CN104632711A - Centrifugal blower - Google Patents
Centrifugal blower Download PDFInfo
- Publication number
- CN104632711A CN104632711A CN201410643892.7A CN201410643892A CN104632711A CN 104632711 A CN104632711 A CN 104632711A CN 201410643892 A CN201410643892 A CN 201410643892A CN 104632711 A CN104632711 A CN 104632711A
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- China
- Prior art keywords
- bellmouth
- impeller
- air
- centrifugal fan
- belled
- Prior art date
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Classifications
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- 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
- F04D29/422—Discharge tongues
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- 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
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- 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
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
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- 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
- F04D29/44—Fluid-guiding means, e.g. diffusers
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- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
Abstract
The invention provides a centrifugal blower, wherein the noise of the blower is inhibited and the overall resonance sound of the centrifugal blower is lowered. A plurality of vertically arranged blades are arranged at the peripheral part of a rotating circular plate to form a cylindrical impeller contained in a volute housing. One end surface of the volute housing is blocked by a bottom plate, and the other end surface of the volute housing is blocked by a cover plate with a first bell-shaped opening. In addition, a second bell-shaped opening is arranged to surround the first bell-shaped opening on one side of the cover plate that closer to the impeller side, so that the top end of the second bell-shaped opening is inserted into the inner side of the impeller. Meanwhile, the top end of the second bell-shaped opening is more closer to the bottom plate compared with the end portion of the cover plate.
Description
Technical field
The present invention relates to a kind of centrifugal fan for sending into wind to firing unit etc.
Background technique
As at middle blowers used such as firing units, be known to centrifugal fan (such as, patent documentation 1).Centrifugal fan comprises the impeller of the drum radially configured relative to running shaft by multiple blades and is used for holding the spiral case of impeller.This scroll casing shape becomes the radius for the running shaft of impeller and becomes large tubular along the sense of rotation of impeller, and the inner side cover plate of end side in the axial direction of the rotation shaft covering spiral case is formed to impeller guides the bellmouth of air.In addition, tangentially extended the side face from the larger side of the radius of spiral case have air-supply path.If make vane rotary, then from the inner side blow out air toward the outer side of impeller, therefore, it is possible to the air sucked from bellmouth to be sent into the firing unit etc. be connected with air-supply path.
When using such centrifugal fan, the larger noise of generation becomes problem sometimes.The noise (monomer noise) having centrifugal fan itself to send in this noise and the noise (sympathetic response sound) produced by the sympathetic response of the whole device comprising centrifugal fan.For sympathetic response sound wherein, from empirically, can be suppressed by the belled diameter (opening area) reducing to pass air into.
prior art document
patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2005-180179 publication
Summary of the invention
the problem that invention will solve
But if reduce the belled diameter of centrifugal fan, then the monomer noise that there is centrifugal fan becomes large tendency, although thus existence can suppress sympathetic response sound to be difficult to the problem suppressing monomer noise such.
The problems referred to above that the present invention's reply prior art has are made, and its object is to provide a kind of centrifugal fan that simultaneously can suppress sympathetic response sound and monomer noise.
for the scheme of dealing with problems
In order to solve the problem, centrifugal fan of the present invention have employed following structure.That is,
A kind of centrifugal fan, it comprises: the impeller of drum, and it radially configures erectting multiple blades being arranged at the peripheral edge portion of armature relative to running shaft; Spiral case, it is for holding this impeller, and is formed as the radius for described running shaft and becomes large tubular along the sense of rotation of described impeller; Base plate, it is for blocking the end face axially at described running shaft of this spiral case; Cover plate, it is for blocking the end face of the side contrary with described base plate of described spiral case, and has the 1st bellmouth for guiding air to the inner side of described impeller; And air-supply path, it is tangentially extended from the side face of the larger side of the radius for described running shaft of described spiral case; By making described vane rotary, thus to described air-supply path conveying air, it is characterized in that,
At described cover plate by the one side of described impeller side, be provided with the 2nd bellmouth than the 1st large footpath of bellmouth in 1 belled mode described in this of surrounding,
The top that described 2nd belled opening area reduces is positioned at the inner side of described impeller, and is positioned at the position leaning on described base plate side than the end by described cover plate side of described blade.
As mentioned above, in centrifugal fan, if the known belled diameter (opening area) reducing to pass air into, although then can suppress sympathetic response sound, monomer noise becomes large.At this, think that the reason producing monomer noise is as follows.First, being flowed towards the depth side (base plate side) of impeller by the air being effectively drawn into the inner side of impeller from bellmouth by making vane rotary, mainly leaning on the part of base plate side to blow out to the outside of impeller from the central authorities than blade.If the flowing collision tongue (attachment portion that the side face of the radius smaller side of Blower Housing is connected with path of blowing) of the air of this blowout, then pressure raises, therefore at blade by the gap between the end of cover plate side and cover plate, produce the adverse current towards inner side from the outside of impeller.And, this adverse current with collide from bellmouth leaked-in air and flowing is got muddled, thus generation monomer noise.Therefore, in centrifugal fan of the present invention, the 2nd bellmouth is set between bellmouth and the blade of impeller the pass air into the 1st, the 2nd belled top is inserted the position leaning on base plate side than the end by cover plate side of blade.Like this, in the gap between the end by cover plate side and cover plate of blade, the direction of the air of adverse current is bent by the depth side (base plate side) of the 2nd belled perisporium to impeller.Its result, from the Flowing Hard of the 1st bellmouth leaked-in air with disorderly because of adverse current, therefore, it is possible to suppress monomer noise.
In addition, even if arrange the 2nd bellmouth in leaning on the face of impeller side of cover plate, the opening area passed air into also can not increase, and therefore can not carry out harmful effect to sympathetic response vocal cords.And, even if reduce the 1st belled opening area, as long as also arrange the 2nd bellmouth between bellmouth and the blade of impeller the 1st just can suppress monomer noise in order to sound of not empathizing.Like this, according to centrifugal fan of the present invention, the suppression of the suppression that simultaneously can realize monomer noise song together.
In the centrifugal fan of the invention described above, also can be the position on the 2nd belled top is set in and outside radial direction, rolls the position of oblique face by cover plate side with the angle of 45 degree to base plate than from the 1st belled top.
If make the 2nd belled top to base plate side extend, then under the guiding of the 2nd belled perisporium, make the adverse current of air improve towards the effect of the depth side of impeller, therefore on reduction adverse current impact and suppress monomer noise to be effective.But, if make the 2nd belled top excessively extend, then sometimes encounter the 2nd belled top from the 1st bellmouth inflow and towards the flowing of the air of blade and produce wind friction sound.Therefore, if set the position on the 2nd belled top as mentioned above, then the 2nd belled top is difficult to block the flowing from the 1st belled air, therefore, it is possible to suppress the generation of wind friction sound.
In addition, in such centrifugal fan of the present invention, also can be, utilize the gap between the belled top of inaccessible plate resistance plug the 1st and the 2nd belled top.
By arranging this inaccessible plate, thus can not flow between the 1st bellmouth and the 2nd bellmouth from the 1st bellmouth leaked-in air, the flowing towards the air of blade becomes smooth and easy.Therefore, it is possible to the noise suppressing the flowing because of air to get muddled and produce, the low noise of centrifugal fan can be sought.
In addition, in the centrifugal fan of the invention described above, also can be integrally formed the 1st bellmouth, the 2nd bellmouth and inaccessible plate.
By being so integrally formed, thus compared with situation independently, concavo-convex (the reducing the resistance on surface) that can produce because of joint etc. at the 1st bellmouth and the 2nd belled tip side minimizing, to flow into and towards the Flowing Hard of the air of blade to produce disorder, therefore, it is possible to seek low noise further from the 1st bellmouth.
Accompanying drawing explanation
Fig. 1 is the stereogram representing the state after being disassembled by the centrifugal fan 10 of the present embodiment.
Fig. 2 represents that centrifugal fan 10 makes impeller 20 rotate and send the explanatory drawing of the appearance of wind.
Fig. 3 is the explanatory drawing of the appearance representing the adverse current producing air near tongue 50c.
Fig. 4 represents the explanatory drawing suppressing the reason of monomer noise by arranging the 2nd bellmouth 58 on upper plate 56.
Fig. 5 is the chart of the relation represented between the minimum diameter of the 2nd bellmouth 58 being formed at upper plate 56 and the noise figure measured centrifugal fan 10.
Fig. 6 is the chart of the relation represented between the height of the 2nd bellmouth 58 being formed at upper plate 56 and the noise figure measured centrifugal fan 10.
Fig. 7 is the explanatory drawing for the position that suppresses wind friction sound to produce on the top representing the 2nd bellmouth 58.
Fig. 8 is the explanatory drawing of the structure of the centrifugal fan 10 representing the 1st variation.
Fig. 9 is the explanatory drawing of the structure of the centrifugal fan 10 representing the 2nd variation.
Embodiment
Fig. 1 is the stereogram representing the state after being disassembled by the centrifugal fan 10 of the present embodiment.This centrifugal fan 10 is connected with the firing unit (omit and illustrate) being such as built-in with burner, for carrying combustion air to burner.As shown in the figure, centrifugal fan 10 comprise produce wind by rotating impeller 20, for the drive motor 30 that makes impeller 20 rotate and the Fan casing 50 etc. for holding impeller 20.
The impeller 20 of the present embodiment is so-called multiblade fan, its become the running shaft 32 of drive motor 30 multiple blades 24 axially slenderly formed relative to running shaft 32 radially and the drum configured at predetermined intervals.One end (lower end in figure) of described blade 24 is installed on the peripheral edge portion of the armature 22 of circular, and the other end (upper end in figure) of blade 24 is installed on the support plate 26 of ring-type.Armature 22 is fixed on the running shaft 32 of drive motor 30 in central authorities, and under the driving of drive motor 30, impeller 20 rotates centered by running shaft 32.
Fan casing 50 is by being joined together base plate 52, all wallboards 54 and upper plate 56 and being formed, this base plate 52 is fixed on the main body of drive motor 30, within this week, wallboard 54 bends in the mode of surrounding the periphery of impeller 20, and this upper plate 56 is relative with base plate 52 across all wallboards 54.And be provided with guide plate 70 in the outside (upside in figure) of upper plate 56, this guide plate 70 is formed with the 1st bellmouth 72 for guiding air to the inner side of impeller 20.Open centre and the running shaft 32 of the 1st bellmouth 72 are located along the same line.In addition, the present embodiment guide plate 70 close contact and be fixed on upper plate 56.In addition, base plate 52, all wallboards 54, upper plate 56, guide plate 70 can be formed by metal plate by punch process etc.In addition, the upper plate 56 of the present embodiment and guide plate 70 are equivalent to " cover plate " of the present invention.
Upper plate 56 is formed the 2nd bellmouth 58 that opening area diminishes towards the inside of Fan casing 50.Open centre and the running shaft 32 of the 2nd bellmouth 58 are located along the same line.In addition, the minimum diameter (internal diameter of the tip side that opening area reduces) of the 2nd bellmouth 58 is greater than the minimum diameter of the 1st bellmouth 72, and be less than the internal diameter of impeller 20, therefore the 2nd bellmouth 58 is between the 1st bellmouth 72 and the blade 24 of impeller 20.
Fig. 2 represents that centrifugal fan 10 makes impeller 20 rotate and send the explanatory drawing of the appearance of wind.In fig. 2, show and utilize the plane cutting centrifugal fan 10 vertical with the running shaft 32 of drive motor 30 and the sectional view that obtains.First, as shown in the figure, Fan casing 50 (all wallboards 54) comprises the spiral case 50a surrounding the impeller 20 and air-supply path 50b be connected with the firing unit etc. sending into air by centrifugal fan 10.Spiral case 50a is formed as the radius for the running shaft 32 of drive motor 30 and becomes large tubular along the sense of rotation (be counterclockwise at illustrated example) of impeller 20.And, from the side face tangentially extended air-supply path 50b having rectangular cross-section of the larger side of the radius of spiral case 50a, be provided with ejiction opening 60 at the end of air-supply path 50b.
Multiple blades 24 of impeller 20 are arranged along the mode that the sense of rotation of impeller 20 is bending with its outer circumferential side.If impeller 20 rotates under the driving of drive motor 30, then produce the flowing of the inner side air toward the outer side from impeller 20 under the influence of centrifugal force, the air sucked from the 1st bellmouth 72 blows out between multiple blade 24.In fig. 2, the flowing of the air in centrifugal fan 10 is represented with the arrow of single dotted broken line.Then, the air after blowout rotates along the internal surface of the spiral case 50a of Fan casing 50 (all wallboards 54) and advances, and is sprayed from ejiction opening 60 by air-supply path 50b.
But, near attachment portion (tongue) 50c that side face in the less side of the radius of spiral case 50a is connected with air-supply path 50b, create as shown in the arrow as marked reference character A in Fig. 2 from the outside of impeller 20 towards the adverse current of the air of inner side.
Fig. 3 is the explanatory drawing of the appearance representing the adverse current producing air near tongue 50c.In figure 3, show to utilize and comprise the running shaft 32 of drive motor 30 and the plane cutting centrifugal fan 10 facing with tongue 50c and the sectional view that obtains.The arrow of the single dotted broken line in figure represents the flowing of the air in centrifugal fan 10.First, the basic flowing of the air produced by the rotation of impeller 20 is described.Flowed into by the air that is effectively drawn into the inner side of the impeller 20 depth side (base plate 52 side) towards the axis of running shaft 32 from the 1st bellmouth 72 by making impeller 20 rotate.Therefore, the air blown out by the outside to impeller 20 between multiple blade 24 mainly from the ratio central authorities of blade 24 by the part of armature 22 side (downside in figure).
Like this, if the flowing being blown out to the air in the outside of impeller 20 does not spray from ejiction opening 60 but collides with tongue 50c, then pressure near tongue 50c raises, thus produces the adverse current from the outside of impeller 20 towards the air of inner side.In gap particularly between upper plate 56 and the support plate 26 of impeller 20, air also can not be rejected by the blade 24 of the impeller 20 rotated, and therefore creates stronger adverse current.Then, such adverse current with collide from the 1st bellmouth 72 leaked-in air and flowing is got muddled, thus generation centrifugal fan 10 noise (monomer noise).In addition, when reducing minimum diameter (opening area) of the 1st bellmouth 72, existing and being easy to be subject to the impact of adverse current and the noise figure of this monomer noise becomes large tendency from the basic flowing of the 1st bellmouth 72 leaked-in air.Therefore, in the centrifugal fan 10 of the present embodiment, on upper plate 56, be provided with the 2nd bellmouth 58 to suppress monomer noise.
Fig. 4 represents the explanatory drawing suppressing the reason of monomer noise by arranging the 2nd bellmouth 58 on upper plate 56.In the diagram, enlargedly show the side by tongue 50c of the 2nd bellmouth 58 in the sectional view of the centrifugal fan 10 shown in Fig. 3.As shown in the figure, the top (end that opening area reduces) of the 2nd bellmouth 58 enters the position of ratio support plate 26 by the depth side (base plate 52 side) of impeller 20 of impeller 20, and is configured between the 1st bellmouth 72 and the blade 24 of impeller 20.
The perisporium of the 2nd bellmouth 58 of such the present embodiment is to make to guide from the flowing of the air of adverse current inside the lateral of impeller 20 towards the mode of the depth side (downside figure) of impeller 20 in the gap between upper plate 56 and support plate 26.If so the adverse current of air is become down, then can close to the basic flowing of rotation from the 1st bellmouth 72 leaked-in air passing through impeller 20.Thus, the impact (basic Flowing Hard is disorderly with the collision because of adverse current) that the adverse current alleviating tongue 50c place is brought, therefore, it is possible to suppress the monomer noise that centrifugal fan 10 sends.
In addition, the housing of the firing unit be connected with centrifugal fan 10 etc. forms acoustic resonator, thus sometimes sends sympathetic response sound from the device entirety comprising centrifugal fan 10 and become noise.If increasing makes air to the opening area of the opening portion (being the 1st bellmouth 72 in the present embodiment) of side inflow in the impeller 20 of centrifugal fan 10, be then easy to produce this sympathetic response sound.In the centrifugal fan 10 of the present embodiment, because guide plate 70 does not arrange close contact be installed on upper plate 56 with gap, therefore air can not flow between upper plate 56 and guide plate 70, even if be provided with the 2nd bellmouth 58 on upper plate 56, also the opening area making air to side inflow in impeller 20 can not be increased, therefore harmful effect can not be carried out to sympathetic response vocal cords.And, even if reduce the opening area of the 1st bellmouth 72 in order to sound of not empathizing, also can by pre-setting the monomer noise that the 2nd bellmouth 58 suppresses centrifugal fan 10 between the 1st bellmouth 72 and the blade of impeller 20.Like this, according to the centrifugal fan 10 of the present embodiment, the suppression of the suppression that simultaneously can realize monomer noise song together.
Fig. 5 is the chart of the relation represented between the minimum diameter of the 2nd bellmouth 58 being formed at upper plate 56 and the noise figure measured centrifugal fan 10.In addition, in the example as shown in fig. 5, the internal diameter of impeller 20 is fixed as 75mm, the minimum diameter of the 1st bellmouth 72 is fixed as 46mm.In addition, at the left end of the chart of Fig. 5, show the noise figure of (when not having the 2nd bellmouth 58) when single opening is only set on upper plate 56 as comparing.In contrast to this, when the 2nd bellmouth 58 by minimum diameter being 68mm is arranged on upper plate 56, the adverse current of air becomes down (base plate 52 side) by the guiding as described above by the perisporium of the 2nd bellmouth 58, thus the impact of adverse current reduces, and therefore noise figure reduces.
And when the minimum diameter of the 2nd bellmouth 58 is set to 63mm, noise figure reduces further.Think this is because, if suitably set the interval between the 1st bellmouth 72 and the 2nd bellmouth 58, then utilize the perisporium of the 2nd bellmouth 58 to become the flowing of air down closer to the basic flowing from the 1st bellmouth 72 leaked-in air, thus alleviate disorder when confluxing.
Fig. 6 is the chart of the relation represented between the height of the 2nd bellmouth 58 being formed at upper plate 56 and the noise figure measured centrifugal fan 10.In addition, the height of the 2nd bellmouth 58 refers to from the opening surface of the larger side (the planar surface portion side of upper plate 56) of opening area to the distance the opening surface of the less side (tip side) of opening area.In addition, in the example shown in Fig. 6, the internal diameter of impeller 20 is fixed as 75mm, the minimum diameter of the 2nd bellmouth 58 is fixed as 63mm, the minimum diameter of the 1st bellmouth 72 is fixed as 46mm.As shown in the figure, when the height of the 2nd bellmouth 58 is set to 14mm compared to 10mm, noise figure reduces.Think this is because, deeper entered by the depth side (base plate 52 side) to impeller 20, the top of the 2nd bellmouth 58, thus the adverse current of air that makes of the perisporium of the 2nd bellmouth 58 described above improves towards the guiding function of the depth side of impeller 20.
But, if make the 2nd bellmouth 58 excessively extend, then sometimes to flow into and flowing towards the air of blade 24 is encountered the top of the 2nd bellmouth 58 and produces wind friction sound from the 1st bellmouth 72.Therefore, as shown in Figure 7, if the height presetting the 2nd bellmouth 58 is to make to compare from the top of the 1st bellmouth 72 outside radial direction with the face (representing with thick dashed line in the sectional view of Fig. 7) that the angle of 45 degree tilts to base plate 52 side (below figure), the top of the 2nd bellmouth 58 is arranged in the position of top plate 56 side (top of figure), then from the Flowing Hard of the air of the 1st bellmouth 72 to encounter the top (top of the 2nd bellmouth 58 is difficult to the flowing of blocks air) of the 2nd bellmouth 58, therefore, it is possible to suppress the generation of wind friction sound.
The centrifugal fan 10 of above-mentioned the present embodiment also has following variation.Below, by with the difference of above-described embodiment centered by variation is described.
Fig. 8 is the explanatory drawing of the structure of the centrifugal fan 10 representing the 1st variation.In (a) of Fig. 8, show the centrifugal fan 10 utilizing and comprise plane cutting the 1st variation of the running shaft 32 of drive motor 30 and the sectional view being amplified on the top of the 1st bellmouth 72 and the 2nd bellmouth 58 and obtain.As shown in the figure, in the centrifugal fan 10 of the 1st variation, the gap between the top being formed at the 1st bellmouth 72 of guide plate 70 and the top of the 2nd bellmouth 58 being formed at upper plate 56 is blocked by inaccessible plate 80.As shown in the stereogram in (b) of Fig. 8, this inaccessible plate 80 is formed as toroidal.
By arranging so inaccessible plate 80, thus can not flow between the 1st bellmouth 72 and the 2nd bellmouth 58 from the 1st bellmouth 72 leaked-in air, the flowing towards the air of blade 24 becomes smooth and easy.Therefore, it is possible to the noise suppressing the flowing because of air to get muddled and produce, the low noise of centrifugal fan 10 can be sought.
Fig. 9 is the explanatory drawing of the structure of the centrifugal fan 10 representing the 2nd variation.In fig .9, the upper plate 56 utilizing and comprise plane cutting the 2nd variation of the running shaft 32 of drive motor 30 and the sectional view that obtains is shown.The upper plate 56 of the 2nd variation is integrally formed with guide plate 70 by casting forming.In the upper plate 56 of the 2nd such variation, the belled inner circumferential side of wall thickness is equivalent to the 1st bellmouth 72 of embodiment, and outer circumferential side is equivalent to the 2nd bellmouth 58 of embodiment, and lower end surface is equivalent to the inaccessible plate 80 of the 1st variation.In addition, the material forming the upper plate 56 of the 2nd variation is not limited to metal, also can be resin.
By being so integrally formed the 1st bellmouth 72, the 2nd bellmouth 58, inaccessible plate 80, thus compared with situation independently, can reduce in the tip side of the 1st bellmouth 72 and the 2nd bellmouth 58 and wait and concavo-convex (resistance that reduction is surperficial) that produce because engaging, to flow into and towards the Flowing Hard of the air of blade 24 to produce disorder, therefore, it is possible to seek low noise further from the 1st bellmouth 72.
Above, describe the centrifugal fan 10 of the present embodiment and variation, but the present invention is not limited to above-described embodiment and variation, can implements in every way in the scope not departing from its purport.
description of reference numerals
10, centrifugal fan; 20, impeller; 22, armature; 24, blade; 26, support plate; 30, drive motor; 32, running shaft; 50, Fan casing; 50a, spiral case; 50b, air-supply path; 50c, tongue; 52, base plate; 54, all wallboards; 56, upper plate; 58, the 2nd bellmouth; 60, ejiction opening; 70, guide plate; 72, the 1st bellmouth; 80, inaccessible plate.
Claims (4)
1. a centrifugal fan, it comprises: the impeller of drum, and it radially configures erectting multiple blades being arranged at the peripheral edge portion of armature relative to running shaft; Spiral case, it is for holding this impeller, and is formed as the radius for described running shaft and becomes large tubular along the sense of rotation of described impeller; Base plate, it is for blocking the end face axially at described running shaft of this spiral case; Cover plate, it is for blocking the end face of the side contrary with described base plate of described spiral case, and has the 1st bellmouth for guiding air to the inner side of described impeller; And air-supply path, it is tangentially extended from the side face of the larger side of the radius for described running shaft of described spiral case; By making described vane rotary, thus to described air-supply path conveying air, it is characterized in that,
At described cover plate by the one side of described impeller side, be provided with the 2nd bellmouth than the 1st large footpath of bellmouth to surround described 1st belled mode,
The top that described 2nd belled opening area reduces is positioned at the inner side of described impeller, and is positioned at the position leaning on described base plate side than the end by described cover plate side of described blade.
2. centrifugal fan according to claim 1, is characterized in that,
Described 2nd belled top is positioned at and outside radial direction, rolls the position of oblique face by described cover plate side than from described 1st belled top with the angle of 45 degree to described base plate.
3. centrifugal fan according to claim 1 and 2, is characterized in that,
Gap between described 1st belled top and described 2nd belled top is by inaccessible plate resistance plug.
4. centrifugal fan according to claim 3, is characterized in that,
Described 1st bellmouth, described 2nd bellmouth and described inaccessible plate are integrally formed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013232823A JP5952800B2 (en) | 2013-11-11 | 2013-11-11 | Centrifugal fan |
| JP2013-232823 | 2013-11-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104632711A true CN104632711A (en) | 2015-05-20 |
| CN104632711B CN104632711B (en) | 2018-07-31 |
Family
ID=53196840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410643892.7A Active CN104632711B (en) | 2013-11-11 | 2014-11-11 | Centrifugal fan |
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| Country | Link |
|---|---|
| JP (1) | JP5952800B2 (en) |
| KR (1) | KR101659446B1 (en) |
| CN (1) | CN104632711B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438478A (en) * | 2015-05-29 | 2017-02-22 | 哈农系统 | Centrifugal blower unit especially for motor vehicle air conditioning systems |
| CN106762837A (en) * | 2016-12-16 | 2017-05-31 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020204274A (en) * | 2019-06-14 | 2020-12-24 | 株式会社マキタ | Blower |
| WO2022085149A1 (en) * | 2020-10-22 | 2022-04-28 | 三菱電機株式会社 | Centrifugal blower and air conditioning device |
| KR20220064220A (en) * | 2020-11-11 | 2022-05-18 | 삼성전자주식회사 | Air conditioner |
| WO2022113279A1 (en) * | 2020-11-27 | 2022-06-02 | 三菱電機株式会社 | Air-conditioning device |
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| JPH0558897U (en) * | 1992-01-21 | 1993-08-03 | 三菱自動車工業株式会社 | Air conditioner blower |
| CN101065260A (en) * | 2004-11-30 | 2007-10-31 | 斯佩尔汽车有限公司 | Centrifugal fan |
| JP2009041517A (en) * | 2007-08-10 | 2009-02-26 | Mitsubishi Heavy Ind Ltd | Centrifugal blower and air conditioning device for vehicle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106438478A (en) * | 2015-05-29 | 2017-02-22 | 哈农系统 | Centrifugal blower unit especially for motor vehicle air conditioning systems |
| CN106438478B (en) * | 2015-05-29 | 2019-12-03 | 翰昂汽车零部件有限公司 | Particularly for the cfentrifugal blower unit of motor vehicle air conditioner |
| CN106762837A (en) * | 2016-12-16 | 2017-05-31 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015094251A (en) | 2015-05-18 |
| KR101659446B1 (en) | 2016-09-23 |
| CN104632711B (en) | 2018-07-31 |
| KR20150054674A (en) | 2015-05-20 |
| JP5952800B2 (en) | 2016-07-13 |
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