Air conditioner

Abstract

The application provides an air conditioner, which comprises a shell, a cross-flow fan blade and a guide structure, the shell has an air duct, one side of the air duct has a volute tongue; the cross-flow fan blade is rotatably arranged in the air duct; the guide structure is arranged on the side of the air duct with the volute tongue, and the guide structure comprises a rotatable guide vane, which guides the airflow in the air duct by adjusting the angle. In this scheme, by adjusting the direction of the guide vane near the volute tongue position, the inlet angle of the secondary backflow inside the air duct can be changed, the large attack angle flow on the blade inside the eccentric vortex area of the cross-flow fan blade can be controlled, and the purpose of reducing flow separation and improving the performance of the cross-flow fan blade is achieved. Different flow rates are generated at different rotating speeds, so the position of the eccentric vortex deviates, the guide vane can adjust the angle according to different rotating speeds, so as to realize better fan performance, improve airflow flow uniformity, increase air volume, and reduce aerodynamic noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner. BACKGROUND

[0002] According to the characteristics of different fans, the fan in the indoor unit of a wall-mounted air conditioner is usually a cross-flow fan. Compared with traditional axial and centrifugal fans, there are obvious differences in the internal flow of the cross-flow fan, which is mainly because when the airflow passes through the cross-flow fan blade, a part of the airflow will backflow into the cross-flow fan twice through the gap between the cross-flow fan blade and the volute tongue. Since the attack angle of the airflow entering the cross-flow fan blade is negative, flow separation and shedding vortices are caused, which rotate and collapse together with the eccentric vortex, and at the same time, energy is input to the eccentric vortex, which affects the air volume of the cross-flow fan blade and produces aerodynamic noise.

[0003] Patent CN106351882B provides a cross-flow fan with a volute tongue structure, which includes an air inlet grille, a volute, a cross-flow fan blade, a volute tongue, and an evaporator. The volute tongue structure formed by the volute tongue is arranged in a curved structure, and the concave-convex part is arranged in a circular arc profile. The overall volute tongue is smoothly transitioned. The chord length of the cross-flow fan blade is C, the height of the volute tongue is h, the central angle of the curve of the volute tongue structure is α, and the central angle of one concave-convex curve in the volute tongue structure is α. Then h = 0.06C ~ 0.12C, n = 4, 5, 6, 7, 8. The arrangement of the volute tongue curve structure reduces the airflow resistance, and at the same time, the position of the eccentric vortex is closer to the volute tongue compared to the original volute fan, the outlet backflow volume is reduced, and more gas flows out from the outlet, so the flow rate is increased. Since the surface of the volute tongue is a curved surface, the interference between the blade and the volute tongue will be weakened, and the discrete noise will be further modulated. In the case of basically unchanged noise, the noise sharpness is reduced, and the purpose of increasing the flow rate and reducing the noise sharpness is achieved.

[0004] Patent CN103968517B provides an air conditioner indoor unit, which includes a bottom shell, a cross-flow fan, a heat exchanger, a front volute tongue, and a rear volute tongue arranged on the bottom shell. The left fin gap of the heat exchanger is smaller than the right fin gap. The front volute tongue includes a front left segment volute tongue and a front right segment volute tongue, and the rear volute tongue includes a rear left segment volute tongue and a rear right segment volute tongue. The front left segment volute tongue and the rear left segment volute tongue are respectively opposite to the left fin of the heat exchanger, and the front right segment volute tongue and the rear right segment volute tongue are respectively opposite to the right fin of the heat exchanger. S11 > S12, so that L11 < L12, and / or S21 > S22, so that L21 < L22. The air conditioner indoor unit provided in the patent improves the uneven air outlet and surge phenomenon of the air conditioner indoor unit under the premise of ensuring the air volume, and also reduces the noise of the air conditioner indoor unit.

[0005] Patent CN103062121B discloses a volute tongue, which comprises a volute tongue body and a volute tongue chamfer portion, the volute tongue body has a guide surface towards a cross-flow fan blade, the guide surface has a top and a bottom at the front and rear ends in the rotation direction of the cross-flow fan blade, and the guide surface comprises a convex surface protruding towards the cross-flow fan blade and a remaining surface.

[0006] However, the above-mentioned scheme still has unsatisfactory improvement effect on the air volume and noise of the cross-flow fan blade, and it is necessary to provide a new technical scheme for optimization. SUMMARY

[0007] The application provides an air conditioner to improve the air volume and reduce the noise of the cross-flow fan blade in the air conditioner.

[0008] In order to achieve the above-mentioned purpose, the application provides an air conditioner, which comprises a shell having an air duct, the air duct has a volute tongue on one side; a cross-flow fan blade rotatably arranged in the air duct; a guide structure arranged on the side of the air duct having the volute tongue, the guide structure comprises a rotatable guide vane, and the guide vane guides the airflow in the air duct by adjusting the angle.

[0009] Further, the guide vane comprises a plurality of sub-vanes arranged in sequence, the plurality of sub-vanes extend along the length direction of the cross-flow fan blade, and the plurality of sub-vanes of the guide vane rotate synchronously.

[0010] Further, the cross-flow fan blade has a multi-section structure, and the number of the sub-vanes in the guide vane is less than or equal to the number of nodes of the cross-flow fan blade.

[0011] Further, the rotation direction of the guide vane is the same as the rotation direction of the cross-flow fan blade, the air conditioner further comprises an evaporator arranged around the cross-flow fan blade and the guide structure, the position where the width direction of the guide vane is perpendicular to the inner wall of the evaporator is the starting position of the guide vane, and the rotation angle range of the guide vane is 0 to a, wherein a is greater than or equal to 30 degrees.

[0012] Further, the rotation speed of the cross-flow fan blade has a low wind range β1, a medium wind range β2 and a high wind range β3; when the rotation speed of the cross-flow fan blade is β1, the rotation angle of the guide vane is α1; when the rotation speed of the cross-flow fan blade is β2, the rotation angle of the guide vane is α2; when the rotation speed of the cross-flow fan blade is β3, the rotation angle of the guide vane is α3; wherein β1=[600rpm, 800rpm], β2=[800rpm, 1000rpm], β3=[1000rpm, 1300rpm], α1=[3°, 11°], α2=[12°, 20°], and α3=[21°, 34°].

[0013] Further, the guide vane is an arc-shaped vane, and a radius of an inner side of the guide vane is R, R=[9mm, 15mm].

[0014] Further, a thickness of the guide vane is D, D=[0.5mm, 2mm].

[0015] Further, the guide vanes are multiple, and the multiple guide vanes are distributed along a circumferential direction of the cross-flow fan blade.

[0016] Further, the guide flow structure further comprises an arc-shaped connecting piece, the connecting piece is arranged around the cross-flow fan blade, and the multiple guide vanes and the connecting piece are rotationally connected.

[0017] Further, the air conditioner further comprises a driving part installed in the shell, and the driving part drives the multiple guide vanes to rotate synchronously.

[0018] Further, the driving part comprises a motor and a connecting rod mechanism, the motor is fixed in the shell, and the motor drives the multiple guide vanes to rotate through the connecting rod mechanism.

[0019] Further, the connecting rod mechanism comprises a crank, a large connecting rod and multiple small connecting rods, one end of the crank is fixedly connected with an output shaft of the motor, the other end of the crank is hingedly connected with one end of the large connecting rod, the multiple small connecting rods are arranged side by side, one end of each small connecting rod is hingedly connected with the large connecting rod, and the other end of each small connecting rod is fixedly connected with one guide vane.

[0020] The technical scheme of the present application provides an air conditioner, which comprises a shell, a cross-flow fan blade and a guide flow structure, the shell has an air duct, one side of the air duct has a volute tongue, the cross-flow fan blade is rotationally arranged in the air duct, and the guide flow structure is arranged at the side of the air duct with the volute tongue, and the guide flow structure comprises rotationally arranged guide vanes, the guide vanes guide the airflow in the air duct by adjusting the angle. In the scheme, by adjusting the direction of the guide vane close to the volute tongue, the inlet angle of the secondary reflux in the air duct can be changed, the large attack angle flow on the blade in the eccentric vortex area of the cross-flow fan blade can be controlled, the flow separation can be reduced, and the performance of the cross-flow fan blade can be improved. Different flow rates are generated at different rotating speeds, the position of the eccentric vortex deviates, the guide vane can adjust the angle according to different rotating speeds, the better fan performance can be realized, the airflow flow uniformity is improved, the air volume is increased, and the aerodynamic noise is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the application, and do not limit the present application in any manner. In the drawings:

[0022] Figure 1A schematic diagram of the structure of an air conditioner provided in an embodiment of the present invention is shown;

[0023] Figure 2 It shows Figure 1 A schematic diagram of some structures in an air conditioner;

[0024] Figure 3 It shows Figure 1 A schematic diagram showing the combination of the cross-flow fan blades and the air guide structure;

[0025] Figure 4 It shows Figure 1 A magnified view of a portion of the image;

[0026] Figure 5 A schematic diagram showing the cooperation between the drive unit and the air guiding structure in an air conditioner provided by an embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Outer shell; 11. Volute; 20. Cross-flow fan blade; 30. Guide structure; 31. Guide vane; 311. Sub-blade; 32. Connecting part; 40. Evaporator; 50. Drive unit; 51. Crank; 52. Main connecting rod; 53. Small connecting rod. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 5 As shown, an embodiment of the present invention provides an air conditioner, including: a housing 10, the housing 10 having an air duct, and a volute 11 on one side of the air duct; a cross-flow fan blade 20, rotatably disposed within the air duct; and a flow guiding structure 30 disposed within the air duct on the side with the volute 11, the flow guiding structure 30 including rotatable guide vanes 31, the guide vanes 31 guiding the airflow within the air duct by adjusting their angle. In this design, the sidewall of the air duct is the volute, and the volute and the cross-flow fan blade 20 constitute a fan.

[0031] In the scheme, by adjusting the direction of the guide vane 31 near the volute tongue 11 position, the inlet angle of the secondary reflux inside the air duct can be changed, the large angle of attack flow on the blade in the eccentric vortex area of the cross-flow fan blade 20 is controlled, so as to reduce the flow separation, and then the performance of the cross-flow fan blade 20 is improved. Different flow rates will be generated at different rotating speeds, so the position of the eccentric vortex deviates, and the guide vane 31 can adjust the angle according to different rotating speeds to achieve better fan performance, improve airflow uniformity, increase air volume, and reduce aerodynamic noise.

[0032] Among them, the guide vane 31 includes a plurality of sub-vanes 311 arranged in sequence, and the plurality of sub-vanes 311 extend along the length direction of the cross-flow fan blade 20. The plurality of sub-vanes 311 of the guide vane 31 rotate synchronously. The guide vane 31 is provided as a plurality of sub-vanes 311 to avoid that the integral guide vane is too long to be processed. Moreover, the connection between the two sub-vanes 311 can be supported to avoid that the integral guide vane is too long to be deformed.

[0033] In the embodiment, the cross-flow fan blade 20 has a multi-section structure, and the number of the sub-vanes 311 in the guide vane 31 is less than or equal to the number of sections of the cross-flow fan blade 20. Through the above arrangement, the number of components is avoided to be too large while ensuring the guide effect.

[0034] In the embodiment, the rotating direction of the guide vane 31 is the same as the rotating direction of the cross-flow fan blade 20, and the air conditioner further includes an evaporator 40 arranged around the cross-flow fan blade 20 and the guide structure 30. The position where the width direction of the guide vane 31 is perpendicular to the inner wall of the evaporator 40 is the starting position of the guide vane 31, and the rotating angle range of the guide vane 31 is 0 to α, where α≥30°. In use, the guide vane 31 is rotated to a suitable angle, so that the airflow in the air duct can be guided. The position where the width direction of the guide vane 31 is perpendicular to the inner wall of the evaporator 40 is set as the starting position of the guide vane 31, and the rotating range of the guide vane is set to be greater than 30°, so that the cross-flow fan blade 20 has a good guide effect at different wind speeds.

[0035] During the operation of the air conditioner, there is a low pressure area inside the cross-flow fan blade 20, the static pressure at this position is lower than the external atmospheric pressure, and a stable eccentric vortex exists. The vortex core of the eccentric vortex is located on the inner circumference of the cross-flow fan blade 20 near the volute tongue 11, and the pressure at the vortex core position is the lowest. Due to the existence of the low pressure area eccentric vortex, the flow field inside the cross-flow fan blade 20 is divided into two relatively independent parts, i.e. the cross-flow area and the eccentric vortex area. The pressure in the cross-flow area is consistent with the inlet and outlet, the fluid is sucked into the cross-flow fan blade 20 from the inlet, rotates with the cross-flow fan blade 20, and then changes direction to be discharged from the outlet. The fluid in the eccentric vortex area is mainly generated by the reflux, rotates around the vortex core, and is distributed in a belt shape from the vortex core outward, gradually increasing from the volute of the air duct to the volute tongue 11.

[0036] The guide vane 31 with a proper inlet angle can reduce the area of the eccentric vortex region and expand the area of the through-flow region. Figure 4 As shown in the figure, the region A is close to the volute tongue structure and is a region where backflow is prone to occur, and the backflow can make the airflow in the region B present a large negative attack angle. In the present solution, the flow direction of the airflow in the region B can be changed by adjusting the angle of the guide vane 31, so that the negative attack angle of the fluid in the region B is reduced when passing through the guide vane 31, thereby reducing the flow separation phenomenon and reducing the area of the eccentric vortex, and improving the aerodynamic performance of the fan.

[0037] Specifically, the rotating speed of the through-flow fan blade 20 has a low wind gear β1, a medium wind gear β2 and a high wind gear β3; when the rotating speed of the through-flow fan blade 20 is β1, the rotating angle of the guide vane 31 is α1; when the rotating speed of the through-flow fan blade 20 is β2, the rotating angle of the guide vane 31 is α2; when the rotating speed of the through-flow fan blade 20 is β3, the rotating angle of the guide vane 31 is α3; wherein β1 = [600 rpm, 800 rpm], β2 = [800 rpm, 1000 rpm], β3 = [1000 rpm, 1300 rpm], α1 = [3°, 11°], α2 = [12°, 20°], and α3 = [21°, 34°]. Preferably, α1 is 10°, α2 is 15°, and α3 is 28°.

[0038] When other conditions are the same, the position of the eccentric vortex is mainly related to the rotating speed of the through-flow fan blade 20, and the increase of the flow rate can make the eccentric vortex move to the side of the volute tongue 11 and the size thereof is reduced. After the guide structure 30 is added, different angles of the guide vane 31 can be adjusted according to different rotating speeds, so as to control the position of the eccentric vortex region, so that the eccentric vortex region is minimized and the through-flow region is maximized. Through the corresponding setting of the above rotating speed range and angle range, the through-flow fan blade 20 can realize a smaller eccentric vortex region at different rotating speeds, thereby improving the aerodynamic performance of the fan.

[0039] Through the above setting, the large attack angle flow on the blade in the eccentric vortex region can be controlled, so as to reduce the flow separation, realize a better performance of the through-flow fan, improve the airflow flow uniformity, increase the air volume, and reduce the aerodynamic noise.

[0040] In the present embodiment, the guide vane 31 is an arc-shaped blade, and the radius of the inner side of the guide vane 31 is R, R = [9 mm, 15 mm]. In this way, a good guide effect can be achieved, and the radius of the inner side of the guide vane 31 is preferably 12 mm.

[0041] Wherein, the thickness of the guide vane 31 is D, D = [0.5 mm, 2 mm], so as to ensure the structural strength and avoid excessive weight of the guide vane 31. The thickness of the guide vane 31 is preferably 1 mm.

[0042] As shown in the figure, Figure 2 and Figure 3As shown, the guide vanes 31 are multiple, and the multiple guide vanes 31 are distributed along the circumference of the cross-flow fan blade 20. In this way, the airflow can be guided by the multiple guide vanes 31 together, and the guiding effect is improved.

[0043] In the embodiment, the guide structure 30 further comprises an arc-shaped connecting piece 32, the connecting piece 32 is arranged around the cross-flow fan blade 20, and the multiple guide vanes 31 are rotationally connected with the connecting piece 32. The connecting piece 32 supports the guide vanes 31. The connecting piece 32 is arranged in an arc shape, which facilitates the distribution of the multiple guide vanes 31 around the cross-flow fan blade 20.

[0044] Among them, the connecting piece 32 can be provided in multiple, multiple connecting pieces 32 are arranged along the length direction of the cross-flow fan blade 20, in this way, the guide vanes 31 can be supported by multiple connecting pieces 32, and the structural stability is improved.

[0045] Optionally, the two ends of the connecting piece 32 are respectively clamped with the bottom shell in the shell 10, and the clamping mode is adopted, which has high assembly efficiency and is convenient for disassembly and maintenance.

[0046] Optionally, the guide structure 30 further comprises a rotating shaft and a bearing, the bearing is installed in the connecting piece 32, the rotating shaft passes through the bearing, and the rotating shaft and the guide vanes 31 are fixedly connected.

[0047] In the scheme, the air conditioner further comprises a driving part 50 installed in the shell 10, and the driving part 50 drives the multiple guide vanes 31 to rotate synchronously. The multiple guide vanes 31 are driven to rotate synchronously by the same driving part 50, so that the structure and occupied space of the device can be simplified, and the cost is reduced.

[0048] Specifically, the driving part 50 comprises a motor and a connecting rod mechanism, the motor is fixed in the shell 10, and the motor drives the multiple guide vanes 31 to rotate through the connecting rod mechanism. Through the connection of the connecting rod mechanism and the multiple guide vanes 31, the connecting rod mechanism drives the multiple guide vanes 31 to rotate when moving, so as to realize the synchronous rotation of the multiple guide vanes 31.

[0049] Among them, the connecting rod mechanism comprises a crank 51, a large connecting rod 52 and multiple small connecting rods 53, one end of the crank 51 is fixedly connected with the output shaft of the motor, the other end of the crank 51 is hinged with one end of the large connecting rod 52, the multiple small connecting rods 53 are arranged side by side, one end of each small connecting rod 53 is hinged with the large connecting rod 52, and the other end of each small connecting rod 53 is fixedly connected with one guide vane 31. The motor drives the crank 51 to rotate, the crank 51 drives the large connecting rod 52 to move, and the large connecting rod 52 drives the multiple small connecting rods 53 to rotate, so that the multiple small connecting rods 53 drive the multiple guide vanes 31 to rotate.

[0050] Through the above scheme, a set of adjustable angle guide vanes 31 are installed near the area near the volute tongue 11 of the cross-flow fan, by adjusting the direction of the guide vanes 31, the inlet angle of the secondary reflux in the fan is changed, the large attack angle flow on the blade in the eccentric vortex area is controlled, so as to achieve the purpose of reducing flow separation, and then improving the performance of the cross-flow fan. Different flow rates will be generated under different fan speeds, so the position of the eccentric vortex deviates, the guide vanes can automatically adjust the angle according to different speeds to achieve better fan performance, improve airflow uniformity, increase air volume and reduce aerodynamic noise.

[0051] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0052] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0053] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments are not meant to limit the scope of the present application. It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for ease of description. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the disclosure where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0054] In the description of the application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0055] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0056] In addition, it should be noted that the use of "first", "second" and the like to define parts has only the purpose of facilitating the distinction of the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the application.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises a shell (10) having an air duct, one side of the air duct having a volute tongue (11); a cross-flow fan blade (20) rotatably arranged in the air duct; a guide structure (30) arranged on the side of the air duct having the volute tongue (11), the guide structure (30) comprising rotatable guide vanes (31) for guiding the airflow in the air duct by adjusting the angle; the rotation direction of the guide vanes (31) is the same as that of the cross-flow fan blade (20), and the air conditioner further comprises an evaporator (40) arranged around the cross-flow fan blade (20) and the guide structure (30); the width direction of the guide vanes (31) is perpendicular to the inner wall of the evaporator (40) at the starting position of the guide vanes (31), and the rotation angle range of the guide vanes (31) is 0 to a, wherein a >= 30°; the rotation speed of the cross-flow fan blade (20) has a low wind speed range β1, a medium wind speed range β2 and a high wind speed range β3; when the rotation speed of the cross-flow fan blade (20) is β1, the rotation angle of the guide vanes (31) is α1; when the rotation speed of the cross-flow fan blade (20) is β2, the rotation angle of the guide vanes (31) is α2; when the rotation speed of the cross-flow fan blade (20) is β3, the rotation angle of the guide vanes (31) is α3; wherein β1 = [600 rpm, 800 rpm], β2 = [800 rpm, 1000 rpm], β3 = [1000 rpm, 1300 rpm], α1 = [3°, 11°], α2 = [12°, 20°], α3 = [21°, 34°]. The guide vanes (31) comprise a plurality of sequentially arranged sub-vanes (311), and the plurality of sub-vanes (311) extend along the length direction of the cross-flow fan blade (20); the plurality of sub-vanes (311) of the guide vanes (31) rotate synchronously. The cross-flow fan blade (20) has a multi-section structure, and the number of the sub-vanes (311) in the guide vanes (31) is less than or equal to the number of nodes of the cross-flow fan blade (20). The guide vanes (31) are arc-shaped blades, and the inner radius of the guide vanes (31) is R, R = [9 mm, 15 mm]. The thickness of the guide vanes (31) is D, D = [0.5 mm, 2 mm]. The guide vanes (31) are a plurality of, and the plurality of guide vanes (31) are distributed along the circumferential direction of the cross-flow fan blade (20).

2. The air conditioner of claim 1, wherein The guide structure (30) further comprises an arc-shaped connecting piece (32) arranged around the cross-flow fan blade (20), and the plurality of guide vanes (31) and the connecting piece (32) are rotationally connected.

3. The air conditioner of claim 2, wherein The air conditioner further comprises a driving part (50) mounted in the shell (10), and the driving part (50) drives the plurality of guide vanes (31) to rotate synchronously.

4. The air conditioner of claim 1, wherein The driving part (50) comprises a motor and a connecting rod mechanism, the motor is fixed in the shell (10), and the motor drives the plurality of guide vanes (31) to rotate through the connecting rod mechanism.

5. The air conditioner of claim 1, wherein ​ 6. The air conditioner of claim 1, wherein ​ 7. The air conditioner of claim 6, wherein ​ 8. The air conditioner of claim 6, wherein ​ 9. The air conditioner of claim 8, wherein ​ 10. The air conditioner of claim 9, wherein The connecting rod mechanism comprises a crank (51), a large connecting rod (52) and a plurality of small connecting rods (53), one end of the crank (51) is fixedly connected with the output shaft of the motor, the other end of the crank (51) is hingedly connected with one end of the large connecting rod (52), the plurality of small connecting rods (53) are arranged side by side, one end of each small connecting rod (53) is hingedly connected with the large connecting rod (52), and the other end of each small connecting rod (53) is fixedly connected with one guide vane (31).

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