CN217206960U

CN217206960U - Centrifugal fan structure

Info

Publication number: CN217206960U
Application number: CN202220599355.7U
Authority: CN
Inventors: 李靖; 李晏; 肖前明; 林祉佯; 李�浩; 郭林伟; 吴强
Original assignee: Chengdu Qihang System Integration Co ltd
Current assignee: Chengdu Qihang System Integration Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-08-16
Anticipated expiration: 2032-03-18

Abstract

The utility model discloses a centrifugal fan structure, which comprises a bottom plate, a cover plate and an impeller arranged between the cover plate and the bottom plate, wherein a side wall plate is arranged between the edge of the bottom plate and the cover plate, one side of the side wall plate is provided with an air supply outlet, and the cover plate is provided with an air inlet; the impeller includes a hub; the top surface of the hub is provided with an annular step, and the step is provided with a plurality of blades which are uniformly distributed along the circumferential direction around the step; the blade comprises a connecting section and an extending section which are both arc-shaped; the extension section middle part is equipped with vertical portion downwards, vertical portion bottom is connected with the horizontal part, the horizontal part along the extension section direction extends to the free end department of extension section, form between vertical portion and the horizontal part and let the position mouth. The utility model provides a centrifugal fan structure increases the effective working area of blade, improves centrifugal fan's efficiency and lift, can avoid blade and apron to take place to interfere simultaneously, practices thrift the complete machine space when guaranteeing air intake dimensional requirement.

Description

Centrifugal fan structure

Technical Field

The utility model relates to a centrifugal fan technical field especially relates to a centrifugal fan structure.

Background

The centrifugal fan generally provides power for air circulation of components connected with the centrifugal fan, and the centrifugal fan increases gas pressure and discharges gas by means of input mechanical energy, so that the pneumatic efficiency of the centrifugal fan is the key for saving energy consumption. When the centrifugal fan normally operates, the impeller is driven by the motor to rotate in the volute, and air enters from the center of the impeller through the air inlet chamber. The centrifugal force of the rotation of the blades enables the gas to obtain energy, the pressure and the speed of the gas are rapidly improved, and the gas is thrown to the shell along the blade channel under the action of the centrifugal force and is discharged from the gas outlet of the volute. Along with the increase of the heat dissipation capacity of the electronic element, the centrifugal fan is required to generate larger air pressure and air quantity when working, and the structure of the impeller has larger influence on the generated air pressure and air quantity. In the prior art, the working area of the blades of the impeller is limited due to the size limitation of the whole centrifugal fan, the air quantity of the centrifugal fan cannot be greatly increased, and the efficiency of the centrifugal fan is low, so that the structural design of the impeller is an important research point for improving the efficiency of the centrifugal fan.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages which will be described later.

In order to solve the defects of the prior art, the utility model provides a centrifugal fan structure, which comprises a bottom plate, a cover plate and an impeller arranged between the cover plate and the bottom plate, wherein a side wall plate surrounding the impeller from the radial outer side is arranged between the edge of the bottom plate and the cover plate, one side of the side wall plate is provided with an air supply outlet, and the cover plate is provided with an air inlet coaxial with the impeller;

the impeller comprises a hub, the center of the bottom surface of the hub is arched upwards to form an accommodating cavity for mounting a motor, and the motor drives the impeller to rotate;

the top surface of the hub is provided with an annular step, and the step is provided with a plurality of blades which are uniformly distributed around the step along the circumferential direction; the blade comprises a connecting section and an extending section which are both arc-shaped; one end of the connecting section is connected with the step, the other end of the connecting section is connected with the extending section, and the free end of the extending section extends to the edge of the hub; a vertical part is downwards arranged in the middle of the extending section, the bottom end of the vertical part is connected with a horizontal part, the horizontal part extends to the free end of the extending section along the direction of the extending section, a yielding opening for yielding the cover plate is formed between the vertical part and the horizontal part, and the connecting section and part of the extending section extend into the air inlet but do not exceed the top surface of the air inlet; the projection of any vertical part on the hub is a tangent line of a circle with the center of the hub as the center of the circle.

Further, the number of the blades is 33, and the thickness of the blades is 0.47 mm.

Furthermore, the two side surfaces of the blade are an inner arc surface and an outer arc surface, the center of a circle where the inner arc surface is located coincides with the center of a circle where the outer arc surface is located, the radius r3 of the circle where the outer arc surface is located is 3.8mm, and the radius r4 of the circle where the inner arc surface is located is 3.33 mm; the included angle a between the tangent line of the circle of the extrados at the free end of the extension section and the tangent line of the circle of the hub at the free end is 28.2 degrees.

Further, the end of the connecting section of the blade, which is far away from the extending section, is an arc-shaped surface A, the end of the free end of the extending section is an arc-shaped surface B, the radius r1 of the circle where the arc-shaped surface A is located is 0.24mm, and the radius r2 of the circle where the arc-shaped surface B is located is 0.24 mm.

Further, the diameter of a circle where the connecting section of the blade is far away from the end of the extending section is L1, the diameter of a circle where the projection of the vertical part on the hub is located is L2, the diameter of a circle where the hub is located is L3, L1: l2: l3 was 26:33: 35.75.

Further, the vertical portion height is 1.5 mm.

Further, the air inlet is provided with a dust cover.

Further, the motor comprises a stator and a rotor, the rotor comprises a magnetic ring component arranged on the wall of the accommodating cavity, the stator comprises a middle pipe, the bottom of the middle pipe is vertically arranged on the bottom plate, the top of the middle pipe upwards extends into the accommodating cavity, a coil component and a circuit board are sleeved outside the middle pipe from top to bottom, and the coil component is positioned between the magnetic ring component and the middle pipe; a rotatable shaft core is installed in the middle tube through an upper bearing and a lower bearing, and the top end of the shaft core extends upwards out of the middle tube and is fixed to the center of the bottom of the hub accommodating cavity.

Furthermore, the bottom plate surface of the periphery of the bottom of the middle pipe is provided with an annular convex shoulder, and the bottom surface of the circuit board is positioned on the convex shoulder.

Furthermore, a plurality of limiting protruding heads are installed at the bottom of the accommodating cavity, and the top of the magnetic ring part is located below the limiting protruding heads.

The utility model discloses at least, include following beneficial effect: the bottom plate, the cover plate and the side wall plate of the centrifugal fan structure enclose a space for accommodating the impeller, the connecting section and the partial extending section of the blade extend into the air inlet but do not exceed the top surface of the air inlet, the height of the blade can be effectively increased, so that the effective working area of the blade is increased, the air supply efficiency and the operation performance of the whole centrifugal fan are effectively improved, meanwhile, the arrangement of the position port avoids the interference between the blade and the cover plate around the air inlet, the size requirement of the air inlet is ensured, the whole machine space of the centrifugal fan is saved to the maximum extent, and the miniaturization design of the centrifugal fan is facilitated; the arrangement of the steps is beneficial to enhancing the strength of the hub, so that the structural strength of the impeller is improved, and the deformation change of the impeller structure after the centrifugal fan is used for a long time is avoided; the center of the bottom surface of the hub is arched upwards to form a containing cavity for installing the motor, and the space for installing the motor is saved in the axial direction by the containing cavity, so that the space of the whole centrifugal fan is saved.

The utility model discloses during the use, thereby realized through the effective work area who increases the blade of increase blade height, guarantee when improving the air supply efficiency of complete machine effectively that centrifugal fan complete machine space does not increase, practice thrift the purpose in complete machine space.

Drawings

Fig. 1 is a schematic structural view of the centrifugal fan of the present invention.

Fig. 2 is a schematic view of the explosion structure of the centrifugal fan of the present invention.

Fig. 3 is a schematic structural view of the impeller of the present invention.

Fig. 4 is a schematic structural view of the bottom surface of the impeller of the present invention.

Fig. 5 is a schematic top view of the impeller of the present invention.

Fig. 6 is an enlarged schematic structural diagram of a in fig. 5 according to the present invention.

Fig. 7 is a schematic view of the bottom plate structure of the present invention.

Reference numerals are as follows: 1-bottom plate, 2-cover plate, 21-air inlet, 22-dust cover, 3-impeller, 31-hub, 311-containing cavity, 32-step, 4-side wall plate, 41-air outlet, 6-blade, 61-connecting section, 62-extending section, 621-free end, 622-vertical section, 623-horizontal section, 624-relief opening, 63-inner arc surface, 64-outer arc surface, 65-arc surface A, 66-arc surface B, 7-stator, 71-middle tube, 8-rotor, 81-magnetic ring component, 9-coil component, 10-shaft core, 11-convex shoulder, 12-limiting convex head and 13-circuit board.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Fig. 1 to 7 show a centrifugal fan structure of the present invention, which includes a bottom plate 1, a cover plate 2 and an impeller 3 installed between the cover plate 2 and the bottom plate 1, a side wall plate 4 surrounding the impeller 3 from the radial outside is provided between the edge of the bottom plate 1 and the cover plate 2, an air supply opening 41 is provided on one side of the side wall plate 4, and an air inlet 21 coaxial with the impeller 3 is provided on the cover plate 2;

the impeller 3 comprises a hub 31, the center of the bottom surface of the hub 31 is arched upwards to form a containing cavity 311 for installing a motor, and the motor drives the impeller 3 to rotate;

the top surface of the hub 31 is provided with an annular step 32, and the step 32 is provided with a plurality of blades 6 which are uniformly distributed around the step 32 along the circumferential direction; the blade 6 comprises a connecting section 61 and an extending section 62 which are both arc-shaped; one end of the connecting section 61 is connected with the step 32, and the other end thereof is connected with the extending section 62, and the free end 621 of the extending section 62 extends to the edge of the hub 31; a vertical part 622 is arranged downwards in the middle of the extending section 62, the bottom end of the vertical part 622 is connected with a horizontal part 623, the horizontal part 623 extends to the free end 621 of the extending section 62 along the direction of the extending section 62, a relief opening 624 for relieving the cover plate 2 is formed between the vertical part 622 and the horizontal part 623, and the connecting section 61 and part of the extending section 62 extend into the air inlet 21 but do not exceed the top surface of the air inlet 21; the projection of any of the vertical portions 622 on the wheel hub 31 is a tangent line of a circle with the center of the wheel hub 31 as the center.

Specifically, the bottom plate 1 and the side wall plate 4 can be integrally formed or welded together, and the cover plate 2 is fixed on the side wall plate 4 through bolts, so that the disassembly and the assembly are convenient for internal maintenance; the hub 31, the step 32 and the blade 6 are integrally formed by injection molding of a die, so that the overall strength of the impeller 3 is enhanced; the bottom plate 1, the cover plate 2 and the side wall plate 4 enclose a space for accommodating the impeller 3, the connecting section 61 and the partial extending section 62 of the blade 6 extend into the air inlet 21 but do not exceed the top surface of the air inlet 21, the height of the blade 6 can be effectively increased, so that the effective working area of the blade 6 is increased, the air supply efficiency and the operation performance of the whole centrifugal fan are effectively improved, meanwhile, the position opening 624 is arranged to avoid the interference between the blade 6 and the cover plate 2 around the air inlet 21, the size requirement of the air inlet 21 is ensured, the whole space of the centrifugal fan is saved to the maximum extent, and the miniaturization design of the centrifugal fan is facilitated; the step 32 is beneficial to enhancing the strength of the hub 31, so that the structural strength of the impeller 3 is improved, and the structural deformation change of the impeller 3 after the centrifugal fan is used for a long time is avoided; the center of the bottom surface of the hub 31 is arched upwards to form an accommodating cavity 311 for installing the motor 5, and the arrangement of the accommodating cavity 311 saves the space for installing the motor 5 in the axial direction, so that the whole space of the centrifugal fan is saved.

The number of the blades 6 is 33, the 33 blades 6 are uniformly distributed on the hub 31, in order to meet the requirements of fan performance and blade structural strength and facilitate manufacturing, the thickness d of the blade 6 is preferably 0.47mm, the performance of the blade 6 is reduced when the thickness d exceeds 0.47mm, the strength of the blade is reduced when the thickness d is less than 0.47mm, and the blade is difficult to manufacture. The two side surfaces of the blade 6 are an inner arc surface 63 and an outer arc surface 64, the center of a circle where the inner arc surface 63 is located is coincident with the center of a circle where the outer arc surface 64 is located, the radius r3 of the circle where the outer arc surface 64 is located is 3.8mm, and the radius r4 of the circle where the inner arc surface 63 is located is 3.33 mm; the included angle a between the tangent line of the circle of the extrados surface 64 at the free end 621 of the extension section 62 and the tangent line of the circle of the hub 31 at the free end 621 is 28.2 °; the diameter of the circle on which the connecting section 61 of the blade 6 is far away from the end of the extending section 62 is L1, the diameter of the circle on which the projection of the vertical part 622 on the hub 31 is located is L2, the diameter of the circle on which the hub 31 is located is L3, L1: l2: l3 is 26:33: 35.75;

the end of the connecting section 61 of the vane 6, which is far away from the extending section 62, is an arc-shaped surface a65, the end of the free end 621 of the extending section 62 is an arc-shaped surface B66, the end of the connecting section 61 is set to be an arc-shaped surface a65, and the end of the free end 621 is set to be an arc-shaped surface B66, so that the noise generated when the vane 6 of the impeller 3 rotates can be reduced, and the manufacturing is facilitated; the radius r1 of a circle on which the arc-shaped face A65 is located is 0.24mm, and the radius r2 of a circle on which the arc-shaped face B66 is located is 0.24 mm.

In order to effectively avoid the interference between the blade 6 and the cover plate 2, the height of the vertical part is 1.5mm, and the bottom surface of the cover plate 2 is ensured to be staggered with the extension section 62 of the blade 6.

Impeller 3 at fan air intake 21 position is in exposed state, and the fan during operation, impeller 3 high-speed rotation, and the foreign matter is easily followed air intake 21 and is inhaled the fan, leads to fan damage or other losses, and in order to avoid the fan to be damaged by the foreign matter of following air intake 21 inhalation, dust cover 22 is installed to air intake 21 department, and dust cover 22 has avoided fan during operation impeller and human diameter to contact, improves the security, can effectively block the foreign matter simultaneously and be inhaled the fan, reduces the risk.

The motor comprises a stator 7 and a rotor 8, the rotor 8 comprises a magnetic ring component 81 arranged on the cavity wall of the accommodating cavity 311, the stator 7 comprises a middle pipe 71, the bottom of the middle pipe 71 is vertically arranged on the bottom plate 1, the top of the middle pipe 71 extends upwards into the accommodating cavity 311, a coil component 9 and a circuit board 10 are sleeved outside the middle pipe 71 from top to bottom, the coil component 9 is positioned between the magnetic ring component 81 and the middle pipe 71, the bottom of the coil component 9 is connected with the circuit board 13, and the circuit board 13 is connected with an external power supply through a lead; a rotatable shaft core 10 is mounted in the middle pipe 71 through an upper bearing and a lower bearing (not shown), and the top end of the shaft core 10 extends upwards out of the middle pipe 71 and is fixed at the center of the bottom of the accommodating cavity 311 of the wheel hub 31.

The surface of the bottom plate 1 at the periphery of the bottom of the middle pipe 71 is provided with an annular convex shoulder 11, the bottom surface of the circuit board 13 is positioned on the convex shoulder 11, the circuit board 13 abuts against the upper surface of the convex shoulder 11, the convex shoulder 11 supports the circuit board 13, the circuit board 13 is prevented from moving downwards from the middle pipe 71, and therefore the coil component 9 is further fixed.

The bottom of the accommodating cavity 311 is provided with a plurality of limiting raised heads 12, the top of the magnetic ring part 81 is positioned below the limiting raised heads 12, the limiting raised heads 12 are arranged to enable a gap to exist between the top of the magnetic ring part 81 and the bottom of the accommodating cavity 311, a space is reserved for dynamic balance correction of the impeller 3, and meanwhile the limiting raised heads 12 can play a limiting role when the magnetic ring part 81 is installed. The impeller 3 is in dynamic balance by adopting a mass adding mode, balance soil is required to be added on the impeller 3 and only can be added in the impeller 3, and the arrangement of the limiting raised heads 12 enables the balance soil to be added at the position between the limiting raised heads 12 at the bottom of the accommodating cavity 311, so that a space is reserved for dynamic balance correction of the impeller 3.

The utility model discloses during the specific use, through current wave alternating frequency and wave form on changing input coil part 9, form around coil part 9 around the rotatory electromagnetic field in 3 geometric axes of impeller, electromagnetic field drive magnetic ring part 81 rotates, and magnetic ring part 81 drives impeller 3 and blade 6 and rotates to make the air current follow air intake 21 and discharge from air outlet 41 after getting into.

While the embodiments of the invention have been described above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications can be easily made by those skilled in the art without departing from the general concept defined by the claims and their equivalents, and it is therefore not limited to the specific details and illustrations shown and described herein, and it is obvious that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A centrifugal fan structure is characterized by comprising a bottom plate (1), a cover plate (2) and an impeller (3) arranged between the cover plate (2) and the bottom plate (1), wherein a side wall plate (4) surrounding the impeller (3) from the radial outer side is arranged between the edge of the bottom plate (1) and the cover plate (2), an air supply opening (41) is formed in one side of the side wall plate (4), and an air inlet (21) coaxial with the impeller (3) is formed in the cover plate (2);

the impeller (3) comprises a hub (31), the center of the bottom surface of the hub (31) is arched upwards to form a containing cavity (311) for installing a motor, and the motor drives the impeller (3) to rotate;

the top surface of the hub (31) is provided with an annular step (32), and the step (32) is provided with a plurality of blades (6) which are uniformly distributed around the step (32) along the circumferential direction; the blade (6) comprises a connecting section (61) and an extending section (62) which are both arc-shaped; one end of the connecting section (61) is connected with the step (32), the other end of the connecting section is connected with the extension section (62), and the free end (621) of the extension section (62) extends to the edge of the hub (31); a vertical part (622) is downwards arranged in the middle of the extending section (62), the bottom end of the vertical part (622) is connected with a horizontal part (623), the horizontal part (623) extends to the free end (621) of the extending section (62) along the direction of the extending section (62), a yielding opening (624) used for yielding the cover plate (2) is formed between the vertical part (622) and the horizontal part (623), and the connecting section (61) and a part of the extending section (62) stretch into the air inlet (21) but do not exceed the top surface of the air inlet (21); the projection of any vertical part (622) on the wheel hub (31) is a tangent line of a circle which takes the center of the wheel hub (31) as the center.

2. A centrifugal fan structure according to claim 1, characterized in that the number of blades (6) is 33, the thickness of the blades (6) being 0.47 mm.

3. The centrifugal fan structure according to claim 2, wherein the two side surfaces of the blade (6) are an inner arc surface (63) and an outer arc surface (64), the center of a circle with the inner arc surface (63) is coincident with the center of a circle with the outer arc surface (64), the radius r3 of the circle with the outer arc surface (64) is 3.8mm, and the radius r4 of the circle with the inner arc surface (63) is 3.33 mm; the included angle a between the tangent line of the circle of the outer arc surface (64) at the free end (621) of the extension section (62) and the tangent line of the circle of the hub (31) at the free end (621) is 28.2 degrees.

4. A centrifugal fan structure according to claim 2, characterized in that the end of the connecting section (61) of the blade (6) remote from the extension section (62) is an arc-shaped surface a (65), the free end (621) of the extension section (62) is an arc-shaped surface B (66), the radius r1 of the circle on which the arc-shaped surface a (65) is located is 0.24mm, and the radius r2 of the circle on which the arc-shaped surface B (66) is located is 0.24 mm.

5. A centrifugal fan structure according to claim 2, characterized in that the diameter of the circle on which the connecting section (61) of the blade (6) ends away from the extension (62) lies is L1, the diameter of the circle on which the projection of the upright (622) onto the hub (31) lies is L2, the diameter of the circle on which the hub (31) lies is L3, L1: l2: l3 was 26:33: 35.75.

6. A centrifugal fan structure according to claim 1, characterized in that the vertical portion (622) is 1.5mm high.

7. A centrifugal fan structure according to claim 1, characterized in that a dust cover (22) is mounted at the air inlet (21).

8. The centrifugal fan structure as claimed in claim 1, wherein the motor comprises a stator (7) and a rotor (8), the rotor (8) comprises a magnetic ring component (81) mounted on the wall of the accommodating cavity (311), the stator (7) comprises a middle pipe (71), the bottom of the middle pipe (71) is vertically mounted on the bottom plate (1), the top of the middle pipe extends upwards into the accommodating cavity (311), a coil component (9) and a circuit board (13) are sleeved outside the middle pipe (71) from top to bottom, and the coil component (9) is located between the magnetic ring component (81) and the middle pipe (71); a rotatable shaft core (10) is mounted in the middle pipe (71) through an upper bearing and a lower bearing, and the top end of the shaft core (10) extends upwards out of the middle pipe (71) and is fixed at the center of the bottom of the accommodating cavity (311) of the wheel hub (31).

9. The centrifugal fan structure according to claim 8, wherein the bottom peripheral bottom surface of the middle pipe (71) is provided with a circular shoulder (11) on the surface of the bottom plate (1), and the bottom surface of the circuit board (13) is positioned on the shoulder (11).

10. The centrifugal fan structure as claimed in claim 8, wherein a plurality of limiting protrusions (12) are mounted at the bottom of the accommodating cavity (311), and the top of the magnetic ring part (81) is located below the limiting protrusions (12).