CN201763673U

CN201763673U - Mixed flow type fan

Info

Publication number: CN201763673U
Application number: CN201020300813XU
Authority: CN
Inventors: 李希宏
Original assignee: Tsann Kuen Zhangzhou Enterprise Co Ltd
Current assignee: Tsann Kuen Zhangzhou Enterprise Co Ltd
Priority date: 2010-01-15
Filing date: 2010-01-15
Publication date: 2011-03-16
Anticipated expiration: 2020-01-15

Abstract

The utility model discloses a mixed flow type fan, which comprises a circular fan drum, a drive motor arranged in the fan drum, an impeller, a guide vane, a guide vane drum, a back cover arranged at one side of an air inlet of the fan drum, and a front cover arranged at one side of an air outlet of the fan drum, wherein the back cover comprises at least two concentric rings of which the radiuses are sequentially degreased, wherein the concentric ring with the maximal radius is matched with the air inlet of the fan drum, and a plurality of barriers which are uniformly distributed along the radial direction are arranged between adjacent two concentric rings. The back cover of the mixed flow type fan can guide air flow by utilizing the barriers among the concentric rings, so the air pressure can be improved.

Description

A kind of mixed flow fan

Technical field

The utility model relates to a kind of blower fan, relates to a kind of mixed flow fan that combines centrifugal blower and axial-flow blower characteristics especially.

Background technique

Centrifugal blower utilizes kinetic energy to be converted to the principle of potential energy, utilizes the impeller of high speed rotating that gas is quickened, and slows down, changes the flow direction (be generally from axially to radially) then, makes kinetic energy convert potential energy (pressure) to; Axial-flow blower then provides the air-flow (flow direction that is air-flow is parallel with axle) with the impeller middle spindle equidirectional, usually be used in higher and the occasion that the pressure requirement is lower of traffic requirement, as electric fan, air-conditioning outer machine fan etc. is exactly the blower fan that the axial flow mode is moved, why be called " axial flow ", be can not change direction, but it is moving to be parallel to the blower fan axial flow because of air by blower fan.Mixed-flow (diagonal flow type) blower fan is the blower fan of a kind of boundary between axial flow and centrifugal fan, and its wind stress factor is than axial-flow blower height, and flow coefficient is bigger than centrifugal blower.A kind of mixed flow fan is disclosed among the CN101349277A, it comprises drive motor, impeller, air duct, stator tube and stator, intake grill one side of described air duct is provided with cover plate, and this cover plate covers in the part area of air duct intake grill one side periphery, to reduce the actual incoming air area of intake grill; The diameter dimension that described impeller directly still keeps and former intake grill adapts.Though said structure can reduce actual incoming air area and improve blast, but above-mentioned cover plate also defines the air intake zone of mixed flow fan artificially, causes its air intake zone too concentrated, and the air intake air-flow of too concentrating can form impact to impeller, causes reduce its working life.

The model utility content

The purpose of this utility model is to provide a kind of novel mixed flow fan, to solve the aforementioned problems in the prior.The back cover of this mixed flow fan can utilize the catch steering flow that is arranged between the concentric ring, improves blast.

The technological scheme that the utility model provides is as follows:

A kind of mixed flow fan, comprise circular air duct, be arranged on drive motor, impeller, stator, the stator tube in this air duct and be arranged on the back cover of air duct intake grill one side and be arranged on the front shroud of air duct exhaust outlet one side, it is characterized in that: described back cover comprises at least two the concentric ring that radius successively decreases successively, this wherein, the concentric ring of radius maximum is matched with the setting of air duct intake grill, and radially equally distributed several catch then are set respectively between every adjacent two concentric rings.

In the embodiment who recommends, the thickness of described catch on fore-and-aft direction is 1～5cm, and the distance between every adjacent two catch can freely be adjusted according to the diameter of air duct intake grill, generally is distributed between 0.2～5cm.

In the embodiment who recommends, described impeller comprises wheel hub and at least three the blade that is symmetrically distributed along wheel hub, the curve of this blade is the logarithm involute, its bend factor (K) is 1.12～0.68, the maximum top rake (A) of projecting blade is 6～11 degree, blade angle (B) is 10～20 degree, and blade space distortion (C) is-45～-50 degree.

In the embodiment who recommends, described hub radius accounts for 0.5～0.7 of blade radial length.

In the embodiment who recommends, the inboard of described air duct is provided with described stator tube, fix by several radially-arranged described stators between the outer circumferential face of this stator tube and the inner peripheral surface of described air duct, the central position of described stator tube front end then forms one in order to place the support of described drive motor, and the output shaft of this drive motor connects the shaft core position of described impeller backward by the through hole of stator tube rear end setting.

In the embodiment who recommends, the part stator has circular section.

In the embodiment who recommends, several arc-shaped through-holes to mutually same lateral bending song are set on the described front shroud, the starting point of described arc-shaped through-hole is positioned on this front shroud the position near outer periphery, and its end then is positioned on this front shroud the position corresponding to described drive motor outer periphery.

The front and back of mentioning in the utility model are as the criterion with the direction that air-flow flows into gentle stream outflow, are " back " with the gas stream Inbound promptly, and the air flow stream outgoing direction is " preceding ".

Compared with prior art, the utlity model has following characteristics:

1) the utility model plays the function of mandatory ventilation, ventilation and stirring to air, and it is applicable to that family, office or industrial and mining enterprise dry up or the ventilation of taking a breath, and can be used as air-conditioning companion equalization temperature, energy saving, plays environmental protection and healthy effect;

2) back cover can utilize the catch steering flow that is arranged between the concentric ring as protective housing and afflux cover, improves blast;

3) impeller has adopted between centrifugal and axial flow mixed flow working principle between the two, the established angle of impeller is 10～20 degree, it introduces air-flow with less angle, and dwindle flow spiral with the blade space distortion of-45～-50 degree and export angle of flare, in order to improve the pressure of air-flow, thereby it is little to obtain loss, and flow is big, blast is high, noise is little, the air-flow of high directivity, far jet distance, and quickens to flow out along the Normal direction of impeller blade curve tangent line;

4) adopt the motor preposition design, effectively solved the intensification problem in the machine operation process;

5) by the stator water conservancy diversion guiding of the air-flow of the high static pressure of high speed after the impeller acting, transfer static pressure to dynamic pressure through being provided with between air duct and the stator tube, make its in the shape of a spiral shape ground spiral flow out at a high speed, improved working efficiency of the present utility model significantly;

The front shroud of 6) convergence type then can make the spirality high velocity air be constringent high speed to flow out, and makes the air-flow diffusion of flowing out from front shroud little, and target is strong.

Description of drawings

Fig. 1 is the explosive view of the utility model mixed flow fan;

Fig. 2 is the perspective view of the utility model mixed flow fan;

Fig. 3 is the structural representation of the utility model fan housing, stator tube and stator;

Fig. 4 is the perspective view of impeller;

Fig. 5 is the plan view of impeller;

Fig. 6 is the lateral plan of impeller.

Embodiment

Specific embodiment of the utility model is shown in Fig. 6.

As shown in Fig. 1 to Fig. 3, a kind of mixed flow fan comprises circular air duct 2, is arranged on drive motor 1, impeller 3, stator 4, the stator tube 5 in the air duct 2 and is arranged on the back cover 6 of air duct 2 intake grills one side and be arranged on the front shroud 7 of air duct 2 exhaust outlets one side.

Back cover 6 comprises the outer shroud 61 that is matched with the setting of air duct 2 intake grills, and it is concentric with this outer shroud 61, the first interior ring 62 that radius successively decreases successively, ring 64 in the ring the 63 and the 3rd in second, encircle between 62 in the described outer shroud 61 and first, encircle between 63 in the ring 62 and second in first, and between ring the 63 and the 3rd interior ring 64 several catch 65 that radially distribute are set all in second, this wherein, ring 62 is positioned at after the outer shroud 61 in first, in second in the ring the 63 and the 3rd 64 on ring be positioned on the same plane before first ring 62, and it is concordant with the front end of outer shroud 61 to encircle 64 front end in second in the ring 63 and the 3rd.

The thickness of catch 65 on fore-and-aft direction is 1cm～5cm.

As shown in Fig. 4 to Fig. 6, impeller 3 comprises

wheel hub

31 and 5 the blade 32 that is symmetrically distributed along wheel hub 31, the curve of this blade 32 is the logarithm involute, its bend factor (K) is 1.12～0.68, the maximum top rake (A) of projecting blade is 6～11 degree, blade angle (B) is 10～20 degree, and blade space distortion (C) is-45～-50 degree.Wheel hub 31 radiuses account for 0.5～0.7 of blade 32 radial lengths.

The inboard of air duct 2 is provided with stator tube 5, fix by 6 radially-arranged stators 4 between the inner peripheral surface of the outer circumferential face of this stator tube 5 and air duct 2, the central position of stator tube 5 front ends then forms one in order to place the support 51 of drive motor 1, the through hole that the output shaft of this drive motor 1 is provided with by stator tube 5 rear ends connects the shaft core position of impeller 3 backward, with impeller 3 rotations.In 6 stators 4, the cross section of 2 stators is circular arc.

Several arc-shaped through-holes 71 to mutually same lateral bending song are set on the front shroud 7, the starting point of arc-shaped through-hole 71 is positioned at the position of close outer periphery on this front shroud 7, its end then is positioned on this front shroud 7 corresponding to the position of drive motor 1 outer periphery, and air-flow can be flowed out from arc-shaped through-hole 71 constringent high speeds.

At the radial length of blade 32 is 10 constantly, and the flow of mixed flow fan is 1550～1800 cubic meters/hours, and blast is 160～220Pa, outlet wind speed: 7～8 meter per seconds.

Above-mentioned only is a specific embodiment of the present utility model, but design concept of the present utility model is not limited thereto, and allly utilizes this design that the utility model is carried out the change of unsubstantiality, all should belong to the behavior of invading the utility model protection domain.

Claims

1. mixed flow fan, comprise circular air duct, be arranged on drive motor, impeller, stator, the stator tube in this air duct and be arranged on the back cover of air duct intake grill one side and be arranged on the front shroud of air duct exhaust outlet one side, it is characterized in that: described back cover comprises at least two the concentric ring that radius successively decreases successively, this wherein, the concentric ring of radius maximum is matched with the setting of air duct intake grill, and radially equally distributed several catch then are set respectively between every adjacent two concentric rings.

2. according to a kind of mixed flow fan described in the claim 1, it is characterized in that: the thickness of described catch on fore-and-aft direction is 1～5cm, and the distance between every adjacent two catch is 0.2～5cm.

3. according to a kind of mixed flow fan described in claim 1 or 2, it is characterized in that: described impeller comprises wheel hub and at least three the blade that is symmetrically distributed along wheel hub, the curve of this blade is the logarithm involute, its bend factor is 1.12～0.68, the maximum top rake of projecting blade is 6～11 degree, blade angle is 10～20 degree, and the blade space distortion is-45～-50 degree.

4. according to a kind of mixed flow fan described in the claim 3, it is characterized in that: described hub radius accounts for 0.5～0.7 of blade radial length.

5. according to a kind of mixed flow fan described in the claim 4, it is characterized in that: the inboard of described air duct is provided with described stator tube, fix by several radially-arranged described stators between the outer circumferential face of this stator tube and the inner peripheral surface of described air duct, the central position of described stator tube front end then forms one in order to place the support of described drive motor, and the output shaft of this drive motor connects the shaft core position of described impeller backward by the through hole of stator tube rear end setting.

6. according to a kind of mixed flow fan described in the claim 5, it is characterized in that: the part stator has circular section.

7. according to a kind of mixed flow fan described in the claim 6, it is characterized in that: several arc-shaped through-holes to mutually same lateral bending song are set on the described front shroud, the starting point of described arc-shaped through-hole is positioned on this front shroud the position near outer periphery, and its end then is positioned on this front shroud the position corresponding to described drive motor outer periphery.