Electric machine for household appliances and household appliance

Abstract

The application relates to the technical field of household appliances, in particular to a motor for a household appliance, comprising: a stator; a rotor rotating relative to the stator about a rotation axis; a first housing part and a second housing part and a fastener, the fastener being configured to fasten the first housing part and the second housing part to each other in a mating posture to form an accommodation space at least partially accommodating the stator, the first housing part having an opening allowing the fastener to pass through, the second housing part having an accommodation part accommodating the fastener; and a positioning part at least partially located in the opening and at least partially surrounding the fastener in an assembled state of the motor, which guides the fastener to position the first housing part and the second housing part relative to each other in the mating posture during assembly. The application also relates to a household appliance. Thus, the positioning part forms a guiding mechanism during assembly, which reduces the product rejection rate caused by poor centering, guarantees the air gap uniformity between the stator and the rotor, and reduces the motor operation noise.

Description

Technical Field

[0001] This application relates to the technical field of household appliances, specifically to a motor for a household appliance and a household appliance. Background Technology

[0002] With the continuous development of modern home appliance technology, consumers have increasingly higher performance requirements for home appliance products, especially in terms of noise control, operational stability, and service life. As the core power source for various home appliances, the performance of the motor directly affects the user experience of the end product. A typical motor usually consists of a fixed stator assembly and a rotatable rotor assembly, both enclosed and fixed within a housing assembled from multiple components. This housing not only provides structural support and physical protection for the stator and rotor, but its assembly precision also plays a decisive role in the overall performance of the motor. In conventional motor manufacturing processes, the motor housing typically consists of at least two housing components, such as the main housing (Case) and the end cover (Cover). These housing components need to be connected and fastened with fasteners (usually metal screws) to form a closed internal space that can accommodate the stator and rotor assemblies. However, in actual manufacturing processes, traditional screw fastening methods have many technical defects. First, operators are prone to tilting the screws in when installing them because they may not align the screw holes on the two housing components. This tilted installation not only increases assembly difficulty and reduces production efficiency, but may also damage threads, causing parts to be scrapped and increasing production costs. More importantly, even if the screws can be installed with difficulty, the forced assembly during the installation process may have caused relative misalignment between the housing components. This misalignment will directly affect the uniformity of the air gap between the rotor and stator inside the motor. The direct consequence of uneven air gap is increased vibration and noise during motor operation, seriously affecting the user experience.

[0003] Therefore, there is still a real need for continued structural improvements to the motors used in household appliances. Summary of the Invention

[0004] In view of this, the purpose of embodiments of this application is to provide an improved motor for a household appliance and an improved household appliance, so as to overcome at least one of the above-mentioned disadvantages and / or other possible disadvantages not mentioned herein.

[0005] According to a first aspect of this application, a motor for a household appliance is provided, the motor comprising: a stator; a rotor configured to rotate relative to the stator about a rotation axis; a first housing member and a second housing member; and a fastener configured to fasten the first housing member and the second housing member relative to each other in a mating posture to form a receiving space that at least partially accommodates the stator, wherein the first housing member has an opening configured to allow the fastener to pass through, and the second housing member has a receiving portion configured to accommodate the fastener; and a positioning member at least partially located within the opening and at least partially surrounding the fastener in an assembled state of the motor, the positioning member being configured to guide the fastener during assembly to position the first housing member and the second housing member relative to each other in a mating posture. Thus, during assembly, the positioning member is at least partially located within the opening of the first housing member and at least partially surrounds the fastener, forming a guiding mechanism. When an operator or equipment inserts the fastener, the positioning member can automatically guide the fastener to the correct installation path, ensuring that the first housing member and the second housing member are fastened to each other in an accurate mating posture. This design significantly reduces assembly difficulty, improves production efficiency, and reduces product scrap rates caused by misalignment. More importantly, proper alignment ensures uniform air gap between the stator and rotor, thereby reducing motor operating noise and improving motor performance.

[0006] According to an optional embodiment, the opening has a first central axis, and the receiving portion has a second central axis, wherein the first central axis coincides with the second central axis in the mating posture of the first housing member and the second housing member. This axis coincidence design ensures proper mating between the first and second housing members, eliminating axial offsets and angular deviations that may occur in conventional assembly methods. When the two central axes are completely coincident, the fastener can be smoothly inserted along a predetermined straight path, avoiding assembly defects that may be caused by oblique insertion.

[0007] According to one alternative embodiment, the positioning element is configured to allow the fastener to move relative to the positioning element during assembly. This relative movement capability ensures that the positioning element guides the fastener without generating excessive resistance, thus ensuring a smooth assembly process.

[0008] According to an optional embodiment, in the assembled state of the motor, the first central axis and the second central axis are parallel to the rotation axis. This parallelism ensures that the direction of the fastening force is consistent with the main force direction of the motor, improving structural stability.

[0009] According to an optional embodiment, the positioning element is constructed as an elastomer made of an elastic material. Thus, in terms of assembly alignment, the elastic material transforms the original rigid contact problem into a flexible contact problem. When the positioning element contacts the opening of the first housing member, if there is a positional deviation, the elastic material can absorb and compensate for this deviation through its own elastic deformation such as compression and shear, while generating a restoring force proportional to the amount of deformation. This restoring force acts on the first housing member, driving it to undergo slight translation or rotation until the center of its opening aligns with the fastener axis, thereby achieving automatic alignment. Furthermore, during motor operation, the presence of the elastomer plays a crucial role in vibration damping and anti-loosening. When the fastener is tightened, the elastic positioning element is in a continuous compressed state, acting like a high-performance spring washer, providing a continuous axial preload between the fastener head and the housing surface. Vibrations generated during motor operation, especially high-frequency vibrations, are effectively absorbed and damped by this elastomer, rather than being directly transmitted to the threaded pair of the fastener. This significantly reduces the risk of fretting wear and eventual loosening of the threaded pair due to cyclic vibration.

[0010] According to one alternative embodiment, in the assembled state of the motor, the positioning element completely surrounds the fastener. This fully enclosed structure ensures that any misalignment of the fastener in any direction can be corrected, achieving omnidirectional automatic alignment. The complete enclosed structure also means a larger contact area between the positioning element and the fastener, which not only improves the accuracy of guidance but also enhances the friction between them, helping to prevent the fastener from loosening.

[0011] According to one alternative embodiment, the motor is constructed as an external rotor motor. Therefore, external rotor motors are typically used in applications requiring high torque and low speed, such as the fan drive of a range hood. These applications have high requirements for vibration and noise control. By improving the assembly accuracy of the motor housing components through positioning elements, the vibration and noise levels of the external rotor motor can be significantly reduced, thus improving the overall quality of the product.

[0012] According to one alternative embodiment, the first housing member and the second housing member are stamped parts made of sheet metal. Thus, by using positioning elements to improve the assembly accuracy of the housing members, precise assembly of these stamped parts can be achieved.

[0013] According to an optional embodiment, in the assembled state of the motor, the positioning member is at least partially in a compressed state. This compressed state means that the positioning member stores elastic potential energy, which is converted into continuous pressure, providing additional protection for the fastened connection. Here, the radial force generated by compression ensures that the positioning member fits tightly against the inner wall of the opening, preventing relative movement under vibration. Furthermore, the axial compressive force provides preload to the fasteners, compensating for any loosening that may occur in the threaded connection during use. The compressed positioning member also exhibits better vibration damping performance, effectively absorbing and dissipating vibration energy. This design ensures a reliable connection for the motor under various operating conditions, significantly improving product reliability, especially in applications like range hoods that require long-term continuous operation.

[0014] According to one alternative embodiment, the positioning element is constructed as an O-ring made of rubber material. Thus, by using a readily available and commercially available flexible product like the O-ring, reliable centering guidance can be achieved while reducing manufacturing costs.

[0015] According to one alternative embodiment, the fastener is constructed as a screw, and the receiving portion is constructed as a threaded hole adapted to mate with the screw. Thus, the assembly accuracy of the motor housing components is improved by using a positioning element, ensuring the stability of the motor's operation even with the use of a common mechanical connection method like screws, while simultaneously reducing manufacturing and maintenance costs.

[0016] According to one alternative embodiment, in the assembled state of the motor, the outer periphery, inner periphery, upper side, and lower side of the positioning member are all compressed. This multi-faceted compression ensures that the positioning member functions in all directions. The compression of the outer periphery ensures a tight fit between the positioning member and the inner wall of the opening, providing stable radial positioning; the compression of the inner periphery ensures reliable contact with the fastener, enhancing the anti-loosening effect; the compression on the upper side originates from the fastener head, providing axial preload; and the compression on the lower side originates from the second housing component, forming a complete force transmission path. Simultaneously, this design also provides better vibration damping because vibration energy can be dissipated through multiple contact surfaces. For motor applications requiring long-term operation in vibrating environments, this design significantly improves product durability.

[0017] According to an optional embodiment, the opening is constructed as a circular hole with a first outer diameter d1, the receiving portion has a second outer diameter d2, and the O-ring, in its uncompressed state, has an inner diameter ID, an outer diameter OD, and a wire diameter CS, wherein the following dimensional relationships are satisfied: ID < d2 < d1 < OD, and d1 - d2 < 2CS. This ensures that the positioning element functions correctly. ID less than d2 ensures that the O-ring can be reliably fixed to the screw and will not fall off during assembly; d2 less than d1 ensures sufficient alignment adjustment space during assembly; d1 less than OD ensures that the O-ring can form an interference fit with the opening, achieving a guiding function; the relationship d1 - d2 < 2CS ensures that the O-ring can still fill the gap between the opening and the screw after compression, providing reliable positioning and anti-loosening functions.

[0018] According to an optional embodiment, the first housing component is constructed as an end cap with a thickness d0, wherein the following dimensional relationship is satisfied: d0 < CS. This ensures that the O-ring maintains a certain amount of protrusion when installed within the opening of the first housing component. This protrusion ensures that the O-ring remains axially compressed in the final assembled state, thereby providing reliable positioning and anti-loosening functions.

[0019] According to an alternative embodiment, the second housing member has a peripheral wall defining the receiving space and a protruding edge extending from the peripheral wall in a direction opposite to the axis of rotation, the receiving portion being configured as a threaded through hole located at the protruding edge. Thus, the protruding edge design not only enhances the structural strength of the housing but also provides sufficient installation space for the threaded connection.

[0020] According to an alternative embodiment, the screw has a third central axis that, in the assembled state of the motor, coincides with the first and second central axes. This triaxial coincidence design ensures precise fit between the components, reducing the possibility of gaps and misalignments.

[0021] In one alternative embodiment, the rotor is fixed to the peripheral wall. Thus, the peripheral wall serves as the rotor's mounting reference, and its positional accuracy directly determines the uniformity of the air gap between the rotor and the stator. By improving the assembly accuracy of the housing components, the rotor's mounting accuracy is indirectly improved, thereby optimizing motor performance.

[0022] According to an optional embodiment, the fastener has a screw head, and in the assembled state of the motor, the upper side of the positioning member is interference-fitted with the lower side of the screw head, and the lower side of the positioning member is interference-fitted with the upper side of the second housing member. Thus, the interference fit on the upper side ensures reliable contact pressure between the screw head and the positioning member, which prevents the screw from loosening under vibration. The interference fit on the lower side ensures stable contact between the positioning member and the second housing member, forming a reliable force transmission interface. This bidirectional interference design keeps the positioning member in a compressed state axially, fully utilizing the energy storage characteristics of the elastic material. The stored elastic energy is converted into a continuous clamping force, which maintains the stability of the connection even if slight loosening occurs in the threaded connection after long-term use.

[0023] According to an alternative embodiment, the rotor is disposed within the receiving space and fixedly connected to the first housing member or the second housing member to form a rotor assembly that rotates relative to the stator about the rotation axis. This design integrates the rotor and associated housing members into a single functional module, simplifying the overall structure of the motor. The positioning element design of this application ensures the assembly accuracy of the rotor assembly, thereby guaranteeing its motion accuracy relative to the stator assembly.

[0024] According to an optional embodiment, the motor further includes a shaft extending along the rotation axis, the shaft being fixedly connected to the stator to form a stator assembly. Thus, the shaft serves as the central support of the stator assembly, providing a stable geometric reference for the entire motor. The assembly technology of this application ensures the relative positional accuracy between the stator assembly and the rotor assembly, thereby optimizing motor performance.

[0025] According to an alternative embodiment, the first housing member and the second housing member each have through holes for the shaft to pass through. Thus, the through holes provide support and positioning for the shaft, while allowing the shaft to extend outside the motor for easy attachment to household appliances.

[0026] According to one alternative embodiment, the fastener is configured to have the positioning element pre-assembled before the motor is assembled. Thus, the pre-assembled positioning element serves as part of the fastener, simplifying the motor assembly process and reducing the number of steps and the possibility of errors during assembly.

[0027] According to one alternative embodiment, a corresponding opening, a receiving portion, a fastener, and a positioning element constitute a fastening assembly, and the motor includes multiple fastening assemblies evenly distributed with reference to the rotation axis. This evenly distributed design of multiple fastening assemblies achieves uniform load distribution and structural symmetry. Uniform distribution means that each fastening point bears essentially the same load, avoiding failure caused by localized overload. This design also ensures uniform clamping between housing components, preventing the formation of localized gaps. For rotating machinery, symmetrically distributed fastening points help maintain dynamic balance and reduce vibration.

[0028] According to one alternative embodiment, the positioning element is pre-assembled in the end region of the fastener. This design, where the positioning element is pre-assembled in the end region of the fastener, optimizes the guiding effect during assembly. The end position allows the positioning element to guide the fastener as soon as it enters the opening, and subsequently guides and positions it as it moves along the fastener, thus ensuring accurate alignment.

[0029] According to one alternative embodiment, multiple fastening groups are distributed in the peripheral area of ​​the motor. This peripheral distribution allows the fastening force to be applied evenly to the edges of the housing, forming a stable constraint.

[0030] According to a second aspect of this application, a household appliance is provided, which has a motor for a household appliance as provided in the embodiments of the first aspect above. Thus, this household appliance particularly possesses the advantages mentioned in the embodiments above.

[0031] According to one optional embodiment, the household appliance is configured as a range hood, and the motor is arranged to drive the impeller of the range hood's fan to rotate. Therefore, since the high-speed rotation of the range hood's fan impeller places high demands on the motor's dynamic balance, ensuring proper alignment of the motor's housing components can reduce imbalance and improve operational stability. Attached Figure Description

[0032] The principles, features, and advantages of this application will be better understood below with reference to the accompanying drawings. The drawings include: Figure 1 An exploded view of a household appliance configured as a range hood according to an exemplary embodiment of this application is shown; Figure 2 A side view of a motor used in household appliances is shown; Figure 3 It shows from Figure 2 A top view of the motor observed from line of sight A; Figure 4 It shows along Figure 3 A cross-sectional view cut by the cutting line BB; Figure 5 It shows Figure 4 The motor components in the motor, wherein fasteners have secured the first housing component and the second housing component together; Figure 6 It shows Figure 5 The enlarged view of part C shown; Figure 7 It shows Figure 6 The enlarged view of part D shown; Figure 8 It shows Figure 4 In the motor components, fasteners fail to secure the first housing component and the second housing component together; Figure 9 It shows Figure 8 The enlarged view of E shown; and Figure 10 Another exemplary embodiment of the present application is shown. Figure 9 A similar magnified view of a specific area.

[0033] Figure label: 2000: Household appliance; 2003: Bracket; 2002: Volute; 2001: Impeller; 1000: Motor; 900: Stator; 800: Rotor; 700: Shaft; 100: First housing component; 200: Second housing component; 300: Fastener; 400: Positioning component; 1002: Accommodating space; 1001: Rotation axis; 310: Screw head; 210: Receiving part; 202: Protruding edge; 201: Peripheral wall; 110: Opening; 11: Through hole; 10: First central axis; 20: Second central axis; 30: Third central axis. Detailed Implementation

[0034] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit the scope of protection of this application. Various embodiments may share the same view or multiple views for description, but not all features appearing in the same view should be interpreted as features that must be present in an embodiment.

[0035] For ease of understanding, the description provided in the background section of this application may be recalled. One object of this application is to provide a motor for a household appliance, the motor comprising: a stator; a rotor configured to rotate relative to the stator about a rotation axis; a first housing member and a second housing member; and a fastener configured to fasten the first housing member and the second housing member relative to each other in a mating posture to form a receiving space that at least partially accommodates the stator, wherein the first housing member has an opening configured to allow the fastener to pass through, and the second housing member has a receiving portion configured to accommodate the fastener; and a positioning member at least partially located within the opening and at least partially surrounding the fastener in the assembled state of the motor, the positioning member being configured to guide the fastener during assembly to position the first housing member and the second housing member relative to each other in a mating posture. Thus, during assembly, the positioning member is at least partially located within the opening of the first housing member and at least partially surrounds the fastener, forming a guiding mechanism. When an operator or equipment inserts the fastener, the positioning member can automatically guide the fastener to the correct installation path, ensuring that the first housing member and the second housing member are fastened to each other in an accurate mating posture. This design significantly reduces assembly difficulty, improves production efficiency, and reduces product scrap rates caused by misalignment. More importantly, proper alignment ensures uniform air gap between the stator and rotor, thereby reducing motor operating noise and improving motor performance.

[0036] Exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0037] Figure 1 An exploded view of a household appliance 2000 configured as a range hood according to an exemplary embodiment of this application is shown.

[0038] like Figure 1 As illustrated schematically, the household appliance 2000 can be implemented as a range hood. The core function of a range hood is to quickly remove cooking fumes generated during cooking by creating negative pressure through a fan. Here, the household appliance 2000 has a motor 1000 as its power source. The motor 1000 is preferably an external rotor motor. In embodiments not shown in the accompanying drawings, the household appliance 2000 can also be implemented as other household appliances with the motor 1000 as its power source, such as an electric fan, vacuum cleaner, air purifier, etc., and the motor 1000 can also be other types of motors, such as an internal rotor motor, etc. Figure 1As can be seen, the fan of the range hood may include a motor 1000, which will be described in detail below, and an impeller 2001 driven by the motor 1000. The rotor 800 of the motor 1000 may be fixedly connected to the impeller 2001. The fan of the range hood may also include a volute 2002. The volute 2002 is used to guide the airflow generated by the rotating impeller 2001. In addition, the fan of the range hood may also include a bracket 2003. The shaft 700 of the motor 1000 may be fixedly connected to the volute 2002, for example, via the bracket 2003.

[0039] Figure 2 A side view of a motor 1000 for a household appliance 2000 is shown. Figure 3 It shows from Figure 2 A top view of motor 1000 observed from viewpoint A; Figure 4 It shows along Figure 3 The cross-sectional view cut by the cutting line BB.

[0040] like Figure 4 Combination Figure 2 and Figure 3As shown, the motor 1000 includes a stator 900 and a rotor 800. The stator 900 is typically made of laminated silicon steel sheets with coils wound around it and remains stationary when the motor 1000 is operating. The rotor 800 typically has permanent magnets fixed to it, and is configured to rotate relative to the stator 900 about a central axis of rotation 1001. To construct the basic framework of the motor 1000 and protect the internal components, the motor 1000 has a first housing part 100 and a second housing part 200. The first housing part 100 is, for example, the upper end cover of the motor 1000, and the second housing part 200 is, for example, the main housing of the motor 1000. Both housing parts are preferably stamped from sheet metal (such as stainless steel) and fastened to each other by at least one fastener 300 to form a mating posture. The two housings together enclose a receiving space 1002, within which most of the structure of the stator 900 and the rotor 800 is located. One or more openings 110 are provided on the first housing member 100, sized to allow the fastener 300 to pass through smoothly. Correspondingly, a receiving portion 210 corresponding to the location of the opening 110 is provided on the second housing member 200. In the embodiment shown in the figures, the receiving portion 210 is configured as a through hole. In an embodiment not shown, the receiving portion 210 may also be configured as a blind hole. When the fastener 300 is configured as a screw, the receiving portion 210 may be configured as a threaded hole adapted to mate with the screw for engagement of the fastener 300. To guide the fastener 300 in correct positioning during the assembly of the motor 1000, the motor 1000 also includes a positioning member 400. In the final assembled state of the motor 1000, the positioning member 400 is positioned at least partially within the opening 110 of the first housing member 1000 and at least partially surrounds the fastener 300 in the radial direction with reference to the axis of rotation 1001. The positioning component 400 is mainly used to actively guide the movement trajectory of the fastener 300 during the assembly process of the motor 1000, and uses its own physical characteristics to help adjust the relative position of the first housing component 100 and the second housing component 200, so as to ensure that they can accurately reach the preset mating posture, thereby achieving high-precision centering.

[0041] like Figure 3 Combination Figure 2 As shown, in the motor 1000, an opening 110, a corresponding receiving portion 210, a fastener 300, and a positioning element 400 together constitute a fastening assembly. To achieve stable and uniform fixing and positioning, the motor 1000 may include more than one fastening assembly, such as four, six, or eight. The arrangement of these fastening assemblies can be uniformly distributed with reference to the rotation axis 1001. For example, for... Figure 3The four fastening groups shown are distributed at 90-degree intervals around the rotation axis 1001 on the circumference. This ensures that the clamping force is evenly applied to the entire contact surface of the housing when tightening all the fasteners, avoiding warping or deformation of the housing due to uneven force.

[0042] Figure 5 It shows Figure 4 The motor 1000 has some components, wherein fasteners 300 have fastened the first housing 100 and the second housing 200 to each other; Figure 6 It shows Figure 5 The enlarged view of part C shown; Figure 7 It shows Figure 6 The enlarged view of part D shown; Figure 8 It shows Figure 4 In the motor 1000, some components are not fastened together by fasteners 300, wherein the first housing 100 and the second housing 200 are not fastened together by fasteners 300. Figure 9 It shows Figure 8 The enlarged view of part E shown.

[0043] like Figure 9 Combination Figure 8 As shown, the opening 110 on the first housing member 100 is designed as a through hole with a defined geometric center, its central axis defined as the first central axis 10. Similarly, the receiving portion 210 (such as a threaded hole) on the second housing member 200 also has a defined central axis, defined as the second central axis 20. In an ideal mating configuration, the first central axis 10 and the second central axis 20 are completely coincident in space, and preferably both are parallel to the axis of rotation 1001. Figure 9It can also be seen that the fastener 300, which acts as a screw, also has a geometric central axis, defined as the third central axis 30. In the assembled state of the motor 1000, the third central axis 30 is completely coincident with the first central axis 10 of the opening 110 and the second central axis 20 of the receiving portion 210. In the prior art, which lacks a positioning element 400, achieving this coincidence relies primarily on high-precision tooling fixtures and skilled workers, resulting in high costs and low reliability. The positioning element 400 plays a crucial calibration role during assembly. In a preferred embodiment, the positioning element 400 is constructed as an elastomer made of an elastic material. Thus, during the alignment stage of assembly, the elasticity of the material allows the positioning element 400 to generate a stable, non-destructive restoring force when subjected to lateral compression from the inner wall of the opening 110, thereby gently pushing the housing part to achieve alignment without causing jamming or scratching as with rigid materials. During the motor operation phase after fastening, the elasticity of the material allows the compressed positioning element 400 to store elastic energy, continuously applying pressure to the fastener 300 like a spring. This provides axial preload to prevent loosening, and also absorbs and buffers the high-frequency vibrations generated during motor operation and reduces noise.

[0044] like Figure 7 As schematically shown, after the motor 1000 is assembled, the positioning member 400 completely surrounds the fastener 300 in the circumferential direction, and the positioning member 400 is at least partially compressed. Specifically, the outer periphery, inner periphery, upper side, and lower side of the positioning member 400 are all compressed. Figure 7It can also be seen that the fastener 300 has a screw head 310, the upper side of the positioning member 400 is in interference fit (or press fit) with the lower side of the screw head 310, and the lower side of the positioning member 400 is in interference fit (or press fit) with the upper side of the second housing member 200. Herein, the fastener 300 may be configured as an M4, M5, M6 or M8 screw. Taking a standard M6 screw (nominal diameter: 6 mm; pitch: 1 mm; cylindrical head diameter: 10 mm) as an example, after the motor is assembled, the interference amount (or the compression amount of the positioning member 400) between the upper side of the positioning member 400 and the lower side of the screw head 310, and the interference amount (or the compression amount of the positioning member 400) between the lower side of the positioning member 400 and the upper side of the second housing member 200 may each be in a range between 0.1 mm and 0.2 mm. The positioning member 400 is preferably configured as an O-ring made of rubber material, such O-ring is made of polyurethane rubber for example, has an elastic modulus of 5 to 20 MPa for example, and a compression rate between 5% and 20% for example. The opening 110 is configured as a circular hole having a first outer diameter d1, the first outer diameter d1 is 9.4 mm for example, the receiving portion 210 has a second outer diameter d2 that fits with the fastener 300 configured as a screw, the O-ring has an inner diameter ID, an outer diameter OD and a wire diameter CS in an uncompressed state, wherein the inner diameter ID is 5.8 mm for example, the outer diameter OD is 9.6 mm for example, the wire diameter CS is 1.9 mm for example, wherein: ID < d2 < d1 < OD, and d1 - d2 < 2CS. Therefore, the interference amount (or the compression amount of the positioning member 400) between the inner side of the O-ring and the fastener 300, and the interference amount (or the compression amount of the positioning member 400) between the outer side of the O-ring and the inner wall of the opening 110 may each be in a range between 0.1 mm and 0.2 mm. Specifically, ID < d2, that is, the inner diameter of the O-ring is smaller than the thread outer diameter of the screw, which ensures that when the O-ring is pre-assembled onto the screw, it can generate interference fit by virtue of its own elasticity and tightly clamp on the screw rod, and will not slip off easily during transportation or assembly; d2 < d1, that is, the diameter of the screw is smaller than the diameter of the opening, which provides a necessary annular gap therebetween; d1 < OD, that is, the diameter of the opening 110 is smaller than the outer diameter of the O-ring, so that during assembly, the outer wall of the O-ring can be compressed inward by the edge of the opening 110 to generate a radial force, thereby achieving centering; d1 - d2 < 2CS, which ensures that the O-ring can be effectively accommodated.When the first housing 100 is constructed as an end cap with a thickness d0, d0 < CS, meaning the thickness of the end cap is less than the wire diameter (i.e., thickness) of the O-ring in its free state, even when the O-ring is pressed into the opening 110, it still partially protrudes from the surface of the end cap in the axial direction. Therefore, when the screw head is finally tightened, it not only presses on the end cap but, more importantly, on this protruding part of the O-ring, keeping the O-ring in a state of axial compression. This continuously applies an upward elastic reaction force to the screw head. This reaction force is the preload force that prevents the screw from loosening during vibration.

[0045] like Figure 8 As shown, the second housing member 200 has a generally cylindrical peripheral wall 201, which forms the main boundary of the receiving space 1002. The rotor 800 is disposed within this receiving space 1002 and preferably fixed to the peripheral wall 201 for fixed connection with the second housing member 200 and subsequently with the first housing member 100, thereby forming a rotor assembly that rotates about the axis of rotation 1001 relative to the stator 900. For ease of installation and connection, a (preferably integrally annular) protrusion 202 extends from the upper edge of the peripheral wall 201 in a direction away from the axis of rotation 1001 (i.e., radially outward). The protrusion 202 provides a flat mounting base. The receiving portion 210 is specifically configured as a threaded through-hole located on the protrusion 202. That is, a screw 300 passes through the opening 110 of the first housing member 100 and then through the threaded through-hole on the protrusion 202, thereby securing the upper end cap to this protrusion. Figure 4 The motor 1000 also includes a central shaft 700 extending along the rotation axis 1001. The shaft 700 is fixedly connected to the stator 900 (e.g., including a stator core and coils), and together they form a stator assembly that remains stationary during operation of the motor 1000. For the shaft 700 to pass through, the first housing member 100 and the second housing member 200 each have a central through hole 11.

[0046] Figure 10 Another exemplary embodiment of the present application is shown. Figure 9 A similar magnified view of a specific area.

[0047] exist Figure 9 In the illustrated embodiment, before the motor 1000 is assembled, the fastener 300 is pre-assembled with a positioning element 400, which can be pre-assembled in the end region of the fastener 300 as shown. Figure 10 In another embodiment shown, the positioning element 400 may be pre-assembled into the opening 110 of the first housing 100 before the motor 1000 is assembled. Within the scope of this application, the assembled state should be understood as the assembly process in which the first housing 100, the second housing 200, the fastener 300, and the positioning element 400 have been assembled together (as well as...). Figures 4 to 7 As shown); the pre-assembled state should be understood as the provision of pre-assembled components (such as the first housing 100, the second housing 200, and the fasteners 300 pre-assembled with the positioning element 400, or the first housing 100, the second housing 200, and the fasteners 300 pre-assembled with the positioning element 400), but the motor 1000 is not yet fully assembled (as shown). Figure 9 and Figure 10 (As shown); the mating posture should be understood as the first housing member 100 and the second housing member 200 being in the correct installation position relative to each other, preferably accurately aligned within the scope of this application.

[0048] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this application, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this application are intended to be illustrative and not limiting, unless explicitly stated otherwise. In practice, multiple features may be combined with each other as needed and where technically feasible. Various substitutions, modifications, and alterations are also conceived without departing from the spirit and scope of this application.

Claims

1. A motor for use in household appliances, characterized in that, The motor (1000) includes: Stator (900); The rotor (800) is configured to rotate about a rotation axis (1001) relative to the stator (900); A first housing member (100) and a second housing member (200) and a fastener (300), the fastener (300) being configured to fasten the first housing member (100) and the second housing member (200) relative to each other in a mating posture to form a receiving space (1002) that at least partially accommodates the stator (900), wherein the first housing member (100) has an opening (110) configured to allow the fastener (300) to pass through, and the second housing member (200) has a receiving portion (210) configured to accommodate the fastener (300); and In the assembled state of the motor (1000), a positioning element (400) is at least partially located within the opening (110) and at least partially surrounds the fastener (300), the positioning element (400) being configured to guide the fastener (300) during assembly to position the first housing part (100) and the second housing part (200) relative to each other in a mating posture.

2. The motor for household appliances according to claim 1, characterized in that, The opening (110) has a first central axis (10), and the receiving portion (210) has a second central axis (20). In the mating posture of the first housing member (100) and the second housing member (200), the first central axis (10) coincides with the second central axis (20); and / or The positioning element (400) is configured to allow the fastener (300) to move relative to the positioning element (400) during assembly.

3. The motor for household appliances according to claim 2, characterized in that, In the assembled state of the motor (1000), the first central axis (10) and the second central axis (20) are parallel to the rotation axis (1001); and / or The positioning element (400) is constructed as an elastomer made of an elastic material.

4. The motor for household appliances according to any one of claims 1 to 3, characterized in that, In the assembled state of the motor (1000), the positioning member (400) completely surrounds the fastener (300); and / or The motor (1000) is configured as an external rotor motor; and / or The first housing part (100) and the second housing part (200) are stamped parts made of sheet metal.

5. The motor for household appliances according to claim 3, characterized in that, In the assembled state of the motor (1000), the positioning member (400) is at least partially in a compressed state; and / or The positioning element (400) is constructed as an O-ring made of rubber material; and / or The fastener (300) is constructed as a screw, and the receiving portion (210) is constructed as a threaded hole adapted to mate with the screw.

6. The motor for household appliances according to claim 5, characterized in that, In the assembled state of the motor (1000), the outer periphery, inner periphery, upper side, and lower side of the positioning member (400) are all compressed; and / or The opening (110) is constructed as a circular hole with a first outer diameter d1, the receiving part (210) has a second outer diameter d2, and the O-ring has an inner diameter ID, an outer diameter OD and a wire diameter CS in the uncompressed state, wherein the following dimensional relationship is satisfied: ID < d2 < d1 < OD, and d1 - d2 < 2CS.

7. The motor for household appliances according to claim 6, characterized in that, The first housing part (100) is constructed as an end cap with a thickness d0, wherein the following dimensional relationship is satisfied: d0 < CS.

8. The motor for household appliances according to claim 5, characterized in that, The second housing member (200) has a peripheral wall (201) defining the receiving space (1002) and a protruding edge (202) extending from the peripheral wall (201) in a direction away from the axis of rotation (1001), the receiving portion (210) being configured as a threaded through hole located at the protruding edge (202); and / or The screw has a third central axis (30), which coincides with the first central axis (10) and the second central axis (20) in the assembled state of the motor (1000).

9. The motor for household appliances according to claim 8, characterized in that, The rotor (800) is fixed to the peripheral wall (201); and / or The fastener (300) has a screw head (310). In the assembled state of the motor (1000), the upper side of the positioning member (400) is interference-fitted with the lower side of the screw head (310), and the lower side of the positioning member (400) is interference-fitted with the upper side of the second housing member (200).

10. A motor for a household appliance according to any one of claims 1 to 3, characterized in that, The rotor (800) is disposed within the receiving space (1002) and fixedly connected to the first housing member (100) or the second housing member (200) to form a rotor assembly that rotates about the rotation axis (1001) relative to the stator (900); and / or The motor (1000) also includes a shaft (700) extending along the rotation axis (1001), the shaft (700) being fixedly connected to the stator (900) to form a stator assembly.

11. The motor for household appliances according to claim 10, characterized in that, The first housing component (100) and the second housing component (200) each have a through hole (11) through which the shaft (700) passes.

12. A motor for a household appliance according to any one of claims 1 to 3, characterized in that, The fastener (300) is configured to be pre-assembled with the positioning element (400) before the motor (1000) is assembled; and / or A fastening assembly is formed by a corresponding opening (110), a receiving part (210), a fastener (300), and a positioning part (400), and the motor (1000) includes a plurality of fastening assemblies evenly distributed with reference to the rotation axis (1001).

13. The motor for household appliances according to claim 12, characterized in that, The positioning element (400) is pre-assembled in the end region of the fastener (300); and / or Multiple fasteners are distributed in the surrounding area of ​​the motor (1000).

14. A household appliance, characterized in that, The household appliance (2000) has a motor for a household appliance according to any one of claims 1 to 13.

15. The household appliance according to claim 14, characterized in that, The household appliance (2000) is configured as a range hood, and the motor (1000) is arranged to drive the impeller (2001) of the fan of the range hood to rotate.

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