CN211288241U - Electric fan, air duct system thereof and dust collector - Google Patents

Abstract

The utility model provides an electric fan and duct system and dust catcher thereof. The air duct system includes: a fan housing and a casing. One end of the fan cover is provided with an air inlet. The shell is connected with the other end of the fan cover and encloses an air outlet channel with the fan cover. The inner wall surface of the fan cover comprises a first side wall surface, the inner wall surface of the casing comprises a second side wall surface, the first side wall surface and the second side wall surface form at least one part of the inner side wall of the air channel, and the size of one end, close to the air inlet, of the second side wall surface is larger than or equal to the size of one end, far away from the air inlet, of the first side wall surface. This air duct system improves through the joint part to fan housing and casing for the inside wall in wind channel can not produce the condition that the cross-section sudden change diminishes when passing through to the casing by the fan housing, thereby has weakened the eddy current loss of the structure position of fan housing and casing, has improved air duct system's efficiency, and then has improved electric fan's efficiency and dust catcher's efficiency.

Description

Electric fan, air duct system thereof and dust collector

Technical Field

The utility model relates to an electric fan technical field particularly, relates to an electric fan's air duct system, including this air duct system's electric fan and the dust catcher including this electric fan.

Background

At present, the efficiency of an electric fan which is used as a core functional accessory of a dust collector is greatly influenced by the efficiency of an air duct. The efficiency of the existing air duct system is low, so that the efficiency of the whole electric fan is influenced, and the efficiency of the dust collector is further reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above technical problems, an object of the present invention is to provide an air duct system for an electric fan.

Another object of the utility model is to provide an electric fan including above-mentioned air duct system.

Another object of the present invention is to provide a vacuum cleaner including the above electric blower.

In order to achieve the above object, the present invention provides a wind channel system of an electric fan, including: one end of the fan cover is provided with an air inlet; the shell is connected with the other end of the fan housing and surrounds the fan housing to form an air outlet channel; the inner wall surface of the fan housing comprises a first side wall surface, the inner wall surface of the casing comprises a second side wall surface, the first side wall surface and the second side wall surface form at least one part of the inner wall surface of the air duct, and the size of one end, close to the air inlet, of the second side wall surface is larger than or equal to the size of one end, far away from the air inlet, of the first side wall surface, so that the section of the air duct is kept unchanged or enlarged at the joint of the fan housing and the casing when the fan housing is transited to the casing.

The utility model discloses the wind channel system of electric fan that technical scheme of the first aspect provided improves through the combination position to fan housing and casing for the inside wall in wind channel can not produce the condition that the cross-section sudden change diminishes when passing through to the casing by the fan housing, thereby has weakened the eddy current loss at the structure position of fan housing and casing, has improved wind channel system's efficiency, and then has improved electric fan's efficiency and dust catcher's efficiency.

Specifically, it is found through research that, in the conventional electric fan, the wall thickness of the fan housing is thin and the inner diameter of the fan housing is large, and the wall thickness of the casing is small, so that the section of the air duct is suddenly reduced at the joint of the fan housing and the casing when the fan housing is transited to the casing, the casing can block the air flow to a certain extent, and thus part of the air flow cannot smoothly flow into the casing, and relatively strong eddy current loss is generated at the joint of the fan housing and the casing, thereby reducing the efficiency of the air duct. And the fan housing system that this technical scheme provided, the size that the one end that the second lateral wall of its casing is close to the air intake is greater than or equal to the size that the one end of air intake was kept away from to the first lateral wall of wind channel, therefore at the combination position of fan housing and casing, the cross-section of wind channel keeps unchangeable or can grow when transiting to the casing by the fan housing, the casing can not cause the air current that the fan housing carried to block like this, the air current in having guaranteed the fan housing can smoothly flow into the casing, realize smooth transition, and then can weaken the eddy current loss, thereby improve the efficiency of air duct system, and then improve the efficiency of electric fan, improve the efficiency of dust.

Additionally, the utility model provides an air duct system among the above-mentioned technical scheme can also have following additional technical characteristics:

in the above technical solution, the inner wall surface of the fan housing further includes a first step surface and a third side wall surface, one end of the first step surface is connected to one end of the first side wall surface far away from the air inlet, and the other end of the first step surface extends outward and is connected to one end of the third side wall surface close to the air inlet; the outer wall surface of the shell comprises a first outer side wall, a second step surface and a second outer side wall, one end of the second step surface is connected with one end, far away from the air inlet, of the first outer side wall in a turning mode, and the other end of the second step surface extends outwards and is connected with one end, close to the air inlet, of the second outer side wall in a turning mode; the third side wall surface is sleeved on the outer side of the first outer side wall and is connected with the first outer side wall.

The inner wall surface of the fan cover comprises a first side wall surface, a first step surface and a third side wall surface, the first side wall surface is close to the third side wall surface, so that a first convex edge is formed at one end, close to the shell, of the fan cover, and a step is formed on the inner wall surface of the fan cover. The outer wall surface of the casing comprises a first outer side wall, a second step surface and a second outer side wall, the first outer side wall is arranged outside and inside the second outer side wall, so that a second convex edge is formed at one end, close to the fan cover, of the casing, and a step is formed on the outer wall surface of the casing. Therefore, during assembly, the first convex edge is sleeved on the outer side of the second convex edge, and then the third side wall surface is connected with the first outer side wall, so that the fan cover and the shell can be assembled and fixed. The scheme has the advantages of simple structure, easy processing and forming and convenient assembly. Meanwhile, adverse effects on air flow transition between the fan cover and the shell are avoided. Of course, the positions of the first convex edge and the second convex edge can be exchanged, namely: the first convex edge moves inwards, the second convex edge moves outwards, the second convex edge is sleeved on the outer side of the first convex edge during assembly, and only the air flow of the fan cover can be ensured to smoothly flow into the shell.

In the above technical solution, the third sidewall surface is bonded to the first outer sidewall.

The third side wall surface is bonded and connected with the first outer side wall, for example, the third side wall surface of the fan cover is bonded and fixed with the first outer side wall of the casing in a dispensing or gluing mode, the process is simple, the cost is low, and the fan cover is suitable for popularization. Meanwhile, the mode of bonding connection can play a certain sealing role, and is favorable for preventing air leakage.

In the above technical solution, the first outer side wall is in clearance fit with the third side wall surface.

First lateral wall and third lateral wall surface clearance fit, the first protruding edge of being convenient for is easily established in the outside on the protruding edge of second, therefore is favorable to reducing the assembly degree of difficulty of fan housing and casing, improves assembly efficiency.

In the above technical solution, the first outer side wall and/or the third outer side wall are provided with at least two positioning ribs, and the plurality of positioning ribs are distributed along the circumferential direction of the first outer side wall at intervals.

First lateral wall is equipped with two at least location muscle, perhaps the third lateral wall is equipped with two at least location muscle, perhaps first lateral wall and third lateral wall are equipped with at least one location muscle respectively, the circumference interval distribution of a plurality of location muscle along first lateral wall, can enough reduce the assembly error of fan housing effectively, improve the axiality of fan housing and casing, and then be favorable to reducing the clearance between fan housing and the movable vane wheel, be favorable to improving wind channel efficiency, prevent that fan housing and movable vane wheel from taking place the scraping phenomenon, it assembles badly to improve the production line. In addition, the positioning ribs can also play a role in reinforcing the shell. Furthermore, the positioning ribs are provided with guide inclined planes, so that the fan cover can be conveniently and smoothly assembled in place.

In the above technical solution, for the case that the first outer side wall is provided with the positioning rib, the positioning rib on the first outer side wall is in interference fit with the third side wall surface; and for the situation that the third side wall surface is provided with the positioning rib, the positioning rib on the third side wall surface is in interference fit with the first outer side wall.

And for the condition that the first outer side wall is provided with the positioning rib, the positioning rib on the first outer side wall is in interference fit with the third side wall surface. And for the situation that the third side wall surface is provided with the positioning rib, the positioning rib on the third side wall surface is in interference fit with the first outer side wall. The adoption of the interference fit mode is favorable for further improving the coaxiality of the fan cover and the shell, further reducing the gap between the fan cover and the movable impeller, further improving the air duct efficiency, preventing the fan cover and the movable impeller from scraping and remarkably improving the poor assembly of a production line; and the balance of the stress of the fan cover is facilitated, and the stability and the connection reliability of the fan cover and the shell are improved.

In the above technical solution, the projection of the positioning rib on the second step surface is located in the second step surface.

The projection of location muscle on the second step face is located the second step face, can enough realize the clearance fit of first lateral wall and third lateral wall face, can realize the interference fit of location muscle and third lateral wall face again, still can not lead to the interval before first lateral wall and the third lateral wall face too big simultaneously, and the first lateral wall of being convenient for links to each other through modes such as bonding with the third lateral wall face.

In the above technical solution, the second outer sidewall is flush with the outer sidewall of the wind shield.

The second outer side wall is flush with the outer side wall of the fan cover, so that the outer structure of the air duct system is regular, the air duct system is convenient to machine and form, is also convenient to assemble and is attractive. Simultaneously, compare in fan housing and casing through the circumstances of bending type first protruding edge of formation and the protruding edge of second, this scheme has carried out the attenuate in other words to the tip of fan housing and casing and has formed first protruding edge and the protruding edge of second, and this is favorable to alleviateing air duct system's weight, and then alleviates electric fan's weight, is favorable to realizing the lightweight of dust catcher.

In any one of the above technical solutions, the second side wall surface is provided with a supporting protrusion, and an end surface of the supporting protrusion, which is far away from the air inlet, forms a stator mounting surface.

The second side wall surface is provided with a supporting convex block, the end surface of the supporting convex block, which is far away from the air inlet, forms a stator mounting surface, the axial end surface of the stator is abutted against the stator mounting surface when the electric fan is assembled, the stator is assembled and positioned, and meanwhile, the stator and the stator mounting surface can be fixedly connected by utilizing fasteners such as bolts and the like. In addition, the arrangement of the supporting convex blocks plays a role in strengthening the casing, and the part of the casing connected with the stator is ensured to have higher strength, so that the supporting rigidity of the casing is ensured.

In the above technical solution, the number of the supporting protrusions is at least three, and the plurality of supporting protrusions are distributed at intervals along the circumferential direction of the second sidewall surface.

The quantity of supporting convex block is at least three, and a plurality of supporting convex blocks are favorable to improving the stability of casing along the circumference interval distribution of second lateral wall face, also are favorable to the atress equilibrium between casing and the stator to improve the installation stability of stator.

In the above technical scheme, the supporting convex block includes a pillar and a convex block connected with the pillar, the outer side wall of the pillar is connected with the second side wall surface, the inner wall surface of the pillar is connected with the convex block, the end surface of the convex block close to the air inlet is flush with the pillar, and the end surface of the convex block far away from the air inlet forms the stator mounting surface.

The supporting lug comprises a supporting column and a lug, the outer side wall of the supporting column is connected with the second side wall surface of the casing, the connecting function of the supporting lug and the second side wall surface is achieved, meanwhile, the connecting area is large, the connection is reliable, partial thickening is conducted on the casing, and the supporting rigidity of the casing can be obviously improved. The inner wall surface of the support is connected with the convex block, and the end surface of the convex block close to the air inlet is flush with the support, so that the support convex block integrally forms an L-shaped structure, and the end surface of the convex block far away from the air inlet forms a stator mounting surface for realizing the assembly of the stator.

In the above technical solution, the thickness of the casing is gradually increased from the second step surface to the stator mounting surface; and/or the thickness of the shell is kept unchanged from the stator mounting surface to one end of the shell far away from the fan cover.

The thickness of the shell is gradually increased from the second step surface to the stator mounting surface, so that the thickness of the shell at the stator mounting surface is relatively larger, the strength of the shell is improved, and the reliable support of the shell to the stator is improved.

The thickness of the casing is kept unchanged from the stator mounting surface to one end of the casing far away from the fan cover, so that the casing has relatively high strength, and the structural strength of the air duct system is ensured.

In any of the above technical solutions, in the flow direction of the airflow, the second sidewall surface includes a transition surface and a support surface connected to the transition surface, and from one end of the transition surface away from the support surface to one end of the transition surface close to the support surface, the cross-sectional size of the transition surface gradually decreases, and the cross-sectional size of the support surface remains unchanged.

Along the flowing direction of the air flow, the second side wall surface comprises a transition surface and a supporting surface, and when the air flow flows into the shell from the fan cover, the air flow firstly passes through the transition surface and then passes through the supporting surface. The cross section size of the transition surface is gradually reduced from the end of the transition surface far away from the supporting surface to the end of the transition surface close to the supporting surface, so that the cross section size of the air channel is gradually reduced, the air flow speed is favorably improved, the cross section size of the supporting surface is kept unchanged, and the air flow is favorably and stably flows out. Meanwhile, the casing is generally cylindrical, and the section size of the main body part (namely the second outer side wall) of the outer side wall is kept unchanged, so that the thickness of the combined part of the casing and the fan cover is relatively small, the air flow can smoothly flow into the casing, then the thickness of the part of the casing far away from the fan cover is relatively large along with the smooth transition of the inner wall surface of the casing to the part of the casing far away from the fan cover, the strength of the casing is favorably improved, and the structural strength of the air duct system is ensured.

The utility model discloses technical scheme of second aspect provides an electric fan, include: the air duct system according to any one of the aspects of the first aspect; a stator mounted within the air duct system; and the rotor is arranged in the air duct system and is matched with the stator.

The utility model discloses the electric fan that technical scheme of second aspect provided, because of including any one in the first aspect technical scheme ductwork, therefore have all beneficial effects that any above-mentioned technical scheme had, no longer describe herein.

The utility model discloses the technical scheme of third aspect provides a dust catcher, include: the electric fan according to the technical scheme of the second aspect; the electric fan is arranged on the dust collector main body.

The utility model discloses the dust catcher that technical scheme of third aspect provided, because of including second aspect technical scheme electric fan, therefore have all beneficial effects that any above-mentioned technical scheme had, no longer describe herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic partial cross-sectional structural view of a duct system according to some embodiments of the present invention;

fig. 2 is a schematic perspective view of a fan housing according to some embodiments of the present invention;

fig. 3 is a schematic perspective view of a housing according to some embodiments of the present invention;

FIG. 4 is a schematic perspective view of the enclosure of FIG. 3 from another perspective;

fig. 5 is a schematic block diagram of an electric fan according to some embodiments of the present invention;

fig. 6 is a schematic block diagram of a vacuum cleaner according to some embodiments of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

1 fan housing, 11 air inlets, 12 a first side wall surface, 13 a first step surface, 14 a third side wall surface, 15 a first convex edge, 2 a machine shell, 21 a second side wall surface, 211 a transition surface, 212 a supporting surface, 22 a first outer side wall, 23 a second step surface, 24 a second outer side wall, 25 a positioning rib, 251 a guide inclined surface, 26 a supporting lug, 261 a supporting column, 262 a lug, 263 a stator mounting surface, 27 a second convex edge, 3 a movable impeller, 100 an electric fan, 102 a stator, 104 a rotor, 106 an air duct system, 200 a dust collector and 202 a dust collector main body.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An electric fan, its duct system and a vacuum cleaner according to some embodiments of the present invention will be described with reference to fig. 1 to 6.

Example one

An air duct system for an electric fan comprising: a fan housing 1 and a casing 2.

Specifically, one end of the fan housing 1 is provided with an air inlet 11, as shown in fig. 1 and 2.

And the shell 2 is connected with the other end of the fan housing 1 and surrounds the fan housing 1 to form an air outlet channel.

The inner wall surface of the fan housing 1 includes a first side wall surface 12, and the inner wall surface of the casing 2 includes a second side wall surface 21, as shown in fig. 1. The first side wall 12 and the second side wall 21 form at least a part of an inner side wall of the air duct, and a dimension of an end of the second side wall 21 close to the air inlet 11 is greater than or equal to a dimension of an end of the first side wall 12 away from the air inlet 11, so that a cross section of the air duct remains unchanged or is enlarged when the wind shield 1 transitions from the wind shield 1 to the casing 2 at a joint of the wind shield 1 and the casing 2.

The air duct system of the electric fan provided by the embodiment improves the combining position of the fan cover 1 and the casing 2, so that the condition that the cross section is suddenly reduced can not be generated when the inner side wall of the air duct is transited from the fan cover 1 to the casing 2, the eddy current loss of the structural positions of the fan cover 1 and the casing 2 is weakened, the efficiency of the air duct system is improved, and the efficiency of the electric fan and the efficiency of a dust collector are improved.

Specifically, it is found through research that, in the conventional electric blower, the wall thickness of the fan housing 1 is thin and the inner diameter is large, and the wall thickness of the casing 2 is small, so that the cross section of the air duct is suddenly reduced when the fan housing 1 transits to the casing 2 at the joint portion of the fan housing 1 and the casing 2, the casing 2 may cause a certain block to the air flow, and a part of the air flow may not smoothly flow into the casing 2, and relatively strong eddy current loss may be generated at the joint portion of the fan housing 1 and the casing 2, thereby reducing the efficiency of the air duct.

In the air hood 1 system provided in this embodiment, the dimension of the end of the second side wall 21 of the casing 2 close to the air inlet 11 is greater than or equal to the dimension of the end of the first side wall 12 of the air duct far from the air inlet 11, so that at the joint of the air hood 1 and the casing 2, the cross section of the air duct remains unchanged (as shown in fig. 1) or becomes larger when the air hood 1 transitions to the casing 2, and thus the casing 2 does not block the air flow conveyed by the air hood 1, and it is ensured that the air flow in the air hood 1 can smoothly flow into the casing 2, thereby achieving smooth transition, and further reducing eddy current loss, thereby improving the efficiency of the air duct system, further improving the efficiency of the electric fan, and improving the efficiency of the dust.

Further, the inner wall surface of the fan housing 1 further includes a first step surface 13 and a third side wall surface 14, as shown in fig. 1 and 2. One end of the first step surface 13 is connected to the end of the first side wall 12 far away from the air inlet 11, and the other end of the first step surface 13 extends outwards and is connected to the end of the third side wall 14 near the air inlet 11.

The outer wall surface of the housing 2 includes a first outer side wall 22, a second step surface 23, and a second outer side wall 24, as shown in fig. 1, 3, and 4. One end of the second step surface 23 is connected to the end of the first outer sidewall 22 away from the air inlet 11, and the other end of the second step surface 23 extends outward and is connected to the end of the second outer sidewall 24 close to the air inlet 11.

The third sidewall 14 is disposed outside the first sidewall 22 (as shown in fig. 1), and is connected to the first sidewall 22.

The inner wall surface of the fan housing 1 includes a first side wall surface 12, a first step surface 13 and a third side wall surface 14, the first side wall surface 12 is inward relative to the third side wall surface 14, so that a first protruding edge 15 is formed at one end of the fan housing 1 close to the casing 2, as shown in fig. 2, and a step is formed on the inner wall surface of the fan housing 1. The outer wall surface of the casing 2 comprises a first outer side wall 22, a second step surface 23 and a second outer side wall 24, the first outer side wall 22 is opposite to the second outer side wall 24, so that the casing 2 forms a second convex edge 27 at one end close to the wind shield 1, as shown in fig. 3, and a step is formed on the outer wall surface of the casing 2.

Therefore, during assembly, the first protruding edge 15 is sleeved on the outer side of the second protruding edge 27, and then the third side wall surface 14 is connected with the first outer side wall 22, so that the wind shield 1 and the casing 2 can be assembled and fixed. The scheme has the advantages of simple structure, easy processing and forming and convenient assembly. Meanwhile, the air flow transition between the fan cover 1 and the casing 2 is not adversely affected.

Of course, the positions of the first ledge 15 and the second ledge 27 can also be reversed, namely: the first convex edge 15 is moved inwards, the second convex edge 27 is moved outwards, and the second convex edge 27 is sleeved outside the first convex edge 15 during assembly, so long as the air flow of the fan cover 1 can smoothly flow into the casing 2.

Specifically, the third side wall surface 14 is adhesively connected to the first outer side wall 22.

The third sidewall 14 is bonded to the first outer sidewall 22, for example, the third sidewall 14 of the wind shield 1 is bonded to the first outer sidewall 22 of the casing 2 by dispensing or gluing, which is simple in process, low in cost, and suitable for popularization. Meanwhile, the mode of bonding connection can play a certain sealing role, and is favorable for preventing air leakage.

Of course, the third sidewall surface 14 and the first outer sidewall 22 may be connected together by fasteners, welding, etc.

Further, the first outer side wall 22 is clearance fitted with the third side wall surface 14.

The first outer side wall 22 is in clearance fit with the third side wall surface 14, so that the first convex edge 15 is easily sleeved outside the second convex edge 27, thereby being beneficial to reducing the assembly difficulty of the fan housing 1 and the casing 2 and improving the assembly efficiency.

Example two

On the basis of the first embodiment, further, the first outer side wall 22 is provided with at least two positioning ribs 25, as shown in fig. 3 and 4, a plurality of positioning ribs 25 are distributed at intervals along the circumferential direction of the first outer side wall 22.

First lateral wall 22 is equipped with location muscle 25, and the quantity of location muscle 25 is at least two, and a plurality of location muscle 25 can enough reduce the assembly error of fan housing 1 effectively along the circumference interval distribution of first lateral wall 22, improves the axiality of fan housing 1 and casing 2, and then be favorable to dwindling the clearance between fan housing 1 and the movable impeller 3, be favorable to improving wind channel efficiency, prevent that fan housing 1 and movable impeller 3 from taking place the scraping phenomenon, improve and produce the line assembly badly. In addition, the positioning ribs 25 can also reinforce the housing 2.

Further, the positioning rib 25 is provided with a guide inclined surface 251, which facilitates smooth assembly of the fan housing 1.

Further, the positioning rib 25 is interference-fitted with the third sidewall surface 14, as shown in fig. 1.

The positioning ribs 25 are in interference fit with the third side wall surface 14, so that the coaxiality of the fan cover 1 and the casing 2 is further improved, the gap between the fan cover 1 and the movable impeller 3 is further reduced, the air duct efficiency is further improved, the fan cover 1 and the movable impeller 3 are prevented from being scratched, and poor assembly of a production line is remarkably improved; and is beneficial to the stress balance of the fan housing 1 and the improvement of the stability and the connection reliability of the fan housing 1 and the casing 2.

Of course, the positioning rib 25 and the third sidewall surface 14 may be in clearance fit or transition fit.

Further, the positioning rib 25 is provided with a guiding inclined surface 251, as shown in fig. 1, so that the wind shield 1 can be smoothly assembled in place.

Wherein, the projection of the positioning rib 25 on the second step surface 23 is located in the second step surface 23, as shown in fig. 1.

The projection of the positioning rib 25 on the second step surface 23 is located in the second step surface 23, so that clearance fit between the first outer side wall 22 and the third side wall surface 14 can be realized, interference fit between the positioning rib 25 and the third side wall surface 14 can be realized, excessive distance between the first outer side wall 22 and the third side wall surface 14 cannot be caused, and the first outer side wall 22 and the third side wall surface 14 can be conveniently connected in a bonding mode and the like.

Further, the second outer sidewall 24 is flush with the outer sidewall of the hood 1, as shown in fig. 1.

The second outer side wall 24 is flush with the outer side wall of the fan housing 1, so that the external structure of the air duct system is regular, the air duct system is convenient to machine and form, is also convenient to assemble, and is attractive.

Meanwhile, compared with the case that the fan housing 1 and the case 2 are bent to form the first convex edge 15 and the second convex edge 27, the scheme is equivalent to thinning the end parts of the fan housing 1 and the case 2 to form the first convex edge 15 and the second convex edge 27, so that the weight of the air duct system is favorably reduced, the weight of the electric fan is further reduced, and the light weight of the dust collector is favorably realized.

Of course, the positioning rib may also be disposed on the third side wall surface and in interference fit with the first outer side wall. Or, the positioning ribs are set on the first outer side wall and the third side wall, the positioning rib on the first outer side wall is in interference fit with the third side wall, and the positioning rib on the third side wall is in interference fit with the first outer side wall.

EXAMPLE III

In addition to any of the above embodiments, the second sidewall 21 is further provided with a supporting protrusion 26, as shown in fig. 1. The end surface of the support protrusion 26 facing away from the intake vent 11 forms a stator mounting surface 263, as shown in fig. 1 and 4.

The second side wall surface 21 is provided with a supporting convex block 26, the end surface of the supporting convex block 26 far away from the air inlet 11 forms a stator mounting surface 263, the axial end surface of the stator abuts against the stator mounting surface 263 when the electric fan is assembled, the stator is assembled and positioned, and meanwhile, the stator and the stator mounting surface 263 can be fixedly connected by utilizing fasteners such as bolts and the like. In addition, the arrangement of the supporting projection 26 reinforces the casing 2, and ensures that the part of the casing 2 connected with the stator has higher strength, thereby ensuring the supporting rigidity of the casing 2.

The number of the supporting protrusions 26 is at least three, and a plurality of the supporting protrusions 26 are distributed at intervals along the circumferential direction of the second sidewall surface 21, as shown in fig. 3 and 4.

The number of the supporting convex blocks 26 is at least three, and the plurality of supporting convex blocks 26 are distributed along the circumferential interval of the second side wall surface 21, so that the stability of the machine shell 2 is improved, the stress balance between the machine shell 2 and the stator is also facilitated, and the installation stability of the stator is improved.

Specifically, the support protrusion 26 includes a pillar 261 and a protrusion 262 connected to the pillar 261, as shown in fig. 3 and 4. The outer side wall of the pillar 261 is connected to the second side wall surface 21, the inner wall surface of the pillar 261 is connected to the protrusion 262, the end surface of the protrusion 262 close to the air inlet 11 is flush with the pillar 261, and the end surface of the protrusion 262 far from the air inlet 11 forms a stator mounting surface 263.

Support lug 26 includes pillar 261 and lug 262, and the lateral wall of pillar 261 links to each other with the second lateral wall face 21 of casing 2, realizes support lug 26 and second lateral wall face 21's connection function, and is great because of the connection area simultaneously, connects comparatively reliably, has carried out local thickening to casing 2 in other words, can show the support rigidity that improves casing 2. The inner wall surface of the pillar 261 is connected to the protrusion 262, and the end surface of the protrusion 262 near the air intake opening 11 is flush with the pillar 261, so that the support protrusion 26 is integrally formed into an L-shaped structure, and the end surface of the protrusion 262 far from the air intake opening 11 forms a stator mounting surface 263 for achieving the stator mounting.

Here, the thickness of the housing 2 gradually increases from the second step surface 23 to the stator mounting surface 263, as shown in fig. 1.

From the second step surface 23 to the stator mounting surface 263, the thickness of the casing 2 is gradually increased, so that the thickness of the casing 2 at the stator mounting surface 263 is relatively large, which is beneficial to improving the strength of the casing 2, and thus the reliable support of the casing 2 to the stator is improved.

Further, the thickness of the casing 2 is kept constant from the stator mounting surface 263 to the end of the casing 2 away from the wind shield 1, as shown in fig. 1.

From the stator mounting surface 263 to the end of the casing 2 far away from the fan housing 1, the thickness of the casing 2 is kept unchanged, so that the casing 2 has relatively high strength, and the structural strength of the air duct system is ensured.

Further, in the flowing direction of the airflow, the second sidewall surface 21 includes a transition surface 211 and a support surface 212 connected to the transition surface 211, as shown in fig. 1, 3 and 4, and from an end of the transition surface 211 far from the support surface 212 to an end of the transition surface 211 close to the support surface 212, the cross-sectional size of the transition surface 211 gradually decreases, and the cross-sectional size of the support surface 212 remains unchanged.

Along the flowing direction of the air flow, the second sidewall 21 includes a transition surface 211 and a support surface 212, and the air flow passes through the transition surface 211 and then passes through the support surface 212 when flowing into the casing 2 from the wind shield 1. From the end of the transition surface 211 far away from the support surface 212 to the end of the transition surface 211 close to the support surface 212, the sectional size of the transition surface 211 is gradually reduced, so that the sectional size of the air duct is gradually reduced, which is beneficial to improving the air flow speed, and the sectional size of the support surface 212 is kept unchanged, which is beneficial to the smooth outflow of the air flow.

Meanwhile, because the casing 2 is generally cylindrical, and the section size of the main part of the outer side wall (i.e. the second outer side wall 24) remains unchanged, the design is adopted, so that the thickness of the combined part of the casing 2 and the fan housing 1 is relatively small, the airflow can smoothly flow into the casing 2, then the thickness of the part of the casing 2 far away from the fan housing 1 is relatively large along with the smooth transition of the inner wall surface of the casing 2 to the part of the casing 2 far away from the fan housing 1, the strength of the casing 2 is favorably improved, and the structural strength of the air duct system is ensured.

Example four

An electric fan 100, as shown in fig. 5, comprising: the air duct system 106, the stator 102, and the rotor 104 of any of the above embodiments.

Specifically, the stator 102 is mounted within the air duct system 106; the rotor 104 is mounted within the air duct system 106 and cooperates with the stator 102.

The electric fan 100 provided in this embodiment includes the air duct system 106 according to any one of the above embodiments, so that all the advantages of any one of the above embodiments are provided, and no further description is provided herein.

EXAMPLE five

A vacuum cleaner 200, as shown in fig. 6, comprises the electric fan 100 and the main body 202 of the vacuum cleaner as the above embodiment, wherein the electric fan 100 is arranged on the main body 202 of the vacuum cleaner.

The vacuum cleaner 200 provided in this embodiment includes the electric blower 100 of the above embodiments, so that all the advantages of any of the above embodiments are provided, and no further description is provided herein.

Specifically, the cleaner body 202 is provided with a dust suction port, which communicates with the mouth of the impeller. The cleaner body 202 is also provided with a storage structure for storing dust.

The following description is given with reference to specific examples and is to be compared with the prior art.

At present, an electric fan is used as a core functional accessory of a dust collector, and the efficiency mainly comprises air duct efficiency and motor efficiency. The motor technology is mature, and the efficiency improvement space is limited. Therefore, the efficiency of the electric fan is mainly improved by improving the air duct efficiency, and the air duct system needs to be structurally optimized. Especially, at the joint of the fan housing 1 and the casing 2, the fan housing 1 has a thin wall and a large inner diameter, and the casing 2 needs to have a small wall thickness and a small inner diameter to ensure the structural strength, so that the air duct efficiency can be reduced due to the sudden change of the inner diameter. When the air duct system is designed, the smaller the reduction between the fan cover 1 and the movable impeller 3 is, the higher the air duct efficiency is. However, when the production line is used, the wind shield 1 and the movable impeller 3 are often scraped due to an excessively small design gap, which results in poor mass production.

In order to solve the problem, the utility model provides a ductwork of fan, casing 2 is being close to 1 side inner wall internal diameter of fan housing and is not being less than 1 internal diameter of fan housing, and down the inner wall internal diameter reduces gradually, guarantees that the air current does not pass through the step of internal diameter sudden change. Meanwhile, the stator mounting surface 263 is stressed greatly, and in order to ensure the rigidity of the casing 2, the inner diameter of the inner wall surface of the casing 2 at the stator mounting surface 263 is the smallest, and the wall of the casing 2 is the thickest. The smooth transition of the diameter of the joint of the fan cover 1 and the casing 2 can ensure that the efficiency of the fan is higher, and the thickest wall of the casing 2 at the maximum stress position can ensure the rigidity of the casing 2. The positioning ribs 25 are designed on the matching surface of the fan cover 1 and the casing 2, the fan cover 1 and the positioning ribs 25 can be positioned in an interference manner, partial assembly errors of the fan cover 1 are directly eliminated, and the movable impeller 3 and the fan cover 1 can be ensured not to be scratched in assembly when a gap between the movable impeller 3 and the fan cover 1 is small.

Concretely, the air duct system of the electric fan comprises a casing 2 and an air cover 1. The housing 2 is cylindrical, and the outer wall surface of the cylinder has a first outer wall surface (i.e., a first outer side wall 22) and a second outer wall surface (i.e., a second outer side wall 24), and the diameter of the enveloping circle of the first outer wall surface is smaller than that of the second outer wall surface (i.e., the diameter of the first outer side wall 22 is smaller than that of the second outer side wall 24). The inner wall surface of the housing 2 has at least three inwardly projecting support posts (i.e., support lugs 26) whose end surfaces have stator mounting surfaces 263. The first outer wall of the housing 2 has at least two outwardly projecting ribs 25 formed on its circumference. The fan cover 1 is assembled with the first outer wall surface of the shell 2;

according to the utility model provides a wind channel system, the connection structure design between fan housing 1 and the casing 2 can improve wind channel efficiency, guarantees the support rigidity of casing 2 simultaneously. The positioning ribs 25 on the outer wall of the machine shell 2 can improve the coaxiality of the assembly of the two parts and improve the poor assembly of a production line.

The fan housing 1 and the casing 2 are in clearance fit, and the positioning rib 25 protruding outwards from the fitting surface (i.e. the first outer side wall 22) of the casing 2 is the positioning rib 25 of the fan housing 1, so as to ensure that the coaxiality of the fitting surface is high during clearance assembly. The casing 2 has a thickness larger than that of the fan housing 1 for ensuring the support rigidity, so that the connection between the inner wall surface of the casing 2 and the fan housing 1 adopts smooth transition to avoid fluid eddy loss caused by sudden change of the inner diameter of the air duct, and meanwhile, the casing 2 has the thickest wall at the maximum stress position of the casing 2 to ensure the support rigidity.

Specifically, the first outer wall surface of the housing 2 has at least 2 positioning ribs 25 protruding outward.

The diameter of the enveloping circle of the inner wall surface of the casing 2 close to the fan housing 1 is larger than that of the enveloping circle of the cross section of the stator mounting surface 263. In other words, the diameter of the second sidewall surface 21 of the casing 2 at the end near the air inlet 11 is larger than the inner diameter of the stator mounting surface 263.

The inner wall surface of the fan housing 1 has a first inner wall surface (i.e., the third side wall surface 14) and a second inner wall surface (i.e., the first side wall surface 12), and the first inner wall surface enveloping circle diameter is larger than the second inner wall surface enveloping circle diameter (i.e., the diameter of the first side wall surface 12 is larger than the diameter of the second side wall surface 21).

The diameter of the first inner wall surface enveloping circle of the fan cover 1 is larger than that of the first outer wall surface enveloping circle of the shell 2. In other words, the diameter of the third sidewall 14 of the wind shield 1 is larger than the diameter of the first outer sidewall 22 of the casing 2.

Further, the diameter of the enveloping circle of the first inner wall surface of the fan housing 1 is larger than that of the enveloping circle of the inner wall surface of the shell 2 at the joint. In other words, the diameter of the third sidewall 14 of the fan housing 1 is larger than the diameter of the end of the second sidewall 21 of the casing 2 close to the air inlet 11. With this arrangement, the duct efficiency will be higher.

Alternatively, the diameter of the first inner wall surface enveloping circle of the fan housing 1 may be smaller than the diameter of the inner wall surface enveloping circle of the casing 2 at the connection position. That is, the fan cover 1 is wrapped by the casing 2 at a joint portion between the casing 2 and the fan cover 1.

Further, the diameter of the circle envelope of the positioning rib 25 is smaller than that of the circle envelope of the second outer wall surface of the housing 2, as shown in fig. 1.

Further, the diameter of the enveloping circle of the positioning rib 25 is not less than the diameter of the first inner wall surface of the fan housing 1. Therefore, the positioning ribs 25 are in interference fit with the fan cover 1, and the positioning accuracy of the fan cover 1 is higher. Alternatively, the diameter of the enveloping circle of the positioning rib 25 may be smaller than the diameter of the first inner wall surface of the fan housing 1.

Further, the present invention also provides the following specific examples:

an electric fan comprising the air duct system of any one of the above.

A dust collector comprises the electric fan.

Fig. 1 is a schematic view of the duct system assembly of the present invention. The fan cover 1 is installed above the casing 2, when the fan works, the movable impeller 3 rotates at a high speed, wind is sucked from the air inlet 11 above the fan cover 1, and flows downwards to the casing 2 along the inner wall surface of the fan cover 1 under the diffusion effect of the movable impeller 3 and the fixed impeller. In order to prevent the airflow from flowing through the step with the suddenly changed diameter, the inner diameter of the joint of the fan cover 1 and the casing 2 is in smooth transition. The first inner wall surface of the fan cover 1 and the first outer wall surface of the casing 2 are installation joint surfaces, the assembly mode is clearance fit, and the middle is glued and fastened. In order to ensure the assembly coaxiality of the fan housing 1 and the casing 2, a positioning rib 25 protruding outwards is arranged on the first outer wall surface of the casing 2 to perform interference positioning on the fan housing 1.

In order to improve the assembly coaxiality of the fan cover 1 and the casing 2 and avoid scraping of the movable impeller 3 and the fan cover 1 after installation, the diameter of the enveloping circle of the first inner wall surface of the fan cover 1 is not larger than that of the positioning rib 25, interference assembly is formed, and the assembly error of the fan cover 1 can be effectively reduced. In order to improve the efficiency of the fan, when the wind flows downwards along the inner wall surface of the fan cover 1, the smooth transition of the diameter of the inner wall surface is ensured. As shown in fig. 1, the diameter of the enveloping circle of the second inner wall surface of the fan housing 1 is not larger than the diameter of the enveloping circle of the inner wall surface of the upper end of the casing 2, so that the wind flowing from the fan housing 1 to the casing 2 is ensured to have no step and cause the eddy current loss of the wind. Meanwhile, in order to improve the rigidity of the casing 2, the diameter of the inner wall surface of the casing 2 should be gradually reduced from top to bottom, and the stress at the stator mounting surface 263 is the largest, so the wall of the casing 2 at the stator mounting surface 263 should be the thickest.

Fig. 2 is a schematic structural view of the fan cover 1. The fan housing 1 includes a central air inlet hole (i.e., the air inlet 11), a first inner wall surface (i.e., the third side wall surface 14), and a second inner wall surface (i.e., the first side wall surface 12), and the diameter of the first inner wall surface enveloping circle is larger than that of the second inner wall surface enveloping circle.

Fig. 3 is a schematic structural diagram of the casing 2 of the present invention, the outer wall surface of the casing 2 includes a first outer wall surface (i.e. the first outer side wall 22) and a second outer wall surface (i.e. the second outer side wall 24), there are at least 2 convex positioning ribs 25 on the first outer wall surface, and the diameter of the positioning ribs 25 is smaller than the diameter of the second outer wall surface enveloping circle. The diameter of the enveloping circle above the inner wall surface of the housing 2 is gradually reduced downward in the axial direction until the diameter does not change below the stator mounting surface 263. The design can ensure that the structure with the suddenly-changed diameter can not block the circulation of wind after the fluid flows from the wind cover 1 to the shell 2. Meanwhile, the efficiency is equivalent to that of the thin-wall shell 2, and the rigidity is higher than that of the thin-wall shell 2.

Fig. 4 is a schematic bottom view of the casing 2 in fig. 3, and it can be seen that the stator mounting surface 263 is thinner in the upper casing 2 wall and the stator mounting surface 263 is thicker in the lower casing 2 wall.

It will be appreciated that the top-to-bottom orientation of the drawings is the reverse of the top-to-bottom orientation of the assembled cleaner. Such as: in fig. 1 of the present application, the inlet 11 is directed upward, and after the electric blower is assembled to the cleaner body, the inlet 11 is directed downward.

To sum up, the utility model provides an electric fan and duct system and dust catcher thereof improves through the combination position to fan housing and casing for the inside wall in wind channel can not produce the condition that the cross-section sudden change diminishes when passing through to the casing by the fan housing, thereby has weakened the eddy current loss at the structure position of fan housing and casing, has improved duct system's efficiency, and then has improved electric fan's efficiency and the efficiency of dust catcher.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. An air duct system of an electric fan, comprising:

one end of the fan cover is provided with an air inlet; and

the shell is connected with the other end of the fan housing and surrounds the fan housing to form an air outlet channel;

the inner wall surface of the fan housing comprises a first side wall surface, the inner wall surface of the casing comprises a second side wall surface, the first side wall surface and the second side wall surface form at least one part of the inner wall surface of the air duct, and the size of one end, close to the air inlet, of the second side wall surface is larger than or equal to the size of one end, far away from the air inlet, of the first side wall surface, so that the section of the air duct is kept unchanged or enlarged at the joint of the fan housing and the casing when the fan housing is transited to the casing.

2. The air duct system according to claim 1,

the inner wall surface of the fan cover further comprises a first step surface and a third side wall surface, one end of the first step surface is connected with one end, far away from the air inlet, of the first side wall surface in a turning mode, and the other end of the first step surface extends outwards and is connected with one end, close to the air inlet, of the third side wall surface in a turning mode;

the outer wall surface of the shell comprises a first outer side wall, a second step surface and a second outer side wall, one end of the second step surface is connected with one end, far away from the air inlet, of the first outer side wall in a turning mode, and the other end of the second step surface extends outwards and is connected with one end, close to the air inlet, of the second outer side wall in a turning mode;

the third side wall surface is sleeved on the outer side of the first outer side wall and is connected with the first outer side wall.

3. The air duct system according to claim 2,

the third side wall surface is connected with the first outer side wall in an adhesive mode.

4. The air duct system according to claim 2,

the first outer side wall is in clearance fit with the third side wall surface.

5. The air duct system according to claim 4,

the first outer side wall and/or the third side wall are/is provided with at least two positioning ribs, and the plurality of positioning ribs are distributed at intervals along the circumferential direction of the first outer side wall.

6. The air duct system according to claim 5,

for the situation that the first outer side wall is provided with the positioning rib, the positioning rib on the first outer side wall is in interference fit with the third side wall surface;

and for the situation that the third side wall surface is provided with the positioning rib, the positioning rib on the third side wall surface is in interference fit with the first outer side wall.

7. The air duct system according to claim 5,

and the projection of the positioning rib on the second step surface is positioned in the second step surface.

8. The air duct system according to claim 2,

the second outer side wall is flush with the outer side wall of the fan cover.

9. The air duct system according to any one of claims 1 to 8,

and the second side wall surface is provided with a supporting lug, and the end surface of the supporting lug, which is far away from the air inlet, forms a stator mounting surface.

10. The air duct system according to claim 9,

the number of the supporting convex blocks is at least three, and the supporting convex blocks are distributed at intervals along the circumferential direction of the second side wall surface.

11. The air duct system according to claim 9,

the supporting convex block comprises a supporting column and a convex block connected with the supporting column, the outer side wall of the supporting column is connected with the second side wall surface, the inner wall surface of the supporting column is connected with the convex block, the end surface, close to the air inlet, of the convex block is flush with the supporting column, and the end surface, far away from the air inlet, of the convex block forms the stator mounting surface.

12. The air duct system according to claim 9,

the thickness of the shell is gradually increased from the second step surface to the stator mounting surface; and/or

And the thickness of the shell is kept unchanged from the stator mounting surface to one end of the shell far away from the fan cover.

13. The air duct system according to any one of claims 1 to 8,

along the flowing direction of the air flow, the second side wall surface comprises a transition surface and a supporting surface connected with the transition surface, the cross section size of the transition surface is gradually reduced from one end, far away from the supporting surface, of the transition surface to one end, close to the supporting surface, of the transition surface, and the cross section size of the supporting surface is kept unchanged.

14. An electric fan, comprising:

the air duct system of any one of claims 1-13;

a stator mounted within the air duct system;

and the rotor is arranged in the air duct system and is matched with the stator.

15. A vacuum cleaner, comprising:

the electric fan of claim 14;

the electric fan is arranged on the dust collector main body.

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