising in turn with the rib plate (2) upper surface connected guide vane connecting piece (3), control ring connecting piece (4) and water guide bearing connecting piece (5); the guide vane connecting piece (3), control ring connecting piece (4) and water guide bearing connecting piece (5) are annular respectively, and are spaced from each other.

2. A pump-turbine top cover according to claim 1, characterized in that: The lower ring plate (1) and the rib plate (2) are integrally formed.

3. A pump-turbine top cover according to claim 1 or 2, characterized in that: The rib plate (2) is provided with a plurality of reserved holes (6).

4. A pump-turbine top cover according to claim 3, characterized in that: The guide vane connecting piece (3), the control ring connecting piece (4) and the water guide bearing connecting piece (5) are integrally formed respectively.

5. A pump-turbine top cover according to claim 3, characterized in that: The guide vane connecting piece (3), the control ring connecting piece (4) and the water guide bearing connecting piece (5) are respectively connected by connecting flanges in a split type structure.

6. A pump-turbine top cover according to claim 3, characterized in that: Further comprising a top cover flange (7) located at the outer end of the lower ring plate (1), the top cover flange (7) is connected with the lower ring plate (1) and the rib plate (2) respectively.

7. A pump-turbine top cover according to claim 6, characterized in that: Further comprising a fixed ring plate (8) located at the inner end of the lower ring plate (1), the fixed ring plate (8) is connected with the lower ring plate (1) and the rib plate (2) respectively.

8. A pump-turbine top cover according to claim 7, characterized in that: The inner end of the rib plate (2) is provided with a clamping groove (9) matched with the fixed ring plate (8), and the rib plate (2) is clamped on the upper surface of the fixed ring plate (8) through the clamping groove (9).

9. A pump-turbine top cover according to claim 8, characterized in that: The top cover flange (7), the fixed ring plate (8) and the lower ring plate (1) are integrally formed.

10. A pump-turbine top cover according to claim 7, characterized in that: The lower surface of the fixed ring plate (8) is further provided with an annular groove (10).

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