CN115707871A - Fan and household appliance - Google Patents

Abstract

The application relates to domestic appliance technical field discloses a fan, the fan includes: a volute; the impeller is rotatably arranged in the volute and limits an inner space; the volute tongues are arranged at intervals along the outer side of the impeller, the volute tongues are provided with channels, two ends of each channel are communicated with the inner space, and the channels can be opened and closed. By adopting the alternative embodiment, when the impeller rotates, the volute tongue and the volute casing are interacted, the windward pressure of the volute tongue is higher, the leeward pressure is lower, and the windward side and the leeward side have pressure difference. The two ends of the channel are communicated with the inner space of the impeller, when the channel of the volute tongue is opened, due to the existence of pressure difference, an eccentric vortex is formed at the volute tongue by airflow, the diversion of the airflow is realized, the position formed by the eccentric vortex is changed by changing the opened channel, so that the circulation direction of the airflow is changed, and the air outlet in different directions is realized. The application also discloses a household appliance.

Description

Fan and household appliance

Technical Field

The application relates to the technical field of household appliances, for example 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.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the fans in the prior art can only supply air from one fixed air port and supply air from the other air port, so that the fans have limitations in the actual application process and cannot be applied to places needing to realize air supply in different directions.

Disclosure of Invention

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, so as to solve the problem of how to realize air outlet of the fan in different directions.

According to a first aspect of the present application, there is provided a fan comprising: a volute; the impeller is rotatably arranged in the volute and limits an inner space; the volute tongues are arranged at intervals along the outer side of the impeller and provided with channels, two ends of each channel are communicated with the inner space, and the channels can be opened and closed.

Optionally, the volute includes a first side wall and a second side wall disposed opposite to each other, and the plurality of volute tongues includes: the first volute tongue is arranged on the first side wall; and the second volute tongue is arranged on the second side wall, wherein one of the channel of the first volute tongue and the channel of the second volute tongue is opened.

Optionally, the first volute tongue and the second volute tongue are located on two opposite sides of a straight line where the center of the impeller and the perpendicular line of the first side wall are located, or located on two opposite sides of a straight line where the center of the impeller and the perpendicular line of the second side wall are located.

Optionally, the volute tongue comprises: the impeller comprises a plurality of blades, wherein the blades are sequentially arranged at intervals in the direction away from the impeller, and a gap between every two adjacent blades forms a channel.

Optionally, the gap between two adjacent blades is 3 mm to 5 mm.

Optionally, the volute tongue further comprises: a first vane plate; and one end of the second blade plate is connected with one end of the first blade plate, a folded angle is formed at the connection part, and the opening of the folded angle faces the impeller.

Optionally, the volute tongue further comprises: the volute tongue is positioned between the blade and the impeller, a gap is reserved between the volute tongue and the impeller, and the volute tongue faces towards the side of the impeller and is a smooth curved surface.

Optionally, the fan further comprises: the volute tongue opening and closing devices are the same in number and correspond to the volute tongues in one-to-one mode, are arranged at the channel and are used for opening or closing the channel.

According to a second aspect of the present application, there is provided a household appliance comprising the fan.

Optionally, the household appliance comprises an air conditioner, the volute is provided with a first air opening and a second air opening, the opening of the first air opening faces upwards along the horizontal direction, and the opening of the second air opening faces downwards;

the first side wall is positioned above the second side wall, and when the channel of the first vortex tongue is opened, air enters from the second air opening and flows out from the first air opening; when the channel of the second volute tongue is opened, air enters from the first air port and flows out from the second air port.

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

when the impeller rotates, the volute tongue and the volute casing interact, the windward pressure of the volute tongue is higher, the leeward pressure is lower, and the windward side and the leeward side have pressure difference. The both ends of passageway all are linked together with the inner space of impeller, and when the passageway of a snail tongue was opened, because the existence of pressure differential, the air current flowed to the leeward side by the windward side flow direction of snail tongue through the passageway to form eccentric vortex in this snail tongue department, realize the water conservancy diversion to the air current, through changing the passageway of opening, change the position that eccentric vortex formed, thereby change the circulation direction of air current, realize the air-out of equidirectional.

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 cross-sectional structural diagram of a blower and a household appliance provided in an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a blower and a household appliance provided in the embodiment of the present disclosure.

Reference numerals:

10. a volute; 11. a first side wall; 110. a first position; 111. a first tuyere; 12. a second side wall; 120. a second position; 121. a second tuyere; 20. an impeller; 21. an interior space; 30. a volute tongue; 301. a first volute tongue; 302. a second volute tongue; 31. a channel; 311. a channel of the first volute tongue; 312. a channel of the second volute tongue; 32. a blade; 321. a first vane plate; 322. a second blade plate; 33. a snail tongue; 40. a volute tongue opening and closing device; 41. a motor; 42. a gear; 43. a rack; 44. and a baffle plate.

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 claims of the embodiments of the disclosure and in the drawings described above 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 as appropriate for the embodiments of the disclosure described herein. 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, terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on 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.

Fig. 1 and 2 show alternative embodiments of the fan, the direction of the arrows in fig. 1 being the air flow direction.

The embodiment discloses a fan, including spiral case 10, impeller 20 and volute tongue 30, impeller 20 rotationally locates in the spiral case 10, and impeller 20 limits inner space 21, and the quantity of volute tongue 30 is a plurality of, and a plurality of volute tongues 30 set up along impeller 20 outside interval, and volute tongue 30 is equipped with passageway 31, and the both ends of passageway 31 all are linked together with inner space 21, and passageway 31 openable sets up.

With this alternative embodiment, when the impeller 20 rotates, the volute tongue 30 and the volute casing 10 interact, the windward pressure of the volute tongue 30 is higher, the leeward pressure is lower, and there is a pressure difference between the windward side and the leeward side. The two ends of the channel 31 are both communicated with the inner space 21 of the impeller 20, when the channel 31 of the volute tongue 30 is opened, due to the existence of pressure difference, airflow flows from the windward side to the leeward side of the volute tongue 30 through the channel 31, so that an eccentric vortex is formed at the volute tongue 30, the airflow is guided, the position where the eccentric vortex is formed is changed by changing the opened channel 31, the flowing direction of the airflow is changed, the air outlet in different directions is realized, and the wind resistance and the noise of the fan are reduced.

The impeller 20 is a multi-blade type, and includes a plurality of blade cascades arranged along the circumferential direction, and the impeller 20 is cylindrical and disposed in the volute 10. A corresponding drive motor is arranged in the volute 10, and the impeller 20 is driven by the drive motor to rotate in the volute 10. The impeller 20 may also be rotated relative to the volute 10 by other means, may be belt driven, may be gear driven, etc., and it will be understood that any means of driving the impeller 20 to rotate relative to the volute 10 is an alternative to the present application.

When the impeller 20 rotates, the airflow enters the impeller 20 from the open part of the impeller 20 (the gap between two adjacent blade rows), and is discharged from the other blade row to form a working airflow. The flow of the air flow in the impeller 20 is complicated, the velocity field of the air flow is unstable, and an eccentric vortex is also present in the impeller 20 and is centered near the volute tongue 30. The existence of the eccentric vortex generates a circulating flow at the output end of the impeller 20, and outside the eccentric vortex, an airflow streamline in the impeller 20 is in a circular arc shape. Therefore, the flow velocity is not uniform at each point on the outer circumference of the impeller 20, and the velocity is larger as it is closer to the vortex center and smaller as it is closer to the volute 10.

The volute tongue 30 generally functions to prevent a portion of the gas from circulating within the volute 10. When the air flow at the outlet of the cascade of the rotating impeller 20 sweeps around the volute tongue 30, the tongue of the volute tongue 30 divides them into two parts: most of the air flow flows to the outlet of the fan along the space in the volute 10; a small part of the airflow flows back to the volute casing 10 through the gap between the volute tongue 30 and the impeller 20, and then returns to the volute tongue 30 to participate in new flow division after rotating for one circle along with the impeller 20 in the volute casing 10.

The volute tongue 30 of the present embodiment is provided with the openable channel 31, when the channel 31 of one volute tongue 30 is opened, due to the existence of pressure difference, the eccentric vortex is stabilized at the volute tongue 30, and most of the air flow flows to the air port corresponding to the volute tongue 30 along the space in the volute casing 10; a small part of the airflow flows back to the volute 10 and the inner space 21 through the volute tongue 30, the gap between the impellers 20 and the channel 31, and returns to the volute tongue 30 to participate in new flow division after rotating with the impeller 20 for one circle in the volute 10.

By adopting the optional embodiment, on one hand, the eccentric vortex can be stabilized at the volute tongue 30, the air output of the fan is increased, and the performance of the fan is improved; on the other hand, the channel 31 of the volute tongue 30 can be opened alternatively according to different requirements, and the air outlet direction of the fan is changed.

In some optional embodiments, the volute 10 includes a first side wall 11 and a second side wall 12 disposed opposite to each other, the first side wall 11 is disposed at the first position 110, the second side wall 12 is disposed at the second position 120, the plurality of tongues 30 includes a first tongue 301 and a second tongue 302, the first tongue 301 is disposed at the first position 110, the second tongue 302 is disposed at the second position 120, and the first tongue passage 311 and the second tongue passage 312 are alternatively opened.

The scroll casing 10 is provided with a first tuyere 111 and a second tuyere 121, a distance between the first tuyere 111 and the first position 110 is smaller than a distance between the first tuyere 111 and the second position 120, and a distance between the second tuyere 121 and the second position 120 is smaller than a distance between the second tuyere 121 and the first position 110. When the channel 311 of the first volute tongue is opened and the channel 312 of the second volute tongue is closed, the airflow forms an eccentric vortex at the first volute tongue 301, the eccentric vortex drives the gas to flow out from the first air port 111, at this time, the first air port 111 is an air outlet, and the second air port 121 is an air inlet; as shown in fig. 1, when the channel 311 of the first volute tongue is closed and the channel 312 of the second volute tongue is opened, the airflow forms an eccentric vortex at the second volute tongue 302, and the eccentric vortex drives the air to flow out from the second air opening 121, at this time, the first air opening 111 is an air inlet, and the second air opening 121 is an air outlet; the working state of the first volute tongue 301 and the second volute tongue 302 is changed, so that the flowing direction of the airflow is changed.

Optionally, the blower is arranged in the air conditioner, the volute 10 is provided with a first air opening 111 and a second air opening 121, the opening of the first air opening 111 faces upwards along the horizontal direction or the opening of the first air opening is facing downwards, and the opening of the second air opening 121 faces downwards; wherein, the first side wall 11 is located above the second side wall 12, and when the channel 31 of the first vortex tongue is opened, air enters from the second air opening 121 and flows out from the first air opening 111; when the channel 312 of the second volute tongue is opened, air enters from the first air port 111 and flows out from the second air port 121.

As shown in fig. 1, the horizontal air outlet is a first air outlet 111, the downward air outlet is a second air outlet 121, and when the air conditioner needs to heat, a user wants to realize carpet air supply, because during carpet air supply, the density of hot air is low relative to cold air, and hot air blown to the ground continuously floats upwards, so that the temperature of a room is quickly raised, but hot air is not directly blown to the upper part of the room, so that hot air is gathered at the upper part and is difficult to sink, and an uncomfortable feeling of head and foot warming occurs, at this time, the controller controls the driving mechanism at the first worm tongue 301 to drive the baffle 44 at the first worm tongue 301 to move towards the impeller 20, so as to close the channel 311 of the first worm tongue, and the driving mechanism at the second worm tongue 302 drives the baffle 44 at the second worm tongue 302 to move away from the impeller 20, so as to open the channel 312 of the second worm tongue, so that an eccentric vortex is formed at the second worm tongue 302, and drives air to flow out from the second air outlet 121, and the first air outlet 111 is an air inlet, thereby realizing carpet air supply.

When the air conditioner needs to refrigerate, a user wants cold air to blow to the upper part of a room to realize bath type air supply, and the cold air blowing to the upper part of the room sinks continuously to quickly reduce the temperature of the room instead of directly blowing the cold air to the ground, so that the cold air is collected at the lower part of the room to cause the phenomenon of cold head heat of feet, and discomfort caused by direct blowing, at the moment, the controller controls the driving mechanism at the first volute tongue 301 to drive the baffle 44 at the first volute tongue 301 to move away from the impeller 20 to open the channel 311 of the first volute tongue, and the driving mechanism at the second volute tongue 302 drives the baffle 44 at the second volute tongue 302 to move towards the impeller 20 to close the channel 312 of the second volute tongue so that an eccentric vortex is formed at the first volute tongue 301 to drive air to flow out from the first air port 111, the first air port 111 is an air outlet, and the second air port 121 is an air inlet, so that the bath type air supply is realized.

In some alternative embodiments, the first volute tongue 301 and the second volute tongue 302 are located on two opposite sides of the straight line where the center of the impeller 20 is located perpendicular to the first side wall 11, or the first volute tongue 301 and the second volute tongue 302 are located on two opposite sides of the straight line where the center of the impeller 20 is located perpendicular to the second side wall 12.

Since the first sidewall 11 and the second sidewall 12 of the casing are disposed oppositely, including a parallel relative disposition and a non-parallel relative disposition, the first position 110 on the first sidewall 11 and the second position 120 on the second sidewall 12 are located on two opposite sides of a straight line where the center of the impeller 20 and the perpendicular line of the first sidewall 11 are located, or the first position 110 on the first sidewall 11 and the second position 120 on the second sidewall 12 are located on two opposite sides of a straight line where the center of the impeller 20 and the perpendicular line of the second sidewall 12 are located.

By adopting the optional embodiment, when the channel 311 of the first volute tongue is opened, the channel 312 of the second volute tongue is closed, and the first volute tongue 301 works, the second volute tongue 302 plays a role of a rear volute tongue, so that an eccentric vortex generated at the first volute tongue 301 is more stable, and the wind conveying effect of the fan is improved.

When the channel 312 of the second volute tongue is opened, the channel 311 of the first volute tongue is closed, and the second volute tongue 302 works, the first volute tongue 301 plays a role of a rear volute tongue, so that an eccentric vortex generated at the second volute tongue 302 is more stable, and the wind conveying effect of the fan is improved.

Optionally, the center of the impeller 20 is taken as a center, and the two connecting lines are respectively connected to the front edge of the first volute tongue 301 and the front edge of the second volute tongue 302 from the center, and the angle between the two connecting lines is 120 ° to 240 °.

In some alternative embodiments, the volute tongue 30 includes a plurality of blades 32, the plurality of blades 32 are spaced apart from each other in a direction away from the impeller 20, and a gap between two adjacent blades 32 forms the channel 31.

With this alternative embodiment, the gap between two adjacent blades 32 forms a channel 31, and the volute tongue 30 includes a plurality of blades 32, it can be understood that the number of channels 31 formed by the plurality of blades 32 is also multiple, and a boundary layer inhaler is formed at the blades 32 to perform diffusion, reduce high wind speed near the eccentric vortex, and improve the performance of the fan.

In some alternative embodiments, the gap between two adjacent blades 32 is 3 mm to 5 mm.

If distance (clearance) undersize between blade 32, the air current can produce great noise when passing through, if the distance is too big between blade 32, blade 32 can't play the effect of snail tongue 30, forms eccentric vortex, sets up the distance between two blades 32 into 3 millimeters to 5 millimeters, adopts this optional embodiment, can form stable eccentric vortex, and noise abatement's generation promotes the performance of fan simultaneously.

In some alternative embodiments, the vane 32 includes a first vane plate 321 and a second vane plate 322, one end of the second vane plate 322 is connected to one end of the first vane plate 321, and the connection forms a bevel, and the opening of the bevel faces the impeller 20.

By adopting the optional embodiment, a break angle is arranged between the first blade plate 321 and the second blade plate 322, the break angle faces the impeller 20, the air inlet of the channel 31 and the air outlet of the channel 31 both correspond to the impeller 20, that is, the channel 31 is arc-shaped, the shape of the channel 31 corresponds to the flow direction of the eccentric eddy air flow, the wind resistance is reduced, and the performance of the fan is improved.

Alternatively, the break angle may be an acute angle, a right angle, or an obtuse angle.

Alternatively, the shape of the vanes 32 includes, but is not limited to, a louvered shape, an arcuate shape, a V-shape, or the like.

In some optional embodiments, the volute tongue 30 further includes a volute tongue 33, the volute tongue 33 is located between the blade 32 and the impeller 20 and has a gap with the impeller 20, and the volute tongue 33 is smoothly curved toward the impeller 20.

By adopting the optional embodiment, the volute tongue 33 is arranged at the impeller 20 and is provided with a gap with the impeller 20, so that the rotation of the impeller 20 is not influenced, and the volute tongue 33 is a smooth curved surface facing the impeller 20, so that the resistance of airflow flowing through the volute tongue 33 can be reduced, and the noise of the fan can be reduced.

Optionally, the volute tongue 30 includes a first volute tongue member and a second volute tongue member, the second volute tongue member is located between the first volute tongue member and the impeller 20, a channel 31 is formed between the first volute tongue member and the second volute tongue member, and the channel 31 is openable and closable.

By adopting the optional embodiment, a channel 31 is formed between the first volute tongue component and the second volute tongue component, the channel 31 is communicated with the windward side and the leeward side of the volute tongue 30, airflow circulates in the channel 31 due to the existence of pressure difference, the center of the eccentric vortex is stabilized at the position, close to the volute tongue 30, of the inner circumference of the impeller 20, and the performance of the fan is improved.

Optionally, the surface of the first tongue member facing the second tongue member is arcuate and/or the surface of the second tongue member facing the first tongue member is arcuate such that the channel 31 is arcuate.

Alternatively, the flow area of the passage 31 gradually increases in the air flow direction.

By adopting the optional embodiment, the flow area is gradually increased, the air pressure is gradually reduced, the air flow flows from the high-pressure area to the low-pressure area, the air diversion is realized, and the stability of the air pressure and the flow is improved, so that the performance of the fan is improved.

In some optional embodiments, the blower further includes volute tongue opening and closing devices 40, the number of the volute tongue opening and closing devices 40 is the same as that of the volute tongues 30, and the volute tongues opening and closing devices are arranged at the channel 31 and are used for opening or closing the channel 31.

With this alternative embodiment, each volute tongue 30 is provided with a volute tongue opening and closing device 40, when the fan works, one volute tongue 30 is selected to open the channel 31, the channels 31 of the other volute tongues 30 are closed, an eccentric vortex is formed at the position of the volute tongue 30 where the channel 31 is opened, and when the air outlet direction needs to be changed, the volute tongue opening and closing device 40 correspondingly changes the opened channel 31.

Alternatively, the vane 32 may be rotatably provided, and the passage 31 may be opened or closed by rotation of the vane 32.

In some alternative embodiments, the volute tongue opening and closing device 40 includes a baffle 44 and a driving mechanism, the baffle 44 is disposed at the volute tongue 30, the driving mechanism is connected to the baffle 44, and the driving mechanism drives the baffle 44 to move to open or close the channel 31.

With this alternative embodiment, the driving mechanism is connected to the baffle 44 to drive the baffle 44 to move, when the channel 31 needs to be closed, the driving mechanism drives the baffle 44 to move to one side of the channel 31 to block the air flow in the channel 31, and when the channel 31 needs to be opened, the driving mechanism drives the baffle 44 to move away from the channel 31, so that the air can flow through the channel 31.

Optionally, the driving mechanism slides the flap 44 up and down along the tongue 30 to open or close the passageway 31.

The driving mechanism comprises a rack 43, a gear 42 and a motor 41, wherein the rack 43 is arranged on the side surface of the baffle 44, the gear 42 is meshed with the rack 43, the motor 41 is connected with the gear 42, the gear 42 is driven by the motor 41 to rotate, and the gear 42 drives the rack 43 and the baffle 44 to slide up and down along the volute tongue 30.

Optionally, a drive mechanism rotates the flap 44 to open or close the channel 31.

The driving mechanism comprises a first gear, a second gear and a motor 41, wherein the first gear is arranged on the baffle 44 and is meshed with the second gear, the motor 41 is connected with the second gear, the second gear is driven by the motor 41 to rotate, and the second gear drives the first gear and the baffle 44 to rotate so as to open or close the channel 31.

Optionally, the blower further comprises a controller connected to the driving mechanism for controlling the driving mechanism to open or close the channel 31.

The embodiment discloses a household appliance, which comprises the fan.

The household appliance provided by the example of the present disclosure includes the fan in any one of the above embodiments, so that all the beneficial effects of the fan in any one of the above embodiments are achieved, and details are not repeated herein.

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 (10);

an impeller (20) rotatably disposed within the volute (10), the impeller (20) defining an interior space (21);

the number of the volute tongues (30) is multiple, the volute tongues (30) are arranged along the outer side of the impeller (20) at intervals, channels (31) are arranged on the volute tongues (30), two ends of each channel (31) are communicated with the inner space (21), and the channels (31) can be opened and closed.

2. The fan according to claim 1, wherein the volute (10) comprises a first sidewall (11) and a second sidewall (12) disposed opposite each other, and the plurality of volute tongues (30) comprises:

a first volute tongue (301) arranged on the first side wall (11);

and the second volute tongue (302) is arranged on the second side wall (12), wherein a channel (311) of the first volute tongue and a channel (312) of the second volute tongue are alternatively opened.

3. The fan according to claim 2, wherein the first volute tongue (301) and the second volute tongue (302) are located on two opposite sides of a straight line on which a perpendicular line of the first sidewall (11) is located in the center of the impeller (20), or on two opposite sides of a straight line on which a perpendicular line of the second sidewall (12) is located in the center of the impeller (20).

4. The fan of claim 1, wherein the volute tongue (30) comprises:

the impeller comprises a plurality of blades (32), the blades (32) are sequentially arranged at intervals in the direction far away from the impeller (20), and the gap between every two adjacent blades (32) forms the channel (31).

5. The fan according to claim 4, wherein the gap between two adjacent blades (32) is 3 mm to 5 mm.

6. The fan according to claim 4, wherein the blade (32) comprises:

a first vane plate (321);

one end of the second blade plate (322) is connected with one end of the first blade plate (321), a folded angle is formed at the connection position, and the opening of the folded angle faces the impeller (20).

7. The fan of claim 4, wherein the volute tongue (30) further comprises:

and the volute tongue (33) is positioned between the blade (32) and the impeller (20) and has a gap with the impeller (20), and the volute tongue (33) is a smooth curved surface facing the impeller (20).

8. The fan of any one of claims 1 to 7, further comprising:

the number of the volute tongue opening and closing devices (40) is the same as that of the volute tongues (30), the volute tongues correspond to one another, and the volute tongues opening and closing devices are arranged at the channel (31) and are used for opening or closing the channel (31).

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

10. Household appliance according to claim 9,

the household appliance comprises an air conditioner, a volute (10) is provided with a first air opening (111) and a second air opening (121), the opening of the first air opening (111) faces upwards along the horizontal direction or the opening of the first air opening faces downwards, and the opening of the second air opening (121) faces downwards;

wherein the first side wall (11) is positioned above the second side wall (12), and when the channel (311) of the first volute tongue is opened, air enters from the second air opening (121) and flows out from the first air opening (111); when the channel (312) of the second volute tongue is opened, air enters from the first air port (111) and flows out from the second air port (121).

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