Novel hydraulic turbine set top cover

Abstract

The utility model discloses a novel hydraulic turbine set top cover, and particularly relates to the technical field of hydraulic turbine sets, the novel hydraulic turbine set top cover comprises an upper annular plate, a middle supporting plate and a lower annular plate, movable guide vane fixing ports are uniformly distributed on the upper annular plate and the lower annular plate in an array mode, movable guide vane plates are rotatably connected in the movable guide vane fixing ports, shaft necks are integrally formed at the two ends of each movable guide vane plate, and the shaft necks are connected with the middle supporting plate. And guide assemblies are arranged at the movable guide vane fixing openings and comprise fixing bases, the fixing bases are fixedly connected to the lower annular plate, the guide assemblies further comprise guide plates rotationally arranged on the fixing bases through rotating shafts, and the four sets of guide plates are evenly distributed in the circumferential direction of the fixing bases in an array mode. The guide plate in the guide assembly can be used for guiding the journals at the two ends of the movable guide vane plate, and when a crane is used for hoisting the movable guide vane plate, the movable guide vane plate can be guided more conveniently, so that the mounting efficiency of the movable guide vane plate can be further improved, and the movable guide vane plate is more convenient and faster to use.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine units, in particular to a novel water turbine unit top cover. Background Art

[0002] As one of the core fixed components of the pump-turbine unit, the top cover plays a dual role of load bearing and current passing in the entire unit. The strength, rigidity and safety reliability of the top cover have a vital impact on the stable operation of the entire unit. In order to meet the ever-changing load requirements of the power grid, the pump-turbine unit needs to experience frequent start-stop, load increase and decrease, load shedding and other harsh transient processes in actual operation.

[0003] During the transient process, the flow inside the pump-turbine is transient and changeable, and the water pressure amplitude is much higher than the rated operating condition of the unit. The top cover structure is subjected to complex and changeable high-amplitude water pressure, and the stress of the top cover is constantly changing with time and the change of working conditions. The high-amplitude non-stable axial water thrust during the transient process causes large deformation and stress concentration on the top cover, which may cause cracks on the top cover structure, damage the top cover structure, and even cause major accidents such as the destruction of the hydropower station and the loss of life. Therefore, studying the stress response of the top cover under high-amplitude water pressure during the transient process is of great significance to the safe operation of the power station.

[0004] The existing Chinese patent number CN219549019U discloses a pump-turbine unit top cover, including an upper ring plate, a middle support plate and a lower ring plate, wherein the upper ring plate and the lower ring plate are connected via the middle support plate, wherein the middle support plate includes a circumferential support rib plate and a radial support rib plate, wherein the circumferential support rib plate and the radial support rib plate are vertically connected to each other and evenly connected between the upper ring plate and the lower ring plate, wherein the circumferential support rib plate and the upper ring plate and the lower ring plate and the radial support rib plate are welded to each other. To improve the connection strength of the top cover, a stress dispersion structure is provided in the stress concentration area where the circumferential support rib plate and the radial support rib plate are connected to improve the stress concentration phenomenon.

[0005] Although the above patent can improve the stress concentration phenomenon by increasing the connection strength of the top cover and setting a stress dispersion structure in the stress concentration area where the circumferential support ribs and the radial support ribs are connected, when installing the movable guide vanes, since the diameters of the movable guide vane fixing ports opened on the upper cover and the lower cover are relatively fixed, when the movable guide vanes are hoisted by a crane, the two ends of the movable guide vanes are not convenient to dock with the movable guide vane fixing ports, which is inconvenient to use.

[0006] Therefore, we make improvements to this and propose a new type of turbine unit top cover. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] The utility model discloses a novel water turbine unit top cover, comprising an upper ring plate, a middle support plate and a lower ring plate, wherein the upper ring plate and the lower ring plate are connected via the middle support plate, the upper ring plate and the lower ring plate are evenly arrayed with movable guide vane fixing openings, the movable guide vane fixing openings are rotatably connected with movable guide vane plates, both ends of the movable guide vane plates are integrally formed with shaft necks, guide assemblies are arranged at the movable guide vane fixing openings, the guide assemblies comprise a fixing seat, the fixing seat is fixedly connected to the lower ring plate, the guide assemblies further comprise a guide plate rotatably arranged on the fixing seat via a rotating shaft, and the guide plates are evenly arrayed in four groups in the circumferential direction of the fixing seat.

[0009] As a preferred technical solution of the utility model, a cavity is opened in the fixed seat for the shaft necks at both ends of the movable guide vane plate to pass through, and a spring is fixedly connected to the back of the guide plate. The spring is set at an inclined angle, and the end of the spring away from the guide plate is fixedly connected to the lower ring plate.

[0010] As a preferred technical solution of the utility model, the fixing seats are symmetrically arranged in two groups in the vertical direction, one group of the fixing seats is fixedly connected to the lower ring plate, and the other group of the fixing seats is fixedly connected to the lower surface of the upper ring plate.

[0011] As a preferred technical solution of the present invention, the opening ends of the guide plates are all provided with rounded corners.

[0012] As a preferred technical solution of the utility model, two adjacent guide plates are fixedly connected by a rubber belt, and the four groups of guide plates enclose a space for guiding the shaft necks at both ends of the movable guide vane plates.

[0013] As a preferred technical solution of the utility model, the middle support plates are evenly distributed in an array around the center of the upper ring plate, and through holes are opened inside the middle support plates.

[0014] The beneficial effect of the utility model is that in the utility model, by setting a guide assembly, the guide plates in the guide assembly can be used to guide the shaft necks at both ends of the movable guide vane plate. When the movable guide vane plate is hoisted by a crane, it is easier to guide the movable guide vane plate, thereby further improving the installation efficiency of the movable guide vane plate, and making it more convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This utility model Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0018] Figure 3 This utility model Figure 1 Enlarged schematic diagram of the structure of part B in the middle.

[0019] In the figure: 1, upper ring plate; 2, lower ring plate; 3, middle support plate; 4, through hole; 5, movable guide vane fixing port; 6, shaft neck; 7, movable guide vane plate; 8, fixing seat; 81, cavity; 9, guide plate; 91, fillet; 10, spring; 11, rubber belt. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] Example: Figures 1 to 3 As shown, the utility model is a novel water turbine unit top cover, including an upper ring plate 1, a middle support plate 3 and a lower ring plate 2, the upper ring plate 1 and the lower ring plate 2 are connected by the middle support plate 3, the upper ring plate 1 and the lower ring plate 2 are evenly arrayed with movable guide vane fixing openings 5, the movable guide vane fixing openings 5 ​​are rotatably connected with movable guide vane plates 7, both ends of the movable guide vane plates 7 are integrally formed with shaft necks 6, and the movable guide vane fixing openings 5 ​​are provided with guide assemblies, the guide assemblies include a fixing seat 8, the fixing seat 8 is fixedly connected to the lower ring plate 2, the guide assembly also includes a guide plate 9 rotatably arranged on the fixing seat 8 through a rotating shaft, and the guide plates 9 are evenly arrayed in four groups in the circumferential direction of the fixing seat 8.

[0022] By utilizing the guide assembly provided on the upper ring plate 1 and the lower ring plate 2, the four groups of guide plates 9 that can be deployed in the guide assembly can be used to guide the installation of the shaft necks 6 integrally formed at both ends of the movable guide vane plate 7, thereby further improving the installation efficiency of the movable guide vane plate 7.

[0023] The fixed seat 8 is provided with a cavity 81 for the shaft necks 6 at both ends of the movable guide vane plate 7 to pass through. The back of the guide plate 9 is fixedly connected with a spring 10 which is arranged at an inclined angle. The end of the spring 10 away from the guide plate 9 is fixedly connected to the lower ring plate 2.

[0024] By utilizing the spring 10 fixedly connected between the back of the guide plate 9 and the lower surface of the upper ring plate 1 and the upper surface of the lower ring plate 2, it is easier to guide the installation position of the shaft neck 6 integrally formed at both ends of the movable guide vane plate 7, making it more convenient to use.

[0025] Two groups of fixing seats 8 are symmetrically arranged in the vertical direction, one group of fixing seats 8 is fixedly connected to the lower ring plate 2 , and the other group of fixing seats 8 is fixedly connected to the lower surface of the upper ring plate 1 .

[0026] By using a set of fixing seats 8 fixedly connected to the lower surface of the upper ring plate 1, it is easier to install the shaft neck 6 at the upper end of the movable guide vane plate 7. At the same time, by using the fixing seats 8 fixedly connected to the upper surface of the lower ring plate 2, it is easier to install the shaft neck 6 at the lower end of the movable guide vane plate 7, thereby improving the installation efficiency of the movable guide vane plate 7.

[0027] The open ends of the guide plates 9 are all provided with rounded corners 91. By utilizing the rounded corners 91 provided at the open ends of the guide plates 9, it is possible to further prevent the guide plates 9 from scratching the surface of the movable guide vane plates 7.

[0028] Two adjacent guide plates 9 are fixedly connected by rubber bands 11, and the four groups of guide plates 9 enclose a space for guiding the journals 6 at both ends of the movable guide vane plate 7. By using the method of fixing two adjacent guide plates 9 by rubber bands 11, when the unfolding state of one group of guide plates 9 changes, the other three groups of guide plates 9 can be driven to move at the same time, which is more convenient to use.

[0029] The middle support plates 3 are evenly distributed in an array around the center of the upper ring plate 1, and through holes 4 are provided inside the middle support plates 3. By utilizing the through holes 4 provided on the middle support plates 3, it is more convenient to guide the water flow.

[0030] During operation, when it is necessary to hoist the movable guide vane plate 7 in the top cover of the new turbine unit, the shaft necks 6 integrally formed at both ends of the movable guide vane plate 7 are placed in the space surrounded by four groups of guide plates 9. Since the two adjacent groups of guide plates 9 are fixed by rubber belts 11, when the shaft necks 6 at both ends of the movable guide vane plate 7 enter the guide space, the four groups of guide plates 9 enclose a space larger than the diameter of the movable guide vane fixing port 5, which can make it easier to install the movable guide vane plate 7.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A novel water turbine unit top cover, comprising an upper ring plate (1), a middle support plate (3) and a lower ring plate (2), wherein the upper ring plate (1) and the lower ring plate (2) are connected via the middle support plate (3), characterized in that: The upper ring plate (1) and the lower ring plate (2) are both uniformly arranged with movable guide vane fixing openings (5), the movable guide vane fixing openings (5) are both rotatably connected with movable guide vane plates (7), both ends of the movable guide vane plates (7) are integrally formed with shaft necks (6), the movable guide vane fixing openings (5) are both provided with guide assemblies, the guide assemblies include a fixing seat (8), the fixing seat (8) is fixedly connected to the lower ring plate (2), the guide assemblies also include a guide plate (9) rotatably arranged on the fixing seat (8) via a rotating shaft, and the guide plates (9) are uniformly arranged in four groups in an array in the circumferential direction of the fixing seat (8).

2. A novel water turbine unit top cover according to claim 1, characterized in that: The fixing seat (8) is provided with a cavity (81) for the shaft necks (6) at both ends of the movable guide vane plate (7) to pass through, and a spring (10) is fixedly connected to the back of the guide plate (9), the spring (10) is arranged at an inclined angle, and one end of the spring (10) away from the guide plate (9) is fixedly connected to the lower ring plate (2).

3. A novel water turbine unit top cover according to claim 2, characterized in that: Two groups of the fixing seats (8) are symmetrically arranged in the vertical direction, one group of the fixing seats (8) is fixedly connected to the lower ring plate (2), and the other group of the fixing seats (8) is fixedly connected to the lower surface of the upper ring plate (1).

4. The novel water turbine unit top cover according to claim 1 is characterized in that: The opening ends of the guide plates (9) are each provided with rounded corners (91).

5. A novel water turbine unit top cover according to claim 4, characterized in that: Two adjacent guide plates (9) are fixedly connected via a rubber belt (11), and the four groups of guide plates (9) enclose a space for guiding the shaft necks (6) at both ends of the movable guide vane plate (7).

6. A novel water turbine unit top cover according to claim 5, characterized in that: The middle support plates (3) are evenly distributed in an array around the center of the upper ring plate (1), and through holes (4) are provided inside the middle support plates (3).

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