CN112879319A - Air supply arrangement and dust catcher - Google Patents
Air supply arrangement and dust catcher Download PDFInfo
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- CN112879319A CN112879319A CN201911199994.3A CN201911199994A CN112879319A CN 112879319 A CN112879319 A CN 112879319A CN 201911199994 A CN201911199994 A CN 201911199994A CN 112879319 A CN112879319 A CN 112879319A
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- line
- air supply
- diffuser
- impeller
- angle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/542—Bladed diffusers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an air supply device and a dust collector, wherein the air supply device is provided with an air supply outlet and comprises a rotating shaft, an impeller arranged on the rotating shaft and a diffuser positioned on one side of the impeller, which is far away from the air supply outlet; the diffuser comprises a base and a plurality of stationary blades which are convexly arranged on the outer ring surface of the base at intervals along the circumferential direction; the rack is fittingly installed at one end of the diffuser, which is far away from the diffuser, and a convex block which is convex towards the diffuser is arranged between the inner wall surface of the outer cylinder and the outer wall surface of the inner cylinder; the lug and the adjacent stationary blade are arranged at intervals relatively to form a flow guide channel, and the flow guide channel gradually turns to the outer wall surface of the inner barrel in the direction from the impeller to the rack. According to the technical scheme, the air flow can be effectively guided, so that direct impact of the air flow on components such as the motor is reduced, the flow loss can be reduced, the efficiency of the air supply device is improved, and the power consumption is reduced.
Description
Technical Field
The invention belongs to the technical field of dust collection equipment, and particularly relates to an air supply device and a dust collector.
Background
With the increasing living standard of people, more and more consumers begin to use the dust collector for cleaning. The dust collector generally includes a rotating shaft, an impeller arranged on the rotating shaft, a motor driving the rotating shaft to rotate, a diffuser arranged at the rear of the impeller, a frame arranged at the rear of the diffuser and connected with the motor, and a fan cover covering the impeller and the diffuser; when the fan is in actual use, the motor drives the impeller to rotate, a large vacuum degree is formed at the air supply outlet of the fan cover, airflow is sucked from the air supply outlet, and flows out after passing through the diffuser, the rack and the motor at the rear part after obtaining large kinetic energy through the impeller flow passage. However, in the existing vacuum cleaners, especially the handheld vacuum cleaners, because the volume of the air supply device used therein is usually small and the rotation speed is usually high, which is 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.
Disclosure of Invention
The embodiment of the invention aims to overcome the defects of the prior art and provides an air supply device, which aims to solve the problems of large flow loss, low efficiency and large power consumption of the air supply device of the existing dust collector.
An embodiment of the present invention provides an air supply device, which has an air supply outlet, and includes:
a rotating shaft is arranged at the position of the rotating shaft,
the impeller is arranged on the rotating shaft and corresponds to the position of the air supply outlet;
a diffuser arranged on one side of the impeller departing from the air supply outlet and comprising an annular base and a plurality of stationary blades arranged on the outer annular surface of the base at intervals in a protruding manner along the circumferential direction,
the rack is adaptive to one end of the diffuser, which is far away from the impeller, and comprises an inner cylinder and an outer cylinder, wherein a convex block protruding towards the diffuser is arranged between the inner wall surface of the outer cylinder and the outer wall surface of the inner cylinder;
the lug and the adjacent stationary blade are arranged at intervals relatively to form a flow guide channel, and the flow guide channel gradually turns to the outer wall surface of the inner barrel in the direction from the impeller to the rack.
Optionally, on a first planar cascade diagram 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 a first forehead line, a line connected by a thickness midpoint of the stationary blade is a first middle line, and an included angle between an extension line of the first middle 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 an outlet placing angle β; on a second plane cascade graph formed after a circumferential vertical section taken at the middle position of the thickness of the bump is unfolded, 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 bump as a second center line, and taking an included angle between an extension line of the head of the bump and the second forehead line as an inlet placing angle alpha 2; α 2 ═ β ± 10 °.
Optionally, the rack further includes a plurality of connecting ribs radiating outward along the center of the rack, the inner wall surface of the outer cylinder is connected with the outer wall surface of the inner cylinder through the connecting ribs, the bump is disposed on the connecting ribs, the thickness of the bump is gradually reduced from the root to the head, and the end face of the head of the bump is in a fillet arrangement.
Optionally, the plurality of connecting ribs are arranged on the rack at uniform intervals along the circumferential direction, and the bumps are arranged on the connecting ribs and close to one side of the outer barrel.
Optionally, along the protruding a plurality of connection bosss that are equipped with of circumference on the outer wall of inner tube, the inner ring face of diffuser with the outer wall adaptation of inner tube is cup jointed, the orientation of diffuser the lower terminal surface of frame has the overlap joint district, the overlap joint district is close to the inner ring face setting of diffuser, and with the top end face adaptation overlap joint of connecting the boss.
Optionally, the base includes an upper ring section facing the impeller and a lower ring section facing the frame, and an outer ring radius of the upper ring section is gradually increased in a direction from the impeller to the frame.
Optionally, the diffuser has a meridian projection plane, the head of the stationary blade is projected on the meridian projection plane to obtain a leading edge line, the outer ring surface of the base corresponds to an outer curve on the meridian projection plane, an intersection point of the outer curve and the leading edge line is a first intersection point, an included angle between tangents of the leading edge line and the outer curve at the first intersection point is θ 1, and an angle range of θ 1 is 70 ° to 110 °;
the tail of the stationary blade is projected on the meridian projection plane to obtain a tail edge line, the intersection point of the outer curve and the tail edge line is a second intersection point, the included angle between the tail edge line and the tangent line of the outer curve at the second intersection point is theta 2, and the angle range of the theta 2 is 70 degrees to 110 degrees.
Optionally, on the first planar cascade diagram, a connecting line of the stationary blade towards the corresponding point of the head of the base is a first forehead line, and an included angle between an extension line of the head of the stationary blade and a tangent line of the first forehead line at the head of the stationary blade is an inlet placing angle α 1, wherein an angle of α 1 is in a range of 25 ° to 60 °.
Optionally, the air supply device further includes a motor and a fan housing provided with the air supply outlet, the motor is mounted on the rotating shaft and located below the frame, and the fan housing encloses the impeller and the diffuser.
The embodiment of the invention also provides a dust collector which comprises the air supply device.
Based on the structural design, in the technical scheme of the embodiment of the invention, the diffuser is provided with the static blades, the connecting ribs of the frame are provided with the bumps, and a specially designed angle relation range A between an outlet installation angle beta of the tail part of the static blades and an inlet installation angle A of the head part of the bumps is beta +/-10 degrees, so that a flow guide channel can be formed between the tail part of the static blades and the head part of the bumps in the angle relation range, and the flow guide channel can effectively guide airflow which is about to enter the frame and the motor, so that the airflow can gradually deviate from the original flow direction, the direct impact of the airflow on the motor can be reduced, the flow loss of the airflow is reduced, the efficiency of the air supply device is improved, and the power consumption is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of an air supply device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a diffuser of an air supply device according to an embodiment of the present invention;
FIG. 3 is a first planar vane diagram of the diffuser of FIG. 3 provided by an embodiment of the present invention;
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 second planar cascade diagram of the gantry of FIG. 4 provided by an embodiment of the present invention;
FIG. 6 is a top view of a frame provided by an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a diffuser of an air supply device according to an embodiment of the present invention, taken along a meridian projection plane;
FIG. 8 is a meridional projection of the stationary vane of FIG. 7 as provided by an embodiment of the present invention.
The reference numbers illustrate:
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention and are not intended to limit the invention.
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 invention 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 invention, 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 illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of 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 invention.
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 invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The embodiment of the invention provides an air supply device.
Referring to fig. 1, 3 and 5, in an embodiment, the blowing device has a blowing opening 710 including a rotating shaft 100, an impeller 200, a diffuser 300 and a frame 400; the impeller 200 is installed on the rotating shaft 100 and corresponds to the air supply opening 710; the diffuser 300 is disposed on a side of the impeller 200 facing away from the air supply outlet 710, and includes an annular base 310 and a plurality of stationary blades 320 protruding from an outer annular surface of the base 310 at intervals in a circumferential direction; the frame 400 is fittingly installed at one end of the diffuser 300 away from the impeller 200, and includes an inner cylinder 410 and an outer cylinder 420 coaxially sleeved, the inner wall surface of the outer cylinder 420 and the outer wall surface of the inner cylinder 410 are connected by a plurality of connecting ribs 430 radiating outwards along the center of the frame 400, and the connecting ribs 430 are provided with protrusions 440 protruding towards the diffuser 300; the protrusions 440 are spaced apart from the adjacent stationary blades 320 to form a guide passage, and the guide passage is gradually formed toward the outer wall surface of the inner tube 410 in a direction from the impeller 200 to the frame 400.
Specifically, as shown in fig. 2 to 5, on a first planar cascade diagram formed after a development of a circumferential horizontal section taken at a height intermediate position of the stationary blade 320, a connecting line of corresponding points of the tail portion of the stationary blade 320 facing away from the base 310 is a first forehead line 11 (radius R2), a line formed by connecting thickness midpoints of the stationary blades 320 is a first center line 12, and an included angle between an extension line of the first center line 12 at the tail portion of the stationary blade 320 and a tangent line of the first forehead line 11 at the tail portion of the stationary blade 320 is an outlet placement angle β; on a second planar cascade graph formed by unfolding a circumferential vertical section taken from the middle position of the thickness of the bump 440, a connecting line of corresponding points of the bump 440 facing the head of the diffuser 300 is taken as a second forehead line 21, a line formed by connecting the thickness midpoints of the bumps 440 is taken as a second middle line 22, and an included angle formed by the extension line of the second middle line 22 at the head of the bump 440 and the second forehead line 21 is taken as an inlet placing angle alpha 2; α 2 ═ β ± 10 °.
It should be noted that the air supply device is particularly suitable for a handheld dust collector, and the air supply device of the dust collector comprises the related components such as the circuit board 500, the motor 600 and the fan cover 700 besides the above structure. Wherein, the direction from the air supply opening 710 to the motor 600 is the direction from the top to the bottom, the rotating shaft 100 has a bearing part 110, the bearing part 110 is matched, positioned and sleeved with the inner ring surface of the inner cylinder 410 of the frame 400; the motor 600 is mounted on the rotating shaft 100 and located below the frame 400, the circuit board 500 is mounted below the motor 600, the motor 600 is electrically connected to the circuit board 500 and controlled by a relevant control device to open and close and adjust the rotating speed, and the fan housing 700 encloses the impeller 200 and the diffuser 300 and has an air supply opening 710 corresponding to the head position of the impeller 200. In the process of the air flow direction as shown by the arrow in fig. 1, the rotating shaft 100 drives the impeller 200 to rotate at a high speed, a large vacuum degree is formed at the inlet of the fan housing 700, the air flow is sucked from the air supply port of the fan housing 700, and after obtaining large kinetic energy through the flow channel of the impeller 200, the air flow sequentially passes through the diffuser 300, the frame 400 and the motor 600 at the rear and then flows out.
Based on the structural design, in the embodiment, the diffuser 300 is provided with the stationary blade 320, the connecting rib 430 of the frame 400 is provided with the bump 440, and the outlet installation angle β of the tail of the stationary blade 320 and the inlet installation angle α 2 of the head of the bump 440 have a specially designed angular relationship range α 2 ═ β ± 10 °, so that in the angular relationship range, a flow guide channel can be formed between the tail of the stationary blade 320 and the head of the bump 440, and the flow guide channel can effectively guide the airflow which is about to enter the frame 400 and the motor 600, so that the airflow can gradually deviate from the original flow direction, thereby reducing the direct impact of the airflow on the motor 600, reducing the flow loss of the airflow, being beneficial to improving the efficiency of the air supply device, and reducing the power consumption.
Here, because the impeller 200 rotates at a high speed, the airflow thrown out from the tail of the impeller 200 away from the air supply outlet should form a certain inclination angle with the radial direction, so the stationary blades 320 on the diffuser 300 and the bumps 440 on the frame 400 also form a certain inclination angle with the radial direction in the same rotation direction, which can better match the angle of the airflow thrown out from the impeller 200, is beneficial to further reducing the airflow impact, improves the air supply efficiency and reduces the energy consumption. After a plurality of tests, the angular relationship between α 2 and β may further preferably be in a range of α 2 ═ β ± 2 °, and of course, α 2 ═ β has an optimal flow guiding performance for the air flow.
Referring to fig. 4 and 5, in the present embodiment, the end surface of the head of the bump 440 is rounded, so that the head of the bump 440 is closer to a streamline, the airflow passing through the head of the bump 440 flows more smoothly, and the flow guiding effect of the bump 440 is better.
Further on this basis, in the present embodiment, the thickness of the bump 440 is tapered from the root to the head. Of course, in other embodiments, the thickness of the bump 440 may be equal from the root to the head, but in this embodiment, the streamline arrangement tapering in the direction opposite to the airflow direction may further improve the flow guiding performance of the bump 440.
Referring to fig. 4 and 6, in the present embodiment, in order to make the airflow guiding more uniform and the airflow impact pressure distribution on the rack 400 and the motor 600 more uniform, a plurality of connecting ribs 430 are preferably disposed on the rack 400 at uniform intervals along the circumferential direction, and the protrusions 440 are preferably disposed on one side of the connecting ribs 430 close to the outer cylinder 420. Specifically, the plurality of connecting ribs 430 are symmetrically distributed radially from the center of the rack 400, but the plurality of connecting ribs 430 may be asymmetrically distributed in other embodiments. In addition, a mounting hole 431 is further formed on the connecting rib 430 adjacent to the projection 440, and the frame 400 may be fixedly connected to the motor 600 by a fixing member penetrating through the mounting hole 431.
Further, referring to fig. 1 and 4, in the present embodiment, a plurality of connection bosses 450 are convexly disposed on an outer wall surface of the inner cylinder 410 along a circumferential direction, an inner ring surface of the diffuser 300 is in fit connection with the outer wall surface of the inner cylinder 410, a lower end surface of the diffuser 300 has a lap joint region, and the lap joint region is disposed adjacent to the inner ring surface of the diffuser 300 and in fit lap joint with top end surfaces of the connection bosses 450. Specifically, in order to save space, the concave avoiding groove 330 is arranged on the lower end surface of the diffuser 300, the bottom of the connecting boss 450 is connected with the connecting rib 430 to play a role of a certain reinforcing rib, and during actual assembly, the connecting boss 450 and the outer wall surface of the inner cylinder 410 form an installation step, namely, a step-type positioning installation is formed between the connecting boss 450 and the area, adjacent to the inner annular surface of the diffuser 300, of the groove bottom of the avoiding groove 330 of the diffuser 300. However, the design is not limited thereto, and in other embodiments, the connection boss 450 may also be a full-circle ring-shaped design, but compared to the present embodiment, the design reduces the flow passage area between two connection ribs to a certain extent.
Referring to fig. 1, 2 and 7, in the present embodiment, the base 310 includes an upper ring section 311 facing the impeller 200 and a lower ring section 312 facing the frame 400, and the outer ring radius of the upper ring section 311 increases gradually along the top-to-bottom direction, so that the outer ring surface of the upper ring section 311 forms an inclined slope, thereby facilitating the guiding and flowing of the airflow, and the airflow stamping pressure on the base 310 can also obtain better stress dispersion and conduction, thereby facilitating the improvement of the service life of the diffuser 300. In addition, the inner and outer ring radii of the lower ring section 312 are constant, which facilitates stable installation of the diffuser 300.
Further, referring to fig. 2 and 3, in the present embodiment, on the first planar cascade diagram, a connecting line of the stationary blade 320 toward a corresponding point of the head of the base 310 is a first frontal line 13, a radius of the connecting line is R1, an included angle between an extension line of the head of the stationary blade 320 of the first central line 12 and a tangent line of the first frontal line 13 at the head of the stationary blade 320 is an inlet placing angle α 1, wherein an angle range of α 1 is 25 ° to 60 °. It will be appreciated that the flow of air from the aft portion of the impeller 200 rotating at high speed is angled in a given direction of rotation, and that the angle at which the stationary vanes 320 meet the flow of air is more closely matched to the actual flow direction of air when the inlet angle α 1 is set within the preferred range of angles. Therefore, more kinetic energy impacted by the airflow can be recovered into static pressure, in other words, the design can effectively reduce the flow kinetic energy loss of the airflow, and further is favorable for further improving the efficiency of the air supply device and reducing the energy consumption.
Similarly, referring to fig. 2, fig. 7 and fig. 8, in the present embodiment, the diffuser 300 has a meridian projection plane 14, the meridian projection plane 14 is a projection plane obtained by projecting the outer surface of the base 310, the inner surface of the wind shield 700 and the surface of the stationary blade 320 of the diffuser 300 on the section along an arc direction with a corresponding point on the axis as a center of a circle. The head of the stationary blade 320 is projected on the meridian projection plane 14 to obtain a leading edge line 16, the outer ring surface of the base 310 corresponds to an outer curve 15 on the meridian projection plane 14, the intersection point of the outer curve 15 and the leading edge line 16 is a first intersection point, the included angle between tangents of the leading edge line 16 and the outer curve 15 at the first intersection point is theta 1, and the angle range of the theta 1 is 70-110 degrees; the tail of the stationary blade 320 is projected on the meridian projection plane 14 to obtain a tail edge line 17, the intersection point of the outer curve 15 and the tail edge line 17 is a second intersection point, the included angle between the tail edge line 17 and the tangent of the outer curve 15 at the second intersection point is theta 2, and the angle range of theta 2 is 70-110 degrees, so that when the two angles of the stationary blade 320 are designed to meet the preferred angle range, the flowing kinetic energy loss of the airflow can be further effectively reduced.
The invention also provides a dust collector (not shown in the figure), which comprises the air supply device, a main body, a dust collecting cup detachably connected with the main body, a dust collection assembly and the like, wherein the air supply device is accommodated in the main body, an air suction channel of the dust collection assembly is communicated with an air supply outlet of the air supply device, negative pressure can be generated in the main body after the air supply device is started, then outside air containing dust can be sucked into the dust collector through the air suction channel, and then the dust is separated, filtered and collected in the dust collecting cup. The specific structure of the air supply device refers to the above embodiments, and since the dust collector adopts all technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not repeated herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An air supply device having an air supply opening, comprising:
a rotating shaft is arranged at the position of the rotating shaft,
the impeller is arranged on the rotating shaft and corresponds to the position of the air supply outlet;
a diffuser arranged on one side of the impeller departing from the air supply outlet and comprising an annular base and a plurality of stationary blades arranged on the outer annular surface of the base at intervals in a protruding manner along the circumferential direction,
the rack is adaptive to one end of the diffuser, which is far away from the impeller, and comprises an inner cylinder and an outer cylinder, wherein a convex block protruding towards the diffuser is arranged between the inner wall surface of the outer cylinder and the outer wall surface of the inner cylinder;
the lug and the adjacent stationary blade are arranged at intervals relatively to form a flow guide channel, and the flow guide channel gradually turns to the outer wall surface of the inner barrel in the direction from the impeller to the rack.
2. The air supply apparatus according to claim 1, wherein, in a first planar grid pattern formed by developing a circumferential horizontal cross section taken at a height intermediate position of the stationary blade, a connecting line of corresponding points of the trailing portions of the stationary blades facing away from the base is a first forehead line, a line connecting thickness midpoints of the stationary blades is a first center line, and an angle between an extension line of the first center line at the trailing portion of the stationary blade and a tangent line of the first forehead line at the trailing portion of the stationary blade is an outlet placement angle β; on a second plane cascade graph formed after a circumferential vertical section taken at the middle position of the thickness of the bump is unfolded, 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 bump as a second center line, and taking an included angle between an extension line of the head of the bump and the second forehead line as an inlet placing angle alpha 2; α 2 ═ β ± 10 °.
3. The blowing device according to claim 2, wherein the frame further includes a plurality of connecting ribs radiating outward along a center of the frame, an inner wall surface of the outer cylinder and an outer wall surface of the inner cylinder are connected by the connecting ribs, the projection is provided on the connecting ribs, a thickness of the projection is tapered from a root portion to a head portion, and a head end surface of the projection is provided in a rounded shape.
4. The blowing device according to claim 3, wherein a plurality of the tie bars are provided at even intervals in the circumferential direction on the frame, and the projections are provided on the tie bars on a side close to the outer cylinder.
5. The blowing device according to claim 1, wherein a plurality of connection bosses are convexly provided on an outer wall surface of the inner cylinder in a circumferential direction, an inner ring surface of the diffuser is fittingly fitted with the outer wall surface of the inner cylinder, a lower end surface of the diffuser facing the frame has a lap joint region, and the lap joint region is disposed adjacent to the inner ring surface of the diffuser and fittingly overlapped with a top end surface of the connection boss.
6. The air supply arrangement as recited in claim 5 wherein the base includes an upper ring segment facing the impeller and a lower ring segment facing the frame, the upper ring segment having an outer ring radius that increases in a direction from the impeller to the frame.
7. The blower apparatus according to claim 5, wherein the diffuser has a meridian projection plane on which a leading edge line is projected by a head of the stationary blade, the outer ring surface of the base has an outer curve corresponding thereto, an intersection of the outer curve and the leading edge line is a first intersection, an angle θ 1 between the leading edge line and a tangent of the outer curve at the first intersection is θ 1, and an angle of θ 1 ranges from 70 ° to 110 °;
the tail of the stationary blade is projected on the meridian projection plane to obtain a tail edge line, the intersection point of the outer curve and the tail edge line is a second intersection point, the included angle between the tail edge line and the tangent line of the outer curve at the second intersection point is theta 2, and the angle range of the theta 2 is 70 degrees to 110 degrees.
8. The air supply apparatus according to any of claims 1 to 7, wherein on the first planar grating pattern, a connecting line of the stationary blades toward a corresponding point of the heads of the bases is a first frontal line, and an angle between an extension line of the first center line at the heads of the stationary blades and a tangent line of the first frontal line at the heads of the stationary blades is an inlet placement angle α 1, wherein an angle of α 1 ranges from 25 ° to 60 °.
9. The air supply apparatus as recited in claim 1, further comprising a motor mounted on the rotary shaft and located below the frame, and a fan housing provided with the air supply opening, the fan housing enclosing the impeller and the diffuser.
10. A vacuum cleaner comprising an air supply apparatus as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199994.3A CN112879319A (en) | 2019-11-29 | 2019-11-29 | Air supply arrangement and dust catcher |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199994.3A CN112879319A (en) | 2019-11-29 | 2019-11-29 | Air supply arrangement and dust catcher |
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| CN112879319A true CN112879319A (en) | 2021-06-01 |
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| CN201911199994.3A Pending CN112879319A (en) | 2019-11-29 | 2019-11-29 | Air supply arrangement and dust catcher |
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Application publication date: 20210601 |
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