A centrifugal fan structure with low noise and high efficiency motor heat dissipation

Abstract

This invention discloses a low-noise and high-efficiency centrifugal fan structure for motor heat dissipation, including a conical centrifugal fan disk. Several centrifugal blades are arranged in a circular array along the axis on one side of the convex surface of the conical centrifugal fan disk. These blades are distributed in the central region of the conical centrifugal fan disk, forming a conical annular air guide without connecting blades at the edge region. As can be seen from the cloud diagram, the improved vortex exhibits reduced intensity and range, thus achieving the goal of reducing whistling noise.

Description

Technical Field

[0001] The invention belongs to the field of low-noise centrifugal fans. Background Art

[0002] like Figure 2 The left picture and Figure 3 It is based on a centrifugal fan before the improvement of this case and the fluid mechanics finite element analysis cloud map. Under this structure, the edge of the conical centrifugal fan disk does not have the conical ring-shaped air guide part of this case. From the cloud map, it can be seen that there are at least two large vortex areas with relatively large ranges in the wind shell. The greater the vortex intensity and range, the greater the vortex whistling sound formed, which causes the overall noise of the fan to be relatively large during operation. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a centrifugal fan structure with low noise and high efficiency motor heat dissipation, which has the functions of reducing noise and enhancing heat dissipation.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a low-noise and high-efficiency motor heat dissipation centrifugal fan structure, including a conical centrifugal fan disk, a convex side of the conical centrifugal fan disk is provided with a plurality of centrifugal blades distributed in a circular array along the axis, and the plurality of centrifugal blades are distributed in the central area of ​​the conical centrifugal fan disk, so that the edge area of ​​the conical centrifugal fan disk forms a conical ring-shaped air guide portion without connected blades.

[0005] Furthermore, the conical centrifugal fan disk is coaxially connected to a central head in a central integrated manner, and a plurality of centrifugal blades are distributed around the central head, and the plurality of centrifugal blades are vertically and integrally connected to the conical centrifugal fan disk.

[0006] Furthermore, a wind shell is coaxially arranged outside the conical centrifugal wind disk, and the wind shell includes an air intake cylinder section, a cone ring air guide section and a cylindrical air outlet section which are coaxially connected in an integrated manner.

[0007] Furthermore, a silencer disk is coaxially arranged within the enclosed range of the cylindrical air outlet section, a conical ring-shaped centrifugal wind bin is formed between the convex surface of the conical centrifugal air disk and the conical ring air guide section, an annular silencer chamber is formed between the silencer disk and the concave side of the conical centrifugal air disk; an annular air outlet gap is formed between the outer ring of the silencer disk and the inner wall of the cylindrical air outlet section.

[0008] Furthermore, the silencer disk is fixedly connected to the wind housing or other fixed components through a bracket, and a drive motor is fixedly installed on one side of the axis of the silencer disk close to the conical centrifugal wind disk, and the output shaft of the drive motor is fixedly connected to the central head coaxially.

[0009] Furthermore, each of the centrifugal blades is a hollow body with a cavity inside, and an end of each of the centrifugal blades away from the conical centrifugal fan disk is provided with an a-shaped hollow opening along the contour, and an end of each of the centrifugal blades close to the axis of the conical centrifugal fan disk is provided with a b-shaped hollow opening whose length direction is consistent with the direction of the axis of the conical centrifugal fan disk;

[0010] The internal cavity of the centrifugal blade runs through front and back along the axial direction of the conical centrifugal fan disk, and a fan blade extension piece is arranged in parallel and movably constrained in the internal cavity of each centrifugal blade, and one end of each fan blade extension piece away from the conical centrifugal fan disk passes through the a-shaped hollow opening to the outside of the centrifugal blade; a hollow channel is arranged at the axis of the central head, and an adjusting motor is fixedly installed coaxially with the bottom of the hollow channel, and the output end of the adjusting motor is driven and connected to a threaded transmission rod coaxial with the conical centrifugal fan disk, and the external thread of the threaded transmission rod is matched with an internal threaded ring body, and one end of each fan blade extension piece close to the axis of the conical centrifugal fan disk is fixedly connected to the internal threaded ring body through a connecting arm, and the internal threaded ring body cannot rotate along its own axis relative to the conical centrifugal fan disk under the matching relationship between the centrifugal blade and the fan blade extension piece; each connecting arm passes through the corresponding b-shaped hollow opening.

[0011] Furthermore, the outer edge of the columnar central head is provided with a chamfer; the end of the fan blade extension piece close to the conical centrifugal fan disk and close to the axis of the conical centrifugal fan disk is provided with a triangular notch;

[0012] When the fan blade extension piece is inside the centrifugal blade, an oblique air distribution channel is formed at the triangular notch inside the centrifugal blade;

[0013] One end of the oblique air distribution channel is connected to the annular muffler chamber, and the other end is connected to the central area of ​​the conical annular centrifugal wind bin through an air inlet formed at one end of the b-shaped hollow opening close to the chamfer.

[0014] Furthermore, as each fan blade extension piece gradually extends outward from the strip-shaped hollow opening, the width of the oblique air distribution channel also automatically widens accordingly.

[0015] Beneficial effect: The edge area of ​​the conical centrifugal fan disk of the present invention forms a conical ring-shaped air guide structure without connecting blades. From the cloud map, it can be seen that the improved vortex is reduced in both intensity and range, thereby achieving the purpose of reducing the whistling noise;

[0016] After increasing the exposed area of ​​each fan blade extension piece, the windward area of ​​each centrifugal blade is extended, so as to achieve the purpose of obtaining a stronger exhaust flow rate and intensity at the same speed; after the windward area of ​​each centrifugal blade is extended, as each fan blade extension piece gradually extends outward from the a-shaped hollow opening, the width of the oblique air distribution channel is automatically widened accordingly, thereby increasing the gas flow rate of the oblique air distribution channel, further enhancing the rate of replenishing fresh and relatively cold air into the annular silencer chamber, and further increasing the diffusion rate of heat in the annular silencer chamber, thereby achieving hedging and alleviating the problem of increased heat generation of the drive motor due to increased load. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 The overall structural diagram of this scheme is as follows:

[0018] Attached Figure 2 The finite element analysis model before and after improvement;

[0019] Attached Figure 3 This is the finite element analysis flow field cloud diagram before improvement;

[0020] Attached Figure 4 This is the finite element analysis flow field cloud diagram before improvement;

[0021] Attached Figure 5 This is a cross-sectional view of this scheme;

[0022] Attached Figure 6 For attachment Figure 5 The schematic diagram after the external wind shell is hidden on the basis;

[0023] Attached Figure 7 For attachment Figure 6 A cross-sectional view at the mark 27 of FIG.

[0024] Attached Figure 8 For the attached Figure 7 A schematic diagram of the windward area of ​​each centrifugal blade after being extended based on FIG.

[0025] Attached Fig. 9 For attachment Figure 6 Disassembly diagram of

[0026] Attached Fig.10 For attachment Fig. 9 Schematic diagram of the structure before disassembly. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] As attached Figures 1 to 10The centrifugal fan structure with low noise and high efficiency in motor heat dissipation comprises a conical centrifugal fan disc 5, and a plurality of centrifugal blades 6 are distributed in a circular array along the axis on one side of the convex surface of the conical centrifugal fan disc 5, and the plurality of centrifugal blades 6 are distributed in the central area of ​​the conical centrifugal fan disc 5, so that the edge area of ​​the conical centrifugal fan disc 5 forms a conical annular air guide portion 5a without connected blades, and in this case, the outer circle diameter of the conical annular air guide portion 5a is twice the inner circle diameter. The central integrated coaxial connection of the conical centrifugal fan disc 5 is connected with a central head 3, and a plurality of centrifugal blades 6 are distributed around the central head 3, and the plurality of centrifugal blades 6 are vertically connected to the conical centrifugal fan disc 5. The conical centrifugal fan disc 5 is coaxially provided with a wind shell 1 outside the conical centrifugal fan disc 5, and the wind shell 1 includes an air intake cylinder section 1c, a conical ring air guide section 1b and a cylindrical air outlet section 1a which are connected in an integrated coaxial manner. A silencer disk 2 is coaxially arranged within the enclosed range of the cylindrical air outlet section 1a, a conical ring-shaped centrifugal wind bin 24 is formed between the convex surface of the conical centrifugal wind disk 5 and the conical ring air guide section 1b, an annular silencer chamber 26 is formed between the silencer disk 2 and the concave side of the conical centrifugal wind disk 5; an annular air outlet gap 25 is formed between the outer ring of the silencer disk 2 and the inner wall of the cylindrical air outlet section 1a.

[0029] The silencer disk 2 is fixedly connected to the wind housing 1 or other fixed components through a bracket. A drive motor 3 is fixedly installed on one side of the axis of the silencer disk 2 close to the conical centrifugal wind disk 5. The output shaft 4 of the drive motor 3 is fixedly connected to the central head 3 coaxially. The drive motor 3 is in the center of the annular silencer chamber 26.

[0030] like Figure 1 , 5 , 6, 7, each centrifugal blade 6 is a hollow body with a cavity inside. Fig. 9 The end of each centrifugal blade 6 away from the conical centrifugal fan disk 5 is provided with a strip-shaped hollow opening 6a along the contour, and the end of each centrifugal blade 6 close to the axis of the conical centrifugal fan disk 5 is provided with a strip-shaped hollow opening 6b whose length direction is consistent with the axis direction of the conical centrifugal fan disk 5; the internal cavity of the centrifugal blade 6 is through-through along the axis direction of the conical centrifugal fan disk 5, and a fan blade extension piece 8 is provided in parallel and movably constrained in the internal cavity of each centrifugal blade 6, and the end of each fan blade extension piece 8 away from the conical centrifugal fan disk 5 passes through the strip-shaped hollow opening 6a to the outside of the centrifugal blade 6; the axis of the central head 3 is provided with a hollow The bottom of the hollow channel 9 is coaxially fixedly installed with an adjusting motor 11, and the output end of the adjusting motor 11 is drivingly connected to a threaded transmission rod 20 coaxial with the conical centrifugal fan disk 5, and the external thread of the threaded transmission rod 20 is matched with an internal threaded ring body 10, and one end of each fan blade extension piece 8 close to the axis of the conical centrifugal fan disk 5 is fixedly connected to the internal threaded ring body 10 through a connecting arm 7. The internal threaded ring body 10 cannot rotate along its own axis relative to the conical centrifugal fan disk 5 under the matching relationship between the centrifugal blade 6 and the fan blade extension piece 8; each connecting arm 7 passes through the corresponding b-strip hollow opening 6b.

[0031] The outer edge of the columnar central head 3 is provided with a chamfer 50; Fig. 9 A triangular notch 12a is provided at one end of the fan blade extension piece 8 close to the conical centrifugal fan disk 5 and close to the axis of the conical centrifugal fan disk 5; when the fan blade extension piece 8 is inside the centrifugal blade 6, an oblique air distribution channel 12 is formed at the triangular notch 12a inside the centrifugal blade 6; one end of the oblique air distribution channel 12 is connected to the annular muffler chamber 26, and the other end is connected to the central area of ​​the conical annular centrifugal wind bin 24 through an air inlet 43 formed at one end of the b-shaped hollow opening 6b close to the chamfer 50.

[0032] The principle of noise suppression;

[0033] The noise sources are divided into the noise of high-speed rotation of the centrifugal blades 6 and the whistling sound of the high-speed vortex formed in the wind shell 1;

[0034] During the high-speed rotation of the conical centrifugal fan disc 5 and the high-speed rotation of the centrifugal blades 6, a noise source is formed in the center of the conical annular centrifugal wind bin 24. Most of the noise of the high-speed rotation of the blades in the center of the conical annular centrifugal wind bin 24 is reflected by the inner wall of the conical ring air guide section 1b to the annular muffler chamber 26 for repeated reflection and attenuation, thereby reducing the intensity of the noise that is finally transmitted through the annular air outlet gap 25;

[0035] At the same time, the fan structure before and after improvement was simulated under the same conditions by using fluid mechanics finite element analysis software, such as Figure 2 Simulate the simplified model separately:

[0036] like Figure 3 It is a finite element analysis cloud map of fluid mechanics before the fan structure is improved in this case. Under this structure, the edge of the conical centrifugal fan disk 5 does not have the conical ring-shaped air guide portion 5a of this case. From the cloud map, it can be seen that there are at least two large vortex areas in the wind shell 1. The greater the vortex intensity and range, the greater the vortex whistling sound formed.

[0037] like Figure 4 It is a finite element analysis cloud diagram of fluid mechanics after the fan structure is improved in this case. In this structure, the edge area of ​​the conical centrifugal fan disk 5 forms a conical ring-shaped air guide portion 5a structure without connected blades. From the cloud diagram, it can be seen that the improved vortex is reduced in both intensity and range, thereby achieving the purpose of reducing the howling noise.

[0038] Coordination principle of heat dissipation, motor load and wind strength:

[0039] During the high-speed rotation of the conical centrifugal fan disk 5, the heat generated by the driving motor 3 during operation is transferred to the annular muffler chamber 26 under the action of heat conduction. When there is no oblique air distribution channel 12 structure in this case, the hot air from the motor in the annular muffler chamber 26 will only form a circular flow that circulates in situ along the axis under the high-speed rotation of the conical centrifugal fan disk 5 and is difficult to diffuse, thereby affecting the heat dissipation efficiency of the driving motor 3; in this case, since there is an oblique air distribution channel 12 on each blade, the fresh air in the center of the conical annular centrifugal wind bin 24 is continuously replenished into the annular muffler chamber 26 through the oblique air distribution channel 12. Since the annular muffler chamber 26 is continuously replenished with fresh air, the air in the annular muffler chamber 26 is promoted to diffuse to the periphery, thereby increasing the diffusion rate of the hot air in the annular muffler chamber 26;

[0040] Taking into account various factors such as noise, safety and energy consumption, the speed of many drive motors 3 has a maximum speed limit mechanism. When the drive motor 3 cannot further increase the speed at a high speed, if it is necessary to increase the air flow and intensity of the centrifugal fan, the control motor 11 is controlled to rotate the threaded transmission rod 20. Since the internal threaded ring body 10 cannot rotate along its own axis relative to the conical centrifugal fan disk 5 under the matching relationship between the centrifugal blades 6 and the fan blade extension pieces 8; therefore, the rotation of the threaded transmission rod 20 tends to cause the internal threaded ring body 10 to move away from the adjusting motor 11 along the axial direction under the drive of the thread matching, so that each fan blade extension piece 8 gradually extends outward from the a-shaped hollow opening 6a under the linkage of the connecting arm 7, Figure 7 becomes Figure 8 , thereby increasing the exposed area of ​​each fan blade extension piece 8, playing a role in extending the windward area of ​​each centrifugal blade 6, and further achieving the purpose of obtaining a stronger exhaust flow and intensity at the same speed;

[0041] After the windward area of ​​each centrifugal blade 6 is extended, the load of the drive motor 3 will also increase accordingly, thereby increasing the heat generated by the drive motor 3. At this time, as each fan blade extension piece 8 gradually extends outward from the a-shaped hollow opening 6a, the width of the oblique air distribution channel 12 is automatically widened accordingly, thereby increasing the gas flow rate of the oblique air distribution channel 12, thereby increasing the rate of replenishing fresh and relatively cold air into the annular silencer chamber 26, and increasing the diffusion rate of heat in the annular silencer chamber 26, thereby achieving hedging and alleviating the problem of increased heat generation of the drive motor 3 due to the increased load.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A centrifugal fan structure with low noise and high efficiency motor heat dissipation, Features: Comprising a conical centrifugal fan disk (5), wherein a plurality of centrifugal blades (6) are distributed in a circular array along the axis on one side of a convex surface of the conical centrifugal fan disk (5), and the plurality of centrifugal blades (6) are distributed in a central area of ​​the conical centrifugal fan disk (5), so that an edge area of ​​the conical centrifugal fan disk (5) forms a conical ring-shaped air guide portion (5a) without connected blades; The conical centrifugal fan disk (5) is coaxially connected to a central head (3) in an integrated manner at the center, and a plurality of centrifugal blades (6) are distributed around the central head (3), and the plurality of centrifugal blades (6) are vertically and integrally connected to the conical centrifugal fan disk (5); Each of the centrifugal blades (6) is a hollow body with a cavity inside, and an end of each of the centrifugal blades (6) away from the conical centrifugal fan disk (5) is provided with a strip-shaped hollow opening (6a) along the contour, and an end of each of the centrifugal blades (6) close to the axis of the conical centrifugal fan disk (5) is provided with a strip-shaped hollow opening (6b) whose length direction is consistent with the axis direction of the conical centrifugal fan disk (5); The inner cavity of the centrifugal blade (6) is connected front to back along the axis direction of the conical centrifugal fan disk (5); a fan blade extension piece (8) is arranged in parallel and movably constrained in the inner cavity of each centrifugal blade (6); one end of each fan blade extension piece (8) away from the conical centrifugal fan disk (5) passes through the strip-shaped hollow opening (6a) to the outside of the centrifugal blade (6); a hollow channel (9) is arranged at the axis of the central head (3); an adjusting motor (11) is fixedly installed at the bottom of the hollow channel (9) coaxially with the axis; the output end of the adjusting motor (11) drives the connecting rod (11) to the outer surface of the centrifugal blade (6); A threaded transmission rod (20) coaxial with the conical centrifugal fan disk (5) is connected, the external thread of the threaded transmission rod (20) is matched with an internal threaded ring body (10), one end of each fan blade extension piece (8) close to the axis of the conical centrifugal fan disk (5) is fixedly connected to the internal threaded ring body (10) through a connecting arm (7), and the internal threaded ring body (10) cannot rotate along its own axis relative to the conical centrifugal fan disk (5) under the matching relationship between the centrifugal blade (6) and the fan blade extension piece (8); each connecting arm (7) passes through the corresponding b-shaped hollow opening (6b); The outer edge of the columnar central head (3) is provided with a chamfer (50); the end of the fan blade extension piece (8) close to the conical centrifugal fan disk (5) and close to the axis of the conical centrifugal fan disk (5) is provided with a triangular notch (12a); When the fan blade extension piece (8) is inside the centrifugal blade (6), an oblique air distribution channel (12) is formed at the triangular notch (12a) inside the centrifugal blade (6); One end of the oblique air distribution channel (12) is connected to the annular muffler chamber (26), and the other end is connected to the central area of ​​the conical annular centrifugal wind bin (24) through an air inlet (43) formed at one end of the b-shaped hollow opening (6b) close to the chamfer (50).

2. A centrifugal fan structure with low noise and high efficiency motor heat dissipation according to claim 1, Features: A wind shell (1) is coaxially arranged outside the conical centrifugal wind disk (5), and the wind shell (1) comprises an air intake cylinder section (1c), a conical ring air guide section (1b) and a cylindrical air outlet section (1a) which are coaxially connected in an integrated manner.

3. A centrifugal fan structure with low noise and high efficiency in motor heat dissipation according to claim 2, Features: A silencer disk (2) is coaxially arranged within the enclosed range of the cylindrical air outlet section (1a); a conical annular centrifugal air bin (24) is formed between the convex surface of the conical centrifugal air disk (5) and the conical annular air guide section (1b); an annular silencer chamber (26) is formed between the silencer disk (2) and the concave side of the conical centrifugal air disk (5); and an annular air outlet gap (25) is formed between the outer ring of the silencer disk (2) and the inner wall of the cylindrical air outlet section (1a).

4. A centrifugal fan structure with low noise and high efficiency in motor heat dissipation according to claim 3, Features: The silencer disk (2) is fixedly connected to the wind housing (1) or other fixed components via a bracket, a drive motor (3) is fixedly mounted on a side of the axis of the silencer disk (2) close to the conical centrifugal wind disk (5), and an output shaft (4) of the drive motor (3) is fixedly connected to the central head (3) coaxially.

5. A centrifugal fan structure with low noise and high efficiency in motor heat dissipation according to claim 1, Features: As each fan blade extension piece (8) gradually extends outward from the strip-shaped hollow opening (6a), the width of the oblique air distribution channel (12) also automatically widens accordingly.

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