CN217354843U

CN217354843U - Fan and cleaning equipment

Info

Publication number: CN217354843U
Application number: CN202221360581.6U
Authority: CN
Inventors: 何俊龙; 乔正忠; 丁荣
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-09-02
Anticipated expiration: 2032-06-01

Abstract

The utility model discloses a fan and cleaning equipment, the fan comprises a shell component, a fan cover, an impeller and a diffuser, an installation part is arranged in the shell component, and the installation part is connected with a stator component and a rotor component; the fan cover is connected with the shell component; the impeller is positioned in the fan cover and is connected with the rotating shaft of the rotor assembly; the diffuser is connected to the mounting portion to the diffuser is located between impeller and the casing subassembly, and the diffuser is provided with along axially extended installation section of thick bamboo, and installation section of thick bamboo suit is in the mounting portion, and at least one in installation section of thick bamboo and the installation portion of installation and diffuser is formed with face seal structure. The rotor assembly drives the impeller to rotate at a high speed, the impeller and the fan cover are matched to generate high-speed airflow, and the high-speed airflow is diffused through the first-stage diffuser to generate large suction force and meet the use requirement of cleaning equipment. At least one surface sealing structure is formed between the mounting part and the diffuser, and the surface sealing structure blocks air flow from leaking from a gap between the mounting part and the diffuser, so that the efficiency of the fan is improved.

Description

Fan and cleaning equipment

Technical Field

The utility model relates to the technical field of household appliances, in particular to fan and cleaning equipment.

Background

In the related art, some cleaning devices employ a fan as a power source, such as a hand-held cleaner. When the motor of the fan drives the impeller to rotate, a large vacuum degree is formed at the inlet of the fan cover, airflow is sucked from the opening of the fan cover, and flows out through the downstream diffuser after obtaining large kinetic energy through the flow passage of the impeller. A fan adopted by the handheld dust collector has the characteristics of small volume, high rotating speed and the like, and as the suction force demand is higher and higher, the power of the fan is higher, but the problems of low efficiency caused by power increase and small volume are to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a fan can effectively raise the efficiency.

The utility model discloses propose simultaneously the cleaning device who adopts above-mentioned fan.

The fan according to the embodiment of the first aspect of the present invention comprises a housing assembly, a fan cover, an impeller and a diffuser, wherein an installation part is arranged inside the housing assembly, and the installation part is connected with a stator assembly and a rotor assembly; the fan cover is connected to the shell component; the impeller is positioned in the fan cover and is connected with the rotating shaft of the rotor assembly; the diffuser connect in the installation department, and the diffuser is located the impeller with between the casing subassembly, the diffuser is provided with along axially extended's an installation section of thick bamboo, an installation section of thick bamboo suit in the installation department, the installation department with the diffuser and an installation section of thick bamboo with at least one in the installation department is formed with face seal structure.

According to the utility model discloses fan of the first aspect embodiment has following beneficial effect at least: the rotor assembly drives the impeller to rotate at a high speed, the impeller and the fan cover are matched to generate high-speed airflow, and the high-speed airflow is diffused through the first-stage diffuser to generate large suction force and meet the use requirement of cleaning equipment. Form at least one face seal structure between installation department and the diffuser, face seal structure can block the air current and leak away from the gap between installation department and the diffuser, prevents that the air current from running off to improve the efficiency of fan.

According to some embodiments of the first aspect of the present invention, the mounting portion with the diffuser is formed with at least one face seal structure, and the mounting section with the mounting portion is formed with at least one face seal structure follows housing assembly's radial, a plurality of face seal structure connects gradually.

According to the utility model discloses some embodiments of first aspect, the installation department is provided with first continuous curved surface, the diffuser is provided with the continuous curved surface of second, first continuous curved surface butt the contact of the continuous curved surface of second is in order to form face seal structure.

According to some embodiments of the first aspect of the present invention, the mounting portion is provided with an orientation a first plane of the diffuser, the diffuser is provided with a second plane, the first plane and the second plane contact to form the face seal structure.

According to some embodiments of the first aspect of the present invention, the first plane is provided with a first mounting hole, the second plane is provided with a second mounting hole, and a fastener is provided in the first mounting hole and the second mounting hole.

According to some embodiments of the first aspect of the present invention, the mounting portion is provided with a mounting groove for accommodating the mounting tube, along the axial direction of the housing assembly, the second plane with the distance between the end faces of the mounting tube is H1, the depth of the mounting groove is H2, satisfying H1 < H2.

According to some embodiments of the first aspect of the present invention, in a radial direction of the housing assembly, the mounting portion is provided with a gap between the mounting cylinders.

According to some embodiments of the first aspect of the present invention, the mounting portion with be provided with the glue tie coat between the installation section of thick bamboo.

According to some embodiments of the first aspect of the present invention, the mounting portion and the diffuser are provided with a glue bonding layer therebetween.

According to the utility model discloses some embodiments of first aspect, the middle part of diffuser is provided with the hole, the installation department is provided with the cooperation the neck of hole, the neck is worn to locate the hole.

According to some embodiments of the first aspect of the present invention, the circumferential wall of the neck is provided with a radially projecting bead, the inside of the bore being provided with a cooperation the groove of the bead.

According to the utility model discloses cleaning device of second aspect embodiment contains the fan of first aspect embodiment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a fan according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a first schematic structural diagram of a housing assembly according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of the housing assembly according to the embodiment of the present invention;

fig. 5 is a cross-sectional view of a housing assembly in an embodiment of the first aspect of the invention;

fig. 6 is a schematic structural diagram of a first-stage diffuser in an embodiment of the present invention;

fig. 7 is a cross-sectional view of a first-stage diffuser according to an embodiment of the present invention.

The reference numbers are as follows:

the device comprises a shell assembly 100, a diffusion passage 101, a secondary diffusion passage 102, a mounting structure 110, a first plane 111, a first mounting hole 112, a connecting seat 113, a mounting groove 114, a neck 115, a rib 116, an outer cylinder 120, a slot 121 and a secondary blade 130;

a stator assembly 200;

a rotor assembly 300, a rotation shaft 310;

the structure comprises a first-stage diffuser 400, a second plane 401, a second mounting hole 402, an inner hole 403, a groove 404, a first-stage blade 410 and a mounting barrel 420;

an impeller 500;

a fan housing 600 and a connecting cylinder 610;

a control panel 700.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

A cleaning apparatus is an apparatus for cleaning dust, of which a vacuum cleaner is the most commonly used cleaning apparatus. The working principle of the dust collector is that a fan in the dust collector runs at a high speed, air and dust are sucked from a dust suction port, the dust is retained in a filter element, and the filtered air is discharged to the outside of the dust collector.

In the related art, a fan is a core component of a dust collector and is used as a power source of the dust collector. The main components of the fan comprise a casing, a fan cover, a diffuser and an impeller. The diffuser and the shell are kept relatively static (fixedly connected), the impeller rotates at a high speed under the drive of the rotor, and air around the impeller is thrown out under the action of centrifugal force and has larger radial and tangential speeds. On one hand, negative pressure is formed inside the fan cover, and external air continuously flows to the impeller from the air inlet of the fan cover; on the other hand, the high-speed airflow thrown out by the impeller passes through the blades on the diffuser and is finally discharged. Along with the high-speed rotation of the impeller, the fan can continuously suck air, and the functional requirements of the dust collector are met.

When the fan is in a working state, the impeller rotates to generate airflow, and the flow velocity of the airflow is reduced when the airflow flows through the diffuser, so that the kinetic energy of the airflow is converted into static pressure energy, and the pressurization is realized. Diffusers can be divided into vaned diffusers, which as the name implies, are diffusers provided with vanes, which, by their shape and angle, limit the direction of flow, forcing the flow to pass through a passage of given geometry to achieve smaller dimensions and smaller flow losses. The utility model relates to a diffuser is vaned diffuser, and following called diffuser is vaned diffuser. Specifically, the gas flow passes through a passage formed between two adjacent blades of the diffuser, and the flow velocity of the gas is reduced in the flowing process, so that the purpose of pressurization is achieved.

As shown in fig. 1, an embodiment of the first aspect of the present invention provides a blower applied to a cleaning device, the blower includes a housing assembly 100, a stator assembly 200, a rotor assembly 300, a first-stage diffuser 400, an impeller 500, a fan housing 600 and a control panel 700, the housing assembly 100 is a main body of the blower, an installation portion 110 is disposed inside the housing assembly 100, the stator assembly 200 and the rotor assembly 300 are installed in the installation portion 110, the stator assembly 200 is fixed to a stator installation portion of the installation portion 110, the rotor assembly 300 can rotate relative to the stator assembly 200, and the rotor assembly 300 and the stator assembly 200 constitute a driving mechanism; the wind shield 600 is connected to an end of the casing assembly 100, a wind guiding cavity is formed inside the wind shield 600, the wind shield 600 is hermetically connected to an outer wall of the casing assembly 100, the impeller 500 is located in the wind guiding cavity of the wind shield 600, the rotating shaft 310 of the rotor assembly 300 is fixedly connected to the impeller 500, and the rotor assembly 300 drives the impeller 500 to rotate. It should be understood that the diffuser may be one-stage or two-stage, and the following description is provided with a two-stage diffuser, where the diffuser is the one-stage diffuser 400 and the two-stage diffuser is disposed in the housing assembly 100.

The shell assembly 100 comprises an outer cylinder 120 on the outer wall and a mounting part 110 in the outer cylinder 120, a first-stage diffusion channel 101 is formed between the outer cylinder 120 and the mounting part 110, the first-stage diffusion channel 101 is annular, the first-stage diffusion channel 101 is communicated with an air guide cavity, a first-stage diffuser 400 is fixedly connected to the end part of the mounting structure 110, the first-stage diffuser 400 is provided with a plurality of first-stage blades 410, and part of the first-stage blades 410 are positioned in the first-stage diffusion channel 101; the casing assembly 100 is further provided with a secondary diffuser passage 102, the secondary diffuser passage 102 being located downstream of the primary diffuser passage 101, the secondary diffuser passage 102 having a plurality of secondary vanes 130 disposed therein to form a secondary diffuser. The control plate 700 is connected to one end of the casing assembly 100, which is away from the wind shield 600, the control plate 700 is electrically connected to the stator assembly 200, and the control plate 700 controls the driving mechanism to operate.

When the fan operates, the rotor assembly 300 drives the impeller 500 to rotate at a high speed, the impeller 500 and the fan housing 600 cooperate to generate a high-speed airflow, the high-speed airflow sequentially flows through the diffuser passage 101 and the secondary diffuser passage 102, and the airflow is decelerated and the pressure is increased by the action of the plurality of first-stage blades 410 and the plurality of second-stage blades 130 of the first-stage diffuser 400.

Referring to fig. 1 and 2, the first-stage diffuser 400 is located between the impeller 500 and the casing assembly 100, as shown in fig. 6 and 7, the first-stage diffuser 400 is provided with an installation barrel 420 extending along an axial direction, the installation barrel 420 is sleeved on the installation portion 110, at least one of the installation portion 110, the first-stage diffuser 400, the installation portion 110 and the installation barrel 420 is formed with a surface sealing structure, the surface sealing structure is used for blocking airflow from leaking from a gap between the installation portion 110 and the first-stage diffuser 400, airflow loss is prevented, and therefore efficiency of the fan is effectively improved, requirements of small volume and high power are met, and product competitiveness is improved.

It can be understood that the mounting portion 110 and the one-stage diffuser 400 are formed with at least one surface sealing structure, and the mounting portion 110 and the mounting cylinder 420 are formed with at least one surface sealing structure, and a plurality of surface sealing structures are sequentially connected along the radial direction of the casing assembly 100 to form a continuous sealing, which is beneficial to further improving the sealing performance and preventing the air flow from losing. The sequentially connected surface sealing structures may be all contact sealing of the mounting portion 110 and the opposite surface of the one-stage diffuser 400; a plurality of annular sealing surfaces may be provided between the mounting portion 110 and the one-stage diffuser 400 and connected to each other.

Referring to fig. 2, 5 and 6, the mounting portion 110 is provided with a first continuous curved surface, the first-stage diffuser 400 is provided with a second continuous curved surface, and the first continuous curved surface contacts the second continuous curved surface to form a surface sealing structure, so that continuous and comprehensive sealing is realized, the sealing performance is further improved, and the air flow loss is prevented. It should be understood that the second continuous curved surface is composed of the end surface of the one-stage diffuser 400 facing the mounting portion 110 and the inner wall surface, the end surface, etc. of the mounting barrel 420, wherein continuous means that the surfaces are connected, or rounded or curved transitions are used, which can form a continuous sealing surface. Or the first continuous curved surface and the second continuous curved surface are both smooth transition space curved surfaces, the shapes of the first continuous curved surface and the second continuous curved surface are consistent or partially consistent, comprehensive sealing or multi-layer sealing can be realized after contact, and the sealing property is improved.

As shown in fig. 3, the mounting portion 110 is provided with a first plane 111 facing the one-stage diffuser 400, and as shown in fig. 6, the one-stage diffuser 400 is provided with a second plane 401 facing the mounting portion 110, and the first plane 111 and the second plane 401 contact to form a surface sealing structure. The sealing mode of plane contact is adopted, the advantages of large contact area and good air leakage prevention performance are achieved, air flow loss is prevented, and efficiency is improved.

It is understood that the first plane 111 is provided with the first mounting hole 112, the second plane 401 is provided with the second mounting hole 402, and a fastening member (not shown) is inserted into the first mounting hole 111 and the second mounting hole 402, and the first-stage diffuser 400 is fixed to the mounting portion 110 by the fastening member, and the first plane 111 and the second plane 401 are tightly attached and sealed. Generally, the fastener adopts the screw, and first mounting hole 112 is the screw hole, and second mounting hole 402 is the through-hole, and the screw passes the through-hole and screw in the screw hole, realizes fixing, and during the dismantlement, loosen the screw can, convenient easy maintenance.

Referring to fig. 6, the second plane 401 of the first-stage diffuser 400 includes an inner ring surface and three small ring surfaces, each small ring surface surrounds one second mounting hole 402, that is, three fasteners are provided, the three fasteners are uniformly distributed along the circumferential direction of the first-stage diffuser 400, after the first-stage diffuser is assembled, each small ring surface is abutted against the first plane 111 to realize sealing, so that air flow is prevented from leaking from peripheral gaps of the fasteners, the sealing performance is improved, and the efficiency of the fan is improved. Referring to fig. 4, the mounting portion 110 is provided with a connection seat 113, and the first mounting hole 112 extends from the first plane 111 to the connection seat 113, so that the connection seat 113 is used to facilitate mounting of a fastener and improve structural strength, thereby facilitating fixing of the first-stage diffuser 400 and obtaining a stable diffuser effect.

Referring to fig. 2, 5 and 6, it can be understood that the mounting portion 110 is provided with a mounting groove 114 for receiving the mounting cylinder 420, a distance between the second plane 401 and an end surface of the mounting cylinder 420 in the axial direction of the housing assembly 100 is H1, a depth of the mounting groove 114 is H2, and H1 < H2 are required in design. During assembly, the installation barrel 420 is installed in the installation groove 114, and due to the fact that H1 < H2, the installation barrel 420 does not contact the bottom surface of the installation groove 114, the second plane 401 is not blocked from abutting against the first plane 111, and therefore abutting sealing can be achieved between the first plane 111 and the second plane 401.

It can be understood that, in the radial direction of the casing assembly 100, there is a gap between the mounting portion 110 and the mounting barrel 420, so as to facilitate assembly, the mounting barrel 420 can be easily sleeved on the mounting portion 110, and the first-stage diffuser 400 can be moved along the axial direction of the casing assembly 100, so as to prevent the mounting portion 110 and the mounting barrel 420 from interfering and affecting mounting, and further eliminate the problem that the first plane 111 and the second plane 401 cannot abut against and seal. The gap between the mounting portion 110 and the mounting tube 420 may be left untreated, and as long as the first plane 111 and the second plane 401 are in contact sealing, the air flow can be prevented from leaking away, and a sealant may be used to fill the gap to achieve sealing, thereby further improving the sealing performance.

It can be understood that glue can be used for bonding the mounting part 110 and the mounting cylinder 420, and the glue forms a glue sealing layer, so that the mounting part 110 and the mounting cylinder 420 can be fixedly connected, a gap between the mounting part 110 and the mounting cylinder 420 can be filled, air flow loss is prevented, and the sealing purpose is achieved.

Similarly, the mounting portion 110 and the first-stage diffuser 400 can be bonded by glue, and the glue can be used for realizing the fixed connection between the mounting portion 110 and the first-stage diffuser 400 and filling the gap between the mounting portion 110 and the first-stage diffuser 400, so that the air flow loss is prevented, and the sealing purpose is achieved. Here, it should be understood that it is possible to abut the first plane 111 and the second plane 401 and use glue at the same time, the glue is coated on the first plane 111 and the second plane 401, and then the first plane 111 and the second plane 401 are sealed in a fitting manner, and since the processing cannot ensure that the first plane 111 and the second plane 401 are completely flat surfaces, the glue fills the gap, and the sealing performance can be further improved.

Referring to fig. 1, the first-stage diffuser 400 has an inner hole 403 formed at a middle portion thereof, the mounting portion 110 has a neck portion 115 fitted to the inner hole 403, and the neck portion 115 is inserted into the inner hole 403 after assembly. The outer wall surface of the neck portion 115 and the inner wall surface of the inner hole 403 can be sealed in an abutting manner, so that the sealing performance is further improved, and the air flow loss is prevented. A gap may also be reserved between the neck portion 115 and the inner wall surface of the inner hole 403, the first-stage diffuser 400 can be easily sleeved on the mounting portion 110, the first-stage diffuser 400 can move along the axial direction of the casing assembly 100 conveniently, the neck portion 115 and the inner wall surface of the inner hole 403 are prevented from being clamped to affect mounting, the gap between the neck portion 115 and the inner wall surface of the inner hole 403 may not be processed, and a sealant can be used for filling the gap to realize sealing, so that the sealing performance is further improved.

As shown in the figure, the circumferential wall of the neck 115 is provided with a protruding rib 116 protruding radially, the inner wall of the inner hole 403 is provided with a groove 404 matching with the protruding rib 116, when assembling, the protruding rib 116 is aligned with the groove 404, and then the neck 115 is inserted into the inner hole 403, so that the positioning is accurate. The inner hole 403 is a circular hole, and the neck 115 is cylindrical, so that the rib 116 and the groove 404 are engaged to prevent the first-stage diffuser 400 from rotating relative to the mounting portion 110, thereby accurately positioning the first-stage diffuser 400 and facilitating stable diffusion.

Referring to fig. 1 and fig. 2, it can be understood that the fan housing 600 is provided at a periphery thereof with a connecting cylinder 610 facing the outer cylinder 120, the outer wall of the outer cylinder 120 is provided with an insertion slot 121, and the connecting cylinder 610 is inserted into the insertion slot 121, so as to realize connection and fixation of the outer cylinder 120 and the fan housing 600, and the connecting structure is located at an outer side of the outer cylinder 120, which is beneficial to reducing air flow loss. The outer cylinder body 120 and the connecting cylinder 610 can be fixed in an interference fit mode, glue can also be adopted for bonding and fixing, the glue can also be used for filling a gap between the outer cylinder body 120 and the connecting cylinder 610, air flow loss from the gap is prevented, and efficiency is improved.

It can be understood that the inner wall surface of the fan housing 600 and the inner wall surface of the outer cylinder 120 may form a smooth curved surface, and when the airflow flows in the primary diffusion channel 101 and the secondary diffusion channel 102, the smooth curved surface is beneficial to the airflow to pass through, so as to effectively reduce the airflow impact and diffusion loss, and improve the noise and efficiency of the fan operation.

It should be understood that the inner diameter of the fan housing 600 may be equal to the inner diameter of the outer cylinder 120, and the inner wall surface of the fan housing 600 and the inner wall surface of the outer cylinder 120 form a smooth cylindrical surface; or the inner wall surface of the fan cover 600 and the inner wall surface of the outer cylinder 120 may form a smooth transition curved surface, and the shape of the curved surface has various choices, so that the requirement of less airflow blockage can be met.

The embodiment of the second aspect of the utility model provides a cleaning device, cleaning device contain the fan of the embodiment of the first aspect. The blower comprises a shell assembly 100, a stator assembly 200, a rotor assembly 300, a first-stage diffuser 400, an impeller 500, a fan cover 600 and a control panel 700, wherein the shell assembly 100 is a main body of the blower, a mounting part 110 is arranged inside the shell assembly 100, the stator assembly 200 and the rotor assembly 300 are mounted in the mounting part 110, the stator assembly 200 is fixed on a stator mounting part of the mounting part 110, the rotor assembly 300 can rotate relative to the stator assembly 200, and the rotor assembly 300 and the stator assembly 200 form a driving mechanism; the wind shield 600 is connected to an end of the casing assembly 100, a wind guiding cavity is formed inside the wind shield 600, the wind shield 600 is hermetically connected to an outer wall of the casing assembly 100, the impeller 500 is located in the wind guiding cavity of the wind shield 600, the rotating shaft 310 of the rotor assembly 300 is fixedly connected to the impeller 500, and the rotor assembly 300 drives the impeller 500 to rotate. It should be understood that the diffuser may be one-stage or two-stage, and will be described below as having a two-stage diffuser, where the diffuser is the one-stage diffuser 400 and the two-stage diffuser is disposed in the housing assembly 100.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art.

Claims

1. The fan, its characterized in that includes:

the motor comprises a shell assembly, a stator assembly and a rotor assembly, wherein the shell assembly is internally provided with a mounting part which is connected with the stator assembly and the rotor assembly;

the fan cover is connected to the shell assembly;

the impeller is positioned inside the fan cover and is connected with the rotating shaft of the rotor assembly;

the diffuser, connect in the installation department, and the diffuser is located the impeller with between the casing subassembly, the diffuser is provided with along axially extended's an installation section of thick bamboo, an installation section of thick bamboo suit in the installation department, the installation department with the diffuser and an installation section of thick bamboo with at least one in the installation department is face seal structure.

2. The fan according to claim 1, wherein the mounting portion and the diffuser are formed with at least one of the surface sealing structures, and the mounting cylinder and the mounting portion are formed with at least one of the surface sealing structures, and the plurality of surface sealing structures are sequentially connected in a radial direction of the housing assembly.

3. The fan as claimed in claim 1, wherein the mounting portion is provided with a first continuous curved surface, the diffuser is provided with a second continuous curved surface, and the first continuous curved surface abuts against the second continuous curved surface to form the surface sealing structure.

4. The fan of claim 1, wherein the mounting portion is provided with a first planar surface facing the diffuser, the diffuser being provided with a second planar surface, the first planar surface and the second planar surface contacting to form the face seal structure.

5. The fan of claim 4, wherein the first plane is provided with a first mounting hole, the second plane is provided with a second mounting hole, and a fastener penetrates through the first mounting hole and the second mounting hole.

6. The fan as claimed in claim 5, wherein the mounting portion is provided with a mounting groove for receiving the mounting cylinder, a distance between the second plane and an end surface of the mounting cylinder in an axial direction of the casing assembly is H1, and a depth of the mounting groove is H2, satisfying H1 < H2.

7. The fan of claim 4, wherein the mounting portion has a gap with the mounting cylinder in a radial direction of the housing assembly.

8. The fan of claim 1 or 7, wherein a glue bond layer is provided between the mounting portion and the mounting cylinder.

9. The fan of claim 8 wherein a glue bond layer is disposed between the mounting portion and the diffuser.

10. The fan as claimed in claim 1, wherein an inner hole is formed in a middle portion of the diffuser, and the mounting portion is provided with a neck portion fitting the inner hole, the neck portion being inserted into the inner hole.

11. The fan of claim 10 wherein the peripheral wall of the neck is provided with a radially projecting rib and the interior of the bore is provided with a groove that engages the rib.

12. Cleaning apparatus, characterized in that it comprises a fan according to any one of claims 1 to 11.