CN104595242B - A kind of adjustable centrifugal blower of air inlet - Google Patents
A kind of adjustable centrifugal blower of air inlet Download PDFInfo
- Publication number
- CN104595242B CN104595242B CN201410834487.3A CN201410834487A CN104595242B CN 104595242 B CN104595242 B CN 104595242B CN 201410834487 A CN201410834487 A CN 201410834487A CN 104595242 B CN104595242 B CN 104595242B
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- China
- Prior art keywords
- air inlet
- circle
- arc
- centrifugal blower
- shaped
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
Abstract
The invention discloses a kind of adjustable centrifugal blower of air inlet, including spiral case and the impeller being arranged in spiral case, it is provided with air inlet circle in the air intake end of described impeller, it is characterized in that: described air inlet circle is the special-shaped air inlet circle that can rotate in air inlet plane under the driving of drive mechanism, air inlet shape changes accordingly with the rotation of described special-shaped air inlet circle and adapts to air inlet under difference outlet pressure environment for the blower fan and requires.Compared with prior art, it is an advantage of the current invention that: the adjustable centrifugal blower of this air inlet is by the lower special-shaped air inlet circle that can rotate in air inlet plane of driving being arranged on drive mechanism, abnormity air inlet circle can regulate air inlet shape after rotating, the air inlet making air inlet shape adapt under the different outlet pressure environment of blower fan requires, reaches to increase the effect reducing backflow under flow and outlet hyperbaric environment under outlet environment under low pressure.
Description
Technical field
The present invention relates to a kind of centrifugal blower, especially relate to a kind of adjustable centrifugal blower of air inlet.
Background technology
Blower fan system many employings small volume of current range hood and flow and the relatively large many winged petioles of pressure centrifuge wind
Machine, and the current collector of many winged petioles centrifugal blower (air inlet circle) is substantially all employing circle.Such as Patent No. ZL
" a kind of oil suction disclosed in the utility model patent of 201420476452 (Authorization Notice No. is CN 203975597 U)
The centrifugal blower of cigarette machine ", this centrifugal blower includes spiral case, the impeller being installed in spiral case, is arranged on entering of impeller end face
Solar or lunar halo and the motor driving impeller motion, its spiral case includes spiral case top board, spiral case top board is provided with some air inlet rings and fixes
Buckle, the corresponding fixing buckle in air inlet ring edge is provided with the draw-in groove of equal number, and air inlet ring is fixed on spiral case top by draw-in groove
The fixing card of plate is buckled.And for example Patent No. ZL 201320524594.5 (Authorization Notice No. is CN 203454243 U)
" air inlet ring of range hood and there is its range hood " disclosed in Chinese utility model patent, this air inlet circle
Including circle body, the upper end of circle body is provided with the first mounting flange extending radially outwardly along circle body, and the lower end of circle body is provided with
The second mounting flange extending radially inward, the first mounting flange can be connected with deflector, and the second mounting flange can be with
Spiral case is connected.Air inlet circle disclosed in above-mentioned two parts of patents is fixed installation structure, and the air-admitting surface of blower fan cannot
It is adjusted.
The uniform air inlet of centrifugal blower 360 ° of hoops unlike axial flow blower itself, by many winged petioles centrifugal blower in low outlet pressure
Flow field simulation figure under the operating mode of the big flow of power it can be seen that its pressure and velocity distribution in different angles (with initial level
Line is 0 °, just increases to clockwise, is negative counterclockwise) the very big difference of upper distribution existence, near snail tongue leading portion air inlet speed
Degree and negative pressure are bigger than other regions, and i.e. blade rotates the maximum area of low pressure being formed main is in anterior-100～70 ° of snail tongue
Place, is topmost suction area herein.In addition, when range hood common duct resistance increases, return owing to spiral case is internal
Stream increases, and causes burble point to be continued toward reach from original snail tongue is anterior, makes air-flow at 30～70 ° escape substantially,
Secondary Flow is also caused air-flow to be flowed outward by air inlet circle in spiral case by the internal meridian plane of spiral case simultaneously.In the outlet of this height
Under the operating mode of pressure low discharge, increase if still using the method for-100～70 ° of area increaseds that gas will be caused to escape, this
When should reduce the air inlet area at 30～70 ° on the contrary to stop air-flow to be escaped, air-flow is suppressed back and increases blower fan simultaneously
The maximum static pressure of system.Although, prior art also has the structure that the air inlet to centrifugal blower is adjusted, but mainly
Concentrating the circular arc of the circle body cross section to air inlet circle or crown height to be changed, this adjustment structure is only to air inlet
The air inlet area of different angles uniformly adjusts, it is seen that its air inlet not adapting to centrifugal blower different angles requires.
Content of the invention
The technical problem to be solved is for above-mentioned prior art present situation, provides one that air inlet can be made to adapt to wind
The machine adjustable centrifugal blower of air inlet that air inlet requires under different outlet pressure environment.
The technical scheme that the present invention solves that above-mentioned technical problem used is: the adjustable centrifugal blower of this air inlet, including
Spiral case and the impeller being arranged in spiral case, be provided with air inlet circle, described air inlet circle in the air intake end of described impeller
For the special-shaped air inlet circle that can rotate in air inlet plane under the driving of drive mechanism, air inlet shape is with described abnormity
The rotation of air inlet circle changes accordingly and adapts to air inlet under different outlet pressure environment for the blower fan and requires, it is characterised in that:
It is provided with mounting flange in the periphery of described abnormity air inlet circle, described mounting flange circumferentially has circular arc
Shape hole, described mounting flange is arranged on described spiral case by keeper, and described circular arc is located at by described keeper
The rotational angle of abnormity air inlet circle is limited with the two ends of arc-shaped hole in hole and by colliding.
Abnormity air inlet circle can have difform air inlet, it is preferable that described special-shaped air inlet circle is long waist shaped
Air inlet circle, described long waist shaped air inlet circle has the long waist shaped air inlet that tensile deformation becomes on the physa plinth of basis, stretching
Degree is determined by following relation: set the radius of described basis circle as R, the arc section intersecting with major axis in described long waist shaped
Distance between the center of circle of the center of circle and basis circle is d, then the numerical relation of R and d meets 0.06≤d/R≤0.12.
Further preferably, described special-shaped air inlet circle is oval air inlet circle, and described oval air inlet circle has
Oval air inlet, if oval major axis corresponding to described oval air inlet is a, oval short axle is b, then a and b
Numerical relation meet 0.84≤b/a≤0.91.
It in order to the rotational angle of air inlet circle is limited, is under the original state before rotation at air inlet circle, institute
The long axis direction stating abnormity air inlet circle is perpendicular to the air-flow outflow direction of fan outlet, and described keeper is positioned at described
The centre of arc-shaped hole.
Preferably, the radian of described arc-shaped hole is 55～65 °.
Further preferably, the radian of described arc-shaped hole is 60 °.
Further preferably, described arc-shaped hole at least three and uniform point of the circumferencial direction interval along air inlet circle
Cloth, described keeper is stepped screw, and described stepped screw is at least three pieces and is located in corresponding arc-shaped hole.
So, the mounting structure of air inlet circle is not only simple, firm, and can be smoothly at air inlet under the driving of drive mechanism
Rotate in plane.
Drive mechanism can have various structures, it is preferable that described drive mechanism includes motor, travelling gear and driving rack,
Described motor is arranged on the motor fixing frame fixing with spiral case, and described travelling gear is arranged on the output shaft of described motor
On, described driving rack is the arc-shaped rack being fixed on air inlet circle and is meshed with described travelling gear, described enter
Air port circle is rotated both clockwise and counterclockwise under the transmission with driving rack for the travelling gear.
Compared with prior art, it is an advantage of the current invention that: the adjustable centrifugal blower of this air inlet is by being arranged on driving
Mechanism drives the lower special-shaped air inlet circle that can rotate in air inlet plane, can regulate after special-shaped air inlet circle rotation into
Inlet shape, makes air inlet shape adapt to air inlet under different outlet pressure environment for the blower fan and requires, reach in outlet low pressure
Increase the effect reducing backflow under flow and outlet hyperbaric environment under environment.
Brief description
Fig. 1 is embodiment of the present invention structural representation in an initial condition；
Fig. 2 is structural representation under low outlet pressure environment for the embodiment of the present invention；
Fig. 3 is structural representation under high outlet pressure environment for the embodiment of the present invention；
Fig. 4 is the structural representation of the drive mechanism of the embodiment of the present invention；
Fig. 5 is the structural representation of the long waist shaped air inlet circle of the embodiment of the present invention；
Fig. 6 is the structural representation of the oval air inlet circle of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Figure 1 to Figure 3, the adjustable centrifugal blower of the air inlet in the present embodiment includes spiral case 1 and is arranged on snail
Impeller 2 within shell 1, is provided with abnormity air inlet circle on the air intake end face of impeller 2, and abnormity air inlet circle is at the machine of driving
Rotating in air inlet plane under the driving of structure 5, air inlet shape can change accordingly with the rotation of abnormity air inlet circle, and
And, the air inlet shape after change adapts to air inlet under the operating modes such as low outlet pressure and high outlet pressure for the blower fan and requires.
In conjunction with shown in Fig. 4, the drive mechanism 5 in the present embodiment includes motor the 51st, travelling gear 52 and driving rack 53,
Wherein, motor 51 uses stepper motor, and stepper motor is arranged on the motor fixing frame 54 fixing with spiral case 1, passes
Moving gear 52 is arranged on the output shaft of motor, driving rack 53 for the arc-shaped rack that is fixed on air inlet circle and with
Travelling gear 52 is meshed.During stepper motor work, driven by the transmission of travelling gear 52 and driving rack 53 and pass
Carry-over bar rotates clockwise and anticlockwise, and then drives air inlet circle to be rotated both clockwise and counterclockwise so that air inlet
Circle positive and negative in certain angular range can adjust attitude.
In conjunction with shown in Fig. 5, abnormity air inlet circle is long waist shaped air inlet circle 31, and long waist shaped air inlet circle 31 has at base
The long waist shaped air inlet 32 that on the basis of plinth circle 7, tensile deformation becomes, basis circle is an imaginary circles, its size and impeller air intake
The bore of port is consistent.Through experiment, the level of stretch of long waist shaped air inlet circle 31 is determined by following relation: set basis
The radius of circle is R, and the distance between the center of circle of the center of circle of the arc section intersecting with major axis in long waist shaped and basis circle is d,
Then the numerical relation of R and d meets 0.06≤d/R≤0.12.Additionally, the part intersecting with short axle in long waist shaped can be straight
Line segment, it is also possible to be segmental arc.
It is provided with mounting flange 33 in the periphery of long waist shaped air inlet circle 31, mounting flange 33 is circumferentially spaced
Being evenly equipped with four arc-shaped holes 34, mounting flange 33 is arranged on spiral case 1 by stepped screw 4, and stepped screw 4 has
Four pieces and be located in corresponding arc-shaped hole 34.The use of stepped screw 4 can ensure that air inlet circle can be at air inlet
Rotate freely in plane, can avoid causing incoming air area to lose simultaneously, and by stepped screw 4 and arc-shaped hole 34
Two ends collide and can limit the rotational angle of air inlet circle.In the present embodiment, the radian of arc-shaped hole 34 is 60 °,
Air inlet circle is under the original state before rotation, and the long axis direction of long waist shaped air inlet circle 31 is perpendicular to fan outlet 6
Air-flow flow out direction, and stepped screw 4 is positioned at the centre of arc-shaped hole 34, i.e. air inlet circle can be in original state
On the basis of turn clockwise 30 ° or counterclockwise rotate 30 °.
As it is shown in figure 1, long waist shaped air inlet circle 31 rotate before original state under, long waist shaped air inlet circle 31
The air-flow that long axis direction is perpendicular to fan outlet 6 flows out direction, and stepped screw 4 is positioned at the centre of arc-shaped hole 34,
Now, the initial angle of long waist shaped air inlet circle 31 is set to 0 °.
As in figure 2 it is shown, motor 51 drives long waist shaped air inlet circle 31 to turn clockwise 30 °, now, stepped screw
4 offset with one end of corresponding arc-shaped hole 34, the air inlet area at 30～70 ° of the corresponding spiral case 1 of long waist shaped long axis direction
There is a larger increase, allow airflow into low-pressure area more rapid, thus be effectively lifted at the big flow rate working conditions of the low outlet pressure of blower fan
Under flow.After the level of stretch of long waist shaped air inlet circle 31 meets 0.06≤d/R≤0.12, at long waist shaped air inlet circle
31 turn clockwise 30 ° in the case of, flow increase is the most obvious.When carrying out range hood test, low outlet pressure
The i.e. big flow region in region has 3% (0.5 cubic metre/min) relative to the circular air inlet circle flow of same air-admitting surface
The increase of left and right.
As it is shown on figure 3, motor 51 drives long waist shaped air inlet circle 31 to have rotated 30 ° counterclockwise, now stepped screw 4
Offset with the other end of corresponding arc-shaped hole 34, due to air inlet face at 30～70 ° of the corresponding spiral case 1 of long waist shaped short-axis direction
Long-pending have bigger reduction, thus to stoping escape to have better effects, suppresses away air-flow, can also increase blower fan system simultaneously
Maximum static pressure, the increase of maximum static pressure can be obviously improved smoke discharging effect under big resistance for the blower fan.Through experiment, R with
When the numerical relation of d meets 0.06≤d/R≤0.12, in the case that long waist shaped air inlet circle 31 rotates 30 ° counterclockwise,
There is obvious higher-pressure region increase export the effect of pressure.When carrying out range hood test, high outlet pressure region is i.e. little
Flow region has the increase of 6-7% (25Pa-30Pa) left and right relative to the circular air inlet circle flow of same air-admitting surface.
Air-admitting surface in the present embodiment can automatically adjust, and is provided with corresponding low outlet pressure on range hood
The button of high outlet pressure with correspondence, presses the button of corresponding low outlet pressure, and motor rotates forward and drive abnormity air intake
Mouth circle turns clockwise 30 °, presses the button of corresponding high outlet pressure, and motor rotates backward and drive abnormity air inlet circle
Rotate 30 ° counterclockwise, thus realize the automatic adjustment of abnormity air inlet circle.In addition, with the rotating of button control motor
It is any technique commonly known means, not reinflated description at this.
As shown in Figure 6, abnormity air inlet circle is oval air inlet circle 35, and oval air inlet circle 35 has ellipse
Air inlet 36.If oval major axis corresponding to oval air inlet 36 is a, oval short axle is b, then the number of a and b
When value relation meets 0.84≤b/a≤0.91, oval air inlet circle 35 is the special-shaped air inlet circle of optimum structure.Remaining knot
Structure is identical with the structure using long waist shaped air inlet circle, does not launch at this to describe.
The foregoing is only the preferred embodiment of the present invention, it is noted that for those of ordinary skills,
Under the premise of the principle without departing from the present invention, multiple remodeling can be carried out to the present invention or improve, such as abnormity air inlet circle
Air inlet shape also can use shape or other suitable shapes of similar cam, only need to coordinate entering of centrifugal blower
The change of gas distribution adjusts and just can find the parameter logistic of air inlet shape, and these are regarded as the protection model of the present invention
Within enclosing.
Claims (8)
1. the adjustable centrifugal blower of air inlet, including spiral case (1) and the impeller (2) being arranged in spiral case, described
The air intake end of impeller is provided with air inlet circle, and described air inlet circle is can be at air inlet under the driving of drive mechanism (5)
The special-shaped air inlet circle rotating in plane, air inlet shape changes accordingly with the rotation of described abnormity air inlet circle and adapts to wind
Air inlet under different outlet pressure environment for the machine requires, it is characterised in that: it is provided with peace in the periphery of described abnormity air inlet circle
Dress flange (33), circumferentially has arc-shaped hole (34), described mounting flange (33) on described mounting flange (33)
Be arranged on described spiral case (1) by keeper, in described arc-shaped hole (34) is located at by described keeper and by with
Collide and limit the rotational angle of abnormity air inlet circle in the two ends of arc-shaped hole.
2. the adjustable centrifugal blower of air inlet according to claim 1, it is characterised in that: described abnormity enters
Air port circle is long waist shaped air inlet circle (31), and described long waist shaped air inlet circle (31) has tensile deformation on the physa plinth of basis
The long waist shaped air inlet (32) becoming, level of stretch is determined by following relation: set the round radius in described basis as R, described length
Distance between the center of circle of the center of circle of the arc section intersecting with major axis in kidney-shaped and basis circle is d, then the numerical value of R and d closes
System meets 0.06≤d/R≤0.12.
3. the adjustable centrifugal blower of air inlet according to claim 1, it is characterised in that: described abnormity enters
Air port circle is oval air inlet circle (35), and described oval air inlet circle (35) has oval air inlet (36), if institute
Stating oval major axis corresponding to oval air inlet (36) is a, and oval short axle is b, then the numerical relation of a and b meets
0.84≤b/a≤0.91。
4. the adjustable centrifugal blower of air inlet according to claim 1, it is characterised in that: at air inlet circle
Under original state before rotating, the air-flow that the long axis direction of described abnormity air inlet circle is perpendicular to fan outlet (6) flows out
Direction, and described keeper is positioned at the centre of described arc-shaped hole (34).
5. the adjustable centrifugal blower of air inlet according to claim 1, it is characterised in that: described arc-shaped hole
(34) radian is 55～65 °.
6. the adjustable centrifugal blower of air inlet according to claim 5, it is characterised in that: described arc-shaped hole
(34) radian is 60 °.
7. the adjustable centrifugal blower of air inlet according to claim 1, it is characterised in that: described circular arc
Hole (34) at least three and along air inlet circle circumferencial direction interval be uniformly distributed, described keeper is stepped screw
, and described stepped screw (4) at least three pieces in being located at corresponding arc-shaped hole (34) (4).
8. the adjustable centrifugal blower of air inlet according to claim 1, it is characterised in that: described drive mechanism
(5) including motor (51), travelling gear (52) and driving rack (53), described motor (51) is arranged on and fixes with spiral case (1)
On motor fixing frame (54), described travelling gear (52) is arranged on the output shaft of described motor, described driving rack (53)
Be meshed for the arc-shaped rack that is fixed on air inlet circle and with described travelling gear (52), described air inlet circle is in transmission
Gear (52) is rotated both clockwise and counterclockwise under the transmission of driving rack (53).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834487.3A CN104595242B (en) | 2014-12-29 | 2014-12-29 | A kind of adjustable centrifugal blower of air inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834487.3A CN104595242B (en) | 2014-12-29 | 2014-12-29 | A kind of adjustable centrifugal blower of air inlet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104595242A CN104595242A (en) | 2015-05-06 |
| CN104595242B true CN104595242B (en) | 2016-11-09 |
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| CN201410834487.3A Active CN104595242B (en) | 2014-12-29 | 2014-12-29 | A kind of adjustable centrifugal blower of air inlet |
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| CN105650029B (en) * | 2016-03-10 | 2018-01-16 | 江苏大学 | A kind of circle air door adjusted for compressor flow with import current stabilization |
| CN106640763B (en) * | 2016-10-20 | 2022-11-25 | 宁波方太厨具有限公司 | Air inlet ring and centrifugal fan adopting same |
| CN106762837B (en) * | 2016-12-16 | 2023-04-14 | 宁波方太厨具有限公司 | Centrifugal fan volute for range hood |
| CN109139559A (en) * | 2018-10-10 | 2019-01-04 | 浙江琦远科技有限公司 | A kind of multidirectional spiral case and its two-way blower fan |
| CN111765123A (en) * | 2019-04-01 | 2020-10-13 | 博西华电器（江苏）有限公司 | Range hood's fan and range hood |
| CN110145481B (en) * | 2019-05-30 | 2021-01-19 | 宁波方太厨具有限公司 | Air inlet ring and centrifugal fan with same |
| CN110374927B (en) * | 2019-06-26 | 2021-01-12 | 宁波方太厨具有限公司 | Fan blower |
| CN112228930B (en) * | 2020-09-11 | 2022-01-21 | 宁波方太厨具有限公司 | Air inlet ring, fan system with air inlet ring and range hood |
| CN112628974B (en) * | 2020-12-07 | 2021-11-30 | 珠海格力电器股份有限公司 | Air conditioner control method, system, medium, equipment, air supply device and application |
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| CN104595242A (en) | 2015-05-06 |
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