CN207131636U - A kind of centrifugal blower - Google Patents
A kind of centrifugal blower Download PDFInfo
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- CN207131636U CN207131636U CN201721198418.3U CN201721198418U CN207131636U CN 207131636 U CN207131636 U CN 207131636U CN 201721198418 U CN201721198418 U CN 201721198418U CN 207131636 U CN207131636 U CN 207131636U
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- inner spiral
- spiral casing
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Abstract
A kind of centrifugal blower, including spiral case, impeller and motor, spiral case includes antetheca, rear wall and the annular wall being connected between antetheca, rear wall, the forward and backward side of spiral case has front side air inlet and rear side air inlet respectively, impeller includes mid-game, front side inner spiral casing is installed on the internal face of spiral case antetheca, rear side inner spiral casing is installed on the internal face of spiral case rear wall.The centrifugal blower passes through the inner spiral casing on front side of the installation of the internal face of spiral case antetheca, rear side inner spiral casing is installed on the internal face of spiral case rear wall, i.e. using the double-suction type inner spiral casing structure to match with double-entry impeller, the diffusion ability of spiral case can further be improved, realize the recovery of impeller outlet kinetic energy, strengthen effective acting ability of impeller, so as to effectively reduce flow losses and reduce fan noise, and, before, rear side inner spiral casing also plays the effect of anti-vortex ring, reduce the gap of blades front disk and hub disk and spiral case, and then reduce the loss of the leakage inside blower fan system.
Description
Technical field
It the utility model is related to a kind of centrifugal blower.
Background technology
The impeller of double-suction type multi-wing centrifugal fan is double-sided impeller, and double-sided impeller has larger discharge coefficient because of it
And obtained in European type cooker hood widely used.The blade of current double-suction type multi-wing centrifugal fan blade is blade passage
It is short, and blade is long, if to strengthen the effect of fume-exhausting, it is necessary to further lift its aeroperformance, if further added
Linear leaf, because impeller is rotatable parts so that easily occur unbalance dynamic in rotation process, and then produce extra noise.
And by increasing rotating speed improving performance, the increase of noise can be brought.Also, double-suction type multi-wing centrifugal fan is pacified because of it in complete machine
The limitation of dress mode, causes that the flow difference of front and rear sides air intake is big, and blade exit air-flow difference is big, if using identical snail
It if shell mould line carries out diffusion, will make it that outlet housing exit flow is uneven, and then cause noise increase and fan performance to deteriorate.
The main purpose of double-suction type spiral case is to reclaim the kinetic energy of double-entry impeller outlet, lifts the pressure of whole blower fan system, therefore spiral case
It is even more important with the matched design of impeller type.
The double-suction type multi-wing centrifugal fan system being currently used in range hood, due to the limitation of appearance and size, it drives
Motor is typically mounted at the side of spiral case, while there is also impeller both sides air intake is highly variant, these reasons finally result in
Bilateral is not the relation of equivalent into the flow in impeller simultaneously, in the case of identical blade parameter, cause both sides from
Great inhomogeneities is presented in the air-flow that impeller outlet is flowed into spiral case, not only brings substantial amounts of flow losses, noise also increases
Add.Therefore, in order to improve this situation, it is contemplated that the particularity of multi-wing centrifugal fan, it is necessary to be improved to volute structure, with
Improve the uniformity of exit flow, and then improve fan efficiency and reduce the purpose of noise.
Utility model content
Technical problem to be solved in the utility model is to be directed to above-mentioned state of the art, there is provided one kind can improve outlet
The relatively small double-suction type multi-wing centrifugal fan of inhomogeneities, the size of air-flow.
Technical scheme is used by the utility model solves above-mentioned technical problem：The centrifugal blower, including spiral case, impeller
And motor, the spiral case include antetheca, rear wall and the annular wall being connected between antetheca, rear wall, the forward and backward side of spiral case has respectively
Have a front side air inlet and rear side air inlet, the impeller includes mid-game, and the motor is arranged on the rear side of spiral case, motor it is defeated
Shaft is connected in the mid-game, it is characterised in that：Front side inner spiral casing is installed on the internal face of the spiral case antetheca, in institute
State and rear side inner spiral casing is installed on the internal face of spiral case rear wall.
Preferably, the front side inner spiral casing is around the front side air inlet, and the rear side inner spiral casing is located at described
Around rear side air inlet.
Further preferably, the back edge of the front side inner spiral casing is adjacent to the front end face of the impeller, the rear side inner spiral casing
Rear end face of the front along the neighbouring impeller.
The molded line of front side inner spiral casing and rear side inner spiral casing can have various structures, it is preferable that the type of the front side inner spiral casing
The molded line of line and rear side inner spiral casing includes straightway and curved section, and the straightway is adjacent to the air outlet of the blower fan, song
The initiating terminal of line segment is the lower end of straightway, and the end end of curved section is connected on the straightway and tie point is close to straight line
The upper end of section.
Further preferably, component of the wheel nose muzzle velocity in axial direction is C2m, wheel nose muzzle velocity
The component of circumferencial direction is C2u, impeller outer diameter R2, and the base circle diameter (BCD) of spiral case is R0, and the polar radius of front side inner spiral casing is R, leaf
Vertical range between the mid-game of wheel and front side inner spiral casing is B0, and the width of front side inner spiral casing is B1, front side inner spiral casing it is initial
Angle is θ 0, then meets equation below：
Further preferably, component of the impeller back outlet speed in axial direction is C2m ＇, impeller back outlet speed
It is C2u ＇ in the component of circumferencial direction, impeller outer diameter R2, the base circle diameter (BCD) of spiral case is R0, and the polar radius of rear side inner spiral casing is
R ＇, the vertical range between the mid-game of impeller and rear side inner spiral casing are B2, and the width of rear side inner spiral casing is B3, rear side inner spiral casing
Initial angle is the ＇ of θ 0, then meets equation below：
Motor can have a variety of mounting structures, it is preferable that motor mounting rack, the electricity are provided with rear side of the spiral case
Machine is arranged on described motor mounting rack.
Compared with prior art, the utility model has the advantage of：The centrifugal blower passes through the internal face in spiral case antetheca
Inner spiral casing on front side of upper installation, is provided with rear side inner spiral casing on the internal face of spiral case rear wall, that is, uses and match with double-entry impeller
Double-suction type inner spiral casing structure, air-flow distance of rubbing action in spiral case is small, can reduce wheel friction loss and reduce wind
Machine noise, the diffusion ability of spiral case is further improved, realize the recovery of impeller outlet kinetic energy, and then strengthen effective acting of impeller
Ability, also, front side inner spiral casing and rear side inner spiral casing also play the effect of anti-vortex ring, reduce blades front disk and hub disk and snail
The gap of shell, and then reduce the loss of the leakage inside blower fan system.In addition, the centrifugal blower can be in the shorter situation of blade
Under, higher aeroperformance is realized, blower sizes can be made relatively small.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment；
Fig. 2 is the structural representation of another angle of the utility model embodiment；
Fig. 3 is the decomposing schematic representation of the utility model embodiment；
Fig. 4 is the structure sectional view of the utility model embodiment；
Fig. 5 is the side view of the utility model embodiment；
Fig. 6 is the structure sectional view of B-B direction in Fig. 5；
Fig. 7 be Fig. 5 in C-C to structure sectional view.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Figure 1 to Figure 3, the centrifugal blower in the present embodiment include spiral case 1, impeller 2, motor 3, front side inner spiral casing 4,
Rear side inner spiral casing 5 and motor mounting rack 6.
Antetheca 11, rear wall 12 as before are included to, spiral case 1 using direction shown in arrow A in Fig. 1 and be connected to antetheca, rear wall it
Between annular wall 13, the forward and backward side of spiral case 1 has front side air inlet 14 and rear side air inlet 15 respectively, and impeller 2 includes mid-game
21st, shroud 22 and hub disk 23, the front and rear sides of mid-game 21 form advance air port and the rear air inlet of impeller 2, motor installation respectively
Frame 6 is arranged on the rear side of spiral case 1, and motor 3 is arranged on motor mounting rack 6.The output shaft of motor 3 is connected in mid-game 21, electricity
Mid-game 21 is driven to rotate when machine 3 rotates, and then impeller 2 rotates.Said structure and existing double-suction type multi-wing centrifugal fan
Structure is identical, herein not specifically expansion description.
In the present embodiment, front side inner spiral casing 4 is arranged on the internal face of spiral case antetheca 11, and front side inner spiral casing 4 is located at front side
Around air inlet 14, and the front end face of the back edge adjacent impeller 2 of front side inner spiral casing 4.After rear side inner spiral casing 5 is arranged on spiral case
On the internal face of wall 12, rear side inner spiral casing 5 is around rear side air inlet 15, and the front of rear side inner spiral casing 5 is along adjacent to leaf
The rear end face of wheel 2.In addition, the molded line of front side inner spiral casing 4 and the molded line of rear side inner spiral casing 5 include straightway 71 and curved section
72, straightway 71 is adjacent to the air outlet of blower fan, and the initiating terminal of curved section 72 is the lower end of straightway 71, the end of curved section 72
End is connected on straightway 71 and tie point is close to the upper end of straightway 71.
As shown in Figures 4 to 6, if component of the front end exit speed of impeller 2 in axial direction is C2m, C2m can be with front end exit wind
Amount and the number of blade of impeller calculate, and the component in circumferencial direction according to the front end exit speed of impeller 2 is C2u, and C2u can basis
Laying angle, rotating speed and the air quantity of blade calculate, and the external diameter of impeller 2 is R2, and the base circle diameter (BCD) of spiral case 1 is R0, the pole of front side inner spiral casing 4
Radius is R, and the vertical range between the mid-game 21 of impeller 2 and front side inner spiral casing 4 is B0, and the width of front side inner spiral casing 4 is B1, preceding
The initial angle of side inner spiral casing 4 is θ 0, then meets equation below：
As shown in Fig. 4, Fig. 5 and Fig. 7, if component of the back outlet speed of impeller 2 in axial direction can basis for C2m ＇, C2m ＇
The number of blade of back outlet air quantity and impeller calculates, and the component in circumferencial direction of the back outlet speed of impeller 2 is C2u ＇, C2u ＇
It can be calculated according to the laying angle, rotating speed and air quantity of blade, the external diameter of impeller 2 is R2, and the base circle diameter (BCD) of spiral case 1 is R0, in rear side
The polar radius of spiral case 5 is R ＇, and the vertical range between the mid-game 21 of impeller 2 and rear side inner spiral casing 5 is B2, rear side inner spiral casing 5
Width is B3, and the initial angle of rear side inner spiral casing 5 is the ＇ of θ 0, then meets equation below：
It the foregoing is only preferred embodiment of the present utility model, it is noted that for those of ordinary skill in the art
For, under the premise of principle of the present utility model is not departed from, a variety of remodeling or improvement can be carried out to the utility model, these are equal
It is considered as within the scope of protection of the utility model.
Claims (6)
1. a kind of centrifugal blower, including spiral case (1), impeller (2) and motor (3), the spiral case (1) includes antetheca (11), rear wall
(12) and the annular wall (13) that is connected between antetheca, rear wall, the forward and backward side of spiral case (1) has front side air inlet (14) respectively
With rear side air inlet (15), the impeller (2) includes mid-game (21), and the motor (3) is arranged on the rear side of spiral case (1), electricity
The output shaft of machine (3) is connected in the mid-game (21), it is characterised in that：Installed on the internal face of the spiral case antetheca (11)
There is front side inner spiral casing (4), rear side inner spiral casing (5) is installed on the internal face of the spiral case rear wall (12).
2. centrifugal blower according to claim 1, it is characterised in that：The front side inner spiral casing (4) is entered located at the front side
Around air port (14), the rear side inner spiral casing (5) is around the rear side air inlet (15).
3. centrifugal blower according to claim 1, it is characterised in that：The back edge of the front side inner spiral casing (4) is adjacent to institute
State the front end face of impeller (2), the rear end face of the front of the rear side inner spiral casing (5) along the neighbouring impeller (2).
4. centrifugal blower according to claim 1, it is characterised in that：In the molded line and rear side of the front side inner spiral casing (4)
The molded line of spiral case (5) includes straightway (71) and curved section (72), the air-out of the neighbouring blower fan of the straightway (71)
Mouthful, the initiating terminal of curved section (72) is the lower end of straightway (71), and the end end of curved section (72) is connected to the straightway
(71) on and tie point is close to the upper end of straightway (71).
5. centrifugal blower according to claim 1, it is characterised in that：Impeller (2) the front end exit speed is in axial direction
Component is C2m, and the component in circumferencial direction of impeller (2) front end exit speed is C2u, and impeller (2) external diameter is R2, spiral case (1)
Base circle diameter (BCD) be R0, the polar radius of front side inner spiral casing (4) is R, between the mid-game (21) of impeller (2) and front side inner spiral casing (4)
Vertical range be B0, the width of front side inner spiral casing (4) is B1, and the initial angle of front side inner spiral casing (4) is θ 0, then meets following public
Formula：
6. centrifugal blower according to claim 1, it is characterised in that：Impeller (2) the back outlet speed is in axial direction
Component is C2m ＇, and the component in circumferencial direction of impeller (2) back outlet speed is C2u ＇, and impeller (2) external diameter is R2, spiral case
(1) base circle diameter (BCD) is R0, and the polar radius of rear side inner spiral casing (5) is R ＇, the mid-game (21) of impeller (2) and rear side inner spiral casing (5)
Between vertical range be B2, the width of rear side inner spiral casing (5) is B3, and the initial angle of rear side inner spiral casing (5) is the ＇ of θ 0, then meets
Equation below：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721198418.3U CN207131636U (en) | 2017-09-19 | 2017-09-19 | A kind of centrifugal blower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721198418.3U CN207131636U (en) | 2017-09-19 | 2017-09-19 | A kind of centrifugal blower |
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| Publication Number | Publication Date |
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| CN207131636U true CN207131636U (en) | 2018-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110966257A (en) * | 2018-09-29 | 2020-04-07 | 宁波方太厨具有限公司 | Volute and centrifugal fan applying same |
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2017
- 2017-09-19 CN CN201721198418.3U patent/CN207131636U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110966257A (en) * | 2018-09-29 | 2020-04-07 | 宁波方太厨具有限公司 | Volute and centrifugal fan applying same |
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