CN116066403A - Centrifugal wind wheel and air conditioner - Google Patents

Abstract

The invention discloses a centrifugal wind wheel and an air conditioner, and relates to the technical field of air conditioners. The centrifugal wind wheel comprises an impeller front disc and a plurality of first fan blades. The plurality of first fan blades are arranged in the impeller front disc in an annular array mode, the first fan blades are relatively provided with a concave edge side and a flange side, the cross section of the concave edge side comprises at least two sections of circular arcs which are different in radius and are connected in sequence, 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 centrifugal wind wheel provided by the invention has the advantages that as the concave edge side formed by at least two sections of circular arcs and the flange side arranged in a fitting curve are adopted, the air outlet efficiency can be improved, the air outlet quantity is increased, the generated noise is reduced, and the comfort level of a user is improved.

Description

Centrifugal wind wheel and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to a centrifugal wind wheel and an air conditioner.

Background

At present, in an air conditioner, a centrifugal fan is generally utilized to enable air flow to exchange heat with refrigerant in a heat exchanger so as to achieve the effect of refrigeration or heating, and in the process, a large amount of air flow passes through a centrifugal wind wheel of the centrifugal fan, so that the centrifugal wind wheel becomes a main influencing factor of noise generation in the air conditioner.

Most of the existing centrifugal wind wheels adopt a multi-wing forward form, the fan blade profile of the cross section of the existing centrifugal wind wheels consists of a single circular arc, and the fan blades have equal thickness along the chord length direction or have no change rule, so that ambient gas pressure pulsation can be caused in the operation process, air pressure acts on a volute component to form noise, a certain air quantity loss is caused, the air outlet efficiency is low, and the comfort level of users is seriously influenced.

Disclosure of Invention

The invention solves the problems of improving the air outlet efficiency, increasing the air outlet quantity, reducing the generated noise and improving the comfort level of users.

In order to solve the problems, the technical scheme of the invention is realized as follows:

in a first aspect, the invention provides a centrifugal wind wheel, comprising an impeller front disc and a plurality of first fan blades, wherein the plurality of first fan blades are arranged in the impeller front disc in a ring-shaped array, the first fan blades are relatively provided with a concave edge side and a flange side, the cross section of the concave edge side comprises at least two sections of circular arcs with different radiuses and sequentially connected, 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:

the unit of x is millimeter, the x-axis direction is the direction from the first fan blade to the front disk of the impeller on the connecting line of the two ends of the mean camber line of the first 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 endpoint of one end of the mean camber line of the first fan blade far away from the front disk of the impeller. Compared with the prior art, the centrifugal wind wheel provided by the invention has the advantages that as the concave edge side formed by at least two sections of circular arcs and the flange side arranged in a fitting curve are adopted, the air outlet efficiency can be improved, the air outlet quantity is increased, the generated noise is reduced, and the comfort level of a user is improved.

Further, when x=4.45, the distance between the concave edge side and the flange side is the largest, and the thickness of the first fan blade is the largest. The thickness of the first fan blade is gradually increased and then gradually reduced in the x-axis direction, so that the air flow flowing through the first fan blade is outwards diffused towards the two sides of the fan blade, and then approaches to each other along the concave edge side and the flange side, the air resistance is reduced, and the air outlet efficiency is improved.

Further, the cross section of the concave edge side comprises a first circular arc and a second circular arc which are sequentially connected, the first circular arc is connected with the impeller front disc through the second circular arc, and the ratio of the radius of the second circular arc to the radius of the first circular arc ranges from 1.52 to 1.7. The reasonable ratio of the radius of the second circular arc to the radius of the first circular arc can improve the air guiding effect, so that the air outlet quantity is increased, and the air outlet efficiency is improved.

Further, the central angle of the first circular arc ranges from 70 degrees to 83 degrees. The central angle of reasonable first circular arc can guarantee that first circular arc has sufficient arc length to carry out the water conservancy diversion to the air to improve the wind-guiding effect, reduce the noise that produces.

Further, one end of the first fan blade, which is far away from the front disc of the impeller, is provided with a front edge side, the concave edge side is connected with the flange side through the front edge side, the cross section of the front edge side is a third arc, and the radius range of the third arc is 0.5-0.7 mm. The radius of the reasonable third arc can reduce the air resistance to the maximum extent while guaranteeing the air guiding effect.

Further, an inlet installation angle is formed between a circle formed by taking the middle point of the impeller front disc as the center of a circle and taking the distance between the middle point of the impeller front disc and the origin as the radius and the camber line of the first fan blade, and the range of the inlet installation angle is 60-70 degrees. The reasonable inlet mounting angle can effectively improve the static pressure ratio and isentropic efficiency of the first fan blade while guaranteeing the air output.

Further, the centrifugal wind wheel further comprises an impeller rear disc and a plurality of second fan blades, the plurality of second fan blades are arranged in the impeller rear disc in an annular array, and the impeller rear disc and the impeller front disc are coaxially arranged. The impeller front disc and the impeller rear disc can synchronously rotate to drive the plurality of first fan blades and the plurality of second fan blades to move, so that the wind-blowing function is realized, and the wind-blowing quantity is increased.

Further, the first fan blade and the second fan blade are arranged in a staggered manner, and the ratio range of the angle at which the first fan blade rotates to the position of the adjacent one of the second fan blades to the angle at which the second fan blade rotates to the position of the adjacent one of the first fan blades is 0.5 to 0.7 in the circumferential direction of the front impeller disk or the rear impeller disk. Reasonable staggered gear ratio can effectively improve the air outlet efficiency and reduce the wind noise.

Further, the distance between two adjacent first fan blades ranges from 9.5 mm to 10.5 mm. The reasonable distance between two adjacent first fan blades can ensure the air guiding effect and simultaneously improve the air output as much as possible.

The invention provides an air conditioner, comprising the centrifugal wind wheel, wherein the centrifugal wind wheel comprises an impeller front disc and a plurality of first fan blades, the plurality of first fan blades are arranged in the impeller front disc in a ring-shaped array, the first fan blades are relatively provided with a concave edge side and a flange side, the cross section of the concave edge side comprises at least two sections of circular arcs with different radiuses and sequentially connected, 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:

the unit of x is millimeter, the x-axis direction is the direction from the first fan blade to the front disk of the impeller on the connecting line of the two ends of the mean camber line of the first 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 endpoint of one end of the mean camber line of the first fan blade far away from the front disk of the impeller. The air conditioner can improve air-out efficiency, increases the air-out volume, reduces the noise that produces, promotes user's comfort level.

Drawings

FIG. 1 is an isometric view of a centrifugal rotor according to a first embodiment of the invention;

fig. 2 is a schematic structural view of a front impeller disk connected with a first fan blade in a centrifugal wind wheel according to a first embodiment of the present invention;

FIG. 3 is a diagram of a mathematical model of the connection of the front impeller disk and the first fan blade in the centrifugal wind wheel according to the first embodiment of the present invention;

FIG. 4 is a mathematical model of the flange side of the first blade in the centrifugal rotor according to the first embodiment of the invention;

FIG. 5 is another mathematical model of the connection of the front impeller disk and the first fan blade in the centrifugal wind wheel according to the first embodiment of the present invention;

fig. 6 is a front view of a centrifugal rotor according to a first embodiment of the invention.

Reference numerals illustrate:

100-centrifuging a wind wheel; 110-impeller front plate; 120-impeller rear disc; 130-a first fan blade; 131-concave edge side; 132-flange side; 133-leading edge side; 140-second fan blade.

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 centrifugal wind wheel 100 for driving air to flow. The air outlet efficiency can be improved, the air outlet quantity is increased, the generated noise is reduced, and the comfort level of a user is improved.

It should be noted that, the centrifugal wind wheel 100 is applied to a centrifugal fan (not shown), and the centrifugal fan includes a driving motor (not shown) and the centrifugal wind wheel 100. The driving motor is in transmission connection with the centrifugal wind wheel 100, and can drive the centrifugal wind wheel 100 to rotate, so that the centrifugal wind wheel 100 generates negative pressure, and air flow is driven to generate air-out air flow.

The centrifugal wind wheel 100 includes an impeller front plate 110, an impeller rear plate 120, a plurality of first blades 130, and a plurality of second blades 140. The impeller front disc 110 and the impeller rear disc 120 are annular, have equal diameters, the impeller rear disc 120 and the impeller front disc 110 are coaxially arranged, and a plurality of first fan blades 130 and a plurality of second fan blades 140 are arranged between the impeller front disc 110 and the impeller rear disc 120. Specifically, the plurality of first fan blades 130 are disposed in the impeller front plate 110 in an annular array, and the plurality of second fan blades 140 are disposed in the impeller rear plate 120 in an annular array. In the process that the driving motor drives the centrifugal wind wheel 100 to rotate, the front impeller disc 110 and the rear impeller disc 120 synchronously rotate to drive the plurality of first fan blades 130 and the plurality of second fan blades 140 to move, so that a wind function is realized, and the wind output is increased.

Referring to fig. 2, 3 and 4 in combination, in the present embodiment, the first fan blade 130 is bent to guide air, reduce air resistance, improve air outlet efficiency, and increase air outlet. Specifically, the first fan blade 130 is relatively provided with a concave edge side 131 and a convex edge side 132, where the concave edge side 131 is a side of the first fan blade 130 that is concave inwards, and the convex edge side 132 is a side of the first fan blade 130 that is convex outwards. The cross section of the concave edge side 131 comprises at least two sections of circular arcs with different radiuses and sequentially connected, and the cross section of the flange side 132 is a fitting curve formed by sequentially connecting three sections of curves.

It is noted that the cross section of the concave edge side 131 includes a first arc and a second arc which are sequentially connected, the second arc is disposed between the first arc and the impeller front disc 110, the first arc is connected with the impeller front disc 110 through the second arc, and centers of the first arc and the second arc are located on a side of the concave edge side 131 away from the flange side 132. For ease of understanding, the first arc is denoted as the ab segment and the second arc is denoted as the bc segment. During rotation of the centrifugal wind wheel 100, the air flow flows on the concave edge side 131 from the first circular arc in the direction of the second circular arc. However, the present invention is not limited thereto, and in other embodiments, the cross section of the concave edge side 131 may include three or four arcs connected in sequence, and the number of the arcs forming the concave edge side 131 is not particularly limited.

The ratio of the radius of the second arc to the radius of the first arc ranges from 1.52 to 1.7. The reasonable ratio of the radius of the second circular arc to the radius of the first circular arc can improve the air guiding effect, so that the air outlet quantity is increased, and the air outlet efficiency is improved. For ease of understanding, the radius of the first arc is denoted as L and the radius of the second arc is denoted as M. In the present embodiment, the ratio of the radius of the second arc to the radius of the first arc is 1.6, but the ratio of the radius of the second arc to the radius of the first arc may be 1.52 or 1.7 in other embodiments, and the ratio of the radius of the second arc to the radius of the first arc is not particularly limited.

Further, the central angle range of the first arc is 70-83 degrees, and the reasonable central angle of the first arc can ensure that the first arc has enough arc length to guide air, so that the air guiding effect is improved, and the generated noise is reduced. For ease of understanding, the central angle of the first circular arc is denoted as a. In this embodiment, the central angle of the first arc is 76 degrees, but not limited thereto, and in other embodiments, the central angle of the first arc may be 70 degrees or 83 degrees, and the size of the central angle of the first arc is not specifically limited.

Notably, the cross-section of the flange side 132 forms a fitted curve as a function of:

the unit of x is millimeter, the x-axis direction is the direction from the first fan blade 130 to the impeller front plate 110, the y-axis direction is the direction perpendicular to the x-axis and from the concave edge side 131 to the flange side 132, and the origin is the end point of the camber line of the first fan blade 130 away from one end of the impeller front plate 110. 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 132 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 impeller front disc 110, and the third curve segment is disposed close to the impeller front disc 110, and the cross section of the entire flange side 132 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 de segment, the second curve segment as ef segment, and the third curve segment as fg segment. In the process of air-out of the centrifugal wind wheel 100, air flows on the flange side 132 from the first curve section along the second curve section and towards the third curve section, so that the surface of the flange side 132 has better flow velocity distribution, the separation and development of an air separation layer on the surface of the first fan blade 130 are improved, the air resistance is effectively reduced, the air-out efficiency is improved, and the vortex noise in the volute component is reduced, so that the flow field distribution is more uniform.

In this embodiment, the concave edge side 131 and the flange side 132 are both eccentric structures, the first curved section and a part of the second curved section correspond to the first circular arc, and the third curved section and another part of the second curved section correspond to the second circular arc. Specifically, the thickness of the first fan blade 130 gradually increases and then gradually decreases in the x-axis direction, so that the air flow flowing through the first fan blade 130 is firstly diffused outwards towards two sides of the fan blade, and then approaches to each other along the concave edge side 131 and the flange side 132, thereby reducing air resistance and improving air outlet efficiency. When x=4.45, the distance between the concave edge side 131 and the flange side 132 is the largest, and the thickness of the first fan blade 130 is the largest.

It should be noted that, the end of the first fan blade 130 away from the impeller front disc 110 is provided with a front edge side 133, the concave edge side 131 is connected with the flange side 132 through the front edge side 133, and the cross section of the front edge side 133 is a third arc, so as to guide the air flow to the concave edge side 131 and the flange side 132 respectively, reduce the air resistance, and improve the air guiding effect. It will be appreciated that the third arc is denoted as ad segment, i.e. the part-line where the concave edge side 131 and the flange side 132 are connected to each other at the end remote from the impeller front disc 110.

Further, the radius range of the third circular arc is 0.5 mm to 0.7 mm, and the reasonable radius of the third circular arc can reduce air resistance to the maximum extent while guaranteeing the air guiding effect. For ease of understanding, the radius of the third circular arc is denoted as N. In the present embodiment, the radius of the third arc is 0.6 mm, but the present invention is not limited thereto, and in other embodiments, the radius of the third arc may be 0.5 mm or 0.7 mm, and the radius of the third arc is not particularly limited.

It is noted that, an inlet installation angle is formed between a circle formed by taking the midpoint of the impeller front disc 110 as the center and taking the distance between the midpoint of the impeller front disc 110 and the origin as the radius and the camber line of the first fan blade 130, that is, an inlet installation angle is formed between a circle formed by taking the midpoint of the impeller front disc 110 as the center and passing through the origin and the camber line of the first fan blade 130, and an inlet installation angle is formed between a tangent line of the circle at the origin and a tangent line of the camber line of the first fan blade 130 at the origin.

Referring to fig. 5, further, the range of the inlet mounting angle is 60 to 70 degrees, and the reasonable inlet mounting angle can effectively improve the static pressure ratio and isentropic efficiency of the first fan blade 130 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 65 degrees, but not limited thereto, and in other embodiments, the inlet mounting angle may be 60 degrees or 70 degrees, and the size of the inlet mounting angle is not particularly limited.

Referring to fig. 6, it should be noted that the first fan blade 130 and the second fan blade 140 are arranged in a staggered manner, and the first fan blade 130 and the second fan blade 140 arranged in a staggered manner can effectively improve the air outlet efficiency of the centrifugal wind wheel 100 and increase the air outlet quantity. Specifically, in the circumferential direction of the impeller front disc 110 or the impeller rear disc 120, the ratio of the angle at which the first fan blade 130 rotates to the position adjacent to one second fan blade 140 to the angle at which the second fan blade 140 rotates to the position adjacent to one first fan blade 130 is in the range of 0.5 to 0.7. That is, on the cross section of the centrifugal wind wheel 100, one second fan blade 140 is located between two adjacent first fan blades 130, wherein the ratio of the included angle between the first fan blade 130 and the second fan blade 140 to the included angle between the second fan blade 140 and the second first fan blade 130 is in the range of 0.5 to 0.7. Specifically, the included angle ratio is called the staggered gear ratio of the centrifugal wind wheel 100, and the reasonable staggered gear ratio can effectively improve the wind outlet efficiency and reduce wind noise. For ease of understanding, the angle at which the first fan blade 130 rotates to the position adjacent to one second fan blade 140 is denoted as C, and the angle at which the second fan blade 140 rotates to the position adjacent to one first fan blade 130 is denoted as D.

In this embodiment, the ratio of the angle at which the first fan blade 130 rotates to the position adjacent to the second fan blade 140 and the angle at which the second fan blade 140 rotates to the position adjacent to the first fan blade 130 in the circumferential direction of the impeller front disc 110 or the impeller rear disc 120 is 0.6, but the present invention is not limited thereto, and in other embodiments, the ratio of the stagger teeth may be 0.5 or 0.7, and the size of the stagger teeth is not particularly limited thereto.

Further, the distance between two adjacent first fan blades 130 ranges from 9.5 mm to 10.5 mm, and the reasonable distance between two adjacent first fan blades 130 can increase the air output as much as possible while guaranteeing the air guiding effect. For ease of understanding, the spacing between adjacent two first blades 130 is denoted as H. In the present embodiment, the distance between two adjacent first fan blades 130 is 9.9 mm, but is not limited thereto, and in other embodiments, the distance between two adjacent first fan blades 130 may be 9.5 mm, or may be 10.5 mm, and the distance between two adjacent first fan blades 130 is not particularly limited.

In this embodiment, the number of the second fan blades 140 is equal to the number of the first fan blades 130, and the specific structure of the second fan blades 140 is the same as that of the first fan blades 130, which is not described herein.

In the centrifugal wind wheel 100 according to the embodiment of the present invention, a plurality of first fan blades 130 are disposed in a front impeller disk 110 in a ring array, the first fan blades 130 are relatively provided with a concave edge side 131 and a flange side 132, the cross section of the concave edge side 131 includes at least two sections of circular arcs with different radii and sequentially connected, the cross section of the flange side 132 is a fitting curve formed by sequentially connecting three sections of curves, and the function relationship of the fitting curve is:

the unit of x is millimeter, the x-axis direction is the direction from the first fan blade 130 to the impeller front plate 110, the y-axis direction is the direction perpendicular to the x-axis and from the concave edge side 131 to the flange side 132, and the origin is the end point of the camber line of the first fan blade 130 away from one end of the impeller front plate 110. Compared with the prior art, the centrifugal wind wheel 100 provided by the invention has the advantages that as the concave edge side 131 formed by at least two sections of circular arcs and the flange side 132 arranged in a fitting curve are adopted, the air outlet efficiency can be improved, the air outlet quantity is increased, the generated noise is reduced, and the comfort level of a user is improved.

Second embodiment

The present invention provides an air conditioner (not shown) for controlling indoor air temperature. The air conditioner includes a heat exchanger (not shown) and a centrifugal fan including a driving motor and a centrifugal wind wheel 100, the driving motor being connected with the centrifugal wind wheel 100. The basic structure and principle of the centrifugal wind wheel 100 and the technical effects thereof are the same as those of the first embodiment, and for brevity, reference is made to the corresponding contents of the first embodiment where the description of the embodiment is not mentioned.

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 centrifugal wind wheel 100 to rotate so as to generate negative pressure and drive air to flow so as to form air-out air flow, the air-out 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-out 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 wind wheel, its characterized in that includes impeller front disc (110) and a plurality of first fan blade (130), a plurality of first fan blade (130) be annular array ground set up in impeller front disc (110), first fan blade (130) are provided with concave edge side (131) and flange side (132) relatively, the cross section of concave edge side (131) includes at least two sections different and the circular arc that connects gradually of radius, the cross section of flange side (132) is the fitting curve that the three sections curves connect gradually and form, the functional relation of fitting curve is:

the unit of x is millimeter, the x-axis direction is the direction from the first fan blade (130) to the impeller front disc (110) on the connecting line of the two ends of the mean camber line of the first fan blade (130), the y-axis direction is the direction perpendicular to the x-axis and from the concave edge side (131) to the flange side (132), and the origin is the end point of the mean camber line of the first fan blade (130) far away from one end of the impeller front disc (110).

2. A centrifugal wind wheel according to claim 1, wherein the distance between the concave edge side (131) and the flange side (132) is greatest and the thickness of the first blade (130) is greatest when x = 4.45.

3. Centrifugal wind wheel according to claim 1, wherein the cross section of the concave edge side (131) comprises a first arc and a second arc connected in sequence, the first arc being connected with the impeller front disc (110) by means of the second arc, the ratio of the radius of the second arc to the radius of the first arc being in the range of 1.52 to 1.7.

4. A centrifugal wind wheel according to claim 3, wherein the central angle of the first circular arc ranges from 70 degrees to 83 degrees.

5. Centrifugal wind wheel according to claim 1, wherein the end of the first blade (130) remote from the impeller front disc (110) is provided with a leading edge side (133), the concave edge side (131) is connected with the flange side (132) through the leading edge side (133), the cross section of the leading edge side (133) is a third arc, and the radius of the third arc ranges from 0.5 mm to 0.7 mm.

6. The centrifugal wind wheel according to claim 1, wherein an inlet mounting angle is formed between a circle formed by taking a midpoint of the impeller front disc (110) as a center and taking a distance between the midpoint of the impeller front disc (110) and the origin as a radius and a camber line of the first fan blade (130), and the inlet mounting angle ranges from 60 degrees to 70 degrees.

7. The centrifugal wind wheel according to claim 1, further comprising an impeller rear disc (120) and a plurality of second blades (140), wherein a plurality of the second blades (140) are arranged in the impeller rear disc (120) in a ring-shaped array, and wherein the impeller rear disc (120) and the impeller front disc (110) are coaxially arranged.

8. The centrifugal wind wheel according to claim 7, wherein the first fan blade (130) and the second fan blade (140) are arranged in a staggered manner, and a ratio of an angle at which the first fan blade (130) rotates to a position adjacent to the second fan blade (140) to an angle at which the second fan blade (140) rotates to a position adjacent to the first fan blade (130) ranges from 0.5 to 0.7 in a circumferential direction of the impeller front disc (110) or the impeller rear disc (120).

9. A centrifugal wind wheel according to claim 1, wherein the distance between two adjacent first blades (130) is in the range of 9.5 mm to 10.5 mm.

10. An air conditioner comprising a centrifugal wind wheel according to any one of claims 1 to 9.

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