Patent ID: 12209591

LIST OF REFERENCE NUMERALS

1: fluid module;2: stator module;11: fan blade;12: diffuser;13: air inlet hood;14: rotor;15: bearing;16: annular grateless channel;17: impeller chamber;18: plain shaft;21: motor stator;22: PCB;121: first positioning mechanism;122: outer cylinder;123: main body;124: diffuser vane;125: diffusion duct;126: central shaft hole;127: connecting hole;128: first annular protrusion;131: air inlet;132: second annular protrusion;211: second positioning mechanism;212: connecting column;213: stator outer ring;214: stator tooth;215: winding coil;216: stator slot;2131: stator unit;2141: arc-shaped structure;2151: first coil;2152: second coil;2153: third coil;2154: fourth coil;2155: fifth coil;2156: sixth coil; and2161: stator slot notch.

DETAILED DESCRIPTION

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown inFIG.1, in a first aspect of embodiments of the present invention, a fan is provided, including: a fluid module1configured to generate and guide an airflow, the fluid module1including fan blades11and a diffuser12, the diffuser12having a first positioning mechanism121; and a stator module2detachably connected to the diffuser12, the stator module2being provided with a second positioning mechanism211matched with the first positioning mechanism121.

As shown inFIGS.2to7, in an optional embodiment of the present invention, the fluid module1further includes a plain shaft18and a rotor14arranged on the plain shaft18in a sleeving manner. The rotor14rotates under the driving of the stator module2, and accordingly drives the fan blades11to rotate, thereby generating the airflow. The rotor14is a permanent magnet with two poles.

Optionally, the diffuser12is an axial diffuser12. The axial diffuser12includes an outer cylinder122, a main body123arranged in the outer cylinder122, and a plurality of diffuser vanes124. The diffuser vanes124connect the outer cylinder122and the main body123, and divide an annular space between the outer cylinder122and the main body123into a plurality of diffusion ducts125. The main body123has a central shaft hole126. The main body123is arranged on the plain shaft18in a sleeving manner through the central shaft hole126. In the fan according to the embodiments of the present disclosure, radial diffusion is cancelled, and the axial diffuser12is adopted. A chaotic airflow from the fan blades11passes through the annular grateless channel16and directly enters the axial diffuser12, and is guided by the diffuser vanes124of the axial diffuser12. After that, the flow of the airflow tends to be stable, which reduces the generation of vortices in the flow channel. By cancelling the radial diffusion, wind resistance can be effectively reduced, thereby reducing energy loss, and improving the working efficiency of the fan. By increasing a “dynamic and static gap”, a “dynamic and static interference” effect of the fan in use is weakened, and the noise of the fan is reduced. A radial diffuser12is generally provided with radial diffuser vanes at the position of the annular grateless channel16of the present disclosure to form radial ducts, which are often very close to the blades. The airflows out from the fan blades11and then directly hit the leading edges of the radial diffuser vanes124, causing a severe “dynamic and static interference”. A large number of documents have proved that the “dynamic and static interference” generated by the rotor14and the vanes of the motor stator21is a main factor causing the fan noise. The fan according to the embodiment of the present disclosure cancels the radial diffuser12, and adopts the axial diffuser12to increase the “dynamic and static gap”, which is a very effective way to reduce the noise of the fan. Due to the elimination of the radial diffuser12, the diameter of the fan can be reduced accordingly. Thus, it avoids problems such as shortening the service life of a bearing15and increasing the noise of the fan caused by increase of the power along with the increase of the diameter of the fan.

Optionally, the fluid module1further includes an air inlet hood13. The air inlet hood13is fixedly connected to the axial diffuser12, wherein a fan blade chamber and an annular grateless channel16surrounding the fan blade chamber are formed between the air inlet hood13and the axial diffuser12. The annular grateless channel16enables the fan blade chamber to communicate with the diffusion ducts125, and the air inlet hood13has an air inlet131. The fan blades11are arranged in the fan blade chamber, and are configured to introduce air from the air inlet131; and the air is driven by the fan blades11to enter the diffusion ducts125through the annular grateless channel16, and flows out from the other ends of the diffusion ducts125.

Optionally, the outer diameter of the main body123of the axial diffuser12is equal to the outer diameter of the motor stator21, such that the air flowing out from the diffusion ducts125flows through the outside of the motor stator21. In the embodiment of the present disclosure, the outer diameter of the main body123of the axial diffuser12is equal to the outer diameter of the motor stator21, such that the fluid can flow out from the axial diffuser12through the outer ring of the motor stator21without obstacles. Flowing through the outside of the motor stator21reduces wind resistance and improves fluid efficiency. In the embodiment of the present disclosure, the outer diameter of the main body123of the axial diffuser12being equal to the outer diameter of the motor stator21does not mean that they are absolutely equal, and an error therebetween is allowable. For example, the error between the two is 1%, 3%, 5%, 7%, 10%, etc.

Optionally, a first annular protrusion128is arranged on an end face of the outer cylinder122close to the air inlet hood13, such that the end face of the outer cylinder122forms a first stepped face, and a side of an outer wall surface of the outer cylinder122extends axially to form the annular protrusion. The air inlet hood13has a second annular protrusion132, such that an end face of the air inlet hood13connected to the outer cylinder122forms a second stepped face matched with the first stepped face. Stepped faces are provided at the place where the outer cylinder122is connected to the air inlet hood13, such that the transition of the inner wall surface of the place where the air inlet hood13and the outer cylinder122are connected can be smoother, thereby reducing interference to the fluid.

Optionally, the number of the fan blades11is an odd number. For example, the number of the fan blades11is 3, 5, 7, 9, 11 and so on. The number of the fan blades11being an odd number can reduce asymmetric residual stress of injection molding and reduce resonance.

Optionally, the number of the fan blades11and the number of the diffuser vanes124are not multiples of each other. The number of the diffuser vanes124may be a number that cannot be divided by the number of the fan blades11, such that air noise can be reduced. For example, the number of the fan blades11is 7, and the number of the diffuser vanes124is 12.

Optionally, the number of the diffuser vanes124is a multiple of 3. The number of the diffuser vanes124being a multiple of 3 facilitates the set of positioning columns. Three positioning columns can ensure the positioning of the axial diffuser12and the motor stator21. The positioning columns are uniformly distributed on the circumference, and are assembled by using the assembling of the axial diffuser12and the motor stator21. When the positioning columns are formed by the extension of the diffuser vanes124, the number of the diffuser vanes124being a multiple of 3 can ensure the uniform distribution of the positioning columns. The number of the diffuser vanes124may be, for example, 9, 12, 15, or the like. Of course, in the embodiment of the present disclosure, it is not excluded that the number of the diffuser vanes124is a number other than a multiple of 3.

Optionally, the number of the fan blades11is less than the number of the diffuser vanes124. While the number of the fan blades11satisfies the requirement of air extraction efficiency, the number of the diffuser vanes124also satisfies the requirement of the rectification efficiency. In some embodiments, the number of the fan blades11is 9, and the number of the diffuser vanes124is 12.

Optionally, the diffuser vanes124may be inclined. That is, the diffuser vanes124are not parallel to the axis of the axial diffuser12. The axis of the diffusion duct125is not parallel to the axis of the axial diffuser12either. In an exemplary embodiment, an included angle formed between the axis of the diffusion duct125and the axis of the axial diffuser12may be 10° to 45°.

Optionally, the axial diffuser12is assembled on the motor shaft through the bearing15. The fan blades11are fixed on the motor. The fan in the cleaning device such as the vacuum cleaner according to the embodiment of the present disclosure cancels the radial diffusion, and adopts the axial diffuser12. The chaotic airflow from the fan blades11passes through the annular grateless channel16and directly enters the axial diffuser12, and is guided by the diffuser vanes124of the axial diffuser12. After that, the flow of the airflow tends to be stable, which reduces the generation of vortices in the flow channel. By cancelling the radial diffusion, wind resistance can be effectively reduced, thereby reducing energy loss, and improving the working efficiency of the fan. By increasing a “dynamic and static gap”, a “dynamic and static interference” effect of the fan in use is weakened, and the noise of the fan is reduced. A radial diffuser12is generally provided at the position of the annular grateless channel16, which are often very close to the vanes. The airflows out from the fan blades11and then directly hit the leading edges of the radial diffuser vanes124, causing a severe “dynamic and static interference”. A large number of documents have proved that the “dynamic and static interference” generated by the rotor14and the vanes of the motor stator21is a main factor causing the fan noise. The fan of the cleaning device such as the vacuum cleaner according to the embodiment of the present disclosure cancels the radial diffuser12, and adopts the axial diffuser12to increase the “dynamic and static gap”, which is a very effective way to reduce the noise of the fan. Due to the elimination of the radial diffuser12, the diameter of the fan can be reduced accordingly. Thus, it avoids the problems such as shortening the service life of the bearing15and increasing the noise of the fan caused by increase the power along with the increase of the diameter of the fan.

Optionally, the first positioning mechanism121is formed by part of the diffuser vanes124of the axial diffuser12extending along an axial direction of the axial diffuser12.

Optionally, the stator module2includes the motor stator21provided with the second positioning mechanism211matched with the first positioning mechanism121.

Optionally, the motor stator21includes an annular stator outer ring213and winding coils215, wherein a plurality of uniformly distributed stator teeth214is connected onto the inner side of the stator outer ring213in a circumferential direction, and is arranged along a radial direction of the stator outer ring213. The number of the wind coil215corresponds to the number of the stator teeth214, and each stator tooth214is sleeved with one wind coil215, wherein a yoke of the stator outer ring213is provided with the second positioning mechanism211matched with the first positioning mechanism121.

Optionally, the second positioning mechanism211is formed by the yoke of the stator outer ring213recessing inward.

Optionally, the first positioning mechanism and the second positioning mechanism211may be a positioning member and a fastener that form a snap-fit structure, or may be a bolt and a threaded hole that form a threaded connection, or may be a positioning column and a positioning hole in the above embodiment.

Optionally, one of the axial diffuser12and the motor stator21includes a plurality of positioning columns, and the other of the axial diffuser12and the motor stator21includes a plurality of positioning holes matched with the positioning columns. By arranging the positioning columns and the positioning holes on the axial diffuser12and the motor stator21respectively, the connection and fixation of the axial diffuser12and the motor stator21are convenient. The positioning columns may be provided on either of the axial diffuser12and the motor stator21, and the positioning holes are formed on the other. For example, the positioning columns may be provided on the axial diffuser12, and the positioning holes are formed on the motor stator21.

Optionally, the positioning columns extend along the axial direction of the axial diffuser12. In an exemplary embodiment, part of the diffuser vanes124of the axial diffuser12extend along the axial direction of the axial diffuser12to form positioning columns, and the motor stator21includes the positioning holes. The number of the positioning columns is different from the number of the diffuser vanes124. In general, the number of the positioning columns may be less than the number of the diffuser vanes124. Therefore, when the positioning columns are arranged on the axial diffuser12, part of the diffuser vanes124can extend along the axial direction to form the positioning columns. For example, 3 of the12diffuser vanes124extend axially to form the positioning columns. In the embodiment of the present disclosure, the diffuser vanes124extend along the axial direction of the axial diffuser12to form the positioning columns, which can make the positioning columns have sufficient strength without affecting the structure of the axial diffuser12, and can reduce material consumption. Thus, the need to increase the thickness of the place where the positioning columns are disposed in order to improve the strength of the positioning columns is avoided. In an exemplary embodiment, the whole ends of the diffuser vanes124may extend along the axial direction of the axial diffuser12to form the positioning columns. It is also possible that part of the ends of the diffuser vanes124extends along the axial direction of the axial diffuser12to form the positioning columns. For example, when part of the ends of the diffuser vanes124extends along the axial direction of the axial diffuser12to form the positioning columns, the sides of the diffuser vanes124close to the main body123may extend along the axial direction of the axial diffuser12to form the positioning columns.

Optionally, the positioning columns may be formed on the main body123. In an exemplary embodiment, the positioning columns may be disposed at positions of the main body123corresponding to the diffuser vanes124.

Optionally, one positioning column may be formed partly on the main body123and formed partly by the extension of the diffuser vanes124.

In the above embodiment, the positioning hole may be a hole slot or an open slot. In some embodiments, the peripheral surface of the motor stator21is recessed inward to form the positioning holes. The peripheral surfaces of the positioning holes are recessed inward to form the open slots, which not only ensures stable positioning, but also saves materials while ensuring strength. The wall surfaces of the positioning holes are cylindrical surfaces, and the positioning columns have cylindrical surfaces matched with the wall surfaces of the positioning holes. The wall surfaces of the positioning holes and the corresponding adapted surfaces of the positioning columns being cylindrical surfaces can effectively ensure the stability of the combination of the two.

Optionally, the positioning column is a semi-cylinder. One side of the positioning column has a cylindrical surface matched with the wall surface of the positioning hole, and the other side is matched with the peripheral surface of the motor stator21. In the embodiment of the present disclosure, the positioning hole may be disposed at any position on the peripheral surface of the motor stator21. In some embodiments, the positioning hole is disposed on the peripheral surface corresponding to the tooth centerline of the motor stator21. The positioning hole is formed on the peripheral surface opposite to the teeth of the motor stator21. There is enough space for disposing positioning holes in this part, and the strength is ensured, without increasing the thickness and other dimensions of the part where the positioning holes are disposed. Thus, it avoids the increase of the material consumption. In the embodiment of the present disclosure, the number of the positioning holes and the number of the positioning columns are not specifically limited, for example, they may be 2, 3, 4, etc. In some embodiments, there are three positioning holes and three positioning columns respectively, and the positioning holes and positioning columns are uniformly distributed on the respective circumferences. Three positioning holes and three positioning columns respectively can ensure the positioning connection between the axial diffuser12and the motor stator21. The positioning holes are distributed on a circumference. The positioning columns are also distributed evenly on a circumference. The diameters of the two circumferences are the same. The positioning holes and the positioning columns are uniformly distributed on their respective circumferences. When the axial diffuser12and the motor stator21are connected, it is not necessary to limit the two in a specific orientation. Any positioning column can be matched with any positioning hole. In the embodiment of the present disclosure, the method of the fixed connection between the axial diffuser12and the motor stator21is not limited. For example, the axial diffuser12and the motor stator21may be bonded by glue, or connected by an interference fit, or connected by a screw or the like.

Optionally, one of the axial diffuser12and the motor stator21includes a plurality of connecting columns212, and the other one of the axial diffuser12and the motor stator21includes a plurality of connecting holes127matched with the connecting columns212. The axial diffuser12and the motor stator21are connected to each other by the cooperating of the connecting columns212and the connecting holes127. For example, the connecting columns212and the hole walls of the connecting holes127are fixedly connected by glue. In this way, glue can be applied in a specific position to avoid defects such as glue overflow. Alternatively, the connecting columns212and the connecting holes127are fixedly connected by interference fit. In an exemplary embodiment, the axial diffuser12includes a plurality of connecting holes127, and the motor stator21includes a plurality of connecting columns212matched with the connecting holes127. For example, the connecting holes127may be formed on the main body123. In the fan according to the embodiment of the present disclosure, both corresponding connecting columns212and connecting holes127and corresponding positioning columns and positioning holes may be included.

Optionally, the axis lines of the circles where the corresponding connecting columns212and connecting holes127are disposed are collinear with the axis lines of the circles where the corresponding positioning columns and positioning holes are disposed. In an exemplary embodiment, the radii of the circles where the corresponding connecting columns212and connecting holes127are disposed may be smaller than the radii of the circles where the corresponding positioning columns and positioning holes are disposed.

Optionally, the length of the connecting column212is less than the length of the positioning column. During assembling, the positioning of the axial diffuser12and the motor stator21can be achieved through the cooperation of the positioning columns and the positioning holes, such that the connecting columns212correspond to the connecting holes127for easy assembling.

Optionally, one of the axial diffuser12and the motor stator21includes a plurality of positioning columns, and the other of the axial diffuser12and the motor stator21includes a plurality of positioning holes matched with the positioning columns. By arranging the positioning columns and the positioning holes on the axial diffuser12and the motor stator21respectively, the connection and fixation of the axial diffuser12and the motor stator21are convenient. The positioning columns may be provided on either of the axial diffuser12or the motor stator21, and the positioning holes are formed on the other. For example, the positioning columns may be provided on the axial diffuser12, and the positioning holes are formed on the motor stator21.

Optionally, the positioning columns extend along the axial direction of the axial diffuser12. In an exemplary embodiment, part of the diffuser vanes124of the axial diffuser12extend along the axial direction of the axial diffuser12to form the positioning columns, and the motor stator21includes the positioning holes. The number of the positioning columns is different from the number of the diffuser vanes124. In general, the number of the positioning columns may be less than the number of the diffuser vanes124. Therefore, when the positioning columns are arranged on the axial diffuser12, part of the diffuser vanes124may extend along the axial direction to form the positioning columns. For example, 3 of the12diffuser vanes124extend axially to form the positioning columns. In the embodiment of the present disclosure, the diffuser vanes124extend along the axial direction of the axial diffuser12to form the positioning columns, which can make the positioning columns have sufficient strength without affecting the structure of the axial diffuser12, and can reduce material consumption. Thus, the need to increase the thickness of the place where the positioning columns are disposed in order to improve the strength of the positioning columns is avoided. In an exemplary embodiment, the whole ends of the diffuser vanes124may extend along the axial direction of the axial diffuser12to form the positioning columns. It is also possible that part of the ends of the diffuser vanes124extends along the axial direction of the axial diffuser12to form the positioning columns. For example, when part of the ends of the diffuser vanes124extends along the axial direction of the axial diffuser12to form the positioning columns, the sides of the diffuser vanes124close to the main body123may extend along the axial direction of the axial diffuser12to form the positioning columns.

Optionally, the positioning columns may be formed on the main body123. In an exemplary embodiment, the positioning columns may be disposed at positions of the main body123corresponding to the diffuser vanes124.

Optionally, one positioning column may be formed partly on the main body123and formed partly by the extension of the diffuser vanes124. In the above embodiments of the present disclosure, the positioning hole may be a hole slot or an open slot. In some embodiments, the peripheral surface of the motor stator21is recessed inward to form the positioning holes. The peripheral surfaces of the positioning holes are recessed inward to form the open slots, which not only ensures stable positioning, but also saves materials while ensuring strength. The wall surfaces of the positioning holes are cylindrical surfaces, and the positioning columns have cylindrical surfaces matched with the wall surfaces of the positioning holes. The wall surfaces of the positioning holes and the corresponding adapted surfaces of the positioning columns being cylindrical surfaces can effectively ensure the stability of the combination of the two.

Optionally, the axis lines of the circles where the corresponding connecting columns212and connecting holes127are disposed are collinear with the axis lines of the circles where the corresponding positioning columns and positioning holes are disposed. In an exemplary embodiment, the radii of the circles where the corresponding connecting columns212and connecting holes127are disposed may be smaller than the radii of the circles where the corresponding positioning columns and positioning holes are disposed.

Optionally, the length of the connecting column212is less than the length of the positioning column. During assembling, the positioning of the axial diffuser12and the motor stator21can be achieved through the cooperation of the positioning columns and the positioning holes, such that the connecting columns212correspond to the connecting holes127for easy assembling.

As shown inFIGS.8to11, in an optional embodiment of the present invention, the stator teeth214are arranged along the radial direction of the stator outer ring213. The outside of each stator tooth214is provided with a winding coil215in a sleeving manner. The winding coil215is provided with only two ends that are connected to a positive electrode and a negative electrode of a power supply, respectively. In other words, in this embodiment, the span of the winding coil215is equal to 1. The winding coil215adopting a span of 1 tooth can improve the production efficiency. The coil is bundled on one tooth, which can improve the rigidity of both the coil and the iron core and reduce noise.

Optionally, one end of the stator teeth214away from the stator outer ring213is recessed inward to form an arc-shaped structure. The arc-shaped structures of two adjacent stator teeth214are not connected, such that two adjacent stator teeth214and the stator outer ring213form a stator slots216, the arc-shaped structures of two adjacent stator teeth214are separated by a predetermined distance in the circumferential direction, and the space between the two arc-shaped structures in the circumferential direction is the notch of the stator slot216.

It can be understood that, in the prior art, for coils with a span greater than 1, it is required to prepare the winding coil215according to a predetermined number of turns during assembling of the stator, and then insert the winding coil215into the stator slot216, instead of directly sleeving the stator teeth214with the coil. For example, for coils with a span of 2, a first coil2151has only one end which is connected to the positive electrode, and a fourth coil also has only one end which is connected to the negative electrode. After the coils are assembled, it is also required to connect the positive electrode of the first coil to the fourth coil across two coils, which will cause relatively long invalid copper wire, resulting in waste of copper wire, high resistance, high copper loss, and low efficiency.

After a lot of research, the inventor has determined that for the winding coil215with a span of 1, although the winding coefficient is low, that is, the output torque of this coil is small under the same current. However, the span is 1, that is, the winding coil215has two ends which are respectively connected to the positive electrode and the negative electrode, thus, the ineffective copper wire at the end of the winding coil215is short, the copper loss of the copper wire is small, and the efficiency is high. Although the winding coefficient of the coil with a span greater than 1 is high, because the coil needs to be connected across the stator teeth214, the invalid copper wire at the end will be long, the resistance will be large, and the copper loss will be high. Because of the high copper loss, the rotation efficiency of the stator is basically equal to the efficiency of the coils with the span of 1 in the present invention. For the coils of the present invention having the span of 1, the consumption of connecting wires and copper is reduced, and the coils can be bundled on the stator teeth214, such that the rigidity of the stator teeth214is improved, improving the production efficiency and the use efficiency of the stator.

It should be noted that, in the present invention, the stator outer ring213is connected to an even number of uniformly distributed stator teeth214, and the number of the stator slots216in the present invention is the same as the number of the stator teeth214, and namely, is also an even number. In other words, the number of the stator slots216in the present invention is also an even number, which can reduce the unbalanced radial magnetic pull force of the stator during rotation, reduce electromagnetic vibration, and reduce the noise of the motor during use. The outer stator ring213is formed by a plurality of ring sector-shaped stator units2131connected in a chain. Each stator unit2131is connected to the stator tooth214. In this embodiment, the stator unit2131is made of high-frequency silicon steel. By providing the stator outer ring213formed by a plurality of ring sector-shaped stator units2131connected in a chain, two chain stator outer rings213may be arranged crossly during machining of the stator outer ring213. That is, the stator teeth214of the second stator outer ring213are arranged between the two stator teeth214of the first stator outer ring213, which can enable a mold to produce two stator outer rings213by one punching. Moreover, the two stator outer rings213are staggered, which can greatly save silicon steel sheets compared to producing one stator outer ring213by once punching. In addition, since the stator outer ring213is chain-connected in this embodiment, a wire can be directly wound on each stator tooth214, such that all the stator teeth214are wound at the same time, which improves production efficiency and avoids a process of embedding the coil in the stator slot216. Thus, the production efficiency of the stator is improved. Moreover, the stator outer ring213according to the embodiment of the present invention can also enable the coils to neatly and tightly wrap the stator teeth214, such that the stator teeth214can be protected as the rigidity of the stator teeth214is improved, and the tight coils can be reduced. In addition, it is worth mentioning that in the prior art, the winding coil215is embedded in the stator slot216, and then is fixed in the stator slot216; and in order to increase a slot fullness rate of the stator slot216, it is required to arrange more windings. Compared with filling the coils in the stator slots216, in the present invention, a tight winding can be acquired by winding the wires directly on the stator teeth214, and the same slot fullness ratio can be realized with less copper wires.

Optionally, the stator outer ring213is formed by connecting the first stator unit2131and the last stator unit2131after the stator teeth214are wound, and using laser welding to connect the connecting lines of all adjacent stator units2131.

Optionally, the circle enclosed by the arc-shaped structure of the stator teeth214is used to accommodate the rotor14having two poles.

The number of the stator teeth214is 6, the number of the stator slots216is also6, and the number of phases of the stator is 3.

Optionally, when the number of the stator teeth214is 6 and the number of phases of the stator is 3, the included angles of two coils belonging to the same phase differ by 180°.

Optionally, the above six winding coils215are wound in a “Y” connection or delta connection manner.

In this embodiment, the number of parallel branches in the winding coils215belonging to the same phase is 1. That is, the head end of the first winding coil215in the same phase and the tail end of the second winding coil215in the same phase are connected, such that a branch is formed. That is, the winding coils215of the same phase are connected in series. The six stator coils respectively include: a first coil2151, a second coil2152, a third coil2153, a fourth coil2154, a fifth coil2155, and a sixth coil2156arranged clockwise or counterclockwise along the circumferential direction of the stator outer ring213.

The first coil2151and the fourth coil2154are set as an A phase, the second coil2152and the fifth coil2155are set as a B phase, the third coil2153and the sixth coil2156are set as a C phase, and an included angle between two coils belonging to the same phase is 180°, and two coils belonging to the same phase are separated and connected in series to form a branch.

The number of parallel branches in the winding coils215belonging to the same phase is 2. That is, the head end of the first winding coil215in the same phase and the head end of the second winding coil215in the same phase are connected, and the tail ends of the first winding coil215in the same phase and the tail end of the second winding coil215in the same phase are connected, such that two branches are formed. That is, the winding coils215in the same phase are connected in parallel.

The six stator coils respectively include: a first coil2151, a second coil2152, a third coil2153, a fourth coil2154, a fifth coil2155, and a sixth coil2156arranged clockwise or counterclockwise along the circumferential direction of the stator outer ring213. The first coil2151and the fourth coil2154are set as an A phase, the second coil2152and the fifth coil2155are set as a B phase, the third coil2153and the sixth coil2156are set as a C phase. The two coils belonging to the same phase are separated and connected in parallel to form two branches.

The yoke of the stator is provided with a semicircular hole for positioning the axial diffuser12of the fan. The center of the semicircular hole is set on the centerline of the stator teeth214.

Optionally, the stator module2further includes a PCB22detachably connected to the motor stator21. Two ends of each winding coil215extend along an axial direction of the motor stator21to the side of the motor stator21connected to the PCB22. The PCB22is provided with a connection circuit of the winding coils215of the same phase, and the winding coils215belonging to the same phase are connected through the PCB22. Specifically, the winding coils215belonging to the same phase are connected through the connection circuit of the winding coils215of the same phase on the PCB22. Thus, the coils can be arranged neatly and the volume of the fan can be reduced.

In another aspect of the embodiments of the present invention, a cleaning device is also provided. The cleaning device is provided with the fan according to any one of the above embodiments.

The cleaning device in the embodiments of the present disclosure includes a cleaning robot, a hand-held vacuum cleaner, and the like.

The present invention aims to protect a fan, including: a fluid module1configured to generate and guide an airflow, the fluid module1including a diffuser12, the diffuser12having a first positioning mechanism on121; and a stator module2detachably connected to the diffuser12, the stator module2being provided with a second positioning mechanism211matched with the first positioning mechanism121. The fan adopts a modular structure, such that the assembling is simple, which is suitable for mechanized production.

It should be understood that the above specific embodiments of the present invention are only intended to illustrate or explain the principle of the present invention, but not to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. Furthermore, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalents of such scope and boundaries.