CN205876751U - Centrifugal forced draught blower and have air conditioner of this centrifugal forced draught blower - Google Patents

Abstract

Centrifugal forced draught blower and have air conditioner of this centrifugal forced draught blower. Arrange on the impeller each before have to blade (6): front surface (61), the back (62), the 1st convex surface (63), it is located and leans on the inboard position of direction of radius than the front surface and the back to to the inboard protrusion of direction of radius, the 2nd convex surface (64), it is located between front surface and the 1st convex surface, is connected with the 1st convex surface to to direction of rotation (F) protrusion, and the concave bent face (65) of connecting, the 2nd convex surface and front surface are connected to it, and the 1st convex surface and the 2nd convex surface form the convex curved surface who connects smoothly. Be formed with smooth face (66) to the blade at the direction of radius at back inside portion branch before each, the 1st convex surface and smooth face are by connect to tossing about mutually of direction of rotation convex the 3rd convex surface (67) smoothly, and the direction of radius outside part at the smooth face and the back is by connecting smoothly to tossing about mutually of direction of rotation convex the 4th convex surface (68).

Description

Centrifugal blower and there is the air conditioner of this centrifugal blower

Technical field

This utility model relates to the centrifugal blowers such as Sirocco fan and has the air conditioner of this centrifugal blower.

Background technology

In the past, the centrifugal blower such as Sirocco fan for example, be widely used for the air cleaner of the example as air conditioner Machine.In the field of the air conditioners such as such air cleaning machine, performance i.e. noise and efficiency become universal problem, thus for sky The Sirocco fan used in tune machine, noise and fan efficiency also become universal problem.

In the past, in the blade of Sirocco fan, the gap flowed between adjacent Forword vane (is sometimes referred to as between blade Stream) in air flow into the front face side of leading edge of Forword vane, near leading edge, be divided into front face side and rear side.Enter And, in the way of walking around leading edge portion, flowing to rear side towards the air of rear side, but the shape at the back side can not be followed, air-flow exists The stripping area at the back side increases, the flowing instability of air.Accordingly, there exist and make that the blowout rheology of pressure fan is dynamic, air-supply sound increases Greatly, the problem that fan efficiency declines.

Therefore, in order to solve this problem, it is proposed that the Sirocco fan that No. 5589989 publications of Japanese Patent No. are recorded. This Sirocco fan has the impeller being circumferentially arranged with Forword vane, as it is shown in figure 9, Forword vane 101 has is positioned at rotation The front surface (pressure surface) 102 of direction F1 and form the 1st convex surface comprising leading edge 103 of convex surface inside radial direction 104.Further, this Forword vane 101 arranges to the 2nd of direction of rotation F1 protrusion the convex between front surface the 102 and the 1st convex surface 104 Face 105, and the 1st convex surface the 104 and the 2nd convex surface 105 comprising leading edge 103 is connected by the curved surface smoothed, thus make towards the back side The inflow of 106 also becomes smooth and easy, thus reduces the stripping 107 of overleaf 106.

But, in such an embodiment, as shown in Figure 10, it is at front surface the 102 and the 1st convex surface when observing as leaf grating The 2nd convex surface 105 protruded to direction of rotation F1 is set between 104.Thus, have between the narrowest and small blade near leading edge 103 Between the blade of the position of flow path width, flow path width W1 narrows, thus produces and stop the gap entering adjacent Forword vane 101 In air flowing effect, exist fan efficiency decline problem.

Utility model content

This utility model proposes the most in light of this situation, its object is to, it is provided that improve fan efficiency from Core type pressure fan.

Centrifugal blower according to an aspect of the present utility model has and is circumferentially arranged with multiple Forword vane Impeller, described impeller rotates centered by axis of rotation, and each Forword vane has: front surface, and it is positioned at direction of rotation；The back of the body Face, it is positioned at the rightabout of direction of rotation；1st convex surface, it includes the leading edge of the end inside as radial direction, is positioned at ratio Described front surface and the described back side are by the position inside radial direction, and protrude inside radial direction；2nd convex surface, it is positioned at Between described front surface and described 1st convex surface, it is connected with described 1st convex surface, and protrudes to direction of rotation；And concave curved connects Face, its described 2nd convex surface of connection and described front surface, and cave in a rotational direction, described 1st convex surface and the 2nd convex surface are formed The convex surface smoothly connected, and, each Forword vane is formed with tabular surface in the radial direction inboard portion at the described back side Portion, described 1st convex surface and described smooth face are smoothly connected by the 3rd convex surface protruded to the opposition side of direction of rotation, described The radial direction Outboard Sections at the smooth facial and described back side is smoothly connected by the 4th convex surface protruded to the opposition side of direction of rotation Connect.

Wherein, " smooth face " refers to plane or the big curved surface of radius of curvature.Further, " curved surface that radius of curvature is bigger " Refer to cutting off in the cross section obtained along the face vertical with the axis of rotation of impeller by Forword vane, by the table forming Forword vane The curved surface that radius of curvature maximum in the multiple circular arc of face shape is formed.

According to an aspect of the present utility model, each Forword vane and conventional Forword vane equally at front surface and The 2nd convex surface protruded to direction of rotation is set between the 1st convex surface, and is connected the 1st convex surface comprising leading edge by the curved surface smoothed With the 2nd convex surface, thus make that the inflow at forward face and the back side is smooth and easy to be carried out.Further, the 1st convex surface of each Forword vane and smooth Face is smoothly connected by the 3rd convex surface protruded to the opposition side of direction of rotation, outside the radial direction at smooth face and the back side Part is smoothly connected by the 4th convex surface protruded to the opposition side of direction of rotation, it is thus possible to reduce the stripping of the air stream at the back side From region.It addition, the radial direction inboard portion that each Forword vane is overleaf forms smooth face, thus have near leading edge Flow path width W between the blade of the position of flow path width is had between the narrowest and small blade to broaden.Therefore, the sky between Forword vane is flowed into Flow of air is smooth and easy to be carried out, and the loss caused because of obstruction reduces, and fan efficiency improves.

Preferably, each Forword vane is cutting off in the cross section obtained along the face vertical with described axis of rotation, is setting The central point of the circular arc forming described 4th convex surface is Rm with described axis of rotation distance in the radial direction, sets described forward direction The radius of the cascade axis of the front edge side of blade is R1, set the radius of cascade axis of the trailing edge side of described Forword vane as R2 Time, there is the relation of Rm≤R1+ (R2-R1)/3, be located at described 4th convex surface relative with what the abutment of described smooth face was passed through Tangent line in described 4th convex surface is the 1st tangent line, and the intersection point of the cascade axis and described 1st tangent line that are located at described front edge side passes through The tangent line of the cascade axis relative to described front edge side be the 2nd tangent line, if described 1st tangent line and described 2nd tangent line are rotating When the angle of cut of center axis is β m, described angle of cut β m has 30 °～the angle of 70 °.

According to such structure, it is possible to the radial direction Outboard Sections at the back side of Forword vane is being set to conventional shape State under, make to have between the narrowest and small blade between the blade of the position of flow path width flow path width W more than conventional width.And And, it is possible to from the 2nd convex surface via the 1st convex surface until the back side forms smooth convex surface, it is thus possible to reduce the sky of rear side The stripping area of air-flow, it is possible to reduce the noise of centrifugal blower.

Preferably, each Forword vane the thick center of the maximum wing that sets on camber line and axis of rotation distance as During Rt, there is the relation of R1≤Rt≤R1+ (R2-R1)/3.

According to such structure, thicken the back side is peeling the wing thickness near the position of stream, it is thus possible to make forward direction The shape of the radial direction Outboard Sections in the back side of blade as usual, reduces the region peeling off stream.

Another aspect of the present utility model provides air conditioner, and this air conditioner has above-mentioned centrifugal in terms of any one Pressure fan is as indoor air circulation fan.

This air conditioner above-mentioned centrifugal blower of use is as indoor air circulation fan, thus fan noise reduces, And then the noise of air conditioner reduces.

According to the centrifugal blower of above-mentioned several aspects of the present utility model, the stripping area in the back side reduces, and Flowing into the loss reduction that the air stream between Forword vane causes because of Intercepting effects, fan efficiency improves.

Accompanying drawing explanation

Fig. 1 is the front view of the centrifugal blower representing embodiment of the present utility model.

Fig. 2 is the sectional view of the centrifugal blower of the II-II line along Fig. 1.

Fig. 3 is the front view of the impeller of the centrifugal blower in Fig. 1.

Fig. 4 is the front view of the Forword vane that the leaf grating of the impeller in Fig. 3 is comprised.

Fig. 5 is the schematic diagram of flow path width between the blade in the leaf grating of the impeller of explanatory diagram 1.

Fig. 6 is the schematic diagram for analysis result that the air of Forword vane flows is described.

Fig. 7 is the curve chart of the noise properties representing centrifugal blower.

Fig. 8 is the curve chart of the Static compression performance representing centrifugal blower.

Fig. 9 is the signal of the analysis result of the air flowing of the Forword vane for conventional centrifugal blower is described Figure.

Figure 10 is the leaf grating part figure for flow path width between the blade in the leaf grating of conventional centrifugal blower is described.

Label declaration

A axis of rotation；L1 (front edge side) cascade axis；L2 (trailing edge side) cascade axis；L3 the 1st tangent line；L4 the 2nd cuts Line；L5 camber line；P1 leading edge；P2 trailing edge；Pm (forming the circular arc of the 4th convex surface) central point；Pt (maximum wing thickness) center； R1 (cascade axis of front edge side) radius of curvature；R2 (cascade axis of trailing edge side) radius of curvature；Rt (center Pt with Axis of rotation is in the radial direction) distance；Rm (center point P m with axis of rotation in the radial direction) distance；The Tm maximum wing Thick；β m (the 1st tangent line and the 2nd tangent line) angle of cut；1 centrifugal blower；3 impellers；6 Forword vanes；61 front surfaces (pressure surface)； 62 back sides (suction surface)；63 the 1st convex surfaces；64 the 2nd convex surfaces；65 concave curved joint faces；66 smooth faces；67 the 3rd convex surfaces；68 the 4th is convex Face.

Detailed description of the invention

First, the centrifugal blower of embodiment is described below.It addition, this utility model is not limited to showing of following description Example, and illustrate in detail in the claims, it is understood that comprise all changes in the meaning impartial with claims and scope More.

The centrifugal blower 1 of present embodiment is the multiblade fan (Sirocco fan) of single induction type.Further, this enforcement The air conditioner of mode has centrifugal blower 1 as indoor air circulation fan.As shown in Figures 1 and 2, present embodiment Centrifugal blower 1 shell 2, the impeller 3 being accommodated in shell 2 and the motor 4 making impeller 3 rotate with Scrawl. It addition, the centrifugal blower 1 of the air conditioner use embodiment of present embodiment is as indoor air circulation fan, except this There is the structure in addition identical with conventional air conditioner, thus omit diagram and the detailed description of air conditioner.

Shell 2 includes: a pair front plate 21 and 22, and they are arranged opposite in the axial direction of the axis of rotation A of impeller 3；Side Panel 23, its arranged circumferentially between front plate 21 and backplate 22 along impeller 3.The sky of circle it is formed with in front plate 21 Aspiration entrance 24.It is formed with Air blowing mouth 25 in the end of the circumference of the shell 2 of scroll.Motor 4 with its axle 41 towards rotation The axial mode of rotating shaft heart A is installed on backplate 22.

As shown in Figures 2 and 3, impeller 3 has: mainboard 31, and it is fixed on axle 41；Multiple Forword vanes 6, it is along mainboard The circumferential array of 31, and it is fixed on mainboard 31；Reinforcing ring 32, it is connected with the end of the face side of Forword vane 6.

The impeller 3 of centrifugal blower 1 is along with the rotation of the axle 41 of motor 4, with axis of rotation A for axis of rotation to rotation The direction of direction F rotates, and is drawn in shell 2 from air suction inlet 24 by air.The air being inhaled into is at the forward direction leaf of impeller 3 Sheet 6 passes through in gap to each other, flows out outside radial direction from impeller 3, logical in the stream of the scroll in shell 2 Cross, blow out from Air blowing mouth 25.

As shown in Figure 4, the blade exit of each Forword vane 6 of centrifugal blower 1 tilts to direction of rotation F.Each The rightabout back side that Forword vane 6 has the front surface (pressure surface) 61 being positioned at direction of rotation F, be positioned at direction of rotation F is (negative Pressure surface) the 62, the 1st convex surface the 63, the 2nd convex surface 64, concave curved joint face 65.Further, if the leaf grating of the leading edge P1 side of each Forword vane 6 The distance i.e. radius of curvature of axis L1 and axis of rotation A is R1, if the cascade axis L2 of the trailing edge P2 side of Forword vane 6 and rotation The distance of axle center A i.e. radius of curvature is R2.

Front surface 61 is the concave curved surface caved in the rightabout of direction of rotation F, and the back side 62 is contrary to direction of rotation F The convex surface that direction is protruded.1st convex surface 63 comprises leading edge P1 of the end inside as radial direction, be positioned at than front surface 61 and The back side 62 is by the position inside radial direction, and forms the convex surface protruded inside radial direction.

It is formed with the 2nd convex surface 64 and concave curved joint face 65 between the 1st convex surface 63 and front surface 61.2nd convex surface 64 is one The convex surface that Fang Yu 1 convex surface 63 connects, the opposing party is connected with concave curved joint face 65 and protrudes to direction of rotation F.Concave curved connects Face 65 is to connect the 2nd convex surface 64 and front surface 61 concave curved surface to direction of rotation F depression.So, front surface 61, concave curved connect Face the 65, the 2nd convex surface the 64, the 1st convex surface 63 sequentially arranges from front-surface side, forms the curved surface smoothly connected.

As it has been described above, concave curved joint face 65 connects the front surface 61 as concave curved surface and the 2nd convex surface 64 as convex surface, Thus in the concave curved surface formed by front surface 61 and concave curved joint face 65, the change pars convoluta P3 of radius of curvature minimum is present in concave curved On joint face 65.Further, concave curved joint face the 65 and the 2nd convex surface 64 connects at the change pars convoluta P4 of the boundary member as them. It is concave curved surface than becoming pars convoluta P4 by concave curved joint face 65 side, is convex surface than becoming pars convoluta P4 by the 2nd convex surface 64 side.

Radius of curvature r1 of leading edge P1 of the 1st convex surface 63 curvature more than the ora terminalis P5 of direction of rotation F of the 2nd convex surface 64 half Footpath r5.

Further, when setting the radius of curvature becoming pars convoluta P3 into r3, preferably these radius of curvature are formed as described pass System.

0.1·(R2-R1)≤r1≤0.4·(R2-R1)

0.05·(R2-R1)≤r3≤0.15·(R2-R1)

0.03·(R2-R1)≤r5≤0.1·(R2-R1)

r5<r3<r1

On the other hand, the radial direction Outboard Sections of 62 is formed with plane smooth facial 66 overleaf.Further, the 1st Convex surface 63 and smooth facial 66 is smoothly connected by the 3rd convex surface 67 protruded to the opposition side of direction of rotation F, smooth facial 66 Hes The radial direction Outboard Sections at the back side 62 is smoothly connected by the 4th convex surface 68 protruded to the opposition side of direction of rotation F.Further, The radius of curvature of the 3rd convex surface 67 and the radius of curvature of the 4th convex surface 68 are formed as less than the radius of curvature of leading edge P1 of the 1st convex surface 63 R1, radius of curvature r5 of ora terminalis P5 more than the 2nd convex surface 64.

Further, each Forword vane 6 is formed as cutting off along the cross section obtained on edge with described face vertical for axis of rotation A, When setting center point P m of circular arc of formation the 3rd convex surface 67 and axis of rotation A distance in the radial direction as Rm, there is Rm ≈ The relation of R1+ (R2-R1)/3.

Further, when setting the 1st tangent line L3 and the 2nd tangent line L4 angle of cut in axis of rotation A side as β m, described angle of cut β m is formed For having the angle of about 60 °.Wherein, the 1st tangent line L3 be the 4th convex surface 68 and the smooth abutment of facial 66 pass through relative to The tangent line of the 4th convex surface 68, the 2nd tangent line L4 be the intersection point of the 1st tangent line L3 and the cascade axis L1 of front edge side pass through relative to The tangent line of the cascade axis L1 of front edge side.

Each Forword vane 6 forms such structure, and centered by setting maximum wing thickness Tm position on camber line L5 Position Pt, when setting the distance of center Pt and axis of rotation A as Rt, Rt is than center point P m of the circular arc forming the 3rd convex surface 67 Smaller with axis of rotation A distance Rm in the radial direction, but be formed as essentially identical size.That is, Rm ≈ R1+ (R2-R1)/ 3.Further, the wing thickness of Forword vane 6 is formed as, along with the center Pt from maximum wing thickness Tm is towards leading edge P1 and trailing edge P2 Reduce.

Below, the effect of the centrifugal blower 1 of present embodiment is described.

The centrifugal blower 1 of present embodiment when impeller 3 rotates with axis of rotation A as center of rotation, air from Air suction inlet 24 is inhaled into.The air sucked from air suction inlet 24 passes through to each other at Forword vane 6, from impeller 3 to half Flow out outside direction, footpath, blow out from Air blowing mouth 25.Now, as it is shown in figure 5, the radius side at the back side 62 at Forword vane 6 It is formed in part with smooth facial 66 laterally, thus there is near leading edge P1 the position of flow path width between the narrowest and small blade Between blade, flow path width W is more than conventional width.Therefore, flow into that the flowing of the air between Forword vane 6 is smooth and easy to be carried out, because of conventional Intercepting effects and the loss that causes reduces, fan efficiency improves.

Further, as shown in Figure 6, the air stream flow through to each other at Forword vane 6 is divided into the flow direction by the 2nd convex surface 64 The air stream of front surface 61 side and along the 1st convex surface 63 towards the air stream of side, the back side 62.

Front surface 61 is smoothly flowed therein along concave curved joint face 65 towards the air stream of front surface 61 side.Thus, suppression exists The variation of the air that front surface 61 effluent is crossed.

Towards the air stream of side, the back side 62 by the 2nd convex surface the 64, the 1st convex surface the 63, the 3rd convex surface 67 is sequentially connected formation Smooth and continuous print convex surface, be directed to rear side swimmingly.Further, overleaf the radial direction inboard portion of side by 3 convex surfaces 67, smooth facial 66 and the 4th convex surface 68 form smooth convex surface, thus the air stream being directed into rear side is suitable Freely it is directed to the radial direction Outboard Sections of rear side.Thus, the stripping making air-flow is located proximate to outside the radial direction at the back side Side part moves, and makes stripping S postpone.

Further, in the present embodiment, more particularly, Forword vane 6 is formed as setting the circular arc constituting the 3rd convex surface 67 Center point P m and axis of rotation A distance in the radial direction when being Rm, there is the relation of Rm ≈ R1+ (R2-R1)/3, and The angle of cut β m of the 1st tangent line L3 and the 2nd tangent line L4 is formed as β m ≈ 60 °.Therefore, the radial direction Outboard Sections of Forword vane 6 is made Keep conventional shape, and make flow path width W between the narrowest and small blade be more than conventional width.

Further, in the present embodiment, set maximum wing thickness Tm of Forword vane 6 center on camber line L5 as Pt, when setting the axis of rotation A of center Pt and impeller 3 distance in the radial direction as Rt, Rt ≈ R1+ (R2-R1)/3.Cause This, be set to the position being easily peeling maximum wing thickness Tm, make to be difficult to be peeling at this position.

The centrifugal blower 1 of present embodiment is constituted as described above, it is thus possible to play as described below Effect.

(1) each Forword vane 6 arranges the 2nd convex surface protruded to direction of rotation F between front surface the 61 and the 1st convex surface 63 64, and from the 2nd convex surface 64 until concave curved joint face 65, front surface 61 are formed as smooth curved surface, it is thus possible to make air Stream flows to front surface 61 from the 2nd convex surface 64 swimmingly along concave curved joint face 65, it is possible to the variation of suppression air.

(2) each Forword vane 6 from the 2nd convex surface 64 until the 1st convex surface the 63, the 3rd convex surface 67, smooth facial 66, the 4th convex Face 68, the radial direction Outboard Sections at the back side 62 are formed as smooth convex surface, it is thus possible to suitable from the 2nd convex surface 64 rearwardly side Freely direct air flow to the back side 62.As a result of which it is, the generation position of stripping can be made to postpone, it is possible to reduce and peel off.

(3) each Forword vane 6 overleaf 62 radial direction inboard portion be formed with smooth facial 66, it is thus possible to subtract The protrusion of little 2nd convex surface 64 side overleaf.As a result of which it is, stream width between the narrowest and small blade can be made to have near leading edge P1 Between the blade of the position of degree, flow path width W is more than conventional width.Therefore, it is possible to alleviate corresponding with flow path width W between blade The Intercepting effects of position, it is possible to reduce the loss caused because of Intercepting effects, improves fan efficiency.

(4) about the circular arc that forms the 4th convex surface 68 center point P m and impeller 3 axis of rotation A in the radial direction The cascade axis of the trailing edge side of distance Rm, the radius of curvature R 1 of cascade axis L1 of front edge side of Forword vane 6 and Forword vane 6 The radius of curvature R 2 of line L2, is formed as Rm ≈ R1+ (R2-R1)/3.Further, if the 1st tangent line L3 and the 2nd tangent line L4 is at axis of rotation The angle of cut β m of A side is about 60 °, it is thus possible to the radial direction Outboard Sections at the back side 62 of Forword vane 6 is being formed as conventional Shape state under, make to have near leading edge P1 between the narrowest and small blade flow path width between the blade of the position of flow path width W is more than conventional width.Further, from the 1st convex surface 63 until the back side 62 is formed as smooth convex surface, it is thus possible to reduce stripping From.

(5) distance Rt of the center Pt and axis of rotation A of the Forword vane 6 maximum wing thickness Tm on camber line L5 is Rt ≈R1+(R2-R1)/3.Thicken therefore, it is possible to 62 sides overleaf to be peeling the wing thickness near the position of stream.Therefore, it is possible to Make the shape of radial direction Outboard Sections of Forword vane 6 as usual, and reduce the region peeling off stream.

(6) centrifugal blower 1 of present embodiment shows noise properties as shown in Figure 7.According to this characteristic line chart Understand, compared with conventional centrifugal blower, in the case of the pressure fan being used as the identical air quantity of performance, it is known that lower noise About 1dB [A].Further, the centrifugal blower 1 of present embodiment shows Static compression performance as shown in Figure 8.Do not have in the figure Record rotating speed, thus can not compare with conventional centrifugal blower, but the centrifugal air-supply of actually present embodiment Machine 1 is compared with conventional centrifugal blower, it is possible to obtain identical air quantity with relatively low rotating speed.Therefore, it is known that this embodiment party The centrifugal blower 1 of formula is compared with conventional centrifugal blower, it is possible to obtain identical air quantity and phase with relatively low rotating speed Same static pressure.As a result of which it is, the centrifugal blower 1 of present embodiment is compared with conventional centrifugal blower, it is possible to reduce Rotating speed, thus correspondingly can improve fan efficiency.

(7) air cleaning machine of present embodiment uses the centrifugal blower 1 of present embodiment to follow as room air Ring fan, thus the noise of air cleaning machine reduces, and running efficiency improves.

(variation)

Relevant description of the present embodiment is centrifugal blower of the present utility model and uses this centrifugal blower The example of the mode that air cleaning machine can be taked, it is impossible to be interpreted as limiting which.Centrifugal blower of the present utility model And use the air conditioner of this centrifugal blower can take the variation of above-mentioned embodiment the most described below, Yi Jixiang The compound mode of mutual reconcilable at least two variation.

In the foregoing embodiment, smooth facial 66 are formed by plane, but are not limited to this, it is also possible to be set to close to plane The bigger curved surface of radius of curvature.More particularly, it is also possible to be, vertical with the axis of rotation A of impeller 3 on edge face is by forward direction Blade 6 cuts off in the cross section obtained, radius of curvature maximum in the multiple circular arc of the surface configuration forming Forword vane 6 formed The curved surface of degree.

In the foregoing embodiment, about the axis of rotation of center point P m and impeller 3 of the circular arc forming the 4th convex surface 68 A is at distance Rm of radial direction, the radius of curvature R 1 of the cascade axis L1 of the leading edge P1 side of Forword vane 6 and Forword vane 6 The radius of curvature R 2 of the cascade axis L2 of trailing edge P2 side, is formed as Rm ≈ R1+ (R2-R1)/3.But, about their relation, As long as Rm≤R1+ (R2-R1)/3, it becomes possible to the radial direction Outboard Sections at the back side 62 of Forword vane 6 is formed as with Toward shape state under, make flow path width W between blade the narrowest and small near leading edge P1 more than conventional width.

In the foregoing embodiment, if the 1st tangent line L3 and the 2nd tangent line L4 angle of cut β m in axis of rotation A side is about 60°.But, about angle of cut β m, as long as 30 °～the scope of 70 °, it becomes possible at the radial direction by the back side of Forword vane 6 Under the state that Outboard Sections is formed as conventional shape, make to have the position of flow path width between the narrowest and small blade near leading edge P1 Between the blade put, flow path width W is more than conventional width.It addition, when angle of cut β m is less than 30 °, the 1st convex surface 63 is difficult to be formed puts down Sliding convex surface, air stream can not be directed to rear side swimmingly, and stripping area expands.Further, it it is more than 70 ° at angle of cut β m Time, the rear side of the 2nd convex surface 64 becomes the shape that rear side is protruded as conventional Forword vane, thus cannot increase the narrowest Flow path width W between little blade.

In the foregoing embodiment, about maximum wing thickness Tm of the Forword vane 6 center Pt on camber line L5, If the axis of rotation A of center Pt and impeller 3 is when the distance of radial direction is Rt, Rt ≈ R1+ (R2-R1)/3.But, close In this relation, as long as being set as the relation of R1≤Rt≤R1+ (R2-R1)/3, it becomes possible to 62 sides overleaf are peeling stream Wing thickness near position thickeies, it is thus possible to makes the shape of radial direction Outboard Sections of Forword vane 6 as usual, and subtracts The little region peeling off stream.

In the foregoing embodiment, illustrate air cleaning machine about the air conditioner using aforementioned centrifugal blower 1, It may also be other air conditioner.For example, it is also possible to be general cooling and warming air-conditioning, it is also possible to be such as air interchanger etc. Air conditioner in broader sense like that.Further, air conditioner both can be home-use, it is also possible to commercial.

Claims (5)

1. a centrifugal blower (1), it has the impeller (3) being circumferentially arranged with multiple Forword vane (6), described impeller (3) rotate centered by axis of rotation (A), it is characterised in that

Each Forword vane (6) has:

Front surface (61), it is positioned at direction of rotation (F)；

The back side (62), it is positioned at the rightabout of direction of rotation (F)；

1st convex surface (63), it includes the leading edge (P1) of the end inside as radial direction, be positioned at than described front surface (61) and The described back side (62) is by the position inside radial direction, and protrudes inside radial direction；

2nd convex surface (64), it is positioned between described front surface (61) and described 1st convex surface (63), with described 1st convex surface (63) even Connect, and protrude to direction of rotation (F)；And

Concave curved joint face (65), its described 2nd convex surface (64) of connection and described front surface (61), and cave in a rotational direction,

Described 1st convex surface (63) and the 2nd convex surface (64) form the convex surface smoothly connected,

Further, each Forword vane (6) is formed with smooth face (66) in the radial direction inboard portion of the described back side (62),

Described 1st convex surface (63) and described smooth face (66) are by the 3rd convex surface (67) protruded to the opposition side of direction of rotation (F) Smoothly connect,

The radial direction Outboard Sections of described smooth face (66) and the described back side (62) is by convex to the opposition side of direction of rotation (F) The 4th convex surface (68) gone out smoothly connects.

Centrifugal blower the most according to claim 1, it is characterised in that

Each Forword vane (6) is cutting off in the cross section obtained along the face vertical with described axis of rotation (A), described setting formation The central point (Pm) of the circular arc of the 4th convex surface (68) and described axis of rotation (A) distance in the radial direction be Rm, set described before Radius to the cascade axis (L4) of leading edge (P1) side of blade (6) is R1, set trailing edge (P2) side of described Forword vane (6) When the radius of cascade axis (L2) is R2,

There is the relation of Rm≤R1+ (R2-R1)/3,

Be located at that the abutment of described 4th convex surface (68) and described smooth face (66) passes through relative to described 4th convex surface (68) Tangent line be the 1st tangent line (L3), the intersection point of the cascade axis (L1) and described 1st tangent line (L3) that are located at described front edge side passes through It is the 2nd tangent line (L4) relative to the tangent line of the cascade axis (L1) of described front edge side, if described 1st tangent line (L3) and the described 2nd Tangent line (L4) is when the angle of cut of axis of rotation (A) side is β m, and described angle of cut β m has 30 °～the angle of 70 °.

Centrifugal blower the most according to claim 1, it is characterised in that

Each Forword vane (6) centered by the position of the maximum wing that sets on camber line (L5) thick (Tm) position (Pt), set centre bit Put the distance of (Pt) and axis of rotation when being Rt,

There is the relation of R1≤Rt≤R1+ (R2-R1)/3.

Centrifugal blower the most according to claim 2, it is characterised in that

Each Forword vane (6) centered by the position of the maximum wing that sets on camber line (L5) thick (Tm) position (Pt), set centre bit Put the distance of (Pt) and axis of rotation when being Rt,

There is the relation of R1≤Rt≤R1+ (R2-R1)/3.

5. an air conditioner, it is characterised in that what this air conditioner had in Claims 1 to 4 described in any one centrifugal send Blower fan is as indoor air circulation fan.