CN106122087B

CN106122087B - Centrifugal wind wheel and air conditioner

Info

Publication number: CN106122087B
Application number: CN201610768769.7A
Authority: CN
Inventors: 叶海林
Original assignee: Midea Group Co Ltd; Wuhu Meizhi Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Meizhi Air Conditioning Equipment Co Ltd
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2020-01-14
Anticipated expiration: 2036-08-30
Also published as: CN106122087A

Abstract

The invention discloses a centrifugal wind wheel and an air conditioner, wherein the centrifugal wind wheel comprises a hub and a spoke connected with the hub, the spoke comprises a plurality of spokes arranged at intervals, and noise reduction holes are formed in the spokes in a penetrating mode. According to the technical scheme, the spokes of the centrifugal wind wheel are provided with the noise reduction holes, so that on one hand, the rigidity of the spokes is reduced, the conduction of vibration is weakened, on the other hand, air on the side of a fan and the side of a blade of the centrifugal wind wheel are communicated with each other, the formation of vortex is reduced, and the noise of the centrifugal wind wheel is reduced on the two aspects.

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 provided with the centrifugal wind wheel.

Background

The centrifugal wind wheel is usually arranged in the air conditioner, and can generate noise when in operation, so that the user experience is influenced.

Disclosure of Invention

The invention mainly aims to provide a centrifugal wind wheel, aiming at reducing the noise generated by the centrifugal wind wheel during operation.

In order to achieve the purpose, the centrifugal wind wheel provided by the invention comprises a hub and a spoke connected with the hub, wherein the spoke comprises a plurality of spokes arranged at intervals, and a noise reduction hole is formed in the spoke in a penetrating manner.

Preferably, each spoke is provided with two noise reduction holes.

Preferably, the two noise reduction holes are arranged side by side in the extending direction of the spoke.

Preferably, the two noise reduction holes are arranged at intervals in the extending direction of the spoke.

Preferably, the two noise reduction holes are arranged at intervals in the circumferential direction of the hub.

Preferably, the wavelength of the mechanical wave generated by the vibration of the hub is λ, and the distance between the two noise reduction holes in the extending direction of the spokes is an odd multiple of λ.

Preferably, the number of spokes is an odd number.

Preferably, the number of spokes is a prime number.

Preferably, the outer side surface of the spoke is provided with an annular reinforcing rib positioned at the periphery of the noise reduction hole.

Preferably, the outer side surface of the hub is provided with ribs extending along the radial direction of the hub, and the extending tail ends of the ribs are connected with the annular reinforcing ribs.

Preferably, the noise reduction holes are arranged in a gradually expanding manner from the outer side surface of the spoke to the inner side surface of the spoke.

The invention also provides an air conditioner which comprises the centrifugal wind wheel, wherein the centrifugal wind wheel comprises a hub and spokes connected with the hub, the spokes comprise a plurality of spokes arranged at intervals, and noise reduction holes are formed in the spokes in a penetrating manner.

According to the technical scheme, the spokes of the centrifugal wind wheel are provided with the noise reduction holes, so that on one hand, the rigidity of the spokes is reduced, the conduction of vibration is weakened, on the other hand, air on the side of a fan and the side of a blade of the centrifugal wind wheel are communicated with each other, the formation of vortex is reduced, and the noise of the centrifugal wind wheel is reduced on the two aspects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of a first embodiment of a centrifugal wind rotor according to the present invention;

FIG. 2 is a top view of the centrifugal wind rotor of FIG. 1;

fig. 3 is a schematic structural view of a centrifugal wind rotor according to a second embodiment of the present invention;

FIG. 4 is a schematic plan view of the centrifugal rotor of FIG. 3 from another perspective;

fig. 5 is a schematic structural view of a third embodiment of a centrifugal wind rotor according to the present invention;

FIG. 6 is a top view of the centrifugal rotor of FIG. 5;

fig. 7 is a schematic diagram of interference of mechanical waves generated by vibration after passing through two noise reduction holes.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Centrifugal wind wheel	11	Wind-guiding ring
12	Blade	13	Wheel hub
				14	Spoke	15	Mounting plate
130	Mounting hole	131	Ribs
				141	Noise reduction hole	142	Annular reinforcing rib

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating 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 addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a centrifugal wind wheel and an air conditioner with the same.

Referring to fig. 1, a centrifugal wind wheel 10 generally includes a wind-guiding ring 11, a blade 12 and a blade seat, and opposite ends of the blade 12 are respectively connected to the wind-guiding ring 11 and the blade seat. The blade mount comprises a hub 13, spokes and a mounting disc 15, the spokes connecting the mounting disc 15 and the hub 13.

In the embodiment of the present invention, as shown in fig. 1 and 2, the centrifugal wind wheel 10 includes a hub 13 and spokes connecting the hub 13, the spokes include a plurality of spokes 14 arranged at intervals, and the spokes 14 are provided with noise reduction holes 141 through.

Specifically, when the centrifugal wind wheel 10 is in operation, the noise source mainly comes from several aspects. On one hand, the motor shaft and the inner wall of the mounting hole 130 have a partial gap, and when the centrifugal wind wheel 10 rotates, vibration is generated between the motor shaft and the hub 13. On the other hand, the voltage of the power grid is unstable, harmonic waves are easily generated, the harmonic waves can affect the operation of the motor, and the harmonic waves affect the operation of the motor, vibration is inevitably generated between the motor shaft and the centrifugal wind wheel 10 in the process of high-speed rotation of the motor, the vibration can be transmitted to the wheel spokes through the hub 13, then transmitted to the mounting disc 15 through the wheel spokes, then transmitted to the blades 12, and finally, noise generated by the blades 12 is large. In another aspect, when the centrifugal wind wheel 10 is in operation, air can be introduced into both the motor side and the blade 12 side of the centrifugal wind wheel 10, and eddy currents are easily generated inside the centrifugal wind wheel 10, thereby generating noise.

In this embodiment, the noise reduction holes 141 are formed in the spokes 14, so that on one hand, the internal stress of the spokes 14 can be reduced, the overall rigidity of the spokes can be reduced within the allowable range of the design strength, the spokes have better toughness, and the conduction of the spokes 14 to vibration can be reduced.

The opening of the noise reduction hole 141 can enable air on the motor side and air on the blade side to mutually circulate, so that formation of eddy current is reduced, and noise generated by the eddy current is reduced.

In order to verify the noise reduction effect of the opening on the wind wheel in the embodiment, a test is performed on 6 centrifugal wind wheels 10, wherein 3 centrifugal wind wheels 10 are not provided with noise reduction holes 141, 3 centrifugal wind wheels 10 are provided with noise reduction holes 141 (the noise reduction holes 141 of the 3 centrifugal wind wheels 10 are the same in number, position and size), 220v constant voltage is simultaneously transmitted to the motor, and the noise generated by the 6 centrifugal wind wheels 10 is simultaneously measured.

TABLE 1 noise comparison table for centrifugal wind wheel before and after opening

It can be seen from the table that the noise of the centrifugal wind wheel 10 with the noise reduction holes 141 is reduced by 1.10dB on average.

According to the technical scheme, the noise reduction holes 141 are formed in the spokes 14 of the centrifugal wind wheel 10, so that on one hand, the rigidity of the spokes 14 is reduced, the conduction of vibration is weakened, on the other hand, air on the wind wheel side and the blade 12 side of the centrifugal wind wheel 10 are communicated with each other, the formation of vortex is reduced, and the noise of the centrifugal wind wheel 10 is reduced in the two aspects.

Referring to fig. 1 to 6, on the basis of the above embodiment, in order to further reduce the conduction of vibration by the spokes 14, in the present embodiment, two noise reduction holes 141 are provided on each of the spokes 14. The two noise reduction holes 141 have a better effect of blocking the propagation of vibration.

The two noise reduction holes 141 may be arranged at intervals in the extending direction of the spoke 14 (see fig. 1 and 2), or may be arranged side by side in the extending direction of the spoke 14 (see fig. 3).

The two noise reduction holes 141 are arranged side by side or at intervals, which is equivalent to two barriers applied to vibration, and can further reduce the conduction of vibration.

Referring to fig. 5 and 6, in order to further reduce noise, the noise reduction holes 141 are spaced in the extending direction of the spokes 14 and in the circumferential direction of the hub 13. In this way, the conduction path of the mechanical wave generated by the vibration of the hub 13 on the spokes 14 is lengthened, and finally, the amplitude of the mechanical wave conducted to the blades is weakened, so that the noise reduction effect is achieved.

Furthermore, referring to fig. 5 and 7, on the basis of the above embodiment, in order to reduce the noise, the distance between the two noise reduction holes 141 in the extending direction of the spoke 14 is L (when the spoke 14 is arc-shaped, L refers to the arc-shaped distance between the two noise reduction holes), where L is an odd multiple of λ, in order to reduce the wavelength λ of the mechanical wave generated by the hub 13. Specifically, in the process that the vibration is transmitted from the hub 13 to the spoke, the noise reduction holes 141 generate phase delay for the mechanical wave, the mechanical wave passing through the two noise reduction holes 141 interferes, and L is an odd multiple of λ, so that the mechanical wave passing through the two noise reduction holes 141 is subjected to superposition cancellation (the wave crest and the wave trough meet), so that the transmission of the vibration can be greatly reduced, and the noise is also greatly reduced.

In this case, λ is variable, and the λ values of different centrifugal wind wheels 10 are different, and the λ values are different for motors with different rotation speeds. Therefore, taking the air conditioner as an example, when the air conditioner normally works, the normal rotation speed of the motor driving the centrifugal wind wheel 10 to rotate is generally 850rpm, at this time, the motor driving the centrifugal wind wheel 10 to rotate at 850rpm can be used, the wavelength λ of the mechanical wave generated by the centrifugal wind wheel 10 at this time is measured, and then the noise reduction hole 141 is formed on the basis that L is an odd multiple of λ.

The shape of the noise reduction holes 141 may be various, for example, a kidney-shaped hole, a circular hole, a square hole, a triangular hole, and other regular or irregular shapes are possible.

In addition, considering that the centrifugal wind wheel 10 generates resonance between the spokes when rotating, in this embodiment, the number of the spokes 14 is an odd number (referring to fig. 1 to 6, the number of the spokes 14 in the centrifugal wind wheel is an even number, and the figures are only for reference and do not represent the best embodiment). Since odd spoke 14 combinations can bring more performance advantages than even spoke 14 combinations. If the number of the spokes 14 is designed to be even number and the spokes are arranged symmetrically, not only the balance of the spokes 14 themselves is difficult to adjust, but also the spokes 14 generate more resonance to generate noise, and even the spokes 14 cannot bear fatigue caused by the resonance for a long time, and finally the spokes 14 break. Thus, in the present embodiment, the number of spokes 14 is odd, for example: 3, 5, 7, 9 or even more.

Considering that even if there are odd spokes 14, for example, 9 spokes, that is, there are three spokes 14 in a group, there are three groups in total, and the three spokes 14 will resonate with each other to generate noise. Therefore, in the present embodiment, further, the number of the spokes 14 is odd, for example, 7, 11, 13, etc., so that the resonance among the spokes 14 can be greatly reduced and the noise is lower.

Referring to fig. 3 and 4, when the centrifugal wind wheel 10 rotates at a high speed, the noise reduction holes 141 formed in the spokes 14 may reduce the local strength around the noise reduction holes 141, and the noise reduction holes 141 may crack after the centrifugal wind wheel 10 operates for a long time. In the present embodiment, in order to reinforce the strength of the spoke 14, an annular rib 142 is provided on the outer side surface (the surface facing the motor) of the spoke 14, and is located at the periphery of the noise reduction hole 141. In this embodiment, 6 centrifugal wind wheels 10 are used for testing, noise reduction holes 141 are formed in spokes 14 of the 6 centrifugal wind wheels 10 (the noise reduction holes 141 are the same in number, position and size), wherein annular reinforcing ribs 142 are arranged on the backs of 3 centrifugal wind wheels, and the annular reinforcing ribs 142 are not arranged on the other 3 centrifugal wind wheels.

TABLE 2 noise contrast table for centrifugal wind wheel before and after setting up annular reinforcing rib

As can be seen from table 2, the noise of the centrifugal wind rotor 10 is slightly increased by providing the annular reinforcing ribs 142.

Reason analysis: before the annular reinforcing rib 142 is arranged, the integral rigidity of the centrifugal wind wheel 10 is enhanced due to the annular reinforcing rib 142, the benefit of the opening is very large, namely, the integral rigidity of the centrifugal wind wheel 10 is reduced, the transmission of vibration is reduced, and the beneficial effect of the noise reduction hole 141 is reduced to a certain extent after the annular reinforcing rib 142 is arranged. If the annular reinforcing rib 142 is not arranged, the centrifugal wind wheel strength of 10 degrees may not meet the requirement, so that the centrifugal wind wheel 10 is broken when rotating. Therefore, under the condition of less influence on noise, the annular reinforcing ribs 142 can ensure that the service life of the centrifugal wind wheel 10 is prolonged.

When air on the side of the fan enters the centrifugal wind wheel 10 through the noise reduction holes 141, the direction of the air flow entering is relatively disordered, and when the air flow with disordered direction enters the centrifugal wind wheel 10, vortex flow is easily generated, so that partial noise is formed. After the annular reinforcing rib 142 is arranged, the annular reinforcing rib 142 has an adjusting effect on the airflow entering from the noise reduction hole 141, so that the entering airflow direction is uniform, the formation of vortex is reduced, and the noise is also reduced.

When the centrifugal wind wheel 10 rotates at a high speed, the hub 13 and the spokes 14 are easily deformed, so that the air inlet portion is uniform, and noise is generated. In this embodiment, the outer side surface of the hub 13 is provided with ribs 131 extending along the radial direction of the hub 13, and the extending ends of the ribs 131 are connected with the annular reinforcing ribs 141. Thus, the connection strength between the hub 13 and the spokes 14 is higher, and the hub 13 and the spokes are not easy to deform.

In another preferred embodiment, the noise reduction holes 141 are arranged to be gradually enlarged from the outer side surface of the spoke 14 toward the inner side surface of the spoke 14. Thus, when the airflow enters the centrifugal wind wheel 10 through the noise reduction holes 141, the flow velocity of the airflow is reduced, the degree of impact between the airflow and the airflow from the wind inducing ring is reduced, and the formed vortex is less, so that the noise reduction effect is achieved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a centrifugal wind wheel, includes wheel hub and connection wheel hub's spoke, wheel hub is last to be provided with the mounting hole of power supply motor shaft installation, a serial communication port, the spoke includes the spoke that a plurality of intervals set up, it falls the hole of making an uproar to run through on the spoke, the spoke has the orientation the lateral surface of motor, the lateral surface is equipped with and is located fall the peripheral annular strengthening rib in hole of making an uproar.

2. A centrifugal wind wheel according to claim 1, wherein two noise reduction holes are provided in each of the spokes.

3. A centrifugal wind wheel according to claim 2, wherein two of said noise reduction holes are arranged side by side in the direction of extension of said spokes.

4. A centrifugal wind wheel according to claim 2, wherein the noise reduction holes are spaced in the direction of extension of the spokes.

5. A centrifugal wind wheel according to claim 2, wherein two of the noise-reducing holes are arranged at intervals in the circumferential direction of the hub.

6. A centrifugal wind wheel according to claim 5 wherein the hub vibrates to produce mechanical waves having a wavelength λ and the spacing between the noise reduction holes in the direction of extension of the spokes is an odd multiple of λ.

7. A centrifugal wind wheel according to claim 1, wherein the number of spokes is an odd number.

8. A centrifugal wind wheel according to claim 7, wherein the spokes are prime in number.

9. A centrifugal wind wheel according to claim 1, wherein the outer side of the hub is provided with ribs extending in the radial direction of the hub, and the extending ends of the ribs are connected with the annular reinforcing ribs.

10. A centrifugal wind wheel according to claim 1, wherein the noise reduction holes are arranged to be gradually enlarged from the outer side surface of the spoke toward the inner side surface of the spoke.

11. An air conditioner characterized by comprising a centrifugal wind rotor according to any one of claims 1 to 10.