An air supply device and a vacuum cleaner

Abstract

The application provides an air supply device and a dust collector, the air supply device comprising: a fan cover provided with an air supply port; a frame comprising a connecting rib and an air supply cavity communicated with the air supply port, a rotating shaft sleeve connected to the frame; an impeller corresponding to the air supply port and fixedly connected to one end of the rotating shaft; a diffuser comprising a base, an inner wall cylinder and a plurality of stationary vanes; the base having a first surface facing the impeller and a second surface opposite to the first surface, the inner wall cylinder protruding from the second surface in a direction away from the impeller, the base and the inner wall cylinder both connected to the connecting rib; a plurality of stationary vanes protruding from the first surface in a circumferential direction; the frame provided with protrusions protruding towards the stationary vanes, a second flow guide channel formed between two adjacent protrusions, and the second flow guide channel gradually turning towards the outer wall surface of the inner wall cylinder in a direction from the impeller to the frame. The air supply device provided by the application can reduce flow loss, improve efficiency and reduce power consumption.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dust collection equipment, and more particularly to a kind of air supply device and dust collector. BACKGROUND

[0002] The common dust collector on the market usually includes a wind cover, an impeller, a rotating shaft, a motor, a rack and a diffuser. In actual use, the motor drives the impeller to rotate, and a large vacuum degree is formed at the inlet of the wind cover, i.e. the air supply port. The airflow is sucked from the air supply port, obtains a large kinetic energy through the impeller flow channel, and then flows out through the diffuser at the rear of the impeller, the rack and the motor structure. However, in the current common dust collector, especially the handheld dust collector, the volume of the air supply device used inside is usually small, and the rotating speed is very high, usually between 80,000-150,000 rpm. Therefore, during the flow process, especially after passing through the rear diffuser and the motor, the airflow without flow guide will directly impact the rack and the motor, resulting in a large flow loss, low efficiency and large power consumption of the air supply device. SUMMARY

[0003] The purpose of the embodiment of the present application is to provide an air supply device and a dust collector to solve the technical problems of the air supply device of the dust collector in the prior art, i.e. the direct impact of the airflow without flow guide on the rack and the motor, resulting in a large flow loss, low efficiency and large power consumption.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide an air supply device, comprising:

[0005] a wind cover provided with an air supply port;

[0006] a rack comprising a connecting rib and an air supply cavity communicating with the air supply port;

[0007] a rotating shaft built in the air supply cavity and sleeved in an inner cylinder;

[0008] an impeller built in the air supply cavity and corresponding to the position of the air supply port, the impeller being fixedly connected to the end of the rotating shaft extending towards the air supply port; and

[0009] a diffuser, the diffuser comprising a base, an inner wall cylinder and a plurality of stationary vanes; the base having a first surface facing the impeller and a second surface opposite to the first surface, the inner wall cylinder being protruded from the second surface in a direction away from the impeller, the base and the inner wall cylinder being connected to the connecting rib; a plurality of stationary vanes being protruded and spaced in the circumferential direction on the first surface;

[0010] The frame is provided with protrusions protruding towards the stationary vanes, a first flow guide channel is formed between two adjacent stationary vanes, a second flow guide channel is formed between two adjacent protrusions, the first flow guide channel communicates with the second flow guide channel, and the second flow guide channel gradually turns towards the outer wall surface of the inner wall cylinder in the direction from the impeller to the frame.

[0011] Optionally, the base is sleeved on the frame, the frame comprises an inner cylinder, an outer cylinder arranged on the outer periphery of the inner cylinder, and connecting ribs connecting the inner cylinder and the outer cylinder; the first surface comprises a middle region connected with the inner cylinder and a peripheral region surrounding the middle region;

[0012] The stationary vanes are formed by protruding from the peripheral region towards the direction of the air outlet; all the stationary vanes are arranged to gradually bend and incline towards the circumferential direction in the radial direction of the base, and the rotational directions of all the stationary vanes are consistent.

[0013] Optionally, the stationary vanes have top end faces facing the air outlet, and the top end faces abut against the inner wall surface of the air scoop.

[0014] Optionally, two adjacent stationary vanes are connected by a connecting inclined surface, and the connecting inclined surface is arranged to incline towards the frame in the direction opposite to the rotational direction of the stationary vanes.

[0015] Optionally, a sawtooth-shaped gap is formed between two adjacent stationary vanes on the outer edge of the base.

[0016] Optionally, a clearance groove for accommodating the impeller is arranged between the inner annular surface of the base and the stationary vanes on the middle region.

[0017] Optionally, a plurality of limiting clamping grooves are arranged on the free end face of the inner wall cylinder facing the frame, and the connecting ribs are adapted to be clamped into the limiting clamping grooves.

[0018] Optionally, the plurality of connecting ribs are arranged radially from the center of the frame, the protrusions are located between the outer cylinder and the inner wall cylinder, and the thickness of the protrusions gradually decreases from the root connected with the connecting ribs to the head.

[0019] Optionally, on a first planar cascade diagram formed by unfolding a circumferential horizontal cross section taken at the middle position of the height of the stationary vane, a connecting line of the corresponding point of the tail of the stationary vane away from the base is a first back camber line, a line connected by the thickness midpoints of the stationary vane is a first middle line, and the included angle between the extension line of the tail of the stationary vane and the tangent of the first back camber line at the tail of the stationary vane is an outlet installation angle β; on a second planar cascade diagram formed by unfolding a circumferential vertical cross section taken at the middle position of the thickness of the protrusion, a connecting line of the corresponding point of the head of the protrusion facing the diffuser is a second front camber line, a line connected by the thickness midpoints of the protrusion is a second middle line, and the included angle between the extension line of the head of the protrusion and the second front camber line is a protrusion inlet installation angle A; A = β ± 10°.

[0020] The application also provides a dust collector comprising the air supply device.

[0021] The air supply device and the dust collector have the advantages that, compared with the prior art, the air supply device and the dust collector are provided with the static blades on the diffuser and the protrusions on the frame to form the first flow guide channel with the flow guide and diffuser effect between two adjacent static blades and the second flow guide channel communicated with the first flow guide channel between two adjacent protrusions, and 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 frame, so that the first flow guide channel and the second flow guide channel can guide and diffuse the airflow in sequence after the airflow enters the air supply device, the structure composed of the protrusions on the diffuser and the frame can diffuse the airflow at the outlet of the impeller, and the effect is better than that when the diffuser and the frame are used alone; in this way, 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. At the same time, the inner wall cylinder is additionally arranged below the base of the diffuser, and the inner wall cylinder is connected with the connecting ribs of the frame, so that the diffuser provided with the inner wall cylinder can better guide the airflow, prevent the airflow from diffusing into the fan, and further reduce the flow loss, improve the efficiency and reduce the power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0023] Figure 1 The cross-sectional view of the air supply device provided by the embodiments of the application;

[0024] Figure 2 The structure schematic view of the diffuser of the air supply device provided by the embodiments of the application;

[0025] Figure 3 The first plane cascade diagram of the diffuser provided by the embodiments of the application;

[0026] Figure 4 The structure schematic view of the frame of the air supply device provided by the embodiments of the application;

[0027] Figure 5 The top view of the frame of the air supply device provided by the embodiments of the application;

[0028] Figure 6 is a second planar cascade drawing of the rack bump provided by the embodiment of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] Reference Name Reference Name 100 Fan cover 200 Frame 300 Rotating shaft 310 Bearing 400 Impeller 500 Diffuser 110 Air supply port 210 Inner cylinder 220 Outer cylinder 230 Connecting rib 120 Air supply cavity 510 Base 520 Inner wall cylinder 530 Stator blade 240 Lug 250 Mounting hole 610 Circuit board 600 Motor 531 Top end face 532 Connecting inclined surface 533 Sawtooth-shaped gap 511 Avoidance recess 521 Limiting clamping groove 231 Lap joint surface 11 First back forehead line 12 First middle line 13 First forehead line 21 Second forehead line 22 Second middle line 540 Inner ring rib DETAILED DESCRIPTION

[0031] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or 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 indirectly connected to the other element.

[0033] It should also be noted that the left, right, up and down orientation terms in the embodiments of the present application are only relative concepts or are with reference to the normal use state of the product, and should not be considered as limiting.

[0034] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0035] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0036] In addition, the terms "first" and "second" are only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0037] In this application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be construed broadly and do not necessarily mean fixedly connected, but can also mean detachably connected, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] The embodiment of the present application provides a kind of air supply device.

[0039] Please refer to Figure 1 、 Figure 2 And Figure 4 In an embodiment, the air supply device includes a fan cover 100, a frame 200, a rotating shaft 300, an impeller 400 and a diffuser 500. Specifically, the fan cover 100 is provided with an air supply port 110; the frame 200 includes an inner cylinder 210, an outer cylinder 220 and a plurality of connecting ribs 230 connecting the inner cylinder 210 and the outer cylinder 220, the outer cylinder 220 is adaptively spliced with the fan cover 100, the inner cylinder 210, the outer cylinder 220 and the fan cover 100 form an air supply cavity 120 in communication with the air supply port 110; the rotating shaft 300 is built-in in the air supply cavity 120 and is sleeved in the inner cylinder 210; the impeller 400 is built-in in the air supply cavity 120 and is in position correspondence with the air supply port 110, the impeller 400 is fixedly connected with the end of the rotating shaft 300 extending towards the air supply port 110; the diffuser 500 is arranged between the frame 200 and the impeller 400, the diffuser 500 includes a base 510, an inner wall cylinder 520 and a plurality of stationary vanes 530; the base 510 and the inner wall cylinder 520 are annular, 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 protruded from the second surface to the direction away from the impeller 400, the base 510 and the inner wall cylinder 520 are connected with the connecting ribs 230; a plurality of stationary vanes 530 are protruded on the first surface in a circumferential direction. Among them, on the frame 200, specifically on the connecting ribs 230, protruding blocks 240 are provided towards the diffuser 500, a first flow guide channel with flow guiding and diffusing effect is formed between two adjacent stationary vanes 530, a second flow guide channel in communication with the first flow guide channel is formed between two adjacent protruding blocks 240, in the direction from the impeller 400 to the frame 200, the second flow guide channel is gradually turned to the outer wall surface of the inner wall cylinder 520.

[0040] Based on the structure design, in the embodiment, the static blades 530 are arranged on the diffuser 500, and the protrusions 240 are arranged on the frame 200, so as to form the first flow guide channel with flow guide and diffusing effect between two adjacent static blades 530, and form the second flow guide channel communicated with the first flow guide channel between two adjacent protrusions 240, and in the direction from the impeller 400 to the frame 200, the second flow guide channel gradually turns to the outer wall surface of the inner wall cylinder 520. In this way, after the gas flow enters the air supply device, the first flow guide channel and the second flow guide channel can guide and diffuse the gas flow in sequence, that is, the structure composed of the protrusions on the diffuser 500 and the frame 200 can effectively diffuse the gas flow at the outlet of the impeller 400, and the effect is better than that when the diffuser 500 and the frame 200 are used alone. In this way, after the gas is fully diffused, the direct impact of the gas flow on the motor 600 is effectively reduced, more impact kinetic energy is converted into static pressure, so as to reduce the flow loss, improve the efficiency of the air supply device, and reduce the power consumption. At the same time, since the inner wall cylinder 520 located below the base 510 is additionally arranged on the diffuser 500, and the inner wall cylinder 520 is connected with the connecting rib 230 of the frame 200, the diffuser 500 provided with the inner wall cylinder 520 can better guide the gas flow, prevent the gas flow from diffusing into the fan, and further reduce the flow loss, improve the efficiency and reduce the power consumption.

[0041] Specifically, the air supply device is mainly applied to a dust collector product, especially a handheld dust collector. As shown in Table 1 and Table 2 below, Table 1 is the air data test result of the existing dust collector, and Table 2 is the air data test result of the improved dust collector of the present application. The motor of the dust collector in Table 1 is the same as the motor in Table 2, but the existing air supply device is matched with the motor in the dust collector in Table 1, that is, the diffuser is a common diffuser including only a base and a plurality of static blades, and the improved air supply device of the present application is matched with the motor in the dust collector in Table 2. According to the comparison of the related data in Table 1 and Table 2, under the same aperture, voltage and other conditions, the vacuum degree, corrected vacuum degree, suction power and efficiency of the air supply device of the present application are increased.

[0042] Table 1 Dust collector (motor) air data test (before improvement)

[0043]

[0044] Table 2 Dust collector (motor) air data test (after improvement)

[0045]

[0046] It should be noted that, in the present application, the direction from the rack 200 to the hood 100 is from bottom to top, the air supply device further comprises 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 also provided with a bearing 310, which is sleeved with the inner cylinder 210. Figure 5 As shown in the drawings, the rack 200 is also provided with a plurality of mounting holes 250 for fixing the motor 600, and the mounting holes 250 are arranged on the connecting ribs 230 adjacent to one side of the outer cylinder 220 of the rack 200.

[0047] Please refer to Figure 1 and Figure 2 , in particular, 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 vanes 530 are protruded from the peripheral region towards the direction of the air outlet 110; all the stationary vanes 530 are arranged in a gradually bent and inclined manner in the radial direction of the base 510 towards the circumferential direction, and the rotation directions of all the stationary vanes 530 are consistent. In the radial direction of the base 510, the air outlet channels between two adjacent stationary vanes 530 are arranged in a gradually expanding flared manner to further increase the diffuser effect of the diffuser 500. The first surface is inclined downward in the radial outward direction to achieve better downward air flow guiding effect; at the same time, the second surface is a horizontal surface, and preferably the stationary vanes 530 and the inner wall cylinder 520 are perpendicular to the second surface to obtain better backflow effect and facilitate mold manufacturing. In the present embodiment, the plurality of stationary vanes 530 are preferably uniformly spaced in the circumferential direction to obtain a more uniform flow guiding and diffusing effect, of course, in other embodiments, the plurality of stationary vanes can also be unevenly distributed; similarly, the plurality of connecting ribs 230 are preferably symmetrically distributed, and can also be asymmetrically distributed.

[0048] Further, as shown in the drawings, Figure 1 In the present embodiment, the stationary vane 530 has a top end face 531 facing the air outlet 110, and the top end face 531 abuts against the inner wall face of the hood 100. In this way, when the top end of the stationary vane 530 is arranged as a plane, it can be conveniently assembled with the hood 100, and after the top end face 531 of the stationary vane 530 abuts against the inner wall face of the hood 100, the top end of the stationary vane 530 can be completely in contact with the hood 100, which not only helps to prevent air flow from the gap between them, but also through the clamping action of the hood 100 and the rack 200, the installation of the diffuser 500 is more stable.

[0049] Referring to Figure 2In the embodiment, the two adjacent stationary vanes 530 are connected by a connecting slope 532, and the connecting slope 532 is arranged to be inclined towards the rack 200 in the direction opposite to the rotation direction of the stationary vanes 530. It can be understood that the design of the connecting slope 532 can effectively increase the area of the air outlet channel formed between the two adjacent stationary vanes 530, so as to further enhance the diffuser effect. In addition, the connecting slope 532 can also guide the air flow. Figure 2 As can be seen, after the plurality of stationary vanes 530 are arranged at intervals in the circumferential direction of the base 510, a sawtooth-shaped gap 533 is formed between the two adjacent stationary vanes 530 on the outer edge of the base 510, and the sawtooth-shaped gap also has a certain flow guiding and diffusing effect.

[0050] Please refer to Figure 1 and Figure 2 In the embodiment, the avoidance recess 511 for accommodating the impeller 400 is arranged between the inner annular surface of the base 510 and the stationary vanes 530 in the middle region. In other embodiments, the impeller 400 can also be directly arranged above the diffuser 500, but in the embodiment, part of the impeller 400 can be accommodated in the avoidance recess 511 by arranging the avoidance recess 511, thereby facilitating the reduction of the overall volume of the air supply device. Of course, there should be a gap between the impeller 400 and the groove surface of the avoidance recess 511 to avoid interference with the rotation of the impeller 400 and abrasion of the diffuser 500 by the impeller 400.

[0051] Further, as shown in Figure 1 and Figure 2 In the embodiment, the free end surface of the inner wall cylinder 520 towards the rack 200 is provided with a plurality of limiting clamping grooves 521, and the connecting rib 230 is adapted to be clamped into the limiting clamping grooves 521, so that the position of the diffuser plate is more fixed and stable, and the situation that the flow guiding and diffusing effect is reduced due to the movement of the diffuser 500 can be avoided. Specifically, the connecting rib 230 is arranged to be inclined downward along the radial direction, and has a lap surface 231 adjacent to the outer wall surface of the inner cylinder 210 near the inner cylinder 210. The inner annular surface edge of the base 510 of the diffuser 500 extends downward to form an inner annular rib 540, and the lower end surface of the inner annular rib 540 is lapped on the lap surface 231 of the connecting rib 230, and the other side of the connecting rib 230 is clamped in the limiting clamping groove 521.

[0052] Please refer to Figure 4 to Figure 6In the embodiment, the plurality of connecting ribs 230 are arranged radially outward from the center of the frame 200, the protrusions 240 are located between the outer cylinder 220 of the frame 200 and the inner wall cylinder 520 of the diffuser 500, and the thickness of the protrusions 240 is tapered from the root connected with the connecting ribs 230 to the head. In this way, the tapered streamline arrangement in the direction opposite to the flow direction of the air flow can further improve the flow guiding performance of the protrusions 240. Of course, in other embodiments, the thickness of the protrusions 240 can be equal from the root to the head, but the flow guiding performance will be reduced. In addition, in order to make the head of the protrusion 240 more streamlined, so that the air flow passing through the head of the protrusion 240 flows more smoothly, and the flow guiding effect of the protrusion 240 is better, in the present application, the head end surface of the protrusion 240 is arranged with a rounded corner.

[0053] Please refer to Figure 2 and Figure 3 In the embodiment, on a first planar cascade diagram formed by unfolding a circumferential horizontal cross section taken at the middle height of the stationary blade 530, a connecting line of corresponding points of the tail of the stationary blade 530 away from the base 510 is a first back camber line 11, a line connected by the thickness midpoints of the stationary blade 530 is a first middle line 12, and an included angle between the extension line of the tail of the stationary blade 530 and the tangent of the first back camber line 11 at the tail of the stationary blade 530 is an outlet installation angle β. Of course, the stationary blade 530 also has an inlet installation angle α, on the first planar cascade diagram, a connecting line of corresponding points of the head of the stationary blade 530 toward the base 510 is a first front camber line 13, and a tangent included angle between the tangent of the first middle line 12 at the head of the stationary blade 530 and the tangent of the first front camber line 13 at the head of the stationary blade 530 is the inlet installation angle α. In the embodiment, in order to obtain better flow guiding effect, the preferred range of α is between 25° and 60°, and the preferred range of β is between 20° and 90°.

[0054] Please refer to Figure 4 and Figure 6 In the embodiment, on a second planar cascade diagram formed by unfolding a circumferential vertical cross section taken at the middle thickness of the protrusion 240, a connecting line of corresponding points of the head of the protrusion 240 toward the diffuser 500 is a second front camber line 21, a line connected by the thickness midpoints of the protrusion 240 is a second middle line 22, and an included angle between the extension line of the head of the protrusion 240 and the second front camber line 21 is a protrusion 240 inlet installation angle A, A = β ± 10°. It can be understood that within the preferred angle range, the protrusions 240 on the frame 200 can better match the angle of the air flow thrown out from the impeller 400, thereby being beneficial to further reducing air flow impact and improving air supply efficiency and reducing energy consumption.

[0055] The application also provides a dust collector, which comprises a blowing device, and the blowing device is specifically constructed as the above-mentioned embodiments. Since the dust collector adopts all the technical solutions of the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0056] The above only provides the preferred embodiments of the application and is not used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An air supply device, characterized by, The utility model relates to a fan, comprising: a fan cover provided with a blowing port; a frame comprising a connecting rib and a blowing cavity communicating with the blowing port; a rotating shaft built in the blowing cavity and sleeved on the frame; a impeller built in the blowing cavity and corresponding to the blowing port, the impeller being fixedly connected with an end of the rotating shaft extending toward the blowing port; and a diffuser comprising a base, an inner wall cylinder and a plurality of stationary vanes; the base has a first surface facing the impeller and a second surface opposite to the first surface, the first surface being inclined downward in a direction outward in the radial direction, the inner wall cylinder being formed protruding from the second surface in a direction away from the impeller, the base and the inner wall cylinder being connected with the connecting rib; a plurality of stationary vanes are spaced apart and protrude from the first surface in the circumferential direction; wherein the frame is provided with protrusions protruding toward the stationary vanes, a first flow guide channel is formed between two adjacent stationary vanes, a second flow guide channel is formed between two adjacent protrusions, the first flow guide channel communicates with the second flow guide channel, and in the direction from the impeller to the frame, the second flow guide channel gradually turns to the outer wall surface of the inner wall cylinder.

2. The air supply device according to claim 1, wherein The base is sleeved on the frame, the frame comprises an inner cylinder, an outer cylinder arranged on the outer periphery of the inner cylinder and the connecting rib connecting the inner cylinder and the outer cylinder; the first surface comprises a middle region connected with the inner cylinder and a peripheral region surrounding the middle region; The stationary vanes are formed protruding from the peripheral region in a direction toward the blowing port; all the stationary vanes are arranged in a gradually bending and inclined manner in the radial direction of the base toward the circumferential direction, and the rotational directions of all the stationary vanes are consistent.

3. The air supply device according to claim 2, wherein The stationary vanes have top end faces facing the blowing port, and the top end faces abut against the inner wall surface of the fan cover.

4. The air supply device according to claim 2, wherein Two adjacent stationary vanes are connected by a connecting slope, and the connecting slope is arranged in an inclined manner in a direction opposite to the rotational direction of the stationary vanes toward the frame.

5. The air supply device according to claim 2, wherein On the outer edge of the base, a sawtooth-shaped gap is formed between two adjacent stationary vanes.

6. The air supply device according to claim 2, wherein On the middle region, between the inner annular surface of the base and the stationary vanes, a clearance groove is arranged to accommodate the impeller.

7. The air supply device according to claim 1, wherein A plurality of limiting grooves are arranged on the free end surface of the inner wall cylinder facing the frame, and the connecting rib is adapted to be clamped into the limiting grooves.

8. The air supply device according to claim 2, wherein A plurality of connecting ribs are arranged in a radial manner from the center of the frame, the protrusions are located between the outer cylinder and the inner wall cylinder, and the thickness of the protrusions is gradually reduced from the root connected with the connecting rib to the head.

9. The air supply device according to any one of claims 1 to 8, wherein In a first planar cascade diagram formed by unfolding a circumferential horizontal section taken at a middle position of the height of the stator blade, a connecting line of corresponding points of a tail of the stator blade away from the base is a first back camber line, a line connected by a thickness midpoint of the stator blade is a first middle line, and an included angle between an extension line of the tail of the stator blade and a tangent of the first back camber line at the tail of the stator blade is an outlet setting angle β; in a second planar cascade diagram formed by unfolding a circumferential vertical section taken at a middle position of the thickness of the protrusion, a connecting line of corresponding points of a head of the protrusion toward the diffuser is a second front camber line, a line connected by a thickness midpoint of the protrusion is a second middle line, and an included angle between an extension line of the head of the protrusion and the second front camber line is a protrusion inlet setting angle A; A = β ± 10°.

10. A vacuum cleaner comprising: The air supply device according to any one of claims 1 to 9.

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