CN220505410U - Fan and cleaning device applying same - Google Patents
Fan and cleaning device applying same Download PDFInfo
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- CN220505410U CN220505410U CN202321924431.8U CN202321924431U CN220505410U CN 220505410 U CN220505410 U CN 220505410U CN 202321924431 U CN202321924431 U CN 202321924431U CN 220505410 U CN220505410 U CN 220505410U
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- guide vane
- beta
- fan
- vane
- blower
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- 238000004140 cleaning Methods 0.000 title claims abstract description 14
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a fan and a cleaning device using the same, wherein the fan comprises a shell, a movable impeller, a stationary blade and a guide blade are sequentially arranged in the shell from upstream to downstream along a gas flow path, and the outlet end of the guide blade is in a sawtooth structure. Compared with the prior art, the utility model has the advantages that: through setting up the sawtooth structure, can reduce fan stator afterbody vortex intensity, cut apart the big whirlpool that jets out into little whirlpool, radial continuity weakens, accelerates the whirlpool dissipation, reduces vortex noise.
Description
Technical Field
The utility model relates to a power device, in particular to a fan and a cleaning device using the fan.
Background
Cleaning devices, such as floor washers, floor sweeping robots, etc., are becoming cleaning tools for people's daily lives. The working principle of the floor washing machine is as follows: the inlet creates a large vacuum (static pressure greater than 4.5 kpa) to draw in the mixture of water and waste and to separate the waste by impact in the waste tank, so the medium needs to overcome a large flow resistance. The fan needs to have a large vacuum degree in a small design size space, the air quantity is larger than 0.6m3/min, and the efficiency is larger than 50% so as to ensure high endurance. This can present significant challenges and difficulties in the design of fans.
The technical scheme of the fan of the common cleaning device is as follows: 1. the technical scheme is gradually eliminated in the floor cleaning machine by adopting a backward centrifugal impeller (movable impeller) combined with a vaneless diffuser and being commonly used for floor cleaning robots, and is characterized by low inlet vacuum degree and efficiency, high noise and poor sound quality; 2. the advantages of low impeller cost, high efficiency and low noise are increasingly applied in industry due to the small size of the technical proposal of combining the backward centrifugal impeller (movable impeller) with the guide vane type.
With the development of technology, the requirements of the cleaning device on noise are higher and higher, and the fan is used as a main power system and is a main source for generating noise. The working rotation speed of the fan is 65000-75000 rpm, and the sound pressure level of the noise is 70-85 dB. Pneumatic noise is its primary source. The existing high-speed fan of the floor washing machine has the following problems: 1) The rotating speed of the fan is high, the air flow speed is high, and the total sound pressure level of pneumatic noise is high; 2) The rotating speed of the fan is high, radial pressure pulsation in the fan is easy to cause vibration noise, and sound pressure at the fundamental frequency n/60 is high; 3) In the high-speed fan frequency spectrum, compared with other frequency bands, the leaf frequency nZ/60 has obvious peak values, so that the fan hearing has obvious abnormal sound and uncomfortable feeling.
In order to reduce noise, a guide vane is usually arranged in the high-speed fan, and the main functions of the guide vane are as follows: 1) The rotational flow generated by the airflow converted into axial airflow through the centrifugal impeller is eliminated, and the vortex noise is reduced; 2) And the speed and the pressure are reduced and the full pressure and the efficiency are improved. 3) Noise spectrum distribution is made, and sound quality is improved.
The existing guide vane design for the high-speed fan of the floor washer adopts the spiral arrangement of space guide vanes as disclosed in Chinese patent with the application number of 202020732306.7, so that the effects of stabilizing flow and reducing noise are achieved; as further disclosed in application number 201920080158.2, the use of a blade pitch arrangement includes: the guide vane comprises an arc-shaped front plate, an arc-shaped rear plate opposite to the arc-shaped front plate and a straight plate connecting the arc-shaped front plate and the arc-shaped rear plate, so that when air flow passes through the guide vane, the flow of the air flow can be guided through the arc-shaped front plate and the arc-shaped rear plate, the air flow is prevented from forming vortex in the fixed vane wheel, the vortex noise generated by the falling of the air flow is reduced, and the flow loss is reduced; as disclosed in the chinese patent with application No. 2017203234633. X, the guide vanes are arranged in a circumferentially non-uniform distribution manner, so that aerodynamic noise is reduced, and the performance of the fan is less affected.
However, the above prior art has the following problems: 1) Optimizing the aerodynamic parameter design of the movable and static blades can only optimize the total sound pressure level of fan noise, but cannot control the frequency spectrum of the noise, so that the sound quality is improved; 2) The air flow noise generated by the periodic interference of the movable blade and the static blade is a common problem of the fan and cannot be eliminated by optimizing the aerodynamic parameters of the guide vane.
Disclosure of Invention
The first technical problem to be solved by the utility model is to provide a fan for reducing vortex noise aiming at the defects existing in the prior art.
The second technical problem to be solved by the utility model is to provide a cleaning device with the fan.
The technical scheme adopted by the utility model for solving the first technical problem is as follows: the utility model provides a fan, includes the casing, along the gas flow path, from the upper reaches to downstream have set gradually movable vane wheel, stator and stator in the casing, its characterized in that:
the outlet end of the guide vane is in a sawtooth structure.
Through setting up the sawtooth structure, can reduce fan stator afterbody vortex intensity, cut apart the big whirlpool that jets out into little whirlpool, radial continuity weakens, accelerates the whirlpool dissipation, reduces vortex noise.
Preferably, the tooth shape of the sawtooth structure is triangular, sinusoidal or circular arc.
Preferably, the teeth of the sawtooth structureIs triangular, and the tooth width of the sawtooth structure is d 1 And satisfy d 1 ＝(0.13～0.2)d 0 Wherein d is 0 Is the radial width of the vane. Thereby facilitating machining while increasing the density of teeth so that the eddy currents are cut less and the eddy current noise less.
Further, the inlet mounting angle of the guide vane is beta s 2 The outlet mounting angle of the guide vane is beta s 3 And meet beta s 2 The range of the value of (2) is 70-85 degrees, and beta s is 3 The range of the value of the flow is 85-90 degrees, so that the speed of the airflow flowing out of the front-end movable vane 2 and the stationary vane 3 is reduced, and the noise of the airflow is reduced.
Further, the air duct formed between the adjacent guide vanes is a diffusion type air duct, so that the speed and pressure reducing and boosting effects can be achieved, and the pneumatic impact noise is reduced.
Further, the number of the blades of the guide vane is 1.5-1.9 times of that of the guide vane, so that periodic vortex generated by dynamic and static interference can be weakened to be extruded and dissipated, and the effect of reducing the sound pressure level of the blade frequency is achieved.
Further, the vane has a cascade density of τ and satisfiesAnd b is the chord length of the molded line of the guide vanes, and t is the distance between two adjacent guide vanes, so that the airflow flowing out of the upper-stage stationary vanes can be rectified and dissipated to reduce the strength of vortex, reduce the radial pressure pulsation, and further play a role in vibration reduction.
Further, the inlet mounting angle of the guide vane is beta s 2 The outlet mounting angle of the guide vane is beta s 3 And meet beta s 2 The range of the value of (2) is 70-85 degrees, and beta s is 3 The value range of the vane is 85-90 degrees, the number of the vanes is 1.5-1.9 times of that of the vanes, the cascade density of the vanes is tau, and the vane meets the requirements ofWhere b is the chord length of the profile of the vane and t is the spacing between two adjacent vanesThe blade frequency peak value of the fan can be effectively reduced or eliminated, the sound quality of the fan is obviously improved, and the air performance of the fan is not lost.
Further, the axial height of the stator blade is L 1 The axial height of the guide vane is H 1 And meet H 1 ＝0.4～0.5L 1 . Since the stator blade 3 is mainly used for restricting the fluidity of the gas and improving the flow efficiency, and the guide blade 4 is mainly used for rectifying and reducing noise, in order to ensure better flow performance, the axial height of the stator blade 3 is required to be ensured as much as possible under the condition of limited space.
The utility model solves the second technical problem by adopting the technical proposal that: a cleaning device, characterized in that: the fan as described above is applied.
Compared with the prior art, the utility model has the advantages that: by arranging the sawtooth structure at the outlet end of the guide vane, the tail vortex strength of the guide vane of the fan can be reduced, the ejected large vortex is divided into small vortices, the radial continuity is weakened, the vortex dissipation is accelerated, and the vortex noise is reduced; through the design of the inlet and outlet mounting angles, the number of blades and the cascade density of the guide vanes, the blade frequency peak value of the fan can be effectively reduced or eliminated, the sound quality of the fan is obviously improved, and the air performance of the fan is not lost; by combining the diffusion type air duct and the sawtooth structure, the vortex strength in the guide vane air duct is weakened, and vibration generated during working is reduced, so that fundamental frequency noise is reduced; the guide vane has good manufacturability, simple installation and low processing and installation cost.
Drawings
FIG. 1 is a schematic diagram of a blower in accordance with an embodiment of the present utility model;
FIG. 2 is a schematic view of a fan hidden housing according to an embodiment of the present utility model;
FIG. 3 is a schematic view of a vane and mounting portion of a wind turbine in accordance with an embodiment of the present utility model;
FIG. 4 is a cross-sectional view of FIG. 3;
FIG. 5 is an enlarged schematic view of portion I of FIG. 4;
FIG. 6 is a geometric schematic of a vane cascade of a wind turbine in accordance with an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present utility model may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.
Referring to fig. 1 to 6, a fan is mainly used for cleaning devices, such as a floor scrubber, a floor sweeping robot, and the like, and comprises a housing 1, wherein a movable impeller 2, a stationary blade 3 and a guide blade 4 are arranged in the housing 1, the movable impeller 2 is positioned at the most upstream, the guide blade 4 is positioned at the most downstream along a gas flow path, and the stationary blade 3 is positioned between the movable impeller 2 and the guide blade 4. The structure is the structure of a fan existing in the field.
Inlet mounting angle ss of guide vane 4 2 The size is the outlet installation angle of the upper-stage stationary blade 3, and beta s is generally taken 2 =70° to 85 °. Outlet mounting angle ss of guide vane 4 3 By reducing the velocity of the airflow flowing out of the front-end movable vane 2 and the stationary vane 3, airflow noise is reduced. The air channel formed between adjacent guide vanes 4 is diffusion typeTherefore, the device can play a role in decelerating and boosting, and reduce pneumatic impact noise.
The number of blades of the guide vane 4 is 1.5-1.9 times of that of the upper-stage stationary vane 3, so that periodic vortex generated by dynamic and static interference can be weakened to be extruded and dissipated, and the effect of reducing the sound pressure level of the blade frequency is achieved. Density of cascadeWherein b is the chord length of the molded line of the guide vanes 4, and t is the interval between two adjacent guide vanes 4, so that the airflow flowing out of the upper-stage stationary vanes can be rectified and dissipated to reduce the strength of vortex, reduce the radial pressure pulsation, and further play a role in vibration reduction.
The axial height of the stator blade 3 is L 1 The axial height of the guide vane 4 is H 1 And meet H 1 ＝0.4～0.5L 1 . Since the stator blade 3 is mainly used for restricting the fluidity of the gas and improving the flow efficiency, and the guide blade 4 is mainly used for rectifying and reducing noise, in order to ensure better flow performance, the axial height of the stator blade 3 is required to be ensured as much as possible under the condition of limited space.
The outlet end of the guide vane 4 is in a sawtooth structure 41, and the tooth shape of the sawtooth structure 41 can be in a triangular structure, sinusoidal distribution, circular arc shape and the like. The function of the sawtooth structure 41 is to reduce the tail vortex strength of the fan guide vane, divide the ejected large vortex into small vortices, weaken radial continuity, accelerate vortex dissipation and reduce vortex noise. Preferably, in the present embodiment, the tooth shape of the sawtooth structure 41 is triangular, and the tooth height lambda 1 = (0.1-0.3) b, tooth width d 1 ＝(0.13～0.2)d 0 Wherein d is 0 For the radial width of the guide vane 4, the tooth widths may be uniformly distributed along the radial height of the guide vane 4 or may be unevenly distributed.
Claims (10)
1. The utility model provides a fan, includes casing (1), along gas flow path, movable vane wheel (2), stator blade (3) and stator blade (4) have set gradually from the upper reaches to the low reaches in casing (1), its characterized in that:
the outlet end of the guide vane (4) is in a sawtooth structure (41).
2. The blower of claim 1, wherein: the tooth shape of the sawtooth structure (41) is triangular, sinusoidal or circular arc.
3. The blower of claim 2, wherein: the tooth shape of the sawtooth structure (41) is triangular, and the tooth width of the sawtooth structure (41) is d 1 And satisfy d 1 ＝(0.13～0.2)d 0 Wherein d is 0 Is the radial width of the guide vane (4).
4. The blower of claim 1, wherein: the inlet mounting angle of the guide vane (4) is beta s 2 The outlet mounting angle of the guide vane (4) is beta s 3 And meet beta s 2 The range of the value of (2) is 70-85 degrees, and beta s is 3 The range of the value of (2) is 85-90 degrees.
5. The blower of claim 1, wherein: the air channel formed between the adjacent guide vanes (4) is a diffusion type air channel.
6. The blower of claim 1, wherein: the number of blades of the guide vane (4) is 1.5-1.9 times that of the guide vane (3).
7. The blower of claim 1, wherein: the vane (4) has a cascade density of tau and satisfiesWherein b is the chord length of the profile of the guide vane (4), and t is the spacing between two adjacent guide vanes (4).
8. The blower of claim 1, wherein: the inlet mounting angle of the guide vane (4) is beta s 2 The outlet mounting angle of the guide vane (4) is beta s 3 And meet beta s 2 The range of the value of (2) is 70-85 degrees, and beta s is 3 Is of the value of (2)The range is 85-90 degrees, the number of blades of the guide vane (4) is 1.5-1.9 times of that of the stator vane (3), the cascade density of the guide vane (4) is tau, and the requirement is metWherein b is the chord length of the profile of the guide vane (4), and t is the spacing between two adjacent guide vanes (4).
9. The blower of claim 1, wherein: the axial height of the stator blade (3) is L 1 The axial height of the guide vane (4) is H 1 And meet H 1 ＝0.4～0.5L 1 。
10. A cleaning device, characterized in that: use of a fan according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321924431.8U CN220505410U (en) | 2023-07-20 | 2023-07-20 | Fan and cleaning device applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321924431.8U CN220505410U (en) | 2023-07-20 | 2023-07-20 | Fan and cleaning device applying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220505410U true CN220505410U (en) | 2024-02-20 |
Family
ID=89874400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321924431.8U Active CN220505410U (en) | 2023-07-20 | 2023-07-20 | Fan and cleaning device applying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220505410U (en) |
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2023
- 2023-07-20 CN CN202321924431.8U patent/CN220505410U/en active Active
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