CN112879323B

CN112879323B - Air supply device

Info

Publication number: CN112879323B
Application number: CN201911200028.9A
Authority: CN
Inventors: 吕琢; 周亚运
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2023-03-14
Anticipated expiration: 2039-11-29
Also published as: CN112879323A

Abstract

The application belongs to the technical field of the fan, especially, relate to an air supply arrangement, air supply arrangement includes: the air inlet and the air outlet are formed at two ends of the air cover respectively; the movable impeller is arranged in the fan cover and close to the air inlet; the driving mechanism is in driving connection with the movable impeller so as to drive the movable impeller to rotate in the fan cover; the diffuser is fixed in the fan housing and near the air outlet, the diffuser includes a diffuser base and a plurality of static blades arranged on the peripheral wall of the diffuser base at annular intervals, the inlet lay angle of the static blades is set to be 25-60 degrees, and the outlet lay angle of the static blades is set to be 20-90 degrees. Through the setting to the stator blade angle of laying, the air current has great import when the stator blade, has reduced the fluid resistance, effectively reduces the kinetic energy loss when the inside fluid of air supply arrangement passes through the diffuser, promotes working property, reduces power consumption, can realize the function of diffusion again.

Description

Air supply device

Technical Field

The application belongs to the technical field of fans, and particularly relates to an air supply device.

Background

With the improvement of living standard of people, various air supply devices such as handheld dust collectors and the like appear on the market, and air supply devices used in the air supply devices are small in size and high in rotating speed generally ranging from 8 to 15 ten thousand rpm. In order to convert kinetic energy of air flow into air pressure energy and make the air flowing out blow farther, a diffuser is often arranged in the air supply device, but because of unreasonable design, the air flow passes through the rear diffuser in the flowing process to cause great flowing loss, so that the efficiency of the air supply device is low, and the power consumption of the air supply equipment is high.

Disclosure of Invention

An object of the application is to provide an air supply arrangement, aim at solving the air supply equipment among the prior art because the air current is great at the in-process kinetic energy loss that flows in inside, and then lead to the technical problem that efficiency is lower, power consumption is great.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: an air supply arrangement comprising:

the air inlet and the air outlet are formed at two ends of the air cover respectively;

the movable impeller is arranged in the fan cover and close to the air inlet;

the driving mechanism is in driving connection with the movable impeller so as to drive the movable impeller to rotate in the fan cover;

the diffuser is fixed in the fan housing and near the air outlet, the diffuser includes a diffuser base and a plurality of static blades arranged on the peripheral wall of the diffuser base at annular intervals, the inlet lay angle of the static blades is set to be 25-60 degrees, and the outlet lay angle of the static blades is set to be 20-90 degrees.

In one embodiment, a plane passing through the central axis of the diffuser is a meridian plane, on the meridian plane, a projection of the head of the stationary blade forms a leading edge line, a curve obtained by projection of the leading edge line and the diffuser base is a tangent line at an intersection point along the curve, and an included angle between the tangent line and the central axis of the diffuser is 30-70 degrees.

In one embodiment, on the meridian plane, a projection of the tail of the stationary blade forms a tail edge line, an included angle between the leading edge line and a tangent line of a curve obtained by projection of the diffuser base at an intersection point is set to be 70-110 °, and an included angle between the tail edge line and a tangent line of a curve obtained by projection of the diffuser base at an intersection point is set to be 70-110 °.

In one embodiment, the inner surface of the fan housing comprises a first part and a second part, the first part is arranged in an equal diameter mode, the second part is of a diameter-variable structure, and the diameter of the second part is gradually increased from the air inlet to the air outlet.

In one embodiment, the diffuser base includes an upper section and a lower section, the upper section is of a diameter-variable structure, an outer diameter of the upper section gradually increases from the air inlet to the air outlet, an outer surface of the lower section is of an equal-diameter structure, and a position of the lower section corresponds to a position of the first portion.

In one embodiment, the second portion includes a first arc surface and a second arc surface connected to each other, the first arc surface is disposed near the air outlet and is a concave arc surface, and the second arc surface is disposed near the air inlet and is a convex arc surface; the movable impeller comprises a movable impeller base and a plurality of movable blades arranged on the outer surface of the movable impeller base, the outer surface of the movable impeller base is inwards concave to form an arc surface, the outer diameter of the movable impeller base is gradually increased from the air inlet to the air outlet, the position of the first arc surface corresponds to the position of the upper section, the position of the second arc surface corresponds to the position of the outer surface of the movable impeller base, the curvature of the outer surface of the upper section is smaller than that of the first arc surface, and the curvature of the outer surface of the movable impeller base is larger than that of the second arc surface.

In one embodiment, an inner convex ring and an outer convex ring are convexly formed on one side, close to the movable impeller, of the upper section, an annular groove is formed between the inner convex ring and the outer convex ring, and one end, far away from the air inlet, of the movable impeller is accommodated in the annular groove in a matched mode.

In one embodiment, there is a gap between the tips of the stationary blades and the inner surface of the wind shield and the gap at the narrowest point is 0.1mm.

In one embodiment, air supply arrangement still includes the frame, the frame includes casing and installation department, the casing is the tube-shape and locates the air outlet department of fan housing, the installation department is including locating bearing chamber in the casing with connect in bearing chamber with between the casing and a plurality of ribs of interval each other, the diffuser cover is located the bearing chamber is outdoor and support and lean on in a plurality of on the rib, adjacent two form between the rib air supply arrangement's air-out passageway.

In one embodiment, inclined protrusions are respectively arranged at one end, close to the casing, of each rib, the inclined directions of the protrusions are the same, each protrusion comprises a protrusion head and a protrusion root which are connected, the protrusion roots are connected with the ribs, and the thickness of each protrusion is gradually reduced from the protrusion roots to the protrusion heads.

In one embodiment, the following relationship exists between the inlet placement angle a of the lobes and the outlet placement angle β of the diffuser: a = β ± 10 °.

In one embodiment, the driving assembly comprises a circuit board and a motor electrically connected to the circuit board, wherein a rotating shaft of the motor is connected with the movable impeller, and the circuit board is provided with a lead wire for connecting with an external power supply.

In one embodiment, a part of the motor is sleeved at one end of the frame far away from the diffuser, the motor is fixedly connected with the rib, and the circuit board is fixed at one end of the motor far away from the diffuser.

The beneficial effects of the embodiment of the application are as follows: the air supply arrangement of this application embodiment is equipped with movable vane wheel and diffuser in the fan housing, set up the entry lay angle of the stationary blade on the diffuser periphery wall to 25 ~ 60 °, export lay angle sets up to 20 ~ 90 °, through the setting to stationary blade lay angle, the air current has great import when through the stationary blade, fluid resistance has been reduced, effectively reduce the kinetic energy loss when the inside fluid of air supply arrangement passes through the diffuser, promote working property, reduce power consumption, can realize the function of diffuser again.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a cut-away view of an air supply device provided in an embodiment of the present application;

FIG. 2 is a sectional view of the blower device provided in the embodiment of the present application from another direction;

FIG. 3 is a schematic perspective view of a diffuser in the blower device shown in FIG. 1;

FIG. 4 is a planar cascade view of a diffuser in the blower apparatus of FIG. 1;

FIG. 5 is a cutaway view of a diffuser in the blower apparatus of FIG. 1;

FIG. 6 is a meridian plane projection schematic diagram of a diffuser in the blower of FIG. 1;

FIG. 7 is a projection of a diffuser in the blower device of FIG. 1 in a meridian plane;

FIG. 8 is a schematic perspective view of a frame of the blower of FIG. 1;

fig. 9 is a schematic perspective view of a frame of an air supply device according to another embodiment of the present disclosure;

FIG. 10 is a cross-sectional view of the blower shown in FIG. 9;

fig. 11 is a cross-sectional expanded view of a projection on a frame in the blower device shown in fig. 9.

Wherein, in the figures, the respective reference numerals:

100-wind cover; 200-movable impellers; 300-a drive mechanism; 400-a diffuser; 500-a frame; 101-an air inlet; 102-an air outlet; 110-a first portion; 120-a second portion; 121-a first arc surface; 122-second arc; 130-inner chamfer angle; 210-moving impeller base; 220-moving blades; 310-a motor; 320-a circuit board; 311-a stator assembly; 312-a rotor assembly; 313-a bearing; 314-a spindle; 315-connecting column; 401-diffuser center axis; 402-meridian plane; 403-projection of stationary blades; 410-a diffuser base; 411-upper section; 412-lower segment; 420-stationary blades; 421-stationary blade head; 422-stationary blade tail; 423-forehead line; 424-rear line; 425-midline; 426-a first tangent line; 427-a second tangent; 428-third tangent line; 429-fourth tangent; 431-inner convex ring; 432-outer convex ring; 433-an annular groove; 441-leading edge line; 442-trailing edge line; 443-curve; 444-fifth tangent line; 445-sixth tangent line; 501-an air outlet channel; 510-a housing; 511-a plug-in part; 520-a mounting portion; 521-a bearing chamber; 530-ribs; 531-mounting holes; 532-supporting the table top; 540-protrusions; 541-a convex head; 542-root of projection; 543-forehead line; 544-the rear frontal line; 545-midline; 546-seventh tangent.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

As shown in fig. 1 to 3, the air supply device provided in the embodiment of the present application may be, but is not limited to, a dust collector, a hand dryer, a fan, an air pump, a range hood, an air cleaning device, or a centrifugal pump. The air supply device comprises a fan cover 100, an impeller 200, a driving mechanism 300 and a diffuser 400, wherein the fan cover 100, the impeller 200 and the diffuser 400 can be coaxially arranged. An air inlet 101 and an air outlet 102 are formed at both ends of the hood 100, respectively. The movable impeller 200 is rotatably disposed in the fan housing 100, and the movable impeller 200 is completely accommodated in the fan housing 100 and located at one end close to the air inlet 101; the impeller 200 includes an impeller base 210 and a plurality of blades 220 provided on an outer circumferential side of the impeller base 210 at intervals, and the impeller base 210 is formed in a substantially truncated cone shape as a whole, and has an outer diameter gradually increasing in a direction from the air inlet 101 to the air outlet 102, and a smooth curved surface is formed on an outer surface thereof. The driving mechanism 300 is in driving connection with the movable impeller 200, and the driving mechanism 300 is used for driving the movable impeller 200 to rotate in the wind shield 100. The diffuser 400 is fixed in the fan housing 100, is completely accommodated in the fan housing 100, and is disposed near the air outlet 102, and air enters from the air inlet 101 of the fan housing 100, passes through the impeller 200 and the diffuser 400, and is then discharged from the air outlet 102; the diffuser 400 includes a diffuser base 410 and a plurality of stationary blades 420 circumferentially spaced on an outer circumferential wall of the diffuser base 410, and each of the stationary blades 420 may be circumferentially arranged at equal intervals, as shown in fig. 5, an inlet installation angle of the stationary blade 420 is set to 25 ° to 60 °, an outlet installation angle of the stationary blade 420 is set to 20 ° to 90 °, the inlet installation angle is an inlet installation angle of the stationary blade head 421, and the outlet installation angle is an outlet installation angle of the stationary blade tail 422. By increasing the diffuser 400 and the setting angle of the fixed blades 420, the kinetic energy loss of the fluid in the air supply device when passing through the diffuser 400 can be effectively reduced, the working performance is improved, and the power consumption is reduced.

The air supply arrangement that this embodiment provided, be equipped with movable vane wheel 200 and diffuser 400 in fan housing 100, set up the entry lay angle of stationary blade 420 on the diffuser 400 periphery wall to 25 ~ 60 °, the export lay angle sets up to 20 ~ 90, through setting up stationary blade 420 lay angle, the air current has great import when stationary blade 420 passes through, the fluid resistance has been reduced, effectively reduce the kinetic energy loss of the inside fluid of air supply arrangement when passing through diffuser 400, promote working property, reduce power consumption, can realize the function of diffusion again.

As shown in fig. 3 to 5, a curved surface having the same shape as the base and a unit thickness is cut at the middle in the blade height direction of the stationary blade 420, and the curved surface is developed in a planar manner to obtain a planar cascade diagram of the diffuser 400. On the plane She Shantu, the connecting line of the corresponding point of the stationary blade head 421 is the forehead line 423 with radius R ₁ The connecting line of the corresponding points of the stator blade tail 422 is the forehead line 424 with radius R ₂ The frontal line 423 and the rear frontal line 424 are cut to obtain the leaf profile and the leafThe curve formed by the midpoints of the thicknesses of the sheets is a midline 425, the inlet placement angle alpha is the included angle between the tangent of the midline 425 at the head of the blade and the tangent of the forehead line 423 at the head of the blade, and the outlet placement angle beta is the included angle between the tangent of the midline 425 at the tail of the blade and the tangent of the forehead line 424 at the tail of the blade.

As shown in fig. 1, 3, and 5, a tangent of the centerline 425 at the blade head is a first tangent 426, a tangent of the forehead line 423 at the blade head is a second tangent 427, a tangent of the centerline 425 at the blade tail is a third tangent 428, a tangent of the forehead line 424 at the blade tail is a fourth tangent 429, an included angle between the first tangent 426 and the second tangent 427 is an inlet placement angle α of the vane 420, and an included angle between the third tangent 428 and the fourth tangent 429 is an outlet placement angle β of the vane 420. The inlet placing angle alpha of the static blades 420 is set to be 25-60 degrees, the outlet placing angle beta of the static blades 420 is set to be 20-90 degrees, good separation of fluid at the front edges of the static blades 420 is facilitated, and smooth flow guiding is realized along the direction of two side surfaces facing the air outlet 102. In this embodiment, the inlet placement angle α may be 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, or 60 °, and the outlet placement angle β may be 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, or 90 °.

In one embodiment, as shown in fig. 6 and 7, for the convenience of understanding, a plane passing through the diffuser central axis 401 is defined as a meridian plane 402, and the outer surface of the diffuser base 410, the inner surface of the wind shield 100, and the surface of the stationary blade 420 are projected on the meridian plane 402 along the arc direction by taking a corresponding point on the diffuser central axis 401 as a center of a circle. On the meridian plane 402, the projection of the stationary blade head 421 forms a leading edge line 441, the projection of the stationary blade tail 422 forms a trailing edge line 442, a curve obtained by the projection of the leading edge line 441 and the diffuser base 410 is a tangent line along the curve at the intersection point, and the included angle between the tangent line and the central axis of the diffuser is 30-70 degrees. In this embodiment, the angle between the tangent and the center axis of the diffuser may be 30 °, 40 °, 50 °, 60 ° or 70 °.

In one embodiment, the leading edge line 441 forms an angle B with a tangent line of a curve projected from the diffuser base 410 onto the meridian plane 402 at the intersection point ₁ ，B ₁ Arranged in the range of 70-110 degrees, and the included angle between the tail edge line 442 and the tangent line of the curve obtained by the projection of the diffuser base 410 on the meridian plane 402 at the intersection point is B ₂ ，B ₂ Is arranged in the range of 70-110 degrees. B1 and B2 can influence the flow direction of a turn in the diffuser, and the separation flow can be reduced to the minimum by proper values. In this embodiment, B ₁ Can be 70 degrees, 80 degrees, 90 degrees, 100 degrees or 110 degrees, and B ₂ Can be 70 degrees, 80 degrees, 90 degrees, 100 degrees or 110 degrees, and B ₁ Can be greater than B ₂ The value of (a).

As shown in fig. 6 and 7, the meridian plane 402 has a projection 403 of the stationary blade 420, the leading edge line 441 and the trailing edge line 442 are respectively formed at both ends of the projection 403 of the stationary blade 420, the diffuser base 410 is projected on the meridian plane 402 to obtain a curve 443, the fifth tangent line 444 is a tangent line formed by the curve 443 at the intersection of the leading edge line 441 and the curve 443, the sixth tangent line 445 is a tangent line formed by the curve 443 at the intersection of the trailing edge line 442 and the curve 443, and an included angle B is formed between the leading edge line 441 and the fifth tangent line 444 ₁ The angle between the trailing edge line 442 and the sixth tangent line 445 is B ₂ 。

In an embodiment, as shown in fig. 1, the inner surface of the wind shield 100 is smooth, the inner surface of the wind shield 100 includes a first portion 110 and a second portion 120, the first portion 110 is disposed in an equal diameter, the second portion 120 is in a diameter-variable structure, and the diameter of the second portion 120 gradually increases from the wind inlet 101 to the wind outlet 102. The fan housing 100 is formed with an inner chamfer 130 at the air inlet 101, the inner diameter of the air inlet 101 gradually decreases from the air inlet 101 to the air outlet 102, the air inlet 101 of the fan housing 100 is formed in an open-type bell mouth shape, and the fan housing 100 has a larger air inlet 101 and can suck more air flow.

In an embodiment, as shown in fig. 1 and 4, the diffuser base 410 includes an upper section 411 and a lower section 412, the upper section 411 is of a diameter-variable structure, an outer diameter of the upper section 411 gradually increases from the air inlet 101 to the air outlet 102, an outer diameter of the lower section 412 is of a constant diameter structure, and an outer diameter of an end of the upper section 411 away from the air inlet 101 is equal to an outer diameter of the lower section 412; the lower section 412 corresponds to the position of the first portion 110 of the inner surface of the hood 100, such that a relatively matched airflow path is formed between the outer surface of the diffuser base 410 and the inner surface of the hood 100.

In an embodiment, as shown in fig. 1 and 4, the second portion 120 includes a first arc surface 121 and a second arc surface 122 connected to each other, the arc surface near one end of the air outlet 102 is the first arc surface 121, the first arc surface 121 is disposed near the air outlet 102 and is an inward concave arc surface, the second arc surface 122 is disposed near the air inlet 101 and is an inward convex arc surface, and the first arc surface 121 and the second arc surface 122 are in smooth transition. The impeller 200 includes an impeller base 210 and a plurality of blades 220 provided on an outer surface of the impeller base 210, and the outer surface of the impeller base 210 is concave inward to form a curved surface, and an outer diameter of the outer surface gradually increases in a direction from the air inlet 101 to the air outlet 102.

The position of the first arc surface 121 corresponds to the position of the upper section 411, the position of the second arc surface 122 corresponds to the position of the outer surface of the movable impeller base 210, and along the axial direction, the projection of the first arc surface 121 covers the projection of the upper section 411, and the projection of the second arc surface 122 covers the projection of the outer surface of the movable impeller base 210; the curvature of the outer surface of the upper section 411 is smaller than that of the first arc surface 121, and the curvature of the outer surface of the movable impeller base 210 is larger than that of the second arc surface 122, so that the air duct formed between the movable impeller base 210 and the inner surface of the fan housing 100 is gradually narrowed, and the width of the airflow channel between the upper section 411 and the inner surface of the fan housing 100 is gradually increased, so that the airflow realizes a pressure expansion function, then flows to the airflow channel with the same width between the lower section 412 and the first portion 110 of the inner surface of the fan housing 100, and finally flows out of the air supply device.

As shown in fig. 1, a smooth transition can be formed between an extension surface of one end of the outer surface of the impeller base 210 close to the diffuser base 410 and an outer surface of the upper section 411, that is, a smooth transition can be formed when an extension surface is added between the outer surfaces of the impeller 200 and the diffuser 400, so that fluid can flow more smoothly between the impeller 200 and the diffuser 400 in the fan cover 100.

In an embodiment, a gap is formed between the blade tip of the stationary blade 420 and the inner surface 100 of the fan cover, and the gap at the narrowest point between the blade tip of the stationary blade 420 and the inner surface of the fan cover 100 is 0.1mm, and extends to both sides at the narrowest point, the gap between the stationary blade 420 and the fan cover 100 is gradually increased, and a small gap value is set between the two, so that the stability of airflow flowing is improved, the airflow is not easy to form turbulent flow at the blade tip, and excessive loss of fluid at the stationary blade 420 is avoided.

In an embodiment, as shown in fig. 1 and 3, an inner annular ring 431 and an outer annular ring 432 are formed in a protruding manner on one side of the upper section 411 close to the movable vane 200, the inner annular ring 431 is located on the inner side of the upper section 411, a gap is formed between the head of the stationary vane 420 and the inner annular ring 431, the inner annular ring 431 and the outer annular ring 432 are coaxially arranged, an annular groove 433 is formed between the inner annular ring 431 and the outer annular ring 432, one end of the movable vane 200, which is far away from the air inlet 101, is fittingly accommodated in the annular groove 433, the movable vane 200 does not touch the groove wall of the annular groove 433 when rotating, the inner annular ring 431 is shielded by the movable vane 200, and only a very small amount of airflow can enter the diffuser 400 from the annular groove 433. The side wall of the annular groove 433 close to the outer side can be obliquely arranged, so that the air supply device is in a vibrating state during operation, and the movable impeller 200 is not easy to touch the wall of the annular groove 433.

As shown in fig. 1 and 4, the tail of the stationary blade 420 is located higher than the diffuser base 410, that is, a part of the stationary blade 420 extends out of the top surface of the diffuser base 410 and extends toward the moving blade 200, so that the air flow passing through the blades of the moving blade 200 can contact the stationary blade 420 more quickly, thereby reducing the intermediate flow path.

In an embodiment, as shown in fig. 1, 2 and 8, the air supply device further includes a frame 500, and the frame 500 includes a housing 510 and a mounting portion 520. The casing 510 is cylindrical and is disposed at the air outlet 102 of the fan housing 100, and two ends of the casing 510 are open; the mounting portion 520 includes a bearing chamber 521 and a plurality of ribs 530, the bearing chamber 521 is disposed in the casing 510, the ribs 530 are connected between the bearing chamber 521 and the casing 510 and spaced apart from each other, and an air outlet channel 501 is formed between adjacent ribs 530, that is, after the air flowing in from the air inlet 101 passes through the moving blades 220 and the stationary blades 420, the air finally flows out from each air outlet channel 501, as shown in fig. 1. The diffuser 400 is sleeved outside the bearing chamber 521 and abutted against the plurality of ribs 530, the upper section 411 of the diffuser 400 is fittingly nested outside the bearing chamber 521, a step is formed on the inner surface of the upper section 411, a supporting table surface 532 is formed at one end of each rib 530 close to the bearing chamber 521, one step surface of the upper section 411 abuts against the supporting table surface 532, and the diffuser 400 and the bearing chamber 521 are clamped and fixed.

In one embodiment, as shown in fig. 9 and 10, the end of each rib 530 close to the casing 510 is provided with an inclined protrusion 540, and the inclined directions of the protrusions 540 are the same and are all inclined around the same direction. The top surface of the protrusion 540 is inclined so that the top surface of the protrusion 540 forms an inclined surface, the inclined surface may be a plane or a cambered surface, the height of the protrusion 540 is set to be smaller than the height of the ribs 530, and the projection of the protrusion 540 in the axial direction is located between two corresponding ribs 530, that is, one end of the protrusion 540 does not extend above the adjacent ribs 530.

Protrusions 540 include protruding head 541 and protruding root 542 that link, protruding root 542 is connected with rib 530, and the thickness of protruding 540 becomes progressively less from protruding root 542 to protruding head 541, and like this, the one side of each arch 540 can form better guide face, and the space that each arch 540 occupy can also reduce. Both sides of the protrusion 540 may be arc surfaces, and the corner of the protrusion head 541 is in smooth transition, which is beneficial to reducing wind resistance and reducing loss of kinetic energy.

In one embodiment, as shown in FIGS. 5, 10, and 11, the inlet setting angle A of the protrusion 540 is related to the outlet setting angle β of the stationary blade 420 as follows: a = beta 10 °, enables the inlet setting angle A of the protrusion 540 to be adapted to the inlet setting angle of the corresponding stationary blade 420, avoids the increase of the fluid resistance caused by the overlarge shearing area of the protrusion 540, and effectively reduces the kinetic energy loss of the fluid inside the air supply device when passing through the rack 500 when the inlet setting angle of the protrusion 540 is in the range, thereby improving the working performance and reducing the power consumption.

As shown in fig. 9 and 11, a concentric circle is cut at a predetermined radius in the middle section of the protrusion 540, and the concentric circle is expanded in a plane to obtain a cross section of the protrusion 540, in which the connecting line of the corresponding points of the protrusion head 541 is the forehead line 543, the connecting line of the corresponding points of the protrusion root 542 is the forehead line 544, the curve connected in the middle of the thickness of the protrusion 540 is called the middle line 545, the inlet installation angle a of the protrusion 540 is the included angle between the seventh tangent 546 of the protrusion head 541 and the forehead line 543 of the middle line 545, and the angle between a and β is suitable for the above relationship, so that the protrusion 540 can play a role in guiding the air flow, and can reduce the wind resistance, thereby reducing the kinetic energy loss.

In one embodiment, as shown in fig. 1, 2 and 8, the driving assembly includes a circuit board 320 and a motor 310, the motor 310 is electrically connected to the circuit board 320, a rotating shaft 314 of the motor 310 is connected to the impeller 200, and the circuit board 320 has a lead (not shown) for connecting to an external power source. The motor 310 includes a stator assembly 311 and a rotor assembly 312, the rotor assembly 312 includes a rotating shaft 314 and a magnetic ring mounted on the rotating shaft 314, a bearing 313 is fixed on the rotating shaft 314 of the rotor assembly 312, an outer diameter of the magnetic ring is smaller than an outer diameter of the bearing 313, the magnetic ring is disposed on a side far away from the movable impeller 200, and the bearing 313 is mounted in a bearing chamber 521 of the frame 500.

The bearing 313 can be installed in the bearing chamber 521 through various suitable manners, and specifically can be fixed in the bearing chamber 521 through a clamping manner or an adhesive; the circuit board 320 is located at an end of the motor 310 remote from the housing 500. The two ends of the bearing chamber 521 are open, the rotating shaft 314 passes through the bearing 313 to be connected and fixed with the movable impeller 200, after the circuit board 320 is powered on, the stator assembly 311 drives the rotor assembly 312 to rotate, and the movable impeller 200 is driven to rotate in the fan housing 100 through the rotating shaft 314. The circuit board 320 may be completely exposed out of the frame 500, which facilitates the wiring operation of the leads and also facilitates the heat dissipation of the circuit board 320; since the circuit board 320 is spaced apart from the air outlet 102 of the air hood 100, the circuit board 320 is prevented from blocking the air outlet 102.

In one embodiment, as shown in fig. 2 and 8, a portion of the motor 310 is sleeved on an end of the frame 500 away from the diffuser 400, the motor 310 is fixed to the rib 530 by a bolt, and the circuit board 320 is fixed to an end of the motor 310 away from the diffuser 400. A portion of the motor 310 and the circuit board 320 are exposed with respect to the chassis 500; the ribs 530 are respectively provided with mounting holes 531, the motor 310 is respectively provided with threaded holes corresponding to the positions of the mounting holes 531, and screws sequentially penetrate through the mounting holes 531 and the threaded holes to connect and fix the rack 500 and the motor 310.

Stator module 311 includes fixing base and iron core, and the fixing base includes the shell and locates the solid fixed ring that is used for adaptation holding magnetic ring in the middle of the shell, is equipped with a plurality of splice bars between shell and the solid fixed ring, and the iron core inlays admittedly in the splice bar, and the quantity of splice bar can set up to equal with the quantity of rib 530, forms the through-hole that runs through between the adjacent splice bar, the big or small shape of through-hole and the big or small shape adaptation of air-out passageway 501, the position one-to-one of each through-hole and each ventilation passageway. One end of the fixing seat can be sleeved with one end of the casing 510 fixed on the frame 500, a threaded hole can be formed in the position of the fixing seat corresponding to the mounting hole 531, a screw sequentially penetrates through the mounting hole 531 and the threaded hole, the fixing seat is fixedly connected with the frame 500, and therefore assembly between the frame 500 and the motor 310 is achieved. The stator assembly 311 may also be a split structure, and a plurality of parts are spliced into a whole by using a splicing structure.

As shown in fig. 2, the outer peripheral wall of the housing is provided with a plurality of connection posts 315 at intervals, the connection posts 315 extend along the axis of the fixing base and are connected to the circuit board 320, and the circuit board 320 and the connection posts 315 can be fixed by screws.

As shown in fig. 2 and 8, one end of the fan housing 100 close to the air outlet 102 is sleeved and fastened with the housing 510 of the frame 500, one end of the inner surface of the fan housing 100 close to the air outlet 102 may be recessed to form an annular slot, the housing 510 of the frame 500 is cylindrical, an annular step is disposed on the periphery of one end of the housing 510, the annular step enables the housing 510 to form an annular insertion portion 511, the insertion portion 511 is adapted to be inserted and fastened in the annular slot of the fan housing 100, and the frame 500 is fastened and assembled with the fan housing 100 through the engagement between the insertion portion 511 and the annular slot.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An air supply device, characterized in that: the method comprises the following steps:

the movable impeller is arranged in the fan cover and close to the air inlet;

the diffuser is fixed in the fan cover and close to the air outlet, and comprises a diffuser base and a plurality of static blades which are annularly arranged on the peripheral wall of the diffuser base at intervals, the inlet placing angle of each static blade is set to be 25-60 degrees, and the outlet placing angle of each static blade is set to be 20-90 degrees;

the frame, the frame includes casing and installation department, the casing is the tube-shape and locates the air outlet department of fan housing, the installation department including connect in casing and a plurality of ribs of interval each other, the diffuser cover is located and is supported and lean on in a plurality of on the rib, adjacent two form between the rib air supply arrangement's air-out passageway, each the rib is close to the one end of casing is equipped with the arch of slope respectively, each bellied incline direction is the same, bellied entry placement angle A with there is following relation between the export placement angle beta of stator blade: beta-10 degrees and A is less than or equal to beta +10 degrees.

2. The air supply device according to claim 1, characterized in that: the plane passing through the central axis of the diffuser is a meridian plane, the projection of the head of the stationary blade forms a leading edge line on the meridian plane, a tangent line is formed by a curve obtained by the leading edge line and the projection of the diffuser base along the curve at an intersection point, and the included angle between the tangent line and the central axis of the diffuser is 30-70 degrees.

3. The air supply device according to claim 2, characterized in that: on the meridian plane, the projection of the tail part of the stationary blade forms a tail edge line, the included angle of the tangent line of the intersection point of the curve obtained by the projection of the front edge line and the diffuser base is set to be 70-110 degrees, and the included angle of the tangent line of the intersection point of the curve obtained by the projection of the tail edge line and the diffuser base is set to be 70-110 degrees.

4. The air supply device according to claim 1, characterized in that: the inner surface of the fan cover comprises a first part and a second part, the first part is arranged in an equal diameter mode, the second part is of a diameter-changing structure, and the diameter of the second part is gradually increased from the air inlet to the air outlet.

5. The air supply device according to claim 4, characterized in that: the diffuser base comprises an upper section and a lower section, the upper section is of a reducing structure, the outer diameter of the upper section is gradually increased from the air inlet to the air outlet, the outer surface of the lower section is of an equal-diameter structure, and the position of the lower section corresponds to the position of the first part.

6. The air supply device according to claim 5, characterized in that: the second part comprises a first cambered surface and a second cambered surface which are connected, the first cambered surface is arranged close to the air outlet and is an inwards concave cambered surface, and the second cambered surface is arranged close to the air inlet and is an inwards convex cambered surface; the movable impeller comprises a movable impeller base and a plurality of movable blades arranged on the outer surface of the movable impeller base, the outer surface of the movable impeller base is inwards concave to form an arc surface, the outer diameter of the movable impeller base is gradually increased from the air inlet to the air outlet, the position of the first arc surface corresponds to the position of the upper section, the position of the second arc surface corresponds to the position of the outer surface of the movable impeller base, the curvature of the outer surface of the upper section is smaller than that of the first arc surface, and the curvature of the outer surface of the movable impeller base is larger than that of the second arc surface.

7. The air supply device according to claim 5, characterized in that: an inner convex ring and an outer convex ring are formed on one side, close to the movable impeller, of the upper section in a protruding mode, an annular groove is formed between the inner convex ring and the outer convex ring, and one end, far away from the air inlet, of the movable impeller is accommodated in the annular groove in a matched mode.

8. The air supply device according to claim 4, characterized in that: a gap is formed between the top of each static blade and the inner surface of the fan cover, and the gap at the narrowest part of the top of each static blade and the inner surface of the fan cover is 0.1mm.

9. The air supply device according to any one of claims 1 to 8, characterized in that: the installation department still is including locating bearing room in the casing, the rib connect in the bearing room with between the casing.

10. The air supply device according to claim 9, characterized in that: the driving mechanism comprises a circuit board and a motor electrically connected to the circuit board, a rotating shaft of the motor is connected with the movable impeller, and the circuit board is provided with a lead wire used for being connected with an external power supply.

11. The air supply device according to claim 10, characterized in that: one part of the motor is sleeved at one end, far away from the diffuser, of the rack, the motor is fixedly connected with the ribs, and the circuit board is fixed at one end, far away from the diffuser, of the motor.