CN116066404A - Noise reduction type centrifugal fan blade and air conditioner - Google Patents

Noise reduction type centrifugal fan blade and air conditioner Download PDF

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Publication number
CN116066404A
CN116066404A CN202111293729.9A CN202111293729A CN116066404A CN 116066404 A CN116066404 A CN 116066404A CN 202111293729 A CN202111293729 A CN 202111293729A CN 116066404 A CN116066404 A CN 116066404A
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China
Prior art keywords
fan blade
edge side
centrifugal fan
noise
air
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CN202111293729.9A
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Chinese (zh)
Inventor
李颖颖
杜伟
柯得军
苏闯
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Priority to CN202111293729.9A priority Critical patent/CN116066404A/en
Publication of CN116066404A publication Critical patent/CN116066404A/en
Pending legal-status Critical Current

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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
    • 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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • 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
    • F04D29/663—Sound attenuation
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a noise reduction type centrifugal fan blade and an air conditioner, and relates to the technical field of air conditioners. The noise-reducing centrifugal fan blade comprises fan blades. The fan blade is provided with a flange side, a front edge side, a concave edge side and a rear edge side which are connected end to end, the cross section of the concave edge side is arc-shaped, and the cross section of the flange side is a fitting curve formed by sequentially connecting three sections of curves. Compared with the prior art, the noise-reducing centrifugal fan blade provided by the invention has the advantages that due to the adoption of the concave edge side arranged in the arc shape and the flange side arranged in the fitting curve, noise generated during air outlet can be reduced, the comfort level of a user is improved, the air quantity loss is reduced, the air outlet quantity is increased, and the air outlet efficiency is improved.

Description

Noise reduction type centrifugal fan blade and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a noise reduction type centrifugal fan blade and an air conditioner.
Background
At present, in the application of an air conditioner, a centrifugal fan is generally utilized to drive air to flow so as to form an air outlet flow, and then a heat exchanger is utilized to exchange heat for the air outlet flow so as to realize the heating or refrigerating function. Most of centrifugal fan blades in the conventional centrifugal fan adopt a multi-wing forward mode, and the fan blades have equal thickness along the chord length direction or have no change rule, so that in the air outlet process of the centrifugal fan, the centrifugal fan blades rotate at a high speed, so that the pressure pulsation of surrounding air can be caused, the air pressure acts on a volute part to form noise, the comfort level of a user is reduced, certain air quantity loss can be caused, and the air outlet efficiency is low.
Disclosure of Invention
The invention solves the problems of reducing noise generated during air outlet, improving user comfort, reducing air loss, increasing air outlet and improving air outlet efficiency.
In order to solve the problems, the technical scheme of the invention is realized as follows:
in a first aspect, the invention provides a noise reduction type centrifugal fan blade, which comprises a fan blade, wherein the fan blade is provided with a flange side, a front edge side, a concave edge side and a rear edge side which are connected end to end, the cross section of the concave edge side is arc-shaped, the cross section of the flange side is a fitting curve formed by sequentially connecting three sections of curves, and the function relationship of the fitting curve is as follows:
Figure BDA0003335652930000011
the unit of x is millimeter, the x-axis direction is the direction from the front edge side to the rear edge side on the connecting line of the two ends of the mean camber line of the fan blade, the y-axis direction is the direction perpendicular to the x-axis and from the concave edge side to the flange side, and the origin is the intersection point of the mean camber line of the fan blade and the front edge side. Compared with the prior art, the noise-reducing centrifugal fan blade provided by the invention has the advantages that due to the adoption of the concave edge side arranged in the arc shape and the flange side arranged in the fitting curve, noise generated during air outlet can be reduced, the comfort level of a user is improved, the air quantity loss is reduced, the air outlet quantity is increased, and the air outlet efficiency is improved.
Further, when x=4.45, the distance between the concave edge side and the convex edge side is the largest, and the thickness of the fan blade is the largest. The thickness of the fan blade is gradually increased and then gradually reduced in the x-axis direction, so that the air flow flowing through the fan blade is outwards diffused to the two sides of the fan blade, and then the air flow approaches to each other along the concave edge side and the flange side, thereby reducing air resistance and improving air outlet efficiency.
Further, the noise reduction type centrifugal fan blade further comprises a fixed ring, the rear edge side of the fan blade is connected with the fixed ring, the number of the fan blades is multiple, and the fan blades are annularly arranged in the fixed ring in an array mode. The fan blades cooperate to drive air to flow to form air-out air flow.
Further, the number of fan blades ranges from 42 to 45. The reasonable number of the fan blades can ensure the air output and simultaneously reduce the generated noise as much as possible.
Further, an inlet installation angle is formed between a circle which takes the middle point of the fixed ring as the center of a circle and passes through the origin and the camber line of the fan blade, and the range of the inlet installation angle is 65-75 degrees. The reasonable inlet mounting angle can effectively improve the static pressure ratio and isentropic efficiency of the fan blade while guaranteeing the air output.
Further, an outlet mounting angle is formed between a circle taking the midpoint of the fixed ring as the center of a circle and passing through the intersection point of the fan blade mean camber line and the trailing edge side and the fan blade mean camber line, and the range of the outlet mounting angle is 160-175 degrees. The reasonable outlet installation angle can effectively increase the air output, improve the air output efficiency and reduce the generated noise.
Further, the difference between the outlet mounting angle and the inlet mounting angle ranges from 90 degrees to 105 degrees. The reasonable difference between the outlet installation angle and the inlet installation angle can reduce the generated noise as much as possible while guaranteeing the air outlet effect, and is convenient for processing the noise-reducing centrifugal fan blade.
Further, the ratio of the diameter of the circle centered on the midpoint of the stationary ring and passing through the origin to the outer diameter of the stationary ring ranges from 0.78 to 0.85. The reasonable wheel diameter ratio can increase the air output, improve the air output efficiency and reduce the generated noise.
Further, the cross section of the front edge side is arc-shaped, and the radius of the arc of the front edge side ranges from 0.5 mm to 0.7 mm. The reasonable radius of the arc on the front edge side can ensure the air guiding effect and reduce the air resistance to the maximum extent.
In a second aspect, the invention provides an air conditioner, comprising the noise-reducing centrifugal fan blade, the noise-reducing centrifugal fan blade comprises a fan blade, the fan blade is provided with a flange side, a front edge side, a concave edge side and a rear edge side which are connected end to end, the cross section of the concave edge side is arc-shaped, the cross section of the flange side is a fitting curve formed by sequentially connecting three sections of curves, and the function relationship of the fitting curve is as follows:
Figure BDA0003335652930000031
the unit of x is millimeter, the x-axis direction is the direction from the front edge side to the rear edge side on the connecting line of the two ends of the mean camber line of the fan blade, the y-axis direction is the direction perpendicular to the x-axis and from the concave edge side to the flange side, and the origin is the intersection point of the mean camber line of the fan blade and the front edge side. The air conditioner can reduce noise generated during air outlet, improve user comfort, reduce air loss, increase air outlet and improve air outlet efficiency.
Drawings
FIG. 1 is a front view of a noise reduction type centrifugal fan blade according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a connection between a fan blade and a stationary ring in a noise reduction type centrifugal fan blade according to a first embodiment of the present invention;
FIG. 3 is a mathematical model of the connection of the fan blades and the stationary ring in the noise reduction type centrifugal fan blade according to the first embodiment of the present invention;
FIG. 4 is a mathematical model of the flange side of the fan blade in the noise reduction type centrifugal fan blade according to the first embodiment of the invention;
FIG. 5 is another mathematical model of the connection of the fan blades and the stationary ring in the noise reduction type centrifugal fan blade according to the first embodiment of the present invention;
FIG. 6 is a mathematical model diagram of a noise reduction type centrifugal fan blade according to a first embodiment of the present invention;
FIG. 7 is an isometric view of a noise reduction type centrifugal fan blade according to a first embodiment of the present invention;
fig. 8 is a schematic structural diagram of a first fan blade and a second fan blade in a noise reduction type centrifugal fan blade according to a first embodiment of the present invention.
Reference numerals illustrate:
100-noise reduction type centrifugal fan blades; 110-fan blades; 111-flange side; 112-leading edge side; 113-concave edge side; 114-trailing edge side; 115-a first fan blade; 116-a second fan blade; 120-fixing ring; 121-a first securing ring; 122-a second securing ring.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
First embodiment
Referring to fig. 1, an embodiment of the present invention provides a noise reduction type centrifugal fan blade 100 for driving air to flow to form an air-out airflow. The air conditioner can reduce noise generated during air outlet, improve user comfort, reduce air loss, increase air outlet and improve air outlet efficiency.
It should be noted that the noise reduction type centrifugal fan blade 100 is applied to a centrifugal fan (not shown), and the centrifugal fan includes a driving motor (not shown) and the noise reduction type centrifugal fan blade 100. The driving motor is in transmission connection with the noise reduction type centrifugal fan blade 100, and can drive the noise reduction type centrifugal fan blade 100 to rotate, so that the noise reduction type centrifugal fan blade 100 generates negative pressure and drives air to flow to form air-out air flow.
Referring to fig. 2, 3 and 4, the noise reduction type centrifugal fan blade 100 includes a fan blade 110 and a fixing ring 120. The fan blade 110 is fixedly connected in the fixing ring 120, and the fixing ring 120 can fix the position of the fan blade 110. The fan blades 110 are bent to guide air, reduce air resistance and improve air outlet efficiency. Specifically, fan blade 110 is provided with a flange side 111, a front edge side 112, a concave edge side 113 and a rear edge side 114, which are connected end to end, and rear edge side 114 is connected with fixing ring 120, concave edge side 113 is a side of fan blade 110 that is concave inwards, flange side 111 is a side of fan blade 110 that is convex outwards, and front edge side 112 is a side of fan blade 110 that is far away from fixing ring 120. The cross section of the concave edge side 113 is arc-shaped, and the cross section of the flange side 111 is a fitting curve formed by sequentially connecting three curves.
It is worth noting that the central angle of the arc formed by the concave edge side 113 ranges from 90 degrees to 110 degrees, and the reasonable central angle of the concave edge side 113 can ensure that the concave edge side 113 has enough arc length to guide air while being convenient for processing and production, thereby improving the air guiding effect and reducing the generated noise. For ease of understanding, the arc of the concave edge side 113 is denoted as ab-segment, and the central angle of the arc of the concave edge side 113 is denoted as a. In the present embodiment, the central angle of the arc formed by the concave edge 113 is 100 degrees, but the present invention is not limited thereto, and in other embodiments, the central angle of the arc formed by the concave edge 113 may be 90 degrees or 110 degrees, and the size of the central angle of the arc formed by the concave edge 113 is not particularly limited.
The cross section of the flange side 111 forms a fitted curve as a function of:
Figure BDA0003335652930000051
where x is in mm, the x-axis direction is a direction from front edge side 112 to rear edge side 114 on a line connecting both ends of the mean camber line of fan blade 110, the y-axis direction is a direction perpendicular to the x-axis and from concave edge side 113 to flange side 111, and the origin is an intersection point of the mean camber line of fan blade 110 and front edge side 112. For ease of understanding, the origin is denoted as o-point.
Specifically, as can be seen from the functional relationship, the cross section of the flange side 111 includes a first curve segment, a second curve segment and a third curve segment that are sequentially connected, where the first curve segment is disposed away from the fixed ring 120, and the third curve segment is disposed close to the fixed ring 120, and the cross section of the entire flange side 111 is in a parabolic shape, so that the cross section can better adapt to the flow field variation, and the air resistance is smaller. For ease of understanding, the first curve segment is denoted as cd segment, the second curve segment is denoted as de segment, and the third curve segment is denoted as ef segment. In the process of air-out of the noise reduction type centrifugal fan blade 100, air flows on the flange side 111 from the first curve section along the second curve section and towards the third curve section, so that the surface of the flange side 111 has good flow velocity distribution, the separation and development of an air separation layer on the surface of the fan blade 110 are improved, the air resistance is effectively reduced, the air-out efficiency is improved, and the vortex noise in a volute component is reduced, so that the flow field distribution is more uniform.
In this embodiment, the flange side 111 is an eccentric structure, and the thickness of the fan blade 110 is gradually increased and then gradually decreased in the x-axis direction, so that the air flow flowing through the fan blade 110 is firstly spread outwards towards two sides of the fan blade 110, and then approaches each other along the concave edge side 113 and the flange side 111, thereby reducing air resistance and improving air outlet efficiency. When x=4.45, the distance between concave edge side 113 and convex edge side 111 is the largest, and the thickness of fan blade 110 is the largest.
In this embodiment, the cross section of the front edge side 112 is arc-shaped, so that the air flow is guided to the concave edge side 113 and the flange side 111 respectively, the air resistance is reduced, and the air guiding effect is improved. It will be appreciated that the arc of the leading edge side 112 is represented as an ac segment, which is the partial line of the concave edge side 113 and the flange side 111 that are connected to each other at the end remote from the fixing ring 120; the trailing edge side 114 presents an arc denoted as bf, which is the portion of the line where the concave edge side 113 and the flange side 111 are connected to each other at the end near the securing ring 120.
Further, the radius of the arc of the front edge 112 ranges from 0.5 mm to 0.7 mm, and the reasonable radius of the arc of the front edge 112 can reduce air resistance to the greatest extent while ensuring the air guiding effect. For ease of understanding, the radius of the arc of the leading edge side 112 is denoted as R. In the present embodiment, the radius of the arc formed by the leading edge 112 is 0.6 mm, but the present invention is not limited thereto, and in other embodiments, the radius of the arc formed by the leading edge 112 may be 0.5 mm or 0.7 mm, and the radius of the arc formed by the leading edge 112 is not particularly limited.
It should be noted that, the number of the fan blades 110 is plural, the plurality of fan blades 110 are disposed in the fixed ring 120 in a ring array, and the plurality of fan blades 110 cooperate to drive the air to flow to form the air-out airflow. Specifically, the number of the fan blades 110 ranges from 42 to 45, and the reasonable number of the fan blades 110 can reduce the generated noise as much as possible while guaranteeing the air output. In the present embodiment, the number of the fan blades 110 is 43, but not limited thereto, and in other embodiments, the number of the fan blades 110 may be 42 or 45, and the number of the fan blades 110 is not particularly limited.
Referring to fig. 5, it is noted that an inlet installation angle is formed between a circle passing through the origin and a tangent line of the origin of the circle and a tangent line of the origin of the fan blade 110, with a midpoint of the fixing ring 120 as a center of the circle. Specifically, the range of the inlet installation angle is 65-75 degrees, and the reasonable inlet installation angle can effectively improve the static pressure ratio and isentropic efficiency of the fan blade 110 while guaranteeing the air output. For ease of understanding, the inlet mounting angle is denoted B. In the present embodiment, the inlet mounting angle is 90 degrees, but the present invention is not limited thereto, and in other embodiments, the inlet mounting angle may be 65 degrees or 75 degrees, and the size of the inlet mounting angle is not particularly limited.
Further, an outlet mounting angle is formed between a circle centered at the midpoint of the fixed ring 120 and passing through the intersection of the mean camber line of the fan blade 110 and the trailing edge side 114 and the mean camber line of the fan blade 110, i.e. an outlet mounting angle is formed between a tangent line of the circle at the intersection and a tangent line of the mean camber line of the fan blade 110 at the intersection. Specifically, the range of export installation angle is 160 degrees to 175 degrees, and reasonable export installation angle can effectively increase the air-out volume, improves air-out efficiency to reduce the noise that produces. For ease of understanding, the outlet mounting angle is denoted as C. In the present embodiment, the outlet mounting angle is 168 degrees, but the present invention is not limited thereto, and in other embodiments, the outlet mounting angle may be 160 degrees or 175 degrees, and the size of the outlet mounting angle is not particularly limited.
It should be noted that, the range of the difference between the outlet installation angle and the inlet installation angle is 90 to 105 degrees, and the reasonable difference between the outlet installation angle and the inlet installation angle can reduce the generated noise as much as possible while guaranteeing the air outlet effect, and is convenient for processing the noise reduction type centrifugal fan blade 100. In this embodiment, the difference between the outlet mounting angle and the inlet mounting angle is 98 degrees, but the difference between the outlet mounting angle and the inlet mounting angle may be 90 degrees or 105 degrees in other embodiments, and the difference between the outlet mounting angle and the inlet mounting angle is not particularly limited.
Referring to fig. 6, it is noted that the ratio of the diameter of the circle passing through the origin with the center point of the fixed ring 120 to the outer diameter of the fixed ring 120 is in the range of 0.78 to 0.85, that is, the ratio of the diameter of the noise reduction centrifugal fan blade 100 is in the range of 0.78 to 0.85, so that the reasonable ratio of the diameter of the wheel can increase the air output, improve the air output efficiency, and reduce the generated noise. For ease of understanding, the diameter of a circle centered at the midpoint of the retaining ring 120 and passing through the origin is denoted D, and the outer diameter of the retaining ring 120 is denoted E. In the present embodiment, the wheel diameter ratio of the noise reduction type centrifugal fan blade 100 is 0.82, but the present invention is not limited thereto, and in other embodiments, the wheel diameter ratio of the noise reduction type centrifugal fan blade 100 may be 0.78 or 0.85, and the wheel diameter ratio of the noise reduction type centrifugal fan blade 100 is not particularly limited.
Referring to fig. 7 and 8 in combination, fan 110 includes a first fan 115 and a second fan 116. The number of the first fan blades 115 and the second fan blades 116 is plural, and the first fan blades 115 and the second fan blades 116 are disposed in the fixing ring 120. Specifically, the shapes of the first fan blade 115 and the second fan blade 116 are the same, the first fan blade 115 and the second fan blade 116 are arranged in a staggered mode, and the first fan blade 115 and the second fan blade 116 arranged in a staggered mode can effectively improve the air outlet efficiency of the noise reduction type centrifugal fan blade 100 and increase the air outlet quantity.
The fixing ring 120 includes a first fixing ring 121 and a second fixing ring 122 coaxially disposed. The diameters of the first fixing ring 121 and the second fixing ring 122 are equal, the plurality of first fan blades 115 are arranged in the first fixing ring 121 in an annular array, and the plurality of second fan blades 116 are arranged in the second fixing ring 122 in an annular array. In the process that the driving motor drives the noise reduction type centrifugal fan blade 100 to rotate, the first fixing ring 121 and the second fixing ring 122 synchronously rotate to drive the first fan blade 115 and the second fan blade 116 to move, so that the wind function is realized.
Further, in the circumferential direction of the fixing ring 120, the ratio of the angle at which the first fan blade 115 rotates to the position of the adjacent one of the second fan blades 116 to the angle at which the second fan blade 116 rotates to the position of the adjacent one of the first fan blades 115 ranges from 0.5 to 0.7, that is, on the cross section of the noise reduction centrifugal fan blade 100, one of the second fan blades 116 is located between the adjacent two first fan blades 115, wherein the ratio of the included angle between the first fan blade 115 and the second fan blade 116 to the included angle between the second fan blade 116 and the second first fan blade 115 ranges from 0.5 to 0.7. Specifically, the included angle ratio is called the staggered gear ratio of the noise reduction type centrifugal fan blade 100, and the reasonable staggered gear ratio can effectively improve the air outlet efficiency and reduce the wind noise. For ease of understanding, the angle at which the first blade 115 rotates to the position adjacent one of the second blades 116 is denoted as F, and the angle at which the second blade 116 rotates to the position adjacent one of the first blades 115 is denoted as G.
In the present embodiment, the ratio of the angle at which the first fan blade 115 rotates to the adjacent one of the second fan blades 116 to the angle at which the second fan blade 116 rotates to the adjacent one of the first fan blades 115 is 0.6, i.e. in the circumferential direction of the fixing ring 120, but not limited thereto, in other embodiments, the ratio of the teeth may be 0.5 or 0.7, and the size of the ratio of the teeth is not particularly limited thereto.
In this embodiment, the distance between two adjacent first fan blades 115 is equal to the distance between two adjacent second fan blades 116, i.e. the number of first fan blades 115 in the first fixing ring 121 is equal to the number of second fan blades 116 in the second fixing ring 122. Specifically, the distance between two adjacent first fan blades 115 ranges from 9.5 mm to 10.5 mm, and the reasonable distance between two adjacent first fan blades 115 can ensure the air guiding effect and simultaneously increase the air output as much as possible. For ease of understanding, the spacing between adjacent first blades 115 is denoted as H. In the present embodiment, the distance between two adjacent first fan blades 115 is 9.9 mm, but the present invention is not limited thereto, and in other embodiments, the distance between two adjacent first fan blades 115 may be 9.5 mm, or 10.5 mm, and the distance between two adjacent first fan blades 115 is not particularly limited.
According to the noise reduction type centrifugal fan blade 100 disclosed by the embodiment of the invention, the fan blade 110 is provided with a flange side 111, a front edge side 112, a concave edge side 113 and a rear edge side 114 which are connected end to end, the cross section of the concave edge side 113 is arc-shaped, the cross section of the flange side 111 is a fitting curve formed by sequentially connecting three sections of curves, and the function relationship of the fitting curve is as follows:
Figure BDA0003335652930000081
where x is in mm, the x-axis direction is a direction from front edge side 112 to rear edge side 114 on a line connecting both ends of the mean camber line of fan blade 110, the y-axis direction is a direction perpendicular to the x-axis and from concave edge side 113 to flange side 111, and the origin is an intersection point of the mean camber line of fan blade 110 and front edge side 112. Compared with the prior art, the noise reduction type centrifugal fan blade 100 provided by the invention has the advantages that due to the adoption of the concave edge side 113 arranged in the arc shape and the flange side 111 arranged in the fitting curve, noise generated during air outlet can be reduced, the comfort level of a user is improved, the air quantity loss is reduced, the air quantity is increased, and the air outlet efficiency is improved.
Second embodiment
The present invention provides an air conditioner (not shown) for controlling indoor air temperature. The air conditioner comprises a heat exchanger (not shown) and a centrifugal fan, wherein the centrifugal fan comprises a driving motor and a noise reduction type centrifugal fan blade 100, and the driving motor is connected with the noise reduction type centrifugal fan blade 100. The basic structure and principle of the noise reduction centrifugal fan blade 100 and the generated technical effects are the same as those of the first embodiment, and for brevity, reference may be made to the corresponding contents of the first embodiment.
In this embodiment, the position of the heat exchanger corresponds to the position of the centrifugal fan. When the air conditioner is operated, the driving motor can drive the noise reduction type centrifugal fan blade 100 to rotate so as to generate negative pressure and drive air to flow so as to form air outlet air flow, the air outlet air flow can pass through the heat exchanger and blow into a room, and in the process, the heat exchanger can heat or refrigerate the air outlet air flow so as to realize the function of regulating and controlling the indoor air temperature.
The beneficial effects of the air conditioner according to the embodiment of the present invention are the same as those of the first embodiment, and will not be described in detail herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (10)

1. The utility model provides a centrifugal fan blade of making an uproar falls, its characterized in that includes flabellum (110), flabellum (110) are provided with flange side (111), leading edge side (112), concave edge side (113) and trailing edge side (114) of end to end, the transversal arc of concave edge side (113) is personally submitted, the transversal section of flange side (111) is the fitting curve that three sections curves connect gradually and form, the functional relation of fitting curve is:
Figure FDA0003335652920000011
wherein x is in mm, the x-axis direction is a direction from the leading edge side (112) to the trailing edge side (114) on the two-end connecting line of the camber line of the fan blade (110), the y-axis direction is a direction perpendicular to the x-axis and from the concave edge side (113) to the flange side (111), and the origin is an intersection point of the camber line of the fan blade (110) and the leading edge side (112).
2. The noise reduction type centrifugal fan blade according to claim 1, wherein when x=4.45, the distance between the concave edge side (113) and the flange side (111) is the largest, and the thickness of the fan blade (110) is the largest.
3. The noise reduction type centrifugal fan blade according to claim 1, further comprising a fixing ring (120), wherein the trailing edge side (114) is connected with the fixing ring (120), the number of the fan blades (110) is plural, and the fan blades (110) are arranged in the fixing ring (120) in a ring-shaped array.
4. A noise-reducing centrifugal fan blade according to claim 3, wherein the number of fan blades (110) is in the range of 42 to 45.
5. A noise-reducing centrifugal fan blade according to claim 3, wherein an inlet mounting angle is formed between a circle passing through the origin point and a camber line of the fan blade (110) with a center point of the fixing ring (120) as a center, and the inlet mounting angle ranges from 65 degrees to 75 degrees.
6. The noise reduction type centrifugal fan blade according to claim 5, wherein an outlet mounting angle is formed between a circle passing through an intersection point of a mean camber line of the fan blade (110) and the trailing edge side (114) and the mean camber line of the fan blade (110) with a center point of the fixing ring (120) as a center, and the outlet mounting angle ranges from 160 degrees to 175 degrees.
7. The noise-reducing centrifugal fan blade of claim 6, wherein the outlet mounting angle and the inlet mounting angle have a difference in the range of 90 degrees to 105 degrees.
8. A noise-reducing centrifugal fan blade according to claim 3, wherein the ratio of the diameter of a circle passing through the origin point with respect to the center point of the fixing ring (120) to the outer diameter of the fixing ring (120) is in the range of 0.78 to 0.85.
9. The noise reduction type centrifugal fan blade according to claim 1, wherein the cross section of the front edge side (112) is arc-shaped, and the radius of the arc of the front edge side (112) ranges from 0.5 mm to 0.7 mm.
10. An air conditioner comprising a noise reducing centrifugal fan blade according to any one of claims 1 to 9.
CN202111293729.9A 2021-11-03 2021-11-03 Noise reduction type centrifugal fan blade and air conditioner Pending CN116066404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111293729.9A CN116066404A (en) 2021-11-03 2021-11-03 Noise reduction type centrifugal fan blade and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111293729.9A CN116066404A (en) 2021-11-03 2021-11-03 Noise reduction type centrifugal fan blade and air conditioner

Publications (1)

Publication Number Publication Date
CN116066404A true CN116066404A (en) 2023-05-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111293729.9A Pending CN116066404A (en) 2021-11-03 2021-11-03 Noise reduction type centrifugal fan blade and air conditioner

Country Status (1)

Country Link
CN (1) CN116066404A (en)

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