CN114707262B - Centrifugal fan, centrifugal wind wheel and design method of noise reduction blade of centrifugal wind wheel - Google Patents
Centrifugal fan, centrifugal wind wheel and design method of noise reduction blade of centrifugal wind wheel Download PDFInfo
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- CN114707262B CN114707262B CN202210289837.7A CN202210289837A CN114707262B CN 114707262 B CN114707262 B CN 114707262B CN 202210289837 A CN202210289837 A CN 202210289837A CN 114707262 B CN114707262 B CN 114707262B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The application relates to a centrifugal fan, a centrifugal wind wheel and a centrifugal wind wheel noise reduction blade design method. When the design method of the noise reduction blade of the centrifugal wind wheel is used, the design radius of the wind wheel disc is firstly determined, then, the center of the wind wheel disc is used as two auxiliary circles, namely a first auxiliary circle with a first auxiliary diameter and a second auxiliary circle with a second auxiliary diameter, and the first auxiliary circle, the second auxiliary circle and the wind wheel disc are concentric. And making a first auxiliary line, and determining the circle center of the first circular arc line and the circular arc length of the first circular arc line on the first auxiliary line. And then the second auxiliary line is used for determining the circle center of the second circular arc line and the arc length of the second circular arc line. At this time, the first arc line and the second arc line are tangent to form a first blade single-side contour line which is suitable for the blade contour, and the first blade single-side contour line is translated to obtain a second blade single-side contour line, so that the blade contour is finally formed.
Description
Technical Field
The application relates to the technical field of centrifugal fans, in particular to a centrifugal fan, a centrifugal wind wheel and a centrifugal wind wheel noise reduction blade design method.
Background
In a traditional centrifugal fan, the adopted wind wheel is generally of a single-arc blade type, and in order to ensure the air output of the centrifugal fan, the sum of the angles of the blade outlet mounting angle and the blade inlet mounting angle also needs to meet the design requirement. In practical applications of household products such as air conditioners, air purifiers and the like, low noise must be considered on the premise of ensuring air quantity. However, conventional blades used in conventional centrifugal fans do not achieve effective noise reduction indoors.
Disclosure of Invention
Based on this, it is necessary to provide a centrifugal fan and a noise reduction blade for a centrifugal wind wheel, which solve the problem that the conventional blade cannot realize effective noise reduction.
A noise reduction blade of a centrifugal wind wheel. The design method of the noise reduction blade of the centrifugal wind wheel comprises the following steps: determining a design radius of the wind wheel disc; forming a first auxiliary circle with a first auxiliary diameter and a second auxiliary circle with a second auxiliary diameter by using the circle center of the wind wheel disc; a first auxiliary line and a fourth auxiliary line are arranged at the intersection point of the vertical central line of the wind wheel disc and the periphery of the wind wheel disc, the first auxiliary line and the vertical central line of the wind wheel disc have a first preset included angle, and the fourth auxiliary line and a tangent line of the periphery of the wind wheel disc passing through the intersection point generate a first line; a first circular arc line with a fourth auxiliary radius is formed, the center of the first circular arc line is arranged on the first auxiliary line, and the first circular arc line is tangent to the fourth auxiliary line at the intersection point of the vertical center line of the wind wheel disc and the periphery of the wind wheel disc; a second auxiliary line is arranged at the intersection point of the first circular arc line and the first auxiliary circle, and the second auxiliary line passes through the circle center of the first circular arc line; a second circular arc line is made, the center of the second circular arc line is positioned on the second auxiliary line, the second circular arc line is tangent with the first circular arc line, and the intersection position of the second circular arc line and the second auxiliary line is the end point of the second circular arc line; the first arc line is matched with the second arc line to form a first blade unilateral contour line, the first blade unilateral contour line is translated along the periphery of the wind wheel disc by a preset distance to form a second blade unilateral contour line, and the first blade unilateral contour line is matched with the second blade unilateral contour line to form a blade contour.
A centrifugal wind wheel adopts the design method of the noise reduction blade of the centrifugal wind wheel.
A centrifugal fan adopts the centrifugal wind wheel noise reduction blade.
In one embodiment, a first auxiliary line is made at the intersection point of the vertical center line of the wind wheel disc and the periphery of the wind wheel disc, and in the step of forming a first preset included angle with the vertical center line of the wind wheel disc, the first auxiliary line is located at the left side of the vertical center line of the wind wheel disc, a third auxiliary line is made at the intersection point of the vertical center line of the wind wheel disc and the periphery of the wind wheel disc, and the third auxiliary line is located at the right side of the vertical center line of the wind wheel disc, and forms a second preset included angle with the vertical center line of the wind wheel disc.
In one embodiment, a fourth auxiliary line is made at the intersection point of the periphery of the wind wheel disc and the first circular arc line, the fourth auxiliary line is tangent to the first circular arc line, and the fourth auxiliary line is parallel to the horizontal center line of the wind wheel disc.
In one embodiment, the fourth auxiliary line is used as a first line included angle, and the first line included angle is an air outlet installation angle.
In one embodiment, a fifth auxiliary line is made at the end point along the second circular arc line, and the fifth auxiliary line is tangent to the second circular arc line; and a sixth auxiliary line is arranged at the intersection point of the second circular arc line and the second auxiliary circle, the sixth auxiliary line is tangential to the second auxiliary circle, and an included angle formed by the fifth auxiliary line and the sixth auxiliary line is an air inlet installation angle.
In one embodiment, the blade profile is generated by performing a circular angle cut at an end of the first blade single side profile line away from the wind turbine disc and an end of the second blade single side profile line away from the wind turbine disc.
In one embodiment, a plurality of the blade profiles are arranged at intervals along the circumferential side wall of the wind turbine disc, and the blade profiles are odd.
In one embodiment, the number of blade profiles is 41-49.
When the design method of the noise reduction blade of the centrifugal wind wheel is used, the design radius of the wind wheel disc is firstly determined, then, the center of the wind wheel disc is used as two auxiliary circles, namely a first auxiliary circle with a first auxiliary diameter and a second auxiliary circle with a second auxiliary diameter, and the first auxiliary circle, the second auxiliary circle and the wind wheel disc are concentric. And making a first auxiliary line, and determining the circle center of the first circular arc line and the circular arc length of the first circular arc line on the first auxiliary line. And then the second auxiliary line is used for determining the circle center of the second circular arc line and the arc length of the second circular arc line. At this time, the first arc line and the second arc line are tangent to form a first blade single-side contour line which is suitable for the blade contour, and the first blade single-side contour line is translated to obtain a second blade single-side contour line, so that the blade contour is finally formed. The design method of the centrifugal wind wheel noise reduction blade realizes double-arc blade profile design by utilizing the first arc line and the second arc line, thereby effectively reducing wind noise of a fan.
The centrifugal wind wheel adopts a design method of the centrifugal wind wheel noise reduction blade, namely, the design radius of the wind wheel disc is firstly determined, then, the center of the wind wheel disc is used as two auxiliary circles, namely, a first auxiliary circle with a first auxiliary diameter and a second auxiliary circle with a second auxiliary diameter, and the first auxiliary circle, the second auxiliary circle and the wind wheel disc are concentric. And making a first auxiliary line, and determining the circle center of the first circular arc line and the circular arc length of the first circular arc line on the first auxiliary line. And then the second auxiliary line is used for determining the circle center of the second circular arc line and the arc length of the second circular arc line. At this time, the first arc line and the second arc line are tangent to form a first blade single-side contour line which is suitable for the blade contour, and the first blade single-side contour line is translated to obtain a second blade single-side contour line, so that the blade contour is finally formed. The centrifugal wind wheel noise reduction blades are correspondingly arranged in the blade profile, so that the centrifugal wind wheel realizes double-arc blade profile design, and the wind noise of a fan can be effectively reduced.
The centrifugal fan uses the centrifugal wind wheel, a first blade unilateral contour line which is used for adapting to the blade contour can be formed in the wind wheel disc through the tangency of the first circular arc line and the second circular arc line, and a second blade unilateral contour line can be obtained through the translation of the first blade unilateral contour line, and finally the blade contour is formed. The centrifugal wind wheel noise reduction blade is designed by utilizing the first circular arc line and the second circular arc line, so that the centrifugal wind wheel noise reduction blade is designed by utilizing the double-arc line. Namely, the centrifugal fan can effectively reduce fan wind noise.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a method of designing a noise reduction blade for a centrifugal wind turbine;
fig. 2 is a schematic structural view of a centrifugal wind wheel.
100. The fan wheel disc, 101, a first auxiliary circle, 102, a second auxiliary circle, 103, a first auxiliary line, 104, a first preset included angle, 110, a first circular arc line, 111, a second auxiliary line, 112, a fourth auxiliary line, 113, a first line included angle, 120, a second circular arc line, 121, a fifth auxiliary line, 122, a sixth auxiliary line, 130, a first blade unilateral profile line, 140, a second blade unilateral profile line, 150, a blade profile, 160, a third auxiliary line, 161, a second preset included angle, 200 and a centrifugal fan noise reduction blade.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, 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 convenience in describing the present application 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 therefore should not be construed as limiting the present application.
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 at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to fig. 1 and fig. 2, in one embodiment, a method for designing a noise reduction blade 200 of a centrifugal wind wheel includes: determining a design radius of the wind turbine disc 100; forming a first auxiliary circle 101 with a first auxiliary diameter and a second auxiliary circle 102 with a second auxiliary diameter by using the circle center of the wind wheel disc 100; a first auxiliary line 103 and a fourth auxiliary line 112 are formed at the intersection point of the vertical center line of the wind wheel disc 100 and the periphery of the wind wheel disc 100, wherein the first auxiliary line 103 and the vertical center line of the wind wheel disc 100 have a first preset included angle 104, and the fourth auxiliary line 112 and the periphery tangent line of the wind wheel disc 100 passing through the intersection point generate a first included angle 113; a first circular arc line 110 with a fourth auxiliary radius is formed, the center of the first circular arc line 110 is arranged on the first auxiliary line 103, and the first circular arc line 110 passes through the intersection point of the vertical center line of the wind wheel disc 100 and the periphery of the wind wheel disc 100; a second auxiliary line 111 is formed at the intersection point of the first circular arc line 110 and the first auxiliary circle 101, and the second auxiliary line 111 passes through the center of the first circular arc line 110; a second circular arc line 120 is made, the center of the second circular arc line 120 is on the second auxiliary line 111, the second circular arc line 120 is tangent to the first circular arc line 110, and the intersection position of the second circular arc line 120 and the second auxiliary circle 102 is the end point of the second circular arc line 120; the first arc line 110 and the second arc line 120 cooperate to form a first blade single-side contour line 130, the first blade single-side contour line 130 is translated along the periphery of the wind wheel 100 by a preset distance to form a second blade single-side contour line 140, and the first blade single-side contour line 130 and the second blade single-side contour line 140 cooperate to form a blade contour 150.
When the design method of the noise reduction blade of the centrifugal wind wheel is used, firstly, the design radius of the wind wheel disc 100 is determined, then, the center of the wind wheel disc 100 is used as three auxiliary circles, namely a first auxiliary circle 101 with a first auxiliary diameter and a second auxiliary circle 102 with a second auxiliary diameter, and the first auxiliary circle 101, the second auxiliary circle 102 and the wind wheel disc 100 are concentric. The first auxiliary line 103 is made and the center of the first circular arc line 110 and the circular arc length of the first circular arc line 110 are determined on the first auxiliary line 103. The second auxiliary line 111 is then used to determine the center of the second arc line 120 and the arc length of the second arc line 120 on the second auxiliary line 111. At this time, the first blade single-side contour line 130 for adapting to the blade contour 150 can be formed by the tangency of the first camber line 110 and the second camber line 120, and the second blade single-side contour line 140 can be obtained by the translation of the first blade single-side contour line 130, finally forming the blade contour 150. The design method of the centrifugal wind wheel noise reduction blade 200 realizes double-arc blade profile design by utilizing the first arc line 110 and the second arc line 120, so that wind noise of a fan can be effectively reduced.
In an embodiment, as shown in fig. 1, a first auxiliary line 103 is formed at the intersection point of the vertical center line of the wind wheel disc 100 and the periphery of the wind wheel disc 100, in the step that the first auxiliary line 103 has a first preset included angle 104 with the vertical center line of the wind wheel disc 100, the first auxiliary line 103 is located at the left side of the vertical center line of the wind wheel disc 100, a third auxiliary line 160 is formed at the intersection point of the vertical center line of the wind wheel disc 100 and the periphery of the wind wheel disc 100, the third auxiliary line 160 is located at the right side of the vertical center line of the wind wheel disc 100, and the third auxiliary line 160 has a second preset included angle 161 with the vertical center line of the wind wheel disc 100. Specifically, the center position of the first circular arc line 110 can be more conveniently determined by making the first auxiliary line 103 and the third auxiliary line 160, thereby ensuring the drawing precision of the first circular arc line 110. Further, the first auxiliary line 103 and the third auxiliary line 160 are located at two sides of the vertical center line of the wind turbine disc 100, and the degree of the first preset included angle 104 is 12 ° angular tolerance±0.2. The degree of the second preset included angle 161 is 15 ° angular tolerance±0.2°.
As shown in connection with fig. 1, in one embodiment, a fourth auxiliary line 112 is provided at the intersection of the outer periphery of the wind turbine disc 100 and the first circular arc 110, the fourth auxiliary line 112 is tangential to the first circular arc 110, and the fourth auxiliary line 112 is parallel to the horizontal center line of the wind turbine disc 100. The fourth auxiliary line 112 is used as a first line angle 113, and the first line angle 113 is an air outlet installation angle. A fourth auxiliary line 112 is formed at the intersection point of the outer periphery of the wind wheel disc 100 and the first circular arc 110, the fourth auxiliary line 112 is tangent to the first circular arc 110, and the fourth auxiliary line 112 is parallel to the horizontal center line of the wind wheel disc 100. The fourth auxiliary line 112 is used as a first line angle 113, and the first line angle 113 is an air outlet installation angle. Specifically, by making the fourth auxiliary line 112 in the above manner, and the fourth auxiliary line 112 is parallel to the horizontal center line of the wind turbine rotor disc 100, the angle error of the first line included angle 113 made on the fourth auxiliary line 112 can be reduced. Further, the angle of the first line angle 113, i.e. the angle of the wind installation angle, may be determined without guaranteeing that the radian of the first circular arc 110 is not affected.
Referring to fig. 1, in one embodiment, a fifth auxiliary line 121 is disposed at the end of the second circular arc 120, and the fifth auxiliary line 121 is tangential to the second circular arc 120; a sixth auxiliary line 122 is formed at the intersection point of the second circular arc line 120 and the second auxiliary circle 102, the sixth auxiliary line 122 is tangential to the second auxiliary circle 102, and an included angle formed by the fifth auxiliary line 121 and the sixth auxiliary line 122 is an air inlet installation angle. Specifically, the fifth auxiliary line 121 and the sixth auxiliary line 122 are formed in the above manner, and the included angle formed by the fifth auxiliary line 121 and the sixth auxiliary line 122 is the air inlet installation angle. At this time, the sum of the angles of the air inlet installation angle and the air outlet installation angle can reach 88 degrees of angle tolerance + -0.2 degrees, so that the air outlet quantity of the air turbine disc 100 can be effectively ensured.
As shown in connection with fig. 1 and 2, in one embodiment, a circular angle cut is made at an end of the first blade single side contour 130 remote from the rotor disk 100 and an end of the second blade single side contour 140 remote from the rotor disk 100 to generate the blade contour 150. Specifically, the above manner enables the blade to be formed into a complete, closed profile corresponding to the blade by performing the rounded angle shearing on the first blade single side profile and the second blade single side profile, so that the blade is more accurate when being fitted into the blade profile 150.
In one embodiment, a plurality of the blade profiles 150 are disposed at intervals along the circumferential side wall of the wind wheel 100, and the blade profiles 150 are odd. The number of blade profiles 150 is 41-49. Specifically, the above-mentioned mode has realized that a plurality of blades are along the interval arrangement of wind wheel 100 circumference, and guarantee that blade profile 150 book is odd, can more effectual assurance wind wheel 100's air-out volume to and reduce the blade export, the air current flows out with higher speed between the blade, can reduce the eddy current loss at blade rotation direction back, guaranteed the fan efficiency under certain rotational speed, also can reduce the eddy current noise of this part simultaneously, make wind wheel 100 wind sound smoother, reduce the abnormal sound.
In one embodiment, a centrifugal wind wheel adopts the design method of the noise reduction blade 200 of the centrifugal wind wheel.
The centrifugal wind wheel adopts the design method of the centrifugal wind wheel noise reduction blade 200, namely, firstly, the design radius of the wind wheel disc 100 is determined, then, the center of the wind wheel disc 100 is used as two auxiliary circles, namely, a first auxiliary circle 101 with a first auxiliary diameter and a second auxiliary circle 102 with a second auxiliary diameter, and the first auxiliary circle 101, the second auxiliary circle 102 and the wind wheel disc 100 are concentric. The first auxiliary line 103 is made and the center of the first circular arc line 110 and the circular arc length of the first circular arc line 110 are determined on the first auxiliary line 103. The second auxiliary line 111 is then used to determine the center of the second arc line 120 and the arc length of the second arc line 120 on the second auxiliary line 111. At this time, the first blade single-side contour line 130 for adapting to the blade contour 150 can be formed by the tangency of the first camber line 110 and the second camber line 120, and the second blade single-side contour line 140 can be obtained by the translation of the first blade single-side contour line 130, finally forming the blade contour 150. The centrifugal wind wheel noise reduction blade 200 is correspondingly arranged in the blade profile 150, so that the centrifugal wind wheel realizes double-arc blade profile design, and the wind noise of a fan can be effectively reduced.
In one embodiment, a centrifugal fan employs the centrifugal rotor noise reduction blade 200.
The centrifugal fan uses the centrifugal wind wheel, a first blade unilateral contour line 130 which is used for adapting to a blade contour 150 can be formed in the wind wheel 100 through the tangency of the first circular arc line 110 and the second circular arc line 120, and a second blade unilateral contour line 140 can be obtained through the translation of the first blade unilateral contour line 130, and finally the blade contour 150 is formed. That is, the centrifugal wind wheel noise reduction blade 200 is designed by using the first circular arc line 110 and the second circular arc line 120, thereby realizing the double-arc line blade profile design. Namely, the centrifugal fan can effectively reduce fan wind noise.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The design method of the noise reduction blade of the centrifugal wind wheel is characterized by comprising the following steps of:
determining a design radius of the wind wheel disc;
forming a first auxiliary circle with a first auxiliary diameter and a second auxiliary circle with a second auxiliary diameter by using the circle center of the wind wheel disc;
a first auxiliary line and a fourth auxiliary line are arranged at the intersection point of the vertical central line of the wind wheel disc and the periphery of the wind wheel disc, the first auxiliary line and the vertical central line of the wind wheel disc have a first preset included angle, and the fourth auxiliary line and the periphery tangent line of the wind wheel disc passing through the intersection point generate a first included angle;
a first circular arc line with a fourth auxiliary radius is formed, the center of the first circular arc line is arranged on the first auxiliary line, and the first circular arc line is tangent to the fourth auxiliary line at the intersection point of the vertical center line of the wind wheel disc and the periphery of the wind wheel disc;
a second auxiliary line is arranged at the intersection point of the first circular arc line and the first auxiliary circle, and the second auxiliary line passes through the circle center of the first circular arc line;
a second circular arc line is made, the center of the second circular arc line is positioned on the second auxiliary line, the second circular arc line is tangent with the first circular arc line, and the intersection position of the second circular arc line and the second auxiliary line is the end point of the second circular arc line;
the first arc line is matched with the second arc line to form a first blade unilateral contour line, the first blade unilateral contour line is translated along the periphery of the wind wheel disc by a preset distance to form a second blade unilateral contour line, and the first blade unilateral contour line is matched with the second blade unilateral contour line to form a blade contour.
2. The method of designing a centrifugal wind turbine noise reduction blade according to claim 1, wherein a first auxiliary line is provided at an intersection point of a vertical center line of the wind turbine disk and a periphery of the wind turbine disk, the first auxiliary line is provided at a left side of the vertical center line of the wind turbine disk in the step of providing a first preset angle with the vertical center line of the wind turbine disk, a third auxiliary line is provided at an intersection point of the vertical center line of the wind turbine disk and the periphery of the wind turbine disk, the third auxiliary line is provided at a right side of the vertical center line of the wind turbine disk, and the third auxiliary line is provided at a second preset angle with the vertical center line of the wind turbine disk.
3. The method of designing a centrifugal wind turbine noise reduction blade according to claim 1, wherein a fourth auxiliary line is made at an intersection of the periphery of the wind turbine disk and the first circular arc line, the fourth auxiliary line is tangent to the first circular arc line, and the fourth auxiliary line is parallel to a horizontal center line of the wind turbine disk.
4. The method of designing a centrifugal wind turbine noise reduction blade according to claim 1, wherein the first line angle is an air outlet mounting angle.
5. The method of designing a centrifugal wind turbine noise reduction blade according to claim 4, wherein a fifth auxiliary line is made at the end point of the second circular arc line, and the fifth auxiliary line is tangent to the second circular arc line; and a sixth auxiliary line is arranged at the intersection point of the second circular arc line and the second auxiliary circle, the sixth auxiliary line is tangential to the second auxiliary circle, and an included angle formed by the fifth auxiliary line and the sixth auxiliary line is an air inlet installation angle.
6. The method of designing a centrifugal wind turbine noise reduction blade according to claim 1, wherein the blade profile is generated by performing a circular angle shear on an end of the first blade single-side profile line away from the wind wheel disc and an end of the second blade single-side profile line away from the wind wheel disc.
7. The method of designing a centrifugal wind turbine noise reduction blade according to claim 1, wherein a plurality of the blade profiles are provided at intervals along the circumferential side wall of the wind turbine disk, and the blade profiles are odd.
8. The method for designing the centrifugal wind wheel noise reduction blade according to claim 7, wherein the number of the blade profiles is 41-49.
9. A centrifugal wind wheel, characterized in that a design method of a centrifugal wind wheel noise reduction blade according to any one of claims 1 to 8 is adopted.
10. A centrifugal fan, wherein the centrifugal wind wheel of claim 9 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210289837.7A CN114707262B (en) | 2022-03-23 | 2022-03-23 | Centrifugal fan, centrifugal wind wheel and design method of noise reduction blade of centrifugal wind wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210289837.7A CN114707262B (en) | 2022-03-23 | 2022-03-23 | Centrifugal fan, centrifugal wind wheel and design method of noise reduction blade of centrifugal wind wheel |
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| CN108268672A (en) * | 2016-12-30 | 2018-07-10 | 格朗吉斯铝业（上海）有限公司 | Aerofoil fan, design aerofoil fan three dimendional blade method and computer equipment |
| CN208634100U (en) * | 2018-08-16 | 2019-03-22 | 沈阳盛纳机械制造有限公司 | A kind of multi sphere section centrifugal fan blade |
| CN110617239A (en) * | 2019-10-14 | 2019-12-27 | 尚科宁家(中国)科技有限公司 | Dust collector impeller and dust collector |
| CN212868011U (en) * | 2020-08-25 | 2021-04-02 | 中山市高途五金制品有限公司 | Wind wheel |
| CN215109658U (en) * | 2021-02-09 | 2021-12-10 | 日本电产株式会社 | Impeller and air supply device |
| CN114370428A (en) * | 2022-01-27 | 2022-04-19 | 杭州老板电器股份有限公司 | Fan blade and centrifugal fan |
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| CN205956063U (en) * | 2016-08-23 | 2017-02-15 | 佛山市南海九洲普惠风机有限公司 | High -efficient silence impeller with it is antecurvature |
| CN108268672A (en) * | 2016-12-30 | 2018-07-10 | 格朗吉斯铝业（上海）有限公司 | Aerofoil fan, design aerofoil fan three dimendional blade method and computer equipment |
| CN208634100U (en) * | 2018-08-16 | 2019-03-22 | 沈阳盛纳机械制造有限公司 | A kind of multi sphere section centrifugal fan blade |
| CN110617239A (en) * | 2019-10-14 | 2019-12-27 | 尚科宁家(中国)科技有限公司 | Dust collector impeller and dust collector |
| CN212868011U (en) * | 2020-08-25 | 2021-04-02 | 中山市高途五金制品有限公司 | Wind wheel |
| CN215109658U (en) * | 2021-02-09 | 2021-12-10 | 日本电产株式会社 | Impeller and air supply device |
| CN114370428A (en) * | 2022-01-27 | 2022-04-19 | 杭州老板电器股份有限公司 | Fan blade and centrifugal fan |
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| CN114707262A (en) | 2022-07-05 |
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