CN212389575U - Air supply arrangement and dust catcher - Google Patents

Abstract

The application provides an air supply arrangement and dust catcher, this air supply arrangement includes: a fan cover provided with an air supply outlet; the frame comprises a connecting rib and an air supply cavity communicated with the air supply outlet, and the rotating shaft is sleeved on the frame; the impeller corresponds to the air supply outlet in position and is fixedly connected with one end of the rotating shaft; the diffuser comprises a base, an inner wall cylinder and a plurality of stationary blades; the base is provided with a first surface facing the impeller and a second surface opposite to the first surface, the inner wall cylinder is formed by protruding from the second surface in the direction away from the impeller, and the base and the inner wall cylinder are both connected with the connecting ribs; a plurality of stationary blades are convexly arranged on the first surface at intervals along the circumferential direction; the rack is provided with convex blocks towards the stationary blades, a second flow guide channel is formed between two adjacent convex blocks, and the direction of the second flow guide channel gradually turns to the outer wall surface of the inner wall cylinder in the direction from the impeller to the rack. The application provides an air supply arrangement can reduce the loss that flows, raises the efficiency and reduces power consumption.

Description

Air supply arrangement and dust catcher

Technical Field

The application belongs to the technical field of dust collecting equipment, and particularly relates to an air supply device and a dust collector.

Background

The conventional vacuum cleaner in the market generally comprises a fan housing, an impeller, a rotating shaft, a motor, a frame, a diffuser and other parts. When the fan is in actual use, the motor drives the impeller to rotate, a large vacuum degree can be formed at the inlet of the fan cover, namely the air supply port, air flow is sucked from the air supply port, and after the air flow obtains large kinetic energy through the impeller flow channel, the air flow passes through the diffuser at the rear part of the impeller and flows out through the rack and the motor structure. However, in the existing common vacuum cleaners, especially the handheld vacuum cleaner, because the volume of the air supply device used therein is usually small and the rotation speed is usually high, which is usually between 8 ten thousand rpm and 15 ten thousand rpm, when the air flow passes through the diffuser and the motor at the rear part in the flowing process, the air flow which is not guided directly impacts the frame and the motor, so that the flowing loss is very large, the efficiency of the air supply device is low, and the power consumption is increased.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide an air supply device and a dust collector, so as to solve the technical problems that the air supply device of the dust collector in the prior art has large flow loss, low efficiency and large power consumption caused by direct impact of airflow which is not guided on a rack and a motor.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is an air blowing device including:

the fan cover is provided with an air supply outlet;

the frame comprises a connecting rib and an air supply cavity communicated with the air supply outlet;

the rotating shaft is arranged in the air supply cavity and is sleeved on the rack;

the impeller is arranged in the air supply cavity and corresponds to the position of the air supply outlet, and the impeller is fixedly connected with one end of the rotating shaft, which extends out towards the air supply outlet; and the number of the first and second groups,

the diffuser comprises a base, an inner wall cylinder and a plurality of stationary blades; the base is provided with a first surface facing the impeller and a second surface opposite to the first surface, the inner wall cylinder is formed by protruding from the second surface in the direction away from the impeller, and the base and the inner wall cylinder are both connected with the connecting ribs; a plurality of stationary blades are convexly arranged on the first surface at intervals along the circumferential direction;

the machine frame is provided with convex blocks protruding towards the static blades, a first flow guide channel is formed between two adjacent static blades, a second flow guide channel is formed between two adjacent convex blocks, the first flow guide channel is communicated with the second flow guide channel, and the direction of the second flow guide channel gradually turns to the outer wall surface of the inner wall cylinder in the direction from the impeller to the machine frame.

Optionally, the base is sleeved on a rack, and the rack comprises an inner cylinder, an outer cylinder arranged on the periphery of the inner cylinder and a connecting rib for connecting the inner cylinder and the outer cylinder; the first surface includes a central region connected to the inner barrel and a peripheral region surrounding the central region;

the stationary blades are formed by protruding from the peripheral area towards the direction of the air supply outlet; all stationary blades are gradually towards the slope setting of buckling of circumferential direction on the radial direction along the base, and the direction of rotation of all stationary blades is unanimous.

Alternatively, the stationary blade has a tip end surface facing the air supply port, and the tip end surface abuts against an inner wall surface of the fan cover.

Optionally, two adjacent stationary blades are connected by a connecting bevel, and the connecting bevel is arranged obliquely toward the frame in the opposite direction along the rotation direction of the stationary blade.

Optionally, a zigzag gap is formed between two adjacent stationary vanes on the outer edge of the base.

Optionally, a clearance groove for accommodating the impeller is provided between the inner ring surface of the base and the stationary blade in the middle region.

Optionally, a plurality of limiting clamping grooves are formed in the end face, facing the free end of the rack, of the inner wall cylinder, and the connecting ribs are clamped into the limiting clamping grooves in an adaptive mode.

Optionally, the plurality of connecting ribs are radially arranged outwards from the center of the rack, the bump is located between the outer cylinder and the inner wall cylinder, and the thickness of the bump is gradually reduced from the root connected with the connecting ribs to the head.

Optionally, on a first planar cascade graph formed after a circumferential horizontal section taken at a height middle position of the stationary blade is unfolded, a connecting line of corresponding points of a tail part of the stationary blade, which is far away from the base, is taken as a first forehead line, a line formed by connecting thickness midpoints of the stationary blade is taken as a first center line, and an included angle formed by an extension line of the first center line at the tail part of the stationary blade and a tangent line of the first forehead line at the tail part of the stationary blade is taken as an outlet placing angle β; on a second plane cascade graph formed by unfolding a circumferential vertical section cut at the middle position of the thickness of the bump, taking a connecting line of corresponding points of the bump facing the head of the diffuser as a second forehead line, taking a line formed by connecting the thickness midpoints of the bumps as a second center line, and taking an included angle formed by the extension line of the second center line on the head of the bump and the second forehead line as a bump inlet placing angle A; a ═ β ± 10 °.

The application also provides a dust collector which comprises the air supply device.

The application provides an air supply arrangement and dust catcher's beneficial effect lies in: compared with the prior art, the air supply device and the dust collector of the application form a first flow guide channel with flow guide and diffusion effects between two adjacent static blades by arranging the static blades on the diffuser and arranging the convex blocks on the rack, form a second flow guide channel communicated with the first flow guide channel between two adjacent convex blocks, and gradually turn to the outer wall surface of the inner wall cylinder along the direction from the impeller to the rack, so that after airflow enters the air supply device, the first flow guide channel and the second flow guide channel can sequentially conduct flow guide and diffusion on the airflow, namely, the diffuser and the structure formed by the convex blocks on the rack can diffuse the airflow at the outlet of the impeller, and the effect of the air supply device and the dust collector is better than that of the air supply device and the dust collector when the diffuser and the fan are used independently; therefore, after the gas is fully diffused, the direct impact of the airflow on the motor is effectively reduced, more impact kinetic energy is converted into static pressure, the flow loss is reduced, the efficiency of the air supply device is improved, and the power consumption is reduced. Meanwhile, the diffuser is additionally provided with the inner wall barrel positioned below the base, and the inner wall barrel is connected with the connecting rib of the rack, so that the diffuser provided with the inner wall barrel can better guide airflow, the effect of preventing the airflow from diffusing and flowing towards the inside of the fan is achieved, further reduction of flowing loss is facilitated, efficiency is improved, and power consumption is reduced.

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 cross-sectional view of an air supply device provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a diffuser of an air supply device according to an embodiment of the present disclosure;

FIG. 3 is a first planar vane view of a diffuser provided in accordance with an embodiment of the present application;

fig. 4 is a schematic structural diagram of a frame of an air supply device according to an embodiment of the present invention;

FIG. 5 is a top view of a frame of an air supply apparatus according to an embodiment of the present invention;

fig. 6 is a second planar raster image of bumps on a frame according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Wind shield	200	Rack
300	Rotating shaft	310	Bearing assembly
				400	Impeller	500	Diffuser
110	Air supply outlet	210	Inner cylinder
				220	Outer cylinder	230	Connecting rib
120	Air supply cavity	510	Base seat
				520	Inner wall cylinder	530	Stationary blade
240	Bump	250	Mounting hole
				610	Circuit board	600	Motor
531	End face of the top end	532	Connecting inclined plane
				533	Sawtooth shaped opening	511	Avoiding groove
521	Limiting clamping groove	231	Faying surface
				11	First rear forehead line	12	First central line
13	First forehead line	21	Second forehead line
				22	Second central line	540	Inner ring rib

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present application are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.

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.

It will 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 that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

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.

The embodiment of the application provides an air supply device.

Referring to fig. 1, 2 and 4, in an embodiment, the air blowing device includes a fan housing 100, a frame 200, a rotating shaft 300, an impeller 400 and a diffuser 500. Specifically, an air supply outlet 110 is provided on the fan housing 100; the frame 200 comprises an inner cylinder 210, an outer cylinder 220 and a plurality of connecting ribs 230 for connecting the inner cylinder 210 and the outer cylinder 220, the outer cylinder 220 is matched and spliced with the fan housing 100, and the inner cylinder 210, the outer cylinder 220 and the fan housing 100 enclose to form an air supply cavity 120 communicated with the air supply outlet 110; the rotating shaft 300 is arranged in the air supply cavity 120 and is sleeved in the inner barrel 210; the impeller 400 is arranged in the air supply cavity 120 and corresponds to the air supply outlet 110, and the impeller 400 is fixedly connected with one end of the rotating shaft 300, which extends towards the air supply outlet 110; the diffuser 500 is disposed between the frame 200 and the impeller 400, and the diffuser 500 includes a base 510, an inner wall tube 520, and a plurality of stationary blades 530; the base 510 and the inner wall cylinder 520 are both annular, and the base 510 is sleeved outside the inner cylinder 210; the base 510 has a first surface facing the impeller 400 and a second surface opposite to the first surface, the inner wall cylinder 520 is formed to protrude from the second surface in a direction away from the impeller 400, and both the base 510 and the inner wall cylinder 520 are connected with the connection rib 230; the first surface is provided with a plurality of stationary blades 530 protruding at intervals in the circumferential direction. On the frame 200, a bump 240 protruding toward the diffuser 500 is provided on the connection rib 230, a first flow guiding channel having a flow guiding and diffusing effect is formed between two adjacent stationary blades 530, a second flow guiding channel communicated with the first flow guiding channel is formed between two adjacent bumps 240, and the second flow guiding channel gradually turns to the outer wall surface of the inner wall cylinder 520 in the direction from the impeller 400 to the frame 200.

Based on the structural design, in the embodiment, the diffuser 500 is provided with the stationary blades 530 and the rack 200 is provided with the bumps 240, so that a first flow guide channel with a flow guide and pressure expansion effect is formed between two adjacent stationary blades 530, a second flow guide channel communicated with the first flow guide channel is formed between two adjacent bumps 240, and the second flow guide channel gradually turns to the outer wall surface of the inner wall cylinder 520 in the direction from the impeller 400 to the rack 200, so that after the airflow enters the air supply device, the first flow guide channel and the second flow guide channel can sequentially conduct flow guide and pressure expansion on the airflow, that is, the diffuser 500 and the rack 200 can effectively expand the airflow at the outlet of the impeller 400, and the effect is better than that when the two are used independently; therefore, after the gas is fully diffused, the direct impact of the airflow on the motor 600 is effectively reduced, more impact kinetic energy is converted into static pressure, the flow loss is reduced, the efficiency of the air supply device is improved, and the power consumption is reduced. Meanwhile, the diffuser 500 is additionally provided with the inner wall tube 520 positioned below the base 510, and the inner wall tube 520 is connected with the connecting rib 230 of the rack 200, so that the diffuser 500 provided with the inner wall tube 520 can better guide the air flow, and plays a role in preventing the air flow from diffusing and flowing to the inside of the fan, thereby being beneficial to further reducing the flow loss, improving the efficiency and reducing the power consumption.

Particularly, the air supply device is mainly suitable for a dust collector product, in particular to a handheld dust collector. As shown in tables 1 and 2 below, table 1 shows the air data test results of the conventional vacuum cleaner, and table 2 shows the air data test results of the improved vacuum cleaner of the present application. The motor of the vacuum cleaner shown in table 1 is the same as the motor shown in table 2, but the conventional blower device, i.e., the diffuser, which is a common diffuser including only the base and the plurality of stationary blades, is provided in the vacuum cleaner shown in table 1 in cooperation with the motor, and the improved blower device of the present application is provided in the vacuum cleaner shown in table 2 in cooperation with the motor. As can be seen from the comparison of the data in tables 1 and 2, the vacuum degree, the corrected vacuum degree, the suction power, the efficiency, and the like of the air blowing device according to the present invention are increased by applying the air blowing device under the same aperture, voltage, and the like.

TABLE 1 dust collector (Motor) air data test (before improvement)

TABLE 2 dust collector (motor) air data test (after improvement)

It should be noted that, in the present application, the direction from the rack 200 to the fan housing 100 is a direction from bottom to top, the air blowing device further includes a motor 600 mounted at the lower end of the rotating shaft 300, and a circuit board 610 located below the motor 600, the circuit board 610 has a lead connected to an external power source, and the circuit board 610 is electrically connected to the motor 600 to realize automatic control of the motor 600. In addition, the rotating shaft 300 is further provided with a bearing 310, and the bearing 310 is in limited sleeve connection with the inner cylinder 210. As shown in FIG. 5, the rack 200 is further provided with a plurality of mounting holes 250 for fixing the motor 600, and the mounting holes 250 are provided on the connecting ribs 230 at a side adjacent to the outer cylinder 220 of the rack 200.

Referring to fig. 1 and 2, in the present embodiment, the first surface includes a middle region connected to the inner cylinder 210 and a peripheral region surrounding the middle region; the stationary blades 530 are formed to protrude from the peripheral region in a direction toward the air blowing port 110; all the stationary blades 530 are arranged to be gradually bent and inclined in the circumferential direction in the radial direction of the base 510, and the rotation directions of all the stationary blades 530 are uniform. In the radial direction along the base 510, the outlet air passage between two adjacent stationary blades 530 is arranged in a gradually expanding manner, so as to further increase the diffusion effect of the diffuser 500. The first surface is inclined downwards along the radial outward direction to achieve better effect of guiding the airflow downwards; meanwhile, the second surface is a horizontal surface, and preferably, the stationary blades 530 and the inner wall cylinder 520 are perpendicular to the second surface, so as to obtain a better backflow effect and facilitate mold opening manufacturing. In the present embodiment, the plurality of stationary blades 530 are preferably arranged at uniform intervals along the circumferential direction to obtain a more uniform flow guiding and pressure expanding effect, but in other embodiments, the plurality of static pressure blades may also be non-uniformly distributed; similarly, the plurality of connecting ribs 230 are preferably symmetrically distributed, and may also be asymmetrically distributed.

Further, as shown in fig. 1, in the present embodiment, the stationary blade 530 has a tip end surface 531 facing the air blowing port 110, and the tip end surface 531 is in contact with the inner wall surface of the fan cover 100. Thus, when the top end of the stationary blade 530 is disposed in a plane, it may be conveniently assembled with the fan housing 100, and after the top end surface 531 of the stationary blade 530 abuts against the inner wall surface of the fan housing 100, the top end of the stationary blade 530 may be completely contacted with the fan housing 100, which is not only beneficial to preventing the airflow from flowing out from the gap therebetween, but also may make the diffuser 500 be more stably installed by the upper and lower clamping actions of the fan housing 100 and the frame 200.

Referring to fig. 2, in the present embodiment, two adjacent stationary blades 530 are connected by a connection inclined surface 532, and the connection inclined surface 532 is inclined toward the frame 200 in a direction opposite to a rotation direction of the stationary blade 530. It can be understood that the design of the connection inclined plane 532 can effectively increase the area of the air outlet channel formed between two adjacent stationary blades 530, so as to further enhance the diffusion effect. In addition, as can be seen from fig. 2, after the plurality of stationary blades 530 are arranged at intervals along the circumferential direction of the base 510, a zigzag gap 533 is formed between two adjacent stationary blades 530 on the outer edge of the base 510, and the zigzag gap also has a certain flow guiding and pressure expanding effect.

Referring to fig. 1 and 2, in the present embodiment, a clearance groove 511 for accommodating the impeller 400 is formed between the inner ring surface of the base 510 and the stationary blade 530 on the middle region. In other embodiments, the impeller 400 may also be directly disposed above the diffuser 500, but in this embodiment, by disposing the avoiding groove 511, a partial area of the impeller 400 may be accommodated in the avoiding groove 511, which is further beneficial to reducing the overall volume of the blowing device. Of course, there should be a gap between the impeller 400 and the groove surface of the relief groove 511 to avoid interference with the rotation of the impeller 400 and abrasion of the impeller 400 to the diffuser 500.

Further, as shown in fig. 1 and 2, in this embodiment, a plurality of limiting slots 521 are disposed on the end surface of the inner wall cylinder 520 facing the free end of the frame 200, and the connecting rib 230 is inserted into the limiting slots 521 in an adaptive manner, so that the diffuser plate is more fixed and stable in position, and the situation that the flow guiding diffuser effect is reduced due to the movement of the diffuser 500 can be avoided. Specifically, the connecting rib 230 is inclined downward in the radial direction, a bridging surface 231 adjacent to the outer wall surface of the inner cylinder 210 is disposed near the inner cylinder 210, an inner ring rib 540 is formed by extending downward the edge of the inner ring surface of the base 510 of the diffuser 500, the lower end surface of the inner ring rib 540 is bridged on the bridging surface 231 of the connecting rib 230, and the other side of the connecting rib 230 is clamped in the limit clamping groove 521.

Referring to fig. 4 to 6, in the present embodiment, the plurality of connection ribs 230 are radially disposed outward from the center of the frame 200, the protrusion 240 is located between the outer tube 220 of the frame 200 and the inner wall tube 520 of the diffuser 500, and the thickness of the protrusion 240 is gradually reduced from the root connected to the connection ribs 230 to the head, so that the flow guiding performance of the protrusion 240 can be further improved by the streamline configuration that the protrusion is gradually reduced in the direction opposite to the airflow direction, and of course, in other embodiments, the thickness of the protrusion 240 may be equal from the root to the head, but the flow guiding performance is reduced. In addition, for making the head of lug 240 more press close to streamlined to make the air current through lug 240 head department flow more smoothly, and then lug 240's water conservancy diversion effect is better, in this application, lug 240's head terminal surface is the fillet setting.

Referring to fig. 2 and 3, in the present embodiment, on a first planar cascade diagram formed after a circumferential horizontal section taken at a height middle position of the stationary blade 530 is developed, a connecting line of corresponding points of the aft portion of the stationary blade 530 facing away from the base 510 is a first forehead line 11, a line connected by a thickness midpoint of the stationary blade 530 is a first center line 12, and an angle between an extension line of the first center line 12 at the aft portion of the stationary blade 530 and a tangent line of the first forehead line 11 at the aft portion of the stationary blade 530 is an outlet placement angle β. Of course, the stationary blades 530 further have an inlet placement angle α, and on the first planar cascade diagram, a connecting line of the stationary blades 530 towards a corresponding point of the head of the base 510 is a first forehead line 13, and an included angle between a tangent of the first midline 12 at the head of the stationary blades 530 and a tangent of the first forehead line 13 at the head of the stationary blades 530 is the inlet placement angle α. In the present embodiment, for better flow guiding effect, a is preferably in the range of 25 ° to 60 °, and β is preferably in the range of 20 ° to 90 °.

Referring to fig. 4 and 6 together, in the present embodiment, on the second planar cascade diagram formed after the circumferential vertical section taken at the middle position of the thickness of the bump 240 is unfolded, the connecting line of the corresponding point of the bump 240 facing the head of the diffuser 500 is the second forehead line 21, the line connected by the midpoint of the thickness of the bump 240 is the second middle line 22, the angle between the extension line of the second middle line 22 at the head of the bump 240 and the second forehead line 21 is the inlet installation angle a of the bump 240, and a is β ± 10 °. It can be appreciated that within this preferred angle range, the protrusions 240 on the frame 200 can better match the angle of the airflow thrown from the impeller 400, thereby further reducing the airflow impact, improving the air supply efficiency, and reducing the energy consumption.

The application also provides a dust collector which comprises an air supply device, the specific structure of the air supply device refers to the above embodiments, and the dust collector adopts all the technical schemes of all the above embodiments, so that all the beneficial effects brought by the technical schemes of the above embodiments are also achieved, and the details are not repeated herein.

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 (10)

1. An air supply device, comprising:

the fan cover is provided with an air supply outlet;

the frame comprises a connecting rib and an air supply cavity communicated with the air supply outlet;

the rotating shaft is arranged in the air supply cavity and is sleeved on the rack;

the impeller is arranged in the air supply cavity and corresponds to the air supply outlet in position, and the impeller is fixedly connected with one end, extending out towards the air supply outlet, of the rotating shaft; and the number of the first and second groups,

a diffuser including a base, an inner wall tube, and a plurality of stationary blades; the base is provided with a first surface facing the impeller and a second surface opposite to the first surface, the inner wall cylinder is formed by protruding from the second surface in a direction away from the impeller, and the base and the inner wall cylinder are connected with the connecting ribs; a plurality of stationary blades are convexly arranged on the first surface at intervals along the circumferential direction;

the impeller comprises a rack, and is characterized in that convex lugs facing the fixed blades are arranged on the rack, a first flow guide channel is formed between the fixed blades which are adjacent to each other, a second flow guide channel is formed between the convex lugs which are adjacent to each other, the first flow guide channel is communicated with the second flow guide channel, and the direction of the second flow guide channel gradually turns to the outer wall surface of the inner wall cylinder along the direction from the impeller to the rack.

2. The blowing apparatus according to claim 1, wherein the base is coupled to the frame, and the frame includes an inner cylinder, an outer cylinder disposed at an outer periphery of the inner cylinder, and the connecting rib connecting the inner cylinder and the outer cylinder; the first surface includes a central region connected to the inner barrel and a peripheral region surrounding the central region;

the fixed blades are formed by protruding from the peripheral area towards the direction of the air supply outlet; all the stator blades are arranged along the radial direction of the base and gradually bend and incline towards the circumferential direction, and the rotating directions of the stator blades are consistent.

3. The blower device according to claim 2, wherein the stationary blade has a tip end surface facing the air blowing port, and the tip end surface abuts against an inner wall surface of the fan cover.

4. The blower apparatus as claimed in claim 2, wherein two adjacent stationary blades are connected to each other by a connecting ramp, and the connecting ramp is inclined toward the frame in a direction opposite to a direction of rotation of the stationary blades.

5. The blowing apparatus as claimed in claim 2, wherein a zigzag gap is formed between two adjacent stationary blades on an outer edge of said base.

6. The blowing apparatus as claimed in claim 2, wherein a clearance groove for receiving the impeller is provided between the inner circumferential surface of the base and the stationary blade in the middle region.

7. The air supply device as claimed in claim 1, wherein a plurality of limiting clamping grooves are arranged on the end face of the free end of the inner wall cylinder facing the rack, and the connecting ribs are clamped into the limiting clamping grooves in an adaptive mode.

8. The blowing apparatus as claimed in claim 2, wherein a plurality of said ribs are arranged radially outward from a center of said frame, said projection is located between said outer cylinder and said inner wall cylinder, and a thickness of said projection is gradually reduced from a root portion connected to said ribs to a head portion.

9. The air supply apparatus according to any one of claims 1 to 8, wherein, on a first planar cascade diagram formed by developing a circumferential horizontal section taken at a heightwise intermediate position of the stationary blade, a line connecting corresponding points of a tail portion of the stationary blade facing away from the base is a first forehead line, a line connecting midpoints of thicknesses of the stationary blade is a first center line, and an angle between an extension line of the first center line at the tail portion of the stationary blade and a tangent line of the first forehead line at the tail portion of the stationary blade is an outlet placement angle β; on a second plane cascade graph formed by unfolding a circumferential vertical section taken at the middle position of the thickness of the bump, taking a connecting line of corresponding points of the bump facing the head of the diffuser as a second forehead line, taking a line formed by connecting thickness midpoints of the bumps as a second midline, and taking an included angle between an extension line of the head of the bump and the second forehead line as a bump inlet placing angle A; a ═ β ± 10 °.

10. A vacuum cleaner comprising an air supply apparatus as claimed in any one of claims 1 to 9.

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