CN113074127B

CN113074127B - Air supply device and dust collector

Info

Publication number: CN113074127B
Application number: CN202010011560.2A
Authority: CN
Inventors: 蒋婷婷; 冯国平
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2023-02-03
Anticipated expiration: 2040-01-06
Also published as: CN113074127A

Abstract

The application provides an air supply device and a dust collector. The air supply device comprises a casing, an impeller, a rotating shaft, a motor and a fan cover, wherein the impeller comprises a rear cover plate and a plurality of moving blades arranged on the rear cover plate, a flow guide air passage is formed between the inner surface of the fan cover and the radial outer side of the impeller, and an annular air passage communicated with the flow guide air passage is arranged in the casing; each moving blade is provided with an inner edge close to the central axis of the rear cover plate and an outer edge radially far away from the central axis of the rear cover plate, the outer edge of each moving blade is outwards protruded and extended, and each outer edge is protruded out of the rear cover plate. The application provides an air supply arrangement, the outside protrusion extension setting of outer fringe with each moving blade to with the outer fringe protrusion back shroud of each moving blade, thereby the air current when flowing out the impeller edge, can be driven the certain angle of blade outer fringe drive backward, reduce the air current corner change, reduce the direct impact of air current to the fan housing internal surface, reduce the air current and interfere the district energy loss at the sound between impeller and wind channel, and lifting efficiency, noise reduction.

Description

Air supply device and dust collector

Technical Field

The application belongs to the field of fans, and particularly relates to an air supply device and a dust collector using the same.

Background

The existing fans used by equipment such as a handheld dust collector and the like have the characteristics of small volume and high rotating speed, generally between 6 ten thousand rpm and 15 ten thousand rpm. The motor of the fans drives the impeller to rotate, the airflow is sucked from the inlet of the fan cover, obtains larger kinetic energy through the impeller, flows out from the edge of the impeller along the radial direction of the impeller, and is guided and guided by the fan cover, so that the airflow is converted from the radial direction to the axial direction to flow into the air duct of the shell for diffusion. However, when air flows through the impeller and enters the air duct in the casing, the change of the rotation angle is large, so that the energy loss of the air flow in a dynamic and static interference area between the impeller and the air duct is very large, and simultaneously, large fluid noise is generated, so that the air supply efficiency is low.

Disclosure of Invention

An object of the embodiment of the application is to provide an air supply device to solve the problem that the air supply efficiency is low and the noise is large due to the energy loss of a dynamic and static interference area in a fan in the prior art.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: an air supply device is provided, which comprises a casing, an impeller arranged on the front side of the casing, a rotating shaft driving the impeller to rotate, a motor driving the rotating shaft to rotate and a fan cover covering the impeller, wherein the fan cover is connected with the casing, the motor is arranged in the casing, the impeller comprises a rear cover plate arranged on the rotating shaft and a plurality of moving blades arranged on the rear cover plate, an air inlet is arranged on the front side of the fan cover, a flow guide air passage is formed between the inner surface of the fan cover and the radial outer side of the impeller, and an annular air passage communicated with the flow guide air passage is arranged in the casing; each moving blade is provided with an inner edge close to the central axis of the rear cover plate and an outer edge radially far away from the central axis of the rear cover plate, the outer edge of each moving blade is outwards projected and extended, and each outer edge is projected out of the rear cover plate.

In one embodiment, a distance from a front end of an outer edge of each of the moving blades to the central axis of the back shroud is greater than a distance from a rear end of the outer edge to the central axis of the back shroud.

In one embodiment, a middle portion of an outer edge of each of the moving blades is convexly extended toward the rear side.

In one embodiment, the distance from the outer edge of each moving blade to the central axis of the rear cover plate gradually decreases from front to back.

In one embodiment, an outer edge of each of the moving blades is disposed adjacent a section of the aft cover plate projecting aft of the aft cover plate.

In one embodiment, the projection of the outer edge of each moving blade on the meridian plane of the moving blade is in a multi-segment line shape; or the projection of the outer edge of each moving blade on the meridian plane of the moving blade is in a curve shape; or the projection of the outer edge of each moving blade on the meridian plane of the moving blade is in an arc shape; or the projection of the outer edge of each moving blade on the meridian plane of the moving blade is a multi-section arc, and the multi-section arc comprises a plurality of arc sections which are sequentially and tangentially connected.

In one embodiment, the movable impeller further comprises a front cover plate, the front edge of each movable impeller is connected with the front cover plate, and the middle of the front cover plate is provided with an air inlet.

In one embodiment, the outer diameter of the front cover plate is greater than or equal to the outer diameter of the rear cover plate.

In one embodiment, the outer diameter of the front shroud is greater than the outer diameter of the back shroud, and the distance from each of the outer edges of each of the moving blades to the central axis of the back shroud is less than the radius of the outer contour of the front shroud.

In one embodiment, a hub is convexly arranged in the middle of the rear cover plate and is mounted on the rotating shaft.

In one embodiment, an inner edge of each of the moving blades is spaced from the hub.

In one embodiment, a distance from a front end of an outer edge of each moving blade to a central axis of the rear cover plate is less than half of an inner diameter of the fan housing.

In one embodiment, a diffuser is installed in the casing and comprises a base installed in the casing and a plurality of static blades arranged along the circumferential direction of the base, and the annular air duct is formed between the inner surface of the casing and the base; and a flow channel for guiding airflow is formed between every two adjacent static blades.

In one embodiment, the plurality of stationary blades are sequentially arranged in a plurality of rows along the axial direction of the base, and the number of stationary blades in each row of stationary blades is a plurality, and the plurality of stationary blades in each row of stationary blades is arranged along the circumferential direction of the base.

In one embodiment, in two adjacent rows of stationary blades: the number of the static blades in the next row of static blades is 1.5-4 times of that of the static blades in the previous row of static blades.

Another object of the embodiments of the present application is to provide a vacuum cleaner, which includes the air supply device as described in the above embodiments.

One or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

the air supply arrangement that this application embodiment provided, the outside protrusion of outer fringe with each moving blade extends the setting, and with the outer fringe protrusion back shroud of each moving blade, thereby the air current when flowing out the impeller edge, can be driven the certain angle of blade outer fringe drive backward rotation, reduce the air current corner change, reduce the direct impact of air current to the fan housing internal surface, reduce the air current at the sound interference zone energy loss between impeller and wind channel, and the raising efficiency, the noise reduction.

The dust collector provided by the embodiment of the application uses the air supply device, the air flow loss is small, the power is high, the efficiency is high, and the noise is low.

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 exemplary technical 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 without creative efforts.

Fig. 1 is a schematic cross-sectional structural diagram of an air supply device according to an embodiment of the present application.

Fig. 2 is a schematic sectional structure view of the impeller of fig. 1.

Fig. 3 is a schematic cross-sectional structural diagram of an air supply device according to a second embodiment of the present application.

Fig. 4 is a schematic cross-sectional structural diagram of an impeller in an air supply device according to a third embodiment of the present application.

Fig. 5 is a schematic sectional structural view of the impeller in fig. 4.

Fig. 6 is a schematic cross-sectional structural diagram of an impeller in an air supply device according to a fourth embodiment of the present application.

Fig. 7 is a schematic cross-sectional structural diagram of an impeller in an air supply device provided in the fifth embodiment of the present application.

Fig. 8 is a schematic cross-sectional structural diagram of an impeller in an air supply device according to a sixth embodiment of the present application.

Fig. 9 is a schematic cross-sectional structural view of an impeller in an air blowing device according to a seventh embodiment of the present application.

Fig. 10 is a schematic cross-sectional structural diagram of an impeller in an air supply device according to an eighth embodiment of the present application.

Fig. 11 is a schematic cross-sectional structural diagram of an impeller in an air supply device according to a ninth embodiment of the present application.

Fig. 12 is a schematic structural diagram of a diffuser in an air supply device according to a tenth embodiment of the present application.

Fig. 13 is a schematic cross-sectional structure view of an air supply device according to an eleventh embodiment of the present application.

Fig. 14 is a schematic view of the diffuser of fig. 13.

Fig. 15 is a schematic front view of a diffuser in an air supply device according to a twelfth embodiment of the present disclosure.

Wherein, in the figures, the various reference numbers are given by way of example only:

100-air supply device; 11-a housing; 111-annular air duct; 112-an airway; 12-a rotating shaft; 13-a motor; 14-wind cover; 141-an air inlet; 143-a diversion air passage; 15-a circuit board; 16-a bearing; 20-an impeller; 21-a rear cover plate; 22-moving blades; 221-leading edge; 222-the trailing edge; 223-inner edge; 224-the outer rim; 23-a hub; 24-a front cover plate; 241-air inlet; 30-a diffuser; 31-a base; 33-stationary blades; 330-flow channel.

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 should be noted that the terms "first" and "second" 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. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; 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 the case may be.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

For convenience of description, define: the direction of the airflow inlet of the air supply device is upward, forward or head, and the direction of the airflow outlet of the air supply device is downward, backward or tail.

Referring to fig. 1 and fig. 2, an air supply device 100 according to an embodiment of the present disclosure will now be described. The air supply device 100 comprises a casing 11, an impeller 20, a rotating shaft 12, a motor 13 and a fan housing 14, wherein the impeller 20 is installed at the front side of the casing 11, the impeller 20 is installed on the rotating shaft 12, the rotating shaft 12 is connected with the motor 13, and the motor 13 is installed in the casing 11, so that the motor 13 can drive the rotating shaft 12 to rotate to drive the impeller 20 to rotate. The fan housing 14 is connected to the casing 11, the fan housing 14 covers the impeller 20, and an air inlet 141 is formed at a front side of the fan housing 14, so that when the impeller 20 rotates, air can enter the impeller 20 through the air inlet 141 to be driven by the impeller 20 to flow. In the embodiment of the present application, a flow guiding air passage 143 is formed between the inner surface 142 of the fan housing 14 and the radial outer side of the impeller 20, the casing 11 has an annular air duct 111 therein, and the annular air duct 111 is communicated with the flow guiding air passage 143, so that the airflow flowing out from the impeller 20 is guided by the flow guiding air passage 143 to turn back, and then enters the annular air duct 111 for diffusion. The impeller 20 includes a back cover plate 21 and a plurality of moving blades 22, the moving blades 22 are disposed on the back cover plate 21, the back cover plate 21 is mounted on the rotating shaft 12, so that the rotating shaft 12 drives the back cover plate 21 to rotate, and further drives each moving blade 22 to rotate.

For convenience of description, define: the side of the impeller 20 close to the central axis 210 of the back shroud 21 is inner, and the side of the impeller 20 far from the central axis 210 of the back shroud 21 is outer. Each rotor blade 22 has a leading edge 221, a trailing edge 222, an inner edge 223 and an outer edge 224, wherein the leading edge 221 is the edge of the rotor blade 22 that is far from the back shroud 21, the trailing edge 222 is the edge of the rotor blade 22 that is near the back shroud 21, the height of the rotor blade 22 is the distance of the rotor blade 22 protruding from the back shroud 21, the inner edge 223 is the edge of the rotor blade 22 that is near the central axis 210 of the back shroud 21, and the outer edge 224 is the edge of the rotor blade 22 that is far from the central axis 210 of the back shroud 21. The outer edge 224 of each rotor blade 22 protrudes outward and extends, and each outer edge 224 protrudes out of the rear cover plate 21, so that more outer edges 224 of each rotor blade 22 extend into the guide air passage 143, and when airflow flows to the radial edge of the impeller 20 or just enters the guide air passage 143, the airflow is driven by the outer edge 224 of each rotor blade 22 to rotate backward by a certain angle, and then is guided by the guide air passage 143 to enter the axial annular air duct 111, so that the change of the airflow rotation angle can be reduced, the direct impact of the airflow on the inner surface 142 of the fan housing 14 is reduced, the energy loss of the airflow in the dynamic and static interference area between the impeller 20 and the annular air duct 111 is reduced, the efficiency is improved, and the noise is reduced.

The air supply device 100 of the embodiment of the application extends the outer edge 224 of each moving blade 22 outwards in a protruding manner, and the outer edge 224 of each moving blade 22 protrudes the rear cover plate 21, so that when airflow flows out of the edge of the impeller 20, the airflow is driven by the outer edge 224 of the moving blade 22 to rotate backwards by a certain angle, the change of the rotation angle of the airflow is reduced, the direct impact of the airflow on the inner surface 142 of the fan housing 14 is reduced, the energy loss of the airflow in the dynamic and static interference area between the impeller 20 and the air duct is reduced, the efficiency is improved, and the noise is reduced.

In an embodiment, referring to fig. 1 and fig. 2, a distance from a front end of an outer edge 224 of each moving blade 22 to a central axis 210 of the back shroud 21 is greater than a distance from a back end of the outer edge 224 to the central axis 210 of the back shroud 21, that is, a radially protruding distance from the front end of the outer edge 224 of each moving blade 22 is greater, so that an airflow flowing out of the impeller 20 can be better driven to flow backwards, direct impact of the airflow on an inner surface 142 of the fan housing 14 is reduced, flow loss is reduced, efficiency is improved, and noise is reduced.

In one embodiment, referring to fig. 1 and 2, the middle portion of the outer edge 224 of each rotor blade 22 protrudes towards the rear side, so that the middle portion of the outer edge 224 of each rotor blade 22 is protruded outwards, thereby better guiding the airflow to flow backwards, increasing the backward rotation angle of the airflow, further reducing the direct impact of the airflow on the inner surface 142 of the fan cover 14, reducing the flow loss, improving the efficiency, and reducing the noise.

In one embodiment, referring to fig. 1 and 2, a hub 23 is protruded from a middle portion of the back cover plate 21, the hub 23 is mounted on the rotating shaft 12, and the hub 23 is disposed to facilitate the fixed connection with the rotating shaft 12 and to increase the strength of the impeller 20.

In one embodiment, the back cover plate 21 may be directly fixed to the shaft 12 to reduce the weight of the impeller 20.

In one embodiment, the inner edge 223 of each rotor blade 22 is spaced apart from the hub 23, so that a larger air inlet space is formed at the center of the impeller 20, thereby facilitating air inlet and improving efficiency.

In one embodiment, the inner edge 223 of each rotor blade 22 may be attached to the hub 23 to increase the area of each rotor blade 22, which in turn may increase the drive area.

In one embodiment, the motor 13 is mounted at the rear side of the casing 11, and an annular air duct 112 is formed between the inner surface of the casing 11 and the motor 13 to better guide the airflow, reduce the speed of the airflow, improve the diffuser effect, and also dissipate heat from the motor 13.

In one embodiment, a circuit board 15 is mounted on the rear side of the housing 11, and the motor 13 is connected to the circuit board 15 to drive the motor 13 to operate. In some embodiments, the circuit board 15 may be disposed outside the housing 11, or the motor 13 may be controlled to operate by an external controller.

In one embodiment, the circuit board 15 is fixedly attached to the motor 13 to facilitate control of the motor 13.

In an embodiment, referring to fig. 1 and fig. 2, a distance from a front end of an outer edge 224 of each moving blade 22 to a central axis 210 of the rear cover plate 21 is less than a half of an inner diameter of the fan housing 14, that is, a front end of the outer edge 224 of each moving blade 22 is spaced from an inner surface 142 of the fan housing 14, so that while the outer edge 224 of each moving blade 22 partially drives the airflow to rotate backward, a certain flow guiding air passage 143 is provided between the outer edge 224 of the moving blade 22 and the inner surface 142 of the fan housing 14, so as to guide and redirect the airflow and reduce the flow loss of the airflow.

In an embodiment, referring to fig. 1 and fig. 2, distances from the outer edges 224 of the moving blades 22 to the central axis 210 of the rear cover plate 21 gradually decrease from front to rear, so that areas of the air guide channels 143 between the outer edges 224 of the moving blades 22 and the inner surface 142 of the fan housing 14 gradually increase from front to rear, thereby facilitating better backward flow of the air flow, and when the outer edges 224 of the moving blades 22 drive the air flow to rotate backward, the air flow diffuses and decreases in speed, so as to further reduce impact on the inner surface 142 of the fan housing 14, reduce energy loss, improve efficiency, and reduce noise.

In one embodiment, referring to fig. 1 and fig. 2, a plane passing through the central axis 210 of the back shroud 21 is a meridian plane of the impeller 20, and a meridian projection plane of each moving blade 22 is projected onto the meridian plane along the circumferential direction of the central axis 210. The projection of the outer edge 224 of each rotor blade 22 on the meridian plane of the rotor blade 22 is a marginal line projected onto the meridian plane along the circumferential direction of the central axis 210 by the outer edge 224 of the rotor blade 22, and the marginal line is the outer side of the meridian projection plane of the rotor blade 22.

In an embodiment, referring to fig. 1 and fig. 2, a projection of an outer edge 224 of each moving blade 22 on a meridian plane of the moving blade 22 is curved, that is, an edge line of the outer edge 224 of each moving blade 22 projected on the meridian plane of the moving blade 22 is curved, so that the outer edge 224 of the moving blade 22 can better guide the airflow to flow backwards, reduce the turning angle of the airflow, reduce the flow loss, improve the diffusion effect, and reduce the noise.

In one embodiment, referring to fig. 2, the outer edge 224 of each moving blade 22 is in a convex arch shape in the middle of the edge line projected by the meridian plane of the moving blade 22, so as to better guide the airflow to flow backwards, reduce the airflow rotation angle, reduce the flow loss, improve the diffusion effect, and reduce the noise.

In an embodiment, as in the sixth embodiment, referring to fig. 8, the outer edge 224 of each moving blade 22 is recessed inward in the middle of the edge line projected by the meridian plane of the moving blade 22, so that when the outer edge 224 of the moving blade 22 guides the airflow to rotate backward, the airflow is better diffused, the speed is reduced, and the diffusion effect is improved.

In one embodiment, as shown in the seventh embodiment, referring to fig. 9, the outer edge 224 of each moving blade 22 is disposed near a section of the rear cover plate 21 protruding rearward from the rear cover plate 21, so that the airflow flowing out of the rear cover plate 21 can be better driven by the outer edge 224 of the moving blade 22 to rotate rearward, thereby reducing the airflow loss near the rear cover plate 21.

In one embodiment, referring to FIG. 9, the projection of the outer edge 224 of each rotor blade 22 onto a meridian plane of the rotor blade 22 is curved to facilitate locating where the edges of the rotor blade 22 are formed to also protrude from the aft cover plate 21.

In an embodiment, as in the eighth embodiment, referring to fig. 10, the middle part of the outer edge 224 of each moving blade 22 extends convexly towards the rear side, and an inward recess 2241 is formed between the middle part and the rear part of the outer edge 224 of the moving blade 22, when the middle part and the front part of the outer edge 224 of the moving blade 22 bring the airflow to rotate backwards, the airflow at the recess 2241 can be pushed to flow backwards, that is, the airflow at the rear part of the outer edge 224 of the moving blade 22 is pushed to flow backwards, and the airflow in the impeller 20 flowing to the rear part of the outer edge 224 of the moving blade 22 in the radial direction can be more quickly diffused and decelerated, and the airflow flowing out from the middle part and the front part of the outer edge 224 of the moving blade 22 is pushed backwards, so as to better enable the airflow to flow backwards, reduce the airflow loss, and improve the efficiency.

In an embodiment, as in the fifth embodiment, referring to fig. 7, a projection of the outer edge 224 of each moving blade 22 on the meridian plane of the moving blade 22 is a multi-segment line, that is, an edge line of the outer edge 224 of each moving blade 22 on the meridian plane of the moving blade 22 is a multi-segment line, so as to facilitate the processing of the outer edge 224 at the moving blade.

In one embodiment, as shown in the ninth embodiment, referring to fig. 11, the projection of the outer edge 224 of each moving blade 22 on the meridian plane of the moving blade 22 is arc-shaped, so that the air flow is smoothly driven to rotate backward at the outer edge 224 of the moving blade 22.

In an embodiment, as in the fourth embodiment, referring to fig. 6, a projection of the outer edge 224 of each moving blade 22 on the meridian plane of the moving blade 22 is a multi-segment arc, that is, an edge line of the outer edge 224 of each moving blade 22 on the meridian plane of the moving blade 22 is a multi-segment arc, the multi-segment arc includes a plurality of arc segments which are sequentially and tangentially connected, so that from front to back, at least two radially outwardly protruding portions can be formed on the outer edge 224 of each moving blade 22, thereby reducing a pressure surface and a suction surface pressure difference of the outer edge 224 of the moving blade 22, reducing leakage of the leading edge 221 of the moving blade 22 and interference loss at the rear end of the outer edge 224 of the moving blade 22, and effectively improving noise in a dynamic and static interference area.

In one embodiment, as shown in fig. 12 in the tenth embodiment, and also referring to fig. 1, a diffuser 30 is installed in the casing 11, the diffuser 30 includes a base 31 and a plurality of stationary blades 33, and the annular air duct 111 is formed between the inner surface of the casing 11 and the base 31. A flow passage 330 for guiding the flow of the gas flow is formed between two adjacent stationary blades 33. The plurality of stationary blades 33 are arranged along the circumferential direction of the base 31, so that when the airflow passes through the flow passage 330 between two adjacent stationary blades 33 on the circumferential side of the base 31, the airflow is guided by the stationary blades 33 to flow, the airflow is more stable, the vortex is reduced, and the energy loss is reduced.

In one embodiment, a cylinder may be disposed in the casing 11, so that an annular air duct 111 is formed between the inner surface of the casing 11 and the cylinder.

In one embodiment, referring to fig. 1, a bearing 16 is installed in the housing 11, and the bearing 16 is sleeved on the rotating shaft 12 to support the rotating shaft 12 in the housing 11, so that the rotating shaft 12 can stably and flexibly drive the impeller 20 to rotate in the housing 11.

In one embodiment, referring to FIG. 1, the bearing 16 is mounted in the base 31 of the diffuser 30 to facilitate supporting the bearing 16.

In one embodiment, referring to fig. 12, the cross section of the base 31 is circular, so that when the airflow flows along the axial direction of the base 31 by rotating radially from the biased base 31, the airflow flows to the peripheral side of the base 31 at similar distances, and the airflow is subjected to similar resistance, thereby the airflow flows to the peripheral side of the base 31 more smoothly, and the energy loss is reduced.

In one embodiment, referring to fig. 12, the length direction of each stationary blade 33 is inclined to the axial direction of the base 31, and the length direction of each stationary blade 33 refers to the direction in which the head and the tail of the stationary blade 33 are connected, so that the airflow can be gradually guided to change the direction when flowing through the flow channel 330 between two stationary blades 33, and the energy loss of the airflow is reduced.

In one embodiment, as in the second embodiment, referring to fig. 3, the moving blades 20 further include a front cover plate 24, the front edge 221 of each moving blade 20 is connected to the front cover plate 24, the front cover plate 24 has an air inlet 241 at the middle portion, and the front cover plate 24 is disposed so that the moving blades 20 form a closed structure, thereby improving the efficiency of the moving blades 20.

In one embodiment, referring to FIG. 3, the outer diameter of the front shroud 24 is greater than or equal to the outer diameter of the back shroud 21 so that the airflow from the impeller 20 can be better directed backwards to reduce the turning angle of the airflow to the axial direction, thereby reducing flow losses.

In one embodiment, as shown in the third embodiment, referring to fig. 4 and 5, the outer diameter of the front shroud 24 is larger than the outer diameter of the rear shroud 21, and the distance from the outer edge 224 of each moving blade 22 to the central axis 210 of the rear shroud 21 is smaller than the radius of the contour of the front shroud 24, that is, the outer edge 224 of each moving blade 22 is located inside the front shroud 24, so that the airflow flowing out from the impeller 20 can be better guided to flow backwards by the outer edge 224 of the moving blade 22, so as to reduce the turning angle of the airflow to the axial direction, and further reduce the flow loss.

In one embodiment, as in the eleventh embodiment, referring to fig. 13 and 14, in the diffuser 30 of the blowing device 100: the plurality of stationary blades 33 are sequentially arranged in a plurality of rows along the axial direction of the base 31, the number of the stationary blades 33 in each row of the stationary blades 32 is a plurality, and the plurality of the stationary blades 33 in each row of the stationary blades 32 are arranged along the circumferential direction of the base 31; that is, the plurality of stationary blades 33 are arranged in a plurality of rows, the plurality of rows of stationary blades 32 are arranged in the axial direction of the base 31, the number of the stationary blades 33 in each row of the stationary blades 32 is plural, the plurality of stationary blades 33 in each row of the stationary blades 32 are arranged in the circumferential direction of the base 31, the plurality of stationary blades 33 are arranged in a plurality of rows in the axial direction of the base 31, and the flow of the air can be gradually guided by the plurality of rows of the stationary blades 32, so that the energy loss is reduced, and the diffuser effect is improved.

For convenience of description, define: the plurality of vanes 33 are divided into two rows in the axial direction of the base 31, and the first row of vanes 32a and the second row of vanes 32b are arranged from top to bottom in this order, that is, the first row of vanes 32a is the upper row of the second row of vanes 32b, and the second row of vanes 32b is the lower row of the first row of vanes 32 a. The plurality of stationary blades 33 are divided into three rows in the axial direction of the base 31, and the first row of stationary blades 32a, the second row of stationary blades 32b, and the third row of stationary blades are arranged in this order from the top down. The plurality of stationary blades 33 are divided into four or more rows in the axial direction of the base 31, and the first row of stationary blades, the second row of stationary blades, and the third row of stationary blades … … are arranged in this order from top to bottom. That is, when the plurality of stationary blades 33 are arranged in N (N is a positive integer, N is not less than 2) rows along the axial direction of the base 31, the plurality of stationary blades are sequentially divided into a first row and a second row … … Nth row from top to bottom; the M-1 th row of static blades is a previous row of static blades of the M-1 th row of static blades, the M-th row of static blades is a next row of static blades of the M-1 th row of static blades, wherein M is a positive integer and is less than or equal to N.

In one embodiment, referring to fig. 13 and 14, in two adjacent rows of stationary blades 32: the number of the stationary blades 33b in the next row of the stationary blades 32b is 1.5 to 4 times the number of the stationary blades 33a in the previous row of the stationary blades 32 a. The number of the stationary blades 33a in the previous row of the stationary blades 32a is relatively less, and the number of the stationary blades 33b in the next row of the stationary blades 32b is more, so that when the airflow sequentially passes through each row of the stationary blades 32, the guiding airflow can be gradually enhanced, the speed of the airflow is reduced, and the supercharging effect is improved.

In one embodiment, referring to FIG. 14, in two adjacent rows of stationary blades 32: the trailing portion of each stationary blade 33a in the upper row of the stationary blades 32a is deviated from the leading portion of the adjacent lower row of the corresponding stationary blade 33b in the circumferential direction of the base 31 by an angle of 20 degrees or less. Namely, a plane passing through the blade root at the tail of each stationary blade 33a in the previous row of stationary blades 32a and the axis of the base 31, and a plane passing through the blade root at the head of the corresponding stationary blade 33b in the next row and the axis of the base 31, wherein the included angle between the two planes is less than or equal to 20 degrees, so that the non-uniformity of airflow flow is reduced, the flow separation loss is reduced, and the supercharging effect is improved.

In one embodiment, the housing 11 may be integrally formed with the hood 14 to ensure the connection strength between the frame and the hood 14. In one embodiment, the housing 11 and the hood 14 are separately manufactured to facilitate the manufacturing process and the precise design of the air guide passage 143.

In one embodiment, referring to FIG. 15, in a twelfth embodiment, in two adjacent rows of stationary blades 32: the tail part of each stationary blade 33a in the previous row of stationary blades 32a is aligned with the head part of the corresponding stationary blade 33b in the next adjacent row, so that the flow nonuniformity is reduced, the flow separation loss is reduced, and the supercharging effect is improved.

In one embodiment, referring to FIG. 15, in two adjacent rows of stationary blades 32: the stator blades 33a of the upper row of stator blades 32a and the stator blades 33b of the lower row of stator blades 32b are arranged at intervals in the axial direction of the base 31 for convenient processing.

In one embodiment, referring to fig. 15, the diffuser 30 includes a plurality of bases 31 supporting rows of stationary blades 32, respectively, and each row of stationary blades 32 is mounted on a corresponding base 31 for easy manufacturing.

In an embodiment, referring to fig. 15, during the manufacturing process, one stationary blade 33b in the next row of stationary blades 32b may be aligned with one stationary blade 33a in the previous row of stationary blades 32a, and then the two bases 31 may be fixed, so that the manufacturing process and the assembly process are convenient.

The air supply device 100 of the embodiment of the application can be applied to electric appliances such as a dust collector, a range hood, a blower, a fan and the like.

The embodiment of the application also discloses a dust collector which comprises the air supply device 100 in any embodiment. The dust collector of the embodiment of the application uses the air supply device 100, the air flow loss is small, the power is high, the efficiency is high, and the noise is low.

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. The air supply device is characterized by comprising a casing, an impeller arranged on the front side of the casing, a rotating shaft driving the impeller to rotate, a motor driving the rotating shaft to rotate and a fan cover covering the impeller, wherein the fan cover is connected with the casing, the motor is arranged in the casing, the impeller comprises a rear cover plate arranged on the rotating shaft and a plurality of moving blades arranged on the rear cover plate, an air inlet is formed in the front side of the fan cover, a flow guide air passage is formed between the inner surface of the fan cover and the radial outer side of the impeller, and an annular air passage communicated with the flow guide air passage is formed in the casing; each moving blade is provided with an inner edge close to the central axis of the rear cover plate and an outer edge radially far away from the central axis of the rear cover plate, the outer edge of each moving blade is outwards projected and extended, and each outer edge is projected out of the rear cover plate;

the distance from each part on the outer edge of each moving blade to the central axis of the rear cover plate is gradually reduced from front to back;

the outer edge of each moving blade is in a convex arch shape in the middle of an edge line projected by the meridian plane of the moving blade; or the outer edge of each moving blade is inwards sunken in the middle of an edge line projected on the meridian plane of the moving blade.

2. The blowing device of claim 1, wherein: the distance from the front end of the outer edge of each moving blade to the central axis of the rear cover plate is greater than the distance from the rear end of the outer edge to the central axis of the rear cover plate.

3. The air supply apparatus of claim 1, wherein: the middle portion of the outer edge of each of the moving blades is extended convexly toward the rear side.

4. The air supply apparatus of claim 1, wherein: the outer edge of each moving blade is close to one section of the rear cover plate and protrudes backwards out of the rear cover plate.

5. The air supply apparatus of claim 1, wherein: the projection of the outer edge of each moving blade on the meridian plane of the moving blade is in a curve shape; or the projection of the outer edge of each moving blade on the meridian plane of the moving blade is in an arc shape; or the projection of the outer edge of each moving blade on the meridian plane of the moving blade is a multi-section arc, and the multi-section arc comprises a plurality of arc sections which are sequentially and tangentially connected.

6. The air supply arrangement as claimed in any of claims 1-5, characterized in that: the movable impellers further comprise front cover plates, the front edges of the movable impellers are connected with the front cover plates, and air inlets are formed in the middle of the front cover plates.

7. The air supply apparatus of claim 6, wherein: the outer diameter of the front cover plate is larger than or equal to that of the rear cover plate.

8. The air supply apparatus of claim 6, wherein: the outer diameter of the front cover plate is larger than that of the rear cover plate, and the distance from each part on the outer edge of each moving blade to the central axis of the rear cover plate is smaller than the radius of the outline of the front cover plate.

9. The air supply arrangement as claimed in any of claims 1-5, characterized in that: the middle part of the rear cover plate is convexly provided with a hub, and the hub is arranged on the rotating shaft.

10. The air supply apparatus of claim 9, wherein: the inner edge of each moving blade is spaced apart from the hub.

11. The air supply arrangement as claimed in any of claims 1-5, characterized in that: the distance from the front end of the outer edge of each moving blade to the central axis of the rear cover plate is less than half of the inner diameter of the fan cover.

12. The air supply arrangement as claimed in any of claims 1-5, characterized in that: a diffuser is installed in the casing and comprises a base installed in the casing and a plurality of stationary blades arranged along the circumferential direction of the base, and the annular air duct is formed between the inner surface of the casing and the base; and a flow channel for guiding airflow is formed between every two adjacent static blades.

13. The air supply arrangement as recited in claim 12, further comprising: the plurality of the static blades are arranged in sequence along the axial direction of the base to form a plurality of rows, the quantity of the static blades in each row of the static blades is a plurality, and the static blades in each row of the static blades are arranged along the circumferential direction of the base.

14. The air supply apparatus of claim 13, wherein, in two adjacent rows of stationary blades: the number of the static blades in the next row of static blades is 1.5-4 times of that of the static blades in the previous row of static blades.

15. The dust catcher, its characterized in that: comprising an air supply arrangement as claimed in any of claims 1-14.