Medium and low water head large-flow hydroenergy power generation diversion system and structure

Abstract

The utility model discloses a medium and low water head large flow water energy power generation diversion system and construction, which comprises two finite element special-shaped volutes which are arranged in a buckling way and a water inlet pipe connected on the finite element special-shaped volutes, and each finite element special-shaped volute comprises a volute body and a special-shaped diversion structure connected on the inner side of the volute body. A water passing channel is formed in the inner side of the volute body, the special-shaped flow guide structure communicates with the water passing channel, and the special-shaped flow guide structure comprises a lower side arc plate, an upper side arc plate and a plurality of fan-like flow guide plates. According to the fan-like flow guide plates, the plane of the water outlet can be closer to moving blades of the water turbine, water energy can play a better pushing force, the effects of improving the water energy utilization rate and increasing the generating capacity are achieved, and meanwhile the fan-like flow guide plates have the advantages of being safer and environmentally friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydropower generation, and in particular relates to a medium and low water head and large flow hydropower generation diversion system and structure. Background Art

[0002] Up to now, the development of hydropower generation technology has adopted the finite element vortex shell method for both high-head and medium-head diversion technologies, while the cross-flow type is generally used for low-head, which has been basically eliminated due to its low work efficiency and small power generation. The development and utilization of the head height of hydropower generation is mainly determined by factors such as terrain and flow. my country is a country with abundant hydropower resources, with a theoretical installed capacity of 690 million Kw. After the completion of the Three Gorges Dam, many large-scale high-head power stations have been built in recent decades, with an installed capacity of nearly 400 million Kw. However, due to resource constraints, it can be said that there are very few high-head power stations that can be built. If we continue to stick to the high-head concept, we can only do nothing. Most of the high-head power stations that have been built are located upstream of larger water systems. The construction of many high dams and large-capacity power stations has provided a more stable water flow and a relatively large flow for the construction of medium-head power stations and low-head power stations behind the dams. However, this does not mean that the utilization rate of water energy will increase accordingly. Although Gezhouba is the first example of low head and large flow in China, it now seems that if we still stay at this foreign technology from half a century ago, it will still be unsatisfactory for the more than 200 million kilowatts of medium and low heads that have yet to be developed. In addition, hydropower projects require large investments, long construction periods, and long service lives. Once built, they are difficult to improve. Blind adoption may leave regrets for future generations, and pumped-storage power stations are incomparable to medium and low head stations.

[0003] How to improve the efficiency of power generation at medium and low heads? One of the key issues is how to improve the diversion system and give full play to the technical advantage that large flow rates can more effectively improve water energy utilization and power generation than small flow rates. Therefore, a medium and low head large flow hydropower diversion system and structure should be provided to improve the power generation efficiency of medium and low heads. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a medium and low head large flow water power generation diversion system and structure in view of the deficiencies in the above-mentioned prior art. The system has a simple structure and a reasonable design. The water flows through two water inlet pipes and enters two finite element special-shaped volutes at the same time. Under the action of the special-shaped diversion structures of the two finite element special-shaped volutes, the direction of the water flow can be changed, and the water flow direction can be made parallel to the working interface of the moving blades of the turbine or the angle between the water flow direction and the working interface of the moving blades of the turbine can be optimized, thereby improving the water energy working efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a medium and low head large flow water power generation diversion system and structure, characterized in that: it includes two finite element special-shaped volutes arranged in a buckled manner and a water inlet pipe connected to the finite element special-shaped volutes, the finite element special-shaped volute includes a volute body and a special-shaped diversion structure connected to the inner side of the volute body, the inner side of the volute body is provided with a water passage in the same direction as the extension direction of the volute body, the special-shaped diversion structure is connected to the water passage, the special-shaped diversion structure includes a lower arc plate, an upper arc plate and a plurality of fan-shaped diversion plates arranged at intervals between the lower arc plate and the upper arc plate, the water inlet end of the water inlet pipe is provided with a vortex guide funnel, the side wall of the vortex guide funnel is connected with at least two water inlets, at least two of the water inlets are tangent to the side wall of the vortex guide funnel, and the output shaft of the turbine and the input shaft of the generator are connected through a transmission shaft.

[0006] The above-mentioned medium and low head large flow hydropower generation diversion system and structure is characterized in that: the volute body is a conical transition pipe, the small diameter end of one conical transition pipe is inserted into the large diameter end of another conical transition pipe, and the water inlet pipe is connected to the large diameter end of the conical transition pipe.

[0007] Compared with the prior art, the utility model has the following advantages:

[0008] 1. Two interlocking finite element shaped volutes are provided, and water inlet pipes are connected to the two finite element shaped volutes. The finite element shaped volutes include a volute body and a shaped flow guide structure. A water passage is provided on the inner side of the volute body, and the shaped flow guide structure is connected to the water passage. In actual use, water flows into the two finite element shaped volutes through the two water inlet pipes at the same time. Under the action of the shaped flow guide structures of the two finite element shaped volutes, the direction of water flow can be changed, and the direction of water flow can be made parallel to the working interface of the moving blades of the turbine or the angle between the direction of water flow and the working interface of the moving blades of the turbine can be optimized, so as to improve the water energy working efficiency, especially in medium and low head hydropower generation equipment, the improvement of working efficiency is very obvious.

[0009] 2. The utility model arranges a vortex guide funnel at the water inlet end of the water inlet pipe, connects at least two water inlets on the side wall of the vortex guide funnel, and at least the two water inlets are tangent to the side wall of the vortex guide funnel. In actual use, water flows into the vortex guide funnel through the at least two water inlets and forms a vortex in the horizontal plane of the vortex guide funnel, which can increase the vortex acceleration of the water flow.

[0010] 3. The length of the water inlet pipe of the utility model is adjustable, so that the water inlet pipe can be applied to different water levels, and the application effect is good.

[0011] 4. The utility model has a simple structure, reasonable design, low manufacturing cost and is easy to promote and apply.

[0012] To sum up, the utility model has a simple structure and a reasonable design. The water flows through two water inlet pipes and enters two finite element special-shaped volutes at the same time. Under the action of the special-shaped guide structures of the two finite element special-shaped volutes, the direction of the water flow can be changed, and the water flow direction can be made parallel to the working interface of the moving blades of the turbine or the angle between the water flow direction and the working interface of the moving blades of the turbine can be optimized, thereby improving the water energy work efficiency.

[0013] The present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the connection relationship between the vortex guide funnel and the water inlet of the utility model.

[0016] Figure 3 It is a bottom view of the finite element special-shaped volute of the utility model.

[0017] Figure 4 for Figure 3 AA section view.

[0018] Description of reference numerals:

[0019] 1—Volume body; 2-1—lower side arc plate; 2-2—upper side arc plate; 2-3—Fan-shaped guide plate; 3—water inlet pipe; 4—Vortex guide funnel; 5—water inlet; 6—turbine; 7—Generator; 8—Transmission shaft. DETAILED DESCRIPTION

[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the utility model includes two finite element shaped volutes arranged in a buckled manner and a water inlet pipe connected to the finite element shaped volutes, the finite element shaped volutes include a volute body 1 and a shaped guide structure connected to the inner side of the volute body 1, the inner side of the volute body 1 is provided with a water passage having the same extension direction as the volute body 1, the shaped guide structure is connected to the water passage, the shaped guide structure includes a lower arc plate 2-1, an upper arc plate 2-2 and a plurality of fan-shaped guide plates 2-3 arranged at intervals between the lower arc plate 2-1 and the upper arc plate 2-2, a vortex guide funnel 4 is provided at the water inlet end of the water inlet pipe, at least two water inlets 5 are connected to the side wall of the vortex guide funnel 4, at least two of the water inlets 5 are tangent to the side wall of the vortex guide funnel 4, and the output shaft of the turbine 6 and the input shaft of the generator 7 are connected through a transmission shaft 8.

[0021] In the present embodiment, two interlocking finite element shaped volutes are provided, and water inlet pipes are connected to the two finite element shaped volutes. The finite element shaped volutes include a volute body 1 and a shaped flow guide structure. A water passage is provided on the inner side of the volute body 1, and the shaped flow guide structure is connected to the water passage. In actual use, water flows into the two finite element shaped volutes through two water inlet pipes at the same time. Under the action of the shaped flow guide structures of the two finite element shaped volutes, the direction of the water flow can be changed, and the water flow direction can be made parallel to the working interface of the moving blades of the turbine 6 or the angle between the water flow direction and the working interface of the moving blades of the turbine 6 can be optimized, thereby improving the water energy working efficiency, especially in medium and low head hydropower generation equipment, the improvement of the working efficiency is very obvious.

[0022] In this embodiment, multiple fan-shaped guide plates 2-3 form multiple water outlets between the lower arc plate 2-1 and the upper arc plate 2-2. Multiple fan-shaped guide plates 2-3 can make the water outlet plane closer to the moving blades of the turbine 6. The working angle of multiple fan-shaped guide plates 2-3 relative to the moving blades of the turbine 6 is closer to the optimal state, so that the water energy can exert a better driving force, which improves the utilization rate of water energy and increases the power generation. In hydropower generation, medium and low head hydropower is relative to high head hydropower, which is a requirement for making full use of water resources, and at the same time has the advantages of being safer and greener and more environmentally friendly.

[0023] In this embodiment, a vortex guide funnel 4 is arranged at the water inlet end of the water inlet pipe, and at least two water inlets 5 are connected to the side wall of the vortex guide funnel 4, and at least two water inlets 5 are tangent to the side wall of the vortex guide funnel 4. In actual use, water flows into the vortex guide funnel 4 through at least two water inlets 5 and forms a vortex in the horizontal plane of the vortex guide funnel 4, which can increase the vortex acceleration of the water flow.

[0024] In this embodiment, the plurality of the fan-shaped guide plates 2 - 3 are arranged at an angle, and the angle between the fan-shaped guide plates 2 - 3 and the horizontal plane is 45°.

[0025] In this embodiment, the volute body 1 is a conical transition pipe, the small diameter end of one conical transition pipe is inserted into the large diameter end of another conical transition pipe, and the water inlet pipe is connected to the large diameter end of the conical transition pipe.

[0026] In this embodiment, the water inlet pipe 3 can also be set as a height-adjustable water inlet pipe, or a lifting device can be set to adjust the height of the water inlet pipe 3. In actual use, when the length of the water inlet pipe is adjustable, the water inlet pipe can be adapted to different water levels, and the application effect is good.

[0027] like Figure 1 , Figure 2, Figure 3 and Figure 4 As shown, in actual use, water flows into two water inlet pipes respectively through two vortex guide funnels 4, and simultaneously enters the finite element shaped volute casing from the two water inlet pipes, and flows down to the working interface of the moving blades of the turbine 6 through the shaped flow guide structure of the finite element shaped volute casing.

[0028] The above description is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiment according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A medium and low head large flow water power generation diversion system and structure, characterized by: The invention comprises two interlocking finite element shaped volutes and a water inlet pipe (3) connected to the finite element shaped volutes, the finite element shaped volute comprising a volute body (1) and a shaped flow guide structure connected to the inner side of the volute body (1), the inner side of the volute body (1) is provided with a water passage in the same direction as the extension direction of the volute body (1), the shaped flow guide structure is connected to the water passage, and the shaped flow guide structure comprises a lower arc plate (2-1), an upper arc plate ( 2-2) and a plurality of fan-shaped guide plates (2-3) arranged at intervals between the lower arc plate (2-1) and the upper arc plate (2-2), the water inlet end of the water inlet pipe (3) is provided with a vortex guide funnel (4), the side wall of the vortex guide funnel (4) is connected with at least two water inlets (5), at least two of the water inlets (5) are tangent to the side wall of the vortex guide funnel (4), and the output shaft of the turbine (6) and the input shaft of the generator (7) are connected via a transmission shaft (8).

2. A medium and low head and large flow hydropower generation diversion system and structure according to claim 1, characterized in that: The volute body (1) is a conical transition pipe, the small diameter end of one conical transition pipe is inserted into the large diameter end of another conical transition pipe, and the water inlet pipe (3) is connected to the large diameter end of the conical transition pipe.

Images