CN116733772A - Motor impeller and fan - Google Patents

Abstract

The invention relates to the technical field of smoke machines and discloses a motor impeller and a fan, wherein the motor impeller comprises an impeller assembly, a stator assembly and an end cover, the impeller assembly comprises a plurality of blades, a plurality of first rotary guide vanes and a motor shell which are integrally injection molded, the plurality of blades are uniformly distributed on the circumferential edge of the impeller assembly along the circumferential direction, the motor shell is symmetrically positioned in the middle of the impeller assembly, and the outer edge of the motor shell is connected with the blades; the stator assembly is coaxially arranged on the motor shell; the end cover comprises a second rotary guide vane and a motor cover which are integrally injection molded, the motor cover is coaxially arranged at the opening end of the motor casing, and the first rotary guide vane and the second rotary guide vane are identical in structure and are symmetrically arranged on two sides of the motor casing along the axial direction. The integrated structure is convenient for process, has reduced the installation process of impeller and motor, the cost is reduced. The motor impeller reduces the airflow attack angle of the inlet end of the blade, thereby reducing noise; the vortex in a low-speed area of the air outlet of the air channel close to the volute tongue is restrained, so that the noise of the whole machine is reduced, and the efficiency is improved.

Description

Motor impeller and fan

Technical Field

The invention relates to the technical field of smoke machines, in particular to a motor impeller and a fan.

Background

Due to the action of the rotating impeller and inlet guide vanes on the incoming air flow, the air flow has been gradually changed from axial flow to a spiral motion before entering the impeller, which is called pre-rotation before the inlet of the impeller blades. The pre-rotation causes the inlet edge of the impeller blade to generate a circumferential component of absolute velocity, the value of which cannot be calculated by a theoretical method at present and can only be calculated by test data, and thus the inlet velocity triangle is changed.

The traditional centrifugal fan design method assumes that the impeller inlet is radial air inlet, and no pre-rotation exists. In fact, an impeller with multiple blades is likely to have an effect on the incoming flow before it enters the impeller when it rotates at high speed. The factor of pre-rotation has therefore been a point of less concern in industry design. The existing range hood impeller is generally made of sheet metal materials, is limited by a process, is single in impeller form and has fewer pre-rotation design structures. The motor is generally an inner rotor motor, and the cantilever beams and the motor shaft positions are asymmetrically arranged, so that a targeted structure is difficult to set in the middle of the impeller.

Therefore, in the prior art, an integrated structure of an airfoil impeller motor is provided, an injection molding process is mainly adopted, the inter-blade flow separation condition of a traditional sheet metal impeller with single thickness is improved, but the pre-rotation condition of an impeller inlet is not improved, and the noise is serious.

Therefore, there is a need to design a motor impeller and a fan with the motor impeller to solve the above technical problems.

Disclosure of Invention

Based on the problems, the invention aims to provide a motor impeller which is easy to process and assemble, effectively improves the pre-rotation condition of an impeller inlet and reduces noise.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a motor impeller, comprising:

the impeller assembly comprises a plurality of blades, a plurality of first rotary guide vanes and a motor casing which are integrally injection molded, wherein the blades are uniformly distributed on the circumferential edge of the impeller assembly along the circumferential direction, the motor casing is symmetrically positioned in the middle of the impeller assembly, and the outer edge of the motor casing is connected with the blades;

the stator assembly is coaxially arranged on the motor shell;

the end cover comprises a second rotary guide vane and a motor cover which are integrally injection molded, the motor cover is coaxially arranged at the opening end of the motor casing, and the first rotary guide vane and the second rotary guide vane are identical in structure and are symmetrically arranged at two sides of the motor casing along the axial direction.

As the preferable technical scheme of the motor impeller, the section length of the first rotary guide vane is gradually shortened from the center to the end face, the inlet section edge line of the first rotary guide vane and the axis of the impeller assembly form a preset included angle, and the outlet section edge line of the first rotary guide vane is parallel to the axis of the impeller assembly.

As the preferable technical scheme of the motor impeller, the preset included angle is 5-20 degrees.

As the preferable technical scheme of the motor impeller, the blades are forward blades, and the first rotary guide vanes and the second rotary guide vanes are backward blades.

As the preferable technical scheme of the motor impeller, the value range of the guide vane outlet angle of the first rotary guide vane is 20-150 degrees, and the value range of the guide vane inlet angle of the first rotary guide vane is 20-70 degrees.

As the preferable technical scheme of the motor impeller, the ratio of the height of the first rotary guide vane to the height of the blade is 0.2-1.

As the preferable technical scheme of the motor impeller, the wheel diameter ratio of the first rotary guide vane is 0.3-0.8, and the wheel diameter ratio of the blade is 0.3-0.75.

As the preferable technical scheme of the motor impeller, the blades, the first rotary guide vanes and the second rotary guide vanes are arc-shaped blades.

As a preferable technical scheme of the motor impeller, the first rotary guide vane extends outwards along the radial direction and is connected with the corresponding blade to form a long blade, the blade which is not connected with the first rotary guide vane is a short blade, the short blade is a forward blade, and the long blade and the short blade are uniformly inserted and distributed along the circumferential direction;

the long blade comprises a forward section and a backward section, the forward section is identical to the short blade in shape and size, and the backward section is tangentially connected with the forward section.

As the preferable technical scheme of the motor impeller, the wheel diameter ratio of the short blades is 0.75-0.95, and the wheel diameter ratio of the long blades is 0.2-0.7.

As the preferable technical scheme of the motor impeller, the outer end face of the backward section of the long blade is provided with a chamfer.

As the preferable technical scheme of the motor impeller, the ratio of the number of the long blades to the number of the short blades is 0.1-0.5.

Another object of the present invention is to provide a fan that is low cost and low noise.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a fan comprising a motor impeller according to any one of the above claims.

Compared with the prior art, the invention has the following beneficial effects:

the motor impeller provided by the invention comprises the impeller assembly, the stator assembly and the end cover which are coaxially arranged, wherein the impeller assembly comprises a plurality of blades, a plurality of first rotary guide vanes and a motor shell which are integrally injection molded, the integrally molded structure of the impeller assembly is convenient to process, the installation procedures of the impeller and the motor are greatly reduced, the cost is reduced, the installation accumulated error is obviously reduced, and the motor impeller precision is higher. The motor shell is symmetrically arranged in the middle of the impeller assembly, and the first rotary guide vane and the second rotary guide vane can be symmetrically arranged on two sides of the motor shell, so that on one hand, axially entering air flow can be guided and accelerated, the pre-rotation of the front end of the motor impeller is corrected, the air flow attack angle of the inlet end of the blade is reduced, and the noise is reduced; on the other hand, under the acceleration action of the rotary guide vane, the radial airflow speed can be improved, and the vortex of the low-speed area of the wind outlet of the wind channel close to the volute tongue is restrained, so that the noise of the whole machine is reduced, and the efficiency is improved; the symmetrical structure makes the left and right air intake even, further optimizes the noise.

The fan provided by the invention comprises the motor impeller, and is low in manufacturing cost and small in noise.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic diagram of an exploded structure of a motor impeller according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a motor impeller according to an embodiment of the present invention;

FIG. 3 is a side view of a motor impeller according to an embodiment of the present invention;

FIG. 4 is an isometric view of a motor impeller according to an embodiment of the present invention;

FIGS. 5 and 6 are schematic diagrams illustrating dimensioning of a motor impeller according to a first embodiment of the present invention;

FIG. 7 is a side view of a motor impeller according to a second embodiment of the present invention;

fig. 8 is an isometric view of a motor impeller according to a second embodiment of the present invention;

fig. 9 and fig. 10 are schematic views of airflow partitions of a motor impeller according to a second embodiment of the present invention.

In the figure:

1-an impeller assembly; 11-leaf; 12-a first rotary vane; 13-a motor housing; 111-short leaves; 121-forward section; 122-backward section;

a 2-stator assembly; 21-a motor stator; 22-motor shaft;

3-end caps; 31-a second rotary vane; 32-motor cover.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Example 1

As shown in fig. 1, the present embodiment provides a motor impeller, which includes an impeller assembly 1, a stator assembly 2 and an end cover 3, which are coaxially installed. The impeller assembly 1 is a rotating component and is formed by integral injection molding, as shown in fig. 1 to 4, the impeller assembly comprises a plurality of blades 11, a plurality of first rotary guide vanes 12 and a motor casing 13, the plurality of blades 11 are uniformly distributed on the circumferential edge of the impeller assembly 1 along the circumferential direction, the motor casing 13 is symmetrically positioned in the middle of the impeller assembly 1, the motor adopts a thin motor, the motor casing 13 is disc-shaped and has a thin thickness, and the outer edge of the motor casing 13 is connected with the blades 11 which are uniformly distributed on the outer side of the motor casing. The blade 11 is in principle perpendicular to the motor casing 13, which is beneficial to the integral demoulding, and a certain angle can be formed between the blade and the motor casing 13 according to the actual situation.

The stator assembly 2 is a fixed component, and the stator assembly 2 is coaxially mounted to the motor casing 13. The stator assembly 2 comprises a motor stator 21 and a motor shaft 22, the motor shaft 22 is arranged on the motor stator 21 in a penetrating way, and two ends of the motor shaft 22 respectively extend out of through holes on the motor shell 13 and the motor cover 32. The specific structure of the stator assembly 2 is not a protective focus of this embodiment.

The end cover 3 comprises a second rotary guide vane 31 and a motor cover 32 which are integrally injection molded, the motor cover 32 is coaxially arranged at the opening end of the motor casing 13, and the first rotary guide vane 12 and the second rotary guide vane 31 are identical in structure and symmetrically arranged on two sides of the motor casing 13 along the axial direction.

The integrated structure of impeller subassembly 1 in this embodiment is convenient for process, has significantly reduced the installation process of impeller and motor, and the cost is reduced, and is showing and has reduced the installation accumulated error, makes motor impeller precision higher. The motor and the impeller are integrally and symmetrically designed by adopting a centrally arranged outer rotor motor, and the first rotary guide vane 12 and the second rotary guide vane 31 can be symmetrically arranged on two sides of the motor shell 13, so that on one hand, axially entering air flow can be guided and accelerated, the pre-rotation of the front end of the impeller of the motor is corrected, and the air flow attack angle of the inlet end of the blade 11 is reduced, thereby reducing noise; on the other hand, under the acceleration action of the rotary guide vane, the radial airflow speed can be improved, and the vortex of the low-speed area of the wind outlet of the wind channel close to the volute tongue is restrained, so that the noise of the whole machine is reduced, and the efficiency is improved; the symmetrical structure makes the left and right air intake even, further optimizes the noise.

Since the first rotary vane 12 and the second rotary vane 31 have the same structure, the present embodiment will be described taking the first rotary vane 12 as an example.

In this embodiment, the cross-sectional length of the first rotary vane 12 gradually shortens from the center, that is, the motor casing 13 toward the end face direction, and the inlet section edge line of the first rotary vane 12 forms a preset included angle with the axis of the impeller assembly 1, and the outlet section edge line of the first rotary vane 12 is parallel with the axis of the impeller assembly 1. The structure can enlarge the inlet length of the first rotary guide vane 12, ensure the maximum working capacity of the first rotary guide vane 12, and ensure the air inlet area of the first rotary guide vane 12, thereby ensuring the overall air performance efficiency. Optionally, the preset included angle is 5 ° -20 °, for example, may be 5 °, 10 °, 15 °, 20 °, and the like, and the angle range may further increase the air inlet area of the first rotary vane 12, so as to ensure the air inlet amount.

Further, the blades 11 are forward blades, and the first rotary vane 12 and the second rotary vane 31 are backward blades. In this embodiment, compared with the vane 11, the first rotary vane 12 and the second rotary vane 31 are closer to the center of the impeller assembly 1, the air flow enters the impeller from the center in the axial direction, after being guided and distributed by the rotary vanes, the air flow flows out of the impeller through the vane 11 after being converted from the axial direction into the radial direction, and the radial distribution of the air flow among the vanes 11 is more uniform by the structural arrangement, so that the attack angle of the air flow at the inlet of the vane 11 is reduced, the inlet impact loss of the vane 11 is effectively reduced, the noise is reduced, and the efficiency is improved.

Further, it is preferable that the outlet angle of the first rotary vane 12 be such that the absolute velocity of the airflow outlet coincides with the absolute velocity direction of the impeller inlet. Accordingly, the first rotary vane 12 may be designed to be a single arc or a multi-segment arc depending on the actual situation. As shown in fig. 5, the value of the guide vane outlet angle β4a of the first rotary guide vane 12 in the present embodiment ranges from 20 ° to 150 °, and the value of the guide vane inlet angle β3a of the first rotary guide vane 12 ranges from 20 ° to 70 °. Optionally, the first rotary vane 12 has a vane outlet angle of 20 °, 40 °, 60 °, 90 °, 110 °, 130 °, 150 °, etc., and a vane inlet angle of 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, etc.

Alternatively, as shown in FIG. 6, the ratio of the height h2 of the first rotary vane 12 to the height h1 of the blade 11 is 0.2-1. Further alternatively, the first rotary vane 12 has a wheel diameter ratio D4/D3 of 0.3-0.8 and the blade 11 has a wheel diameter ratio D1/D2 of 0.3-0.75.

The blades 11, the first rotary vane 12 and the second rotary vane 31 in the present embodiment are all arc-shaped blades. By the arrangement, the guide surfaces of the blades 11, the first rotary guide vanes 12 and the second rotary guide vanes 31 are arc-shaped, and the air can be guided more smoothly. Of course, the blades 11, the first rotary vane 12 and the second rotary vane 31 may also have other shapes, such as a straight plate structure.

Alternatively, the first rotary vane 12 and the second rotary vane 31 may have a single thickness, or may have a variable thickness, and may be designed according to practical situations.

The embodiment also provides a fan, which comprises the motor impeller. The fan has the advantages of less assembly procedures, low manufacturing cost, lower noise in the operation process and smaller air quantity loss. The development of the beneficial effects is substantially similar to that of the motor impeller described above, and therefore will not be described in detail herein.

Example two

The present embodiment provides a motor impeller having a structure substantially the same as that of the motor impeller of the first embodiment, except that:

as shown in fig. 7 and 8, in this embodiment, all the blades 11 include two types of long blades and short blades 111, specifically, the first rotary vane 12 extends radially outwards to connect with the corresponding blade 11 to form a long blade, the blade 11 not connected with the first rotary vane 12 is the short blade 111, the short blade 111 is a forward blade, the long blade and the short blade 111 are uniformly and alternately distributed along the circumferential direction, that is, one long blade is arranged every fixed number of short blades 111 at intervals, and the gap between every two adjacent blades 11 (including the long blade and the short blade 111) is equal; the long blade includes a forward section 121 and a backward section 122, the forward section 121 is a forward blade, the backward section 122 is a backward blade, the forward section 121 is the same as the short blade 111 in shape and size, and the backward section 122 is tangentially connected with the forward section 121.

Optionally, the connection position of the rearward section 122 and the forward section 121 is smoothly transitioned. So set up, back section 122 and preceding section 121 pass through the circular arc transition, and the wind flow also can be smoothly by back section 122 water conservancy diversion to preceding section 121 in-process of wind-guiding, and the windage is less, and air loss is little.

Further alternatively, the wheel diameter ratio D1/D2 of the short blades 111 is 0.75-0.95, and the wheel diameter ratio D3/D2 of the long blades is 0.2-0.7, which can further reduce wind dryness and wind loss.

Preferably, the outer end surface of the rearward section 122 of the long blade is provided with a chamfer. Through this setting for impeller import increases, increases the intake, and plays the direction to the air current, makes the air current distribute evenly.

In the present embodiment, the ratio of the number of long blades to the number of short blades 111 is 0.1 to 0.5, for example, 0.1, 0.3, 0.5, etc., and may be designed according to the air intake amount.

In this embodiment, by the design of the long and short blades 111, three flow areas are formed inside the impeller, as shown in fig. 9 and 10, when the impeller works, air flow mainly enters the impeller from the inlet area a, and the air flow is vertically upwards from the lower part of the smoke machine and is turned to be axial. The area B is an acceleration distribution area, and the air flow is changed from the axial direction to the radial direction through the guiding and distribution of the rotary guide vane, namely the backward section 122 of the long blade, so that the radial distribution of the air flow among the short blades 111 is more uniform, the attack angle of the air flow at the inlet of the short blades 111 is reduced, the loss is reduced, and the efficiency is improved; and the air flow is accelerated, which is beneficial to eliminating the low-speed area of the volute tongue position. The C area is a centrifugal acceleration area, the air flow is acted by the blades 11, is further accelerated in the reduction flow channel and is thrown out of the impeller. Preferably, the blades 11, i.e. the short blades 111 and the forward sections 121 of the long blades, are here strong forward curved blades 11, which allow the fan to have a large flow rate while also being able to boost the pressure.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (13)

1. A motor impeller, comprising:

the impeller assembly (1), the impeller assembly (1) comprises a plurality of blades (11), a plurality of first rotary guide vanes (12) and a motor casing (13) which are integrally injection molded, the plurality of blades (11) are uniformly distributed on the circumferential edge of the impeller assembly (1) along the circumferential direction, the motor casing (13) is symmetrically positioned in the middle of the impeller assembly (1), and the outer edge of the motor casing (13) is connected with the blades (11);

a stator assembly (2), wherein the stator assembly (2) is coaxially arranged on the motor shell (13);

the end cover (3), end cover (3) include integrative injection moulding's second rotary guide vane (31) and motor cover (32), motor cover (32) coaxial arrangement in the open end of motor casing (13), first rotary guide vane (12) with second rotary guide vane (31) structure is the same and along axial symmetry be located the both sides of motor casing (13).

2. The motor impeller of claim 1, wherein,

the section length of the first rotary guide vane (12) is gradually shortened from the center to the end face, an inlet section edge line of the first rotary guide vane (12) and the axis of the impeller assembly (1) form a preset included angle, and an outlet section edge line of the first rotary guide vane (12) is parallel to the axis of the impeller assembly (1).

3. The motor impeller of claim 2, wherein,

the preset included angle is 5-20 degrees.

4. The motor impeller of claim 1, wherein,

the blades (11) are forward blades, and the first rotary guide vanes (12) and the second rotary guide vanes (31) are backward blades.

5. The motor impeller of claim 4, wherein,

the value range of the guide vane outlet angle of the first rotary guide vane (12) is 20-150 degrees, and the value range of the guide vane inlet angle of the first rotary guide vane (12) is 20-70 degrees.

6. The motor impeller of claim 1, wherein,

the ratio of the height of the first rotary vane (12) to the height of the blade (11) is 0.2-1.

7. The motor impeller of claim 1, wherein,

the wheel diameter ratio of the first rotary guide vane (12) is 0.3-0.8, and the wheel diameter ratio of the blade (11) is 0.3-0.75.

8. The motor impeller according to any one of claims 1 to 7, wherein,

the blades (11), the first rotary guide vanes (12) and the second rotary guide vanes (31) are all arc-shaped blades.

9. The motor impeller of claim 1, wherein,

the first rotary guide vanes (12) extend outwards along the radial direction and are connected with the corresponding blades (11) to form long blades, the blades (11) which are not connected with the first rotary guide vanes (12) are short blades (111), the short blades (111) are forward blades, and the long blades and the short blades (111) are uniformly and alternately distributed along the circumferential direction;

the long blade comprises a forward section (121) and a backward section (122), the forward section (121) is identical to the short blade (111) in shape and size, and the backward section (122) is tangentially connected with the forward section (121).

10. The motor impeller of claim 9, wherein,

the ratio of the diameter of the short blades (111) is 0.75-0.95, and the ratio of the diameter of the long blades is 0.2-0.7.

11. The motor impeller of claim 9, wherein,

the outer end face of the backward section (122) of the long blade is provided with a chamfer.

12. The motor impeller of claim 9, wherein,

the ratio of the number of long blades to the number of short blades (111) is 0.1-0.5.

13. A fan comprising a motor impeller according to any one of claims 1-12.