CN114707262A - 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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- CN114707262A CN114707262A CN202210289837.7A CN202210289837A CN114707262A CN 114707262 A CN114707262 A CN 114707262A CN 202210289837 A CN202210289837 A CN 202210289837A CN 114707262 A CN114707262 A CN 114707262A
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- 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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a centrifugal fan, a centrifugal wind wheel and a design method of a noise reduction blade of the centrifugal wind wheel. 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 circle 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 arc line and the arc length of the first arc line on the first auxiliary line. And then making a second auxiliary line and determining the circle center of the second arc line and the arc length of the second arc line on the second auxiliary line. At the moment, a first blade single-side contour line which is used for being matched with the blade contour can be formed by tangency of the first arc line and the second arc line, a second blade single-side contour line can be obtained by translation of the first blade single-side contour line, and the blade contour is finally formed.
Description
Technical Field
The invention relates to the technical field of centrifugal fans, in particular to a centrifugal fan, a centrifugal wind wheel and a design method of a noise reduction blade of the centrifugal wind wheel.
Background
In a traditional centrifugal fan, an adopted wind wheel is generally in a single arc line blade type, and meanwhile, in order to ensure the air output of the centrifugal fan, the sum of the angles of a blade outlet installation angle and a blade inlet installation angle also needs to meet the design requirement. For the practical application of household products, such as air conditioners, air purifiers and other products, the low noise must be considered on the premise of ensuring the air volume. 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 noise reduction blade for a centrifugal fan and a centrifugal wind wheel, aiming at the problem that the conventional blade cannot effectively reduce noise.
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 the 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 center of the wind wheel disc; a first auxiliary line and a fourth auxiliary line are made 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; making a first arc line with a fourth auxiliary radius, wherein the circle center of the first arc line is on the first auxiliary line, and the first arc line passes through the intersection point of the vertical central line of the wind wheel disc and the periphery of the wind wheel disc and is tangent to the fourth auxiliary line; a second auxiliary line is made at the intersection of the first arc line and the first auxiliary circle, and the second auxiliary line penetrates through the circle center of the first arc line; making a second arc line, wherein the circle center of the second arc line is positioned on the second auxiliary line, the second arc line is tangent to the first arc line, and the intersection position of the second arc line and the second auxiliary line is the terminal point of the second arc line; the first arc line and the second arc line are matched to form a first blade single-side contour line, the first blade single-side contour line is arranged along the periphery of the wind wheel disc in a translation preset distance to form a second blade single-side contour line, and the first blade single-side contour line and the second blade single-side contour line are matched to form a blade contour line.
A centrifugal wind wheel adopts a design method of the noise reduction blade of the centrifugal wind wheel.
A centrifugal fan adopts the noise reduction blade of the centrifugal wind wheel.
In one embodiment, in the step of forming a first auxiliary line at an intersection of a vertical center line of the wind wheel disc and the outer periphery of the wind wheel disc, the first auxiliary line has a first preset included angle with the vertical center line of the wind wheel disc, the first auxiliary line is located on the left side of the vertical center line of the wind wheel disc, a third auxiliary line is formed at an intersection of the vertical center line of the wind wheel disc and the outer periphery of the wind wheel disc, the third auxiliary line is located on the right side of the vertical center line of the wind wheel disc, and the third auxiliary line has 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 outer 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 drawn along the end point of the second arc line, and the fifth auxiliary line is tangent to the second arc line; and a sixth auxiliary line is made at the intersection point of the second circular arc line and the second auxiliary circle, the sixth auxiliary line is tangent 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 circle angle shearing on one end of the first blade single-side profile line far away from the wind wheel disc and one end of the second blade single-side profile line far away from the wind wheel disc.
In one embodiment, a plurality of blade profiles are arranged on the circumferential side wall of the wind wheel disc at intervals, and the number of the blade profiles is 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, firstly, the design radius of the wind wheel disc is determined, then, the circle 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 arc line and the arc length of the first arc line on the first auxiliary line. And then making a second auxiliary line and determining the circle center of the second arc line and the arc length of the second arc line on the second auxiliary line. At the moment, a first blade single-side contour line which is used for being matched with the blade contour can be formed by tangency of the first arc line and the second arc line, a second blade single-side contour line can be obtained by translation of the first blade single-side contour line, and the blade contour is finally formed. According to the design method of the noise reduction blade of the centrifugal wind wheel, the double-arc blade profile design is realized by utilizing the first arc line and the second arc line, so that the wind noise of the fan can be effectively reduced.
The centrifugal wind wheel adopts a design method of the noise reduction blades of the centrifugal wind wheel, namely, the design radius of the wind wheel disc is firstly determined, then, the circle 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 arc line and the arc length of the first arc line on the first auxiliary line. And then making a second auxiliary line and determining the circle center of the second arc line and the arc length of the second arc line on the second auxiliary line. At the moment, a first blade single-side contour line adapted to the blade profile can be formed by tangency of the first arc line and the second arc line, a second blade single-side contour line can be obtained by translation of the first blade single-side contour line, and the blade profile is finally formed. The blades of making an uproar are fallen with centrifugal wind wheel and are installed in the blade profile correspondingly to make centrifugal wind wheel realize the design of biarc line blade profile, can effectively reduce fan wind and make an uproar.
Above-mentioned centrifugal fan uses above-mentioned centrifugal wind wheel, just can form through first circular arc line and the tangent first blade unilateral contour line that just can be used for suiting with the blade profile in the wind wheel dish to and just can obtain second blade unilateral contour line through first blade unilateral contour line translation, finally form the blade profile. The design method of the noise reduction blade of the centrifugal wind wheel realizes the double-arc blade profile design by utilizing the first arc line and the second arc line, so that the noise reduction blade of the centrifugal wind wheel realizes the double-arc blade profile design. The centrifugal fan can effectively reduce the wind noise of the fan.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a design method of a noise reduction blade of a centrifugal wind turbine;
fig. 2 is a schematic structural view of a centrifugal wind wheel.
100. The wind wheel disc comprises a wind wheel disc body 101, a first auxiliary circle 102, a second auxiliary circle 103, a first auxiliary line 104, a first preset included angle 110, a first arc line 111, a second auxiliary line 112, a fourth auxiliary line 113, a first line included angle 120, a second arc line 121, a fifth auxiliary line 122, a sixth auxiliary line 130, a first blade single-side contour line 140, a second blade single-side contour line 150, a blade contour line 160, a third auxiliary line 161, a second preset included angle 200 and the centrifugal wind wheel noise reduction blade.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" 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. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
Referring to fig. 1 and 2, in one embodiment, a method for designing a noise reduction blade 200 of a centrifugal wind turbine includes: determining the design radius of the wind wheel disc 100; forming a first auxiliary circle 101 with a first auxiliary diameter and a second auxiliary circle 102 with a second auxiliary diameter at the center of the wind wheel disc 100; a first auxiliary line 103 and a fourth auxiliary line 112 are made 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 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 a tangent line of the periphery of the wind wheel disc 100 passing through the intersection point generate a first line included angle 113; making a first arc line 110 with a fourth auxiliary radius, wherein the center of the first arc line 110 is on the first auxiliary line 103, and the first 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 made at the intersection of the first arc line 110 and the first auxiliary circle 101, and the second auxiliary line 111 passes through the center of the first arc line 110; making a second arc line 120, wherein the center of the second arc line 120 is on the second auxiliary line 111, the second arc line 120 is tangent to the first arc line 110, and the intersection position of the second arc line 120 and the second auxiliary circle 102 is the end point of the second arc line 120; the first circular arc line 110 and the second circular arc line 120 are matched 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 disc 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 are matched 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 circle 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. A first auxiliary line 103 is drawn, and the center of the first arc line 110 and the arc length of the first arc line 110 are determined on the first auxiliary line 103. And then, making a second auxiliary line 111 and determining the circle 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 one-side contour line 130 for conforming to the blade contour 150 can be formed by the first arc line 110 being tangent to the second arc line 120, and the second blade one-side contour line 140 can be obtained by the first blade one-side contour line 130 being translated, and the blade contour 150 can be finally formed. According to the design method of the noise reduction blade 200 of the centrifugal wind wheel, the first arc line 110 and the second arc line 120 are utilized to realize double-arc blade profile design, so that the wind noise of the fan can be effectively reduced.
In one embodiment, as shown in fig. 1, in the step of forming a first auxiliary line 103 at the intersection of the vertical center line of the wind wheel disc 100 and the outer periphery of the wind wheel disc 100, the first auxiliary line 103 having a first preset included angle 104 with the vertical center line of the wind wheel disc 100, the first auxiliary line 103 being located on the left side of the vertical center line of the wind wheel disc 100, and forming a third auxiliary line 160 at the intersection of the vertical center line of the wind wheel disc 100 and the outer periphery of the wind wheel disc 100, the third auxiliary line 160 being located on the right side of the vertical center line of the wind wheel disc 100, and the third auxiliary line 160 having a second preset included angle 161 with the vertical center line of the wind wheel disc 100. Specifically, the position of the center of the first arc line 110 can be more conveniently determined by drawing the first auxiliary line 103 and the third auxiliary line 160, so that the drawing accuracy of the first arc line 110 is ensured. Further, the first auxiliary line 103 and the third auxiliary line 160 are located on two sides of the vertical center line of the wind wheel disc 100, and the degree of the first preset included angle 104 is within an angle tolerance of ± 0.2 of 12 °. The degree of the second predetermined included angle 161 is a 15 ° angular tolerance ± 0.2 °.
In one embodiment, as shown in fig. 1, a fourth auxiliary line 112 is made at an intersection of the outer periphery of the wind wheel disc 100 and the first arc line 110, the fourth auxiliary line 112 is tangent to the first arc line 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 included angle 113, and the first included angle 113 is an air outlet installation angle. A fourth auxiliary line 112 is drawn at an intersection of the outer periphery of the wind wheel disc 100 and the first arc line 110, the fourth auxiliary line 112 is tangent to the first arc line 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 included angle 113, and the first included angle 113 is an air outlet installation angle. Specifically, the fourth auxiliary line 112 is made in the above manner, and the fourth auxiliary line 112 is parallel to the horizontal center line of the wind turbine disc 100, so that the angle error of the first included angle 113 made on the fourth auxiliary line 112 can be reduced. Further, the angle of the first line included angle 113, that is, the angle of the air outlet installation angle, can be determined without affecting the radian of the first arc line 110.
In one embodiment, as shown in fig. 1, a fifth auxiliary line 121 is drawn along an end point of the second arc line 120, and the fifth auxiliary line 121 is tangent to the second arc line 120; a sixth auxiliary line 122 is formed at an intersection of the second arc line 120 and the second auxiliary circle 102, the sixth auxiliary line 122 is tangent 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 made in the above manner, and an included angle formed by the fifth auxiliary line 121 and the sixth auxiliary line 122 is used as an air inlet installation angle. At the moment, the sum of the angles of the air inlet mounting angle and the air outlet mounting angle can reach an angle tolerance of 88 degrees +/-0.2 degrees, so that the air output of the air wheel disc 100 can be effectively ensured.
Referring to fig. 1 and 2, in one embodiment, the blade profile 150 is generated by performing a circle-corner shear on an end of the first blade single-side profile line 130 away from the wind turbine disk 100 and an end of the second blade single-side profile line 140 away from the wind turbine disk 100. Specifically, the above described approach enables a complete, closed profile to be formed corresponding to the blade by subjecting the first blade single-side profile to a circular angular shearing of the second blade single-side profile, such that the blade is more accurate when installed in the blade profile 150.
In one embodiment, a plurality of the blade profiles 150 are spaced along the circumferential sidewall of the wind turbine disk 100, and the number of the blade profiles 150 is an odd number. The number of the blade profiles 150 is 41-49. Specifically, above-mentioned mode has realized the interval arrangement of a plurality of blades along wind wheel dish 100 circumference, and guarantee that blade profile 150 books are odd number, can more effectual assurance wind wheel dish 100 air output, and reduce the blade export, the air current flows out with higher speed between the blade, can reduce the vortex loss at the blade direction of rotation back, the fan efficiency under certain rotational speed has been guaranteed, also can reduce the vortex noise of this part simultaneously, make wind wheel dish 100 wind sound more smooth-going, reduce the abnormal sound.
In one embodiment, a centrifugal wind turbine is provided, which employs the design method of the noise reduction blades 200 of the centrifugal wind turbine.
The centrifugal wind wheel adopts a design method of the noise reduction blades 200 of the centrifugal wind wheel, namely, the design radius of the wind wheel disc 100 is firstly 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. A first auxiliary line 103 is drawn, and the center of the first arc line 110 and the arc length of the first arc line 110 are determined on the first auxiliary line 103. And then, making a second auxiliary line 111 and determining the circle 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 one-side contour line 130 for conforming to the blade contour 150 can be formed by the first arc line 110 being tangent to the second arc line 120, and the second blade one-side contour line 140 can be obtained by the first blade one-side contour line 130 being translated, and the blade contour 150 can be finally formed. The noise reduction blades 200 of the centrifugal wind wheel are correspondingly arranged in the blade outline 150, so that the centrifugal wind wheel realizes the double-arc blade profile design, and the wind noise of the fan can be effectively reduced.
In one embodiment, a centrifugal wind turbine is provided that employs the centrifugal wind turbine noise reduction blades 200.
The centrifugal fan uses the centrifugal wind wheel, a first blade single-side contour line 130 adapted to the blade contour 150 can be formed in the wind wheel disc 100 by the first arc line 110 being tangent to the second arc line 120, a second blade single-side contour line 140 can be obtained by the first blade single-side contour line 130 being translated, and the blade contour 150 is finally formed. That is, the design of the double-arc blade profile is realized by using the first arc line 110 and the second arc line 120 through the design method of the centrifugal wind wheel noise reduction blade 200, so that the double-arc blade profile design of the centrifugal wind wheel noise reduction blade 200 is realized. The centrifugal fan can effectively reduce fan wind noise.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A design method of a noise reduction blade of a centrifugal wind wheel is characterized by comprising the following steps:
determining the 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 center of the wind wheel disc;
a first auxiliary line and a fourth auxiliary line are made 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 included angle;
making a first arc line with a fourth auxiliary radius, wherein the circle center of the first arc line is on the first auxiliary line, and the first arc line passes through the intersection point of the vertical central line of the wind wheel disc and the periphery of the wind wheel disc and is tangent to the fourth auxiliary line;
a second auxiliary line is made at the intersection of the first arc line and the first auxiliary circle, and the second auxiliary line penetrates through the circle center of the first arc line;
making a second arc line, wherein the circle center of the second arc line is on the second auxiliary line, the second arc line is tangent to the first arc line, and the intersection position of the second arc line and the second auxiliary circle is the terminal point of the second arc line;
first circular arc line with the cooperation of second circular arc line forms first blade unilateral contour line, will first blade unilateral contour line follows the periphery translation of wind wheel dish is predetermine the distance and is formed second blade unilateral contour line, first blade unilateral contour line with the cooperation of second blade unilateral contour line forms the blade profile.
2. The method of designing a centrifugal wind wheel noise reduction blade according to claim 1, wherein in the step of making a first auxiliary line at an intersection of a vertical center line of the wind wheel disc and the outer periphery of the wind wheel disc, the first auxiliary line having a first predetermined included angle with the vertical center line of the wind wheel disc, the first auxiliary line is positioned on the left side of the vertical center line of the wind wheel disc, and a third auxiliary line is made at an intersection of the vertical center line of the wind wheel disc and the outer periphery of the wind wheel disc, the third auxiliary line being positioned on the right side of the vertical center line of the wind wheel disc, the third auxiliary line having a second predetermined included angle with the vertical center line of the wind wheel disc.
3. The method of designing a centrifugal wind wheel noise reduction blade according to claim 1, wherein a fourth auxiliary line is made at an intersection of the outer periphery of the wind wheel disc and the first circular arc line, the fourth auxiliary line being tangent to the first circular arc line and being parallel to a horizontal center line of the wind wheel disc.
4. The design method of a centrifugal wind wheel noise reduction blade according to claim 1, wherein the first line angle is an outlet wind setting angle.
5. The design method of the noise reduction blade for the centrifugal wind turbine according to claim 4, wherein a fifth auxiliary line is drawn along the end point of the second arc line, and the fifth auxiliary line is tangent to the second arc line; and a sixth auxiliary line is made at the intersection point of the second arc line and the second auxiliary circle, the sixth auxiliary line is tangent 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 design method of the noise reduction blade of the centrifugal wind wheel according to claim 1, wherein the blade profile is generated by performing circle angle shearing on one end of the first blade single-side profile line far away from the wind wheel disc and one end of the second blade single-side profile line far away from the wind wheel disc.
7. The method of designing a noise reducing rotor blade for a centrifugal wind rotor according to claim 1, wherein a plurality of the blade profiles are provided at intervals along a circumferential sidewall of the rotor disk, and the blade profiles are provided in an odd number.
8. A method of designing a centrifugal wind rotor noise reduction blade according to claim 7, wherein the number of blade profiles is 41-49.
9. A centrifugal wind rotor, characterized in that the design method of the noise reduction blades of the centrifugal wind rotor according to any one of claims 1 to 8 is adopted.
10. A centrifugal fan characterized by the use of a centrifugal wind wheel noise reduction blade according to claim 9.
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 |
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| 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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| Publication Number | Publication Date |
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| CN114707262A true CN114707262A (en) | 2022-07-05 |
| CN114707262B CN114707262B (en) | 2023-08-18 |
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| CN202210289837.7A Active 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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| 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 |
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| 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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| CN114707262B (en) | 2023-08-18 |
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