CN2518773Y

CN2518773Y - High-efficiency impeller

Info

Publication number: CN2518773Y
Application number: CN 02203625
Authority: CN
Inventors: 王桂军
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-01-25
Filing date: 2002-01-25
Publication date: 2002-10-30
Anticipated expiration: 2012-01-25

Abstract

The utility model relates to a high efficient impeller, in particular to an impeller without shell in the round which can be used as the thrusting device of the ships and the blade of the radiating fan. The utility model comprises a hub(2) and a pair of blade(1) fixed on the hub. The utility model is characterized in that each blade is fixed with at least a medium conducting blade(3) which takes the hub axis center as the center and is round distributed; and the included angle between the conducting blade and the blade alpha is eighty to one hundred degree. The utility model can solve the problem of the prior art which has a small thrusting force to the ships and has a small radiating fan volume when the shell can not be arranged in the round of the impeller such as the thrusting device and the fan blade for radiating.

Description

Efficient impeller

Technical field

The utility model relates to a kind of impeller.Especially a kind of its do not have the impeller of shell on every side.It can be used as the propelling unit of boats and ships, and the blade of the fan of heat transmission.

Background technology

Existingly be used to advance the blade of boats and ships or the blade of various heat transmissions, its structure can see from Fig. 5 and Fig. 6 that it contains wheel hub 2 and one group of blade 1 that is cemented on the wheel hub.According to hydromechanical principle: the same fluid in the same environment under two kinds of different state of kinematic motions, its static pressure P and dynamic pressure ρ v ²/ 2 sums are definite value, that is: P ₁+ ρ v ₁ ²/ 2=P ₂+ ρ v ₂ ²/ 2; Impeller is in rotation, along its radially everywhere linear velocity have nothing in common with each other, because the flow velocity of medium tangential direction is directly proportional with the linear velocity of blade, so radially the tangential flow velocity of medium everywhere is also different: near more from the impeller axle center, the linear velocity of medium is low more, dynamic pressure is low more, static pressure is high more, so the medium at center flows to the periphery; The flow direction of medium be not along impeller axially, but the medium axial flow velocity and the resulting velocity direction of flow velocity radially.Relational expression (υ=r of the linear velocity υ of each point, angular velocity omega, helicallobe radius r three from the blade ^*ω) as can be known, same impeller becomes ratio just (angular velocity omega of same impeller is identical) in the difference of the linear velocity υ of diverse location with the difference of radius r, so the flow velocity V of the tangential direction of each point place medium is directly proportional with the radius r of blade on the blade, that is to say, axle apart from impeller is far away more, and the flow velocity of medium is high more.By P ₁+ ρ v ₁ ²/ 2=P ₂+ ρ v ₂ ²/ 2 as can be known, and flow velocity V is high more, the dynamic pressure ρ v of medium ²/ 2 is big more, and P is more little for static pressure, and under the effect of differential static pressure, medium must flow to the low place of static pressure from the high place of static pressure, thus around the impeller and the medium at impeller center will be with the edge of different velocity flow to impeller, that is flow to the big place of dynamic pressure.In addition, because fluid medium has certain viscosity, impeller has certain centrifugal action on medium when rotating, and medium is gone up at the radial direction (being normal direction) of impeller produced certain acceleration; Owing to the pressure differential reason, medium also has certain acceleration on normal direction simultaneously.Can have the shortcoming of impeller according to this principle, be that it is when work, medium is big by its angle to external diffusion behind the blade, the medium before the impeller is less to the amount that the blade place replenishes, so when not having the shell encirclement around the impeller, for example as the propelling unit of boats and ships or the fan blade of various radiatores, its propulsive force or to incite air quantity less.

Summary of the invention

The utility model is that a kind of efficient impeller will be provided, with solve in the above-mentioned prior art can't with the impeller of shell in use propulsive force or incite the air quantity problem of smaller.

The efficient impeller of the utility model, it contains wheel hub and one group of blade that is cemented on the wheel hub, be characterized in: on its each blade fixed at least one with the wheel hub axle center be the center and in the medium flow deflector that circumferentially distributes, the angle α between this flow deflector and the blade is 80-100 °.

The efficient impeller of the utility model, the ratio of the length L of its medium flow deflector and blade diameter D is preferably (1/10-1/20).

The efficient impeller of the utility model, its blade quantity is preferably even number, and is symmetric arrangement.Keeping medium in the application force of impeller radius direction balance mutually, thus the service life of raising impeller bearing.

The beneficial effects of the utility model are: the utility model provides a kind of to change blade plan form, the efficient impeller that the medium breather vane comes boot media to flow to is installed, and it has solved the efficient that improves impeller around impeller under the condition that shell can't be installed.When it is used as the fan of various heat exchangers, charge air by it is increased, be that fan air flow strengthens, improve heat exchanger convection transfer rate, strengthened the thermolysis of heat exchanger, under the situation that does not change fan power, can improve fan air flow, thereby improve the radiating efficiency of radiator; When it is used as the spiral leaf oar of various boats and ships, at this moment the fluid medium by it is a water, by momentum theorem (Ft=m υ) as can be known, (wherein m/t is the quality of the water by the leaf oar in the unit time to the propelling thrust F=m υ/t of boats and ships, υ be by the water of leaf oar flow velocity with the travel direction of boats and ships on component velocity), the effect of medium breather vane has not only improved in the unit time quality m/t by the water of blade; Simultaneously the angle of diffusion of water reduce water is increased at the component velocity υ of ship running direction, so the propelling thrust F of boats and ships will increase greatly, improve greatly at the moving velocity of the next boats and ships of situation that do not increase leaf oar power.

To and contrast accompanying drawing by embodiment below is further described below the utility model.

Description of drawings

Fig. 1 and Fig. 2 are the constructionals drawing of efficient impeller first embodiment of the utility model, and wherein Fig. 1 is that front view, Fig. 2 are the A-A cutaway views among Fig. 1;

Fig. 3 and Fig. 4 are the constructionals drawing of efficient impeller second embodiment of the utility model, and wherein Fig. 3 is that front view, Fig. 4 are the B-B cutaway views among Fig. 3;

Fig. 5 and Fig. 6 are blade wheel structure figure of the prior art; Wherein Fig. 5 is that its front view, Fig. 6 are the C-C cutaway views among Fig. 5.

The specific embodiment

Embodiment 1. present embodiments can be seen from Fig. 1 and Fig. 2, it contains wheel hub 2 and six and is symmetry and is cemented in blade 1 on the wheel hub 2, all having an axle center with wheel hub on the outer rim of its each blade is the medium flow deflector 3 that center and edge circumferentially distribute, angle α between this flow deflector and the blade chooses in 80-100 ° scope, and this example is 80 °; And the D of the length L of medium flow deflector 3=(1/10-1/20) is 1/19 in this example.

Embodiment 2. present embodiments can see from Fig. 3 and Fig. 4, and it is with embodiment 1 different is its each blade has from outer rim to center three axle center with wheel hub are center and along the medium flow deflector 3 that circumferentially distributes.

What and the position of installing of medium flow deflector quantity is that diameter, the rotating speed according to impeller determined.In small-sized impeller, can adopt inblock cast between flow deflector and the blade; For in, large-scale impeller, then can adopt welding or bolted connection between the two.

Claims

1, a kind of efficient impeller, it contains wheel hub (2) and one group of blade (1) that is cemented on the wheel hub, it is characterized in that: a fixed at least axle center with wheel hub is center and the medium flow deflector (3) that is circumferential distribution on its each blade, and the angle α between this flow deflector and the blade is 80-100 °.

2, efficient impeller according to claim 1 is characterized in that: the ratio of the length L of said medium flow deflector and blade diameter D is (1/10-1/20).

3, efficient impeller according to claim 1 and 2 is characterized in that: the quantity of said blade (1) is even number, and is symmetric arrangement.