CN118257736A - Electric fan and cleaning equipment - Google Patents

Abstract

The embodiment of the application provides an electric fan and a dust collector. The electric fan includes: the driving motor is internally provided with an air suction channel; and the movable impeller is positioned at the downstream side of the air suction channel along the air flow direction and is connected with the driving motor, and is arranged to rotate under the driving of the driving motor so as to form the air flow flowing from the air suction channel to the movable impeller. The scheme can greatly reduce the possibility of water vapor entering the bearing chamber of the electric fan, thereby being beneficial to improving the service reliability and service life of the electric fan.

Description

Electric fan and cleaning equipment

Technical Field

The application relates to the technical field of cleaning equipment, in particular to an electric fan and cleaning equipment.

Background

At present, cleaning devices such as wet cleaners with a clean water tank and a sewage tank are becoming more popular with users. The structure of the electric fan of the cleaning device is shown in fig. 1, and a bearing is arranged on a branched flow passage passing through an air outlet of the impeller, so that water vapor and impurities can enter a bearing chamber. The bearing is easy to accumulate a small amount of water vapor after long-term use, so that the bearing can be quickly failed.

Disclosure of Invention

The application aims to provide an electric fan and cleaning equipment, which can greatly reduce the possibility of water vapor entering a bearing chamber of the electric fan.

To achieve the above object, an embodiment of the present application provides an electric fan for a cleaning apparatus, including: the driving motor is internally provided with an air suction channel; and the movable impeller is positioned at the downstream side of the air suction channel along the air flow direction and is connected with the driving motor, and is arranged to rotate under the driving of the driving motor so as to form the air flow flowing to the movable impeller from the air suction channel.

The electric fan provided by the embodiment of the application comprises the driving motor and the movable impeller, wherein the driving motor is used as a power source and can drive the movable impeller to rotate. The movable impeller rotates, so that a negative pressure can be generated in an air suction channel in the driving motor, and then outside air, water vapor, impurities and the like are sucked into the air suction channel together, and are output to a sewage tank and other structures of the cleaning equipment through the movable impeller, and the cleaning function is realized.

Because the impeller is located at the downstream side of the air suction channel in the driving motor, water vapor, impurities and the like enter the air suction channel first and enter the impeller driven impeller for severe compression after flowing out of the air suction channel. Therefore, the vapor, impurities and the like flowing through the driving motor are not compressed by the moving impeller, so that the flow speed is low, the dynamic pressure is small, and the vapor, the impurities and the like are not easy to enter a bearing chamber of the driving motor to cause bearing failure. Therefore, the electric fan provided by the embodiment of the application adopts an inverted electric fan structure, so that the possibility of bearing failure caused by water vapor accumulation in the bearing chamber can be greatly reduced.

On the basis of the technical scheme, the application can be improved as follows.

In an exemplary embodiment, the driving motor includes: a housing assembly; the rotating shaft penetrates through the shell assembly and is connected with the movable impeller, and a first bearing and a second bearing are sleeved on the rotating shaft; the motor main body comprises a rotor assembly sleeved on the rotating shaft and a stator assembly sleeved on the outer side of the rotor assembly, and the rotor assembly is positioned between the first bearing and the second bearing; and along the flow direction of the air flow, the motor main body is positioned at the upstream side of the air inlet of the movable impeller, and the first bearing is positioned at the upstream side of the second bearing.

In an exemplary embodiment, the housing assembly includes: a housing provided with a first bearing chamber for accommodating the first bearing; the bracket is connected with the shell and surrounds a mounting cavity for accommodating the motor main body with the shell; the movable vane comprises a casing, a bracket, a first air flow channel, a second air flow channel and an air inlet of the movable vane wheel, wherein the first air flow channel is arranged in the casing; the suction channel comprises the first airflow channel and the second airflow channel.

In an exemplary embodiment, the first air flow channel includes a first air passage provided in the housing, the first air passage being located outside the mounting cavity.

In an exemplary embodiment, the second air flow channel is provided to the bracket, which is further provided with a second bearing chamber for accommodating the second bearing.

In an exemplary embodiment, the electric fan further comprises a fixed impeller connected with the shell assembly, and the fixed impeller is provided with an air outlet channel communicated with an air outlet of the movable impeller; the fixed impeller is provided with a second bearing chamber for accommodating the second bearing; the casing is close to the one end open setting of movable vane wheel, the support with the motor main part is close to the space between the one end of movable vane wheel forms the second air current passageway.

In an exemplary embodiment, one end of the second bearing chamber, which is close to the rotor assembly, is opened, one end of the second bearing chamber, which is far away from the rotor assembly, is closed, an annular sealing boss is arranged on the stator wheel, the air outlet channel is positioned on the radial outer side of the sealing boss, and a sealing groove is formed in the sealing boss in a surrounding mode; the movable impeller comprises an end plate and blades arranged on the end plate, wherein the end plate is inserted in the sealing groove and in clearance fit with the sealing boss, and covers the open end of the second bearing chamber.

In an exemplary embodiment, the electric fan further includes a cowling and a support, the cowling being connected to the housing and covering an end of the motor body remote from the impeller; the support piece is positioned in the bracket and connected with the shell and the bracket, the support piece and the bracket encircle the second airflow channel, and the bracket is provided with a second bearing chamber for accommodating the second bearing.

In an exemplary embodiment, a first flow guiding rib is arranged in the first air passing channel; and/or a second flow guide rib is arranged in the second airflow channel.

In an exemplary embodiment, a sealing grease or shaft seal is provided between the end of the second bearing chamber remote from the rotor assembly and the shaft.

In an exemplary embodiment, the electric fan further includes a fairing connected to the casing and covering an end of the first bearing chamber away from the impeller and an end of the rotating shaft away from the impeller; the first air flow channel comprises a second air passage, the second air passage is positioned inside the mounting cavity, and the stator assembly is at least partially positioned in the second air passage.

In an exemplary embodiment, the second bearing is received in a second bearing chamber, and the electric fan further includes at least one of a first seal and a second seal; the first sealing piece is sleeved on the rotating shaft and seals one end, close to the rotor assembly, of the first bearing chamber; the second sealing piece is sleeved on the rotating shaft and seals one end, close to the rotor assembly, of the second bearing chamber.

In an exemplary embodiment, the first seal is a dynamic seal, the cross-sectional area of the first seal gradually increasing in a direction approaching the rotor assembly; and/or the second sealing element is a dynamic sealing element, one of the second sealing element and the end wall of the second bearing chamber, which is close to the rotor assembly, is provided with a sealing groove, and the other sealing element is provided with a sealing protrusion which is matched with the sealing protrusion in a concave-convex manner.

In an exemplary embodiment, the first sealing member is a static sealing member, the first sealing member is in sealing connection with the stator assembly, the first sealing member is in clearance fit with the rotating shaft, and sealing grease is arranged between the first sealing member and the rotating shaft; and/or, the second sealing element is a static sealing element, the second sealing element is in sealing connection with the stator assembly, the second sealing element is in clearance fit with the rotating shaft, and sealing grease is arranged between the second sealing element and the rotating shaft.

The embodiment of the application also provides cleaning equipment, which comprises the electric fan according to any one of the above embodiments.

Drawings

FIG. 1 is a schematic cross-sectional view of a conventional electric fan;

Fig. 2 is a schematic perspective view of an electric fan according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of the electric fan shown in FIG. 2;

FIG. 4 is a schematic perspective view of an embodiment of the present application with a fan with a fairing removed;

FIG. 5 is a schematic diagram of a front view of the electric fan shown in FIG. 2;

FIG. 6 is a schematic view of the bottom view of the electric fan shown in FIG. 2;

FIG. 7 is a schematic perspective view of the housing of FIG. 3;

FIG. 8 is a schematic perspective view of the bracket of FIG. 3;

Fig. 9 is a schematic perspective view of an electric fan according to an embodiment of the present application;

FIG. 10 is a schematic cross-sectional view of the electric blower of FIG. 9;

FIG. 11 is a schematic diagram of a front view of the electric fan shown in FIG. 9;

FIG. 12 is a schematic top view of the electric fan of FIG. 9;

FIG. 13 is a schematic view of the bottom view of the electric fan of FIG. 9;

Fig. 14 is a schematic perspective view of an electric fan according to an embodiment of the present application;

FIG. 15 is a schematic cross-sectional view of the electric blower of FIG. 14;

fig. 16 is a schematic diagram showing a front view of the electric fan shown in fig. 14;

FIG. 17 is a schematic top view of the electric fan of FIG. 14;

FIG. 18 is a schematic view of the bottom view of the electric fan of FIG. 14;

fig. 19 is a schematic perspective view of an electric fan according to an embodiment of the present application;

FIG. 20 is a schematic cross-sectional view of the electric blower of FIG. 19;

FIG. 21 is a schematic diagram showing a front view of the electric fan shown in FIG. 19;

FIG. 22 is a schematic top view of the electric fan of FIG. 19;

FIG. 23 is a schematic view of the bottom view of the electric fan of FIG. 19;

Fig. 24 is a schematic perspective view of an electric fan according to an embodiment of the present application;

FIG. 25 is a schematic cross-sectional view of the electric blower of FIG. 24;

fig. 26 is a schematic diagram showing a front view of the electric fan shown in fig. 24;

FIG. 27 is a schematic top view of the electric fan of FIG. 24;

fig. 28 is a schematic bottom view of the electric fan shown in fig. 24.

The labels in fig. 1 are illustrated as follows:

a 1' moving impeller, a 2' bearing and a 3' inlet;

the labels in fig. 2 to 28 are explained as follows:

A drive motor, an 11 outer shell component, a 111 machine shell, a 1111 first bearing chamber, a 1112 inner shell, a 1113 outer shell, a 1114 first guide rib, a 1115 first air passage, a 112 support, a 1121 second bearing chamber, a 1122 support shell, a 1123 support cylinder, a 1124 second guide rib, a 1125 second air passage, a 1126 seal boss, a 12 spindle, a 13 rotor component, a 14 stator component, a 141 second air passage, a 151 first bearing, a 152 second bearing, a 16 support, a 17 fairing, a 18 fairing, a 191 first seal, a 192 second seal, a 1921 seal groove;

2, a movable impeller, a 21 end plate and 22 blades;

3 fixed impellers, 31 air outlet channels, 32 sealing bosses, 33 first fixed impellers and 34 second fixed impellers;

The arrows in fig. 1,3, 10, 15, 20, and 25 indicate the direction of the air flow.

Detailed Description

The principles and features of the present application are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the application and are not to be construed as limiting the scope of the application.

Research finds that the reason why the bearing of the existing electric fan is easy to accumulate water vapor to cause failure is that:

As shown in fig. 1, the existing electric fan is a positive electric fan structure, namely: the structure of the front moving impeller and the rear motor has the main motor body located on the downstream side of the moving impeller. The bearing 2' chamber of the motor near the impeller ' has a possible inlet 3' for water vapor and impurities near the impeller ' and the inlet 3' is located downstream of the impeller ' outlet and opposite to the incoming flow direction, and the end of the bearing 2' chamber far from the impeller ' is provided with an opening for the shaft of the motor to pass through, the inlet 3' and the opening can form a channel for the air flow to pass through. Because the air flow speed of the air outlet of the movable impeller ' is extremely high, the dynamic pressure is extremely high, and water vapor and impurities are easy to enter the bearing 2' chamber through the inlet 3 '. Although the inlet 3' is typically sealed with grease or with a shaft seal. However, by adopting the grease sealing mode, the grease is gradually reduced and the effect is poorer and poorer along with the time; the shaft seal is worn, and the sealing effect is poorer and worse. Therefore, a small amount of moisture is easily accumulated in the chamber of the bearing 2 'after a long period of use, resulting in rapid failure of the bearing 2'.

The electric fan provided by the embodiment of the application adopts an inverted electric fan structure, namely: the motor main body is positioned on the upstream side of the movable impeller. Because the gas is not subjected to severe compression through the movable impeller, the section of the air suction channel is large, the gas flow speed is low, the whole pressure difference is small, and water vapor and impurities are not easy to enter the bearing chamber inside the motor, so that the bearing can be well protected.

The following detailed description refers to the accompanying drawings.

As shown in fig. 2 to 6, an embodiment of the present application provides an electric blower for a cleaning apparatus, including: a drive motor 1 and a rotor 2.

Wherein, an air suction channel (a first air passing channel 1115 and a second air flow channel 1125 are described below) is arranged in the driving motor 1. The impeller 2 is located on the downstream side of the suction passage in the air flow direction and is connected to the driving motor 1, and is configured to rotate under the driving of the driving motor 1 to form an air flow flowing from the suction passage to the impeller 2, as shown in fig. 3.

The electric fan provided by the embodiment of the application comprises a driving motor 1 and a movable impeller 2, wherein the driving motor 1 is used as a power source and can drive the movable impeller 2 to rotate. The impeller 2 rotates, so that the air suction channel in the driving motor 1 can generate negative pressure, and then outside air, water vapor, impurities and the like are sucked into the air suction channel, and are output to a sewage tank and other structures of the cleaning equipment through the impeller 2, thereby realizing the cleaning function.

As shown in fig. 3, since the impeller 2 is located at the downstream side of the suction passage in the driving motor 1, moisture, impurities, etc. first enter the suction passage, and after flowing out of the suction passage, enter the impeller 2 and are severely compressed by the impeller 2. Therefore, moisture, impurities, etc. flowing through the driving motor 1 have not been compressed by the moving impeller 2, so that the flow velocity is low, the dynamic pressure is small, and thus it is not easy to enter the bearing chamber of the driving motor 1 to cause bearing failure. Therefore, the electric fan provided by the embodiment of the application adopts an inverted electric fan structure, so that the possibility of bearing failure caused by water vapor accumulation in the bearing chamber can be greatly reduced.

In an exemplary embodiment, the electric fan further comprises a stator 3 connected to the drive motor 1, as shown in fig. 2,3 and 4. The fixed impeller 3 is provided with an air outlet channel 31 communicated with the air outlet of the movable impeller 2.

Compared with the structure of the upright electric fan, the inverted electric fan provided by the embodiment of the application has the advantages that the outlet part of the air duct (namely the air outlet of the fixed impeller 3) is not interfered by a motor, the flow passage is more convenient to design, and the multi-layer fixed impeller 3 can be designed to improve the working efficiency of the electric fan.

Thus, the number of stator vanes 3 is at least one, namely: there may be one (as shown in fig. 19 to 21), two (as shown in fig. 2, 3 and 5), three (as shown in fig. 4, 9, 10, 11, 14, 15 and 16) or more. When the number of fixed impellers 3 is plural, the plural fixed impellers 3 are stacked in the axial direction of the drive motor 1.

In an exemplary embodiment, the electric fan further includes a fan housing 18, as shown in fig. 3, 10, 15, and 25. The fan housing 18 is connected with the driving motor 1, the fixed impeller 3 is connected with the fan housing 18, and the movable impeller 2 is positioned in the fan housing 18. The fan housing 18 can better guide the air flow entering the movable impeller 2, thereby being beneficial to improving the working efficiency of the electric fan.

The fan housing 18 may be integrated with the stator 3 into a single structure, as shown in fig. 20.

In an exemplary embodiment, as shown in fig. 3 and 4, the driving motor 1 includes: a housing assembly 11, a shaft 12 and a motor body.

As shown in fig. 3, the rotating shaft 12 penetrates through the housing assembly 11 and is connected with the impeller 2. The rotating shaft 12 is sleeved with a first bearing 151 and a second bearing 152.

As shown in fig. 3, the motor body includes a rotor assembly 13 sleeved on the rotating shaft 12 and a stator assembly 14 sleeved on the outer side of the rotor assembly 13. The rotor assembly 13 is located between a first bearing 151 and a second bearing 152. The motor body is located on the upstream side of the air intake of the moving impeller 2 in the flow direction of the air flow, and the first bearing 151 is located on the upstream side of the second bearing 152.

In this embodiment, the driving motor 1 includes a housing assembly 11, a rotating shaft 12, and a motor body. The rotation shaft 12 is supported by a first bearing 151 and a second bearing 152. The first bearing 151 and the second bearing 152 are provided at positions of the rotation shaft 12 near both ends, respectively. The motor body comprises a rotor assembly 13 and a stator assembly 14. The rotor assembly 13 is sleeved on the rotating shaft 12 and rotates along with the rotating shaft 12. The stator assembly 14 is sleeved outside the rotor assembly 13 and remains relatively stationary with respect to the housing assembly 11. The stator assembly 14 may include a stator backbone and stator windings. The stator frame may be fixedly coupled to the housing assembly 11. The rotating shaft 12 is connected with the movable impeller 2 to drive the movable impeller 2 to synchronously rotate. The first bearing 151 is far from the impeller 2, and the second bearing 152 is near to the impeller 2, namely: the axial spacing between the first bearing 151 and the impeller 2 is greater than the axial spacing between the second bearing 152 and the impeller 2.

In one exemplary embodiment, as shown in fig. 3, the housing assembly 11 includes: a housing 111 and a bracket 112. The casing 111 is provided with a first bearing chamber 1111 for accommodating the first bearing 151. The bracket 112 is connected to the casing 111, and encloses a mounting chamber for accommodating the motor main body with the casing 111.

The casing 111 is provided with a first airflow channel, the bracket 112 is provided with a second airflow channel 1125, as shown in fig. 3, and the first airflow channel, the second airflow channel 1125 and the air inlet of the movable impeller 2 are sequentially communicated; the suction channel includes a first airflow channel and a second airflow channel 1125.

In this embodiment, the housing assembly 11 includes a housing 111 and a bracket 112, which facilitate assembly of the motor body. The casing 111 is far from the impeller 2, and the bracket 112 is near to the impeller 2. The casing 111 is provided with a first bearing chamber 1111, and the first bearing 151 is accommodated in the first bearing chamber 1111. The bracket 112 is connected to the casing 111, and may be fixedly connected by a fastener such as a bolt, a screw, or the like. The bracket 112 and the shell 111 enclose a mounting cavity, and the motor main body is accommodated in the mounting cavity, so that the motor main body is well protected.

In the use process, outside air carries water vapor, impurities and the like to flow through the shell 111 and the bracket 112 in sequence to reach the movable impeller 2.

The first air flow channel is located inside the casing 111, and the specific configuration is not limited. Such as: the structure of the casing 111 itself may be formed, or the casing 111 may be formed in cooperation with the structure inside the casing, or the structure inside the casing 111 may be formed, or the above-described various modes may be formed.

Similarly, the second air flow channel 1125 is located inside the bracket 112, and the specific configuration is not limited. Such as: the structure of the bracket 112 itself may be formed, or the bracket 112 may be formed in cooperation with the structure inside the bracket, or the structure inside the bracket 112 may be formed, or the plurality of modes may be formed.

Illustratively, the end of the casing 111 close to the impeller 2 is open, the end of the bracket 112 far from the impeller 2 is open, and the end of the casing 111 close to the impeller 2 is connected with the end of the bracket 112 far from the impeller 2. Such as by a bolt, screw, or other fastener. The casing 111 may extend substantially linearly along the axial direction of the rotating shaft 12, so that the casing 111 is convenient to be formed. The bracket 112 can be designed to be similar to a bowl-shaped structure, and an opening is arranged at the bottom of the bowl and is communicated with the air inlet of the movable impeller 2.

In an exemplary embodiment, the first air flow channel includes a first air passage 1115, the first air passage 1115 is provided in the housing 111, and the first air passage 1115 is located outside the installation cavity, as shown in fig. 3, 4 and 7.

The first air passage 1115 is provided in the housing 111 in this embodiment, that is, the first air passage 1115 is formed by the structure of the housing 111 itself. The first air passage 1115 and the second air passage 1125 communicate with each other to form at least a part of the air suction passage. In use, ambient air, moisture, impurities, etc. enter the air inlet of the movable impeller 2 through the first air passage 1115 and the second air passage 1125.

As illustrated in fig. 4 and 7, the casing 111 may be provided as a double-layered structure including an inner casing 1112 and an outer casing 1113 sleeved outside the inner casing 1112, with a first air passage 1115 formed between the outer casing 1113 and the inner casing 1112. The inner housing 1112 encloses a mounting cavity with the bracket 112. The first bearing chamber 1111 is connected to an end of the inner casing 1112 remote from the impeller 2 by a plurality of support ribs.

In an exemplary embodiment, the second air flow channel 1125 is provided in the bracket 112, and the bracket 112 is further provided with a second bearing chamber 1121 for accommodating the second bearing 152, as shown in fig. 3 and 8.

In this embodiment, the second air flow path 1125 is formed by the structure of the holder 112 itself. The bracket 112 is provided with a second bearing chamber 1121, and the second bearing 152 is accommodated in the second bearing chamber 1121. The gap between the bracket 112 and the shaft 12 is treated to be very small to prevent moisture, dust, etc. from entering the inside of the second bearing chamber 1121 to cause the second bearing 152 to fail.

The port of the second bearing chamber 1121 close to the impeller 2 faces the air inlet of the impeller 2 but faces away from the flow direction. Since the air flow is not compressed by the movable impeller 2, the dynamic pressure of the air flow is relatively small, and moisture is unlikely to enter the second bearing chamber 1121 through the port of the second bearing chamber 1121 near the movable impeller 2.

Illustratively, as shown in fig. 8, the bracket 112 may be provided as a double-layered structure including a support case 1122 and a support cylinder 1123 sleeved inside the support case 1122, the inner space of the support cylinder 1123 forming a second bearing chamber 1121. The space between the support shell 1122 and the support cylinder 1123 forms a second air flow channel 1125.

In one example, a grease seal or shaft seal is provided between the end of the second bearing chamber 1121 remote from the rotor assembly 13 and the shaft 12.

This seals the end of the second bearing chamber 1121 remote from the rotor assembly 13, effectively preventing moisture or dust from entering the second bearing chamber 1121 through the opening.

In one example, as shown in fig. 7, a first air passage 1115 is provided with a first air guiding rib 1114. As shown in fig. 8, a second flow guide rib 1124 is provided in the second air flow passage 1125.

The first air guide ribs 1114 are arranged in the first air passing channel 1115, and the first air guide ribs 1114 can rectify the air flow flowing through the first air passing channel 1115, so that the working efficiency of the electric fan is improved. In addition, the first guide ribs 1114 may also function as reinforcing ribs, which is beneficial to improving the strength and the use reliability of the casing 111. In addition, the first flow guiding ribs 1114 can also play a role of cooling fins, which is beneficial to increasing the cooling area of the driving motor 1, and further improving the cooling effect of the driving motor 1.

Similarly, the second air flow channel 1125 is provided with the second guide rib 1124, and the second guide rib 1124 can rectify the air flow flowing through the second air flow channel 1125, which is beneficial to improving the working efficiency of the electric fan. In addition, the second guide rib 1124 may also function as a reinforcing rib, which is beneficial to improving the strength and the use reliability of the bracket 112. In addition, the second flow guiding rib 1124 can also play a role of a heat radiating fin, which is beneficial to increasing the heat radiating area of the driving motor 1, and further improving the heat radiating effect of the driving motor 1.

In another exemplary embodiment, as shown in fig. 19 to 23, the electric fan further comprises a stator 3 connected to the housing assembly 11. The fixed impeller 3 is provided with an air outlet channel 31 communicated with the air outlet of the movable impeller 2. The stator impeller 3 is provided with a second bearing chamber 1121 for accommodating the second bearing 152, as shown in fig. 20. The end of the casing 111 near the impeller 2 is opened, and a space between the bracket 112 and the end of the motor body near the impeller 2 forms a second air flow passage 1125.

In this embodiment, the rotary shaft 12 of the drive motor 1 extends in a direction approaching the stator 3 and is inserted into the stator 3. Accordingly, the stator 3 is provided with a second bearing chamber 1121, and the second bearing 152 is accommodated in the second bearing chamber 1121. The fixed impeller 3 may be recessed in a direction away from the movable impeller 2 to form a second bearing chamber 1121.

Thus, the bracket 112 does not need to be designed into a double-layer structure, and the inner support cylinder 1123 can be omitted, so that the space between the bracket 112 and the end of the motor body close to the movable impeller 2 forms the second air flow passage 1125.

In one example, as shown in fig. 20, the second bearing chamber 1121 is disposed open near one end of the rotor assembly 13, and the second bearing chamber 1121 is disposed closed away from the end of the rotor assembly 13. The stator impeller 3 is provided with an annular sealing boss 32, the air outlet channel 31 is positioned at the radial outer side of the sealing boss 32, and the sealing boss 32 encloses a sealing groove. The impeller 2 includes an end plate 21 and blades 22 provided on the end plate 21. The end plate 21 is inserted into the seal groove and is in clearance fit with the seal boss 32, and covers the open end of the second bearing chamber 1121.

The second bearing chamber 1121 is provided open at one end near the rotor assembly 13, which facilitates both the forming of the stator vane 3 and the installation of the second bearing 152. The end of the second bearing chamber 1121 remote from the rotor assembly 13 is closed, so that the end of the second bearing chamber 1121 remote from the rotor assembly 13 is completely sealed, so that the second bearing chamber 1121 has only one opening, and an air flow channel into and out of the second bearing chamber 1121 cannot be formed, which is beneficial to preventing impurities and moisture from being carried into the second bearing 152 by the air flow passing through the second bearing chamber 1121.

Moreover, the movable impeller 2 is matched with the fixed impeller 3 in a concave-convex manner, the open end of the second bearing chamber 1121 is covered, and labyrinth sealing is realized, so that moisture can be prevented from entering the second bearing chamber 1121, and the second bearing 152 in the second bearing chamber 1121 is effectively protected.

In yet another exemplary embodiment (as shown in fig. 2-8), the electric fan further comprises a fairing 17 and a support 16. The cowling 17 is connected to the housing 111 and covers the end of the motor body remote from the impeller 2. The support 16 is located in the bracket 112 and is connected to the housing 111 and the bracket 112. The support 16 encloses a second air flow passage 1125 with the bracket 112, the bracket 112 being provided with a second bearing chamber 1121 for receiving a second bearing 152, as shown in fig. 3 and 8.

The fairing 17 can play a role in rectifying, so that the air flow can smoothly enter the air suction channel. The fairing 17 may be provided with vanes 22. In this solution, the fairing 17 is relatively large in size and can completely cover the end of the motor body remote from the impeller 2. While the opening of the mounting chamber near the end of the impeller 2 is blocked by the support 16. In this way, the air flow can only enter the movable impeller 2 through the first air passage 1115 and the second air passage 1125 outside the installation cavity, the parts of the motor body which are easily damaged by water vapor and dust are all positioned at the upstream of the air flow, and the water vapor and dust mixed with the air flow can hardly enter the bearing inside the motor, so that the water absorption of the electric fan can be ensured to the greatest extent.

In one example, a grease seal or shaft seal is provided between the end of the second bearing chamber 1121 remote from the rotor assembly 13 and the shaft 12.

This seals the end of the second bearing chamber 1121 remote from the rotor assembly 13, effectively preventing moisture or dust from entering the second bearing chamber 1121 through the opening.

In another exemplary embodiment (as shown in fig. 24 to 28), the electric fan further includes a fairing 17, and the fairing 17 is connected to the casing 111 and covers an end of the first bearing chamber 1111 remote from the impeller 2 and an end of the rotating shaft 12 remote from the impeller 2.

The first air flow channel comprises a second air passage 141, the second air passage 141 being located inside the mounting cavity, and the stator assembly 14 being located at least partially within the second air passage 141.

In this embodiment, the size of the fairing 17 is relatively small, and only covers the end of the first bearing chamber 1111 away from the impeller 2 and the end of the shaft 12 away from the impeller 2. In this way, the end of the first bearing chamber 1111 far from the impeller 2 can be completely sealed, so that the first bearing chamber 1111 is equivalent to only one opening, and an air flow channel with one inlet and one outlet cannot be formed, which is beneficial to avoiding that the air flow passes through the first bearing chamber 1111 to bring impurities and water vapor into the first bearing 151.

And, the first air flow channel includes the second air flow channel 141, and the second air flow channel 141 is located in the installation cavity, and the stator assembly 14 is located in the second air flow channel 141 at least partially (such as the stator winding), so that the external air flow can flow through the second air flow channel 141, and the stator winding of the stator assembly 14 can obtain forced cooling of the air flow, so that the capacity of the driving motor 1 can be improved, the working efficiency of the electric fan can be improved, and the working reliability of the electric fan can be improved.

In some embodiments, as shown in fig. 9-23, the first gas flow channel includes a first gas passage 1115 and a second gas passage 141. In other words, the suction passage has two flow paths, and the air flow can enter the impeller 2 in two paths.

In other embodiments, as shown in fig. 24-28, the first gas flow channel includes only the second overgas channel 141 and does not include the first overgas channel 1115. In other words, the suction channel has only one flow path, and only one flow path of the air flow enters the impeller 2. In this scheme, can increase the diameter of stator core of stator module 14, the size design of stator groove is bigger relatively for can form great passageway that induced drafts in the stator module 14, all intakes all pass through stator winding like this, can realize very good cooling effect, are favorable to reducing motor loss, promote motor efficiency and reliability. And from the air suction channel to the air inlet of the movable vane wheel 2, the air flow is less in bending, and the air flow is smooth, so that the motor efficiency is further improved.

Of course, as shown in fig. 2 to 8, the first air flow channel may include only the first air passing channel 1115, but not the second air passing channel 141, and the air suction channel has only one channel, and only one air flow enters the impeller 2.

In an exemplary embodiment, the second bearing 152 is received within the second bearing chamber 1121. As shown in fig. 10, 15, 20 and 25, the electric fan further includes at least one of a first seal 191 and a second seal 192. The first sealing member 191 is sleeved on the rotating shaft 12, and seals one end of the first bearing chamber 1111, which is close to the rotor assembly 13. The second sealing member 192 is sleeved on the rotating shaft 12, and seals one end of the second bearing chamber 1121 near the rotor assembly 13.

The end of the first bearing chamber 1111 near the rotor assembly 13 is provided with an opening for inserting the first bearing 151 and the rotating shaft 12, which may cause moisture in the second air passage 141 to enter the first bearing chamber 1111. Accordingly, providing the first seal 191 to seal the end of the first bearing chamber 1111 proximate to the rotor assembly 13 may reduce the likelihood of moisture entering the first bearing chamber 1111.

The end of the second bearing chamber 1121 adjacent to the rotor assembly 13 is provided with an opening into which the second bearing 152 and the rotating shaft 12 are inserted, possibly causing moisture in the second air passage 141 to enter the second bearing chamber 1121. Accordingly, the provision of the second seal 192 to seal the end of the second bearing chamber 1121 adjacent the rotor assembly 13 may reduce the likelihood of moisture entering the second bearing chamber 1121.

In the case of the second bearing chamber 1121 provided on the stator 3, the end plate 21 of the movable impeller 2 and the sealing boss 32 of the stator 3 are matched to form a labyrinth seal, so that moisture is effectively prevented from entering the second bearing chamber 1121, and the second sealing member 192 can be omitted.

In an exemplary embodiment, as shown in fig. 10, the first seal 191 is a dynamic seal, and the cross-sectional area of the first seal 191 gradually increases in a direction approaching the rotor assembly 13.

The first seal 191 is a dynamic seal, i.e., a seal that rotates with the shaft 12 and the rotor assembly 13 during use. The cross-sectional area of the first sealing member 191 gradually increases in a direction approaching the rotor assembly 13, and then the outer sidewall of the first sealing member 191 is in a circular truncated cone shape or substantially in a circular truncated cone shape, having a certain taper (inclination), so that the moisture condensed on the first sealing member 191 is thrown outward during the rotation process, thereby further reducing the possibility that the moisture enters the first bearing chamber 1111.

Also, the end of the first bearing chamber 1111 near the rotor assembly 13 faces away from the incoming flow direction, and the end of the first bearing chamber 1111 far from the rotor assembly 13 is equivalent to being completely sealed by the fairing 17, so that the possibility of moisture entering the first bearing chamber 1111 in the reverse direction is very low. Accordingly, the first seal 191 has a relatively simple structure, and thus a reliable sealing effect can be achieved.

For example, the first seal 191 may be embedded within the first bearing chamber 1111 and located at a port of the first bearing chamber 1111 proximate to the rotor assembly 13.

In one exemplary embodiment, as shown in FIG. 10, the second seal 192 is a dynamic seal. One of the second seal 192 and the second bearing chamber 1121 adjacent to the end wall of the rotor assembly 13 is provided with a seal groove 1921, and the other is provided with a seal protrusion 1126. The sealing groove 1921 is in a male-female fit with the sealing protrusion 1126.

The second seal 192 is a dynamic seal, i.e., a seal that rotates with the shaft 12 and rotor assembly 13 during use. Since the end of the second bearing chamber 1121 near the rotor assembly 13 is open larger and faces in the incoming flow direction, moisture is more likely to be caused to enter. Also, for the case where the second bearing chamber 1121 is provided on the bracket 112, an opening through which the rotation shaft 12 passes is provided at an end of the second bearing chamber 1121 remote from the rotor assembly 13, and thus the second bearing chamber 1121 may form a passage through which the air flow passes in and out. Therefore, the second seal member 192 and the corresponding end wall of the second bearing chamber 1121 form a labyrinth seal structure in a concave-convex fit manner, which is advantageous for improving the sealing effect on the second bearing chamber 1121 and further for improving the sealing reliability.

In one exemplary embodiment, as shown in fig. 15, 20 and 25, the first seal 191 is a static seal. The first seal 191 is sealingly coupled to the stator assembly 14. The first sealing member 191 is in clearance fit with the rotating shaft 12, and sealing grease is arranged between the first sealing member 191 and the rotating shaft 12.

The first seal 191 is a static seal, namely: a seal that does not rotate with the shaft 12 and rotor assembly 13 during use. The first seal 191 is in sealing connection with the stator frame of the stator assembly 14 (sealing connection can be realized by sealant), and connection reliability and sealing reliability with the stator assembly 14 can be ensured. The first sealing member 191 is in clearance fit with the rotating shaft 12, so that the resistance to the rotating shaft 12 can be reduced, and the efficiency of the motor can be improved. The sealing grease is arranged between the first sealing member 191 and the rotating shaft 12, so that the sealing grease can play a role in blocking water vapor, and the protection effect on the first bearing 151 is improved.

For example, the first seal 191 may include a seal body that covers the first bearing chamber 1111 near the open end of the rotor assembly 13, and a seal ring that is connected to the outer side wall of the seal body and abuts against the outer side wall of the first bearing chamber 1111.

In one exemplary embodiment, as shown in fig. 15 and 25, the second seal 192 is a static seal. The second seal 192 is sealingly coupled to the stator assembly 14. The second sealing member 192 is in clearance fit with the rotating shaft 12, and sealing grease is provided between the second sealing member 192 and the rotating shaft 12.

The second seal 192 is a static seal, i.e., a seal that does not rotate with the shaft 12 and rotor assembly 13 during use. The second seal 192 is in sealing connection with the stator frame of the stator assembly 14 (sealing connection may be achieved by sealant), and connection reliability and sealing reliability with the stator assembly 14 may be ensured. The second sealing member 192 is in clearance fit with the rotating shaft 12, so that resistance to the rotating shaft 12 can be reduced, and the efficiency of the motor can be improved. The sealing grease is arranged between the second sealing member 192 and the rotating shaft 12, so that the sealing grease can play a role in blocking water vapor, and is beneficial to improving the protection effect on the second bearing 152.

Illustratively, the second seal 192 may include a seal body that covers the second bearing chamber 1121 proximate the open end of the rotor assembly 13 and a seal ring that is coupled to an outer sidewall of the seal body and abuts an outer sidewall of the second bearing chamber 1121.

The embodiment of the application also provides cleaning equipment, which comprises the electric fan in any one of the embodiments, so that the cleaning equipment has all the beneficial effects and is not repeated herein.

In an exemplary embodiment, the cleaning device is a wet cleaner.

Several specific embodiments are described below with reference to the accompanying drawings.

Detailed description of the preferred embodiments (as shown in FIGS. 2-8)

This particular embodiment provides an electric fan comprising: the drive motor 1, the movable impeller 2, the two stationary impellers 3 (first stationary impeller 33 and second stationary impeller 34), the fairing 17, the support 16 and the fairing 18. The drive motor 1 includes: the rotor assembly 13, the stator assembly 14, the housing 111, the bracket 112, the first bearing 151, and the second bearing 152.

The fairing 17, the casing 111, the bracket 112, the fan housing 18, the first stator vane 33, and the second stator vane 34 are sequentially connected in the axial direction of the motor. The movable impeller 2 is located between the fan housing 18 and the first stator impeller 33. The casing 111 is provided with a first air passage 1115 and a first bearing chamber 1111. The bracket 112 is provided with a second bearing chamber 1121. The support 16 is provided in the bracket 112 and is connected to the cabinet 111 and the bracket 112. The bracket 112 and the support 16 enclose a second airflow channel 1125. The fairing 17 is connected to the end of the casing 111 remote from the impeller 2 and covers the end of the motor body remote from the impeller 2. When the electric fan is arranged in the dust collector, the fairing 17 can be replaced by structural members of the dust collector, so that the electric fan can cancel the fairing 17 and directly utilize the structural members of the dust collector to play a role in rectification.

The first air flow channel includes only the first air passing channel 1115, and the suction channel includes only the first air passing channel 1115 and the second air flow channel 1125. The motor body is positioned on the upstream side of the air inlet of the movable impeller 2. The stator assembly 14, the rotor assembly 13 and the two bearings are completely sealed within the mounting cavity. The heat conducting material can be properly filled in the mounting cavity, so that better heat dissipation is realized.

The motor extends only one shaft 12 for connection with the impeller 2 and the gap between the bracket 112 and the shaft 12 is treated to be very small to prevent moisture and dust from entering the interior of the motor, causing the second bearing 152 to rust and thus causing the fan to fail rapidly. This gap is the only possible inlet for water vapor and impurities and is filled with a sealing grease or shaft seal.

Because the parts of the electric fan which are easy to be damaged by water vapor and dust are all positioned at the upstream of the air flow, the water vapor and dust mixed with the air flow can hardly enter the bearing in the motor, and the water absorbability of the electric fan can be ensured to the greatest extent.

The casing 111 is divided into an inner part and an outer part by a first air passage, and the two parts are connected by a plurality of first air guide ribs 1114. The bracket 112 is divided into an inner part and an outer part by a second air flow channel, and the two parts are connected through a plurality of second guide ribs 1124. The first and second ribs 1114, 1124 may also function as cooling fins while rectifying. The first and second ribs 1114, 1124 may be straight blades or angled blades with curvature.

Second embodiment (as shown in FIGS. 9 to 13)

The difference from the first embodiment is that: the fairing 17 is reduced and the support 16 is eliminated and a second air passage 141 is provided in the mounting cavity, the stator assembly 14 being at least partially located in the second air passage 141. The first air flow channel includes a first air passing channel 1115 and a second air passing channel 141, and the suction channel includes the first air passing channel 1115, the second air passing channel 1125 and the second air passing channel 141.

Thus, the air flow can enter the movable impeller 2 in two ways, and the air flow entering the movable impeller 2 through the second air passage 141 can forcedly cool the stator assembly 14 by cold air flow, so that the motor capacity can be improved, the motor efficiency can be improved, and the motor reliability can be improved.

Since the fairing 17 is reduced and the support 16 is eliminated, the first bearing 151 and the second bearing 152 cannot be completely sealed, but still have advantages over the existing positive electric fans: the side of the first bearing 151 far from the rotor assembly 13 is sealed off (sealed by the fairing 17) so that the first bearing chamber 1111 cannot form a channel for entering and exiting, and it is difficult for air flow to pass through the first bearing chamber 1111 to form an air flow channel, and it is also difficult for impurities and moisture to be brought into the first bearing 151; both the first bearing 151 and the second bearing 152 are positioned at the flow passage of the maximum section before the air flow is compressed, and because the flow passage section is large, the air flow speed is low, and a large pressure difference is not easily formed, so that moisture and dust are not easily introduced into the bearing.

And, a first sealing member 191 and a second sealing member 192 rotating with the rotating shaft 12 are added to the rotating shaft 12. The first seal 191 serves to seal an end of the first bearing chamber 1111 adjacent to the rotor assembly 13. The second seal 192 is used to seal an end of the second bearing chamber 1121 adjacent to the rotor assembly 13. The first sealing member 191 is designed to have a ring structure with a certain taper, so that water vapor can be thrown out conveniently. The second seal 192 is designed in the form of a labyrinth seal, which is advantageous for enhancing the sealing effect.

Third embodiment (as shown in FIGS. 14 to 18)

The difference from the second embodiment is that: the first and second seals 191 and 192 are static seals that are secured to the stator frame and the extension of the corresponding bearing housing. Gaps between the first sealing member 191 and the second sealing member 192 and fixed parts (such as a stator frame, a first bearing chamber 1111 and a second bearing chamber 1121) are filled with sealant, and gaps between the first sealing member and the rotating parts (such as a rotating shaft 12) are sealed with sealant, so that corrosion damage to the bearings is avoided.

Detailed description IV (as shown in FIGS. 19 to 23)

The difference from the second embodiment or the third embodiment is that: the second bearing chamber 1121 is disposed on the first stator vane 33, so that the first bearing 151 and the second bearing 152 are completely sealed on one side (the side of the first bearing 151 away from the rotor assembly 13 is completely sealed by the fairing 17, and the side of the second bearing 152 away from the rotor assembly 13 is completely sealed by the first stator vane 33), so that neither the first bearing chamber 1111 nor the second bearing chamber 1121 can form an air flow channel into or out of the bearing chamber (the first bearing chamber 1111 or the second bearing chamber 1121), and moisture and dust can be prevented from being carried in by the air flow to facilitate avoiding damage to the bearing (the first bearing 151 or the second bearing 152) to cause failure of the electric fan.

The end of the first bearing chamber 1111 near the rotor assembly 13 is provided with a first sealing member 191, and the first sealing member 191 may be a dynamic sealing member or a static sealing member in the above embodiment. The second bearing chamber 1121 is close to one end of the rotor assembly 13, and labyrinth seal is realized by concave-convex cooperation of the sealing boss 32 on the fixed impeller 3 and the outer edge of the end plate 21 of the movable impeller 2.

Fifth embodiment (as shown in FIGS. 24 to 28)

The difference from the second embodiment or the third embodiment is that: by properly enlarging the diameter of the stator core, the area of the stator slot is increased as much as possible, the flow cross section of the second air passage 141 is increased, and the first air passage 1115 is eliminated. Thus, all air is fed through the stator winding, so that a very good cooling effect can be realized, the loss of the motor is reduced, and the efficiency and the reliability of the motor are improved.

And, from the second air passage 141 to the air inlet of the movable vane wheel 2, the air flow is less in bending, and the air flow is smooth, so that the motor efficiency can be further improved. The first bearing 151 seal and the second bearing 152 seal may take the form of the first seal 191 and the second seal 192 of the second or third embodiment described above.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (15)

1. An electric fan for a cleaning apparatus, comprising:

The driving motor is internally provided with an air suction channel; and

And the impeller is positioned at the downstream side of the air suction channel along the air flow direction and is connected with the driving motor, and is arranged to rotate under the driving of the driving motor so as to form the air flow flowing to the impeller from the air suction channel.

2. The electric fan as claimed in claim 1, wherein the driving motor includes:

A housing assembly;

The rotating shaft penetrates through the shell assembly and is connected with the movable impeller, and a first bearing and a second bearing are sleeved on the rotating shaft; and

The motor main body comprises a rotor assembly sleeved on the rotating shaft and a stator assembly sleeved on the outer side of the rotor assembly, and the rotor assembly is positioned between the first bearing and the second bearing; and along the flow direction of the air flow, the motor main body is positioned at the upstream side of the air inlet of the movable impeller, and the first bearing is positioned at the upstream side of the second bearing.

3. The electric fan of claim 2, wherein the housing assembly comprises:

A housing provided with a first bearing chamber for accommodating the first bearing; and

The bracket is connected with the shell and surrounds a mounting cavity for accommodating the motor main body with the shell;

The movable vane comprises a casing, a bracket, a first air flow channel, a second air flow channel and an air inlet of the movable vane wheel, wherein the first air flow channel is arranged in the casing; the suction channel comprises the first airflow channel and the second airflow channel.

4. The electric fan as claimed in claim 3, wherein,

The first air passage comprises a first air passage, the first air passage is arranged on the casing, and the first air passage is arranged on the outer side of the mounting cavity.

5. The electric fan as claimed in claim 4, wherein,

The second air flow channel is arranged on the bracket, and the bracket is also provided with a second bearing chamber for accommodating the second bearing.

6. The electric fan as claimed in claim 4, wherein,

The electric fan further comprises a fixed impeller connected with the shell assembly, and the fixed impeller is provided with an air outlet channel communicated with an air outlet of the movable impeller; the fixed impeller is provided with a second bearing chamber for accommodating the second bearing;

The casing is close to the one end open setting of movable vane wheel, the support with the motor main part is close to the space between the one end of movable vane wheel forms the second air current passageway.

7. The electric fan as claimed in claim 6, wherein,

The second bearing chamber is arranged at one end close to the rotor assembly in an open mode, one end, far away from the rotor assembly, of the second bearing chamber is arranged in a closed mode, the fixed impeller is provided with an annular sealing boss, the air outlet channel is located at the radial outer side of the sealing boss, and a sealing groove is formed in the sealing boss in a surrounding mode;

the movable impeller comprises an end plate and blades arranged on the end plate, wherein the end plate is inserted in the sealing groove and in clearance fit with the sealing boss, and covers the open end of the second bearing chamber.

8. The electric fan as claimed in claim 4, wherein,

The electric fan further comprises a fairing and a supporting piece, wherein the fairing is connected with the shell and covers one end of the motor main body far away from the movable impeller; the support piece is positioned in the bracket and connected with the shell and the bracket, the support piece and the bracket encircle the second airflow channel, and the bracket is provided with a second bearing chamber for accommodating the second bearing.

9. The electric fan according to any one of claims 4 to 8, characterized in that,

A first guide rib is arranged in the first air passage; and/or

And a second guide rib is arranged in the second airflow channel.

10. The electric fan as claimed in claim 5 or 8, wherein,

And sealing grease or shaft seal is arranged between one end of the second bearing chamber, which is far away from the rotor assembly, and the rotating shaft.

11. The electric fan according to any one of claims 3 to 7, characterized in that,

The electric fan further comprises a fairing, wherein the fairing is connected with the shell and covers one end of the first bearing chamber far away from the movable impeller and one end of the rotating shaft far away from the movable impeller;

the first air flow channel comprises a second air passage, the second air passage is positioned inside the mounting cavity, and the stator assembly is at least partially positioned in the second air passage.

12. The electric blower of claim 11, wherein the second bearing is received within a second bearing chamber, the electric blower further comprising at least one of a first seal and a second seal;

The first sealing piece is sleeved on the rotating shaft and seals one end, close to the rotor assembly, of the first bearing chamber;

The second sealing piece is sleeved on the rotating shaft and seals one end, close to the rotor assembly, of the second bearing chamber.

13. The electric fan as claimed in claim 12, wherein,

The first sealing element is a dynamic sealing element, and the cross section area of the first sealing element is gradually increased along the direction approaching to the rotor assembly; and/or

The second sealing element is a dynamic sealing element, one of the second sealing element and the end wall of the second bearing chamber, which is close to the rotor assembly, is provided with a sealing groove, and the other sealing element is provided with a sealing protrusion which is matched with the sealing protrusion in a concave-convex mode.

14. The electric fan as claimed in claim 12, wherein,

The first sealing piece is a static sealing piece and is in sealing connection with the stator assembly, the first sealing piece is in clearance fit with the rotating shaft, and sealing grease is arranged between the first sealing piece and the rotating shaft; and/or

The second sealing piece is a static sealing piece, the second sealing piece is in sealing connection with the stator assembly, the second sealing piece is in clearance fit with the rotating shaft, and sealing grease is arranged between the second sealing piece and the rotating shaft.

15. A cleaning appliance comprising an electric fan as claimed in any one of claims 1 to 14.