Centrifugal fan with tongue air gap

Abstract

A centrifugal fan with a tongue portion air gap comprises a shell, the shell is provided with a vortex type side plate and an air inlet, the vortex type side plate comprises an outlet cavity and an air outlet, a tongue portion is formed on one side of the air outlet, and the tongue portion comprises an inwards-inclined section, an outwards-inclined section and a tongue flange arranged between the inwards-inclined section and the outwards-inclined section; the centrifugal fan blade is rotationally arranged in the cavity, and one side of the centrifugal fan blade and the tongue part inwards-inclined section are arranged in a spaced mode; and the noise reduction air gap is arranged at the tongue part in a bypass channel form and comprises an air inlet end, an air outlet end and a bent channel between the air inlet end and the air outlet end. According to the centrifugal fan, the intensity of narrow-band noise can be reduced, the effect of greatly reducing the noise at the air outlet is further achieved, and therefore the quality of the centrifugal fan is improved. Compared with the prior art, the utility model has practical advancement and better industrial utilization.

Description

Technical Field

[0001] The utility model relates to a centrifugal fan, in particular to a centrifugal fan with a tongue air gap. Background Art

[0002] The difference between a centrifugal fan and an axial fan is that the centrifugal fan takes in air in the axial direction of the blades, but exhausts air in the radial direction of the blades. The blades of a centrifugal fan include a hub and several blades, which are arranged radially around the hub.

[0003] Generally speaking, in order to maximize the performance of laptops, a heat dissipation module is required for effective heat dissipation. However, in order to meet the miniaturization needs of the evolving mass market, laptops can no longer reserve enough natural convection space inside the casing. Therefore, the heat dissipation module of laptops is gradually moving towards using centrifugal fans to generate forced convection for heat dissipation. In the design of the centrifugal fan, the high static pressure and high speed characteristics generated by the fan volute shell are mainly used to overcome the problem of difficult air convection in the narrow space of the laptop system. However, when the wake generated by the fan blades hits the surface of the vortex side plate of the tongue, each impact point can be regarded as the source of the narrow band noise. Since the surface of the vortex side plate of the tongue is parallel to the axis, according to the principle of wave superposition, a blade pass frequency with a large amplitude and fixed frequency will be generated. Once the heat dissipation performance needs to be improved, the air volume and wind speed must be increased. However, when the speed increases and the flow rate is increased, a higher frequency noise spectrum is obtained, resulting in a higher noise value.

[0004] Based on the above, the relevant industry urgently needs to improve the tongue shape of the scroll side plate to solve the noise problem caused by the centrifugal fan.

[0005] Therefore, in view of the problems existing in the above-mentioned existing centrifugal fan structure, how to develop an innovative structure that is more ideal and practical is indeed a goal and direction that the relevant industry must work hard to develop and break through. In view of this, the inventor, based on his many years of experience in manufacturing, developing and designing related products, has designed and carefully evaluated the above-mentioned goals and finally obtained a practical solution. Utility Model Content

[0006] The utility model aims to provide a centrifugal fan with a tongue air gap.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A centrifugal fan with a tongue air gap, comprising:

[0009] A housing having a vortex side plate and an air inlet, the vortex side plate having a cavity and an air outlet, a tongue portion formed on one side of the air outlet, the tongue portion comprising an inwardly inclined section, an outwardly inclined section and a tongue flange between the inwardly inclined section and the outwardly inclined section;

[0010] a centrifugal fan blade, rotatably disposed in the cavity, with one side of the centrifugal fan blade being spaced apart from the inwardly inclined section of the tongue;

[0011] A noise reduction air gap is arranged on the tongue in the form of a side channel. The noise reduction air gap includes an air inlet end, an air outlet end and a curved channel between the air inlet end and the air outlet end.

[0012] According to a further technical solution, an air inlet end of the noise reduction air gap is arranged at the outwardly inclined section of the tongue, and an air outlet end of the noise reduction air gap is arranged at the inwardly inclined section of the tongue.

[0013] According to a further technical solution, an air inlet end of the noise reduction air gap is arranged at a tongue flange of the tongue portion, and an air outlet end of the noise reduction air gap is arranged at an outer wall of the volute side plate adjacent to the air outlet.

[0014] According to a further technical solution, the curved channel of the noise reduction air gap is configured as a Tesla valve.

[0015] A further technical solution is to configure the noise reduction air gap of the Tesla valve type to be a forward or reverse configuration type to achieve flow acceleration or deceleration effect.

[0016] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0017] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0018] The working principle and advantages of this utility model are as follows:

[0019] Through innovative structural morphology and technical features, the utility model can utilize the side channel morphology characteristics formed by the noise reduction air gap to destroy the structural conditions similar to the resonance cavity inside the centrifugal fan, thereby hindering the superposition of high-order harmonics and the formation of noise resonance, that is, destroying the wave superposition phenomenon caused by the surface of the vortex side plate at the tongue of the air field wake, so that the intensity of narrow-band noise is reduced, and then it can achieve a significant reduction in the noise at the air outlet, and relatively improve the quality of the centrifugal fan. In summary, the utility model has practical progress and better industrial applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 An exploded perspective view of an embodiment of the utility model;

[0021] Attached Figure 2 A plan view of an embodiment of the utility model;

[0022] Attached Figure 3 for Figure 2 A partial enlarged view of the 3 marked points;

[0023] Attached Figure 4 It is a schematic diagram of a second embodiment of the noise reduction air gap type of the utility model;

[0024] Attached Figure 5 It is a schematic diagram of the third embodiment of the noise reduction air gap type of the utility model;

[0025] Attached Figure 6 It is a schematic diagram of a fourth embodiment of the noise reduction air gap type of the present invention.

[0026] In the above figures: 10. Shell; 11. Scroll side plate; 12. Air inlet; 20. Cavity; 21. Air outlet; 30. Tongue; 31. Inwardly inclined section; 32. Outwardly inclined section; 33. Tongue flange; 40. Centrifugal fan blade; 50. Noise reduction air gap; 51. Air inlet end; 52. Air outlet end; 53. Curved channel. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0028] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0029] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0030] See also Figure 1 , Figure 2 , Figure 3 As shown, a preferred embodiment of a centrifugal fan with a tongue air gap of the utility model is shown. This embodiment is for illustration only and the patent application is not limited to this structure.

[0031] The centrifugal fan includes the following structures: a shell 10, having a vortex side plate 11 and an air inlet 12, the vortex side plate 11 has a cavity 20 and an air outlet 21, a tongue 30 is formed on one side of the air outlet 21, the tongue 30 includes an inwardly inclined section 31, an outwardly inclined section 32 and a tongue flange 33 between the inwardly inclined section 31 and the outwardly inclined section 32; a centrifugal fan blade 40, which is rotated in the cavity 20, and one side of the centrifugal fan blade 40 is spaced apart from the inwardly inclined section 31 of the tongue 30; a noise reduction air gap 50, which is arranged on the tongue 30 in the form of a side channel, and the noise reduction air gap 50 includes an air inlet end 51, an air outlet end 52 and a curved channel 53 between the air inlet end 51 and the air outlet end 52.

[0032] like Figure 3 , Figure 4 and Figure 5 As shown, in this example, the air inlet end 51 of the noise reduction air gap 50 is disposed at the outwardly inclined section 32 of the tongue 30 , and the air outlet end 52 of the noise reduction air gap 50 is disposed at the inwardly inclined section 31 of the tongue 30 .

[0033] like Figure 6 As shown, in this example, the air inlet end 51 of the noise reduction air gap 50 is disposed at the tongue flange 33 of the tongue portion 30 , and the air outlet end 52 of the noise reduction air gap 50 is disposed at an outer wall of the volute side plate 11 adjacent to the air outlet 21 .

[0034] like Figure 4 and Figure 5 As shown, in this example, the curved channel 53 of the noise reduction air gap 50 is configured as a Tesla valve. The advantage of configuring the curved channel 53 as a Tesla valve in this example is that the forward and reverse configurations of the Tesla valve can be utilized to achieve the desired flow rate slowing or acceleration effect, thereby helping to achieve the purpose of noise reduction.

[0035] Through the above structural composition and technical features, the centrifugal fan with tongue air gap disclosed by the utility model can be used in actual use. Figure 2 and Figure 3 As shown, through the morphological characteristics of the noise reduction air gap 50, when the centrifugal fan is working, the airflow generated by the rotation of the centrifugal blades 40 flows along the cavity 20 of the vortex side plate 11 to the tongue 30, and flows out through the air outlet 21. In this process, the side channel morphological characteristics formed by the noise reduction air gap 50 can destroy the structural conditions similar to the resonance cavity inside the centrifugal fan, thereby hindering the superposition of high-order harmonics and the formation of noise resonance, that is, destroying the wave superposition phenomenon caused by the air field wake on the surface of the vortex side plate 11 at the tongue 30, so that the intensity of the narrowband noise is reduced, and the noise at the air outlet 21 can be greatly reduced.

[0036] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A centrifugal fan with a tongue air gap, characterized in that: include: A housing having a vortex side plate and an air inlet, the vortex side plate having a cavity and an air outlet, a tongue portion formed on one side of the air outlet, the tongue portion comprising an inwardly inclined section, an outwardly inclined section and a tongue flange between the inwardly inclined section and the outwardly inclined section; a centrifugal fan blade, rotatably disposed in the cavity, with one side of the centrifugal fan blade being spaced apart from the inwardly inclined section of the tongue; A noise reduction air gap is arranged on the tongue in the form of a side channel. The noise reduction air gap includes an air inlet end, an air outlet end and a curved channel between the air inlet end and the air outlet end.

2. The centrifugal fan with a tongue air gap according to claim 1, characterized in that: The air inlet end of the noise reduction air gap is arranged at the outwardly inclined section of the tongue, and the air outlet end of the noise reduction air gap is arranged at the inwardly inclined section of the tongue.

3. The centrifugal fan with tongue air gap according to claim 1, characterized in that: The air inlet end of the noise reduction air gap is arranged at the tongue flange of the tongue portion, and the air outlet end of the noise reduction air gap is arranged at an outer wall of the volute side plate adjacent to the air outlet.

4. The centrifugal fan with tongue air gap according to claim 1, characterized in that: The curved channel of the noise reduction air gap is configured in a Tesla valve configuration.

5. The centrifugal fan with tongue air gap according to claim 4, characterized in that: The noise reduction air gap configured as a Tesla valve is in a forward or reverse configuration to achieve flow acceleration or deceleration effects.

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