Patent ID: 12188476

DETAILED DESCRIPTION

For clearer descriptions of the objectives, technical solutions, and advantages of embodiments of the present disclosure, the technical solutions of the embodiments of the present disclosure will be described clearly and completely hereinafter in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

Unless otherwise defined, the technical or scientific terms used in the present disclosure shall have the ordinary meaning as understood by those of general skill in the art to which the present disclosure belongs. The terms such as “first”, “second” and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different components. The word “comprise” or “include” and similar terms mean that elements or objects appearing before the word encompass the listed elements or objects and its equivalents appearing after the word, while other elements or objects are not excluded. The words “connected” or “connecting” and the like are not limited to physical or mechanical connection, but may include electrical connection, and the connection may be direct or indirect. The words, such as “upper”, “lower, “left” and “right” are only used to indicate a relative positional relationship. When an absolute position of the described object changes, the relative positional relationship may also change accordingly.

The detailed descriptions of known functions and components are omitted in order to keep the following description of the embodiments of the present disclosure clear and concise.

An embodiment of the present disclosure provides a fan. The fan includes: a motor stator5; an axial diffuser3, fixedly connected to the motor stator5, where the axial diffuser includes an outer cylinder31, a main body portion32arranged in the outer cylinder31, and diffuser blades33connecting the outer cylinder31and the main body portion32, the diffuser blades33separate an annular space between the outer cylinder31and the main body portion32into more than one pressure diffusion duct34, and the main body portion32is provided with a center shaft hole35; an air inlet cover2, fixedly connected to the axial diffuser3, where an impeller chamber9and an annular no-gate channel8surrounding the impeller chamber9are formed between the air inlet cover2and the axial diffuser3, the annular no-gate channel8communicates the impeller chamber9with the pressure diffusion duct34, and the air inlet cover2is provided with an air inlet21; and an impeller1, arranged in the impeller chamber9, where the impeller1is used to introduce air from the air inlet21, and to drive the air into the pressure diffusion duct34through the annular no-gate channel8to flow out from another end of the pressure diffusion duct34.

In the fan according to the embodiment of the present disclosure, the radial diffuser is cancelled and the axial diffuser3is used, so that chaotic airflow from the impeller1directly enters the axial diffuser3through the annular no-gate channel8, and tends to be stable after being guided by the diffuser blades33of the axial diffuser3, thereby reducing the generation of vortices in a flow channel. The cancellation of radial diffuser can effectively reduce wind resistance, reduce energy loss, and improve the working efficiency of the fan. As the “dynamic and static clearance” increases, the “dynamic and static interference” effect of the fan during operation is weakened and the fan noise is reduced.

The radial diffuser is generally provided with axial diffuser blades at the position of the annular no-gate channel8of the present disclosure to form a radial air passage, which is often very close to the blades. Air directly hits the front edges of the blades33of the radial diffuser after flowing out of the impeller1, so that strong “dynamic and static interference” occurs. A large number of documents have proved that the “dynamic and static interference” generated by the rotor6and the blades of the motor stator5is an important part of the fan noise. The fan according to the embodiment of the present disclosure cancels the radial diffuser, and adopts the axial diffuser3to increase the “dynamic and static clearance”, which is a very powerful means to reduce the fan noise.

Due to the cancellation of the radial diffuser, the diameter of the fan can be reduced accordingly. Thus, the problems of shortening the life of the bearing4and increasing the fan noise, as the power needs to be increased due to an increase in the diameter of the fan, are avoided.

In some embodiments, the outer diameter of the main body portion32of the axial diffuser3is equal to the outer diameter of the motor stator5, so that the air flowing out from the pressure diffusion duct34flows through the outside of the motor stator5. In the embodiment of the present disclosure, the outer diameter of the main body portion32of the axial diffuser3is equal to the outer diameter of the motor stator5, so that a fluid can flow out from the axial diffuser3through an outer ring of the motor stator5without obstacles. The air resistance is reduced and the fluid efficiency is improved since the air flows through the outside of the motor stator5.

In the embodiment of the present disclosure, the outer diameter of the main body portion32of the axial diffuser3is equal to the outer diameter of the motor stator5, but is not absolutely equal, and a certain difference therebetween is allowed. For example, the difference may be 1%, 3%, 5%, 7%, 10%, etc.

In some embodiments, one of the axial diffuser3and the motor stator5includes more than one positioning post36, and the other of the axial diffuser3and the motor stator5includes more than one positioning groove51mated with the positioning post36. The axial diffuser3and the motor stator5are fixed conveniently by providing the positioning post36and the positioning groove51on the axial diffuser3and the motor stator5correspondingly.

The positioning post36may be provided on either of the axial diffuser3and the motor stator5, while the positioning groove51may be provided on the other. For example, the positioning post36may be provided on the axial diffuser3, while the positioning groove51may be provided on the motor stator5.

In some embodiments, the positioning post36extends in an axial direction of the axial diffuser3. In an exemplary embodiment, some of the diffuser blades33of the axial diffuser3extend along the axial direction of the axial diffuser3to form the positioning posts36, and the motor stator5includes the positioning groove51. The number of the positioning posts36is not the same as the number of the diffuser blades33. In general, the number of the positioning posts36may be less than the number of the diffuser blades33. Therefore, when the positioning post36is arranged on the axial diffuser3, it may be the case that some of the diffuser blades33extend along the axial direction to form the positioning posts36. For example, 3 diffuser blades33of12diffuser blades33extend along the axial direction to form the positioning posts36. In the embodiment of the present disclosure, the diffuser blades33extend along the axial direction of the axial diffuser3to form the positioning posts36, which can make the positioning posts36be provided with enough strength without affecting the structure of the axial diffuser3, and meanwhile can reduce the consumption of material. Thus, the following situation is avoided: the thickness of a position where the positioning posts36are located, needs to be increased to improve the strength of the positioning posts36.

In an exemplary embodiment, an end of the diffuser blade33may integrally extend along the axial direction of the axial diffuser3to form the positioning post36. Alternatively, a portion of the end of the diffuser blade33extends in the axial direction of the axial diffuser3to form the positioning post36. When a portion of the end of the diffuser blade33extends along the axial direction of the diffuser3to form the positioning post36, it may, for example, the case that a side of the diffuser blade33close to the main body portion32extends along the axial direction of the axial diffuser3to form the positioning post36.

In some embodiments, the positioning post36may be formed on the main body portion32. In an exemplary embodiment, the positioning post36may be located on a position on the main body portion32corresponding to the diffuser blade33.

In some embodiments, one positioning post may be partially formed on the main body portion32and partially formed by the extension of the diffuser blade33.

In the embodiment of the present disclosure, the positioning groove51may be a hole groove or an open groove. In some embodiments, an outer peripheral surface of the motor stator5is recessed inward to form the positioning groove51. The positioning groove51formed by the outer peripheral surface of the positioning groove51recessed inward is an open groove, which can not only ensure firmly positioning, but also save material while ensuring the strength. A wall surface of the positioning groove51is a cylindrical surface, and the positioning post36is provided with a cylindrical surface mated with the wall surface of the positioning groove51. The wall surface of the positioning groove51and the corresponding mating surface of the positioning post36are cylindrical surfaces, which effectively ensures the stability of the combination of the positioning groove and positioning post.

In some embodiments, the positioning post36is a semi-cylindrical body. One side of the positioning post36is provided with a cylindrical surface mated with the wall surface of the positioning groove51, and the other side matches with a peripheral surface of the motor stator5.

In the embodiment of the present disclosure, the positioning groove51may be provided at any position on the peripheral surface of the motor stator5. In some embodiments, the positioning groove51is located on the outer peripheral surface corresponding to a tooth centerline AA of the motor stator5. The positioning groove51is provided on the outer peripheral surface opposite to the teeth of the motor stator5. There is enough space for providing the positioning groove at the position, which ensures the strength and avoids an increase in material consumption caused by additionally increasing the thickness and other dimensions of the part where the positioning groove51is located.

In the embodiment of the present disclosure, the number of the positioning grooves51and the number of the positioning posts36are not specifically limited, and may be, for example, 2, 3, 4, etc. In some embodiments, the number of the positioning grooves51and the number of the positioning posts36are 3 respectively, and the positioning grooves51and the positioning posts36are evenly distributed on their respective circumferences. Three positioning grooves51and three positioning posts36can ensure the positioning of and connection between the axial diffuser3and the motor stator5. More than one positioning grooves51are distributed on a circumference. More than one positioning posts36are also distributed evenly on a circumference. The diameters of the circumferences where the positioning grooves51and the positioning posts36are distributed respectively are the same. The positioning grooves51and the positioning posts36are evenly distributed on their respective circumferences, and when the axial diffuser3and the motor stator5are connected, it is not necessary to limit the axial diffuser3and the motor stator5in a specific orientation. Any one of the positioning posts36can be mated with any one of the positioning grooves51.

In the embodiment of the present disclosure, the fixed connection mode between the axial diffuser3and the motor stator5is not limited. For example, the axial diffuser3and the motor stator5may be bonded to each other through an adhesive, or connected by an interference fit, or connected by a threaded member, and so on.

In some embodiments, one of the axial diffuser3and the motor stator5include more than one connecting post52, and the other one of the axial diffuser3and the motor stator5includes more than one connecting hole37mated with the connecting post52. The axial diffuser3and the motor stator5are connected by the cooperation of the connecting hole37and the connection post52. For example, the connecting post52and a hole wall of the connecting hole37are fixedly connected through an adhesive. In this way, the adhesive may be applied in a specific position to avoid defects such as adhesive overflow. Alternatively, the connecting post52and the connecting hole37are fixedly connected by an interference fit.

In an exemplary embodiment, the axial diffuser3includes more than one connecting hole37, and the motor stator5includes more than one connecting post52that are mated with the connecting hole37. For example, more than one connecting hole37may be provided on the main body portion32.

In the fan according to the embodiment of the present disclosure, the corresponding connecting post52and the connecting hole37as well as the corresponding positioning post36and the positioning groove51may be included at the same time.

In some embodiments, the circle where the corresponding connecting post52and the connecting hole37are located is collinear with the axis of the circle where the corresponding positioning post36and the positioning groove51are located. In an exemplary embodiment, the radius of the circle where the corresponding connecting post52and the connecting hole37are located may be smaller than the radius of the circle where the corresponding positioning post36and the positioning groove51are located.

In some embodiments, the length of the connecting post52is less than that of the positioning post36. During assembly, the positioning of the axial diffuser3and the motor stator5may be achieved through the cooperation of the positioning post36and the positioning groove51, so that the connecting post52is aligned to the connecting hole37, which is convenient for assembly.

In some embodiments, an end face of a side of the outer cylinder31close to the air inlet cover2is provided with a first annular protrusion38, so that the end face of the outer cylinder31forms a first stepped surface, and a side of an outer wall surface of the outer cylinder31extends axially to form the first annular protrusion; the air inlet cover2is provided with a second annular protrusion22, so that an end face of the air inlet cover2connected to the outer cylinder31forms a second stepped surface. The second stepped surface is mated with the first stepped surface. The stepped surfaces are provided at a position where the outer cylinder31is connected to the air inlet cover2, so that an inner wall surface of the position where the air inlet cover2is connected to the outer cylinder31is provided with a smoother transition, thereby reducing the interference to the fluid.

In some embodiments, the number of blades of the impeller1is odd. For example, the number of blades of impeller1is 3, 5, 7, 9, 11, etc. The impeller1has an odd number of blades, which can reduce asymmetrical residual injection molding stress and reduce resonance.

In some embodiments, the number of blades of the impeller1and the number of the diffuser blades33are not a multiple of each other. The number of the diffuser blades33is a selected number which is not divided by the number of blades of the impeller1, so that the air noise can be reduced. For example, the number of blades of impeller1is 7 and the number of the diffuser blades33is 12.

In some embodiments, the number of diffuser blades33is a multiple of 3. The number of the diffuser blades33is a multiple of 3, which facilitates providing the positioning posts36. Three positioning posts36can ensure the positioning of the axial diffuser3and the motor stator5. The positioning posts36are evenly distributed on the circumference, and the assembly of the axial diffuser3and the motor stator5is used. When the positioning posts36are formed by extension of the diffuser blades33, the number of the diffuser blades33being a multiple of 3 can ensure the uniform distribution of the positioning posts36. The number of diffuser blades33may 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 blades33is a number other than a multiple of 3.

In some embodiments, the number of blades of the impeller1is less than the number of the diffuser blades33. Thus, while the blades of the impeller1meet the air suction efficiency, the number of the diffuser blades33also meets the rectification efficiency.

In some embodiments, the diffuser blades33may be inclined. That is, the axis of the diffuser blade33is not parallel to that of the axial diffuser3. The axis of the pressure diffusion duct34is also not parallel to that of the axial diffuser3. In an exemplary embodiment, an angle formed between the axis of the pressure diffusion duct34and the axis of the axial diffuser3may be 10°-45°.

In the embodiment of the present disclosure, the axial diffuser3is assembled on a motor shaft10through a bearing4. The impeller1is fixed on the motor.

The fan of the embodiment of the present disclosure further includes a rotor6and a control circuit board7. The rotor6is fixed on the motor shaft10. The control circuit board7is connected to the motor stator5.

An embodiment of the present disclosure provides a cleaning device, which includes the fan according to any of the foregoing embodiments.

In the fan of the cleaning device according to the embodiment of the present disclosure, the radial diffuser is cancelled, and the axial diffuser3is used, so that chaotic airflow from the impeller1directly enters the axial diffuser3through the annular no-gate channel8, and tends to be stable after being guided by the diffuser blades33of the axial diffuser3, thereby reducing the generation of vortices in the flow channel. The cancelation of radial diffuser can effectively reduce air resistance, reduce energy loss, and improve the working efficiency of the fan. As the “dynamic and static clearance” increases, the “dynamic and static interference” effect of the cleaning device during operation is weakened and the fan noise is reduced.

The radial diffuser is generally provided at the position of the annular no-gate channel8, which is often very close to the blades. Air directly hits the front edges of the radial diffuser blades33after flowing out of the impeller1, so that a strong “dynamic and static interference” occurs. A large number of documents have proved that the “dynamic and static interference” generated by the rotor6and the blades of the motor stator5is an important part of the fan noise. The cleaning device according to the embodiment of the present disclosure cancels the radial diffuser, and adopts the axial diffuser3to increase the “dynamic and static clearance”, which is a very powerful means to reduce the fan noise.

Due to the cancellation of the radial diffuser, the diameter of the fan can be reduced accordingly. Thus, the problems of shortening the life of the bearing4and increasing the fan noise, as the power needs to be increased due to an increase in the diameter of the fan, are avoided.

The cleaning device according to the embodiment of the present disclosure includes a sweeping robot, a hand-held vacuum cleaner, and the like.

The above description is intended to be illustrative rather than restrictive. For example, the above-described examples (or one or more schemes of them) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations. The scope of the present disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

Reference numerals in the accompanying drawings:

1—impeller;2—air inlet cover;21—air inlet;22—second annular protrusion;3—axial diffuser;31—outer cylinder;32—main body portion;33—diffuser blade;34—pressure diffusion duct;35—central shaft hole;36—positioning post;37—connecting hole;38—first annular protrusion;4—bearing;5—motor stator;51—positioning groove;52—connecting post;6—rotor;7—control circuit board;8—annular no-gate channel;9—impeller chamber; and10—motor shaft.