Cross flow fan with noise reduction function

Abstract

This utility model discloses a cross-flow fan with noise reduction function, including a shell, an impeller, and a motor. The motor is installed in the impeller, and the stator of the motor is assembled and fixed to the shell. At least one end of the shell has an air inlet, which faces the end face of the impeller. The side of the shell has an air outlet, which communicates with the space where the impeller is located. A silencer is installed inside the impeller at a position opposite to the air inlet. The surface of the silencer is arc-shaped, and each arc-shaped surface of the silencer faces the air inlet direction. In this way, the arc shape of the silencer reduces the resistance to the air inlet, significantly reducing the noise at the air inlet end, thereby reducing the noise of the entire fan during operation. On both sides of the air outlet of the shell, sound-absorbing baffles extending towards the middle are respectively provided. The sound-absorbing baffles cover the gap between the two sides of the air outlet and the two ends of the impeller, thereby blocking the shearing sound of the returning airflow entering the gap of the impeller, reducing the noise generated therefrom, and further reducing the noise of the fan.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a cross-flow fan mainly used in automotive air conditioning, new energy industry, industrial control, server, game console equipment, home appliances and other products. Background Technology

[0002] A cross-flow fan, also known as a cross-flow exhaust fan, consists of an impeller and a casing. The impeller is a multi-bladed, elongated cylindrical shape with forward-curving multi-bladed blades. The casing has air inlets at both ends and air outlets on the sides. When the impeller rotates, airflow enters the impeller through the inlets, passes through the gaps between the blades, and exits through the outlets, forming the working airflow. This type of cross-flow fan has advantages such as low noise, uniform airflow, and high flexibility in axial length. Therefore, cross-flow fans are used in many products, such as air conditioners, power supplies, industrial control systems, servers, and industrial equipment. However, current cross-flow fans have the following problems: First, the air inlets at both ends are directly connected to the motor end face and stator support end face of the impeller. Both end faces are relatively flat structures. When the load is large, the high-speed airflow directly impacts these relatively flat end faces, which will generate greater noise due to the large wind resistance, thus increasing the operating noise of the fan. Second, the air outlet of the casing extends straight to the side. When the exhaust airflow encounters an object in front of the air outlet (such as the equipment casing), part of it will flow back towards the air outlet. This part of the backflowing airflow will penetrate into the gap between the inner walls on both sides of the air outlet and the two ends of the impeller. This will also generate a lot of noise, further increasing the noise of the fan during operation. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a cross-flow fan with a more rational structural design that reduces noise generated by the impact of the inlet air on the impeller under high load and the noise generated by the return airflow entering the inlet.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a cross-flow fan with noise reduction function, comprising a shell, a fan wheel and a motor, wherein the motor is installed in the fan wheel and the stator of the motor is assembled and fixed to the shell; at least one end of the shell has an air inlet, which is opposite to the end face of the fan wheel; the side of the shell has an air outlet, which is connected to the space where the fan wheel is located; a soundproof cover is installed inside the fan wheel at a position opposite to the air inlet, the surface of the soundproof cover is an arc-shaped structure, and the arc-shaped surface of the soundproof cover faces the air inlet direction.

[0005] Furthermore, there are air inlets at both ends of the outer casing, and silencers are installed inside the two ends of the impeller, namely the first silencer and the second silencer. The surfaces of the first silencer and the second silencer are both arc-shaped structures, and the first silencer and the second silencer face the air inlet direction with their respective arc-shaped surfaces.

[0006] Furthermore, the first silencer is installed on the outside of the motor housing, covering the outer end face of the motor from the outside, and forming a structure in which the first silencer rotates synchronously with the impeller.

[0007] Furthermore, the stator of the motor is assembled and fixed to the housing via a stator bracket, and the second silencer is installed on the stator bracket, so that the stator of the motor and the second silencer are opposite each other, and the second silencer covers the outer surface of the stator bracket from the outside.

[0008] Furthermore, several heat dissipation holes are provided on the motor housing, and plug pins are provided inside the first noise muffler. The number of heat dissipation holes is greater than the number of plug pins. The first noise muffler is assembled and fixed to the motor by inserting the plug pins into the heat dissipation holes.

[0009] Furthermore, several connecting ribs are provided inside the first silencer cover, which connect the plug-in foot and the inner wall of the first silencer cover into a single structure.

[0010] Furthermore, several countersunk holes are provided on the surface of the second muffler, and the second muffler can be assembled and fixed with the stator bracket by screwing screws into the countersunk holes, with the screws sinking into the countersunk holes.

[0011] Furthermore, two sound-absorbing baffles are installed on both sides of the air outlet of the outer casing. The two sound-absorbing baffles extend towards the middle of the air outlet and cover the gaps between the two ends of the impeller and the two sides of the air outlet. Neither of the two sound-absorbing baffles covers the blades of the impeller, so as to avoid obstructing the air outlet.

[0012] More preferably, the surfaces of both the first and second silencers are spherical structures, and can be made into a hemispherical shape.

[0013] This invention features a sound-absorbing cover with an arc-shaped surface installed in the impeller. The arc shape of the cover reduces resistance to the air intake, significantly reducing noise at the air intake end and thus lowering the overall noise of the fan during operation. Furthermore, sound-absorbing baffles extending towards the center are installed on both sides of the air outlet of the outer casing. These baffles cover the gaps between the air outlet sides and the ends of the impeller, preventing the return airflow from entering the gaps on both sides of the impeller and generating shearing noise, thereby reducing the overall fan noise. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural view of the present invention from another angle;

[0016] Figure 3 This is a side view of the present invention.

[0017] Figure 4This is a structural diagram of the present invention after the outer shell has been removed;

[0018] Figure 5 This is a structural diagram of the present invention after the outer shell and impeller have been removed;

[0019] Figure 6 This is an exploded view of the first noise muffler and the motor.

[0020] Figure 7 This is an exploded structural diagram of the second noise-reducing cover and the stator support;

[0021] Figure 8 This is a structural diagram of the first silencer.

[0022] In the diagram, 1 is the outer casing, 11 is the air inlet, 12 is the air outlet, 13 is the sound-absorbing baffle, 2 is the impeller, 3 is the motor, 31 is the heat dissipation hole, 4 is the stator bracket, 5 is the first sound-absorbing cover, 51 is the plug-in pin, 52 is the connecting rib, 6 is the second sound-absorbing cover, and 61 is the countersunk hole. Detailed Implementation

[0023] In this embodiment, refer to Figures 1-8 The noise-reducing cross-flow fan includes a housing 1, an impeller 2, and a motor 3. The motor 3 is installed in the impeller 2, and the stator of the motor 3 is assembled and fixed to the housing 1 via a stator bracket 4. The housing 1 has air inlets 11 at both ends, which are opposite to the two ends of the impeller 2. The housing 1 has an air outlet 12 on its side, which communicates with the space containing the impeller 2. Silencing covers, namely a first silencer 5 and a second silencer 6, are installed inside both ends of the impeller 2. The surfaces of both the first silencer 5 and the second silencer 6 are arc-shaped, and both face the air inlet direction with their respective arc-shaped surfaces. The incoming airflow first impacts the first silencer 5 and the second silencer 6, and the arc-shaped surfaces of the two silencers guide the airflow, thereby reducing the noise generated by the airflow impact. Of course, the technology of reducing wind resistance and wind noise through curved surface (streamlined) structure is widely used in products in many fields such as transportation vehicles. It is an existing technology. Therefore, the specific noise reduction principle will not be described in detail in this utility model.

[0024] The first silencer 5 is installed on the outside of the motor 3 housing, covering the outer end face of the motor 3 from the outside, and forming a structure in which the first silencer 5 rotates synchronously with the impeller 2. This can prevent the incoming air from directly impacting the outer end face of the motor 3 and generating large noise.

[0025] The stator of motor 3 is assembled and fixed to the housing 1 via stator bracket 4. The second silencer 6 is installed on stator bracket 4, so that the stator of motor 3 and the second silencer 6 are opposite each other, and the second silencer 6 covers the outer surface of stator bracket 4 from the outside. This can prevent the incoming air from directly impacting the outer end plane of stator bracket 4 and generating large noise.

[0026] Several heat dissipation holes 31 are provided on the housing of the motor 3, and plug pins 51 are provided inside the first muffler 5. The number of heat dissipation holes 31 is greater than the number of plug pins 51, so that some heat dissipation holes 31 can be left for heat dissipation. The first muffler 5 and the motor 3 are assembled and fixed by inserting the plug pins 51 into the heat dissipation holes 31. The installation and disassembly are very convenient.

[0027] Several connecting ribs 52 are provided inside the first silencer 5, which connect the plug-in foot 51 and the inner wall of the first silencer 5 into a single structure. This can improve the structural strength of the first silencer 5 and the plug-in foot 51 and prevent damage during high-speed rotation.

[0028] Several countersunk holes 61 are provided on the surface of the second silencer 6. The second silencer 6 is assembled and fixed with the stator bracket 4 by screwing screws into the countersunk holes 61. The screws are recessed into the countersunk holes 61, thus avoiding noise caused by air entering and hitting the screws.

[0029] The air outlet 12 of the outer casing 1 is provided with two sound-absorbing baffles 13 on both sides. The two sound-absorbing baffles 13 extend towards the middle of the air outlet 12 and block the gaps between the two ends of the impeller 2 and the two sides of the air outlet 12. In this way, the sound-absorbing baffles 13 can block the airflow generated by the resistance when it encounters the object in front of it and the return airflow enters through the gap between the two ends of the impeller 2 and the two sides of the air outlet 12, thereby reducing the noise generated. Neither of the two sound-absorbing baffles 13 blocks the blades of the impeller 2, so as to avoid obstructing the airflow.

[0030] The surfaces of the first silencer 5 and the second silencer 6 are both spherical structures and can be made into hemispherical shapes.

[0031] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A cross-flow fan with noise reduction function, comprising a casing, an impeller, and a motor, wherein the motor is installed in the impeller, and the stator of the motor is fixedly assembled to the casing; at least one end of the casing has an air inlet facing the end face of the impeller; the side of the casing has an air outlet communicating with the space where the impeller is located, characterized in that: A silencer is installed inside the wind turbine, opposite the air inlet. The silencer has an arc-shaped surface, with its arc-shaped surface facing the air inlet direction.

2. The cross-flow fan having a noise reduction function according to claim 1, characterized by: The outer casing has air inlets at both ends, and silencers are installed inside the two ends of the impeller, namely the first silencer and the second silencer. The surfaces of the first silencer and the second silencer are arc-shaped, and the arc-shaped surfaces of the first silencer and the second silencer face the air inlet direction.

3. The cross-flow fan having a noise reduction function according to claim 2, characterized by: The first silencer is installed on the outside of the motor housing, covering the outer end face of the motor from the outside, and forming a structure that rotates synchronously with the impeller.

4. The cross-flow fan having a noise reduction function according to claim 2, characterized by: The stator of the motor is assembled and fixed to the housing via a stator bracket. The second silencer is installed on the stator bracket, so that the stator of the motor and the second silencer are opposite each other, and the second silencer covers the outer surface of the stator bracket from the outside.

5. The cross-flow fan having a noise reduction function according to claim 3, characterized by: Several heat dissipation holes are provided on the motor housing, and plug pins are provided inside the first noise muffler. The number of heat dissipation holes is greater than the number of plug pins. The first noise muffler is assembled and fixed to the motor by inserting the plug pins into the heat dissipation holes.

6. The cross-flow fan having a noise reduction function according to claim 5, characterized by: Several connecting ribs are provided inside the first silencing cover, which connect the plug-in foot and the inner wall of the first silencing cover into a whole structure.

7. The cross-flow fan having a noise reduction function according to claim 4, characterized by: Several countersunk holes are provided on the surface of the second muffler. The second muffler is assembled and fixed to the stator bracket by screwing screws into the countersunk holes. The screws are recessed into the countersunk holes.

8. The cross-flow fan with noise reduction function according to claim 1, characterized in that: Silencing baffles are installed on both sides of the air outlet of the outer casing. The two baffles extend towards the middle of the air outlet and cover the gaps between the two ends of the impeller and the two sides of the air outlet. Neither baffle covers the blades of the impeller.

9. The cross-flow fan with noise reduction function according to claim 2, characterized in that: Both the first and second silencers have spherical surfaces.

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