TWM620315U - Centrifugal fan noise reduction structure - Google Patents

Abstract

A centrifugal fan noise reduction structure includes: a frame, a fixed sub-group, a rotor group, and an accommodating space; the frame has an upper cover, a lower cover and a frame wall, and the upper cover is provided with a flow channel, Both ends of the flow channel are provided with an inlet and an outlet. The upper and lower covers and the frame wall jointly define an accommodating space and are connected with an air outlet and an air inlet. The accommodating space defines a high pressure area and a low pressure Zone, the inlet of the flow channel is set relative to the high pressure zone, and the outlet of the flow channel is set relative to the low pressure zone; the stator assembly is set in the accommodating space and fixed on one side of the lower cover; The rotor group is arranged corresponding to the stator group, and the air flow can be guided through the flow channel to spray from the high-pressure area to the low-pressure area, thereby achieving the effect of fan noise reduction.

Description

Centrifugal fan noise reduction structure

A centrifugal fan noise reduction structure, in particular, a centrifugal fan noise reduction structure that is provided with a flow channel through an upper cover to guide airflow to spray at a low pressure, thereby achieving a noise reduction effect.

The noise reduction structure of centrifugal fans includes centrifugal fans, centrifugal compressors, centrifugal blowers, centrifugal water pumps, etc., because they can change the direction of airflow (inlet and outlet have different directions) and can be improved by centrifugal force. Many pressure increases, high space applicability (suitable for small spaces such as notebook computers for heat dissipation) and simple structure. It has a very wide range of applications in life around 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 water towers, etc. Also, because the noise reduction structure of centrifugal fan is a common device in life, the noise it generates during operation is the most criticized and unacceptable. Therefore, it is urgent to improve the noise problem of this type of centrifugal fan noise reduction structure. Generally, the noise reduction method of the centrifugal fan noise reduction structure is mostly by optimizing the structure design, such as adjusting the blade shape, air inlet geometry, volute style, throat clearance design, adding diversion structure, etc., or active external noise reduction or Sound insulation device. The disadvantage of the conventional optimized structure design is that the applicable range is small, and the partially optimized structure design is difficult to be widely used. Often, as soon as the environmental operating conditions are changed, many optimized structure parameters need to be restarted; and the noise reduction device is added. The disadvantage is that it greatly increases material and manufacturing costs and takes up space. Therefore, how to solve the deficiencies caused by the conventional technology is the primary goal of those skilled in the art.

Therefore, in order to effectively solve the above-mentioned problems, the main purpose of this creation is to provide a way to guide the airflow to the low-pressure area by setting up a flow channel on either or both of the upper and lower covers of the fan, thereby achieving a reduction in pressure. The effect of noise. In order to achieve the above purpose, this creation provides a centrifugal fan noise reduction structure, which includes: a frame, a fixed sub-group, and a rotor group; The frame body is composed of an upper cover, a lower cover and a frame wall. The upper cover is provided with a flow channel, and both ends of the flow channel are provided with an inlet and an outlet. The upper and lower covers and the frame wall jointly define a The accommodating space is connected to an air outlet and an air inlet. A high pressure zone and a low pressure zone are defined in the accommodating space. The inlet of the flow channel is arranged relative to the high pressure zone. The outlet is arranged relative to the low pressure zone; the stator group is arranged in the accommodating space and fixed on the side of the lower cover; the rotor group is arranged corresponding to the stator group. In order to achieve the above purpose, this creation provides a centrifugal fan noise reduction structure, which includes: a frame, a fixed sub-group, and a rotor group; The frame body is composed of an upper cover, a lower cover and a frame wall. The upper cover is provided with a first flow channel, the lower cover has a second flow channel, and both ends of the first flow channel are provided with a first inlet and A first outlet. A second inlet and a second outlet are provided at both ends of the second flow channel. The upper and lower covers and the frame wall jointly define an accommodating space, and are connected with an air outlet and a first air inlet. A second air inlet, a high pressure zone and a low pressure zone are defined in the accommodating space, the first and second inlets of the first and second flow channels are arranged relative to the high pressure zone, and the first and second flow channels are One and two outlets are arranged relative to the low-pressure zone; the stator group is arranged in the accommodating space and fixed on the side of the lower cover one; the rotor group is arranged corresponding to the stator group. Through the creation of this invention, the flow channel can be arranged on either or both of the upper and lower covers of the frame to guide the airflow in the high-pressure area to spray to the low-pressure area of the fan, thereby achieving the effect of reducing the noise of the fan.

The above-mentioned purpose of this creation and its structural and functional characteristics will be described based on the preferred embodiments of the accompanying drawings. Please refer to Figures 1 and 2, which are the three-dimensional exploded and combined cross-sectional views of the first embodiment of the centrifugal fan noise reduction structure of this creation. As shown in the figure, the centrifugal fan noise reduction structure of this creation includes: a frame 11, A stator group 12, a rotor group 13; The frame 11 has an upper cover 111, a lower cover 112, and a frame wall 114. The upper cover 111 is provided with a flow channel 113, and both ends of the flow channel 113 are provided with an inlet 1131 and an outlet 1132. The lower cover A frame wall 114 hangs down from the outer edge of the 112 side. The upper and lower covers 111, 112 and the frame wall 114 jointly define an accommodating space 115, and are connected to an air outlet 116 and an air inlet 117. The air outlet 116 is provided with On the side of the lower cover 112, the air inlet 117 is provided on the upper cover 111 and corresponding to the rotor assembly 13. The accommodating space 115 defines a high-pressure zone 1151 and a low-pressure zone 1152. The high-pressure zone 1151 is located far away from the rotor assembly 13 and close to the frame wall 114 of the lower cover 112, and the low-pressure zone 1152 is located close to the frame wall 114 of the lower cover 112. At the rotor assembly 13, the inlet 1131 of the flow channel 113 is set relative to the high pressure zone 1151, and the outlet 1132 of the flow channel 113 is set relative to the low pressure zone 1152. The stator assembly 12 is arranged in the accommodating space 115 and fixed on one side of the lower cover 112. The stator assembly 12 has a plurality of silicon steel sheets 121 and a circuit board 122. The silicon steel sheets 121 are stacked and wound on the outside. A plurality of coils 123 are provided, and the coils 123 are electrically connected to the circuit board 122. The rotor assembly 13 is arranged corresponding to the stator assembly 12. The rotor assembly 13 has a hub 131, and the outer edge of the hub 131 extends toward a disc portion 132, and the disc portion 132 is provided with a plurality of fan blades 133. The inner edge of the hub 131 is provided with a magnetic body 134, and an axis 135 is perpendicular to the inner end surface of the hub 131. The magnetic body 134 corresponds to the silicon steel sheets 121 to induce stress magnets. A shaft tube 14 is vertically arranged on one side of the lower cover 112. The shaft tube 14 is provided with at least one bearing 15 and has a shaft hole 151. The shaft core 135 is inserted into the shaft hole 151. The silicon steel sheets 121 and the circuit board 122 are sleeved on the outer edge of the shaft cylinder 14. This embodiment mainly uses a centrifugal fan as an illustrative embodiment. The flow passage 113 in the frame 11 of this embodiment has an inlet 1131 located in the high pressure zone 1151 radially outside of the upper cover 111, and an outlet 1132 located in the low pressure zone 1152 of the throat of the upper cover 111 , The entire flow channel 113 structure is arranged in the upper cover 111. The position of the jet from the outlet 1132 is at the gap between the side frame wall 114 and the throat of the rotor assembly 13, where the jet can improve the return zone of the throat (as shown in Figure 1), and reduce the pressure fluctuation of the flow field in this zone. noise. That is, the inlet 1131 of the flow channel 113 is set relative to the high pressure zone 1151, and the outlet 1132 of the flow channel 113 is set relative to the low pressure zone 1152. When the fan blades 133 of the rotor group 13 are operating, the airflow is forced to enter the high and low pressures. Area 1151, 1152 guide, the air flow forced by the rotor group 13 enters the flow channel 113 from the inlet 1131 of the flow channel 113 and then is discharged to the outlet 1132 of the flow channel 113, thereby the low pressure zone 1152 of the rotor group 13 Perform jet flow to achieve the effect of noise reduction. The flow channel 113 can be selected to be provided on the upper cover 111 or the lower cover 112, or the flow channel 113 can be provided on the upper cover 111 and the lower cover 112 at the same time (not shown in the figure) In this embodiment, the flow channel 113 is provided on the upper cover 111 as an illustrative embodiment, but it is not limited to it. Please refer to Figure 3, which is a combined cross-sectional view of the second embodiment of the created centrifugal fan noise reduction structure. As shown in the figure, part of the structure of this embodiment is the same as the foregoing first embodiment, so it will not be repeated here. The difference between this embodiment and the foregoing first embodiment is that the flow channel 113 is a tube body 2, and the tube body 2 is selectively inserted into the upper cover 111 or the lower cover 112, or inserted into the upper and lower covers at the same time. 111, 112, and the tube body 2 and the upper and lower covers 111, 112 are a non-integrated combination structure. In this embodiment, the tube body 2 is inserted into the upper cover 111 as an illustrative embodiment, but It is not limited. In the foregoing first and second embodiments, the number of the flow channels 113 may be plural, and the shape of the outlet and inlet 1132, 1131 is any one of circular, square, elongated, and trapezoidal. The shapes of 113 and the exit and entrance 1132 and 1131 are the same or different. Traditional centrifugal fan noise reduction structure (such as centrifugal fan, centrifugal compressor, centrifugal blower, centrifugal water pump, etc.) This creation is based on the centrifugal fan as an illustrative embodiment, and the design is designed on the upper or lower cover of the centrifugal fan The flow channel (flow channel) structure, when the rotor is running, the pressure difference between the two sides of the flow channel structure is naturally formed due to the characteristics of the rotating machinery, so that the airflow flows from the high pressure area through the flow channel to the low pressure area, forming the effect of self-natural jet flow. Since the noise is mainly caused by pressure fluctuations in the fluid, this self-jet method can accurately control the uneven low-pressure zone or low-speed zone in the rotor group, and reduce the pressure fluctuations of the fluid at the place to reduce the noise. Due to the structure of the centrifugal rotor group and the volute (frame) will produce uneven low pressure/low speed area, the main noise occurrence location is often in fixed areas, such as the fan blade trailing edge near the exit area, throat area, upper and lower covers Therefore, the noise reduction method using self-generating jets in this creation can be widely used in different centrifugal designs and operating conditions. In addition, most of the upper and lower cover structures of the centrifugal fan noise reduction structure are made of metal parts, so it is quite simple to increase the flow channel structure on the inner side. The noise reduction method of this creation has a wide range of applications, no additional equipment, no complicated structural design, and a simple flow channel structure can improve the eddy current, secondary flow and other problematic flow fields between the rotor group and the frame, except for Increase the characteristics and reduce noise.

11: Frame 111: upper cover 112: lower cover 113: Runner 1131: entrance 1132: exit 114: Frame Wall 115: accommodating space 1151: High Pressure Zone 1152: low pressure area 116: air outlet 117: Air inlet 12: stator group 121: Silicon steel sheet 122: circuit board 123: Coil 13: Rotor group 131: Wheel Hub 132: plate 133: Fan Blade 134: Magnetic 135: Axis 14: Axle tube 15: Bearing 151: Shaft hole 2: Tube body

Figure 1 is a three-dimensional exploded view of the first embodiment of the created centrifugal fan noise reduction structure; Figure 2 is a combined cross-sectional view of the first embodiment of the created centrifugal fan noise reduction structure; Figure 3 is a combined cross-sectional view of the second embodiment of the created centrifugal fan noise reduction structure;

11: Frame

111: upper cover

112: lower cover

113: Runner

1131: entrance

1132: exit

114: Frame Wall

115: accommodating space

1151: High Pressure Zone

1152: low pressure area

117: Air inlet

12: stator group

121: Silicon steel sheet

122: circuit board

123: Coil

13: Rotor group

131: Wheel Hub

132: plate

133: Fan Blade

134: Magnetic

135: Axis

14: Axle tube

15: Bearing

Claims (6)

A centrifugal fan noise reduction structure, which contains: A frame body has an upper cover, a lower cover and a frame wall. Either or both of the upper and lower covers are provided with a flow channel, and both ends of the flow channel are provided with an inlet and an outlet. The upper and lower covers and The frame wall jointly defines an accommodating space and is connected with an air outlet and an air inlet. A high pressure zone and a low pressure zone are defined in the accommodating space, and the inlet of the flow channel is arranged relative to the high pressure zone. The outlet of the flow channel is set relative to the low pressure area; The fixed sub-group is arranged in the accommodating space and fixed on one side of the lower cover; A rotor group is arranged corresponding to the stator group. According to the noise reduction structure of the centrifugal fan described in item 1 of the scope of patent application, the air outlet is provided on the side of the lower cover, and the air inlet is provided on the upper cover and corresponding to the rotor group. According to the noise reduction structure of the centrifugal fan described in item 1 of the scope of patent application, the high-pressure zone is arranged far away from the rotor group and close to the frame wall of the lower cover, and the low-pressure zone is arranged close to the rotor group. According to the noise reduction structure of the centrifugal fan described in item 1 of the scope of patent application, wherein the rotor assembly has a hub, and the outer edge of the hub extends toward a disk portion, the disk portion is provided with a plurality of blades, and the inner edge of the hub is provided There is a magnetic body. An axis is perpendicular to the inner end of the hub. The stator set has a plurality of silicon steel sheets and a circuit substrate. The silicon steel sheets are stacked and are wound with a plurality of coils. Sexually connected, a shaft tube is perpendicular to one side of the lower cover, the shaft tube is provided with at least one bearing and has a shaft hole inside, the shaft center is inserted into the shaft hole, the silicon steel sheets of the stator assembly And the circuit substrate is sleeved on the outer edge of the shaft cylinder. According to the noise reduction structure of centrifugal fan described in item 1 of the scope of patent application, the number of said flow passages can be plural, and the shape of said outlet and inlet is any one of circular, square, elongated, and trapezoidal. The flow channel and the outlet and inlet shapes are the same or different. According to the noise reduction structure of the centrifugal fan described in item 1 of the scope of patent application, the flow channel and the upper cover are integrally or non-integrally arranged.

Images