CN110500305B

CN110500305B - Motor support and centrifugal fan

Info

Publication number: CN110500305B
Application number: CN201910829889.7A
Authority: CN
Inventors: 霍星凯; 蒋济武
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2022-02-22
Anticipated expiration: 2039-08-30
Also published as: CN110500305A

Abstract

The invention discloses a motor support and a centrifugal fan, wherein the motor support comprises a main body part and a concave part, the main body part is provided with a abdicating hole, and the abdicating hole is used for a motor to penetrate through; the depressed part by the main part is followed the sunken formation of axis direction in hole of stepping down, the tank bottom of depressed part is equipped with a plurality of mounting holes, and is a plurality of the mounting hole is followed the circumference interval in hole of stepping down is arranged, the mounting hole is used for supplying the motor is fixed. The technical scheme of the invention can increase the strength of the motor bracket.

Description

Motor support and centrifugal fan

Technical Field

The invention relates to the field of fans, in particular to a motor support and a centrifugal fan.

Background

The trompil mode of motor fixed orifices in traditional motor support directly trompil on motor support's the principal plane, makes the motor fastening through the screw. The hole opening mode has higher requirements on the material strength and the thickness of the volute casing back plate. In practical application, when the motor is fastened by the screws, the volute back plate is easy to stretch and deform, so that the flatness of the motor support is deteriorated, the concentricity of the impeller, the volute front plate, the air inlet ring and the motor support is influenced, the axial and radial gaps between the impeller and the air inlet ring are changed, and the performance of the fan is unfavorable.

Disclosure of Invention

The invention mainly aims to provide a motor bracket, aiming at increasing the strength of the motor bracket.

In order to achieve the purpose, the invention provides a motor bracket which comprises

The main body part is provided with a yielding hole, and the yielding hole is used for a motor to penetrate through; and

the depressed part, the depressed part by the main part is followed the sunken formation of axis direction in hole of stepping down, the tank bottom of depressed part is equipped with a plurality of mounting holes, and is a plurality of the mounting hole is followed the circumference interval in hole of stepping down is arranged, the mounting hole is used for supplying the motor is fixed.

Optionally, the main body portion is provided with the recessed portion, and the recessed portion is annular.

Optionally, the recess extends to a wall of the relief hole.

Optionally, the connecting wall between the recess and the main body is inclined so that the opening of the recess is gradually enlarged.

Optionally, an included angle between the connecting wall and an axis of the mounting hole is greater than or equal to 10 ° and less than or equal to 70 °.

Optionally, the depression depth of the depression is greater than or equal to 1mm, and less than or equal to 5 mm.

Optionally, the hole edge of the mounting hole is folded towards the concave direction of the concave part to form a turn of flanging.

The invention also provides a centrifugal fan, which is characterized by comprising:

a volute including a volute back plate;

an impeller disposed within the volute;

the motor support is fixedly arranged on the volute back plate and comprises a main body part and a sunken part, and the main body part is provided with a abdicating hole; the sunken part is formed by integrally sunken main body parts along the axial direction of the abdicating hole, a plurality of mounting holes are arranged at the bottom of the sunken part, and the mounting holes are arranged at intervals along the circumferential direction of the abdicating hole; and the number of the first and second groups,

the motor, the motor stretches into the hole of stepping down, the outer peripheral face of motor is equipped with fixed protruding edge, fixed protruding edge is last and correspond each the mounting hole all is equipped with the fixed orifices, fixed protruding edge with the main part butt.

Optionally, the motor bracket is integrally formed with the volute back plate.

Optionally, a shock absorbing pad is disposed between the fixing ledge and the main body portion.

According to the fan, the motor support is integrally sunken to form the sunken part, and the mounting hole which is fixed with the motor and is formed in the sunken part, so that the local strength of the motor support can be increased on the premise of not changing the material strength and the material thickness of the motor support, and the motor support is not easy to stretch and deform when the motor is fastened, so that the concentricity of the impeller, the volute and the air inlet ring is ensured, the key parameter of fan design is ensured, and the stability of a fan system is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is an exploded view of a centrifugal fan according to the present invention;

FIG. 2 is a cross-sectional view of the centrifugal fan of FIG. 1;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is a schematic view of the volute back plate of FIG. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Impeller	34	Front air inlet
11	Front plate	35	Rear air inlet
				12	Blade	40	Motor support
13	Back plate	41	Main body part
				20	Electric machine	42	Concave part
21	Fixed convex edge	43	Connecting wall
				22	Fixing hole	44	Hole of stepping down
30	Spiral casing	45	Mounting hole
				31	Volute front plate	46	Flanging
32	Volute casing coaming	50	Shock pad
				33	Volute back plate	60	Screw nail

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a motor support which is used for fixing a motor.

In the embodiment of the present invention, as shown in fig. 1 to 4, the motor bracket 40 includes:

the main body part 41, the main body part 41 is provided with a yielding hole 44, and the yielding hole 44 is used for the power supply machine 20 to penetrate through; and

depressed part 42, depressed part 42 by main part 41 is followed the integrative sunken formation of axis direction of hole 44 of stepping down, the tank bottom of depressed part 42 is equipped with a plurality of mounting holes 45, and is a plurality of mounting holes 45 are followed the circumference interval of hole 44 of stepping down arranges, mounting holes 45 are used for supplying motor 20 is fixed.

The main body 41 has a substantially plate shape, for example, the main body 41 may have a circular ring shape, and a hollow area thereof constitutes a relief hole 44 through which the power supply unit 20 is inserted. The main body 41 may have a square ring shape, a triangular ring shape, or the like. The recess 42 may be generally annular, circular, square, etc. Since the motor holder 40 is generally made of metal, the recess 42 is integrally formed by pressing the main body 41.

Usually, the outer peripheral face of motor 20 is equipped with fixed protruding edge 21, fixed protruding edge 21 is last and correspond each of motor support 40 mounting hole 45 all is equipped with fixed orifices 22, and motor 20 stretches into in the hole 44 of stepping down, fixed protruding edge 21 with main part 41 butt carries out axial spacing to motor 20. To prevent the motor 20 from shaking, a fastening member (e.g., a screw 60, a bolt, etc.) is typically provided, and the fastening member is inserted through the mounting hole 45 and the fixing hole 22, respectively, to fix the motor 20 to the motor bracket 40. Because the fixed convex edge 21 is abutted with the main body part 41, the fixed convex edge 21 and the groove bottom of the concave part 42 are spaced, the contact area of the fastening piece and the motor bracket 40 is reduced, and the transmission of vibration can be reduced to a certain extent.

Generally, in order to fix the motor 20, holes are directly formed in the motor bracket 40, and the hole forming mode has higher requirements on the material strength and the thickness of the motor bracket 40. In practical applications, when the motor 20 is fastened to the motor bracket 40 by a fastening member such as a screw 60, the motor bracket 40 is easily stretched and deformed, so that the flatness of the motor bracket 40 is deteriorated, the concentricity of the impeller 10, the volute 30, the air inlet ring and the motor bracket 40 of the fan is affected, the axial and radial gaps between the impeller 10 and the air inlet ring are changed, and the performance of the fan is unfavorable. In the embodiment of the invention, the motor support 40 is integrally sunken to form the sunken part 42, and the mounting hole 45 on the motor support 40 and fixed with the motor 20 is arranged in the sunken part 42, so that the local strength of the motor support 40 is increased on the premise of not changing the material strength and the material thickness of the motor support 40, and the motor support 40 is not easy to stretch and deform when the motor 20 is fastened, thereby ensuring the concentricity of the impeller 10, the volute 30 and the air inlet ring, ensuring the key parameters of fan design and improving the stability of a fan system.

In an embodiment of the present invention, the plurality of mounting holes 45 may be commonly formed on the bottom of the same recess 42, for example, in an embodiment, the main body 41 is provided with a recess 42, and the recess 42 is annular and extends along the circumferential direction of the offset hole 44. Alternatively, the recess 42 extends to the wall of the relief hole 44 such that the motor bracket 40 is stepped. By extending the recess 42 to the wall of the relief hole 44, demolding during molding of the recess 42 can be facilitated. In addition, each of the mounting holes 45 may also be correspondingly formed on the bottom of a different recess 42; or a part of the mounting holes 45 are formed on the groove bottom of the same depressed part 42, and the other part of the mounting holes 45 are formed on the groove bottom of the other depressed part 42. For example, in an embodiment, the main body 41 is provided with a plurality of recessed portions 42, the plurality of recessed portions 42 are arranged at intervals along the circumferential direction of the yielding hole 44, and the bottom of each recessed portion 42 is provided with one of the mounting holes 45.

The recess 42 may be circular, square, triangular, or different in shape.

In one embodiment, the connecting wall 43 between the recess 42 and the main body 41 is inclined to make the opening of the recess 42 gradually enlarged, thereby facilitating the demolding. Optionally, an included angle α between the connecting wall 43 and the axis of the mounting hole 45 is greater than or equal to 10 ° and less than or equal to 70 °, and the included angle α between the connecting wall 43 and the axis of the mounting hole 45 may be set to any angle between 10 ° and 70 °, specifically, the included angle α between the connecting wall 43 and the axis of the mounting hole 45 may be set to 10 °, 15 °, 30 °, 40 °, 60 °, or 70 °, and so on. In addition, the included angle α between the connecting wall 43 and the axis of the mounting hole 45 may be set to be greater than or equal to 30 ° and less than or equal to 60 °, which is also effective in facilitating the mold stripping and improving the local strength of the recess 42.

In one embodiment, the depth H of the recess 42 is greater than or equal to 1mm and less than or equal to 5 mm. Optionally, the recess depth H of the recess 42 is greater than or equal to 1mm and less than or equal to 2 mm. Specifically, the recess depth H of the recess 42 can be set to any value between 1mm and 5mm, for example, 1mm, 2mm, 2.5mm, 4mm, 5mm, and the like. If the recess depth H of the recess 42 is set too large, the connecting wall 43 is made thin, and thus the strength is lowered; if the recess depth H of the recess 42 is set too small, the local reinforcing effect is not significant. The recess depth H of the recess 42 is set to 1mm to 5mm in this embodiment to prevent the above phenomenon.

In one embodiment, the edge of the mounting hole 45 is folded toward the recessed direction of the recessed portion 42 to form a ring of flanges 46, so that the screw 60 can be easily contacted with the flanges 46, and the fastening effect is improved.

The invention further provides a centrifugal fan.

In the embodiment of the present invention, as shown in fig. 1 to 4, the centrifugal fan includes an impeller 10, a motor 20, a scroll casing 30, and a motor support 40, the motor 20 is fixed to the scroll casing 30 by the motor support 40, the impeller 10 is disposed in the scroll casing 30, and the impeller 10 is mounted on a driving shaft of the motor 20.

Impeller 10 includes preceding dish 11, back dish 13 and a plurality of blade 12, and preceding dish 11 and back dish 13 interval set up, and a plurality of blades 12 are followed the circumference interval of preceding dish 11 sets up, blade 12 connect respectively preceding dish 11 with back dish 13. I.e. the blades 12 are circumferentially distributed evenly in a plane perpendicular to the front disc 11 and the rear disc 13 and the blades 12 are parallel to each other.

The front disk 11 is substantially circular, one end of the front disk 11 is an air inlet end of the centrifugal fan, and an air inlet ring is usually installed at the front disk 11. The impeller 10 may be a single-layer impeller 10, and for the single-layer impeller 10, the back plate 13 is provided with a relief hole 44 into which the driving shaft of the motor 20 extends and fits. The impeller 10 can also be a double-layer impeller 10, and for the double-layer impeller 10, the double-layer impeller 10 further comprises a middle disc, the middle disc is positioned between the front disc 11 and the rear disc 13, and a matching hole for the driving shaft of the motor 20 to extend into and match with is formed in the middle disc.

The surface of the volute 30 facing the front disc 11 is provided with a front air inlet 34, and the front air inlet 34 is used as a main air inlet; the surface of the volute 30 facing the rear disc 13 is opened with a rear air inlet 35. Specifically, the volute 30 generally includes a front volute plate 31, a shroud volute plate 32 and a back volute plate 33, the front volute plate 31 and the back volute plate 33 are respectively disposed at two opposite ends of the shroud volute plate 32, the front disk 11 is disposed near the front volute plate 31, the back disk 13 is disposed near the back volute plate 33, the front volute plate 31 is provided with a front air inlet 34, the back volute plate 33 is provided with a back air inlet 35, and the motor support 40 is generally fixed to the back volute plate 33.

Generally, when the motor 20 is operated at a high speed, a large amount of heat is generated, and if the heat is not dissipated in time, the performance of the motor 20 and the life of the motor 20 are affected. For this reason, the common form is to open heat dissipation holes on the back disk 13 (single-layer impeller 10) or the middle disk (double-layer impeller 10) of the impeller 10, and the volute back plate 33 is also opened (back air inlet 35), so as to form forced convection to dissipate heat of the end cover of the motor 20 through the air flow injection effect.

The impeller 10 is a working component of the centrifugal fan, and the motor 20 is a driving source of the impeller 10. When the impeller 10 is driven by the motor 20 to run at a high speed, a large negative pressure region is generated inside the impeller 10, and under the action of pressure difference, a part of air flow enters the impeller 10 from the air inlet ring, and a part of air flow enters from the opening of the volute casing back plate 33. Enters the volute 30 under the action of the centrifugal force of the impeller 10 and is finally discharged through the outlet of the volute 30.

Please refer to the above embodiments for the specific structure of the motor bracket 40 in the centrifugal fan of the present invention, because the centrifugal fan adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The motor support 40 is arranged in the rear air inlet 35 of the volute back plate 33, and the abdicating hole 44 on the motor support 40 is coaxially arranged with the impeller 10, so that the driving shaft of the motor 20 and the impeller 10 are ensured to be coaxial, and the impeller 10 is driven to rotate more stably. Specifically, the main body portion 41 of the motor bracket 40 is connected to the volute back plate 33, and optionally, the motor bracket 40 is integrally formed with the volute back plate 33. When traditional motor support 40 and spiral case backplate 33 integrated into one piece, when motor 20 through screw 60 fastening, spiral case backplate 33 is very easily by tensile deformation to make the plane degree variation of motor support 40, influence impeller 10, spiral case front bezel 31, the concentricity of air inlet circle and motor support 40 four, thereby change impeller 10 and air inlet circle axial, radial clearance, and then unfavorable in fan performance. In this embodiment, on the premise of not changing the material strength and the material thickness of the volute back plate 33, the local strength of the motor support 40 is increased, so that when the motor 20 is fastened, the motor support 40 is not easy to stretch and deform, thereby ensuring the concentricity of the impeller 10, the volute 30 and the air inlet ring, ensuring the key parameters of fan design, improving the stability of a fan system, and improving the detachable times of the motor 20. In other embodiments, the motor bracket 40 may be provided separately from the volute back plate 33, and a connection hole is provided in the connection portion of the motor bracket 40 and connected to the volute back plate 33 by a fastening member such as a screw 60.

The volute back plate 33 itself may be configured to have a concave-convex structure, that is, a plurality of concave-convex structures are formed on the volute back plate 33, so that the strength of the volute back plate 33 itself can be improved, and the tensile deformation of the volute back plate 33 is reduced.

In one embodiment, a shock absorbing pad 50 is disposed between the fixing flange 21 and the main body 41. The shock absorbing pad 50 can prevent the fixing flange 21 from directly contacting the motor bracket 40, so that the vibration transmitted from the motor 20 to the motor bracket 40 can be reduced. The cushion 50 is generally annular and is disposed around the mounting hole 45.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A centrifugal fan, comprising:

a volute including a volute back plate;

an impeller disposed within the volute;

the motor support comprises a main body part and a sunken part, wherein the main body part is connected with the volute back plate, the main body part is provided with a yielding hole, the yielding hole is used for a motor to penetrate through, the sunken part is formed by the main body part along the axis direction of the yielding hole in a sunken mode, the main body part is provided with the sunken part, the sunken part extends to the hole wall of the yielding hole, the sunken part is annular, the connecting wall between the sunken part and the main body part is annular, the bottom of the sunken part is provided with a plurality of mounting holes, the mounting holes are arranged at intervals along the circumferential direction of the yielding hole, and the mounting holes are used for fixing the motor; and the number of the first and second groups,

the motor extends into the abdicating hole, a fixed convex edge is arranged on the outer peripheral surface of the motor, a fixed hole is arranged on the fixed convex edge and corresponds to each mounting hole, and the fixed convex edge is abutted against the main body part;

the motor bracket and the volute back plate are integrally formed.

2. The centrifugal fan according to claim 1, wherein a connecting wall between the recess and the main body is inclined such that an opening of the recess is gradually enlarged.

3. The centrifugal fan of claim 2, wherein an angle between the connecting wall and an axis of the mounting hole is greater than or equal to 10 ° and less than or equal to 70 °.

4. The centrifugal fan of claim 1, wherein the depression depth of the depression is greater than or equal to 1mm and less than or equal to 5 mm.

5. The centrifugal fan as claimed in claim 1, wherein the hole edge of the mounting hole is folded toward the recess of the recess to form a turn-up.

6. The centrifugal fan of claim 1, wherein a shock pad is disposed between the stationary ledge and the main body portion.