Device for improving water power generation and electric energy conversion system

Abstract

The utility model discloses a device for improving a water power generation and electric energy conversion system, and relates to a technical improvement scheme for two main components and one part of an existing water power generation and electric energy conversion system, in order to further improve the impact force of primary vortex jet flow, a mixed flushing type water turbine is designed. Secondly, in order to enable volute vortex jet flow to be effectively coupled with the stress surface function of the water turbine, a volute water outlet is changed into a calandria, the included angle is adjusted, and it is guaranteed that the three-dimensional included angle (horizontal and vertical, moving blade radial and volute water outlet calandria tangent included angle) of the volute water outlet and the calandria intersects at the center stress area of the moving blade; and thirdly, a vortex line flow guide boosting water tank in the same rotating direction as the water turbine is arranged on the well wall of the water turbine, circumferential thrust is increased, and through the improvement, under the working condition that pressure and flow are matched, the water energy work efficiency can be further improved undoubtedly.

Description

Technical Field

[0001] This application relates to the field of hydropower generation technology, and in particular to an improved device for hydropower generation power conversion system. Background Technology

[0002] It must be acknowledged that since the Gezhouba and Three Gorges Dams, my country has made tremendous achievements in hydropower construction. However, due to our late start and primarily learning from and following traditional European and American technologies, and given that Europe and America have largely completed large-scale development of their hydropower resources, their technologies have stagnated. Consequently, the technologies of my country's existing hydropower stations have essentially remained at the original level. While hydropower stations under construction or planned are characterized by their large scale, no significant progress has been seen in the technology of hydropower operation.

[0003] In recent years, thermal gas energy technology has made significant progress in vortex flow guidance. While hydropower differs from thermal gas energy (which is primarily dependent on potential energy), the principle of hydropower's work is similar. For example, the spiral casing utilizes the vortex principle. However, the spiral casing only completes the first step; subsequent development of turbines has lagged behind, naturally affecting the efficiency of hydropower. The root cause is a lack of understanding of the vortex principle. For instance, the Gezhouba Dam is called a run-of-river type, while the Three Gorges Dam is called a mixed-flow type, and the turbines used are mainly of two types, all based on century-old technology. This inadequate understanding of the principles and concepts is itself a manifestation of lagging behind technological development.

[0004] It should be recognized that the vortex principle is the core theory for improving the efficiency of rotational motion. In fact, the vortex flow exiting the volute, in the various types of hydraulic turbines currently in use, enters as a vortex. Then, between the turbine blades, under the influence of pressure attraction and turbine rotation, the working water flow exhibits a downward-opening vortex shape, a dynamic compression and work process. It cannot be simply defined as radial or axial flow simply because the ends are not visible in the middle.

[0005] Inadequate understanding severely restricts the imagination and improvement of the structural form of relevant components in kinetic energy conversion, resulting in low working efficiency of water turbines in existing hydropower generation technologies.

[0006] Based on the above reasons, the following technical improvement schemes are proposed for the current hydropower generation. Utility Model Content

[0007] This application provides an improved device for converting hydropower into electrical power, thereby solving the aforementioned technical problems.

[0008] This utility model provides an improved device for a hydroelectric power conversion system, comprising a turbine, a spiral casing, a drive shaft, and a concrete structure. The turbine includes a turbine shaft housing and multiple blades arranged in a ring array on the outside of the turbine shaft housing. The turbine and the spiral casing are located inside the concrete structure, and the turbine is connected to the drive shaft. The spiral casing is located at the upper end of the turbine. The blades include propeller-type blades and a shallow spoon-shaped structure with an opening perpendicular to the axis, the shallow spoon-shaped structure being smoothly connected to the propeller-type blades as a single unit.

[0009] In one possible implementation, the upper outer corner of the blade is set to beveled.

[0010] In one possible implementation, the rotational angle of the blade worm is in the range of 90°-150°.

[0011] In one possible implementation, the volute outlet is a vortex jet structure, which is a pipe structure that extends from the inside out and from square to round; the volute outlet pipe is set obliquely downward, and the angle between the volute outlet pipe and the horizontal plane is 15°±3°, and the tangent angle is 45°±5°.

[0012] In one possible implementation, a guide groove for a circumferential auxiliary impact worm is provided on the inner side of the well wall of the concrete structure.

[0013] In one possible implementation, an umbrella-shaped cover is provided above the shallow spoon-shaped structure.

[0014] In one possible implementation, the volute is a finite element irregular volute with dual-pipe water inlet.

[0015] One or more technical solutions provided in the embodiments of this utility model have at least the following technical effects or advantages:

[0016] This utility model embodiment uses a propeller blade as a prototype, modifying its blade surface to a shallow arc concave shape, adding a shallow spoon-shaped portion with an opening perpendicular to the axis at the upper end of the blade, and smoothly connecting it to the lower blade. To improve the entry angle of the jet impacting the blade, the upper outer angle of the blade is set to beveled, and the downward angle of the volute outlet pipe is set to 15°±3°, so that the volute outlet forms a disc-shaped vortex, thereby realizing a vortex jet. In conjunction with the aforementioned blade, the vortex jet impacts the upper part of the vortex blade at a set angle, namely a three-dimensional angle (horizontal: the angle between the turbine spokes and the tangent of the jet vector of the volute outlet pipe). Combined with the circumferential thrust of the auxiliary vortex guide water flow set on the well wall, it drives the turbine to rotate, effectively driving the turbine to rotate. This effectively solves the technical problem of low power efficiency of turbines in hydropower generation, thereby effectively improving the power efficiency of turbines in hydropower generation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of the improved hydropower-electric power conversion system provided in the embodiments of this application;

[0019] Figure 2 A partial cross-sectional view of the blades and umbrella-shaped cover provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of a single blade provided in an embodiment of this application;

[0021] Figure 4 This is a top cross-sectional view of the shallow spoon-shaped structure provided in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the water outlet pipe of the volute.

[0023] Icons: 1-Water turbine; 2-Roller casing; 3-Generator; 4-Outlet pipe; 5-Concrete structure; 6-Water turbine shaft housing; 7-Blade; 8-Propeller blade; 9-Shallow spoon-shaped structure; 10-Umbrella-shaped cover plate; 11-Guide channel; 12-Drive shaft. Detailed Implementation

[0024] 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, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They 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 of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0026] Reference Figures 1-5 This application proposes improvements to the hydropower-electric power conversion system in three aspects.

[0027] 1. A "mixed-flow" water turbine was designed:

[0028] A prototype propeller-type blade was developed, with its blade surface modified to a shallow concave arc. A shallow spoon-shaped section with an opening perpendicular to the axis was added to the upper end of blade 7, and a new blade 7 was smoothly connected to the lower blade 7. To improve the entry angle of the jet impacting blade 7, the outer corner of the upper part of blade 7 was set as an oblique opening. (The density of blade 7 is set according to empirical parameters and actual needs, but it must conform to the three-dimensional angle intersecting at the center of the upper blade 7). The worm gear rotation of blade 7 ranges from 90° to 150°. An umbrella-shaped cover plate 10 is added to its top, and the lower part of the cover plate is connected to the shallow spoon-shaped structure, with the corners of the connection shape all being concave arcs; section AA is a propeller-type blade segment, and section BB is a shallow spoon-shaped structure blade segment.

[0029] 2. Therefore, it is proposed that the outlet of the volute 2 be matched accordingly, changing the dish-shaped vortex of the outlet of the volute 2 to a vortex jet, and transforming it into a pipe arrangement that gradually becomes more circular from the inside out, because a circular shape better matches the jet force convergence characteristics and increases the impact force. Assume the horizontal angle of the water pipe is 15°±3° downwards, and the tangential angle is 45°±5°, both being median values. (No further illustrations are provided). Furthermore, a finite element irregular-shaped volute 2 with dual-pipe water inlet is preferable. Simultaneously, it is required to increase the diameter of the turbine 1 shaft: generally not less than one-quarter of the turbine 1 diameter.

[0030] The modified turbine 1 was named "Mixed-Jet Type". "Mixed-Jet Type" means that the water flow does not enter the turbine 1 in a radial manner, but rather in a vortex jet form at a predetermined angle, i.e., a three-dimensional angle (horizontal: the angle between the turbine 1 spokes and the tangent of the jet direction from the volute 2 outlet pipe). This, combined with the circumferential thrust of the auxiliary vortex guide flow on the well wall, drives the turbine to rotate.

[0031] 3. An auxiliary impact vortex guide channel is installed on the well wall of turbine 1. The water flow direction is the same as the rotation direction of turbine 1, and the lower end is twisted upward, so that the water flows into the turbine 1 blades 7 and is discharged. Although this setting cannot be compared with the effect of the static guide vanes of steam turbine, it will undoubtedly increase the circumferential thrust on turbine 1 under the condition that the water pressure and flow rate are relatively guaranteed.

[0032] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0033] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. An apparatus for improving a water power generation kinetic energy conversion system, characterized by, It includes a water turbine (1), a spiral casing (2), a drive shaft (12), and a concrete structure (5); The turbine (1) includes a turbine shaft housing (6) and a plurality of blades (7) arranged in a ring array on the outside of the turbine shaft housing (6); The water turbine (1) and the volute (2) are located inside the concrete structure (5), and the water turbine (1) is connected to the drive shaft (12); The volute (2) is disposed at the upper end of the water turbine (1); The blade (7) includes a propeller-type blade (8) and a shallow spoon-shaped structure (9) with its opening perpendicular to the axis. The shallow spoon-shaped structure (9) is smoothly connected to the propeller-type blade (8) as a whole.

2. The apparatus for improving the water power generation kinetic energy conversion system according to claim 1, wherein, The upper outer corner of the blade (7) is set in a bevel shape.

3. The apparatus for improving the water power generation kinetic energy conversion system according to claim 1, wherein, The worm rotation of the blade (7) ranges from 90° to 150°.

4. The apparatus for improving the water power generation kinetic energy conversion system according to claim 1, wherein, The outlet of the volute (2) is a vortex jet structure, which is a pipe structure that goes from the inside out and from square to round. The water outlet pipe (4) of the volute (2) is set obliquely downward, and the angle between the water outlet pipe (4) of the volute (2) and the horizontal plane is 15°±3°, and the angle between the tangent in the sagittal direction is 45°±5°.

5. The apparatus for improving the water power generation kinetic energy conversion system according to claim 1, wherein, The inner side of the well wall of the concrete structure (5) is provided with a guide groove (11) for a circumferential auxiliary impact worm.

6. The apparatus for improving the water power generation kinetic energy conversion system according to claim 1, wherein, An umbrella-shaped cover plate (10) is provided above the shallow spoon-shaped structure (9).

7. The apparatus for improving the water power generation kinetic energy conversion system according to claim 1, wherein, The volute (2) is a finite element irregular volute (2) with dual-pipe water inlet.

Images