CN206054382U - A kind of spiral case and application have the centrifugal blower of the spiral case - Google Patents

Abstract

The utility model discloses a kind of spiral case, including ring wall and the cover plate positioned at ring wall side, it is characterised in that：Be provided with the stator that the molded line along the cover plate is spaced apart on the inside of the cover plate, the stator from the cover plate to spiral case inside extend and there is certain width.Also disclosing a kind of application has the centrifugal blower of the spiral case.By arranging stator in the outlet of the front shroud of spiral case, i.e. impeller, and along spiral case inlet pressure directional spreding, not only can improve because airflow direction changes the flow separation brought, the organizational structure of optimization spiral case and impeller protecgulum gap area air-flow, the leakage of the air-flow brought because of the gap between sound part can also be reduced, so as to improve the pressure of blower fan system；Mobility status of the air-flow inside spiral case can also be improved, flowing of the air-flow in spiral case is made more smoothly, reduced flow losses.

Description

A kind of spiral case and application have the centrifugal blower of the spiral case

Technical field

This utility model is related to a kind of centrifugal blower, especially a kind of spiral case of centrifugal blower, and application has the spiral case Centrifugal blower.

Background technology

The operation principle of centrifugal blower is that the dynamic wheel rotation of motor belt motor is done work to air-flow, and by the diffusion action of spiral case from Radially discharge.

As airflow direction is axial into the direction of centrifugal blower, the direction of discharge is radial direction, so that bringing about the desired sensation Stream direction experienced 90 ° of turning, therefore spiral case occurs flow separation near impeller protecgulum wall, produce whirlpool；While in order to Sound part recurring structure is avoided to interfere, spiral case is larger with impeller protecgulum gap so that internal leakage loss is very big；Simultaneously because snail The molded line of shell is designed according to impeller outlet Velocity Profiles, but blower fan work is in improper working condition, spiral case Molded line no longer match with the air velocity of impeller outlet, so as to be susceptible to flow separation along the direction of spiral case, produce Loss.

The existing flow regime that blower fan is entered to improve air-flow, reduces gas flow loss and flow noise, generally Realized by arranging air deflector in the entrance of impeller.One as disclosed in the Chinese patent of Application No. 201120539833.7 Kind of the multiple wing type centrifugal blower fan with Multifunctional flow-guiding device, guiding device include air deflector, and air deflector is cylindrical or circular cone Shape, is evenly equipped with multiple guide vanes or reads a flow deflector, the outlet section direction and impeller of guide vane or flow deflector on its circumference It is radially consistent.This air deflector, is arranged on the leading portion of impeller, when air quantity is larger with design air flow deviation, easily causes to enter The air-flow of impeller is axially distributed uneven.

Utility model content

First technical problem to be solved in the utility model is the problem existed for above-mentioned prior art, there is provided one Planting improves the spiral case of air current flow.

Second technical problem to be solved in the utility model is the problem existed for above-mentioned prior art, there is provided one Planting application has the centrifugal blower of above-mentioned spiral case.

This utility model solve technical scheme that above-mentioned first technical problem adopted for：A kind of spiral case, including ring wall With the cover plate positioned at ring wall side, it is characterised in that：The molded line interval point along the cover plate is provided with the inside of the cover plate The stator of cloth, the stator from the cover plate to spiral case inside extend and there is certain width.

In order to preferably improve air current flow, the angle between the stator chord length direction and the molded line tangent line of cover plate is formed The inclined angle of stator opposing cover plates, the angle ranging from 10 °～50 °.

Further to improve efficiency, so that stator are adjusted to suitable angle according to air quantity, the spiral case is also wrapped Include for adjusting the governor motion of the inclined angle of stator, the governor motion includes drive mechanism, is connected to the driving machine Drive mechanism between structure and stator.

Governor motion is preferred, and the drive mechanism is to be arranged on the motor on the outside of the cover plate, the drive mechanism bag The first gear being connected with the output shaft of the drive mechanism and the second gear engaged with the first gear are included, it is described Second gear is arranged on the stator towards the one end on the outside of cover plate.

Angle between two adjacent stators is δ, and 25 °≤δ≤30 °, if angle is too small, stator can be sent out when moving Raw to interfere, if angle is excessive, the effect for improving leakage and flowing can weaken, while also can mismatch with impeller

To conform better to aerodynamic so that the amplitude for improving flowing is larger, the stator cross sectional shape is aerofoil profile.

To improve certain inhomogeneities that air-flow is presented in the axial direction of impeller so that flowing change is more uniform, The stator is ternary blade.

Due to the flow leakage phenomenon between front shroud and impeller it is more serious, it is therefore preferred that the cover plate includes setting Put in the front shroud on front side of ring wall and the back shroud being arranged on rear side of ring wall, the stator is arranged on the interior of the front shroud Side.

This utility model solve technical scheme that above-mentioned second technical problem adopted for：A kind of application has as mentioned above Spiral case centrifugal blower, be provided with impeller in the spiral case, it is characterised in that：The width of the stator is high for the blade of impeller The 1/3～1/4 of degree.

To reduce the noise of centrifugal blower, the gap between the stator and impeller periphery and the ratio between the diameter of impeller Value is more than 0.05.

Compared with prior art, the utility model has the advantage of：By the cover plate in spiral case especially front shroud, i.e. leaf Stator is set in the outlet of wheel, and along spiral case inlet pressure directional spreding, not only can be improved because airflow direction change brings Flow separation, optimize the organizational structure of spiral case and impeller protecgulum gap area air-flow, can also reduce because sound part it Between the leakage of air-flow that brings of gap, so as to improve the pressure of blower fan system；Air-flow can also be improved inside spiral case Mobility status, make flowing of the air-flow in spiral case more smoothly, reduce flow losses；Additionally, spiral case of the present utility model It is simple with centrifugal fan structure, it is easy for installation, it is possible to achieve the effect of preferably broken whirlpool rectification.

Description of the drawings

Fig. 1 is the schematic diagram of centrifugal blower of the present utility model；

Fig. 2 is the dimensional structure diagram of the front shroud and stator of the spiral case of centrifugal blower of the present utility model；

Fig. 3 is the rearview of the front shroud and stator of the spiral case of centrifugal blower of the present utility model；

Close-up schematic views of the Fig. 4 for Fig. 3；

Fig. 5 is the schematic diagram of the governor motion and stator of the spiral case of centrifugal blower of the present utility model；

Fig. 6 is the schematic diagram that centrifugal blower of the present utility model hides cover plate；

Fig. 7 is the schematic diagram of second embodiment of the stator of centrifugal blower of the present utility model.

Specific embodiment

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

Embodiment one

Referring to 1～6, a kind of centrifugal blower, including spiral case and the impeller 4 that is arranged in spiral case, spiral case include the ring of ring-type Above-mentioned impeller 4 is set in the cavity that wall 3 and the cover plate positioned at 3 both sides of ring wall, cover plate and ring wall 3 are collectively constituted, in the present embodiment In, cover plate includes front shroud 1 on front side of ring wall 3, and the back shroud on rear side of ring wall 3.Herein, " front " spiral case The side of air intake, " afterwards " refer to the side away from spiral case air inlet.

The inner side (towards the side in spiral case) of front shroud 1 is provided with the stator 5 of the molded line distribution along front shroud 1, leads Leaf 5 extends from front shroud 1 to back shroud 2 (length direction of stator 5), namely helically line distribution.The cross sectional shape of stator 5 can Being aerofoil profile, circular arc type or linear type.Preferably, using aerofoil profile, aerodynamic can be conformed better to so that improve stream Dynamic amplitude is larger.

Stator 5 and 1 inclined angle of front shroud, the angle between the chord length direction of stator 5 and the molded line tangent line of front shroud 1 Between line direction and the molded line tangent line of front shroud 1 between the upstream side for being θ, i.e. air-flow when stator 5 and downstream Angle is θ, it is preferred that θ is 10 °～50 °.

In order to further improve efficiency, spiral case is also included for adjusting the governor motion of the angle, θ of stator 5, including setting Drive mechanism 61 on the outside of the front shroud 1, and drive mechanism 61 the first gear 62 of output shaft connection, and and first gear The second gear 63 of 62 engagements, second gear 63 are arranged on stator 5 towards the one end outside front shroud 1, in the present embodiment, drive Mechanism 61 adopts motor.Thus, when the motor is energized, drive first gear 62 to rotate by output shaft, thus drive the second tooth Wheel 63 is rotated, so as to drive stator 5 to rotate.Can be by the stroke of controlled motor, so as to control the angle of the rotation of stator 5.Can To arrange air flow sensor on the outlet housing 7 that the air outlet of centrifugal blower is arranged, for detecting air quantity or wind speed, so as to reality When control drive mechanism 61 stroke, stator 5 is turned to into suitable angle.When air quantity increases, the angle, θ of stator 5 becomes Little, when air quantity reduces, then the angle, θ of stator 5 becomes big, thus can largely improve fume-exhausting efficiency.

Angle between two adjacent stators 5, i.e., the angle δ between the center of two stators 5, it is preferred that 25 °≤δ ≤ 30 °, if angle is too small, stator 5 can be interfered when moving, if angle is excessive, improve leakage and the work for flowing With weakening, while also can mismatch with impeller 4.

Leaves of width (size of the stator 5 between front shroud 1 and back shroud 2 on the bearing of trend) B of stator 5 for impeller 4 The 1/3～1/4 of piece height H, if width B is excessive, easily produces impact to middle air flow, and if width B is too small, improvement is let out Leakage and the effect flowed can then weaken.

The ratio between gap and the diameter of impeller 4 between 4 periphery of stator 5 and impeller is more than 0.05, is conducive to reducing The noise of centrifugal blower.

In the present embodiment, as the leakage between impeller 4 and front shroud 1 is larger, therefore stator 5 is arranged on front shroud 1 On, alternatively, stator 5 can also be arranged on back shroud 2, extended towards front shroud 1.As long as i.e. so that stator 5 is arranged on Cover plate is distributed towards the side inside spiral case, along molded line, and is extended to the inside of spiral case, thus not only can reduce snail Gap between the cover plate and impeller 4 of shell is revealed loss but also can improve mobility status of the air-flow inside spiral case with rectification, Make flowing of the air-flow in spiral case more smoothly.

Embodiment two

Referring to Fig. 7, in the present embodiment, the difference with above-described embodiment one is, as air-flow is in the axle of impeller 4 Certain inhomogeneities, therefore stator 5 are presented upwards using the spatially ternary blade in distorted shape, it is possible thereby to improve this Plant inhomogeneities so that flowing change is more uniform.

Claims (10)

1. a kind of spiral case, including ring wall (3) and the cover plate positioned at ring wall (3) side, it is characterised in that：Set on the inside of the cover plate Be equipped with the stator (5) that the molded line along the cover plate is spaced apart, the stator (5) from the cover plate to spiral case inside extend and With certain width (B).

2. spiral case as claimed in claim 1, it is characterised in that：The molded line tangent line of stator (5) the chord length direction and cover plate it Between angle form the inclined angle (θ) of stator (5) opposing cover plates, the angle (θ) is 10 °～50 °.

3. spiral case as claimed in claim 2, it is characterised in that：The spiral case is also included for adjusting the inclined angle of stator (5) The governor motion of degree (θ), the governor motion include drive mechanism (61), are connected to the drive mechanism (61) and stator (5) Between drive mechanism.

4. spiral case as claimed in claim 3, it is characterised in that：The drive mechanism (61) is to be arranged on the outside of the cover plate Motor, first gear (62) that the drive mechanism includes being connected with the output shaft of the drive mechanism (61), and with it is described The second gear (63) that first gear (62) is engaged, the second gear (63) are arranged on the stator (5) towards on the outside of cover plate One end.

5. spiral case as claimed in claim 1, it is characterised in that：Angle between two adjacent stators (5) is δ, 25 °≤δ ≤30°。

6. spiral case as claimed in claim 1, it is characterised in that：The cross sectional shape of the stator (5) is aerofoil profile.

7. spiral case as claimed in claim 1, it is characterised in that：The stator (5) is ternary blade.

8. spiral case as claimed in claim 1, it is characterised in that：The cover plate includes being arranged on the front shroud on front side of ring wall (3) (1), and the back shroud (2) that is arranged on rear side of ring wall (4), the stator (5) is arranged on the inner side of the front shroud (1).

9. a kind of application is provided with leaf in the spiral case just like the centrifugal blower of the spiral case any one of claim 1～8 Wheel (4), it is characterised in that：The width (B) of the stator (5) for the blade height (H) of impeller (4) 1/3～1/4.

10. centrifugal blower as claimed in claim 9, it is characterised in that：Between between the stator (5) and impeller (4) periphery Ratio between the diameter of gap and impeller (4) is more than 0.05.