CN219282077U - Backward centrifugal fan - Google Patents
Backward centrifugal fan Download PDFInfo
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- CN219282077U CN219282077U CN202320257345.XU CN202320257345U CN219282077U CN 219282077 U CN219282077 U CN 219282077U CN 202320257345 U CN202320257345 U CN 202320257345U CN 219282077 U CN219282077 U CN 219282077U
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- cover plate
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Abstract
The utility model discloses a backward centrifugal fan, which comprises a centrifugal wind wheel, a volute and a driver, wherein the centrifugal wind wheel is arranged in the volute; the centrifugal wind wheel comprises a front cover plate, a rear cover plate and a plurality of blades, wherein the front cover plate is connected to the rear cover plate through the plurality of blades, the rear cover plate is located below the front cover plate, the rear cover plate comprises a central installation part and a circular ring part, the central installation part outwards extends to form the circular ring part, the driving end of the driver is connected to the central installation part, the surface of the circular ring part is an arc surface, an outwards extending line of a connecting line between two endpoints of the arc surface and an outwards extending line of an outer side edge of the front cover plate form an included angle alpha, and the connecting line between two endpoints of the arc surface and a horizontal line form an included angle beta. The method solves the problem that the size of the fan is continuously increased by increasing the size of the conventional centrifugal fan in the radial direction and the axial direction to increase the functional force of the fan.
Description
Technical Field
The utility model relates to the technical field of cleaning equipment, in particular to a backward centrifugal fan.
Background
Along with development of science and technology, various automatic cleaning devices such as an automatic floor sweeping robot, an automatic floor mopping robot and the like appear, but along with the increasing requirements of people on cleaning capability of the cleaning devices, namely the requirement on suction capability of a fan assembly is higher and higher, noise can be improved only by improving the rotating speed of the fan and the vacuum degree of the fan assembly, and the size requirement on the fan assembly is smaller and smaller for more functions of the cleaning devices, so that the size of a fan is continuously increased by a method of increasing the size of a conventional centrifugal fan in radial and axial directions to increase the functional capability of the fan.
Disclosure of Invention
The utility model provides a backward centrifugal fan aiming at overcoming the defects, and aims to solve the problem that the size of a fan is continuously increased by increasing the size of a conventional centrifugal fan in the radial direction and the axial direction to increase the functional force of the fan.
To achieve the purpose, the utility model adopts the following technical scheme:
the rear centrifugal fan comprises a centrifugal wind wheel, a volute and a driver, wherein the centrifugal wind wheel is arranged in the volute, the driver is arranged below the centrifugal wind wheel, an air inlet is formed in the top of the volute, and an air outlet is formed in the outer side face of the volute;
the centrifugal wind wheel comprises a front cover plate, a rear cover plate and a plurality of blades, wherein the front cover plate is connected with the rear cover plate through a plurality of blades, the rear cover plate is positioned below the front cover plate, the rear cover plate comprises a central installation part and a circular ring part, the central installation part outwards extends to form the circular ring part, the driving end of the driver is connected with the central installation part, the surface of the circular ring part is a cambered surface, an outwards extending line of a connecting line between two endpoints of the cambered surface and an outwards extending line of an outer side edge of the front cover plate form an included angle alpha, and a connecting line between two endpoints of the cambered surface and a horizontal line form an included angle beta.
Preferably, the scroll casing comprises an upper scroll casing and a lower scroll casing, and the lower end of the upper scroll casing is detachably mounted at the upper end of the lower scroll casing.
Preferably, a plurality of said blades are evenly distributed in the circumferential direction.
Preferably, the rear cover plate is provided with a plurality of mounting holes, and a plurality of mounting holes are uniformly distributed along the circumferential direction.
Preferably, an included angle alpha is formed between an outward extension line of a connecting line between two endpoints of the cambered surface and an outward extension line of the outer side edge of the front cover plate, and is more than or equal to 0 degrees and less than or equal to 15 degrees; the included angle beta between the connecting line between the two endpoints of the cambered surface and the horizontal line is 0 degrees and less than 20 degrees.
Preferably, when the surface of the circular ring part of the rear cover plate is a plane, the height of the air outlet is H1; when the surface of the circular ring part of the rear cover plate is a cambered surface, the height of the air outlet is H2; and satisfies (H2-H1). Ltoreq.R.tan.alpha, wherein R is the radius of the centrifugal wind wheel, alpha is the included angle formed by the outward extension line of the connecting line between the two endpoints of the cambered surface and the outward extension line of the outer side edge of the front cover plate, and alpha is more than or equal to 0 and less than or equal to 15 degrees.
The technical scheme provided by the embodiment of the application can comprise the following beneficial effects:
in the scheme, the surface of the circular ring part of the rear cover plate is designed to be the cambered surface, compared with the conventional plane design of the surface of the circular ring part of the rear cover plate, the height of the blade can be increased, the working area of the blade can be increased, and the working capacity of the backward centrifugal fan can be improved under the condition that the radial and axial dimensions of the backward centrifugal fan are not changed.
Drawings
FIG. 1 is a schematic diagram of a backward centrifugal fan;
FIG. 2 is a side view of a backward centrifugal blower;
FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 2;
FIG. 4 is a top view of one embodiment of the present utility model;
FIG. 5 is a cross-sectional view of one embodiment of the present utility model;
fig. 6 is a cross-sectional view of one embodiment of the present utility model.
1, a centrifugal wind wheel; 2. a volute; 3. a driver; 4. an air inlet; 5. an air outlet; 11. a front cover plate; 12. a back cover plate; 13. a blade; 21. an upper volute; 22. a lower volute; 120. a mounting hole; 121. a center mounting portion; 122. a circular ring portion; 1220. a cambered surface; an included angle is formed between the outward extension line of the connecting line between the two endpoints of the alpha and the cambered surface and the outward extension line of the outer side edge of the front cover plate; an included angle is formed between a connecting line between two endpoints of the beta and the cambered surface and a horizontal line; h1, the height of the air outlet when the surface of the circular ring part of the rear cover plate is a plane; h2, the height of the air outlet when the surface of the circular ring part of the rear cover plate is a cambered surface.
Detailed Description
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
In the description of the present utility model, it should be understood that the terms "length," "middle," "upper," "lower," "left," "right," "top," "bottom," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "spliced," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The rear centrifugal fan comprises a centrifugal wind wheel 1, a volute 2 and a driver 3, wherein the centrifugal wind wheel 1 is arranged in the volute 2, the driver 3 is arranged below the centrifugal wind wheel 1, an air inlet 4 is formed in the top of the volute 2, and an air outlet 5 is formed in the outer side face of the volute 2;
the centrifugal wind wheel 1 comprises a front cover plate 11, a rear cover plate 12 and a plurality of blades 13, wherein the front cover plate 11 is connected to the rear cover plate 12 through the blades 13, the rear cover plate 12 is positioned below the front cover plate 11, the rear cover plate 12 comprises a central mounting portion 121 and a circular ring portion 122, the central mounting portion 121 extends outwards to form the circular ring portion 122, the driving end of the driver 3 is connected to the central mounting portion 121, the surface of the circular ring portion 122 is an arc surface 1220, an included angle alpha is formed between an outward extension line of a connecting line between two end points of the arc surface 1220 and an outward extension line of an outer side edge of the front cover plate 11, and an included angle beta is formed between a connecting line between two end points of the arc surface 1220 and a horizontal line.
In this scheme, as shown in fig. 1-3, the driver 3 in this embodiment is a motor, and by starting the driver 3, the centrifugal wind wheel 1 is driven to rotate at a high speed, so that external air enters the volute 2 through the air inlet 4 and is discharged through the air outlet 5. The surface of the annular part 122 of the rear cover plate 12 of the conventional backward centrifugal fan is a plane, the surface of the annular part 122 of the scheme is an arc surface 1220, an included angle alpha is formed between the outward extension line of the connecting line between two end points of the arc surface 1220 and the outward extension line of the outer side edge of the front cover plate 11, and an included angle beta is formed between the connecting line between two end points of the arc surface 1220 and a horizontal line, and the front cover plate 11 is connected to the rear cover plate 12 through a plurality of blades 13, so that the height of the blades 13 can be increased, the work area of the blades 13 is increased, and the work capability of the backward centrifugal fan is improved. In this scheme, the increase of the height of blade 13 is favorable to making the increase of the height of air outlet 5 can form the accelerating air current, makes backward centrifugal fan can be applicable to the operating mode of low-flow atmospheric pressure.
In this solution, by designing the surface of the annular portion 122 of the back cover plate 12 as the arc surface 1220, compared with the conventional planar design of the surface of the annular portion 122 of the back cover plate 12, the height of the blade 13 can be increased, which is beneficial to increasing the working area of the blade 13, and improving the working capacity of the backward centrifugal fan under the condition of not changing the radial and axial dimensions of the backward centrifugal fan.
Preferably, the scroll casing 2 includes an upper scroll casing 21 and a lower scroll casing 22, and a lower end of the upper scroll casing 21 is detachably mounted to an upper end of the lower scroll casing 22. In this embodiment, as shown in fig. 1, since the lower end of the upper volute 21 is connected to the upper end of the lower volute 22, the disassembly of the volute 2 is facilitated, and the replacement of the centrifugal wind wheel 1 is facilitated.
Preferably, a plurality of said blades 13 are uniformly distributed in the circumferential direction. In this embodiment, as shown in fig. 2, since the plurality of blades 13 are uniformly distributed along the circumferential direction, it is beneficial to ensure that the air output of the backward centrifugal fan is uniform during the rotation of the centrifugal wind wheel 1.
Preferably, the back cover 12 is provided with a plurality of mounting holes 120, and the plurality of mounting holes 120 are uniformly distributed along the circumferential direction. In this embodiment, as shown in fig. 4, 3 mounting holes 120 are provided, and the driver 3 is mounted to the 3 mounting holes 120 of the back cover 120, so that the driver 3 is mounted more stably.
Preferably, an angle alpha formed by the outward extension line of the connecting line between the two end points of the cambered surface 1220 and the outward extension line of the outer side edge of the front cover plate 11 is more than or equal to 0 degrees and less than or equal to 15 degrees; the line between the two end points of the arc 1220 forms an angle beta with the horizontal line of 0 DEG < beta < 20 deg. In this embodiment, as shown in fig. 2-3, the included angle α is 15 °, and the included angle β is 15 °. The provision of the included angle α and the included angle β is advantageous in increasing the height of the blades 13, increasing the height of the air outlet 5, and forming an accelerated air flow.
Preferably, when the surface of the annular portion 122 of the back cover 12 is a plane, the height of the air outlet 5 is H1; when the surface of the annular portion 122 of the rear cover plate 12 is an arc surface, the height of the air outlet 5 is H2; and satisfies (H2-H1). Ltoreq.R.tan. Alpha, wherein R is the radius of the centrifugal wind wheel 1, alpha is the angle formed by the outward extension line of the connecting line between the two endpoints of the cambered surface 1220 and the outward extension line of the outer side edge of the front cover plate, and alpha is more than or equal to 0 and less than or equal to 15 degrees.
In an embodiment, as shown in fig. 5-6, when the centrifugal wind wheel 1 has the same height, and the surface of the annular portion 122 of the back cover plate 12 is designed to be a plane, the height H1 of the air outlet 5 is 5mm, in this embodiment, when the surface of the annular portion 122 of the back cover plate 12 is a cambered surface, the height H2 of the air outlet 5 is 6mm, and H2 is greater than H1, so as to achieve the purpose of increasing the working area of the blade 13.
The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (6)
1. The utility model provides a backward centrifugal fan which characterized in that: the centrifugal wind wheel is arranged in the volute, the driver is arranged below the centrifugal wind wheel, an air inlet is formed in the top of the volute, and an air outlet is formed in the outer side face of the volute;
the centrifugal wind wheel comprises a front cover plate, a rear cover plate and a plurality of blades, wherein the front cover plate is connected with the rear cover plate through a plurality of blades, the rear cover plate is positioned below the front cover plate, the rear cover plate comprises a central installation part and a circular ring part, the central installation part outwards extends to form the circular ring part, the driving end of the driver is connected with the central installation part, the surface of the circular ring part is a cambered surface, an outwards extending line of a connecting line between two endpoints of the cambered surface and an outwards extending line of an outer side edge of the front cover plate form an included angle alpha, and a connecting line between two endpoints of the cambered surface and a horizontal line form an included angle beta.
2. A backward centrifugal fan as set forth in claim 1, wherein: the spiral case includes spiral case and lower spiral case, the lower extreme of going up the spiral case detachably install in the upper end of lower spiral case.
3. A backward centrifugal fan as set forth in claim 1, wherein: and a plurality of blades are uniformly distributed along the circumferential direction.
4. A backward centrifugal fan as set forth in claim 1, wherein: the back cover plate is provided with a plurality of mounting holes, and a plurality of mounting holes are uniformly distributed along the circumferential direction.
5. A backward centrifugal fan as set forth in claim 1, wherein: an included angle alpha is more than or equal to 0 degrees and less than or equal to 15 degrees, formed by an outward extension line of a connecting line between two endpoints of the cambered surface and an outward extension line of the outer side edge of the front cover plate; the included angle beta between the connecting line between the two endpoints of the cambered surface and the horizontal line is 0 degrees and less than 20 degrees.
6. A backward centrifugal fan as set forth in claim 1, wherein: when the surface of the circular ring part of the rear cover plate is a plane, the height of the air outlet is H1; when the surface of the circular ring part of the rear cover plate is a cambered surface, the height of the air outlet is H2; and satisfies (H2-H1). Ltoreq.R.tan.alpha, wherein R is the radius of the centrifugal wind wheel, alpha is the included angle formed by the outward extension line of the connecting line between the two endpoints of the cambered surface and the outward extension line of the outer side edge of the front cover plate, and alpha is more than or equal to 0 and less than or equal to 15 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320257345.XU CN219282077U (en) | 2023-02-20 | 2023-02-20 | Backward centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320257345.XU CN219282077U (en) | 2023-02-20 | 2023-02-20 | Backward centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219282077U true CN219282077U (en) | 2023-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320257345.XU Active CN219282077U (en) | 2023-02-20 | 2023-02-20 | Backward centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219282077U (en) |
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2023
- 2023-02-20 CN CN202320257345.XU patent/CN219282077U/en active Active
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