CN2310159Y - Centrifugal wing-shaped blade - Google Patents

Abstract

The utility model relates to a centrifugal wing-shaped blade, comprising an impeller wheel hub and blades which are fixed on the impeller wheel hub, which is characterized in that the cross section of each blade is divided into four sides, adjacent blades form a convergent shape fluid acceleration channel, a nozzle, a convergent shape fluid work-applying channel, and the cross section area ratio from the nozzle to the convergent shape fluid work-applying channel is 1: 1.5-1: 20. As the utility model adopts a fluid flow channel structure of two channels and one nozzle between the adjacent blades, causing the work efficiency of a turbine to be improved. Simultaneously, the utility model has the characteristics of simple structure, small size, light weight, easy production, etc. The utility model not only can be applied to a hydraulic turbine and a steam turbine, but also is applicable to a gas turbine.

Description

Centrifugal aerofoil impeller

The utility model relates to receded disk impeller, is specifically related to the improvement of impeller on water turbine, steam turbine and the gas turbine.

At present the electric power of the whole world more than 90% all is that running by turbine obtains, as water turbine, steam turbine etc.Therefore, further simplify the structure of steam turbine and water turbine, and improve the problem that its working efficiency is the continuous research in related domain.Traditional water turbine, the fluid of steam turbine quicken road, nozzle and fluid acting road all to be separated, their complex structure, can cause the friction viscous force of machine inner fluid big, the efficient of acting is low, and its blade is all two faces, be a fluid passage between the adjacent blades, sectional area changes not too greatly in the passage, thereby the efficient that fluid does work in turbine is not very high.

The purpose of this utility model is the defective that overcomes prior art, provides that a kind of simple in structure, change in flow is big, the centrifugal aerofoil impeller of turbine high working efficiency.

The purpose of this utility model realizes by following technical proposal.It comprises impeller hub, blade, and vanes fixed is on wheel hub.Be characterized in blade section is divided into four faces, constitute convergent shape fluid between the adjacent blades and quicken road → nozzle → gradually expanding shape fluid acting road, tail end section long-pending ratio in acting road is 1: 1.5～1: 20 from nozzle to the gradually expanding shape fluid.

The utility model is owing to adopt the fluid channel structure of " two roads, one mouth " between adjacent blades, make the efficient of kinetic energy acting of unit mass fluid be improved, thereby the raising that also obtains of the working efficiency of turbine.Simultaneously it also has simple in structurely, and volume is little, and is in light weight, is easy to characteristics such as manufacturing, not only can be applicable to water turbine, steam turbine, but also applicable to gas turbine.

Description of drawings:

Fig. 1 is the utility model individual blade sectional view;

Fig. 2 is the utility model sectional view.

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, the utility model comprises impeller hub 1, blade 2, and blade 2 is fixed on the impeller hub 1, by wheel hub 1 blade 2 is clamped.The utility model mainly is that the section configuration of blade 2 is improved, and blade 2 section configurations are wing blade, and its front is a smooth arc, and the back side has ups and downs as the aircraft wing back side.Utilize this fluctuating, may command is by the flow of inner fluid passage that adjacent blades is formed, and can in time change in the passage flow direction of fluid and speed everywhere.As shown in Figure 1, all be provided with four faces on the every blade 2,21 for fluid quickens face, and 22 is fluid acting face, and 23 is the suction surface in the fluid acting road, and 24 are suction surface in the fluid acceleration road.Constitute convergent shape fluid between adjacent two blades 2 and quicken 3 → nozzle, 4 → gradually expanding shape fluid acting road 5, road, promptly form " twice one mouth " this structure, can be used for multi-stage impeller.As shown in Figure 2, the height of each fluid passage constantly changes, wherein nozzle 4 to the tail end sectional area in fluid acting road 5 alters a great deal, the ratio of both sectional areas is 1: 1.5～1: 20, promptly under the constant situation of fluid passageway width, channel cross-sectional area A is directly proportional with channel height variation.According to the characteristics of motion of fluid in gradually expanding shape fluid acting road 5, establishing nozzle 4 place's sectional areas is A ₁, flow velocity is V ₁, gradually expanding shape fluid acting road 5 tail end section are long-pending to be A ₂, flow velocity is V ₂, A so ₁V ₁=A ₂V ₂, flow velocity and cross section of fluid channel are long-pending to be inversely proportional to.Can infer thus: the nozzle 4 sectional area A of place ₁So minimum is the flow velocity V at nozzle 4 places ₁Maximum, basis again $E=\frac{1}{2}{\mathrm{<figure-callout\; id="2"\; label="mv"\; filenames="Y9723891800051.png"\; state="\{\{state\}\}">mv</figure-callout>}}^2$ , the kinetic energy E of unit mass m fluid is also maximum; And gradually expanding shape fluid acting road 5 tail end sectional area A ₂Maximum, flow velocity V ₂Minimum, so the kinetic energy E of unit mass m fluid ₂Also minimum, so, unit mass m fluid promotes 2 works of blade in gradually expanding shape acting road 5 $W=\frac{1}{2}{\mathrm{mv}}_1^2-\frac{1}{2}{\mathrm{<figure-callout\; id="2"\; label="mv"\; filenames="Y9723891800051.png"\; state="\{\{state\}\}">mv</figure-callout>}}_2^2$ 。As can be seen from the above equation, work as V ₁One regularly, manages to reduce the flow velocity V after the acting ₂Be one of effective ways that improve the fluid mechanical efficiency.And this " twice one mouth " fluid passage of the utility model design makes V ₂Much smaller than V ₁, make unit mass m fluid promote 2 work W of blade and be improved, the space of an abundance just is provided for the kinetic energy acting that makes full use of high-velocity fluid.

" twice one mouth " of the present utility model the variation and height and the angle of inclination of blade 2 on the core wheel radius of sectional area everywhere can decide according to the actual design needs.

Claims (1)

1, a kind of centrifugal aerofoil impeller, it comprises impeller hub (1), blade (2), blade (2) is fixed on the impeller hub (1), it is characterized in that described blade (2) section is divided into (21), (22), (23), (24) four faces, constitute convergent shape fluid between the adjacent blades (2) and quicken road (3) → nozzle (4) → gradually expanding shape fluid acting road (5), tail end section long-pending ratio in acting road (5) is 1: 1.5～1: 20 from nozzle (4) to the gradually expanding shape fluid.

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