CN207033836U - A kind of cross flow fan blade - Google Patents

Abstract

The utility model provides a kind of cross flow fan blade, is axially arranged in a row and formed along blade by several blade units, and the blade unit is that front-end and back-end are in " V " type, and both sides are highly higher than double " V " structures of the rib type of pars intermedia height.Rib structure can suppress the lateral flow of air-flow, and front end " V " shape structure can reduce form drag；The " V " shape structure of rear end, can reduce pressure drag.

Description

A kind of cross flow fan blade

Technical field

The utility model belongs to air-conditioning technical field, and in particular to a kind of cross flow fan blade.

Background technology

With social development, energy-saving and emission-reduction have become whole society's common recognition, realize the situation ten that target for energy-saving and emission-reduction faces Divide sternness.From the point of view of the state of development of current China's building trade, building energy consumption problem can not be ignored, and account for social total energy consumption 50%, and ascendant trend year by year is presented.The energy consumption of heating ventilation air-conditioning system accounts for whole building energy consumption 70% in building energy consumption Left and right.Statistics shows that air-conditioning recoverable amount in China's is about 4.8 hundred million at present.Wherein, blower fan moves original as a kind of in air-conditioning Machine work done is converted into being conveyed the pressure potential of gas and the fluid machinery of kinetic energy, is widely used in the row such as building, traffic Industry.Although the power per Fans is smaller, because application of the blower fan in national economy is extremely wide, the energy consumed every year Account for more than the 10% of world's gross generation.Therefore, the applicating energy-saving engineering design in heating ventilation air-conditioning system, especially to air-conditioning system In system widely used cross flow fan blade optimize design make blower fan reach drag reduction consumption reduction effect there is important practicality Value and social effect.

There is a vortex that can control whole air current flow in cross flow fan, it acts on circumference of impeller in impeller inner edge One side on the inside of.The vortex motion of impeller internal is that the vortex core can with caused by moving freely the vortex of vortex core as one To be drifted about by concrete condition.The distribution of velocity field in impeller, depending on recycle stream in the position and flow field of eccentric vortex center of vorticity Scope.Due to the presence of this interior vortex, the air for making to have been drained off flows back to impeller internal again, and this backflow causes very The loss of big energy.The efficiency of cross flow fan is dependent on this return flow ratio shared in total flow.

Nearby there is eccentric vortex in the inner circle perimeter of cross-flow fan impeller outlet side, cause through-flow to be formed, control impeller The flowing of interior zone.The position of vortex is larger to the performance impact of cross flow fan, and vortex core is close to impeller inner periphery and leans on Nearly snail tongue, fan performance are preferable；From vortex tongue farther out, then the region increase of recycle stream, fan efficiency reduce, and flow is or not vortex core Degree of stability increase.Air-flow mainly from outflow impeller in guide edge region below spiral case, forms main exhaust area, the gas velocity in the region Degree is maximum.The guide edge near zone below snail tongue, due to being influenceed by eccentric vortex, fraction again flows into impeller, is formed Exhaust gas recirculation area, the air-flow in the region is gentle, and speed is relatively low.

The cross flow fan blade of prior art is generally the structure that section molded line is camber line and straight line intersection, and surface is smooth, The easy transverse shifting of air-flow, blade inlet edge easily form larger vortex, and trailing edge fluid directly departs from surface, pressure drag compared with Greatly, above-mentioned described energy consumption to be present using the blower fan of the blade of the structure higher, it is less efficient the problem of.

Utility model content

The utility model provides a kind of cross flow fan blade, overcomes high energy consumption existing for prior art, and efficiency is low etc. asks Topic.

A kind of cross flow fan blade provided by the utility model, the blade are axially arranged by several blade units along blade Composition in a row is arranged, the blade unit is that front-end and back-end are in " V " type, and both sides are highly higher than the rib of pars intermedia height Double " V " structures of formula.

Further, the section molded line for the blade being made up of double " V " the structure blade units of the rib type is in windward side Two camber line intersects, and lee face is that first straight line, the first camber line, the second camber line, second straight line intersect successively.

Further, the distance between summit of " V " type structure of adjacent two blade unit of the blade is 15.25mm.

Further, the summit of " V " type structure of the blade unit is to the vertical range of straight line where two-end-point 1.8mm。

Further, a length of 61mm of the blade, a width of 10mm, a height of 1mm.

The beneficial effects of the utility model：

(1) shark placoid scale is copied on the surface of blade, forms the surface of similar rib structure, suppresses the lateral flow of air-flow；

(2) vane nose forms " V " shape structure, air-flow is flowed along grain direction, because the blending of turbulent flow acts on, makes attached Fluid particle in surface layer obtains more kinetic energy supplements, thus is moved behind the position of burble point, and vortex region is substantially reduced, so as to reduce Form drag；

(3) rear end of blade forms " V " shape structure, and flow direction is pointed at tip, and this " V " shape rib structure can produce Stronger turbidity current prevents fluid from separating, so as to reduce pressure drag to maintain the attachment of fluid.

(4) lowered consumption using the cross flow fan drag reduction of the blade, energy-saving and emission-reduction.

Brief description of the drawings

Fig. 1 is the structural representation of blade unit,

Fig. 2 is the top view of blade,

Fig. 3 is the front view of Fig. 2 blades,

Fig. 4 is the structural representation of impeller.

Accompanying drawing marks：

1st, blade unit, 11, front end, 12, rear end, 13, sidepiece, 14, pars intermedia, 2, blade, 21, camber line, 22, camber line, 23rd, first straight line, the 24, first camber line, the 25, second camber line, 26, second straight line, 3, impeller, 31, upper wheel disc, 32, middle wheel disc, 33rd, lower wheel disc.

Embodiment

In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining The utility model, it is impossible to be interpreted as the restriction to the specific protection domain of the utility model.

Embodiment

Reference picture 1, the cross flow fan blade of the present embodiment are axially arranged in a row group by several blade units 1 along blade Into the front end 11 and rear end 12 of the blade unit are in " V " type, and the height of both sides 13 highly forms two higher than pars intermedia 14 Rib, therefore form as double " V " structures of rib type.

Reference picture 2, the blade 2 being made up of double " V " the structure blade units 1 of rib type, its section molded line is two in windward side Bar camber line 21,22 is intersecting, and lee face is that first straight line 23, the first camber line 24, the second camber line 25, second straight line 26 intersect successively. The distance between reference picture 3, the summit a of " V " type structure of adjacent two blade unit 1 A is 15.25mm.The blade list The vertical range B of straight line is 1.8mm where the summit a to two-end-point b of " V " type structure of member 1.2 a length of 61mm of blade, it is wide For 10mm, a height of 1mm.

Reference picture 4, the impeller 3 being made up of the blade 2 includes upper wheel disc 31, middle wheel disc 32, lower wheel disc 33, and sets Blade 2 between upper wheel disc 31 and middle wheel disc 32, between lower wheel disc 33 and middle wheel disc 32.

Claims (5)

1. a kind of cross flow fan blade, the blade are axially arranged in a row along blade by several blade units and formed, it is special Sign is：The blade unit is that front-end and back-end are in " V " type, and both sides are highly double higher than the rib type of pars intermedia height " V " structure.

2. cross flow fan blade according to claim 1, it is characterised in that：By double " V " the structure blade lists of the rib type The section molded line of the blade of member composition is that two camber lines intersect in windward side, and lee face is first straight line, the first camber line, the second arc Line, second straight line intersect successively.

3. cross flow fan blade according to claim 2, it is characterised in that：" V " of adjacent two blade unit of the blade The distance between summit of type structure is 15.25mm.

4. cross flow fan blade according to claim 3, it is characterised in that：The top of " V " type structure of the blade unit The vertical range of point to straight line where two-end-point is 1.8mm.

5. cross flow fan blade according to claim 4, it is characterised in that：The a length of 61mm of blade, a width of 10mm are high For 1mm.