Patent Description:
In a fan blade of an air conditioner in an art known to inventors, a motor shaft is extended into an axial hole of a fan blade shaft of the fan blade, and a fastening screw is tightened from an outside of the fan blade shaft, so that the fastening screw is abutted against an outer wall surface of the motor shaft, in this way, the motor shaft can drive the fan blade shaft to be rotated. An outer wall surface of the fan blade shaft is provided with a support part for supporting the fan blade shaft, and the support part is provided with a shaft hole through which the fan blade shaft passes. Because there is not a gap between the shaft hole of the support part and the outer wall surface of the fan blade shaft, while a motor drives the fan blade shaft to be rotated, friction and collision happen between the outer wall surface of the fan blade shaft and an inner wall surface of the shaft hole of the support part, so an abnormal sound is made while the motor drives the fan blade shaft to be rotated. That is, the air conditioner in the art known to inventors makes the abnormal sound due to the friction and collision while the fan blade is rotated.

An air duct assembly is disclosed in document <CIT>.

The invention is defined by the independent claim. Embodiments are given by the dependent claims.

Some embodiments of the present invention provide a fan blade support assembly for a fan blade, an air duct assembly, and an air conditioner, so as to solve a problem in an art known to inventors that the air conditioner makes an abnormal sound due to friction and collision while the fan blade is rotated.

Some embodiments of the present invention provide a fan blade support assembly for a fan blade, the fan blade support assembly includes: a support base, the support base includes a support base body, and the support base body is provided with a support base hole; a support structure, provided in the support base hole, and the support structure is provided with a shaft hole; and a fan blade shaft, an end of the fan blade shaft is connected with a drive portion after passing through the shaft hole, and the fan blade shaft is movably provided relative to the support base, wherein, the fan blade shaft includes a first shaft section and a second shaft section connected with the first shaft section, and a diameter of the first shaft section is less than a diameter of the second shaft section.

In some embodiments, the fan blade shaft is provided with a first position which can be driven by the drive portion and a second position separated from the drive portion, when the fan blade shaft is positioned in the first position, there is a gap between an outer wall surface of the first shaft section and an inner wall surface of the shaft hole, and when the fan blade shaft is positioned in the second position, the second shaft section is abutted against the inner wall surface of the shaft hole.

In some embodiments, the fan blade shaft further includes a transition section disposed between the first shaft section and the second shaft section, from the first shaft section to the second shaft section, an outer diameter of the transition section is gradually increased.

In some embodiments, the fan blade shaft further includes the transition section disposed between the first shaft section and the second shaft section, from the first shaft section to the second shaft section, an outer diameter of the transition section is gradually increased, the fan blade shaft is provided with a first position and a second position, when the fan blade shaft is positioned in the first position, there is the gap between an outer wall surface of the first shaft section and an inner wall surface of the shaft hole; and when the fan blade shaft is positioned in the second position, the transition section is abutted against the inner wall surface of the shaft hole.

In some embodiments, the support structure is a sleeve provided at an outer circumference of the fan blade shaft in a sleeving manner, an internal through hole of the sleeve forms the shaft hole, and the sleeve is an elastic part.

Some embodiments of the present invention provide an air duct assembly, the air duct assembly includes an installing base, and the air duct assembly further includes the above fan blade support assembly installed on the installing base and a fan blade connected with the fan blade shaft.

In some embodiments, the air duct assembly further includes the drive portion, the fan blade shaft is provided with the first position and the second position, when the fan blade shaft is positioned in the first position, the fan blade shaft can be driven by the drive portion; and when the fan blade shaft is positioned in the second position, the fan blade shaft is separated from the drive portion.

In some embodiments, the fan blade shaft is provided with an axial hole, a motor shaft of the drive portion is inserted into the axial hole, so as to connect the drive portion and the fan blade shaft.

In some embodiments, the axial hole passes through the first shaft section and the second shaft section.

In some embodiments, the fan blade shaft is further provided with a radial hole communicated with the axial hole, the air duct assembly further includes a locking part, the locking part passes through the radial hole and abuts against the motor shaft, so that the motor shaft is locked on the fan blade shaft.

In some embodiments, the radial hole is opened in the second shaft section.

Some embodiments of the present invention provide an air conditioner, and the air conditioner includes a housing and an air duct assembly installed in the housing, the air duct assembly is the above air duct assembly.

In some embodiments of the present invention, the fan blade support assembly is applied to the air duct assembly of the air conditioner, and the fan blade support assembly is adopted, when the fan blade shaft is connected with the drive portion, the first shaft section of the fan blade shaft is disposed in the shaft hole of the support structure. Because the diameter of the first shaft section is less than a diameter of the second shaft section, and the fan blade shaft is moveably provided relative to the support base, when the fan blade shaft is connected with the drive portion, there is the gap between the outer wall surface of the first shaft section of the fan blade shaft and the inner wall surface of the shaft hole of the support structure, in this way, when the drive portion drives the fan blade shaft to be rotated, the mutual friction or collision, caused by tiny shaft runout, between the outer wall surface of the fan blade shaft and the inner wall surface of the shaft hole of the support structure is avoided, thereby the noise is reduced, and the problem in the art known to inventors that the abnormal sound and noise are caused by the friction or collision between the fan blade shaft and the support structure is solved. In addition, the fan blade support assembly in some embodiments can prevent the fan blade shaft from being worn.

The drawings of the description forming a part of the present invention are used to provide further understanding to the present invention, schematic embodiments of the present invention and descriptions thereof are used to explain the present invention, and do not form improper limitation to the present invention. In the drawings:.

Herein, the above drawings include the following reference signs:
<NUM>, Fan blade; <NUM>, Fan blade shaft; <NUM>, First shaft section; <NUM>, Second shaft section; <NUM>, Transition section; <NUM>, Axial hole; <NUM>, Radial hole; <NUM>, Support structure; <NUM>, Shaft hole; <NUM>, Support base; <NUM>, Locking part; <NUM>, Drive portion; <NUM>, Installing shaft sleeve; and <NUM>, Installing base.

It is to be noted that embodiments in the present invention and features in the embodiments are mutually combined without confliction. The present invention is described in detail below with reference to the drawings and in combination with the embodiments.

In the art known to inventors, the fan blade shaft is in locking-connection with the motor shaft of the drive portion, and after the motor shaft is connected with the fan blade shaft, there is not the support structure around, that is, there is a gap radially disposed between an outer wall surface of the fan blade shaft and the installing base, that is, the fan blade shaft is located in a suspension state. In the air conditioner based on such setting, while the fan blade is assembled, the fan blade shaft is required to be aligned to the motor shaft, only in this way, the fan blade shaft is in locking-connection with the motor shaft of the drive portion. However, in the air conditioner, the fan blade shaft and the motor shaft are shielded by an evaporator, an angle of view of the fan blade shaft and the motor shaft is very small to an operator, so the difficulty of aligning the fan blade shaft and the motor shaft is increased. That is, in the art known to inventors, it is difficult to be aligned while the fan blade shaft and the motor shaft are assembled, so the operation is difficult, the assembly efficiency is low, and the alignment accuracy is lower. In order to solve the above problem in the art known to inventors, the following embodiments are provided by the inventor.

As shown in <FIG>, an embodiment of the present invention provides a fan blade support assembly for a fan blade. The fan blade support assembly in Embodiment <NUM> includes a support base <NUM>, a support structure <NUM> and a fan blade shaft <NUM>; the support base <NUM> includes a support base body, and the support base body is provided with a support base hole; the support structure <NUM> is installed in the support base hole, and the support structure <NUM> is provided with a shaft hole <NUM>; one end of the fan blade shaft <NUM> is connected with a drive portion <NUM> after passing through the shaft hole <NUM>, and the fan blade shaft <NUM> is moveably installed relative to the support base <NUM>, wherein, the fan blade shaft <NUM> includes a first shaft section <NUM> and a second shaft section <NUM> connected with the first shaft section <NUM>, and a diameter of the first shaft section <NUM> is less than a diameter of the second shaft section <NUM>.

In embodiment <NUM>, the fan blade support assembly is applied to an air duct assembly of an air conditioner, while the fan blade support assembly is adopted, and the fan blade shaft <NUM> is connected with the drive portion <NUM>, the first shaft section <NUM> of the fan blade shaft <NUM> is disposed in a shaft hole <NUM> of the support structure <NUM>. Because the diameter of the first shaft section <NUM> is less than that of the second shaft section <NUM>, and the fan blade shaft <NUM> is moveably provided relative to the support base <NUM>, while the fan blade shaft <NUM> is connected with the drive portion <NUM>, there is a gap between an outer wall surface of the first shaft section <NUM> of the fan blade shaft <NUM> and an inner wall surface of the shaft hole <NUM> of the support structure <NUM>, in this way, while the drive portion <NUM> drives the fan blade shaft <NUM> to be rotated, the mutual friction or collision, caused by tiny shaft runout, between the outer wall surface of the fan blade shaft <NUM> and the inner wall surface of the shaft hole <NUM> of the support structure <NUM> is avoided, thereby a noise is reduced, and the problem in the art known to inventors that the abnormal sound and noise are caused by the friction between the fan blade shaft and the support structure is solved. Further, because the friction is smaller, the fan blade support assembly in the above setting prevents the fan blade shaft <NUM> from being worn.

As shown in <FIG>, in Some embodiments, the fan blade shaft <NUM> is provided with a first position which is driven by the drive portion <NUM> and a second position separated from the drive portion <NUM>, when the fan blade shaft <NUM> is positioned in the first position, there is a gap between an outer wall surface of the first shaft section <NUM> and an inner wall surface of the shaft hole <NUM>, and when the fan blade shaft <NUM> is positioned in the second position, the second shaft section <NUM> is abutted against the inner wall surface of the shaft hole <NUM>.

In some embodiments, the fan blade support assembly is applied to the air duct assembly of the air conditioner. When the air conditioner is located in a normal working state, the fan blade shaft <NUM> is positioned in the first position, and the drive portion <NUM> drives the fan blade shaft <NUM> to be rotated. When the fan blade <NUM> and the fan blade support assembly are required to be detached from the air conditioner, in an axis direction of the shaft hole <NUM>, the fan blade <NUM> is moved towards a direction away from the drive portion <NUM>, so the fan blade shaft <NUM> is switched from the first position to the second position, that is, the fan blade shaft <NUM> is separated from the drive portion <NUM>, in this way, the fan blade <NUM> and the fan blade support assembly are detached.

In some embodiments, the fan blade support assembly and the fan blade <NUM> are assembled together, as a modularized structure. In the embodiments, the fan blade <NUM> is connected with the fan blade shaft <NUM>, when the fan blade shaft <NUM> is positioned in the second position, the outer wall surface of the second shaft section <NUM> is abutted against the inner wall surface of the shaft hole <NUM>. In this way, the support structure <NUM> limits the fan blade shaft <NUM> to be moved in a radial direction of the shaft hole <NUM>, thereby in a process of detaching the fan blade <NUM> and the fan blade support assembly, the fan blade shaft <NUM> does not move along the radial direction of the shaft hole <NUM> relative to the support base <NUM>. While the fan blade <NUM> and the fan blade support assembly are required to be installed in the air conditioner, because the fan blade shaft <NUM> doe not move along the radial direction of the shaft hole <NUM> relative to the support base <NUM>, after the fan blade <NUM> and the fan blade support assembly are installed in the air conditioner, a position in which an axis of the fan blade shaft <NUM> is positioned is not changed relative to the position before detaching, that is, the fan blade shaft <NUM> and the motor shaft of the drive portion <NUM> have a same axis at this moment. At this moment, in an axis direction of the shaft hole <NUM>, the fan blade <NUM> is moved towards a direction of the drive portion <NUM>, that is, the fan blade shaft <NUM> is connected with the drive portion <NUM>, in this process, due to the support effect of the support structure <NUM>, an operator does not need to hold the fan blade shaft <NUM> by hands so as to align the fan blade shaft <NUM> and the drive portion <NUM>, therefore, the technical solutions in some embodiments are convenient in operation, and higher in assembly efficiency. In this way, the embodiments are capable of, in the case of blind assembling, achieving a function that the fan blade shaft <NUM> is automatically aligned to the motor shaft of the drive portion <NUM>, and the centering accuracy is higher.

As shown in <FIG>, in some embodiments, the fan blade shaft <NUM> further includes a transition section <NUM> disposed between the first shaft section <NUM> and the second shaft section <NUM>, from the first shaft section <NUM> to the second shaft section <NUM>, an outer diameter of the transition section <NUM> is gradually increased.

In some embodiments, the transition section <NUM> is disposed between the first shaft section <NUM> and the second shaft section <NUM>. From the first shaft section <NUM> to the second shaft section <NUM>, the outer diameter of the transition section <NUM> is gradually increased, so there is a smooth transition between the first shaft section <NUM> and the second shaft section <NUM>. In a process of enabling the fan blade shaft <NUM> to be switched from the first position to the second position, a hole opening, towards the drive portion <NUM>, of the shaft hole <NUM> of the support structure <NUM> is slided on a conical surface of the transition section <NUM>, so that the fan blade shaft <NUM> is automatically centered in the process of switching from the first position to the second position relative to the axis of the shaft hole <NUM> of the support structure <NUM>, that is, in the process of switching the fan blade shaft <NUM> from the first position to the second position, the position of the fan blade shaft <NUM> is automatically corrected by using the transition section <NUM> of the fan blade shaft <NUM>.

In other words, in the process of switching the fan blade shaft <NUM> from the first position to the second position, the transition section <NUM> has the effect of centering and correcting. While the fan blade <NUM> and the fan blade support assembly are assembled in the air conditioner, the coaxiality between the fan blade shaft <NUM> of the assembled air conditioner and the motor shaft of the drive portion <NUM> is high, and axial runout caused by the deviation of a shaft center of the fan blade shaft <NUM> and a shaft center of the motor shaft is prevented during later operation, then the overall operation of the air conditioner and the service life thereof are affected.

As shown in <FIG>, in an embodiment, the support structure <NUM> is a sleeve provided at an outer circumference of the fan blade shaft <NUM> in a sleeving manner, an internal through hole of the sleeve forms the shaft hole <NUM>, and the sleeve is an elastic part.

In some embodiments, the fan blade shaft <NUM> is connected with the drive portion <NUM> after passing through the internal through hole of the sleeve. In addition, when the fan blade shaft <NUM> is positioned in the second position, an inner wall surface of the sleeve is abutted against an outer wall surface of the second shaft section <NUM> of the fan blade shaft <NUM>, thereby the fan blade shaft <NUM> is prevented from being moved along the radial direction of the internal through hole of the sleeve, it is convenient to assemble the fan blade shaft <NUM> and the motor shaft later. In the above setting, a contact area of the internal through hole of the sleeve and the fan blade shaft <NUM> is large, an acting area of the sleeve on the fan blade shaft <NUM> is large, the sleeve prevents the fan blade shaft <NUM> to be moved along the radial direction of the shaft hole <NUM> relative to the support base <NUM> better. In an embodiment, the sleeve is the elastic part, and good in abrasive resistance. In an embodiment, the sleeve is made of a rubber material, and small in weight.

As shown in <FIG>, some embodiments of the present invention provide an air duct assembly. The air duct assembly includes an installing base <NUM>, the air duct assembly further includes a fan blade support assembly installed on the installing base <NUM> and a fan blade <NUM> connected with the fan blade shaft <NUM>, the fan blade support assembly is the above fan blade support assembly.

In some embodiments, the fan blade support assembly and the fan blade <NUM> are installed on the installing base <NUM>. In a process of enabling the air duct assembly to be detached from the air conditioner, when the fan blade <NUM> is moved in the axis direction of the shaft hole <NUM>, the fan blade shaft <NUM> does not move in the radial direction of the shaft hole <NUM> relative to the support base <NUM>. Therefore, while the air duct assembly is assembled in the air conditioner, a position in which an axis of the fan blade shaft <NUM> is positioned is not changed relative to the position before the air duct assembly is detached. At this moment, in the axis direction of the shaft hole <NUM>, the fan blade <NUM> is moved towards a direction of the drive portion <NUM>, that is, the fan blade shaft <NUM> can be connected with the drive portion <NUM>, and the assembly is convenient.

As shown in <FIG>, <FIG> and <FIG>, in an embodiment, the air duct assembly further includes the drive portion <NUM>, the fan blade shaft <NUM> is provided with the first position and the second position, when the fan blade shaft <NUM> is positioned in the first position, the fan blade shaft <NUM> is driven by the drive portion <NUM>; and when the fan blade shaft <NUM> is positioned in the second position, the fan blade shaft <NUM> is separated from the drive portion <NUM>.

In some embodiments, when the air conditioner is located in a normal working state, the fan blade shaft <NUM> is positioned in the first position, and the drive portion <NUM> drives the fan blade shaft <NUM> to be rotated. While the air duct assembly is required to be detached, and the follow-up maintenance or clean operation is performed, the fan blade shaft <NUM> is switched from the first position to the second position, at this moment, the fan blade shaft <NUM> is separated from the drive portion <NUM>, that is, the air duct assembly is detached from the air conditioner.

As shown in <FIG>, <FIG> and <FIG>, in an embodiment, the fan blade shaft <NUM> is provided with an axial hole <NUM>, the motor shaft of the drive portion <NUM> is inserted into the axial hole <NUM>, so as to connect the drive portion <NUM> and the fan blade shaft <NUM>.

In some embodiments, the motor shaft is inserted into the axial hole <NUM>, that is, the drive portion <NUM> is connected with the fan blade shaft <NUM>, the operation is simple. In addition, the fan blade shaft <NUM> and the motor shaft in the above setting are simple in structure, and it is convenient to achieve.

Certainly, in an embodiment which is not given in the drawings, an end face, towards the drive portion <NUM>, of the fan blade shaft <NUM> is provided with a plurality of convex ribs, and an end face, towards the fan blade shaft <NUM>, of the motor shaft is provided with a plurality of grooves corresponding to a plurality of the convex ribs one by one. When the fan blade shaft <NUM> is in the first position, the convex ribs are inserted into the corresponding grooves respectively, in this way, the drive portion <NUM> drives the fan blade shaft <NUM> to be rotated. When the fan blade shaft <NUM> is in the second position, the convex ribs are disconnected with the corresponding grooves, in this way, the air duct assembly is detached from the air conditioner.

As shown in <FIG>, in an embodiment, the axial hole <NUM> passes through the first shaft section <NUM> and the second shaft section <NUM>. The fan blade shaft <NUM> in the above setting is small in mass.

As shown in <FIG>, <FIG> and <FIG>, in an embodiment, the fan blade shaft <NUM> is further provided with a radial hole <NUM> communicated with the axial hole <NUM>, the air duct assembly further includes a locking part <NUM>, the locking part <NUM> is abutted against the motor shaft after passing through the radial hole <NUM>, so as to enable the motor shaft to be locked on the fan blade shaft <NUM>.

In some embodiments, the locking part <NUM> is extended into the axial hole <NUM> after passing through the radial hole <NUM>, and is abutted against the outer wall surface of the motor shaft, in this way, the motor shaft drives the fan blade shaft <NUM> to be rotated. In the above setting, the motor shaft and the fan blade shaft <NUM> are simple in structure, and it is convenient to achieve.

As shown in <FIG>, in the some embodiments, the radial hole <NUM> is disposed in the second shaft section <NUM>, the above setting is capable of shortening a length of the motor shaft. Through the above setting, because the radial hole <NUM> is installed close to the drive portion <NUM>, it is convenient to install the locking part <NUM>, so the motor shaft is conveniently locked on the fan blade shaft <NUM>.

In an embodiment, the radial hole <NUM> is a threaded hole, and the locking part <NUM> is a screw. The screw is extended into the axial hole <NUM> after screwing out of the threaded hole, and abutted against the outer wall surface of the motor shaft, that is, the motor shaft and the fan blade shaft <NUM> are connected, and the operation is simple.

In some embodiments, the outer wall surface of the motor shaft is provided with a plane parallel to the axis thereof, the screw is abutted against the plane, a contact area of the screw and the plane is large, the screw is abutted better against the outer wall surface of the motor shaft, and a phenomenon that the screw slides on the outer wall surface of the motor shaft is avoided.

As shown in <FIG>, some embodiments of the present invention provide an air conditioner. The air conditioner of some embodiments includes a housing and an air duct assembly installed in the housing, the air duct assembly is the above air duct assembly.

In an embodiment, one end, away from the fan blade shaft <NUM>, of the fan blade <NUM> is provided with a rotating shaft; one end, away from the drive portion <NUM>, of the installing base <NUM> is provided with a first installing hole; and the air duct assembly further includes an installing shaft sleeve <NUM> which is disposed in the first installing hole and fixedly connected with the installing base <NUM>, the installing shaft sleeve <NUM> is provided with a second installing hole corresponding to the rotating shaft, one end, away from the fan blade shaft <NUM>, of the rotating shaft is inserted into the second installing hole, the rotating shaft is moveably provided in an axis of the second installing hole of the installing shaft sleeve <NUM> relative to the installing base <NUM>. In the air duct assembly in the above setting, whether the fan blade shaft <NUM> is in the first position or the second position, the fan blade <NUM> is always supported by the installing shaft sleeve <NUM> and the fan blade support assembly positioned at two ends of the fan blade <NUM> together. The above setting guarantees that a position of the axis of the fan blade shaft <NUM> of the fan blade <NUM> is not changed relative to the installing base <NUM>, thereby it is guaranteed that the fan blade shaft <NUM> of the fan blade <NUM> has the same axis as the motor shaft of the drive portion <NUM> while the air duct assembly is detached from the air conditioner, or the air duct assembly is assembled in the air conditioner. Therefore, while the air duct assembly is installed in the air conditioner, the fan blade <NUM> is directly moved towards the drive portion <NUM>, that is, butting connection of the motor shaft and the fan blade shaft <NUM> is achieved, and then the screw is tightened, so the connection of the motor shaft and fan blade shaft <NUM> is completed. The coaxiality of the fan blade shaft <NUM> and the motor shaft is not required to be corrected by a professional tool during a whole installing process.

An embodiment of the present invention is applied during the production installation and after-sale detaching of the air duct assembly for maintenance or clean. While the air duct assembly is installed in the air conditioner, after the installing base <NUM> is installed in the air conditioner, a motor is installed on a motor base of the air conditioner; at this moment, because the position in which the axis of the fan blade shaft is positioned is not changed relative to the position before detaching, the fan blade shaft <NUM> is moved from the second position to the first position, that is, the fan blade shaft <NUM> is rapidly abutted to the motor shaft, the operation is convenient, and it is guaranteed that the fan blade shaft <NUM> is also rapidly abutted to the motor shaft in the case that internal space of the air conditioner is invisible; and while the air duct assembly is detached, a screw on the fan blade shaft <NUM> is detached by a screw driver, and then the fan blade <NUM> is prodded manually at an air outlet of the air conditioner, so the fan blade shaft <NUM> is moved from the first position to the second position, that is, the fan blade shaft <NUM> is disconnected with the motor shaft, and the whole air duct assembly is detached from the air conditioner. The above operation of enabling the air duct assembly to be detached from the air conditioner is rapid, and convenient.

In preconditions of ensuring the overall safety and reliable operation, some embodiments of the present invention have the following advantages: after the air duct assembly is assembled in the air conditioner, it has the good coaxiality between the fan blade shaft <NUM> and the motor shaft, the shaft runout caused by poor coaxiality between the fan blade shaft <NUM> and the motor shaft is avoided while the air conditioner is in operation, and the overall performance and service life are affected. The air conditioner of the present invention is capable of rapidly detaching and installing the air duct assembly, that is, it is achieved that the air duct assembly is rapidly detached from the air conditioner or the air duct assembly is rapidly assembled in the air conditioner, and a modularized design of the air conditioner is satisfied.

A difference between embodiment <NUM> and embodiment <NUM> is that, in the embodiment <NUM>, while the fan blade shaft <NUM> is positioned in the second position, the transition section <NUM> is abutted against the inner wall surface of the shaft hole <NUM>.

In embodiment <NUM>, the fan blade shaft <NUM> further includes the transition section <NUM> disposed between the first shaft section <NUM> and the second shaft section <NUM>, from the first shaft section <NUM> to the second shaft section <NUM>, the outer diameter of the transition section <NUM> is gradually increased, the fan blade shaft <NUM> is provided with the first position and the second position, when the fan blade shaft <NUM> is positioned in the first position, there is a gap between the outer wall surface of the first shaft section <NUM> and the inner wall surface of the shaft hole <NUM>; and when the fan blade shaft <NUM> is positioned in the second position, the transition section <NUM> is abutted against the inner wall surface of the shaft hole <NUM>.

In embodiment <NUM>, in the process of switching the fan blade shaft <NUM> from the first position to the second position, the transition section <NUM> has the above effect of automatic centering and correcting; and in addition, when the fan blade shaft <NUM> is positioned in the second position, the transition section <NUM> of the fan blade shaft <NUM> is supported by the support structure <NUM>, in this way, when the fan blade shaft <NUM> is positioned in the second position, the fan blade shaft <NUM> can not be moved along the radial direction of the shaft hole <NUM> relative to the support base <NUM>.

Other structures in embodiment <NUM> are the same as embodiment <NUM>, and are not repeatedly described here.

It can be seen from the above description that the above embodiment of the present invention achieves the following technical effects: the fan blade support assembly is applied to the air duct assembly of the air conditioner. While the fan blade shaft is connected with the drive portion, the first shaft section of the fan blade shaft is installed in the shaft hole of the support structure; because the diameter of the first shaft section is less than that of the second shaft section, and the fan blade shaft is moveably installed relative to the support base, while the fan blade shaft is connected with the drive portion, there is a gap between the outer wall surface of the first shaft section of the fan blade shaft and the inner wall surface of the shaft hole of the support structure, in this way, while the drive portion drives the fan blade shaft to be rotated, the mutual friction or collision, caused by tiny shaft runout, between the outer wall surface of the fan blade shaft and the inner wall surface of the shaft hole of the support structure can be avoided, thereby the noise is reduced, and the problem in the art known to inventors that the abnormal sound and noise are caused by the friction or collision between the fan blade shaft and the support structure is solved. In addition, the fan blade support assembly in the above setting can prevent the fan blade shaft from being worn.

Claim 1:
An air duct assembly, the air duct assembly comprises an installing base (<NUM>) wherein the air duct assembly further comprises a fan blade support assembly, a fan blade and a drive portion (<NUM>), wherein the fan blade support assembly is installed on the installing base (<NUM>) and the fan blade support assembly comprises:
a support structure (<NUM>), provided in a support base hole, and the support structure (<NUM>) is provided with a shaft hole (<NUM>); and
a fan blade shaft (<NUM>), wherein, the fan blade (<NUM>) is connected with the fan blade shaft (<NUM>), an end of the fan blade shaft (<NUM>) is connected with the drive portion (<NUM>) after passing through the shaft hole (<NUM>), wherein, the fan blade shaft (<NUM>) comprises a first shaft section (<NUM>) and a second shaft section (<NUM>) connected with the first shaft section (<NUM>), and a diameter of the first shaft section (<NUM>) is less than a diameter of the second shaft section (<NUM>);
characterized in that the fan blade support assembly comprises:
a support base (<NUM>), wherein the support base (<NUM>) comprises a support base body, and the support base body is provided with the support base hole; and the fan blade shaft (<NUM>) is movably provided relative to the support base (<NUM>), wherein when the fan blade shaft (<NUM>) is connected with the drive portion (<NUM>), there is a gap between an outer wall surface of the first shaft section (<NUM>) and an inner wall surface of the shaft hole (<NUM>).