A multi-stage impeller assembly and a vacuum cleaner

Abstract

The application provides a multi-stage impeller assembly, which comprises a shell, a base, a motor unit, a guide air unit and at least one stage of dynamic and static blade units, the motor unit is fixed to the base, the shell is fixed to the base, the dynamic and static blade units comprise a dynamic blade impeller and a static blade impeller, the dynamic blade impeller and the static blade impeller are coaxially arranged, the dynamic blade impeller is fixed to the output shaft of the motor unit, the outer wall of the static blade impeller is limitingly fixed to the inner wall of the shell, the outer wall of the guide air unit is limitingly fixed to the inner wall of the shell, along the air flow direction, the air flow sequentially passes through the guide air unit, the dynamic blade impeller and the static blade impeller, and the multi-stage dynamic and static blade units are coaxially arranged in sequence. The application also provides a dust collector with the multi-stage impeller assembly. The application has the characteristics of large air volume, small size, large power mass ratio, small wind noise, improved air flow vacuum degree and improved fan efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical equipment, and particularly relates to a multistage impeller assembly and a dust collector. BACKGROUND

[0002] With the development of social economy, people's pursuit of daily life is getting higher and higher, so the way of daily housework has also changed. Many families have already got used to using a dust collector for daily cleaning. Even in the garage, basement and other places, due to the narrow space and the accumulation of dust, a small dust collector with large suction function is often needed for cleaning.

[0003] At present, the small household handheld dust collector adopts a centrifugal or mixed flow impeller in the air power part. In order to obtain high suction power, the diameter of the impeller is often designed to be large, and the speed is high, so that the suction power can be improved. However, this way requires higher strength of the impeller material, thus increasing the material cost, and the noise of the large diameter is also large. Moreover, with the increase of the suction air volume, the vacuum degree of the dust collector decreases obviously, and the working efficient area is relatively narrow, resulting in poor use effect. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art, and provides a multistage impeller assembly and a dust collector, which solves the problems of large size, large noise and poor use effect of the dust collector in the prior art.

[0005] In order to achieve the above purpose, the present application provides a multistage impeller assembly, which comprises a shell, a base, a motor unit, an air guide unit and at least one dynamic and static blade unit. The motor unit is fixed to the base, and the shell is fixed to the base. The dynamic and static blade unit comprises a dynamic blade impeller and a static blade impeller, which are coaxially arranged. The dynamic blade impeller is fixed to the output shaft of the motor unit, and the outer wall of the static blade impeller is limitingly fixed with the inner wall of the shell. The outer wall of the air guide unit is limitingly fixed with the inner wall of the shell. Along the airflow direction, the airflow passes through the air guide unit, the dynamic blade impeller and the static blade impeller in sequence. The multistage dynamic and static blade units are coaxially arranged in sequence.

[0006] Further, the air guide unit comprises an air guide inner wheel, an air guide outer wheel and an air guide blade group. The air guide blade group is arranged between the air guide inner wheel and the air guide outer wheel. The shell comprises a lower shell cavity and an upper shell cavity. The upper shell cavity is provided with a connecting seat. The air guide inner wheel is fixed to the connecting seat. The outer wall of the air guide outer wheel is limitingly fixed with the inner wall of the upper shell cavity. The dynamic and static blade unit is arranged in the upper shell cavity, and the motor unit is arranged in the lower shell cavity.

[0007] Further, the moving blade wheel comprises a moving blade inner wheel and a moving blade blade group, the moving blade blade group is arranged on the outer wall of the moving blade inner wheel, the moving blade inner wheel is provided with a center connecting structure, the moving blade inner wheel is fixed to the output shaft of the motor unit through the center connecting structure, the stationary blade wheel comprises a stationary blade inner wheel, a stationary blade outer wheel and a stationary blade blade group, the stationary blade blade group is arranged between the stationary blade inner wheel and the stationary blade outer wheel, the stationary blade inner wheel is in clearance fit with the center connecting structure, the outer wall of the stationary blade outer wheel is limitingly fixed with the inner wall of the upper shell cavity, the air guide blade group, the moving blade blade group and the stationary blade blade group are arranged in sequence.

[0008] Further, the moving blade wheel comprises a moving blade inner wheel and a moving blade blade group, the moving blade blade group is arranged on the outer wall of the moving blade inner wheel, the moving blade inner wheel is provided with a center connecting structure, the moving blade inner wheel is fixed to the output shaft of the motor unit through the center connecting structure, the stationary blade wheel comprises a stationary blade inner wheel, a stationary blade outer wheel and a stationary blade blade group, the stationary blade blade group is arranged between the stationary blade inner wheel and the stationary blade outer wheel, the stationary blade inner wheel is in clearance fit with the center connecting structure, the outer wall of the stationary blade outer wheel is limitingly fixed with the inner wall of the upper shell cavity, the air guide blade group, the moving blade blade group and the stationary blade blade group are arranged in sequence.

[0009] Further, the first moving blade wheel and the first stationary blade wheel, the second moving blade wheel and the second stationary blade wheel, and the third moving blade wheel and the third stationary blade wheel are coaxially arranged in sequence.

[0010] Further, the motor unit comprises a core assembly and a rotating shaft assembly, the core assembly is fixed to the base, the core assembly controls the rotating shaft assembly to rotate, and the moving blade wheel is fixed to the rotating shaft assembly.

[0011] Further, the shell comprises an intermediate connecting plate, the intermediate connecting plate divides the shell into a lower shell cavity and an upper shell cavity, the rotating shaft assembly comprises a rotating shaft, a magnetic ring, a first bearing, a second bearing, a third bearing, a fourth bearing and a pre-press spring, the first bearing, the magnetic ring, the third bearing, the pre-press spring, the fourth bearing and the second bearing are sequentially arranged on the rotating shaft, the first bearing is fixed to the base, the magnetic ring is arranged corresponding to the core assembly, the third bearing and the fourth bearing are respectively arranged at the two ends of the pre-press spring, the pre-press spring is fixed to the intermediate connecting plate through the third bearing and the fourth bearing, and the second bearing is fixed to the most distal end of the stationary blade wheel in the airflow direction.

[0012] Further, the most distal end of the stationary blade wheel is provided with a dust cover, and the dust cover is arranged at a position corresponding to the rotating shaft.

[0013] The second aspect of the present application provides a dust collector comprising a multi-stage impeller assembly as described above.

[0014] Advantages of the present application:

[0015] The present application provides a multi-stage impeller assembly and a dust collector. The multi-stage impeller assembly is driven by a motor unit to rotate. A guide unit and a static blade impeller remain stationary. Air flows through the guide unit and the multi-stage dynamic and static blade unit in sequence along the airflow direction. Each dynamic and static blade unit comprises a dynamic blade impeller and a static blade impeller. The multi-stage dynamic and static blade units are coaxially and sequentially stacked. The multi-stage impeller assembly has the characteristics of large air volume, small size, large power-to-mass ratio, and low wind noise. The multi-stage impeller assembly improves the airflow vacuum degree and the efficiency of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application is further described by the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present application. Other drawings can be obtained by those of ordinary skill in the art without creative labor on the basis of the following drawings.

[0017] Figure 1 is a whole structure semi-sectional view of a multi-stage impeller assembly provided by the present application.

[0018] Figure 2 is a structure semi-sectional view of a multi-stage dynamic and static blade unit in a multi-stage impeller assembly provided by the present application.

[0019] Figure 3 is an assembly structure schematic diagram of a multi-stage dynamic blade impeller in a multi-stage impeller assembly provided by the present application.

[0020] Figure 4 is an assembly structure schematic diagram of a guide unit and a multi-stage static blade impeller in a multi-stage impeller assembly provided by the present application.

[0021] Figure 5 is a structure schematic diagram of an iron core assembly in a multi-stage impeller assembly provided by the present application.

[0022] Figure 6 is a structure schematic diagram of an iron core lamination of an iron core assembly in a multi-stage impeller assembly provided by the present application.

[0023] Figure 7 is a structure schematic diagram of a rotating shaft assembly in a multi-stage impeller assembly provided by the present application.

[0024] Figure 8 is a structure schematic diagram of a base in a multi-stage impeller assembly provided by the present application.

[0025] Figure 9 is a structure schematic diagram of a dustproof cover in a multi-stage impeller assembly provided by the present application. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] Embodiment 1:

[0029] With reference to Figures 1 to 9 , the present embodiment provides a multi-stage impeller assembly, comprising a shell 1, a base 2, a motor unit 3, an air guide unit 4 and at least one stage of moving and stationary blade units, the motor unit 3 is fixed to the base 2, the shell 1 is fixed to the base 2, the moving and stationary blade units include a moving blade impeller and a stationary blade impeller, the moving blade impeller and the stationary blade impeller are coaxially arranged, the moving blade impeller is fixed to the output shaft of the motor unit 3, the motor unit 3 drives the multi-stage moving blade impeller to rotate, when the moving blade impeller rotates, the air guide unit 4 and the stationary blade impeller remain stationary, wherein the outer wall of the stationary blade impeller is limitingly fixed with the inner wall of the shell 1, the outer wall of the air guide unit 4 is limitingly fixed with the inner wall of the shell 1, the inner wall surface of the shell 1 limits the stationary blade impeller and the air guide unit 4 from radial displacement, along the airflow direction, the airflow passes through the air guide unit 4, the moving blade impeller and the stationary blade impeller in sequence, the multi-stage moving and stationary blade units are coaxially arranged in sequence and stacked, and the structure is arranged in series.

[0030] It should be noted that by arranging the multi-stage moving and static blade units in series, when air is sucked from the air inlet, it first passes through the air guide unit 4, and under the action of the air guide unit 4, the inlet airflow is more uniform, the turbulence of the incoming flow is reduced, and the fan efficiency is improved, then the airflow passes through the moving blade impeller, the moving blade impeller does work on the air, the moving blade impeller increases the static pressure and kinetic energy of the airflow, and makes the airflow more deviate from the axial direction; then, the airflow passes through the static blade impeller, the blade shape of the static blade impeller makes the airflow re-deviate in the circumferential direction, and at the same time, the kinetic energy of the airflow is further converted into static pressure, the greater the static pressure, the greater the suction force generated at the air inlet, and through the superposition effect of the multi-stage moving and static blade units, the airflow vacuum degree at the air inlet is greatly increased, without increasing the outer diameter of the impeller and improving the rotating speed of the impeller, the suction force is greatly improved, and the fan can operate efficiently in a large air volume area.

[0031] Referring to Figure 2 and Figure 4 In the embodiment, the air guide unit 4 includes an air guide inner wheel 41, an air guide outer wheel 42, and an air guide blade set 43, the air guide blade set 43 is arranged between the air guide inner wheel 41 and the air guide outer wheel 42, and the space formed between the air guide inner wheel 41 and the air guide outer wheel 42 is a flow channel for airflow, the shell 1 includes a middle connecting plate 13, which extends upward and downward from the outer edge of the middle connecting plate 13 respectively, forming the outer wall surface of the shell 1, the middle connecting plate 13 divides the shell 1 into a lower shell cavity 11 and an upper shell cavity 12, a connecting seat is arranged at the upper shell cavity 12, the air guide inner wheel 41 is fixed to the connecting seat, the outer wall of the air guide outer wheel 42 is limitingly fixed with the inner wall of the upper shell cavity 12, the moving and static blade units are arranged in the upper shell cavity 12, and the motor unit 3 is arranged in the lower shell cavity 11, the lower shell cavity 11 and the upper shell cavity 12 are separated by the middle connecting plate 13 of the shell 1, and in the upper shell cavity 12, a multi-stage air channel is formed.

[0032] Referring to Figures 2 to 4 In the embodiment, the moving blade impeller includes a moving blade inner wheel and a moving blade blade set, the moving blade blade set is arranged on the outer wall of the moving blade inner wheel, the moving blade inner wheel is provided with a center connecting structure 54, the moving blade inner wheel is fixed to the output shaft of the motor unit 3 through the center connecting structure 54, the center connecting structures 54 of the moving blade impellers of the multi-stage moving and static blade units are sequentially abutted, and are synchronously rotated under the driving of the output shaft of the motor unit 3;

[0033] The static blade impeller includes a static blade inner wheel, a static blade outer wheel, and a static blade blade set, the static blade blade set is arranged between the static blade inner wheel and the static blade outer wheel, and the space formed between the static blade inner wheel and the static blade outer wheel is a flow channel for airflow, the static blade inner wheel is in clearance fit with the center connecting structure 54, the outer wall of the static blade outer wheel is limitingly fixed with the inner wall of the upper shell cavity 12, the air guide blade set 43, the moving blade blade set, and the static blade blade set are sequentially and oppositely arranged, and the outer wall of the static blade inner wheel and the outer wall of the moving blade inner wheel are on the same smooth curved surface, and the inner walls of the static blade outer wheels are also on the same smooth curved surface, and the space surrounded by the two smooth curved surfaces is a flow channel for airflow.

[0034] As a preferred mode, the moving and static blade units are three, from bottom to top, the first stage moving and static blade unit 51, the second stage moving and static blade unit 52 and the third stage moving and static blade unit 53, along the airflow direction, the air guide unit 4, the first stage moving and static blade unit 51, the second stage moving and static blade unit 52 and the third stage moving and static blade unit 53 are coaxially sequentially stacked.

[0035] As a preferred mode, the first stage moving and static blade unit 51 includes the first moving blade impeller 511 and the first static blade impeller 512, the second stage moving and static blade unit 52 includes the second moving blade impeller 521 and the second static blade impeller 522, and the third stage moving and static blade unit 53 includes the third moving blade impeller 531 and the third static blade impeller 532, each moving blade impeller includes a corresponding moving blade group, specifically, the first moving blade impeller 511 includes the first moving blade inner wheel 5111 and the first moving blade group 5112, the second moving blade impeller 521 includes the second moving blade inner wheel 5211 and the second moving blade group 5212, and the third moving blade impeller 531 includes the third moving blade inner wheel 5311 and the third moving blade group 5312; each static blade impeller includes a corresponding static blade group, specifically, the first static blade impeller 512 includes the first static blade inner wheel 5121, the first static blade outer wheel 5122 and the first static blade group 5123, the second static blade impeller 522 includes the second static blade inner wheel 5221, the second static blade outer wheel 5222 and the second static blade group 5223, and the third static blade impeller 532 includes the third static blade inner wheel 5321, the third static blade outer wheel 5322 and the third static blade group 5323; the air guide blade group 43, the first moving blade group 5112, the first static blade group 5123, the second moving blade group 5212, the second static blade group 5223, the third moving blade group 5312 and the third static blade group 5323 are coaxially sequentially stacked.

[0036] In addition, the gap between the adjacent two blade groups is 0.1-8mm, since the gap between the static blade group and the moving blade group is a key factor affecting the mutual coordination of the multi-stage moving and static blade unit, when the gap between the adjacent two blade groups is 5mm, the efficiency is the highest.

[0037] Referring to Figures 5 to 7 In this embodiment, the motor unit 3 includes the iron core assembly 31 and the rotating shaft assembly 32, the iron core assembly 31 is fixed to the base 2, the iron core assembly 31 controls the rotating shaft assembly 32 to rotate, and the moving blade impeller is fixed to the rotating shaft assembly 32.

[0038] The iron core assembly 31 includes an insulation layer, a copper wire and an iron core laminate 311, the insulation layer is wrapped outside the iron core laminate 311, and the copper wire is wrapped in the iron core slot and is isolated from the iron core laminate 311.

[0039] The rotating shaft assembly 32 comprises a rotating shaft 321, a magnetic ring 322, a first bearing 323, a second bearing 324, a third bearing 326, a fourth bearing 327 and a pre-press spring 325, the first bearing 323, the magnetic ring 322, the third bearing 326, the pre-press spring 325, the fourth bearing 327 and the second bearing 324 are sequentially sleeved on the rotating shaft 321, the first bearing 323 is fixedly limited on the base 2, the magnetic ring 322 is arranged corresponding to the iron core assembly 31, the third bearing 326 and the fourth bearing 327 are respectively arranged at two ends of the pre-press spring 325, the pre-press spring 325 is fixed to the middle connecting plate 13 through the third bearing 326 and the fourth bearing 327, the second bearing 324 is fixed to the third vane impeller 532 at the farthest end along the air flow direction, under the action of the iron core assembly 31, the magnetic ring 322 is rotated under the action of the magnetic field thereof, and the rotating shaft 321 is driven to rotate, in order to increase the stability of the rotating shaft 321 in the rotating process and improve the rigidity of rotation, four bearings are sequentially arranged on the rotating shaft 321, and the bearings are connected with the base 2, the middle connecting plate 13 and the third vane impeller 532 respectively.

[0040] With reference to Figure 9 As a preferred mode, the shaft end portion of the third vane impeller 532 at the farthest end is provided with a dust cover 6, the dust cover 6 is arranged at a position corresponding to the rotating shaft 321, the dust cover 6 is spaced apart from the end portion of the rotating shaft 321 by a certain gap, so as to prevent dust from entering the interior of the rotating shaft assembly 32.

[0041] Embodiment 2

[0042] The embodiment provides a dust collector, which comprises a multi-stage impeller assembly as described in embodiment 1, and further comprises a driving unit, the driving unit is electrically connected with the motor unit 3, so as to control the start and stop of the motor unit 3 and supply power to the motor unit 3.

[0043] Compared with the prior art, the application provides a multi-stage impeller assembly and a dust collector, the multi-stage moving vane impeller is driven to rotate by the motor unit 3, the air guide unit 4 and the static vane impeller remain stationary, along the air flow direction, air passes through the air guide unit 4 and the multi-stage moving vane unit in sequence, each moving vane unit comprises a moving vane impeller and a static vane impeller, the multi-stage moving vane units are coaxially and sequentially stacked, have the characteristics of large air volume, small size, large power-mass ratio and small wind noise, and improve the air flow vacuum degree and the fan efficiency.

[0044] Finally, it should be emphasized that the application is not limited to the above embodiments, and the above is only a preferred embodiment of the application, and is not intended to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A multi-stage impeller assembly, characterized by, The application relates to a multi-stage dynamic and static blade unit, which comprises a shell, a base, a motor unit, a guide air unit and at least one stage of dynamic and static blade units, the motor unit is fixed to the base, the shell is fixed to the base, the dynamic and static blade unit comprises a dynamic blade impeller and a static blade impeller, the dynamic blade impeller and the static blade impeller are coaxially arranged, the dynamic blade impeller is fixed to the output shaft of the motor unit, the outer wall of the static blade impeller is limitingly fixed to the inner wall of the shell, the outer wall of the guide air unit is limitingly fixed to the inner wall of the shell, along the air flow direction, the air flow sequentially passes through the guide air unit, the dynamic blade impeller and the static blade impeller, and the multi-stage dynamic and static blade units are coaxially arranged in sequence. The guide air unit comprises a guide air inner wheel, a guide air outer wheel and a guide air blade group, the guide air blade group is arranged between the guide air inner wheel and the guide air outer wheel, the shell comprises a lower shell cavity and an upper shell cavity, a connecting seat is arranged at the upper shell cavity, the guide air inner wheel is fixed to the connecting seat, the outer wall of the guide air outer wheel is limitingly fixed to the inner wall of the upper shell cavity, the dynamic and static blade unit is arranged in the upper shell cavity, and the motor unit is arranged in the lower shell cavity. The dynamic blade impeller comprises a dynamic blade inner wheel and a dynamic blade blade group, the dynamic blade blade group is arranged on the outer wall of the dynamic blade inner wheel, the dynamic blade inner wheel is provided with a center connecting structure, the dynamic blade inner wheel is fixed to the output shaft of the motor unit through the center connecting structure, the static blade impeller comprises a static blade inner wheel, a static blade outer wheel and a static blade blade group, the static blade blade group is arranged between the static blade inner wheel and the static blade outer wheel, the static blade inner wheel is in clearance fit with the center connecting structure, the outer wall of the static blade outer wheel is limitingly fixed to the inner wall of the upper shell cavity, and the guide air blade group, the dynamic blade blade group and the static blade blade group are sequentially and oppositely arranged. The dynamic and static blade unit has three stages, namely a first-stage dynamic and static blade unit, a second-stage dynamic and static blade unit and a third-stage dynamic and static blade unit, along the air flow direction, the guide air unit, the first-stage dynamic and static blade unit, the second-stage dynamic and static blade unit and the third-stage dynamic and static blade unit are coaxially arranged in sequence. The first-stage dynamic and static blade unit comprises a first dynamic blade impeller and a first static blade impeller, the second-stage dynamic and static blade unit comprises a second dynamic blade impeller and a second static blade impeller, the third-stage dynamic and static blade unit comprises a third dynamic blade impeller and a third static blade impeller, each stage of the dynamic blade impeller comprises a corresponding dynamic blade blade group, each stage of the static blade impeller comprises a corresponding static blade blade group, and the guide air blade group, the first dynamic blade blade group, the first static blade blade group, the second dynamic blade blade group, the second static blade blade group, the third dynamic blade blade group and the third static blade blade group are coaxially arranged in sequence. The motor unit comprises an iron core assembly and a rotating shaft assembly, the iron core assembly is fixed to the base, the iron core assembly controls the rotating shaft assembly to rotate, and the dynamic blade impeller is fixed to the rotating shaft assembly. The shell comprises an intermediate connecting plate which divides the shell into a lower shell cavity and an upper shell cavity, the rotating shaft assembly comprises a rotating shaft, a magnetic ring, a first bearing, a second bearing, a third bearing, a fourth bearing and a pre-press spring, the first bearing, the magnetic ring, the third bearing, the pre-press spring, the fourth bearing and the second bearing are sequentially sleeved on the rotating shaft, the first bearing is fixed to the base, the magnetic ring is arranged corresponding to the iron core assembly, the third bearing and the fourth bearing are respectively arranged at two ends of the pre-press spring, the pre-press spring is fixed to the intermediate connecting plate through the third bearing and the fourth bearing, and the second bearing is fixed to the stationary vane impeller at the farthest end along the air flow direction.

2. A multiple stage impeller assembly as claimed in claim 1, wherein, The shaft end of the stationary vane impeller at the farthest end is provided with a dust cover, and the dust cover is arranged at a position corresponding to the rotating shaft.

3. A vacuum cleaner characterised in that, A multi-stage impeller assembly comprising a multi-stage impeller assembly according to any one of claims 1 to 2.

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