Sealing structure and motor and fan comprising same
The mechanical seal structure, composed of end caps, a rotating ring, a stationary ring, and seals, solves the problems of short service life and poor sealing performance of traditional motor sealing structures, achieving high-efficiency sealing without grease, extending the service life of the motor, and improving waterproof performance.
Patent Information
- Application Number
- CN202520065819.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Traditional motor sealing structures have short service life and poor sealing performance, and are prone to failure, especially in corrosive environments.
The mechanical seal structure, consisting of an end cap, a rotating ring, a stationary ring, and a seal, forms a grease-free sealing structure through clearance fit between the stationary ring and the rotating shaft, a tortuous path design, and elastic support, thereby enhancing the sealing effect.
It extends the service life of the sealing structure, improves sealing performance, prevents corrosive liquids from entering the motor, reduces noise, and enhances the motor's waterproof performance.
Smart Images
Figure CN223729555U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of household electrical appliances, in particular to a sealing structure and including its motor, fan. BACKGROUND
[0002] If the conventional motor needs to be sealed against water, dust and oil, the sealing protection of the motor bearing is generally considered, and the common method for bearing sealing is to add an oil seal cover to the outer side of the motor bearing, fill the oil seal cover with grease, and match the inner hole of the oil seal cover with the shaft. Because the grease is insoluble in water, the grease in the oil seal cover can isolate the external water or steam to a certain extent, and the water and steam cannot enter the motor interior through the bearing in a short time, thus the motor can be sealed to a certain extent.
[0003] However, during the operation of the motor, the motor shaft makes a circular motion, while the sealing cover is a stationary part, so the motor shaft and the inner hole of the sealing cover will continuously rub against each other, the inner hole of the sealing cover will be continuously worn and enlarged, and at the same time, the grease in the sealing cover will be thrown away by the centrifugal force of the motor shaft, resulting in no grease adsorbed near the shaft. Therefore, the external water and steam will penetrate along the position of the inner hole of the sealing cover, resulting in the sealing failure of the motor. More seriously, when the water or steam in the working environment of the motor is acidic or alkaline corrosive, the corrosive liquid will accelerate the destruction of the grease composition, thus accelerating the bearing and motor failure caused by the sealing failure of the motor. SUMMARY
[0004] The utility model wants to solve the technical problem that the service life of the motor sealing structure in the prior art is short, and the sealing performance is poor, and provides a sealing structure and a motor and a fan including the same.
[0005] The utility model solves the above technical problem by the following technical scheme:
[0006] A sealing structure of a motor, the sealing structure comprising:
[0007] At least one end cover connected to the axial end of the motor, and a rotating shaft of the motor penetrating through the at least one end cover;
[0008] A movable ring arranged in the inner cavity of the end cover, the movable ring being sleeved on the rotating shaft and fixedly connected with the rotating shaft;
[0009] A static ring comprising a matching part gap-connected with the rotating shaft and a static ring cavity arranged below the matching part in the direction of water vapor entering the motor, the movable ring being sleeved in the static ring cavity, and the movable ring being gap-connected with the static ring, and a radial outer wall of the static ring being fixedly connected with an inner wall of the end cover;
[0010] A seal is clamped between the dynamic ring and the rotating shaft and fixedly connected with the dynamic ring.
[0011] In the present scheme, the end cover, the dynamic ring, the static ring and the seal arranged in the above manner meet the rotating fit while forming a mechanical seal structure without grease; the radially outer wall of the static ring is fixedly connected to the inner wall of the end cover, and the gap between the fitting part of the static ring and the rotating shaft is reduced, so that most of the external water vapor is blocked by the axial outer end surface of the static ring and the end cover and is difficult to enter the motor interior from the gap between the static ring and the rotating shaft under the action of the centrifugal force; the seal is clamped between the dynamic ring and the rotating shaft and fixedly connected with the dynamic ring, forming an internal mechanical seal structure of the static ring, so that a small amount of water vapor entering along the gap between the static ring and the rotating shaft is sealed by the internal mechanical seal structure, improving the reliability of the seal; the fitting part is arranged on the static ring and the dynamic ring is sleeved in the static ring cavity, forming a tortuous fitting path on the fitting surface between the static ring and the dynamic ring, so that a small amount of water vapor entering along the gap between the static ring and the rotating shaft is also difficult to pass through the tortuous fitting path to enter the motor interior, further improving the reliability of the seal structure, prolonging the service life of the seal structure and improving the sealing performance.
[0012] Preferably, at least one set of protrusions and recesses that cooperate with each other are arranged on the fitting surface between the static ring and the dynamic ring, one of the protrusions and the recesses being arranged on the static ring, and the other of the protrusions and the recesses being arranged on the dynamic ring.
[0013] In the present scheme, at least one set of protrusions and recesses that cooperate with each other are arranged on the fitting surface between the static ring and the dynamic ring, enhancing the tortuosity of the fitting path, prolonging the fitting path, and making it more difficult for water vapor to pass through the tortuous fitting path, thereby improving the sealing effect.
[0014] Preferably, the outer end surface of the end cover perpendicular to the axial direction of the motor is inclined toward the motor side, and the outer end surface of the fitting part along the axial direction is inclined at the same angle as the outer end surface of the end cover.
[0015] In the present scheme, the outer end surfaces of the end cover and the fitting part form a slope structure with a high center and a low periphery, so that water vapor entering and subjected to the action of the centrifugal force is blocked and flows out along the slope structure, reducing the residence of water vapor on the outer surface of the end cover, thereby reducing the amount of water vapor entering the gap of the end cover and improving the sealing effect.
[0016] Preferably, at least one rolling bearing is arranged in the inner cavity, the rolling bearing is arranged below the dynamic ring in the direction of water vapor entering the motor, the rolling bearing is sleeved between the rotating shaft and the end cover, the inner ring of the rolling bearing is fixedly connected with the rotating shaft, and the outer ring of the rolling bearing is fixedly connected with the end cover.
[0017] The elastic member is sleeved on the rotating shaft, and two ends of the elastic member abut against end faces of the rotating ring and the rolling bearing respectively.
[0018] In the scheme, the elastic member is arranged between the rotating ring and the rolling bearing along the direction of water vapor entering the motor, so that the elastic member provides axial support force for the rotating ring and the rolling bearing respectively, the elastic member is in compression state during operation, the axial elastic force is provided, the gap between the rotating ring and the static ring is reduced, the play between the bearing ball and the inner and outer rings of the bearing is eliminated, the rotation accuracy is improved, the noise of the rotating shaft during operation is reduced, and the service life of the sealing structure is prolonged.
[0019] Preferably, the sealing member is an O-ring; and / or, the rotating shaft is provided with a groove, and the sealing member is clamped in the groove.
[0020] Preferably, the end cover comprises an upper end cover and a lower end cover; along the direction of water vapor entering the motor, the lower end cover is arranged at the front end of the motor, the upper end cover is arranged at the tail end of the motor, and the rotating shaft penetrates through the lower end cover.
[0021] The utility model discloses still provide following technical scheme:
[0022] A motor, the motor includes the sealing structure as described above.
[0023] A fan, the fan includes a fan shell, an impeller, and the fan further includes the motor as described above, the fan shell is sequentially provided with the impeller and the motor along the water vapor entering direction, and the rotating shaft of the motor is connected to the impeller.
[0024] Preferably, a flow channel is arranged between the fan shell and the end cover.
[0025] In the scheme, the gap between the fan shell and the end cover is left as a flow channel, so that when the water vapor is blocked by the end cover and affected by the centrifugal force, the water vapor can be thrown to the inner wall of the fan shell and discharged to the outside of the fan along the flow channel.
[0026] Preferably, along the direction of water vapor entering the motor, a sealing cover is arranged at the tail end of the motor, and the sealing cover and the end cover are fixedly connected.
[0027] In the scheme, the sealing cover is arranged at the tail end of the motor to cooperate with the end cover and other sealing structures, so as to prevent water or water vapor from entering from the tail end of the motor or the fan after being discharged, improve the sealing effect, and increase the waterproof performance of the fan.
[0028] The positive progress effect of the utility model lies in: through setting end cover, dynamic ring, static ring and sealing element, the mechanical sealing structure without grease is formed while meeting the rotary cooperation; wherein, the radial outer wall of the static ring is fixedly connected to the inner wall of the end cover, and the gap between the cooperation part of the static ring and the rotating shaft is reduced, and under the action of centrifugal force, most of the external water vapor is blocked by the axial outer end surface of the static ring and the end cover, and it is difficult to enter the motor interior from the gap between the static ring and the rotating shaft; the sealing element is clamped between the dynamic ring and the rotating shaft, and is fixedly connected with the dynamic ring, the internal mechanical sealing structure of the static ring is formed, so that the small amount of water vapor entering along the gap between the static ring and the rotating shaft is sealed by the internal mechanical sealing structure, and the reliability of the sealing is improved; the cooperation part is arranged on the static ring, and the dynamic ring is sleeved in the static ring cavity, the zigzag cooperation path is formed on the cooperation surface between the static ring and the dynamic ring, so that the small amount of water vapor entering along the gap between the static ring and the rotating shaft is also difficult to enter the motor interior through the zigzag cooperation path, on the basis of the sealing effect of the sealing element, the reliability of the sealing structure is further improved, the service life of the sealing structure is prolonged, and the sealing performance is improved. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 The utility model provides a structure schematic section view when the sealing structure provided by the utility model is installed in the fan.
[0030] Figure 2 The utility model provides a local enlarged section view of the sealing structure.
[0031] Figure 3 The utility model provides an explosion structure schematic view of each part of the sealing structure.
[0032] Figure 4 The utility model provides an explosion structure schematic view of the part of fan along the axial direction.
[0033] Figure 5 The utility model provides a structure schematic view of dynamic ring and static ring.
[0034] Figure 6 The utility model provides a structure schematic view of the rotating shaft of the sealing structure.
[0035] BRIEF DESCRIPTION OF DRAWINGS:
[0036] Fan shell 100
[0037] Impeller 200
[0038] Flow channel 300
[0039] Dynamic ring 10
[0040] Bulge 11
[0041] Static ring 20
[0042] fitting part 21
[0043] static ring cavity 22
[0044] recess 23
[0045] rotor assembly 3
[0046] stator core 30
[0047] stator assembly 303
[0048] magnetic steel 31
[0049] rotor yoke 32
[0050] shaft sleeve 33
[0051] rotating shaft 4
[0052] groove 40
[0053] seal 41
[0054] lower end cover 51
[0055] upper end cover 52
[0056] rolling bearing 6
[0057] elastic member 7
[0058] seal cover 8
[0059] PCB board 9
[0060] direction A of water vapor entering the motor DETAILED DESCRIPTION
[0061] The utility model will be further explained by the embodiment in combination with the drawings, but the utility model is not limited in the embodiment range.
[0062] As Figures 1-6 shown, the embodiment provides a sealing structure, which is used for a motor, and the motor is generally used in a fan of a household appliance. The sealing structure comprises: at least one end cover, the end cover is connected to an axial end of the motor, and a rotating shaft 4 of the motor penetrates the at least one end cover; a movable ring 10, the movable ring 10 is arranged in an inner cavity of the end cover, the movable ring 10 is sleeved on the rotating shaft 4 and fixedly connected with the rotating shaft 4; a static ring 20, the static ring 20 comprises a fitting part 21 which is gap-fitted with the rotating shaft 4 and a static ring cavity 22 which is arranged below the fitting part 21 along a direction A of water vapor entering the motor, the movable ring 10 is sleeved in the static ring cavity 22, the movable ring 10 is gap-fitted with the static ring 20, and a radial outer wall of the static ring 20 is fixedly connected to an inner wall of the end cover; a seal 41, the seal 41 is clamped between the movable ring 10 and the rotating shaft 4 and fixedly connected with the movable ring 10.
[0063] Specifically, as shown in Figure 1 and Figure 4 As an embodiment, the end cover in the embodiment has two, including the upper end cover 52 and the lower end cover 51, the upper end cover 52 and the lower end cover 51 are embedded and fixedly connected to form a motor shell surrounding the periphery and accommodating the motor inside. The space surrounded by the upper end cover 52 and the lower end cover 51 is used to accommodate the rotor assembly 3 of the fan, the rotor assembly 3 is arranged in the above-mentioned motor shell along the axial direction of the rotating shaft 4, and the rotor assembly 3 is sequentially sleeved on the rotating shaft 4 along the radial direction of the rotating shaft 4, including the shaft sleeve 33, the rotor yoke 32, the magnetic steel 31, the stator core 30, the stator core 30 is fixedly connected with the stator assembly 303, and the stator assembly 303 is circumferentially arranged outside the stator core 30. By setting the sealing structure at the connection between the lower end cover 51 and the rotating shaft 4, water vapor is prevented from entering from the outside along the axial direction of the rotating shaft and affecting the work and service life of the rotor assembly 3 and the stator assembly 303.
[0064] In the embodiment, water vapor enters from one end of the lower end cover 51, so the sealing structure is arranged at the lower end cover 51, along the direction A of the water vapor entering the motor, the lower end cover 51 is arranged at the front end of the motor, and the upper end cover 52 is arranged at the rear end of the motor. One end of the rotating shaft 4 penetrates the lower end cover 51 and extends from one side of the lower end cover 51 to the impeller 200 of the fan, and the other end of the rotating shaft 4 penetrates the upper end cover 52.
[0065] In the present scheme, the lower end cover 51, the dynamic ring 10, the static ring 20 and the sealing element 41 arranged in the above-mentioned manner form a mechanical sealing structure without grease while meeting the rotating fit; wherein the radial outer wall of the static ring 20 is fixedly connected to the inner wall of the lower end cover 51, and the gap between the fitting part 21 of the static ring 20 and the rotating shaft 4 is reduced, and under the action of centrifugal force, most of the external water vapor is blocked by the axial outer end surface of the static ring 20 and the end cover 51, and it is difficult for the water vapor to enter the motor interior from the gap between the static ring 20 and the rotating shaft 4; by clamping the sealing element 41 between the dynamic ring 10 and the rotating shaft 4 and fixedly connecting it with the dynamic ring 10, an internal mechanical sealing structure of the static ring 20 is formed, so that a small amount of water vapor entering through the gap between the static ring 20 and the rotating shaft 4 is sealed by the internal mechanical sealing structure, improving the reliability of the sealing; by setting the above-mentioned fitting part 21 on the static ring 20 and sleeving the dynamic ring 10 in the static ring cavity 22, a tortuous fitting path is formed on the fitting surface between the static ring 20 and the dynamic ring 10, so that a small amount of water vapor entering through the gap between the static ring 20 and the rotating shaft 4 is also difficult to pass through the tortuous fitting path to enter the motor interior, further improving the reliability of the sealing structure, prolonging the service life of the sealing structure and improving the sealing performance.
[0066] In other embodiments, different motors have different structural forms, and the number of end covers can be adjusted according to the specific structure of the motor, such as a motor having an end cover at only one end and the other end relying on the motor housing as a closed structure; in other embodiments, the object through which the rotating shaft penetrates is not limited to the lower end cover 51 in the present embodiment, and the end cover through which the rotating shaft 4 penetrates is specifically the upper end cover 52 or the lower end cover 51 according to the position and the need for cooperation, and the sealing structure is arranged on the upper end cover 52 or the lower end cover 51 according to the direction of the water vapor entering, or the upper end cover 52 and the lower end cover 51 are both provided with a sealing structure.
[0067] In which, the water vapor enters along one end of the motor and contacts the cooperation part 21 of the static ring 20 along the axial direction of the rotating shaft 4, and then flows out from the radial direction of the rotating shaft 4 along the outer surface of the lower end cover 51 under the influence of the centrifugal force of the rotating shaft 4, and a small part of the water vapor contacts the dynamic ring 10 and the sealing element 41 downward along the gap between the cooperation part 21 of the static ring 20 and the rotating shaft 4.
[0068] As one of the embodiments, the sealing element 41 in the present embodiment is an O-shaped sealing ring made of rubber, and in other embodiments, sealing elements made of other materials can be used as needed.
[0069] As shown in Figure 2 and Figure 5 , a set of protrusions 11 and recesses 23 are arranged on the cooperation surface between the static ring 20 and the dynamic ring 10, one of the protrusions 11 and the recesses 23 is arranged on the static ring 20, and the other of the protrusions 11 and the recesses 23 is arranged on the dynamic ring 10.
[0070] As one of the embodiments, by arranging the protrusions 11 and the recesses 23 on the cooperation surface between the static ring 20 and the dynamic ring 10, the static ring 20 and the dynamic ring 10 are abutted by the cooperation of the protrusions 11 and the recesses 23, and the static ring 20 is sleeved outside the dynamic ring 10, which enhances the tortuosity of the cooperation path, prolongs the cooperation path, and makes it more difficult for the water vapor to pass through the tortuous cooperation path, thereby improving the sealing effect.
[0071] In other embodiments, the cooperation surface of the static ring 20 and the dynamic ring 10 can be designed to have similar structural shapes as the protrusions 11 and the recesses 23 as needed, and multiple sets of protrusions 11 and recesses 23 can be arranged to cooperate, so as to enhance the tortuosity of the cooperation path, prolong the cooperation path, and block the water vapor.
[0072] As shown in Figure 1 , Figure 2 and Figure 5 , the outer end surface of the lower end cover 51 perpendicular to the axial direction of the motor is inclined to the side of the motor, and the outer end surface of the cooperation part 21 along the axial direction of the rotating shaft is inclined at the same angle as the outer end surface of the lower end cover 51.
[0073] The lower end cover 51 and the outer end surface of the matching part 21 are formed with a slope structure with a high center and a low periphery, so that the water vapor is blocked and flows out along the slope structure when it enters and is affected by the centrifugal force, reducing the residence of the water vapor on the outer surface of the end cover, thereby reducing the amount of water vapor entering the gap of the end cover and improving the sealing effect.
[0074] As shown in Figures 1-3 , at least one rolling bearing 6 is arranged in the inner cavity, the rolling bearing 6 is arranged below the dynamic ring 10 in the direction A of the water vapor entering the motor, the rolling bearing 6 is sleeved between the rotating shaft 4 and the end cover, the inner ring of the rolling bearing 6 is fixedly connected with the rotating shaft 4, and the outer ring of the rolling bearing 6 is fixedly connected with the end cover; the elastic member 7 is arranged between the dynamic ring 10 and the rolling bearing 6 in the direction A of the water vapor entering the motor, the elastic member 7 is sleeved on the rotating shaft 4, and the two ends of the elastic member 7 abut against the end surface of the dynamic ring 10 and the end surface of the rolling bearing 6 respectively.
[0075] As one of the embodiments, the elastic member 7 is arranged between the dynamic ring 10 and the rolling bearing 6 in the direction A of the water vapor entering the motor, so that the elastic member 7 provides axial support force for the dynamic ring 10 and the rolling bearing 6 respectively, wherein the elastic member 7 is in a compressed state when working, and by providing the axial elastic force, the gap of the dynamic ring 10 and the static ring 20 is reduced, the clearance of the bearing ball and the inner and outer rings of the bearing is eliminated, the rotation accuracy is improved, the noise of the rotating shaft 4 during working is reduced, and the working life of the sealing structure is prolonged.
[0076] Among them, the elastic member 7 is a spring, and in other embodiments, other elastic members 7 can be selected as needed, and the distribution and number of the rolling bearing 6 can be designed by those skilled in the art as needed.
[0077] As shown in Figures 1-3 and Figure 6 , the sealing member 41 is an O-ring. As one of the embodiments, the rotating shaft 4 is provided with a groove 40, and the sealing member 41 is clamped in the groove 40. By providing the groove 40 on the rotating shaft 4, the O-ring as the sealing member 41 is better clamped on the rotating shaft 4, and the sealing effect is increased.
[0078] As shown in Figure 1 , the fan includes a fan shell 100 and an impeller 200, and further includes a motor, the fan shell 100 is sequentially provided with the impeller 200 and the motor along the water vapor entering direction, and the rotating shaft 4 of the motor is connected to the impeller 200; the fan shell 100 and the end cover are provided with a flow channel 300.
[0079] By leaving a gap between the fan shell 100 and the end cover as the flow channel 300, when the water vapor is blocked by the end cover and is affected by the centrifugal force, it can be thrown to the inner wall of the fan shell 100 and discharged to the outside of the fan along the flow channel 300.
[0080] As shown in Figure 1As shown, the end of the motor is provided with a sealing cover 8 in the direction A of water vapor entering the motor, and the sealing cover 8 is fixedly connected with the end cover. As an embodiment, the sealing cover 8 is arranged at the end of the motor to cooperate with the end cover and other sealing structures to prevent water or water vapor from entering the motor or the fan end after being discharged, improve the sealing effect, and increase the waterproof performance of the fan.
[0081] In the embodiment, the PCB 9 is arranged at the end of the motor, and the sealing cover 8 is arranged at the end to prevent water vapor from flowing to the PCB 9. In other embodiments, whether the sealing cover 8 is arranged or not can be selected according to the penetrating position of the motor and the rotating shaft 4 and the distribution of components. If the rotating shaft does not penetrate the end of the motor and the end of the motor is not provided with components that need to be protected from water, the sealing cover 8 can not be arranged.
[0082] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship of the device or element in the normal use, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element must have a specific orientation at any time, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model in this respect.
[0083] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, but these changes and modifications all fall within the protection scope of the utility model.
Claims
1. A sealing structure for an electric motor, characterized in that, The sealing structure comprises: at least one end cover connected to an axial end of the motor, a rotating shaft of the motor penetrating through the at least one end cover; a dynamic ring arranged in an inner cavity of the end cover, the dynamic ring being sleeved on the rotating shaft and fixedly connected with the rotating shaft; a static ring comprising a matching part gap-matched with the rotating shaft and a static ring cavity arranged below the matching part in a direction of water vapor entering the motor, the dynamic ring being sleeved in the static ring cavity and gap-matched with the static ring, a radial outer wall of the static ring being fixedly connected to an inner wall of the end cover; a sealing member clamped between the dynamic ring and the rotating shaft and fixedly connected with the dynamic ring.
2. The seal structure for an electric machine according to claim 1, wherein At least one set of protrusions and recesses are arranged on a matching surface between the static ring and the dynamic ring, one of the protrusions and the recesses being arranged on the static ring and the other being arranged on the dynamic ring.
3. The seal structure for an electric machine according to claim 1, wherein An outer end surface of the end cover perpendicular to an axial direction of the motor is inclined to one side of the motor, and an outer end surface of the matching part along the axial direction is inclined at the same angle as an outer end surface of the end cover along the axial direction.
4. The seal structure for an electric machine according to claim 1, wherein At least one rolling bearing is arranged in the inner cavity of the end cover, the rolling bearing being arranged below the dynamic ring in the direction of water vapor entering the motor, the rolling bearing being sleeved between the rotating shaft and the end cover, an inner ring of the rolling bearing being fixedly connected with the rotating shaft, and an outer ring of the rolling bearing being fixedly connected with the end cover; An elastic member is arranged between the dynamic ring and the rolling bearing in the direction of water vapor entering the motor, the elastic member being sleeved on the rotating shaft, and two ends of the elastic member being respectively abutted against an end surface of the dynamic ring and an end surface of the rolling bearing.
5. The seal structure for an electric machine according to claim 1, wherein The sealing member is an O-ring; And / or, the rotating shaft is provided with a groove, and the sealing member is clamped in the groove.
6. The seal structure for an electric machine according to claim 1, wherein The end cover comprises an upper end cover and a lower end cover; In the direction of water vapor entering the motor, the lower end cover is arranged at a leading end of the motor, the upper end cover is arranged at a trailing end of the motor, and the rotating shaft penetrates through the lower end cover.
7. An electric machine characterized by The motor comprises the sealing structure according to any one of claims 1-6.
8. A fan comprising a fan housing, an impeller, characterized in that The fan further comprises the motor according to claim 7, the fan housing being sequentially provided with the impeller and the motor in the direction of water vapor entering, and a rotating shaft of the motor being connected to the impeller.
9. The fan of claim 8, wherein, A flow channel is arranged between the fan housing and the end cover.
10. The fan of claim 8 or 9, wherein In the direction of water vapor entering the motor, a sealing cover is arranged at the trailing end of the motor, and the sealing cover is fixedly connected with the end cover.