阅读说明：本技术 离心风扇降噪结构 (Noise reduction structure of centrifugal fan ) 是由 陈佑慈 王仲澍 于 2021-09-01 设计创作，主要内容包括：本发明提供一种离心风扇降噪结构,包含：一框体、一定子组、一转子组、一容置空间；该框体具有一上盖、一下盖及一框壁所构成,该上盖设置有一流道,该流道的两端设置有一入口及一出口,该上、下盖与框壁共同界定一容置空间并连接一出风口及一入风口,该容置空间内定义一高压区及一低压区,所述流道的该入口系相对该高压区设置,所述流道的出口则相对于该低压区设置；该定子设置于容置空间内并固设于该下盖的一侧；该转子组与该定子组相对应设置,通过该流道可引导气流由该高压区向低压区处进行喷流,如此达到风扇降噪的功效。(The invention provides a noise reduction structure of a centrifugal fan, comprising: a frame body, a stator group, a rotor group and a containing space; the frame body is provided with an upper cover, a lower cover and a frame wall, the upper cover is provided with a flow channel, two ends of the flow channel are provided with an inlet and an outlet, the upper cover, the lower cover and the frame wall jointly define an accommodating space and are connected with an air outlet and an air inlet, a high-pressure area and a low-pressure area are defined in the accommodating space, the inlet of the flow channel is arranged relative to the high-pressure area, and the outlet of the flow channel is arranged relative to the low-pressure area; the stator is arranged in the accommodating space and fixedly arranged on one side of the lower cover; the rotor set and the stator set are arranged correspondingly, and the air flow can be guided to jet from the high-pressure area to the low-pressure area through the flow channel, so that the effect of reducing the noise of the fan is achieved.)

1. A noise reducing structure for a centrifugal fan, comprising:

the frame body is provided with an upper cover, a lower cover and a frame wall, a flow channel is arranged on any one of the upper cover and the lower cover or on the lower cover, an inlet and an outlet are arranged at two ends of the flow channel, the upper cover, the lower cover and the frame wall jointly define an accommodating space, the accommodating space is connected with an air outlet and an air inlet, a high-pressure area and a low-pressure area are defined in the accommodating space, the inlet of the flow channel is arranged relative to the high-pressure area, and the outlet of the flow channel is arranged relative to the low-pressure area;

a stator group which is arranged in the accommodating space and fixedly arranged on one side of the lower cover;

a rotor set corresponding to the stator set.

2. The noise reducing structure of a centrifugal fan according to claim 1, wherein: the air outlet is arranged on the side edge of the lower cover, and the air inlet is arranged on the upper cover and corresponds to the rotor set.

3. The noise reducing structure of a centrifugal fan according to claim 1, wherein: the high-pressure area is arranged on the frame wall far away from the rotor set and close to the lower cover, and the low-pressure area is arranged close to the rotor set.

4. The noise reducing structure of a centrifugal fan according to claim 1, wherein: the rotor set is provided with a hub, a disc portion extends towards the outer edge of the hub, the disc portion is provided with a plurality of fan blades, a magnetic body is arranged on the inner edge of the hub, an axis is vertically arranged on the end face of the inner side of the hub, the stator set is provided with a plurality of silicon steel sheets and a circuit substrate, the plurality of silicon steel sheets are stacked and externally wound with a plurality of coils, the plurality of coils are electrically connected with the circuit substrate, a shaft cylinder is vertically arranged on one side of the lower cover, at least one bearing is arranged inside the shaft cylinder and provided with a shaft hole, the axis is inserted into the shaft hole, and the plurality of silicon steel sheets and the circuit substrate of the stator set are sleeved on the outer edge of the shaft cylinder.

5. The noise reducing structure of a centrifugal fan according to claim 1, wherein: the flow passages are in a plurality of numbers, the shape of the outlet and the inlet is any one of round, square, long strip and trapezoid, and the flow passages and the shape of the outlet and the inlet are the same or different.

6. The noise reducing structure of a centrifugal fan according to claim 1, wherein: the runner and the upper cover are arranged integrally or non-integrally.

Technical Field

The present invention relates to a noise reduction structure of a centrifugal fan, and more particularly, to a noise reduction structure of a centrifugal fan, which has a flow channel formed on an upper cover or a lower cover to guide an air flow to jet at a low pressure, thereby achieving a noise reduction effect.

Background

The centrifugal noise reduction structure comprises a centrifugal fan, a centrifugal compressor, a centrifugal blower, a centrifugal water pump and the like, and can change the direction of air flow (the air inlet and the air outlet have different directions) and obtain more pressure lifting under the action of centrifugal force, so that the centrifugal noise reduction structure is high in space applicability (suitable for narrow spaces such as notebook computer heat dissipation) and simple in structure, and has very wide application in life surroundings such as: notebook computers, hair dryers, vacuum cleaners, bathroom exhaust fans, kitchen exhaust fans, air conditioning or related ventilation systems for vehicle engines, industrial equipment, cooling towers, and the like. Since the noise reduction structure of the centrifugal fan is a common device in life, noise generated in the operation process is the most offensive and unacceptable, and therefore, the problem of improving the noise of the noise reduction structure of the centrifugal fan is urgently needed.

The general noise reduction method of the centrifugal fan noise reduction structure mostly relies on optimizing the structural design, such as adjusting the shape of blades, the geometry of an air inlet, the pattern of a volute, the design of a throat gap, adding a flow guide structure and the like, or actively adding a noise elimination or sound insulation device. The existing optimized structural design has the defects that the applicable range is small, the locally optimized structural design is difficult to be comprehensively and widely used, and a plurality of optimized structural parameters need to be repeatedly made once the environmental operation condition is changed; the additional muffler has the disadvantages of greatly increasing the material and manufacturing cost and occupying space.

Therefore, how to solve the deficiency caused by the prior art is the primary objective of those skilled in the art.

Disclosure of Invention

Therefore, to effectively solve the above problems, the main objective of the present invention is to provide a method for guiding airflow to jet flow to a low pressure region by providing a flow channel on either or both of the upper and lower covers of the fan, so as to achieve the effect of noise reduction.

To achieve the above object, the present invention provides a noise reduction structure for a centrifugal fan, comprising:

the frame body is provided with an upper cover, a lower cover and a frame wall, a flow channel is arranged on any one of the upper cover and the lower cover or on the lower cover, an inlet and an outlet are arranged at two ends of the flow channel, the upper cover, the lower cover and the frame wall jointly define an accommodating space, the accommodating space is connected with an air outlet and an air inlet, a high-pressure area and a low-pressure area are defined in the accommodating space, the inlet of the flow channel is arranged relative to the high-pressure area, and the outlet of the flow channel is arranged relative to the low-pressure area;

a stator group which is arranged in the accommodating space and fixedly arranged on one side of the lower cover;

a rotor set corresponding to the stator set.

The centrifugal fan noise reduction structure, wherein: the air outlet is arranged on the side edge of the lower cover, and the air inlet is arranged on the upper cover and corresponds to the rotor set.

The centrifugal fan noise reduction structure, wherein: the high-pressure area is arranged on the frame wall far away from the rotor set and close to the lower cover, and the low-pressure area is arranged close to the rotor set.

The centrifugal fan noise reduction structure, wherein: the rotor set is provided with a hub, a disc portion extends towards the outer edge of the hub, the disc portion is provided with a plurality of fan blades, a magnetic body is arranged on the inner edge of the hub, an axis is vertically arranged on the end face of the inner side of the hub, the stator set is provided with a plurality of silicon steel sheets and a circuit substrate, the plurality of silicon steel sheets are stacked and externally wound with a plurality of coils, the plurality of coils are electrically connected with the circuit substrate, a shaft cylinder is vertically arranged on one side of the lower cover, at least one bearing is arranged inside the shaft cylinder and provided with a shaft hole, the axis is inserted into the shaft hole, and the plurality of silicon steel sheets and the circuit substrate of the stator set are sleeved on the outer edge of the shaft cylinder.

The centrifugal fan noise reduction structure, wherein: the flow passages are in a plurality of numbers, the shape of the outlet and the inlet is any one of round, square, long strip and trapezoid, and the flow passages and the shape of the outlet and the inlet are the same or different.

The centrifugal fan noise reduction structure, wherein: the runner and the upper cover are arranged integrally or non-integrally.

The invention arranges the flow channel on one or two of the upper and lower covers of the frame body to guide the air in the high pressure area to flow to the low pressure area of the fan for jet flow, thus achieving the effect of reducing noise of the fan.

Drawings

FIG. 1 is an exploded perspective view of a first embodiment of a noise reducing structure for a centrifugal fan in accordance with the present invention;

FIG. 2 is a combined cross-sectional view of a first embodiment of a noise reducing structure for a centrifugal fan according to the present invention;

fig. 3 is a combined sectional view of a noise reducing structure of a centrifugal fan according to a second embodiment of the present invention.

Description of reference numerals: a frame body 11; an upper cover 111; a lower cover 112; a flow passage 113; an inlet 1131; an outlet 1132; the frame wall 114; an accommodating space 115; a high pressure zone 1151; a low-pressure region 1152; an air outlet 116; an air inlet 117; a stator group 12; a silicon steel sheet 121; a circuit substrate 122; a coil 123; a rotor set 13; a hub 131; a disk portion 132; fan blades 133; a magnetic body 134; a shaft center 135; a shaft tube 14; a bearing 15; a shaft hole 151; a tubular body 2.

Detailed Description

The above objects, together with the structural and functional features thereof, are accomplished by the preferred embodiments according to the accompanying drawings.

Referring to fig. 1 and fig. 2, a three-dimensional exploded and assembled cross-sectional view of a noise reduction structure of a centrifugal fan according to a first embodiment of the present invention is shown, and the noise reduction structure of the centrifugal fan according to the present invention includes: a frame 11, a stator set 12, a rotor set 13;

the frame 11 has an upper cover 111, a lower cover 112 and a frame wall 114, the upper cover 111 has a flow channel 113, and two ends of the flow channel 113 are provided with an inlet 1131 and an outlet 1132, the outer edge of the side of the lower cover 112 is provided with a frame wall 114 in a perpendicular manner, the upper and lower covers 111, 112 and the frame wall 114 define a containing space 115 together and are connected to an air outlet 116 and an air inlet 117, the air outlet 116 is disposed on the side of the lower cover 112, and the air inlet 117 is disposed on the upper cover 111 and corresponds to the rotor assembly 13.

The accommodating space 115 defines a high pressure region 1151 and a low pressure region 1152, the high pressure region 1151 is disposed away from the rotor set 13 and close to the frame wall 114 of the lower cover 112, the low pressure region 1152 is disposed close to the rotor set 13, the inlet 1131 of the flow channel 113 is disposed opposite to the high pressure region 1151, and the outlet 1132 of the flow channel 113 is disposed opposite to the low pressure region 1152.

The stator assembly 12 is disposed in the accommodating space 115 and fixedly disposed on one side of the lower cover 112, the stator assembly 12 has a plurality of silicon steel sheets 121 and a circuit substrate 122, the silicon steel sheets 121 are stacked, a plurality of coils 123 are wound on the outside, and the coils 123 are electrically connected to the circuit substrate 122.

The rotor set 13 is disposed corresponding to the stator set 12, the rotor set 13 has a hub 131, a disc portion 132 extends from an outer edge of the hub 131, the disc portion 132 has a plurality of blades 133, a magnetic body 134 is disposed on an inner edge of the hub 131, an axial center 135 is disposed at an inner end surface of the hub 131, and the magnetic body 134 and the plurality of silicon steel sheets 121 are correspondingly induced and excited.

A shaft tube 14 is vertically disposed on one side of the lower cover 112, at least one bearing 15 and a shaft hole 151 are disposed inside the shaft tube 14, the shaft center 135 is inserted into the shaft hole 151, and the plurality of silicon steel sheets 121 and the circuit substrate 122 of the stator assembly 12 are sleeved on the outer edge of the shaft tube 14.

In this embodiment, a centrifugal fan is mainly used as an illustrative embodiment, the flow channel 113 in the frame 11 of this embodiment has an inlet 1131 located in a high pressure area 1151 at the radial outer side of the upper cover 111, and an outlet 1132 located in a low pressure area 1152 at the throat portion of the upper cover 111, and the whole flow channel 113 is structurally disposed in the upper cover 111. The jet of the outlet 1132 is located at the throat gap between the side frame wall 114 and the rotor set 13, where the jet can improve the recirculation region of the throat (see fig. 1), so that the flow field pressure fluctuation in this region is reduced and the noise is reduced.

That is, the inlet 1131 of the flow channel 113 is disposed opposite to the high pressure region 1151, the outlet 1132 of the flow channel 113 is disposed opposite to the low pressure region 1152, when the blades 133 of the rotor set 13 operate, the air flow is forced to enter the high and low pressure regions 1151, 1152, the air flow forced by the rotor set 13 enters the flow channel 113 through the inlet 1131 of the flow channel 113 and then is discharged to the outlet 1132 of the flow channel 113, so as to jet the low pressure region 1152 of the rotor set 13, thereby achieving the noise reduction effect, the flow channel 113 can be selectively disposed on the upper cover 111 or the lower cover 112, or the flow channel 113 (not shown) is disposed on both the upper cover 111 and the lower cover 112, in this embodiment, the flow channel 113 is disposed on the upper cover 111 as an illustrative embodiment, but not limited thereto.

Please refer to fig. 3, which is a combined cross-sectional view of a noise reduction structure of a centrifugal fan according to a second embodiment of the present invention, and as shown in the drawing, part of the structure of the embodiment is the same as that of the first embodiment, and therefore will not be described herein, but the difference between the embodiment and the first embodiment is that the flow channel 113 is a pipe 2, and the pipe 2 is selectively inserted into the upper cover 111 or the lower cover 112, or inserted into the upper and lower covers 111, 112 at the same time, and the pipe 2 and the upper and lower covers 111, 112 are in a non-integrated combined structure, and the embodiment inserts the pipe 2 into the upper cover 111 as an illustrative embodiment, but not limited thereto.

In the first and second embodiments, the number of the flow channel 113 may be plural, the inlet 1132 and the outlet 1131 may be any one of circular, square, elongated and trapezoidal, and the shapes of the flow channel 113 and the inlet 1132 and the outlet 1131 may be the same or different.

The invention relates to a noise reduction structure of a traditional centrifugal fan (such as a centrifugal fan, a centrifugal compressor, a centrifugal blower, a centrifugal water pump and the like). A flow channel (flow channel) structure is designed at an upper cover or a lower cover of the centrifugal fan, when a rotor runs, pressure difference is naturally formed at two sides of the flow channel structure due to the characteristics of rotating machinery, so that air flow flows from a high-pressure area to a low-pressure area through the flow channel, and the effect of self natural jet flow is formed. Since noise is mainly caused by pressure fluctuation in the fluid, the self-jetting method can accurately control uneven low-pressure areas or low-speed areas in the rotor set, and the noise is reduced by reducing the pressure fluctuation of the fluid.

Because the centrifugal rotor set and the volute (frame) structure can generate uneven low-pressure/low-speed areas, the main noise generating positions are usually in fixed areas, such as a near-outlet area of the tail edge of the fan blade, a throat area, a space between an upper cover and a lower cover and the fan blade, and the like, the self-jet noise reduction method can be widely applied to different centrifugal design and operating conditions.

In addition, the upper cover structure and the lower cover structure of the noise reduction structure of most centrifugal fans are made of metal parts, so that the structure of adding flow channels on the inner side is quite simple. The noise reduction method has wide application range, does not need additional equipment or complex structural design, can improve the flow fields with problems such as vortex, secondary flow and the like between the rotor set and the frame body by using a simple flow channel structure, can improve the characteristics and reduce the noise.