CN211144907U - Novel centrifugal fan volute - Google Patents
Novel centrifugal fan volute Download PDFInfo
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- CN211144907U CN211144907U CN201922228650.2U CN201922228650U CN211144907U CN 211144907 U CN211144907 U CN 211144907U CN 201922228650 U CN201922228650 U CN 201922228650U CN 211144907 U CN211144907 U CN 211144907U
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Abstract
The utility model provides a novel centrifugal fan spiral case belongs to fan technical field, including spiral case, spiral case including even upper plate, lower plate and curb plate as an organic whole, spiral case center department installs the impeller, and the spiral case air outlet forms the diffusion mouth, and spiral case air outlet department is equipped with the spiral shell tongue, is fixed with the guiding device on the spiral shell tongue, and the guiding device includes boss and convex closure, and the boss is fixed on the spiral shell tongue, and the convex closure is fixed in boss one side. The volute tongue of the volute is provided with the boss and the convex hull, so that the air flow interference between the volute tongue and the impeller can be improved, the air quantity is increased, and the noise is reduced.
Description
Technical Field
The utility model relates to a fan technical field, more specifically relates to a novel centrifugal fan spiral case.
Background
Fans are widely used in various fields of national economy and in daily life of people, such as electric fans and hair dryers widely used in homes, cooling fans in computers, household air conditioners or air purifiers, and the like. With the gradual improvement of living standard, people have higher and higher requirements on the fan, and the noise is reduced as much as possible while the expected air quantity is large, and meanwhile, the abnormal sound with uncomfortable hearing feeling is eliminated. The molded line of the inner wall of the volute of the traditional ventilator, the width of the volute and the volute tongue have direct influence on the air quantity and noise of the ventilator, wherein the influence of the volute tongue on the air quantity and the noise is particularly prominent. In the ventilator, strong airflow interference exists between the impeller and the volute tongue, and the high-speed rotation of the impeller forms an eccentric vortex near the volute tongue, so that strong aerodynamic noise is generated. If the gap between the volute tongue and the impeller is increased, the air output of the fan is reduced; if the clearance between the volute tongue and the impeller is reduced, the air quantity of the fan is increased, and meanwhile, the noise is also increased, so that the auditory sense is uncomfortable.
At present, there are two main measures for solving the contradiction between the air volume and the noise: (1) adopting non-equidistant impeller inclined along the axis: the measure is mainly to disperse the noise at the fundamental frequency to the surrounding frequency to reduce the noise of the fundamental frequency; however, the included angle between the impeller and the axis is random, so that no scholars propose the optimal determination method of the included angle between the impeller and the axis, and the unequal-distance inclined impeller has a plurality of difficulties in the manufacturing process. (2) Adopting an inclined volute tongue or a V-shaped volute tongue: the measure mainly reduces the air flow interference between the volute tongue and the impeller and weakens the strength of the eccentric vortex; but the noise reduction effect of the measure is common, and the air volume of the ventilator can be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel centrifugal fan spiral case, the snail tongue department of this spiral case is equipped with boss and convex closure, can improve the air current interference between snail tongue and the impeller, promotes amount of wind, noise reduction.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a novel centrifugal fan spiral case, includes the spiral case, the spiral case is including even upper plate, lower plate and curb plate as an organic whole, spiral case center department installs the impeller, the spiral case air outlet forms the diffusion mouth, spiral case air outlet department is equipped with the snail tongue, be fixed with guiding device on the snail tongue, guiding device includes boss and convex closure, the boss is fixed on the snail tongue, the convex closure is fixed boss one side.
The utility model discloses in the preferred technical scheme, the snail tongue is located on the curb plate, the snail tongue is convex crooked, the boss sets up on the snail tongue, just the last lateral wall of boss is hugged closely the upper plate.
In a preferred technical solution of the present invention, the boss includes an arc platform, a first connecting platform and a second connecting platform, the arc platform is fixed on the inner wall of the volute tongue, and the boss and the volute tongue are concentrically arranged, and the first and last ends of the arc platform extend from one side near the volute outlet to the inside of the volute along the volute tongue; the first connecting platform is connected with the head end of the arc platform and the inner wall of the volute, and the second connecting platform is connected with the tail end of the arc platform and the inner wall of the volute.
In the preferred technical solution of the present invention, the first connecting platform is in smooth transition with the inner wall of the side plate and the inner wall of the arc platform; and the second connecting platform and the inner wall of the side plate as well as the second connecting platform and the inner wall of the arc platform are in smooth transition.
In the preferred embodiment of the present invention, the radius of the arc table is R1The radius of the volute tongue is R2，1.5≤R1：R2≤3。
The utility model discloses in the preferred technical scheme, the convex closure is fixed the lower lateral wall of boss, the convex closure respectively by first connection platform, second connect the platform the circular arc platform lateral wall extends to the curb plate inner wall, the convex closure with first connection platform, second connect the platform the junction of circular arc platform all is equipped with fillet and rounding off.
The utility model discloses in the preferred technical scheme, the circular arc platform arrives the minimum distance at convex closure top equals or is greater than width between the both sides wall about the circular arc platform.
In the preferred embodiment of the present invention, the total height of the boss and the convex hull is h1, and the impellerComprises a tray cover with the height h2，0.6<h1：h2<1.2。
In the preferred embodiment of the present invention, the boss and the convex hull are integrally formed.
The utility model has the advantages that:
the utility model provides a novel centrifugal fan volute, the volute tongue of the volute is provided with a flow guide device comprising a boss and a convex hull, the boss is fixed on the volute tongue, the convex hull is fixed on one side of the boss, the boss and the convex hull can reduce the air flow interference between the volute tongue and an impeller, and an eccentric vortex near the volute tongue is extruded out, so that the eccentric vortex flows out of the volute along with a main flow, and the energy loss of the eccentric vortex to the air flow can be reduced while the vortex noise is reduced; and the gas backflow can be reduced, and the fan efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
fig. 1 is a schematic view of the overall structure of a volute of a centrifugal fan provided by the present invention;
fig. 2 is a perspective view of the internal structure of the volute of the centrifugal fan provided by the present invention;
fig. 3 is a schematic view of the internal structure of the volute of the centrifugal fan provided by the present invention.
Reference numerals:
1. a volute; 2. an impeller; 3. a flow guide device; 11. a side plate; 12. an upper base plate; 13. a volute tongue; 14. a lower base plate; 31. a convex hull; 32. a boss; 321. a first connection station; 322. an arc table; 323. a second connecting station.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indications are changed accordingly. In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
As shown in fig. 1-3, a novel centrifugal fan volute 1 comprises a volute 1, the volute 1 comprises an upper bottom plate 12, a lower bottom plate 14 and side plates 11 which are connected into a whole, an impeller 2 is installed at the center of the volute 1, a diffusion opening is formed at an air outlet of the volute 1, a volute tongue 13 is arranged at an air outlet of the volute 1, a flow guide device 3 is fixed on the volute tongue 13, the flow guide device 3 comprises a boss 32 and a convex hull 31, the boss 32 is fixed on the volute tongue 13, and the convex hull 31 is fixed on one side of the boss 32. More specifically, the upper bottom plate 12, the lower bottom plate 14, and the side plate 11 are independent plates, and are connected to form the volute 1 by welding, a volute tongue 13 is disposed at an air inlet of the volute 1, the boss 32 and the convex hull 31 are welded to the volute tongue 13, and the boss 32 and the convex hull 31 form the flow guide device 3, so as to improve the air volume of the fan and reduce noise.
The volute casing 1 of the centrifugal fan comprises a boss 32 and a convex hull 31, wherein the flow guide device 3 is arranged at the volute tongue 13 of the volute casing 1, the boss 32 is fixed on the volute tongue 13, the convex hull 31 is fixed on one side of the boss 32, and the boss 32 and the convex hull 31 can reduce the airflow interference between the volute tongue 13 and the impeller 2. An eccentric vortex is formed near the volute tongue 13 due to the high-speed rotation of the impeller 2, so that strong aerodynamic noise is generated. The combination of the boss 32 and the convex hull 31 can extrude the eccentric vortex near the volute tongue 13, so that the eccentric vortex flows out of the volute casing 1 along with the main flow, and the energy loss of the eccentric vortex to the air flow can be reduced while the vortex noise is reduced; in addition, the combination of the boss 32 and the convex hull 31 can reduce gas backflow and improve the efficiency of the fan.
Further, the volute tongue 13 is located on the side plate 11, as shown in fig. 2, the volute tongue 13 is curved in a circular arc shape, the boss 32 is disposed on the volute tongue 13, and an upper side wall of the boss 32 is tightly attached to the upper base plate 12. Further, the boss 32 includes an arc-shaped platform 322, a first connecting platform 321 and a second connecting platform 323, the arc-shaped platform 322 is fixed on the inner wall of the volute tongue 13, the boss 32 and the volute tongue 13 are concentrically arranged, and the head end and the tail end of the arc-shaped platform 322 extend from one side close to the air outlet of the volute 1 to the inside of the volute 1 along the volute tongue 13; the first connecting platform 321 connects the head end of the circular arc platform 322 and the inner wall of the volute 1, and the second connecting platform 323 connects the tail end of the circular arc platform 322 and the inner wall of the volute 1. Furthermore, the first connecting platform 321 is in smooth transition with the inner wall of the side plate 11, and the first connecting platform 321 is in smooth transition with the inner wall of the arc platform 322; the second connecting platform 323 is in smooth transition with the inner wall of the side plate 11, and the second connecting platform 323 is in smooth transition with the inner wall of the arc platform 322. The first connecting platform 321 extends from the inner wall of the side plate 11 to the head end of the circular arc platform 322, and the second connecting platform 323 extends from the tail end of the circular arc platform 322 to the inner wall of the side plate 11, so that the circular arc platform 322 and the inner wall of the side plate 11 are smoothly transited to reduce unnecessary energy loss. Further, the radius of the arc platform 322 is R1The radius of the volute tongue 13 is R2，1.5≤R1：R2Less than or equal to 3. The arc table322 is protruded from one side of the volute tongue 13 away from one side of the volute tongue 13 and is used for interfering the airflow at the volute tongue 13, and the radius of the center line of the lug boss 32 is R obtained by research1The radius of the central line of the volute tongue 13 is R2The flow guide effect is best when the ratio of the flow guide effect to the flow guide effect is 1.5-3.
The convex hull 31 is fixed on the lower side wall of the boss 32, the convex hull 31 is respectively extended to the inner wall of the side plate 11 by the side walls of the first connecting platform 321, the second connecting platform 323 and the arc platform 322, and the joints of the convex hull 31 and the first connecting platform 321, the second connecting platform 323 and the arc platform 322 are all provided with round corners and smooth transitions. The convex hull 31 enables the smooth transition between the boss 32 and the volute tongue 13, so as to meet the requirements of fluid mechanics, and can weaken the air flow interference caused by the boss 32, so that the air flow can smoothly flow out of the volute casing 1.
Further, the minimum distance from the circular arc platform 322 to the top of the convex hull 31 is equal to or greater than the width between the upper and lower sidewalls of the circular arc platform 322. The design can weaken the air flow interference caused by the circular arc platform 322, and the air flow can smoothly flow out of the volute 1.
Further, the total height h of the boss 32 and the convex hull 31 is1The impeller 2 comprises a disk cover with the height h2，0.6<h1：h2<1.2; therefore, the flow cannot be influenced, and the backflow generated due to overlarge clearance of the volute tongue 13 can be reduced, so that the efficiency of the fan is improved.
Further, the boss 32 and the convex hull 31 are integrally formed. The convex hull 31 and the boss 32 which are integrally formed are convenient to manufacture, stable and durable in construction and high in practicability.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (9)
1. The utility model provides a novel centrifugal fan spiral case, includes the spiral case, the spiral case is including even upper plate, lower plate and curb plate as an organic whole, spiral case center department installs impeller, its characterized in that: the volute air outlet is provided with a diffusion opening, a volute tongue is arranged at the volute air outlet, a flow guide device is fixed on the volute tongue and comprises a boss and a convex hull, the boss is fixed on the volute tongue, and the convex hull is fixed on one side of the boss.
2. The new centrifugal fan volute of claim 1, wherein:
the volute tongue is positioned on the side plate and is curved in a circular arc shape, the boss is arranged on the volute tongue, and the upper side wall of the boss is tightly attached to the upper bottom plate.
3. The new centrifugal fan volute of claim 2, wherein:
the boss comprises an arc table, a first connecting table and a second connecting table, the arc table is fixed on the inner wall of the volute tongue, the boss and the volute tongue are arranged concentrically, and the head end and the tail end of the arc table extend from one side close to the air outlet of the volute to the inside of the volute along the volute tongue; the first connecting platform is connected with the head end of the arc platform and the inner wall of the volute, and the second connecting platform is connected with the tail end of the arc platform and the inner wall of the volute.
4. The new centrifugal fan volute of claim 3, wherein:
the first connecting table and the inner wall of the side plate and the first connecting table and the inner wall of the arc table are in smooth transition; and the second connecting platform and the inner wall of the side plate as well as the second connecting platform and the inner wall of the arc platform are in smooth transition.
5. The new centrifugal fan volute of claim 3, wherein:
the radius of the arc table is R1The radius of the volute tongue is R2，1.5≤R1：R2≤3。
6. The new centrifugal fan volute of claim 3, wherein:
the convex hull is fixed the lower lateral wall of boss, the convex hull by first connecting station, second connecting station, circular arc platform lateral wall extend to respectively the curb plate inner wall, the convex hull with first connecting station, second connecting station, the junction of circular arc platform all is equipped with fillet and rounding off.
7. The new centrifugal fan volute of claim 5, wherein:
the minimum distance from the circular arc platform to the top of the convex hull is equal to or greater than the width between the upper side wall and the lower side wall of the circular arc platform.
8. The new centrifugal fan volute of claim 1, wherein:
the total height of the boss and the convex hull is h1The impeller comprises a disk cover, and the height of the disk cover is h2，0.6<h1：h2<1.2。
9. The new centrifugal fan volute of claim 6, wherein:
the boss and the convex hull are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922228650.2U CN211144907U (en) | 2019-12-12 | 2019-12-12 | Novel centrifugal fan volute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922228650.2U CN211144907U (en) | 2019-12-12 | 2019-12-12 | Novel centrifugal fan volute |
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| Publication Number | Publication Date |
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| CN211144907U true CN211144907U (en) | 2020-07-31 |
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| CN201922228650.2U Active CN211144907U (en) | 2019-12-12 | 2019-12-12 | Novel centrifugal fan volute |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114396392A (en) * | 2021-12-17 | 2022-04-26 | 广东美的白色家电技术创新中心有限公司 | Volute assembly, centrifugal fan and range hood |
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2019
- 2019-12-12 CN CN201922228650.2U patent/CN211144907U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114396392A (en) * | 2021-12-17 | 2022-04-26 | 广东美的白色家电技术创新中心有限公司 | Volute assembly, centrifugal fan and range hood |
| CN114396392B (en) * | 2021-12-17 | 2024-04-26 | 广东美的白色家电技术创新中心有限公司 | Volute component, centrifugal fan and range hood |
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