CN215949945U - Fan and household appliance - Google Patents

Abstract

The application relates to household electrical appliances technical field discloses a fan, includes: the volute comprises a volute body, a base, an impeller, a volute tongue and a transmission piece, wherein the volute body limits an air outlet channel; the base defines an avoidance slot; the impeller is positioned in the air duct and is rotatably arranged on the base; the volute tongue is positioned in the air duct and positioned on the outer side of the impeller in the circumferential direction, and can move relative to the volute; the transmission piece is positioned in the avoidance groove and is in driving connection with the volute tongue so as to drive the volute tongue to move relative to the volute; the dodging groove is defined on the base, the transmission piece which is connected with the volute tongue in a driving mode is arranged in the dodging groove, the volute tongue is driven to move relative to the volute casing through the transmission piece, the air outlet direction of the fan can be changed through the movement of the volute tongue, the air outlet direction of the fan is made to have various forms, and the air outlet requirement of people is met. The application also discloses a household appliance.

Description

Fan and household appliance

Technical Field

The application relates to the technical field of household appliances, in particular to a fan and a household appliance.

Background

The fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. The fan is widely applied to household appliances due to the characteristics of simple structure, straight generated air flow and the like.

The existing fan mainly guides air outlet through a volute tongue, the air outlet direction is single, and the air blowing requirement of people cannot be met.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a fan and a household appliance, and aims to solve the problem that the air outlet direction of an existing fan is single.

According to a first aspect of embodiments of the present invention, there is provided a fan, including: a volute defining an air outlet channel; a base defining an avoidance slot; the impeller is positioned in the air duct and is rotatably arranged on the base; the volute tongue is positioned in the air duct and positioned on the outer side of the circumferential direction of the impeller, and the volute tongue can move relative to the volute; and the transmission part is positioned in the avoiding groove and is in driving connection with the volute tongue so as to drive the volute tongue to move relative to the volute.

Optionally, the base comprises: and the antifriction component is positioned between the avoiding groove and the transmission part and used for reducing the friction between the transmission part and the avoiding groove.

Optionally, the friction reducing device comprises: the protrusion is arranged on the surface of the avoiding groove facing the transmission piece or on the surface of the avoiding groove facing the transmission piece.

Optionally, the friction reducing device comprises: the groove is arranged on the surface of the avoiding groove facing the transmission piece or on the surface of the transmission piece facing the avoiding groove; and the rolling piece is arranged in the groove.

Optionally, the fan further comprises: and the first driving device is in driving connection with the transmission piece and is used for driving the transmission piece to rotate by taking the axis of the impeller as a rotating shaft.

Optionally, the groove wall of the avoidance groove is provided with a notch, and the first driving device includes: the outer edge of the transmission part is provided with a sawtooth part meshed with the driving wheel, and the driving wheel is meshed with the transmission part through the opening; the first motor is in driving connection with the driving wheel and used for driving the driving wheel to rotate so as to drive the transmission part to rotate.

Optionally, the fan further comprises: the end cover is arranged in the mounting groove and is connected with a first end part of the impeller in the axial direction; and the second driving device is in driving connection with the end cover and is used for driving the end cover to rotate so as to drive the impeller to rotate.

Optionally, the fan further comprises: the guide structure is movably arranged in the cavity and used for changing the air flowing direction in the air duct; the third driving device, the base include with the relative second base that sets up of first base, it dodges the groove including the second, the second dodges the groove and locates the second base, the second base is equipped with the mounting hole, the mounting hole is located the inslot side is dodged to the second, the third driving device passes through the mounting hole with the axial second end drive of water conservancy diversion structure is connected, is used for the drive the water conservancy diversion structure activity.

Optionally, a third axial end of the impeller is rotatably disposed at the second axial end of the flow guide structure; the axial fourth end part of the flow guide structure is movably arranged on the axial first end part of the impeller, so that the impeller and the flow guide structure do not interfere with each other in movement.

According to a second aspect of embodiments of the present invention, there is provided a household appliance comprising the blower fan of any one of the embodiments of the first aspect.

The fan and the household appliance provided by the embodiment of the disclosure can realize the following technical effects:

the dodging groove is defined on the base, the transmission piece which is connected with the volute tongue in a driving mode is arranged in the dodging groove, the volute tongue is driven to move relative to the volute casing through the transmission piece, the air outlet direction of the fan can be changed through the movement of the volute tongue, the air outlet direction of the fan is made to have various forms, and the air outlet requirement of people is met.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic structural diagram of a wind turbine provided in an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a first perspective structure of a wind turbine provided in an embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating a second perspective structure of a wind turbine according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an internal structure of a wind turbine provided in an embodiment of the present disclosure;

FIG. 6 is an exploded view of the internal structure of a wind turbine provided in accordance with an embodiment of the present disclosure;

FIG. 7 is a schematic view of a first view of a fan according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a second view of a fan according to an embodiment of the present disclosure;

fig. 9 is an enlarged view of the region B in fig. 8.

Reference numerals:

1: a volute; 2: a base; 3: an impeller; 4: a cascade of blades; 5: an air duct; 6: an avoidance groove; 7: a volute tongue; 8: a friction reducing member; 9: a transmission member; 10: a first driving device; 11: a driving wheel; 12: a first motor; 13: an end cap; 14: a flow guide structure; 15: a third driving device; 16: opening the gap; 17: a first base; 18: a second base; 19: mounting grooves; 20: a first end portion; 21: a cavity; 22: mounting holes; 23: a second end portion; 24: a third end portion; 25: a fourth end portion; 26: a second driving device; 27: a first avoidance slot; 28: a second avoidance slot; 29: a first transmission member; 30: a second transmission member; 31: a first open end; 32: a second open end; 33: a first side wall; 34: a second side wall; 36: a first flow guide member; 37: a second flow guide member; 38: and a third flow guide member.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

With reference to fig. 1, an embodiment of the present disclosure provides a fan, including: the volute comprises a volute 1, a base 2, an impeller 3, a volute tongue 7 and a transmission piece 9.

The volute 1 defines an air outlet duct 5; the base 2 defines an avoidance slot 6; the impeller 3 is positioned in the air duct 5 and is rotatably arranged on the base 2; the volute tongue 7 is positioned in the air duct 5 and on the outer side of the impeller 3 in the circumferential direction, and the volute tongue 7 can move relative to the volute 1; the transmission piece 9 is positioned in the avoidance groove 6 and is in driving connection with the volute tongue 7 so as to drive the volute tongue 7 to move relative to the volute 1.

Adopt the fan that this disclosed embodiment provided, through set up on base 2 and dodge groove 6, set up the driving medium 9 of being connected with the drive of snail tongue 7 in dodging groove 6, through the activity of driving medium 9 drive snail tongue 7 for spiral case 1, through the activity back of snail tongue 7, can change the air-out direction of fan, make the air-out direction of fan have multiple form, satisfy people's air-out demand.

Alternatively, the shape of the volute 1 may be set according to a specific application scenario, and may be a rectangular parallelepiped shape, a cylindrical shape, but is not limited to these shapes. In the embodiment of the present disclosure, the volute casing 1 is of a three-dimensional structure, the air duct 5 is arranged in the volute casing 1, the shape of the air duct 5 is not unique, and the shape of the air duct 5 can also be set according to actual needs, for example, the air duct 5 can be in a snail shell shape, an arc shape, a straight line shape, and the like.

Alternatively, the base 2 may be a part of the scroll casing 1, or may be provided separately; in the disclosed embodiment, the base 2 includes: a first base 17 and a second base 18, wherein the first base 17 is arranged at one end of the volute 1, and the second base 18 is also arranged at the volute 1 and is opposite to the first base 17. The first base 17 is provided with a first escape groove 27 and the second base 18 is provided with a second escape groove 28. The first avoidance groove 27 and the second avoidance groove 28 may be the same or different in size and shape; in the embodiment of the present disclosure, the first avoiding groove 27 and the second avoiding groove 28 are both annular, and both are equal in size.

Optionally, the impeller 3 is multi-blade, is in a long cylindrical shape, and includes a plurality of blade cascades 4, and the plurality of blade cascades 4 are arranged along the circumferential direction and located in the air duct 5. When the impeller 3 rotates, the airflow enters the impeller 3 from the open part of the impeller 3 (the gap between two adjacent blade grids 4), passes through the inside of the impeller 3, and is discharged from the blade grid 4 on the other surface to form working airflow. The flow condition of the air flow in the impeller 3 is complex, the air flow velocity field is unstable, an eccentric vortex also exists in the impeller 3, and the streamline of the air flow in the impeller 3 is arc-shaped outside the eccentric vortex. Therefore, the flow velocity is not uniform at each point on the outer circumference of the impeller 3, and the velocity is larger as it is closer to the vortex center and smaller as it is closer to the wall of the air duct 5.

The volute tongue 7 generally functions to prevent a part of the air from circulating in the air duct 5. When the impeller 3 is rotated, the air flow at the outlet of the blade cascade 4 sweeps around the volute tongue 7, and the volute tongue 7 divides the air flow into two parts: most of the air flow flows to the outlet of the fan along the space in the volute 1; a small part of airflow flows back into the air duct 5 through a gap between the volute tongue 7 and the impeller 3, and returns to the volute tongue 7 to participate in new flow division after rotating for a circle along with the impeller 3 in the air duct 5.

A transmission part 9 is arranged in the avoiding groove 6, and the shape and the size of the transmission part 9 are matched with those of the avoiding groove 6. The transmission element 9 comprises a first transmission element 29 and a second transmission element 30, wherein the first transmission element 29 is located in the first escape groove 27 and the second transmission element 30 is located in the second escape groove 28.

In some alternative embodiments, friction reducing means 8 are located between the escape groove 6 and the transmission element 9 for reducing friction between the transmission element 9 and the escape groove 6.

Adopt this optional embodiment, antifriction part 8 sets up in dodging between groove 6 and the driving medium 9, and antifriction part 8's mode of setting has multiple form, both can set up on dodging groove 6, also can set up on the driving medium 9, can set up alone again. The antifriction component 8 can make and dodge and have the clearance between 6 bodies in groove and the driving medium 9 body to reduce and dodge the friction between 6 bodies in groove and the driving medium 9 body.

In some alternative embodiments, the friction reducing elements 8 comprise: and the protrusion is arranged on the surface of the avoiding groove 6 facing the transmission piece 9 or on the surface of the transmission piece 9 facing the avoiding groove 6.

With this alternative embodiment, the shape of the protrusion may be convex, or may be hemispherical, semi-ellipsoidal, semi-cylindrical, etc., and any shape that the protrusion can reduce friction between the driving member 9 and the avoiding groove 6 is within the protection scope. The presence of the protrusion may change the surface contact to a line contact or a point contact. Thereby converting sliding friction between the avoiding groove 6 and the transmission piece 9 into rolling friction. In some embodiments, the avoiding groove 6 comprises a first groove wall, a second groove wall and a third groove wall, wherein the first groove wall and the second groove wall are both curved wall, the distance between the first groove wall and the second groove wall is a fixed value, and the third groove wall is a plane wall and intersects with the first groove wall and the second groove wall. The transmission member 9 includes a first surface wall, a second surface wall and a third surface wall corresponding to the first, second and third groove walls, wherein the first surface wall corresponds to the first groove wall, the second surface wall corresponds to the second groove wall, and the third surface wall corresponds to the third groove wall. A bulge is arranged on one of the first groove wall and the first face wall, and a bulge is arranged on one of the second groove wall and the second face wall; a bulge is arranged on one of the third groove wall and the third surface wall.

In some alternative embodiments, the friction reducing elements 8 comprise: the groove is arranged on the surface of the avoiding groove facing the transmission piece or on the surface of the transmission piece facing the avoiding groove; and the rolling piece is arranged in the groove.

By adopting the optional embodiment, the rolling element can be spherical, such as a ball, or cylindrical, and the like, the corresponding groove can be semi-spherical, semi-cylindrical, rectangular, and the like, and it can be understood that when the rolling element is placed in the groove, a part of the rolling element is exposed outside, so that a gap exists between the driving element 9 and the avoiding groove 6, and rolling friction exists between the rolling element and the driving element 9 and between the rolling element and the avoiding groove 6.

Optionally, the grooves include a first groove and a second groove, the first groove is annular, is arranged on the surface of the avoiding groove 6 facing the transmission member 9, and is arranged along the circumferential direction of the avoiding groove 6; the second groove is annular, is arranged on the surface of the transmission piece 9 facing the avoidance groove 6, is arranged along the circumferential direction of the transmission piece 9, and is opposite to the first groove; and the rolling piece is arranged between the first groove and the second groove.

Optionally, the grooves include a first groove and a second groove, the first groove is annular, is arranged on the surface of the avoiding groove 6 facing the transmission member 9, and is arranged along the circumferential direction of the avoiding groove 6; the second groove is annular, is arranged on the surface of the transmission piece 9 facing the avoidance groove 6, is arranged along the circumferential direction of the transmission piece 9, and is staggered with the first groove; the rolling parts are respectively arranged in the first groove and the second groove.

In some optional embodiments, the fan further comprises: and the first driving device 10 is in driving connection with the transmission piece 9, and is used for driving the transmission piece 9 to rotate by taking the axis of the impeller 3 as a rotating shaft.

With this alternative embodiment, the transmission member 9 comprises a first transmission member 29 and a second transmission member 30, the number of the first driving devices 10 being one or two: in the case where the number of the first driving devices 10 is one, the first driving device 10 drives one of the first transmission member 29 and the second transmission member 30; when the number of the first driving devices 10 is two, the first driving device 10 drives the first transmission member 29 and the second transmission member 30.

The first driving device 10 drives the transmission piece 9 to rotate by taking the axis of the impeller 3 as a rotating shaft, the volute tongue 7 connected with the transmission piece 9 also rotates by taking the axis of the impeller 3 as the rotating shaft, the volute tongue 7 is positioned on the outer side of the circumference of the impeller 3, and the rotation of the impeller 3 and the rotation of the volute tongue 7 are not interfered with each other.

The shape of the volute tongue 7 can be triangular, circular arc and the like, and as shown in fig. 1, the volute tongue 7 comprises a first side edge, a second side edge and a third side edge, wherein the first side edge is connected with the second side edge, and a first bevel is formed at the joint of one end of the first side edge and the second side edge; the other end of the first side edge is connected with the third side edge, and a second bevel is formed at the joint of the first side edge and the third side edge; the first break angle is larger than the second break angle. This allows the volute tongue 7 to be located closer to the outer circumferential surface of the impeller 3, thereby directing the air flow direction in the duct 5.

Illustratively, the volute 1 is provided with a first opening end 31 and a second opening end 32, wherein one end of the air duct 5 is communicated with the first opening end 31, the other end is communicated with the second opening end 32, the first opening end 31 faces the horizontal direction, and the second opening end 32 faces downwards. The volute 1 comprises a first side wall 33 and a second side wall 34 which are oppositely arranged, the first side wall 33 is positioned above the second side wall 34, the first side wall 33 is provided with a first fixing position, the second side wall 34 is provided with a second fixing position, wherein the distance between the first fixing position and the first opening end 31 is smaller than the distance between the second fixing position and the first opening end 31, and the distance between the second fixing position and the second opening end 32 is smaller than the distance between the first fixing position and the second opening end 32.

The first fixing position and the second fixing position are located on both sides of the center of the impeller 3 opposite to the straight line on which the perpendicular line of the first side wall 33 is located, or on both sides of the center of the impeller 3 opposite to the straight line on which the perpendicular line of the second side wall 34 is located. The first side wall 33 and the second side wall 34 include both parallel and non-parallel cases, when the first side wall 33 and the second side wall 34 are parallel, a straight line where the center of the impeller 3 and the perpendicular line of the first side wall 33 are located coincides with a straight line where the center of the impeller 3 and the perpendicular line of the second side wall 34 are located, and both the perpendicular lines of the first side wall 33 and the second side wall 34 passing through the center of the impeller 3 can be used as reference lines; however, when the first side wall 33 and the second side wall 34 are not parallel, a straight line where the center of the impeller 3 and the perpendicular line to the first side wall 33 are located does not coincide with a straight line where the center of the impeller 3 and the perpendicular line to the second side wall 34 are located, and two cases occur: the first fixing position and the second fixing position are located on two sides of the center of the impeller 3 opposite to a straight line where the perpendicular line of the first side wall 33 is located, or located on two sides of the center of the impeller 3 opposite to a straight line where the perpendicular line of the second side wall 34 is located, at this time, a side wall with a smaller deflection angle than a reference line when the first side wall 33 and the second side wall 34 are parallel is selected as a reference side wall, and a perpendicular line of the reference side wall passing through the center of the impeller 3 is selected as a reference line.

Optionally, when the first side wall 33 and the second side wall 34 are parallel, and the volute tongue 7 is located at the first fixing position, the second side edge of the volute tongue 7 is parallel to the reference line, and an included angle between an extension line of the third side edge of the volute tongue 7 and an extension line of the second side edge is about 30 degrees. The volute tongue 7 at the first fixing position rotates around the impeller 3 by about 180 degrees in the circumferential direction, and the volute tongue 7 is at the second fixing position, it can be understood that the rotation angle of the volute tongue 7 around the impeller 3 is not strictly 180 degrees, the front edge of the volute tongue 7 at the first fixing position and the front edge of the volute tongue 7 at the second fixing position are respectively connected by taking the center of the impeller 3 as the center, and the angle of the two connecting lines is 150 degrees to 210 degrees.

Therefore, the volute tongue 7 can move in an angle range close to a semicircle at one side of the circumference of the impeller 3, the angle of wind direction adjustment can be met at the first fixing position and the second fixing position of the volute tongue 7, wind generated by the fan is more stable, and a better wind conveying effect is achieved.

When the impeller 3 starts to work, the airflow in the air duct 5 is driven to flow, the rotation of the impeller 3 provides power for the flow of the air in the air duct 5, the airflow generates a vortex at the center position of the impeller 3, and as shown in fig. 1, the arrow in fig. 1 points to the air flow direction, when the volute tongue 7 is at the first fixed position, the volute tongue 7 cooperates with the second side wall 34 to influence the flow of the airflow, so that the vortex is an eccentric vortex, the center of the eccentric vortex moves to the vicinity of the first fixed position, and the eccentric vortex drives the airflow to flow out from the first open end 31, so that when the first open end 31 is an air outlet, the second open end 32 is correspondingly an air inlet; when the volute tongue 7 is at the second fixed position, the volute tongue 7 is matched with the first side wall 33 to influence the flow of the airflow, so that the vortex is an eccentric vortex, the center of the eccentric vortex moves to the vicinity of the second fixed position, and the eccentric vortex drives the airflow to flow out from the second open end 32, so that when the first open end 31 is an air inlet, the second open end 32 is correspondingly an air outlet; thereby changing the flow direction of the air in the wind tunnel 5.

In some alternative embodiments, the groove wall of the bypass groove 6 is provided with a notch 16, and the first driving device 10 comprises: the driving wheel 11 and the first motor 12, the outer edge of the driving member 9 has a sawtooth part engaged with the driving wheel 11, the driving wheel 11 is engaged with the driving member 9 through a gap 16; the first motor 12 is in driving connection with the driving wheel 11 and is used for driving the driving wheel 11 to rotate so as to drive the transmission member 9 to rotate.

By adopting the alternative embodiment, the driving wheel 11 is a gear, and the notch 16 is arranged on the groove wall of the avoiding groove 6, and the gear is meshed with the transmission part 9 through the notch 16, so that the structure of the device is more compact, and the rotation of the driving wheel and the rotation of the impeller 3 are not interfered with each other.

Alternatively, the driving wheel 11 and the transmission member 9 may be driven by a belt or a chain.

In some optional embodiments, the fan further comprises: the end cover 13 and the second driving device 26, the base 2 comprises a first base 17, the avoiding groove 6 comprises a first avoiding groove 27, the first avoiding groove 27 is arranged on the first base 17, the first base 17 is provided with a mounting groove 19, the mounting groove 19 is positioned at the inner side of the first avoiding groove 27, and the end cover 13 is arranged in the mounting groove 19 and connected with the first end part 20 of the impeller 3 in the axial direction; and the second driving device 26 is in driving connection with the end cover 13 and is used for driving the end cover 13 to rotate so as to drive the impeller 3 to rotate.

With this alternative embodiment, the first base 17 is provided with a mounting groove 19 and a first avoiding groove 27, and a first transmission member 29 is arranged in the first avoiding groove 27 and is used for driving the volute tongue 7 to rotate; the mounting groove 19 is located inside the first avoiding groove 27, optionally, the mounting groove 19 is circular, the center of the mounting groove 19 is the same as that of the first avoiding groove 27, the end cover 13 is arranged in the mounting groove 19, the end cover 13 is in driving connection with the second driving device 26, the second driving device 26 drives the end cover 13 to rotate, and then the end cover 13 drives the impeller 3 to rotate, so that the rotation of the impeller 3 and the volute tongue 7 is not interfered with each other, and the structure of the fan is more compact. Alternatively, the end cover 13 is shaped like a flat cylinder with a hollow inside, one end of the end cover 13 and the first end 20 of the impeller 3 are fixed together by means of screws, bolts, rivets, ultrasonic welding, etc., and the other end of the end cover 13 is drivingly connected to the second driving device 26. Optionally, the third end 24 of the impeller 3 is rotatably provided to the second chassis 18. Specifically, the third end 24 of the impeller 3 is provided with a rotating shaft, and the rotating shaft is fixedly arranged on the second base 18 through a bearing.

In some optional embodiments, the fan further comprises: the guide structure 14 and the third driving device 15, the inside of the impeller 3 is provided with a cavity 21, and the guide structure 14 is movably arranged in the cavity 21 and used for changing the air flowing direction in the air duct 5; the base 2 comprises a second base 18 opposite to the first base 17, the avoiding groove 6 comprises a second avoiding groove 28, the second avoiding groove 28 is formed in the second base 18, the second base 18 is provided with a mounting hole 22, the mounting hole 22 is located on the inner side of the second avoiding groove 28, and the third driving device 15 is in driving connection with the axial second end portion 23 of the diversion structure 14 through the mounting hole 22 and used for driving the diversion structure 14 to move.

With this alternative embodiment, the air guiding structure 14 is movable relative to the cavity 21 between a first air guiding position and a second air guiding position, in which the air flow direction in the air duct 5 is different; the flow guide structure 14 comprises a first flow guide part 36 and a second flow guide part 37, the first flow guide part 36 and the second flow guide part 37 are sequentially arranged from the edge of the impeller 3 to the center of the impeller 3, the first flow guide part 36 is arranged close to the inner edge of the impeller 3, the cross section of the first flow guide part 36 is oval, the arc part and the tip part are opposite in position, the tip part is closer to an air inlet of the first air duct 5 compared with the arc part, the arc part is positioned on the windward side, the tip part is positioned on the air supply side, airflow flows to the tip part from the arc part of the first flow guide part 36 after entering the cavity 21, an eccentric vortex is formed at the first flow guide part 36, and the received windage resistance is small. The head thickness of the first flow guide part 36 is larger than that of the second flow guide part 37, a first flow passage is defined between the first flow guide part 36 and the second flow guide part 37, and the curvature of the surface of the first flow guide part 36 facing the second flow guide part 37 is larger than that of the surface of the second flow guide part 37 facing the first flow guide part 36; when the airflow passes through the cavity 21, eccentric vortex is generated at the first flow guide member 36, so that the flow direction of the airflow is changed.

Optionally, the flow guiding structure 14 further includes a third flow guiding element 38, the third flow guiding element 38 is sequentially disposed along a direction of the second flow guiding element 37 away from the first flow guiding element 36, the third flow guiding element 38 includes a plurality of flow guiding elements, a second flow channel is formed between two adjacent flow guiding elements, and a curvature of the first flow channel is smaller than a curvature of the second flow channel.

As shown in fig. 2, when the air guiding structure is in the first air guiding position, a distance between the first air guiding member 36 and the first side wall 33 is smaller than a distance between the first air guiding member 36 and the second side wall 34, and an air flow in the air duct 5 flows as indicated by an arrow in fig. 2; the air guide structure 14 is located at the second air guide position, at this time, a distance between the first air guide member 36 and the first side wall 33 is greater than a distance between the first air guide member 36 and the second side wall 34, at this time, an airflow in the air duct 5 flows from the first open end 31 toward the second open end 32, the first open end 31 is an air inlet, the second open end 32 is an air outlet, and when the air guide structure 14 is located at the first air guide position and the second air guide position, a flow direction of the air in the air duct 5 is opposite.

In some alternative embodiments, as shown in fig. 6, the third axial end 24 of the impeller 3 is rotatably disposed at the second axial end 23 of the flow guiding structure 14; the axial fourth end 25 of the flow guiding structure 14 is movably disposed at the axial first end 20 of the impeller 3, so that the movement of the impeller 3 and the flow guiding structure 14 are not interfered with each other.

With this alternative embodiment, the impeller 3 includes axially opposed first and third ends 20, 24 and the flow directing structure 14 includes axially opposed second and fourth ends 23, 25. The first end part 20 is directly in driving connection with the second driving device 26 through a connecting shaft, or the first end part 20 is indirectly in driving connection with the second driving device 26 through the end cover 13; the fourth end 25 of the flow guiding structure 14 is movably connected with the first end 20 of the impeller 3, and optionally, the fourth end 25 of the flow guiding structure 14 is rotatably connected with the first end 20 of the impeller 3 through a bearing. The second end 23 of the flow guiding structure 14 is drivingly connected to the third driving device 15, and the center of the third end 24 of the impeller 3 is provided with a through hole, the through hole passes through the second end 23 of the flow guiding structure 14, and optionally, the center of the third end 24 of the impeller 3 is connected to the second end 23 of the flow guiding structure 14 through a bearing, so that the rotation of the impeller 3 and the rotation of the flow guiding structure 14 do not interfere with each other. The second base 2 is provided with a second avoiding groove, a through hole is formed in the center of the inner side of the second avoiding groove, the third driving device is in driving connection with the second end portion 23 of the flow guide structure 14 through the through hole, and the rotation of the flow guide structure 14 and the rotation of the transmission piece 9 do not interfere with each other. Namely, the movements of the impeller 3, the flow guiding structure 14 and the transmission piece 9 are not interfered with each other.

Alternatively, the third driving device 15 may be a stepping motor, a servo motor, a torque motor, and the like, and preferably, the third driving device 15 employs a stepping motor, which has the following advantages: easy to be controlled, the precision is high, do not accumulate positioning error, have splendid low rotational speed/high moment characteristic, do not need gear reduction, and step motor is in steady position, can not overheated holding load, conveniently controls the position of water conservancy diversion structure 14, and then is favorable to adjusting the air flow direction in wind channel 5.

According to a second aspect of embodiments of the present invention, there is provided a household appliance comprising the blower fan of any one of the embodiments of the first aspect. Since the household appliance includes any one of the fans in the embodiments of the first aspect, all the advantages of any one of the fans in the embodiments of the first aspect are achieved, and details are not repeated here.

Household appliances include, but are not limited to, air conditioners, ductors, range hoods, ovens, air purifiers, and the like.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A fan, comprising:

a volute (1) defining an air duct (5);

a base (2) defining an avoidance slot (6);

the impeller (3) is positioned in the air duct (5) and is rotatably arranged on the base (2);

the volute tongue (7) is positioned in the air duct (5) and positioned on the outer side of the periphery of the impeller (3), and the volute tongue (7) can move relative to the volute (1);

the transmission piece (9) is positioned in the avoiding groove (6) and is in driving connection with the volute tongue (7) so as to drive the volute tongue (7) to move relative to the volute casing (1).

2. The fan according to claim 1, characterized in that the base (2) comprises:

antifriction part (8), be located dodge groove (6) with between driving medium (9), be used for reducing driving medium (9) with dodge the friction between groove (6).

3. The fan according to claim 2, wherein the friction reducing means (8) comprises:

the protrusion is arranged on the surface of the avoiding groove (6) facing the transmission piece (9) or on the surface of the transmission piece (9) facing the avoiding groove (6).

4. The fan according to claim 2, wherein the friction reducing means (8) comprises:

the groove is arranged on the surface, facing the transmission piece (9), of the avoidance groove (6) or on the surface, facing the avoidance groove (6), of the transmission piece (9);

and the rolling piece is arranged in the groove.

5. The fan of claim 1, further comprising:

the first driving device (10) is in driving connection with the transmission piece (9) and is used for driving the transmission piece (9) to rotate by taking the axis of the impeller (3) as a rotating shaft.

6. The fan according to claim 5, characterized in that the wall of the avoiding groove (6) is provided with a notch (16), the first driving means (10) comprising:

the outer edge of the transmission part (9) is provided with a sawtooth part meshed with the driving wheel (11), and the driving wheel (11) is meshed with the transmission part (9) through the notch (16);

the first motor (12) is in driving connection with the driving wheel (11) and is used for driving the driving wheel (11) to rotate so as to drive the transmission piece (9) to rotate.

7. The fan of claim 1, further comprising:

the end cover (13), the base (2) comprises a first base (17), the avoidance groove (6) comprises a first avoidance groove (27), the first avoidance groove (27) is formed in the first base (17), the first base (17) is provided with a mounting groove (19), the mounting groove (19) is located on the inner side of the first avoidance groove (27), and the end cover (13) is arranged in the mounting groove (19) and connected with a first axial end (20) of the impeller (3);

and the second driving device (26) is in driving connection with the end cover (13) and is used for driving the end cover (13) to rotate so as to drive the impeller (3) to rotate.

8. The fan of claim 7, further comprising:

the impeller (3) is internally provided with a cavity (21), and the flow guide structure (14) is movably arranged in the cavity (21) and used for changing the air flowing direction in the air duct (5);

third drive arrangement (15), base (2) include with second base (18) that first base (17) set up relatively, dodge groove (6) including the second and dodge groove (28), the second dodge groove (28) and locate second base (18), second base (18) are equipped with mounting hole (22), mounting hole (22) are located the second dodges groove (28) inboard, third drive arrangement (15) pass through mounting hole (22) with water conservancy diversion structure (14) axial second tip (23) drive is connected, is used for driving water conservancy diversion structure (14) activity.

9. The fan according to claim 8, characterized in that a third axial end (24) of the impeller (3) is rotatably arranged at the second axial end (23) of the flow guiding structure (14); the axial fourth end (25) of the flow guide structure (14) is movably arranged at the axial first end (20) of the impeller (3), so that the movement of the impeller (3) and the movement of the flow guide structure (14) are not interfered with each other.

10. A household appliance, characterized in that it comprises a fan according to any one of claims 1 to 9.

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