Fan assembly and dust collector

Abstract

The invention provides a fan assembly and a dust collector. The fan assembly comprises a driving part and a rotating shaft, and the driving part is connected with the rotating shaft; the at least one impeller is connected with the rotating shaft; the backflow device is arranged on the rotating shaft; the sealing element is arranged on the backflow device and is positioned between the rotating shaft and the backflow device; at least one level of closure gap can be formed between the side, facing the rotating shaft, of the sealing piece and the outer wall of the rotating shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a fan assembly and a vacuum cleaner. Background Art

[0002] At present, in order to obtain a sealing effect, a vacuum cleaner in the related art usually has a plurality of annular sealing teeth arranged in sequence around the rotating shaft. When the sealed medium passes through the plurality of annular sealing teeth, a throttling effect is generated to achieve the purpose of preventing leakage.

[0003] However, due to the assembly, processing accuracy and vibration during operation, the annular seal teeth and the shaft body are not tightly matched, and the sealing effect is greatly reduced. Summary of the invention

[0004] The embodiments of the present invention are intended to solve at least one of the technical problems existing in the prior art.

[0005] To this end, a first aspect of an embodiment of the present invention provides a fan assembly.

[0006] A second aspect of an embodiment of the present invention provides a vacuum cleaner.

[0007] In view of this, according to a first aspect of an embodiment of the present invention, a fan assembly is provided, which includes: a driving member and a rotating shaft, the driving member being connected to the rotating shaft; at least one impeller being connected to the rotating shaft; a returner provided on the rotating shaft; a sealing member provided on the returner and located between the rotating shaft and the returner; wherein, at least one level of interception gap can be formed between the side of the sealing member facing the rotating shaft and the outer wall of the rotating shaft.

[0008] The fan assembly provided in the embodiment of the present invention includes a driving member, a rotating shaft, at least one impeller, a returner and a sealing member. Specifically, the driving member is connected to the rotating shaft, that is, the rotating shaft can rotate under the drive of the driving member.

[0009] At least one impeller is connected to the rotating shaft. It can be understood that when there are multiple impellers, the multiple impellers are arranged along the axial direction of the rotating shaft. Specifically, under the drive of the driving member, the rotating shaft can drive at least one impeller to rotate.

[0010] The return flow device is arranged on the rotating shaft. It is understood that, when there are multiple impellers, the return flow device is located between two adjacent impellers. Optionally, the multiple impellers include a first impeller and a second impeller, and the return flow device is located between the first impeller and the second impeller. It is understood that an air duct is formed between the return flow device and the inner wall of the housing of the fan assembly, and the gas sucked from the air inlet flows downward through the air duct.

[0011] The seal is arranged between the rotating shaft and the returner, and the seal is connected to the returner, so as to seal the gap between the rotating shaft and the returner, and prevent the airflow that has flowed to the downstream of the returner from passing through the gap between the rotating shaft and the returner and returning to the upstream of the returner, thereby causing the flow field to deteriorate and the performance of the fan assembly to decline.

[0012] It is understandable that the rotating shaft drives multiple impellers to rotate relative to the returner. Since the seal is connected to the returner, that is, the rotating shaft rotates relative to the seal, that is, during the operation of the fan assembly, the seal and the returner do not rotate with the rotating shaft.

[0013] However, in actual applications, due to factors such as assembly accuracy and processing accuracy, there is a gap between the side of the seal facing the shaft and the outer wall of the shaft, and vibration is generated during the operation of the fan, which increases the gap between the side of the seal facing the shaft and the outer wall of the shaft, resulting in a decrease in the sealing effect of the seal and an increase in airflow leakage losses.

[0014] At least one level of interception gap can be formed between the side of the seal facing the rotating shaft and the outer wall of the rotating shaft. The at least one level of interception gap can increase the flow resistance of the airflow in the interception gap, thereby achieving the leakage-blocking effect of this part of the airflow, and effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly, thereby leading to a decrease in the sealing effect, thereby improving the efficiency of the fan assembly while ensuring the structural reliability of the fan assembly.

[0015] Optionally, the number of impellers is two, and the fan assembly is a two-stage fan.

[0016] Optionally, the number of impellers is greater than two, and the fan assembly is a multi-stage fan.

[0017] In addition, the fan assembly provided according to the above technical solution of the present invention also has the following additional technical features:

[0018] In some technical solutions, optionally, multiple levels of interception gaps can be formed between a side of the seal facing the rotating shaft and an outer wall of the rotating shaft, and the multiple levels of interception gaps are arranged along the axial direction of the rotating shaft.

[0019] In this technical solution, a plurality of levels of interception gaps can be formed between the side of the seal facing the shaft and the outer wall of the shaft, and the plurality of levels of interception gaps are arranged along the axial direction of the shaft. In other words, the plurality of levels of interception gaps are distributed along the flow direction of the leaking airflow, so that the flow path of the airflow downstream of the recirculator in the plurality of levels of interception gaps can be effectively extended, so as to further increase the flow resistance of the airflow in the plurality of levels of interception gaps, thereby achieving the effect of blocking leakage of the airflow, effectively suppressing the problem of increased gaps and decreased sealing effect due to vibration generated during the operation of the fan assembly, and improving the efficiency of the fan assembly on the premise of ensuring the structural reliability of the fan assembly.

[0020] In some technical schemes, optionally, along the airflow direction, at least one level of interception gap includes a first interception channel, a second interception channel and a third interception channel that are connected in sequence; wherein, along the radial direction of the rotating shaft, at least a portion of the first interception channel is staggered with the second interception channel; and / or along the radial direction of the rotating shaft, at least a portion of the second interception channel is staggered with the third interception channel.

[0021] In this technical solution, along the flow direction of the airflow, that is, along the flow direction of the airflow in the interception gap of at least one level, that is, along the flow direction of the leakage airflow, the interception gap of at least one level includes a first interception channel, a second interception channel and a third interception channel, and the second interception channel is respectively connected to the first interception channel and the third interception channel.

[0022] In the radial direction of the rotating shaft, at least a portion of the first intercepting channel is staggered with the second intercepting channel. Alternatively, in the radial direction of the rotating shaft, at least a portion of the second intercepting channel is staggered with the third intercepting channel. Alternatively, in the radial direction of the rotating shaft, the first intercepting channel, the second intercepting channel and the third intercepting channel are staggered in sequence. The specific arrangement can be made according to actual needs.

[0023] Along the radial direction of the rotating shaft, since at least a part of the first intercepting channel is staggered with the second intercepting channel, and / or at least a part of the second intercepting channel is staggered with the third intercepting channel, the flow path of the airflow downstream of the recirculator in at least one level of intercepting gap can be effectively extended, the flow resistance of the airflow can be increased, and the leakage blocking effect of this part of the airflow can be achieved, and the problem of increased gap and decreased sealing effect due to vibration generated during the operation of the fan assembly can be effectively suppressed, and the efficiency of the fan assembly can be improved under the premise of ensuring the structural reliability of the fan assembly.

[0024] In addition, it is also helpful to reduce the processing accuracy and assembly accuracy of the rotating shaft and the sealing member, thereby helping to reduce the production cost of the fan assembly.

[0025] It can be understood that the airflow downstream of the reflow device and flowing in the interception gap is a leakage airflow.

[0026] In some technical solutions, optionally, at least one level of the interception gap further includes an expansion cavity, and the expansion cavity is connected to at least one of the second interception channel and the third interception channel.

[0027] In this technical solution, the interception gap defining at least one level further includes an expansion chamber, specifically, the expansion chamber is in communication with at least one of the second interception channel and the third interception channel, specifically, the expansion chamber is in communication with the second interception channel. Alternatively, the expansion chamber is in communication with the third interception channel. Alternatively, the expansion chamber is in communication with both the second interception channel and the third interception channel.

[0028] That is to say, during the process of the leakage airflow flowing in the first interception channel, the second interception channel and the third interception channel, it can enter the expansion chamber, which can effectively reduce the pressure of the leakage airflow, slow down the flow rate of the leakage airflow, and extend the path of the leakage airflow, thereby further achieving the effect of blocking leakage, ensuring a smooth flow field during the operation of the fan, and improving the operating efficiency of the fan assembly.

[0029] Optionally, in the multiple levels of interception gaps, each level of interception gap has an expansion chamber, that is, along the axial direction of the rotating shaft, the number of expansion chambers is multiple, so as to further reduce the pressure of the leakage airflow, slow down the flow rate of the leakage airflow, and extend the path of the leakage airflow, which is conducive to further blocking the leakage airflow and reducing airflow losses.

[0030] In some technical schemes, optionally, the outer wall of the rotating shaft includes multiple axial surfaces, and the multiple axial surfaces are arranged along the axial direction of the rotating shaft, and the distances between at least two axial surfaces and the rotation axis of the rotating shaft are different, so that at least one level of interception gap can be formed between the side of the seal facing the rotating shaft and the multiple axial surfaces.

[0031] In this technical solution, the outer wall of the rotating shaft is defined to include multiple axial surfaces. Specifically, the multiple axial surfaces are arranged along the axial direction of the rotating shaft. And the spacing between at least two axial surfaces and the rotation axis of the rotating shaft is different. In other words, the rotating shaft includes at least two shaft sections along the axial direction, and the outer diameters of at least two shaft sections are different. That is, the rotating shaft is a stepped shaft.

[0032] In actual applications, due to assembly accuracy and processing accuracy, there may be a gap between the side of the seal close to the rotating shaft and the outer wall of the rotating shaft, and vibration will be generated during the operation of the fan, which will increase the gap between the side of the seal facing the rotating shaft and the outer wall of the rotating shaft, resulting in a decrease in the sealing effect of the seal and an increase in the leakage loss of the airflow.

[0033] Since the distances between at least two axial surfaces and the rotation axis of the rotating shaft are different, that is, the outer diameters of at least two shaft segments are different, at least one level of interception gap is formed between the outer wall surfaces of the at least two shaft segments with different outer diameters and the side surface of the seal facing the rotating shaft. The at least one level of interception gap can increase the flow resistance of the airflow in the interception gap, thereby achieving the leakage-blocking effect for this part of the airflow, effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly, thereby leading to a decrease in the sealing effect, and improving the efficiency of the fan assembly while ensuring the structural reliability of the fan assembly.

[0034] It is understandable that, since the distances between at least two axial surfaces and the rotation axis of the shaft are different, a first blocking surface that hinders the flow of air can be formed between the at least two axial surfaces, thereby increasing the flow resistance of the leaking airflow and achieving a leakage blocking effect.

[0035] Optionally, along the axial direction of the rotating shaft, the spacing between the multiple axial surfaces and the rotation axis of the rotating shaft decreases from top to bottom. Alternatively, along the axial direction of the rotating shaft, the spacing between the multiple axial surfaces and the rotation axis of the rotating shaft increases from top to bottom. Alternatively, along the axial direction of the rotating shaft, the spacing between a part of the axial surfaces and the rotation axis of the rotating shaft decreases from top to bottom, and the spacing between another part of the axial surfaces and the rotation axis of the rotating shaft increases from top to bottom. They are not listed here one by one. They can be specifically set according to actual needs. Thereby, multiple levels of interception gaps are formed between the multiple axial surfaces and the side of the seal facing the rotating shaft.

[0036] In some technical schemes, optionally, along the air flow direction, the multiple axial surfaces include a first axial surface and a second axial surface in sequence, and the distance between the first axial surface and the rotation axis of the rotating shaft is smaller than the distance between the second axial surface and the rotation axis of the rotating shaft; the outer wall of the rotating shaft also includes a first blocking surface, which is located between the first axial surface and the second axial surface, and is connected to the first axial surface and the second axial surface.

[0037] In this technical solution, the outer wall defining the rotating shaft also includes a first blocking surface. Specifically, along the flow direction of the airflow, that is, along the flow direction of the airflow in the interception gap of at least one level, that is, along the flow direction of the leakage airflow, the multiple axial surfaces sequentially include a first axial surface and a second axial surface, wherein the spacing between the first axial surface and the rotation axis of the rotating shaft is smaller than the spacing between the second axial surface and the rotation axis of the rotating shaft.

[0038] The two ends of the first blocking surface are respectively connected to the first axial surface and the second axial surface. That is, due to the different spacings between the first axial surface and the second axial surface and the rotation axis of the rotating shaft, the first axial surface and the second axial surface form a first blocking surface.

[0039] Due to the existence of the first blocking surface, the leakage airflow can be effectively blocked from flowing in the interception gap of at least one level, thereby achieving the effect of preventing leakage.

[0040] In some technical solutions, optionally, along the axial direction of the rotating shaft, at least a portion of the first blocking surface is opposite to the first intercepting channel.

[0041] In this technical solution, it is defined that along the axial direction of the rotating shaft, at least a portion of the first blocking surface is opposite to the first intercepting channel, so that the leakage airflow flowing in from the first intercepting channel can be effectively blocked, thereby achieving the leakage blocking effect of this part of the airflow, and effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly, thereby leading to a decrease in the sealing effect, thereby improving the efficiency of the fan assembly while ensuring the structural reliability of the fan assembly.

[0042] In some technical schemes, optionally, the seal includes a sealing body and a plurality of sealing teeth, wherein the plurality of sealing teeth are formed on the sealing body along the axial direction of the rotating shaft and are located between the rotating shaft and the sealing body; the spacing between a side surface of at least two sealing teeth close to the rotating shaft and the rotation axis of the rotating shaft is different, so that at least one level of interception gap can be formed between a side surface of the plurality of sealing teeth close to the rotating shaft and the outer wall of the rotating shaft.

[0043] In this technical solution, it is defined that the seal includes a seal body and a plurality of seal teeth. Specifically, the plurality of seal teeth are located between the seal body and the rotating shaft, and the plurality of seal teeth are formed on the seal body along the axial direction of the rotating shaft.

[0044] In actual applications, due to the assembly accuracy and processing accuracy, there is a gap between the side of the multiple sealing teeth close to the rotating shaft and the outer wall surface of the rotating shaft, and vibration will be generated during the operation of the fan, which will increase the gap formed by the multiple sealing teeth facing the side of the rotating shaft and the outer wall surface of the rotating shaft, resulting in a decrease in the sealing effect of the seal and an increase in the leakage loss of the airflow.

[0045] The spacing between the side surface of at least two sealing teeth close to the rotating shaft and the rotating axis of the rotating shaft is different, that is, along the radial direction of the rotating shaft, the lengths of at least two sealing teeth are different. Thus, at least two sealing teeth with different radial lengths close to the side surface of the rotating shaft form at least one level of interception gap with the outer wall surface of the rotating shaft, and the at least one level of interception gap can increase the flow resistance of the airflow in the interception gap, thereby achieving the effect of blocking the leakage of the part of the airflow, effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly, thereby improving the efficiency of the fan assembly while ensuring the structural reliability of the fan assembly.

[0046] Optionally, along the axial direction of the shaft, the spacing between a side surface of the plurality of sealing teeth close to the shaft and the axis of rotation of the shaft decreases from top to bottom. Alternatively, along the axial direction of the shaft, the spacing between a side surface of the plurality of sealing teeth close to the shaft and the axis of rotation of the shaft increases from top to bottom. Alternatively, along the axial direction of the shaft, the spacing between a side surface of the plurality of sealing teeth close to the shaft and the axis of rotation of the shaft decreases from top to bottom, while the spacing between a side surface of the other portion of sealing teeth close to the shaft and the axis of rotation of the shaft increases from top to bottom. They are not listed here one by one. The specific configuration can be made according to actual needs. Thereby, multiple levels of interception gaps are formed between the side surface of the plurality of sealing teeth facing the shaft and the outer wall surface of the shaft.

[0047] Optionally, the sealing body and the plurality of sealing teeth are an integrated structure. It is understandable that the integrated structure has good mechanical properties, thereby improving the connection strength between the sealing body and the plurality of sealing teeth, and ensuring that the sealing element can seal the gap between the rotating shaft and the recirculator.

[0048] In addition, the integrated structure is also conducive to mass production, thereby reducing the difficulty of manufacturing the seals, improving the production efficiency of the seals, and reducing the production cost of the fan components.

[0049] In some technical schemes, optionally, along the air flow direction, the plurality of sealing teeth include a first sealing tooth and a second sealing tooth in sequence, and the expansion chamber is located between the first sealing tooth and the second sealing tooth; the first sealing tooth includes a cut-off surface and a guide surface, wherein the cut-off surface and the outer wall of the rotating shaft form a first cut-off channel, and the guide surface is connected to the cut-off surface and is located in the expansion chamber.

[0050] In the technical solution, it is defined that the plurality of sealing teeth include a first sealing tooth and a second sealing tooth. Specifically, the first sealing tooth and the second sealing tooth are arranged in sequence along the flow direction of the airflow. The expansion cavity is located between the first sealing tooth and the second sealing tooth. That is, the first sealing tooth and the second sealing tooth are arranged at intervals along the axial direction of the rotating shaft, so that an expansion cavity is formed between the first sealing tooth and the second sealing tooth.

[0051] The first sealing tooth includes a cut-off surface and a guide surface. Specifically, a first cut-off channel is formed between the cut-off surface and the outer wall surface of the rotating shaft. The guide surface is connected to the cut-off surface, and the guide surface is located in the expansion chamber.

[0052] Due to the existence of the guide surface, the leakage airflow in the expansion chamber can collide with the leakage airflow entering the second interception channel from the first interception channel under the action of the guide surface, further hindering the flow of the leakage airflow and improving the leakage blocking effect.

[0053] Optionally, a distance between a side surface of the first sealing tooth close to the rotating shaft and the rotation axis of the rotating shaft is smaller than a distance between a side surface of the second sealing tooth close to the rotating shaft and the rotation axis of the rotating shaft.

[0054] A side surface of the first sealing tooth close to the rotating shaft can form a first intercepting channel with a portion of the first axial surface, and a side surface of the second sealing tooth close to the rotating shaft can form a first intercepting channel of the next level of intercepting gap with a portion of the second axial surface.

[0055] In some technical schemes, optionally, the fan assembly also includes a shell, the shell is provided with a connected installation cavity and an air suction port, and the driving member, the rotating shaft, at least one impeller and the return flow device are located in the installation cavity; a blocking structure can also be formed between the side of the seal facing the rotating shaft and the outer wall of the rotating shaft, and along the axial direction of the rotating shaft, the blocking structure is located at one end of the interception gap of at least one level close to the air suction port, and is connected to the interception gap of at least one level.

[0056] In this technical solution, it is defined that the fan assembly also includes a housing. Specifically, the housing is provided with a connecting installation cavity and an air suction port, and a driving member, a rotating shaft, at least one impeller and a return flow device are arranged in the installation cavity. It can be understood that after the airflow enters the installation cavity from the air suction port, it is pressurized once each time it passes through an impeller, achieving a high vacuum degree and a large suction force, thereby ensuring the performance of the vacuum cleaner having the fan assembly.

[0057] Specifically, when there are multiple impellers, the multiple impellers include a first impeller and a second impeller, the reflow device is located between the first impeller and the second impeller, and along the axial direction of the rotating shaft, the air intake port, the first impeller, the reflow device, the second impeller and the driving member are arranged in sequence.

[0058] During the operation of the fan assembly, air flows into the installation cavity from the air inlet, and flows through the first impeller, the air duct between the return device and the inner wall of the shell, the second impeller and the driving member in the installation cavity.

[0059] A blocking structure can also be formed between the side of the seal facing the rotating shaft and the outer wall of the rotating shaft. The blocking structure is located at one end of the interception gap of at least one level close to the air suction port, that is, the blocking structure is located at the leakage end of the interception gap of at least one level.

[0060] The blocking structure is connected to the interception gap of at least one level, that is, the leakage airflow enters the blocking structure after flowing through the interception gap of at least one level to further intercept the leakage airflow, that is, the leakage airflow is blocked again at the final leakage end, thereby further achieving the leakage blocking effect of the leakage airflow, improving the sealing effect between the rotating shaft and the return device, and improving the efficiency of the fan assembly.

[0061] Optionally, the blocking structure may be located at the end of the rotating shaft facing the air inlet, or may be located at a position close to the end of the rotating shaft. The blocking structure may be specifically arranged according to actual needs.

[0062] In some technical schemes, optionally, the blocking structure includes a blocking cavity; a second blocking surface is provided on the side of the seal facing the rotating shaft, and along the axial direction of the rotating shaft, the second blocking surface is opposite to at least one level of interception gap; the outer wall of the rotating shaft includes a chamfered surface, and the chamfered surface and the second blocking surface are enclosed to form a blocking structure.

[0063] In this technical solution, it is defined that the blocking structure includes a blocking cavity. Specifically, a second blocking surface is provided on the side of the seal facing the rotating shaft. Along the axial direction of the rotating shaft, the second blocking surface is opposite to at least one level of interception gap, so that the leakage airflow can be blocked again at the leakage end, thereby improving the leakage blocking effect on the leakage airflow.

[0064] The outer wall of the rotating shaft includes a chamfered surface, and it can be understood that the chamfered surface is an inclined surface. The chamfered surface and the second blocking surface enclose a blocking cavity, and the leakage airflow enters the blocking cavity after passing through at least one level of interception gap, and can swirl in the blocking cavity to prevent the leakage airflow from flowing out.

[0065] Optionally, the chamfered surface is located at the end of the rotating shaft facing the air inlet, and the seal is arranged near the end of the rotating shaft facing the air inlet, so that the second blocking surface of the seal and the chamfered surface of the rotating shaft can enclose and form a blocking cavity located at the end of the rotating shaft. In addition, by arranging the chamfered surface at the end of the rotating shaft, it is also convenient for the rapid installation of the seal.

[0066] Optionally, the second blocking surface extends radially along the shaft to the chamfered surface, so that the seal can be limited in the axial direction to ensure the installation stability of the seal, thereby ensuring that the seal effectively seals the gap between the shaft and the returner.

[0067] In some technical solutions, optionally, the number of impellers is at least two, at least two impellers are arranged along the axial direction of the rotating shaft, and a recirculator is provided between two adjacent impellers.

[0068] In this technical solution, the number of impellers is limited to at least two, specifically, at least two impellers are arranged along the axial direction of the rotating shaft. That is to say, under the drive of the driving member, the rotating shaft can drive at least two impellers to rotate.

[0069] The return flow device is located between two adjacent impellers. Optionally, the plurality of impellers include a first impeller and a second impeller, and the return flow device is located between the first impeller and the second impeller. It is understood that an air duct is formed between the return flow device and the inner wall of the housing of the fan assembly, and the gas sucked from the air inlet flows downward through the air duct.

[0070] Optionally, the seal includes a flexible member. That is, the seal is made of a flexible material, so that it can ensure the sealing effect between the shaft and the returner, reduce airflow leakage, ensure the efficiency of the fan assembly, and prevent the seal from rigidly colliding with the shaft during the operation of the fan assembly, reduce the friction loss and noise between the seal and the shaft, extend the service life of the shaft and the seal, and ensure the structural reliability of the fan assembly.

[0071] Optionally, the flexible member includes a silicone member or a rubber member.

[0072] Optionally, the fan assembly further comprises a housing, the housing is provided with a connecting installation cavity and an air suction port, and a driving member, a rotating shaft, a plurality of impellers, a returner and a sealing member are arranged in the installation cavity. It is understandable that after the airflow enters the installation cavity from the air suction port, it is pressurized once each time it passes through an impeller, achieving a high vacuum degree and a large suction force, thereby ensuring the performance of the vacuum cleaner having the fan assembly.

[0073] Specifically, the plurality of impellers include a first impeller and a second impeller, and along the axial direction of the rotating shaft, the air inlet, the first impeller, the return flow device, the second impeller and the driving member are arranged in sequence.

[0074] During the operation of the fan, air flows into the installation cavity from the air inlet, and flows through the first impeller, the air duct between the return device and the inner wall of the shell, the second impeller and the driving member in the installation cavity.

[0075] According to a second aspect of the present invention, there is provided a vacuum cleaner, comprising a fan assembly as provided by any of the above technical solutions, and thus having all the beneficial technical effects of the fan assembly, which will not be described in detail herein.

[0076] Additional aspects and advantages according to the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0078] Figure 1 One of the partial structural schematic diagrams of a fan assembly according to an embodiment of the present invention is shown;

[0079] Figure 2 A second partial structural schematic diagram of a fan assembly according to an embodiment of the present invention is shown;

[0080] Figure 3 A third partial structural schematic diagram of a fan assembly according to an embodiment of the present invention is shown;

[0081] Figure 4 A schematic structural diagram of a fan assembly according to an embodiment of the present invention is shown.

[0082] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0083] 100 fan assembly, 110 driving member, 120 rotating shaft, 121 axial surface, 122 first axial surface, 123 second axial surface, 124 first blocking surface, 130 impeller, 140 return flow device, 150 sealing member, 151 sealing body, 152 sealing teeth, 153 first sealing teeth, 154 second sealing teeth, 155 expansion chamber, 156 intercepting surface, 157 guiding surface, 160 intercepting gap, 161 first intercepting channel, 162 second intercepting channel, 163 third intercepting channel, 210 housing, 211 mounting cavity, 212 air suction port, 230 rotating axis, 240 blocking structure, 241 second blocking surface, 242 chamfered surface, 243 blocking cavity. DETAILED DESCRIPTION

[0084] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0085] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0086] Refer to the following Figures 1 to 4 The fan assembly 100 and the dust collector provided according to some embodiments of the present invention are described.

[0087] In one embodiment according to the present application, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a fan assembly 100 is proposed, and the fan assembly 100 includes: a driving member 110 and a rotating shaft 120, the driving member 110 is connected to the rotating shaft 120; at least one impeller 130 is connected to the rotating shaft 120; a return flow device 140 is arranged on the rotating shaft 120; a sealing member 150 is arranged on the return flow device 140 and is located between the rotating shaft 120 and the return flow device 140; wherein, at least one level of interception gap 160 can be formed between the side of the sealing member 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120.

[0088] The fan assembly 100 provided in the embodiment of the present invention includes a driving member 110, a rotating shaft 120, at least one impeller 130, a return flow device 140 and a seal 150. Specifically, the driving member 110 is connected to the rotating shaft 120, that is, the rotating shaft 120 can rotate under the drive of the driving member 110.

[0089] At least one impeller 130 is connected to the rotating shaft 120. It is understandable that when there are multiple impellers 130, the multiple impellers 130 are arranged along the axial direction of the rotating shaft 120. Specifically, under the drive of the driving member 110, the rotating shaft 120 can drive at least one impeller 130 to rotate.

[0090] The return flow device 140 is disposed on the rotating shaft 120. It is understood that, when there are multiple impellers 130, the return flow device 140 is located between two adjacent impellers 130. Optionally, the multiple impellers 130 include a first impeller and a second impeller, and the return flow device 140 is located between the first impeller and the second impeller. It is understood that an air duct is formed between the return flow device 140 and the inner wall of the housing 210 of the fan assembly 100, and the gas sucked in from the air inlet 212 flows downward through the air duct.

[0091] The seal 150 is disposed between the rotating shaft 120 and the returner 140, and the seal 150 is connected to the returner 140. Thus, the gap between the rotating shaft 120 and the returner 140 is sealed to prevent the airflow that has flowed to the downstream of the returner 140 from passing through the gap between the rotating shaft 120 and the returner 140 and returning to the upstream of the returner 140, thereby causing the flow field to deteriorate and the performance of the fan assembly 100 to decline.

[0092] It can be understood that the rotating shaft 120 drives the multiple impellers 130 to rotate relative to the return flow device 140. Since the seal 150 is connected to the return flow device 140, that is, the rotating shaft 120 rotates relative to the seal 150, that is, during the operation of the fan assembly 100, the seal 150 and the return flow device 140 do not rotate with the rotating shaft 120.

[0093] In actual applications, due to the assembly accuracy and processing accuracy, there is a gap between the side of the seal 150 facing the shaft 120 and the outer wall of the shaft 120, and vibration is generated during the operation of the fan, which increases the gap between the side of the seal 150 facing the shaft 120 and the outer wall of the shaft 120, resulting in a decrease in the sealing effect of the seal 150 and an increase in the leakage loss of the airflow.

[0094] At least one level of interception gap 160 can be formed between the side of the seal 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120. The at least one level of interception gap 160 can increase the flow resistance of the airflow in the interception gap 160, thereby achieving the leakage-blocking effect of this part of the airflow, and effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly 100, thereby leading to a decrease in the sealing effect, thereby improving the efficiency of the fan assembly 100 while ensuring the structural reliability of the fan assembly 100.

[0095] Optionally, the number of impellers 130 is two, and the fan assembly 100 is a two-stage fan.

[0096] Optionally, the number of impellers 130 is greater than two, and the fan assembly 100 is a multi-stage fan.

[0097] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, a plurality of levels of interception gaps 160 can be formed between the side of the seal 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120 , and the plurality of levels of interception gaps 160 are arranged along the axial direction of the rotating shaft 120 .

[0098] In this embodiment, a plurality of levels of interception gaps 160 can be formed between the side of the seal 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120, and the plurality of levels of interception gaps 160 are arranged along the axial direction of the rotating shaft 120. In other words, the plurality of levels of interception gaps 160 are distributed along the flow direction of the leaking airflow, so that the flow path of the airflow downstream of the returner 140 in the plurality of levels of interception gaps 160 can be effectively extended, so as to further increase the flow resistance of the airflow in the plurality of levels of interception gaps 160, thereby achieving the effect of blocking leakage of the airflow, effectively suppressing the problem that the gap increases due to vibration generated during the operation of the fan assembly 100, thereby improving the efficiency of the fan assembly 100 while ensuring the structural reliability of the fan assembly 100.

[0099] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, along the air flow direction, at least one level of the interception gap 160 includes a first interception channel 161, a second interception channel 162 and a third interception channel 163 that are connected in sequence; wherein, along the radial direction of the rotating shaft 120, at least a portion of the first interception channel 161 is staggered with the second interception channel 162; and / or along the radial direction of the rotating shaft 120, at least a portion of the second interception channel 162 is staggered with the third interception channel 163.

[0100] In this embodiment, along the flow direction of the airflow, that is, along the flow direction of the airflow in the interception gap 160 of at least one level, that is, along the flow direction of the leakage airflow, the interception gap 160 of at least one level includes a first interception channel 161, a second interception channel 162 and a third interception channel 163, and the second interception channel 162 is respectively connected to the first interception channel 161 and the third interception channel 163.

[0101] Along the radial direction of the rotating shaft 120, at least a portion of the first intercepting channel 161 is staggered with the second intercepting channel 162. Alternatively, along the radial direction of the rotating shaft 120, at least a portion of the second intercepting channel 162 is staggered with the third intercepting channel 163. Alternatively, along the radial direction of the rotating shaft 120, the first intercepting channel 161, the second intercepting channel 162 and the third intercepting channel 163 are staggered in sequence. The specific configuration can be made according to actual needs.

[0102] Along the radial direction of the rotating shaft 120, at least a portion of the first intercepting channel 161 is staggered with the second intercepting channel 162, and / or at least a portion of the second intercepting channel 162 is staggered with the third intercepting channel 163. Thus, the flow path of the airflow downstream of the returner 140 in at least one level of intercepting gap 160 can be effectively extended, the flow resistance of the airflow is increased, and the leakage blocking effect of the part of the airflow is achieved, and the problem of increased gap and decreased sealing effect due to vibration generated during the operation of the fan assembly 100 is effectively suppressed, and the efficiency of the fan assembly 100 is improved under the premise of ensuring the structural reliability of the fan assembly 100.

[0103] In addition, it is also helpful to reduce the processing accuracy and assembly accuracy of the rotating shaft 120 and the sealing member 150 , thereby helping to reduce the production cost of the fan assembly 100 .

[0104] Figure 2 and Figure 3 In the embodiment, the arrows in the interception gap 160 of at least one level are the flow directions of the leakage airflow. It can be understood that the airflow flowing in the interception gap 160 downstream of the reflow returner 140 is the leakage airflow.

[0105] like Figure 1 and Figure 2 As shown, in some embodiments, optionally, at least one level of the intercepting gap 160 further includes an expansion chamber 155 , and the expansion chamber 155 is in communication with at least one of the second intercepting channel 162 and the third intercepting channel 163 .

[0106] In this embodiment, the interception gap 160 defining at least one level further includes an expansion chamber 155. Specifically, the expansion chamber 155 is in communication with at least one of the second interception channel 162 and the third interception channel 163. Specifically, the expansion chamber 155 is in communication with the second interception channel 162. Alternatively, the expansion chamber 155 is in communication with the third interception channel 163. Alternatively, the expansion chamber 155 is in communication with both the second interception channel 162 and the third interception channel 163.

[0107] That is to say, during the process of the leakage airflow flowing in the first interception channel 161, the second interception channel 162 and the third interception channel 163, the leakage airflow can enter the expansion chamber 155, effectively reducing the pressure of the leakage airflow, slowing down the flow rate of the leakage airflow, and extending the path of the leakage airflow, thereby further achieving the effect of blocking leakage, ensuring a smooth flow field during the operation of the fan, and improving the operating efficiency of the fan assembly 100.

[0108] Optionally, in the multiple levels of interception gaps 160, each level of interception gap 160 has an expansion chamber 155, that is, along the axial direction of the rotating shaft 120, the number of expansion chambers 155 is multiple, so as to further reduce the pressure of the leakage airflow, slow down the flow rate of the leakage airflow, and extend the path of the leakage airflow, which is conducive to further blocking the leakage airflow and reducing airflow losses.

[0109] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, the outer wall of the rotating shaft 120 includes a plurality of axial surfaces 121, and the plurality of axial surfaces 121 are arranged along the axial direction of the rotating shaft 120, and the spacing between at least two axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 is different, so that at least one level of interception gap 160 can be formed between the seal 150 facing one side of the rotating shaft 120 and the plurality of axial surfaces 121.

[0110] In this embodiment, the outer wall defining the rotating shaft 120 includes a plurality of axial surfaces 121. Specifically, the plurality of axial surfaces 121 are arranged along the axial direction of the rotating shaft 120. Moreover, the spacing between at least two axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 is different. In other words, the rotating shaft 120 includes at least two shaft sections along the axial direction, and the outer diameters of at least the two shaft sections are different. In other words, the rotating shaft 120 is a stepped shaft.

[0111] In actual applications, due to the assembly accuracy and processing accuracy, there is a gap between the side of the seal 150 close to the rotating shaft 120 and the outer wall surface of the rotating shaft 120, and vibration will be generated during the operation of the fan, so that the gap formed by the multiple sealing teeth 152 facing the side of the rotating shaft 120 and the outer wall surface of the rotating shaft 120 will increase, resulting in a decrease in the sealing effect of the seal 150 and an increase in the leakage loss of the airflow.

[0112] Since the spacing between at least two axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 is different, that is, the outer diameters of at least two shaft segments are different, at least one level of interception gap 160 is formed between the outer wall surface of at least two shaft segments with different outer diameters and the side of the seal 150 facing the rotating shaft 120. The at least one level of interception gap 160 can increase the flow resistance of the airflow in the interception gap 160, thereby achieving the leakage-blocking effect of this part of the airflow, and effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly 100, thereby leading to a decrease in the sealing effect, thereby improving the efficiency of the fan assembly 100 while ensuring the structural reliability of the fan assembly 100.

[0113] It can be understood that due to the different distances between at least two axial surfaces 121 and the rotation axis 230 of the rotating shaft 120, a first blocking surface 124 that hinders the flow of air can be formed between at least two axial surfaces 121, thereby increasing the flow resistance of the leaking airflow and achieving a leakage blocking effect.

[0114] Optionally, along the axial direction of the rotating shaft 120, the spacing between the multiple axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 decreases from top to bottom. Alternatively, along the axial direction of the rotating shaft 120, the spacing between the multiple axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 increases from top to bottom. Alternatively, along the axial direction of the rotating shaft 120, the spacing between a part of the axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 decreases from top to bottom, and the spacing between another part of the axial surfaces 121 and the rotation axis 230 of the rotating shaft 120 increases from top to bottom. They are not listed here one by one. They can be specifically set according to actual needs. Thereby, multiple levels of interception gaps 160 are formed on the side of the rotating shaft 120 facing the multiple axial surfaces 121 and the seal 150.

[0115] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, along the air flow direction, the multiple axial surfaces 121 include a first axial surface 122 and a second axial surface 123 in sequence, and the distance between the first axial surface 122 and the rotation axis 230 of the rotating shaft 120 is smaller than the distance between the second axial surface 123 and the rotation axis 230 of the rotating shaft 120; the outer wall of the rotating shaft 120 also includes a first blocking surface 124, and the first blocking surface 124 is located between the first axial surface 122 and the second axial surface 123, and is connected to the first axial surface 122 and the second axial surface 123.

[0116] In this embodiment, the outer wall defining the rotating shaft 120 also includes a first blocking surface 124. Specifically, along the flow direction of the airflow, that is, along the flow direction of the airflow in the interception gap 160 of at least one level, that is, along the flow direction of the leakage airflow, the multiple axial surfaces 121 sequentially include a first axial surface 122 and a second axial surface 123, wherein the distance between the first axial surface 122 and the rotation axis 230 of the rotating shaft 120 is smaller than the distance between the second axial surface 123 and the rotation axis 230 of the rotating shaft 120.

[0117] The two ends of the first blocking surface 124 are respectively connected to the first axial surface 122 and the second axial surface 123 , that is, due to the different distances between the first axial surface 122 and the second axial surface 123 and the rotation axis 230 of the rotating shaft 120 , the first axial surface 122 and the second axial surface 123 form a first blocking surface 124 .

[0118] Due to the existence of the first blocking surface 124, the leakage airflow can be effectively blocked from flowing in at least one level of interception gap 160, thereby achieving a leakage blocking effect.

[0119] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, along the axial direction of the rotating shaft 120 , at least a portion of the first blocking surface 124 is opposite to the first intercepting channel 161 .

[0120] In this embodiment, it is defined that along the axial direction of the rotating shaft 120, at least a portion of the first blocking surface 124 is opposite to the first intercepting channel 161, so that the leakage airflow flowing in from the first intercepting channel 161 can be effectively blocked, thereby achieving the effect of blocking the leakage of this part of the airflow, and effectively suppressing the problem that the gap increases due to vibration generated during the operation of the fan assembly 100, thereby causing the sealing effect to decrease, thereby improving the efficiency of the fan assembly 100 while ensuring the structural reliability of the fan assembly 100.

[0121] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, the seal 150 includes a sealing body 151 and a plurality of sealing teeth 152, wherein the plurality of sealing teeth 152 are formed on the sealing body 151 along the axial direction of the rotating shaft 120 and are located between the rotating shaft 120 and the sealing body 151; the spacing between a side surface of at least two sealing teeth 152 close to the rotating shaft 120 and the rotation axis 230 of the rotating shaft 120 is different, so that at least one level of interception gap 160 can be formed between a side surface of the plurality of sealing teeth 152 close to the rotating shaft 120 and the outer wall of the rotating shaft 120.

[0122] In this embodiment, the seal 150 is defined to include a seal body 151 and a plurality of seal teeth 152 . Specifically, the plurality of seal teeth 152 are located between the seal body 151 and the rotating shaft 120 , and the plurality of seal teeth 152 are formed on the seal body 151 at intervals along the axial direction of the rotating shaft 120 .

[0123] In actual applications, due to the assembly accuracy and processing accuracy, a gap may exist between the side of the multiple sealing teeth 152 close to the rotating shaft 120 and the outer wall surface of the rotating shaft 120, and vibration may be generated during the operation of the fan, which may increase the gap between the multiple sealing teeth 152 and the outer wall surface of the rotating shaft 120 facing the side of the rotating shaft 120, thereby reducing the sealing effect of the seal 150 and increasing the leakage loss of the airflow.

[0124] The spacing between the side of at least two sealing teeth 152 close to the rotating shaft 120 and the rotation axis 230 of the rotating shaft 120 is different, that is, along the radial direction of the rotating shaft 120, the lengths of at least two sealing teeth 152 are different. Thus, at least two sealing teeth 152 with different radial lengths close to the side of the rotating shaft 120 form at least one level of interception gap 160 with the outer wall surface of the rotating shaft 120. The at least one level of interception gap 160 can increase the flow resistance of the airflow in the interception gap 160, thereby achieving the effect of blocking leakage of the part of the airflow, effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly 100, thereby improving the efficiency of the fan assembly 100 while ensuring the structural reliability of the fan assembly 100.

[0125] Optionally, along the axial direction of the rotating shaft 120, the spacing between the side of the plurality of sealing teeth 152 close to the rotating shaft 120 and the rotating axis 230 of the rotating shaft 120 decreases from top to bottom. Alternatively, along the axial direction of the rotating shaft 120, the spacing between the side of the plurality of sealing teeth 152 close to the rotating shaft 120 and the rotating axis 230 of the rotating shaft 120 increases from top to bottom. Alternatively, along the axial direction of the rotating shaft 120, the spacing between the side of a portion of the sealing teeth 152 close to the rotating shaft 120 and the rotating axis 230 of the rotating shaft 120 decreases from top to bottom, and the spacing between the side of the other portion of the sealing teeth 152 close to the rotating shaft 120 and the rotating axis 230 of the rotating shaft 120 increases from top to bottom. They are not listed here one by one. They can be specifically set according to actual needs. Thus, multiple levels of interception gaps 160 are formed between the side of the plurality of sealing teeth 152 facing the rotating shaft 120 and the outer wall surface of the rotating shaft 120.

[0126] Optionally, the sealing body 151 and the plurality of sealing teeth 152 are an integral structure. It is understood that the integral structure has good mechanical properties, thereby improving the connection strength between the sealing body 151 and the plurality of sealing teeth 152, and ensuring that the sealing element 150 can seal the gap between the rotating shaft 120 and the reflow device 140.

[0127] In addition, the integrated structure is also conducive to mass production, thereby reducing the difficulty of manufacturing the seal 150 , improving the production efficiency of the seal 150 , and reducing the production cost of the fan assembly 100 .

[0128] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, optionally, along the air flow direction, the plurality of sealing teeth 152 include a first sealing tooth 153 and a second sealing tooth 154 in sequence, and the expansion chamber 155 is located between the first sealing tooth 153 and the second sealing tooth 154; the first sealing tooth 153 includes a cut-off surface 156 and a guide surface 157, wherein the cut-off surface 156 and the outer wall of the rotating shaft 120 form a first cut-off channel 161, and the guide surface 157 is connected to the cut-off surface 156 and is located in the expansion chamber 155.

[0129] In this embodiment, it is defined that the plurality of sealing teeth 152 include a first sealing tooth 153 and a second sealing tooth 154. Specifically, the first sealing tooth 153 and the second sealing tooth 154 are arranged in sequence along the flow direction of the airflow. The expansion cavity 155 is located between the first sealing tooth 153 and the second sealing tooth 154. That is, the first sealing tooth 153 and the second sealing tooth 154 are arranged at intervals along the axial direction of the rotating shaft 120, so that the expansion cavity 155 is formed between the first sealing tooth 153 and the second sealing tooth 154.

[0130] The first sealing tooth 153 includes a cut-off surface 156 and a guide surface 157 . Specifically, a first cut-off channel 161 is formed between the cut-off surface 156 and the outer wall surface of the rotating shaft 120 . The guide surface 157 is connected to the cut-off surface 156 , and the guide surface 157 is located in the expansion chamber 155 .

[0131] Due to the existence of the guide surface 157, the leakage airflow in the expansion chamber 155 can collide with the leakage airflow entering the second intercepting channel 162 from the first intercepting channel 161 under the action of the guide surface 157, further hindering the flow of the leakage airflow and improving the leakage blocking effect.

[0132] Optionally, the distance between a side surface of the first sealing tooth 153 close to the rotating shaft 120 and the rotation axis 230 of the rotating shaft 120 is smaller than the distance between a side surface of the second sealing tooth 154 close to the rotating shaft 120 and the rotation axis 230 of the rotating shaft 120 .

[0133] The side of the first sealing tooth 153 close to the rotating shaft 120 can form a first intercepting channel 161 with a part of the first axial surface 122, and the side of the second sealing tooth 154 close to the rotating shaft 120 can form a first intercepting channel 161 of the next level of intercepting gap 160 with a part of the second axial surface 123.

[0134] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the fan assembly 100 also includes a shell 210, the shell 210 is provided with a connected installation cavity 211 and an air suction port 212, the driving member 110, the rotating shaft 120, at least one impeller 130 and the return flow device 140 are located in the installation cavity 211; a blocking structure 240 can also be formed between the side of the sealing member 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120, and along the axial direction of the rotating shaft 120, the blocking structure 240 is located at one end of the interception gap 160 of at least one level close to the air suction port 212, and is connected to the interception gap 160 of at least one level.

[0135] In this embodiment, it is defined that the fan assembly 100 further includes a housing 210. Specifically, the housing 210 is provided with a connecting mounting cavity 211 and an air suction port 212, and the driving member 110, the rotating shaft 120, at least one impeller 130 and the return flow device 140 are arranged in the mounting cavity 211. It can be understood that after the airflow enters the mounting cavity 211 from the air suction port 212, it is pressurized once each time it passes through an impeller 130, achieving a high vacuum degree and a large suction force, thereby ensuring the performance of the vacuum cleaner having the fan assembly 100.

[0136] Specifically, when there are multiple impellers 130, the multiple impellers 130 include a first impeller and a second impeller, the return flow device 140 is located between the first impeller and the second impeller, and along the axial direction of the rotating shaft 120, the air intake port 212, the first impeller, the return flow device 140, the second impeller and the driving member 110 are arranged in sequence.

[0137] During the operation of the fan assembly 100 , air flows into the installation cavity 211 from the air inlet 212 , and flows in the installation cavity 211 through the first impeller, the air duct between the returner 140 and the inner wall of the shell 210 , the second impeller and the driving member 110 .

[0138] A blocking structure 240 can also be formed between the side of the seal 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120. The blocking structure 240 is located at one end of the interception gap 160 of at least one level close to the air suction port 212, that is, the blocking structure 240 is located at the leakage end of the interception gap 160 of at least one level.

[0139] The blocking structure 240 is connected to at least one level of interception gap 160, that is, the leakage airflow enters the blocking structure 240 after flowing through at least one level of interception gap 160, so as to further intercept the leakage airflow, that is, to block the leakage airflow again at the final leakage end, thereby further achieving the leakage blocking effect of the leakage airflow, improving the sealing effect between the rotating shaft 120 and the return flow device 140, and improving the efficiency of the fan assembly 100.

[0140] Optionally, the blocking structure 240 may be located at the end of the rotating shaft 120 facing the air inlet 212, or may be located at a position close to the end of the rotating shaft 120. The blocking structure 240 may be specifically arranged according to actual needs.

[0141] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the blocking structure 240 includes a blocking cavity 243; a second blocking surface 241 is provided on the side of the seal 150 facing the rotating shaft 120, and along the axial direction of the rotating shaft 120, the second blocking surface 241 is opposite to at least one level of interception gap 160; the outer wall of the rotating shaft 120 includes a chamfered surface 242, and the chamfered surface 242 and the second blocking surface 241 enclose a blocking cavity 243.

[0142] In this embodiment, the blocking structure 240 is defined to include a blocking cavity 243. Specifically, a second blocking surface 241 is provided on the side of the seal 150 facing the rotating shaft 120. Along the axial direction of the rotating shaft 120, the second blocking surface 241 is opposite to at least one level of intercepting gap 160, so that the leaking airflow can be blocked again at the leakage end, thereby improving the leakage blocking effect on the leaking airflow.

[0143] The outer wall of the rotating shaft 120 includes a chamfered surface 242. It can be understood that the chamfered surface 242 is an inclined surface. The chamfered surface 242 and the second blocking surface 241 enclose a blocking cavity 243. After the leakage airflow passes through at least one level of interception gap 160, it enters the blocking cavity 243 and can swirl in the blocking cavity 243 to prevent the leakage airflow from flowing out.

[0144] Optionally, the chamfered surface 242 is located at the end of the rotating shaft 120 facing the air suction port 212, and the seal 150 is arranged close to the end of the rotating shaft 120 facing the air suction port 212, so that the second blocking surface 241 of the seal 150 and the chamfered surface 242 of the rotating shaft 120 can enclose to form a blocking cavity 243 located at the end of the rotating shaft 120.

[0145] At the same time, since the end of the rotating shaft 120 is provided with a chamfered surface 242, it is also convenient to install the sealing member 150, which is beneficial to improve the installation efficiency.

[0146] Optionally, the second blocking surface 241 extends radially along the rotating shaft 120 to the chamfered surface 242, so as to limit the seal 150 in the axial direction, ensure the installation stability of the seal 150, and further ensure that the seal 150 effectively seals the gap between the rotating shaft 120 and the return flow device 140.

[0147] like Figure 3 As shown, in some embodiments, optionally, the number of the impellers 130 is at least two, at least two impellers 130 are arranged along the axial direction of the rotating shaft 120 , and a return flow device 140 is provided between two adjacent impellers 130 .

[0148] In this embodiment, the number of the impellers 130 is limited to at least two, specifically, at least two impellers 130 are arranged along the axial direction of the rotating shaft 120. That is, under the drive of the driving member 110, the rotating shaft 120 can drive at least two impellers 130 to rotate.

[0149] The return flow device 140 is located between two adjacent impellers 130. Optionally, the plurality of impellers 130 include a first impeller and a second impeller, and the return flow device 140 is located between the first impeller and the second impeller. It is understood that an air duct is formed between the return flow device 140 and the inner wall of the housing 210 of the fan assembly 100, and the gas sucked in from the air inlet 212 flows downward through the air duct.

[0150] Optionally, the seal 150 includes a flexible member. That is, the seal 150 is made of a flexible material, so that it can ensure the sealing effect between the rotating shaft 120 and the returner 140, reduce airflow leakage, ensure the efficiency of the fan assembly 100, and prevent the seal 150 from rigidly colliding with the rotating shaft 120 during the operation of the fan assembly 100, reduce the friction loss and noise between the seal 150 and the rotating shaft 120, extend the service life of the rotating shaft 120 and the seal 150, and ensure the structural reliability of the fan assembly 100.

[0151] Optionally, the flexible member includes a silicone member or a rubber member.

[0152] like Figure 3 As shown, optionally, the fan assembly 100 further includes a housing 210, the housing 210 is provided with a connecting mounting cavity 211 and an air suction port 212, and the driving member 110, the rotating shaft 120, a plurality of impellers 130, a returner 140 and a sealing member 150 are arranged in the mounting cavity 211. It can be understood that after the airflow enters the mounting cavity 211 from the air suction port 212, it is pressurized once each time it passes through an impeller 130, achieving a high vacuum degree and a large suction force, thereby ensuring the performance of the vacuum cleaner having the fan assembly 100.

[0153] Specifically, the plurality of impellers 130 include a first impeller and a second impeller, and the air inlet 212, the first impeller, the return flow device 140, the second impeller and the driving member 110 are sequentially arranged along the axial direction of the rotating shaft 120. During the operation of the fan, the airflow enters the installation cavity 211 from the air inlet 212, and flows in the installation cavity 211 through the first impeller, the air duct between the return flow device 140 and the inner wall of the housing 210, the second impeller and the driving member 110.

[0154] According to a second aspect of the present invention, there is provided a vacuum cleaner, comprising a fan assembly 100 as provided in any of the above embodiments, and thus having all the beneficial technical effects of the fan assembly 100, which will not be described in detail herein.

[0155] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, the fan assembly 100 includes a driving member 110, a rotating shaft 120, at least one impeller 130, a return flow device 140 and a sealing member 150. Specifically, the driving member 110 is connected to the rotating shaft 120, that is, the rotating shaft 120 can rotate under the drive of the driving member 110.

[0156] At least one impeller 130 is connected to the rotating shaft 120. It is understandable that when there are multiple impellers 130, the multiple impellers 130 are arranged along the axial direction of the rotating shaft 120. Specifically, under the drive of the driving member 110, the rotating shaft 120 can drive at least one impeller 130 to rotate.

[0157] The return flow device 140 is disposed on the rotating shaft 120. It is understood that, when there are multiple impellers 130, the return flow device 140 is located between two adjacent impellers 130. Optionally, the multiple impellers 130 include a first impeller and a second impeller, and the return flow device 140 is located between the first impeller and the second impeller. It is understood that an air duct is formed between the return flow device 140 and the inner wall of the housing 210 of the fan assembly 100, and the gas sucked in from the air inlet 212 flows downward through the air duct.

[0158] The seal 150 is disposed between the rotating shaft 120 and the returner 140, and the seal 150 is connected to the returner 140. Thus, the gap between the rotating shaft 120 and the returner 140 is sealed to prevent the airflow that has flowed to the downstream of the returner 140 from passing through the gap between the rotating shaft 120 and the returner 140 and returning to the upstream of the returner 140, thereby causing the flow field to deteriorate and the performance of the fan assembly 100 to decline.

[0159] It can be understood that the rotating shaft 120 drives the multiple impellers 130 to rotate relative to the return flow device 140. Since the seal 150 is connected to the return flow device 140, that is, the rotating shaft 120 rotates relative to the seal 150, that is, during the operation of the fan assembly 100, the seal 150 and the return flow device 140 do not rotate with the rotating shaft 120.

[0160] In actual applications, due to the assembly accuracy and processing accuracy, there is a gap between the side of the seal 150 facing the shaft 120 and the outer wall of the shaft 120, and vibration is generated during the operation of the fan, which increases the gap between the side of the seal 150 facing the shaft 120 and the outer wall of the shaft 120, resulting in a decrease in the sealing effect of the seal 150 and an increase in the leakage loss of the airflow.

[0161] At least one level of interception gap 160 can be formed between the side of the seal 150 facing the rotating shaft 120 and the outer wall of the rotating shaft 120. The at least one level of interception gap 160 can increase the flow resistance of the airflow in the interception gap 160, thereby achieving the leakage-blocking effect of this part of the airflow, and effectively suppressing the problem of increased gap due to vibration generated during the operation of the fan assembly 100, thereby leading to a decrease in the sealing effect, thereby improving the efficiency of the fan assembly 100 while ensuring the structural reliability of the fan assembly 100.

[0162] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0163] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0164] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan assembly, It is characterized in that include: A driving member and a rotating shaft, wherein the driving member is connected to the rotating shaft; at least one impeller connected to the rotating shaft; A return device, arranged on the rotating shaft; A sealing member, provided on the reflux device and located between the rotating shaft and the reflux device; Wherein, at least one level of interception gap can be formed between the side of the sealing member facing the rotating shaft and the outer wall of the rotating shaft.

2. The fan assembly according to claim 1, It is characterized in that Multiple levels of interception gaps can be formed between the side of the sealing member facing the rotating shaft and the outer wall of the rotating shaft, and the multiple levels of interception gaps are arranged along the axial direction of the rotating shaft.

3. The fan assembly according to claim 1 or 2, It is characterized in that Along the airflow direction, the interception gap of at least one level includes a first interception channel, a second interception channel and a third interception channel which are connected in sequence; Wherein, along the radial direction of the rotating shaft, at least a portion of the first intercepting channel is staggered with the second intercepting channel; and / or along the radial direction of the rotating shaft, at least a portion of the second intercepting channel is staggered with the third intercepting channel.

4. The fan assembly according to claim 3, It is characterized in that At least one level of interception gap also includes: An expansion chamber is communicated with at least one of the second intercepting channel and the third intercepting channel.

5. The fan assembly according to claim 3, It is characterized in that The outer wall of the rotating shaft includes multiple axial surfaces, and the multiple axial surfaces are arranged along the axial direction of the rotating shaft. The distances between at least two of the axial surfaces and the rotation axis of the rotating shaft are different, so that at least one level of the intercepting gap can be formed between the side of the sealing member facing the rotating shaft and the multiple axial surfaces.

6. The fan assembly according to claim 5, It is characterized in that Along the airflow direction, the plurality of axial surfaces include a first axial surface and a second axial surface in sequence, and a distance between the first axial surface and the rotation axis of the rotating shaft is smaller than a distance between the second axial surface and the rotation axis of the rotating shaft; The outer wall of the rotating shaft further includes a first blocking surface, which is located between the first axial surface and the second axial surface and connected to the first axial surface and the second axial surface.

7. The fan assembly according to claim 6, It is characterized in that Along the axial direction of the rotating shaft, at least a portion of the first blocking surface is opposite to the first intercepting channel.

8. The fan assembly according to claim 4, It is characterized in that The sealing member comprises: sealed body; A plurality of sealing teeth are formed on the sealing body along the axial direction of the rotating shaft and are located between the rotating shaft and the sealing body; The spacing between at least two of the sealing teeth close to the side of the rotating shaft and the rotation axis of the rotating shaft is different, so that at least one level of interception gap can be formed between the side of multiple sealing teeth close to the rotating shaft and the outer wall of the rotating shaft.

9. The fan assembly according to claim 8, It is characterized in that Along the airflow direction, the plurality of sealing teeth sequentially include a first sealing tooth and a second sealing tooth, and the expansion chamber is located between the first sealing tooth and the second sealing tooth; The first sealing tooth comprises: A cut-off surface, wherein the cut-off surface and the outer wall of the rotating shaft form the first cut-off channel; The guide surface is connected to the cut-off surface and is located in the expansion cavity.

10. The fan assembly according to claim 1 or 2, It is characterized in that The fan assembly further comprises a housing, the housing being provided with a connecting mounting cavity and an air suction port, the driving member, the rotating shaft, at least one impeller and the returner being located in the mounting cavity; A blocking structure can also be formed between the side of the seal facing the rotating shaft and the outer wall of the rotating shaft. Along the axial direction of the rotating shaft, the blocking structure is located at one end of the interception gap of at least one level close to the air suction port and is connected to the interception gap of at least one level.

11. The fan assembly according to claim 10, It is characterized in that The blocking structure includes a blocking cavity; The sealing member is provided with a second blocking surface on one side facing the rotating shaft, and along the axial direction of the rotating shaft, the second blocking surface is opposite to the intercepting gap of at least one level; The outer wall of the rotating shaft comprises a chamfered surface, and the chamfered surface and the second blocking surface are combined to form the blocking cavity.

12. The fan assembly according to claim 1 or 2, It is characterized in that The number of the impellers is at least two, at least two of the impellers are arranged along the axial direction of the rotating shaft, and the return flow device is provided between two adjacent impellers.

13. A vacuum cleaner, It is characterized in that The invention comprises a fan assembly as claimed in any one of claims 1 to 12.

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